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Diversity of parasites in wild Astronotus ocellatus (Perciformes, Cichlidae), an ornamental and food fish in Brazil
Provedor de dados: 42
Autores: TAVARES-DIAS,MARCOS; NEVES,LIGIA R.
ABSTRACT The community composition of parasites was characterized in Astronotus ocellatus from a tributary of the Amazon River, northern Brazil. The prevalence was 87.9%, and a total of 526,052 parasites were collected, with a mean of 15,941 parasites per host. Nine taxa of ecto- and endo-parasites were identified, but Ichthyophthirius multifiliis was the dominant species, while Piscinoodinium pillulare, Clinostomum marginatum and Argulus multicolor were the least prevalent parasites. The parasite community was characterized by a low species richness, low diversity and low evenness. Host body size was not found to influence the composition of the parasite community, and there was no significant correlation between abundance of any parasite species and host...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregation; Amazon; Ectoparasites; Endoparasites; Freshwater fish.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502305

Voltammetric characteristics of miconazole and its cathodic stripping voltammetric determination
Provedor de dados: 42
Autores: PEREIRA,FRANCISCO C.; STRADIOTTO,NELSON R.; ZANONI,MARIA VALNICE B.
Miconazole is reduced at mercury electrode above pH 6 involving organometallic compound formation, responsible for an anomalous polarographic behavior. The electrodic process presents a large contribution of the adsorption effects. The drug can be determined by cathodic stripping voltammetry from 8.0 x 10-8 to 1, 5 x 10-6 molL-1 in Britton-Robinson buffer pH 8.0, when pre-accumulated for 30s at an accumulation potential of 0V. A relative standard deviation of 3.8% was obtained for ten measurements of 1.0 x 10-7 molL-1 miconazole in B-R buffer pH 8.0 and a limit detection of 1, 7 x 10-8 molL-1 was determined using 60s of deposition time and scan rate of 100 mVs-1. The proposed method is simple, precise and it was applied successfully for the determination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miconazole; Voltammetry; Electroanalysis; Determination.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300005

Permineralized conifer-like leaves from the Jurassic of Patagonia (Argentina) and its paleoenvironmental implications
Provedor de dados: 42
Autores: FUEYO,GEORGINA M. DEL; GNAEDINGER,SILVIA C.; DIAZ,MAITEN A. LAFUENTE; CARRIZO,MARTÍN A.
Abstract Abstract: Anatomically preserved conifer-like leaves from the Middle Jurassic La Matilde Formation at the Barda Blanca locality in the Gran Bajo de San Julián area, southern Patagonia are described here. Leaves are assigned to conifers based on the following foliar features: thick-walled epidermal cells, a sclerenchymatic hypodermis, resin canals and transfusion tracheids associated with the vascular bundle. General mesophyll anatomy and inferred foliar morphology suggest a similarity to large, broad, linear-lanceolate, multi-veined conifer-like leaves. The general foliar habit indicates an affinity with the large, multi-veined leaves of the Araucariaceae; especially with those exhibited by the species of the Araucaria sections, Araucaria and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conifers; Jurassic; La Matilde Formation; Leaves; Patagonia; Permineralized.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400510

Genotoxic and Genoprotective Potential of Black Mulberry (Morus nigra) Fruit
Provedor de dados: 42
Autores: YILMAZ,SERKAN; UÇAR,ASLI; GÖKTAŞ,BAYRAM.
Abstract: Black Mulberry (Morus nigra L.) belongs to Moraceae family. The present study evaluated the possible genotoxic and/or protective activities of black mulberry fruit juice (BMFJ), in vitro, using mitomycin C (MMC) as a positive control, by chromosomal aberrations and micronucleus assays. Human lymphocytes were treated with BMFJ concentrations alone (1/1, 1/2, 1/4, 1/8 dilutions), pretreatment (49h) (0.20 μg/ml MMC+ 1/1 BMFJ, 0.20 μg/ml MMC+1/2 diluted BMFJ, 0.20 μg/ml MMC+1/4 diluted BMFJ, 0.20 μg/ml MMC+1/8 diluted BMFJ) and simultaneous-treatment (48h) (0.20 μg/ml MMC+ 1/1 BMFJ, 0.20 μg/ml MMC+1/2 diluted BMFJ, 0.20 μg/ml MMC+1/4 diluted BMFJ, 0.20 μg/ml MMC+1/8 diluted BMFJ). The in vitro results demonstrated that BMFJ showed no genotoxicity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Black mulberry; Chromosomal aberrations; Micronucleus; Genotoxicity; Anti-genotoxicity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700602

Swelling and shrinking of porous materials: from colloid science to poromechanics
Provedor de dados: 42
Autores: Murad,Marcio A.
Tipo: Info:eu-repo/semantics/article
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100001

Symmetry breakdown and coupling constants of leptons
Provedor de dados: 42
Autores: Marques,Gil C.; Spehler,Dominique.
Based on a new approach to symmetries of the fundamental interactions we deal, in this paper, with the electroweak interactions of leptons. We show that the coupling constants, arising in the way leptons are coupled to intermediate bosons, can be understood as parameters associated to the breakdown of SU(2) and parity symmetries. The breakdown of both symmetries is characterized by a new parameter (the asymetry parameter) of the electroweak interactions. This parameter gives a measure of the strength of breakdown of symmetries. We analyse the behaviour of the theory for three values of this parameter. The most relevant value is the one for which only the electromagnetic interactions do not break parity (the maximally allowed left-right asymetric theory)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symmetries; Coupling constants; Eletroweak interactions.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200002

A new age to an old site: the earliest Tupiguarani settlement in Rio de Janeiro State?
Provedor de dados: 42
Autores: Scheel-Ybert,Rita; Macario,Kita; Buarque,Angela; Anjos,Roberto M.; Beauclair,Mariana.
This paper presents unexpectedly early dates for a Tupiguarani settlement in Southeastern Brazil. One radiocarbon dating of 1740 ± 90 yr BP (1820-1390 cal yr BP) was already available for the Morro Grande site (Araruama, southeastern coast of Rio de Janeiro State). Two new dates, obtained from charcoal samples, are reported here. An age of 2920 ± 70 yr BP (3220-2790 cal yr BP) was obtained from a specialized hearth, probably used for cooking ceramics; a funerary hearth at the same archaeological locus was dated at 2600 ± 160 yr BP (3000-2150 cal yr BP). Both measurements were made independently, indifferent laboratories, arguing for their validity. These results considerably age the arrival time of Tupiguarani populations to the coastal region of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiocarbon dating; Prehistoric occupation; Archaeology; Tupiguarani; Brazil.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400015

Flags of holomorphic foliations
Provedor de dados: 42
Autores: Mol,Rogério S.
A flag of holomorphic foliations on a complex manifold M is an object consisting of a finite number of singular holomorphic foliations on M of growing dimensions such that the tangent sheaf of a fixed foliation is a subsheaf of the tangent sheaf of any of the foliations of higher dimension. We study some basic properties oft hese objects and, in &lt;img src="/img/revistas/aabc/2011nahead/aop2411pcn.jpg" align="absmiddle" /&gt;, n &gt; 3, we establish some necessary conditions for a foliation, we find bounds of lower dimension to leave invariant foliations of codimension one. Finally, still in &lt;img src="/img/revistas/aabc/2011nahead/aop2411pcn.jpg" align="absmiddle" /&gt; involving the degrees of polar classes of foliations in a flag.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic foliations; Polar varieties; Invariant varieties.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300003

The impact of long-term consumption of diets enriched with olive, cottonseed or sesame oils on kidney morphology: A stereological study
Provedor de dados: 42
Autores: HASSANZADEH-TAHERI,MOHAMMADMEHDI; HASSANZADEH-TAHERI,MAHSA; JAHANI,FARNAZ; ERFANIAN,ZAHRA; MOODI,HESAM; HOSSEINI,MEHRAN.
Abstract: To date, most of studies have only focused on metabolic effects of dietary oils while recent evidence proposes that they can influence kidneys structure. Therefore, the aim of this study was to evaluate the impact of long-term consumption of olive, cottonseed and sesame oils on renal morphology in rats. 70 male Wistar rats randomly assigned into seven equal groups and treated with standard diet (control), the standard diet enriched with 10% or 20% (W/W) of either olive oil (OLI10%, OLI20%), cottonseed oil (COT10%, COT20%) or sesame oil (SES10%, SES20%) for 5 months. Quantitative features of the kidney including kidney and cortex volumes and the number of glomeruli were analyzed stereologically. Moreover, kidney sections histologically were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cottonseed oil; Histopathology; Kidney; Olive oil; Sesame oil; Stereology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300702

Germination of Styrax camporum Pohl. seeds in response to substrate types, moisture contents and the seed morphology
Provedor de dados: 42
Autores: Simão,Edson; Nakamura,Adriana T.; Takaki,Massanori.
This study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerradão and a riparian forest), different water potentials (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa), light and temperature to seed germination. Seed size did not affect the germination percentage when seeds were sown on vermiculite. Seeds were affected by small variations in the moisture content of the tested substrates, showing a significant decrease in germination under water potentials lower than -0.1 MPa, close to the field capacity of cerrado s. str. soils. At the temperatures of 15 and 20°C, a significant decrease in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Water stress; Morphophysiology; Styracaceae; Vermiculite.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100295

Re-induction of desiccation tolerance after germination of Cedrela fissilis Vell. seeds
Provedor de dados: 42
Autores: MASETTO,TATHIANA E.; FARIA,JOSE M.; FRAIZ,ANA C.R.
This work aimed to characterize the re-induction of desiccation tolerance (DT) in germinated seeds, using polyethylene glycol (PEG 8000). Cell changes were investigated through cytological assays (cell viability and transmission electronic microscopy) as well as DNA integrity during loss and re-establishment of DT. The loss of DT was characterized by drying germinated seeds with different radicle lengths (1, 2, 3, 4 and 5 mm) in silica gel, decreasing the moisture content to ten percentage points intervals, followed by pre-humidification (100% RH / 24 h) and rehydration. To re-induce DT, germinated seeds were treated for 72 h with PEG (-2.04 MPa) and PEG (-2.04 MPa) + ABA (100 µM) before dehydration. Germinated seeds did not tolerate desiccation to 10%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytological alterations; DNA integrity; Seedlings; Moisture content.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301273

Alterations in the Transcriptional Profile of the Liver Tissue and the Therapeutic Effects of Propolis Extracts in Alcohol-induced Steatosis in Rats
Provedor de dados: 42
Autores: YE,MANHONG; XU,MENGTING; JI,CHAO; JI,JIAN; JI,FUBIAO; WEI,WANHONG; YANG,SHENGMEI; ZHOU,BIN.
Abstract Abstract: The hepatoprotective effects of the ethanolic extracts of propolis (EEP) on alcohol-induced liver steatosis were investigated in Wistar rats. Chronic alcoholic fatty liver was induced by administration of 52% alcohol to male Wistar rats at the dose of 1% body weight for 7 weeks. Then animals were simultaneously treated with 50% ethanol solutions of EEP or normal saline at the dose of 0.1% body weight for 4 further weeks. Serological analyses and liver histopathology studies were performed to investigate the development of steatosis. Microarray analysis was conducted to investigate the alterations of hepatic gene expression profiling. Our results showed that 4-week treatment of EEP helped to restore the levels of various blood indices,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acid oxidation; Hepatoprotective effects; Lipogenesis; Propolis extracts; Steatosis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500610

Strategies that facilitate or counter eavesdropping on vocal interactions in songbirds
Provedor de dados: 42
Autores: Dabelsteen,Torben.
Most territorial songbirds live in communication networks where eavesdropping on vocal interactions may constitute an important option for gathering information regarding the relative dominance, condition and quality of individuals being eavesdropped upon. The relatively low costs and risks of eavesdropping, together with the obvious advantages of gaining such comparative information about other individuals, predict eavesdropping to be a widespread phenomenon even though it is not necessarily advantageous for the participants to be eavesdropped upon. Special eavesdropper strategies that facilitate eavesdropping (how best to eavesdrop) may therefore have evolved together with strategies for interacting that either co-facilitate (public signaling) or counter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Communication networks; Eavesdropping strategies; Vocal interactions.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200014

Relationship between biochemical and photosynthetic traits with Asian soybean rust
Provedor de dados: 42
Autores: OLIVEIRA,TÁSSIA B. DE; PEIXOTO,LEONARDO A.; TEODORO,PAULO E.; ALVARENGA,AMAURI A. DE; BHERING,LEONARDO L.; HOFFMANN-CAMPO,CLARA B.
Abstract Asian soybean rust (Phakopsora pachyrhizi – ASR) is one of the major diseases that occur in soybean and causes great damage to commercial crops. Therefore, the goal of this work was to investigate the relationship between biochemical and photosyntetic parameters in soybean with ASR. Two experiments were performed in a randomized complete block with three treatments (water, Tween 20, and methyl jasmonate). The evaluated traits were: severity, chlorophyll pools, concentration of phenolic compounds content, enzyme activity, and photosyntetic parameters. Based on Pearson correlation, correlation network and path analysis it was verified that the severity had high correlation with almost all traits evaluated meanwhile photosynthesis is weakly related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlation network; Glycine max; Path analysis; Phakopsora pachyrhizi.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703925

Evaluation of cytotoxicity and wound healing activity of Avicennia schaueriana in cream
Provedor de dados: 42
Autores: LOPES,CAROLINE M.I.; BARATELLA-EVÊNCIO,LIRIANE; SOUZA,IVONE A. DE; OLIVEIRA,ERWELLY B. DE; SÁ,JÉSSICA G.A.; SANTANA,MARLLON A.N.; MARCELINO NETO,PEDRO P.; SANTANA,EDUARDA S. DE; SILVA,LUZIA A. DA; VIEIRA,JEYMESSON R.C.
Abstract:Avicennia schaueriana is found in Brazilian mangrove coast. The cytotoxicity in vitro of the Aqueous Extract of Leaves of Avicennia schaueriana (AELAs) and the healing activity of the plant in cream on mice skin wounds were evaluated in this study. The cytotoxic evaluation was performed on Vero cells. The healing activity was evaluated on mice treated during 5, 10 and 15 days with cream at 5%, solution of sodium chloride at 0.9% and dexpanthenol in cream at 5%. The extract did not show cytotoxicity, but showed mitogenic activity (100μg/ml). In morphometric analysis, the percentage of wound contraction after 10 days was higher in dexpanthenol group (93.41%). In 15 days, the lowest percentage of contraction was observed in the dexpanthenol group...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avicennia schaueriana; In vitro techniques; Re-epithelialization; Vero cells; Wound healing.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100805

Injective mappings and solvable vector fields
Provedor de dados: 42
Autores: Santos Filho,José R. dos; Tavares,Joaquim.
We establish a sufficient condition for injectivity in a class of mappings defined on open connected subsets of Rn , for arbitrary n. The result relates solvability of the appropriate vector fields with injectivity of the mapping and extends a result proved by the first author for n &lt; 3 . Furthermore, we extend the result to connected paracompact smooth oriented manifolds and show that the convexity condition imposes strong topological restrictions on the manifold.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fields; Injectivity; Mappings; Solvability; Vectors.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300002

Modulation by steroid hormones of a ''sexy'' acoustic signal in an Oscine species, the Common Canary Serinus canaria
Provedor de dados: 42
Autores: Rybak,Fanny; Gahr,Manfred.
The respective influence of testosterone and estradiol on the structure of the Common Canary Serinus canaria song was studied by experimentally controlling blood levels of steroid hormones in males and analyzing the consequent effects on acoustic parameters. A detailed acoustic analysis of the songs produced before and after hormonal manipulation revealed that testosterone and estradiol seem to control distinct song parameters independently. The presence of receptors for testosterone and estradiol in the brain neural pathway controlling song production strongly suggests that the observed effects are mediated by a steroid action at the neuronal level.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oscines; Common Canary; Song; Steroid hormones.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200026

Carbon isotopes and the K-T boundary in Argentina and Chile
Provedor de dados: 42
Autores: Ferreira,Valderez P.; Sial,Alcides N.; Parada,Miguel A.; Toselli,Alejandro J.; Aceñolaza,Florencio G.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400023

Assessment of sperm production and reproductive organs of Wistar rats to long-term exposure of Caesalpinia ferrea
Provedor de dados: 42
Autores: Lucinda,Leda M.F.; Rocha,Camila B.; Reboredo,Maycon M.; Faria,Vinícius C.; Sá,Rita C.S.
Caesalpinia ferrea Mart (Leguminosae) is a medicinal plant used to treat diabetes, among other therapeutic properties, but which is also reported to have hepatotoxic effects. Although it contains substances such as flavonoids and coumarin, which are known to have antifertility activity, no studies have apparently been conducted to evaluate the potential adverse side effects of this plant on the function of the reproductive system after a chronic treatment. Therefore, this investigation was carried out to evaluate the effect and safety of the long-term exposure to C. ferrea on male Wistar rats' vital organs, reproductive system and sperm production. Adult and immature male rats were treated with an aqueous extract of C. ferrea at a dose level of 300 mg/kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caesalpinia ferrea; Wistar rat; Reproductive system; Toxicological assessment; Chronic and sub-chronic treatment.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400013

Testing arbitrary classes of light in a physiognomically heterogeneous area of "campo rupestre" vegetation
Provedor de dados: 42
Autores: MOREIRA,ANA S.F.P.; BORBA,EDUARDO L.; LEMOS-FILHO,JOSE P.
The Brazilian "campo rupestre" vegetation shows high light heterogeneity, characteristic which is often disregarded in ecophysiological studies due the difficult of obtaining accurate measurements in a complex environment. The aim of the present study it was to describe how much heterogeneous is the light distribution in this environment, as well as tried to define classes in relation to the photosynthetically active radiation (PAR) for 30 rupicolous individuals of Bulbophyllum involutum. The individuals were marked and previously classified in light classes visually predetermined ("full sun", "partially shaded" and "shaded"). Once defined these classes, principal component analysis, cluster and dispersal analyses using direct and indirect PAR measures...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulbophyllum involutum; Habitat; Light heterogeneity; Multivariate analysis; Orchidaceae; Rocky outcrops.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200635

What the largest tadpole feeds on? A detailed analysis of the diet composition of Pseudis minuta tadpoles (Hylidae, Dendropsophini)
Provedor de dados: 42
Autores: HUCKEMBECK,SÔNIA; ALVES,LÍVIA T.; LOEBMANN,DANIEL; GARCIA,ALEXANDRE M.
ABSTRACT We analyzed the diet of 25 individuals of Pseudis minuta tadpoles which consisted in debris with more than 30%, follow by diatoms, euglenids, green algae, and desmids. With regard to the feeding strategy, P. minuta tadpoles are generalist consumer. The negative correlation between the abundance of items in the digestive tract and the mouth width indicate an effect of metamorphosis on the diet.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Anuran; Metamorphosis; Trophic ecology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401397

The influence of non-steroidal anti-inflammatory drugs and paracetamol used for pain control of orthodontic tooth movement: a systematic review
Provedor de dados: 42
Autores: CORRÊA,ADRIANO S.; ALMEIDA,VINÍCIUS L. DE; LOPES,BEATRIZ M.V.; FRANCO,ADEMIR; MATOS,FELIPE R. DE; QUINTANS-JÚNIOR,LUCINDO J.; RODE,SIGMAR M.; PARANHOS,LUIZ R.
ABSTRACT The present study aimed to perform a systematic literature review to determine if there is a non-steroidal anti-inflammatory drug (NSAID) that interferes less within tooth movement. This research was performed according to the PRISMA statement. Articles were searched in eight electronic databases (PubMed, Scopus, Embase, Web of Science, LILACS, SciELO, Google Scholar, and Open Grey). Only experimental studies on male Wistar rats were selected, which included experiments related to the influence of NSAIDs on orthodontic movement. Studies in animals with pathological conditions, literature review articles, letters to the editor and/or editorials, case reports, abstracts, books, and book chapters were excluded. Each of the steps of this systematic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-inflammatory; Drug; Orthodontics; Non-steroidal; Tooth movement.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602851

Commemorative Volume on the Centenary of the Brazilian Academy of Sciences: “Brazil: Frontiers of Chemical Sciences”
Provedor de dados: 42
Autores: CRESPILHO,FRANK N.
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200591

An insight on the role of photosensitizer nanocarriers for Photodynamic Therapy
Provedor de dados: 42
Autores: MESQUITA,MARIANA Q.; DIAS,CRISTINA J.; GAMELAS,SARA; FARDILHA,MARGARIDA; NEVES,MARIA G.P.M.S.; FAUSTINO,MARIA AMPARO F.
ABSTRACT Photodynamic therapy (PDT) is a modality of cancer treatment in which tumor cells are destroyed by reactive oxygen species (ROS) produced by photosensitizers following its activation with visible or near infrared light. The PDT success is dependent on different factors namely on the efficiency of the photosensitizer deliver and targeting ability. In this review a special attention will be given to the role of some drug delivery systems to improve the efficiency of tetrapyrrolic photosensitizers to this type of treatment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photodynamic therapy; Drug delivery; Liposomes; Silica nanoparticles; Gold nanoparticles; Polymeric micelles.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301101

Biotic potential, fertility and life table ofSpodoptera albula (Walker) (Lepidoptera: Noctuidae), under controlled conditions
Provedor de dados: 42
Autores: MONTEZANO,DÉBORA G.; SPECHT,ALEXANDRE; SOSA-GÓMEZ,DANIEL R.; ROQUE-SPECHT,VÂNIA F.; BORTOLIN,TARCISO M.; FRONZA,EDEGAR; PEZZI,PATRÍCIA; LUZ,PRISCILA C.; BARROS,NEIVA M.
This study aimed to evaluate the biotic potential, life table parameters and fertility of Spodoptera albula (Walker, 1857) under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photo phase). The longevity, pre, post and oviposition periods, fecundity and fertility of 13 couples were evaluated. The longevity of females (13.500 days) was significantly higher than those of males (11.154 days). The mean durations of the pre, post and oviposition periods were 2.615, 1.769 and 9.385 days, respectively. The mean fecundity was 1.417.69 eggs and mean fertility was 1.340.401 larvae, per female. On average, females copulated 1, 231 times. A strong positive correlation was observed between the number of copulations and fecundity (r = 0.847, p &lt;0.001), as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Armyworm; Development; Fecundity; Reproduction; Spermatophore.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200723

A survey of chemistry and biological activities of Chrysobalanaceae
Provedor de dados: 42
Autores: Castilho,Rachel O.; Souza,Ilélia de; Guimarães,Úrsula P.; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200020

Juvenile development of Callinectes danae Smith, 1869 (Crustacea, Decapoda, Brachyura, Portunidae) under laboratory conditions
Provedor de dados: 42
Autores: BOLLA Jr,EDUARDO A.; FRANSOZO,VIVIAN; NEGREIROS-FRANSOZO,MARIA LUCIA.
The juvenile development of Callinectes danae was investigated from megalopae obtained in neuston samples at Ubatuba, São Paulo, Brazil. The individuals were raised in the laboratory under constant temperature (25 ± 1°C), filtered sea water from the collection location (35‰), and natural photoperiod. Newly hatched Artemia sp. nauplii were offered as food on a daily basis and ornamental-fish food was also provided for the juveniles from the 4th stage on. Twelve stages of the juvenile phase were obtained. The main morphological features that allowed recognition of the first juvenile stage were drawn and described. All the subsequent stages obtained were examined and measured, and the main changes in relation to the first stage were recorded. Sexual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Juvenile stages; Morphology; Portunid; Post-larval; Swimming crab.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100211

Umbilic and Tangential Singularities on Configurations of Principal Curvature Lines
Provedor de dados: 42
Autores: GARCIA,RONALDO; SOTOMAYOR,JORGE.
In this paper is studied the relationship between quadratic tangencies of principal lines with the boundary of a surface and the Darbouxian umbilics of a smooth boundaryless surface which approximates it through the process of thickening and smoothing defined here.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tangential singularity; Umbilic point; Principal configuration.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100001

Urotrema macrotestis and Urotrema scabridum (Digenea: Urotrematidae) parasitizing bats (Mammalia: Chiroptera) in Brazil
Provedor de dados: 42
Autores: MELLO,ÉRICA M. DE; RABELO,ÉLIDA M.L.; SILVA,REINALDO J. DA.
Urotrema scabridum Braun 1900 and Urotrema macrotestis Mané-Garzón and Telias 1965 are reported from the small intestine of Eumops glaucinus (Wagner, 1843). The species were differentiated by the body width, the size and position of acetabulum, the size of testis, the caecal termination, and the distribution of vitellarium. The present study expands the distribution and the hosts of both species in Minas Gerais State and reports U. macrotestis parasitizing bats for the first time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eumops glaucinus; Infection; Taxonomy; Trematoda.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100616

Stratigraphy of amethyst geode-bearing lavas and fault-block structures of the Entre Rios mining district, Paraná volcanic province, southern Brazil
Provedor de dados: 42
Autores: HARTMANN,LÉO A.; ANTUNES,LUCAS M.; ROSENSTENGEL,LEONARDO M.
The Entre Rios mining district produces a large volume of amethyst geodes in underground mines and is part of the world class deposits in the Paraná volcanic province of South America. Two producing basalt flows are numbered 4 and 5 in the lava stratigraphy. A total of seven basalt flows and one rhyodacite flow are present in the district. At the base of the stratigraphy, beginning at the Chapecó river bed, two basalt flows are Esmeralda, low-Ti type. The third flow in the sequence is a rhyodacite, Chapecó type, Guarapuava subtype. Above the rhyodacite flow, four basalt flows are Pitanga, high-Ti type including the two mineralized flows; only the topmost basalt in the stratigraphy is a Paranapanema, intermediate-Ti type. Each individual flow is uniquely...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amethyst geode; Entre Rios mining district; Paraná volcanic province; Geochemistry; Gamma-spectrometry.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100187

Stromatolites in the mesoproterozoic Itaiacoca Group (se Brazil): paleoenvironmental inferences and comparisons with other similar forms
Provedor de dados: 42
Autores: Sallun Filho,William; Fairchild,Thomas R.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400021

Heavy metals of the Anta Stream S. J. Rio Preto - SP
Provedor de dados: 42
Autores: NASCIMENTO,SILVIA C.; HYPOLITO,RAPHAEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300016

Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil
Provedor de dados: 42
Autores: PINTO,VITER M.; HARTMANN,LÉO A.; SANTOS,JOÃO O.S.; MCNAUGHTON,NEAL J.
Ion microprobe age determinations of 102 detrital zircon crystals from a sand extrudite, Cretaceous Paraná volcanic province, set limits on the origin of the numerous sand layers present in this major flood basalt province. The zircon U-Pb ages reflect four main orogenic cycles: Mesoproterozoic (1155-962 Ma), latest Proterozoic-early Cambrian (808-500 Ma) and two Palaeozoic (Ordovician- 480 to 450 Ma, and Permian to Lower Triassic- 296 to 250 Ma). Two additional small concentrations are present in the Neoarchean (2.8 to 2.6 Ga) and Paleoproterozoic (2.0 to 1.7 Ga). Zircon age peaks closely match the several pulses of igneous activity in the Precambrian Brazilian Shield and active orogeny in Argentina. A main delimitation of the origin of the sand is the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Botucatu Formation; Brazil; Neoarchean to Palaeozoic ages; Provenance; Sand extrudite; Zircon U-Pb ages.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401611

Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil
Provedor de dados: 42
Autores: MEDEIROS,SILVIA R.; WIEDEMANN-LEONARDOS,CRISTINA M.; VRIEND,SIMON.
At the end of the geotectonic cycle that shaped the northern segment of the Ribeira Mobile Belt (Upper Proterozoic to Paleozoic age), a late to post-collisional set of plutonic complexes, consisting of a wide range of lithotypes, intruded all metamorphic units. The Várzea Alegre Intrusive Complex is a post-collisional complex. The younger intrusion consists of an inversely zoned multistage structure envolved by a large early emplaced ring of megaporphyritic charnoenderbitic rocks. The combination of field, petrographic and geochemical data reveals the presence of at least two different series of igneous rocks. The first originated from the partial melting of the mantle. This was previously enriched in incompatible elements, low and intermediate REE and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magma mingling; Post-collisional magmatism; Ribeira Belt.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100009

Meniscal allograft transplantation in rabbit
Provedor de dados: 42
Autores: VILELA,LIANA M.; CARLO,RICARDO J. DEL; Melo FILHO,EDSON V.; FAVARATO,LUKIYA S.C.; DUARTE,TATIANA S.; PONTES,KELLY C.S.; CUNHA,DAISE N.Q.
This study evaluated the technique for meniscal allograft transplantation using allografts preserved in glycerin 98% in rabbits. Euthanasia was performed at 70 days to compare the transplanted (TM1 to TM16) versus the contralateral meniscus (OM1 to OM16). Sixteen menisci, 8 transplanted and 8 contralateral, were submitted to gross examination, histomorphometric analysis for identification and quantification of cellular type, and for quantification and distribution of collagen fibers. A revascularization study was conducted in all of the other samples. Lengths of the OM varied from 0.9 to 1.0 cm and two TM were smaller. All TM were completely attached to the synovial membrane, except for one case that presented partial fixation. Both, TM and OM had similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Knee; Meniscal allograft; Survival analysis; Transplantation; Revascularization.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502205

Dilemma in the Brazilian Tropical Medicine: ‘Is speed more important than direction?’
Provedor de dados: 42
Autores: Lacerda,Marcus V.G.; Val,Fernando F.A.; Monteiro,Wuelton M.
Abstract Abstract: With the recent changes in the epidemiology of infectious diseases in Brazil, research funding has been changing in a manner that does not properly consider biodiversity and poverty-related diseases. The burden of disease and the affected neglected populations need to be part of the equation in developeding countries with limited funding.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical diseases; Brazil; Science; Politics; Public health.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600801

Feedstock and inoculum characteristics and process parameters as predictors for methane yield in mesophilic solid-state anaerobic digestion
Provedor de dados: 42
Autores: NIQUINI,GABRIELA R.; SILVA,SUZIMARA R.; COSTA JUNIOR,ESLY F.; COSTA,ANDRÉA O.S.
Abstract: In this study, several linear regression models were tested to predict the cumulative 30-day methane yield produced in mesophilic solid-state anaerobic digestion, employing diverse lignocellulosic biomass sources. Data collected from 13 studies were utilized, totalizing 86 experimental points, divided into regression and validation. Models containing higher order terms, the inverse of variables and interactions among all eleven input variables were tested. Simple linear models utilizing a single variable were unable to describe the methane production, giving an R² lower than 0.37. However, combinations of multiple variables and its inverses as only independent variable permitted an increase in simple linear models predictive capacity up to 63% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lignocellulosic biomass; Linear regression; Methane; Polynomial models; Solid-state anaerobic digestion.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700865

Seasonal variation in the essential oil of Pilocarpus microphyllus Stapf.
Provedor de dados: 42
Autores: TAVEIRA,FRANCISCA S. N.; ANDRADE,ELOISA H. A.; LIMA,WATERLOO N.; MAIA,JOSÉ G. S.
The essential oils of the leaves and fine stems of Pilocarpus microphyllus, collected on iron mineralized soil of the Serra de Carajás, Southeast of Pará State, Brazil, during the rainy and dry seasons, were obtained by hydrodistillation and analyzed by GC-MS. The main identified compounds were 2-tridecanone, beta-caryophyllene, 2-pentadecanone, caryophyllene oxide and germacrene D. Their percentage contents varied with the season, the greater values having been detected mainly in the rainy season. For 2-tridecanone and beta-caryophyllene the higher values were observed in the fine stem oils for the former, and in the leaf oils for the latter. For 2-pentadecanone, caryophyllene oxide and germacrene D they were also in the leaf oils. In general, the leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pilocarpus microphyllus; Rutaceae; Jaborandi; Essential oil composition; 2-tridecanone; 2-pentadecanone; Sesquiterpenes.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100004

Recent Advances and Perspectives in Cancer Drug Design
Provedor de dados: 42
Autores: MAGALHAES,LUMA G.; FERREIRA,LEONARDO L.G.; ANDRICOPULO,ADRIANO D.
ABSTRACT Cancer is one of the leading causes of death worldwide. With the increase in life expectancy, the number of cancer cases has reached unprecedented levels. In this scenario, the pharmaceutical industry has made significant investments in this therapeutic area. Despite these efforts, cancer drug research remains a remarkably challenging field, and therapeutic innovations have not yet achieved expected clinical results. However, the physiopathology of the disease is now better understood, and the discovery of novel molecular targets has refreshed the expectations of developing improved treatments. Several noteworthy advances have been made, among which the development of targeted therapies is the most significant. Monoclonal antibodies and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cancer; Targeted therapy; Cytotoxic therapy; Drug discovery.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301233

Feeding habits of the leaf litter frog Haddadus binotatus (Anura, Craugastoridae) from two Atlantic Forest areas in southeastern Brazil
Provedor de dados: 42
Autores: COCO,LÍVIA; BORGES JÚNIOR,VITOR N.T.; FUSINATTO,LUCIANA A.; KIEFER,MARA C.; OLIVEIRA,JANE C.F.; ARAUJO,PABLO G.; COSTA,BIANCA M.; SLUYS,MONIQUE VAN; ROCHA,CARLOS F.D.
Haddadus binotatus is an endemic anuran of the Brazilian Atlantic Forest and currently, there is no information about the diet of this species. We analyzed the diet of two populations of this anuran in two states in southeast Brazil. Samplings were carried out in 2004 in the state of Rio de Janeiro and in 2009 and 2010 in the state of Espírito Santo.Haddadus binotatus presented a rich diet composition, preying 19 prey types. Orthoptera, Coleoptera, and Blattodea were the most important preys in the Rio de Janeiro population, and Orthoptera, Araneae and Hemiptera were the most important in the Espírito Santo population. The diet composition differed numerically between the two localities, but not in terms of volume, which can reflect local differences in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arthropods; Diet; Generalist feeder; Sexual dimorphism.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100239

Assessment of the cytotoxic, genotoxic, and antigenotoxic activities ofCeltis iguanaea (Jacq.) in mice
Provedor de dados: 42
Autores: BORGES,FLAVIO F.V.; MACHADO,THIAGO C.; CUNHA,KÊNYA S.; PEREIRA,KARLA C.; COSTA,ELSON A.; PAULA,JOSÉ R. DE; CHEN-CHEN,LEE.
Ethnobotanical surveys of Cerrado native plants show that leaves of Celtis iguanaea (Jacq.) Sargent (Cannabaceae), popularly known in Brazil as “esporão de galo”, are used in folk medicine for body pain, asthma, cramps, poor digestion, urinary infection, kidney dysfunctions, as well as a stimulant and diuretic. This work aimed at evaluating possible C. iguanaea aqueous leaf extract (CALE) cytotoxicity, genotoxicity, and antigenotoxicity using the mouse bone marrow micronucleous test. To assess CALE genotoxicity, Swiss mice were orally treated with three different extract concentrations (100, 300, and 500 mgkg−1). To evaluate its antigenotoxicity, the same doses were used simultaneously with a single i.p. dose of mitomycin C (MMC, 4mg.kg−1). The frequencies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Genotoxicity; Mice; Medicinal plant.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300955

Brain serotonin depletion enhances the sodium appetite induced by sodium depletion or beta-adrenergic stimulation
Provedor de dados: 42
Autores: Lima,Hawlinston R. C.; Cavalcante-Lima,Haerishton R.; Cedraz-Mercez,Pedro L.; Costa-E-Sousa,Ricardo H.; Olivares,Emerson L.; Badauê-Passos-Jr,Daniel; Medeiros,Magda A.; Côrtes,Wellington S.; Reis,Luís C.
We investigate the influence of brain serotonin depletion on the sodium appetite. Rats depleted of serotonin through the systemic administration of p-chlorophenylalanine (300 mg/kg, ip, for 2 days) showed an intense natriorexigenic response induced by sodium depletion (furosemide, 20 mg/kg, sc, 24 h before water and 1.8% NaCl presentation). Intake of 1.8% NaCl was always higher than that observed for the control group (12.9 ± 1.4 and 21.4 ± 3.0 mL vs 5.7 ± 1.2 and 12.7 ± 1.6 mL, 30 and 300 min after water and saline presentation). After 24 h, the natriorexigenic response continued to be significantly higher compared to control (33.6±5.1 vs 21.9±3.6 mL,P &lt;0.05). Fourteen days after p-chlorophenylalanine administration, 1.8% NaCl intake did not differ...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sodium appetite; Brain serotonin depletion; Sodium and water depletion; Isoproterenol; Serotonergic system.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100008

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate
Provedor de dados: 42
Autores: SILVA,MARCONDES SILVA E; LAGES,ANDERSON S.; SANTANA,GENILSON P.
ABSTRACT This study covers the evaluation of the structure and the capacity in adsorbing orthophosphate ions of kaolinites collected from sampling sites in Manaus (Brazil). The kaolinites were obtained using physical fractioning (sieving/siphoning) techniques and chemical treatment with HCl, H2SO4, H2O2 and KCl. The investigation of the kaolinite lattices involved the Hinckley and Plançon indexes determined from X-ray diffraction data, Fourier transformed infrared spectroscopy, scanning electron microscopy and Mössbauer spectroscopy. The absorption capacity of orthophosphate ions was calculated by Freundlich and Langergren isotherms. A transitional state was observed in the crystallographic structure from kaolinites because of the isomorphic substitution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freundlich; Isomorphic substitution; Langergren; Manaus; Mössbauer.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401391

Flood-dominated fluvio-deltaic system: a new depositional model for the Devonian Cabeças Formation, Parnaíba Basin, Piauí, Brazil
Provedor de dados: 42
Autores: Ponciano,Luiza Corral M.O.; Della Fávera,Jorge C.
The depositional model of the Cabeças Formation is re-evaluated in the context of the Devonian paleogeography of the Parnaíba Basin, and with particular reference to similarities between the formation's facies associations on the eastern border of the basin and the flood-dominated fluvio-deltaic system facies that have been discussed in recent literature. The widespread occurrence and nature of sigmoidal clinoforms (with asymptotic cross-stratification and climbing ripples) of the Cabeças Formation are here considered as strong evidence of flood-influenced depositional settings. Sandy strata of the Passagem Member, in the vicinity of Pimenteiras and Picos (Piauí State), are interpreted as the distal part of fine-grained mouth-bar deposits interbedded with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parnaíba Basin; Devonian; Cabeças Formation; Flood-dominated fluvio-deltaic system; Delta-front sandstone lobes; Mouth-bar deposits; Hummocky cross-stratification.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400014

A Dual-mode model interpretation of CO2/CH4 permeability in polysulfone membranes at low pressures
Provedor de dados: 42
Autores: BIONDO,LUCAS D.; DUARTE,JOCELEI; ZENI,MARA; GODINHO,MARCELO.
ABSTRACT An asymmetric membrane of polysulfone (PSf) was synthesized by phase inversion method. Permeation experiments were carried out between 2 to 5 bar pressure, and at temperatures 20 to 45°C. The dense-selective layer of PSf membrane presents regular thickness (about 5 µm), and was not possible to observe the formation of macrovoids in porous layer. The CO2 permeability through membrane was 18.8 Barrer at 35°C and 2 bar pressure, and this relationship between the pressure and the CO2 permeability was described adequately by Dual-mode model. The absence of CH4 permeability at 2 and 3 bar pressure, qualifies the PSf membrane for gases separation with high selectivity in this range.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymmetric membranes; CO2/CH4 permeability; Dual-mode model; Polysulfone.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401855

Crude ethanol extract from babassu (Orbignya speciosa): cytotoxicity on tumoral and non-tumoral cell lines
Provedor de dados: 42
Autores: Rennó,Magdalena N.; Barbosa,Gleyce M.; Zancan,Patricia; Veiga,Venicio F.; Alviano,Celuta S.; Sola-Penna,Mauro; Menezes,Fábio S.; Holandino,Carla.
Plant-derived substances have been considered as important sources of drugs, including antineoplasic agents. Babassu mesocarp is popularly used in Brazil as a food additive, and in popular medicine against several conditions, such as inflammations, menstrual pains and leukaemia. From babassu Orbignya speciosa (Mart.) Barb. Rodr. [Arecaceae (Palmae)] epicarp/mesocarp, an ethanol extract was prepared and named OSEME, which was tested on the viability,morphology and metabolism of several cell lines, such as the leukaemic cell lines, HL-60, K562 and the latter multidrug resistant counterpart K562-Lucena 1, the human breast cancer cell line MCF-7, the mouse fibroblast cell line 3T3-L1 and fresh human lymphocytes. OSEME promoted a dose-dependent decrease on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumoral agents; Ethanol extract; Orbignya speciosa.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300008

Trichomes and hydrocarbons associated with the tomato plant antixenosis to the leafminer
Provedor de dados: 42
Autores: Fernandes,Maria Elisa S.; Fernandes,Flávio L.; Silva,Derly J.H.; Picanço,Marcelo C.; Jhamc,Gulab N.; Carneiro,Pedro C.; Queiroz,Renan B.
The objective of this work was to study the density of trichomes and hydrocarbons associated with the resistance by antixenosis of 42 subsamples of tomato plants from the Horticultural Germplasm Bank of the Universidade Federal de Viçosa (HGB-UFV) to Liriomyza trifolii. These subsamples were studied in addition to 'Santa Clara' cultivar, which was used as a standard of susceptibility to leafminers. The evaluated characteristics were the number of mined leaflets per plant, mines per plant, trichome density and chemical compounds in the leaves. Differences were detected among the subsamples in the variables studied. We identified 20 peaks in the chromatograms of leaf hexane extract the subsamples tested. The subsamples HGBs - 216, 813, 985, 987, 991, 992,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liriomyza trifolii; Solanum lycopersicum; Germplasm; Pest resistance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100021

Proceedings of the Third Gondwanan Dinosaur Symposium
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Tomida,Yukimitsu.
Tipo: Info:eu-repo/semantics/other
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100001

Zirconium phosphonate/1,4,5,8-naphthalenediimides self-assembled films
Provedor de dados: 42
Autores: RODRIGUES,MAGALI A.; PETRI,DENISE F.S.; POLITI,MARIO J.; BROCHSZTAIN,SERGIO.
The formation and characterization of self-assembled films of zirconium phosphonate / N,N'-di(2-phosphonoethyl)-1,4,5,8-naphthalenediimide (DPN) is presented. The films were produced on glass substrates by deposition of alternating layers of Zr+4 and DPN. Films containing up to 16 layers on each side of the substrate were obtained and monitored by absorption spectroscopy and ellipsometry. When irradiated, the initially colorless films turned to a persistent pinky color reminiscent of that of DPN anion radical. These films are a promising material to the development of photovoltaic devices.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zirconium phosphonates; Naphthalenediimides; Self-assembled films.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100010

Atrazine and nicosulfuron affect the reproductive fitness of the predator Podisus nigrispinus (Hemiptera: Pentatomidae)
Provedor de dados: 42
Autores: REIS,TATIANE C.; SOARES,MARCUS A.; SANTOS,JOSÉ B. DOS; SANTOS,CONCEIÇÃO A. DOS; SERRÃO,JOSE EDUARDO; ZANUNCIO,JOSÉ C.; FERREIRA,EVANDER A.
Abstract Herbicides can impact non-target metabolic pathways in natural enemies and lead to the reduction of these populations in the field. Behavioral characteristics, morphology and histology of reproductive structures and reproduction of females of Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae) were evaluated under the effect of the herbicides atrazine, nicosulfuron and the mixture of both. The number of mature oocytes per ovary was lower in females exposed to the herbicides atrazine, nicosulfuron and the mixture of both. Herbicides did not affect the longevity and mortality of P. nigrispinus, therefore, they are selective for this predator. On the other hand, herbicides can cause sublethal effects by affecting the reproduction of predators.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Histology; Morphology; Reproduction; Herbicides.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703625

Toxicological Evaluation of Anti-Scrapie Trimethoxychalcones and Oxadiazoles
Provedor de dados: 42
Autores: FIGUEIREDO,CLAUDIA P.; FERREIRA,NATALIA C.; PASSOS,GISELLE F.; COSTA,ROBSON DA; NEVES,FERNANDA S.; MACHADO,CLARICE S.C.; MASCARELLO,ALESSANDRA; CHIARADIA-DELATORRE,LOUISE D.; NEUENFELDT,PATRÍCIA D.; NUNES,RICARDO J.; CORDEIRO,YRAIMA.
An altered form of the cellular prion protein, the PrPScor PrPRes, is implicated in the occurrence of the still untreatable transmissible spongiform encephalopathies. We have previously synthesized and characterized aromatic compounds that inhibit protease-resistant prion protein (PrPRes) accumulation in scrapie-infected cells. These compounds belong to different chemical classes, including acylhydrazones, chalcones and oxadiazoles. Some of the active compounds were non-toxic to neuroblastoma cells in culture and seem to possess drugable properties, since they are in agreement with the Lipinski´s rule of 5 and present desirable pharmacokinetic profiles as predicted in silico. Before the evaluation of the in vivo efficacy of the aromatic compounds in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prion; Acute toxicity; Organic compound; Drug safety; Scrapie; Pharmacokinetics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301421

Composition and structure of bird communities in vegetational gradients of Bodoquena Mountains, western Brazil
Provedor de dados: 42
Autores: GODOI,MAURICIO N.; SOUZA,FRANCO L.; LAPS,RUDI R.; RIBEIRO,DANILO B.
ABSTRACT The informations of bird species distribution in different habitats and the structure of their communities are crucial for bird conservation. We tested the differences in composition, richness and abundance of birds in different phytophysiognomies at Bodoquena Mountains, western Brazil, and we demonstrated the variations in richness and abundance of birds between different trophic groups. Sampling was conducted between July 2011 and June 2012 in 200 point counts arranged in the study area. A total of 3350 contacts were obtained belonging to 156 bird species. Woodland savannas, seasonal forests and arboreal savannas had higher bird abundance and richness, while riparian forests, clean pastures and dirty pastures had smaller values of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Habitat use; Point counts; Private Reserves; Trophic groups.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100211

Cytisus scoparius (Fam. Fabaceae) in southern Brazil - first step of an invasion process?
Provedor de dados: 42
Autores: Cordero,Rodrigo León; Torchelsen,Fábio P.; Overbeck,Gerhard E.; Anand,Madhur.
The occurrence of Scotch broom Cytisus scoparius (L.) Link (Fabaceae), is reported for the first time in Brazil. The species has been registered in the species-rich Campos Sulinos grasslands, in the Campos de Cima da Serra, and in the Serra do Sudeste. Naturalizing populations were frequently formed in natural habitats near to human settlements, where prevailing land uses and disturbances facilitate dispersal and establishment. The plant is an invasive species that has globally caused significant damage to biodiversity and economic losses. In Brazil, the species has a strong potential for spreading into a wide range of ecosystems. The Atlantic Forest biome and part of the Pampa biome, together known as the Campos Sulinos, represent optimal areas for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alien species; Early detection; Ecology; Grassland; Scotch broom.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100149

Combination of fixative agents and fixation times to visually differentiate the cortical from the medullary layer in bovine adrenal glands
Provedor de dados: 42
Autores: OLIVEIRA,FABRÍCIO S.; MACITELLI,FERNANDA; SANTOS,CAIO C.C.; BRAGA,JANAINA S.; COSTA,BARBARA C.; PASTORE,MARINA; ROCHA,THIAGO A.S.S.; COSTA,MATEUS J.R.P. DA.
Abstract Chronic stress exposure commonly increases adrenals weight and changes their morphology. This study aimed to compare four methods to delimitate the cortical and medullary layers of adrenals glands in Nelore bulls. Fresh adrenals did not present differentiation between layers. Then, frozen adrenals were distributed in plastics bags with fixative Bouin (G1), 96ºGL ethylic alcohol (G2), 10% formaldehyde (G3), or 2.5% glutaraldehyde (G4). After 12 hours of fixation, the G1 adrenal glands did not show the entire cortical layer marked by Bouin’s solution. For G2 and G3 there was a poor contrast, while for G4 there was a reasonable contrast. After 24 hours of fixation, G1 had an excellent contrast between layers, while G2 and G4 had a reasonable contrast...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Morphometry; Stress; Anatomy; Gland.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703887

The Ilha Anchieta Quartz Monzonite: the southernmost expression of ca. 500 Ma post-collisional magmatism in the Ribeira Belt
Provedor de dados: 42
Autores: Sobrinho,José M. Azevedo; Janas,Valdecir A.; Simonetti,Antonio; Heaman,Larry M.; santoro,Jair; Diniz,Hélio N.
The Ilha Anchieta Quartz Monzonite (IAQM) occupies most of the homonymous island in the coast of the state of São Paulo, and is intrusive into foliated rocks of the ~565 Ma Ubatuba Charnockite. The main petrographic variety is a porphyritic biotite-hornblende quartz monzonite with 2-4 cm tabular microcline megacrysts set in a medium-grained groundmass and magmatic foliation. Outcrop-scale structures indicate cumulative processes (modal and grain-size magmatic banding) and interaction with basic magmas (mafic microgranular enclaves). Lithogeochemical data indicates that the main variety is intermediate to acid (S1O2 = 63-67%), alkali-calcic, metaluminous and magnesian (mg# ~30), showing moderate Sr (300-400 ppm) and Ba (~1500 ppm) contents and relatively...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Granite; Lithogeochemistry; LA-ICPMS; Zircon U-Pb dating; Ribeira Belt.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300010

Erratum to: Meristematic activity of the endodermis and the pericycle in the primary thickening in monocotyledons. Considerations on the "PTM" [An Acad Bras Cienc 77(2005): 259-274]
Provedor de dados: 42
Autores: Menezes,Nanuza L. de; Silva,Delmira C.; Arruda,Rosani C.O.; Melo-de-Pinna,Gladys F.; Cardoso,Vanessa A.; Castro,Neuza M.; Scatena,Vera L.; Scremin-Dias,Edna.
Tipo: Info:eu-repo/semantics/article
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400005

In memoriam Carlos Chagas Filho
Provedor de dados: 42
Autores: CAVALCANTE,LENY A.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300001

Dispersal Syndromes of fossil Seeds from the Lower Permian of Paraná Basin, Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: Souza,Juliane M.; Iannuzzi,Roberto.
The morphological analysis of seeds has been an important subject in modern ecological studies, once it provides evidence about the biology and adaptations of the parent plant. However, this kind of study has been restricted to the ecology of modern plants and is rarely used in interpretations of Paleozoic data. From the understanding of dispersal syndromes analysis as an important tool to paleoecological reconstruction, this study provides a first approach using this tool with seeds from the Lower Permian strata of southern Paraná Basin in Rio Grande do Sul. Based on previously classified seeds and using their biological and taphonomic data, the syndrome of dispersal was interpreted, and their placement in successional groups (pioneer, early-successional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Samaropsis; Cordaicarpus; Dispersal syndromes; Ecological groups; Lower Permian; Paraná Basin.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100006

Limnology of the largest multi-use artificial reservoir in NE Brazil: The Castanhão Reservoir, Ceará State
Provedor de dados: 42
Autores: LACERDA,LUIZ D.; SANTOS,JANAÍNA A.; MARINS,ROZANE V.; SILVA,FRANCISCO A.T.F. DA.
Abstract This work reviews the limnology of the largest multi-use reservoir in NE Brazil, the Castanhão Reservoir in Ceará State, during 5 years of an extended drought when the reservoir’s volume decreased from 88% to about 30%. Major physical and chemical parameters of the water column, phytoplankton community, trophic state and sediment geochemistry were monitored, as well as the impact from extensive aquaculture. Water quality of the full reservoir was maintained due to hydrodynamics, which transport nutrients to the hypolimnion of a stratified water column, rendering an oligotrophic state to the reservoir, notwithstanding the large nutrient inputs from aquaculture and irrigated agriculture. However, with the extension of the drought period, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochemistry; Hydrodynamics; Nutrients; Water quality; Sediments; Aquaculture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502073

Reproductive Biology of Varronia curassavica Jacq. (Boraginaceae)
Provedor de dados: 42
Autores: HOELTGEBAUM,MARCIA P.; MONTAGNA,TIAGO; LANDO,ANA PAULA; PUTTKAMMER,CATARINA; ORTH,AFONSO INÁCIO; GUERRA,MIGUEL P.; REIS,MAURÍCIO S. DOS.
ABSTRACT Varronia curassavica, a subshrubby medicinal species associated with restinga in the Atlantic Forest, has been exploited by local people and the pharmaceutical industry. Indeed, restingas have experienced a continuous process of degradation, and thus, with species and ecosystem both at risk, efforts to support conservation actions are required. The present study aimed to evaluate aspects of V. curassavica reproductive biology. To accomplish this, morphological characterization was performed by monitoring flowering events. The availability of nectar and pollen, as well as the frequency and behavior of floral visitors and dispersers, was also evaluated. This species exhibits both heterostyly and protogyny. Anthesis is diurnal, and flowers last less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersion; Heterostyly; Pollination; Floral resources.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100059

Redescription of immatures of Dasyhelea flavifrons Guérin-Méneville (Culicomorpha: Ceratopogonidae) and new contribution to the knowledge of its larval habitats
Provedor de dados: 42
Autores: DÍAZ,FLORENTINA; MANGUDO,CAROLINA; GLEISER,RAQUEL M.; RONDEROS,MARÍA M.
Abstract: The fourth instar larva and pupa of Dasyhelea flavifrons Guérin-Méneville are redescribed, illustrated, and photomicrographed using binocular, phase-contrast, and scanning electron microscopy. Comparisons with the American species of the grisea group were made. The immatures were collected by using a siphon bottle in tree-holes and from water collected in dead snail shells in Salta Province, Argentina, transported to the laboratory and there bred to the emergence of the adults. Details on larval habitats are given. These are the first records from Argentina and in gastrotelmata.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceratopogonidae; Dasyhelea flavifrons; Gastrotelmata; Immatures; Tree holes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100623

Campomanesia adamantium (Cambess.) O. Berg seed desiccation: influence on vigor and nucleic acids
Provedor de dados: 42
Autores: DRESCH,DAIANE M.; MASETTO,TATHIANA E.; SCALON,SILVANA P.Q.
The aim of this study was to evaluate the sensitivity of Campomanesia adamantium seeds to desiccation by drying in activated silica gel (fast) and under laboratory conditions (slow). To assess the sensitivity of the seeds to desiccation, we used drying with silica gel and drying under laboratory conditions (25 °C), in order to obtain seeds with moisture content of 45, 35, 30, 25, 20, 15, 10 and 5%. The physiological potential of the seeds after desiccation was evaluated by measuring primary root protrusion, percentage of normal seedlings, germination seed index, seedling length, total seedling dry mass, electrical conductivity and DNA and RNA integrities. The C. adamantium seeds were sensitive to desiccation and to a reduction in moisture content to 21.1%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; DNA; Drying; RNA; Viability.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502217

Synthesis and antimicrobial activity of new amino derivatives of pyrano[4’’,3’’:4’,5’]pyrido[3’,2’:4,5]thieno[3,2-d]pyrimidine
Provedor de dados: 42
Autores: SIRAKANYAN,SAMVEL N.; GERONIKAKI,ATHINA; SPINELLI,DOMENICO; HAKOBYAN,ELMIRA K.; KARTSEV,VIKTOR G.; PETROU,ANTHI; HOVAKIMYAN,ANUSH A.
ABSTRACT Annulated thienopyrimidine derivatives attracted big interest of the scientific community due to their broad spectrum of biological activities among which are the inhibition of phosphodiesterase, antiproliferative and antimicrobial activities. As a continuation of our studies on the synthesis and biological activity of fused thieno[3,2-d]pyrimidine derivatives, the goal of this paper is the synthesis and study of the properties of compounds containing different heterocycles such as fused thieno[2,3-b]pyridine and tetrazolo[1,5-c]pyrimidine in the same molecule. Thus, starting from the ethyl 1-amino-5-isopropyl-8,8-dimethyl-8,9-dihydro-6H-pyrano[4,3-d]thieno[2,3-b]pyridine-2-carboxylate 1, efficient methods for obtaining new...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino derivatives; Antimicrobial activity; Azide/tetrazole equilibrium; Nucleophilic substitution; Thieno[3; 2-d]pyrimidine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301043

Impact of immunological state on eco-physiological variables in one of the southernmost lizards in the world
Provedor de dados: 42
Autores: DURAN,FERNANDO; BORETTO,JORGELINA M.; FERNÁNDEZ,JIMENA B.; MOLINA,MORA IBÁÑEZ; MEDINA,MARLIN S.; IBARGÜENGOYTÍA,NORA R.
Abstract:  The immune state is an essential component of survival as it directly influences physiological performance and health status. Variation in the leukocyte profile, a significantly increase in body temperature, and a detriment of the eco-physiological performance are among the possible consequences of an unhealthy state. In this study we analyse and discuss how field body temperature, preferred body temperature, the speed for sprint and long runs, locomotor stamina, and body condition can be affected by the immunological state (i.e. leukocyte profile) in a wild population of Liolaemus sarmentoi. Juveniles and adult males with a high percentage of eosinophils, basophils, and a low percentage of monocytes preferred higher body temperatures in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body condition; Leukocyte profile; Liolaemus sarmientoi; Locomotor performance; Thermoregulation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700608

Interactions among insect-resistant soybean genotypes extracts with populations of Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) susceptible and resistant to its nucleopolyhedrovirus
Provedor de dados: 42
Autores: Piubelli,Giorla C.; Moscardi,Flávio; Hoffmann-Campo,Clara B.
Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV) is being used in Brazil as a biological insecticide. Host plant resistance of soybean to insects is been searched for and some authors have mentioned the interference of plant chemistry in virus efficiency. Interactions among soybean extracts of genotypes used as a source of resistance (PI 274454 and PI 227687) with different AgMNPV concentrations in populations of A. geatalis susceptible (S) and resistant (R) to the virus were studied at laboratory condition. Higher mortality was observed when larvae fed on diets with extracts of the soybean genotypes compared with those fed on a plain diet (control). The mean lethal concentration (LC50) was reduced about 10 ties in the S-population fed on diets...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Velvetbean caterpillar; Baculovirus; Leaf extracts; Resistant genotypes; Soybean.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400021

Alcoholic extract of propolis in Nile tilapia post-larvae and fingerlings’ diets: effects on production performance, body composition and intestinal histology
Provedor de dados: 42
Autores: SANTOS,LILIAN D. DOS; ZADINELO,IZABEL V.; SILVA,LILIAN C.R. DA; ZILLI,ROGÉRIO L.; BARREIROS,MARCO ANTONIO B.; MAUERWERK,MARLISE T.; MEURER,FÁBIO.
Abstract: The aim of this study was to evaluate the production performance of Nile tilapia post-larvae and fingerlings fed with increasing levels of alcoholic extract of propolis into diets. In Experiment 1, 1800 post-larvae were distributed in 30 tanks, in a completely randomized design with five treatments composed by the inclusion of 0, 1, 2, 3 and 4 g of dry propolis/kg of feed, and six replicates. In experiment 2, 1600 fingerlings were distributed in the same system and designed as experiment 1. No significant effect was observed between treatments, for final weight, total and standard length, survival, and intestinal villus height. However, the propolis extract inclusion of 1 g/kg in Nile tilapia post-larvae and fingerlings’ feed resulted in a better...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth promoters; Natural compound; Oreochromis niloticus; Sex reversal effectiveness.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300853

Testing the influence of a sand mica mixture on basin fill in extension and inversion experiments
Provedor de dados: 42
Autores: GOMES,CAROLINE J.S.; D'ANGELO,TAYNARA; ALMEIDA,GISELA M.S.
We compare the deformation patterns produced by sand and a sand mica mixture (14:1 ratio of sand to mica by weight) while simulating basin fill in extension and inversion models to analyze the potential of the sand mica mixture for applications that require a strong elasto-frictional plastic analogue material in physical models. Sand and the sand mica mixture have nearly equal angles of internal friction, but the sand mica mixture deforms at a significantly lower level of peak shear stress. In extension, the sand mica mixture basin fill experiments show fewer normal faults. During inversion, the most striking difference between the sand and the sand mica mixture basin fill experiments is related to the internal deformation in fault-propagation folds, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analogue modeling; Sand mica mixture; Tectonic inversion; Basal friction; Fault-propagation folds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100051

Hepatic toxicity caused by PLGA-microspheres containing usnic acid from the lichen C ladonia substellata (AHTI) during pregnancy in Wistar rats
Provedor de dados: 42
Autores: MARINHO,KETSIA S.N.; ANTONIO,ERIVALDO A.; SILVA,CAMILLA V.N.S.; SILVA,KEILA T. DA; TEIXEIRA,VALÉRIA W.; AGUIAR JUNIOR,FRANCISCO C.A. DE; SANTOS,KATHARINE R.P. DOS; SILVA,NICÁCIO H. DA; SANTOS,NOEMIA P.S.
ABSTRACT This study aimed to evaluate the teratogenic and hepatotoxic potential of the usnic acid encapsulated into PLGA-microspheres. In total, 12 female Wistar rats in pregnancy were randomly distributed in the control group (n= 6) that received 1.0 mL of physiological solution and treatment group (n= 6) that received 25 mg/kg of encapsulated usnic acid by oral administration. All females were euthanized at day 20 of pregnancy and their fetuses were removed and analyzed. During the pregnancy was observed a reduction in weight gain. There was no difference in serum transaminases levels analyzed as well as any difference in liver weight in both groups. The histomorphometric analysis of the liver from the treatment group revealed an increase in number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Encapsulation; Fetotoxicity; Hepatotoxicity; Secondary metabolite.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301073

Agronomic performance and genetic divergence between genotypes of Manihot esculenta
Provedor de dados: 42
Autores: GILES,JOÃO ANTONIO D.; OLIOSI,GLEISON; RODRIGUES,WEVERTON P.; BRAUN,HEDER; RIBEIRO-BARROS,ANA I.; PARTELLI,FÁBIO L.
Abstract The morphoagronomic characterization of 12 genotypes of M. esculenta was performed during the 2013/2014 and 2014/2015 crop years. The 12 genotypes were planted in a randomized block design, with four replicates per genotype. Number of tuberous roots per plant, weight of tuberous roots, root yield, total plant weight, harvest index, plant height, height of first branch, number of shoots, stem diameter, number of buds, leaf dry weight and petiole length were evaluated. Genotypes “Camuquem” and “Goiás” were the most productive, and “Amarela” and “Gema de Ovo” were the most divergent. Seventy percent of genetic diversity was due to petiole length (22.86%), root yield (19.20%), weight of tuberous roots (14.89%) and number of buds (13.72%). Overall, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava; Plant breeding; Dissimilarity; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703639

Temporal dynamics of the response to Al stress in Eucalyptus grandis × Eucalyptus camaldulensis
Provedor de dados: 42
Autores: Alcântara,Berenice K. de; Pizzaia,Daniel; Piotto,Fernando A.; Borgo,Lucélia; Brondani,Gilvano E.; Azevedo,Ricardo A.
Lipid peroxidation and root elongation of Eucalyptus grandis × Eucalyptus camaldulensis were studied under stress conditions in response to aluminum (Al), a metal known to limit agricultural productivity in acidic soils primarily due to reduced root elongation. In Brazil, the Grancam 1277 hybrid (E. grandis × E. camaldulensis) has been planted in the "Cerrado", a region of the country with a wide occurrence of acidic soils. The present study demonstrated that the hybrid exhibited root growth reduction and increased levels of lipid peroxidation after 24h of treatment with 100 µM of Al, which was followed by a reduction in lipid peroxidation levels and the recovery of root elongation after 48h of Al exposure, suggesting a rapid response to the early...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum; Eucalypt; Lipid peroxidation; Oxidative stress; Root growth.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201063

A phytosociological analysis and synopsis of the dry woodlands and succulent vegetation of the Peruvian Andes
Provedor de dados: 42
Autores: GALÁN-DE-MERA,ANTONIO; SÁNCHEZ-VEGA,ISIDORO; LINARES-PEREA,ELIANA; CAMPOS,JOSÉ; MONTOYA,JUAN; VICENTE-ORELLANA,JOSÉ A.
ABSTRACT A phytosociological approach to dry forest and cactus communities on the occidental slopes of the Peruvian Andes is presented in base of 164 plots carried out following the Braun-Blanquet method. From them, 52 have been made recently, and the other 112 were taken from the literature. After a multivariate analysis, using a hierarchical clustering and a detendred correspondence analysis, the Acacio-Prosopidetea class (dry forest and cactus communities, developed on soils with some edaphic humidity or precipitations derived from El Niño Current), the Opuntietea sphaericae class (cactus communities of central and southern Peru, on few stabilized rocky or sandy soils) and the Carico-Caesalpinietea class (dry forests of the Peruvian coastal desert,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acacio-Prosopidetea; Cactus communities; Dry forests; Opuntietea sphaericae; Peru; Phytosociology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200689

Characterization and in vitro antitumor activity of polymeric nanoparticles loaded with Uncaria tomentosa extract
Provedor de dados: 42
Autores: RIBEIRO,ANA F.; SANTOS,JULIANA F.; MATTOS,RÔMULO R.; BARROS,ELIANE G.O.; NASCIUTTI,LUIZ EURICO; CABRAL,LÚCIO M.; SOUSA,VALERIA P. DE.
Abstract  Uncaria tomentosa (UT) extracts have been shown to have promising anti-tumor activity. We hypothesized that its incorporation into nanostructured systems could improve the anticancer properties. Here, poly-e-caprolactone (PCL) and poly-d,l-lactide-co-glycolide (PLGA) were employed to generate nanoparticles loaded with UT extract in a single emulsion solvent evaporation method. The nanoparticles were characterized by particle size, zeta potential, morphology and entrapment efficiency along with stability and release profiles. The nanoparticles presented entrapment efficiencies above 60% and a mean diameter below 300nm. UT-PCL nanoparticles presented higher entrapment efficiency and mean particle size as well as a slow release rate. The UT-PLGA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nanoparticles; Prostate cancer; PLGA; PCL; Anti-tumor; Anti-cancer; Cat’s Claw.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100908

Morphosynthesis: high fidelity inorganic replica of the fibrous network of loofa sponge (Luffa cylindrica)
Provedor de dados: 42
Autores: Mazali,Italo O.; Alves,Oswaldo L.
High fidelity calcium carbonate and hydroxyapatite (bio) inorganic replicas of the fibrous network of the dried fruit of Luffa cylindrica are described, utilizing a facile synthetic route. The loofa sponge is a highly complex macroscopic architectural template, an inexpensive and sustainable resource. In the context of the morphosynthesis, the capability of replication of the loofa sponge opens the possibility of the use of biodiversity in obtaining new materials. We would like to emphasize that the template proposed in this paper, makes possible the preparation of inorganic replicas with a very desirable size, on the centimeter scale. This fact is innovative with respect to inorganic replicas described in the literature, which predominate at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphosynthesis; Biomimetic synthesis; Morphology; Calcite; Hydroxyapatite.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100003

Protein extraction methods of tomato, environmental changes of the Amazon Forest in Roraima (northernmost part of Brazil) for the last 1000 years, and histological characteristics of a dolphin species
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401497

Environmental drivers on leaf phenology of ironstone outcrops species under seasonal climate
Provedor de dados: 42
Autores: GARCIA,LETÍCIA C.; BARROS,FERNANDA V.; LEMOS-FILHO,JOSÉ P.
ABSTRACT Banded iron formations (BIF) have a particular vegetation type and provide a good model system for testing theories related to leaf phenology, due to unique stressful environmental conditions. As a consequence of the stressful conditions of BIF environment, we hypothesize that most species would retain at least some significant canopy cover, even at the end of the dry season, independently of growth form - trees, shrubs, and sub-shrubs. Considering the strong seasonality, we also hypothesize that photoperiod and rainfall act as triggers for leaf fall and leaf flushing in these environments. The majority of the fifteen studied species had a semi-deciduous behavior and shed their leaves mainly during the dry season, with a recovery at the end of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canga; Day length; Drought stress; Evergreen; Leaf shedding; Tropical ecosystems.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100131

Carbonate Buildups in the Pernambuco Basin, NE Brazil
Provedor de dados: 42
Autores: BUARQUE,BRUNO V.; BARBOSA,JOSÉ A.; OLIVEIRA,JEFFERSON T.C.; MAGALHÃES,JOSÉ R.G.; CORREIA FILHO,OSVALDO J.
ABSTRACT The Pernambuco Basin represents one of the most prominent regions for deep water oil and gas exploration off the Brazilian coast. This study aims to identify and describe the occurrence of carbonate buildups in the offshore regions of the basin. The study was based on an analysis of a set of 143 2D time-migrated seismic sections that cover the offshore region of the Pernambuco Basin. An interpretation of the seismic dataset was used to define the main seismic sequences related to the main regional pulses of deposition and to identify three main groups of carbonate buildups: 1) shelf margin reefs, 2) patch reefs, and 3) isolated carbonate buildups. The carbonate buildups formed in two main intervals during post-rift sequences of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbonate buildup; Pernambuco Basin; Brazilian margin; Seismic stratigraphy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300841

Entry, dispersion and differentiation of microglia in the developing central nervous system
Provedor de dados: 42
Autores: NAVASCUÉS,JULIO; CALVENTE,RUTH; MARÍN-TEVA,JOSÉ L.; CUADROS,MIGUEL A.
Microglial cells within the developing central nervous system (CNS) originate from mesodermic precursors of hematopoietic lineage that enter the nervous parenchyma from the meninges, ventricular space and/or blood stream. Once in the nervous parenchyma, microglial cells increase in number and disperse throughout the CNS; these cells finally differentiate to become fully ramified microglial cells. In this article we review present knowledge on these phases of microglial development and the factors that probably influence them.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microglia; Hematopoietic lineage; Meninges; Migration; Proliferation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100013

Synthesis of calcium-phosphate and chitosan bioceramics for bone regeneration
Provedor de dados: 42
Autores: FINISIE,MELLATIE R.; JOSUÉ,ATCHE; FÁVERE,VALFREDO T.; LARANJEIRA,MAURO C. M.
Bioceramic composites were obtained from chitosan and hydroxyapatite pastes synthesized at physiological temperature according to two different syntheses approaches. Usual analytical techniques (X-ray diffraction analysis, Fourier transformed infrared spectroscopy, Thermo gravimetric analysis, Scanning electron microscopy, X-ray dispersive energy analysis and Porosimetry) were employed to characterize the resulting material. The aim of this investigation was to study the bioceramic properties of the pastes with non-decaying behavior from chitosan-hydroxyapatite composites. Chitosan, which also forms a water-insoluble gel in the presence of calcium ions, and has been reported to have pharmacologically beneficial effects on osteoconductivity, was added to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioceramic; Chitosan; Hydroxyapatite; Composites; Bone regeneration.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400006

Recovering missing data: estimating position and size of caudal vertebrae in Staurikosaurus pricei Colbert, 1970
Provedor de dados: 42
Autores: Grillo,Orlando N.; Azevedo,Sergio A.K.
Missing data is a common problem in paleontology. It makes it difficult to reconstruct extinct taxa accurately and restrains the inclusion of some taxa on comparative and biomechanical studies. Particularly, estimating the position of vertebrae on incomplete series is often non-empirical and does not allow precise estimation of missing parts. In this work we present a method for calculating the position of preserved middle sequences of caudal vertebrae in the saurischian dinosaur Staurikosaurus pricei, based on the length and height of preserved anterior and posterior caudal vertebral centra. Regression equations were used to estimate these dimensions for middle vertebrae and, consequently, to assess the position of the preserved middle sequences. It also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Missing data; Caudal vertebra; Regression; Staurikosaurus pricei.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100004

Chemical carcinogenesis
Provedor de dados: 42
Autores: Oliveira,Paula A.; Colaço,Aura; Chaves,Raquel; Guedes-Pinto,Henrique; De-La-Cruz P.,Luis F.; Lopes,Carlos.
The use of chemical compounds benefits society in a number of ways. Pesticides, for instance, enable foodstuffs to be produced in sufficient quantities to satisfy the needs of millions of people, a condition that has led to an increase in levels of life expectancy. Yet, at times, these benefits are offset by certain disadvantages, notably the toxic side effects of the chemical compounds used. Exposure to these compounds can have varying effects, ranging from instant death to a gradual process of chemical carcinogenesis. There are three stages involved in chemical carcinogenesis. These are defined as initiation, promotion and progression. Each of these stages is characterised by morphological and biochemical modifications and result from genetic and/or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cancer stages; Carcinogenesis evaluation; Chemical carcinogens; Chemical carcinogenesis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400004

Evaluation of the botanical origin of commercial dry bee pollen load batches using pollen analysis: a proposal for technical standardization
Provedor de dados: 42
Autores: Barth,Ortrud M.; Freitas,Alex S.; Oliveira,Érika S.; Silva,Rosana A.; Maester,Fernanda M.; Andrella,Raquel R.S.; Cardozo,Gina M.B.Q.
High quality of bee pollen for commercial purpose is required. In order to attend the consumer with the best identification of the botanical and floral origin of the product, 25 bee pollen batches were investigated using two techniques of pollen grain preparation. The first started to identify pollen loads of different colors in two grams of each well mixed batch, and the second to identify pollen grains in a pool made of all the pollen loads comprised in two grams. The best result was obtained by this last technique, when a pollen grain suspension was dropped on a microscope slide and circa 500 pollen grains were counted per sample. This analysis resulted in the recognition of monofloral and bifloral pollen batches, while the use of the first technique...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis; Pollen loads; Commercial pollen batches; Pollen analysis; Botanical origin.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400011

Bacterial handling under the influence of non-uniform electric fields: dielectrophoretic and electrohydrodynamic effects
Provedor de dados: 42
Autores: Fernádez-Morales,Flavio H.; Duarte,Julio E.; Samitier-Martí,Josep.
This paper describes the modeling and experimental verification of a castellated microelectrode array intended tohandle biocells, based on common dielectrophoresis. The proposed microsystem was developed employing platinumelectrodes deposited by lift-off, silicon micromachining, and photoresin patterning techniques. Having fabricated the microdevice it was tested employing Escherichia coli as bioparticle model. Positive dielectrophoresis could be verified with the selected cells for frequencies above 100 kHz, and electrohydrodynamic effects were observed as the dominant phenomena when working at lower frequencies. As a result, negative dielectrophoresis could not be observed because its occurrence overlaps with electrohydrodynamic effects; i.e. the viscous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dielectrophoresis; Electrohydrodynamic effects; Biochips; Bacterial handling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400004

The influence of bromazepam on cortical power distribution
Provedor de dados: 42
Autores: Sampaio,Isabel; Puga,Fernanda; Veiga,Heloisa; Cagy,Mauricio; Piedade,Roberto; Ribeiro,Pedro.
The EEG has been widely employed in the assessment of electrophysiological changes induced by distinct medications. Its sensibility in detecting alterations produced by a specific substance may be enhanced by methods of quantitative analyses (qEEG). The present study aimed at investigating the modulatory effects of bromazepam on brain dynamics. The effects of bromazepam (3mg) on EEG power distribution were tested in 10 healthy individuals, in a double-blind experiment. The electrophysiological measure was analyzed across experimental conditions, moments, and electrodes, in the delta, theta, alpha and beta frequency bands separately. A significant decrease of relative power was observed in delta and theta (main effect of condition). No interactions were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benzodiazepine; Bromazepam; Quantitative EEG; Relative power; Brain dynamics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200012

Intake, apparent digestibility, rumen fermentation and nitrogen efficiency in sheep fed a tropical legume silage with or without concentrate
Provedor de dados: 42
Autores: SILVA,LEANDRO D. DA; PEREIRA,OODILON G.; SILVA,THIAGO C. DA; VALADARES FILHO,SEBASTIÃO C.; RIBEIRO,KARINA G.; SANTOS,STEFANIE A.
Abstract Legume silage can increase the forage quality of the diets as well as supply it with nitrogen, calcium and phosphorus. The objective was to evaluate the intake, apparent digestibility, rumen fermentation and nitrogen efficiency in sheep fed a tropical legume silage with or without concentrate. Twelve crossbred sheep with an average initial body weight of 32.2 ± 1.26 kg, with six animals cannulated in the rumen were distributed into four 3 × 3 Latin squares. The treatments were 1) Stylosanthes silage without concentrate (StS), 2) Stylosanthes silage with concentrate (StS+C), and 3) corn silage with concentrate (CS+C). StS diet showed lowest intake, except for neutral detergent fiber (NDF). The diets StS+C and CS+C showed similar intake of dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative foods; Corn silage; Crude protein; Neutral detergent fiber; Stylosanthes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703551

Plasma membranes from insect midgut cells
Provedor de dados: 42
Autores: Terra,Walter R.; Costa,Rita H.; Ferreira,Clélia.
Plasma membranes from insect midgut cells are separated into apical and basolateral domains. The apical domain is usually modified into microvilli with a molecular structure similar to other animals. Nevertheless, the microvillar structure should differ in some insects to permit the traffic inside them of secretory vesicles that may budd laterally or pinch-off from the tips of microvilli. Other microvillar modifications are associated with proton-pumping or with the interplay with an ensheathing lipid membrane (the perimicrovilllar membrane) observed in the midgut cells of hemipterans (aphids and bugs). The perimicrovillar membranes are thought to be involved in amino acid absorption from diluted diets. The microvillar and perimicrovillar membranes have...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microvillar membranes; Perimicrovillar membranes; Nutrient absorption; Ion transport; Water transport; Midgut molecular physiology.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200007

The impacts of land use changes in the mercury flux in the Madeira River, Western Amazon
Provedor de dados: 42
Autores: Lacerda,Luiz D.; Bastos,Wanderley R.; Almeida,Marcelo D.
Changes in hydrochemistry and Hg distribution in the Madeira River from Porto Velho to the confluence with the Amazon River were studied in two cruises in 1997 and 2002. Water conductivity was similar in both periods, but the pH was significantly higher in 2002, in particular along the middle reaches of the river. Total suspended matter concentrations also increased from 1997 to 2002 along the same river portion, which is a result of forest conversion to other land uses, in particular pastures and agriculture accelerated during the interval between the cruises. Dissolved Hg concentrations were similar along the river in both cruises, but particulate Hg concentrations increased significantly along the middle portion of the river, although the suspended...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deforestation; Mercury; Hydrochemistry; Contamination; Amazon.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100007

Preparation and evaluation of a biomimetic scaffold with porosity gradients in vitro
Provedor de dados: 42
Autores: Wang,Qianbin; Wang,Qiguang; Wan,Changxiu.
A novel biodegradable scaffold based on mimetic a natural bone tissue morphology with a porosity gradient structure was prepared in this paper. The result of surface morphology indicated that a graded porous structure was formed in the fabricated scaffold, where the dense layer (0%) was connected with the most porous layer (60%) by a middling porous layer (30%). To evaluate the degradability, graded porous scaffolds compared with homogeneous scaffolds were placed into a Tris-HCl buffer solution (pH = 7.4) for 28 days. It was found that both scaffolds presented the same degradation trend, and the graded porous structure did not change the original degradability of the scaffold. Moreover, the compressive strength of the graded porous scaffold was better than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradable; Biomimetic; Graded porous scaffold; Compressive strength.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100003

Action of plant proteinase inhibitors on enzymes of physiopathological importance
Provedor de dados: 42
Autores: Oliva,Maria Luiza V.; Sampaio,Misako U.
Obtained from leguminous seeds, various plant proteins inhibit animal proteinases, including human, and can be considered for the development of compounds with biological activity. Inhibitors from the Bowman-Birk and plant Kunitz-type family have been characterized by proteinase specificity, primary structure and reactive site. Our group mostly studies the genus Bauhinia, mainly the species bauhinioides, rufa, ungulata and variegata. In some species, more than one inhibitor was characterized, exhibiting different properties. Although proteins from this group share high structural similarity, they present differences in proteinase inhibition, explored in studies using diverse biological models.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bowman-Birk; Chymotrypsin; Kunitz inhibitors; Plasma kallikrein; Primary structure; Trypsin.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300023

Metacercariae of Strigeidae Parasitizing Amphibians of the Chaco Region in Argentina
Provedor de dados: 42
Autores: HAMANN,MONIKA I.; FERNÁNDEZ,MARÍA V.; GONZÁLEZ,CYNTHYA E.
Abstract: The goal of the present study was to analyze the metacercariae found in adult amphibians collected in the Argentinean Chaco region. A total of 194 frogs, Leptodactylus chaquensis, Leptodactylus latinasus, and Lepidobatrachus laevis was examined for digeneans. Three different larval trematodes of the genus Strigea (Digenea, Strigeidae) were found infecting the liver, mesentery, body cavity, and muscle of frogs. These metacercariae are described and illustrated for the first time and provide new information on the composition of metacercariae in amphibians, thus contributing to the knowledge of larval trematodes biodiversity in the Neotropical region. We also present new information on the morphology and morphometry of strigeid metacercariae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trematoda; Metacercariae; Amphibian; Argentina.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100624

Antimicrobial and enzymatic activity of anemophilous fungi of a public university in Brazil
Provedor de dados: 42
Autores: SOBRAL,LAUREANA V.; MELO,KELLY N.; SOUZA,CLECIANA M.; SILVA,SÍLVIO F.; SILVA,GILVANIA L.R.; SILVA,ANDRESSA L.F.; WANDERLEY,KATHARINE A.A.; OLIVEIRA,IDJANE S.; CRUZ,ROBERTA.
ABSTRACT To the fungal microbiota the UFPE and biotechnological potential enzymatic and antimicrobial production. Air conditioned environments were sampled using a passive sedimentation technique, the air I ratio and the presence of aflatoxigenic strains evaluated for ANVISA. Icelles were to determine the enzymatic activity of lipase, amylase and protease metabolic liquids to determine antimicrobial activity. Diversity was observed in all CAV environments, CFU/m3 ranged from 14 to 290 and I/E ratio from 0.1 to 1.5. The of the fungal genera were: Aspergillus (50%), Penicillium (21%), Talaromyces (14%), Curvularia and Paecilomyces (7% each). Aspergillus sydowii (Bainier &amp; Sartory) Thom &amp; Church presented enzymatic activity and the Talaromyces...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air quality; Bacteria; Enzymes; Filamentous fungi; Refrigerated environments.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502327

Are sun- and shade-type anatomy required for the acclimation of Neoregelia cruenta?
Provedor de dados: 42
Autores: REINERT,FERNANDA; LEAL-COSTA,MARCOS V.; JUNQUEIRA,NICIA E.; TAVARES,ELIANA S.
Sun and shade plants are often discriminated by a number of sun- and shade-type anatomies. Nonetheless, we propose that among tank-bromeliads, changes in rosette architecture satisfy the requirements for coping with contrasting light levels. The tank-bromeliad Neoregelia cruenta naturally colonises sub-habitats ranging from full exposure to direct sunlight, to shaded environments in sand ridge plains. We quantified anatomical and morphological traits of leaves and rosettes of N. cruenta grown under sun and shade conditions. Cells with undulated lateral walls within the water parenchyma are for the first time described for the family. Under high light, leaf blades were wider, shorter, and yellowish. The rosette diameter of sun plants was less than half that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Crown architecture; Leaf anatomy; Plant morphology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200561

Growth, photosynthetic pigments and production of essential oil of long-pepper under different light conditions
Provedor de dados: 42
Autores: LIMA,VANDIMILLI A.; PACHECO,FERNANDA V.; AVELAR,RAFAELLA P.; ALVARENGA,IVAN C.A.; PINTO,JOSÉ EDUARDO B.P.; ALVARENGA,AMAURI A. DE.
ABSTRACT Piper hispidinervum C. DC. is popularly known as long-pepper and it owns a commercial value due to the essential oil it produces. Long-pepper oil is rich in safrole and eugenoln components that have insecticidal, fungicidal and bactericidal activity. It has been establish that to medicinal plants light influences not only growth but also essential oil production. The growth, the content of photosynthetic pigments and the essential oil production of Piper hispidinervum at greenhouses with different light conditions was evaluated. The treatments were characterized by cultivation of plants for 180 days under different light conditions, produced by shading greenhouses with 50% and 30% of natural incident irradiance, two colored shading nets red (RN)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colored nets; Light quality; Medicinal plants; Safrole.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301167

Antibiotic activity of Plectranthus ornatus Codd., a Traditional Medicinal Plant
Provedor de dados: 42
Autores: NASCIMENTO,FERNANDA R.; ALBUQUERQUE,KAMYLLA R.S.; OLIVEIRA,MARCOS R.; PIZZIOLO,VIRGINIA R.; BRASILEIRO,BEATRIZ G.; DIAZ,GASPAR; DIAZ,MARISA A.N.
ABSTRACT The dichloromethane extract of Plectranthus ornatus Codd., a tradicional medicinal plant, showed antibiotic activity with minimum inhibitory concentration (MIC) values of 0.4 mg.mL-1 and 100 percent of biofilm inhibition against Staphylococcus aureus strains isolated from animals with mastitis infections. Based on these antibacterial activities, in addition to ethnopharmacological reports from healing men and farmers in Brazil, an herbal soap was produced from this active extract and was tested both in vitro and in vivo. In vivo assays conducted on these herbal soaps led to results similar to those previously conducted with the active extract. These results indicated the great potential of this plant for use as an excipient by preparing herbal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine mastitis; Herbal soaps; Plectranthus ornatus; Staphylococcus aureus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502461

Spectral properties and conformal type of surfaces
Provedor de dados: 42
Autores: CASTILLON,PHILIPPE.
In this short note, we announce a result relating the geometry of a riemannian surface to the positivity of some operators on this surface (the operators considered here are of the form surface Laplacian plus a scalar multiple of the curvature function). In particular we obtain a theorem "à la Huber'': under a spectral hypothesis we prove that the surface is conformally equivalent to a Riemann surface with a finite number of points removed. This problem has its origin in the study of stable minimal surfaces.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spectral theory; Minimal surfaces; Stability operator.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400003

A Temnospondyl amphibian from the Rio do Rasto Formation, Upper Permian of southern Brazil
Provedor de dados: 42
Autores: DIAS,ELISEU V.; BARBERENA,MARIO C.
A partially preserved lower jaw constitutes the holotype of Bageherpeton longignathus n. g., n. sp., a probable archegosaurid amphibian, which is here assigned to the Platyoposaurinae. The material was collected in the beds of the Rio do Rasto Formation outcropping in Rio Grande do Sul State, southern Brazil. This is the second archegosaurid described for the Permian of Brazil. Prionosuchus plummeri Price 1948, from the Pedra do Fogo Formation in the Parnaiba Basin (northeastern Brazil), is the first. The new taxon differs from other platyoposaurs by the presence of an extremely elongated precoronoid that participates in the mandibular symphysis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Temnospondyli; Archegosauridae; Platyoposaurinae; Rio do Rasto Formation; Late Permian.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100011

New enamine derivatives of lapachol and biological activity
Provedor de dados: 42
Autores: OLIVEIRA,MAILCAR F.; LEMOS,TELMA L.G.; MATTOS,MARCOS C. DE; SEGUNDO,TACIANA A.; SANTIAGO,GILVANDETE M.P.; BRAZ-FILHO,RAIMUNDO.
A convenient synthesis of the new enamine derivatives 2-(4-morpholinyl)-3-(3-methyl-2-butenyl)-1,4-naphthalenedione, 2-(1-piperidinyl)-3-(3-methyl-2-butenyl)-1,4-naphtalenedione and 2-(1-pyrrolidinyl)-3-(3-methyl-2-butenyl)-1,4-naphthalenedione was carried out from natural 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphthalenedione (lapachol) and morpholine, piperidine and pyrrolidine. The structures of the products were established mainly by NMR analysis, including 2D experiments. Biological activities of these products were evaluated against Artemia salina, Aedes aegypti and cytotoxicity using A549 human breast cells.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lapachol; Enamine derivatives; Biological activities.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200004

Natural decomposition of hornbeam wood decayed by the white rot fungus Trametes versicolor
Provedor de dados: 42
Autores: KARIM,MARYAM; DARYAEI,MEHRDAD GHODSKHAH; TORKAMAN,JAVAD; OLADI,REZA; GHANBARY,MOHAMMAD ALI TAJICK; BARI,EHSAN; YILGOR,NURAL.
ABSTRACT The impacts of white-rot fungi on altering wood chemistry have been studied mostly in vitro. However, in vivo approaches may enable better assessment of the nature of interactions between saprotrophic fungi and host tree in nature. Hence, decayed and sound wood samples were collected from a naturally infected tree (Carpinus betulus L.). Fruiting bodies of the white rot fungus Trametes versicolor grown on the same tree were identified using rDNA ITS sequencing. Chemical compositions (cellulose and lignin) of both sound and infected wood were studied. FT-IR spectroscopy was used to collect spectra of decayed and un-decayed wood samples. The results of chemical compositions indicated that T. versicolor reduced cellulose and lignin in similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hornbeam wood; Trametes versicolor; Chemical compositions; FT-IR analyses.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602647

Ostracoda and foraminifera from Paleocene (Olinda well), Paraíba Basin, Brazilian Northeast
Provedor de dados: 42
Autores: PIOVESAN,ENELISE K.; MELO,ROBBYSON M.; LOPES,FERNANDO M.; FAUTH,GERSON; COSTA,DENIZE S.
ABSTRACT Paleocene ostracods and planktonic foraminifera from the Maria Farinha Formation, Paraíba Basin, are herein presented. Eleven ostracod species were identified in the genera Cytherella Jones, Cytherelloidea Alexander, Eocytheropteron Alexander, Semicytherura Wagner, Paracosta Siddiqui, Buntonia Howe, Soudanella Apostolescu, Leguminocythereis Howe and, probably, Pataviella Liebau. The planktonic foraminifera are represented by the genera Guembelitria Cushman, Parvularugoglobigerina Hofker, Woodringina Loeblich and Tappan, Heterohelix Ehrenberg, Zeauvigerina Finlay, Muricohedbergella Huber and Leckie, and Praemurica Olsson, Hemleben, Berggren and Liu. The ostracods and foraminifera analyzed indicate an inner shelf paleoenvironment for the studied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Ostracods; Paleocene; Paraíba Basin; Foraminifera.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401443

Natural occurrence of hexavalent chromium in a sedimentary aquifer in Urânia, State of São Paulo, Brazil
Provedor de dados: 42
Autores: Bourotte,Christine; Bertolo,Reginaldo; Almodovar,Marta; Hirata,Ricardo.
Anomalous concentrations of hexavalent chromium have been detected in ground-water of the Adamantina Aquifer inat least 54 municipalities located in the northwestern region of the State of São Paulo, southeast Brazil, occasionallyexceeding the permitted limit for human consumption (0.05 mg.L-1). An investigation was conducted in the municipality of Urânia, where the highest concentrations of chromium were detected regionally. It was defined that the originof this contamination is natural, since high concentrations of chromium were detected in aquifer sandstones (averageof 221 ppm) and also in pyroxenes (6000 ppm), one of the main heavy minerals found in the sediments. Besides, noother possible diffuse or point sources of contamination were observed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Ground-water; Aquifer; Natural contamination.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200009

Sampling procedures for inventory of commercial volume tree species in Amazon Forest
Provedor de dados: 42
Autores: NETTO,SYLVIO P.; PELISSARI,ALLAN L.; CYSNEIROS,VINICIUS C.; BONAZZA,MARCELO; SANQUETTA,CARLOS R.
ABSTRACT The spatial distribution of tropical tree species can affect the consistency of the estimators in commercial forest inventories, therefore, appropriate sampling procedures are required to survey species with different spatial patterns in the Amazon Forest. For this, the present study aims to evaluate the conventional sampling procedures and introduce the adaptive cluster sampling for volumetric inventories of Amazonian tree species, considering the hypotheses that the density, the spatial distribution and the zero-plots affect the consistency of the estimators, and that the adaptive cluster sampling allows to obtain more accurate volumetric estimation. We use data from a census carried out in Jamari National Forest, Brazil, where trees with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptive cluster sampling; Spatial species distribution; Volume estimation; Zero-plots.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401829

Carlos Chagas Filho, scientist and citizen
Provedor de dados: 42
Autores: ALMEIDA,DARCY FONTOURA DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300002

Allosteric regulation of 6-phosphofructo-1-kinase activity of fat body and flight muscle from the bloodsucking bug Rhodnius prolixus
Provedor de dados: 42
Autores: Alves,Gutemberg G.; Marinho-Carvalho,Monica M.; Atella,Georgia C.; Silva-Neto,Mario A.C.; Sola-Penna,Mauro.
6-phosphofructo-1-kinase (phosphofructokinase; PFK) activity from Rhodnius prolixus, a haematophagous insect which is usually a poor flyer, was measured and compared in two metabolically active tissues - flight muscle and fat body. The activity of this important regulatory glycolytic enzyme was much more pronounced in muscle (15.1 ± 1.4 U/mg) than in fat body extracts (3.6±0.4 U/mg), although the latter presented higher levels of enzyme per protein content, as measured by western-blotting. Muscle extracts are more responsible than fat body to ATP and fructose 6-phosphate, both substrates of PFK. Allosteric regulation exerted by different effectors such as ADP, AMP and fructose 2,6-phosphate presented a singular pattern for each tissue. Optimal pH (8.0-8.5)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphofructokinase; Metabolism; Insect.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100008

Reproductive biology of a bromeligenous frog endemic to the Atlantic Forest: Aparasphenodon arapapa Pimenta, Napoli and Haddad, 2009 (Anura: Hylidae)
Provedor de dados: 42
Autores: LANTYER-SILVA,AMANDA S.F.; SOLÉ,MIRCO; ZINA,JULIANA.
The genus Aparasphenodon is restricted to South America and comprises five poorly studied species which present a straight relationship with bromeliads. Herein we present the reproductive biology of the species Aparasphenodon arapapa. Our observations indicate that A. arapapa is a prolonged breeder, reproducing throughout the year using bromeliads as a calling and breeding site. The tadpoles complete their development inside those plants. Males, females and juveniles may also use the bromeliads as a shelter. We also describe the courtship behavior and the parental care of the species with an evidence of temporary fidelity between male and female and propose a new reproductive mode.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproductive mode; Oophagy; Parental care; Bromeliad.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200867

Importance of CD8 T cell-mediated immune response during intracellular parasitic infections and its implications for the development of effective vaccines
Provedor de dados: 42
Autores: Rodrigues,Mauricio M.; Boscardin,Silvia B.; Vasconcelos,José R.; Hiyane,Meire I.; Salay,Gerson; Soares,Irene S.
Obligatory intracellular parasites such as Plasmodium sp, Trypanosoma cruzi, Toxoplasma gondii and Leishmania sp are responsible for the infection of hundreds of millions of individuals every year. These parasites can deliver antigens to the host cell cytoplasm that are presented through MHC class I molecules to protective CD8 T cells. The in vivo priming conditions of specific CD8 T cells during natural infection are largely unknown and remain as an area that has been poorly explored. The antiparasitic mechanisms mediated by CD8 T cells include both interferon-g-dependent and -independent pathways. The fact that CD8 T cells are potent inhibitors of parasitic development prompted many investigators to explore whether induction of these T cells can be a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CD8; Parasites; Immunity; Vaccine.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400005

Food restriction beginning at lactation interferes with the cellular dynamics of the mucosa and colonic myenteric innervation in adult rats
Provedor de dados: 42
Autores: SCHOFFEN,JOÃO PAULO F.; VICENTINI,FERNANDO A.; MARCELINO,CAROLINA G.; ARAÚJO,EDUARDO J.A.; PEDROSA,MARIA M.D.; NATALI,MARIA R.M.
The effects of food restriction (FR) on the morphoquantitative aspects of the wall and myenteric neurons of the proximal colon in adult rats were analysed. FR was imposed by duplication of the experimental brood size in relation to the control brood during lactation. The FR group received a 50% reduction of food from weaning until 90 days of age. Samples of the colon underwent histological processing to morphometrically analyze the crypts, muscularis mucosae, tunica mucosa, and muscularis externa. We determined the number of goblet cells and serotoninergic enteroendocrine cells, and morphoquantitatively studied the myenteric neuronal population. FR caused hypertrophy in the tunica mucosa, increase in crypt depth and in the muscular layer of the mucosa, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enteroendocrine cells; Food restriction; Goblet cells; Intestinal morphology; Myenteric neurons; Serotonin.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401833

A new Cretaceous terrestrial ecosystem from Gondwana with the description of a new sauropod dinosaur
Provedor de dados: 42
Autores: Calvo,Jorge O.; Porfiri,Juan D.; González-Riga,Bernardo J.; Kellner,Alexander W.A.
A unique site at the northern area of Patagonia (Neuquén, Argentina) reveals a terrestrial ecosystem preserved in a detail never reported before in a Late Cretaceous deposit. An extraordinary diversity and abundance of fossils was found concentrated in a 0.5 m horizon in the same quarry, including a new titanosaur sauropod, Futalognkosaurus dukei n.gen., n.sp, which is the most complete giant dinosaur known so far. Several plant leaves, showing a predominance of angiosperms over gymnosperms that likely constituted the diet of F. dukei were found too. Other dinosaurs (sauropods, theropods, ornithopods), crocodylomorphs, pterosaurs, and fishes were also discovered, allowing a partial reconstruction of this Gondwanan continental ecosystem.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinosauria; Titanosauria; Ecosystem; Taphonomy; Upper Cretaceous; Gondwana; Patagonia; Argentina.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300013

Disaggregases, molecular chaperones that resolubilize protein aggregates
Provedor de dados: 42
Autores: Mokry,David Z.; Abrahão,Josielle; Ramos,Carlos H.I.
The process of folding is a seminal event in the life of a protein, as it is essential for proper protein function and therefore cell physiology. Inappropriate folding, or misfolding, can not only lead to loss of function, but also to the formation of protein aggregates, an insoluble association of polypeptides that harm cell physiology, either by themselves or in the process of formation. Several biological processes have evolved to prevent and eliminate the existence of non-functional and amyloidogenic aggregates, as they are associated with several human pathologies. Molecular chaperones and heat shock proteins are specialized in controlling the quality of the proteins in the cell, specifically by aiding proper folding, and dissolution and clearance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amyloid; Disaggregase; Shock protein; Molecular chaperones; Prion; Protein folding.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301273

Science communication podcasting in Brazil: the potential and challenges depicted by two podcasts
Provedor de dados: 42
Autores: DANTAS-QUEIROZ,MARCOS V.; WENTZEL,LIA C.P.; QUEIROZ,LUCIANO L.
ABSTRACT Podcasts - online distributed audio files - are easy access and production media, which can be used for Scientific Communication (SC) but few are presented in Portuguese. The objective of this work is to perform a case study with data from a survey for two Brazilian SC podcasts (Dragões de Garagem and Fronteiras da Ciência) to evaluate the increase of science podcast media in Brazil, the involved potential, their advantages, shortcomings, and perspectives. We noted an increase of listeners over the years, probably due to the internet popularization and the massive increase of mobile phones. Scientific content is underexplored, despite the great interest of the public. Humorous and informal podcasts are the most appealing to the public and they...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Internet; Podcast; Science communication; Online survey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401891

Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
Provedor de dados: 42
Autores: PONTES-BUARQUE,MILA; TESSIS,ANA C.; BONAPACE,JOSÉ A. P.; MONTE,MARISA B. M.; SOUZA-BARROS,FERNANDO DE; VIEYRA,ADALBERTO.
There exists an extensive literature on the possible roles of minerals in the prebiotic stages of the chemical evolution of life (Bernal 1951, Cairns-Smith 1982, Wächtershäuser 1992, Vieyra et al. 1995, Tessis et al. 1999, see Lahav (1994) for a review). Among the original proposals, minerals have been considered in: (a) processes that would discriminate molecular chirality; (b) condensation reactions of biomolecular precursors; (c) prebiotic catalysis; (d) biochemical templates; and (e) autocatalytic metabolism. In this communication it is emphazised the complex properties of both surface reactions and interfaces between minerals and aqueous solutions simulating Archean scenarios. The properties of pyrite surface net charge and of its interface with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prebiotic reactions; Mineral interfaces; Surface reactions.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300005

Maximum principles for hypersurfaces with vanishing curvature functions in an arbitrary Riemannian manifold
Provedor de dados: 42
Autores: FONTENELE,FRANCISCO X.; SILVA,SÉRGIO L.
In this paper we generalize and extend to any Riemannian manifold maximum principles for Euclidean hypersurfaces with vanishing curvature functions obtained by Hounie-Leite.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maximum principle; Hypersurface; Rth mean curvature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200002

Synthesis of Chiral 1,3-Dienes through Ring-Closing Metathesis of Enantioenriched Enynes: Potential Precursors of Morphane Analogs
Provedor de dados: 42
Autores: GARCIA-MUÑOZ,MARÍA JESÚS; SIRVENT,ANA; FOUBELO,FRANCISCO; YUS,MIGUEL.
ABSTRACT A simple methodology for the synthesis of enynes by indium mediated diastereoselective allylation of aromatic N-tert-butanesulfinylimines bearing alkenyl groups at ortho-position with allyl bromide has been developed. The addition of the allyl indium intermediate to the chiral imine took place with excellent diastereoselectivity. Ruthenium-catalyzed ring-closing metathesis of the resulting enynes provided the expected cyclic 1,3-dienes in good to moderate yields. These chiral dienes are potential precursors of biologically and pharmacologically active morphane derivatives.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allylation; Imines; Dienes; Enynes; Metathesis; Alkaloids.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301059

Effects of low-intensity pulsed ultrasound exposure on rats tibia periosteum
Provedor de dados: 42
Autores: Batista,Jaqueline Martins; Nakagaki,Wilson Romero; Soares,Evelise Aline; Camilli,José Angelo.
Abstract  The periosteum is a rich source of osteoprogenitor cells and periosteal grafts can be used as an alternative method to replace bone grafts. The low-intensity pulsed ultrasound (LIPUS) has often been used as a noninvasive method to stimulate osteogenesis and reduce the fracture healing time. The aim of this study was to evaluate the effects of the ultrasound exposure on the rat tibia periosteum. Group I (7 animals) received LIPUS therapy on the left tibia for 7 days and group II (7 animals) on the left tibia for 14 days. After euthanasia, the tibias were processed. Number of periosteal cells and vessels and thickness of the periosteum were analyzed. The number of periosteal cells was higher in stimulated periosteum compared to controls at 7 and 14...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tibia; Blood vessels; Periosteal cells; Periosteum; Low-intensity pulsed ultrasound.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100901

Screening of melon genotypes for resistance to vegetable leafminer and your phenotypic correlations with colorimetry
Provedor de dados: 42
Autores: OLIVEIRA,FREDERICO I.C. DE; FIEGE,LEONARDO B.C.; CELIN,ELAINE F.; INNECCO,RENATO; NUNES,GLAUBER H.S.; ARAGÃO,FERNANDO A.S. DE.
ABSTRACT Melon is one of the most important vegetable crops in the world. With short cycle in a system of phased planting, phytosanitary control is compromised, and a great volume of agricultural chemicals is used to control vegetable leafminer. Genetic control is an ideal alternative to avoid the damage caused by this insect. Thus, the aim of this study was to evaluate Cucumis accessions in regard to resistance to leafminer and correlate the variables analyzed. Fifty-four accessions and four commercial hybrids of melon were tested. The study was divided into two experiments: with and with no choice. The following characteristics were evaluated: with choice, in field - subjective score based on the infestation and the number of mines per leaf; and with no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Germplasm; Liriomyza sativae; Lab system.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301155

Dimeric and dipolar ground state orders in colloidal molecular crystals
Provedor de dados: 42
Autores: Trizac,Emmanuel; El Shawish,Samir; Dobnikar,Jure.
A two dimensional colloidal suspension subject to a periodic substrate evolves into a colloidal molecular crystal under situationsofstrongconfinement. Wefocusonthelongrangeorientationalordertherebyemerging, inthegroundstate. We study by simulations the situations where in each trap lies a pair of identical colloids, or alternatively a pair of oppositelychargedmacroions. We consider square or triangular geometries for the periodic confinement, together with less symmetric distorted lattices.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloidal molecular crystals; Confined colloidal suspensions; Orientational ordering; Screened Coulomb interactions; Simulated annealing.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100008

On the geographical differentiation of Gymnodactylus geckoides Spix, 1825 (Sauria, Gekkonidae): speciation in the Brasilian caatingas
Provedor de dados: 42
Autores: Vanzolini,Paulo Emilio.
The specific concept of G. geckoides was initially ascertained based on a topotypical sample from Salvador, Bahia. Geographic differentiation was studied through the analysis of two meristic characters (tubercles in a paramedian row and fourth toe lamellae) and color pattern of 327 specimens from 23 localities. It is shown that the population from the southernmost locality, Mucugê, is markedly divergent in all characters studied. A Holocene refuge model is proposed to explain the pattern. A decision about the rank to be attributed to the Mucugê population is deferred until more detailed sampling is effected and molecular methods are applied.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Speciation; Holocene refuges; Lizards/ecology; Lizards/systematics.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400005

Corn grain yield and 15N-fertilizer recovery as a function of urea sidedress timing
Provedor de dados: 42
Autores: SCHONINGER,EVANDRO L.; VILLALBA,HUGO A. GONZÁLEZ; BENDASSOLLI,JOSÉ ALBERTINO; TRIVELIN,PAULO CESAR O.
Abstract Best fertilizer management practices such as adopting the right N sidedress timing can reduce N losses by volatilization, thus, raising N-fertilizer recovery and grain yield. To evaluate ammonia (N-NH3 ) losses, N-fertilizer recovery and grain yield as a function of urea sidedress timing in corn, a field study was conducted during the 2011-2012 and 2012-2013 growing seasons, adopting a complete randomized block design with four replications. Treatments consisted of urea sidedress timing (140 kg N ha-1) at V4, V6, V8, V10, and V12 growth stages, plus a control without sidedress N. The largest N losses by N-NH3 volatilization occurred when urea was applied at V10 or V12 growth stages, reaching losses of 35 and 41 % of the total applied N. Although...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N isotope; Nitrogen fertilization; Nitrogen volatilization; Zea mays.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703299

Activity of Brazilian propolis against Aeromonas hydrophila and its effect on Nile tilapia growth, hematological and non-specific immune response under bacterial infection
Provedor de dados: 42
Autores: ORSI,RICARDO O.; SANTOS,VIVIAN G. DOS; PEZZATO,LUIZ E.; CARVALHO,PEDRO L.P.F. DE; TEIXEIRA,CAROLINE P.; FREITAS,JAKELINE M.A.; PADOVANI,CARLOS R.; SARTORI,MARIA M.P.; BARROS,MARGARIDA M.
ABSTRACT The effect of the ethanolic extract of propolis (EEP) on Aeromonas hydrophila was analyzed by determination of minimum inhibitory concentration (MIC). Then, the effects of crude propolis powder (CPP) on growth, hemato-immune parameters of the Nile tilapia, as well as its effects on resistance to A. hydrophila challenge were investigated. The CPP (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0%) was added to the diet of 280 Nile tilapia (50.0 ± 5.7 g fish-1). Hemato-immune parameters were analyzed before and after the bacterial challenge. Red blood cell, hematocrit, hemoglobin, mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), and hydrogen peroxide (H2O2) and nitric oxide (NO) were evaluated. The MIC of the EEP was 13% (v/v) with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Health; Hematology; Immunology; Oreochromis niloticus; Propolis; Stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401785

Wave onset in central gray matter - its intrinsic optical signal and phase transitions in extracellular polymers
Provedor de dados: 42
Autores: FERNANDES-DE-LIMA,VERA M.; KOGLER,JOÃO E.; BENNATON,JOCELYN; HANKE,WOLFGANG.
The brain is an excitable media in which excitation waves propagate at several scales of time and space. ''One-dimensional'' action potentials (millisecond scale) along the axon membrane, and spreading depression waves (seconds to minutes) at the three dimensions of the gray matter neuropil (complex of interacting membranes) are examples of excitation waves. In the retina, excitation waves have a prominent intrinsic optical signal (IOS). This optical signal is created by light scatter and has different components at the red and blue end of the spectrum. We could observe the wave onset in the retina, and measure the optical changes at the critical transition from quiescence to propagating wave. The results demonstrated the presence of fluctuations preceding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intrinsic optic signals; Volume phase transitions; Polymers; Spreading depression; Central gray matter; Extracellular matrix.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300006

Modeling the reflection of Photosynthetically active radiation in a monodominant floodable forest in the Pantanal of Mato Grosso State using multivariate statistics and neural networks
Provedor de dados: 42
Autores: CURADO,LEONE F.A.; MUSIS,CARLO R. DE; CUNHA,CRISTIANO R. DA; RODRIGUES,THIAGO R.; PEREIRA,VINICIUS M.R.; NOGUEIRA,JOSÉ S.; SANCHES,LUCIANA.
ABSTRACT The study of radiation entrance and exit dynamics and energy consumption in a system is important for understanding the environmental processes that rule the biosphere-atmosphere interactions of all ecosystems. This study provides an analysis of the interaction of energy in the form of photosynthetically active radiation (PAR) in the Pantanal, a Brazilian wetland forest, by studying the variation of PAR reflectance and its interaction with local rainfall. The study site is located in Private Reserve of Natural Heritage, Mato Grosso State, Brazil, where the vegetation is a monodominant forest of Vochysia divergens Phol. The results showed a high correlation between the reflection of visible radiation and rainfall; however, the behavior was not the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal; Photosynthetically active radiation (PAR); Cambarazal; Albedo.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401387

Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga Mining District area, Amazonian Craton, Brazil: insights in ancient volcanic processes from field and petrologic data
Provedor de dados: 42
Autores: Pierosan,Ronaldo; Lima,Evandro F.; Nardi,Lauro V.S.; Campos,Cristina P. de; Bastos Neto,Artur C.; Ferron,José M.T.M.; Prado,Maurício.
The Iricoumé Group correspond to the most expressive Paleoproterozoic volcanism in the Guyana Shield, Amazonian craton. The volcanics are coeval with Mapuera granitoids, and belong to the Uatumã magmatism. They have U-Pb ages around 1880 Ma, and geochemical signatures of α-type magmas. Iricoumé volcanics consist of porphyritic trachyte to rhyolite, associated to crystal-rich ignimbrites and co-ignimbritic fall tuffs and surges. The amount and morphology of phenocrysts can be useful to distinguish lava (flow and dome) from hypabyssal units. The morphology of ignimbrite crystals allows the distinction between effusive units and ignimbrite, when pyroclasts are obliterated. Co-ignimbritic tuffs are massive, and some show stratifications that suggest deposition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian Craton; Caldera complex; Ignimbrite; Iricoumé volcanism; Surge deposits; Uatumã magmatism.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300012

In vitro antifungal activity of four chemotypes of Lippia alba (Verbenaceae) essential oils against Alternaria solani (Pleosporeaceae) isolates
Provedor de dados: 42
Autores: TOMAZONI,ELISA Z.; PANSERA,MÁRCIA R.; PAULETTI,GABRIEL F.; MOURA,SIDNEI; RIBEIRO,RUTE T.S.; SCHWAMBACH,JOSÉLI.
Several volatile natural compounds produced by plant secondary metabolism have been proven to present antimicrobial action, enabling their use in phytopathogen control. They also present low environmental impact when compared to conventional pesticides. Essential oils contain these compounds and can be found in several plant species, such as Lippia alba (Mill.) N.E. Brown (Verbenaceae). Essential oils of four chemotypes of L. alba, characterized by their major compounds, namely camphor, citral, linalool and camphor/1,8-cineole, were tested against the phytopathogen Alternaria solani Sorauer (Pleosporaceae), which causes early blight on tomatoes and is responsible for great economic losses regarding production. Essential oils antifungal action was tested in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citral; Early blight; Natural product; Phytopathogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300999

Erratum
Provedor de dados: 42
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603223

Synthesis and evaluation of arylamidine derivatives for new antimicrobial and cytotoxic activities
Provedor de dados: 42
Autores: MONTE,ZENAIDE S.; SILVA,AMANDA M.; LIMA,GLÁUCIA M.S.; SILVA,TERESINHA G. DA; MARQUES,KARLA M.R.; RODRIGUES,MARIA D.; FALCÃO,EMERSON P.S.; MELO,SEBASTIÃO J.
ABSTRACT A series of arylamidines 3a-j was designed, synthesized and investigated for antimicrobial activity. Structures of the compounds were confirmed by IR, 1H-NMR and 13C-NMR and a 2D spectroscopic study was performed. A preliminary screening of the antimicrobial tests clearly showed that three out of ten arylamidines, viz, 3f, 3g and 3i, were effective against all the gram-negative bacteria: Klebsiella pneumoniae, Pseudomonas aeruginosa and Salmonella enteric; and against the yeast, candida albicans. Further, the Minimum Inhibitory Concentrations (MIC) against the bacteria and yeast were determined. All compounds 3a-d, 3f, 3g, 3i and 3j were also investigated for their low cytotoxic effects on tested cell lines. Compounds 3d and 3f were the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arylamidines; 2D spectroscopy; Gram-negative bacteria; Yeast; Cytotoxicity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301051

Investigation of potential biomarkers for the early diagnosis of cellular stability after the exposure of agricultural workers to pesticides
Provedor de dados: 42
Autores: ALVES,JODEL S.; SILVA,FERNANDA R. DA; SILVA,GABRIELI F. DA; SALVADOR,MIRIAN; KVITKO,KÁTIA; ROHR,PAULA; SANTOS,CARLA E.I. DOS; DIAS,JOHNNY F.; HENRIQUES,JOÃO A.P.; SILVA,JULIANA DA.
ABSTRACT Agricultural workers involved in the harvest of tobacco crops are regularly exposed to large quantities of pesticides. In order to determine how this exposure to pesticides induces genetic alterations in these workers, blood samples were obtained from 77 exposed individuals, as well as from 60 unexposed subjects. DNA damage was analyzed by the Comet assay and by the micronucleus (MN) test. The antioxidant profile was evaluated by activity of superoxide dismutase (SOD), and the polymorphism of gene PON1 was used as a susceptibility biomarker. The content of inorganic elements in the blood samples was determined by PIXE analysis. Our results demonstrated that the damage frequency, damage index, the MN frequency, and the SOD activity were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticides; Comet assay; Micronucleus test; Superoxide dismutase activity; PON1 gene.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100349

Deformation of Mitochondrial Cristae in Human Neural Progenitor Cells Exposed to Valproic Acid
Provedor de dados: 42
Autores: COSTA,RODRIGO M. DA; KARMIRIAN,KARINA; REHEN,STEVENS K.
ABSTRACT Neural development represents a dynamic process where mitochondrial integrity is decisive for neuronal activity. Structural changes in these organelles may be related to neurological disorders. Valproic acid (VPA) is an anticonvulsive drug commonly used for epilepsy treatment and its use is associated to increased risk of neuropsychiatric disorders. Recently we showed changes in shape and membrane potential in mitochondria from human neural progenitor cells (NPCs) exposed to VPA (da Costa et al. 2015). Here, we applied transmission electron microscopy and electron tomography to evaluate mitochondrial damage caused by VPA in NPCs. Results showed mitochondrial cristae disorganization in a dose dependent manner. Disturbance in mitochondrial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transmission electron microscopy; Mitochondria; Valproic acid; Epilepsy; Human neural progenitor cells; Electron tomography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502223

Interpretation of the stiffness and permeability of Sand-Kaolin mixtures in the framework of homogenization
Provedor de dados: 42
Autores: Boutin,Claude; Kacprzak,Gregory; Doanh,Thiep.
This study deals with the behaviour of mixtures of sand and saturated kaolin paste considered as composite materials made of permeable and deformable (with non-linear behaviour) matrix (the kaolin paste) with rigid and impervious inclusions (the sand grains). Oedometric and permeability tests conducted on such mixtures highlight the key role of the state of the clay paste, and show the existence of a threshold of sand grain concentration above which a structuring effect influences both modulus and permeability. At the light of these experiments, the usual and tangent homogenization process (with simplifying assumptions to make the problem manageable) has been applied to estimate the mixture permeability and tangent compressibility. Qualitative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homogenization; Non-linear behaviour; Sand-clay mixtures; Permeability; Tangent modulus; Compaction; Hardening.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100017

Physiological and biochemical changes during the loss of desiccation tolerance in germinating Adenanthera pavonina L. seeds
Provedor de dados: 42
Autores: SOARES,GIULIANA C.M.; DIAS,DENISE C.F.S.; FARIA,JOSÉ M.R.; BORGES,EDUARDO E.L.
ABSTRACT We investigated the loss of desiccation tolerance (DT) in Adenanthera pavonina seeds during germination. Seeds were subjected to imbibition for 0, 24, 36, 48, 60 and 81 h, then dried to their initial moisture content (13%), rehydrated and evaluated for survival (resumption of growth and development of normal seedlings) and membrane system integrity (electrolyte leakage). Embryonic axes of seeds subjected only to imbibition during the same early time periods were used to investigate the electrophoretic patterns of heat-stable proteins and the relative nuclear DNA content. In A. pavonina seeds, DT remained unchanged until 36 h of imbibition (resulting in germination and 82% normal seedlings), after which it was progressively lost, and seeds with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell cycle; Desiccation sensitivity; DNA content; Drying; Heat-stable proteins.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502001

Changes in adipose cells of Longissimus dorsi muscle in Iberian pigs raised under extensive conditions
Provedor de dados: 42
Autores: AYUSO,DOLORES; GONZÁLEZ,ANA; PEÑA,FRANCISCO; IZQUIERDO,MERCEDES.
ABSTRACT Twenty-four Iberian castrated male pigs were used to characterize and evaluate the effect of the duration of “Montanera” in the adipocytes size and its relation with the backfat thickness and intramuscular fat. The animals were fed under extensive conditions during 30, 60 and 90 days in the “Dehesa” before slaughtered. Carcass weight, percentage of intramuscular fat, thickness of backfat and its three layers and adipocytes size of the intramuscular fat were obtained. The group which expended 90 days on fattening obtained the highest adipocytes, with an area higher by a 50% than those that only expended 30 days. The differences in diameter and perimeter adipocyte were not as marked as area. A significant positive correlation between the diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extensive; Adipocyte; Backfat thickness; Intramuscular fat.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100247

The role of natural products in modern drug discovery.
Provedor de dados: 42
Autores: CALIXTO,JOÃO B.
Abstract: The global medicine market is about 1.1 trillion US dollars. About 35 percent of medicines have originated from natural products. Brazil presents the largest biodiversity in the world, with more than 50,000 species of higher plants. However, few innovative products have been developed in Brazil from active constituents derived from the Brazilian biodiversity. Scientific evidences on plants and venoms have been internationally published by Brazilian scientists over the last 4 decades; but few examples of innovative products are commercially available. Few examples include the anti-hypertensive drug captopril first identified in the venom of the Brazilian viper Bothrops jararaca by Professor Sergio Ferreira; and some phytotherapeutic agents such as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian biodiversity; New drug development; Drug discovery; Cosmetic.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600603

Approaches to the mechanisms of song memorization and singing provide evidence for a procedural memory
Provedor de dados: 42
Autores: Hultsch,Henrike; Todt,Dietmar.
There is growing evidence that, during song learning, birds do not only acquire 'what to sing' (the inventory of behavior), but also 'how to sing' (the singing program), including order-features of song sequencing. Common Nightingales Luscinia megarhynchos acquire such serial information by segmenting long strings of heard songs into smaller subsets or packages, by a process reminiscent of the chunking of information as a coding mechanism in short term memory. Here we report three tutoring experiments on nightingales that examined whether such 'chunking' was susceptible to experimental cueing. The experiments tested whether (1) 'temporal phrasing' (silent intersong intervals spaced out at particular positions of a tutored string), or (2) 'stimulus novelty'...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Song learning; Procedural memory; Song sequencing; Short-term memory; Chunking.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200005

Phytoplankton abundance, dominance and coexistence in an eutrophic reservoir in the state of Pernambuco, Northeast Brazil
Provedor de dados: 42
Autores: Lira,Giulliari A. S. T.; Araújo,Elcida L.; Bittencourt-Oliveira,Maria Do Carmo; Moura,Ariadne N.
The present study reports the phytoplankton abundance, dominance and co-existence relationships in the eutrophic Carpina reservoir, Pernambuco, Brazil. Sampling was carried out at six different depths bimonthly at a single reservoir spanning two climatic periods: dry season (January, September, and November 2006) and rainy season (March, May, and July 2006). Density, abundance, dominance, specific diversity and equitability of the community were determined, along with chlorophyll a, and physical and chemical variables of the environment. Eight species were considered abundant, and their densities corresponded to more than 90% of the total phytoplankton community quantified. Cyanobacteria represented more than 80% of this density. Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carpina reservoir; Cylindrospermopsis raciborskii; Cyanobacteria; Limnological characteristics; Phytoplankton structure; Vertical distribution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400018

Capture techniques' use of Caranguejo-uçá crabs (Ucides cordatus) in Paraíba state (northeastern Brazil) and its socio-environmental implications
Provedor de dados: 42
Autores: Nascimento,Douglas M.; Ferreira,Emmanoela N.; Bezerra,Dandara M.M.S.Q.; Rocha,Pollyana D.; Alves,Rômulo R.N.; Mourão,José S.
The present study was undertaken in two traditional communities that are located on the margins of the estuary and mangrove complex of the Mamanguape River, Paraíba state (PB), Brazil. This work describes the crabs capture techniques tapamento and redinha, and identifies the negative socio-environmental impacts of redinha, using qualitative methods (open and semi-structured interviews, guided tours, direct observation and the administration of questionnaires). Results indicate that currently only two principle techniques are used to capture Ucides cordatus: redinha and tapamento. Tapamento has a low impact in relation to redinha. Redinha was pointed out by interviewees as a system that has social impact (social conflicts, breaking of traditions,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crab catchers; Harvesting techniques; Mangrove; Traditional knowledge.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400019

Does mating interfere in the biological characteristics of a population of Trichogramma pretiosum?
Provedor de dados: 42
Autores: PRATISSOLI,DIRCEU; KLOSS,THIAGO G.; ZINGER,FERNANDO D.; CARVALHO,JOSÉ R. DE; VIANNA,ULYSSES R.; PAES,JOÃO P.P.
Trichogramma spp. are parasitoids used in the regulation of insect populations that can cause economic damage. In order to ensure good performance, understanding some of their biological characteristics is essential. The objective of this study is to evaluate whether mating interferes with the biological characteristics of a population of Trichogramma pretiosum collected in the field. In all experiments, groups of mated and unmated females were used. We also verified any interference from mating on the biological characteristics of the offspring. We found that mating can alter the parasitism and longevity of genitor females, in addition to changing longevity among the descendants, but once parasitized, the eggs develop normally, showing similar emergence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg parasitoids; Mating; Telytokous; Arrhenotokous.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100459

Persistence of auxinic herbicides applied on pasture and toxicity for succeeding crops
Provedor de dados: 42
Autores: ANÉSIO,ARNON H.C.; SANTOS,MÁRCIA V.; SILVEIRA,RAUL R.; FERREIRA,EVANDER A.; SANTOS,JOSÉ B. DOS; SILVA,LEANDRO D. DA.
ABSTRACT The aim of this work was to determine the persistence of auxinic herbicides applied on tropical pasture and toxicity for succeeding crops. The herbicides were applied in an area of dystrophic red‒yellow latosol with pasture infested of weeds. At 40, 80, and 280 days after application of herbicide, the soil samples were collected at depths of 0 to 20 cm. Soil with residues of 2,4-D, 2,4-D + picloram, triclopyr, and a soil without herbicide application were analyzed with six replicates. Seven crops were cultivated in these soils: cucumber (Cucumis sativus L.), velvet bean [Mucuna pruriens (L.) DC.], pigeon pea [Cajanus cajan (L.) Millsp.], alfalfa (Medicago sativa L.), lablab bean [Lablab purpureus (L.) Sweet], corn (Zea mays L.), and sorghum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth regulator herbicide residue 2; 4-D picloram triclopyr.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401717

Nanotechnology and lung diseases, caterpillars and agriculture, a new fossil turtle egg type from China, and a giant flying reptile from Gondwana
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100001

The Extended Log-Logistic Distribution: Properties and Application
Provedor de dados: 42
Autores: LIMA,STÊNIO R.; CORDEIRO,GAUSS M.
Abstract We propose a new four-parameter lifetime model, called the extended log-logistic distribution, to generalize the two-parameter log-logistic model. The new model is quite flexible to analyze positive data. We provide some mathematical properties including explicit expressions for the ordinary and incomplete moments, probability weighted moments, mean deviations, quantile function and entropy measure. The estimation of the model parameters is performed by maximum likelihood using the BFGS algorithm. The flexibility of the new model is illustrated by means of an application to a real data set. We hope that the new distribution will serve as an alternative model to other useful distributions for modeling positive real data in many areas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exponentiated generalize; Generating function; Log-logistic distribution; Maximum likelihood estimation; Momen.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100003

Active caspase-3 expression levels as bioindicator of individual radiosensitivity
Provedor de dados: 42
Autores: SANTOS,NEYLIANE F.G. DOS; SILVA,RAFAEL F.; PINTO,MARCELA M.P.L.; SILVA,EDVANE B. DA; TASAT,DEBORAH R.; AMARAL,ADEMIR.
ABSTRACT Several molecules and events involved in cell response to radiation-induced damage have been investigated towards a personalized radiotherapy. Considering the importance of active caspase-3 in the proteolytic cascade that ensures radiation-induced apoptosis execution, this research was designed to evaluate the expression levels of this protein as a bioindicator of individual radiosensitivity. Peripheral blood samples of 10 healthy individuals were gamma-irradiated (cobalt-60 source) with 1, 2 and 4 Gy (control: non-irradiated samples), and active caspase-3 expression levels were measured in lymphocytes, by flow cytometry, ex vivo and after different times of in vitro incubation (24, 48 and 72 hours). Short-term incubation of 24 h was the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Active caspase-3; Apoptosis; Flow cytometry; Ionizing radiation; Lymphocytes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200649

Genotoxicity, anti-melanoma and antioxidant activities of Hymenaea courbaril L. seed extract
Provedor de dados: 42
Autores: SPERA,KAMILLE D.; FIGUEIREDO,PATRÍCIA A.; SANTOS,PAMELA C.E; BARBOSA,FERNANDO C.; ALVES,CAIO P.; DOKKEDAL,ANNE LÍGIA; SALDANHA,LUIZ LEONARDO; SILVA,LUCIANA P.; FIGUEIREDO,CARLOS ROGÉRIO; FERREIRA,PAULO CESAR; SILVA,REGILDO M.G. DA.
Abstract: Hymenaea courbaril has been used to treat different diseases, although its properties are yet to be scientifically validated. The objective of this study was to determine the cytotoxicity, genotoxicity, antigenotoxicity and antioxidant potentials of hydroethanolic extract from H. courbaril seeds. Therefore, for the cytotoxicity test an anti-melanoma assay was performed in B16F10 strain cells. The genotoxicity and antigenotoxicity was evaluated in bone marrow cells (Permit number: 002/2010) of mice, the antioxidant activity was determined by the DPPH test and the total flavonoid content was also determined. The hydroethanolic extract showed antigenotoxic effect and antioxidant activity. It was verified that total flavonoid content was 442.25±18.03...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: B16F10 melanoma cells; Micronucleus test; Chromosomal aberration; DPPH radical scavenging; HPLC-DAD.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700617

Integral transform analysis of radionuclide transport in variably saturated media using a physical non-equilibrium model: application to solid waste leaching at a uranium mining installation
Provedor de dados: 42
Autores: Cotta,Renato M.; Naveira-Cotta,Carolina P.; Genuchten,Martinus T.; Su,Jian; Quaresma,João N.N.
Abstract: The Generalized Integral Transform Technique (GITT) was employed to simulate transient one-dimensional flow in variably saturated porous media, as well as radioactive waste transport within different layers (a solid waste pile, nearby soil, and a granular aquifer) towards the edge of a uranium mining installation under institutional control. Computational codes, written using the Mathematica software system, were implemented and tested for solution of the coupled advection-dispersion equations for an arbitrary number of daughter products within a radioactive chain migrating in saturated and unsaturated soil layers. The computer simulations were verified in great detail against results obtained using the built-in routine NDSolve of the Mathematica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Uranium mining; Radioactive waste leaching; Unsaturated porous media; Physical non-equilibrium transport; Hybrid methods; Generalized Integral Transform Technique (GITT).
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101102

Chemistry and Health: Past, Present and Future
Provedor de dados: 42
Autores: CAVALEIRO,JOSÉ A.S.
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000300991

Tests on the geopotential model EGM96 in São Paulo State Region
Provedor de dados: 42
Autores: Souza,Sérgio F.; Sá,Nelsi C. de.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200017

Benthic foraminifera distribution in high polluted sediments from Niterói Harbor (Guanabara Bay), Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Vilela,Claudia G.; Batista,Daniele S.; Batista-Neto,José A.; Crapez,Mirian; Mcallister,John J.
Dockyards and harbors are recognized as being important locations where sediment-associated pollutants can accumulate, which constitutes an environmental risk to aquatic life due to potential uptake and accumulation of heavy metals in the biota. The aim of this paper is to assess the concentrations and the effects of some heavy metals in the benthic foraminifera assemblage in Niterói Harbor. Low concentrations in the benthic foraminifera as well as the dominance of indicative species such as Ammonia tepida, Buliminella elegantissima and Bolivina lowmani can be associated with an environment under stress. In addition, the occurrence of test abnormalities among foraminifera may represent a useful biomarker for evaluating long-term environmental impacts in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic foraminifera; Guanabara Bay; Pollution; Heavy-metals.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100014

Patterns of arboreal and terrestrial space use by non-volant small mammals in an Araucaria forest of southern Brazil
Provedor de dados: 42
Autores: ABREU,MAURY S.L.; OLIVEIRA,LARISSA R. DE.
Despite the advances in the techniques for researching arboreal small mammals, detailed ecological data, such as habitat use patterns, are practically nonexistent for many species. Using 150 live-traps installed on the ground, understory (1.0-5.0m) and canopy (&gt;5.0m) we investigated patterns of arboreal and terrestrial space use by small mammals in an Araucaria Forest in southern Brazil (29°29′08″S; 50°12′26″W). We also measured 19 microhabitat variables that could potentially influence the abundance of such mammals on each trap station. The results indicated that Akodon montensis and A. serrensis were mainly terrestrial. Delomys dorsalis was also terrestrial, but it also used understory (17.24% of captures). Juliomys sp. and Gracilinanus microtarsus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Didelphimorphia; Micro-habitat; Mamíferos neotropicais; Rodentia; Estratificação vertical.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200807

Arthritic lesions and congenital fusion in foot bones of Panochthus sp. (Xenarthra, Cingulata)
Provedor de dados: 42
Autores: BARBOSA,FERNANDO HENRIQUE DE S.; PORPINO,KLEBERSON DE O.; ROTHSCHILD,BRUCE M.; CABRAL,UIARA G.; BERGQVIST,LILIAN P.
ABSTRACT A set of lesions are re-described and new pathological findings in foot bones of Panochthus sp. (Xenarthra, Cingulata) are presented. The material reexamined in fact presents enthesiophytes instead of osteoartrithis, as previously interpreted. Furthermore, Calcium Pyrophosphate Deposition Disease (CPPD) was observed, a lesion absent in previous report. CPPD also was found in another set of foot bones and it was associated with a congenital fusion of two sesamoids. The material studied were collected in two natural tank deposits, one in Paraíba (material reexamined) and other in Rio Grande do Norte (new pathological findings) State.
Tipo: Info:eu-repo/semantics/article
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200501

Ontogenetic shape changes and sexual dimorphism in Aegla marginata Bond-Buckup and Buckup, 1994
Provedor de dados: 42
Autores: ADAM,CAROLINA L.; MAROCHI,MURILO Z.; MASUNARI,SETUKO.
ABSTRACT A study on relative growth, sexual dimorphism and ontogenetic trajectory was carried out in a population of the aeglidAegla marginata coming from Barrinha River, Iguape River Basin, Tunas do Paraná, Paraná State, Brazil. The size the of morphological sexual maturity was estimated for males and females. The analysis of sexual dimorphism and ontogenetic trajectory were performed using geometric morphometric technique. Males reach maturity with 10.58 mm of carapace length (CL) and females with 10.38 mm CL. Sexual size dimorphism was only visible among adults, with males reaching larger sizes. This is probably related to the reproductive strategy of males. However, sexual shape dimorphism was found for both juveniles and adults: the posterior region...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Relative growth; Sexual dimorphism; Shape.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401521

Redescription of Tijubina pontei, an Early Cretaceous lizard (Reptilia; Squamata) from the Crato Formation of Brazil
Provedor de dados: 42
Autores: Simões,Tiago R.
The record of Gondwanan Mesozoic lizards is very poor. Among the few species described for this region there is Tijubina pontei, an Early Cretaceous lizard from the Crato Formation (late Aptian) of northeast Brazil. Its description is very brief and lacks most of its diagnostic characters and clear delimitation from other lizard species. Here, a full redescription of the holotype is provided. T. pontei is demonstrated to be a valid species and a new diagnosis is provided with reference to Olindalacerta brasiliensis, a contemporary species of the Crato Formation. It lacks the posteroventral and posterodorsal processes of the dentary; the tibial/fibular length equals the femoral length and its posterior dentary teeth are robust, cylindrically based,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Crato Formation; Fossil lizard; Lower Cretaceous; Tijubina pontei; Tijubina pontei.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100008

Silvopastoral system with Eucalyptus as a strategy for mitigating the effects of climate change on Brazilian pasturelands
Provedor de dados: 42
Autores: BOSI,CRISTIAM; PEZZOPANE,JOSÉ RICARDO M.; SENTELHAS,PAULO CESAR.
Abstract  The aim of the present study was to assess the effect of Eucalyptus trees in a silvopastoral system on the microclimate and the capacity of that to mitigate the effects of climate change on pasturelands. This study included an open pasture of Piatã palisadegrass and an adjacent pasture that contained both palisadegrass and East-to-West rows of Eucalyptus trees, with 15 m between rows, 2 m between trees within rows. The micrometeorological measurements were collected at several distances from the tree rows and in the open pasture. The silvopastoral system was associated with greater between-row shading when solar declination was high and greater near-tree shading when solar declination was around -22°. Both soil heat flux and temperature were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroforestry; Microclimate; Net radiation; Shading; Soil heat flux; Windbreak.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201001

High susceptibility of activated lymphocytes to oxidative stress-induced cell death
Provedor de dados: 42
Autores: Degasperi,Giovanna R.; Castilho,Roger F.; Vercesi,Anibal E.
The present study provides evidence that activated spleen lymphocytes from Walker 256 tumor bearing rats are more susceptible than controls to tert-butyl hydroperoxide (t-BOOH)-induced necrotic cell death in vitro. The iron chelator and antioxidant deferoxamine, the intracellular Ca2+ chelator BAPTA, the L-type Ca2+ channel antagonist nifedipine or the mitochondrial permeability transition inhibitor cyclosporin A, but not the calcineurin inhibitor FK-506, render control and activated lymphocytes equally resistant to the toxic effects of t-BOOH. Incubation of activated lymphocytes in the presence of t-BOOH resulted in a cyclosporin A-sensitive decrease in mitochondrial membrane potential. These results indicate that the higher cytosolic Ca2+ level in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell death; Free radicals; Immune response; Lymphopenia; Mitochondrial permeability transition; Spleen lymphocyte.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100009

Development of an annual drought classification system based on drought severity indexes
Provedor de dados: 42
Autores: LIMA,RAFAEL P.C.; SILVA,DEMETRIUS D. DA; MOREIRA,MICHEL C.; PASSOS,JÉSSICA B.M.C.; COELHO,CLÍVIA D.; ELESBON,ABRAHÃO A.A.
Abstract: In order to characterize the occurrence and intensity of droughts in the Doce River Basin, as well as to develop a system for its classification, four different drought indexes were evaluated: Percent of Normal Precipitation (PNP), Deciles Method (DM), Rainfall Anomaly Index (RAI) and Standardized Precipitation Index (SPI). The indices were calculated annually, based on precipitation data from 89 rainfall stations of the Brazilian National Water Agency (ANA). Nine analysis units (AUs) were determined in the basin and the Thiessen Polygons method was used to obtain the average precipitation in the respective drainage areas. The indices were calculated for each AU and then related to the drought intensity classes. An overall classification of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatic condition; Doce river; Precipitation; Rainfall season; River basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100852

Analysis of an alternative method for the study of bromeliad-associated fauna in plants with different foliar organization
Provedor de dados: 42
Autores: Müller,Gerson A.; Name,Fernando T.; Pacheco,Frederico C.L.; Marcondes,Carlos B.
The efficiency of an alternative method of collection (by suction of water) for the study of Culicidae and Chironomidae (Diptera), Scirtidae (Coleoptera) and Coenagrionidae (Odonata) in bromeliads with different foliar architecture in a restinga at Florianópolis, SC, Brazil, was studied. The alternative method was less efficient to collect Culicidae and Chironomidae (Wilcoxon test p &lt; 0.05) and was more efficient to Scirtidae and Coenagrionidae (Wilcoxon test p &amp;gt; 0.05) from Aechmea lindenii. This method was less efficient to collect insects of all groups from Vriesea friburgensis (Wilcoxon test p &lt; 0.05). The alternative method was efficient to estimate the diversity of these insects in both species of bromeliads. The higher mobility of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chironomidae; Collecting method; Culicidae; Odonata; Phytotelmata; Scirtidae.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400012

Advances in bioacoustics
Provedor de dados: 42
Autores: Vielliard,Jacques M.E.
Tipo: Info:eu-repo/semantics/other
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200001

Graphs with constant mean curvature in the 3-hyperbolic space
Provedor de dados: 42
Autores: HINOJOSA,PEDRO A.
In this work we will deal with disc type surfaces of constant mean curvature in the three dimensional hyperbolic space which are given as graphs of smooth functions over planar domains. From the various types of graphs that could be defined in the hyperbolic space we consider in particular the horizontal and the geodesic graphs. We proved that if the mean curvature is constant, then such graphs are equivalent in the following sense: suppose that M is a constant mean curvature surface in the 3-hyperbolic space such that M is a geodesic graph of a function rho that is zero at the boundary, then there exist a smooth function f that also vanishes at the boundary, such that M is a horizontal graph of f. Moreover, the reciprocal is also true.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyperbolic space; Geodesic and horizontal graphs; Constant mean curvature; Elliptic partial differential equations.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300001

Technical efficiency analysis of marine shrimp farming (Litopenaeus vannamei) in biofloc and conventional systems: A case study in northeastern Brazil
Provedor de dados: 42
Autores: REGO,MARCELO A.S.; SABBAG,OMAR J.; SOARES,ROBERTA B.; PEIXOTO,SILVIO.
Abstract Shrimp farming has a great ecological, economic, and social importance in northeastern Brazil. Although the conventional farming system is widely used, biofloc technology (BFT) system has been developed to reduce environmental impacts and optimizing the production. Thus,the present study evaluated the technical efficiency of production cycles of Litopenaeus vannamei in conventional and BFT systems.We analyzed 48 production cycles in the conventional system in 2013 and 2014 and 9 cycles in the BFT system in 2014 through data envelopment analysis (DEA). The inputs corresponded to the population density (post-larvae m-2), amount of feed (kg ha-1 cycle-1), labor (man ha-1) and power supply (HP ha-1), whereas the yield (kg ha-1 cycle-1) was considered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data envelopment analysis; Inefficiency; Productive systems; Shrimp farming.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703705

Clinical studies: generic medicines
Provedor de dados: 42
Autores: ALVES,ANTONIO J.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300040

Bird diversity along a gradient of fragmented habitats of the Cerrado
Provedor de dados: 42
Autores: JESUS,SHAYANA DE; PEDRO,WAGNER A.; BISPO,ARTHUR A.
ABSTRACT Understanding the factors that affect biodiversity is of central interest to ecology, and essential to species conservation and ecosystems management. We sampled bird communities in 17 forest fragments in the Cerrado biome, the Central-West region of Brazil. We aimed to know the communities structure pattern and the influence of geographical distance and environmental variables on them, along a gradient of fragmented habitats at both local and landscape scales. Eight structural variables of the fragments served as an environmental distance measurement at the local scale while five metrics served as an environmental distance measurement at the landscape scale. Species presence-absence data were used to calculate the dissimilarity index. Beta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta diversity; Environmental distance; Forest fragments; Landscape scale; Turnover.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100123

Multicomponent training with different frequencies on body composition and physical fitness in obese children
Provedor de dados: 42
Autores: ALVES,ANA SOFIA R.; VENÂNCIO,TELMA L.; HONÓRIO,SAMUEL ALEXANDRE A.; MARTINS,JÚLIO MANUEL C.
Abstract:  Introduction: The aim of the study was to compare the effects of ten-week multicomponent training with different exercise frequencies on body composition (BC) and physical fitness (PF) in overweight and obese young children. Methods: 40 children, aged 12-15 (14.77±1.49), were randomly selected and assigned to experimental groups to train three times/week (EG1) or two times/week (EG2) for 10 weeks and a CG group (no training program). Results: It was shown that experimental groups (EG1 and EG2) improved similarly aerobic capacity (3.8% and 3.5%, respectively), muscular strength (29.7% and 25.2%), flexibility (6.1% and 9.9%), body mass index (5.0% and 4.6%), and body fat (6.4% and 5.6%) from pre- to post-training. CG group showed no significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerobic; Health; Obesity; Strength; Youth; Program.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700802

Geochronology of ore deposits: new trends about age and lifetime of the hydrothermal systems
Provedor de dados: 42
Autores: TASSINARI,COLOMBO C.G.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300036

Lizard assemblages on sandy coastal plains in southeastern Brazil: An analysis of occurrence and composition, and the role of habitat structure
Provedor de dados: 42
Autores: OLIVEIRA,JANE C.F.; PEREIRA-RIBEIRO,JULIANE; WINCK,GISELE R.; ROCHA,CARLOS F.D.
Abstract Data on the structure of lizard communities in the different biomes and ecosystems of Brazil are still limited. In this study, we related the species richness, abundance and the spatial occurrence of lizards to the structure of the vegetation found on the coast of the state of Espírito Santo, southeastern Brazil, to determine whether habitat influences the structure of lizard communities. We conducted fieldwork in 2012, 2013 and 2014, collecting data in standardized samples. We analyze whether variables of vegetation structure influenced species richness and abundance, using Generalized Linear Models (GLMs). We recorded 12 lizard species from eight families. In general, species richness and abundance were similar among sites. Locally, we recorded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community ecology; Community structure; Mesohabitat; Squamata.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100602

Contributions of the complexity paradigm to the understanding of Cerrado's organization and dynamics
Provedor de dados: 42
Autores: MATTOS,SÉRGIO H.V.L. DE; VICENTE,LUIZ E.; PEREZ FILHO,ARCHIMEDES; PIQUEIRA,JOSÉ R.C.
ABSTRACT The Brazilian Cerrado is a vegetation mosaic composed of different physiognomies. Discussions remain open regarding the factors and processes responsible for the dynamic and spatial organization of the Cerrado - in its different physiognomies. The contributions of the complexity paradigm in this context are still less exploited, despite its great potential for explanations and predictions presented in previous diverse dynamic systems of complex behavior researches, a category in which the Cerrado can be included. This article has the intention of contributing to the construction of this new perspective, discussing - from theoretical concepts - the paradigm of complexity for the understanding of the organization and the dynamics of the Cerrado.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Complexity; Complex system; Dynamics; Self-organized criticality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602417

Some devonian Chonetoidea (Brachiopoda) from the Amazon and Parnaíba Basins, Brazil, and their stratigraphic and paleogeographic implications
Provedor de dados: 42
Autores: FONSECA,VERA M.M.; MACHADO,DEUSANA M.C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200012

Frequency and foraging behavior of Apis mellifera in two melon hybrids in Juazeiro, state of Bahia, Brazil
Provedor de dados: 42
Autores: KIILL,LÚCIA H.P.; SIQUEIRA,KÁTIA M.M.; MÁRCIA S.,COELHO; SILVA,TAMIRES A.; GAMA,DIEGO R.S.; ARAÚJO,DIEGO C.S.; PEREIRA NETO,JOAQUIM.
The study was carried out to verify if there are differences in foraging frequency and behavior of Apis mellifera in two melon hybrids (10:00 – ‘Yellow melon’ and Sancho -‘Piel de Sapo’) in the municipality of Juazeiro, state of Bahia, Brazil. The frequency, behavior of visitors and the floral resource foraged were registered from 5:00 am to 6:00 pm. There was a significant difference in the frequency of visits when comparing hydrids (F = 103.74, p &lt;0.0001), floral type (F = 47.25, p &lt;0.0001) and resource foraged (F = 239.14, p &lt;0.0001). The flowers of Sancho were more attractive to A. mellifera when compared with hybrid 10:00, which may be correlated to the morphology and floral resources available. This could be solved with scaled planting,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo L; Melon hybrids; Nectar; Pollen.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402049

Vegetation replacement in Rio de Janeiro during the last 7,000 years B.C., genetic variation in the medicinal plant Lippia alba (Verbenaceae), and short review of Chagas disease in prehistory
Provedor de dados: 42
Autores: Kellner,Alexander Wa.
Tipo: Info:eu-repo/semantics/other
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300001

Spray-dried porcine plasma added to diets contaminated with aflatoxins and fumonisins shows beneficial effects to piglet health
Provedor de dados: 42
Autores: MÜLLER,LUCIELI K.F.; PAIANO,DIOVANI; BOTTARI,NATHIELI B.; SANTURIO,JANIO M.; ZAMPAR,ALINE; SCHETINGER,MARIA R.C.; ZANETTE,RÉGIS A.; MENDES,RICARDO E.; GLORIA,EDUARDO M.; BALDISSERA,MATHEUS D.; SILVA,ALEKSANDRO S. DA.
Abstract This study was aimed to analyze the effects of spray-dried porcine plasma (SDPP) on the health of post weaning piglets challenged with diets contaminated with aflatoxins and fumonisins. Fifty-six male piglets (7.15 ± 0.61 kg) were allocated in four groups: CTL group received a regular diet; SDPP group received a regular diet and 6% SDPP; MYC group received a diet containing 300 µg/kg aflatoxins and 8,000 µg/kg fumonisins; group MYC+SDPP received 300 µg/kg aflatoxins, 8,000 µg/kg fumonisins and 6% SDPP. The animals that received the experimental diet containing mycotoxins (MYC group) had lower weight gain at the end of the experiment compared to the other treatments. Animals receiving SDPP showed decreased urea levels throughout the experiment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional foods; Intoxication; Mycotoxins; Pigs; Health.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603115

Patterns of Antimicrobial therapy in acute tonsillitis: A cross-sectional Hospital-based study from UAE
Provedor de dados: 42
Autores: JOHN,LISHA J.; CHERIAN,MEENU; SREEDHARAN,JAYADEVAN; CHERIAN,TAMBI.
Background: Diseases of the ear, nose and throat (ENT) are associated with significant impairment of the daily life and a major cause for absenteeism from work.Aim: The study determined antimicrobial prescription pattern in patients with acute tonsillitis.Materials and Methods: A cross-sectional study was carried out among all the patients attending the ENT department with acute tonsillitis. Data were retrieved from the medical records using a proforma. Statistical analysis was carried out using SPSS.19.Results: Total of 238 patients included (Males 138; females 100). About 96% of total drugs were prescribed by generic name. Median number of drugs prescribed was four (range 1-7). Eighty eight percent of prescriptions contained antimicrobials, (78.5%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drug utilization; Antimicrobial use; Acute tonsillitis; Parenteral.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100451

A new approach to feed frequency studies and protein intake regulation in juvenile pirarucu
Provedor de dados: 42
Autores: MATTOS,BRUNO O. DE; NASCIMENTO FILHO,EDUARDO C.T.; SANTOS,ALINE A.; BARRETO,KAYCK A.; SÁNCHEZ-VÁZQUEZ,FRANCISCO J.; FORTES-SILVA,RODRIGO.
ABSTRACT This study aimed to investigate pirarucu's (Arapaima gigas) ability to trigger a self-feeding system to regulate protein intake between two standard diets that contained 39% and 49% of crude protein. The same system allowed the evaluation of daily feeding and locomotor activity rhythms. Eighteen fish (654.44±26.85g) were distributed into six 250 L tanks (3 fish/tank). Fish had free access to both diets (39% vs. 49% protein) by feeders (2 per tank), adapted to be activated by fish themselves. This system was connected to a computer system. After an adaptation period, fish learned to activate feeders and the mean food intake recorded was 2.14% of their body weight on a daily basis. Fish showed feeding (72.48%) and locomotor (72.49%) activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arapaima gigas; Feeding behavior; Protein intake; Self-feeding.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301243

Inhibitory Effect on the Hepatitis B Cells through the Regulation of miR-122-MAP3K2 signal pathway
Provedor de dados: 42
Autores: CHEN,SONGLIN; YANG,LEI; PAN,AIPING; DUAN,SILIANG; LI,MINGFEN; LI,PING; HUANG,JINGJING; GAO,XINGXIN; HUANG,XIAOQI; LIN,YINGHUI.
Abstract: The aim of this study was to investigate the inhibitory effect of regulation of miR-122-MAP3K2 signal pathway on the hepatitis B cells. We detected the content of MAP3K2 from patients with HBV blood serum samples and analyzed the correlation between content of MAP3K2 and copies of HBV-DNA. Wound healing and Transwell assays were used to detect the function of cells from control group (wild type) and observer group (overexpresses miR-122). Secretion levels of HBsAg and MAP3K2 in the supernatant and level of MAP3K2 in cells were detected by ELISA and western blot, respectively. The results showed that there was a positive correlation between the copies of HBV-DNA and MAP3K2 in serum. In the assays involving detection of the number of HBV-DNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatitis B cells; MiR-122; Inhibit; Signaling pathway.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300703

Identification of Tibicen cicada species by a Principal Components Analysis of their songs
Provedor de dados: 42
Autores: Ohya,Eiji.
Specific identification of three Tibicen cicadas, T. japonicus, T. flammatus and T. bihamatus, by their chirping sounds was carried out using Principal Components Analysis (PCA). High quality recordings of each species were used as the standards. The peak and mean frequencies and the pulse rate were used as the variables. Out of 12 samples recorded in the fields one fell in the vicinity of T. japonicus and all other were positioned near T. bihamatus. Then the cluster analysis of the PCA scores clearly separated each species and allocated the samples in the same way.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cicada; Tibicen; Principal Components Analysis; Sound; Identification.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200038

Oceanographic parameters in continental margin of the State of Ceará (northeastern Brazil) deduced from C and O isotopes in foraminifers
Provedor de dados: 42
Autores: Marques,Wanessa S.; Menor,Eldemar de A.; Sial,Alcides N.; Manso,Valdir A.V.; Freire,Satander S.
Specimens of Recent foraminifera of Amphistegina radiata, Peneroplis planatus and Globigerinoides ruber, from fifty samples of surface sediments of the continental margin of the State of Ceará, Brazil, have been analyzed for carbon and oxygen isotopes to investigate oceanographic parameters and determine the values of delta18O of the oceanic water. From a comparison between values of delta18O obtained for ocean water using the linear equations by (Craig and Gordon 1965) and the one by Wolff et al. (1998), it became evident that the former yielded a more reliable value (0.2‰ SMOW) than the latter. Lower values of delta18O for the ocean water in this continental margin resulted from continental water influence. Values of 18O (-0.3‰ to -1.5‰ PDB for benthic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraminifers; Carbon and oxygen isotopes; Continental margin; Ceará; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100015

Modeling and mapping basal area of Pinus taeda L. plantation using airborne LiDAR data
Provedor de dados: 42
Autores: SILVA,CARLOS A.; KLAUBERG,CARINE; HUDAK,ANDREW T.; VIERLING,LEE A.; FENNEMA,SCOTT J.; CORTE,ANA PAULA D.
ABSTRACT Basal area (BA) is a good predictor of timber stand volume and forest growth. This study developed predictive models using field and airborne LiDAR (Light Detection and Ranging) data for estimation of basal area in Pinus taeda plantation in south Brazil. In the field, BA was collected from conventional forest inventory plots. Multiple linear regression models for predicting BA from LiDAR-derived metrics were developed and evaluated for predictive power and parsimony. The best model to predict BA from a family of six models was selected based on corrected Akaike Information Criterion (AICc) and assessed by the adjusted coefficient of determination (adj. R²) and root mean square error (RMSE). The best model revealed an adj. R²=0.93 and RMSE=7.74%....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest Inventory; LiDAR metrics; Multiple Linear Regression; Remote Sensing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401895

Ecology and variability of chemical mediators from Plumbago species
Provedor de dados: 42
Autores: Paiva,Selma R. de; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200023

Efficiency of essential oils of Ocimum basilicum and Cymbopogum flexuosus in the sedation and anaesthesia of Nile tilapia juveniles
Provedor de dados: 42
Autores: NETTO,JOSÉ D. LIMMA; OLIVEIRA,REBECA S.M.; COPATTI,CARLOS EDUARDO.
ABSTRACT This study aimed to verify the sedative and anaesthetic effect of the essential oils of basil (Ocimum basilicum) (EOOB) and lemongrass (Cymbopogum flexuosus) (EOCF) in Nile tilapia juveniles. The fish were transferred to aquaria containing different concentrations of each essential oil: 10, 25, 50, 100, 200, 400 and 600 μL L-1. The time of sedation ranged from 7 to 31 seconds and the recommended concentration was 10 or 25 μL L-1 for both essential oils. The best times for anaesthesia and recovery were found for the concentrations of 400 μL L-1 for EOOB (135.2 and 199.1 seconds, respectively) and 600 μL L-1 for EOCF (327.1 and 374.8 seconds, respectively). In conclusion, we recommend the use of EOOB and EOCF for the sedation and anaesthesia of Nile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedation; Recovery; Basil; Lemongrass.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602971

Clutch size in populations and species of cnemidophorines (Squamata: Teiidae) on the eastern coast of Brazil
Provedor de dados: 42
Autores: MENEZES,VANDERLAINE A.; ROCHA,CARLOS F.D.
We analyzed some reproductive aspects of 16 coastal populations, belonging to five lizard species (A. ocellifera, A. abaetensis, A. nativo, A. littoralis and C. lacertoides) from different restinga habitats along the eastern coast of Brazil. This study aimed to evaluate to what extent the reproductive aspects vary geographically and among species. For each female, we recorded the number of vitellogenic follicles, size and color of the largest follicle, presence and size of corpora lutea, and number and size of oviductal eggs. Clutch size of almost all coastal populations/species of Ameivula had little variation and most clutches were composed of two eggs. There was a significant relationship between female size and the mean clutch size when females from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clutch size; Ameivula; Reproduction; Restinga.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200707

Interconnection between microstructure and microhardness of directionally solidified binary Al-6wt.%Cu and multicomponent Al-6wt.%Cu-8wt.%Si alloys
Provedor de dados: 42
Autores: VASCONCELOS,ANGELA J.; KIKUCHI,RAFAEL H.; BARROS,ANDRÉ S.; COSTA,THIAGO A.; DIAS,MARCELINO; MOREIRA,ANTONIO L.; SILVA,ADRINA P.; ROCHA,OTÁVIO L.
An experimental study has been carried out to evaluate the microstructural and microhardness evolution on the directionally solidified binary Al-Cu and multicomponent Al-Cu-Si alloys and the influence of Si alloying. For this purpose specimens of Al-6wt.%Cu and Al-6wt.%Cu-8wt.%Si alloys were prepared and directionally solidified under transient conditions of heat extraction. A water-cooled horizontal directional solidification device was applied. A comprehensive characterization is performed including experimental dendrite tip growth rates (VL) and cooling rates (TR) by measuring Vickers microhardness (HV), optical microscopy and scanning electron microscopy with microanalysis performed by energy dispersive spectrometry (SEM-EDS). The results show, for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solidification; Metals and alloys; Electron microscopy; Hardness.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301099

CYP2B6 516 G&amp;gt;T polymorphism and side effects of the central nervous system in HIV-positive individuals under Efavirenz treatment: Study of a sample from southern Brazil
Provedor de dados: 42
Autores: MÜLLER,TALISE E.; ELLWANGER,JOEL H.; MICHITA,RAFAEL T.; MATTE,MARIA CRISTINA C.; RENNER,JANE D.P.
ABSTRACT This study aimed to identify the 516 G&gt;T polymorphism of the CYP2B6 gene and evaluate its influence on central nervous system (CNS) side effect development in HIV-positive individuals undergoing Efavirenz (EFV) treatment in a population from southern Brazil. Additionally, we performed a survey on the clinical and epidemiological characteristics of our sample. In addition to medical records evaluation, whole blood of 89 individuals was analyzed for viral load, T lymphocyte count (CD4+ and CD8+), and the polymorphism. Considering the side effects of the CNS reported by individuals but without considering the genetic variables, no statistically significant association was noted between the adverse effects and the antiretroviral treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV; Efavirenz; Antiretroviral therapy; CYP2B6.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200497

Ongoing quiescence in the Borborema Plateau Plague focus (Paraiba, Brazil)
Provedor de dados: 42
Autores: ZEPPELINI,CAIO G.; DE ALMEIDA,ALZIRA M.P.; CORDEIRO-ESTRELA,PEDRO.
Abstract Plague is a zoonosis caused by Yersinia pestis, whose cycle is based on a reservoir system composed of mammals and their fleas. Its transmission cycle presents long enzootic periods with undetected cases, sometimes misleading that the cycle is extinct. While surveillance activities in Brazil are being carried out only in some focal areas, the serologic results confirm the persistence of Y. pestis in all monitored areas. We studied the small mammal assembly and Y. pestis presencein the Borborema Plateau Focus within the state of Paraíba, which staged the last Brazilian plague outbreak (1986-1987), through aninventory and Y. pestis detection survey of small mammals in peridomestic and sylvatic areas from two municipalities in the state of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Small mammals; Peridomestic environment; Yersinia pestis; Quiescence; Surveillance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603007

Molecular farming of antimicrobial peptides: available platforms and strategies for improving protein biosynthesis using modified virus vectors
Provedor de dados: 42
Autores: LEITE,MICHEL L.; SAMPAIO,KAMILA B.; COSTA,FABRÍCIO F.; FRANCO,OCTÁVIO L.; DIAS,SIMONI C.; CUNHA,NICOLAU B.
Abstract The constant demand for new antibiotic drugs has driven efforts by the scientific community to prospect for peptides with a broad spectrum of action. In this context, antimicrobial peptides (AMPs) have acquired great scientific importance in recent years due to their ability to possess antimicrobial and immunomodulatory activity. In the last two decades, plants have attracted the interest of the scientific community and industry as regards their potential as biofactories of heterologous proteins. One of the most promising approaches is the use of viral vectors to maximize the transient expression of drugs in the leaves of the plant Nicotiana benthamiana. Recently, the MagnifectionTM expression system was launched. This sophisticated commercial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial peptides; Magnifection; Nicotiana benthamiana; Transient expression.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200851

Structural and geochronological constraints on the evolution of the Juréia Massif, Registro Domain, State of São Paulo, Brazil
Provedor de dados: 42
Autores: Passarelli,Cláudia R.; Basei,Miguel A.S.; Prazeres-Filho,Hélcio J.; Siga-Jr.,Oswaldo; Szabó,Gergely A.J.; Marco-Neto,Joaquim.
The Juréia Massif, southeastern São Paulo State (Brazil), is part of the Registro Domain, limited to the north by the Cubatão-Itariri Shear System and to the south by the Serrinha Shear Zone. Mostly composed of migmatitic granitegneiss rocks, represents a Paleoproterozoic terrane (1.9-2.2 Ga) strongly deformed during the Neoproterozoic (750-580 Ma). The present tectonic scenario was established at the end of the Neoproterozoic, as a result of collages associated with the formation of Western Gondwana. The Ponta da Juréia, our study area within the Juréia Massif, is constituted by paragneisses (garnet-muscovite-biotite gneisses). The monazite U-Pb age of 750 Ma is related to a main regional metamorphic event that reached the high amphibolite facies,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tectonic domain; Shear zone; Gneissic rocks; U-Pb geochronology.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300008

Effect of thermo-coupled processes on the behaviour of a clay barrier submitted to heating and hydration
Provedor de dados: 42
Autores: Sánchez,Marcelo; Gens,Antonio; Olivella,Sebastia.
The storage of high level radioactive waste is still an unresolved problem of the nuclear industry, being geological disposal the most favoured option and, naturally, the one requiring the strongest geo-mechanical input. Most conceptual designs for the deep geological disposal of nuclear waste envisage placing the canisters containing the waste in horizontal drifts or vertical boreholes. The empty space surrounding the canisters is filled by an engineered barrier often made up of compacted swelling clay. Inthebarrierandthenearfield,significantthermo-hydro-mechanical(THM) phenomena take place that interact in a complex way. A good understanding of THM issues is, therefore, necessary to ensure a correct performance of engineered barriers and seals. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Expansive clays; Heating test; Nuclear waste disposal; Thermo-hydro-mechanical coupled analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100013

Marcinkiewicz strong laws for linear statistics of rho*-mixing sequences of random variables
Provedor de dados: 42
Autores: Cai,Guang-Hui.
Strong laws are established for linear statistics that are weighted sums of a random sample. We show extensions of the Marcinkiewicz-Zygmund strong laws under certain moment conditions on both the weights and the distribution. These not only generalize the result of Bai and Cheng (2000, Statist Probab Lett 46: 105-112) to rho*-mixing sequences of random variables, but also improve them.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rho*-mixing; Marcinkiewicz-Zygmund strong laws; Weighted sums.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400001

C-isotope composition of early Paleoproterozoic carbonates from the Minas Supergroup and the record of The Lomagundi phenomenon in Brazil
Provedor de dados: 42
Autores: SIAL,ALCIDES N.; FERREIRA,VALDEREZ P.; ROMANO,ANTONIO W.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300048

A duality result between the minimal surface equation and the maximal surface equation
Provedor de dados: 42
Autores: ALÍAS,LUIS J.; PALMER,BENNETT.
In this note we show how classical Bernstein's theorem on minimal surfaces in the Euclidean space can be seen as a consequence of Calabi-Bernstein's theorem on maximal surfaces in the Lorentz-Minkowski space (and viceversa). This follows from a simple but nice duality between solutions to their corresponding differential equations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minimal surface equation; Maximal surface equation; Bernstein's theorem; Calabi-Bernstein's theorem.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200002

U-Pb dating by zircon dissolution method using chemical abrasion
Provedor de dados: 42
Autores: Takehara,Lucy; Chemale Júnior,Farid; Hartmann,Léo A.; Dussin,Ivo A.; Kawashita,Koji.
Chemical abrasion was carried out on zircons grains of the Temora II standard for U-Pb dating prior to analyses using in situ Laser Ablation-MultiCollector Ion Coupled Plasma Mass Spectrometer (LA-ICPMS) followed by the Isotope Dissolution Thermal Ionization Mass Spectrometer (ID-TIMS) method. The proposed methodology was herein applied in order to reduce primarily the effects of secondary Pb loss, the presence of common lead and/or silicate impurities. Nine Temora II zircon grains were analyzed by the laser ablation method yielding an age of 418.3±4.3 Ma. Zircon grains of a same population were separated for chemical abrasion before dissolution and mass spectrometry analyses. Six fractions of them were separated for isotope dissolution using 235U-205Pb...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Chemical abrasion; ID-TIMS; LA-MC-ICPMS; U-Pb dating; Zircon dissolution.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200011

Administering ascorbic acid to rats undergoing ageing processes: effects on myosin-V immunoreactive myenteric neurons
Provedor de dados: 42
Autores: Mello,Sônia A.; Marese,Angélica C.M.; Brancalhão,Rose M.C.; Zanoni,Jacqueline N.; Natali,Maria Raquel M.
During the ageing process the enteric nervous system undergoes morphofunctional changes, such as enteric neurodegeneration. Neuronal death can be attributed to increase radicals free, and ascorbic acid (AA), known antioxidant, could minimize damage cause by oxidative stress. The objective of this study is to analyse the behaviour of morphoquantative myenteric neurons in the duodenum of adult Wistar rats with aged 90 (C90), 345 (E345) and 428 (E428) days, as well as animals of the same age who received ascorbic acid supplementation for 120 days (EA345 and EA428). Whole-mount preparations of muscle layer from the duodenum of the animals were immunostained by the method myosin V. 80 microscopic fields were quantified (14.8 mm2/animal) and measured 100...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aging; Antioxidant; Enteric nervous system; Immunohistochemistry.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100337

Complementary Lagrangians in infinite dimensional symplectic Hilbert spaces
Provedor de dados: 42
Autores: Piccione,Paolo; Tausk,Daniel V.
We prove that any countable family of Lagrangian subspaces of a symplectic Hilbert space admits a common complementary Lagrangian. The proof of this puzzling result, which is not totally elementary also in the finite dimensional case, is obtained as an application of the spectral theorem for unbounded self-adjoint operators.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symplectic Hilbert spaces; Lagrangian subspaces; Lagrangian Grassmannian; Unbounded self-adjoint operators; Spectral theorem.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400002

Efficiency of eugenol as anesthetic for the early life stages of Nile tilapia (Oreochromis niloticus)
Provedor de dados: 42
Autores: Ribeiro,Paula A.P.; Miranda-Filho,Kleber C.; Melo,Daniela C. de; Luz,Ronald K.
In aquaculture, activities with anesthetic compounds are usually used in order to ensure the welfare of farmed fish, allowing handling out of water with decreased trauma by stress. Presently, there is no information about anesthetic action of eugenol in early life stages of Nile tilapia (Oreochromis niloticus). The objective of this study was to evaluate different concentrations of eugenol for larvae and juveniles of Nile tilapia. Sixty animals were used for each group of weight, group I = 0.02 g; group II = 0.08 g; group III = 0.22 g; group IV = 2.62 g; and group V = 11.64 g. The eugenol concentrations tested were 50, 75, 100, 125, 150 and 175 mg L-1. No mortality was reported during the tests with eugenol. Tilapia larvae with 0.02 g and juveniles around...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthesia; Cichlid; Handling; Welfare.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100529

Development and functional morphology of the larval foregut of two brachyuran species from Northern Brazil
Provedor de dados: 42
Autores: Abrunhosa,Fernando A.; Simith,Darlan J.B.; Monteiro,Joely R.C.; Souza Junior,Antonio N. de; Oliva,Pedro A.C.
Feeding is an important factor for the successful rearing of larvae of the crab species. Further information on the morphological features of the foregut may to reveal larval feeding behaviour and or/whether there is a lecithotrophy in some or even in all stages of the larval cycle. In the present study, the structural development of the foregut and their digestive functions were examined in larvae of two brachyurans, Uca vocator and Panopeus occidentalis, reared in the laboratory. During larval development, the foreguts of the larvae in the first and last zoeal stages and in the megalopa stage were microscopically examined, described and illustrated. The zoeal foreguts of both species were well developed, showing specialization with a functional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestive system; Megalopa; Panopeus occidentalis; Stomach; T/ca vocator; Zoea.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400014

Sawdust Derivative for Environmental Application: Chemistry, Functionalization and Removal of textile dye from aqueous solution
Provedor de dados: 42
Autores: PINTO,THAIS F.; BEZERRA,CÍCERO W.B.; SILVA,DOMINGOS S.A.; SILVA FILHO,EDSON C. DA; VIEIRA,ADRIANA P.; AIROLDI,CLAUDIO; MELO,JÚLIO C.P. DE; SILVA,HILDO A.S.; SANTANA,SIRLANE A.A.
ABSTRACT The adsorption of Violet Remazol 5R (VR 5) on wood sawdust modified with succinic anhydride (SSA) as a function of contact time, pH, and initial dye concentrations was investigated using a batch technique under ambient conditions. The SSA obtained was confirmed by IR spectroscopy, thermogravimetry and 13C NMR, and degrees of substitution (DS) were calculated. A study on the effect of the pH on the adsorption of VR 5 showed that the optimum pH was 2.0. The interactions were assayed with respect to the pseudo-first-order and pseudo-second-order kinetic models, and were found to follow closely the pseudo-second-order. The isotherm was adjusted to the Langmuir, the Freundlich and the Temkin sorption models. SSA is a promising material for the removal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wood sawdust; Adsorption; Textile dye; Succinic anhydride.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401212

Fruits of the Brazilian Atlantic Forest: allying biodiversity conservation and food security
Provedor de dados: 42
Autores: SOUZA,ROBERTA G. DE; DAN,MAURÍCIO L.; DIAS-GUIMARÃES,MARISTELA A.; GUIMARÃES,LORENA A.O.P.; BRAGA,JOÃO MARCELO A.
Abstract Supplying food to growing human populations without depleting natural resources is a challenge for modern human societies. Considering this, the present study has addressed the use of native arboreal species as sources of food for rural populations in the Brazilian Atlantic Forest. The aim was to reveal species composition of edible plants, as well as to evaluate the practices used to manage and conserve them. Ethnobotanical indices show the importance of many native trees as local sources of fruits while highlighting the preponderance of the Myrtaceae family. Conservation analysis allowed to identify Campomanesia hirsuta Gardner and Plinia edulis (Vell.) Sobral as being of high Biological Value and Conservation Priority. In spite of that, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agrodiversity; Myrtaceae; Native species; Quantitative ethnobotany; Sustainable management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703583

Tectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology
Provedor de dados: 42
Autores: RIZZOTTO,GILMAR J.; HARTMANN,LÉO A.; SANTOS,JOÃO O.S.; MCNAUGHTON,NEAL J.
New U-Pb zircon geochronological data integrated with field relationships and an airborne geophysical survey suggest that the Nova Brasilândia and Aguapeí belts are part of the same monocyclic, metaigneous and metasedimentary belt formed in the late Mesoproterozoic (1150 Ma-1110 Ma). This geological history is very similar to the within-plate origin of the Sunsás belt, in eastern Bolivia. Thus, we propose that the Nova Brasilândia, Aguapeí and Sunsás belts represent a unique geotectonic unit (here termed the Western Amazon belt) that became amalgamated at the end of the Mesoproterozoic and originated through the reactivation of a paleo-suture (Guaporé suture zone) in an intracontinental rift environment. Therefore, its geological history involves a short,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian craton; Intracontinental rift; Mesoproterozoic; Western Amazon belt; U-Pb geochronology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100057

Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review
Provedor de dados: 42
Autores: Soares,Rodrigo P. P.; Turco,Salvatore J.
Lutzomyia longipalpis is the most important vector of AmericanVisceral Leishmaniasis (AVL) due to Leishmania chagasi in the New World. Despite its importance, AVL, a disease primarily of rural areas, has increased its prevalence and became urbanized in some large cities in Brazil and other countries in Latin America. Although the disease is treatable, other control measures include elimination of infected dogs and the use of insecticides to kill the sand flies. A better understanding of vector biology could also account as one more tool for AVL control. A wide variety of papers about L. longipalpis have been published in the recent past years. This review summarizes our current information of this particular sand fly regarding its importance, biology,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sand flies; Vector biology; Lutzomyia longipalpis; Leishmania.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300005

Diet and niche breadth and overlap in fish communities within the area affected by an Amazonian reservoir (Amapá, Brazil)
Provedor de dados: 42
Autores: SÁ-OLIVEIRA,JÚLIO C.; ANGELINI,RONALDO; ISAAC-NAHUM,VICTORIA J.
We investigated the niche breadth and overlap of the fish species occurring in four environments affected by the Coaracy Nunes reservoir, in the Amapá Brazilian State. Seasonal samples of fishes were taken using a standard configuration of gillnets, as well as dragnets, lines, and cast­nets. Five hundred and forty stomach contents, representing 47 fish species were analyzed and quantified. Niche breadth and overlap were estimated using indexes of Levins and Pianka, respectively, while interspecific competition was evaluated using a null model (RA3). ANOVA and the Kruskal­Wallis test were used, respectively, to evaluate differences in niche breadth and overlap between areas. The data indicate that the majority of the fish species belong to the piscivore,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Neotropical reservoir; Diet; Species coexistence.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100383

Direct analysis of vicariance in Neotropical mayflies (Ephemeroptera)
Provedor de dados: 42
Autores: MOLINERI,CARLOS; NIETO,CAROLINA; DOMÍNGUEZ,EDUARDO.
Abstract: The distribution of aquatic insects has been poorly explored in quantitative analyses aiming at the historical reconstruction of area relationships in the Neotropics. Ephemeroptera is an ancient group, characterized by its low vagility, and of high richness and endemicity in this region. Systematic knowledge of the group has enormously increased in the last decades, achieving a sufficient background to explore biogeographical historical patterns. Our aim is to reconstruct area history in the Neotropics using the rationale of Barrier biogeography (Hovenkamp protocol). We present eleven mayfly phylogenies, representing groups that evolved independently at least from the Jurassic (i.e., not a one-taxon history). With these groups, we conducted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Historical biogeography; South America; Neotropical; Phylogeny; Taxon history.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700625

Antigenotoxicity protection of Carapa guianensis oil against mitomycin C and cyclophosphamide in mouse bone marrow
Provedor de dados: 42
Autores: LEMES,SUSY R.; CHAVES,DWIGHT A.; SILVA JÚNIOR,NELSON J. DA; CARNEIRO,CRISTIENE C.; CHEN-CHEN,LEE; ALMEIDA,LUCIANE M. DE; GONÇALVES,PABLO J.; MELO-REIS,PAULO R. DE.
ABSTRACT The aim of this study was to evaluate the possible protective of C. guianensis oil against MMC and CP, which are direct- and indirect-acting chemical mutagens, using the micronucleus test. Three experiments were performed. First the C. guianensis oil was co-administered to mice at doses of 250, 500 and 1000 mg/kg bw with 4 mg/kg bw MMC or 50 mg/kg bw CP. Second, the mutagenic drug (CP) was administered ip 50 mg/kg bw and after 6 and 12 hours 250 and 500 mg/kg bw of C. guianensis oil were administered. In the last, C. guianensis oil was administrated (250 and 500 mg/kg bw) during five days and after it was administered ip 50 mg/kg bw CP. The results obtained showed that the C. guianensis oil is not cytotoxic neither genotoxic to mouse bone marrow....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antigenotoxic; Carapa guianensis; Micronucleus; Oil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502043

Ecohydrological modeling and environmental flow regime in the Formoso River, Minas Gerais State, Brazil
Provedor de dados: 42
Autores: GUEDES,HUGO A. S.; SILVA,DEMETRIUS D.; DERGAM,JORGE A.; ELESBON,ABRAHÃO A. A.
ABSTRACT This paper aimed at determining the environmental flow regime in a 1 km stretch of the Formoso River, MG, using River2D model. To carry out the ecohydrological modeling, the following information was used: bathymetry, physical and hydraulic features, and the Habitat Suitability Index for species of the Hypostomus auroguttatus. In the River2D, the Weighted Usable Areas were determined from the average long-term streamflows with percentage from 10% to 100%. Those streamflows were simulated for the later construction of optimization matrices that maximize the habitat area throughout the year. For H. auroguttatus Juvenile, higher values of Weighted Usable Area were associated with the percentage of 60% and 70% of the average long-term streamflows in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecohydrology; Hydrodynamic modeling; River2D; Water resources; WUA.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602429

Do precipitation and food affect the reproduction of brown brocket deer Mazama gouazoubira (G. Fischer 1814) in conditions of semi-captivity?
Provedor de dados: 42
Autores: Juliá,Juan P.; Peris,Salvador J.
The births of brown brocket deer ( Mazama gouazoubira) in a secondary lower montane forest called "yunga" in northwestern Argentina were compared with rainfall. Analyses were performed with rainfall and flower-fruit fall in an attempt to determine the possible importance of these seasonal variables in birthing. The births were not directly correlated with rainfall, but rather with the flower and fruit fall of exotic plant species. This may be related to favor the development of fawns, which eat the new and more digestible plant parts, accessible one month after their births.The non-seasonal births observed around the year could be related to the selection by the deer of some plant species that have been introduced into the region ( Prunus, Morus and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Birth phenology; Fruit; Rainfall.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300010

Nutritional reserves of Vochysiaceae seeds: chemical diversity and potential economic uses
Provedor de dados: 42
Autores: Mayworm,Marco A. S; Buckeridge,Marcos S; Marquez,Ursula M. L; Salatino,Antonio.
Contents of proteins, carbohydrates and oil of seeds of 57 individuals of Vochysiaceae, involving one species of Callisthene, six of Qualea, one of Salvertia and eight of Vochysia were determined. The main nutritional reserves of Vochysiaceae seeds are proteins (20% in average) and oils (21. 6%). Mean of carbohydrate contents was 5. 8%. Callisthene showed the lowest protein content (16. 9%), while Q. cordata was the species with the highest content (30% in average). The contents of ethanol soluble carbohydrates were much higher than those of water soluble carbohydrates. Oil contents lay above 20% for most species (30. 4% in V. pygmaea and V. pyramidalis seeds). The predominant fatty acids are lauric (Q. grandiflora), oleic (Qualea and Salvertia) or acids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiesel; Carbohydrates; Fatty acids; Proteins; Seed oils; Vochysiaceae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200012

Validation of a liquid chromatography ultraviolet method for determination of herbicide diuron and its metabolites in soil samples
Provedor de dados: 42
Autores: FELICIO,ANA LUCIA S.M.; MONTEIRO,ALESSANDRA M.; ALMEIDA,MARIANA B.; MADEIRA,TIAGO B.; NIXDORF,SUZANA L.; YABE,MARIA JOSEFA S.
ABSTRACT Diuron is one of the most widely herbicide used worldwide, which can undergo degradation producing three primary metabolites: 3,4-dichlorophenylurea, 3-(3,4-dichlorophenyl)-1-methylurea, and 3,4-dichloroaniline. Since the persistence of diuron and its by-products in ecosystems involves risk of toxicity to environment and human health, a reliable quantitative method for simultaneous monitoring of these compounds is required. Hence, a simple method without preconcentration step was validated for quantitation of diuron and its main metabolites by high performance liquid chromatography with ultraviolet detection. Separation was achieved in less than 11 minutes using a C18 column, mobile phase composed of acetonitrile and water (45:55 v/v) at 0.86 mL...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticides; Degradation products; HPLC-UV; Soil; Environmental control.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401235

Benefits of caloric restriction in the myenteric neuronal plasticity in aging rats
Provedor de dados: 42
Autores: PEREIRA,JOICE N.B.; MARI,RENATA B.; STABILLE,SANDRA R.; FARIA,HAROLDO G. DE; MOTA,THAIS F.M.; FERREIRA,WALTER M.
Aging is a biologic process characterized by progressive damage of structures and functions of organic systems. In gastrointestinal tract, it can involve enteric nervous system, which plays an important role in digestion and absorption of nutrients, causing hastening of intestinal transit thus reducing its absorptive function. Caloric restriction has been used in several studies with the intention of delaying deleterious effects of aging. This study aimed to evaluate the effects of caloric restriction on myenteric neurons of ileum by aging in rats. 30 Wistar rats were grouped as follows: GI (animals aged 6 months fed with normal diet), GII (animals aged 18 months fed with normal diet) and GIII (animals aged 18 months subject to 31% of caloric restriction)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aging; Caloric restriction; Myenteric plexus; Small intestine.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301471

Inhibitory effect of Lonchocarpus araripensis lectin in rat acute models of inflammation
Provedor de dados: 42
Autores: PIRES,ALANA F.; MARQUES,GABRIELA F.O.; ALENCAR,NYLANE M.N. DE; MARTINS,MARIA G.Q.; SILVA,MAYARA T.L. DA; NASCIMENTO,KYRIA S. DO; CAVADA,BENILDO S.; ASSREUY,ANA MARIA S.
Abstract: Dalbergieae tribe lectins, possessing binding affinity for galactose and mannose, present inflammatory and nociceptive effects, while those for N-acetylglucosamine are anti-inflammatory. Since the anti-inflammatory effect of the seed lectin of L. araripensis (LAL) had been already demonstrated in mice, this effect was presently evaluated in rat models of acute inflammation. LAL (0.01-1 mg/kg) was administered by intravenous (i.v.) route in male Wistar rats 30 min before paw edema induction by dextran or carrageenan, and peritonitis by carrageenan. LAL (1 mg/kg) was incubated with N-acetylglucosamine for allowing lectin-sugar interactions before injection into animals. LAL toxicity was evaluated by the parameters: body mass, organs weight, stomach...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-inflammatory effect; Dalbergieae; Lectin domain; Leguminous lectin; Loncocharpus araripensis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300706

General aspects of muscle glucose uptake
Provedor de dados: 42
Autores: ALVIM,RAFAEL O.; CHEUHEN,MARCEL R.; MACHADO,SILMARA R.; SOUSA,ANDRÉ GUSTAVO P.; SANTOS,PAULO C.J.L.
Glucose uptake in peripheral tissues is dependent on the translocation of GLUT4 glucose transporters to the plasma membrane. Studies have shown the existence of two major signaling pathways that lead to the translocation of GLUT4. The first, and widely investigated, is the insulin activated signaling pathway through insulin receptor substrate-1 and phosphatidylinositol 3-kinase. The second is the insulin-independent signaling pathway, which is activated by contractions. Individuals with type 2 diabetes mellitus have reduced insulin-stimulated glucose uptake in skeletal muscle due to the phenomenon of insulin resistance. However, those individuals have normal glucose uptake during exercise. In this context, physical exercise is one of the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabetes; Exercise; Glucose uptake; Diet; Hypoglycemic drugs.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100351

Relation between the sedimentary organic record and the climatic oscilations in the Holocene attested by palynofacies and organic geochemical analyses from a pond of altitude in southern Brazil
Provedor de dados: 42
Autores: GADENS-MARCON,GABRIELLI T.; MENDONÇA-FILHO,JOÃO G.; GUERRA-SOMMER,MARGOT; CARVALHO,MARCELO A.; PIRES,ETIENE F.; HARTMANN,LÉO A.
This paper presents the quantitative and qualitative results obtained from palynofacies and geochemistry analyses carried out on a core covering approximately 8000 years of sedimentation of a pond of altitude located at the mining district of Ametista do Sul, southernmost Brazil. The main objective of this paper is to consider the paleoclimatic and paleoenvironmental significance of these analyses. The hydrological isolation renders this pond climatically sensitive to variations in pluviometric regime and this enabled infer rainfall events during the early Holocene, which was responsible for the beginning of the processes of water accumulation in the gossan and the sedimentation of the pond. Changes in the pattern of moisture over the time become the drier...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continental environment; Pond; Organic matter; Palynofacies analysis; Total organic carbon; Total sulfur.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301077

Studies on cambial activity: advances and challenges in the knowledge of growth dynamics of Brazilian woody species
Provedor de dados: 42
Autores: CALLADO,CÁTIA H.; VASCONCELLOS,THAÍS J. DE; COSTA,MONIQUE S.; BARROS,CLAUDIA F.; ROIG,FIDEL A.; TOMAZELLO-FILHO,MÁRIO.
The lack of specific research on the sequence of events that determine plant growth from meristem until wood formation represents a gap in the knowledge of growth dynamics in woody species. In this work, we surveyed published studies concerning cambial activity of Brazilian native species aiming at allowing the comparison of applied methods and obtained results. The annual cambial seasonality was observed in all the investigated species. Nevertheless, we found high heterogeneity in the used methodologies. As a result from this analysis, our opinion points to the need for standardizing sampling protocols and for discussing the suitability of experimental designs. This will help to define with greater precision the factors that determine the radial growth in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wood formation; Growth rings; Radial growth; Dendrochronology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100277

Embryonic hybrid cells: a powerful tool for studying pluripotency and reprogramming of the differentiated cell chromosomes
Provedor de dados: 42
Autores: SEROV,OLEG; MATVEEVA,NATALIA; KUZNETSOV,SERGEY; KAFTANOVSKAYA,ELENA; MITTMANN,JOSANE.
The properties of embryonic hybrid cells obtained by fusion of embryonic stem (ES) or teratocarcinoma (TC) cells with differentiated cells are reviewed. Usually, ES-somatic or TC-somatic hybrids retain pluripotent capacity at high levels quite comparable or nearly identical with those of the pluripotent partner. When cultured in vitro, ES-somatic- and TC-somatic hybrid cell clones, as a rule, lose the chromosomes derived from the somatic partner; however, in some clones the autosomes from the ES cell partner were also eliminated, i.e. the parental chromosomes segregated bilaterally in the ES-somatic cell hybrids. This opens up ways for searching correlation between the pluripotent status of the hybrid cells and chromosome segregation patterns and therefore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ES cells; EG cells; Hybrid cells; Pluripotency; Reprogramming.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400009

Reduction of the DNA damages, Hepatoprotective Effect and Antioxidant Potential of the Coconut Water, ascorbic and Caffeic Acids in Oxidative Stress Mediated by Ethanol
Provedor de dados: 42
Autores: BISPO,VANDERSON S.; DANTAS,LUCAS S.; CHAVES FILHO,ADRIANO B.; PINTO,ISABELLA F.D.; SILVA,RAILMARA P. DA; OTSUKA,FELIPE A.M.; SANTOS,RODRIGO B.; SANTOS,ALINE C.; TRINDADE,DANIELLE J.; MATOS,HUMBERTO R.
ABSTRACT Hepatic disorders such as steatosis and alcoholic steatohepatitis are common diseases that affect thousands of people around the globe. This study aims to identify the main phenol compounds using a new HPLC-ESI+-MS/MS method, to evaluate some oxidative stress parameters and the hepatoprotective action of green dwarf coconut water, caffeic and ascorbic acids on the liver and serum of rats treated with ethanol. The results showed five polyphenols in the lyophilized coconut water spiked with standards: chlorogenic acid (0.18 µM), caffeic acid (1.1 µM), methyl caffeate (0.03 µM), quercetin (0.08 µM) and ferulic acid (0.02 µM) isomers. In the animals, the activity of the serum γ-glutamyltranspeptidase (γ-GT) was reduced to 1.8 I.U/L in the coconut...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coconut water; Ethanol; Oxidative stress; Phenolic compounds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301095

All publishers are predatory - some are bigger than others
Provedor de dados: 42
Autores: AMARAL,OLAVO B.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elsevier; Peer review; Preprint; Science Policy; Science Evaluation; Scientific Publishing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401643

Invertebrate herbivory on floating-leaf macrophytes at the northeast of Argentina: should the damage be taken into account in estimations of plant biomass?
Provedor de dados: 42
Autores: MARTÍNEZ,FEDRA S.; FRANCESCHINI,CELESTE.
ABSTRACT: We assessed the damage produced by invertebrate herbivores per leaf lamina and per m2 of populations floating-leaf macrophytes of Neotropical wetlands in the growth and decay periods, and assessed if the damage produced by the herbivores should be taken into account in the estimations of plant biomass of these macrophytes or not. The biomass removed per lamina and per m2 was higher during the growth period than in decay period in Nymphoides indica and Hydrocleys nymphoides, while Nymphaea prolifera had low values of herbivory in growth period. During decay period this plant is only present as vegetative propagules. According to the values of biomass removed per m2 of N. indica, underestimation up to 17.69% should be produced in cases that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant damage; Herbivores; Nymphoides; Nymphaea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100155

Feeding and larval growth of an exotic freshwater prawn Macrobrachium equidens (Decapoda: Palaemonidae), from Northeastern Pará, Amazon Region
Provedor de dados: 42
Autores: GOMES,JEAN N.; ABRUNHOSA,FERNANDO A.; COSTA,ANNE K.; MACIEL,CRISTIANA R.
In the present study, we carried out experiments on the diet of the freshwater prawn Macrobrachium equidens. We tested which type of food and which density of food is suitable for larval development. For the experiment on the type of food, eight treatments were carried out: (I) starvation, (AL) microalgae, (RO) rotifers, (AN) Artemia, (RO + AN) rotifers + Artemia, (AL + RO) microalgae + rotifers, (AL + AN) microalgae + Artemia, (AL + RO + AN) microalgae + rotifers + Artemia. For the experiment on the density of food, we used the type of food, which had resulted in a high survival rate in the previous experiment. Three treatments were carried out: 4, 8 and 16 Artemia nauplii /mL. The rate of feeding during larval development was observed. The survival,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palaemonidae; Diet; Food preference; Live food.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301525

In vitro trypanocidal activity of solamargine and extracts from Solanum palinacanthum and Solanum lycocarpum of brazilian cerrado
Provedor de dados: 42
Autores: MOREIRA,RAQUEL R.D.; MARTINS,GILMARCIO Z.; MAGALHÃES,NATHÁLIA O.; ALMEIDA,ADÉLIA E.; PIETRO,ROSEMEIRE C.L.R.; SILVA,FLÁVIA A. J.; CICARELLI,REGINA M.B.
The present investigation was to evaluate the potential trypanocidal activity of crude ethanolic extract of the fruits of Solanum palinacanthum, Solanum lycocarpum and the glycoalcaloid, solamargine. S. palinacanthum and S. lycocarpum fruit powders were submitted to exhaustively extraction with 96% ethanol and solamargine were isolated from the extract of S. palinacanthum. Both extracts and solamargine were analysed for trypanocidal activity by using MTT colorimetric assay. Extracts of S. palinacanthum showed to be more active (IC50 = 175.9 µg.ml–1) than S. lycocarpum (IC50 = 194.7 µg.ml–1). Solamargine presented a strong activity (IC50 = 15.3 µg.ml–1), which can explain the better activity of the both extracts. Benznidazol (IC50 = 9.0 µg.ml–1) is the only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum palinacanthum; Solanum lycocarpum; Solamargine; Epimastigote; Antitrypanosomal activity; Trypanosoma cruzi.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300903

Accuracy of immunoglobulin M and immunoglobulin A of saliva in early diagnosis of dengue: Systematic Review and Meta-analysis
Provedor de dados: 42
Autores: COLONETTI,TAMY; ROCHA,BELISE V.E.; GRANDE,ANTÔNIO J.; ALEXANDRE,MARIA C.M.; DONDOSSOLA,EDUARDO R.; MADEIRA,KRISTIAN; ROSA,MARIA I.
ABSTRACT The objective of the study was to conduct a systematic review to synthesize the current evidence on the accuracy of IgM and IgA to early diagnosis the dengue virus. The review protocol was registered at PROSPERO (CRD 42015024808). We searched for studies in the following electronic database from 1990 to January 2018. The search identified 3507 studies. Five studies were included for quantitative analysis. Three studies included evaluations of salivary IgM provided a sensitivity of 86% and specificity of 93%. Two studies included evaluating of IgA salivary showed a combined sensitivity of 69% and a combined specificity of 98%. Despite the results found and the low methodological quality of the studies included in the meta-analysis it is still soon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Immunoglobulin M; Immunoglobulin A; Antibodies; Dengue virus; Diagnosis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603147

Saprobic conidial fungi associated with palm leaf litter in eastern Amazon, Brazil
Provedor de dados: 42
Autores: MONTEIRO,JOSIANE S.; SARMENTO,PRISCILA S.M.; SOTÃO,HELEN M.P.
Abstract: Fungi play an important role in litter decomposition in forest ecosystems and are considered an undersampled group in the Amazon biome. This study aims to describe the composition, richness and frequency of species of conidial fungi associated with palm trees in an area of ​​the Amapá National Forest, State of Amapá, Brazil. Palm leaf litter was collected from July 2009 to June 2010, incubated in moist chambers and examined for the presence of fungi. One hundred and seven species of conidial fungi were identified, in 79 genera and 25 families. As for the relative frequency of the species, the majority (94.4%) was sporadic and occurred on leaflets. We report new records for South America (Chaetopsis intermedia, Chaetochalara laevis and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asexual Ascomycota; Arecaceae; Biodiversity; Flona Amapá; Taxonomy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500602

Plate motions, Gondwana Dinosaurs, Noah's Arks, Beached Viking Funeral Ships, Ghost Ships, and Landspans
Provedor de dados: 42
Autores: Jacobs,Louis L.; Strganac,Christopher; Scotese,Christopher.
Gondwana landmasses have served as large-scale biogeographic Noah's Arks and Beached Viking Funeral Ships, as defined by McKenna. The latitudinal trajectories of selected Gondwana dinosaur localities were traced through time in order to evaluate their movement through climate zones relative to those in which they originally formed. The dispersal of fauna during the breakup of Gondwana may have been facilitated by the presence of offshelf islands forming landspans (sensu Iturralde-Vinent and MacPhee) in the Equatorial Atlantic Gateway and elsewhere.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeography; Dinosaur; Gondwana; Latitude.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100002

Extrusion-related extensional signatures under high-pressure nappe compressional regime
Provedor de dados: 42
Autores: CARVALHO,CARLOS H. G.; CAMPOS-NETO,MARIO C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300019

Morphological and histological characterization of sexual segment of the kidney in Notomabuya frenata (Cope, 1862) and Aspronema dorsivittatum (Cope, 1862) (Squamata, Mabuyidae)
Provedor de dados: 42
Autores: NOVELLI,IARA A.; OLIVEIRA,PAOLA R. DE; CASTAÑON,MARIA CHRISTINA M.N.; SILVA,PILAR C.; SOUSA,BERNADETE M. DE.
Abstract The kidneys in two viviparous species of Neotropical lizards, Notomabuya frenata and Aspronema dorsivittatum (Mabuyidae), were investigated by light and scanning electron microscopy in order to determine the presence of the sexual segment of the kidney (SSK) and to study its morphology. The individuals used in this study belong to the Herpetological Collection of the Herpetology Laboratory - Reptiles of the Federal University of Juiz de Fora (CHUFJF-Reptiles) and they were collected between the years 2008 and 2012 from the Cerrado region in the state of Minas Gerais, Brazil. The SSK was present only in sexually mature males (with sperm in the testes / epididymis), whereas it was absent in sexually immature males. The nephron in both species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accessory organ; Reproduction; Secretion granules; Skinks; Urogenital system.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502267

Competition between rice (Oryza sativa L.) and (barnyardgrass (Echinochloa crus-galli (L.) P. Beauv.) as affected by methanol foliar application
Provedor de dados: 42
Autores: Rezaeieh,Alireza D.; Aminpanah,Hashem; Sadeghi,Seyed M.
Pot experiment was conducted in Iran, to evaluate the effect of methanol on competition between rice (Oryza sativa) and barnyardgrass (Echinochloa crus-galli). The experiment was conducted as a randomized complete block design with a factorial treatment arrangement and three replicates. Factors were two aqueous methanol foliar applications (0, and 14% v/v) and five rice: barnyardgrass ratios (100:0, 75:25, 50:50, 25:6, and 0:100). Replacement series diagrams for aboveground dry weight illustrated that 'Shiroudi' was more competitive than barnyardgrass as averaged across methanol foliar applications. When methanol was not sprayed, the lines for 'Shiroudi' and barnyardgrass intersected at 75:25 rice: barnyardgrass ratio, but when methanol was sprayed at 14%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barnyardgrass; Interference; Methanol; Rice.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200879

The scientific literature on Limnoperna fortunei (Dunker 1857) from 1982 to 2012
Provedor de dados: 42
Autores: BARBOSA,FABIANA G.
Limnoperna fortunei (golden mussel) is a freshwater bivalve native to Southeast Asia, but is becoming an invasive species in several aquatic ecosystems in the world. In this study, a scientometric analysis was performed to identify the patterns, trends and gaps of knowledge for this invasive species. A survey of the published literature was conducted using the database of the Thomson Institute for Scientific Information (ISI). A total of 107 papers were surveyed that were published between 1982 and 2012 in 60 journals. The number of papers on L. fortunei over the years has increased, especially within the last eight years of the study period. Argentina, Brazil, and Japan are the countries that contributed the most papers to the literature on invasive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological invasions; Golden mussel; Scientific production; Scientometric analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301373

Origin and preservation of stratigraphically repeated, glacially striated surfaces in the Itararé Subgroup (Late Paleozoic) in Palmeira, State of Paraná
Provedor de dados: 42
Autores: TROSDTORF JUNIOR,IVO; ROCHA-CAMPOS,ANTONIO C.; TOMIO,ALEXANDRE; SANTOS,PAULO R.; CANUTO,JOSÉ R.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300024

Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology
Provedor de dados: 42
Autores: CASTRO,SUSAN P.; CARVALHO,MARCELO A.
To better understand the paleoenvironments of the lower-middle Santonian, dinocyst data were obtained from the Santa Marta Formation, Larsen Basin, James Ross Island, Antarctic Peninsula. This study provides the first available quantitative dinocyst data for the Santa Marta Formation, which should more clearly reflect detailed changes in paleoenvironments, as recorded by fluctuations in diversity and abundance. To record the Santonian dinocyst assemblages from the Larsen Basin, 30 samples from an outcrop of the Lachman Crags Member (LC section) were analyzed. These assemblages are dominated by peridiniacean dinocysts typical of the Isabelidinium flora. A lower-middle Santonian age was determined after the recognition of Odontochitina poriferaand...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Santonian dinocysts; Antarctica; Cretaceous; Santa Marta Formation; Dinocyst blooms.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401583

Use of glass transition temperature for stabilization of board's cracks of Eucalyptus grandis
Provedor de dados: 42
Autores: Calonego,Fred W.; Severo,Elias T.D.; Cunha,Antonio R.; Gaia,Daiane C.
The Eucalyptus grandis logs temperatures were determined and correlated with the board's cracks during steaming. Thermocouples were inserted in the logs center, registering their temperatures during steaming at 90"C. The logs were sawed and the board's cracks measured. It was concluded that: (1) the logistic S-shaped curve explains the logs temperature variation; (2) the logs with diameter of 20 to &lt;25, 25 to &lt;30 and 30 to &lt;35 cm presented, respectively, 84.2"C, 73.1"C and 45.8"C in the steaming; and (3) the cracks lengths significantly decreased in logs that reached the glass transition temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Board's cracks; Eucalyptus grandis; Glass transition temperature; Logs steaming.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300025

Vocal sequential exchanges and intragroup spacing in the Northern Muriqui Brachyteles arachnoides hypoxanthus
Provedor de dados: 42
Autores: Mendes,Francisco D.C.; Ades,César.
Sequential exchanges of vocalizations (staccatos and neighs) emitted by Northern Muriquis Brachyteles arachnoides hypoxanthus were recorded at the Biological Station of Caratinga, Minas Gerais State, Brazil. Staccatos and neighs containing larger proportion of short elements were preferentially produced during short-range exchanges; neighs, produced by a larger number of participants, were typical of long-range exchanges. Staccatos emitted by animals feeding in a dispersed manner contained a larger proportion of tonal elements than those emitted by muriquis feeding in a cohesive manner. Sequential exchanges seem thus to be constituted by two inter-related subsystems of calls that aid muriquis to coordinate intragroup spacing, despite the poor visibility of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal communication; Signal exchange; Vocal sequences; Intragroup spacing; Muriqui.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200032

Hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil
Provedor de dados: 42
Autores: RODRIGUES,THIAGO R.; CURADO,LEONE F.A.; PEREIRA,VINICIUS M.R.; SANCHES,LUCIANA; NOGUEIRA,JOSÉ S.
ABSTRACT Matter and energy flux dynamics of wetlands are important to understand environmental processes that govern biosphere-atmosphere interactions across ecosystems. This study presents analyses about hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil. This study was conducted in Private Reserve of Natural Heritage (PRNH SESC, 16º39'50''S; 56º47'50''W) in Brazilian Wetland. According to Curado et al. (2012), the wet season occurs between the months of January and April, while the June to September time period is the dry season. Results presented same patterns in energies fluxes in all period studied. Wind speed and air temperature presented same patterns, while LE was relative humidity presented inverse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy balance; Latent heat flux; Linear regression; Micrometeorology; Pantanal; Sensible heat flux.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602195

The current status of the New World monkey phylogeny
Provedor de dados: 42
Autores: SCHNEIDER,HORACIO.
Four DNA datasets were combined in tandem (6700 bp) and Maximum parsimony and Neighbor-Joining analyses were performed. The results suggest three groups emerging almost at the same time: Atelidae, Pitheciidae and Cebidae. The total analysis strongly supports the monophyly of the Cebidae family, grouping Aotus, Cebus and Saimiri with the small callitrichines. In the callitrichines, the data link Cebuela to Callithrix, place Callimico as a sister group of Callithrix/Cebuella, and show Saguinus to be the earliest offshoot of the callitrichines. In the family Pithecidae, Callicebus is the basal genus. Finally, combined molecular data showed congruent branching in the atelid clade, setting up Alouatta as the basal lineage and Brachyteles-Lagothrix as a sister...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: New World monkeys; Platyrrhine; Taxonomy; Molecular; Evolution.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200005

A pterodactyloid pterosaur from the Upper Cretaceous Lapurr sandstone, West Turkana, Kenya
Provedor de dados: 42
Autores: O'Connor,Patrick M.; Sertich,Joseph J.W.; Manthi,Fredrick K.
An isolated pterosaurian caudal cervical (~ postcervical) vertebra was recovered from the Upper Cretaceous Lapurr sandstone ofWest Turkana, northwestern Kenya. The vertebral centrum is short, wide, and dorsoventrally compressed. Although the specimen is lightly built similar to most pterosaurs, it is here referred to Pterodactyloidea and tentatively to the Azhdarchidae in that it lacks pneumatic features on both the centrum and neural arch. This represents one of the few pterosaurs recovered from the entirety of Afro-Arabia, the first pterosaur recovered from the Cretaceous of East Africa, and, significantly, a specimen that was recovered from fluvial deposits rather than the near-shore marine setting typical of most pterosaur discoveries.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Pterodactyloidea; Africa; Kenya; Late Cretaceous.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100019

Determinism, chaos, self-organization and entropy
Provedor de dados: 42
Autores: PONTES,JOSÉ.
ABSTRACT We discuss two changes of paradigms that occurred in science along the XXth century: the end of the mechanist determinism, and the end of the apparent incompatibility between biology, where emergence of order is law, and physics, postulating a progressive loss of order in natural systems. We recognize today that three mechanisms play a major role in the building of order: the nonlinear nature of most evolution laws, along with distance to equilibrium, and with the new paradigm, that emerged in the last forty years, as we recognize that networks present collective order properties not found in the individual nodes. We also address the result presented by Blumenfeld (L.A. Blumenfeld, Problems of Biological Physics, Springer, Berlin, 1981) showing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaos; Dynamical systems; Entropy; Evolution of Science; Pattern formation; Theoretical biology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301151

Gondwana biogeography: a phylogenetic approach
Provedor de dados: 42
Autores: AVILLA,LEONARDO S.; CANDEIRO,CARLOS R.A.; BUCKUP,PAULO A.; BERGQVIST,LÍLIAN P.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200018

Hepcidin is a useful biomarker to evaluate hyperferritinemia associated with metabolic syndrome
Provedor de dados: 42
Autores: RAUBER,MARIANA R.; PILGER,DIOGO A.; CECCONELLO,DAIANE K.; FALCETTA,FREDERICO S.; MARCONDES,NATÁLIA A.; FAULHABER,GUSTAVO A.M.
Abstract: Investigation of hyperferritinemia in metabolic syndrome patients represents a diagnostic challenge, but it is essential for the identification of individuals with iron overload. Hepcidin negatively regulates iron absorption and release. An increase in hepcidin occurs when iron levels are sufficient or in inflammatory states, conditions often associated with hyperferritinemia. Hemochromatosis causes hyperferritinemia due to iron overload, but frequently has low hepcidin levels. Our aim was to evaluate biochemical and molecular parameters related to iron metabolism in patients with metabolic syndrome. We evaluated 94 patients with metabolic syndrome according to the International Diabetes Federation criteria in a cross-sectional study....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diagnostic screening; Ferritin; Hepcidin; Iron; Metabolic syndrome.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300803

Development of the banana plants 'Prata Anã' and 'FHIA-01' under the effect of paclobutrazol applied on the soil
Provedor de dados: 42
Autores: Maia,Emanuel; Siqueira,Dalmo L.; Salomão,luiz C.C.; Peternelli,Luiz A.; Ventrella,Marília C.; Cavatte,Rithiely P.Q.
Under some cultivation conditions, excessive growth of the pseudostem of banana plants can be considered a limiting factor, and thus, the use of growth regulators can constitute a valid alternative. This work aimed to evaluate the action of paclobutrazol on the growth of the pseudostem of banana plants and other characteristics of their development. An experiment was installed with five paclobutrazol doses (0; 0.5; 1.0; 1.5; and 2.0 g of a.i. plant-1) combined with two banana plant cultivars ('Prata Anã' and 'FHIA-01'). Paclobutrazol did not affect the number of days from planting to flowering, total leaf area and leaf emission rate. However, it increased leaf permanence on the plants and sucker number, reduced the foliar area of the leaves emitted after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foliar area; Growth analysis; Growth regulator; Musa spp.; Suckers.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200011

Intercalation compounds involving inorganic layered structures
Provedor de dados: 42
Autores: CONSTANTINO,VERA R. L.; BARBOSA,CÉSAR A. S.; BIZETO,MARCOS A.; DIAS,PATRÍCIA M.
Two-dimensional inorganic networks can shown intracrystalline reactivity, i.e., simple ions, large species as Keggin ions, organic species, coordination compounds or organometallics can be incorporated in the interlayer region. The host-guest interaction usually causes changes in their chemical, catalytic, electronic and optical properties. The isolation of materials with interesting properties and making use of soft chemistry routes have given rise the possibility of industrial and technological applications of these compounds. We have been using several synthetic approaches to intercalate porphyrins and phthalocyanines into inorganic materials: smectite clays, layered double hydroxides and layered niobates. The isolated materials have been characterized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intercalation compounds; Layered double hydroxides; Smectite clays; Layered niobates.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100006

Sodium pumps in the Malpighian tubule of Rhodnius sp.
Provedor de dados: 42
Autores: CARUSO-NEVES,CELSO; LOPES,ANÍBAL GIL.
Malpighian tubule of Rhodnius sp. express two sodium pumps: the classical ouabain-sensitive (Na+ + K+)ATPase and an ouabain-insensitive, furosemide-sensitive Na+-ATPase. In insects, 5-hydroxitryptamine is a diuretic hormone released during meals. It inhibits the (Na+ + K+)ATPase and Na+ -ATPase activities indicating that these enzymes are involved in fluid secretion. Furthermore, in Rhodnius neglectus, proximal cells of Malpighian tubule exposed to hyperosmotic medium, regulate their volume through a mechanism called regulatory volume increase. This regulatory response involves inhibition of the (Na+ + K+)ATPase activity that could lead to accumulation of active osmotic solute inside the cell, influx of water and return to the normal cell volume....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighian tubule; (Na+ + K+)ATPase; Na+ -ATPase; Fluid secretion; Adenosine; 5-hydroxitryptamine.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300014

The role of backstop shape during inversion tectonics physical models
Provedor de dados: 42
Autores: Gomes,Caroline J.S.; Danderfer Filho,André; Posada,Ana Maria A.; Silva,Anielle C. da.
The style of deformation of rocks from basin-infilling sequences in positively inverted natural basins was discussed upon the results of laboratory experiments carried out in sandboxes with sand packs laid down in the space between two wooden blocks. The space simulated stages of crustal extension leading to (1) a half graben due to extension above a listric extensional detachment, with the blocks simulating the footwall and hanging wall, or (2) a graben, with the blocks simulating the external margins that drifted apart above a horizontal detachment. Combinations of two different angles were used to simulate the dip of curved normal faults along the internal face of the wooden blocks. Backstops in the half graben had a convex up internal face. Backstops...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analogue models; Backstop geometry; Buttress effect; Inversion tectonics; Normal detachment reactivation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400021

Palynological analysis of Sphaeropteris gardneri (Cyatheaceae, Pteridophyta)
Provedor de dados: 42
Autores: Marquez,Gonzalo J.; Morbelli,Marta A.; Giudice,Gabriela E.
The spore morphology and wall ultrastructure of Sphaeropteris gardneri (Hook.) R.M. Tryon from Brazil were analyzed with LM, SEM and TEM. The spores are trilete with an ornamentation formed of short low ridges with spines in their margins. The exospore is 2.5μm thick, two- layered in section and single or branched channels are present. The perispore is 1.2μm thick and two-layered. The inner layer has three strata: the inner stratum is formed of a network of branched and fused threads, the middle stratum has threads with a radial orientation and in the outer stratum thin, dark fibres are immersed in a less dense contrasted matrix. The outer layer of the perispore is the one that forms the echinate-ridges and is constituted of threads arranged in a compact...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sphaeropteris; Spores; Morphology; Ultrastructure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200012

A multidisciplinary approach to the study of the fluminense vegetation
Provedor de dados: 42
Autores: KELECOM,ALPHONSE; REIS,GEISA L.; FEVEREIRO,PAULO C.A.; SILVA,JANIE G.; SANTOS,MARCELO G.; MELLO NETO,CÍCERO B.; GONZALEZ,MARCELO S.; GOUVEA,RITA C.S.; ALMEIDA,GILBERTO S.S.
The fluminense vegetation, more specifically the flora from the Jurubatiba restinga has been investigated by a multidisciplinary team of botanists, chemist, radiobiologist, insect physiologists and geneticist. Vouchers of 564 specimens have been collected, identified, organized in an herbarium, and a database is being build up containing, in addition to classical botanical data, chemical data and information on the potential economic use either for landscape gardening, alternative foods or as medicinal plants. Phytochemical studies of the Guttiferae, Clusia hilariana, yielded oleanolic acid and nemorosone. Their biological activities against the haematophagous insect Rhodnius prolixus vector of Chagas disease have been investigated. Finally, it has been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Economic use; Oleanolic acid; Nemorosone; Polonium-210; Biological activities.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100013

Overview of genotypic and clinical profiles of human immunodeficiency virus type 1-infected children in Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Machado,Elizabeth S.; Lambert,John S.; Afonso,Adriana O.; Cunha,Silvia M.; Oliveira,Ricardo H.; Tanuri,Amilcar; Sill,Anne M.; Soares,Marcelo A.
Although mother-to-child HIV transmission prevention has slowed down pediatric HIV infection in developed countries, large numbers of infants still become infected in developing nations. Data on pediatric HIV infection is however largely scarce. In this study, we have overviewed clinical, laboratory and genotypic data from a large cohort of HIV-infected infants regularly followed at two pediatric HIV outpatient clinics in Rio de Janeiro, Brazil. Children on antiretroviral therapy, as well as drug-naïve, newly diagnosed infants were analyzed. Prevalence of drug resistance mutations, as well as immunological and virological responses to therapy were evaluated. Additionally, HIV-1 subtype frequencies and their distribution over the course of the epidemic were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV-1; Pediatric; Drug resistance; Clinical; Genotyping; Subtype.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400008

Chemical composition, botanical evaluation and screening of radical scavenging activity of collected pollen by the stingless bees Melipona rufiventris (Uruçu-amarela)
Provedor de dados: 42
Autores: Silva,Tania M.S.; Camara,Celso A.; Lins,Antonio C.S.; Agra,Maria de Fátima; Silva,Eva M.S.; Reis,Igor T.; Freitas,Breno M.
Stingless bees in Brazil are indigenous and found all over the country. Bee pollen is used for its nutritional value in the human diet. It is made up of natural flower pollen mixed with nectar and bee secretions. In order to evaluate the chemical composition, free radical scavenging activity, and botanical origin, sample of pollen loads from stingless bee, Melipona rufiventris (Uruçu amarela) was studied. The EtOAc extract of pollen of Melipona rufiventris yielded the following compounds: p-hydroxycinnamic acid, dihydroquercetin, isorhamnetin, isorhamnetin3-O-(6"-O-E-p-coumaroyl)-β-D-glucopyranoside, luteolin, and quercetin. This is the first report of the isolation of isorhamnetin3-O-(6"O-E-p-coumaroyl)β-D-glucopyranoside from pollen. The free...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant activity; Bee pollen; Flavonoids; Melipona rufiventris; Uruçu amarela.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200003

7-epi-griffonilide, a new lactone from Bauhinia pentandra: complete 1H and 13C chemical shift assignments
Provedor de dados: 42
Autores: ALMEIDA,MACIA C.S. DE; SOUZA,LUCIANA G.S.; FERREIRA,DANIELE A.; PINTO,FRANCISCO C.L.; OLIVEIRA,DÉBORA R. DE; SANTIAGO,GILVANDETE M.P.; MONTE,FRANCISCO J.Q.; BRAZ-FILHO,RAIMUNDO; LEMOS,TELMA L.G. DE.
ABSTRACT A new lactone, 7-epi-griffonilide (1), and six known compounds, 2, 3a - 3c, 4a and 4b, were isolated from the leaves of Bauhinia pentandra (Fabaceae). The structures elucidation of 1 and 2 were based on detailed 2D NMR techniques and spectral comparison with related compounds, leading to complete assignment of the 1H and 13C NMR spectra.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bauhinia pentandra; Fabaceae; Cyanoglucoside; Lactones; RMN.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100065

Pollen record and paleoenvironment of a 4210 years B.P.old sediment in the Bay of Guanabara, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Barth,Ortrud M.; Barreto,Cíntia F.; Coelho,Luciane G.; Luz,Cynthia F.P.
Pollen analysis of a sediment sample obtained at 222 cm from the top of a drilling core collected in the Bay of Guanabara, Rio de Janeiro, was used as a tool to obtain more knowledge about pre-historical human living and environment. 14C datation revealed the age of 4210 years B.P. Most frequent pollen grains came from plants like Alchornea (Euphorbiaceae), Celtis (Ulmaceae), Lecythidaceae, Meliaceae, Ochnaceae and spores from forest Pteridophyta. Palynology and environmental studies revealed that agricultural activities could not be detected. The dense tropical rain forest was the dominant vegetation occurring in this region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen; Paleoenvironment; Guanabara Bay; Rio de Janeiro; 4210 BP.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300009

Geostatistical Approach for Spatial Interpolation of Meteorological Data
Provedor de dados: 42
Autores: OZTURK,DERYA; KILIC,FATMAGUL.
ABSTRACT Meteorological data are used in many studies, especially in planning, disaster management, water resources management, hydrology, agriculture and environment. Analyzing changes in meteorological variables is very important to understand a climate system and minimize the adverse effects of the climate changes. One of the main issues in meteorological analysis is the interpolation of spatial data. In recent years, with the developments in Geographical Information System (GIS) technology, the statistical methods have been integrated with GIS and geostatistical methods have constituted a strong alternative to deterministic methods in the interpolation and analysis of the spatial data. In this study; spatial distribution of precipitation and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistical interpolation; Geographic information system; Ordinary kriging; Meteorological data.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602121

Probiotic level effects on growth performance, carcass traits, blood parameters, cecal microbiota, and immune response of broilers
Provedor de dados: 42
Autores: POURAKBARI,MOHAMMADREZA; SEIDAVI,ALIREZA; ASADPOUR,LEILA; MARTÍNEZ,ANDRÉS.
Probiotic effects on growth performance, carcass traits, blood parameters, cecal microbiota, and immune response of broilers were studied. Two hundred one-day-old male chickens were allocated to one of five treatments (four replicates of 10 birds per treatment): control, and the same control diet supplemented with 0.005%, 0.01%, 0.015% and 0.02% probiotics. Probiotics in feed at 0.01% or higher levels of supplementation improved body weight gain (+12%) and feed conversion rate (-5%) compared with the control. There were no effects on carcass traits, but the relative weights of drumsticks and wings showed increasing and decreasing linear responses, respectively, to probiotic supplementation level. Blood plasma glucose and albumin contents linearly increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestion; Immunity; Poultry; Probiotics; Production.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301011

EDITORIAL NOTE: Collection of Paleontology Papers in honor of the Centenary of the Brazilian Academy of Sciences
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.; SOARES,MARINA B.
Tipo: Info:eu-repo/semantics/other
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400101

Materials from renewable resources: new properties and functions
Provedor de dados: 42
Autores: GALEMBECK,FERNANDO; BURGO,THIAGO A.L.; SILVA,DOUGLAS S. DA; SANTOS,LEANDRA P.
Abstract: Sustainable production requires increasing use of raw materials from renewable sources, processed under mild conditions with minimal effluent production. These requirements are satisfied by using materials derived from biomass, in synergy with food and energy production. The possibilities of biomass are continuously enlarged by new findings, as in the intrinsic nanocomposite properties of natural rubber and the amphiphile behavior of cellulose that translated into new functional materials, including high-performance, flexible and conductive non-metallic materials. Other findings are allowing a better understanding of electrostatic phenomena that play a positive role in electrostatic adhesion and cohesion of nanocomposites made from biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulose; Electrostatics; Nanocomposites; Natural rubber.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700401

Ground level photosynthetically active radiation dynamics in stands of Acacia mearnsii De Wild
Provedor de dados: 42
Autores: PÉLLICO NETTO,SYLVIO; SANQUETTA,CARLOS R.; CARON,BRAULIO O.; BEHLING,ALEXANDRE; SIMON,AUGUSTO A.; CORTE,ANA PAULA D.; BAMBERG,ROGÉRIO.
ABSTRACTThe objective is to study the dynamics of photosynthetic radiation reaching the soil surface in stands of Acacia mearnsii De Wild and its influence on height growth in stands. This fact gives rise to the formulation of the following hypothesis for this study: "The reduction of the incidence of light inside the stand of black wattle will cause the inflection point in its height growth when this reaches 4 to 5 m in height, i.e. when the stand is between 2 and 3 years of age". The study was conducted in stands in the state of Rio Grande do Sul, Brazil, where diameters at breast height, total height and photosynthetically active radiation available at ground level were measured. The frequency tended to be more intense when the age of the stands...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burr function; Light intensity; Probabilistic models; Temporal variation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401833

Coherent structures in wall-bounded turbulence
Provedor de dados: 42
Autores: Dennis,David J.C.
The inherent difficulty of understanding turbulence has led to researchers attacking the topic in many different ways over the years of turbulence research. Some approaches have been more successful than others, but most only deal with part of the problem. One approach that has seen reasonable success (or at least popularity) is that of attempting to deconstruct the complex and disorganised turbulent flow field into to a set of motions that are in some way organised. These motions are generally called "coherent structures". There are several strands to this approach, from identifying the coherent structures within the flow, defining their characteristics, explaining how they are created, sustained and destroyed, to utilising their features to model the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Turbulence; Wall bounded flows; Coherent structures; Particle image velocimetry.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201161

Morphology and anatomy of the diaspores and seedling ofPaspalum (Poaceae, Poales)
Provedor de dados: 42
Autores: EICHEMBERG,MAYRA T.; SCATENA,VERA L.
ABSTRACTThe knowledge regarding of the diaspore and post-seminal development ofPaspalum L. is important for grassland biodiversity conservation, based on their representativeness and genetic improvement of forage. The morphology of the diaspore and the post-seminal development of Paspalum dilatatum Poir. (rhizomatous),P. mandiocanum Trin. var. subaequiglume Barreto (stoloniferous), P. pumilum Nees. (decumbent caespitose) andP. urvillei Steud. (erect caespitose) was described to distinguish species with different growth forms and to survey the characters useful for taxonomy. P. dilatatum differs by presenting oval diaspores larger than the others, with five prominent nerves and trichomes; P. urvillei presents diaspores with one central nerve that is more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caryopsis; Embryo; Forage; Germination; Grass.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401389

Middle Cretaceous palynological assemblages rich in copepod eggs: their paleoecological significance
Provedor de dados: 42
Autores: ARAI,MITSURU.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200025

Engineering biodiversity as a model for the species conservation
Provedor de dados: 42
Autores: RECH,ELIBIO L.
Abstract: Early humans have domesticated plant and animal species based on ancient empirical concepts (Darwin 1868, 1876). In 1886, Mendel established a new paradigm of hereditary laws (Mendel 1866, 1870, 1950) based on genotypic and phenotypic traits of cross-compatible species, establishing a complex breeding technology that is currently utilized for the development of most food and livestock-derived products. Recently, studies on deciphering the double-helical structure (Watson and Crick 1953a, b) and how to restrict DNA (Arber 2012) have established the foundation of recombinant DNA technology. A new era is paving the way for genetic manipulation of important traits among all the kingdom’s organisms, allowing for the development of innovative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Species conservation; DNA; Genetic engineering.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600617

Unraveling the genetic complexity of a cultivated breeding population of “yerba mate” (Ilex paraguariensis St. Hil.)
Provedor de dados: 42
Autores: PAIVA,DANIELA IVANA; CASCALES,JIMENA; ROSETTI,MARÍA EVA NATALIA; SCHERER,RAFAEL ALEJANDRO; GAUCHAT,MARÍA ELENA; GOTTLIEB,ALEXANDRA MARINA.
Abstract  We report the first comprehensive multilocus molecular characterization of cultivated Ilex paraguariensis plants belonging to a breeding program. Using nuclear and homologous chloroplastidic molecular markers, we have genotyped 158 plants from four plantation sites. Analyses of the nuclear data (187 variable dominant loci) allowed detecting high diversity (0.569), the occurrence of four distinct genetic clusters, and a low but significant differentiation among sites. Additionally, 20 chloroplastidic alleles were identified applying five microsatellite polymorphic markers, and a high chloroplastidic diversity was recognized (0.505); two haplogroups were distinguished amongst the 63 haplotypes detected. Our results from both nuclear and plastidic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chloroplastidic microsatellites; Genetic diversity; Genotyping; ISSR markers.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100717

Production, purification and characterization of an exo-polygalacturonase from Penicillium janthinellum sw09
Provedor de dados: 42
Autores: MA,YUPING; SUN,SIWEN; HAO,HUI; XU,CHUNPING.
ABSTRACT A soil isolate, Penicillium janthinellum sw09 has been found to produce significant amounts of an extracellular pectinase subsequently characterized as exo-polygalacturonase (exo-PG). By optimizing growth conditions, P. janthinellum sw09 produced high amount of exo-PG (16.54 units/mL). The crude enzyme was purified by gel filtration chromatography and two exo-PG activity peaks (designated as PGI and PGII) were revealed. On SDS-PAGE analysis, purified PGII using DEAE-Sepharose FF column, was found to be a single band with a molecular mass of 66.2 kDa. The purified PGII exhibited maximal activity at the temperature of 45 oC and pH 5.0. The stability profiles show that PGII is more stable in the pH range of 4.0-8.0 and below 60 oC. The Km and Vmax...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Penicillium janthinellum; Polygalacturonase; Purification; Characterization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200479

Natural Products: Perspectives and Challenges for use of Brazilian Plant Species in the Bioeconomy
Provedor de dados: 42
Autores: VALLI,MARILIA; BOLZANI,VANDERLAN S.
Abstract: The development of our society has been based on the use of biodiversity, especially for nutrition, medicines and beauty. Brazil is the nation with the largest biodiversity in the world, with a rich chemical diversity, which is a potential source for bioeconomy. Considering the chemical and biological diversity of the Brazilian territory, we would like to highlight the value of secondary metabolites from Brazilian biodiversity with potential application for new products and technologies and the importance of scientific programs to support the sustainable use of biodiversity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian biodiversity; Natural products; Database; Medicinal chemistry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600402

Population dynamics of  Rimapenaeus constrictus (Stimpson, 1874) (Penaeoidea) on the southeastern Brazilian coast: implications for shrimp fishing management from a 5-year study on a bycatch species
Provedor de dados: 42
Autores: LOPES,ANA ELISA B.; GRABOWSKI,RAPHAEL C.; GARCIA,JOYCE R.; FRANSOZO,ADILSON; COSTA,ROGÉRIO C. DA; HIROKI,KÁTIA A.N.; CASTILHO,ANTONIO L.
ABSTRACT This is the first study to evaluate in broad spatiotemporal scales the growth parameters and population structure of Rimapenaeus constrictus, a barely damaged species composing the bycatch from shrimp fishing in the Western Atlantic. The abundance and size-class frequency distribution, growth, longevity and sex ratio were evaluated from monthly samples obtained in the northern littoral of São Paulo state from Jan/1998 to Jun/2003. We measured 5,812 individuals in which the sex ratio was skewed toward females; this was more evident in size classes greater than 10 mm in CL (carapace length) (binomial test, p&lt;0.05). We selected 16 growth cohorts of females, and 8 of males, the majority consisting of younger individual cohorts excluded from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fisheries biology; Latitudinal variation; Recruitment cohorts; Roughneck shrimp; Stock conservation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301013

First record of Fanniidae (Diptera) from New Caledonia
Provedor de dados: 42
Autores: COURI,MÁRCIA S.; SOUSA,VIVIANE R.
Abstract: The family Fanniidae is newly recorded to New Caledonia. Adult male and female of Fannia capitalis Pont are illustrated as well as the peculiar male terminalia, the female ovipositor, and the egg. Male phallic process and egg are described for the first time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Fannia morphology; New record; Terminalia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500613

Croton argenteus preparation inhibits initial growth, mitochondrial respiration and increase the oxidative stress from Senna occidentalis seedlings
Provedor de dados: 42
Autores: RECH,KATLIN S.; SILVA,CRISTIANE B.; KULIK,JULIANA D.; DIAS,JOSIANE F.G.; ZANIN,SANDRA M.W.; KERBER,VITOR A.; OCAMPOS,FERNANDA M.M.; DALARMI,LUCIANE; SANTOS,GEDIR O.; SIMIONATTO,EUCLÉSIO; LIMA,CRISTINA P.; MIGUEL,OBDÚLIO G.; MIGUEL,MARILIS D.
Senna ocidentalis is a weed, native to Brazil, considered to infest crops and plantations, and is responsible for yield losses of several crops, particularly soybean. The aim of this work was to evaluate if theCroton argenteus extract and fractions possess phytotoxic activity on S. ocidentalis. The crude ethanolic extract (CEE) and its hexanic (HF), chloroformic (CLF) and ethyl acetate (EAF) fractions were tested in germination, growth, oxidative stress increase, Adenosine triphosphate, L-malate and succinate synthesis. The crude extract and its fractions slowed down the germination of S. ocidentalis and decreased the final percentage of germination. Oxidative stress was also increased in the seedlings, by an increase of catalase, peroxidase, superoxide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alelochemicals; Fedegoso; Velame branco; ATP synthesis; Antioxidant defense.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200753

Morphology and sedimentology of the Itaipú Embayment - Niterói/RJ
Provedor de dados: 42
Autores: SALVADOR,MARCUS VINICIUS S.; SILVA,MARIA AUGUSTA M. DA.
Bathymetric and sedimentological data from water depths between 3 and 28 meters are the basis of a detailed bathymetric map of the Itaipú Embayment and an understanding of its sedimentary dynamics. Shallower than 16 meters the contours are parallel to the shoreline whereas the morphology of the deeper bottom is influenced by the Menina, Mãe, and Pai islands. Medium sand is prevalent, with local variations in more protected or less protected areas. Minor amount of black mud possibly derives from the Itaipú Lagoon. Siliciclastic granules and pebbles may be relict. The Itaipú Embayment’s bottom morphology is controlled by stormy waves and the calmer easternmost part of the embayment presents a tendency to accumulate finer sediments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal dynamics; Coastal sedimentation; Geomorphology; Quaternary.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100009

Effects of maternal artificial vocalization on hyperprolific lactating sows and piglets behavior
Provedor de dados: 42
Autores: MOREIRA,RENNAN H.R.; OLIVEIRA,RODRIGO F. DE; PALENCIA,JORGE Y.P.; LEMES,MARINA A.G.; SILVA,MARILANE D.; GARBOSSA,CESAR A.P.; ABREU,MÁRVIO L.T. DE; MOURA,GISELLE B. DE; FERREIRA,RONY A.
Abstract The objective of this trial was to evaluate the behavioral patterns and performance of lactating sows and their litters under the effect of artificial vocalization. Twenty-eight sows and their litters were distributed in a completely randomized design in a 2x2 factorial scheme (artificial vocalization x lactation week). The behavior of the animals was monitored during 24 hours on the 7th and 15th days of lactation, analyzing the number, interval, and frequency of nursings. The body condition and performance of the sows were also evaluated. Artificial vocalization promoted higher frequencies of eating for sow and nursing for piglets (P &lt;0.05), increased inactive sow behavior (P &lt;0.05), and reduced sow alert in activity (P &lt;0.05). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior suckling; Piglet; Swine production; Sow grunting; Nursing; Vocal communication.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703675

The Generalized Odd Lindley-G Family: Properties and Applications
Provedor de dados: 42
Autores: AFIFY,AHMED Z.; CORDEIRO,GAUSS M.; MAED,MOHAMED E.; ALIZADEH,MORAD; AL-MOFLEH,HAZEM; NOFAL,ZOHDY M.
Abstract: We introduce a new class of continuous distributions called the generalized odd Lindley-G family. Four special models of the new family are provided. Some explicit expressions for the quantile and generating functions, ordinary and incomplete moments, order statistics and Rényi and Shannon entropies are derived. The maximum likelihood method is used for estimating the model parameters. The flexibility of the generated family is illustrated by means of two applications to real data sets.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Generating function; Lindley distribution; Maximum likelihood; Order statistic; T-X family.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500201

The rare genus Leptofoenus Smith, 1862 (Hymenoptera: Pteromalidae, Leptofoeninae): new records, and aspects of its distribution
Provedor de dados: 42
Autores: FERNANDES,DANIELL R.R.; KAWADA,RICARDO; TAVARES,MARCELO T.
Abstract: Despite being the largest and most remarkable species of Chalcidoidea, species of Leptofoeninae are very rarely collected. Here, we expand the distribution range extension of the Leptofoenus howardi (Ashmead, 1895) for Rondônia and Minas Gerais, Leptofoenus stephanoides (Roman, 1920) for Rondônia, Espírito Santo and São Paulo and Leptofoenus westwoodi (Ashmead, 1895) for Roraima, Amazonas, Rondônia, Bahia, Minas Gerais, Rio de Janeiro and Rio Grande do Sul.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon rainforest; Atlantic rainforest; Biology; Brazilian savanna; Brazilian dry forest; Neotropical region.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500614

Long-wavelength sensitive opsin (LWS) gene variability in Neotropical cichlids (Teleostei: Cichlidae)
Provedor de dados: 42
Autores: FABRIN,THOMAZ M.C.; PRIOLI,SONIA MARIA A.P.; PRIOLI,ALBERTO JOSÉ.
ABSTRACT Cichlid fishes are an important group in evolutionary biology due to their fast speciation. This group depends widely of vision for feeding and reproduction. During the evolutionary process it plays a significant role in interspecific and intraspecific recognition and in its ecology. The molecular basis of vision is formed by the interaction of the protein opsin and retinal chromophore. Long-wavelength sensitive opsin (LWS) gene is the most variable among the opsin genes and it has an ecological significance. Current assay identifies interspecific variation of Neotropical cichlids that would modify the spectral properties of the LWS opsin protein and codons selected. Neotropical species present more variable sites for LWS gene than those of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Convergence; Ecology; Evolution; Visual system.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100213

Enhancement of Hevea brasiliensis properties through chemical application
Provedor de dados: 42
Autores: KADIR,ROSZAINI; JANTAN,MOHD D.
ABSTRACT The effects of four different types of bleaching agents (hydrogen peroxide, sodium hypochlorite, sodium chlorite and oxalic acid) mixed together with 2% boron-based preservative (Celbor SP) were studied on green sawn rubberwood. Two concentration levels (1% and 2%) of were used. Whitish values (W) and colour changes (ΔE) of sawn rubberwood were assessed before and after chemical treatment using a colour meter. Preliminary observation indicated that timber treated with 1% and 2% hydrogen peroxide produced better and more homogeneous colour properties. Hydrogen peroxide treated timber gave higher whitish values (6.23 and 9.91 for 1% and 2% solution, respectively) and lower colour changes (8.49 and 5.51 for 1% and 2% solution, respectively) when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Bleaching agents; Physical; Mechanical; Biological properties.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602081

H-index in the Brazilian Academy of Sciences: comments and concerns
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Ponciano,Luiza C.M.O.
Bibliometric parameters have been used in order to evaluate a scientist's performance. The h-index has been gradually accepted as the most adequate parameter for this purpose. To have an idea of this index among Brazilian scientists, we performed an analysis of this parameter for the full members of the Brazilian Academy of Sciences (BAS). The h-index of 402 members listed in 10 distinct categories by the BAS was determined, cross-checked with the curriculum vitae of each of them listed at the Plataforma Lattes database (CVL) and compared with each other. Despite the large production, mostly in journals without impact factor, the h-indexes among the BAS members are comparatively low and show a large variation in all of the 10 categories, particularly in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scientometrics; Bibliometric indexes; H-index; Brazilian Academy of Sciences.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400016

U-Pb data for granulites of the Anápolis-Itauçu complex: evidence for two high-grade events in the Brasília belt
Provedor de dados: 42
Autores: Pimentel,Márcio M.; Fischel,Danielle P.; Fuck,Reinhardt A.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400024

Gap junctions in hematopoietic stroma control proliferation and differentiation of blood cell precursors
Provedor de dados: 42
Autores: Bodi,Estevão; Hurtado,Sandra P.; Carvalho,Marcelo A.; Borojevic,Radovan; Carvalho,Antônio C. Campos de.
We examined gap junction communication in an in vitro model of hematopoiesis, using the murine bone marrow stroma cell line S-17, and primary cultures of murine marrow-derived blood cell precursors. S-17 cells express several connexins, the major one being connexin 43. Connexin expression and formation of functional gap junctions is modulated by stroma cell density. Transfection of S-17 cells with a vector containing connexin 43 sense or anti-sense sequences increased or decreased, respectively, connexin 43 synthesis and intercellular dye coupling. Under these conditions, modulation of gap junction-mediated communication modified the growth pattern of stroma itself, as well as the ability of the stroma to sustain hematopoiesis. Increased connexin 43...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone marrow; Hematopoiesis; Connexins; Gap junctions; S-17 cells.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400009

Impact of continuous flow chemistry in the synthesis of natural products and active pharmaceutical ingredients
Provedor de dados: 42
Autores: SOUZA,JULIANA M. DE; GALAVERNA,RENAN; SOUZA,ALINE A.N. DE; BROCKSOM,TIMOTHY J.; PASTRE,JULIO C.; SOUZA,RODRIGO O.M.A. DE; OLIVEIRA,KLEBER T. DE.
ABSTRACT We present a comprehensive review of the advent and impact of continuous flow chemistry with regard to the synthesis of natural products and drugs, important pharmaceutical products and definitely responsible for a revolution in modern healthcare. We detail the beginnings of modern drugs and the large scale batch mode of production, both chemical and microbiological. The introduction of modern continuous flow chemistry is then presented, both as a technological tool for enabling organic chemistry, and as a fundamental research endeavor. This part details the syntheses of bioactive natural products and commercial drugs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continuous flow; Natural products; APIs; Synthesis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301131

Application of automated bioacoustic identification in environmental education and assessment
Provedor de dados: 42
Autores: Oba,Teruyo.
Developments in electronics and computer science have led to the introduction of an automated bioacoustic identification device used to resolve commonly encountered problems in the identification of animal species in the field. This technology aids our auditory observations, and also improves the quality of biological surveys and environmental monitoring. In this paper the future roles and possibilities of bioacoustics are discussed, providing some examples from the realm of environmental education and monitoring that focus on the use of nature sounds.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Automated species identification; Bioacoustics; Environmental education; Monitoring environment; Sound map.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200039

Stratigraphic Relations of the Ipubi Formation: Siliciclastic-Evaporitic Succession of the Araripe Basin
Provedor de dados: 42
Autores: FABIN,CARLOS E.; CORREIA FILHO,OSVALDO J.; ALENCAR,MÁRCIO L.; BARBOSA,JOSÉ A.; MIRANDA,TIAGO S. DE; NEUMANN,VIRGÍNIO H.; GOMES,IGOR F.; SANTANA,FELIPE R. DE.
ABSTRACT The Ipubi Formation represents the Aptian-Albian siliciclastic-evaporitic succession of Araripe Basin, NE Brazil. This succession comprises siliciclastic rocks (bituminous shales and claystones) and evaporites (gypsum and secondary anhydrite) and represents part of the lacustrine-shallow marine post-rift phase I. This study used sequence stratigraphy concepts to define the relations between changes in the relative lake level and the formation of Ipubi deposits. Results show that the organic-rich shales of the Ipubi Formation formed during a transgressive pulse that covered large areas of the proximal domains. These deposits overlie a regional unconformity that marks the end of the deposition of the underlying Crato Formation. A High Stand stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araripe Basin; Evaporite succession; Interior basins; Ipubi Formation; Sequence stratigraphy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502049

Relationship between testicular lesion and hormone levels in male rats infected with Trypanosoma evansi
Provedor de dados: 42
Autores: FACCIO,LUCIANA; SILVA,ALEKSANDRO S. DA; TONIN,ALEXANDRE A.; OBERHERR,LUCAS; GRESSLER,LUCAS T.; OLIVEIRA,CAMILA B.; OLIVEIRA,DIONATAN T.; SANGOI,MANUELA B.; MORESCO,RAFAEL N.; SAMARA,YASMIN N.; VEIGA,MARCELO; DUARTE,MARTA M.M.F.; MONTEIRO,SILVIA G.
The aim of this study was to evaluate the relationship between testicular lesions and hormone levels in rats experimentally infected with Trypanosoma evansi. For that, the measurement of reproductive hormones, histopathology and biomarkers of cellular injury were carried out in twenty-four animals, which were divided into two groups with 12 animals each. Group A was the negative control, or uninfected, while group B was composed by animals infected with T. evansi. Both groups were divided again into two other subgroups (n=6), from which serum and testicular fragments were collected on days 5 (A1 and B1) and 15 (A2 and B2) post-infection (PI). The morphological analysis showed increased alterations of head and tail of sperm in infected rats when compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protozoa; Wistar rats; Testicular lesion; Reproduction; Oxidative stress.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301537

On the patterns of principal curvature lines around a curve of umbilic points
Provedor de dados: 42
Autores: Garcia,Ronaldo; Sotomayor,Jorge.
In this paper is studied the behavior of principal curvature lines near a curve of umbilic points of a smooth surface.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Umbilic point; Principal curvature lines; Principal cycles.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100002

Chemical diversity of the volatiles of Lippia rotundifolia Cham. (Verbenaceae) in Minas Gerais, Brazil
Provedor de dados: 42
Autores: MEIRA,MESSULAN R.; MARTINS,ERNANE R.; FONSECA,FRANCINE S.A. DA.
Lippia rotundifolia is an aromatic species, native and endemic to rocky fields, which are isolated by small mountains. It is little known about their chemical composition. Because of that we aimed to study the chemical diversity of volatiles released from rosemary leaves (Lippia rotundifolia Cham.) coming from 11 populations of the Minas Gerais, Brazil. The material for chemical analysis was obtained from the accessions in the active germplasm bank of the Instituto de Ciências agrárias of the Universidade Federal de Minas Gerais. A total of 67 compounds were detected by HS-CG-MS. Most volatiles were detected in the São Gonçalo do Rio das Pedras accession, with 40 compounds, whereas in the Santana do Riacho accession only 5 compounds were detected....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical variability; Medicinal plant; Rosemary; Static headspace.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100618

Commemorative Volume of the Centenary of the Brazilian Academy of Sciences
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200371

Post-fire recovery of a dense ombrophylous forest in Amazon
Provedor de dados: 42
Autores: ANDRADE,DÁRLISON F.C. DE; GAMA,JOÃO R.V.; RUSCHEL,ADEMIR R.; MELO,LIA O.; AVILA,ANGELA L. DE; CARVALHO,JOÃO O.P. DE.
Abstract: The fires that occur in the Amazon are as damaging as the deforestation is. There is a need for further long-term studies on dynamics of tree communities in forests affected by fires. In the present study we evaluated the dynamics of tree species, before and after an accidental fire that occurred in 1997 in an experimental area of terra firme forest in the Floresta Nacional do Tapajós, in western Pará State, Brazil. Approximately 3500 trees with diameter measured at 1.30 m above ground (DBH) ≥ 5 cm were botanically identified and measured in 12 permanent plots of 0.25 ha (50 m x 50 m), in 1983, 1987, 1989, 1995, 2008 and 2012. Analyses of survival, mortality and recruitment of trees were performed. The results showed that although the fire has...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primary forest; Tree mortality; Post-fire dynamics; Tree recruitment; Resilience.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300855

Compact and user-friendly ultrasound acquisition systems optimized for field recording
Provedor de dados: 42
Autores: Specht,Raimund.
A compact and rugged hardware interface for laptop-based ultrasound recording in the field has been developed. The versatile devices overcome the limitations and drawbacks of previously available solutions. The accompanying recording software enables flexible hard disk recording for both manual and automated operation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrasound recording; Laptop-based sound recording; Long-term acoustic monitoring; Sound analysis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200040

Erratum to "Watery and dark axons in Wallerian degeneration of the opossum's optic nerve: different patterns of cytoskeletal breakdown?" [An Acad Bras Cienc 73(2001): 231-243]
Provedor de dados: 42
Autores: NARCISO,MARCELO S.; HOKOÇ,JAN NORA; MARTINEZ,ANA M. B.
Tipo: Info:eu-repo/semantics/report
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400010

Science and education on the 75th anniversary of Escola Paulista de Medicina, Universidade Federal de São Paulo
Provedor de dados: 42
Autores: Nader,Helena B.
Tipo: Info:eu-repo/semantics/article
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300001

Air quality biomonitoring of trace elements in the metropolitan area of Huancayo, Peru using transplanted Tillandsia capillaris as a biomonitor
Provedor de dados: 42
Autores: CRUZ,ALEX RUBEN H. DE LA; AYUQUE,RODOLFO FRANKLIN O.; CRUZ,RONY WILLIAM H. DE LA; LÓPEZ-GONZALES,JAVIER L.; GIODA,ADRIANA.
Abstract  The air quality and distribution of trace elements in a metropolitan area of the Peruvian Andes were evaluated using transplanted epiphytic Tillandsia capillaris as biomonitors. Biomonitors were collected from the non-contaminated area and exposed to five sites with different types of contamination for three months in 2017. After exposure, the content of twenty-one elements were determined by ICP-MS analysis. Datasets were evaluated by one-way ANOVA, exposed-to-baseline (EB), hierarchical cluster analysis (HCA) and principal component analysis (PCA). Results showed significant differences among sampling sites for several elements. According to EF ratios for Ba, Cr, Cu, Pb, Sb, and Zn EB ratios value greater than 1.75 were found around urban...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Active biomonitoring; Bioaccumulation; Airborne trace elements; Peruvian Andes; Tillandsia capillaris.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100501

Improvement of friable callus production of Boerhaavia paniculata Rich and the investigation of its lipid profile by GC/MS
Provedor de dados: 42
Autores: SOUZA,JOANNE M.M.; BERKOV,STRAHILL; SANTOS,ALBERDAN S.
In this study, a protocol to induce high amount of friable callus of Boerhaavia paniculata RICH and a lipidomics technique were applied to investigate the profile of lipids to relate to those present in the roots of this plant that presented anti-inflammatory activity in the crude hexane extract. The callus culture was induced from seeds in solidified Murashige and Skoog medium containing different amounts of glucose and different concentrations of 2,4-Dichlorophenoxyacetic acid. The explants were kept in a germination chamber at 30±2°C with a photoperiod of 16 h under light intensity of 27 µmol m–2 s–1 for 4 weeks. The best results for friable callus formation and development of the biomass were obtained in the treatment containing 2.26 µM 2.4-D and...
Palavras-chave: Anti-inflammatory lipids; Boerhaavia paniculata; Callus culture; Lipid profile; Medicinal plant.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301015

Effect of leaf essential oil from Piper solmsianum C.DC. in mice behaviour
Provedor de dados: 42
Autores: MOREIRA,DAVYSON L.; SOUZA,PATRÍCIA O.; KAPLAN,MARIA AUXILIADORA C.; PEREIRA,NUNO A.; CARDOSO,GERALDO L.; GUIMARÃES,ELSIE F.
The essential oil from Piper solmsianum leaves and its major compound (sarisan) were tested to verify their influences upon mice behaviour. The essential oil was obtained by hydrodistillation in a modified Clevenger extractor and analysed by GC/ MS. This analysis revealed in the oil the presence of monoterpenes, sesquiterpenes and of arylpropanoids. The compound sarisan, a myristicin analogue, was isolated from the oil to perform the pharmacological tests. Emulsions of the oil and of sarisan (5.0 and 10.0% v/v) were used in the tests. Pentobarbital (30 mg/ kg s.c.) or diazepam (2.5 mg/ kg s.c.) were tested as standard drugs to verify depressant or anxiolytic effects, respectively. Both essential oil and sarisan showed to have exciting and depressant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piperaceae; Piper solmsianum; Essential oil; Sarisan; Psychopharmacologic effect.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100004

Fermentation characteristics in stirred-tank reactor of exopolysaccharides with hypolipidemic activity produced by Pleurotus geesteranus5#
Provedor de dados: 42
Autores: DUOBIN,MAO; YUPING,MA; LUJING,GENG; AIJING,ZHAO; JIANQIANG,ZHENG; CHUNPING,XU.
In this study, the hypolipidemic effect of exopolysaccharides (EPS) fromPleurotus geesteranus 5# fermenting liquor by the optimal culture conditions in a 5-L stirred-tank reactor was investigated. The hypolipidemic effect of the polysaccharide, investigated in streptozotocin induced diabetic mice, decreased plasma glucose, total cholesterol and triacylglycerol concentrations by 17.1 %, 18.8 % and 12.0 %, respectively. The results of the present investigation strongly demonstrate the potential of this polysaccharide to prevent hyperglycemia in the experimental animals. Under optimal culture conditions, the maximum concentrations of mycelial and EPS were 22.63 g/L after 7 d cultivation and 11.09 g/L after 10 d, respectively. Furthermore, the morphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exopolysaccharides; Pleurotus geesteranus; Fermentation; Hypolipidemic effect; Morphology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401473

Use of performance indicators to assess the solid waste management of health services
Provedor de dados: 42
Autores: ASSIS,MAYARA C.; GOMES,VANIELLE A.P.; BALISTA,WAGNER C.; FREITAS,RODRIGO R. DE.
ABSTRACT Modern society faces serious challenges, among them, the complexity of environmental problems. Thus, there are several possible sources of environmental degradation, however, the waste produced by health services have an important peculiarity due to its toxic or pathogenic characteristics, since when managed improperly provide also health risk public. The involvement of solid waste from healthcare services environmental impact integrates matters a little more complex, because in addition to environmental health, they also interfere with the healthiness of environments that generate, with the consequences of nosocomial infections, occupational health and public. Thus, the management has become an urgent need, especially when we see no use of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Performance indicators; SWOT Matrix; AHP; Waste.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502445

Exploring biochemical diversity in bacteria
Provedor de dados: 42
Autores: WEISSENBACH,JEAN.
Abstract Abstract: The various descriptors of biochemical diversity and an evaluation of its status of knowledge are briefly outlined. Using a few examples from in house research projects, I illustrate strategies used to increase this knowledge. Because bacteria represent an extremely diverse domain of life and carry out the widest known range of biochemical transformations, this mini-review focusses on bacteria.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial metabolism; Biochemical function; Enzyme discovery; Genome annotation; Bioremediation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600605

Cell swelling and ion redistribution assessed with intrinsic optical signals
Provedor de dados: 42
Autores: WITTE,OTTO W.; NIERMANN,HEIKE; HOLTHOFF,KNUT.
Cell volume changes are associated with alterations of intrinsic optical signals (IOS). In submerged brain slices in vitro, afferent stimulation induces an increase in light transmission. As assessed by measurement of the largely membrane impermeant ion tetramethylammonium (TMA) in the extracellular space, these IOS correlate with the extent and time course of the change of the extracellular space size. They have a high signal to noise ratio and allow measurements of IOS changes in the order of a few percent. Under conditions of reduced net KCl uptake (low Cl solution) a directed spatial buffer mechanism (K syphoning) can be demonstrated in the neocortex with widening of the extracellular space in superficial layers associated with a reduced light...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intrinsic optic signals; Spatial buffer; Brain slice; Extracellular space volume; Spreading depression.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300005

Genetic parameters, path analysis and indirect selection of agronomic traits of cassava germplasm
Provedor de dados: 42
Autores: DINIZ,RAFAEL P.; OLIVEIRA,EDER J. DE.
Abstract: This study aimed to estimate genetic parameters and correlations between morphological, agronomic and root quality traits of cassava plants, as well as to study cause and effect relationships through path analysis. A total of 814 genotypes were evaluated from 2011 to 2015. The joint analysis of the data was performed by the mixed models approach. The predicted genetic values of the genotypes were used to estimate the genetic correlations among as well the path analysis. The estimates of heritability of the genotype means ranged from 0.31 (commercial fresh root yield – CRY) to 0.62 (plant height - PLH). The highest genetic correlation coefficient estimates were observed for starch yield (STY) × total fresh root yield (FRY) (0.97). The results of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Heritability; Correlation; Correlated response.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500859

Anatomical modifications of Butia capitata propagated under colored shade nets
Provedor de dados: 42
Autores: COSTA,BÁRBARA N.S.; COSTA,IRTON J.S.; SOUZA,GENAINA A. DE; SANTOS,DALILHIA N. DOS; SILVEIRA,FLÁVIA A. DA; MELO,EVALDO T. DE; MARTINS,ADALVAN D.; PASQUAL,MOACIR; SETOTAW,TESFAHUN A.; RODRIGUES,FILIPE A.
Abstract The jelly palm plant [Butia capitata (Martius) Beccari] is a native palm of the Cerrado biome used for many purposes in northern Minas Gerais State, Brazil. Dormancy is common in palm seeds, resulting in slow and uneven germination that may take years to complete. Modification in the growth pattern, anatomical parameters, physiological and biochemical characteristics of the plant can be verified due to changes in the light spectrum transmitted through colored shade nets used. Therefore, the objective of this study is to evaluate the effect of colored shade nets on the leaf and root anatomy of the jelly palm plant. The experiment was performed in a completely randomized design, with five treatments, ten replicates and eight plants per replicate,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Environment; Palms; Propagation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703615

Chemical constituents of Simarouba versicolor
Provedor de dados: 42
Autores: ARRIAGA,ANGELA M.C.; MESQUITA,ALDENOR C. DE; POULIQUEN,YVONE B.M.; LIMA,ROBERTO A. DE; CAVALCANTE,SERGIO H.; CARVALHO,MARIO G. DE; SIQUEIRA,JOSÉ A. DE; ALEGRIO,LEILA V.; BRAZ-FILHO,RAIMUNDO.
From the roots, stems and fruits of Simarouba versicolor (Simaroubaceae) were isolated quassinoids (3, 5-7), triterpenoids (8-14), a mixture of steroids (15-17), the flavonoid kaempferol (18) and the squalene derivative 11,14-diacetoxy-7,10; 15,18-diepoxy-6,19-dihidroxy-6,7,10,11,14,15,18,19-octahydrosqualene (19). Spectral data were used for structural characterization.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Simarouba versicolor; Simaroubaceae; Quassinoids; Triterpenoids; Steroids; Flavonoid; Squalene derivative.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300004

Mitochondrial DNA damage associated with lipid peroxidation of the mitochondrial membrane induced by Fe2+-citrate
Provedor de dados: 42
Autores: Almeida,Andréa M.; Bertoncini,Clélia R.A.; Borecký,Jiri; Souza-Pinto,Nadja C.; Vercesi,Aníbal E.
Iron imbalance/accumulation has been implicated in oxidative injury associated with many degenerative diseases such as hereditary hemochromatosis, beta-thalassemia, and Friedreich's ataxia. Mitochondria are particularly sensitive to iron-induced oxidative stress - high loads of iron cause extensive lipid peroxidation and membrane permeabilization in isolated mitochondria. Here we detected and characterized mitochondrial DNA damage in isolated rat liver mitochondria exposed to a Fe2+-citrate complex, a small molecular weight complex. Intense DNA fragmentation was induced after the incubation of mitochondria with the iron complex. The detection of 3' phosphoglycolate ends at the mtDNA strand breaks by a 32P-postlabeling assay, suggested the involvement of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Lipid peroxidation; Mitochondria; MtDNA; Oxidative stress.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300010

On the occurrence and ecology of Glaucus atlanticus Forster, 1777 (Mollusca: Nudibranchia) along the Southwestern Atlantic coast
Provedor de dados: 42
Autores: PINOTTI,RAPHAEL M.; BOM,FABIO C.; MUXAGATA,ERIK.
Abstract: Unlike the majority of the nudibranchs, Glaucidae lives adrift at the sea surface within Tropical and Subtropical ocean basins, feeding on cnidarians or using them to attach their egg strings as a reproductive strategy. The latitudinal distribution of Glaucus atlanticus throughout the Brazilian Province is influenced by the Brazil current and, in its austral limit, by seasonal shifts in the Subtropical Convergence Zone (especially under the influence of ENSO El Niño events). Once over the shelf, seasonal wind patterns and meteorological events can force a passive displacement of the species towards the shore. Such onshore displacements may result on strandings of Glaucus spp. and other pleustonic species of the “blue plankton” community, like...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeography; Cnidarians; Holoplankton; Nudibranch; Strandings.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100631

Phenological characterization and temperature requirements of Annona squamosa L. in the Brazilian semiarid region
Provedor de dados: 42
Autores: MENDES,DÉBORA S.; PEREIRA,MARLON C.T.; NIETSCHE,SILVIA; SILVA,JOSEILTON F.; ROCHA,JOSIELE S.; MENDES,ATHOS H.; XAVIER,HELISSON R.A.; SANTOS,RAYANE C. DOS.
ABSTRACT  The phenological growth stages of various species of monocotyledonous and dicotyledonous plants can be uniformly coded using the Biologische Bundesanstalt, Bundessortenamt, und Chemische Industrie (BBCH) scale. The aim of the present study was to determine the duration of different phenological stages and the temperature requirements of the sugar-apple, Annona squamosa, during two crop cycles in the semiarid region of Brazil. Phenological stages were divided into eight of ten possible principal stages: (0) bud development, (1) leaf development, (3) shoot/branch development, (5) inflorescence emergence, (6) flowering, (7) fruit development, (8) fruit maturity and (9) senescence and the beginning of dormancy. The phenological cycle of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BBCH; Sugar-apple; Degree days; Phenology; Pruning timing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502293

Population dynamics and reproductive phenology of a harvestman in a tidal freshwater wetland
Provedor de dados: 42
Autores: IGLESIAS,PATRICIA P.; PEREYRA,MARTÍN O.
Abstract  There is a great amount of ecological information for terrestrial arthropods in several types of habitats, but few studies have focused on populations living in tidal freshwater wetlands. During a two-year field survey, we studied the temporal dynamics of the harvestman Discocyrtus prospicuus inhabiting a freshwater wetland exposed to predictable tides and unpredictable floods. We also explored the effects of temperature, precipitation, and tide level on the population dynamics and reproductive phenology. Our findings are markedly different from those reported in other harvestman species living in different habitats and also from conspecific populations living in the mainland. Adults, subadults, and juveniles remain active throughout the year,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic factors; Breeding season; Phenology; Sex-ratio; Unpredictable floods.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100710

Atheroprotective action of a modified organoselenium compound:  in vitro evidence
Provedor de dados: 42
Autores: OLIVEIRA,JADE DE; STRALIOTTO,MARCOS R.; MANCINI,GIANNI; FIGUEIREDO,CLAUDIA P.; BRAGA,ANTÔNIO L.; TEIXEIRA,JOÃO B.R.; BEM,ANDREZA F.
ABSTRACT Oxidation of low-density lipoprotein (LDL) has been strongly suggested to play a significant role in the pathogenesis of atherosclerosis. Thus, reducing LDL oxidation is a potential approach to decrease the risk of the atherosclerosis. Organoselenium compounds have demonstrated promising atheroprotective properties in experimental models. Herein, we tested the in vitro atheroprotective capability of a modified organoselenium compound, Compound HBD, in protecting isolated LDL from oxidation as well as foam cells formation. Moreover, the glutathione peroxidase (GPx)-like activity of Compound HBD was analyzed in order to explore the mechanisms related to the above-mentioned protective effects. The Compound HBD in a concentration-dependent manner...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atherosclerosis; Compound HBD; Foam cell; GPx-like activity; LDL oxidation; Organoselenium compounds.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501953

Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria
Provedor de dados: 42
Autores: Lins,Ulysses; McCartney,Martha R.; Farina,Marcos; Frankel,Richard B.; Buseck,Peter R.
We report on the application of off-axis electron holography and high-resolution TEM to study the crystal habits of magnetosomes and magnetic microstructure in two coccoid morphotypes of magnetotactic bacteria collected from a brackish lagoon at Itaipu, Brazil. Itaipu-1, the larger coccoid organism, contains two separated chains of unusually large magnetosomes; the magnetosome crystals have roughly square projections, lengths up to 250 nm and are slightly elongated along [111] (width/length ratio of about 0.9). Itaipu-3 magnetosome crystals have lengths up to 120 nm, greater elongation along [111] (width/length ~0.6), and prominent corner facets. The results show that Itaipu-1 and Itaipu-3 magnetosome crystal habits are related, differing only in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnetite; Magnetotaxis; High-resolution transmission electron microscopy.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300007

The neural crest stem cells: control of neural crest cell fate and plasticity by endothelin-3
Provedor de dados: 42
Autores: DUPIN,ELISABETH; REAL,CARLA; LeDOUARIN,NICOLE.
How the considerable diversity of neural crest (NC)-derived cell types arises in the vertebrate embryo has long been a key question in developmental biology. The pluripotency and plasticity of differentiation of the NC cell population has been fully documented and it is well-established that environmental cues play an important role in patterning the NC derivatives throughout the body. Over the past decade, in vivo and in vitro cellular approaches have unravelled the differentiation potentialities of single NC cells and led to the discovery of NC stem cells. Although it is clear that the final fate of individual cells is in agreement with their final position within the embryo, it has to be stressed that the NC cells that reach target sites are pluripotent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neural crest; Avian embryo; Cell differentiation; Endothelin3; Peripheral nervous system; Melanocytes; Schwann cells; Mesectoderm.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400007

Cordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: LOPES,RENATO P.; DILLENBURG,SERGIO R.; SCHULTZ,CESAR L.
ABSTRACT Loess consists of silt-dominated sediments that cover ~10% of the Earth's surface. In southern South America it occurs in Argentina, Bolivia, Paraguay and Uruguay, and its presence in southern Brazil was never studied in detail. Here is proposed a new lithostratigraphic unit, Cordão Formation, consisting of loess deposits in the southern Brazilian coastal plain. It consists of fine-very fine silt with subordinate sand and clay, found mostly in lowland areas between Pleistocene coastal barriers. These sediments are pale-colored (10YR hue) and forms ~1,5-2,0 meter-thick stable vertical walls. The clay minerals include illite, smectite, interstratified illite/smectite and kaolinite, the coarser fraction is mostly quartz and plagioclase. Caliche and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chuy Creek; Coastal plain; Last glacial stage; Loess; Pleistocene.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602143

Correlation between voxel based morphometry and manual volumetry in magnetic resonance images of the human brain
Provedor de dados: 42
Autores: Uchida,Ricardo R.; Del-Ben,Cristina M.; Araújo,David; Busatto-Filho,Geraldo; Duran,Fábio L.S.; Crippa,José A.S.; Graeff,Frederico G.
This is a comparative study between manual volumetry (MV) and voxel based morphometry (VBM) as methods of evaluating the volume of brain structures in magnetic resonance images. The volumes of the hippocampus and the amygdala of 16 panic disorder patients and 16 healthy controls measured through MV were correlated with the volumes of gray matter estimated by optimized modulated VBM. The chosen structures are composed almost exclusively of gray matter. Using a 4 mm Gaussian filter, statistically significant clusters were found bilaterally in the hippocampus and in the right amygdala in the statistical parametric map correlating with the respective manual volume. With the conventional 12 mm filter,a significant correlation was found only for the right...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnetic resonance imaging; Manual volumetry; Voxel based morphometry.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100010

Brazilian Science and Research Integrity: Where are We? What Next?
Provedor de dados: 42
Autores: Vasconcelos,Sonia M.R.; Sorenson,Martha M.; Watanabe,Edson H.; Foguel,Debora; Palácios,Marisa.
Building a world-class scientific community requires first-class ingredients at many different levels: funding, training, management, international collaborations, creativity, ethics, and an understanding of research integrity practices. All over the world, addressing these practices has been high on the science policy agenda of major research systems. Universities have a central role in fostering a culture of research integrity, which has posed additional challenges for faculty, students and administrators - but also opportunities. In Brazil, the leading universities and governmental funding agencies are collaborating on this project, but much remains to be done.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Responsible conduct of research; Academic integrity; Science policy; Research ethics education; International collaborations; 4th World Conference on Research Integrity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201259

Vitamin B6 reduces oxidative stress in lungs and liver in experimental sepsis
Provedor de dados: 42
Autores: GIUSTINA,AMANDA D.; DANIELSKI,LUCINÉIA G.; NOVOCHADLO,MICHELE M.; GOLDIM,MARIANA P.S.; JOAQUIM,LARISSA; METZKER,KIUANNE L.L.; CARLI,RAQUEL JACONI DE; DENICOL,TAIS; CIDREIRA,THAINA; VIEIRA,THAYNAN; PETRONILHO,FABRICIA.
Abstract Abstract: Sepsis is a life-threatening organ dysfunction induced by a disrupted host response to infecting pathogens. Inflammation and oxidative stress are intrinsically related to sepsis progression and organ failure. Vitamin B6 is an important cellular cofactor for metabolic processes and has anti-inflammatory and antioxidant properties. We aimed at evaluating the effect of vit B6 on inflammation and oxidative stress markers in the liver and lung of rats subjected to a relevant animal model of polymicrobial sepsis. Adult male Wistar rats were submitted to ﻿cecal ligation and perforation model and immediately after sepsis induction, vit B6 was administered as a single dose (600 mg/kg, subcutaneous). Twenty-four hours later, the lung and liver...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sepsis; Vitamin B6; Oxidative stress; Antioxidant.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700627

Metaphylactic effect of calcium on milk composition and animal health in post-partum dairy cows
Provedor de dados: 42
Autores: ALBANI,KÁSSIO D.; LOPES,LEANDRO S.; CAMPIGOTTO,GABRIELA; BALDISSERA,MATHEUS D.; SILVA,ALEKSANDRO S. DA.
Abstract: The aim of this study was to evaluate the effects of subcutaneous calcium administration in post-partum dairy cows with respect to carbohydrate, protein and lipids metabolism, as well as its effects on milk composition. Twenty post-partum dairy cows were randomly divided into two groups (n=10): a control and a treated group with a single dose (150 mL) of calcium. Blood collection was performed on post-partum days 1, 2, 3, 7 and 10. In addition, we measured serum levels of total calcium, total proteins, albumin, globulins, glucose, cholesterol, triglycerides, as well as creatine kinase (CK) activity. We determined milk composition on post-partum days 5, 10 and 20. Serum total calcium levels was higher on post-partum days 3 and 7 in the treated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal health; Dairy cattle; Pre-delivery; Subcutaneous calcium; Hypocalcemia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300806

Chronostratigraphic dating of carbonates based on 87Sr/86Sr ratio: case studies from Brazilian sedimentary basins
Provedor de dados: 42
Autores: RODRIGUES,RENÉ.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300035

Occurrence and characterization of entomogenic galls in an area of Cerrado sensu stricto and Gallery forest of the state of Bahia, Brazil
Provedor de dados: 42
Autores: SILVA,APARECIDA RAVENE F. DA; NOGUEIRA,RAVENA M.; COSTA,ELAINE C.; CARVALHO-FERNANDES,SHEILA P.; SANTOS-SILVA,JULIANA.
Abstract We surveyed insect galls in an area of Cerrado sensu stricto and Gallery forest in the municipality of Caetité (BA) to contribute to current knowledge of the local flora and its associated gall-inducing insects. Monthly collections were made between February/2015 and January/2016, totaling 12 field campaigns (involving two or three people and lasting four hours) that followed an established path through the countryside. A total of 63 gall morphotypes were identified on 47 host plant species belonging to 22 families; 17 morphotypes were found in the Gallery forest and 46 in Cerrado vegetation. The plant families showing the greatest gall richness were Leguminosae (n=15), Myrtaceae (n=9), and Asteraceae (n=7). The species with the greatest number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cecidomyiidae; Plant-insect interactions; Leguminosae; Semiarid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602903

Morphology and morphometry of upland lakes over lateritic crust, Serra dos Carajás, southeastern Amazon region
Provedor de dados: 42
Autores: SILVA,MARCIO S. DA; GUIMARÃES,JOSÉ T.F.; SOUZA FILHO,PEDRO W.M.; NASCIMENTO JÚNIOR,WILSON; SAHOO,PRAFULLA K.; COSTA,FRANCISCO R. DA; SILVA JÚNIOR,RENATO O.; RODRIGUES,TARCÍSIO M.; COSTA,MARLENE F. DA.
ABSTRACT High-resolution satellite images, digital elevation models, bathymetric and sedimentological surveys coupled with statistical analysis were used to understand the physical environment and discuss their influence on water quality of the five upland lakes of Serra Sul dos Carajás, southeast Amazonia. The lakes have mid-altitude ranges (elevation), very small (catchment) and shallow to very shallow (central basins). Based on the length, area and volume, Violão and TI (Três Irmãs)-3 lakes may present large vertical movements of the water due to wind action and weakly stratified waters. Trophic conditions based on depth and shore development (Ld) parameters must be used with caution, since Amendoim Lake is relatively deep, but it is oligotrophic to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lateritic crust; Lakes; Limnology; Geomorphology; Amazon region; Carajás.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401309

Molecular research and the control of Chagas disease vectors
Provedor de dados: 42
Autores: Abad-Franch,Fernando; Monteiro,Fernando A.
Chagas disease control initiatives are yielding promising results. Molecular research has helped successful programs by identifying and characterizing introduced vector populations and by defining intervention targets accurately. However, researchers and health officials are facing new challenges throughout Latin America. Native vectors persistently reinfest insecticide-treated households, and sylvatic triatomines maintain disease transmission in humid forest regions (including Amazonia) without colonizing human dwellings. In these scenarios, fine-scale vector studies are essential to define epidemiological risk patterns and clarify the involvement of little-known triatomine taxa in disease transmission. These eco-epidemiological investigations, as well as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular systematics; DNA; Allozymes; Triatominae; Chagas disease.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300007

Pore-linked filaments in anura spermatocyte nuclei
Provedor de dados: 42
Autores: Beçak,Maria Luiza; Fukuda-Pizzocaro,Kazumi.
Pore-linked filaments were visualized in spreads of anuran spermatocyte nuclei using transmission electron microscope. We used Odontophrynus diplo and tetraploid species having the tetraploid frogs reduced metabolic activities. The filaments with 20-40 nm width are connected to a ring component of the nuclear pore complex with 90-120 nm and extend up to 1µm (or more) into the nucleus. The filaments are curved and connect single or neighboring pores. The intranuclear filaments are associated with chromatin fibers and related to RNP particles of 20-25 nm and spheroidal structures of 0.5µm, with variations. The aggregates of several neighboring pores with the filaments are more commonly observed in 4n nuclei. We concluded that the intranuclear filaments may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pore-linked filaments; Intranuclear filaments; Clustered-like NPCs in polyploid anurans; RNA transport.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100009

Sporothrix schenckii and sporotrichosis
Provedor de dados: 42
Autores: Lopes-Bezerra,Leila M.; Schubach,Armando; Costa,Rosane O.
For a long time sporotrichosis has been regarded to have a low incidence in Brazil; however, recent studies demonstrate that not only the number of reported cases but also the incidence of more severe or atypical clinical forms of the disease are increasing. Recent data indicate that these more severe forms occur in about 10% of patients with confirmed diagnosis. The less frequent forms, mainly osteoarticular sporotrichosis, might be associated both with patient immunodepression and zoonotic transmission of the disease. The extracutaneous form and the atypical forms are a challenge to a newly developed serological test, introduced as an auxiliary tool for the diagnosis of unusual clinical forms of sporotrichosis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sporotrichosis; Diagnosis; Epidemiology; Drugs; Cell wall; Antigens.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200009

Seismogenic faulting in the Meruoca granite, NE Brazil, consistent with a local weak fracture zone
Provedor de dados: 42
Autores: MOURA,ANA CATARINA A.; OLIVEIRA,PAULO H.S. DE; FERREIRA,JOAQUIM M.; BEZERRA,FRANCISCO H.R.; FUCK,REINHARDT A.; NASCIMENTO,ADERSON F. DO.
A sequence of earthquakes occurred in 2008 in the Meruoca granitic pluton, located in the northwestern part of the Borborema Province, NE Brazil. A seismological study defined the seismic activity occurring along the seismically-defined Riacho Fundo fault, a 081° striking, 8 km deep structure. The objective of this study was to analyze the correlation between this seismic activity and geological structures in the Meruoca granite. We carried out geological mapping in the epicentral area, analyzed the mineralogy of fault rocks, and compared the seismically-defined Riacho Fundo fault with geological data. We concluded that the seismically-defined fault coincides with ∼E–W-striking faults observed at outcrop scale and a swarm of Mesozoic basalt dikes. We...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meruoca pluton; Riacho Fundo fault; Seismological data; Transbrasiliano Lineament.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401631

GMOs: building the future on the basis of past experience
Provedor de dados: 42
Autores: Reis,Luiz F.L.; Van Sluys,Marie-Anne; Garratt,Richard C.; Pereira,Humberto M.; Teixeira,Mauro M.
Biosafety of genetically modified organisms (GMOs) and their derivatives is still a major topic in the agenda of government and societies worldwide. The aim of this review is to bring into light that data that supported the decision taken back in 1998 as an exercise to stimulate criticism from the scientific community for upcoming discussions and to avoid emotional and senseless arguments that could jeopardize future development in the field. It must be emphasized that Roundup Ready® soybean is just one example of how biotechnology can bring in significant advances for society, not only through increased productivity, but also with beneficial environmental impact, thereby allowing more rational use of agricultural pesticides for improvement of the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosafety; Genetically modified organisms; Transgene.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400005

Control of the skin scarring response
Provedor de dados: 42
Autores: Ferreira,Lydia M.; Gragnani,Alfredo; Furtado,Fabianne; Hochman,Bernardo.
There comes a time when the understanding of the cutaneous healing process becomes essential due to the need for a precocious tissue repair to reduce the physical, social, and psychological morbidity. Advances in the knowledge on the control of interaction among cells, matrix and growth factors will provide more information on the Regenerative Medicine, an emerging area of research in medical bioengineering. However, considering the dynamism and complexity of the cutaneous healing response, it is fundamental to understand the control mechanism exerted by the interaction and synergism of both systems, cutaneous nervous and central nervous, via hypothalamus hypophysis-adrenal axis, a relevant subject, but hardly ever explored. The present study reviews the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wound healing; Keratinocytes; Fibroblasts; Keloid; Tissue engineering; Skin; Plastic surgery.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300024

Cytogenetic damage related to low levels of methyl mercury contamination in the Brazilian Amazon
Provedor de dados: 42
Autores: AMORIM,MARÚCIA I. M.; MERGLER,DONNA; BAHIA,MARCELO O.; DUBEAU,HÉLÈNE; MIRANDA,DANIELA; LEBEL,JEAN; BURBANO,ROMMEL R.; LUCOTTE,MARC.
The mercury rejected in the water system, from mining operations and lixiviation of soils after deforestation, is considered to be the main contributors to the contamination of the ecosystem in the Amazon Basin. The objectives of the present study were to examine cytogenetic functions in peripheral lymphocytes within a population living on the banks of the Tapajós River with respect to methylmercury (MeHg) contamination, using hair mercury as a biological indicator of exposure. Our investigation shows a clear relation between methylmercury contamination and cytogenetic damage in lymphocytes at levels well below 50 micrograms/gram, the level at which initial clinical signs and symptoms of mercury poisoning occur. The first apparent biological effect with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Amazon; Mercury; Mitotic Index; Cytogenetics.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400004

A new qualitative proof of a result on the real jacobian conjecture
Provedor de dados: 42
Autores: BRAUN,FRANCISCO; LLIBRE,JAUME.
Let F= (f, g) : R2 → R2be a polynomial map such that det DF(x) is different from zero for all x∈ R2. We assume that the degrees of fand gare equal. We denote by the homogeneous part of higher degree of f and g, respectively. In this note we provide a proof relied on qualitative theory of differential equations of the following result: If  do not have real linear factors in common, then F is injective.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Real Jacobian conjecture; Global injectivity; Center; Poincaré compactification.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401519

A link between the hippocampal and the striatal memory systems of the brain
Provedor de dados: 42
Autores: Rossato,Janine I.; Zinn,Carolina G.; Furini,Cristiane; Bevilaqua,Lia R.M.; Medina,Jorge H.; Cammarota,Martín; Izquierdo,Iván.
Two major memory systems have been recognized over the years (Squire 1987): the declarative memory system, which is under the control of the hippocampus and related temporal lobe structures, and the procedural or habit memory system, which is under the control of the striatum and its connections. Most if not all learning tasks studied in animals, however, involve either the performance or the suppression of movement; this, if learned well, may be viewed as having become a habit. It is agreed that memory rules change from their first association to those that take place when the task is mastered. Does this change of rules involve a switch from one memory system to another? Here we will comment on: 1) reversal learning in the Morris water maze (MWM), in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hippocampus; Striatum; Declarative memory; Procedural memory; Habits; Learning.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300011

Sensitivity of understorey bird species in two different successional stages of the lowland Atlantic Forest, Brazil
Provedor de dados: 42
Autores: Loures-Ribeiro,Alan; Manhães,Marco A.; Dias,Manoel M.
The Atlantic Forest has a high destruction rate and there is little information available on some aspects of the neotropical bird biology. Changes in environment are important factors that affect the resources available to birds. We compared the species sensitivity level of understorey birds in two areas in distinct successional stages (primary and secondary sections). Two 100 ha plots of lowland Atlantic Forest were analysed between August and December 2006. Among 25 bird species recorded, thirteen had lower abundance in secondary forest, two in primary forest, and ten had not clear tendency. According to the criteria used, the percentages for species with low, and medium and high sensitivity to habitat change were 44% and 56%, respectively. The number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Neotropical birds; Point counts; South America; Tropical forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300016

Schizonyxhelea thomsenae (Wirth), description of the pupa and first records from Argentina, Brazil and Peru (Diptera: Ceratopogonidae)
Provedor de dados: 42
Autores: Cazorla,Carla G.; Díaz,Florentina.
Abstract  The pupa of Schizonyxhelea thomsenae (Wirth) is described and illustrated from material collected in Misiones province, Argentina. A key for the four known species of pupae of Schizonyxhelea is given, a diagnosis and photographs of the adult are also provided, and the geographic distribution of the species in the Neotropical region is enlarged including first records from Argentina, Brazil and Peru based mainly on adult specimens.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical region; Predaceous midges; Pupa; New records; Schizonyxhelea.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100705

Seabather's eruption: report of fourteen cases
Provedor de dados: 42
Autores: ROSSETTO,ANDRÉ LUIZ; SILVEIRA,FÁBIO LANG DA; MORANDINI,ANDRÉ CARRARA; HADDAD JUNIOR,VIDAL; RESGALLA JUNIOR,CHARRID.
Seabather's eruption is a papulo-pruritic dermatitis caused by the nematocysts of the larvae of the jellyfish Linuche unguiculata retained in the clothing fibers. Previously reported in Brazil, this work describes fourteen cases that occurred in the State of Santa Catarina, in southern Brazil. The new cases observed over a short period of time (the first half of January, 2012), at the height of the summer season, should alert health teams to possible epidemics on the coast of the state of Santa Catarina.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cnidaria; Dermatitis; Nematocysts; Public health; Southern Brazil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100431

Plant species diversity in a Neotropical wetland: patterns of similarity, effects of distance, and altitude
Provedor de dados: 42
Autores: BAO,FRANCIELLI; LEANDRO,THALES D.; ROCHA,MAÍRA DA; SANTOS,VANESSA S. DOS; STEFANELLO,THIAGO H.; ARRUDA,RAFAEL; POTT,ARNILDO; DAMASCENO-JÚNIOR,GERALDO A.
ABSTRACT The Brazilian Pantanal is an extensive wetland with heterogeneous habitats, primarily due to the river-floodplain system and plants with differential adaptations and reproductive strategies. Factors such as altitude, distance among plant formations, and flood pulse must be considered to better understand its diversity. Aiming to assess the influence of biogeographic patterns in this system, we analyzed the floristic composition of six areas along the Paraguay River, including residual relieves, verifying the pattern of similarity, and effects of distance and altitude. We recorded 356 species in 87 families, mostly perennial (75%), and some annuals (15%) and pluriannuals (5%). Herbaceous plants were the most represented (48%), followed by arboreal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeography; Floodplain; Floristics; Pantanal; Vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100085

Vitamin E and organic selenium for broilers from 22 to 42 days old: performance and carcass traits
Provedor de dados: 42
Autores: ALBUQUERQUE,DANIEL M.N.; LOPES,JOÃO B.; FERRAZ,MAÍRA S.; RIBEIRO,MABELL N.; SILVA,SANDRA R.G.; COSTA,ELVÂNIA M.S.; LIMA,DANIELA C.P.; FERREIRA,JEFFERSON D.M.; GOMES,PEDRO E.B.; LOPES,JACKELLINE C.O.
ABSTRACT This study was conducted to evaluate the effect of vitamin E and selenium on performance, viability, productive efficiency, and yields of carcass, major cuts, and organs of broilers from 22 to 42 days submitted to cyclic-heat stress. The experimental design was randomized blocks, in a 2 × 3 factorial arrangement with two levels of selenium (0.1 and 0.3 mg/kg) and three levels of vitamin E (300, 400, and 500 mg/kg), plus a control treatment. Animals were submitted to a natural condition of high cyclic temperature. Organic selenium levels of 0.1 and 0.3 mg/kg associated with 300, 400, and 500 mg/kg of vitamin E were tested. The level of vitamin E did not affect the performance or production efficiency of broilers in the period from 22 to 33 days and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Minerals; Nutrition; Poultry; Productive efficiency; Vitamins.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301259

Aqueous extract of Psidium guajava leaves: phenolic compounds and inhibitory potential on digestive enzymes
Provedor de dados: 42
Autores: SIMÃO,ANDERSON A.; MARQUES,TAMARA R.; MARCUSSI,SILVANA; CORRÊA,ANGELITA D.
ABSTRACT Leaves of Psidium guajava L. (guava) have been widely used in the popular way for prevention and treatment of various diseases. Thus, the objective of this study was to evaluate the inhibitory potential of leaves aqueous extract from three cultivars of P. guajava (Pedro Sato, Paluma and Século XXI) on α-amylase, α-glycosidase, lipase, and trypsin enzymes, in the presence or not of simulated gastric fluid and to determine the content of phenolic compounds by high performance liquid chromatography. All cultivars presented the same composition in phenolic compounds, but in different proportions. The compounds identified are gallic acid, epigallocatechin gallate, syringic acid, o-coumaric acid, resveratrol, quercetin, and catechin (which was the major...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Obesity; Α-amylase; Α-glycosidase; Lipase; Trypsin.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502155

Saline extract from Malpighia emarginata DC leaves showed higher polyphenol presence, antioxidant and antifungal activity and promoted cell proliferation in mice splenocytes.
Provedor de dados: 42
Autores: BARROS,BÁRBARA R.S.; BARBOZA,BRUNO RAFAEL; RAMOS,BÁRBARA A.; MOURA,MAIARA C. DE; COELHO,LUANA C.B.B.; NAPOLEÃO,THIAGO HENRIQUE; CORREIA,MARIA TEREZA S.; PAIVA,PATRÍCIA MARIA G.; CRUZ FILHO,IRANILDO JOSÉ DA; SILVA,TÚLIO DIEGO DA; LIMA,CLÁUDIA S.A.; MELO,CRISTIANE M.L. DE.
Abstract: Currently, the research of new natural compounds with biological potential demonstrates great ethnopharmacological importance. In this study, we evaluated the biological properties promoted by saline extract from Malpighia emarginata DC leaves, whose objective is to evaluate the antioxidant, antimicrobial and cytotoxicity potential. Phytochemical characterization was performed by UPLC-MS chromatography to identify the chemical compounds. For the antioxidant potential, DPPH, ATT and FRAP methods were used. The antibacterial and antifungal tests were performed evaluating the MIC50, MIC90, CMB and CMF parameters. Moreover, antibiofilm action was evaluated. Cytotoxicity and proliferation were performed using splenocytes from Balb/c mice and were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactive compounds; Cytotoxicity; Malpighia emarginata DC; Phytochemical.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100627

Infection by the microsporidium of Clado Nosema/Vairimorpha in pupal parasitoids
Provedor de dados: 42
Autores: PAES,JOÃO P.P.; CARVALHO,VANESSA R.; SOUZA,AMANDA R. DE; WILCKEN,CARLOS F.; BUENO,REGIANE C.O. F.
Abstract: The sugarcane borer, Diatraea saccharalis is one of the hosts more used for parasitoid pupal multiplication in Brazil. The parasitoids pupal of Trichospilus diatraeae and Palmistichus elaeisis are generalist natural enemies with potential to suppress populations of diverse families of lepidopteran pests. The success in the utilization of these natural enemies in the field is directly related to the capacity of search of the host, this capacity might be affected by the presence of the pathogens. In this context, the aim of this essay was to detect the presence of intracellular parasites of Phylum Microsporidia. These pathogens may cause morphological and behavioral alterations. The presence of infection was verified by microscopy and was confirmed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Microsporidium; Pupal parasitoids; PCR.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500857

Trichostrongylus and Haemonchus anthelmintic resistance in naturally infected sheep from southern Brazil
Provedor de dados: 42
Autores: KLAUCK,VANDERLEI; PAZINATO,RAFAEL; LOPES,LEANDRO S.; CUCCO,DIEGO C.; LIMA,HORACIO L. DE; VOLPATO,ANDREIA; RADAVELLI,WILLIAN M.; STEFANI,LENITA C.M.; SILVA,ALEKSANDRO S. DA.
The anthelmintic resistance in small ruminants is a common problem and concern worldwide. The aim of this study was to verify anthelmintic treatment efficacy in naturally infected sheep. This study was conducted on nine herds that used the same anthelmintic management for over a year. In each farm, the animals were divided into two groups: untreated control group (n = 5) and treated (n = 10) according to the number of eggs per gram of feces (EPG). The treatment effect was checked based on EPG results and larval culture performed before treatment and 10 days after treatment. Significant differences were not observed (P&gt; 0.05) on EPG results between untreated and treated groups. The coproculture showed that the animals were infected primarily byHaemonchus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthelmintic resistance; Albendazole; Closantel; Levamizol; Helminths.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200777

Influences of stocking density and dietary probiotic supplementation on growing Japanese quail performance
Provedor de dados: 42
Autores: MAHROSE,KHALID M.; ELHACK,MOHAMED E. ABD; MAHGOUB,SAMIR A.; ATTIA,FATEN A. M.
Abstract: This study investigated the effects of stocking density and dietary supplementation of probiotic (Lactobacillus) on growth, traits of carcass, lymphoid organs and intestinal microbial count of Japanese quail. Quail chicks (one week old) were randomly allotted to 6 groups in a 2×3 factorial experiment included 2 levels of stocking density (100, and 75 cm2/bird) and 3 levels of probiotic (0.00, 0.02 and 0.04 g/kg diet). Quail reared at 100 cm2/ bird showed significantly the highest body weight and daily gain. Quail reared at 75 cm2/ bird had significantly the lower average of feed consumption and the best ratio of feed conversion. Increasing level of probiotic up to 0.04 g/kg led to a significant decrease in dressing percentage by about 2.7 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stocking density; Probiotic; Growth; Immunology; Microbial count; Quail.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300603

A review of the Quaternary Scelidotheriinae (Mammalia, Xenarthra, Tardigrada) from the Tarija-Padcaya basin, Bolivia
Provedor de dados: 42
Autores: MIÑO-BOILINI,ÁNGEL R.; CARLINI,ALFREDO A.; ZURITA,ALFREDO E.; SOIBELZON,ESTEBAN; RODRÍGUEZ-BUALÓ,SANTIAGO M.
ABSTRACT The Mylodontidae Scelidotheriinae (Mammalia, Xenarthra, Tardigrada) are a diversified clade of South American fossil ground sloths, with a wide geographic distribution, especially in high and middle latitudes. According to the last revision, the Quaternary diversity includes the genera Scelidotherium, Catonyx, and Valgipes. The clade Scelidotheriinae is well represented in the Pleistocene of the Tarija-Padcaya basin, and the first mention of these ground sloths correspond to the middle of the XIX Century. Since then, several species (i.e., Scelidotherium tarijensis, Scelidodon tarijensis, Scelidotherium capellini) have been reported as inhabiting the Tarija-Padcaya basin during the Pleistocene. Despite the abundance of fossil records of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catonyx; Diversity; Pilosa; Pleistocene; South America.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400505

Differentially displayed expressed sequence tags in Melipona scutellaris (Hymenoptera, Apidae, Meliponini) development
Provedor de dados: 42
Autores: Santana,Flávia A.; Nunes,Francis M.F.; Vieira,Carlos U.; Machado,Maria Alice M.S.; Kerr,Warwick E.; Silva Jr,Wilson A.; Bonetti,Ana Maria.
We have compared gene expression, using the Differential Display Reverse Transcriptase - Polymerase Chain Reaction (DDRT-PCR) technique, by means of mRNA profile in Melipona scutellaris during ontogenetic postembryonic development, in adult worker, and in both Natural and Juvenile Hormone III-induced adult queen. Six, out of the nine ESTs described here, presented differentially expressed in the phases L1 or L2, or even in both of them, suggesting that key mechanisms to the development of Melipona scutellaris are regulated in these stages. The combination HT11G-AP05 revealed in L1 and L2 a product which matches to thioredoxin reductase protein domain in the Clostridium sporogenes, an important protein during cellular oxidoreduction processes. This study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Melipona scutellaris; Gene expression; DDRT-PCR.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100008

Seasonal, daily activity, and habitat use by three sympatric pit vipers (Serpentes, Viperidae) from southern Brazil
Provedor de dados: 42
Autores: ROCHA,MARCELO C.; HARTMANN,PAULO A.; WINCK,GISELE R.; CECHIN,SONIA Z.
Viperid snakes are widely distributed in the South America and the greater distribution range of the family is found at the Crotalinae subfamily. Despite the abundance of this snakes along their geographic distribution, some ecological aspects remain unknown, principally at subtropical areas. In the present study, we evaluated the activity (daily and seasonal) and the use of the habitat by Bothrops diporus, B. jararaca andB. jararacussu, in an Atlantic Forest area at southern Brazil. We observed higher incidence of viperid snakes during the months with higher temperatures, while no snakes were found during the months with lower temperatures. The data suggest the minimum temperature as environmental variable with the greatest influence on the seasonal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parque Estadual do Turvo; Rio Grande do Sul; Atlantic Forest; Bothrops; Activity pattern.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200695

Plankton community dynamics in a subtropical lagoonal system and related factors
Provedor de dados: 42
Autores: DONADEL,LETÍCIA; CARDOSO,LUCIANA DE S.; TORGAN,LEZILDA C.
ABSTRACT Changes of the plankton community in a shallow, subtropical lagoonal system and its relation to environmental conditions were investigated during an annual cycle to provide information on its spatial and seasonal variation pattern. The study carried out at four sites (three in the Peixe lagoon and one in the Ruivo lagoon), which are located in the Lagoa do Peixe National Park, southern Brazil. The system has a temporary connection to the Atlantic Ocean by a narrow channel. The phytoplankton density was higher in the Peixe lagoon whereas the specific richness was higher in the Ruivo lagoon which is also a site with the lower salinity. The phytoplankton biomass near the channel showed seasonal variation with the highest value in fall and lowest in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoon; Microalgae; Ramsar site; South Brazil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100249

Flavonoids from leaves of Derris urucu: assessment of potential effects on seed germination and development of weeds
Provedor de dados: 42
Autores: SILVA,EWERTON A.S. DA; LÔBO,LÍVIA T.; SILVA,GEILSON A. DA; SOUZA FILHO,ANTONIO PEDRO DA S.; SILVA,MILTON N. DA; ARRUDA,ALBERTO C.; GUILHON,GISELLE M.S.P.; SANTOS,LOURIVALDO S.; ARRUDA,MARA S.P.
In some previous studies, we described the isolation of nine compounds from leaves of Derris urucu, a species found widely in the Amazon rainforest, identified as five stilbenes and four dihydroflavonols. In this work, three of these dihydroflavonols [urucuol A (1), urucuol B (2) and isotirumalin (3)] were evaluated to identify their potential as allelochemicals, and we are also reporting the isolation and structural determination of a new flavonoid [5,3′-dihydroxy-4′-methoxy-(7,6:5″,6″)-2″,2″-dimethylpyranoflavanone (4)]. We investigated the effects of the dihydroflavonols 1-3 on seed germination and radicle and hypocotyl growth of the weed Mimosa pudica, using solutions at 150 mg.L–1. Urucuol B, alone, was the substance with the greatest potential to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Derris urucu; Flavonoids; Allelopathy; Development of weeds; Seed germination.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300881

Semiquantitative mercury determination in fish: a tool for poisoning prevention
Provedor de dados: 42
Autores: YALLOUZ,ALLEGRA V.; CALIXTO,TATIANA; HACON,SANDRA.
Human exposure to mercury intoxication through contaminated fish ingestion has been well studied, mainly among Japanese population. The Brazilian population, particulaly in the Amazon region, is now in focus due to findings of fish contamination. Major health impacts caused by mercury affect mostly people who have a regular fish diet. A continuous checking for mercury content in the most consumed fish could prevent human intoxication. A simple, non-instrumental method to allow a continuous checking of the mercury content in fish was developed. Based on this method, we are proposing a prevention action where community agents can be trained to perform fish analysis. Technical Schools and Universities located nearby the affected areas would be in charge of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mercury; Fish; Semiquantitative determination; Poisoning prevention.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100015

Effects of FGF-2 and EGF removal on the differentiationof mouse neural precursor cells
Provedor de dados: 42
Autores: Schwindt,Telma T.; Motta,Fabiana L.; Gabriela F.,Barnabé; Cristina G.,Massant; Guimarães,Alessander O.; Calcagnotto,Maria Elisa; Pesquero,João B.; Mello,Luiz E.
Cell therapy for neurological disorders has advanced, and neural precursor cells (NPC) may become the ideal candidates for neural transplantation in a wide range of diseases. However, additional work has to be done to determine either the ideal culture environment for NPC expansion in vitro, without altering their plasticity, or the FGF-2 and EGF mechanisms of cell signaling in neurospheres growth, survival and differentiation. In this work we evaluated mouse neurospheres cultured with and without FGF-2 and EGF containing medium and showed that those growth factors are responsible for NPC proliferation. It is also demonstrated that endogenous production of growth factors shifts from FGF-2 to IGF-1/PDGFb upon EGF and FGF-2 withdrawal. Mouse NPC cultured in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neural precursor cells; Neurosphere; Fibroblast growth factor 2; Epidermal growth factor; Differentiation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300009

Strategies by which some pathogenic trichomonads integrate diverse signals in the decision-making process
Provedor de dados: 42
Autores: LÓPEZ,LUCIENE BOTTENTUIT; BRAGA,MARIANE BANDEIRA DE MELO; ORTEGA LÓPEZ,JAIME; ARROYO,ROSSANA; SILVA FILHO,FERNANDO COSTA E.
The interaction between each one of Trichomonas vaginalis and Tritrichomonas foetus with their hosts is a complex process in which components associated to the cell surfaces of both parasites and host epithelial cells, and also to soluble components found in vaginal/urethral secretions, are involved. Either cytoadhesion or the cytotoxicity exerted by parasites to host cells can be dictated by virulence factors such as adhesins, cysteine proteinases, laminin-binding proteins, integrins, integrin-like molecules, a cell detachment factor, a pore-forming protein, and glycosidases among others. How trichomonads manipulate informations from the extracellular medium, transduce such informations, and respond to them by stimulating the activities of some surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichomonas vaginalis; Tritrichomonas foetus; Parasitic protozoa; Host-cell parasite interaction relationships; Trichomonal virulence.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200006

Scientific Integrity, Precambrian Acritarchs from Brazil and Mangroves and Climate Change
Provedor de dados: 42
Autores: Kellner,Alexander W. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200537

The structure of weakly stable minimal hypersurfaces
Provedor de dados: 42
Autores: Cheng,Xu; Cheung,Leung-Fu; Zhou,Detang.
In this short communication, we announce results from our research on the structure of complete noncompact oriented weakly stable minimal hypersurfaces in a manifold of nonnegative sectional curvature. In particular, a complete oriented weakly stable minimal hypersurface in Rm, m &gt; 4, must have only one end; any complete noncompact oriented weakly stable minimal hypersurface has only one end if the complete oriented ambient manifold Nm, m &gt; 7, has nonnegative sectional curvature and Ricci curvature bounded below by a positive constant; a complete oriented weakly stable minimal hypersurface in Rm, m &gt; 4, with finite total scalar curvature is a hyperplane.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minimal hypersurfaces; Weak stability; Ends.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200001

Biaxial testing of canine annulus fibrosus tissue under changing salt concentrations
Provedor de dados: 42
Autores: Huyghe,Jacques M.
The in vivo mechanics of the annulus fibrosus of the intervertebral disc is one of biaxial rather than uniaxial loading. The material properties of the annulus are intimately linked to the osmolarity in the tissue. This paper presents biaxial relaxation experiments of canine annulus fibrosus tissue under stepwise changes of external salt concentration. The force tracings show that stresses are strongly dependent on time, salt concentration and orientation. The force tracing signature of are sponse to a change instrain, is one of a jumpin stress that relaxes partly as the new strain is maintained. The force tracing signature of a stepwise change in salt concentration is a progressive monotonous change in stress towards a new equilibrium value. Although the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Swelling; Collagen; Osmosis; Donnan; Cartilaginous.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100012

Function of ganglioside 9-O-acetyl GD3 in neuronal migration
Provedor de dados: 42
Autores: SANTIAGO,MARCELO F.; BERREDO-PINHO,MARCIA; GANDRA,MARIO; CAVALCANTE,LENY A.; MENDEZ-OTERO,ROSALIA.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300032

Do carcasses of lambs finished on commercial production systems meet market standards?
Provedor de dados: 42
Autores: LÔBO,RAIMUNDO N.B.; CHAPARRO-PINZÓN,ANDRÉS; MELO NETO,FRANCISCO V.O.; LIMA,LISIANE D.; BATISTA,ANA SANCHA M.; LÔBO,ANA MARIA B.O.
ABSTRACT This study aimed to characterize a commercial lamb finishing system using animals of undefined breed from production to slaughter by analyzing performance, carcass traits, yield of commercial cuts, and the quality and meat acceptance of different slaughter groups, as to evaluate whether this system provides the market with a standardized product. The lots were not homogeneous for yield of commercial cuts and performance and morphometric traits evaluated in vivo. The groups were heterogeneous to 75% of the 13 carcass traits evaluated, among them, hot and cold carcass weights, hot and cold carcass yields, carcass grade finishing and biological yield. There was also no uniformity for the proportion of non-carcass components, morphometry of carcass,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass morphology; Carcass yields; Fatty acid; Sensory analysis; Slaughter weight.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401671

Testing multivariate analysis in paleoenvironmental reconstructions using pollen records from Lagoa Salgada, NE Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Toledo,Mauro B. de; Barth,Ortrud M.; Silva,Cleverson G.; Barros,Marcia A.
Despite the indisputable significance of identification of modern analogs for Paleoecology research, relatively few studies attempted to integrate modern and fossil samples on paleoenvironmental reconstructions. In Palynology, this general pattern is not different from other fields of Paleoecology. This study demonstrates the practical application of modern pollen deposition data on paleoenvironmental reconstructions based on fossil pollen by using multivariate analysis. The main goal of this study was to use Detrended Correspondence Analysis (DCA) to compare pollen samples from two sediment cores collected at Lagoa Salgada, a coastal lagoon located at northeastern Rio de Janeiro State. Furthermore, modern surface samples were also statistically compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multivariate analysis; Paleoenvironmental reconstruction; Quaternary palynology; Lagoa Salgada.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400013

Comments on Triassic pterosaurs with discussion about ontogeny and description of new taxa
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Eudimorphodon ranzii was the first Triassic pterosaur to be described and several specimens have been referred to this taxon mainly based on the presence of multicuspid teeth. Since this dental feature has been observed in several other pterosaurs, the revision of some specimens assigned to Eudimorphodon shows that they represent new taxa as follows: Arcticodactyluscromptonellus (comb. nov.), Austriadraco dallavecchiai (gen. et sp. nov.) and Bergamodactyluswildi (gen. et sp. nov.). A preliminary analysis of pterosaur ontogeny resulted in the recognition of six distinct ontogenetic stages (OS1-6). According to this classification, the holotype of Arcticodactyluscromptonellus has reached OS2, and although being ontogenetically much younger than others, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Ontogeny; Eudimorphodon; Arcticodactylus; Austriadraco; Bergamodactylus.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200669

Diversity of insect galls associated with coastal shrub vegetation in Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: CARVALHO-FERNANDES,SHEILA P.; ASCENDINO,SHARLENE; MAIA,VALÉRIA C.; COURI,MÁRCIA S.
ABSTRACT Surveys in the coastal sandy plains (restingas) of Rio de Janeiro have shown a great richness of galls. We investigated the galling insects in two preserved restingas areas of Rio de Janeiro state: Parque Estadual da Costa do Sol and Reserva Particular do Patrimônio Natural Fazenda Caruara. The collections were done each two months, from June 2011 to May 2012. We investigated 38 points during 45 minutes each per collection. The galls were taken to the laboratory for rearing the insects. A total number of 151 insect galls were found in 82 plant species distributed into 34 botanic families. Most of the galls occurred on leaves and the plant families with the highest richness of galls were Myrtaceae and Fabaceae. All the six insect orders with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Galling insects; Sandy coastal plain; Cecidomyiid; Arthropod-plant interaction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401407

A science framework (SF) for agricultural sustainability
Provedor de dados: 42
Autores: AHMED,FERDOUS; AL-AMIN,ABUL Q.; MASUD,MUHAMMAD M.; KARI,FATIMAH; MOHAMAD,ZEEDA.
The significance of Science Framework (SF) to date is receiving more acceptances all over the world to address agricultural sustainability. The professional views, however, advocate that the SF known as Mega Science Framework (MSF) in the transitional economies is not converging effectively in many ways for the agricultural sustainability. Specially, MSF in transitional economies is mostly incapable to identify barriers in agricultural research, inadequate to frame policy gaps with the goal of strategizing the desired sustainability in agricultural technology and innovation, inconsistent in finding to identify the inequities, and incompleteness to rebuild decisions. Therefore, this study critically evaluates the components of MSF in transitional economies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Science framework; Sustainable development; Agricultural sustainability; Research and innovation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401887

Biochemical characterization of the nuclease StoNurA from the hyperthermophilic archaeon Sulfolobus tokodaii
Provedor de dados: 42
Autores: Wei,Tao; Yang,Kunpeng; Zang,Jie; Mao,Duobin.
Abstract The DNA nuclease gene ST2109 has been cloned from the hyperthermophilic archaeon Sulfolobus tokodaii and expressed in Escherichia coli. The recombinant protein StoNurA has been purified to homogeneity by affinity chromatography and gel filtration chromatography. Biochemical analyses demonstrated that StoNurA exhibited DNA binding and 5’–3’ exonuclease activities towards ssDNA and dsDNA. The temperature and pH optima of StoNurA were determined to be 65 °C and 8.0, respectively. The activity of StoNurA was found to be dependent of Mn2+, and its half-life of heat inactivation at 100 °C was 5 min. Gel filtration chromatography revealed that StoNurA could form dimers in solution. Pull-down assays also showed that StoNurA physically interacted with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA nuclease; StoNurA; Dimer; Interaction; Recombinational repair.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602731

On the retrieval of significant wave heights from spaceborne Synthetic Aperture Radar (ERS-SAR) using the Max-Planck Institut (MPI) algorithm
Provedor de dados: 42
Autores: Violante-Carvalho,Nelson.
Synthetic Aperture Radar (SAR) onboard satellites is the only source of directional wave spectra with continuous and global coverage. Millions of SAR Wave Mode (SWM) imagettes have been acquired since the launch in the early 1990's of the first European Remote Sensing Satellite ERS-1 and its successors ERS-2 and ENVISAT, which has opened up many possibilities specially for wave data assimilation purposes. The main aim of data assimilation is to improve the forecasting introducing available observations into the modeling procedures in order to minimize the differences between model estimates and measurements. However there are limitations in the retrieval of the directional spectrum from SAR images due to nonlinearities in the mapping mechanism. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wind waves; Synthetic Aperture Radar (ERS-SAR); Max-Planck Institut (MPI) Algorithm; Campos Basin; WAM wave model; Heave-pitch-roll buoy measurements.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400012

Sedimentary changes on the Southeastern Brazilian upper slope during the last 35,000 years
Provedor de dados: 42
Autores: Mahiques,Michel M.; Fukumoto,Marina M.; Silveira,Ilson C.A.; Figueira,Rubens C.L.; Bícego,Marcia C.; Lourenço,Rafael A.; Mello-e-Sousa,Silvia H.
A first evaluation of the sedimentary changes, including accumulation of inorganic and organic carbon on the upper slope off Southeastern Brazil under different climatic conditions, based on the analysis of a sedimentary core, is here presented. Results indicate that sedimentation rate as well sedimentary characteristics, including the nature of the organic carbon deposited during the LGM (Last Glacial Maximum), were different from the present deposition, indicating higher primary productivity during the LGM, to be accounted for by the higher values of marine organic carbon. Nevertheless, the higher values of Accumulation Rate of calcium carbonate and organic carbon can be credited to the higher values of the sedimentation rates. Conditions prevailing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentation; Accumulation rate; Upper slope; Southeastern Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100018

Speeds and stance of titanosaur sauropods: analysis of Titanopodus tracks from the Late Cretaceous of Mendoza, Argentina
Provedor de dados: 42
Autores: González Riga,Bernardo J.
Speed estimations from trackways of Titanopodus mendozensis González Riga and Calvo provide information about the locomotion of titanosaurian sauropods that lived in South America during the Late Cretaceous. Titanopodus ichnites were found at Agua del Choique, a newly discovered track site in the Loncoche Formation, Late Campanian-Early Maastrichtian of Mendoza, Argentina. This speed study follows the hypothesis of dynamic similarity proposed by Alexander. As a refinement of this method, a complementary equation is presented here based on an articulated titanosaurian specimen collected in strata that are regarded as correlative to those that have yielded Titanopodus tracks (Allen Formation, Neuquén Basin). This analysis indicates that hip height can be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Speed; Sauropoda; Titanopodus; Cretaceous; Argentina.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100016

Psychotria viridis: Chemical constituents from leaves and biological properties
Provedor de dados: 42
Autores: SOARES,DÉBORA B.S.; DUARTE,LUCIENIR P.; CAVALCANTI,ANDRÉ D.; SILVA,FERNANDO C.; BRAGA,ARIADNE D.; LOPES,MIRIAM T.P.; TAKAHASHI,JACQUELINE A.; VIEIRA-FILHO,SIDNEY A.
ABSTRACT The phytochemical study of hexane, chloroform and methanol extracts from leaves of Psychotria viridis resulted in the identification of: the pentacyclic triterpenes, ursolic and oleanolic acid; the steroids, 24-methylene-cycloartanol, stigmasterol and β-sitosterol; the glycosylated steroids 3-O-β-D-glucosyl-β-sitosterol and 3-O-β-D-glucosyl-stigmasterol; a polyunsaturated triterpene, squalene; the esters of glycerol, 1-palmitoylglycerol and triacylglycerol; a mixture of long chain hydrocarbons; the aldehyde nonacosanal; the long chain fat acids hentriacontanoic, hexadecanoic and heptadenoic acid; the ester methyl heptadecanoate; the 4-methyl-epi-quinate and two indole alkaloids, N,N-dimethyltryptamine (DMT) and N-methyltryptamine. The chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psychotria viridis Rubiaceae N; N-dimethyltryptamine B16F10 4T1 tumor cells.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300927

Acoustic communication in the Red-vented Bulbul Pycnonotus cafer
Provedor de dados: 42
Autores: Kumar,Anil.
This paper deals with acoustic communication in the Red-vented Bulbul Pycnonotus cafer. This species emits a high variety of vocal signals that can be classified on the basis of their acoustical features and context of production. Individuals sang throughout the year and most songs were discrete and stereotyped. The songs were composed of strophes (phrases) with minor structural variations of elements that were preceded and followed by a temporal gap (3 to 12s). Most strophes were composed of 2 to 6 elements that were often dissimilar in structure and ranging from 0.98 to 4.5 kHz. The biological function of the song appeared to be to maintain pair bonds and to synchronize breeding activities. Different types of context-specific calls were identified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic communication; Pycnonotus cafer; Bird song; Alarm calls; Roosting calls; Flight calls.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200024

An Analysis of Total Phosphorus Dispersion in Lake Used As a Municipal Water Supply
Provedor de dados: 42
Autores: LIMA,RÔMULO C.; MESQUITA,ANDRÉ L.A.; BLANCO,CLAUDIO J.C.; SANTOS,MARIA DE LOURDES S.; SECRETAN,YVES.
ABSTRACTIn Belém city is located the potable water supply system of its metropolitan area, which includes, in addition to this city, four more municipalities. In this water supply complex is the Água Preta lake, which serves as a reservoir for the water pumped from the Guamá river. Due to the great importance of this lake for this system, several works have been devoted to its study, from the monitoring of the quality of its waters to its hydrodynamic modeling. This paper presents the results obtained by computer simulation of the phosphorus dispersion within this reservoir by the numerical solution of two-dimensional equation of advection-diffusion-reaction by the method θ/SUPG. Comparing these results with data concentration of total phosphorus collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus dispersion; Advection-diffusion-reaction equation; Θ/SUPG-method; Finite elements.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401505

Scientific Performance of Brazilian Researchers in Pharmacology with grants from CNPq: A comparative study within the Brazilian categories
Provedor de dados: 42
Autores: KAMDEM,JEAN P.; ABOLAJI,AMOS O.; ROOS,DANIEL H.; CALABRÓ,LUCIANA; BARBOSA,NILDA V.; SOUZA,DIOGO O.; ROCHA,JOÃO BATISTA T.
ABSTRACT In Brazil, scientific performance of researchers is one important criteria for decision-making in grant allocation. In this context, this study aimed to evaluate and compare the profile of 82 seniors' investigators (graded as level 1A-D) which were receiving CNPq (National Council for Scientific and Technological Development) productivity grant in Pharmacology, by analyzing the pattern of citation of their papers and h-index. Total documents, citations (with and without self-citations) and h-index (with and without self-citations) were retrieved from the Scopus database. The results indicated a clear difference among researchers from the higher categories (1A and 1B) in most of the parameters analyzed. However, no noticeable differentiation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometric analyses; Brazilian scientific performance; Citation analysis; CNPq; Pharmacology; Scientometrics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501735

Inactivated Parapoxvirus ovis as inducer of immunity in silver catfish (Rhamdia quelen)
Provedor de dados: 42
Autores: PAVAN,TATIANA R.; NIED,CRISTIAN O.; NORO,MIRELA; ANZILIERO,DENIZ; FRANDOLOSO,RAFAEL; KREUTZ,LUIZ CARLOS.
ABSTRACT Molecules with immune modulating activity are ubiquitously distributed in nature and their impact on aquaculture has been exploited in order to increase fish resistance to pathogens. Here, we investigated the effect of inactivated Parapoxvirus ovis (iPPVO) on blood cells and innate and acquired immune response of silver catfish (Rhamdia quelen). iPPVO inoculation had no effect on respiratory burst activity; however, following iPPVO inoculation, we observed a significant decrease on circulating monocytes concomitantly with an increased number of heterophilic granulocytes and thrombocytes, which are the main cells involved in innate immunity and provide connection with acquired immunity. Fish inoculated with a combination of bovine serum albumin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Immunostimulant; Adjuvant; Antibody; Fish.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401451

An experimental study of the partitioning of trace elements between rutile and silicate melt as a function of oxygen fugacity
Provedor de dados: 42
Autores: MALLMANN,GUILHERME; FONSECA,RAÚL O.C.; SILVA,ADOLFO B.
Subduction zone or arc magmas are known to display a characteristic depletion of High Field Strength Elements (HFSE) relative to other similarly incompatible elements, which can be attributed to the presence of the accessory mineral rutile (TiO2) in the residual slab. Here we show that the partitioning behavior of vanadium between rutile and silicate melt varies from incompatible (∼0.1) to compatible (∼18) as a function of oxygen fugacity. We also confirm that the HFSE are compatible in rutile, with D(Ta)&gt; D(Nb)&gt;&gt; (D(Hf)&gt;/∼ D(Zr), but that the level of compatibility is strongly dependent on melt composition, with partition coefficients increasing about one order of magnitude with increasing melt polymerization (or decreasing basicity). Our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arc magma; HFSE; Partition coefficient; Redox; Rutile.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401609

Reproductive biology of the Green Ground Snake Erythrolamprus poecilogyrus sublineatus (Serpentes: Dipsadidae) in Subtropical Brazil
Provedor de dados: 42
Autores: QUINTELA,FERNANDO M.; MARQUES,WILIAM C.; LOEBMANN,DANIEL.
ABSTRACT  We investigated reproductive features of the dipsadid snake Erythrolamprus poecilogyrus sublineatus in the southernmost Brazilian coast, a subtropical region characterized by well-marked seasons. Females are significantly smaller than males, have a shorter tail, and reach sexual maturity at later times along their development. In contrast to tropical subspecies, E. p. sublineatus females presented a seasonal pattern, with secondary follicles occurring from late winter to early autumn and egg production restricted to the whole spring and early summer. Males presented seasonal variation in testes volume (increase in autumn and decrease in winter) while no significant seasonal variation was found in ductus deferens width. The number of oviductal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Neotropics; Pampa Biome; Reproduction; Squamata.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502189

Sequential sampling of Bemisia tuberculata (Bondar, 1923) (Hemiptera: Aleyrodidae) on cassava crop
Provedor de dados: 42
Autores: SILVA,ANTONIO S.; MOTA,THIAGO A.; FERNANDES,MARCOS G.; KASSAB,SAMIR O.
Estimate efficiently of the whitefly population (Bemisia tuberculata Bondar) in cassava, to assist in decision making of pest control is one of the advantages of sequential sampling plans. Therefore, the objective of this study was to determine a sequential sampling plan according to two methods of pest management, using biological and/or chemical control. Samples were obtained in a commercial field of 2.500,00 m2, divided into 100 plots. The visualization method was used for sampling of the upper leaves by counting the number of adults. In total 15 samples were taken weekly from January to April 2012. The spatial distribution model which best fit to the behavior of B. tuberculata adults was the negative binomial distribution. Levels adapted for biological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decision-making; Level of damage; Manihot esculenta; Pest management; Whitefly.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200889

Detection of P element transcripts in embryos of Drosophila melanogaster and D. willistoni
Provedor de dados: 42
Autores: Blauth,Monica L.; Bruno,Rafaela V.; Abdelhay,Eliana; Loreto,Elgion L.S.; Valente,Vera L.S.
The P element is one of the most thoroughly studied transposable elements (TE). Its mobilization causes the hybrid dysgenesis that was first described in Drosophila melanogaster. While studies of the P element have mainly been done in D. melanogaster, it is believed that Drosophila willistoni was the original host species of this TE and that P was transposed to the D. melanogaster genome by horizontal transfer. Our study sought to compare the transcriptional behavior of the P element in embryos of D. melanogaster, which is a recent host, with embryos of two strains of D. willistoni, a species that has contained the P element for a longer time. In both species, potential transcripts of transposase, the enzyme responsible for the TE mobilization, were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; D. willistoni hybrid dysgenesis RNAi P element transposable element.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400007

Limiting behavior of delayed sums under a non-identically distribution setup
Provedor de dados: 42
Autores: Pingyan,Chen.
We present an accurate description the limiting behavior of delayed sums under a non-identically distribution setup, and deduce Chover-type laws of the iterated logarithm for them. These complement and extend the results of Vasudeva and Divanji (Theory of Probability and its Applications, 37 (1992), 534-542).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stable distribution; Laws of iterated logarithm; Delayed sum.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400003

The Lages diatremes: mineral composition and petrological implications
Provedor de dados: 42
Autores: Barabino,Giancarlo; Gomes,Celso B.; Traversa,Gianbosco.
Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel, which represent disaggregated fragments of spinel, spinel+garnet and garnet facies peridotite; II) low-Cr aluminian pyroxene that occurs as megacrysts are high pressure phases (7-12 kb) being crystallized from an alkaline-like evolving magma; III) low-Cr aluminian diopside of crustal origin. Evidence of carbonatitic cryptic metasomatic enrichment is shown by clinopyroxenes of Groups I and II. The data do not support a kimberlitic affinity as it has been suggested for the diatremes. Rather, they are interpreted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Mantle; Clinopyroxene; Megacryst; Metasomatism.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300010

Bridging molecular and continuous descriptions: the case of dynamics in clays
Provedor de dados: 42
Autores: Dufrêche,Jean-François; Rotenberg,Benjamin; Marry,Virginie; Turq,Pierre.
The theory of transport in porous media such as clays depends on the level of description. On the macroscopic scale,hydrodynamics equations are used. These continuous descriptions are convenient to model the fluid motion in a confined system. Nevertheless, they are valid only if the pores of the material are much larger than the molecular size of the components of the system. Another approach consists in using molecular descriptions. These two methods which correspond to different levels of description are complementary. The link between them can be clarified by using a coarse-graining procedure where the microscopic laws are averaged over fast variables to get the long time macroscopic laws. We present such an approach in the case of clays. Firstly, we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clays; Multi-scale modelling; Molecular dynamics; Hydrodynamics; Brownian model.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100006

The song of the Brazilian population of Humpback Whale Megaptera novaeangliae, in the year 2000: individual song variations and possible implications
Provedor de dados: 42
Autores: Arraut,Eduardo M.; Vielliard,Jacques M.E.
The song of the Brazilian population of the Humpback Whale Megaptera novaeangliae was studied in its breeding and calving ground, the Abrolhos Bank, Bahia, Brazil, from July to November 2000. Aural and spectral analyses of digital recordings were completed for approximately 20 song cycles, totaling 5 hours of song from 10 different recording events. We identified 24 note types, organized in five themes. All songs presented the same themes and the order in which they were sung did not vary. We registered the appearance of a note type and the disappearance of a phrase ending, which indicate that the song changed as the season progressed. Moreover, we detected individual variation in the way singers performed certain complex note types. As songs are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humpback Whale; Megaptera novaeangliae; Song; Brazilian population; 2000; Individual song variation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200028

Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf
Provedor de dados: 42
Autores: Mahiques,Michel M. de; Bícego,Marcia C.; Silveira,Ilson C.A.; Sousa,Silvia H.M.; Lourenço,Rafael A.; Fukumoto,Marina M.
The analyses of Uk'37 paleotemperatures and sedimentological parameters in box cores from the Cabo Frio upwelling zone, southeastern Brazil, were used to understand the modern sedimentation as well as to evaluate the role played by the upwelling process in the sedimentary patterns. Three box-cores located closer to the upwelling area show a general trend of cooling waters taking place in the last 700 years. Since the present upwelling is dependent on local and remote wind regime, a phase of dominating NE winds favors a more effective upward transport of the cold thermocline level South Atlantic CentralWater towards the coast. The intensification in the upwelling regime for the last ca. 700 years can be associated with the strengthening of the NE winds off...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentation; Alkenones; Bulk organic matter; Upwelling; Brazil; South Atlantic.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300013

Within-plant distribution of cotton aphid (Hemiptera: Aphididae) in cotton cultivars with colored fibers
Provedor de dados: 42
Autores: Fernandes,Francisco S.; Ramalho,Francisco S.; Malaquias,José B.; Nascimento Junior,José L.; Correia,Ezequias T.; Zanuncio,José C.
We describe the vertical and horizontal distribution of the cotton aphid Aphis gossypii Glover within a cotton plant in two cotton (Gossypium hirsutum Linnaeus) cultivars (BRS Safira and BRS Rubí) with colored fiber over the time. Measurements of aphid population dynamics and distribution in the cotton plants were recorded in intervals of seven days. The number of apterous or alate aphids and their specific locations were recorded, using as a reference point the location of nodes on the mainstem of the plant and also those on the leaves present on branches and fruit structures. The number of apterous aphids found on the cultivar BRS Safira (56,515 aphids) was greater than that found on BRS Rubí (50,537 aphids). There was no significant difference between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphis gossypii; Behavior; Cotton with colored fibers; Distribution.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300013

Life History Parameters of Genypterus brasiliensis (Teleostei: Ophidiidae), an Endemic Fisheries Resource of the Southwestern Atlantic
Provedor de dados: 42
Autores: TOMÁS,ACÁCIO R.G.; ELEUTERIO,CELSO L.T.; VELASCO,GONZALO.
Abstract: Genypterus brasiliensis, a demersal fish of large size (1.3 m of total length), occurs in the southwest Atlantic (23 to 38oS) and well appreciated due to the quality of its flesh. It was analyzed through longline and trawl fisheries, and the average length and weight of 724 specimens were significantly different between them, with the biggest and heaviest specimens caught by the former. The weight-length relationships were significantly different based upon sex: females Wt=4x10-7Lt3.3799; r2=0.97; n=262; p&lt;0.001, and males: Wt=4x10-7Lt3.3886; r2=0.95; n=190; p&lt;0.001. Using the otoliths readings for 153 specimens (APE of 2% and CV of 4.2%), the growth parameters estimates reveal statistical differences between sexes (p=0.05; r2=0.889). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Endemism; Fishes; Fisheries.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500609

Evaluating antimicrobial and antioxidant capacity of endemic Phlomis russeliana from Turkey and its antiproliferative effect on Human Caco-2 Cell Lines
Provedor de dados: 42
Autores: ALPAY,MERVE; DULGER,GORKEM; SAHIN,IBRAHIM E.; DULGER,BASARAN.
Abstract: In this study, the antimicrobial, antioxidant and antitumor activity of ethanol extracts obtained from Phlomis russeliana (Sims.) Lag. ex Benth. (Lamiaceae) were evaluated. Disc diffusion and microdilution methods were used to test the extracts for antimicrobial activity against seven bacteria strains (Bacillus cereusATCC 7064, Bacillus subtilisATCC 6633, Staphylococcus aureusATCC 6538P, Escherichia coliATCC 10538, Proteus vulgarisATCC 6899, Salmonella typhimuriumCCM 5445 and Pseudomonas aeruginosaATCC 27853) and four yeast strains (Kluyveromyces fragilisATCC 8608, Rhodotorula rubraATCC 70403, Debaryomyces hanseniiDSM 70238 and Candida albicansATCC 10239). Notably, they were more effective against the yeast strains than the bacterial strains. Of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phlomis russeliana; Antioxidant activity; Cytotoxic effect; Antimicrobial activity; Endemic plant.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500604

The extracellular matrix of the lung and its role in edema formation
Provedor de dados: 42
Autores: Pelosi,Paolo; Rocco,Patricia R.M.; Negrini,Daniela; Passi,Alberto.
The extracellular matrix is composed of a three-dimensional fiber mesh filled with different macromolecules such as: collagen (mainly type I and III), elastin, glycosaminoglycans, and proteoglycans. In the lung, the extracellular matrix has several functions which provide: 1) mechanical tensile and compressive strength and elasticity, 2) low mechanical tissue compliance contributing to the maintenance of normal interstitial fluid dynamics, 3) low resistive pathway for an effective gas exchange, d) control of cell behavior by the binding of growth factors, chemokines, cytokines and the interaction with cell-surface receptors, and e) tissue repair and remodeling. Fragmentation and disorganization of extracellular matrix components comprises the protective...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Collagen; Glycosaminoglycans; Proteoglycan; Interstitial pressure.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200010

Consequences of gestational diabetes to the brain and behavior of the offspring
Provedor de dados: 42
Autores: SOUSA,RICARDO A.L. DE; TORRES,YASMIN S.; FIGUEIREDO,CLAUDIA P.; PASSOS,GISELLE F.; CLARKE,JULIA R.
ABSTRACT Gestational diabetes mellitus (GD) is a form of insulin resistance triggered during the second/third trimesters of pregnancy in previously normoglycemic women. It is currently estimated that 10% of all pregnancies in the United States show this condition. For many years, the transient nature of GD has led researchers and physicians to assume that long-term consequences were absent. However, GD diagnosis leads to a six-fold increase in the risk of developing type 2 diabetes (T2D) in women and incidence of obesity and T2D is also higher among their infants. Recent and concerning evidences point to detrimental effects of GD on the behavior and cognition of the offspring, which often persist until adolescence or adulthood. Considering that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insulin resistance; Hippocampus; Inflammation; Depression; Learning; Memory; Programing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502279

Polymer based gas sensors
Provedor de dados: 42
Autores: Melo,Celso P. de.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400033

Chemistry Inspired by the Colors of Fruits, Flowers and Wine
Provedor de dados: 42
Autores: QUINA,FRANK H.; BASTOS,ERICK L.
ABSTRACT An overview is provided of the status of research at the frontiers of investigation of the chemistry and photochemistry of two classes of natural plant pigments, the anthocyanins and the betalains, as well as of the pyranoanthocyanin pigments formed from anthocyanins during the maturation of red wine. Together, anthocyanins and betalains are responsible for almost all of the red, purple and blue colors of fruits and flowers and anthocyanins and pyranoanthocyanins are major contributors to the color of red wines. All three types of pigments are cationic below about pH 3, highly colored, non-toxic, reasonably soluble in water or alcohol and fairly stable to light. They exhibit good antioxidant or antiradical activity and, as part of our diet, confer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthocyanins; Betalains; Flowers; Plant pigments; Wine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200681

Complete assignments of NMR data and assessment of trypanocidal activity of new eremantholide C derivatives
Provedor de dados: 42
Autores: SAÚDE-GUIMARÃES,DÊNIA A.; RASLAN,DÉLIO S.; CHIARI,EGLER; OLIVEIRA,ALAÍDE B. DE.
Chemical transformations of eremantholide C (1), a sesquiterpene lactone that was isolated from Lychnophora trichocarpha Spreng. led to five new derivatives: 1′,2′- epoxyeremantholide C (2), 5-n-propylamine-4,5-dihydro-1′,2′-epoxyeremantholide C (3), 5-n-propylammonium-4,5-dihydro-1′,2′-epoxyeremantholide C chloride (4), 5-n-propylammonium-4,5-dihydroeremantolide C chloride (5) and 16-O-ethyleremantholide C (6). The structures of all these derivatives were assigned on the basis of IR, MS, 1H and 13C NMR data by 1D and 2D techniques. Eremantholide C and the derivatives 2, 4 and 5 were evaluated against trypomastigotes Y and CL strains of Trypanosoma cruzi. Eremantholide C completely inhibited the growth of both the parasites strains while all derivatives...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eremantholide C derivatives; Lychnophora trichocarpha; NMR; Sesquiterpene lactones; Trypanocidal activity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401563

Karyotype analysis, DNA content and molecular screening in Lippia alba (Verbenaceae)
Provedor de dados: 42
Autores: Pierre,Patrícia M.O.; Sousa,Saulo M.; Davide,Lisete C.; Machado,Marco A.; Viccini,Lyderson F.
Cytogenetic analyses, of pollen viability, nuclear DNA content and RAPD markers were employed to study three chemotypes of Lippia alba (Mill.) (Verbenaceae) in order to understand the genetic variation among them. Different ploidy levels and mixoploid individuals were observed. This work comprises the first report of different chromosome numbers (cytotypes) in L. alba. The chromosome numbers of La2-carvone and La3-linalool chemotypes suggested that they are polyploids. Flow cytometric analysis showed an increase of nuclear DNA content that was not directly proportional to ploidy level variation. A cluster analysis based on RAPD markers revealed that La3-linalool shares genetic markers with La1-citral and La2-carvone. The analysis showed that the majority...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cheotype; Cytogenetic; Cytotype; DNA content; RAPD; Lippia alba.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300018

New classes of spatial central configurations for the 7-body problem
Provedor de dados: 42
Autores: FERNANDES,ANTONIO CARLOS; MELLO,LUIS FERNANDO.
In this paper we show the existence of new families of spatial central configurations for the 7-body problem. In the studied spatial central configurations, six bodies are at the vertices of two equilateral triangles,  and one body is located out of the parallel distinct planes containing  and . The results have simple and analytic proofs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial central configuration; 7-body problem; Stacked central configuration; Central configuration.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100003

Tectonic evolution of the Asunción Rift, Eastern Paraguay
Provedor de dados: 42
Autores: RICCOMINI,CLAUDIO; VELÁZQUEZ,VICTOR F.; GOMES,CELSO B.; MILAN,ANDERSON; SALLUN,ALETHÉA E. M.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300046

Hypersurfaces with constant mean curvature and two principal curvatures in n+1
Provedor de dados: 42
Autores: Alías,Luis J.; Almeida,Sebastião C. de; Brasil Jr.,Aldir.
In this paper we consider compact oriented hypersurfaces M with constant mean curvature and two principal curvatures immersed in the Euclidean sphere. In the minimal case, Perdomo (Perdomo 2004) andWang (Wang 2003) obtained an integral inequality involving the square of the norm of the second fundamental form of M, where equality holds only if M is the Clifford torus. In this paper, using the traceless second fundamental form of M, we extend the above integral formula to hypersurfaces with constant mean curvature and give a new characterization of the H(r)-torus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypersurfaces; Constant mean curvature; Simons formula; H(r)-torus.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300003

Effect of Bauhinia holophylla treatment in Streptozotocin-induced diabetic rats
Provedor de dados: 42
Autores: PINHEIRO,MARCELO S.; RODRIGUES,LUHARA S.; S. NETO,LEILA; MORAES-SOUZA,RAFAIANNE Q.; SOARES,THAIGRA S.; AMÉRICO,MADILEINE F.; CAMPOS,KLEBER E.; DAMASCENO,DÉBORA C.; VOLPATO,GUSTAVO T.
ABSTRACT Bauhinia holophylla, commonly known as “cow’s hoof”, is widely used in Brazilian folk medicine for the diabetes treatment. Therefore, the aim of this study was at evaluating the aqueous extract effect of Bauhinia holophylla leaves treatment on the streptozotocin-induced diabetic rats. Diabetes was induced by Streptozotocin (40 mg/Kg) in female Wistar rats. Oral administration of aqueous extract of Bauhinia holophylla leaves was given to non-diabetic and diabetic rats at a dose of 400 mg/kg during 21 days. On day 17 of treatment, the Oral Glucose Tolerance Test was performed to determine the area under the curve. At the end of the treatment, the animals were anesthetized and blood was collected for serum biochemical parameters analysis. After...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bauhinia holophylla; Diabetes; Lipid profile; Medicinal plants; Rats.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100263

Rhizophores in Rhizophora mangle L: an alternative interpretation of so-called ''aerial roots''
Provedor de dados: 42
Autores: Menezes,Nanuza L. de.
Rhizophora mangle L., one of the most common mangrove species, has an aerial structure system that gives it stability in permanently swampy soils. In fact, these structures, known as "aerial roots" or "stilt roots", have proven to be peculiar branches with positive geotropism, which form a large number of roots when in contact with swampy soils. These organs have a sympodial branching system, wide pith, slightly thickened cortex, collateral vascular bundles, polyarch stele and endarch protoxylem, as in the stem, and a periderm produced by a phellogen at the apex similar to a root cap. They also have the same type of trichosclereid that occurs in the stem, with negative geotropism, unlike true Rhizophora roots, which do not form trichosclereids at all. On...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizophora mangle L; Aerial roots; Stilt roots.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200003

Morphometry and mixing regime of a tropical lake: Lake Nova (Southeastern Brazil)
Provedor de dados: 42
Autores: GONÇALVES,MONICA A.; GARCIA,FÁBIO C.; BARROSO,GILBERTO F.
ABSTRACT Lake Nova (15.5 km2) is the second largest lake in the Lower Doce River Valley (Southeastern Brazil). A better understanding of ecosystem structure and functioning requires knowledge about lake morphometry, given that lake basin form influences water column stratification. The present study aims to contribute to the understanding of relationship between morphometry and mixing patterns of deep tropical lakes in Brazil. Water column profiles of temperature and dissolved oxygen were taken on four sampling sites along the lake major axis during 2011, 2012 and 2013. The bathymetric survey was carried out in July 2011, along 131.7 km of hydrographic tracks yield 51,692 depth points. Morphometric features of lake size and form factors describe the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lake morphometry; Bathymetry; Tropical lakes; Mixing pattern; Geographic information system.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401341

Cytotoxic and toxicological effects of phthalimide derivatives on tumor and normal murine cells
Provedor de dados: 42
Autores: FERREIRA,PAULO MICHEL PINHEIRO; COSTA,PATRICIA MARÇAL DA; COSTA,ARINICE DE MENEZES; LIMA,DAISY JEREISSATI BARBOSA; DRUMOND,RENATA ROSADO; SILVA,JURANDY DO NASCIMENTO; MOREIRA,DIOGO RODRIGO DE MAGALHÃES; OLIVEIRA FILHO,GEVÂNIO BEZERRA DE; FERREIRA,JAMILE MAGALHÃES; QUEIROZ,MARIA GORETTI RODRIGUES DE; LEITE,ANA CRISTINA LIMA; PESSOA,CLÁUDIA.
Eleven phthalimide derivatives were evaluated with regards to their antiproliferative activity on tumor and normal cells and possible toxic effects. Cytotoxic analyses were performed against murine tumors (Sarcoma 180 and B-16/F-10 cells) and peripheral blood mononuclear cells (PBMC) using MTT and Alamar Blue assays. Following, the investigation of cytotoxicity was executed by flow cytometry analysis and antitumoral and toxicological potential by in vivo techniques. The molecules 3b, 3c, 4 and 5 revealed in vitro cytotoxicity against Sarcoma 180, B-16/F-10 and PBMC. Since compound 4 was the most effective derivative, it was chosen to detail the mechanism of action after 24, 48 and 72 h exposure (22.5 and 45 µM). Sarcoma 180 cells treated with compound 4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Histological alterations; Murine cells; Phthalimide derivatives; Sarcoma 180.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100313

Rigidity theorems of Clifford Torus
Provedor de dados: 42
Autores: SOUSA JR.,LUIZ A. M.
Let M be an n-dimensional closed minimally immersed hypersurface in the unit sphere Sn + 1. Assume in addition that M has constant scalar curvature or constant Gauss-Kronecker curvature. In this note we announce that if M has (n - 1) principal curvatures with the same sign everywhere, then M is isometric to a Clifford Torus &lt;img src="http:/img/fbpe/aabc/v73n3/03ab.gif" alt="03ab.gif (725 bytes)" align="middle"&gt;.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minimal hypersurfaces; Scalar curvature; Principal curvatures; Clifford Torus.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300003

Brazilian Scientific Mobility Program - Science without Borders - Preliminary Results and Perspectives
Provedor de dados: 42
Autores: MCMANUS,CONCEPTA; NOBRE,CARLOS A.
ABSTRACT The Brazilian Scientific Mobility Program - Science without Borders (SwB) - saw the concession of over 101 thousand scholarships for Brazilian STEM students and education professionals to attend universities worldwide. As the first phase of this program ends, it is time to take a first look at its impacts, mainly on the undergraduate student body (79% of total scholarships implemented). Benefits included a 6-month language course (optional), a one year undergraduate course and optional 2 month internship in a university, government laboratory or technology company. Positive impacts have been seen on entrance into post-graduate programs (&gt;20% of SwB students compared to &lt;5% of the overall student body of similar fields), as well as high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Innovation; Internationalization; Scholarships; Social impact; STEM areas.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200773

Ecological features of titica vine (Heteropsis flexuosa (Kunth) GS Bunting) in Rondônia State, Northwest Brazilian Amazon
Provedor de dados: 42
Autores: GAMA,MICHELLINY M. BENTES; VIEIRA,ABADIO H.; ROCHA,RODRIGO B.
The aim of this study was to characterize the forest structure with H. flexuosa in Rondônia State, as a first step in developing sustainable harvest and conservation guidelines for the species. Crown attributes, total height (m) and diameter at breast height ≥ 10 (cm) of trees and palms with H. flexuosa were evaluated in three permanent plots (100 m x 150 m each) randomized in 219 ha. A total of 22 botanical families hosted H. flexuosa. It was not observed any specific preference for the species standing up itself. Nevertheless it was frequently associated to Burseraceae, Leguminosae, Sapotaceae, Annonaceae, Chrysobalanaceae, Apocynaceae, Moraceae and Myristicaceae and species with thick bark like Schweilera coriacea, Protium sp. and Licania membranaceae....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Non-timber forest product; Ecology; Plant fibers; Habitat preference; Multiple-use forest management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301117

Ameliorative potential of Vernonia cinerea on chronic constriction injury of sciatic nerve induced neuropathic pain in rats
Provedor de dados: 42
Autores: THIAGARAJAN,VENKATA R.K.; SHANMUGAM,PALANICHAMY; KRISHNAN,UMA M.; MUTHURAMAN,ARUNACHALAM.
The aim of the present study is to investigate the ameliorative potential of ethanolic extract of whole plant of Vernonia cinerea in the chronic constriction injury (CCI) of sciatic nerve induced neuropathic pain in rats. Behavioral parameters such as a hot plate, acetone drop, paw pressure, Von Frey hair and tail immersion tests were performed to assess the degree of thermal, chemical and mechanical hyperalgesia and allodynia. Biochemical changes in sciatic nerve tissue were ruled out by estimating thiobarbituric acid reactive substances (TBARS), reduced glutathione (GSH) and total calcium levels. Ethanolic extract of Vernonia cinerea and pregabalin were administered for 14 consecutive days starting from the day of surgery. CCI of sciatic nerve has been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Calcium; Chronic constriction injury; Reduced glutathione; Thiobarbituric acid reactive substance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301435

The re-emergency and persistence of vaccine preventable diseases
Provedor de dados: 42
Autores: BORBA,RODRIGO C.N.; VIDAL,VINÍCIUS M.; MOREIRA,LILIAN O.
The introduction of vaccination worldwide dramatically reduced the incidence of pathogenic bacterial and viral diseases. Despite the highly successful vaccination strategies, the number of cases among vaccine preventable diseases has increased in the last decade and several of those diseases are still endemic in different countries. Here we discuss some epidemiological aspects and possible arguments that may explain why ancient diseases such as, measles, polio, pertussis, diphtheria and tuberculosis are still with us.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diphtheria; Measles; Pertussis; Polio; Tuberculosis; Vaccine.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301311

Thidiazuron (TDZ) increases fruit set and yield of ‘Hosui’ and ‘Packham’s Triumph’ pear trees
Provedor de dados: 42
Autores: PASA,MATEUS S.; SILVA,CARINA P. DA; CARRA,BRUNO; BRIGHENTI,ALBERTO F.; SOUZA,ANDRÉ LUIZ K. DE; PETRI,JOSÉ LUIZ.
ABSTRACT The low fruit set is one of the main factors leading to poor yield of pear orchards in Brazil. The exogenous application of thidiazuron (TDZ) and aminoethoxyvinilglycine (AVG) has shown promising results in some pear cultivars and other temperate fruit trees. The objective of this study was to evaluate the effect of TDZ and AVG on fruit set, yield, and fruit quality of ‘Hosui’ and ‘Packham’s Triumph’ pears. The study was performed in a commercial orchard located in São Joaquim, SC. Plant material consisted of ‘Hosui’ and ‘Packham’s Triumph’ pear trees grafted on Pyrus calleryana. Treatments consisted on different rates of TDZ (0 mg L-1, 20 mg L-1, 40 mg L-1 and 60 mg L-1) sprayed at full bloom for both cultivars. An additional treatment of AVG 60...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyrus sp.; Fruit drop; Plant growth regulators; Cytokinin; Fruit quality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603103

Diurnal versus nocturnal pollination success in Billbergia horrida Regel (Bromeliaceae) and the first record of chiropterophily for the genus
Provedor de dados: 42
Autores: MARQUES,JUÇARA S.; TAGLIATI,MARCELA C.; FARIA,ANA PAULA G.
Billbergia horrida is endemic of the Atlantic Forest fragments in southeastern Brazil and characterized by flowers with typical traits for pollination by nocturnal animals. Although the majority of Billbergia species rely on diurnal pollination by hummingbirds, B. horrida is also visited by bats and this study evidences for the first time the occurrence of chiropterophily within the genus. The role of different groups of pollinators on the reproductive success of B. horrida was evaluated, as well as the correlation of nectar features in sustaining these animals during different periods of the day. Bats contributed to 82.1% of fruit set of B. horrida. Hummingbirds, in turn, contributed to only 10% of fruit set, and were poorly related to the reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Atlantic Forest; Floral biology; Hummingbirds pollination; Reproductive success.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200835

A remark on soliton equation of mean curvature flow
Provedor de dados: 42
Autores: Ma,Li; Yang,Yang.
In this note, we consider self-similar immersions of the mean curvature flow and show that a graph solution of the soliton equation, provided it has bounded derivative, converges smoothly to a function which has some special properties (see Theorem 1.1).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soliton; Self-Similar; Mean curvature flow.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300001

Sample size for estimating mean and coefficient of variation in species of crotalarias
Provedor de dados: 42
Autores: TOEBE,MARCOS; MACHADO,LETÍCIA N.; TARTAGLIA,FRANCIELI L.; CARVALHO,JULIANA O. DE; BANDEIRA,CIRINEU T.; CARGNELUTTI FILHO,ALBERTO.
ABSTRACT The objective of this study was to determine the sample size necessary to estimate the mean and coefficient of variation in four species of crotalarias (C. juncea, C. spectabilis, C. breviflora and C. ochroleuca). An experiment was carried out for each species during the season 2014/15. At harvest, 1,000 pods of each species were randomly collected. In each pod were measured: mass of pod with and without seeds, length, width and height of pods, number and mass of seeds per pod, and mass of hundred seeds. Measures of central tendency, variability and distribution were calculated, and the normality was verified. The sample size necessary to estimate the mean and coefficient of variation with amplitudes of the confidence interval of 95% (ACI95%) of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria sp; Experimental precision; Number of pods; Resampling.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401705

Tropane alkaloids and calystegines as chemotaxonomic markers in the Solanaceae
Provedor de dados: 42
Autores: Pigatto,Aline G.S.; Blanco,Carolina C.; Mentz,Lilian A.; Soares,Geraldo L.G.
ABSTRACT This study assessed the occurrence and distribution of tropane alkaloids and calystegines in genera of the family Solanaceae to identify patterns of distribution and make evolutionary inferences. A database of tropane alkaloids and calystegines occurrences was constructed from the results of a search of scientific websites and a hand search of periodicals. The terms "Solanaceae", "tropane alkaloids", and "calystegines" were used as index terms for a full-text article search unrestricted by date of publications. The number of occurrence and chemical diversity indices were calculated and cluster analysis and principal components analysis were performed. Overall, 996 occurrences were reported, 879 of tropane alkaloids (88.3%) and 117 of calystegines...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical diversity; Number of occurrence; Geographic distribution; Multivariate analysis; Solanaceae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502139

Erratum to ''Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review''
Provedor de dados: 42
Autores: Soares,Rodrigo P.P.; Turco,Salvatore J.
Tipo: Info:eu-repo/semantics/article
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400004

Focal rigidity of flat tori
Provedor de dados: 42
Autores: Kwakkel,Ferry; Martens,Marco; Peixoto,Mauricio.
Given a closed Riemannian manifold (M, g), i.e. compact and boundaryless, there is a partition of its tangent bundle TM = ∪iΣi called the focal decomposition of TM. The sets Σi are closely associated to focusing of geodesics of (M, g), i.e. to the situation where there are exactly i geodesic arcs of the same length joining points p and q in M. In this note, we study the topological structure of the focal decomposition of a closed Riemannian manifold and its relation with the metric structure of the manifold. Our main result is that flat n-tori, n &gt; 2, are focally rigid in the sense that if two flat tori are focally equivalent then the tori are isometric up to rescaling. The case n = 2 was considered before by F. Kwakkel.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riemannian manifolds; Focal decomposition; Rigidity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400002

Mercury exposure of children living in Amazonian villages: influence of geographical location where they lived during prenatal and postnatal development
Provedor de dados: 42
Autores: FREITAS,JOYCE S.; LACERDA,ELIZA MARIA C.B.; RODRIGUES JÚNIOR,DARIO; CORVELO,TEREZA CRISTINA O.; SILVEIRA,LUIZ CARLOS L.; PINHEIRO,MARIA DA CONCEIÇÃO N.; SOUZA,GIVAGO S.
Abstract: Introduction: In some Amazonian river basins, hair mercury concentration is above the recommended levels. We evaluated the influence of birth geographical location in the hair mercury level of Amazonian riverine children. Materials and Methods: Hair mercury concentration was measured in 219 children living in four Amazonian riverine communities: Tapajós River (São Luiz do Tapajós and Barreiras villages, n = 110), Tocantins River (Limoeiro do Ajurú village, n = 61), and Caeté River (Caratateua village, n = 48). We used Poisson regression analysis to evaluate the association between native and non-native children from each village and its hair mercury concentration. Results: Higher mercury exposure was found in native children from São Luiz do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Children development; Mercury exposure; Tapajós River basin; Tocantins River basin; Caeté River basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200402

Chaco ansilta new species from Mendoza province, Western Argentina (Araneae: Nemesiidae)
Provedor de dados: 42
Autores: FERRETTI,NELSON.
A new species of Chaco Tullgren, 1905 is described and illustrated from the Andean foothills of Mendoza province, western Argentina. This is the tenth species of the genus and the first record of Chaco in Mendoza. An updated key is presented for all Chaco species. The cladistic analysis based on a previously published morphological character matrix resulted in the consensus tree: (C. obscura, C. tucumana, C. castanea, (C. socos + C. tigre) (C. tecka (C. sanjuanina (C. Patagonia + C. ansilta sp. nov.)))).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andean foothills; Cladistics; Mygalomorph; Nemesiid; Spider taxonomy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401887

Morphological variation among the appendicular bones of the Titanosauridae (Dinosauria: Sauropoda) from the Bauru Basin (upper Cretaceous) of Peirópolis (MG), Brazil
Provedor de dados: 42
Autores: TROTTA,MARCELO N.F.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200020

Solid-phase extractions in flow analysis
Provedor de dados: 42
Autores: ROCHA,FÁBIO R.P.; BATISTA,ALEX D.; MELCHERT,WANESSA R.; ZAGATTO,ELIAS A.G.
ABSTRACT Coupling solid-phase extraction (SPE) to flow systems has promoted a synergistic development. Whereas SPE mechanization leads to improved precision and higher sample throughput, as well as diminishes systematic errors and contamination risks, analyte concentration and separation from the sample matrix provides a remarkable impact on detectability and selectivity in flow analysis. Historical aspects, main cornerstones, tips for system design, and recent applications are critically reviewed, in the context of analyte(s) separation/concentration, sample clean-up, and release of sorbed chemical species involving both packed (e.g. mini-columns, cartridges, and disks) or fluidized (e.g. beads and magnetic materials) particles. Novel (bio)sorbents,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beads; Flow analysis; In-line analyte concentration; In-line sample treatment; Sample clean-up; Solid-phase extraction.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200803

Coastline changes and sedimentation related with the opening of an artificial channel: the Valo Grande Delta, SE Brazil
Provedor de dados: 42
Autores: MAHIQUES,MICHEL M. DE; FIGUEIRA,RUBENS C.L.; ALVES,DANIEL P.V.; ITALIANI,DIANA M.; MARTINS,CRISTINA C.; DIAS,JOÃO M.A.
The role played by human activity in coastline changes indicates a general tendency of retreating coasts, especially deltaic environments, as a result of the recent trend of sea level rise as well as the blockage of the transfer of sediments towards the coast, especially due to the construction of dams. This is particularly important in deltaic environments which have been suffering a dramatic loss of area in the last decades. In contrast, in this paper, we report the origin and evolution of an anthropogenic delta, the Valo Grande delta, on the south-eastern Brazilian coast, whose origin is related to the opening of an artificial channel and the diversion of the main flow of the Ribeira de Iguape River. The methodology included the analysis of coastline...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthropic activity; Delta; Sedimentation; Lagoon.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401597

Reproductive phenology in a riparian rainforest in the south of Santa Catarina state, Brazil
Provedor de dados: 42
Autores: CASCAES,MAINARA F.; CITADINI-ZANETTE,VANILDE; HARTER-MARQUES,BIRGIT.
Phenological studies assist in forest ecosystems comprehension and evaluation of resource availability for wildlife, as well as in improving the understanding of relationships between plants and their pollinators and dispersers. This study aims to describe the reproductive phenophases of riparian plant species and correlate them with climatic variables. The reproductive phenology was analyzed biweekly throughout one year, recording the absence or presence of flowers/fruits. The flowering phenophase occurred throughout the year, with an increase in number of species in blossom in October, November, and December. The flowering peak of the community was observed in November. The fruiting phenophase also occurred throughout the year and showed an increase of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flowering; Fruiting; Riparian forest; Climatic variables.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401449

Does the environment constrain avian sound localization?
Provedor de dados: 42
Autores: Larsen,Ole N.
A bird needs to keep track not only of social interactions of conspecifics but also of their changing locations in space by determining their directions and distances. Current knowledge of accuracy in the computation of sound source location by birds is still insufficient, partly because physiological mechanisms of few species are studied in well defined laboratory settings, while field studies are performed in a variety of species and complex environments. Velocity gradients and reverberating surfaces may conceivably induce inaccuracy in sound source location (mainly elevation) by distorting the directional cues. However, most birds possess an inherently directional pressure difference receiver, which enhances the directional cues (mainly azimuth), and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Directional hearing; Elevation; Azimuth angle; Precedence effect.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200013

Advances in enzyme bioelectrochemistry
Provedor de dados: 42
Autores: PEREIRA,ANDRESSA R.; SEDENHO,GRAZIELA C.; SOUZA,JOÃO C. P. DE; CRESPILHO,FRANK N.
ABSTRACT Bioelectrochemistry can be defined as a branch of Chemical Science concerned with electron-proton transfer and transport involving biomolecules, as well as electrode reactions of redox enzymes. The bioelectrochemical reactions and system have direct impact in biotechnological development, in medical devices designing, in the behavior of DNA-protein complexes, in green-energy and bioenergy concepts, and make it possible an understanding of metabolism of all living organisms (e.g. humans) where biomolecules are integral to health and proper functioning. In the last years, many researchers have dedicated itself to study different redox enzymes by using electrochemistry, aiming to understand their mechanisms and to develop promising bioanodes and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioelectrocatalysis; Biofuel cells; Bioelectrochemistry; Immobilization; Protein-electrode interactions; Redox enzymes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200825

Validation of a protocol to evaluate maximal expiratory pressure using a pressure transducer and a signal conditioner
Provedor de dados: 42
Autores: Soares,Viviane; Rodrigues,Fábio B.; Vieira,Marcus F.; Silva,Maria Sebastiana.
The respiratory muscles can present fatigue and even chronic inability to generate force. So, reliable devices are necessary to their evaluation. The aim of this study is to evaluate the MEP (Maximal Expiratory Pressure) values of individuals between 20 and 25 years old and to validate a protocol using a pressure transducer and a signal conditioner comparing it with the digital manometer. We evaluated the MEP of 10 participants. They remained seated and made six respiratory maneuvers from Total Lung Capacity (TLC) to Residual Volume (RV). The results in the study showed no statistically significant differences when compared to values reported in the literature, and that the pressure transducer provides reliable values for MEP.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaluation and validation; Respiratory muscle strength; Maximal Expiratory Pressure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300015

Pharmacognostical study of Desmodium caudatum
Provedor de dados: 42
Autores: LI,JUNNI; LIN,XIAOJING; TANG,GENGQIU; LI,RONG; WANG,DONG; JI,SHENGGUO.
Abstract: De﻿﻿smodium caudatum (Thunb.) DC, is an ever-green plant widely used in the central and southern China with great economic value for their medical values on fever, dysentery, gastroenteritis, rectal prolapse, snake bites, mastitis, and boils carbuncle. Despite its extensive uses as a traditional Chinese medicine, no systematic research on the identification of Desmodium caudatum ha﻿s been reported. In﻿ this study, tr﻿﻿aditional ph﻿﻿﻿armacognostical identification including th﻿e bo﻿﻿﻿﻿tanical origin and morphological characters, medicinal material characters, microscopic characters, physicochemical parameters determination and phytochemical screening, and DNA barcoding analysis were employed to establish an accurate and effective identification...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desmodium caudatum; DNA barcoding; Quality standardization; Traditional pharmacognostical identification.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300709

Alzheimer's disease, the potential use of a bacterium in rice production, and the paleochannels of the Marajó Island
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300001

Oil collecting bees and Byrsonima cydoniifolia A. Juss. (Malpighiaceae) interactions: the prevalence of long-distance cross pollination driving reproductive success
Provedor de dados: 42
Autores: SAZAN,MORGANA S.; BEZERRA,ANTONIO DIEGO M.; FREITAS,BRENO M.
Oil-collecting bees are the natural pollinators of oil-flower plants, but little is known about the pollination process and the effectiveness of their pollination service to the reproductive success of their host plants. In species of Byrsonima the reproductive system have been described as auto-compatible or self-incompatible. We studied the reproductive system ofByrsonima cydoniifolia, the fructification by means of short, medium and long-distance cross pollinations, the morphology and floral biology and the pollination interactions with species of oil-collecting bees. By means of controlled pollinations we found self-incompatibility caused by abortion of most self-pollinated flowers and demonstrated that the prevailing cross pollination ensuring the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centridini; Epicharis nigrita; Oil flowers; Pollinators; Self-incompatibility.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100347

Influence of NO2 and metal ions on oxidation of aqueous-phase S(IV) in atmospheric concentrations
Provedor de dados: 42
Autores: Martins,Cláudia R.; Alves,Janete J.F.; Carvalho,Wanessa B.D.; Cardoso,Cristiane S.C.; Andrade,Jailson B. de.
An investigation was made of the influence of atmospheric concentrations (15 or 130 ppbv) of NO2 on the aqueous-phase oxidation rate of S(IV) in the presence and absence of Fe(III), Mn(II) and Cr(VI) metal ions under controlled experimental conditions (pH, T, concentration of reactants, etc.). The reaction rate in the presence of the NO2 flow was slower than the reaction rate using only clean air with an initial S(IV) concentration of 10-4 mol/L. NO2 appears to react with S(IV), producing a kind of inhibitor that slows down the reaction. Conversely, tenfold lower concentrations of S(IV) ([S(IV)]º = 10-5 mol/L) caused a faster reaction in the presence of NO2 than the reaction using purified air. Under these conditions, therefore, the equilibrium shifts to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous S(IV) oxidation; Metal ions; NO2; Acid rain formation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200006

Fast environmental impact assessment through ICP-MS: application to bivalves from a tropical estuary (Pina Bay, Recife, Brazil)
Provedor de dados: 42
Autores: LIMA,EDMILSON S.; COSTA,MONICA F.; PASTOR,AGUSTIN; DE-LA-GUARDIA,MIGUEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300045

Halophila baillonis Ascherson: first population dynamics data for the Southern Hemisphere
Provedor de dados: 42
Autores: Magalhães,Karine M.; Borges,João C.G.; Pitanga,Maria E.
The present paper presents the first population data for the Southern Hemisphere of the rare seagrass Halophila baillonis. The population studied is located in a calm, reef-protected area at depths ≤ 5 m, covering 12,000 m2 (400 m long by 30 m wide, oriented parallel to the coastline). The population generally demonstrated low shoot density and biomass during the rainy season, with significant differences between seasons, being found only for aboveground biomass. Despite the identification of this new population, the species continues to be considered rare along the Brazilian coast.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vulnerable species; New population; Seagrass; Shoot density.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200861

Fertility and acidity status of latossolos (oxisols) under pasture in the Brazilian Cerrado
Provedor de dados: 42
Autores: Vendrame,Pedro R.S.; Brito,Osmar R.; Guimarães,Maria F.; Martins,Éder S.; Becquer,Thierry.
The Cerrado region, with over 50 million hectares of cultivated pasture, provides 55% of Brazilian beef production. Previous investigations have shown that about 70-80% of this pasture is affected by some kind of degradation, leading to low productivity. However, until now, few surveys have been carried out on a regional scale. The aim of the present work is both to assess the fertility and acidity levels of Cerrado soils under pasture and compare the variability of the soils characteristics on a regional scale. Two soil depths were sampled in different places within the studied area: (1) a surface horizon (0.0-0.2 m) in order to evaluate its fertility and acidity status for pasture, and (2) a subsurface horizon (0.6-0.8 m), used for classification. Most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cation exchange capacity; Exchangeable aluminum; Phosphorus availability; Soil degradation; Total carbon.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400026

Studies on the Synthesis of Vitamin D Analogs with Aromatic D-Ring
Provedor de dados: 42
Autores: EDUARDO-CANOSA,SILVINA; SIGÜEIRO,MARÍA MARCO, RITA; MOURIÑO,ANTONIO.
ABSTRACT Herein, we describe our studies on the synthesis of 1α,25-dihydroxyvitamin D3 analogs possessing a benzene ring replacing the natural 5-membered D-ring by the Wittig-Horner and dienyne approaches. A key feature is the synthesis of a Cr(CO)3-complexed previtamin D derivative that enables the construction of vitamin D analogs with aromatic D-ring through a thermal [1,7]-H sigmatropic shift. This study establishes the basis for the design of new vitamin D analogs containing aromatic D-ring, complexed or uncomplexed to Cr(CO)3 type moieties for specific molecular recognition and drug research and development.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: D-ring modified vitamin D analogs; Aryl-Cr(CO)3 complexes; Cancer; Sigmatropic rearrangements; Synthesis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301035

Soil temperature profiles for locating wells in the semi-arid region - technical viability, procedures and equipment
Provedor de dados: 42
Autores: DEMETRIO,JOSÉ G. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300032

Isolation, characterization and evaluation of antimicrobial and cytotoxic activity of estragole, obtained from the essential oil of croton zehntneri (euphorbiaceae)
Provedor de dados: 42
Autores: ANDRADE,THALLITA C.B.; LIMA,SIDNEY G. DE; FREITAS,RIVELILSON M.; ROCHA,MÁRCIO S.; ISLAM,TOREQUL; SILVA,TERESINHA G. DA; MILITÃO,GARDENIA C.G.
Croton zehntneri (Euphorbiaceae) is a native aromatic plant from Northeast region of Brazil. The monoterpenoid estragole (ESL) has been isolated by classical chromatographic methods from the essential oil (EO) of C. zehnteneri leaves and characterized by GC-FID and GC-MS, its antimicrobial and cytotoxic potentials being assessed. The analysis of the EO enabled the identification of 100% of the integrated constituents, of which yield was about 1.8%. The main components identified were: eucalyptol, estragole (84.7%) and spathulenol. The dosage of 50 μg/disk of ESL presented fairly significant zones of inhibition against Gram-positive bacteria and fungi. The ESL presented toxicity against Artemia salina with LC50 and LC90 of 4,54 and 8,47 μg mL-1. However, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial; Croton zehntneri; Cytotoxic; Estragole.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100173

Geographical information system applied to public health
Provedor de dados: 42
Autores: SOUZA,WAYNER V.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300030

Antioxidant potential and cytotoxic activity of two red seaweed species, Amansia multifida and Meristiella echinocarpa, from the coast of Northeastern Brazil
Provedor de dados: 42
Autores: ALENCAR,DANIEL B. DE; SILVA,SUZETE R. DA; PIRES-CAVALCANTE,KELMA M.S.; LIMA,REBECA L. DE; PEREIRA JÚNIOR,FRANCISCO N.; SOUSA,MÁRCIA B. DE; VIANA,FRANCISCO A.; NAGANO,CELSO S.; NASCIMENTO,KYRIA S. DO; CAVADA,BENILDO S.; SAMPAIO,ALEXANDRE H.; SAKER-SAMPAIO,SILVANA.
Natural antioxidants found in marine macroalgae are bioactive compounds known to play an important role in the prevention of diseases associated with aging cells protecting them against the oxidative damage. The purpose of this study was to evaluate the antioxidant and cytotoxic activity of ethanolic extracts of two species of red seaweeds, Amansia multifida and Meristiella echinocarpa. In vitro antioxidant activity was determined by DPPH radical scavenging assay, ferric-reducing antioxidant power (FRAP) assay, ferrous ion chelating (FIC) assay, β-carotene bleaching (BCB) assay and total phenolic content (TPC) quantification. Cytotoxicity was evaluated with the brine shrimp Artemia sp. lethality test. The TPC values observed in the present study indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Bioactive compounds; Cytotoxic; Phenolic compounds; Rhodophyta.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100251

Herman Lent, scientist and citizen - II
Provedor de dados: 42
Autores: Jurberg,José.
Tipo: Info:eu-repo/semantics/article
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300003

A new analytical formulation of retention effects on particle diffusion processes
Provedor de dados: 42
Autores: Bevilacqua,Luiz; Galeão,Augusto C.N.R.; Costa,Flavio P.
The ultimate purpose of this paper is to present a new analytical formulation to simulate diffusion with retention in a reactive medium under stable thermodynamic conditions. The analysis of diffusion with retention in a continuum medium is developed after the solution of an equivalent problem using a discrete approach. The new law may be interpreted as the reduction of all diffusion processes with retention to a unifying phenomenon that can adequately simulate the retention effect namely a circulatory motion. It is remarkable that the governing equation requires a fourth order differential term as suggested by the discrete approach. The relative fraction of diffusion particles β is introduced as a control parameter in the diffusion-retention law as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffusion; Retention; Constitutive law; Discrete approach; Population dynamics; Fourth order differential equations.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400031

Uniqueness Properties of The Solution of The Inverse Problem for The Sturm-Liouville Equation With Discontinuous Leading Coefficient
Provedor de dados: 42
Autores: ADILOGLU,ANAR; GÜRDAL,MEHMET; KINCI,AYŞE N.
Abstract The present paper studies uniqueness properties of the solution of the inverse problem for the Sturm-Liouville equation with discontinuous leading coefficient and the separated boundary conditions. It is proved that the considered boundary-value is uniquely reconstructed, i.e. the potential function of the equation and the constants in the boundary conditions are uniquely determined by given Weyl function or by the given spectral data.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymptotic formulas for eigenvalues; Boundary value problems; Inverse problems; Spectral; Analysis of ordinary differential operators; Sturm-Liouville theory; Transformation operator.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602547

Comparison of the human immune responses to recombinant proteins representing three distinct surface proteins of Plasmodium vivax merozoites
Provedor de dados: 42
Autores: Cunha,Maristela Gomes da; Galinski,Mary R.; Soares,Irene S.; Souza,José Maria de; Oliveira,Salma G.; Braga,Érika; Barnwell,John W.; Rodrigues,Maurício M.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100016

Occurrence of annual growth rings in Rhizophora mangle in a region with low climate seasonality
Provedor de dados: 42
Autores: SOUZA,BRUNNA T.; ESTRADA,GUSTAVO C.D.; SOARES,MÁRIO L.G.; CALLADO,CÁTIA H.
ABSTRACT The formation of annual growth rings has been confirmed for several mangrove species in the last decade, among which is the Rhizophora mangle. However, the record of annual rings for this species was made in a region with high hydric seasonality, a widely recognized induction factor of annual rings in tropical species. In this sense, the present study aimed to verify the occurrence of annual growth rings in R. mangle in the mangroves of Guaratiba (Rio de Janeiro, Southeastern Brazil), a region with low hydric seasonality. For this purpose, the crossdating technique was applied in ten trees collected with known age (seven years). The growth rings are characterized by alternating layers of low vessel density (earlywood) and high vessel density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth rings; Dendrochronology; Mangrove; Dendroecology; Proxy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200517

Can insect assemblages tell us something about the urban environment health?
Provedor de dados: 42
Autores: VALENTE-GAIESKY,VERA LÚCIA DA SILVA.
Abstract Abstract: If we consider Drosophilidae, the answer to the question above is yes. Many research groups in Brazil and abroad have been showing that assemblages of flies of this family can reflect environmental alteration levels caused by urbanization, and/or by other human disturbances. I will present here a summary of our findings in Drosophilidae assemblages reflecting different degrees of environmental perturbation. These studies were done by graduate students of two post graduate programs of UFRGS, under my supervision, along several decades. I will also present the results stemming from the effort of other Brazilian Drosophilid study groups while identifying the members of those assemblages in different Biomes. As a result of those field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindication; Brazilian Biomes; Drosophilidae; Urbanization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600606

Growth, Yield and Grain Nutritional Quality in Three Brazilian Pearl Millets (Pennisetum americanum L.) with African or Indian origins
Provedor de dados: 42
Autores: MEDICI,LEONARDO O.; GONÇALVES,FABÍOLA V.; FONSECA,MARCOS PAULO S. DA; GAZIOLA,SALETE A.; SCHMIDT,DAIANA; AZEVEDO,RICARDO A.; PIMENTEL,CARLOS.
ABSTRACT In this study, we are presenting recommendations to the best agricultural use as well as for plant breeding of three millet cultivars namely ENA1 and ENA2, which have African origin, and BRS1501 originally from India. These cultivars were evaluated for growth, yield and grain quality traits. The morphological traits evaluated in this study indicated that the African genotypes ENA1 and ENA2 are better than the Indian genotype BRS1501 for no-till farming or to produce forage with 15% of crude protein at flowering and at harvest to produce stover (around 7% of crude protein content) for livestock feeding. The BRS1501 cultivar exhibited the highest values for total crude protein, albumins and prolamins, phytate and mineral contents in grains. ENA1 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral density; SDS-PAGE; Phytate; Seed storage proteins; Amino acids.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401749

Formulation and in vitro evaluation of carbopol 934-based modified clotrimazole gel for topical application
Provedor de dados: 42
Autores: UBAID,MUHAMMAD; ILYAS,SADAF; MIR,SADULLAH; KHAN,ABIDA K.; RASHID,REHANA; KHAN,MUHAMMAD Z.U.; KANWAL,ZAINAB G.; NAWAZ,AHMAD; SHAH,AMNA; MURTAZA,GHULAM.
ABSTRACT The aim of present study was to enhance topical permeation of clotrimazole gel preparation by using various permeability enhancers such as coconut oil, pistachio oil and sodium lauryl sulphate (SLS). Clotrimazole gel preparations were prepared and optimized by using three factor, five level central composite design. A second-order polynomial equation was generated in order to estimate the effect of independent variables i.e. coconut oil (X1), pistachio oil (X2) and sodium lauryl sulphate (X3) at various dependent variables i.e. flux (Y1), lag time (Y2), diffusion coefficient (Y3), permeability coefficient (Y4), and input rate (Y5) of clotrimazole gel formulations. Ex vivo skin permeation study was performed through rat skin by using modified Franz...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Central composite design; Clotrimazole; Permeability enhancer; Topical gel.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602303

Luminescence characteristics of quartz from Brazilian sediments and constraints for OSL dating
Provedor de dados: 42
Autores: GUEDES,CARLOS C.F.; SAWAKUCHI,ANDRé O.; GIANNINI,PAULO C.F.; DEWITT,REGINA; AGUIAR,VITOR A.P.
This study analyzes the optically stimulated luminescence (OSL) characteristics of quartz grains from fluvial, eolian and shallow marine sands of northeastern and southeastern Brazil, with especial focus on the applicability of the single-aliquot regenerative dose (SAR) dating protocol. All analyzed Brazilian sediments presented relatively high OSL sensitivity and good behavior regarding their luminescence characteristics relevant for radiation dose estimation. However, some samples from the Lençóis Maranhenses region in northeastern Brazil showed inadequate OSL sensitivity correction, hampering the implementation of the SAR protocol and their ability to behave as a natural dosimeter. While the shallow marine and eolian samples showed a narrow and reliable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Optically stimulated luminescence (OSL) dating; Single-Aliquot Regenerative-Dose protocol (SAR); OSL sensitivity; Brazilian sands.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401303

Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém - Brazil
Provedor de dados: 42
Autores: Krymsky,Robert S.; Macambira,Moacir J.B.; Lafon,Jean-Michel; Estumano,Gérson S.
Analytical procedures for U-Pb isotope dilution analyses at the Pará-Iso isotope geology laboratory of the Federal University of Pará (UFPA) are described in detail. The procedures are applied to zircon, titanite, rutile, apatite, columbite-tantalite and whole rock. Reagent preparation and chemical processing are done in clean-room conditions. Samples are dissolved using TeflonTM microcapsules in steel jacket TeflonTM Parr InstrumentTM bomb or TeflonTM screw cap containers. U and Pb are separated using anion exchange AG 1x8 resin columns. Typical blanks for mineral sample amounts of 0.01 to 1.0 mg are less than 1 pg U and 20-30 pg Pb. Isotope analysis of the U and Pb from the same filament are carried out using a Finnigan MAT 262 mass-spectrometer in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: U-Pb dating; Zircon; Accessory mineral; Isotope dilution.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100014

High prevalence of unusual genotypes of Toxoplasma gondii infection in pork meat samples from Erechim, Southern Brazil
Provedor de dados: 42
Autores: Belfort,RN; Nussenblatt,Veronique; Rizzo,Luiz; Muccioli,Cristina; Silveira,Claudio; Nussenblatt,Robert; Khan,Assis; Sibley,L. David; Belfort-Jr.,Rubens.
Toxoplasmosis is the most common cause of infectious uveitis in Brazil, with a higher frequency in the South of the country. We have collected samples from porcine tongue and diaphragm obtained in both large and small abattoirs and used molecular biological technique to determine the prevalence of infection and RFLP analysis to type the parasites. Seventeen out of 50 (34%) samples from the diaphragm and 33 out of 50 (66%) samples from the tongue demonstrated a positive PCR reaction for T. gondii and restriction analysis of four of the positive samples revealed that all had a type I genotype at SAG2. However, when other unlinked loci were analyzed, these strains had a type III genotype at markers BTUB, SAG3, and GRA6. One of the strains (8T) had a type II...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ocular toxoplasmosis; Toxoplasma gondii; Genotypes.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100013

Positively curved 6-manifolds with simple symmetry groups
Provedor de dados: 42
Autores: FANG,FUQUAN.
Let M be a simply connected compact 6-manifold of positive sectional curvature. If the identity component of the isometry group contains a simple Lie subgroup, we prove that M is diffeomorphic to one of the five manifolds listed in Theorem A.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 6-manifolds; Positive curvature; Symmetry groups.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400004

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil
Provedor de dados: 42
Autores: Chiglino,Leticia; Gaucher,Claudio; Sial,Alcides N.; Ferreira,Valderez P.
We report for the first time the occurrence of organic-walled microfossils in Ediacaran limestones and marls of the Frecheirinha Formation, Ubajara Group, and the first Precambrian acritarchs so far reported for northeastern Brazil. The assemblage of the Frecheirinha Formation represents a low-diversity microflora comprising Leiosphaeridia, Lophosphaeridium and subordinated Bavlinella (=Sphaerocongregus). Their thermal alteration index (TAI) between 4+ and 5, suggests metamorphic temperatures exceeding 200-250°C. Higher temperatures are probably related to intruding granitic plutons (Meruoca, Mucambo). Reported δ13C values of carbonates of -3.5 ‰ VPDB (Vienna-Peedee Belemnite) at the base, passing up section into a positive plateau of up to +3.7 ‰, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acritarchs; Ediacaran; Neoproterozoic; Northeastern Brazil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200635

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions
Provedor de dados: 42
Autores: Lamarca,Edmir V.; Prataviera,Juliana S.; Borges,Igor F.; Delgado,Liliana F.; Teixeira,Carmen C.; Camargo,Marcelo B.P. de; Faria,José M.R.; Barbedo,Claudio J.
This study aims to analyze the maturation and dispersal of Eugenia pyriformis Cambess. seeds produced in different years, and the influence of variation in thermal and hydric environment on seed physical and physiological characteristics at dispersal. Fruits at different developmental stages were harvested in the city of São Paulo between 2003 and 2010, as well as in the cities of Campinas and Lavras, in 2009 and 2010 and analyzed for size and color. The seeds were extracted from the fruits and their dry mass, water content, germination and vigor were assessed. Results showed that seed maturation is unsynchronized to the maturation of the fruit, taking 45 days on average (430 growing degree-days), longer in rainy times or lower temperatures. Seeds with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersal; Development; Degree-day; Rainfall; Recalcitrants seeds.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100223

Flow-by-flow chemical stratigraphy and evolution of thirteen Serra Geral Group basalt flows from Vista Alegre, southernmost Brazil
Provedor de dados: 42
Autores: Pinto,Viter M; Hartmann,Léo A.
The geochemical characterization of thirteen Serra Geral Group flows in the Vista Alegre region (RS-SC), southern Brazil, displays the homogeneous basaltic composition near 50 wt.% SiO2. Each of the five basal flows (Pitanga-type, high-Ti/Y ~600, TiO2 &gt; 3 wt.%) and eight upper flows (Paranapanema-type, medium Ti/Y ~400, TiO2 &gt; 2 wt.%) can be identified from their chemical composition; sets of flows have parallel variation in chemical composition. The flow-by-flowcorrelation in four sections shows the horizontal position of the flows in three profiles and an approximately 200-m downdrop of the Itapiranga block with respect to the Frederico Westphalen block. The world-class amethyst geode mineralization and the systematic presence of native copper in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochemical correlation; Basalt; Stratigraphy; Serra Geral Group; Vista Alegre.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200006

High-resolution topography for Digital Terrain Model (DTM) in Keller Peninsula, Maritime Antarctica
Provedor de dados: 42
Autores: SCHÜNEMANN,ADRIANO L.; ALMEIDA,PEDRO HENRIQUE A.; THOMAZINI,ANDRÉ; FERNANDES FILHO,ELPÍDIO I.; FRANCELINO,MÁRCIO R.; SCHAEFER,CARLOS E.G.R.; PEREIRA,ANTONIO BATISTA.
Abstract High resolution topography (HRT) surveys is an important tool to model landscapes, especially in zones subjected to strong environmental changes, such as Antarctica, where landform is highly influenced by cryoclasty and permafrost melting. The aim of this work was to obtain a high accurate DTM for Keller Peninsula, Maritime Antarctica. The survey study was assessed in the 2014/2015 and 2015/2016 during the austral summer, by using Terrestrial Laser Scanner (TLS). In order to cover 8 km² of the Peninsula, the TLS equipment was installed in 81 different points. Results of the DTM generated by TLS (hereafter, HRT-DTM), and the terrain variables Aspect, Slope and Hillshade obtained were compared with previous models generated by aerophotographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Terrestrial laser scanner; Remote sensing; Geomorphology; Antarctic.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502001

New Palladacycle-Derived Acylhydrazones as Pre-catalysts in Mirozoki-Heck Coupling and Oxyarylations
Provedor de dados: 42
Autores: LEÃO,RAQUEL A.C.; PINHO,VAGNER D.; COELHO,ARTUR S.; KÜMMERLE,ARTHUR E.; COSTA,PAULO R.R.
ABSTRACT New acylhydrazone-based palladacycles are prepared and evaluated as pre-catalysts in Mirozoki-Heck and oxyarylation reactions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acylhydrazone; Palladacycle; Mirozoki-Heck reaction; Oxyarylation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301273

Quaternary evolution of the Caravelas strandplain - Southern Bahia State - Brazil
Provedor de dados: 42
Autores: Andrade,Ana C.S.; Dominguez,José M.L.; Martin,Louis; Bittencourt,Abílio C.S.P.
An evolutionary model is proposed for the Caravelas strandplain. The model encompasses integration of: (i) mapping of Quaternary deposits, (ii) cartography of beach-ridge alignments and their truncations, (iii) relative sea-level history, (iv) development history of the Abrolhos coral reefs, (v) vibra-coring and (vi) C14 dating of Quaternary deposits. Seven major evolutionary stages were identified. These stages show that the strandplain has had its Quaternary evolution strongly controlled by relative sea-level changes. In addition, the development of the Abrolhos coral reefs has also played an important role in dispersion and accumulation of sediments along the coastline, causing localized inversion in longshore sediment transport.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal evolution; Sea-level fluctuations; Sedimentary facies; Geomorphology.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300008

Photosynthetic metabolism and quality of Eugenia pyriformis Cambess. seedlings on substrate function and water levels
Provedor de dados: 42
Autores: SCALON,SILVANA P.Q.; JEROMINI,TATIANE S.; MUSSURY,ROSILDA M.; DRESCH,DAIANE M.
The aim of this research was to evaluate the quality and photosynthetic metabolism of “uvaia” seedlings (Eugenia pyriformis Cambess.) on different substrates and water regimes. The seeds were sown in tubes of 50 x 190 mm in the following substrates: Sand (S), Latosol + Sand (L + S) (1:1), Latosol + Sand + Semi Decomposed Poultry Litter (L + S1 + PL) ( 1:1:0.5), Latosol + Sand + Semi Decomposed Poultry Litter (L + S2 + PL) (1:2:0.5), Latosol + Bioplant® (L + B) (1:1), and the water levels assessed were 50, 75 and 100% of water retention capacity. At 60, 90, 120 and 150 days the seedlings were evaluated according to their chlorophyll index, leaf area (cm2) and Dickson Quality Index (DQI) and at 150 days their internal concentration of carbon (mol m–2s–1),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Myrtaceae; Seedling production; Uvaia.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402039

40Ar/39Ar ages (600-570 Ma) of the Serra do Azeite transtensional shear zone: evidence for syncontractional extension in the Cajati area, southern Ribeira belt
Provedor de dados: 42
Autores: Machado,Rômulo; Dehler,Nolan M.; Vasconcelos,Paulo.
This paper presents 40Ar/39Ar ages of the rocks from the Serra do Azeite transtensional shear zone in the southern part of the Ribeira belt, between the States of São Paulo and Paraná, and also discusses the regional correlations and the tectonic implications for other parts of the belt. The geochronological data suggest that transtensional deformation was active between 600 and 580 Ma (hornblende and muscovite apparent ages, respectively). This time span is considerably older than previous proposals for the period of activity of these structures (520-480 Ma) in the northern segment of this belt and in the Araçuaí belt. Kinematic analysis of the dated mylonites shows extensional structures with top-down movement to ESE compatible with structures found in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Syncontractional extension; 40Ar/39Ar ages; Ribeira belt.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400011

Growth of the silverside Atherinella brasiliensis in a subtropical estuary with some insights concerning the weight-length relationship
Provedor de dados: 42
Autores: CARVALHO,BARBARA M. DE; BARRADAS,JOSÉ RICARDO S.; FONTOURA,NELSON F.; SPACH,HENRY L.
ABSTRACT Specimens of Brazilian silverside (Atherinella brasiliensis, n=9672) with a length range of 1.5 to 14.2 cm were captured in the intertidal areas of the Estuarine Complex of Paranaguá, Brazil, between August 2010 and July 2011. The species’ weight-length relationship was represented by the equation W=0.00533 L3.136 with a slightly positive allometry (b&gt;3) and could be divided into two growth stanzas: W = W1 + W2; Stanza 1: W1= SW. (0.005239 L3.152); Stanza 2: W2= (1 - SW). (0.000699 L3.913); Switch-Function: SW = [1 + e1.204 (L - 11.66)]-1. The breakpoint between the first and second stanza (11.66 cm) matches published values for the estimated size at first maturity of adult females. Frequency distributions indicate that the species is present...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atherinopsidae; Longevity; Von Bertalanffy; Weight-length relationship.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502261

Antimutagenic and antirecombinagenic activities of noni fruit juice in somatic cells of Drosophila melanogaster
Provedor de dados: 42
Autores: FRANCHI,LEONARDO P.; GUIMARAES,NILZA N.; ANDRADE,LAISE R. DE; ANDRADE,HELOISA H.R. DE; LEHMANN,MAURICIO; DIHL,RAFAEL R.; CUNHA,KENYA S.
Noni, a Hawaiian name for the fruit of Morinda citrifolia L., is a traditional medicinal plant from Polynesia widely used for the treatment of many diseases including arthritis, diabetes, asthma, hypertension and cancer. Here, a commercial noni juice (TNJ) was evaluated for its protective activities against the lesions induced by mitomycin C (MMC) and doxorrubicin (DXR) using the Somatic Mutation and Recombination Test (SMART) in Drosophila melanogaster. Three-day-old larvae, trans-heterozygous for two genetic markers (mwh and flr3      ), were co-treated with TNJ plus MMC or DXR. We have observed a reduction in genotoxic effects of MMC and DXR caused by the juice. TNJ provoked a marked decrease in all kinds of MMC- and DXR-induced mutant spots, mainly due...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antigenotoxicity; Doxorrubicin; Mitomycin C; SMART; Noni juice.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200585

Influence of temperature and nutrient content on lipid production in freshwater microalgae cultures
Provedor de dados: 42
Autores: BOHNENBERGER,JULIANA E.; CROSSETTI,LUCIANE O.
The production of biomass by microalgae is considered a clean alternative compared to other plant crops that require large areas for cultivation and that generate environmental impacts. This study evaluated the influence of temperature and nutrients on lipid contents of cultured species of freshwater microalgae, with a view toward using these lipids for biodiesel production. Two strains of Monoraphidium contortum, a culture containing Chlorella vulgaris and Desmodesmus quadricauda and another strain of Microcystis aeruginosa were maintained in the laboratory for six days, in five culture media: modified ASM-1 (control, with high concentrations of phosphate and nitrate; phosphorus-deficient; non-limiting phosphate; nitrogen-deficient; and non-limiting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy biomass; Monoraphidium; Chlorella; Desmodesmus; Microcystis; Lipid accumulation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301239

Protolith age of Santa Maria Chico granulites dated on zircons from an associated amphibolite-facies granodiorite in southernmost Brazil
Provedor de dados: 42
Autores: Hartmann,Léo A.; Liu,Dunyi; Wang,Yenbin; Massonne,Hans-Joachim; Santos,João O.S.
U-Pb dating of zircon was undertaken with the Beijing SHRIMP II (sensitive high resolution ion microprobe) on anamphibolite facies granodiorite and an almandine-albite granulite from the Santa Maria Chico Granulitic Complex, southern Brazilian Shield. This work was also done to unravel protolith ages which are often hidden in the array of partly reset data. The obtained metamorphic ages of the granodiorite gneiss and the granulite are 2035 ± 9 Ma and 2006 ± 3 Ma, respectively. These data are within the range of metamorphic ages determined in previous studies (2022 ± 18 Ma and 2031 ± 40 Ma). However, protolith ages for the granodiorite (2366 ± 8 Ma) and the granulite (2489 ± 6 Ma) were obtained which are outside the previously recognized range (&gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protolith age; Paleoproterozoic; Zircon geochronology; Santa Maria Chico Granulitic Complex; SHRIMP.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300014

Brazilian natural fiber (jute) as raw material for activated carbon production
Provedor de dados: 42
Autores: ROMBALDO,CARLA F.S.; LISBOA,ANTONIO C.L.; MENDEZ,MANOEL O.A.; COUTINHO,APARECIDO R.
Jute fiber is the second most common natural cellulose fiber worldwide, especially in recent years, due to its excellent physical, chemical and structural properties. The objective of this paper was to investigate: the thermal degradation of in natura jute fiber, and the production and characterization of the generated activated carbon. The production consisted of carbonization of the jute fiber and activation with steam. During the activation step the amorphous carbon produced in the initial carbonization step reacted with oxidizing gas, forming new pores and opening closed pores, which enhanced the adsorptive capacity of the activated carbon. N2 gas adsorption at 77K was used in order to evaluate the effect of the carbonization and activation steps. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activation; Adsorption; Carbonization; Jute fiber; Thermogravimetry.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402137

Antioxidant effect of quinoline derivatives containing or not selenium: Relationship with antinociceptive action quinolines are antioxidant and antinociceptive
Provedor de dados: 42
Autores: WILHELM,ETHEL A.; FERREIRA,ANA TERESINHA; PINZ,MIKAELA P.; REIS,ANGÉLICA S. DOS; VOGT,ANE G.; STEIN,ANDRE L.; ZENI,GILSON; LUCHESE,CRISTIANE.
ABSTRACT The present study investigated the antioxidant effect of a new class of quinoline derivatives (a-d) on assays in vitro. Lipid peroxidation, thiol peroxidase-like and free radical scavenging activities were determined to evaluate antioxidant activity of compounds. Thiol oxidase-like and δ-aminolevulinate dehydratase activities were performed as a toxicological parameter. A second objective of this study was to evaluate the in vivo antinociceptive effect of the compound with better antioxidant effect and without toxic effects in a model of nociception induced by formalin in mice. In liver, at 100 µM, compound a reduced the lipid peroxidation to the control levels, while compounds c and d partially reduced it. In brain, only compound d partially...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antinociceptive; Antiedematogenic; Anti-inflammatory; Antioxidant; Quinoline.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200457

200.000 IU of vitamin D does not reduce resting Blood Pressure and Inhibit Post-Exercise Hypotension in elderly women: a pilot study
Provedor de dados: 42
Autores: GONÇALVES,MARIA DA CONCEIÇÃO R.; MIRANDA NETO,MANOEL; CAVALCANTE,ISA G.M.; SEBADELHE,VITTÓRIA R.R.J.; SOUZA,MICHELE F. De; NEVES,JULIANA P.R.; SOUZA,FLAVIA T.L. DE; TAVARES,RENATA L.; COSTA,MATHEUS S.; SILVA,ALEXANDRE S.
Abstract  Given the scarcity of studies with elderly and the existence of studies investigating the effect of vitamin D supplementation in PEH (post exercise hypotension), this study evaluated the effect of a single megadose of vitamin D on resting blood pressure (RBP) and post-exercise hypotension (PEH) in the elderly. 11 hypertensive elderly women (70.3 ± 1.7 years) received a single megadose of 200.000 IU of cholecalciferol or a placebo, orally, through capsules. On day 7, the subjects performed 30 minutes of aerobic exercise with blood pressure measurement before exercise and every 10 minutes after exercise during 60 minutes, besides cardiac autonomic modulation. RBP did not significantly change. Exercise promoted significant systolic PEH only in one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerobic exercise; Aged; Hypertension; Hypotension; Cholecalciferol.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100903

Radiocarbon geochronology of the sediments of the São Paulo Bight (southern Brazilian upper margin)
Provedor de dados: 42
Autores: Mahiques,Michel M.; Sousa,Silvia H.M.; Burone,Leticia; Nagai,Renata H.; Silveira,Ilson C.A.; Figueira,Rubens C.L.; Soutelino,Rafael G.; Ponsoni,Leandro; Klein,Daniel A.
The aim of this work was to generate an inventory of the data on radiocarbon datings obtained from sediments of the São Paulo Bight (southern Brazilian upper margin) and to analyze the data in terms of Late Quaternary sedimentary processes and sedimentation rates. A total of 238 radiocarbon datings from materials collected using differents ampling procedures was considered for this work. The sedimentation rates varied from less than 2 to 68 cm.kyr-1. The highest sedimentation rate values were found in a low-energy (ría type) coastal system as well as in the upwelling zones of Santa Catarina and Cabo Frio. The lowest rates were found on the outer shelf and upper slopes. Our results confirm the strong dependency of the shelf currents, with an emphasis to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continental margin; Quaternary; Radiocarbon; Sea-level; Sedimentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300006

Glycosynapses: microdomains controlling carbohydrate-dependent cell adhesion and signaling
Provedor de dados: 42
Autores: Hakomori,Senitiroh.
The concept of microdomains in plasma membranes was developed over two decades, following observation of polarity of membrane based on clustering of specific membrane components. Microdomains involved in carbohydrate-dependent cell adhesion with concurrent signal transduction that affect cellular phenotype are termed "glycosynapse". Three types of glycosynapse have been distinguished: "type 1" having glycosphingolipid associated with signal transducers (small G-proteins, cSrc, Src family kinases) and proteolipids; "type 2" having O-linked mucin-type glycoprotein associated with Src family kinases; and "type 3" having N-linked integrin receptor complexed with tetraspanin and ganglioside. Different cell types are characterized by presence of specific types...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clustering; Carbohydrate-to-carbohydrate interaction; Carbohydrate-binding protein; Integrin; Tetraspanin; Growth factor receptor.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300010

Geological features and the Paleoproterozoic collision of four Archean crustal segments of the São Francisco Craton, Bahia, Brazil: a synthesis
Provedor de dados: 42
Autores: BARBOSA,JOHILDO S.F.; SABATÉ,PIERRE.
Recent geological, geochronological and isotopic research has identified four important Archean crustal segments in the basement of the São Francisco Craton in the State of Bahia. The oldest Gavião Block occurs in the WSW part, composed essentially of granitic, granodioritic and migmatitic rocks. It includes remnants of TTG suites, considered to represent the oldest rocks in the South American continent (~ 3,4Ga) and associated Archean greenstone belt sequences. The youngest segment, termed the Itabuna-Salvador-Curaçá Belt is exposed along the Atlantic Coast, from the SE part of Bahia up to Salvador and then along a NE trend. It is mainly composed of tonalite/trondhjemites, but also includes stripes of intercalated metasediments and ocean-floor/back-arc...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geological; Geochronological and isotopic research; Archean segments; Paleoproterozoic collision.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200009

Structure and anticoagulant properties of sulfated glycosaminoglycans from primitive Chordates
Provedor de dados: 42
Autores: PAVÃO,MAURO S. G.
Dermatan sulfates and heparin, similar to the mammalian glycosaminoglycans, but with differences in the degree and position of sulfation were previously isolated from the body of the ascidian Styela plicata and Ascidia nigra. These differences produce profound effects on their anticoagulant properties. S. plicata dermatan sulfate composed by 2-O-sulfatedalpha-L-iduronic acid and 4-O-sulfated N-acetyl-beta-D-galactosamine residues is a potent anticoagulant due to a high heparin cofactor II activity. Surprisingly, it has a lower potency to prevent thrombus formation on an experimental model and a lower bleeding effect in rats than the mammalian dermatan sulfate. In contrast, A. nigra dermatan sulfate, also enriched in 2-O-sulfated alpha-L-iduronic acid, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascidian; Heparin; Dermatan sulfate; Heparin cofactor II; Anticoagulant; Antithrombotic.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100007

Health benefits of subcutaneous zinc edetate and diphenyl diselenide in calves during the weaning period
Provedor de dados: 42
Autores: SANTOS,DAIANE S. DOS; BOITO,JHONATAN P.; KLAUCK,VANDERLEI; REIS,JOÃO H. DOS; GEBERT,ROGER R.; GLOMBOWSKY,PATRÍCIA; BIAZUS,ANGELISA H.; BOTTARI,NATHIELI B.; SOUSA,REJANE S.; MACHADO,GUSTAVO; LEAL,MARTA L.R.; BALDISSERA,MATHEUS D.; BERWANGER,JEAN C.; SILVA,ALEKSANDRO S. DA.
Abstract: The aims of this study were to investigate whether treatments with zinc edetate (Zn) and diphenyl diselenide ((PhSe)2) enhance performance, immune responses, protein metabolism, and oxidant/antioxidant status in calf serum and muscle. Animals were divided into four groups (n=6 each): control (without supplementation), and groups supplemented on days 50 and 70 of life with (PhSe)2, Zn, and a combination of (PhSe)2 and Zn. Animals treated with (PhSe)2 gained more weight by experimental day 220 than did the control group, but there was no difference by the end of the experiment (day 300). The absolute number of leukocytes and lymphocytes increased in groups Zn and (PhSe)2+Zn on day 20 of experiment, but decreased on day 40 in groups (PhSe)2, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calves; Zinc edetate; (PhSe)2; Animal health.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100807

Production, purification and characterization of a thermostable β-1,3-glucanase (laminarinase) produced by Moniliophthora perniciosa
Provedor de dados: 42
Autores: Sena,Amanda R.; Júnior,Gildomar L.V.; Góes Neto,Aristóteles; Taranto,Alex G.; Pirovani,Carlos P.; Cascardo,Júlio C.M.; Zingali,Russolina B.; Bezerra,Marcos A.; Assis,Sandra A.
The enzyme glucanase from Moniliophthora perniciosa was produced in liquid medium and purified from the culture supernatant. A multivariate statistical approach (Response Surface Methodology - RSM) was employed to evaluate the effect of variables, including inducer (yeast extract) and fermentation time, on secreted glucanase activities M. perniciosa detected in the culture medium. The crude enzyme present in the supernatant was purified in two steps: precipitation with ammonium sulfate (70%) and gel filtration chromatography on Sephacryl S-200. The best inducer and fermentation time for glucanase activities were 5.9 g L-1 and 13 days, respectively. The results revealed three different isoforms (GLUI, GLUII and GLUIII) with purification factors of 4.33,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glucanase; Moniliophthora perniciosa; Production; Kinetic characterization; Purification; Heat stability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200019

Hemagglutinating/Hemolytic activities in extracts of marine invertebrates from the Brazilian coast and isolation of two lectins from the marine sponge Cliona varians and the sea cucumber Holothuria grisea
Provedor de dados: 42
Autores: Moura,Raniere M.; Melo,Arthur A.; Carneiro,Rômulo F.; Rodrigues,Cícera R.f.; Delatorre,Plínio; Nascimento,Kyria S.; Saker-Sampaio,Silvana; Nagano,Celso S.; Cavada,Benildo S.; Sampaio,Alexandre H.
Twenty species of marine invertebrates from the Brazilian coast were screened for hemagglutinating/hemolytic activity. In at least twelve tested species, hemagglutinating activity was different for different blood types, suggesting the presence of lectins. Extracts from four species showed hemolytic activity. Two new lectins were purified from the marine sponge Cliona varians (CvL-2) and sea cucumber Holothuria grisea (HGL). CvL-2 was able to agglutinate rabbit erythrocytes and was inhibited by galactosides. The hemagglutinating activity was optimal in pH neutral and temperatures below 70 °C. CvL-2 is a trimeric protein with subunits of 175 kDa. On the other hand, HGL showed both hemagglutinating and hemolytic activity in human and rabbit erythrocytes, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Purification; Hemolysis; Cytotoxicity; Galactose.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200973

Microhabitat of small mammals at ground and understorey levels in a deciduous, southern Atlantic Forest
Provedor de dados: 42
Autores: MELO,GERUZA L.; MIOTTO,BARBARA; PERES,BRISA; CACERES,NILTON C.
Each animal species selects specific microhabitats for protection, foraging, or micro-climate. To understand the distribution patterns of small mammals on the ground and in the understorey, we investigated the use of microhabitats by small mammals in a deciduous forest of southern Brazil. Ten trap stations with seven capture points were used to sample the following microhabitats: liana, fallen log, ground litter, terrestrial ferns, simple-trunk tree, forked tree, and Piper sp. shrubs. Seven field phases were conducted, each for eight consecutive days, from September 2006 through January 2008. Four species of rodents (Akodon montensis, Sooretamys angouya, Oligoryzomys nigripes and Mus musculus) and two species of marsupials (Didelphis albiventris and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cricetid rodents; Didelphid marsupials; Habitat selection; Predator-prey relationship; Vertical space use.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200727

Studying the influence of a secondary variable in Collocated Cokriging estimates
Provedor de dados: 42
Autores: Rocha,Marcelo M.; Yamamoto,Jorge K.; Watanabe,Jorge; Fonseca,Priscilla P.
Neste artigo examina-se a influência da variável secundária como função da correlação com a variável primária na cokrigagem colocalizada. Para este estudo cinco bases de dados completas foram geradas no computador a partir das quais amostras com 60 e 104 pontos de dados foram retirados através do método de amostragem aleatória estratificada. Estas bases de dados completas foram geradas partindo-se de um par de variáveis, primária e secundária, que apresentam boa correlação. Então sucessivos conjuntos foram gerados adicionando-se uma quantidade de ruído branco de modo que a correlação se tornasse menor. Utilizando-se estas amostras foi possível encontrar o quanto as informações primária e secundária são utilizadas na estimativa de um ponto não amostrado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cokrigagem colocalizada; Coeficientes de correlação; Pesos de estimativa; Modelo de Markov; Geoestatística multivariada.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200008

The exotic jumping snail Ovachlamys fulgens (Gude, 1900) (Gastropoda: Helicarionidae) in urban areas of the Upper-Paraná Atlantic Forest
Provedor de dados: 42
Autores: BELTRAMINO,ARIEL A.; VOGLER,ROBERTO E.; RUMI,ALEJANDRA; GUZMÁN,LEILA B.; MARTÍN,STELLA M.; PESO,JUANA G.
ABSTRACT The exotic land gastropod Ovachlamys fulgens (Gude, 1900), aka the jumping snail, was registered in Eldorado city, Misiones province, constituting the first documented record of that species in Argentina-and for all of South America as well. Identities of the individuals were confirmed through morphological examination, and by a DNA sequencing of the cytochrome oxidase subunit I gene. DNA sequences for the mitochondrial 16S-rRNA and the nuclear 18S-rRNA genes were also obtained from the morphologically-confirmed specimens to gain insights into the genetic background of this species in Argentina, and as additional markers for enhancing the rapidity of identification by governmental authorities who are responsible for managing the presence of exotic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Introduced species; Misiones province; Molecular markers; Nonnative snail.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401591

Application of shallow seismic profiling to study riverbed architectural facies: a case study of the Tocantins river (Pará - Brazil)
Provedor de dados: 42
Autores: Ianniruberto,Marco; Campos,José E.G.; Araújo,Vitto C.M.
To date, the vast majority of river sedimentology study has relied on two main categories of observation: direct observation of shallow trenches, cut faces and cores or geophysical survey on dry and shallow regions of braid bars. In this study, a sub-bottom profiler was used to investigate the stratigraphy of the lower course of the Tocantins River in the Amazon region, between the city of Tucuruì and the village of Nazaré dos Patos. The interest in this specific region lies on the possible variation of the fluvial regime due to the installation of the dam of the Tucuruì hydroelectric plant and the perspective that such river would become navigable as soon as the canal lock will be completed. Collected data show a detailed variety and complexity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anastomosed rivers; Alluvial sedimentology; Architectural facies; Stratigraphy; High-resolution seismic.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300007

Effective microorganisms inoculant: Diversity and effect on the germination of palisade grass seeds
Provedor de dados: 42
Autores: SANTOS,LIDIANE F. DOS; LANA,ROGÉRIO P.; SILVA,MARLIANE C.S. DA; VELOSO,TOMÁS G.R.; KASUYA,MARIA CATARINA M.; RIBEIRO,KARINA G.
Abstract  Effective microorganisms (EM) are inoculants formed by fungi and bacteria isolated from soil. EM are commonly used by farmers on agronomic crops to stimulate plant growth, but their composition and their benefits has been controverted. This study aimed to analyze the diversity of microorganisms growing in three EM inoculants, as well as to evaluate their efficiency in the germination of palisade grass seeds. The total DNA of the three EM inoculants was extracted, the 16S rRNA and ITS genes were amplified by PCR and sequenced on the Illumina MiSeq platform. Germination tests were conducted with three type of the EM, in three concentration and two times of the immersion. The bacterial group was the most abundant in EM, followed by fungi. Bacterial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Dormancy; Sequencing; Sulfuric acid.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201002

Sedimentation and pedogenic features in a clay deposit in Quadrilátero Ferrífero, Minas Gerais, Brazil
Provedor de dados: 42
Autores: Santos,Maria-do-Carmo; Varajão,Angélica F.D.C.
The clay deposit of Caxambu Hill occurs in a NW/SE oriented graben originated by syntectonic sedimentation during Cenozoic. Four facies were identified (fragmentary, nodular, massive and friable) and their differentiation is related to gravity mass-flow processes. The fragmentary facies is composed of extraclast fragments of the local Paleoproterozoic basement and sand size quartz-grains dispersed in a kaolinite-muscovite-goethitehematite matrix. The nodular facies is constituted by lithorelictal and pedorelictal nodules dispersed in a similar matrix as in the fragmentary facies. The massive facies is characterized by quartz grains dispersed in a kaolinite, hematite and goethite matrix with minor amounts of muscovite. The friable facies differs from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kaolinite; Lithofacies; Micromorphology; Gravity mass flow; Chemical weathering.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100013

Agro-economic yield of taro clones in Brazil, propagated with different types of cuttings, in three crop seasons
Provedor de dados: 42
Autores: HEREDIA ZARATE,NESTOR A.; VIEIRA,MARIA C.; TABALDI,LUCIANE A.; HEREDIA VIEIRA,DANILO A.; JORGE,ROSIMEIRE P.G.; SALLES,NATALIA A.
The experimental studies were conducted in 2007-2008, 2008-2009 and 2009-2010 crop seasons, in order to know the agro-economic yield of 'Chinês' and "Macaquinho" taro clones, propagated using huge, extra, large, medium, small and tiny cormels. The harvest was done on average on 202 days after planting, in three crop seasons. Based on the joint analysis of variance carried out, it was observed that taro clones showed significant differences in the yield of fresh and dry weight of leaves, cormels, and commercial and non-commercial comels; besides, there were significant differences in yield of a crop season to another and the size of the cuttings induced significant differences in yield. In the conditions that the experiments were conducted, and considering...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colocasia esculenta; Rhizome; Production; Income.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200785

Public engagement in science: Mapping out and understanding the practice of science communication in Latin America
Provedor de dados: 42
Autores: BARBA,MA DE LOURDES PATIÑO; CASTILLO,JORGE PADILLA GONZÁLEZ DEL; MASSARANI,LUISA.
This article presents the results of a study aiming to map out the characteristics of science communication activities carried out in Latin America by different organizations. We looked at a general description of the activities (such as the kind of activities carried out, in which periodicity, the publics engaged in the activities, etc.) and the favorable and unfavorable existing conditions in the organizations (such as budget and planning, evaluation, as well as weakness and strengths). The study focused on gathering primary information, through an online survey, answered by 123 institutions from 14 countries. Although the results are not representative of the entire Latin America – and it would be not possible to be so, since it is not even known the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Latin America; Science and public; Science communication; Science popularization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000101001

Antifungal susceptibility of yeasts isolated from anthropogenic watershed
Provedor de dados: 42
Autores: MILANEZI,ANA C.M.; WITUSK,JOÃO P.D.; VAN DER SAND,SUELI T.
Abstract Yeasts are unicellular fungi widespread in the environment, and studies suggest that there is a positive correlation between yeast and polluted aquatic environments. The aim of this study was to analyze the diversity and resistance of yeasts isolated from water samples collected along the Arroio Dilúvio in Porto Alegre to antifungals. Yeast isolates from the Arroio Dilúvio were subjected to susceptibility assays against antifungals using the minimum inhibitory concentration (MIC) test, and amplification of the ITS1-5.8S-IT2 region; in addition, the ITS-5.8S region was sequenced for some of the isolates. The amplification product was subjected to PCR-RFLP, and the restriction profile allowed the construction of a dendrogram. Susceptibility tests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yeast; Antifungal; Watershed; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100601

Anticipating the response of the Brazilian giant earthworm (Rhinodrilus alatus) to climate change: implications for its traditional use
Provedor de dados: 42
Autores: HUGHES,FREDERIC M.; CÔRTES-FIGUEIRA,JOSÉ EUGÊNIO; DRUMOND,MARIA AUXILIADORA.
Abstract Our understanding of the impacts of ongoing global warming on terrestrial species has increased significantly during the last several years, but how climatic change has affected, and will affect, the distribution of earthworms remains largely unknown. We used climate niche modeling to model the current distribution of the giant earthworm Rhinodrilus alatus - an endemic species of the Cerrado Domain in Brazil, which is traditionally harvested and commercialized for fishing bait. R. alatus is sensitive to environmental changes because climate, in synergy with soil attributes, determine its annual reproductive cycle and distribution. The paleoclimatic reconstructions predict important geographical shifts from LGM (~21,000 yBp) to the present...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Ecological niche modeling; Giant earthworm; Harvesting; Management; Rhinodrilus alatus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100605

In vivo and in vitroeffects of fructose on rat brain acetylcholinesterase activity: an ontogenetic study
Provedor de dados: 42
Autores: GUIMARÃES,CARINE A.; BIELLA,MAIRIS S.; LOPES,ABIGAIL; DEROZA,PEDRO F.; OLIVEIRA,MARIANA B.; MACAN,TAMIRES P.; STRECK,EMILIO L.; FERREIRA,GUSTAVO C.; ZUGNO,ALEXANDRA I.; SCHUCK,PATRÍCIA F.
Increased fructose concentrations are the biochemical hallmark of fructosemia, a group of inherited disorders on the metabolic pathway of this sugar. The main clinical findings observed in patients affected by fructosemia include neurological abnormalities with developmental delay, whose pathophysiology is still undefined. In the present work we investigated the in vitro and in vivo effects of fructose on acetylcholinesterase (AchE) activity in brain structures of developing rats. For the in vitro experiments, fructose was added at increasing concentrations to the incubation medium. It was observed that fructose provoked an inhibition of acetylcholinesterase activity in cerebral cortex of 30-day-old-rats, even at low concentrations (0.1 mM). For the in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase; Brain; Fructosel hereditary fructose intolerance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401919

Influence of mass transfer on bubble plume hydrodynamics
Provedor de dados: 42
Autores: LIMA NETO,IRAN E.; PARENTE,PRISCILA A.B.
ABSTRACT This paper presents an integral model to evaluate the impact of gas transfer on the hydrodynamics of bubble plumes. The model is based on the Gaussian type self-similarity and functional relationships for the entrainment coefficient and factor of momentum amplification due to turbulence. The impact of mass transfer on bubble plume hydrodynamics is investigated considering different bubble sizes, gas flow rates and water depths. The results revealed a relevant impact when fine bubbles are considered, even for moderate water depths. Additionally, model simulations indicate that for weak bubble plumes (i.e., with relatively low flow rates and large depths and slip velocities), both dissolution and turbulence can affect plume hydrodynamics, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeration; Bubbles; Hydrodynamics; Mass transfer; Modeling; Oxygenation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100411

Distributional patterns of Aptian-Albian paleoichthyofauna of Brazil and Africa based on Track Analysis
Provedor de dados: 42
Autores: PARMÉRA,THAÍS C.C.; GALLO,VALÉRIA; SILVA,HILDA M.A. DA; FIGUEIREDO,FRANCISCO J. DE.
ABSTRACT The Aptian-Albian paleoichthyofauna in Brazil and Africa is quite diverse, yet their geographic patterns still require accounts. This work consists of a panbiogeographical analysis of paleoichthyofauna from Aptian-Albian through track analysis. Geographic coordinates were obtained and converted into paleocoordinates. Individual Tracks (ITs) and Generalized Tracks (GTs) were built with the aid of ArcView GIS v3.2 program using Trazos2004 extension. As a result, four GTs and tree Biogeographic Nodes (A, B and C) had been identified. GTs 1 and 2 shows two different faunas. GT3 indicates similarity between Brazil and Africa paleoichthyofauna suggesting the break-up of Gondwana as the event that separated it. GT4 represents a probable local seaway...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aptian-Albian; Gondwana Break-up; Historical biogeography; Track analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400501

Genetic Population Structure and Allele Surfing During Range Expansion in Dynamic Habitats
Provedor de dados: 42
Autores: BRAGA,ROSANA T.; RODRIGUES,JOÃO F.M.; DINIZ-FILHO,JOSÉ A.F.; RANGEL,THIAGO F.
Abstract: Expanding populations may loss genetic diversity because sequential founder events throughout a wave of demographic expansion may cause “allele surfing”, as the alleles of founder individuals may propagate rapidly through space. The spatial components of allele surfing have been studied by geneticists, but have never been investigate on dynamic and shifting habitats. Here we used an individual-based-model (IBM) to study how interactions between different habitat restoration scenarios and biological characteristics (dispersal capacity) affect the spatial patterns of the genetic structure of a population during demographic expansion. We found that both habitat dynamics and dispersal capacity, as well as their interaction, were the drivers of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allele surfing; Dispersal; Habitat suitability; Individual-based-model; Simulation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300607

Mangroves Response to Climate Change: A Review of Recent Findings on Mangrove Extension and Distribution
Provedor de dados: 42
Autores: Godoy,Mario D.P.; Lacerda,Luiz D. de.
Mangroves function as a natural coastline protection for erosion and inundation, providing important environmental services. Due to their geographical distribution at the continent-ocean interface, the mangrove habitat may suffer heavy impacts from global climate change, maximized by local human activities occurring in a given coastal region. This review analyzed the literature published over the last 25 years, on the documented response of mangroves to environmental change caused by global climate change, taking into consideration 104 case studies and predictive modeling, worldwide. Most studies appeared after the year 2000, as a response to the 1997 IPCC report. Although many reports showed that the world's mangrove area is decreasing due to direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate; Mangrove; Limits; Migration.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200651

Creep of a C-S-H gel: a micromechanical approach
Provedor de dados: 42
Autores: Sanahuja,Julien; Dormieux,Luc.
Both clays and calcium silicate hydrates(the main hydration products of Portland cements) exhibit a microstructure made up of lamellar particles. The microscopic mechanism responsible for the macroscopic creep of such materials is often described as the relative sliding of the sheets. This paper proposes a micromechanical approach to estimate the macroscopic creep behavior rising from this microscopic mechanism. The asymptotic evolution of creep at both short- and long-term is especially investigated. More precisely, a non-vanishing initial elastic strain is retrieved. At long-term, a threshold on porosity appears. At lower porosities, the creep evolution admits an asymptotic strain. At higher porosities, it admits an asymptotic strain rate.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homogenization; Creep; Cement paste; C-S-H gel.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100004

Herman Lent, scientist and citizen - I
Provedor de dados: 42
Autores: Santos,Claudia P.
Tipo: Info:eu-repo/semantics/article
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300002

Molecular epidemiology of 16S rRNA methyltransferase in Brazil: RmtG in Klebsiella aerogenes ST93 (CC4)
Provedor de dados: 42
Autores: PASSARELLI-ARAUJO,HEMANOEL; PALMEIRO,JUSSARA K.; MOHARANA,KANHU C.; PEDROSA-SILVA,FRANCISNEI; DALLA-COSTA,LIBERA M.; VENANCIO,THIAGO M.
Abstract Aminoglycosides are a class of antibiotics that play a key role in antimicrobial treatment of Multidrug resistant (MDR) Gram-negative bacilli, typically in combination with β-lactams. Ribosomal 16S RNA modification by methyltransferases (e.g. RmtG) is an aminoglycoside resistance mechanism that, along with the occurrence carbapenem-resistant Enterobacteriaceae (CRE), has become a clinical concern. In Brazil, rmtG genes were initially reported in Klebsiella pneumoniae, and monitoring isolates from other species carrying this gene is critical for epidemiological studies and to prevent dissemination. Here we report the presence of rmtG in Klebisella aerogenes D3 and characterize its genetic context in comparison to isolates from other species....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Klebsiella aerogenes; Aminoglycoside; 16S rRNA methyltransferases; Multidrug resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200602

Salinity and stable oxygen isotope relationship in the Southwestern Atlantic: constraints to paleoclimate reconstructions
Provedor de dados: 42
Autores: BELEM,ANDRE L.; CARICCHIO,CAMILLA; ALBUQUERQUE,ANA LUIZA S.; VENANCIO,IGOR M.; ZUCCHI,MARIA DO R.; SANTOS,TARCIO HENRIQUE R. DOS; ALVAREZ,YACI GALLO.
Abstract: Stable isotopes have been widely used in the literature both to discuss current ocean circulation processes, as well as to reconstitute paleoceanographic parameters. The distribution of oxygen and deuterium stable isotopes in seawater (δ18Osw and δDsw) at the Western Tropical South Atlantic border was investigated to better understand the main fractionation processes of these isotopes and establish a regional salinity and δ18Osw relation to improve the paleoceanographic knowledge in the region. This study was conducted during a quasi-synoptic oceanographic cruise in which 98 discrete seawater samples were collected in the core of the main water masses for stable isotope analysis. A strong correlation between δ18Osw and δD was found, which made it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleosalinity; Stable isotopes; Southwestern Atlantic; Oxygen 18; Seawater isotopic composition.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500504

Floristic evolution in an agroforestry system cultivation in Southern Brazil
Provedor de dados: 42
Autores: SILVA,LUÍS C.R.; MACHADO,SEBASTIÃO A.; GALVÃO,FRANKLIN; FIGUEIREDO FILHO,AFONSO.
ABSTRACT Bracatinga (Mimosa scabrella Bentham) is an important pioneer tree species in Ombrophylous Mixed Forest of Brazil and is widely used as an energy source. In traditional agroforestry systems, regeneration is induced by fire, then pure and dense stands known as bracatinga stands (bracatingais) are formed. In the first year, annual crops are intercalated with the seedlings. At that time the seedlings are thinned, then the stands remain at a fallow period and cut at seven years old. The species is very important mainly for small landowners. We studied the understory species that occur naturally during the succession over several years in order to manage them rationally in the future and maintain the natural vegetation over time. Three to 20 year-old...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bracatinga stands; Diversity Index; Ecological succession; Evenness Index.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300973

Evaluation of the altimetry from SRTM-3 and planimetry from high-resolution PALSAR FBD data for semi-detailed topographic mapping in the Amazon Region
Provedor de dados: 42
Autores: Rodrigues,Thiago G.; Paradella,Waldir R.; Oliveira,Cleber G.
The Brazilian Amazon has a deficit of 35% of coverage regarding topographic mapping at semi-detailed (1:100,000) scale. This paper presents an alternative to overcome this scenario using a combination of planialtimetric information from two orbital SAR (Synthetic Aperture Radar) missions. The altimetry was acquired from Shuttle Radar Topography Mission (SRTM), while the planimetry was provided from Fine Beam Dual (FBD) images of the Phased Array L-band Synthetic Aperture Radar (PALSAR) sensor. The research was carried out in the mountainous area of the Serra dos Carajás (Pará State), located on the Amazon region. The quality of the orbital topographic information was evaluated regarding precise planialtimetric measurements acquired from Global Positioning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Topographic mapping; SRTM-3; ALOS/PALSAR; Ortho-images; Amazon Region.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300014

Production of 5-hydroxy-7-methoxy-4-methylphthalide in a culture of Penicillium crustosum
Provedor de dados: 42
Autores: Valente,Angela M.M.P.; Ferreira,Antonio G.; Daolio,Cristina; Rodrigues Filho,Edson; Boffo,Elisangela F.; Souza,Antonia Q.L.; Sebastianes,Fernanda L.S.; Melo,Itamar S.
The chemical reactions carried out by microorganisms have been used as a tool in modern chemistry. This paper reports the production of mycophenolic acid and a new phthalide by the endophytic fungus Penicillium crustosum obtained from coffee seeds. The fungus was cultivated in a liquid medium for a period of seven days and after that the culture medium was divided into four treatments: A, B, C and D, to which different organic substances were added. Treatment A was maintained as the control to evaluate the occurrence of biotransformation. Organic acids were added to the culture media of treatments B (ferulic and quinic acids) and C [cinnamic and 3,4-(methylenedioxy) cinnamic acids], and caffeine was added in the treatment D. All these organic compounds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Endophytic fungus; Mycophenolic acid; Penicillium crustosum; 5-hydroxy-7-methoxy-4-methylphthalide.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200487

Native and ornamental exotic resources in pollen loads and garbage pellets of four stingless bees (Apidae, Meliponini) in an urban environment with riparian native forest
Provedor de dados: 42
Autores: VOSSLER,FAVIO G.
Abstract:  An entomopalynological study to assess pollen use by wild bees was performed in an urban environment with riparian native forest in the Chaco region of Argentina. A combined method for sampling pollen loads and garbage pellets at nest entrances in four stingless bees with different entrance size and forager traffic was here successfully used. Sampling was carried out in a short period of time (late winter) and located within a distance of 50 m. Pollen analysis using acetolysis showed that most identified pollen types (31) were from native species, 12 from ornamental exotic species, 5 included native and ornamental exotic species and 18 of uncertain status. A much broader pollen spectrum was present in garbage pellets (62 types) than loads (14...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopalynology; Geotrigona argentina; Plebeia catamarcensis; Polylectic bee; Scaptotrigona jujuyensis; Tetragonisca angustula fiebrigi.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700607

Foraging behavior of two egg parasitoids exploiting chemical cues from the stink bug Piezodorus guildinii (Hemiptera: Pentatomidae)
Provedor de dados: 42
Autores: CINGOLANI,MARÍA FERNANDA; BARAKAT,MARÍA C.; LILJESTHRÖM,GERARDO GUSTAVO; COLAZZA,STEFANO.
Abstract: Several parasitoids attacking the same host may lead to competition. Adult parasitoids’ abilities to find, parasitize and defend hosts determine resource’s retention potential. In soybean, two egg parasitoid species, Telenomus podisi and Trissolcus urichi (Hymenoptera: Platygastridae), compete on the egg masses of Piezodorus guildinii (Hemiptera: Pentatomidae) one of the major pest of this crop. We evaluated parasitoid’s abilities to exploit hosts’ footprints; and parasitoid’s behavior when competing for the same host. Both arena residence time and retention time were similar for T. podisi and T. urichi on male or female host footprints. In its turn, T. urichi reentered the area contaminated with P. guildinii more times and staid longer in it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Coexistence; Natural enemies; Platygastridae; Searching behavior; Stink bugs.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500867

Long-distance calls in Neotropical primates
Provedor de dados: 42
Autores: Oliveira,Dilmar A.G.; Ades,César.
Long-distance calls are widespread among primates. Several studies concentrate on such calls in just one or in few species, while few studies have treated more general trends within the order. The common features that usually characterize these vocalizations are related to long-distance propagation of sounds. The proposed functions of primate long-distance calls can be divided into extragroup and intragroup ones. Extragroup functions relate to mate defense, mate attraction or resource defense, while intragroup functions involve group coordination or alarm. Among Neotropical primates, several species perform long-distance calls that seem more related to intragroup coordination, markedly in atelines. Callitrichids present long-distance calls that are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Long calls; Neotropics; Primates; Vocal communication.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200031

Eocene-Pliocene deep sea ostracodes from ODP site 744A, Southern Indian Ocean
Provedor de dados: 42
Autores: Bergue,Cristianini T.; Govindan,Abiraman.
The Eocene-Pliocene deep sea ostracodes from the ODP site 744A (Kerguelen Plateau) are herein studied under the taxonomic and paleoecologic aspects. 28 species are identified, being the genera Krithe, Cytherella and Dutoitella the most diversified. A faunal threshold was recorded in the Early Oligocene, which is tentatively explained under the knowledge of the paleoceanographical studies carried out not only in the Kerguelen Plateau but also in adjacent areas. The faunal turnover and variations in both richness and abundance possibly reflect the inception of psychrosphere and the influence of hydrological changes in the preservation of carapaces. Moreover, the influence of those changes on carbonate preservation is discussed as the cause of faunal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cenozoic; Ostracodes; Paleoceanography; Paleozoogeography.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300021

The Antifungal Activity of Naphthoquinones: An Integrative Review
Provedor de dados: 42
Autores: FUTURO,DÉBORA O.; FERREIRA,PATRICIA G.; NICOLETTI,CAROLINE D.; BORBA-SANTOS,LUANA P.; SILVA,FERNANDO C. DA; ROZENTAL,SONIA; FERREIRA,VITOR FRANCISCO.
ABSTRACT Naphthoquinones are the most commonly occurring type of quinones in nature. They are a diverse family of secondary metabolites that occur naturally in plants, lichens and various microorganisms. This subgroup is constantly being expanded through the discovery of new natural products and by the synthesis of new compounds via innovative techniques. Interest in quinones and the search for new biological activities within the members of this class have intensified in recent years, as evidenced by the evaluation of the potential antimicrobial activities of quinones. Among fungi of medical interest, yeasts of the genus Candida are of extreme importance due to their high frequency of colonization and infection in humans. The objective of this review is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quinones; Xanthenes; Lapachol; Lawsone; Candida spp; Disc diffusion method.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301187

Agronomic viability of New Zealand spinach and kale intercropping
Provedor de dados: 42
Autores: CECÍLIO FILHO,ARTHUR B.; BIANCO,MATHEUS S.; TARDIVO,CAROLINE F.; PUGINA,GABRIEL C.M.
ABSTRACT The intercropping is a production system that aims to provide increased yield with less environmental impact, due to greater efficiency in the use of natural resources and inputs involved in the production process. An experiment was carried out to evaluate the agronomic viability of kale and New Zealand spinach intercropping as a function of the spinach transplanting time. (0, 14, 28, 42, 56, 70, 84 and 98 days after transplanting of the kale). The total yield (TY) and yield per harvest (YH) of the kale in intercropping did not differ from those obtained in monoculture. The spinach TY was influenced by the transplanting time, the earlier the transplanting, the higher the TY. The spinach YH was not influenced by the transplanting time, but rather...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tetragonia expansa; Brassica oleracea var. acephala; Cultivation system; Land use efficiency; Competition index.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602975

Structure, surface area and morphology of aluminas from thermal decomposition of Al(OH)(CH3COO)2 crystals
Provedor de dados: 42
Autores: KIYOHARA,PEDRO K.; SANTOS,HELENA SOUZA; COELHO,ANTONIO C. VIEIRA; SANTOS,PÉRSIO DE SOUZA.
Crystalline aluminium hydroxiacetate was prepared by reaction between aluminium powder (ALCOA 123) and aqueous solution of acetic acid at 96ºC ±1ºC. The white powder of Al(OH)(CH3COO)2 is constituted by agglomerates of crystalline plates, having size about 10mum. The crystals were fired from 200ºC to 1550ºC, in oxidizing atmosphere and the products characterized by X-ray diffraction, scanning electron microscopy and surface area measurements by BET-nitrogen method. Transition aluminas are formed from heating at the following temperatures: gamma (300ºC); delta (750ºC); alpha (1050ºC). The aluminas maintain the original morphology of the Al(OH)Ac2 crystal agglomerates, up to 1050ºC, when sintering and coalescence of the alpha-alumina crystals start and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminium hydroxiacetate; Boehmite; Transition aluminas; Active aluminas; Aluminum hydroxides.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400003

Paleolimnological inferences based on Oligocene ostracods (Crustacea: Ostracoda) from Tremembé Formation, Southeast Brazil
Provedor de dados: 42
Autores: BERGUE,CRISTIANINI T.; MARANHÃO,MARIA DA SAUDADE A.S.; FAUTH,GERSON.
Non-marine Oligocene ostracods from Tremembé Formation (Taubaté Basin, Southeast Brazil) are studied for the first time. The study reveals rich assemblages which are probably composed of many new taxa, two of which are described here. The sixteen ostracod species registered are classified in the generaCypretta Vávra, Strandesia Stuhlmann,Potamocypris Brady, Heterocypris Claus,Eucypris Vávra, Herpetocypris Brady and Norman, Cytheridella Daday and LimnocythereBrady. Two new species of the latter are herein proposed: L. mandubi sp. nov. and L. katu sp. nov. The succession of ostracod assemblages along the studied core changes conspicuously in composition, abundance and preservation, and are characterized by the following associations:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ostracods; Paleolimnology; Taxonomy; Tremembé Formation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401531

Productivity and nutritive value of elephant grass pastures under organic and conventional production systems
Provedor de dados: 42
Autores: SIMONETTI,GABRIELA D.; OLIVO,CLAIR J.; SEIBT,DAIANE C.; BRATZ,VINICIUS F.; SAUTHIER,JULIO C.; ADAMS,CARINE B.
Abstract: Elephant grass (EG) (Pennisetum purpureum Schum.) have great importance in tropical and subtropical climates, especially on dairy farms. Normally, EG is established alone under high fertilization levels. EG in organic production system can improve low production costs and environmental issues, are still little known. The aim of this research was to evaluate the performance of herbage yield, nutritive value, extraction/ export nutrient and forage yield and animal responses. Three production systems of EG were analyzed: (i) EG mixed spontaneous-growing species (SGE) in warm-season and ryegrass (R) in cool-season under organic production; (ii) EG mixed SGE + R under conventional system (positive control); and (iii) EG based under conventional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude protein; Dairy cows; Pennisetum purpureum Schum; Production of forage; Stocking rate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300852

Feeding and reproductive patterns of Astyanax intermedius in a headwater stream of Atlantic Rainforest
Provedor de dados: 42
Autores: SOUZA,URSULLA P.; FERREIRA,FABIO C.; CARMO,MICHELE A.F.; BRAGA,FRANCISCO M.S.
ABSTRACT In this paper, we determined diet composition, reproductive periodicity and fecundity of Astyanax intermedius in a headwater stream of a State Park of an Atlantic rainforest. We also evaluated the influence of rainfall, water temperature and fish size on niche width and niche overlap. Sampling was conducted monthly throughout one year in the Ribeirão Grande stream, southeastern Brazil. Diet consisted of 31 food items with equal contribution of allochthonous and autochthonous items. Females were larger than males, and the mean sizes at first maturation were 4.44 cm and 3.92 cm, respectively. Based on 212 pairs of mature ovaries, the number of oocytes per female ranged from 538 to 6,727 (mean = 2,688.7). Niche width and niche overlap were not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae fishes; Niche overlap; Niche width; Spawning type.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502151

Mapping Study on the Use of Digital Games for Persons with Disabilities in Upper Members
Provedor de dados: 42
Autores: FERNANDES,FLÁVIA G.; CARDOSO,ALEXANDRE; LOPES,RENATO A.
Abstract: Digital games are no longer seen as a form of entertainment detrimental to health. They have become an important tool to improve the treatment of patients, ranging from those who are experiencing a serious illness, such as cancer, to those requiring milder procedures such as physiotherapy. However, there are people who are physically disabled and have difficulty playing digital games. In this line of reasoning, this work presents a systematic review on the use of digital games for people with physical disabilities in the upper limbs. The sources of research were the following indexed databases: IEEE Xplore, Portal of Periodicals of the Coordination of Improvement of Personnel of Higher Level (CAPES), PubMed, Scielo, Science Direct, Scopus and Web...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital games; Mapping study; Physical disability; Upper limbs.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300705

Araçatuba Formation: palustrine deposits from the initial sedimentation phase of the Bauru Basin
Provedor de dados: 42
Autores: Fernandes,Luiz A.; Giannini,Paulo C. F.; Góes,Ana Maria.
The Bauru Basin (Upper Cretaceous) accumulated an essentially sandy continental sedimentary sequence. In a first desertic phase the basaltic substratum was covered by a widespread and homogeneous aeolian sand unit with minor loess intercalations. The substratum relief favored the formation of an endorheic drainage system under semi-arid climate, a process that started the development of the Araçatuba Paleoswamp. The palustrine deposits (Araçatuba Formation) comprise siltstone and tipically greenish gray narrow tabular strata of sandstone cemented by carbonate. Moulds and gypsite and dolomite pseudomorphs were identified. The moulds seem to be genetically associated with desiccation cracks, root marks and climbing ripple lamination levels, that, on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araçatuba; Cretaceous; Bauru; Swamp; Palustrine; Continental.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200006

Permian plants from the Chutani Formation (Titicaca Group, Northern Altiplano of Bolivia): II. The morphogenus Glossopteris
Provedor de dados: 42
Autores: Iannuzzi,Roberto; Vieira,Carlos E. L.; Guerra-Sommer,Margot; Díaz-Martínez,Enrique; Grader,George W.
Fossil plants belonging to the morphogenera Glossopteris, Pecopteris and Asterotheca were collected from the upper part of the Chutani Formation (Titicaca Group), near the town of San Pablo de Tiquina, on the southeastern shore of Lake Titicaca (northern Altiplano, Bolivia). This paper presents the first description of specimens of the morphogenus Glossopteris from Bolivia. The Bolivian specimens of Glossopteris consist of poorly-preserved impressions, although they present the diagnostic features of this morphogenus. They are fragments of leaves with secondary veins of taeniopterid-type, typical of glossopterids from Late Permian deposits of Gondwana. The only species of Pecopteris confirmed in the first part of this study, i.e. P. dolianitii Rösler and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altiplano of Bolivia; Permian; Glossopteris; Phytogeography.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100011

Tectonics and paleogeography of the Marajó Basin, northern Brazil
Provedor de dados: 42
Autores: COSTA,JOÃO B. S.; HASUI,YOCITERU; BEMERGUY,RUTH L.; SOARES-JÚNIOR,ADILSON V.; VILLEGAS,JAVIER M. C.
The Marajó Basin area presents geologic and geomorphologic features chiefly due to the Mesozoic extension and post-Miocene neotectonics. The extension event with an Early and a Late Cretaceous phases originated four sub-basins that constitutes the Marajó Basin, with a thick continental clastic sequence showing marine influence. NW and NNW normal faults and NE and ENE strike-slip faults controlled the basin geometry. The extension, related to the Equatorial Atlantic opening, propagated into the continent along crustal weakness zones of the Precambrian Tumucumaque, Amapá and Araguaia orogenic belts. The neotectonic event is a strike-slip regime which developed transtensional basins filled in by Upper Tertiary shallow marine (Pirabas Formation) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marajó Basin; Structure; Evolution; Paleogeography; Geomorphology.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300013

Green-tuff landslide areas are beneficial for rice nutrition in Japan
Provedor de dados: 42
Autores: Tazaki,Kazue.
Japanese Islands are covered with weathered volcanic rocks and soils. Terraced rice field are located in green-tuff areas which are very fertile but where landslides occur associated to strong earthquakes. The Xray diffraction and X-ray fluorescence analyses of the soils in landslide area identified predominant smectite and Mg, Al, Si, K, Ti, Mn and Fe are main components. The rice leaf showed that S, Cl, K and Ca play important roles for nutrients in the area. Drainpipe systems have set up in the green- tuff areas to reduce the risks of landslides. Reddish brown microbial mats inhabited bacteria and diatom in the drainpipe outlets. The microbial mats are rich in Fe and PO4(3-). The iron bacteria in the ground water have a high metabolic rate suggesting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green-tuff; Terraced rice field; Landslide; Microbial materials.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400010

Effects of temperature on the feeding behavior of Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) on Bt and non-Bt cotton plants
Provedor de dados: 42
Autores: RAMALHO,FRANCISCO S.; PACHÚ,JÉSSICA K.S.; LIRA,ALINE C.S.; MALAQUIAS,JOSÉ B.; BRITO,BÁRBARA D.S.; ZANUNCIO,JOSÉ C.; FERNANDES,FRANCISCO S.
ABSTRACT The host acceptance behavior and environmental factors as temperature affect the feeding behavior of Lepidoptera pests. Thus, they must be considered in studies about the risk potential of resistance evolution. The current study sets the differences in the feeding behavior of neonate Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) larvae exposed to Bt and non-Bt cotton plants, under different temperatures and time gap after hatching. Two cotton cultivars were used: the Bt (DP 404 BG - bollgard) and the non-transformed isoline, DP 4049. We found that the feeding behavior of neonate A. argillacea is significantly different between Bt and non-Bt cotton. Based on the number of larvae with vegetal tissue in their gut found on the plant and in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cotton leafworm; Feeding behavior; Transgenic cotton; Blended seed refuge.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602955

Paleoenvironment interpretation of a 1760 years B.P. old sediment in a mangrove area of the Bay of Guanabara, using pollen analysis
Provedor de dados: 42
Autores: Barth,Ortrud M.; São-Thiago,Luiz E.U.; Barros,Marcia A.
A sediment sample was obtained at 122 cm from the top of a drilling core in the Guapimirim mangrove, Bay of Guanabara, and analyzed using pollen analysis. This muddy core reached a sandy ground at 133 cm. 14C datation got the age of 1760 ± 50 years B.P. The most frequent pollen grains were mangrove species of Rhizophora mangle, Laguncularia racemosa and Avicennia schaueriana. "Restinga" and tropical rain forest vegetation was recognized behind the mangrove. After the last sea transgression at 2500 years B.P., the water level lowered to its actual size, allowing the installation of this mangrove.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen; Paleoenvironment; Mangrove; Bay of Guanabara; Rio de Janeiro; 1760 B.P.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200004

Does Evolution matter?: a case study in Brazil of the effects of an evolutionary-thinking academic atmosphere in postgraduate students' belief in God/religious belief
Provedor de dados: 42
Autores: Dias,Ivan A.; Willemart,Rodrigo H.; Marques,Antonio C.
Although the theory of evolution is more than 150 years old, a substantial proportion of the world population does not mention it when explaining the origin of human beings. The usual alternative conception is offered by creationism, one of the main obstacles to full acceptance of evolution in many countries. National polls have demonstrated that schooling and religiosity are negatively correlated, with scientists being one of the least religious professionals. Herein we analyzed both (1) the profile of 1st semester undergraduate students and (2), thesis and dissertations, concerning religious and evolutionary thoughts from Biology and Veterinary Schools at the largest university of South America. We have shown that students of Biology are biased towards...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Creation-evolution controversy; Deism/religiosity; Evolutionism; Postgraduate students.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200023

Timing carbon turnover (δ13C) in weaned piglet’s brain by IRMS
Provedor de dados: 42
Autores: SALEH,MAYRA A.D.; SANTOS,LUAN S. DOS; BERTO,DIRLEI A.; AMORIM,ALESSANDRO B.; COSTA,VLADIMIR E.; DUCATTI,CARLOS.
Abstract Isotope-ratio mass spectrometry (IRMS) is a potential tool that provides time-integrated estimate of assimilated and not just ingested nutrients. This feature turned possible its application to evaluate the effects of dietary nucleotides and glutamate on carbon turnover (δ13C) in the brain of weanling piglets. Eighty-seven piglets weaned at 21-day-old were used, being three piglets slaughtered at day-0 (prior to diet-switch) and, the remaining 84 randomly assigned in a complete block design with a 2 x 2 factorial arrangement of treatments (two nucleotide levels: 0% and 0.1% and, two glutamate levels: 0% and 1%). On trial days 3, 6, 9, 14, 21, 35 and 49, three piglets per treatment were also slaughtered. The samples were analyzed by IRMS and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additives; Amino acids; Isotopic dilution; Stable isotopes; Swine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502469

Candesartan inhibits inflammation through an angiotensin II type 1 receptor independent way in human embryonic kidney epithelial cells
Provedor de dados: 42
Autores: YU,YING; JIANG,HAIFENG; NIU,YANGYANG; ZHANG,XIAOQIN; ZHANG,YINGYING; LIU,XI; QI,TAO; YU,CHEN.
Abstract: Besides stimulating vasoconstriction, Angiotensin II is also well known in inducing reactive oxygen species and promoting inflammatory phenotype switch via its type 1 receptor. In clinic, Angiotensin II type 1 (AT1) receptor blocker like candesartan has been widely applied as an antihypertensive medication. We previous have demonstrated that a higher dose of candesartan plays a protective role after kidney injury. However, whether candesartan could exhibit anti-inflammatory effects remains unclear. Here, by stimulating isolated human embryonic kidney epithelial cells with tumor necrosis factor-α (TNF-α), we observed the anti-inflammation capacity of candesartan ex vivo. It was found that pre-treat with candesartan significantly suppressed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angiotensin II type 1 receptor blockers; Candesartan; Inflammation; Reactive oxygen species.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300701

Synthesis and immunological activity of a branched peptide construction carrying the T cell epitope of Paracoccidioides brasiliensis major exocellular antigen, the gp43
Provedor de dados: 42
Autores: Travassos,L. R.; Nakaie,C. R.; Cilli,E. M.; Taborda,C. P.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100018

Morphological and morphometric variations of Dicrocoelium rileyi (Digenea: Dicrocoelidae) parasitizing Tadarida brasiliensis (Chiroptera: Molosiidae) in Mexico
Provedor de dados: 42
Autores: FALCÓN-ORDAZ,JORGE; OCTAVIO-AGUILAR,PABLO; ESTRELLA-CRUZ,ISABEL.
Abstract:  Fifty-five adult Dicrocoelium rileyiMacy, 1931 parasitizing Tadarida brasiliensis (Geoffroy, 1824) from Durango, Nuevo Leon, Puebla, Zacatecas and Mexico State were morphologically described and morphometrically analyzed. To evaluate the degree of variation among populations from the five localities, 27 morphometric measures of this species were transformed into an orthogonal factor by principal component analysis (PCA), and a posterior comparison among populations was performed using discriminant analysis of principal components (DAPC). Significant differences were observed with exceptions between the Puebla – Zacatecas and Nuevo Leon – Mexico State populations when forming three groups with an 88 % assignation. The Durango population was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bats; Platyhelminthes; Interlocal variability; Multivariate analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700609

Effect of land use on mayfly assemblages structure in Neotropical headwater streams
Provedor de dados: 42
Autores: SIEGLOCH,ANA EMILIA; SURIANO,MARCIA; SPIES,MARCIA; FONSECA-GESSNER,ALAÍDE.
The aim of this study was to test the effect of agricultural and forestry land use on the structure of mayfly assemblages in low-order streams. Twenty-nine headwater streams were investigated in the state of São Paulo. We analyzed 15 streams in pristine areas (mixed tropical rainforest, semideciduous forest and dense tropical rainforest), and 14 streams covered with sugarcane, eucalyptus and pasture. Mayfly richness obtained by rarefaction curves was higher in pristine areas (21 genera), especially in mixed and semideciduous forest when compared to land use (9 genera), where values were particularly low in sugarcane plantation (3 genera). The non-metric multidimensional scaling (NMDS) ordination showed clear difference in mayfly assemblages between land...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Environmental integrity; Ephemeroptera; Richness; Aquatic insects.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401735

An integrated approach clarifies the cryptic diversity in Hypostomus Lacépède 1803 from the Lower La Plata Basin
Provedor de dados: 42
Autores: CARDOSO,YAMILA P.; BRANCOLINI,FLORENCIA; PROTOGINO,LUCILA; PARACAMPO,ARIEL; BOGAN,SERGIO; POSADAS,PAULA; MONTOYA-BURGOS,JUAN I.
Abstract Abstract: Hypostomus commersoni Valenciennes 1836, Hypostomus cordovae (Günther 1880) and Hypostomus laplatae (Eigenmann 1907) have been little studied since their original descriptions. This study shows a comprehensive review of these species from the Lower La Plata Basin, including their taxonomic history, distribution, color patterns, morphology, and ecological and molecular phylogenetic data. Morphological and phylogenetic analyses based on D-loop sequences suggested that H. commersoni can be separated into two subclades, or subgroups. Based on these results and on the non-overlapping distribution range of the two subclades, we conclude that they represent two distinct species, thereby revalidating H. spiniger. The results also suggest that H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Brazil; Freshwater fishes; Molecular phylogenetics; Paraná Basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300604

Phytoplankton community of Reis lake in the Brazilian Amazon
Provedor de dados: 42
Autores: SILVA,ISE G.; MOURA,ARIADNE N.; DANTAS,ENIO W.
Reis Lake is located in the municipality of Caracaraí, state of Roraima (Brazil) and is subject to fluctuations in water level. The aim of this study was to analyze the structure of the phytoplankton community on the nictemeral and seasonal scales and determined the influence of limnological variables. Sampling was performed in the rainy season (June/2006) and dry season (November/2006), considering two nictemeral cycles. The phytoplankton community was assessed with regard to composition and density, abiotic variables were analyzed simultaneously. The lake had low concentrations of oxygen, clinograde profile and water stratified during the day and homogenous at night, with low concentrations of nutrients and waters ranging from slightly acidic to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoplankton; Nictemeral; Floodplain; Seasonal; State of Roraima.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200649

Biological variables of Hypostomus francisci (Siluriformes: Loricariidae) from Itapecerica River, Minas Gerais State, Brazil
Provedor de dados: 42
Autores: SALES,CAMILA F.; DOMINGOS,FABRÍCIO FLÁVIO T.; BRIGHENTI,LUDMILA S.; RIBEIRO,ROSY I.M.A.; SANTOS,HÉLIO B.; THOMÉ,RALPH G.
ABSTRACT Herein we determine for the first time the reproduction parameters and population structure of Hypostomus francisci in the Itapecerica River, São Francisco Basin. A total of 250 specimens was captured quarterly between March 2010 and February 2012. Body weight, total length and weight of the gonads were obtained in the laboratory. Gonad samples were submitted to histological and histochemical techniques. Females with spawning capable ovaries were used to determine the fecundity and relative fecundity. Sex ratio with 1:1.01 (female:male) was observed. Males were more numerous than females for individuals smaller than 170 mm, however the number of females was significantly greater for specimens larger than 330 mm. The length-weight relationship...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fecundity; Gametogenesis; Neotropical freshwater fish; Population structure; Reproduction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501603

Isolation and HPLC quantitation of kaurane-type diterpenes and cinnamic acid derivatives of long-term stored leaves of Mikania laevigata and Mikania glomerata
Provedor de dados: 42
Autores: BERTOLUCCI,SUZAN K.V.; PEREIRA,ANA B.D.; PINTO,JOSE E.B.P.; OLIVEIRA,ALAIDE B.; BRAGA,FERNAO C.
The leaves of Mikania laevigata and Mikania glomerata are used in Brazil to treat respiratory affections, being kaurane-type diterpenes and coumarin considered as the bioactive compounds. The present study reports an investigation on the HPLC-DAD profiles and contents of coumarin (1), trans-o-coumaric (2), kaurenoic (3), benzoylgrandifloric (4) and cinnamoylgrandifloric (5) acids in dried leaves of Mikania species stored in dark room under controlled conditions. Excepting 2, the constituents were isolated and purified to be employed as reference compounds. The samples were analyzed at three monthly intervals up to 18 months for M. laevigata and 12 months for M. glomerata. trans-o-Coumaric was not detected in both, whereas 1 occurred only in M. laevigata....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical markers changes; HPLC-DAD analysis; Mikania laevigata; Mikania glomerata; Storage; Post-harvest.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200473

Propagation of vibrational modes in classical harmonic lattice with correlated disorder
Provedor de dados: 42
Autores: SILVA,LEONADE D. DA; RANCIARO NETO,ADHEMAR; SALES,MESSIAS O.; SANTOS,JOSÉ L.L. DOS; MOURA,FRANCISCO A.B.F. DE.
Abstract: The vibrational modes with nonzero frequency are localized in harmonic lattice with disordered masses. In our work, we investigated numerically the propagation of vibrational energy in harmonic lattice with long-range correlated disordered masses, which are randomly distributed with power law spectrum   S ( k ) ∝  k  − α. For α = 0, a standard uncorrelated disordered mass distribution was observed and for α &gt; 0 its distribution exhibits intrinsic long-range correlations. Our procedure was done by the numerical solution of the classical equations for the mass displacement and velocities. Energy flow was investigated after injection of an initial wave-packet with energy E0 and the dynamics of the vibrational energy wave-packet was analyzed. We...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Localization; Correlated disorder; Anderson localization; Harmonic lattice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300302

Ameliorative potential of Butea monosperma on chronic constriction injury of sciatic nerve induced neuropathic pain in rats
Provedor de dados: 42
Autores: Thiagarajan,Venkata R.K.; Shanmugam,Palanichamy; Krishnan,Uma M.; Muthuraman,Arunachalam; Singh,Nirmal.
The present study was designed to investigate the ameliorative role of ethanolic extract from leaves of Butea monosperma in chronic constriction injury (CCI) of sciatic nerve induced neuropathic pain in rats. Hot plate, acetone drop, paw pressure, Von Frey hair and tail immersion tests were performed to assess the degree of thermal hyperalgesia, cold chemical allodynia, mechanical hyperalgesia &amp;amp; allodynia in the left hind paw and tail thermal hyperalgesia. Further on, thiobarbituric acid reactive substances (TBARS), reduced glutathione (GSH) and total calcium levels were estimated to assess the biochemical changes in the sciatic nerve tissue. Histopathological changes were also observed in the sciatic nerve tissue. Ethanolic extract of Butea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-oxidant; Butea monosperma; Calcium; Chronic constriction injury; Reduced glutathione; Thiobarbituric acid reactive substance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400023

Geochemistry of acid mine drainage from a coal mining area and processes controlling metal attenuation in stream waters, southern Brazil
Provedor de dados: 42
Autores: CAMPANER,VERIDIANA P.; LUIZ-SILVA,WANILSON; MACHADO,WILSON.
Acid drainage influence on the water and sediment quality was investigated in a coal mining area (southern Brazil). Mine drainage showed pH between 3.2 and 4.6 and elevated concentrations of sulfate, As and metals, of which, Fe, Mn and Zn exceeded the limits for the emission of effluents stated in the Brazilian legislation. Arsenic also exceeded the limit, but only slightly. Groundwater monitoring wells from active mines and tailings piles showed pH interval and chemical concentrations similar to those of mine drainage. However, the river and ground water samples of municipal public water supplies revealed a pH range from 7.2 to 7.5 and low chemical concentrations, although Cd concentration slightly exceeded the limit adopted by Brazilian legislation for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid mine drainage; Coal; Metals; Water quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200539

A New Acetylcholinesterase Inhibitor from Green Glycosylation of Trachyloban-19-oic Acid by Mucor plumbeus
Provedor de dados: 42
Autores: SANTOS,GABRIEL F. DOS; TAKAHASHI,JACQUELINE A.
ABSTRACT The in vitro metabolism of a widespread natural product, trachyloban-19-oic acid (1), by the fungal species Mucor plumbeus was studied in a sucrose-yeast liquid medium. Two products were isolated, and their structures were determined by spectroscopic means as 7β-hydroxytrachyloban-19-oic acid (5) and trachyloban-19-O-β-D-glucopyranosyl ester (6). To the best of our knowledge, compound 6 is herein reported by the first time in the literature. These compounds were assayed for acetylcholinesterase inhibition along with some related compounds. Compound 6 showed the highest acetylcholinesterase inhibitory activity at 10000 µg/mL among the tested compounds, a result (92.89%) comparable to the activity of the positive control, galanthamine (94.21%)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase inhibitors; Biotransformation; Green glycosylation; Mucor plumbeus; Trachyloban-19-oic acid.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000501961

From Gene Targeting to Genome Editing: Transgenic animals applications and beyond
Provedor de dados: 42
Autores: ROCHA-MARTINS,MAURÍCIO; CAVALHEIRO,GABRIEL R.; MATOS-RODRIGUES,GABRIEL E.; MARTINS,RODRIGO A.P.
ABSTRACTGenome modification technologies are powerful tools for molecular biology and related areas. Advances in animal transgenesis and genome editing technologies during the past three decades allowed systematic interrogation of gene function that can help model how the genome influences cellular physiology. Genetic engineering via homologous recombination (HR) has been the standard method to modify genomic sequences. Nevertheless, nuclease-guided genome editing methods that were developed recently, such as ZFN, TALEN and CRISPR/Cas, opened new perspectives for biomedical research. Here, we present a brief historical perspective of genome modification methods, focusing on transgenic mice models. Moreover, we describe how new techniques were discovered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homologous recombination; DNA repair; Cre-LoxP; ZFN; TALEN; CRISPR/Cas9.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301323

Primary and secondary thickening in the stem of Cordyline fruticosa (Agavaceae)
Provedor de dados: 42
Autores: Cattai,Marina B.; Menezes,Nanuza L. de.
The growth in thickness of monocotyledon stems can be either primary, or primary and secondary. Most of the authors consider this thickening as a result of the PTM (Primary Thickening Meristem) and the STM (Secondary Thickening Meristem) activity. There are differences in the interpretation of which meristem would be responsible for primary thickening. In Cordyline fruticosa the procambium forms two types of vascular bundles: collateral leaf traces (with proto and metaxylem and proto and metaphloem), and concentric cauline bundles (with metaxylem and metaphloem). The procambium also forms the pericycle, the outermost layer of the vascular cylinder consisting of smaller and less intensely colored cells that are divided irregularly to form new vascular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pericycle; Collateral leaf traces; Concentric cauline bundles.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300013

Cytotoxicity and bacterial membrane destabilization induced by Annona squamosa L. extracts
Provedor de dados: 42
Autores: PINTO,NÍCOLAS C.C.; SILVA,JUCÉLIA B.; MENEGATI,LAURA M.; GUEDES,MARIA CLARA M.R.; MARQUES,LUCAS B.; SILVA,THIAGO P. DA; MELO,ROSSANA C.N. DE; SOUZA-FAGUNDES,ELAINE M. DE; SALVADOR,MARCOS J.; SCIO,ELITA; FABRI,RODRIGO L.
ABSTRACT This study aimed to further investigate the cytotoxicity against tumor cell lines and several bacterial strains of Annona squamosa and its mode of action. Methanol extracts of A. squamosa leaves (ASL) and seeds (ASS) were used. ASL showed significant antibacterial activity against S. aureus, K. pneumoniae and E. faecalis with MIC values of 78, 78 and 39 µg/mL respectively. Moreover, ASL exhibited significant biofilm disruption, rapid time dependent kinetics of bacterial killing, increased membrane permeability and significantly reduced the cell numbers and viability. Regarding the cytotoxicity against tumor cell lines, ASS was more active against Jurkat and MCF-7 cells, with CI50 1.1 and 2.1 µg/mL, respectively. ASL showed promising activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkaloids; Annona squamosa; Antibacterial; Citotoxicity; Herbal medicine.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502053

Rheological and some physicochemical characteristics of selected floral honeys from plants of caatinga
Provedor de dados: 42
Autores: SANTOS,FRANCISCO K.G.; DANTAS FILHO,ANTONIO N.; LEITE,RICARDO H.L.; AROUCHA,EDNA M.M.; SANTOS,ANDARAIR G.; OLIVEIRA,THIAGO A.
The aim of this paper was to investigate the physicochemical characteristics and rheological behavior of some floral honeys from species of wild plants found in the Caatinga biome, as well as, correlate honey viscosities with its chemical composition. Thus, five honeys with floral predominance of typical plants foraged by honeybees in Caatinga were analyzed. Results showed that moisture content of honeys ranged from 17.45 to 21.50 g/100g. The samples exhibited higher fructose content (37.58 - 43.95 g/100g) and lower glucose content (27.41- 33.80 g/100g). The glucose-water ratio ranged from 1.55 to 1.80. Sucrose contents, excluding Croton campestris honey sample, exhibited values above the highest sucrose content (6.0 g/100g) allowed by Brazilian norm. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arrhenius model; Glucose; Moisture; Rheology; Viscosity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200981

Probiotics prevent growth deficit of colon wall strata of malnourished rats post-lactation
Provedor de dados: 42
Autores: Lima,Dirlene P.; Azevedo,Jorge F. de; Hermes-Uliana,Catchia; Alves,Gilberto; Sant'ana,Débora M.G.; Araújo,Eduardo J.A.
The objective of this study was to analyze morphometrically the colon wall strata of malnourished rats supplemented with probiotics. Sixteen recently weaned Wistar rats (Rattus norvegicus) were distributed into four groups: animals that received commercial chow (G1, n = 4); animals that received the same feed as G1 and were supplemented with probiotics (G2, n = 4); animals that received chow with 4% of proteins (G3, n = 4); animals that received the same feed as G3 and were supplemented with probiotics (G4, n = 4). After 12 weeks, the proximal colon was collected and submitted to histological processing. Three-µm cuts were stained with H.E., Periodic Acid Schifff (P.A.S.) + diasthasis solution and Alcian Blue (A.B.) pH 2.5 and pH 1.0. The morphometric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Histology; Large intestine; Malnourishment; Morphometry; Probiotics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300015

Dynamic Analysis of the Temperature and the Concentration Profiles of an Industrial Rotary Kiln Used in Clinker Production
Provedor de dados: 42
Autores: RODRIGUES,DIULIA C.Q.; SOARES JUNIOR,ATÍLIO P.; COSTA JUNIOR,ESLY F.; COSTA,ANDRÉA O.S.
ABSTRACT Cement is one of the most used building materials in the world. The process of cement production involves numerous and complex reactions that occur under different temperatures. Thus, there is great interest in the optimization of cement manufacturing. Clinker production is one of the main steps of cement production and it occurs inside the kiln. In this paper, the dry process of clinker production is analysed in a rotary kiln that operates in counter flow. The main phenomena involved in clinker production is as follows: free residual water evaporation of raw material, decomposition of magnesium carbonate, decarbonation, formation of C3A and C4AF, formation of dicalcium silicate, and formation of tricalcium silicate. The main objective of this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clinker; Dynamic analysis; Mathematical modelling; Rotary kiln.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603123

Pampean lizard assemblage from subtropical Brazil: a temporal analysis
Provedor de dados: 42
Autores: Winck,Gisele R.; Santos,Tiago G. Dos; Cechin,Sonia Z.
The increasing human occupation of natural environments is one of the greatest threats to biodiversity. To mitigate the negative anthropogenic effects, it is necessary to understand the characteristics of natural populations and the natural history of species. A study was conducted with an assemblage of lizards from a disturbed area of the Pampa biome, from February 2001 to January 2004. The assemblage showed a unimodal seasonal pattern, with the recruitment period occurring during the warmer months. The captures were seasonal for two of the three monitored years, and concentrated within warmer months. The minimum temperature explained the number of catches for the assemblage as a whole. However, when the species were analyzed individually, the temperature...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grassland; Activities pattern; Seasonality; Reptiles; Unimodal pattern.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400021

A bone fragment of a probable aquatic vertebrate in the Serra Alta Formation (upper permian of Paraná Basin)
Provedor de dados: 42
Autores: HACHIRO,JORGE; GIANNINI,PAULO C.F.; KINJO,RENATA N.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300024

Communication by unvoiced speech: the role of whispering
Provedor de dados: 42
Autores: Cirillo,Jasmin.
Most studies on whispering deal with its production and perception, neglecting its communicative role. I have focused on this, especially some social and psychobiological objectives. I have combined a general inquiry into the use of unvoiced speech with stimulus-response experiments on particular signal properties. (1) Analyses of answers to queries revealed that judgments about whispering depend on the social contexts. In the private domain it plays a clearly positive role, but in the public domain it is more problematical. Two causative factors were identified as relevant: (a) an 'ingroup' function of whispering which could induce negative 'outgroup' effects in co-listeners, and (b) a psychobiological component of whispering which could affect the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Verbal communication; Whispering; Unvoiced speech; Ingroup-signal; Vigilance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200034

On four dimensional Dupin hypersurfaces in Euclidean space
Provedor de dados: 42
Autores: RIVEROS,CARLOS M. C.; TENENBLAT,KETI.
Dupin hypersurfaces in five dimensional Euclidean space parametrized by lines of curvature, with four distinct principal curvatures, are considered. A generic family of such hypersurfaces is locally characterized in terms of the principal curvatures and four vector valued functions of one variable. These functions are invariant by inversions and homotheties.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dupin hypersurfaces; Laplace invariants; Lines of curvature; Principal curvatures.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100001

Ubiquitous overexpression of a transgene encoding the extracellular portion of the Drosophila Roughest-Irregular Chiasm C protein induces early embryonic lethality
Provedor de dados: 42
Autores: MODA,LIVIA; MACHADO,RICARDO C.; RAMOS,RICARDO GUELERMAN P.
The cell adhesion molecule Rst-irreC is a transmembrane glycoprotein of the immunoglobulin superfamily involved in several important developmental processes in Drosophila, including axonal pathfinding in the optic lobe and programmed cell death and pigment cell differentiation in the pupal retina. As an initial step towards the "in vivo'' functional analysis of this protein we have generated transgenic fly stocks carrying a truncated cDNA construct encoding only the extracellular domain of Rst-IrreC under the transcriptional control of the heat shock inducible promoter hsp70. We show that heat-shocking embryos bearing the transgene during the first 8hs of development lead to a 3-4 fold reduction in their viability compared to wild type controls. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Transgenic organisms; Cell adhesion; Immunoglobulin superfamily.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300011

The role of cyclooxygenase-2 on endurance exercise training in female LDL-receptor knockout ovariectomized mice
Provedor de dados: 42
Autores: OLIVEIRA,FLAVIA DE; MAIFRINO,LAURA B.M.; JESUS,GUSTAVO P.P. DE; CARVALHO,JULIANA G.; MARCHON,CLÁUDIA; RIBEIRO,DANIEL A.
Estrogen deprivation in postmenopausal women increases cardiovascular risk. Cardiovascular risk as a result of atherosclerosis is able to induce an inflammatory disease as far as cyclooxygenase-2 ( COX-2) expression. The purpose of the study was to investigate the role of COX-2 on exercise training in female mice low-density lipoprotein receptor knockout ( LDL-KO) with or without ovariectomy. A total of 15 female C57BL/6 mice and 15 female LDL-KO mice were distributed into 6 groups: sedentary control, sedentary control ovariectomized, trained control ovariectomized, LDL-KO sedentary, LDL-KO sedentary ovariectomized and LDL-KO trained ovariectomized. The ascending part of the aorta was stained with H&amp;E and COX-2 expression was assessed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atherosclerosis; Ciclooxygenase-2; Exercise; Menopause.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301157

Finite approximate controllability for semilinear heat equations in noncylindrical domains
Provedor de dados: 42
Autores: Menezes,Silvano B. de; Limaco,Juan; Medeiros,Luis A.
We investigate finite approximate controllability for semilinear heat equation in noncylindrical domains. First we study the linearized problem and then by an application of the fixed point result of Leray-Schauder we obtain the finite approximate controllability for the semilinear state equation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat operator; Finite approximate controllability; Leray-Schauder fixed point; Non-cylindrical.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300002

Protocol for chromosome-specific probe construction using PRINS, micromanipulation and DOP-PCR techniques
Provedor de dados: 42
Autores: PASSAMANI,PAULO Z.; CARVALHO,CARLOS R.; SOARES,FERNANDA A.F.
ABSTRACT Chromosome-specific probes have been widely used in molecular cytogenetics, being obtained with different methods. In this study, a reproducible protocol for construction of chromosome-specific probes is proposed which associates in situ amplification (PRINS), micromanipulation and degenerate oligonucleotide-primed PCR (DOP-PCR). Human lymphocyte cultures were used to obtain metaphases from male and female individuals. The chromosomes were amplified via PRINS, and subcentromeric fragments of the X chromosome were microdissected using microneedles coupled to a phase contrast microscope. The fragments were amplified by DOP-PCR and labeled with tetramethyl-rhodamine-5-dUTP. The probes were used in fluorescent in situ hybridization (FISH) procedure to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DOP-PCR; FISH; Micromanipulation; PRINS.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100041

Taxonomic and non-taxonomic responses of benthic macroinvertebrates to metal toxicity in tropical reservoirs. The case of Cantareira Complex, São Paulo, Brazil
Provedor de dados: 42
Autores: BEGHELLI,FREDERICO G.S.; CETRA,MAURÍCIO; MARCHESE,MERCEDES; LÓPEZ-DOVÁL,JÚLIO CÉSAR; ROSA,ANDRÉ H.; POMPÊO,MARCELO L. M.; MOSCHINI-CARLOS,VIVIANE.
Abstract  Benthic macroinvertebrates are organisms that are recognized as water quality bio-indicators. A wide variety of indices and metrics have been shown to respond to a variety of anthropogenic impacts, usually under a general condition of environmental impairment. The absence of a clear distinction in the relations between specific pollutants and biotic variables is very common and can lead to biased interpretation of biomonitoring. The aims of this research were to test taxonomic and non-taxonomic responses to specific environmental conditions instead to general conditions. For this purpose, we estimated the theoretical toxicity by comparing toxicity values published by EPA with metal concentrations in water and sediments. Then we tested the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bio-indicator; Biomonitoring; Chironomid; Oligochaetes; Toxicity; Metal.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300701

Use of a mathematical model to estimate the impact of shrimp pen culture at Patos Lagoon estuary, Brazil
Provedor de dados: 42
Autores: POERSCH,LUÍS H.; MILACH,ÂNGELA M.; CAVALLI,RONALDO O.; WASIELESKY,WILSON JR.; MÖLLER,OSMAR; CASTELLO,JORGE P.
Ecological modeling has been used as a tool to estimate potential impacts caused by aquaculture to the surrounding environment. In this work, a mathematical model was applied to estimate the maximum amount of pink shrimp (Farfantepenaeus paulensis) culture units (3,100m2 pen enclosures) that could be installed at two shallow estuarine bays of Patos Lagoon (known as Coreia and Porto do Rei) with no significant effects on either water quality or viability of the culture system. To calibrate the model, information about the culture of Litopenaeus vannamei and F. paulensis as well as field data (influence of netting material, water current speed and nitrogen concentrations) were used. Under a bad scenario (water current velocity of 0.01m s–1 and a mesh...
Palavras-chave: Nitrogen; Pen shrimp culture; Sustainability; Ecological modeling; Coastal management.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301063

Mineral chemistry of tantalate species new in the Borborema Pegmatitic Province, Northeast Brazil
Provedor de dados: 42
Autores: Beurlen,Hartmut; Soares,Dwight R.; Thomas,Rainer; Prado-Borges,Lucila E.; Castro,Cláudio de.
Tantalate samples, supposedly of the columbite group, were collected in the Borborema Pegmatitic Province, aiming to test the Mn/(Mn+Fe) and Ta/(Ta+Nb) ratios as geochemical indicators of pegmatite fractionation. Surprisingly, preliminary microprobe data allowed recognizing some species, so far unknown in the Province, namely titanian ixiolite, fersmite, brannerite, strüverite, natrobistantite, plumbo- and stibiomicrolite, plumboand uranpyrochlore. The identification of these exotic tantalates with unusual composition, in addition to its distribution in several pegmatites, far from the classical Alto do Giz and Seridozinho pegmatites, indicate that the elevated degree of fractionation is not restricted to these two occurrences but may be reached in other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Titanian ixiolite; Fersmite; Brannerite; Strüverite; Niobium-tantalates; Pegmatites; Northeast Brazil.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100013

Amylin induces hypoglycemia in mice
Provedor de dados: 42
Autores: Guerreiro,Luiz H.; Silva,Daniel DA; Sola-Penna,Mauro; Mizurini,Daniella M.; Lima,Luís M.T.R.
Amylin is a 37-aminoacid pancreatic protein that exerts control over several metabolic events such as glycemia and lacticemia. Amylin has long been shown to induce increases in arterial plasma glucose. We decided to investigate whether amylin plays additional roles in the glucose metabolism. We evaluated glucose homeostasis using whole blood from the tail tip of fasting, conscious, unrestrained normal and streptozotocyn-induced diabetic mice following subcutaneous administration of mouse amylin. Subcutaneous injection of 1 μg mouse amylin caused a transient decrease in whole blood glucose in both normal and diabetic mice in the absence of insulin. The blood glucose levels were lowest approximately 2 hours after amylin administration, after that they...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylin; Islet associated polypeptide; Glycemia; Diabetes; Mice; Hypoglycemia.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100349

Sm-Nd isotopic data for metabasic rocks in central Brazil: constraints for the timing of mafic magmatism and regional magmatism
Provedor de dados: 42
Autores: PIMENTEL,MÁRCIO M.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300038

Free phenolic compounds extraction from Brazilian halophytes, soybean and rice bran by ultrasound-assisted and orbital shaker methods
Provedor de dados: 42
Autores: SOUZA,MANUEL M. DE; SILVA,BIBIANA DA; COSTA,CÉSAR S.B.; BADIALE-FURLONG,ELIANA.
Abstract  In several countries halophytes are commercially cultivated in low saline or even irrigated with seawater, as well as with saline aquaculture effluent, like a sea asparagus Sarcocornia ambigua, that show a biotechnological potential for bioactive compounds production. However, their recovery from matrix is sometimes inefficient because the lignocellulosic materials difficult the solvent action when drastic conditions are not applied. The ultrasound-assisted extraction (UAE) was optimized by a central composite rotational design for recovery free phenolic compounds (FPC) from the sea asparagus S. ambigua. Optimum conditions were validated and compared with orbital shaker extraction for S. ambigua, other Brazilian halophytes (Apium graveolens,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sea asparagus; Celery; Brazilian pepper; Sea water crops.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703363

Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses
Provedor de dados: 42
Autores: PáDUA,MARLÚCIA S.; PAIVA,LUCIANO V.; LABORY,CLAÚDIA R.G.; ALVES,EDUARDO; STEIN,VANESSA C.
ABSTRACTOil palm is one of the most economically valuable oil seed plants, but the expansion of plantations has been limited by availability of seedlings, as the conventional propagation is through seeds, which have low germination rates. One possible solution for the large-scale production is the use of somatic embryogenesis. The aim of this study was evaluate the effects auxins 2,4-D and picloram on the induction of pro-embryogenic masses inE.guineenesis hybrid leaf explants and characterize, regarding embryogenic characteristics, with cytochemical and ultrastructural analisys. Specifically, in vitro plantlets leaves fragments were inoculated in Y3 culture medium supplemented by 2.4-D or picloram at different concentrations (0.0, 1.0, 3.0, 6.0 and 9.0 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryogenic potential; Growth regulators; Tissue culture; Transmission electron microscopy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401545

Unenlagiinae revisited: dromaeosaurid theropods from South América
Provedor de dados: 42
Autores: Gianechini,Federico A.; Apesteguia,Sebastian.
Over the past two decades, the record of South American unenlagiine dromaeosaurids was substantially increased both in quantity as well as in quality of specimens. Here is presented a summary review of the South American record for these theropods.Unenlagia comahuensis, Unenlagia paynemili, and Neuquenraptor argentinus come from the Portezuelo Formation, the former genus being the most complete and with putative avian features. Neuquenraptor is more incomplete and exhibits pedal features resembling those of Unenlagia. The earliest and most complete South American dromaeosaurid is Buitreraptor gonzalezoru, whose preserved cranial remains, provides important data in the characterization of unenlagiines. The most recently described,Austroraptor cabazai also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deinonychosauria; Droaeosauridae; South América; Unenlagiinae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100009

Extreme cultural persistence in eastern-central Brazil: the case of Lagoa Santa Paleaeoindians
Provedor de dados: 42
Autores: ARAUJO,ASTOLFO G.M.; PUGLIESE JR.,FRANCISCO A.; SANTOS,RAFAEL O. DOS; OKUMURA,MERCEDES.
ABSTRACT Lapa do Santo rockshelter, a Paleoindian site located in Eastern-Central Brazil, presented two main occupations; one during Early Holocene (12,460 to 8700 cal BP), and a latter in Middle Holocene (5100 to 4200 cal BP). In spite of this 3600 year gap, the stratigraphy and general characteristics of the material culture did not indicate any visible discontinuity. This led us to hypothesise a reoccupation of the rockshelter by the same cultural group, tested by means of statistical analyses comparing lithics, bone artifacts, and faunal remains from early and middle Holocene layers. No significant differences were found, and our results indicate the presence of a cultural tradition that persisted for 8240 years, or roughly 412 generations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultural persistence; Cultural transmission; Lithic technology; Zooarchaeology; Paleoindian; South America.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502501

Positive inversion of extensional footwalls in the southern Serra do Espinhaço, Brazil - insights from sandbox laboratory experiments
Provedor de dados: 42
Autores: Gomes,Caroline J.S.; Martins-Neto,Marcelo A.; Ribeiro,Valéria E.
Analogue experiments were carried out to get insights into the processes governing positive inversion during the foreland propagating thrust tectonics in the southern Serra do Espinhaço, a Brasiliano/Panafrican foldthrust belt in southeast Brazil. In particular, model listric half-grabens were inverted by applying contractional displacement to the footwall blocks. We investigated two different inversion conditions in listric half-grabens: (i) extensional and contractional detachments at the same level and (ii) at different positions. The models revealed that the development of a forward-breaking thrust system occurs in the basin synrift deposits, by contractional translation of the extensional footwall block when the extensional and contractional master...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental modeling; Inversion tectonics; Footwall block; Espinhaço Basin; Different detachment levels.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200012

Significance and genetic interpretation of the sequential organization of the aptian-albian lacustrine system of the Araripe basin
Provedor de dados: 42
Autores: Neumann,Virgínio H.; Cabrera,Lluis.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400030

New seminal variety of Stevia rebaudiana: Obtaining fractions with high antioxidant potential of leaves
Provedor de dados: 42
Autores: MILANI,PAULA G.; FORMIGONI,MAYSA; DACOME,ANTONIO S.; BENOSSI,LIVIA; COSTA,CECÍLIA E.M. DA; COSTA,SILVIO C. DA.
ABSTRACT The aim of this study was to determine the composition and antioxidant potential of leaves of a new variety of Stevia rebaudiana (Stevia UEM-13). Stevia leaves of UEM-13 contain rebaudioside A as the main glycoside, while most wild Stevia plants contain stevioside. Furthermore can be multiplied by seed, which reduces the cost of plant culture techniques as other clonal varieties are multiplied by buds, requiring sophisticated and expensive seedling production systems. Ethanol and methanol were used in the extraction to determine the bioactive compounds. The methanolic extract was fractionated sequentially with hexane, chloroform, ethyl acetate and isobutanol, and the highest concentration of phenolic compounds and flavonoids was obtained in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactive compounds; Glycosides; Leaf extracts; Phenolic compounds; New cultivar of Stevia.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401841

A comparative study of phytoconstituents and antibacterial activity of in vitro derived materials of four Passiflora species
Provedor de dados: 42
Autores: J. SIMÃO,MARIELA; J.S. BARBOZA,THIAGO; G. VIANNA,MARCELA; GARCIA,RENATA; MANSUR,ELISABETH; P.R. IGNACIO,ANA CLAUDIA; PACHECO,GEORGIA.
Abstract Passiflora species are well known for their common use in popular medicine for the treatment of several diseases, such as insomnia, anxiety, and hysteria, in addition to their anti-inflammatory, antioxidant, analgesic and antibacterial potential. However, few data about the chemical composition and the medicinal potential of in vitro derived materials are available. Therefore, the goal of this work was to compare, for the first time, the phytoconstituents of in vitro derived materials of four Passiflora species, and evaluate the antibacterial potential of their extracts against 20 Gram-positive and negative strains. Chromatographic analysis indicated the presence of saponins in roots extracts from all studied species, whereas leaf extracts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial; Chromatography; Flavonoids; Passiflora; Saponins.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602805

Hydrodynamics of the Amazon basin
Provedor de dados: 42
Autores: SABATÉ,PIERRE.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300050

A taxonomic bibliography of the South American snakes of the Crotalus durissus complex (Serpentes, Viperidae)
Provedor de dados: 42
Autores: VANZOLINI,PAULO E.; CALLEFFO,MYRIAM E.V.
A survey is made of the taxonomic literature on South American rattlesnakes (genus Crotalus, family Viperidae). Two main areas are emphasized: the attribution of the names proposed in the eighteenth century by Linnaeus and Laurenti, and the current scheme of division in subspecies. The attribution of names is examined based on the original descriptions and on relevant previous and contemporary literature. The presently adopted scheme, proposed by Klauber (1941, 1972) is found not entirely satisfactory, but reasonable enough - besides being hallowed by use. The scheme of geographical differentiation, intrinsically important and with broad practical implications (differentiation of the venom) is found to be the culmination of a long series of deficient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalus durissus; Viperidae; Geographical differentidation; Differentiation of the venom.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100005

Hydrocarbons in carbonate rocks of the Neoproterozoic Alto Paraguai basin, Mato Grosso, Brazil
Provedor de dados: 42
Autores: NOGUEIRA,AFONSO C. R.; RICCOMINI,CLAUDIO; KERKIS,ALEXEI; FAIRCHILD,THOMAS R.; HIDALGO,RENATA L.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300018

Objective and subjective prior distributions for the Gompertz distribution
Provedor de dados: 42
Autores: MOALA,FERNANDO A.; DEY,SANKU.
Abstract This paper takes into account the estimation for the unknown parameters of the Gompertz distribution from the frequentist and Bayesian view points by using both objective and subjective prior distributions. We first derive non-informative priors using formal rules, such as Jefreys prior and maximal data information prior (MDIP), based on Fisher information and entropy, respectively. We also propose a prior distribution that incorporate the expert’s knowledge about the issue under study. In this regard, we assume two independent gamma distributions for the parameters of the Gompertz distribution and it is employed for an elicitation process based on the predictive prior distribution by using Laplace approximation for integrals. We suppose that an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gompertz distribution; Objective prior; Jeffreys prior; Subjective prior; Maximal data information prior; Elicitation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602643

Interspecific variation in leaf pigments and nutrients of five tree species from a subtropical forest in southern Brazil
Provedor de dados: 42
Autores: BÜNDCHEN,MÁRCIA; BOEGER,MARIA REGINA T.; REISSMANN,CARLOS B.; GERONAZZO,KELLY M.
ABSTRACT The purpose of this study was to analyze the seasonal variation in the nutrient and pigment content of leaves from five tree species - of which three are perennial (Cupania vernalis, Matayba elaeagnoides and Nectandra lanceolata) and two are deciduous (Cedrela fissilis and Jacaranda micrantha) - in an ecotone between a Deciduous Seasonal Forest and a Mixed Ombrophilous Forest in the state of Santa Catarina, Brazil. Leaf samples were collected in the four seasons of the year to determine the content of macronutrients (N, K, P, Mg, Ca, S) and photosynthetic pigments (Chla, Chlb, Chltot, Cartot, Chla:Chlb and Cartot:Chltot). The principal component analysis showed that leaf pigments contributed to the formation of the first axis, which explains most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Araucaria forest; Deciduous Forest; Macronutrients.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200467

Antileishmanial activity of some Brazilian plants, with particular reference to Casearia sylvestris
Provedor de dados: 42
Autores: Antinarelli,Luciana M.R.; Pinto,Nícolas C.; Scio,Elita; Coimbra,Elaine S.
Leishmaniasis is a complex of diseases caused by Leishmania protozoa which treatment is restricted to a limited number of drugs that exhibit high toxicity, collateral effects and are often costly. There are a variety of tropical plants distributed in Brazil, and for many poor people the therapy for several diseases is based mainly on the use of traditional herbal remedies. In this work, the cytotoxic activity of 17 plant methanol extracts was evaluated on several Leishmania species and murine macrophages. Among them, the extract of Casearia sylvestris, Piptocarpha macropoda, Trembleya parviflora, Samanea tubulosa and Plectranthus neochilus showed a promissing leishmanicidal activity, exhibiting IC50 values below of 20 µg/mL against at least one species of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Casearia sylvestris; Leishmanicidal activity; Medicinal plants; Natural products.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200733

Sunlight-driven water splitting using hematite nanorod photoelectrodes
Provedor de dados: 42
Autores: SOUZA,FLAVIO L.
ABSTRACT The efficiency of nanostructures for photoelectrochemical water-splitting is fundamentally governed by the capability of the surface to sustain the reaction without electron trapping or recombination by photogenerated holes. This brief review will summarize the latest progress on hematite, designed with columnar morphology via chemical synthesis, for photoelectrochemical cell application. The columnar morphology efficiently minimizes the number of defects, grain boundaries, and surface traps normally present on the planar morphology. The major drawback related to hole diffusion through the solid/liquid interface was addressed by using high annealing temperature combined with dopant addition. A critical view and depth of understanding of these two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sunlight irradiation; Water oxidation reaction; Photoanode; Hematite; Columnar morphology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200745

Hematological and biochemical profile of BALB/c nude and C57BL/6 SCID female mice after ovarian xenograft
Provedor de dados: 42
Autores: FERNANDES,DENILSA P.; PIMENTEL,MURIEL M.L.; SANTOS,FERNANDA A. DOS; PRAXEDES,ÉRIKA A.; BRITO,PARMÊNEDES D. DE; LIMA,MIKAEL A.; LELIS,IVANA C.N.G.; MACEDO,MICHELLY F. DE; BEZERRA,MARCELO B.
Abstract Hematological and biochemical profile studies help to evaluate functional changes of animals used in experiments. The aim of this study was to determine the hematological and biochemical profile of immunosuppressed BALB/c nude and C57BL/6 SCID mice after bovine ovarian xenotransplantation. Therefore, a total of 74 female mice were divided into four groups: non-xenotransplanted animals, xenotransplanted animals, xenotransplanted animals treated with eCG and xenotransplanted animals treated with FSH + LH. After anesthesia, blood samples were collected and hematologic and biochemical values were evaluated. The results showed no significant differences (p ≤ 0.05) for hematological parameters between the control group and the treatment groups of both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemistry; Hematology; Immunosuppressed; Mus musculus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703941

D-glyceric aciduria
Provedor de dados: 42
Autores: DIMER,NÁDIA W.; SCHUCK,PATRÍCIA F.; STRECK,EMILIO L.; FERREIRA,GUSTAVO C.
Inherited metabolic diseases are a heterogeneous group of diseases caused by a punctual defect in cell metabolism, resulting in the accumulation of toxic intermediate metabolites or in the lack of important biomolecules for adequate cell functioning. D-glyceric aciduria is an inherited disease caused by a deficiency of glycerate 2-kinase activity, whose pathophysiological mechanisms remain unknown. The main clinical and neurological symptoms seen in affected patients include progressive encephalopathy, hypotonia, psychomotor and mental retardation, microcephaly, seizures, speech delay, metabolic acidosis, and even death. In this review we shall discuss these clinical and biochemical findings, as well as diagnosis and treatment of affected patients in order...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: D-glycerate; D-glyceric aciduria; Glycerate kinase; Glyceric acid; Organic acidurias.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301409

Erratum
Provedor de dados: 42
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603241

Histatin 5 and human lactoferrin inhibit biofilm formation of a fluconazole resistant Candida albicans clinical isolate
Provedor de dados: 42
Autores: CURVELO,JOSÉ A.R.; MORAES,DANIEL C. DE; ANJOS,CAMILA A. DOS; PORTELA,MARISTELA B.; SOARES,ROSANGELA M.A.
Abstract:Candida albicans is the most important fungal pathogen that causes infections in humans. Biofilms are hard-to-treat structures due to their high antifungal resistance. Saliva is a fluid that contains antimicrobial substances acting as the first-line of defense against pathogens, and its immune components may be potential tools for the discovery of new treatments against candidiasis. To evaluate the activity of histatin 5 and human lactoferrin against biofilm formation. A fluconazole-resistant Candida albicans clinical isolate was used as the model microorganism. Morphogenesis was evaluated by differential counting. Biofilm quantification was performed by XTT reduction assay. Thickness and topography of biofilms were assessed through confocal laser...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofilm; Candida albicans; Fluconazole resistance; Histatin 5; Lactoferrin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100622

Protists and bacteria interactions in the presence of oil
Provedor de dados: 42
Autores: BITENCOURT,JOSÉ A.P.; SILVA,FREDERICO SOBRINHO; SILVA-NETO,INÁCIO D. DA; CRAPEZ,MIRIAN A.C.
Little is known about the role of protists and bacteria interactions during hydrocarbon biodegradation. This work focused on the effect of oil on protists from three different locations in Guanabara Bay and bacteria from Caulerpa racemosa (BCr), Dictyota menstrualis (BDm) and Laurencia obtusa (BLo) during a 96 h bioassay. Cryptomonadida (site 1, 2 and 3), Scuticociliatida (site 2) and Euplotes sp.1 and Euplotes sp.2 (site 3) appeared after incubation. The highest biomass observed in the controls was as follows: protist site 3 (6.0 µgC.cm–3, 96 h) compared to site 3 with oil (0.7 µgC.cm–3, 96 h); for bacteria, 8.6 µgC.cm–3(BDm, 72 h) and 17.0 µgC.cm–3(BCr with oil, 24 h). After treatment, the highest biomasses were as follows: protists at site 1 and BLo,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial consortia; Biomass; Free living protist; Guanabara Bay; Microbial loop; Petroleum.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200745

Description of three more new species of the genus Ananteris
Provedor de dados: 42
Autores: LOURENCO,WILSON R.; GIUPPONI,ALESSANDRO P.L.; LEGUIN,ELISE-ANNE.
Three new species of the genus Ananteris Thorell have been discovered in Brazil. Ananteris desiderio sp. n., Ananteris camacan sp. n. and Ananteris infuscata sp. n. are respectively described from specimens collected in the regions of São Desidério, Camacã, Rebio UNA and Jequié in the state of Bahia, and Grão Mogol and Novo Horizonte in the state of Minas Gerais, Brazil. New records are also proposed for Ananteris luciae Lourenço, Ananteris mauryi Lourenço and Ananteris franckei Lourenço. The number of known Ananteris species known in the scorpion fauna of Brazil is now raised to 24.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Neotropical fauna; Taxonomy; Scorpions; Bahia; Minas Gerais.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200709

Glandular trichome density and essential oil composition in leaves and inflorescences of Lippia origanoides Kunth (Verbenaceae) in the Brazilian Cerrado
Provedor de dados: 42
Autores: Tozin,Luiz R.S.; Marques,Marcia O.M.; Rodrigues,Tatiane M.
The essential oils from leaves and inflorescences of Lippia origanoides Kunth present aromatic and medicinal potential and have been used to treat several diseases, including melanoma. In Brazil, L. origanoides is commonly found in campo cerrado and cerrado stricto sensu, physiognomies featured mainly by the differential light conditions to which short and medium-sized plants are subjected. Our aim was to investigate the glandular trichome density and the yield and chemical composition of the essential oils in leaves and inflorescences of L. origanoides from campo cerrado and cerrado stricto sensu. For glandular density analysis, leaves and inflorescences were processed according to conventional techniques for scanning electron microscopy. The essential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo cerrado; Cerrado stricto sensu; External glands; Terpenes.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200943

Pollen types and levels of total phenolic compounds in propolis produced by Apis mellifera L. (Apidae) in an area of the Semiarid Region of Bahia, Brazil
Provedor de dados: 42
Autores: MATOS,VANESSA R.; ALENCAR,SEVERINO M.; SANTOS,FRANCISCO A.R.
Twenty-two propolis samples produced by Apis mellifera L. in an area of the Semiarid region the the State of Bahia (Agreste of Alagoinhas), Brazil, were palynologically analyzed and quantified regarding their levels of total phenolic compounds. These samples were processed using the acetolysis technique with the changes suggested for use with propolis. We found 59 pollen types belonging to 19 families and 36 genera. The family Fabaceae was the most representative in this study with nine pollen types, followed by the family Asteraceae with seven types. The typesMikania and Mimosa pudica occurred in all samples analyzed. The types Mimosa pudica andEucalyptus had frequency of occurrence above 50% in at least one sample. The highest similarity index (c. 72%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apicultural products; Floristic similarity; Melissopalynology; Phenolic compounds.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100407

Mini-incubators improve the adventitious rooting performance of Corymbia and Eucalyptus microcuttings according to the environment in which they are conditioned
Provedor de dados: 42
Autores: BRONDANI,GILVANO E.; OLIVEIRA,LEANDRO S. DE; KONZEN,ENÉAS R.; SILVA,ANDRÉ L.L. DA; COSTA,JEFFERSON L.
ABSTRACT We addressed a major challenge in the in vitro clonal propagation of Corymbia citriodora, Eucalyptus urophylla and E. benthamii by using an ex vitro adventitious rooting strategy in a mini-incubator. Mini-incubators were placed in four environments for rooting. A shade house with no fogging system and a greenhouse with no ventilation but with a fogging environment had the best performance in terms of rooting, root growth and survival of microcuttings. Daily recording of the temperature within each mini-incubator in each environment allowed the verification of negative correlations between the maximum average temperature and the survival, adventitious rooting and root growth. The ideal maximum air temperature for the efficient production of clonal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maximum average temperature; Micropropagation; Rhizogenesis; Shade house; Greenhouse.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502409

Active polyketides isolated from Penicillium herquei
Provedor de dados: 42
Autores: MARINHO,ANDREY M.R.; MARINHO,PATRÍCIA S.B.; SANTOS,LOURIVALDO S.; RODRIGUES FILHO,EDSON; FERREIRA,IZABEL C.P.
In this work we are reporting the isolation by classical methods of chromatography of six polyketides from Penicillium herquei. The compounds citreorosein ( 1) , emodin ( 2) , janthinone ( 3) , citrinin ( 4) , citrinin H1 ( 5) and dicitrinol ( 6) were identified by spectral methods of 1D and 2D NMR and MS. Compounds 1, 2 and 3 were tested against promastigotes forms of Leishmania brasiliensis and 1 and 2 were also assayed against Escherichia coli, Pseudomonas aeruginosa and Bacillus subtilis and showed good activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyketides; Biological assay; P. herquei.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300909

Inhibition of caspase-8 activity reduces IFN-gamma expression by T cells from Leishmania major infection
Provedor de dados: 42
Autores: Pereira,Wânia F.; Guillermo,Landi V.C.; Ribeiro-Gomes,Flávia L.; Lopes,Marcela F.
Following infection with Leishmania major, T cell activation and apoptosis can be detected in draining lymph nodes of C57BL/6-infected mice. We investigated the mechanisms involved in apoptosis and cytokine expression following Tcellactivation. After two weeks of infection, apoptotic T cells were not detected in draining lymph nodes but activation with anti-CD3 induced apoptosis in both CD4 and CD8 T cells. Treatment with anti-FasLigand, caspase-8 or caspase- 9 inhibitors did not block activation-induced T-cell death. We also investigated whether the blockade of caspase-8 activity would affect the expression of type-1 or type-2 cytokines. At early stages of infection, both CD4 and CD8 T cells expressed IFN-gamma upon activation. Treatment with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apoptosis; Caspase-8; CD8 T cells; IFN-gamma; Leishmaniasis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100008

Geochemistry of intertidal sediment pore waters from the industrialized Santos-Cubatão Estuarine System, SE Brazil
Provedor de dados: 42
Autores: Gonçalves,Winston F.O.; Luiz-Silva,Wanilson; Machado,Wilson; Nizoli,Erico C.; Santelli,Ricardo E.
The geochemical composition of sediment pore water was investigated in comparison with the composition of sediment particles and surface water in an estuary within one of the most industrialized areas in Latin America (Santos-Cubatão estuarine system, SE Brazil). Pore and surface waters presented anomalously high levels of F-, NH4+, Fe, Mn and P due to two industrial point sources. In the summer, when SO4(2-)/Cl- ratios suggested an enhanced sulfate reduction, the higher dissolved levels observed in pore waters for some metals (e.g., Cu and Ni) were attributed to reductive dissolution of oxidized phases. Results evidenced that the risks of surface water concentration increase due to diffusion or advection from pore water are probably dependent on coupled...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochemical anomaly; Industrial contamination; Pore water geochemistry.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200013

Bibliometric Analysis for Pattern Exploration in Worldwide Digital Soil Mapping Publications
Provedor de dados: 42
Autores: CANCIAN,LUCIANO C.; DALMOLIN,RICARDO S.D.; CATEN,ALEXANDRE T.
Abstract Bibliometric analyses provide a clear understanding of the scientific performance and relate them with standards of the global scientific production. Soil science is an outstanding and developing field among environmental sciences. Knowledge about soil characteristics and their distribution in the environment has been enriched by the use of new geotechnologies, resulting in what is known as digital soil mapping. Thus, the objective of this work was to characterize the scientific production in digital soil mapping in Brazil and in the world, in the period from 1996 to 2017, in databases such as Scopus and Web of Science. In the general context of increasing numbers of papers, the journal Geoderma published the highest number of related papers....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedometrics; Soil science; Soil meta-analysis; Soil survey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703911

New turtle egg fossil from the Upper Cretaceous of the Laiyang Basin, Shandong Province, China
Provedor de dados: 42
Autores: WANG,QIANG; WANG,XIAOLIN; ZHAO,ZIKUI; ZHANG,JIALIANG; JIANG,SHUNXING.
A new type of turtle egg fossil was established: Emydoolithus laiyangensis oogen. et oosp. nov.. Based on its elliptical morphological shape, rigid eggshells, and eggshell characteristics, it is different from other types of round chelonian egg fossils. It is the second chelonian egg fossil found in Cretaceous in China. This discovery shows the Laiyang ecosystem in Late Cretaceous is more diversified than previously thought.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Turtle egg fossil; Jingangkou Formation; Late Cretaceous; Laiyang Basin; Shandong Province.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100103

Expanded perlite/cork fillers applied to aerospace insulation materials
Provedor de dados: 42
Autores: PINTO,JULIANO R.A.; SANCHES,NATALIA B.; DINIZ,MILTON F.; SANTOS,RÉGIS S.; OLIVEIRA,JOSÉ I.S. DE; DUTRA,RITA DE CÁSSIA L.
Abstract Insulations for rocket motors such as Flexible Thermal Protections (FTPs) and Rigid Thermal Protection (RTPs) act as thermal barriers against the hyperthermal environment from the solid propellant combustion. FTPs present dual function: to extend RTPs performance, and to attenuate the propellant contraction. FTPs used in the Brazilian Space Program have asbestos in their composition since the 70´s; however, they are hazardous for human health. In this context, a mixture of Expanded Perlite (PExp) and Cork Powder (CP) was investigated as a replacement for asbestos. Results showed reduction about 21 % in density and an increase of 13 % in the ablative properties. The low mechanical properties not interfere in this type of FTP due to your function of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asbestos replacement; Cork; HTPB; Insulation; Perlite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603197

Growth and reproduction of the mangrove crab Goniopsis cruentata (Latreille, 1803) (Crustacea: Decapoda: Grapsidae) in southeastern Brazil
Provedor de dados: 42
Autores: Reis,Carla R.G.; Taddei,Fabiano G.; Cobo,Valter J.
Goniopsis cruentata is a common semi-terrestrial crab in Brazilian mangroves and an important fishery resource for traditional communities in the northeastern Brazilian coast. Aiming to contribute to the knowledge about the species, this study evaluated the carapace width and weight growth curves, the relative growth of weight versus carapace width, and the temporal variation of gonadosomatic and hepatosomatic indices for the species. A total of 524 crabs were collected in a mangrove area of Ubatuba municipality, state of São Paulo. The growth-curves parameters and longevity (tmax) were estimated for males (CW∞=50.6 mm, WE=56.4 g, k=2.24, t0=0.003631502 year-1, tmax=1.3 years) and females (CW∞=50.7 mm, WE∞=58.8 g, k=2.50, t0=0.003247209 year-1, tmax=1.2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonad development; Growth curves; Hepatopancreas; Relative growth.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200699

Iron transportation across the placenta
Provedor de dados: 42
Autores: Oliveira,Claudia M. de; Rodrigues,Marcio N.; Miglino,Maria Angélica.
According to the classification of placental types among animals, the transfer of iron through the placenta can occur via: absorption connected to transferin through the outer surface of the trophoblast in direct contact with circulating maternal blood; absorption of the erythrocytes by the chorionic epithelium in direct contact with accumulation of blood extravased from haemotophagous areas; absorption by the chorionic epithelium in direct contact with iron enriched secretions from the endometrial glands and absorption by extravasations of the blood in the maternal-fetal surface and the subsequent phagocytosis of the erythrocytes by trophoblast cells described in bovine, small ruminants, canine and feline. The function of erythrophagocytosis observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endocitosis; Iron; Phagocytosis; Placental hematoma.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400025

Plant Extracts Display Synergism with Different Classes of Antibiotics
Provedor de dados: 42
Autores: SILVA,DANIELLE M.; COSTA,PRISCILLA A. DA; RIBON,ANDRÉA O.B.; PURGATO,GISLAINE A.; GASPAR,DIAZ-MUÑOZ; DIAZ,MARISA A.N.
Abstract: One manner in which plant-derived compounds exert their antibiotic potential is the synergism, a positive interaction between two compounds. Studies indicate that the use of plant extracts combined with antimicrobials may promote a significant reduction of the minimum inhibitory concentrations of antibiotics for bacterial strains. This study aimed to evaluate the activity of plant extracts and antibiotics as well as their combination on Staphylococcus aureus. The activity of 15 plant extracts was evaluated using diffusion assay. The minimum inhibitory concentrations (MICs) and the interactions between the extracts and antibiotics as well as compound emodin were evaluated with the checkerboard method. The active extracts were a hexane extract of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibiotics; Bovine mastitis; Plant extract; Staphylococcus aureus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300802

Probable first occurrence of Lycopodiales in the Gondwana Neopaleozoic
Provedor de dados: 42
Autores: RICARDI-BRANCO,FRESIA; BERNARDES-DE-OLIVEIRA,MARY E.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300029

High spatial resolution analysis of Pb and U isotopes for geochronology by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS)
Provedor de dados: 42
Autores: Bühn,Bernhard; Pimentel,Márcio M.; Matteini,Massimo; Dantas,Elton L.
Age determinations using the 235U and 238U radioactive decay series to the daughter isotopes 207Pb and 206Pb, respectively, using the mineral zircon (ZrSiO4), are widely used to decipher geological processes. A new method developed in the last couple of years, the laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS), overcomes previous laborious sample preparation, and yields isotopic ratios and age data with a high spatial resolution of ten of microns. The present study describes the analytical set-up and data reduction process as presently applied at the Laboratory for Geochronology of the University of Brasília. It explores the precision and accuracy of the method by cross-analysing three international zircon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochronology; U-Pb isotopes; LA-MC-ICP-MS; Zircon; Age dating.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100011

Adapted Gaussian basis sets for atoms from Li through Xe generated with the generator coordinate Hartree-Fock method
Provedor de dados: 42
Autores: CASTRO,EUSTÁQUIO V. R. DE; JORGE,FRANCISCO E.
The generator coordinate Hartree-Fock method is used to generate adapted Gaussian basis sets for the atoms from Li (Z=3) through Xe (Z=54). In this method the Griffin-Hill-Wheeler-Hartree-Fock equations are integrated through the integral discretization technique. The wave functions generated in this work are compared with the widely used Roothaan-Hartree-Fock wave functions of Clementi and Roetti (1974), and with other basis sets reported in the literature. For all atoms studied, the errors in our total energy values relatively to the numerical Hartree-Fock limits are always less than 7.426 mhartree.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Generator coordinate Hartree-Fock method; Gaussian basis sets; Atomic total energy values.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400004

Artificial diet for laboratory rearing of Condylorrhiza vestigialis (Guenée, 1854) (Lep.: Crambidae)
Provedor de dados: 42
Autores: CAMPOS,LUCAS S.; COELHO JR,ALOISIO; PARRA,JOSÉ ROBERTO P.
ABSTRACT The Brazilian Poplar Moth, Condylorrhiza vestigialis (Guenée), compromises the wood productivity of poplar trees (Populus sp.), mainly affecting the matchstick industry in southern Brazil. Considering the lack of information on rearing techniques for this insect, the objective of this study was to develop an artificial diet to rear C. vestigialis with biological characteristics similar to the wild insects. A properly diet will enable bio-ecological studies and biological control programs using the baculovirus Condylorrhiza vestigialis multiple nucleopolyhedrovirus (CvMNPV). To attain this objective, first, three artificial diets were tested. Only the diet based on corn, wheat germ and yeast as a protein source (Diet 3) was able to supply the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: IPM; Biological control; Forest entomology; Baculovirus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100333

Plant-hummingbird interactions and temporal nectar availability in arestinga from Brazil
Provedor de dados: 42
Autores: FONSECA,LORENA C.N.; VIZENTIN-BUGONI,JEFERSON; RECH,ANDRÉ R.; ALVES,MARIA ALICE S.
ABSTRACT Hummingbirds are the most important and specialized group of pollinating birds in the Neotropics and their interactions with plants are key components to many communities. In the present study we identified the assemblage of plants visited by hummingbirds and investigated the temporal availability of floral resources in an area of restinga, sandy plain coastal vegetation associated with the Atlantic forest, in Southeastern Brazil. We recorded flower and nectar features, flowering phenology and interactions between plants and hummingbirds and estimated the amount of calories produced per hectare from June 2005 to August 2006. Ten plant species were visited by two hummingbirds,Amazilia fimbriata and Eupetomena macroura. Resource availability was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazilia fimbriata; Atlantic rainforest; Floral resources; Ornitophily; Pollination; Restinga.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502163

Beyond diversity loss and climate change: Impacts of Amazon deforestation on infectious diseases and public health
Provedor de dados: 42
Autores: ELLWANGER,JOEL HENRIQUE; KULMANN-LEAL,BRUNA; KAMINSKI,VALÉRIA L.; VALVERDE-VILLEGAS,JACQUELINE MARÍA; VEIGA,ANA BEATRIZ G. DA; SPILKI,FERNANDO R.; FEARNSIDE,PHILIP M.; CAESAR,LÍLIAN; GIATTI,LEANDRO LUIZ; WALLAU,GABRIEL L.; ALMEIDA,SABRINA E.M.; BORBA,MAURO R.; HORA,VANUSA P. DA; CHIES,JOSÉ ARTUR B.
Abstract  Amazonian biodiversity is increasingly threatened due to the weakening of policies for combating deforestation, especially in Brazil. Loss of animal and plant species, many not yet known to science, is just one among many negative consequences of Amazon deforestation. Deforestation affects indigenous communities, riverside as well as urban populations, and even planetary health. Amazonia has a prominent role in regulating the Earth’s climate, with forest loss contributing to rising regional and global temperatures and intensification of extreme weather events. These climatic conditions are important drivers of emerging infectious diseases, and activities associated with deforestation contribute to the spread of disease vectors. This review...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon rainforest; Biodiversity; Emerging infectious disease; Deforestation; Pathogens; Public health.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100724

Diversity and distribution of epiphytic bromeliads in a Brazilian subtropical mangrove
Provedor de dados: 42
Autores: SOUSA,MARIANA M. DE; COLPO,KARINE D.
ABSTRACT It is not unusual to find epiphytic bromeliads in mangroves, but most studies on mangrove vegetation do not record their presence. This study aimed to evaluate the diversity and distribution of epiphytic bromeliads in a subtropical mangrove. The richness, abundance and life form (atmospheric and tank) of bromeliads were recorded and compared among host tree species and waterline proximity. The effects of diameter and height of host trees on the abundance of bromeliads were also assessed. The mangrove was composed of Avicennia schaueriana, Laguncularia racemosa and Rhizophora mangle. We recorded seven bromeliad species of the genera Tillandsia and Vriesea. The waterline proximity did not affect the abundance or diversity of bromeliads, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Bromeliad-host relationship; Species richness; Waterline distance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301085

On the use, by Einstein, of the principle of dimensional homogeneity, in three problems of the physics of solids
Provedor de dados: 42
Autores: CARNEIRO,FERNANDO L. LOBO B.
Einstein, in 1911, published an article on the application of the principle of dimensional homogeneity to three problems of the physics of solids: the characteristic frequency of the atomic nets of crystalline solids as a function of their moduli of compressibility or of their melting points, and the thermal conductivity of crystalline insulators. Recognizing that the physical dimensions of temperature are not the same as those of energy and heat, Einstein had recourse to the artifice of replace that physical parameter by its product by the Boltzmann constant, so obtaining correct results. But nowadays, with the new basic quantities "Thermodynamic Temperature theta (unit- Kelvin)'', "Electric Current I (unit Ampère)'' and "Amount of Substance MOL...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characteristic frequency of solids; Thermal conductivity; Dimensional homogeneity.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400009

Are we close to knowing the plant diversity of the Amazon?
Provedor de dados: 42
Autores: HOPKINS,MICHAEL J.G.
Abstract: Amazonia is often cited as having the most diverse flora on the planet. However, the total number of species of higher plants in the region has been largely a matter of guesswork. Some recent publications have estimated the total number of species present, which indicate a lower overall diversity than was estimated in the past. However, analysis of the sampling density across the region, and data from various sources suggest that there may be reason why the recent figures may be considerable underestimates. I believe that much more investment in extensive collecting of quality plant specimens is needed to encounter the very large number of rare and local species that might never have been collected. Unfortunately the tendencies of investment in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Amazonia; Species discovery; Plants.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600616

Pertuzumab and trastuzumab: the rationale way to synergy
Provedor de dados: 42
Autores: RICHARD,SANDRINE; SELLE,FRÉDÉRIC; LOTZ,JEAN-PIERRE; KHALIL,AHMED; GLIGOROV,JOSEPH; SOARES,DANIELE G.
ABSTRACT It has now been 15 years since the HER2-targeted monoclonal antibody trastuzumab was introduced in clinical and revolutionized the treatment of HER2-positive breast cancer patients. Despite this achievement, most patients with HER2-positive metastatic breast cancer still show progression of their disease, highlighting the need for new therapies. The continuous interest in novel targeted agents led to the development of pertuzumab, the first in a new class of agents, the HER dimerization inhibitors. Pertuzumab is a novel recombinant humanized antibody directed against extracellular domain II of HER2 protein that is required for the heterodimerization of HER2 with other HER receptors, leading to the activation of downstream signalling pathways....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breast cancer; Dimerization; HER2/3; Monoclonal antibody; Pertuzumab; Trastuzumab.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200565

Deacylative alkylation (DaA) of N-methyl-3-acetyl-2-oxindole for the synthesis of symmetrically 3,3-disubstituted 2-oxindoles. An access gate to anticancer agents and natural products.
Provedor de dados: 42
Autores: MORENO-CABRERIZO,CRISTINA; ORTEGA-MARTÍNEZ,AITOR; MOLINA,CYNTHIA; NÁJERA,CARMEN; SANSANO,JOSÉ M.
ABSTRACT The synthesis of 3,3-disubstituted N-methyloxindoles, starting from 3-acetyl-2-hydroxy-1-methyloxindole employing a sequential one-pot synthesis, is studied. The process involves a first alkylation in the presence of 1 equiv. of both organic halide and Triton B and the second one employs another 1.5 equiv. of each in moderate to high yields. This procedure is compared with the results obtained from the direct dialkylation of N-methyloxindole. The metathesis of one of the corresponding diallylated product was also studied obtaining the spiranic oxindole. All these methodologies are directed towards the access to anticancer agents and natural biologically active products.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deacylation; Alkylation; 2-oxindoles; Metathesis; Anticancer; Natural products.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301089

Palynological analysis of a sediment core obtained in Guanabara Bay, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Barreto,Cintia F.; Luz,Cynthia F.P. da; Baptista-Neto,José A.; Vilela,Claudia G.; Barth,Ortrud M.
The sediment of a core collected about 2 km north of Paquetá Island, Guanabara Bay, was submitted to pollen analysis, in order to recognize the dynamics of the regional vegetation, and the anthropic influence. Radiocarbon dating of a sample next to the bottom of the core indicates an age of 4.210 ± 40 14C yrs B.P (calibrated age). It was possible to establish four palynological zones. Starting at the bottom of the core, a decrease in palynomorph concentration, the presence of degraded pollen grains and spores, and the predominance of ombrophilous forest pollen grains were observed in the basal portion of Zone I. These data may indicate the presence of an exuberant Atlantic Forest, dominated by a marine regressive event. The concentration of well-preserved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen; Quaternary Palynology; Guanabara Bay; Paleoenvironment.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200005

Note on gynandromorphism in the eucalyptus defoliator Thyrinteina arnobia (Stoll, 1782) (Lepidoptera: Geometridae)
Provedor de dados: 42
Autores: Bernardino,Aline S.; Zanuncio,Teresinha V.; Zanuncio,José C.; Lima,Eraldo R.; Serrão,José E.
The brown moth Thyrinteina arnobia (Stoll, 1872) (Lepidoptera: Geometridae) is an important pest in Brazilian eucalyptus plantations. A gynandromorph individual of T. arnobia was found in a population of this pest in a laboratory rearing and it is described.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thyrinteina; Brown moth; Gynandromorphism; Eucalyptus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200006

Superficial distribution of aromatic compounds and geomicrobiology of sediments from Suruí Mangrove, Guanabara Bay, RJ, Brazil
Provedor de dados: 42
Autores: Fontana,Luiz F.; Silva,Frederico S. da; Figueiredo,Natália G. de; Brum,Daniel M.; Netto,Annibal D. Pereira; Gigueiredo Junior,Alberto G. de; Crapez,Mirian A.C.
The distribution of selected aromatic compounds and microbiology were assessed in superficial sediments from Suruí Mangrove, Guanabara Bay. Samples were collected at 23 stations, and particle size, organic matter, aromatic compounds, microbiology activity, biopolymers, and topography were determined. The concentration of aromatic compounds was distributed in patches over the entire mangrove, and their highest total concentration was determinated in the mangrove's central area. Particle size differed from most mangroves in that Suruí Mangrove has chernies on the edges and in front of the mangrove, and sand across the whole surface, which hampers the relationship between particle size and hydrocarbons. An average @ 10% p/p of organic matter was obtained, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbiologic activity; Guanabara Bay; Biopolymers; Phenol; Aromatic Polycyclic Hydrocarbons and Monoaromatics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400022

Structure, histochemistry and phytochemical profile of the bark of the sobol and aerial stem of Tontelea micrantha (Celastraceae - Hippocrateoideae)
Provedor de dados: 42
Autores: MERCADANTE-SIMÕES,MARIA OLÍVIA; MAZZOTTINI-DOS-SANTOS,HELLEN C.; NERY,LAYS A.; FERREIRA,PERACIO R.B.; RIBEIRO,LEONARDO M.; ROYO,VANESSA A.; OLIVEIRA,DARIO A. DE.
The bark of the underground stem of Tontelea micrantha (Mart. ex. Schult.) A. C. Sm., a native Brazilian Cerrado species, is used in folk medicine for treating kidney ailments. The structures of the underground and the aerial stems were examined and their barks were analyzed for the presence of secondary metabolites. Bark fragments were processed according to conventional techniques in plant anatomy and their chemical compositions examined using histochemical and phytochemical tests, thin layer chromatography, and high-efficiency liquid chromatography. The underground stem is a sobol with unusual cambial activity. Laticifers that secrete terpenoids were present in the cortex and phloem of both organs and can contribute to the identification of the species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural products; Pharmacognosy; Secondary metabolites; Sobol.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301167

Pelvic and hind limb musculature of Staurikosaurus pricei (Dinosauria: Saurischia)
Provedor de dados: 42
Autores: Grillo,Orlando N.; Azevedo,Sergio A.K.
The study of pelvic and hind limb bones and muscles in basal dinosaurs is important for understanding the early evolution of bipedal locomotion in the group. The use of data from both extant and extinct taxa placed into a phylogenetic context allowed to make well-supported inferences concerning most of the hind limb musculature of the basal saurischian Staurikosaurus pricei Colbert, 1970 (Santa Maria Formation, Late Triassic of Rio Grande do Sul, Brazil). Two large concavities in the lateral surface of the ilium represent the origin of the muscles iliotrochantericus caudalis plus iliofemoralis externus (in the anterior concavity) and iliofibularis (in the posterior concavity). Muscle ambiens has only one head and originates from the pubic tubercle. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extant phylogenetic bracket; Locomotion; Muscular reconstruction; Saurischia; Staurikosaurus pricei.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100005

The effects of coconut oil supplementation on the body composition and lipid profile of rats submitted to physical exercise
Provedor de dados: 42
Autores: RESENDE,NATHÁLIA M.; FÉLIX,HENRIQUE R.; SORÉ,MURILLO R.; M.M. NETO,ANÍBAL; CAMPOS,KLEBER E.; VOLPATO,GUSTAVO T.
This study aims to verify the effects of coconut oil supplementation (COS) in the body composition and lipid profile of rats submitted to physical exercise. The animals (n=6 per group) were randomly assigned to: G1=Sedentary and Non-supplemented (Control Group), G2=Sedentary and Supplemented, G3=Exercised and Non-supplemented and G4=Exercised and Supplemented. The COS protocol used was 3 mL/Kg of body mass by gavage for 28 days. The physical exercise was the vertical jumping training for 28 days. It was determined the body mass parameters, Lee Index, blood glucose and lipid profile. The COS did not interfere with body mass, but the lean body mass was lower in G3 compared to G2. The final Lee Index classified G1 and G2 as obese (&gt;30g/cm). The lipid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocos nucifera; LDL-c/HDL-c ratio; Lipid profile; Nutrition; Rats; Vertical jumping training.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300933

Sustainable farming with native rocks: the transition without revolution
Provedor de dados: 42
Autores: Fyfe,William S.; Leonardos,Othon H.; Theodoro,Suzi H.
The development process which humanity passed through favored a series of conquests, reflected in the better quality of life and longevity, however, it also provoked upsets and severe transformation in the environment and in the human food security. Such process is driving the ecosystems to be homogeneous, and, therefore, the nutrients' supply, via nourishment. To change this panorama, the present work discusses the gains of incorporating the stonemeal technique as a strategic alternative to give back the essential fertile characteristics to the soils. This technology has the function of facilitating the rejuvenation of the soils and increasing the availability of the necessary nutrients to the full development of the plants which is a basic input for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stonemeal; Remineralize; Soil remediation; Sustainable agriculture.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400007

The Glória quartz-monzodiorite: isotopic and chemical evidence of arc-related magmatism in the central part of the Paleoproterozoic Mineiro belt, Minas Gerais State, Brazil
Provedor de dados: 42
Autores: Ávila,Ciro A.; Teixeira,Wilson; Cordani,Umberto G.; Barrueto,Héctor R.; Pereira,Ronaldo M.; Martins,Veridiana T.S.; Dunyi,Liu.
The Glória quartz-monzodiorite, one of the mafic plutons of the Paleoproterozoic Mineiro belt, is intrusive into banded gneisses, amphibolites, schists and phyllites of the Rio das Mortes greenstone belt, in the southern portion of the São Francisco Craton, State of Minas Gerais, Brazil. The Glória quartz-monzodiorite yields a SHRIMP U-Pb zircon age of 2188 ± 29 Ma, suggesting a tectonic relationship with the pre-collisional phase of the Mineiro belt. According to the Nd isotopic evidence (epsilonNd(T) = -3.4; T DM = 2.68 Ga) the original magmas was formed by a mixture among Archean crustal material and Paleoproterozoic juvenile magma. The Glória quartz-monzodiorite shows metaluminous and calc-alkaline tendency with intermediate K content, comparable to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glória quartz-monzodiorite; U-Pb SHRIMP; Sm-Nd isotopes; Mineiro belt; São Francisco Craton.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300013

Neurotrophins, cytokines, oxidative parameters and funcionality in Progressive Muscular Dystrophies
Provedor de dados: 42
Autores: COMIM,CLARISSA M.; MATHIA,GISIANE B.; HOEPERS,ANDREZA; TUON,LISIANE; KAPCZINSKI,FLÁVIO; DAL-PIZZOL,FELIPE; QUEVEDO,JOÃO; ROSA,MARIA I.
We investigated the levels of brain derived-neurotrophic factor (BDNF), cytokines and oxidative parameters in serum and tried to correlate them with the age and functionality of patients with Progressive Muscle Dystrophies (PMD). The patients were separated into six groups (case and controls pared by age and gender), as follows: Duchenne Muscular Dystrophy (DMD); Steinert Myotonic Dystrophy (SMD); and Limb-girdle Muscular Dystrophy type-2A (LGMD2A). DMD patients (±17.9 years old) had a decrease of functionality, an increase in the IL-1β and TNF-α levels and a decrease of IL-10 levels and superoxide dismutase activity in serum. SMD patients (±25.8 years old) had a decrease of BDNF and IL-10 levels and superoxide dismutase activity and an increase of IL-1β...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Progressive Muscular Dystrophies; BNDF; Cytokines; Oxidative stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401809

Molecular biology of mycoplasmas: from the minimum cell concept to the artificial cell
Provedor de dados: 42
Autores: CORDOVA,CAIO M.M.; HOELTGEBAUM,DANIELA L.; MACHADO,LAÍS D.P.N.; SANTOS,LARISSA DOS.
ABSTRACT Mycoplasmas are a large group of bacteria, sorted into different genera in the Mollicutes class, whose main characteristic in common, besides the small genome, is the absence of cell wall. They are considered cellular and molecular biology study models. We present an updated review of the molecular biology of these model microorganisms and the development of replicative vectors for the transformation of mycoplasmas. Synthetic biology studies inspired by these pioneering works became possible and won the attention of the mainstream media. For the first time, an artificial genome was synthesized (a minimal genome produced from consensus sequences obtained from mycoplasmas). For the first time, a functional artificial cell has been constructed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycoplasma; Molecular biology; Microbial genetics; Synthetic biology; Gene transfer techniques.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200599

Proteins and Peptides at the Interfaces of Nanostructures
Provedor de dados: 42
Autores: BRITO,ADRIANNE M.M.; BELLETI,ELISANGELA; MENEZES,LUCIVALDO R.; LANFREDI,ALEXANDRE J.C.; NANTES-CARDOS,ISELI L.
Abstract:  The present review focuses on the proteins and peptides at the interfaces of nanostructured metals and semiconductors as a result of their use in synthesis in-situ and functionalization of nanostructures. We start the review with an introduction about the peculiar properties of nanostructured materials and their applications. In the following, the chemical and structural properties of peptides and proteins that allow their use as reducing, stabilizing, and functionalization agents are discussed. P﻿roteins and peptides have not only the chemical groups for the metal ion reducing but also provide templates for directing the crystalline growing of nanostructures to the desired shapes and sizes. Proteins and peptides are also used mainly for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controlled synthesis; Noble-metals; Nanomaterials; Catalysis; Proteins; Peptides.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700402

Evaluation of the impact of pharmaceutical care for tuberculosis patients in a Secondary Referral Outpatient Clinic, Minas Gerais, Brazil
Provedor de dados: 42
Autores: LOPES,ANDREZA R.V.; MIRANDA,SILVANA S. DE; CECCATO,MARIA DAS GRAÇAS B.; SILVEIRA,MICHELINE R.; RESENDE,NATÁLIA H. DE; CARVALHO,WÂNIA S.
ABSTRACT Pharmaceutical care is a professional practice seeking the responsible provision of drug therapy by identifying, resolving, and preventing Drug-Related Problems (DRP). The study aims to describe and evaluate the impact of pharmaceutical care given to patients being treated for tuberculosis (TB). Study concurrent, longitudinal, prospective conducted during pharmaceutical care in the TB outpatient clinic, Clinical Hospital, Federal University of Minas Gerais during the period August 2009 to July 2012. The Pharmacotherapy Workup proposed by Cipolle et al. (2004) was used. Statistical analyses were performed by X2 or Fisher exact test, as appropriate. A total of 62 patients were followed up, and 128 drug-related problems (DRP) were identified: 69.5%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pharmaceutical care; Drug-related problems; Tuberculosis; Pharmacotherapeutic follow-up.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602911

Phenotypic and genotypic characterization of Salmonella spp. isolated from foods and clinical samples in Brazil
Provedor de dados: 42
Autores: MIRANDA,ANDREA L.; CORDEIRO,SORAIA M.; REIS,JOICE N.; CARDOSO,LUCAS G.; GUIMARÃES,ALAÍSE G.
ABSTRACT Increasing antimicrobial resistance in Salmonella species has been a serious problem for public health worldwide. This study examines Salmonella spp. recovered from foods and clinical samples on serotype, antimicrobial resistance and PFGE genotypes. It identified 91 salmonellae, belonging to 31 different serotypes, from 36 isolates from food and 55 clinical samples. Salmonella Infantis (16.5%) and Salmonella Enteritidis (13.7%) are the most common among food isolates, whereas Salmonella Enteritidis (29.0%) and Salmonella Typhimurium (16.0%) mainly causes human salmonellosis. Antimicrobial susceptibility data showed that 63.0% of the isolates were fully susceptible to 12 antibiotics tested. Nalidixic acid showed high resistance rates, 32.7% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Salmonella Infantis; Salmonella Enteritidis; Antimicrobial resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301143

Petrology of dioritic, tonalitic and trondhjemitic gneisses from Encantadas Complex, Santana da Boa Vista, southernmost Brazil: paleoproterozoic continental-arc magmatism
Provedor de dados: 42
Autores: Philipp,Ruy P.; Lusa,Marcelo; Nardi,Lauro V.S.
The Encantadas Complex is a unit composed of dioritic, tonalitic and trondhjemitic gneisses with minor hornblendite. This complex is intruded by granites of Neoproterozoic age. Major and trace element data indicate metaluminous to slightly peraluminous composition related to the medium-K calc-alkaline series. Compositional parameters are consistent with a common evolution from less differentiated magmas, probably through fractional crystallization. The orthogneisses show LaN/YbN ratios from 10 to 50, K2O/Na2O varying from 1.1 to 3.0, Y contents from 3 to 39 ppm, Yb from 0.3 to 3.7, and Lu with contents in the range 0.06 and 0.54 ppm. Such geochemical features are similar to those of Archaean tonalitic rocks and are usually described in rocks formed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continental arch; Crustal evolution; Encantadas gneisses; Paleoproterozoic; Petrology; TTG.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400013

Finitely curved orbits of complex polynomial vector fields
Provedor de dados: 42
Autores: Mafra,Albetã C.
This note is about the geometry of holomorphic foliations. Let X be a polynomial vector field with isolated singularities on C². We announce some results regarding two problems: 1. Given a finitely curved orbit L of X, under which conditions is L algebraic? 2. If X has some non-algebraic finitely curved orbit L what is the classification of X? Problem 1 is related to the following question: Let C &lt;FONT FACE=Symbol&gt;Ì&lt;/FONT&gt; C² be a holomorphic curve which has finite total Gaussian curvature. IsC contained in an algebraic curve?
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic foliations; Polynomial vector fields; Algebraic curves; Finite total curvature.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100002

Method validation for determination of metals in Vitis labrusca L. grapevine leaf extracts by inductively coupled plasma mass spectrometry (ICP-MS)
Provedor de dados: 42
Autores: BOKOWSKI,LIANE V.V.; SOBRINHO,ROBERTO B.; ARMIJO,CRISTIÁN J.V.; DANI,CAROLINE; HENRIQUES,JOÃO A.P.; FUNCHAL,CLÁUDIA.
ABSTRACT Vitis labrusca L. is the main species used for wine and juice production in Brazil. The grapevine leaves can be used both as functional foods and as cheapest sources for the extraction of phenolic compounds. Besides the antioxidant activity, grapevine leaves exhibited significant anti-inflammatory activity. Therefore, the aim of this study was to develop and validate an analytical methodology to determine the metals selenium (96Se), chromium (53Cr), nickel (62Ni), cadmium (111Cd) and lead (206Pb) in 30 samples of grapevine leaf extracts (Vitis labrusca, Bordo cultivar) using inductively coupled plasma mass spectrometry (ICP-MS). To obtain the grapevine leaf extracts the samples were milled, weighed and digested in microwave oven with nitric acid....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ICP-MS; Metals; Method validation; Vitis labrusca L.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602247

Where is sugarcane cropping expanding in the brazilian cerrado, and why? A case study
Provedor de dados: 42
Autores: ARRUDA,MURILO R. DE; GILLER,KEN E.; SLINGERLAND,MAJA.
ABSTRACT Sugarcane growing area in Brazil sharply expanded between 2000 and 2010 due to the increasing world demand for sugar and ethanol. Since this expansion of sugarcane is said to occur in areas covered by degraded pastures, it is likely not threatening the environment or food production. In order to verify this assumption, we investigate at farm and field levels which types of land use sugarcane cropping replaced between 2005 and 2010 and the reasons for farmers shifting or not shifting to sugarcane, as a case study in two counties in the state of Goiás. Within the studied period, sugarcane cropping expansion was related to large farms, lower risk perceived by farmers, and higher profitability compared with soybean and beef cattle-raising. For...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land use change; Dairy farming; Pastures; Cropping; Small farmers.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502485

Lymphocyte subset reference intervals in blood donors from northeastern Brazil
Provedor de dados: 42
Autores: TORRES,ALEX J.L.; CISNEIROS,PATRÍCIA; GUEDES,ROSA; GRASSI,MARIA FERNANDA R.; MEYER,ROBERTO; BENDICHO,MARIA T.; LOPES,TAIS G.S.L.; FÉLIX,GABRIELA; NETTO,EDUARDO M.; BRITES,CARLOS; ABE-SANDES,KIYOKO; BRANDÃO,CLAUDIO; ALCANTARA-NEVES,NEUZA; FREIRE,SONGELI M.
The reference intervals for leukocytes and lymphocytes currently used by most clinical laboratories present limitations as they are primarily derived from individuals of North American and European origin. The objective this study was to determine reference values for peripheral blood B lymphocytes, T lymphocyte subsets (CD4+, CD8+, naïve, memory, regulatory, TCRαβ and TCRγδ+) and NK cells from blood donors in Salvador-Bahia, Brazil. Results: The proportion of included male subjects was 73.7% and the median ages of males (34) and females (35) were found to be similar. Absolute counts total lymphocytes subsets to both gender was 1,956 (1,060-4,186) cells and relative values 34%. The T CD4+ and T CD8+ lymphocytes relative values was 51% (20-62) and 24%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lymphocyte subsets; Reference values; Flow cytometry; Brazil; Blood donors.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201019

Genetic modification of mammalian genome at chromosome level
Provedor de dados: 42
Autores: SEROV,OLEG L.; MATVEEVA,NATALIA M.; SEROVA,IRINA A.; BORODIN,PAVEL M.
The review is concerned with a progress in genetic modification of a mammalian genome in vitro and in vivo at chromosomal level. Recently three new approaches for the chromosome biotechnology have been developed: Using Cre/loxP-system a researcher is able to produce targeted rearrangements of whole chromosomes or their segments or particular genes within the genome, and therefore to modify the set, position and copy number of the endogenous elements of the genome. Mammalian artificial chromosomes (MACs) provide a possibility to introduce into genome relatively large segments of alien chromosome material, either artificially constructed or derived from the genome of different species. Using ES-somatic cell hybrids allows to transfer whole chromosomes or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome biotechnology; Cre/loxP; ES cells; MAC.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300012

Carbon dioxide/methanol conversion cycle based on cascade enzymatic reactions supported on superparamagnetic nanoparticles
Provedor de dados: 42
Autores: MARQUES NETTO,CATERINA G.C.; ANDRADE,LEANDRO H.; TOMA,HENRIQUE E.
ABSTRACT The conversion of carbon dioxide into important industrial feedstock is a subject of growing interest in modern society. A possible way to achieve this goal is by carrying out the CO2/methanol cascade reaction, allowing the recycle of CO2 using either chemical catalysts or enzymes. Efficient and selective reactions can be performed by enzymes; however, due to their low stability, immobilization protocols are required to improve their performance. The cascade reaction to reduce carbon dioxide into methanol has been explored by the authors, using, sequentially, alcohol dehydrogenase (ADH), formaldehyde dehydrogenase (FalDH), and formate dehydrogenase (FDH), powered by NAD+/NADH and glutamate dehydrogenase (GDH) as the co-enzyme regenerating system....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon dioxide; Enzyme cascade-reaction; Methanol production; Superparamagnetic nanoparticles; Enzymatic catalysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200593

Phytochemical profile and antimicrobial properties of Lotus spp. (Fabaceae)
Provedor de dados: 42
Autores: GIRARDI,FELIPE A.; TONIAL,FABIANA; CHINI,SILVIA O.; SOBOTTKA,ANDRÉA M.; SCHEFFER-BASSO,SIMONE M.; BERTOL,CHARISE D.
The phytochemical profile and antimicrobial activity of cultivar (cv.) extracts of Lotus uliginosus (cvs. Trojan and Serrano), L. tenuis (cv. Larrañaga) and L. corniculatus (cv. São Gabriel) were investigated. The phytochemical analysis revealed tannins, coumarins and flavonoids in all extracts, with variations among cultivars, showing genotypic variability. By High Performance Liquid Chromatographic method, the cvs. Larrañaga and São Gabriel showed the highest percentage of catechin and epicatechin, respectively, and presented rutin, which was not detected in the other ones. These genotypes showed antifungal activity but not antibacterial one. The cv. Larrañaga inhibited the mycelia growth of Alternaria sp. and Fusarium graminearum while the cv. São...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternaria; Flavonoids; Fusarium; Tannins.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301295

The use of piezocone tests for high-resolution stratigraphy of Quaternary sediment sequences in the Brazilian coast
Provedor de dados: 42
Autores: Mio,Giuliano de; Giacheti,Heraldo L.
Correlations between mapping units of costal sedimentary basin and interpretation of piezocone test results are presented and discussed based on examples from Caravelas strandplain, (State of Bahia), Paranaguá (State of Paraná) and Guarujá bays (State of São Paulo), Brazil. Recognizing that the sedimentary environment was mainly controlled by sea level fluctuations led to the interpretation of transgressive and regressive sedimentary sequences, which is in a good agreement with the sea level fluctuation curves currently accepted for these regions. The interpretation of piezocone test results shows that the sedimentary sequences of Caravelas and Guarujá sites are similar and they have a good correlation to the sea level fluctuation curve accepted for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stratigraphic logging; Piezocone test; Paleoenvironment; Geological mapping.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100017

Monitoring vegetation coverage in Tongren from 2000 to 2016 based on Landsat7 ETM+ and Landsat8
Provedor de dados: 42
Autores: LIU,HUAIPENG; ZHANG,YONGXIN; ZHANG,XIAOPING.
Abstract Vegetation coverage is an important indicator in regional ecological environment monitoring and plays a key role in its quality assessment. We consider Landsat7 ETM+ in 2000 and Landsat8 in 2016 as data sources using a different time phase partial image substitution method to eliminate cloud effects and an NDVI dimidiate pixel model to invert the vegetation coverage of the two time phases. We further classify them into five grades, provide statistics and analyse the areas of different grades at different time periods, while monitoring the spatial evolution of vegetation coverage over the past 16 years in Tongren. Experimental results showed that: (1) the different time phase partial image substitution method could reduce the influence of clouds on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: China Tongren; Landsat7 ETM+; Landsat8; Vegetation coverage; Change detection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602721

Short and long period optimization of drug doses in the treatment of AIDS
Provedor de dados: 42
Autores: CAETANO,MARCO A. L.; YONEYAMA,TAKASHI.
Numerical optimization techniques are useful in solving problems of computing the best inputs for systems described by mathematical models and when the objectives can be stated in a quantitative form. This work concerns the problem of optimizing the drug doses in the treatment of AIDS in terms of achieving a balance between the therapeutic response and the side effects. A mathematical model describing the dynamics of HIV viruses and CD4 cells is used to compute the short term optimal drug doses in the treatments of patients with AIDS by a direct method of optimization using a cost function of Bolza type. The model parameters were fitted to actual published clinical data. In order to simplify the numerical procedures, the control law is expressed as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Simulation; Drugs; Treatment; AIDS.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300002

Influence of seasonal variation on the hydro-biogeochemical characteristics of two upland lakes in the Southeastern Amazon, Brazil
Provedor de dados: 42
Autores: SAHOO,PRAFULLA K.; GUIMARÃES,JOSÉ T.F.; SOUZA-FILHO,PEDRO W.M.; SILVA,MARCIO S. DA; SILVA JÚNIOR,RENATO O.; PESSIM,GUSTAVO; MORAES,BERGSON C. DE; PESSOA,PAULO F.P.; RODRIGUES,TARCÍSIO M.; COSTA,MARLENE F. DA; DALL'AGNOL,ROBERTO.
ABSTRACT Limnological characteristics of the Violão and Amendoim lakes, in the Serra dos Carajás, Amazon, were studied interannually (2013-2014). Climate data indicate anomalous conditions during the 2013 rainy period with higher rainfall and lower temperature in the beginning (November). Lake levels were influenced after the first and second hour of each rainfall, which showed a strong synchronization between seasonal fluctuation of lake levels and local weather patterns. Based on the water quality, both lakes are classified as classes "1" and "2" in the CONAMA (Conselho Nacional do Meio Ambiente) scheme and as "excellent" to "good" in the WQI (Water Quality Index) categories. However, the limnology is distinctly different between the lakes and seasons....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Upland lakes; Water quality; Phytoplankton biomass; Carajás Province.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602211

Shrimps from the Santana Group (Cretaceous: Albian): new species (Crustacea: Decapoda: Dendrobranchiata) and new record (Crustacea: Decapoda: Caridea)
Provedor de dados: 42
Autores: PINHEIRO,ALLYSSON P.; SARAIVA,ANTÔNIO ÁF.; SANTANA,WILLIAM.
The fossil shrimp Araripenaeus timidus n. gen. n. sp. is the first fossil Penaeoidea from Brazil. Here, we describe, illustrate and compare it with Paleomattea deliciosa, a fossil Sergestoidea (Dendrobranchiata) previously described from the same region. The material of the early Cretaceous (Albian) was collected in the town of Jardim, south of the state of Ceará, in the superior septarian concretion level of the Romualdo Formation. Additionally, a second specimen of Kellnerius jamacaruensis was found in the same site of the Araripe Basin.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Romualdo Formation fossil Penaeoidea Araripe Basin Carbonatic concretions; Araripenaeus timidus.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200663

Moderate pathogenic effect of Ligophorus uruguayense (Monogenoidea, Ancyrocephalidae) in juvenile mullet Mugil liza (Actinopterygii, Mugilidae) from Brazil
Provedor de dados: 42
Autores: PAHOR-FILHO,EDUARDO; KLOSTERHOFF,MARTA C.; MARCHIORI,NATALIA C.; PEREIRA JÚNIOR,JOABER.
ABSTRACT Monogenoidea pathogenic activity can elicit various histological responses in fish. Species of Ligophorus are specific parasites of mullets, and its relationship with host fish may result in a moderate pathogenic action. In order to ascertain this relationship, estuarine mullets (Mugil liza) were collected in an estuary, reared in laboratory, for three weeks, and forwarded for histological and parasitological analyses. Ligophorus uruguayense (Monogenoidea) infestation in the gills of the mullets was identified. The severe infestation by only one species of Monogenoidea may result from the specificity of these parasites to mullets. Mullets submitted to histological analysis exhibited respiratory epithelium detachment; mild, moderate and severe...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture; Histological changes; Monogenoidea; Mugilidae; Parasitosis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602997

New classes of polynomial maps satisfying the real Jacobian conjecture in                               ℝ                2
Provedor de dados: 42
Autores: ITIKAWA,JACKSON; LLIBRE,JAUME.
Abstract: We present two new classes of polynomial maps satisfying the real Jacobian conjecture in     ℝ 2. The first class is formed by the polynomials maps of the form (q(x)–p(y), q(y)+p(x)) :     R 2 ⟶   R 2 such that p and q are real polynomials satisfying p'(x)q'(x) ≠ 0. The second class is formed by polynomials maps (f, g):     R 2 ⟶   R 2 where f and g are real homogeneous polynomials of the same arbitrary degree satisfying some conditions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Injective polynomial maps; Global center; Real Jacobian conjecture; Planar Hamiltonian systems.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300202

Diel variation in abundance and size of the seabob shrimp Xiphopenaeus kroyeri (Crustacea, Penaeoidea) in the Ubatuba region, Southeastern Brazil
Provedor de dados: 42
Autores: Simões,Sabrina M.; Costa,Rogerio C.; Fransozo,Adilson; Castilho,Antonio L.
The objective of the present study was to analyze diel variation in the abundance and size of the seabob shrimp Xiphopenaeus kroyeri in the Ubatuba region, state of São Paulo, during the year 2000. In each season of the year, collections were made in the day and at night on 9 transects at depths ranging from 2 to 40 m. The estimated shrimp amount was of 28,878 individuals. Although the catch rate was higher during the day (15,853 shrimp), this did not differ significantly from the catch at night (13,025). The catch rate was higher in daytime on most transects, but was higher at night at locations where fine and very fine sand predominated. The majority of juveniles were caught during the day. The mean size (CL) was 14.43 ± 4.02 mm for day and 14.82 ± 4.28...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Distribution; Penaeidae; Xiphopenaeus kroyeri.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200013

Fatty acid profile in vertical strata of elephant grass subjected to intermittent stocking
Provedor de dados: 42
Autores: DIAS,KAMILA M.; SCHMITT,DANIEL; RODOLFO,GISELLE R.; DESCHAMPS,FRANCISCO C.; CAMARGO,GUILHERME N.; PEREIRA,RAPHAEL S.; SBRISSIA,ANDRÉ F.
ABSTRACT The milk and meat from animals with a pasture-based diet have higher proportions of CLA and C18:3 and lower omega-6:omega-3 ratios than products from animals with diets based on corn silage and concentrate. However, most of the published studies have evaluated fatty acid profiles in temperate climate grasses and the literature with tropical grasses is scarce. Thus, the aim of this study was to evaluate the morphological and fatty acid compositions in the vertical strata of elephant grass (Pennisetum purpureum Schum.) swards subjected to grazing heights (90 or 120 cm pre-grazing heights) and levels of defoliation (50% or 70% removal of the initial pre-grazing height). There were no interactions among pre-grazing height, the level of defoliation and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linolenic acid; Pennisetum purpureum Schum; Polyunsaturated fatty acid; Tropical forage.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401707

Construction and characterization of a recombinant yellow fever virus stably expressing Gaussia luciferase
Provedor de dados: 42
Autores: KASSAR,TELISSA C.; MAGALHÃES,TEREZA; S. JÚNIOR,JOSÉ V.J.; CARVALHO,AMANDA G.O.; SILVA,ANDRÉA N.M.R. DA; QUEIROZ,SABRINA R.A.; BERTANI,GIOVANI R.; GIL,LAURA H.V.G.
ABSTRACT Yellow fever is an arthropod-borne viral disease that still poses high public health concerns, despite the availability of an effective vaccine. The development of recombinant viruses is of utmost importance for several types of studies, such as those aimed to dissect virus-host interactions and to search for novel antiviral strategies. Moreover, recombinant viruses expressing reporter genes may greatly facilitate these studies. Here, we report the construction of a recombinant yellow fever virus (YFV) expressing Gaussia luciferase (GLuc) (YFV-GLuc). We show, through RT-PCR, sequencing and measurement of GLuc activity, that stability of the heterologous gene was maintained after six passages. Furthermore, a direct association between GLuc...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gaussia luciferase; Homologous recombination in yeast; Reporter gene; Yellow fever virus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502119

Salinization risk assessment in irrigated alluvium areas of semi-arid regions
Provedor de dados: 42
Autores: Montenegro,Suzana M.G.L.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400026

Tracking atmospheric dispersion of metals in Rio de Janeiro Metropolitan region (Brazil) with epiphytes as bioindicators
Provedor de dados: 42
Autores: MARQUES JUNIOR,AGUINALDO N.; PANETTO,DOUGLAS P.; LAMEGO,FERNANDO; NEPOMUCENO,FELIPE O.; MONNA,FABRICE; LOSNO,REMI; GUILLON,RODRIGUE.
Abstract The atmospheric dispersion atmospheric plume of the metropolitan region and neighborhoods of the city of Rio de Janeiro was investigated through elemental analyzes (Na, K, Al, Mn, Pb, Ni, Cr) and stable lead isotopes in two epiphytes; the lichen Parmotrema crinitum (Ach.) and the bromeliad Tillandsia usneoides (L.). All the elements had lower concentrations in epiphytes than in rocks of the local geological basement, with the exception of K, which was similar to rocks. This behavior was attributed to the nutritional essentiality and abundance of this element in the environment. The concentrations of Na, Pb and the 206Pb/207Pb and 208Pb/206Pb ratios indicated the presence of spatial gradients in the path (a) sea shore → continent, and (b) urban...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stable lead isotopes; Atmospheric pollution; Parmotrema crinitum (Ach.); Tillandsia usneoides (L.).
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602991

The ubiquitous gp63-like metalloprotease from lower trypanosomatids: in the search for a function
Provedor de dados: 42
Autores: Santos,André L.S.; Branquinha,Marta H.; D'Avila-Levy,Claudia M.
Plant and insect trypanosomatids constitute the "lower trypanosomatids", which have been used routinely as laboratory models for biochemical and molecular studies because they are easily cultured under axenic conditions, and they contain homologues of virulence factors from the classic human trypanosomatid pathogens. Among the molecular factors that contribute to Leishmania spp. virulence and pathogenesis, the major surface protease, alternatively called MSP, PSP, leishmanolysin, EC 3.4.24.36 and gp63, is the most abundant surface protein of Leishmania promastigotes. A myriad of functions have been described for the gp63 from Leishmania spp. when the metacyclic promastigote is inside the mammalian host. However, less is known about the functions performed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosomatidae; Lower trypanosomatids; Gp63; Invertebrate host; Adhesion; Nutrition; Protease.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400006

Preliminary phytochemical screening and molluscicidal activity of the aqueous extract of Bidens pilosa Linné (Asteraceae) in Subulina octona (Mollusca, Subulinidade)
Provedor de dados: 42
Autores: SOUZA,BRUNA A.; SILVA,LIDIANE C. DA; CHICARINO,EVELYN D.; BESSA,ELISABETH C. A.
The aim of this study was to establish reference concentrations (LC50 e LC90) of aqueous extracts of Bidens pilosa on the land snail Subulina octona, in order to assess the changes caused by 24 and 48 h exposure to the sublethal concentration regarding species' fecundity, hatchability and in offspring produced after exposure to confirm the presence of tannins, saponins and flavonoids in this plant species. Eggs newly hatched and 30 day-old snails were exposed to sublethal concentration, calculated for adults. The phytochemical analysis confirmed the presence of flavonoids, condensed tannins and saponins in the aqueous extract of B. pilosa. The LC50 and LC90 obtained were 51.4mg-mL and 74.1mg-mL respectively. The exposure to sublethal concentration reduced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural pest control land sn; Ail molluscicide vegetable extract.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401557

Extracting DNA of nematodes communities from Argentine Pampas agricultural soils
Provedor de dados: 42
Autores: Mondino,Eduardo A.; Covacevich,Fernanda; Studdert,Guillermo A.; Pimentel,João P.; Berbara,Ricardo L.L.
We examined four strategies (Tris/EDTA, sodium dodecyl sulfate, Chelex 100 resin and cetyltrimethylammonium bromide -CTAB-) for extracting nucleic acid (DNA) from communities of nematodes. Nematodes were isolated from an agricultural area under different management of long-term crop rotation experiment from Argentina during three seasons. After DNA extraction, Polymerase Chain Reaction-amplifications were performed and considered as indicators of successful DNA extraction. The CTAB combined with proteinase K and phenol-chloroform-isoamyl alcohol was the unique successful method because positive amplifications were obtained by using both eukaryotic and nematode specific primers. This work could contribute to biodiversity studies of nematodes on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroecosystems; Nematodes; Nucleic acid extraction; CTAB.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200691

Didelphidae marsupials (Mammalia, Didelphimorphia) from the Late Pleistocene deposit of the Gruta dos Moura Cave, northern Brazil
Provedor de dados: 42
Autores: Nova,Patricia Villa; Avilla,Leonardo S.; Oliveira,Édison V.
The present study acknowledges the diversity of fossil marsupials from the Gruta dos Moura cave, as well as environmental and climatic aspects during the Quaternary. The results show that this is the largest diversity of Pleistocene marsupials recorded in a single cave: Didelphis albiventris, D. aurita, Gracilinanus agilis, G. microtarsus, Marmosa murina, Monodelphis brevicaudata, M. domesticaand Sairadelphys tocantinensis. Furthermore, the described specimens are also part of the only fossil assemblage unequivocally referable to the late Pleistocene. Paleontological studies suggest an intimate association with dry and open environments with high abundance of water sources. Since most of the identified taxa are characteristic of open forests and gallery...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammals; Didelphidae; Marsupials; Northern Brazil; Quaternary; Late Pleistocene.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100193

Remarks on the enchodontid fishes from the Atlântida Formation, Pelotas Basin
Provedor de dados: 42
Autores: COELHO,PABLO M.; GALLO,VALÉRIA; FIGUEIREDO,FRANCISCO J. DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200015

Reversible-equivariant systems and matricial equations
Provedor de dados: 42
Autores: Teixeira,Marco A; Martins,Ricardo M.
This paper uses tools in group theory and symbolic computing to classify the representations of finite groups with order lower than, or equal to 9 that can be derived from the study of local reversible-equivariant vector fields in &lt;img border=0 width=32 height=32 src="../../../../img/revistas/aabc/v83n2/carr.jpg" align=absmiddle&gt;4 . The results are obtained by solving matricial equations. In particular, we exhibit the involutions used in a local study of reversible-equivariant vector fields. Based on such approach we present, for each element in this class, a simplified Belitskii normal form.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reversible-equivariant dynamical systems; Involutory symmetries; Normal forms.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200003

Mammalian cell invasion and intracellular trafficking by Trypanosoma cruzi infective forms
Provedor de dados: 42
Autores: Mortara,Renato A.; Andreoli,Walter K.; Taniwaki,Noemi N.; Fernandes,Adriana B.; Silva,Claudio V. da; Fernandes,Maria Cecília D.C.; L'abbate,Carolina; Silva,Solange da.
Trypanosoma cruzi, the etiological agent of Chagas’ disease, occurs as different strains or isolates that may be grouped in two major phylogenetic lineages: T. cruzi I, associated with the sylvatic cycle and T. cruzi II, linked to the human disease. In the mammalian host the parasite has to invade cells and many studies implicated the flagellated trypomastigotes in this process. Several parasite surface components and some of host cell receptors with which they interact have been identified. Our work focused on how amastigotes, usually found growing in the cytoplasm, can invade mammalian cells with infectivities comparable to that of trypomastigotes. We found differences in cellular responses induced by amastigotes and trypomastigotes regarding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Cellular invasion; Amastigotes; Trypomastigotes; Parasitophorous vacuole escape; Trafficking; Coxiella burnetii; Phylogenetic lineages.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100006

Infinitesimal initial part of a singular foliation
Provedor de dados: 42
Autores: Corral,Nuria.
This work provides a necessary and sufficient condition to assure that two generalized curve singular foliations have the same reduction of singularities and same Camacho-Sad indices at each infinitely near point.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Singular holomorphic foliations; Complex dynamics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400002

Cnidom variation through distinct developmental stages in the sea anemone Aulactinia marplatensis (Zamponi, 1977) (Cnidaria: Actiniaria)
Provedor de dados: 42
Autores: GARESE,AGUSTÍN; GONZÁLEZ-MUÑOZ,RICARDO; ACUÑA,FABIÁN H.
The cnidae are the exclusive diagnostic structures of phylum Cnidaria. The inventory of all cnidae types of a particular species is called the cnidom. The study of cnidae has been widely addressed in all classes of cnidarians. Particularly in the order Actiniaria (sea anemones), the study of the composition, size and distribution of cnidae is essential to the identification and description of species. In the present study, we examine the cnidom of the sea anemone Aulactinia marplatensis in three different stages of development throughout its life cycle. We found that the composition and abundance patterns are very similar between the adult and juvenile stages, although significant differences in the size capsules were found between both stages and in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cnidae; Cnidocysts; Larval cnidom; Life cycle; Sea anemones.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100613

Olfactory deficit as a result of clozapine withdrawal syndrome in an animal model of schizophrenia: preliminary results
Provedor de dados: 42
Autores: PACHECO,FELIPE D.; SILVA,MAURICIO L. DA; BATISTA,GRAZIELA; SANTOS,WITÓRIA; CASTRO,ADALBERTO A. DE; CANEVER,LARA; ZUGNO,ALEXANDRA I.
ABSTRACT Clozapine is an antipsychotic that produces serious withdrawal effects in schizophrenic patients. Olfactory deficits are well known as part of negative symptoms, but it is not known whether antipsychotic use and/or withdrawal are implicated. Then, we tested clozapine withdrawal in association with two widely used schizophrenia models: Neonatal immune challenge by Polycitidilic-polyinosinic acid (polyI:C) and ketamine. PolyI:C (or saline) was injected subcutaneously in neonatal period, dose of 5 mg/kg from 2 to 6 Post Natal Days, and ketamine or saline at the dose 25mg/kg intraperitoneally (i.p.), daily for 7 days from 53 to 60 post natal day. Clozapine 10mg/kg (or saline) was administered i.p. from 46 to 60 post natal day. Olfactory discrimination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Olfactory deficit; Clozapine; Schizophrenia; Animal model.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401659

The overexpression of SOX2 affects the migration of human teratocarcinoma cell line NT2/D1
Provedor de dados: 42
Autores: DRAKULIC,DANIJELA; VICENTIC,JELENA MARJANOVIC; SCHWIRTLICH,MARIJA; TOSIC,JELENA; KRSTIC,ALEKSANDAR; KLAJN,ANDRIJANA; STEVANOVIC,MILENA.
The altered expression of the SOX2 transcription factor is associated with oncogenic or tumor suppressor functions in human cancers. This factor regulates the migration and invasion of different cancer cells. In this study we investigated the effect of constitutive SOX2 overexpression on the migration and adhesion capacity of embryonal teratocarcinoma NT2/D1 cells derived from a metastasis of a human testicular germ cell tumor. We detected that increased SOX2 expression changed the speed, mode and path of cell migration, but not the adhesion ability of NT2/D1 cells. Additionally, we demonstrated that SOX2 overexpression increased the expression of the tumor suppressor protein p53 and the HDM2 oncogene. Our results contribute to the better understanding of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adhesion; HDM2; Migration; P53; SOX2; Wound healing.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100389

Perceptions of Graduate Students at the University of São Paulo about Plagiarism Practices in Academic Works
Provedor de dados: 42
Autores: KROKOSCZ,MARCELO; FERREIRA,SUELI M.S.P.
Abstract: Our objective was to identify the understanding of theoretical aspects and the interpretation of practical situations that a sample of 3,623 graduate students (Population = 22,438) at the University of São Paulo (Brazil) have regarding academic plagiarism. The survey used an electronic questionnaire containing 30 multiple choice questions developed from the literature concerning the concept and definition of plagiarism, occurrence modality, types of plagiarism, reasons for occurrence, standards and preventive actions adopted. We identified that the fact of respondents agreeing or disagreeing with the theoretical-conceptual characteristics of plagiarism did not make a difference in their capacity of correctly assessing practical situations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Academic plagiarism; Graduate students; Research integrity; Writing skills.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000301001

The Piumhi Supergroup, SW-São Francisco Craton, MG-Brazil
Provedor de dados: 42
Autores: CHIARINI,ALEXANDRE P.; SCHORSCHER,HANS D.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300021

Yellow sweet potato flour: use in sweet bread processing to increase β-carotene content and improve quality
Provedor de dados: 42
Autores: NOGUEIRA,AMANDA C.; SEHN,GEORGIA A.R.; REBELLATO,ANA PAULA; COUTINHO,JANCLEI P.; GODOY,HELENA T.; CHANG,YOON K.; STEEL,CAROLINE J.; CLERICI,MARIA TERESA P.S.
ABSTRACT Yellow sweet potato is mostly produced by small farmers, and may be a source of energy and carotenoids in the human diet, but it is a highly perishable crop. To increase its industrial application, yellow sweet potato flour has been produced for use in bakery products. This study aimed to evaluate the technological quality and the carotenoids content in sweet breads produced with the replacement of wheat flour by 0, 3, 6, and 9% yellow sweet potato flour. Breads were characterized by technological parameters and β-carotene levels during nine days of storage. Tukey’s test (p&lt;0.05) was used for comparison between means. The increase in yellow sweet potato flour concentrations in bread led to a decrease of specific volume and firmness, and an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baking; Carotenoids; Tubers; Healthiness; Agribusiness.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100283

Morphological aspects of Clinostomidae metacercariae (Trematoda: Digenea) in Hoplerytrinus unitaeniatusand Hoplias malabaricus (Pisces: Erythrinidae) of the Neotropical region, Brazil
Provedor de dados: 42
Autores: BENIGNO,RAIMUNDO N.M.; KNOFF,MARCELO; MATOS,EDILSON R.; GOMES,DELIR C.; PINTO,ROBERTO M.; CLEMENTE,SÉRGIO C. SÃO.
Species of fish of Marajó Island, State of Pará, Brazil, were examined to identify the trematodes parasitizing 102 Hoplerytrinus unitaeniatus (gold wolf fish) and 104 Hoplias malabaricus (thraira). Metacercariae of two species of trematodes, 170 specimens of Clinostomatopsis sorbens and 10 Ithyoclinostomum dimorphum were found and identified. The parasitary indices of C. sorbens from H. unitaeniatus and H. malabaricus, were 43.14% and 30.77% for prevalence, 2.52 and 1.84 for mean intensity, 1.09 and 0.57 for mean abundance and 1 to 9 and 1 to 7 for range of infection, respectively, on both fish the site of infection was the mesentery. The parasitary indices of I. dimorphum from H. unitaeniatus were 2.94% for prevalence, 2.66 for mean intensity, 0.08 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clinostomidae; Hoplerytrinus unitaeniatus; Hoplias malabaricus; Brazil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200733

Use of convolution and geotechnical rock properties to analyze free flowing discharge test
Provedor de dados: 42
Autores: WENDLAND,EDSON; GOMES,LUIS HENRIQUE; PORTO,RODRIGO M.
Discharge tests are conducted in order to determine aquifers transmissivity (T) and storage coefficient (S). However the interpretation of test data is not unique and the results may vary depending on adopted hypothesis. In this work, the convolution technique is applied for the reconstruction of observed drawdown curves aiming for the reduction of uncertainty. The interference between a flowing well and an observation well is evaluated in order to determine the hydrogeological parameters of the confined Guarani Aquifer System (Araujo et al. 1999). Discharge test data are analyzed according to the Jacob and Lohman (1952)method. The application of convolution enabled the determination of the most reliable solution. Obtained transmissivity (T = 411.0 m2/d)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrogeology; Groundwater; Transmissivity; Storage coefficient; Pumping test.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100117

Silica enrichment, graphic granite and aquamarine growth: a new exploration guide
Provedor de dados: 42
Autores: RAO,A. BHASKARA.
Granitic pegmatites are traditionally known to contain graphic, perthitic and myrmekitic intergrowths related to quartz and K- and Na- feldspars. They are further considered to characterise the pegmatite types distinguishing them from the granites and other related plutonic rock types. Graphic granite is accepted also as a synonym to granitic pegmatite. Systematic studies, by the author and colleagues, on the granitic pegmatite gem deposits have permitted the definition of two aquamarine gem provinces in ENE Brazil, one in the NeoProterozoic and the other in the Archaean sequences. Potash feldspars in the pegmatites in the former show perthitic intergrowths, whereas in the latter graphic intergrowth dominates with anomalously coarse centimetric quartz...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archaean terrain; Quartz veins; Pegmatite deposits; Graphic intergrowth; Aquamarines.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300014

Satellite Telemetry and Image Reception with Software Defined Radio Applied to Space Outreach Projects in Brazil
Provedor de dados: 42
Autores: PERALTA,DAVID JULIAN M.; SANTOS,DOUGLAS S. DOS; TIKAMI,AURO; SANTOS,WALTER A. DOS; PEREIRA,EDSON W.R.
Abstract Software Defined Radio (SDR) uses a processor, a special receiver and software that play the main parts of the receiver (mixer, filters, amplifiers, modulators, demodulators, etc.) and it is quite advantageous for its flexibility and compact size as it reduces the amount of hardware components while adapting for different needs. This work briefly presents the SDR concept and approach for obtaining satellite telemetries and imagery in the context of different modulation schemes, link budget requirements and different satellites types. Two case studies are presented for supporting affordable ground segment and promoting satellites projects in Brazil. Reception from the 1st Brazilian picosatellite, Tancredo-1, with specific software developed, UbaTM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ground stations; Satellites; Software Defined Radio; Space systems.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603175

Pollen morphology and viability in Bromeliaceae
Provedor de dados: 42
Autores: SOUZA,EVERTON H.; SOUZA,FERNANDA V.D.; ROSSI,MÔNICA L.; PACKER,RENAN M.; CRUZ-BARROS,MARIA AMELIA V.; MARTINELLI,ADRIANA P.
ABSTRACT Pollen morphology characterization is important in taxonomy, conservation and plant breeding, and pollen viability studies can support breeding programs. This study investigated pollen morphology and male fertility in 18 species of Bromeliaceae with ornamental potential. For morphological characterization, pollen grains were acetolyzed and characterization of exine was done using scanning and transmission electron microscopy. Pollen viability was investigated by in vitro germination and histochemical tests. Species belonging to Aechmea and Ananas genera presented medium size pollen, except for Ae. fasciata, with large pollen. Al. nahoumii, P. sagenarius and the Vriesea species analyzed showed large pollen, except for V. carinata, with very large...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aechmea; Alcantarea; Ananas; In vitro pollen germination; Histochemical test; Vriesea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603067

The Sm-Nd isotopic method in the geochronology laboratory of the University of Brasília
Provedor de dados: 42
Autores: GIOIA,S.M.C.L.; PIMENTEL,M.M.
Nd isotopes represent one of the best tools to investigate the processes involved in the evolution of the continental crust and mantle. This is due mainly to the similar geochemical behaviour of Sm and Nd, both light rare earth elements, which inhibits their fractionation during most varied geological processes. In order to carry out crustal evolution studies in central Brazil, the Sm-Nd isotopic method was implanted at the Geochronology Laboratory of the University of Brasília. The Sm-Nd separation methodology is basically that described in Richard et al. (1976), with the addition of some improvements. In this study we describe in detail the methodology used in Brasília. Precision and accuracy were checked with the international standards such as JB-3,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sm-Nd method; Isotope dilution; Ion exchange chromatography; TIMS.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200009

Growth of cactus pear cv. Miúda under different salinity levels and irrigation frequencies
Provedor de dados: 42
Autores: FREIRE,JOELMA DE L.; SANTOS,MÉRCIA VIRGINIA F. DOS; DUBEUX JÚNIOR,JOSÉ CARLOS B.; BEZERRA NETO,EGÍDIO; LIRA,MÁRIO DE A.; CUNHA,MÁRCIO V. DA; SANTOS,DJALMA C. DOS; AMORIM,SILVANIA O. DE; MELLO,ALEXANDRE CARNEIRO L. DE.
Abstract Soil and water salinity are considered the main limiting factors of plant production. This work aimed to evaluate the influences of irrigation frequency and soil salinity on the development of cactus pear cv. Miúda (Nopalea cochenillifera Salm Dyck). The experiment was conducted in factorial arrangement of four salinity levels: 0.3 (control), 0.5 (low), 1.5 (medium) and 3.6 (high salinity) (ds m-1), associated with four irrigation frequencies (each 7, 14, 21 and 28 days) and two soil textures (sandy and sandy loam) in a randomized block design with four replicates. One cladode was planted in each polyethylene pot containing 10 kg of soil. The soil texture influenced some of the morphological characteristics of the cactus pear, so that plants grown...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cladodes; Forage; Salt stress; Semiarid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703893

Two-dimensional map of direction selectivity in cortical visual area MT of Cebus monkey
Provedor de dados: 42
Autores: DIOGO,ANTONIA CINIRA M.; SOARES,JULIANA G. M.; ALBRIGHT,THOMAS D.; GATTASS,RICARDO.
We studied the spatial organization of direction of motion in visual area MT of the Cebus apella monkey. We used arrays of 6 (700 µm apart) parallel electrodes in penetrations tangential to the cortical layers to record multi-unit responses to moving bars, at 200 µm steps. We determined the direction selectivity at each recording site. The data from single penetrations showed cyclic and gradual changes in the direction selectivity of clusters of cells, intermixed with abrupt 180º discontinuities along the electrode track. In order to obtain maps of direction of motion selectivity, we examined the spatial distribution of direction of motion in MT and we applied a method to determine the location of the centers of radial arrangements of direction...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extrastriate cortex; Visual system; Primates; Direction of motion.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300009

One-eye-set sugarcane susceptibility to weed interference
Provedor de dados: 42
Autores: BELUCI,LUCAS R.; BACHA,ALLAN L.; BARROSO,ARTHUR A.M.; ALVES,PEDRO LUIS C.A.
Abstract The new technology of sugarcane planting, known as one-eye-set seedlings, offer a high standard of plant health and vegetative vigor. However, there are no reports in the literature that evaluate the weed competition with one-eye-set sugarcane seedlings, and the periods in which weed communities need to be controlled in this system. Two interference experiments were conducted in field conditions. The first experiment determined the periods of weed interference of an infesting community predominated by Ipomoea hederifolia and Merremia aegyptia in sugarcane. In the second experiment, these same species competed with plants of the same sugarcane cultivar. Productivity and qualitative aspects of production were evaluated. The critical period of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Critical period of interference prevention; Competition; Morning glory species; Periods of interference; Sugarcane OES.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703513

Nicotine-enhanced oxidation of low-density lipoprotein and its components by myeloperoxidase/H2O2/Cl- system
Provedor de dados: 42
Autores: Oliveira,Olga M.M.F.; Brunetti,Iguatemy L.; Khalil,Najeh M.
In this study, the effect of nicotine on the LDL oxidation by the MPO/H2O2/Cl- system and the effect of HOCl on LDL and some of its components, such as methyl linoleate, vitamin E and the amino acid tryptophan were explored. Nicotine, in micromolar concentrations, enhanced the tryptophan oxidation, either present in LDL or free, in solution. Nicotine also decreased the formation of conjugated dienes and oxygen consumption in a methyl linoleate / HOCl system, and there was evidence to suggest an increase in chlorohydrin formation. Acceleration of the vitamin E oxidation by HOCl was also observed in the presence of nicotine. These data show that the interaction of nicotine and HOCl can promote significant biochemical modifications in LDL particle and some of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nicotine; Myeloperoxidase; Hypochlorous acid; Low-density lipoprotein; Methyl linoleate; Vitamin E; Tryptophan.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100183

Tesselated pavements related to post-depositional structures
Provedor de dados: 42
Autores: Hachiro,Jorge.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400011

Innovative molecular approach to the identification of Colossoma macropomum and its hybrids
Provedor de dados: 42
Autores: Gomes,Fátima; Schneider,Horacio; Barros,Claudene; Sampaio,Dioniso; Hashimoto,Diogo; Porto-Foresti,Fábio; Sampaio,Iracilda.
Tambaqui (Colossoma macropomum) is the fish species most commonly raised in the Brazilian fish farms. The species is highly adaptable to captive conditions, and is both fast-growing and relatively fecund. In recent years, artificial breeding has produced hybrids with Characiform species, known as "Tambacu" and "Tambatinga". Identifying hybrids is a difficult process, given their morphological similarities with the parent species. This study presents an innovative molecular approach to the identification of hybrids based primarily on Multiplex PCR of a nuclear gene (α-Tropomyosin), which was tested on 93 specimens obtained from fish farms in northern Brazil. The sequencing of a 505-bp fragment of the Control Region (CR) permitted the identification of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisciculture; Multiplex PCR; Mitochondrial DNA; Genetic bottleneck.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200020

Antioxidant activity and flavonoid content of Clusia fluminensis Planch. &amp;amp; Triana
Provedor de dados: 42
Autores: Silva,Maria Carolina A. da; Paiva,Selma R.
Clusia fluminensis Planch. &amp;amp; Triana (Clusiaceae Lindl.) is a native species found in regions of high luminosity and water restriction. The aim of this study was to evaluate the antioxidant activity of Clusia fluminensis crude extracts through the scavenging of the stable free radical DPPH, and the determination of flavones and flavonols content in these extracts. The fruit acetonic extract showed the lowest EC50 value (2.71 ± 0.34 g extract / g DPPH), the lowest percentage of remaining DPPH at the concentrations of 125 and 250 µg/mL (about 4% in both), and also the greatest percentage of flavones and flavonols (13.93 ± 0.21 %). Statistical analysis suggests a positive correlation between the presence of flavonoids and the antioxidant activity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum chloride; Clusia fluminensis; DPPH; Flavonoids.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300004

Ulinastatin attenuates vascular endothelial cell damage in pregnant women with severe pre-eclampsia
Provedor de dados: 42
Autores: YU,ZHIQIANG; WANG,JIANBO; ZHANG,PEIJUN; DING,WEI.
Abstract: The use of ulinastatin for pancreatitis and sepsis have been described. This study was designed to evaluate the effect of ulinastatin on vascular endothelial cell damage and coagulation in pregnant women with severe pre-eclampsia (PE).From October 2015 to November 2017 at Tianjin Central Hospital of gynecology and obstetrics in China. Eighty pregnant women with severe PE, who elected to deliver by cesarean section, were randomly assigned to a control group or an ulinastatin group. The plasma concentration of von Willebrand factor (vWF) and platelet granule membrane protein (GMP-140), platelet count, fibrinogen levels, prothrombin time (PT), and partial prothrombin activation time (APTT) were recorded before combined spinal-epidural anesthesia and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ulinastatin; Pre-eclampsia; Blood protection; VWF.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500807

Contiguous urban rivers should not be necessarily submitted to the same management plan: the case of Tietê and Pinheiros Rivers (São Paulo-Brazil)
Provedor de dados: 42
Autores: Cunha,Davi G. F.; Grull,Doron; Damato,Murilo; Blum,José R. C.; Eiger,Sergio; Lutti,José E.I.; Mancuso,Pedro C. S.
The management of urban water resources plays an important role for developing countries. The Tietê and Pinheiros Rivers (São Paulo, Brazil) are affected by domestic and industrial effluents and by the diffuse pollution. This research aimed to quantify 134 variables in the water of Tietê and Pinheiros Rivers (approximately 7,200 and 6,600 analyses, respectively) from August 2007 to December 2008. The idea was to verify if the fact that both rivers are located in the same basin is enough to consider the application of a single management plan for both. Data showed that the rivers presented significant anthropogenic interference. The results suggested that such rivers must be subjected to individual management plans since there were exclusive occurrences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental monitoring; Metropolitan region of São Paulo (MRSP); Urban rivers; Water pollution; Water quality; Watershed management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400032

Chemical, enzymatic and cellular antioxidant activity studies of Agaricus blazei Murrill
Provedor de dados: 42
Autores: HAKIME-SILVA,RICARDO A.; VELLOSA,JOSÉ C.R.; KHALIL,NAJEH M.; KHALIL,OMAR A.K.; BRUNETTI,IGUATEMY L.; OLIVEIRA,OLGA M.M.F.
Mushrooms possess nutritional and medicinal properties that have long been used for human health preservation and that have been considered by researchers as possible sources of free radical scavengers. In this work, the antioxidant properties of water extracts from Agaricus blazei Murill, produced by maceration and decoction, are demonstrated in vitro. Resistance to oxidation is demonstrated through three mechanisms: i) inhibition of enzymatic oxidative process, with 100% inhibition of HRP (horseradish peroxidase) and MPO (myeloperoxidase); ii) inhibition of cellular oxidative stress, with 80% inhibition of the oxidative burst of polymorphonuclear neutrophils (PMNs); and iii) direct action over reactive species, with 62% and 87% suppression of HOCl and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agaricus blazei Murrill; Antioxidant; Oxidant species; Chemiluminescence; Polymorphonuclear neutrophils.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301073

Population structure and allometry of Podocnemis unifilis (Testudines, Podocnemididae) in a protected area upstream Belo Monte dam in Xingu River, Brazil
Provedor de dados: 42
Autores: MIORANDO,PRISCILA S.; GIARRIZZO,TOMMASO; PEZZUTI,JUAREZ C.B.
ABSTRACT Amazon river turtles are increasingly threatened by habitat loss and alteration due to the Brazilian energy policy based on construction of hydroelectric dams, meanwhile, populational studies remain scarce. We described the population structure, and established body allometric relationships of Podocnemis unifilis in the Terra do Meio Ecological Station in the Iriri River, tributary of the Xingu River upstream the Belo Monte dam under construction Turtles were captured by hand net and diving in 2012 and 2013 dry seasons, and 2013 rainy season. A total of 728 males, 296 females and four juveniles were captured. Adult sex ratio was male-biased by 9.15♂:1&amp;#9792;. Females were significantly larger than males. Mean straight carapace length was 268.9...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Clear water river; Length-weight relationship; Sex ratio; Tracajá.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502067

Population dynamics of Aphis gossypii Glover and in sole and intercropping systems of cotton and cowpea
Provedor de dados: 42
Autores: FERNANDES,FRANCISCO S.; GODOY,WESLEY A.C.; RAMALHO,FRANCISCO S.; GARCIA,ADRIANO G.; SANTOS,BÁRBARA D.B.; MALAQUIAS,JOSÉ B.
ABSTRACT Population dynamics of aphids have been studied in sole and intercropping systems. These studies have required the use of more precise analytical tools in order to better understand patterns in quantitative data. Mathematical models are among the most important tools to explain the dynamics of insect populations. This study investigated the population dynamics of aphids Aphis gossypii and Aphis craccivora over time, using mathematical models composed of a set of differential equations as a helpful analytical tool to understand the population dynamics of aphids in arrangements of cotton and cowpea. The treatments were sole cotton, sole cowpea, and three arrangements of cotton intercropped with cowpea (t1, t2 and t3). The plants were infested with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphids; Cotton; Cowpea; Dynamics; Mathematical models.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100311

Erratum
Provedor de dados: 42
Tipo: Info:eu-repo/semantics/other
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101501

Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations
Provedor de dados: 42
Autores: Marzinek,Juliana; Oliveira,Denise M.T.
The ontogeny of cypselae and their accessory parts were examined using light and scanning electron microscopy for the species Campuloclinium macrocephalum, Chromolaena stachyophylla, Mikania micrantha, Praxelis pauciflora, Symphyopappus reticulatus, and Vittetia orbiculata, some of these being segregated from the genus Eupatorium. A layer of phytomelanin observed in the fruit appears to be secreted by the outer mesocarp into the schizogenous spaces between the outer and inner mesocarp; its thickness was observed to vary among the different species examined. The bristles of the pappus are vascularized, except in M micrantha, and have cells that are superficially projected and arranged acropetally; in S. reticulatus some of the projections are retrorse and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Asteraceae; Carpopodium; Fruit; Pappus; Phytomelanin.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200004

Slope variation and population structure of tree species from different ecological groups in South Brazil
Provedor de dados: 42
Autores: Bianchini,Edmilson; Garcia,Cristina C.; Pimenta,José A.; Torezan,José M.D.
Size structure and spatial arrangement of 13 abundant tree species were determined in a riparian forest fragment inParaná State, South Brazil (23"16'S and 51"01'W). The studied species were Aspidosperma polyneuron Müll. Arg., Astronium graveolens Jacq. and Gallesia integrifolia (Spreng) Harms (emergent species); Alseis floribunda Schott, Ruprechtia laxiflora Meisn. and Bougainvillea spectabilis Willd. (shade-intolerant canopy species); Machaerium paraguariense Hassl, Myroxylum peruiferum L. and Chrysophyllum gonocarpum (Mart. &amp;amp; Eichler ex Miq.) Engl. (shade-tolerant canopy species); Sorocea bonplandii (Baill.) Bürger, Trichilia casaretti C. Dc, Trichilia catigua A. Juss. and Actinostemon concolor (Spreng.) Müll. Arg. (understory small trees...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diameter structure; Ecological groups; Forest fragment; Seasonal semideciduous forest; Spatial pattern.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300012

Investigating accessibility in Latin American science museums and centers
Provedor de dados: 42
Autores: ROCHA,JESSICA NORBERTO; MASSARANI,LUISA; ABREU,WILLIAN VIEIRA DE; INACIO,LUIZ GUSTAVO BARCELLOS; MOLENZANI,ALINE OLIVEIRA.
Abstract  Science museums are powerful places not only for science communication, informal science teaching, and leisure but also for promoting science and technology in an equitable, diverse, and inclusive mode. The paper presents an overview of accessibility in Latin American science museums and centers, based on a questionnaire comprised of open and closed questions in Portuguese and Spanish. The answers received from directors and other personnel responsible for 109 institutions in twelve countries were analyzed using an accessibility indicator tool. The findings suggest that these institutions generally offer some physical accessibility resources and fewer communicational and attitudinal accessibility resources. Data also show that there is an absence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accessibility; Inclusion; Science communication; Science museums.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101204

Karyotype analysis in Bignonieae (Bignoniaceae): chromosome numbers and heterochromatin
Provedor de dados: 42
Autores: CORDEIRO,JOEL M.P.; KAEHLER,MIRIAM; SOUZA,GUSTAVO; FELIX,LEONARDO P.
ABSTRACT Chromosome numbers and heterochromatin banding pattern variability have been shown to be useful for taxonomic and evolutionary studies of different plant taxa. Bignonieae is the largest tribe of Bignoniaceae, composed mostly by woody climber species whose taxonomies are quite complicated. We reviewed and added new data concerning chromosome numbers in Bignonieae and performed the first analyses of heterochromatin banding patterns in that tribe based on the fluorochromes chromomycin A3 (CMA) and 4’-6-diamidino-2-phenylindole (DAPI). We confirmed the predominant diploid number 2n = 40, as well as variations reported in the literature (dysploidy in Mansoa [2n = 38] and polyploidy in Dolichandra ungis-cati [2n = 80] and Pyrostegia venusta [2n = 80])....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotaxonomy; Fluorochromes; Neotropical lianas; Ploidy variation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602697

Histopatology of the reproductive tract of Nellore pubertal heifers with genital ureaplasmosis
Provedor de dados: 42
Autores: PÔRTO,REGIANI; OLIVEIRA FILHO,BENEDITO; FERRAZ,HENRIQUE; CAIXETA,LUCIANO; VIU,MARCO ANTONIO; GAMBARINI,MARIA LÚCIA.
ABSTRACT In order to study and characterize the lesions in the reproductive tract of Nellore heifers naturally infected with Ureaplasma diversum and presenting granular vulvovaginitis syndrome (GVS), fragments of uterine tube, uterus, cervix, vagina and vulva of 20 animals were evaluated. The macroscopic lesions of the vulvovaginal mucosa were classified in scores of “1” mild, until “4”, severe inflammation and pustular or necrotic lesions. The histopathological evaluation was performed using scores of “1” to “4”, according to the inflammatory alterations. The fragments with severe microscopic lesions (3 and 4) were from the uterine tubes and uterus, which showed leukocytes infiltration and destruction and/or necrosis of epithelium. Alterations in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine; Tissue evaluation; Reproduction; Ureaplasma diversum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602987

Semi-automated counting model for arbuscular mycorrhizal fungi spores using the Circle Hough Transform and an artificial neural network
Provedor de dados: 42
Autores: MELO,CLÊNIA A.O. DE; LOPES,JULIANE G.; ANDRADE,ALEXSANDRA O.; TRINDADE,ROQUE M.P.; MAGALHÃES,ROBSON S.
Abstract: Arbuscular Mycorrhizae (AM) are mutualistic associations between Arbuscular Mycorrhizal Fungi (AMF) and the roots of many plant species. AMF spores give rise to filaments that develop in the root system of plants and contribute to the absorption of water and some nutrients. This article introduces a semi-automated counting model of AMF spores in slide images based on Artificial Neural Network (ANN). The semi-automated counting of AMF spores facilitates and accelerates the tasks of researchers, who still do the AMF spore counting manually. We built a representative database of spore images, processing images through the Circle Hough Transform (CHT) method and training an ANN to classify patterns automatically. The classification analysis and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arbuscular mycorrhizal fungi spores; Artificial neural network; Circle Hough transform; Image preprocessing; Pattern classification; Semi-automated counting.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700901

Development of the Atlantic Forest in Rio de Janeiro, the oldest known Neotropical plant and biogeography of megaherbivores during the Late Pleistocene in South America
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200441

Groundwater resources in Brazil: a review of possible impacts caused by climate change
Provedor de dados: 42
Autores: Hirata,Ricardo; Conicelli,Bruno P.
Groundwater has a strategic role in times of climate change mainly because aquifers can provide water for long periods, even during very long and severe drought. The reduction and/or changes on the precipitation pattern can diminish the recharge mainly in unconfined aquifer, causing available groundwater restriction. The expected impact of long-term climate changes on the Brazilian aquifers for 2050 will lead to a severe reduction in 70% of recharge in the Northeast region aquifers (comparing to 2010 values), varying from 30% to 70% in the North region. Data referring to the South and Southeast regions are more favorable, with an increase in the relative recharge values from 30% to 100%. Another expected impact is the increase in demand and the decrease in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Groundwater; Aquifer recharge; Integrated use of water; Water resources management.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200006

FISH-mapping of the 5S rDNA locus in chili peppers (Capsicum-Solanaceae)
Provedor de dados: 42
Autores: AGUILERA,PATRICIA M.; DEBAT,HUMBERTO J.; SCALDAFERRO,MARISEL A.; MARTÍ,DARDO A.; GRABIELE,MAURO.
ABSTRACT We present here the physical mapping of the 5S rDNA locus in six wild and five cultivated taxa of Capsicum by means of a genus-specific FISH probe. In all taxa, a single 5S locus per haploid genome that persistently mapped onto the short arm of a unique metacentric chromosome pair at intercalar position, was found. 5S FISH signals of almost the same size and brightness intensity were observed in all the analyzed taxa. This is the first cytological characterization of the 5S in wild taxa of Capsicum by using a genus-derived probe, and the most exhaustive and comprehensive in the chili peppers up to now. The information provided here will aid the cytomolecular characterization of pepper germplasm to evaluate variability and can be instrumental to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wild and cultivated Capsicum; 5S rRNA gene; Capsicum-derived probe; FISH-mapping.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100117

Shrimp and conventional U-Pb age, Sm-Nd isotopic characteristics and tectonic significance of the K-rich Itapuranga suite in Goiás, Central Brazil
Provedor de dados: 42
Autores: PIMENTEL,MÁRCIO M.; DANTAS,ELTON L.; FUCK,REINHARDT A.; ARMSTRONG,RICHARD A.
The Itapuranga alkali granite and Uruana quartz syenite are large K-rich EW-elongated intrusions, in the central part of the Neoproterozoic Brasília Belt, central Brazil. They are associated with Pireneus lineaments, which cut the regional NNW-SSE structures of the southern part of the belt. SHRIMP and conventional U-Pb data for the Itapuranga and Uruana intrusions indicate crystallization ages of 624 ± 10 Ma and 618 ± 4 Ma, respectively. Three zircon cores from the Itapuranga granite yielded U-Pb ages between 1.79 and 1.49 Ga. Sm-Nd T DM ages for both intrusions are 1.44 Ga and epsilonNd(T) values are -5.1 and -5.7, suggesting the input of material derived from older (Paleo- to Mesoproterozoic) sialic crust in the origin of the parental magmas. Magma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brasília Belt; Brasiliano; Itapuranga; Uruana; U-Pb SHRIMP; Pirineus Syntaxis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100011

Inositol metabolism in Trypanosoma cruzi: potential target for chemotherapy against Chagas' disease
Provedor de dados: 42
Autores: OLIVEIRA,MECIA M.; EINICKER-LAMAS,MARCELO.
Chagas' disease is a debilitating and often fatal disease caused by the protozoan parasite Trypanosoma cruzi. The great majority of surface molecules in trypanosomes are either inositol-containing phospholipids or glycoproteins that are anchored into the plasma membrane by glycosylphosphatidylinositol anchors. The polyalcohol myo-inositol is the precursor for the biosynthesis of these molecules. In this brief review, recent findings on some aspects of the molecular and cellular fate of inositol in T. cruzi life cycle are discussed and identified some points that could be targets for the development of parasite-specific therapeutic agents.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inositol; Trypanosoma cruzi; Chagas' disease; Chemotherapy.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300015

Morphometric variation in pink shrimp populations at Rio de Janeiro coast (SE Brazil): are they really similar in closer areas?
Provedor de dados: 42
Autores: CARVALHO,CÁSSIA DE; KEUNECKE,KARINA A.; LAVRADO,HELENA P.
Abstract:Farfantepenaeus brasiliensis and F. paulensis are the most exploited shrimps of SE-S Brazilian coast. Our aim was to verify if adjacent nursery areas with different environmental condition (Sepetiba and Guanabara bays, SE Brazil) influence on shrimp populations (eg, CPUE) and body shapes. Samplings were carried out during 12 months in those bays ca. 85 Km far from each other. Carapace length (CL), total body length (TL), wet weight, abdomen size and TL/CL ratio were used to analyze variations in shape through regressions. In general, F. brasiliensis was 4 to 6 times more abundant than F. paulensis. The sex ratio differed from 1:1 in F. brasiliensis in both bays, with dominance of females, largest catches occur in autumn. However, differences in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Farfantepenaeus brasiliensis; Farfantepenaeus paulensis; Guanabara Bay; Morphometry; Pink shrimps; Sepetiba Bay.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300601

Morphological characteristics of the digestive tract of Schizodon knerii (Steindachner, 1875), (Characiformes: Anostomidae): An anatomical, histological and histochemical study
Provedor de dados: 42
Autores: Santos,Marcella L. Dos; Arantes,Fábio P.; Santiago,Kleber B.; Santos,José E. Dos.
The digestive tracts of 44 specimens of Schizodon knerii were studied using anatomical, histological and histochemical techniques. The mouth has terminal position, the lip epithelium is squamous stratified with mucous, claviform cells and taste buds, teeth have an incisive form and the tongue has a stratified squamous epithelium with mucous cells and taste buds. The oropharynx cavity is formed by gill apparatus and pharyngeal teeth. The oesophagus presented pleated mucosa, a stratified squamous epithelium with mucous cells, oesophageal glands and taste buds. The stomach presented cardiac, fundic and pyloric regions, simple prismatic epithelium with tubular glands, with none in the pyloric region. The intestine contains 11-15 pyloric caeca, a simple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anostomidae; Digestive tract; Fish; Morphology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200867

Urease activity according to the different inhibitors
Provedor de dados: 42
Autores: GOMES,MATEUS P.; ZONTA,EVERALDO; STAFANATO,JULIANO B.; PEREIRA,ARIANA M.
Abstract The objective of this study was to evaluate NBPT, zeolite and humic acid in different concentrations as inhibitors of the activity of the enzyme urease. The activity of the urease enzyme was quantified by the methods proposed by May and Douglas (1976) and Witte and Medina-Escobar (2001). For this reason, two experiments were conducted in a completely randomized design in split plots, in which the incubation periods are the plots and the fertilizers with the inhibitors at the different concentrations are the subplots with three replications. Fifteen fertilizers based on NBPT-coated urea, humic acid and zeolite were used in different concentrations. The two methods of analysis used in the experiment confirmed the efficiency of NBPT in inhibiting the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic acid; Nbpt; Zeolite; Urea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703685

The low academic profile of Brazilian economists
Provedor de dados: 42
Autores: Meneghini,Rogerio.
The worldwide prestige of economists in the lay media lies significantly higher than scientists and academics from other fields of expertise. Brazil is not an exception as well. A point that calls attention to this fact is that the most prestigious international economists, who are frequently present in the lay media, are also distinguished in the academic environment. The lay prestige may be measured by their presence in the media and by surveys of public opinion, whereas academic prestige may be evaluated using database indicators of publications and citations of academic articles. One indicator that became frequently used is the h-index, measuring publications and citations simultaneously. A relevant finding regarding international economists is that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scientific assessment; H-index; Brazilian economists; Academic prestige; Lay prestige.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100431

Radiation dose determines the method for quantification of DNA double strand breaks
Provedor de dados: 42
Autores: BULAT,TANJA; KETA,OTILIJA; KORIĆANAC,LELA; ŽAKULA,JELENA; PETROVIĆ,IVAN; RISTIĆ-FIRA,ALEKSANDRA; TODOROVIĆ,DANIJELA.
ABSTRACT Ionizing radiation induces DNA double strand breaks (DSBs) that trigger phosphorylation of the histone protein H2AX (γH2AX). Immunofluorescent staining visualizes formation of γH2AX foci, allowing their quantification. This method, as opposed to Western blot assay and Flow cytometry, provides more accurate analysis, by showing exact position and intensity of fluorescent signal in each single cell. In practice there are problems in quantification of γH2AX. This paper is based on two issues: the determination of which technique should be applied concerning the radiation dose, and how to analyze fluorescent microscopy images obtained by different microscopes. HTB140 melanoma cells were exposed to γ-rays, in the dose range from 1 to 16 Gy. Radiation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ApoTome software; AxioImagerA1 microscope; Immunofluorescence microscopy; Western blot; ΓH2AX.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100127

Chironomidae (Insecta: Diptera) of different habitats and microhabitats of the Vacacaí-Mirim River microbasin, Southern Brazil
Provedor de dados: 42
Autores: KÖNIG,RODRIGO; SANTOS,SANDRO.
The Chironomidae family is one of the main groups of aquatic insects present in streams. This work aimed to investigate the influences of anthropogenic pressures and substrate types on chironomid community composition and structure. Chironomid larvae were collected during the summer of 2007 at four sites along the Vacacaí-Mirim River microbasin, chosen based on the different available benthic substrates. The organisms were identified in the laboratory at the genus level, and the density, the rarefied taxonomic richness and the Shannon diversity index were calculated. The faunal structure was subjected to an ANOVA to compare the metrics among sites and substrates. The community composition of the sites was subjected to a multivariate statistical analysis....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insects; Benthic substrates; Anthropogenic pressures; Faunal structure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300975

First Ediacaran Fauna Occurrence in Northeastern Brazil (Jaibaras Basin, ?Ediacaran-Cambrian): Preliminary Results and Regional Correlation
Provedor de dados: 42
Autores: BARROSO,FRANCISCO R.G.; VIANA,MARIA SOMÁLIA S.; LIMA FILHO,MARIO F. DE; AGOSTINHO,SONIA M.O.
This study reports the first known occurrence of the Ediacaran fauna in northeastern Brazil (at Pacujá Municipality, northwestern state of Ceará) and presents preliminary interpretations of its significance. Regional correlation indicates that the fossils originated in the Jaibaras Basin and that they may represent a new geological system. The depositional environment can be attributed to a fluviomarine system. Nine Ediacaran species can be identified, including members of pandemic groups (e.g., Charniodiscus arboreus Glaessner, 1959; ?Charniodiscus concentricus Ford, 1958; Cyclomedusa davidi Sprigg, 1947; Ediacaria flindersi Sprigg, 1947; and Medusinites asteroides Sprigg, 1949) and endemic groups (e.g., Kimberella quadrata Glaessner &amp; Wade, 1966;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; State of Ceará; Ediacaran fauna; Fluviomarine environment; White Sea Assemblage.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301029

Myenteric neuronal plasticity induced by Toxoplasma gondii (genotype III) on the duodenum of rats
Provedor de dados: 42
Autores: Papazian-Cabanas,Rodrigo M.; Araújo,Eduardo J.A.; Silva,Aristeu V. da; Sant'Ana,Débora M.G.
The effects of acute and chronic infection caused by Toxoplasma gondii on duodenal myenteric neurons were analyzed. Eighteen rats were assigned into four groups: Acute Control Group (ACG, n=4); Acute Experimental Group (AEG, n=4); Chronic Control Group (CCG, n=5); and Chronic Experimental Group (CEG, n=5). Rats from the AEG and CEG were inoculated orally with 105 genotype III (BTU-II strain) tachyzoites of T. gondii isolated from a dog with neurological signs. Acute groups were killed after 24 hours after the inoculation and the chronic groups after 30 days. Whole-mount from the duodenum were stained with Giemsa. The population density of myenteric neurons, as well the body cell, nuclear and cytoplasmic area were analyzed. Both acute and chronic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enteric nervous system; Infection; Parasite; Toxoplasmosis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300016

The occurrence of microdiamonds in Mesoproterozoic Chapada Diamantina intrusive rocks: Bahia / Brazil
Provedor de dados: 42
Autores: Battilani,Gislaine A.; Gomes,Newton S.; Guerra,Wilson J.
The origin of diamonds from Serra do Espinhaço in Diamantina region (State of Minas Gerais) and in Chapada Diamantina, Lençóis region (State of Bahia) remains uncertain, even taking into account the ample research carried out during the last decades. The lack of typical satellite minerals in both districts makes a kimberlitic source for these diamonds uncertain. In mid 18th century the occurrence of a metamorphosed igneous rock composed of martite, sericite and tourmaline was described in Diamantina region and named hematitic phyllite, considered by some researchers as a possible diamond source. Similar rocks were found in Lençóis and examined petrographically and their heavy mineral concentration was investigated by means of scanning electron microscopy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microdiamonds; Intrusive rocks; Tombador Formation; Serra do Espinhaço; Mesoproterozoic; Chapada Diamantina.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200013

Magnetic Parkia pendula seed gum as matrix for Concanavalin A lectin immobilization and its application in affinity purification
Provedor de dados: 42
Autores: RÊGO,MOACYR J.B.M.; ALMEIDA,SINARA M.; BEZERRA,SÉRGIO A.; CARVALHO JÚNIOR,LUIZ B.; BELTRÃO,EDUARDO I.C.
The present work aimed to magnetize Parkia pendula seeds gum and use it as a matrix for Concanavalin A covalent immobilization. This composite was applied in affinity purification of glycoconjugates. Parkia pendula seeds were hydrated and the gum provenient from the supernatant was precipitated and washed with ethanol and dried. The gum was magnetized in co-precipitation using solutions of Fe+2 and Fe+3. Matrix activation was accomplished with NaIO4. Magnetized Parkia pendula seeds gum with covalently immobilized Concanavalin A was used as an affinity matrix for the recognition of bovine serum fetuin glycoprotein. Fetuin elution was carried out with a solution of glucose (300mM) and evaluated through SDS-PAGE. The efficiency of lectin immobilization and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Immobilization; Magnetization; Parkia pendula seed gum; Concanavalin A.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301351

The Gauss Map of Complete Minimal Surfaces with Finite Total Curvature
Provedor de dados: 42
Autores: HINOJOSA,PEDRO A.; SILVA,GILVANEIDE N.
In this paper we are concerned with the image of the normal Gauss map of a minimal surface immersed in ℝ3 with finite total curvature. We give a different proof of the following theorem of R. Osserman:The normal Gauss map of a minimal surface immersed inℝ3with finite total curvature, which is not a plane, omits at most three points of&amp;#55349;&amp;#56650;2Moreover, under an additional hypothesis on the type of ends, we prove that this number is exactly 2.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gauss map; Minimal surfaces; Finite total curvature; Image of the Gauss map.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401217

Reproductive phenology of the American Bullfrog in subtropical Brazil: photoperiod as a main determinant of seasonal activity
Provedor de dados: 42
Autores: MEDEIROS,CAMILA I.; BOTH,CAMILA; KAEFER,IGOR L.; CECHIN,SONIA Z.
ABSTRACT The North American bullfrog Lithobates catesbeianus continues to invade ecosystems worldwide, potentially causing population declines and even extinctions. Within its native distribution, bullfrogs show prolonged reproductive seasons and high fertility. However, data on breeding biology of bullfrogs ex-situ in invaded localities mainly comes from anecdotal reports. Understanding how invasive species are adjusting their life histories to new colonized environments is important for conservation purposes. Here we describe temporal and spatial abundance, calling activity, spawning and tadpole distribution of bullfrogs in southern Brazil. Eighteen samplings occurred during one year. The abundance of individuals was positively related to longer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding; Invasive species; Lithobates catesbeianus; Microhabitat; Recruitment; Spatial distribution.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501909

Growth of the tropical zoanthid Palythoa caribaeorum (Cnidaria: Anthozoa) on reefs in northeastern Brazil
Provedor de dados: 42
Autores: SILVA,JANINE F.; GOMES,PAULA B.; SANTANA,ERIKA C.; SILVA,JOÃO M.; LIMA,ÉRICA P.; SANTOS,ANDRE M.M.; PÉREZ,CARLOS D.
In Brazilian reefs, zoanthids, especially Palythoa caribaeorum are fundamental for structuring the local benthic community. The objective of this study was to determine the growth rate of P. caribaeorum, and to assess the influence of the site (different beaches), season (dry and wet), location (intertidal or infralittoral zones), and human pressure associated with tourism. For one year we monitored the cover of P. caribaeorum in transects and focused on 20 colonies. We cut off a square (100 cm2) from the central part of the colony and monitored the bare area for four months in each season. The average growth rates varied from 0.015 and 0.021 cm.day-1. The rate was homogeneous in all localities, and there was no influence from colony site, location, or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth rate; Trampling; Tropical reefs; Zoantharia.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200985

New triterpene isolated from Eschweilera longipes (Lecythidaceae)
Provedor de dados: 42
The phytochemical studies of Eschweilera longipes Miers (Lecythidaceae) have led to the identification of a new triterpene 3beta, 24-dihydroxyfriedelane, the known 1beta, 2beta, 3beta, 19beta-tetrahydroxyurs-12-en-28-oic acid (1beta-hydroxyeucaphic acid) besides the saponin sitosterol 3betaO-betaD-glucopyranoside. The structures were established from the IR, NMR and mass spectra data including 2D NMR experiments of natural substances and of the acetyl derivative of the new triterpene.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eschweilera longipes; Lecythidaceae; Triterpenoids.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100003

Potential effects of fungicide and algaecide extracts of Annona glabra L. (Annonaceae) on the microalgae Raphidocelis subcapitata and on the oomycete Pythium
Provedor de dados: 42
Autores: ROCHA,GISELI S.; MATSUMOTO,REGINALDO S.; LOMBARDI,ANA TERESA; LIMA,MARIA INÊS S.
ABSTRACT Annona glabra L. is a semi-deciduous tree that contains several active substances, including secondary metabolites, with antifungal activity. Phytopathogenic strains of the genus Pythium cause billion dollar losses all over the world on natural and crop species. Searching for eco-friendly algaecides and fungicides, we analyzed the effects of acetone extracts of A. glabra leaves on the algae Rhaphidocelis subcapitata (Korshikov) and on the oomycete Pythium aphanidermatum (Edson). We evaluated ten extract concentrations for each organism - 0 to 400 mg L-1 for algae and 0-1000 µg disc1 for oomycete. The results showed no effect on algae up to 75 mg L-1, but a significant inhibitory effect at 125 mg L-1 and above, which reduced the growth rate and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal growth; Allelopathy; Leaf extract; Secondary metabolites.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502101

Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR
Provedor de dados: 42
Autores: Trosdtorf Jr.,Ivo; Assine,Mario L.; Vesely,Fernando F.; Rocha-Campos,Antonio C.; Santos,Paulo R. dos; Tomio,Alexandre.
Striae and furrows found on the upper surfaces of three stratigraphically superposed decimetric beds of late Paleozoic lodgement tillite of the Itararé Subgroup in the northern Paraná Basin were engraved by ploughing of clasts and possibly also ice protuberances at the base of the glacier, on unconsolidated to partially consolidated sediment. Associated features indicate that the rheology of the bed varied from stiff during lodgement to soft and deformable during ploughing. Poor drainage of meltwater at the glacier-bed interface may have contributed to lower the strength of sediment to deformation. The deformed interval was probably generated during a single glacial phase or advance of a glacier grounding in a marine or lacustrine water body. Changes in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glacially striated surfaces; Soft sediments; Itararé Subgroup; Late Paleozoic.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200013

Swimming exercise changed the collagen synthesis and calcification in calcaneal tendons of mice
Provedor de dados: 42
Autores: CARVALHO,ANGELA A. M.; MOURA,FRANCYELLE B. R. DE; NOGUEIRA,PEDRO AUGUSTO S.; GONÇALVES,ALINE MARIA N.; ARAÚJO,FERNANDA A.; ZANON,RENATA G.; TOMIOSSO,TATIANA CARLA.
Abstract  Obesity is characterized by the excess of body fat and, therefore, may cause musculoskeletal alterations that can negatively influence the tendons. Such overweight-influenced alterations are exercise sensitive though. Morphological and biochemical alterations were reported in the calcaneal tendon of mice submitted to a lipid-rich diets along with practicing exercises, with the following groups: normal diet without exercise (ND), normal diet with exercise (NDex), lipid-rich diet without exercise (LD), lipid-rich diet without exercise (LDex). The calcaneal tendons were removed and subjected to histological and biochemical analysis. Layers of the tissue were stained with Hematoxylin and Eosin, Picrosirius Red and Von Kossa while a protein dosage was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Hematoxylin-eosin; Obesity; Tendon; Von Kossa.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100909

Geomorphology-based unit hydrograph models for flood risk management: case study in Brazilian watersheds with contrasting physiographic characteristics
Provedor de dados: 42
Autores: BESKOW,SAMUEL; NUNES,GABRIELA S.; MELLO,CARLOS R. DE; CALDEIRA,TAMARA L.; NORTON,LLOYD D.; STEINMETZ,ALICE A.; VARGAS,MARCELLE M.; ÁVILA,LÉO F.
ABSTRACT Heavy rainfall in conjunction with an increase in population and intensification of agricultural activities have resulted in countless problems related to flooding in watersheds. Among the techniques available for direct surface runoff (DSR) modeling and flood risk management are the Unit Hydrograph (UH) and Instantaneous Unit Hydrograph (IUH). This study focuses on the evaluation of predictive capability of two conceptual IUH models (Nash and Clark), considering their original (NIUH and CIUH) and geomorphological approaches (NIUHGEO and CIUHGEO), and their advantages over two traditional synthetics UH models - Triangular (TUH) and Dimensionless (DUH), to estimate DSR hydrographs taking as reference two Brazilian watersheds with contrasting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clark’s IUH; Nash’s IUH; Direct surface runoff; Hydrograph; Geomorphological approach.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401873

Synthesis, characterization and antimicrobial activity of Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands against bacteria and yeasts of clinical importance
Provedor de dados: 42
Autores: HERRERA,KARINA M.S.; FERREIRA,LORENA S.; BRAGA,ALYSSON V.; SOUZA,JULIANO P.; ANDRADE,JÉSSICA T.; SOARES,ADRIANA C.; SOARES,LUIS F.; CHAGAS,RAFAEL C.R.; FERREIRA,JAQUELINE M.S.
Abstract: Four novel Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands were synthesized and characterized using elemental, physiochemical, and spectroscopy analytical methods. The results showed the formation of ligands coordinated by sulfur atoms of the C = S bond to the L1 ligand and by the sulfur atom of the C-S bond and/or nitrogen of the intra C-ring bond of the L2 ligand. The activity of the complexes against Gram-negative, Gram-positive bacteria and yeasts of clinical importance was evaluated by broth microdilution method. The best result was obtained to L2-Ni compound against E. cloacae (Minimal Inhibitory Concentration (MIC) = 62.5 µg/mL). Additionally, the compounds showed anti-Candida activity (MIC values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 1; 2-bis-bis (2-thiazolin-2-isulfanyl) ethane antimicrobial activity hidrotris (2-mercaptothiazolyl) borate complexes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700803

Vaccines based on the cell surface carbohydrates of pathogenic bacteria
Provedor de dados: 42
Autores: Jones,Christopher.
Glycoconjugate vaccines, in which a cell surface carbohydrate from a micro-organism is covalently attached to an appropriate carrier protein are proving to be the most effective means to generate protective immune responses to prevent a wide range of diseases. The technology appears to be generic and applicable to a wide range of pathogens, as long as antibodies against surface carbohydrates help protect against infection. Three such vaccines, against Haemophilus influenzae type b, Neisseria meningitidis Group C and seven serotypes of Streptococcus pneumoniae, have already been licensed and many others are in development. This article discusses the rationale for the development and use of glycoconjugate vaccines, the mechanisms by which they elicit T...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycoconjugate Vaccines; Capsular polysaccharides; Lipopolysaccharides.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200009

Particle Fluxes and Bulk Geochemical Characterization of the Cabo Frio Upwelling System in Southeastern Brazil: Sediment Trap Experiments between Spring 2010 and Summer 2012
Provedor de dados: 42
Autores: ALBUQUERQUE,ANA LUIZA S.; BELÉM,ANDRÉ L.; ZULUAGA,FRANCISCO J.B.; CORDEIRO,LIVIA G.M.; MENDOZA,URSULA; KNOPPERS,BASTIAAN A.; GURGEL,MARCIO H.C.; MEYERS,PHILIP A.; CAPILLA,RAMSÉS.
Physical and biogeochemical processes in continental shelves act synergistically in both transporting and transforming suspended material, and ocean dynamics control the dispersion of particles by the coastal zone and their subsequent mixing and dilution within the shelf area constrained by oceanic boundary currents, followed by their gradual settling in a complex sedimentary scenario. One of these regions is the Cabo Frio Upwelling System located in a significantly productive area of Southeastern Brazil, under the control of the nutrient-poor western boundary Brazil Current but also with a wind-driven coastal upwelling zone, inducing cold-water intrusions of South Atlantic Central Water on the shelf. To understand these synergic interactions among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment traps; Bulk geochemical composition; Cabo Frio Upwelling System; Particle flux; Southeastern Brazilian shelf.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200601

Theoretical approach of the main means of appeals in the European procedural law
Provedor de dados: 42
Autores: Petrescu,Oana M.
Knowledge and understanting the means of appeals lodged before the courts of the European Union, limited only to the points of law, are very important taking into accout the modality to control a judgment delivered by an inferior court exists since ancient times, being governed among others, by the Larin principle: res judicata pro veritate accipitur. In the following we will examine, in general, the judicial control of the judgments and orders delivered by the General Court and by the Civil Service Tribunal, as a specialized tribunal on civil servant issues, but also the sui generis means of appeals and the extraordinary means of reviews of the judgments and orders. We shall mention that all of them are exercised in accordance with the Rules of Procedure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Treaty of Lisbon; European courts; Means of appeals; Sui generis means of appeals; Extraordinary remedies.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502317

S-(+)- and R-(-)-linalool: a comparison of the in vitro anti-Aeromonas hydrophila activity and anesthetic properties in fish
Provedor de dados: 42
Autores: SILVA,LENISE L.; BALCONI,LUANA S.; GRESSLER,LETÍCIA T.; GARLET,QUELEN I.; SUTILI,FERNANDO J.; VARGAS,AGUEDA P. C.; BALDISSEROTTO,BERNARDO; MOREL,ADEMIR F.; HEINZMANN,BERTA M.
ABSTRACT Linalool is the main compound of many essential oils and occurs in two isomeric forms: S-(+)- and R-(-)-linalool. This study aimed to determine if linalool isomers have different antimicrobial and anesthetic properties in fish. For this purpose, these compounds were previously isolated from Lippia alba (Mill.)N. E. Brown and Ocimum americanum L. essential oils. Antimicrobial effects were evaluated through the microdilution test against Aeromonas hydrophila, an important fish disease etiologic agent. Induction time until sedation, anesthesia and recovery time were determined in silver catfish (Rhamdia quelen) through bath exposure (60, 180, 300 or 500 μL L-1). The results showed different biological properties for the isomers being S-(+)-linalool...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthesia; Aeromonas hydrophila; Chirality; Linalool; Silver catfish.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100203

Statistical tools application on dextranase production from Pochonia chlamydosporia (VC4) and its application on dextran removal from sugarcane juice
Provedor de dados: 42
Autores: SUFIATE,BRUNA L.; SOARES,FILIPPE E.F.; GOUVEIA,ANGÉLICA S.; MOREIRA,SAMARA S.; CARDOSO,EVANDRO F.; TAVARES,GABRIELLA P.; BRAGA,FABIO R.; ARAÚJO,JACKSON V. DE; QUEIROZ,JOSÉ H. DE.
ABSTRACT The aim of this study was to optimize the dextranase production by fungus Pochonia chlamydosporia (VC4) and evaluate its activity in dextran reduction in sugarcane juice. The effects, over the P. chlamydosporia dextranase production, of different components from the culture medium were analyzed by Plackett-Burman design and central composite design. The response surface was utilized to determine the levels that, among the variables that influence dextranase production, provide higher production of these enzymes. The enzymatic effect on the removal of dextran present in sugarcane juice was also evaluated. It was observed that only NaNO3 and pH showed significant effect (p&lt;0.05) over dextranase production and was determined that the levels which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane juice; Dextranase; Pochonia chlamydosporia; Plackett-Burman; Response surface.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100461

Density, abundance and extractive potential of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae): subsidies for fishery management
Provedor de dados: 42
Autores: PINHEIRO,MARCELO A.A.; SOUZA,MARCELO R.; SANTOS,LUCIANA C.M.; FONTES,ROBERTO F.C.
ABSTRACT Ucides cordatus is a relevant fishery resource of Brazilian mangroves and requires legal normative to sustainable use based on stock assessment and management. This study evaluated some population parameters (structure, density, abundance, fishery potential and stock) of this crab species in Brazil Southeast (São Paulo, State), discussing the use of the results to delineate fishery management strategies. Density was monthly evaluated (September 1998 to August 1999), using five sample quadrats of 2x2 m. Density (ind.m-2) was indirectly estimated by counting the opened (with biogenic activity) and closed galleries, and contrasted with flooding level by tides using the vertical distribution of macroalgae in the base of trees. Density of U. cordatus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crab; Crustacean; Fishery; Management; Mangrove; Population.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401381

Animal performance and carcass characteristics from confined lambs fed on concentrate feed and additives
Provedor de dados: 42
Autores: Prado,Tayrone F.; França,Aldi F.S.; Meirinhos,Maria Lúcia G.; Peron,Hugo J.M.C.; Ferreira,Reginaldo N.; Oliveira,Leonardo G.; Corrêa,Daniel S.
ABSTRACT  The number of sheep flocks in Brazil is increasing. It is known that lambs must be slaughtered when young for producing quality meat. The current study evaluated the inclusion of protected methionine, protected lysine, lysophospholipid and amylolytic enzymes in a diet to lambs and their effects on weight gain and quantitative carcass traits at slaughtering. Eighty non-castrated male crossbred Dorper x Santa Inês lambs, 20.57 ± 4.33 kg live weight, were used. The feedlot lasted 64 days and 60 animals were slaughtered. There were no differences for live weight, daily feed intake, feed conversion and average daily weight gain at the first 28 days of feedlot. From the 28th day lysophospholipid treatment presented the highest live weight....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylolytic enzyme; Lysine; Lysophospholipid; Methionine; Ovine.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502255

An Update on the Occurrence and Damage Caused to Cashew by Gypona cerea DeLong &amp;amp; Freytag (Hemiptera: Cicadellidae) in Northeastern Brazil
Provedor de dados: 42
Autores: SOUZA,SUYANNE A. DE; DIAS-PINI,NIVIA S.; SERRANO,LUIZ AUGUSTO L.; VIDAL NETO,FRANCISCO C.; MACIEL,GABRIELA PRISCILA S.; SOUSA,VIVIANE R. DE; AZEVEDO FILHO,WILSON S. DE.
Abstract: We have identified specimens of the leafhopper Gypona cerea DeLong &amp; Freytag (Cicadellidae: Iassinae: Gyponini) collected from a crop of dwarf cashew (Anacardium occidentale Linnaeus 1753) located in Canto do Buriti, Piauí, Northeastern Brazil. The damage caused to the crop included inflorescences covered with sticky exudates, presence of sooty mold, and yellowing and drying of new shoots and inflorescences. Such documentation serves as a warning about possible outbreaks of infestation in the region and the likelihood of its expansion to other cashew producing areas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Inflorescence Leafhopper; Insect Pest; New record.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700616

Comparative morpho-anatomical studies of the lesions caused by citrus leprosis virus on sweet orange
Provedor de dados: 42
Autores: Marques,João P.R.; Kitajima,Elliot W.; Freitas-Astúa,Juliana; Appezzato-da-Glória,Beatriz.
The leprosis disease shows a viral etiology and the citrus leprosis virus is considered its etiologic agent. The disease may show two types of cytopatologic symptom caused by two virus: nuclear (CiLV-N) and cytoplasmic (CiLV-C) types. The aim of this study was to compare the morpho-anatomical differences in the lesions caused by leprosis virus-cytoplasmic and nuclear types in Citrus sinensis (L.) Osbeck 'Pêra'. Leaf and fruit lesions were collected in Piracicaba/São Paulo (cytoplasmic type) and Monte Alegre do Sul/São Paulo and Amparo/São Paulo (nuclear type). The lesions were photographed and then fixed in Karnovsky solution, dehydrated in a graded ethylic series, embedded in hydroxy-ethyl methacrylate resin (Leica Historesin), sectioned (5 μm thick),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatoy; Hyperplasy; Hypertrophy; Traumatic gum ducts.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200025

Lead tolerance of water hyacinth (Eichhornia crassipes Mart. - Pontederiaceae) as defined by anatomical and physiological traits
Provedor de dados: 42
Autores: PEREIRA,FABRICIO J.; CASTRO,EVARISTO M. DE; OLIVEIRA,CYNTHIA DE; PIRES,MARINÊS F.; PEREIRA,MARCIO P.; RAMOS,SILVIO J.; FAQUIN,VALDEMAR.
This study aimed at verifying the lead tolerance of water hyacinth and at looking at consequent anatomical and physiological modifications. Water hyacinth plants were grown on nutrient solutions with five different lead concentrations: 0.00, 0.50, 1.00, 2.00 and 4.00 mg L–1 by 20 days. Photosynthesis, transpiration, stomatal conductance and the Ci/Ca rate were measured at the end of 15 days of experiment. At the end of the experiment, the anatomical modifications in the roots and leaves, and the activity of antioxidant system enzymes, were evaluated. Photosynthetic and Ci/Ca rates were both increased under all lead treatments. Leaf anatomy did not exhibit any evidence of toxicity effects, but showed modifications of the stomata and in the thickness of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Ecophysiology; Plant anatomy; Macrophytes.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301423

Human neutrophil alloantigens systems
Provedor de dados: 42
Autores: Moritz,Elyse; Norcia,Ângela M. M. I.; Cardone,José D. B.; Kuwano,Sachie T.; Chiba,Akemi K.; Yamamoto,Mihoko; Bordin,José O.
Neutrophil alloantigens are involved in a variety of clinical conditions including immune neutropenias, transfusion-related acute lung injury (TRALI), refractoriness to granulocyte transfusions and febrile transfusion reactions. In the last decade, considerable progress has been made in the characterization of the implicated antigens. Currently, seven antigens are assigned to five human neutrophil antigen (HNA) systems. The HNA-1a, HNA-1b and HNA-1c antigens have been identified as polymorphic forms of the neutrophil Fcγ receptor IIIb (CD16b), encoded by three alleles. Recently, the primary structure of the HNA-2a antigen was elucidated and the HNA-2a-bearing glycoprotein was identified as a member of the Ly-6/uPAR superfamily, which has been clustered as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutrophil antigens; Blood transfusion; Alloimmunization; Transfusion reaction; Neutropenia.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300019

Soluble amino acid profile, mineral nutrient and carbohydrate content of maize kernels harvested from plants submitted to ascorbic acid seed priming
Provedor de dados: 42
Autores: ALCÂNTARA,BERENICE K.; RIZZI,VANESSA; GAZIOLA,SALETE A.; AZEVEDO,RICARDO A.
ABSTRACT Both the scientific community and society have shown interest in improving the content of amino acids, carbohydrates and mineral nutrients in maize because it represents an important staple food in many developing countries. Earlier studies demonstrated that the treatment of seeds using ascorbic acid (AsA-seed priming) enhanced soluble carbohydrates, proteins and soluble amino acids for other species. AsA seed priming in maize showed the potential for reducing abiotic stresses. The effects on grain quality have not been previously demonstrated. This study investigated the impacts of AsA seed priming on maize kernel quality of seeds produced by the plants generated from the primed seeds, based on the amino acid profile and carbohydrate and mineral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitamin C; Grain quality; Boron; Sugar; Amino acids.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200695

The combination of compost or biochar with urea and NBPT can improve nitrogen-use efficiency in maize
Provedor de dados: 42
Autores: COELHO,MICHELLE A.; FUSCONI,ROBERTA; PINHEIRO,LILIANE; RAMOS,IONARA C.; FERREIRA,ADÃO S.
ABSTRACT The addition of organic residues to agricultural soils has been used as a practical alternative to improve crop quality and health. The objective of this work was to evaluate maize physiological and nutritional responses to the application of compost and biochar combined with urea (N) and N-(n-butyl) thiophosphoric triamide (NBPT). The experiment was performed in plastic pots with 3 kg of soil under greenhouse conditions for 30 days. The compost and biochar were applied at the rate of 0.3 ton ha-1, using an amount of nutrient (nitrogen, phosphorus and potassium) demanded by crop growth. The physiological responses of maize were monitored by measuring the plant height, stalk diameter, leaf chlorophyll content, shoot dry weight and root dry weight....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composting; Pyrolysis; Nitrogen uptake; N-(n-butyl) thiophosphoric triamide; Nutrient assimilation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401695

Robust volumetric models for supporting the management of secondary forest stands in the Southern Brazilian Atlantic Forest
Provedor de dados: 42
Autores: OLIVEIRA,LAIO Z.; KLITZKE,ALINE R.; FANTINI,ALFREDO C.; ULLER,HEITOR F.; CORREIA,JEAN; VIBRANS,ALEXANDER C.
Abstract The majority of Atlantic Forest fragments in Southern Brazil are second-growth forests dominated by fast-growing species with considerable market-value timber. Nevertheless, volume prediction models are scarce, especially to estimate tree total volume (i.e., stem plus branches). This study approached the issue through the following aims: to fit and select stem and total volume models (generic and species-specific) using data from 288 harvested trees in a management operation, and to fit generic and species-specific bark factors. The power model embedding diameter at breast height (D) and tree stem or total height (H) presented the greatest prediction strength for both stem and total tree volume. Models including only D to predict total tree volume...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest inventory; Mata Atlântica; Modelling; Regression.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703729

Uncertainties Associated with Arithmetic Map Operations in GIS
Provedor de dados: 42
Autores: YAMAMOTO,JORGE K.; KIKUDA,ANTÔNIO T.; RAMPAZZO,GUILHERME J.; LEITE,CLAUDIO B.B.
Abstract Arithmetic map operations are very common procedures used in GIS to combine raster maps resulting in a new and improved raster map. It is essential that this new map be accompanied by an assessment of uncertainty. This paper shows how we can calculate the uncertainty of the resulting map after performing some arithmetic operation. Actually, the propagation of uncertainty depends on a reliable measurement of the local accuracy and local covariance, as well. In this sense, the use of the interpolation variance is proposed because it takes into account both data configuration and data values. Taylor series expansion is used to derive the mean and variance of the function defined by an arithmetic operation. We show exact results for means and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; Interpolation variance; Map Algebra; Propagation of Uncertainty; Taylor series.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502025

A relation between the right triangle and circular tori with constant mean curvature in the unit 3-sphere
Provedor de dados: 42
Autores: Barros,Abdênago.
In this note we will show that the inverse image under the stereographic projection of a circular torus of revolution in the 3-dimensional euclidean space has constant mean curvature in the unit 3-sphere if and only if their radii are the catet and the hypotenuse of an appropriate right triangle.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flat torus; Constant mean curvature; Circular tori; Stereographic projection.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400002

Decreased inflammatory response in rat bladder after intravesical administration of capsaicin-loaded liposomes
Provedor de dados: 42
Autores: CIRINO,LORENA M.D.; VERGNE,DAVIANE M.C.; SANTANA,PATRÍCIA F.; ALMEIDA,ENRIK DE; COSTA,LUIZ P. DA; ALBUQUERQUE-JÚNIOR,RICARDO L.C. DE; LIMA-VERDE,ISABEL B.; PADILHA,FRANCINE F.; CARDOSO,JULIANA C.
ABSTRACT The objective of this work was to study the reduction in the capsaicin toxicity by encapsulation in liposomes. Capsaicin was extracted from peppers and characterized with high performance liquid chromatography (HPLC). We determined the zeta potential, polydispersivity index (PdI) and vesicle size of liposomes. Wistar rats were submitted to intravesical instillation of liposomes (LIP), capsaicin (CAP) or liposomes with capsaicin (CAPLIP). After 24 hours, bladders were removed for histological analysis. Vesicle size ranged from 68 to 105 nm with PdI smaller than 0.2 and zeta potential around -30 mV. The vesicles maintained stability over the 14-day study. The histological analysis of the CAP group showed intense inflammation in almost all bladder...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsaicin; Liposomes; Urinary incontinence; Intravesical administration.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401539

Relationships of †Codoichthys carnavalii Santos, 1994 (Teleostei, Clupeomorpha, †Ellimmichthyiformes) from the Late Aptian of São Luís-Grajaú Basin, NE Brazil
Provedor de dados: 42
Autores: FIGUEIREDO,FRANCISCO J. DE; RIBEIRO,DOUGLAS R.M.
ABSTRACT †Codoichthys carnavalii is a clupeomorph fish only found in calcareous concretions of Codó Formation, State of Maranhão. It is known based on three specimens housed in the paleontological collection of the Museu de Ciências da Terra of Departamento Nacional da Produção Mineral, Rio de Janeiro. It was omitted in most of recent cladistic analyses about clupeomorphs. We revisited its anatomy furnishing new data and additional restorations. Furthermore we explored the relationships of †Codoichthys with the computer program TNT based on a matrix with 30 taxa and 60 unordered and unweight characters. Elops was used to root the tree. The strict consensus was obtained from three shortest trees (L=181; CI=0.387; RI=0.632). The monophyly of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: †Codoichthys; São Luis-Grajaú Basin; Lower Cretaceous; Systematics; Northeastern Brazil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401277

Effect of essential oil from Citrus aurantium in maternal reproductive outcome and fetal anomaly frequency in rats
Provedor de dados: 42
Autores: Volpato,Gustavo T.; Francia-Farje,Luis A.D.; Damasceno,Débora C.; Oliveira,Renata V.; Hiruma-Lima,Clélia A.; Kempinas,Wilma G.
Citrus aurantium L., commonly known as bitter orange, is widely used in folk medicine, but there is little data in the literature about the effects on pregnancy. The aim of the present study was to evaluate the influence of essential oil obtained from fruits of Citrus aurantium on the maternal reproductive outcome and fetal anomaly incidence in rats. Pregnant Wistar rats were randomized into four groups (n minimum = 12 animals/group): G1 = control, G2 to G4 = treated with essential oil from C. aurantium at dose 125, 250 and 500 mg/kg, respectively. Rats were orally treated, by gavage, with plant essential oil or vehicle during pre-implantation and organogenic period (gestational day 0-14). On gestational day 20 the rats were anaesthetized and the gravid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus aurantium; Essential oil; Limonene; Malformation; Pregnancy; Reproductive outcome.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100407

The Query of Suitable Areas for plantation and development of Taxus baccata L Species by Using GIS in Northern Iran
Provedor de dados: 42
Autores: ALAMI,ANOSHIRVAN; ESLAMI,ALIREZA; HASHEMI,SEYED A.
Taxus baccata is a native species to the Caspian forests and is considered as the identification of these forests by some resources. The aim of this study was to understand the ecological characteristics of T. baccata in order to find suitable areas for its plantation in the Pone Aram preserve of Golestan province. Therefore, Multi-Criteria Evaluation (MCE) methods based on Analytical Hierarchy Process (AHP) were used. In this process at first the needed and effective natural indexes were used as 10 parameters. Then the final map of suitable areas for T. baccata plantation were produced based on Bolian and MCE models. According to the results, in Bolian method about 6218 ha of the total area of the study site (30554 ha) were estimated as suitable and semi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxus baccata; Locating; MCE; Bolian; Pone Aram; Iran.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301497

Flavonoids of Lonchocarpus montanus A.M.G. Azevedo and biological activity
Provedor de dados: 42
Autores: Magalhães,Aderbal F.; Tozzi,Ana Maria G.A.; Magalhães,Eva G.; Sannomiya,Miriam; Soriano,Maria del Pilar C.; Perez,Mary A.F.
The analysis of root extracts from Lonchocarpus montanus A.M.G. Azevedo resulted in the isolation of twenty three compounds chiefly flavonoids of which five (four flavonoids and one benzophenone) are described for the first time. The molecular structures of the new compounds (1-5) were determined through spectral analysis (UV, IR, MS and NMR) as being: 2'-hydroxy-8-(&lt;FONT FACE=Symbol&gt;a,a&lt;/FONT&gt;-dimethylallyl)-2", 2"-dimethylpyrano-(5",6":3',4')-dibenzoylmethane (1), 2'-methoxy-8-(&lt;FONT FACE=Symbol&gt;a, a&lt;/FONT&gt;-dimethylallyl)-2", 2"-dimethylpyrano-(5",6":3',4')-dibenzoylmethane (2), 4'-methoxy-2",2"-dimethylpyrano-(5",6":8,7)-flavone (3), 2"-(1-hydroxy-1-methylethyl)-furano-(4",5":8,7)-flavone (4) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lonchocarpus montanus A.M.G. Azevedo; Leguminosae; Dibenzoylmethanes; Flavonoids; Flavones; Benzophenone; Bioautography; Artemia salina lethality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300001

A decoding method of an n length binary BCH code through (n + 1)n length binary cyclic code
Provedor de dados: 42
Autores: SHAH,TARIQ; KHAN,MUBASHAR; ANDRADE,ANTONIO A. DE.
For a given binary BCH code Cn of length n = 2s - 1 generated by a polynomial  of degree r there is no binary BCH code of length (n + 1)n generated by a generalized polynomial  of degree 2r. However, it does exist a binary cyclic code C(n+1)n of length (n + 1)n such that the binary BCH code Cn is embedded in C(n+1)n. Accordingly a high code rate is attained through a binary cyclic code C(n+1)n for a binary BCH code Cn. Furthermore, an algorithm proposed facilitates in a decoding of a binary BCH code Cn through the decoding of a binary cyclic code C(n+1)n, while the codes Cn and C(n+1)n have the same minimum hamming distance.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BCH code; Binary cyclic code; Binary Hamming code; Decoding algorithm.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300863

Evaluating the quality of the Digital Elevation Models produced from ASTER stereoscopy for topographic mapping in the Brazilian Amazon Region
Provedor de dados: 42
Autores: Oliveira,Cleber G. de; Paradella,Waldir R.
Brazilian Amazon is a vast territory rich in natural renewable and non-renewable resources. Due to the adverse environmental condition (rain, cloud, dense vegetation) and difficult access, topographic information is still poor, and when available needs to be up-dated or remapped. In this paper, the feasibility of using elevation generated from orbital ASTER- stereo-pairs images for topographic mapping was investigated for the mountainous relief in the Serra dos Carajás, Pará. The quality of information derived from these optical images was evaluated regarding field altimetric measurements. Precise topographic field information acquired from Global Positioning System (GPS) was used as Ground Control Points (GCPs) for the modeling of the stereoscopic Digital...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Topographic mapping; DEM; ASTER; Stereoscopy; Amazon Region.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200008

Saturniid moths (Lepidoptera: Bombycoidea) from an Atlantic Rain Forest fragment in southeastern Brazil
Provedor de dados: 42
Autores: ALBERTONI,FABIANO F.; MIELKE,CARLOS G.C.; DUARTE,MARCELO.
Abstract The light-attracted silk moths (Lepidoptera: Saturniidae) of the Boraceia Biological Station in the municipality of Salesópolis, state of São Paulo, southeastern Brazil have been sampled over more than seven decades (1942-2013). A total of 6,288 individuals (including a gynandromorph) belonging to five subfamilies, 46 genera and 133 species were identified. Hemileucinae was the most abundant and speciesrich subfamily, followed by Ceratocampinae, Arsenurinae, Saturniinae, and Oxyteninae. Hylesia Hübner, Automeris Hübner, and Dirphiopsis Bouvier (Hemileucinae) were the dominant genera in abundance and species richness. Only Automeris illustris (Walker), Gamelia remissoides Lemaire, and Hidripa paranensis (Bouvier) (Hemileucinae) were recorded in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Inventory; Neotropical; Phenology; Research promotion; Silk moths.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602827

Gold metallogenesis at the Pari Mine, NE-Quadrilátero Ferrífero, MG-Brazil
Provedor de dados: 42
Autores: ABREU,GUSTAVO C.; SCHORSCHER,HANS D.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300015

A retrospective analysis of scientific publications on the deep sea from 1987 to 2016
Provedor de dados: 42
Autores: BOOS,HARRY; RODRIGUES,CHARLES; ARAUJO,PAULA B.
Abstract: The deep sea remains the least known biome. Despite this fact, anthropic activities have affected these regions in various ways. The objective of this study was to outline the scientific production scenario based on deep sea research and to analyze trends present in the literature. For this, the bibliographical resources available from the Web of Science (WoS) were surveyed. Between 1987 and 2016, 11,079 articles on the deep sea were published. Growth was over 100% from the first to second decade and 75% from the second to third. The most productive countries were the USA, Germany, France, England and Japan. Of the 404 journals that published articles on the deep sea, 10% accounted for approximately 60% of the total published articles. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometrics; Databases for scientific publications; Deep sea; Growth rate for science; Information research; Infometrics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500607

The larva of Neoneura confundens Wasscher and van’t Bosch, 2013 (Odonata, Coenagrionidae) and key to the larvae of genus
Provedor de dados: 42
Autores: RODRÍGUEZ,JOSÉ S.; MOLINERI,CARLOS.
Abstract: The beautifully colored damselflies included in Neoneura Selys are divided in 28 species known from North, Central and South America. Larval stage is little known, only seven species were described at this stage. We describe and illustrate the final instar larva of Neoneura confundens for the first time. Adults associated to this larva correspond to the blue form of the species and are also discussed and illustrated. The larva of N. confundens is similar to other Neoneura larvae, showing 1 premental seta and a well-marked nodus in caudal lamellae, but it can be differentiated by having fringed posterior margin in all tibiae and in middle and hind tarsi, among other characters. A key to known larvae of Neoneura and new records extending the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protoneuridae; Zygoptera; Immature stage; Larval identification.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700603

Late Pleistocene echimyid rodents (Rodentia, Hystricognathi) from northern Brazil
Provedor de dados: 42
Autores: FERREIRA,THAIS M.F.; OLIVARES,ADRIANA ITATI; KERBER,LEONARDO; DUTRA,RODRIGO P.; AVILLA,LEONARDO S.
ABSTRACT Echimyidae (spiny rats, tree rats and the coypu) is the most diverse family of extant South American hystricognath rodents (caviomorphs). Today, they live in tropical forests (Amazonian, coastal and Andean forests), occasionally in more open xeric habitats in the Cerrado and Caatinga of northern South America, and open areas across the southern portion of the continent (Myocastor). The Quaternary fossil record of this family remains poorly studied. Here, we describe the fossil echimyids found in karst deposits from southern Tocantins, northern Brazil. The analyzed specimens are assigned to Thrichomys sp., Makalata cf. didelphoides and Proechimys sp. This is the first time that a fossil of Makalata is reported. The Pleistocene record of echimyids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caviomorphs; Echimyidae; Fossil record; Quaternary; South America.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300829

Asilidae (Diptera) of two Atlantic Forest protected areas of Rio de Janeiro, Southeastern Brazil
Provedor de dados: 42
Autores: MOREIRA-JUNIOR,DANILO P.; MAIA,VALÉRIA C.
ABSTRACT As few Asilidae inventories of Rio de Janeiro areas have been published, there are many data gaps. This paper aims to contribute to the knowledge of richness, abundance and distribution of this family in this State. From January 2013 to March 2014, insects were collected monthly using Malaise traps and every two months using entomological nets in the Reserva Biológica União (REBIO), and Estação Ecológica Estadual de Guaxindiba (EEEG). 682 specimens of Asilidae were collected in the present study, distributed in 31 genera and 51 species (20 identified and 31 unidentified), 527 of REBIO (in 19 genera and 38 species - 14 identified and 24 unidentified), and 155 specimens of EEEG (in 12 genera and 19 species - 6 identified and 13 unidentified)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Distribution; Richness; Tableland forest; Dense ombrophilous forest.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401579

Cones in the Euclidean space with vanishing scalar curvature
Provedor de dados: 42
Autores: Barbosa,João Lucas M.; Carmo,Manfredo do.
Given a hypersurface M on a unit sphere of the Euclidean space, we define the cone based on M as the set of half-lines issuing from the origin and passing through M. By assuming that the scalar curvature of the cone vanishes, we obtain conditions under which bounded domains of such cone are stable or unstable.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stability; R-curvature; Cone; Scalar curvature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400001

Molecular variability in Amerindians: widespread but uneven information
Provedor de dados: 42
Autores: SALZANO,FRANCISCO M.
A review was made in relation to the molecular variability present in North, Central, and South American Indian populations. It involved results from ancient DNA, mitochondrial DNA in extant populations, HLA and other autosomal markers, X and Y chromosome variation, as well as data from parasitic viruses which could show coevolutionary changes. The questions considered were their origin, ways in which the early colonization of the continent took place, types and levels of the variability which developed, peculiarities of the Amerindian evolutionary processes, and eventual genetic heterogeneity which evolved in different geographical areas. Although much information is already available, it is highly heterogeneous in relation to populations and types of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amerindians; Genetic polymorphisms; Population genetic variability; Human microevolution.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200005

Glands on the foliar surfaces of tribe Cercideae (Caesapiniodeae, Leguminosae): distribution and taxonomic significance
Provedor de dados: 42
Autores: DUARTE-ALMEIDA,JOAQUIM M.; CLEMENTE,MILENE S.; ARRUDA,ROSANI C.O.; VAZ,ANGELA M.S.F.; SALATINO,ANTONIO.
Large elongated glands occur on Cercideae leaf surfaces. Leaves of Bauhinia (55 taxa, 53 species), Cercis (1 species), Phanera (1 species), Piliostigma (2 species), Schnella (19 species) and Tylosema (1 species) were observed to determine location and relative number of glands. They were only observed on the abaxial leaf surface of 42 Bauhinia taxa. The glands were analyzed by light stereomicroscope and scanning electron microscopy. They are large (up to 270 µm long and 115 µm wide) and multicellular, containing lipophilic substances, probably volatile oils. Presence or absence and density of the glands in species of Bauhinia may be useful to determine species delimitation or distinction among infraspecific taxa. Higher density of glands is more common in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bauhinia; Brazilian forest; Leguminosae; Secretory structure; Taxonomy; Tropical ecosystems.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200787

High-fat diet and streptozotocin in the induction of type 2 diabetes mellitus: a new proposal
Provedor de dados: 42
Autores: MAGALHÃES,DIEGO A. DE; KUME,WILLIAN T.; CORREIA,FRANCYELE S.; QUEIROZ,THAÍS S.; ALLEBRANDT NETO,EDGAR W.; SANTOS,MAÍSA P. DOS; KAWASHITA,NAIR H.; FRANÇA,SUÉLEM A. DE.
Our objective was to establish a diabetes mellitus type 2 (DM2) model in rats using a high-fat diet and streptozotocin (HF-STZ). Male Wistar rats (240-250g) were divided into a control group (commercial feed), and HF-STZ group, (66.5%-commercial feed, 13.5%-lard, and 20%-sugar). STZ (40mg/kg i.p.) or vehicle was administered on the 13th day. An oral glucose tolerance test (OGTT) was performed (2.5mg of glucose/kg v.o.) on both groups. After 39 days of treatment, blood and tissue samples were collected for analyses. The weight gain after STZ administration was lower in the HF-STZ group than in the control group with reductions in muscle mass and adipose tissue. The HF-STZ group showed hyperglycemia after STZ administration (glucose on day 39: HF-STZ: 499 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabetes mellitus type 2 model; High-fat diet; Streptozotocin; Rats.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100615

Elevated mazes as animal models of anxiety: effects of serotonergic agents
Provedor de dados: 42
Autores: Pinheiro,Simone H.; Zangrossi-Jr.,Hélio; Del-Ben,Cristina M.; Graeff,Frederico G.
This article reviews reported results about the effects of drugs that act upon the serotonergic neurotransmission measured in three elevated mazes that are animal models of anxiety. A bibliographic search has been performed in MEDLINE using different combinations of the key words X-maze, plus-maze, T-maze, serotonin and 5-HT, present in the title and/or the abstract, with no time limit. From the obtained abstracts, several publications were excluded on the basis of the following criteria: review articles that did not report original results, species other than the rat, intracerebral drug administration alone, genetically manipulated rats, and animals having any kind of experimental pathology. The reported results indicate that the effect of drugs on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal model; Elevated maze; Anxiety; Panic; Serotonin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100010

The anatomy of some orchid roots, the characterization of tomato mutants and the perception of evolution among graduate students
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200001

Towards the design of new and improved drilling fluid additives using molecular dynamics simulations
Provedor de dados: 42
Autores: Anderson,Richard L.; Greenwel,H. Christopher; Suter,James L.; Jarvis,Rebecca M.; Coveney,Peter V.
During exploration for oil and gas, a technical drilling fluid is used to lubricate the drill bit, maintain hydrostatic pressure, transmit sensor readings, remove rock cuttings and inhibit swelling of unstable clay based reactive shale formations. Increasing environmental awareness and resulting legislation has led to the search for new, improved biodegradable drilling fluid components. In the case of additives for clay swelling inhibition, an understanding of how existing effective additives interact with clays must be gained to allow the design of improved molecules. Owing to the disordered nature and nanoscopic dimension of the interlayer pores of clay minerals, computer simulations have become an increasingly useful tool for studying clay-swelling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clay swelling; Drilling fluids; Molecular dynamics simulation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100005

Automated bioacoustic identification of species
Provedor de dados: 42
Autores: Chesmore,David.
Research into the automated identification of animals by bioacoustics is becoming more widespread mainly due to difficulties in carrying out manual surveys. This paper describes automated recognition of insects (Orthoptera) using time domain signal coding and artificial neural networks. Results of field recordings made in the UK in 2002 are presented which show that it is possible to accurately recognize 4 British Orthoptera species in natural conditions under high levels of interference. Work is under way to increase the number of species recognized.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Automated identification; Orthoptera; Bioacoustics; Time domain signal coding; Biodiversity informatics.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200037

Molecular survey of Anaplasma platys and Ehrlichia canis in dogs from Campo Grande, Mato Grosso do Sul, Brazil
Provedor de dados: 42
Autores: SOARES,RODRIGO; RAMOS,CARLOS ALBERTO; PEDROSO,THATIANNA; BABO-TERRA,VERÔNICA; CLEVELAND,HERBERT; ARAÚJO,FLÁBIO DE.
ABSTRACT This study investigated the frequency of infection by Anaplasma platys and Ehrlichia canis in dogs submitted to animal health centers in Campo Grande, state of Mato Grosso do Sul, Brazil. E. canis and A. platys showed infection frequencies of 55.75% and 16.96%, respectively. The identity of the two species was confirmed by DNA sequencing.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidemiology; NPCR; DNA; Midwestern Brazil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100301

Ecological niche modeling of Schinus molle reveals the risk of invasive species expansion into biodiversity hotspots
Provedor de dados: 42
Autores: LEMOS,RAFAEL P.M.; MATIELO,CRISTIANE B.D.; MARQUES JR.,ALCEMIR S.; SANTOS,MICHELE G. DOS; ROSA,VANESSA G. DA; SARZI,DEISE S.; ROSA,JOÃO VITOR S..; STEFENON,VALDIR M.
Abstract: Invasive species need a closer look on the threats they may cause to the environment, mainly considering the scenario of climatic changes predicted for the next decades. Schinus molle is a pioneer tree native from South America, reported as an important invasive species in four continents. Using ecological niche modeling we show that a wide area over the world is propitious for S. molle establishment under current climatic conditions, including 14 of the 25 world’s biodiversity hotspots. Current projections of climate changes suggest scenarios implying the rise of areas favorable for S. molle expansion. Therefore, particular attention should be taken in regions where it was introduced, while approaches for long-term intervention may be necessary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peruvian peppertree; Ecological niche modeling; Invasiveness; Ecosystem management.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700613

Quantification of anti-nutritional factors and their correlations with protein and oil in soybeans
Provedor de dados: 42
Autores: BUENO,RAFAEL D.; BORGES,LEANDRO L.; GOD,PEDRO I.V. GOOD; PIOVESAN,NEWTON D.; TEIXEIRA,ARLINDO I.; CRUZ,COSME DAMIÃO; BARROS,EVERALDO G. DE.
ABSTRACT Soybeans contain about 30% carbohydrate, mainly consisting of non-starch polysaccharides (NSP) and oligosaccharides. NSP are not hydrolyzed in the gastrointestinal tract of monogastric animals. These NSP negatively affect the development of these animals, especially the soluble fraction. This work aimed to establish a method to quantify NSP in soybeans, using high performance liquid chromatography (HPLC), and to estimate correlations between NSP, oligosaccharides, protein and oil. Sucrose, raffinose + stachyose, soluble and insoluble NSP contents were determined by HPLC. Oil and protein contents were determined by near-infrared spectroscopy (NIRS). The soluble PNAs content showed no significant correlation with protein, oil, sucrose and raffinose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Carbohydrates; Anti-nutritional factors; Quantitative analysis; HPLC; NIR spectroscopy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100205

Chemical migration during soil water retention curve evaluation
Provedor de dados: 42
Autores: Pires,Luiz F.; Villanueva,Felipe C.A.; Dias,Nivea M.P.; Bacchi,Osny O. Santos; Reichardt,Klaus.
Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca2+, Mg2+ and K+ on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca2+, Mg2+ and K+ during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analytical methods; Soil structure; Wetting-drying cycles; Soil physics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300028

Inactivation of yeast inorganic pyrophosphatase by organic solvents
Provedor de dados: 42
Autores: Grazinoli-Garrido,Rodrigo; Sola-Penna,Mauro.
A number of application for enzymes in organic solvents have been developed in chemical processing, food related conversions and analyses. The only unsolved problem related to nonaqueous enzymology is the notion that enzymes in organic solvent are mostly far less active than in water. Therefore, studies concerning the mechanisms by which enzymes are inactivated by organic solvents would reveal a clear understanding of the structure-function relationship of this phenomenon. Here we analyzed the effects of a series of alcohols (methanol, ethanol, 1-propanol and 2-propanol) and acetone on the activity of yeast inorganic pyrophosphatase. We observed that solvents inactivated the enzyme in a dose-dependent manner. This inactivation is also dependent on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic solvents; Enzyme; Yeast inorganic pyrophosphatase; Alcohol.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400006

Brazilian Bioluminescent Beetles: Reflections on Catching Glimpses of Light in the Atlantic Forest and Cerrado
Provedor de dados: 42
Autores: BECHARA,ETELVINO J.H.; STEVANI,CASSIUS V.
ABSTRACT Bioluminescence - visible and cold light emission by living organisms - is a worldwide phenomenon, reported in terrestrial and marine environments since ancient times. Light emission from microorganisms, fungi, plants and animals may have arisen as an evolutionary response against oxygen toxicity and was appropriated for sexual attraction, predation, aposematism, and camouflage. Light emission results from the oxidation of a substrate, luciferin, by molecular oxygen, catalyzed by a luciferase, producing oxyluciferin in the excited singlet state, which decays to the ground state by fluorescence emission. Brazilian Atlantic forests and Cerrados are rich in luminescent beetles, which produce the same luciferin but slightly mutated luciferases, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coleoptera; Bioluminescence; Luciferase; Luciferin; Luminous termitary; Oxidative stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200663

Carbon and nutrient stocks of three Fabaceae trees used for forest restoration and subjected to fertilization in Amazonia
Provedor de dados: 42
Autores: JAQUETTI,ROBERTO K.; GONÇALVES,JOSÉ FRANCISCO C.
ABSTRACT Amazonia is crucial to global carbon cycle. Deforestation continues to be one of the main causes of the release of C into the atmosphere, but forest restoration plantations can reverse this scenario. However, there is still diffuse information about the C and nutrient stocks in the vegetation biomass. We investigated the carbon and nutrient stocks of Fabaceae trees (Inga edulis, Schizolobium amazonicum and Dipteryx odorata) subjected to fertilization treatments (T1 - no fertilization; T2 - chemical; T3 - organic; and T4 - organic and chemical fertilization) in a degraded area of the Balbina Hydroelectric Dam, AM - Brazil. As an early successional species, I. edulis stocked more C and nutrients than the other two species independent of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Degraded ecosystems; Plant nutrition; Tropical tree species.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401761

New long-tailed pterosaurs (Wukongopteridae) from western Liaoning, China
Provedor de dados: 42
Autores: Wang,Xiaolin; Kellner,Alexander W.A.; Jiang,Shunxing; Cheng,Xin; Meng,Xi; Rodrigues,Taissa.
Two almost complete long-tailed pterosaurs from the Linglongta, Jianchang County, western Liaoning, China, are described and represent new taxa referred to the non-pterodactyloid clade Wukongopteridae. Kunpengopterus sinensis gen. et sp. nov. differs from other members of this clade mainly by the rounded posterior region of the skull, thick lacrimal process of the jugal and lack of a bony premaxillary crest. This species further shows a soft tissue crest above the frontal, a comparatively larger wing finger, and the proximal segment of the second pedal phalanx of the fifth toe shorter than in other wukongopterids. The second new species is referred to the genus Darwinopterus, D. linglongtaensis sp. nov. based on the posterior region of the skull. It...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Wukongopteridae; Kunpengopterus; Darwinopterus; Liaoning; China.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400024

Enhancement of clover growth by inoculation of P-solubilizing fungi and arbuscular mycorrhizal fungi
Provedor de dados: 42
Autores: Souchie,Edson L.; Azcón,Rosario; Barea,Jose M.; Silva,Eliane M.R.; Saggin-Júnior,Orivaldo J.
This study evaluated the synergism between several P-solubilizing fungi isolates and arbuscular mycorrhizal fungi to improve clover ( Trifolium pratense) growth in the presence of Araxá apatite. Clover was sown directly in plastic pots with 300g of sterilized washed sand, vermiculite and sepiolite 1:1:1 (v:v:v) as substrate, and grown in a controlled environment chamber. The substrate was fertilized with 3 g L-1 of Araxá apatite. A completely randomized design, in 8×2 factorial scheme (eight P-solubilizing fungi treatments with or without arbuscular mycorrhizal fungi)and four replicates were used. The P-solubilizing fungi treatments consisted of five Brazilian P-solubilizing fungi isolates (PSF 7, 9, 20, 21 and 22), two Spanish isolates ( Aspergillus niger...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araxá apatite; Phosphate solubilization; Co-inoculation; Plant growth promotion; Rhizosphere.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300023

Electrospun novel nanocomposite comprising polyurethane integrated with ayurveda amla oil for bone tissue engineering
Provedor de dados: 42
Autores: JAGANATHAN,SARAVANA KUMAR; MANI,MOHAN P.
Abstract  Ayurveda oil contains numerous source of biological constituents which plays an important role in reducing the pain relief caused during bone fracture. The aim of the study is to fabricate the polyurethane (PU) scaffold for bone tissue engineering added with ayurveda amla oil using electrospinning technique. Scanning Electron Microscopy (SEM) analysis showed that the fabricated nanocomposites showed reduced fiber diameter (758 ± 185.46 nm) than the pristine PU (890 ± 116.91 nm). Fourier Infrared Analysis (FTIR) revealed the existence of amla oil in the PU matrix by hydrogen bond formation. The contact angle results revealed the decreased wettability (116° ± 1.528) of the prepared nanocomposites compared to the pure PU (100° ± 0.5774). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Ayurveda oil; Electrospun scaffold; Blood compatibility; Bone tissue engineering.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101101

Endophytic colonization of rice (Oryza sativa L.) by the diazotrophic bacterium Burkholderia kururiensis and its ability to enhance plant growth
Provedor de dados: 42
Autores: Mattos,Katherine A.; Pádua,Vania L.M.; Romeiro,Alexandre; Hallack,Leticia F.; Neves,Bianca C.; Ulisses,Tecia M.U.; Barros,Claudia F.; Todeschini,Adriane R.; Previato,José O.; Mendonça-Previato,Lucia.
Burkholderia kururiensis is a diazotrophic bacterium originally isolated from a polluted aquifer environment and presents a high level of similarity with the rice endophyte "B. brasilensis" species. This work assessed the ability of B. kururiensis to endophytically colonize rice plantlets by monitoring different tissues of root-inoculated plants for the presence of bacterial growth in different media, electron microscopy and by 16S rDNA analysis. Observations of roots, stems and leaves of inoculated rice plantlets by electron microscopy revealed B. kururiensis colonization predominantly on root hair zones, demonstrating endophytic colonization primarily through the endodermis, followed by spreading into xylem vessels, a possible pathway leading to aerial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burkholderia kururiensis; Colonization; Rice; Diazotrophic bacterium; Auxin.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300009

Morphological and morphometric variability of the squid Lolliguncula brevis (Mollusca: Cephalopoda) in Brazilian waters: evidence for two species in the western atlantic?
Provedor de dados: 42
Autores: Zaleski,Tânia; Perez,José A. Angel; Gandara-Martins,Ana luiza.
Morphological and morphometric variability of the small-sized coastal squid Lolliguncula brevis was assessed along the largest part of its latitudinal range in the southern hemisphere, off the Brazilian coast (8º S - 27º S). A general homogeneity in form was found throughout the entire latitudinal range. In terms of body proportions, no latitudinal gradients were evident, but a few local "morphotypes" could be distinguished. The distinctive egg mass morphology, and size and form features, including a hectocotylus 20-40% longer than the opposing ventral arm and the presence of suckers on the buccal membrane, indicated that Lolliguncula from northern and southern hemispheres might comprise two different taxa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cephalopods; Morphology; Loliginidae; Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400016

Superoxide dismutase and lipid hydroperoxides in blood and endometrial tissue of patients with benign, hyperplastic and malignant endometrium
Provedor de dados: 42
Autores: Pejić,Snežana; Todorović,Ana; Stojiljković,Vesna; Cvetković,Dragana; Lučić,Nenad; Radojičić,Ratko M.; Saičić,Zorica S.; Pajovic,Snežana B.
Epidemiological and experimental data point to involvement of oxygen derived radicals in the pathogenesis of gynecological disorders, as well as in cancer development. The objective of the present study was to examine changes in activities and levels of copper/zinc superoxide dismutase (CuZnSOD) and lipid hydroperoxides (LOOH) in blood and endometrial tissue of patients diagnosed with uterine myoma, endometrial polypus, hyperplasia simplex, hyperplasia complex and adenocarcinoma endometrii. The results of our study have shown decreased SOD activities and unchanged SOD protein level in blood of all examined patients in comparison to healthy subjects. Decrease of both SOD activity and level was found in endometrium of patients with hyperplasia simplex,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper/zinc superoxide dismutase; Lipid hydroperoxides; Uterine myoma; Endometrial polypus; Endometrial hyperplasia; Endometrial adenocarcinoma.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300011

Extraction of bioactive compounds and free radical scavenging activity of purple basil (Ocimum basilicum L.) leaf extracts as affected by temperature and time
Provedor de dados: 42
Autores: PEDRO,ALESSANDRA C.; MOREIRA,FERNANDA; GRANATO,DANIEL; ROSSO,NEIVA D.
In the current study, response surface methodology (RSM) was used to assess the effects of extraction time and temperature on the content of bioactive compounds and antioxidant activity of purple basil leaf (Ocimum basilicum L.) extracts. The stability of anthocyanins in relation to temperature, light and copigmentation was also studied. The highest anthocyanin content was 67.40 mg/100 g extracted at 30 °C and 60 min. The degradation of anthocyanins with varying temperatures and in the presence of light followed a first-order kinetics and the activation energy was 44.95 kJ/mol. All the extracts exposed to light showed similar half-lives. The extracts protected from light, in the presence of copigments, showed an increase in half-life from 152.67 h for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthocyanins; Extraction; Pigments; Response surface methodology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301055

Trade-off between reservoir yield and evaporation losses as a function of lake morphology in semi-arid Brazil
Provedor de dados: 42
Autores: Campos,José N.B.; Lima Neto,Iran E.; Studart,Ticiana M.C.; Nascimento,Luiz S.V.
This study investigates the relationships between yield and evaporation as a function of lake morphology in semi-arid Brazil. First, a new methodology was proposed to classify the morphology of 40 reservoirs in the Ceará State, with storage capacities ranging from approximately 5 to 4500 hm3. Then, Monte Carlo simulations were conducted to study the effect of reservoir morphology (including real and simplified conical forms) on the water storage process at different reliability levels. The reservoirs were categorized as convex (60.0%), slightly convex (27.5%) or linear (12.5%). When the conical approximation was used instead of the real lake form, a trade-off occurred between reservoir yield and evaporation losses, with different trends for the convex,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaporation losses; Hydrological modeling; Lake morphology; Reservoir yield; Semi-arid regions; Water availability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301113

Groundwater resources in the State of São Paulo (Brazil): the application of indicators
Provedor de dados: 42
Autores: Hirata,Ricardo; Suhogusoff,Alexandra; Fernandes,Amélia.
Indicators, for groundwater resources, have mostly been employed to define the present status and the degradation tendency, regarding both quantity (under- or overexploitation) and quality (natural and anthropic contamination). This work presents the application of indicators in order to draw a picture of the groundwater resources situation in the 22 Water Resource Management Units (WRMU) of the State of São Paulo. The seven Indicators (I1 to I7) applied provide a general overview of groundwater dependence (I1, I2), availability (I3, I4), and quality (I5, I6, I7). Considering public supply (Indicator 1), one observes that 9 WRMUs show high (&gt;50% of the population supplied by groundwater), 6, intermediate (49-25%), and 7, low (&lt;24%) dependence on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Groundwater; São Paulo; Public water supply; Management; Indicators.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100016

Minimal surfaces in euclidean 3-space and their mean curvature 1 cousins in hyperbolic 3-space
Provedor de dados: 42
Autores: Fujimori,Shoichi.
We show that the Hopf differentials of a pair of isometric cousin surfaces, a minimal surface in euclidean 3-space and a constant mean curvature (CMC) one surface in the 3-dimensional hyperbolic space, with properly embedded annular ends, extend holomorphically to each end. Using this result, we derive conditions for when the pair must be a plane and a horosphere.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minimal surfaces; CMC 1 cousins; Hyperbolic space.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300002

Acute toxicity and histopathology in ornamental fish amazon bluespotted corydora (Corydoras melanistius) exposed to formalin
Provedor de dados: 42
Autores: Santos,Rudã F.B.; Dias,Henrique M.; Fujimoto,Rodrigo Y.
The objective of this work was to evaluate the acute toxicity of formalin and histopathological effects on the Amazon ornamental fish, bluespotted coridora (Corydoras melanistius). A randomized design was used, with ten concentrations of formalin (40%) (0, 3, 6, 12, 25, 50, 100, 150, 200 and 250mg.L-1) with four replicates and five fish per container (3L) in static system for 96 hours. The moribund fish were killed and fixed in 10% formalin to proceed the histopathological analysis of gill, liver and kidney. At the end of this experiment the following mortality rates (%) were obtained in increasing order of exposure: 0, 0, 0, 0, 0, 65, 85, 100, 100 and 100%. The lethal concentration 50% (LC50-96h (I)) estimated was 50.76 mg.L-1 with regression of y =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lethal concentration; Corydora; Formaldehyde; Toxicity; Histology; Amazon.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400014

Effect of gamma irradiation on the nutritional quality of Agaricus bisporus strains cultivated in different composts
Provedor de dados: 42
Autores: ANDRADE,MEIRE C.N.; JESUS,JOÃO P.F.; VIEIRA,FABRÍCIO R.; VIANA,STHEFANY R.F.; SPOTO,MARTA H.F.; MINHONI,MARLI T.A.
The effect of irradiation doses (0, 125, 250 and 500 Gy) on the nutritional quality of A. bisporus mushrooms (strains ABI-07/06, ABI-05/03 and PB-1) cultivated in composts based on oat straw (Avena sativa) and brachiaria (Brachiaria sp.) was evaluated. The experimental design was 4 x 3 x 2 factorial scheme (irradiation doses x strains x composts), with 24 treatments, consisting of two repetitions each, totaling 48 experimental units (samples of mushrooms). The samples were irradiated in Cobalt-60 irradiator, model Gammacell 220 kGy, with dose rate of 0.740 kGy h–1, according to the treatments proposed. Subsequently, the control (unirradiated) and the other treatments were maintained at 4±1°C and 90% RH in a climatic chamber for carrying out the chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agaricus bisporus; Productivity; Strains; Compost; Nutritional value.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200897

Thiol/disulfide status regulates the activity of thiol-containing kinases related to energy homeostasis in rat kidney
Provedor de dados: 42
Autores: RECH,VIRGINIA C.; MEZZOMO,NATHANA J.; ATHAYDES,GENARO A.; FEKSA,LUCIANE R.; FIGUEIREDO,VANDRÉ C.; KESSLER,ADRIANA; FRANCESCHI,ITIANE D. DE; WANNMACHER,CLOVIS M.D.
ABSTRACT Considering that thiol-containing enzymes like kinases are critical for several metabolic pathways and energy homeostasis, we investigated the effects of cystine dimethyl ester and/or cysteamine administration on kinases crucial for energy metabolism in the kidney of Wistar rats. Animals were injected twice a day with 1.6 µmol/g body weight cystine dimethyl ester and/or 0.26 µmol/g body weight cysteamine from the 16th to the 20th postpartum day and euthanized after 12 hours. Pyruvate kinase, adenylate kinase, creatine kinase activities and thiol/disulfide ratio were determined. Cystine dimethyl ester administration reduced thiol/disulfide ratio and inhibited the kinases activities. Cysteamine administration increased the thiol/disulfide ratio and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cysteamine; Cystine dimethyl ester; Kinases activities; Renal energy metabolism.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100099

Transmissivity of Aquifer by Capture Zone Method: An Application in the Sete Lagoas Karst Aquifer, MG, Brazil
Provedor de dados: 42
Autores: GALVÃO,PAULO; HALIHAN,TODD; HIRATA,RICARDO.
ABSTRACT Transmissivity is an important hydraulic parameter to determine the amount of water passed horizontally across a given saturated thickness of an aquifer. The techniques to quantify this parameter, such as grain size analyses or pumping tests, can have limitations of time/spatial scale, viability, or economically. One technique that can be used, but little adopted, is the capture zone analysis. In this paper, capture zone analytical equations were used to estimate transmissivity values in order to verify the effectiveness of this methodology as alternative in situations where other traditional methods present implementation difficulties. The results were compared with field data estimated by aquifer tests conducted in the same region. A sensitivity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transmissivity; Capture zone; Aquifer test; Brazil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100091

Phytochemical Screening and Acute Toxicity of Aqueous Extract of Leaves of Conocarpus erectus Linnaeus in Swiss Albino Mice
Provedor de dados: 42
Autores: NASCIMENTO,DAYANE K.D.; SOUZA,IVONE A. DE; OLIVEIRA,ANTÔNIO F.M. DE; BARBOSA,MARIANA O.; SANTANA,MARLLON A.N.; PEREIRA JÚNIOR,DANIEL F.; LIRA,EDUARDO C.; VIEIRA,JEYMESSON R.C.
ABSTRACT Mangroves represent areas of high biological productivity and it is a region rich in bioactive substances used in medicine production. Conocarpus erectus (Combretaceae) known as button mangrove is one of the species found in mangroves and it is used in folk medicine in the treatment of anemia, catarrh, conjunctivitis, diabetes, diarrhea, fever, gonorrhea, headache, hemorrhage, orchitis, rash, bumps and syphilis. The present study aimed to investigate the acute toxicity of aqueous extract of leaves of C. erectus in Swiss albino mice. The plant material was collected in Vila Velha mangroves, located in Itamaracá (PE). The material was subjected to a phytochemical screening where extractive protocols to identify majority molecules present in leaves...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute toxicity; Aqueous extract; Conocarpus erectus; Medicinal plants; Plants extracts.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401431

Evaluation of motorcyclist's discomfort during prolonged riding process with and without lumbar support
Provedor de dados: 42
Autores: Karuppiah,Karmegam; Salit,Mohd S.; Ismail,Mohd Y.; Ismail,Napsiah; Tamrin,Shamsul B.M.
OBJECTIVE: The primary aim of this study is to examine the effects of a backrest: using a prototype of a lumbar support presented in author's earlier study on the discomfort rating of the body parts of motorcyclist. METHODS: One hundred motorcyclists participated in this study, all in good physical condition and with no immediate complaint of musculoskeletal disorders. Each participant was asked to sit for 2 hours on a motorcycle in two different sessions (with and without the lumbar support) in a controlled room environment. At every 15 minutes interval the participants were required to rate their discomfort level on the Borg's CR-10 questionnaire. RESULTS: The rate of discomfort level (in all body parts) decreased over time during the testing period with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ergonomic; Lumbar Support; Motorcyclists; Borg's CR-10 Scale; Discomfort.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400031

Nonlinear elliptic systems
Provedor de dados: 42
Autores: DEFIGUEIREDO,DJAIRO G.
In this paper we treat the question of the existence of solutions of boundary value problems for systems of nonlinear elliptic equations of the form - deltau = f (x, u, v,&lt;FONT FACE="Symbol"&gt;Ñ&lt;/FONT&gt;u,&lt;FONT FACE="Symbol"&gt;Ñ&lt;/FONT&gt;v), - deltav = g(x, u, v, &lt;FONT FACE="Symbol"&gt;Ñ&lt;/FONT&gt;u, &lt;FONT FACE="Symbol"&gt;Ñ&lt;/FONT&gt;v), in omega, We discuss several classes of such systems using both variational and topological methods. The notion of criticality takes into consideration the coupling, which plays important roles in both a priori estimates for the solutions and Palais-Smale conditions for the associated functional in the variational case.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elliptic equations; Variational methods; Palais-smale conditions; Leray-schauder degree; A priori bounds.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400002

Metahalloysite clays of Poços de Caldas Alkaline Complex, MG-Brazil
Provedor de dados: 42
Autores: SCHORSCHER,HANS D.; DE-OLIVEIRA,RENATA A.R.N.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300033

Bacteriological larvicides of dipteran disease vectors
Provedor de dados: 42
Autores: SILVA-FILHA,MARIA HELENA N. L.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300041

An overview of the 2017 report of the French academy of Sciences on biodiversity
Provedor de dados: 42
Autores: LAVOREL,SANDRA; LEBRETON,JEAN-DOMINIQUE; MAHO,YVON LE.
Abstract: In the present context of concerns for biodiversity, the French Academy of Sciences produced in 2017 a report entitled “Mechanisms of adaptation of biodiversity to climate change and their limits”. We briefly review here the production process and structure of the report, and summarize its conclusions and recommendations. The conclusions emphasize the role of habitat fragmentation in the expected impact of climate change on biodiversity, in particular for organisms with limited dispersal abilities, and the disparities in species responses which must be taken to understand the future of species assemblages (“communities”) under different scenarios of climate change. The recommendations cover the organization of biodiversity research and monitoring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Climate change; Global change; Adaptation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600612

A new titanosaur sauropod from the Atacama Desert, Chile
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Rubilar-Rogers,David; Vargas,Alexander; Suárez,Mario.
Partial remains of a titanosaur sauropod collected in the Tolar Formation (Upper Cretaceous) at the Atacama Desert (Antofagasta Region), northern Chile, is described, and a new species, Atacamatitan chilensis gen. et sp. nov., is erected. The material consists mainly of dorsal and caudal vertebrae, part of a humerus and a femur. The presence of a titanosaur confirms the Cretaceous age for the outcrops of red sandstone of the Tolar Formation whose age was previously uncertain, ranging from the Upper Cretaceous to the Paleocene. The new specimen represents the most complete dinosaur reported for this region and one of the most complete titanosaur known from Chile and the pacific margin of South America so far.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinosauria; Titanosauria; Atacamatitan; Atacama Desert; Cretaceous.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100011

Occurrence of lace bug Vatiga illudens and Vatiga manihotae (Hemiptera: Tingidae) in Mato Grosso do Sul, midwestern Brazil
Provedor de dados: 42
Autores: Bellon,Patrícia P.; Wengrat,Ana P.G.S.; Kassab,Samir O.; Pietrowski,Vanda; Loureiro,Elisângela S.
Nymphs and adults of the lace bug (Hemiptera: Tingidae) have been found in cassava crops (Manihot esculenta) in Mato Grosso do Sul State, Brazil. The insects were collected in the field and taken to the laboratory where they were identified based on some morphological traits of the species Vatiga manihotae (Drake) and V. illudens (Drake), which are first reported in the aforementioned state.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Manihot esculenta; Lace bug; Registration.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300012

A new prozostrodontian cynodont (Therapsida) from the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil
Provedor de dados: 42
Autores: SOARES,MARINA B.; MARTINELLI,AGUSTÍN G.; OLIVEIRA,TÉO V. DE.
We report here on a new prozostrodontian cynodont, Botucaraitherium belarminoigen. et sp. nov., from the Late Triassic RiograndiaAssemblage Zone (AZ) of the Candelária Sequence (Santa Maria Supersequence), collected in the Botucaraí Hill Site, Candelária Municipality, state of Rio Grande do Sul, Brazil. The new taxon is based on a single specimen (holotype MMACR-PV-003-T) which includes the left lower jaw, without postdentary bones, bearing the root of the last incisor, canine and four postcanines plus one partial crown inside the dentary, not erupted, and two maxillary fragments, one with a broken canine and another with one postcanine. The features of the lower jaw and lower/upper postcanines resemble those of the prozostrodontians Prozostrodon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodontia; Prozostrodontia; Santa Maria Supersequence; Triassic.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401673

Tangency quantum cohomology and characteristic numbers
Provedor de dados: 42
Autores: KOCK,JOACHIM.
This work establishes a connection between gravitational quantum cohomology and enumerative geometry of rational curves (in a projective homogeneous variety) subject to conditions of infinitesimal nature like, for example, tangency. The key concept is that of modified psi classes, which are well suited for enumerative purposes and substitute the tautological psi classes of 2D gravity. The main results are two systems of differential equations for the generating function of certain top products of such classes. One is topological recursion while the other is Witten-Dijkgraaf-Verlinde-Verlinde. In both cases, however, the background metric is not the usual Poincaré metric but a certain deformation of it, which surprisingly encodes all the combinatorics of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enumerative geometry; Characteristic numbers; Quantum cohomology; Gromov-Witten invariants.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300002

Structure and transcription of genes encoding the surface glycoprotein antigens gp90 and gp82 of Trypanosoma cruzi metacyclic trypomastigotes
Provedor de dados: 42
Autores: Carmo,Mirian S.; Araya,Jorge E; Cano,Maria I.; Ramirez,Marcel I.; Baida,Renata P.; Ruiz,Rita C.; Santos,Marcia R.; Chiurillo,Miguel A.; Ramirez,José L.; Yoshida,Nobuko; Silveira,José Franco da.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100017

B-1 cell: the precursor of a novel mononuclear phagocyte with immuno-regulatory properties
Provedor de dados: 42
Autores: Lopes,José Daniel; Mariano,Mario.
Characterization of the origin, properties, functions and fate of cells is a fundamental task for the understanding of physiological and pathological phenomena. Despite the bulk of knowledge concerning the diverse characteristics of mammalian cells, some of them, such as B-1 cells, are still poorly understood. Here we report the results obtained in our laboratory on these cells in the last 10 years. After showing that B-1 cells could be cultured and amplified in vitro, a series of experiments were performed with these cells. They showed that B1 cells reside mostly in the peritoneal and pleural cavities, migrate to distant inflammatory foci, coalesce to form giant cells and participate in granuloma formation, both in vitro and in vivo. They are also able to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: B-1 cells; IL-10; Inflammation; Infection; Neoplasia; BALB/Xid mice.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300013

Sommerxylon spiralosus from Upper Triassic in southernmost Paraná Basin (Brazil): a new taxon with taxacean affinity
Provedor de dados: 42
Autores: Pires,Etiene F.; Guerra-Sommer,Margot.
The anatoical description of silici?ed Gymnospermae woods from Upper Triassic sequences of southernmost Paraná Basin (Brazil) has allowed the identi?cation of a new taxon: Sommerxylon spiralosus n.gen. et n.sp. Diagnostic parameters, such as heterocellular medulla composed of parenchymatous and sclerenchymatous cells, primary xylem endarch, secondary xylem with dominant uniseriate bordered pits, spiral thickenings in the radial walls of tracheids, medullar rays homocellular, absence of resiniferous canals and axial parenchyma, indicate its relationship with the family Taxaceae, reporting on the first recognition of this group in the Triassic on Southern Pangea. This evidence supports the hypothesis that the Taxaceae at the Mesozoic were not con?ned to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fossil wood; Taxacean affinity; Upper Triassic; Paraná Basin.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300013

Geology and petrography of the graciosa granites (Southern Brazil)
Provedor de dados: 42
Autores: GUALDA,GUILHERME A. R.; VLACH,SILVIO R. F.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300023

Pollen analysis of Holocene sediments from the Poço das Antas National Biological Reserve, Silva Jardim, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Coelho,Luciane G.; Barth,Ortrud M.; Araujo,Dorothy S.D. de.
The Poço das Antas National Biological Reserve is located in Rio de Janeiro State, southeast Brazil. This paper presents information on past environmental characteristics of the area through pollen analysis. Two sedimentary columns were collected and five samples were selected for radiocarbon dating. The following ages of the columns from bottom to top were detected: column 1 - 1.20-1.16 m: 6080 ±40 years BP, 0.775-0.735 m: 4090 ±40 years BP, 0.385-0.345 m: 1880 ±80 years BP; column 2 - 1.22-1.18 m: 3520 ±40 years BP, 0.23-0.19 m: 1810 ±40 years BP. Three samples from column 1 and two samples from column 2 were selected for pollen analysis: 1.20 m, 0.77 m and 0.37 m of column1 and 1.22 m and 0.21 m of column 2. Chemical treatment followed standard...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleo-environment; Holocene; Brazil.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300013

LETTER TO THE EDITOR: Dealing with predatory publishing is a shared responsibility: the role of Latin American journals
Provedor de dados: 42
Autores: MEMON,AAMIR R.
Tipo: Info:eu-repo/semantics/other
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700151

A new concept for insect damage evaluation based on plant physiological variables
Provedor de dados: 42
Autores: Neves,Ademir D.; Oliveira,Ricardo F.; Parra,José R.P.
The objective of this study was to determine the damage levels caused by Orthezia praelonga Douglas, 1891 and Leucoptera coffeella (Guérin-Mèneville 1842), on rangpur lime and Obatã coffee leaves, respectively. Measurements were based on a new concept for the evaluation of the following plant physiological parameters: photosynthesis, stomatal conductance, leaf temperature and transpiration, and internal concentration of CO2 (by infrared analyzer). A negative correlation between infestation level and photosynthesis was found, where the negative inflexion point of the curve was considered as a reference for damage levels. The control level for O. praelonga is below the 7-13% limit for damaged leaf area (40 to 70 scales per leaf), while for L. coffeella it is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosynthesis; Economic level injury; Citrus; Coffee; Plant-insect interactions.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400015

Assessment and kinetics of soil phosphatase in Brazilian Savanna systems
Provedor de dados: 42
Autores: FERREIRA,ADÃO S.; ESPÍNDOLA,SUÉLLEN P.; CAMPOS,MARIA RITA C.
The activity and kinetics of soil phosphatases are important indicators to evaluate soil quality in specific sites such as the Cerrado (Brazilian Savanna). This study aimed to determine the activity and kinetic parameters of soil phosphatase in Cerrado systems. Soil phosphatase activity was assessed in samples of native Cerrado (NC), no-tillage (NT), conventional tillage (CT) and pasture with Brachiaria brizantha (PBb) and evaluated with acetate buffer (AB), tris-HCl buffer (TB), modified universal buffer (MUB) and low MUB. The Michaelis-Menten equation and Eadie-Hofstee model were applied to obtain the kinetic parameters of soil phosphatase using different concentrations of p-nitrophenol phosphate (p-NPP). MUB showed the lowest soil phosphatase activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil phosphatase activity; Buffer; Enzyme kinetics; Michaelis-Menten equation; Eadie-Hofstee model; Cerrado.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301035

First detection of the cosmopolitan invader Leptoglossus occidentalis Heidemann (Heteroptera: Coreidae) in Argentina
Provedor de dados: 42
Autores: KUN,MARCELO E.; MASCIOCCHI,MAITÉ.
Abstract: Leptoglossus occidentalis Heidemann is a conifer seed bug, native to North America. This species is considered invasive and has reached several countries in the Northern Hemisphere and most recently Chile in South America. This work reports the first detection of this species in Argentina, with specimens from the Rio Negro province, in 2017. Ecological traits and its potential rapid spread were also discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exotic species; Foliated chinch bug; Invader; Pine plantation; Pinus spp.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500606

Bone turnover markers in sheep and goat: A review of the scientific literature
Provedor de dados: 42
Autores: CAMASSA,JOSÉ A.; DIOGO,CAMILA C.; SOUSA,CRISTINA P.; AZEVEDO,JORGE T.; VIEGAS,CARLOS A.; REIS,RUI L.; DOURADO,NUNO; DIAS,ISABEL R.
ABSTRACT Bone turnover markers (BTMs) are product of bone cell activity and are generally divided in bone formation and bone resorption markers. The purpose of this review was to structure the available information on the use of BTMs in studies on small ruminants, especially for monitoring their variations related to diet, exercise, gestation and metabolic lactation state, circadian and seasonal variations, and also during skeletal growth. Pre-clinical and translational studies using BTMs with sheep and goats as animal models in orthopaedic research studies to help in the evaluation of the fracture healing process and osteoporosis research are also described in this review. The available information from the reviewed studies was systematically organized in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone formation markers; Bone resorption markers; Bone metabolism; Small ruminants.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100231

Interspecific interaction between Telenomus remus (Hymenoptera: Platygastridae) and Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) on Spodoptera frugiperda (Lepidoptera: Noctuidae) eggs
Provedor de dados: 42
Autores: Carneiro,Tatiana R.; Fernandes,Odair A.
This work aimes to evaluate the interspecific interaction between Trichogramma pretiosum and Telenomus remus, two biological control agents of fall armyworm (Spodoptera frugiperda) eggs. Eggs of Spodoptera frugiperda previously parasitized by Telenomus remus were offered to Trichogramma pretiosum, and those parasitized by Trichogramma pretiosum were offered to Telenomus remus. The previously parasitized eggs were tested at different embryonic development stages for each parasitoid. In addition, to evaluate the competition between species, Spodoptera frugiperda eggs were offered to the parasitoids simultaneously. The behavior of the insects was recorded under a stereomicroscope. When Spodoptera frugiperda eggs were previously exposed to either parasitoid,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Intraguild competition; Egg parasitoid; Parasitoid behavior.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400027

Study of the radioactive disequilibrium of the volcanic rocks from the Trindade Island (Brazil)
Provedor de dados: 42
Autores: SANTOS,ROSANA N.; MARQUES,LEILA S.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300032

The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil
Provedor de dados: 42
Autores: Pereira,Edisio; Baptista-Neto,José A.; Smith,Bernard J.; Mcallister,John J.
In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Urban runoff; Guanabara Bay.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400013

An oviposition trap to collect immatures of coprophagous moth flies (Diptera: Psychodidae)
Provedor de dados: 42
Autores: LIMA,DAYANA A.; CORDEIRO,DANILO P.; FRANKLIN,ELIZABETH.
Abstract  Larvae of Psychodidae develop in a variety of breeding sites, including vertebrate feces. As searching for the larvae can be an extremely difficult task, immatures of many species are little known, with descriptions of coprophagous moth flies all from outside the Neotropics. In an attempt to mitigate this challenge, we tested an oviposition trap using cattle dung as attractant, measured the efficiency and specificity of the traps and the most efficient period of exposition in the field. With 60 traps installed in one fragment of ombrophilous forest, 344 immatures were collected, distributed in four species of Psychoda and one of Feuerborniella. Psychodidae accounted for 75% of the collected Diptera. The high specificity of the trap to Psychodidae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle-Arthropoda; Immature insects; Psychodinae; Sampling efficiency.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100709

Structural characterization of vegetative organs of the endangered Brazilian native species Hesperozygis ringens (Benth.) Epling
Provedor de dados: 42
Autores: PINHEIRO,CARLOS G.; OLIVEIRA,JOÃO MARCELO S. DE; HEINZMANN,BERTA M.
Abstract The aim of this study was to describe the structural characterization of Hesperozygis ringens (Benth.) Epling vegetative organs. For this purpose, leaves, stems and roots of the endangered Lamiaceae were collected from a population located in Santo Antão, Santa Maria municipality, Rio Grande do Sul, Brazil. Results demonstrated that the H. ringens leaf blade presents glandular and non-glandular trichomes as well as two morphs of diallelocytic stomata, which are usually found above the epidermis level. The petiole is concave on ventral face and convex on its dorsal face, containing glandular and non-glandular trichomes as well as stomata in the epidermis. These types of trichomes were also detected in the stem. In addition, the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lamiaceae; Leaf blade; Petiole; Root; Stem.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602887

Fishing strategies among prehistoric populations at Saquarema Lagoonal Complex, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Guimarães,Márica B.
Two distinct fishing technologies were identified among the shellmound builders of the Saquarema Lagoonal Complex, in the Brazilian state of Rio de Janeiro: bone point technology and worked fish spines. These technologies were related to the acquisition of specific fish resources; Worked fish spines were used in the capture of Micropogonias furnieri (Desmarest), and bone points used for fishing specimens of the Ariidae family. Worked spines technology was predominant between 6,726 cal. years BP and 3,699 cal. years BP, while the bone point technology was dominant after 3,699 cal. years BP. It is believed these different strategies for obtaining fishing resources before 3,699 years cal. BP was related to environmental. Notably the gradual regression of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subsistence resources; Fishing strategies; Shellmound; Holocene.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100415

Occurrence and evolutionary inferences about Kranz anatomy in Cyperaceae (Poales)
Provedor de dados: 42
Autores: MARTINS,SHIRLEY; ALVES,MARCCUS; SCATENA,VERA L.
ABSTRACT Cyperaceae is an angiosperm family with the greatest diversity of species with Kranz anatomy. Four different types of Kranz anatomy (chlorocyperoid, eleocharoid, fimbristyloid and rhynchosporoid) have been described for this angiosperm family, and the occurrence and structural characteristics of these types are important to trace evolutionary hypotheses. The purpose of this study was to examine the available data on Cyperaceae Kranz anatomy, emphasizing taxonomy, geographic distribution, habitat and anatomy, to infer the potential origin of the Kranz anatomy in this family. The results showed that the four types of Kranz anatomy (associated with C4 photosynthesis) in Cyperaceae emerged numerous times in unrelated phylogenetic groups. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Ultrastructure; Taxonomy; Phylogeny; Cyperaceae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502177

Phytogeographical patterns of dry forests sensu stricto in northern Minas Gerais State, Brazil
Provedor de dados: 42
Autores: ARRUDA,DANIEL M.; FERREIRA-JUNIOR,WALNIR G.; DUQUE-BRASIL,REINALDO; SCHAEFER,CARLOS E.R.
The Deciduous Complex that occurs in northern Minas Gerais State, Brazil, raises questions about the floristic affinities of these formations in relation to neighboring phytogeographical domains. Little is known about the identity of the seasonal forest formations that comprise this complex, or about its relationships to abiotic components, such as soils, topography and climate. This study aimed to recognize the patterns of floristic similarity of all studied fragments of dry forest of northern Minas Gerais with soil and climate attributes, based on the available database. Cluster analysis indicated the existence of two floristic groups that had clear associations with either the Koppen's BSh (semi-arid) or Aw (seasonal tropical) climates. Likewise, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate; Deciduous seasonal forest; Ecotone; Phytogeography; Soil.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200623

Temporal variation of bacterial population and response to physical and chemical parameters along a petrochemical industry wastewater treatment plant
Provedor de dados: 42
Autores: ANTUNES,THEMIS C.; BALLARINI,ANA E.; SAND,SUELI VAN DER.
Abstract: The petrochemical industry has played a considerable role in generation and release of waste in the environment. Activated sludge and facultative lagoons are commonly used for domestic and industrial wastewater treatment due to their low-cost and minimal need for operational requirements. Microorganisms present in wastewater treatment plant (WWTP) are responsible for most nutrient removal. In this study, microbiological and physicochemical parameters were used to estimate changes in bacterial community in a petrochemical industrial WWTP. The activated sludge was the place with higher heterotrophic bacterial quantification. Denitrifying bacteria was reduced at least 5.3 times throughout all collections samples. We observe a decrease in the total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Diversity; Wastewater treatment; Facultative lagoon; Activated sludge.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300616

Fossil woods (Coniferales) from the Baqueró Group (Aptian), Santa Cruz Province, Argentina
Provedor de dados: 42
Autores: Vera,Ezequiel I.; Césari,Silvia N.
Two new conifer morphospecies represented by a secondary xylem are reported for the Lower Cretaceous Baqueró Group (Santa Cruz Province, Argentina). Agathoxylon sp. is characterized by poorly defined growth rings, predominantly uniseriate pitting in the radial wall of the tracheids, cross fields with 1-6 pits and uniseriate rays. These features are shared with the leafy branches described for the unit as Araucaria grandifolia Feruglio emend. Del Fueyo and Archangelsky. The second taxon, Brachyoxylon sp. cf. B. boureaui, possesses poorly defined growth rings, mixed wood with predominantly uniseriate radial pitting, cross fields with 8-26 pits and uniseriate rays. These taxa represent the first fossil woods described for Baqueroan strata.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fossil woods; Agathoxylon; Brachyoxylon; Lower Cretaceous; Patagonia; Baqueró Group.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300005

Heavy metals in contaminated soils: sequential extractions
Provedor de dados: 42
Autores: MARQUES,JANAINA F.; HYPOLITO,RAPHAEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300025

Land use drives change in amazonian tree species
Provedor de dados: 42
Autores: VIEIRA,IMA CÉLIA G.
Abstract: The Amazonian rainforest has been subjected to exceptionally high rates of land use change (LUC), primarily for pasture. We present here an analysis of the impact of LUC on trees from studies made in Pará state. LUC results in drastic declines in native species richness, changes species composition and impacts community resilience and ecosystem services provided by the Amazonian rainforest. Given that secondary forests are expanding in Amazonia we argue that this regrowth forest should be taken into account when planning conservation in this region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon region; Biodiversity; Deforestation; Land use.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600610

Abundance of the reef-building Petaloconchus varians (Gastropoda: Vermetidae) on intertidal rocky shores at Ilha Grande Bay, southeastern Brazil
Provedor de dados: 42
Autores: BREVES,ANDRÉ; SZÉCHY,MARIA TERESA M. DE; LAVRADO,HELENA P.; JUNQUEIRA,ANDREA O.R.
ABSTRACT The reef-building vermetid Petaloconchus varians occurs in the western Atlantic Ocean, from the Caribbean Sea to the southern coast of Brazil. The present study evaluated the abundance of P. varians on intertidal rocky shores in Ilha Grande Bay (Rio de Janeiro State), and characterized their reefs, describing the species density, besides the weight and the belt width of the reefs. Petaloconchus varians reefs were recorded at 25 sites, with rocky shores exposed to different wave action (very sheltered, sheltered, semi-exposed and exposed) and slopes (10° to 46°). Clusters of individuals constructed large reefs along the middle intertidal zone, creating a wide belt (38 cm to 2 m). The density of P. varians and the weight of the reefs ranged from 620...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Molluscs; Rio de Janeiro; Southwestern Atlantic Ocean; Wave exposure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300907

Apoptotic cell and phagocyte interplay: recognition and consequences in different cell systems
Provedor de dados: 42
Autores: Moreira,Maria Elisabete C.; Barcinski,Marcello A.
Cell death by apoptosis is characterized by specific biochemical changes, including the exposure of multiple ligands, expected to tag the dying cell for prompt recognition by phagocytes. In non-pathological conditions, an efficient clearance is assured by the redundant interaction between apoptotic cell ligands and multiple receptor molecules present on the engulfing cell surface. This review concentrates on the molecular interactions operating in mammalian and non-mammalian systems for apoptotic cell recognition, as well as on the consequences of their signaling. Furthermore, some cellular models where the exposure of the phosphatidylserine (PS) phospholipid, a classical hallmark of the apoptotic phenotype, is not followed by cell death will be discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell death; Apoptosis; Apoptotic cell recognition; Apoptotic mimicry; Phagocyte; Intracellular signaling.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100009

Sublethal effect of concentrations of Metarhizium anisopliae (metsch.) sorok on the larval stage and immunologic characteristics of Diatraea flavipennella (box) (lepidoptera: crambidae)
Provedor de dados: 42
Autores: GUIMARÃES,JENNIFER; MARQUES,EDMILSON J.; WANDERLEY-TEIXEIRA,VALÉRIA; ALBUQUERQUE,AURISTELA C. DE; PASSOS,ELIANA M. DOS; SILVA,CÍNTHIA C.M.; TEIXEIRA,ÁLVARO A.C.
This work aimed to evaluate the effects of Metarhizium anisopliae on Diatraea flavipennella and investigate their immune response. Was observed the effect of M. anisopliae against larvae of D. flavipennella sprayed at concentrations of 103, 104, 105 conidia / mL, in which showed differences relative the larval period, extending up to 72.0 days in treatment and 25.0 days in the control. The results for hemocytes revealed that the most frequent cells when sprayed at the concentrations of 103, 105, 107 conidia / mL were the prohemocytes, spherulocytes, plasmatocytes and granulocytes in relation to adipohemocytes and oenocytoids. The level of nitric oxide was different between the control and the concentration 107 spores / mL (24), while the activity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopathogen; Hemocytes; Histochemistry; Nitric oxide; Phenoloxidases; Sugarcane borer.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401973

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics
Provedor de dados: 42
Autores: Paes,Thécia A.S.V.; Rietzler,Arnola C.; Pujoni,Diego G.F.; Maia-Barbosa,Paulina M.
Temperature and light are acknowledged as important factors for hatching of resting eggs. The knowledge of how they affect hatching rates of this type of egg is important for the comprehension of the consequences of warming waters in recolonization of aquatic ecosystems dependent on dormant populations. This study aimed at comparing the influence of different temperature and light conditions on hatching rates of Daphnia ambigua andDaphnia laevis resting eggs from tropical environments. The ephippia were collected in the sediment of three aquatic ecosystems, in southeastern Brazil. For each lake, the resting eggs were exposed to temperatures of 20, 24, 28 and 32 °C, under light (12 h photoperiod) and dark conditions. The results showed that the absence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cladocera; Diapause; Ephippium; Light; Temperature; Tropical aquatic ecosystems.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100179

Biochemical and hematological analysis in acute intermittent porphyria (AIP): a case report
Provedor de dados: 42
Autores: SANTOS,ANNA R.R. DOS; ALBUQUERQUE,RAFAELA R. DE; DORIQUI,MARIA J.R.; COSTA,GRACIOMAR C.; SANTOS,ANA PAULA S.A. DOS.
Acute intermittent porphyria is the most common acute porphyria caused by a decrease in hepatic porphobilinogen deaminase activity, resulting in an accumulation of delta-aminolevulinic acid and porphobilinogen. This disease shows nonspecific signs and symptoms that can be confused with other diseases, thereby making the diagnosis difficult. We report a case of acute intermittent porphyria, reviewing clinical and laboratory aspects, highlighting the hematological and biochemical parameters during and after the crisis. A female patient, aged 28 years, suffered two crises, both presenting gastrointestinal disorders. The second presented neuropsychiatric symptoms. The analysis of hematological and biochemical parameters during the second crisis showed anemia,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute intermittent porphyria; Anemia; C-reactive protein; Hyponatremia.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301207

Identification of the antimicrobial substances produced by Solanum palinacanthum (Solanaceae)
Provedor de dados: 42
Autores: Pereira,Aline C.; Oliveira,Denilson F.; Silva,Geraldo H.; Figueiredo,Henrique C.P.; Cavalheiro,Albero J.; Carvalho,Douglas A.; Souza,Luciana P.; Chalfoun,Sára M.
To find out natural antimicrobial agents as alternative in therapeutics and to preserve food, the methanol extract of Solanum palinacanthum aerial parts was submitted to purification steps guided by antibacterial and antifungal assays. As a consequence, the flavonoid rutin and 3,5-dicaffeoylquinic acid were isolated by column chromatographyand high performance liquid chromatography, and identified by mass and nuclear magnetic resonance spectrometry. Minimal inhibitory concentrations (MIC) of the quinic acid derivative against Aeromonas hydrophila, Bacillus subtilis, Staphylococcus aureus and the fungus Aspergillus ochraceus were 250, 1000, 1000 and &gt; 568µg/mL, respectively. Against the same microorganisms, MIC for rutin were 1000, &gt; 1000, &gt; 1000...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum palinacanthum 3; 5-dicaffeoylquinic acid rutin antimicrobial activity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300004

Periodic complex map germs and foliations
Provedor de dados: 42
Autores: CÂMARA,LEONARDO M.; SCÁRDUA,BRUNO A.
Abstract In this paper we study topological and analytical conditions on the orbits of a germ of diffeomorphism in the complex plane in order to obtain periodicity. In particular, we give a simple proof of a finiteness criteria for groups of analytic diffeomorphisms, stated in Brochero Martínez 2003. As an application, we derive some consequences about the integrability of complex vector fields in dimension three in a neighborhood of a singular point.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Complex germs of diffeomorphims; Singular holomorphic foliations; Integrability of vector fields; Closed orbits.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602563

A new model for describing remission times: the generalized beta-generated Lindley distribution
Provedor de dados: 42
Autores: LIMA,MARIA DO CARMO S.; CORDEIRO,GAUSS M.; NASCIMENTO,ABRAÃO D.C.; SILVA,KÁSSIO F.
New generators are required to define wider distributions for modeling real data in survival analysis. To that end we introduce the four-parameter generalized beta-generated Lindley distribution. It has explicit expressions for the ordinary and incomplete moments, mean deviations, generating and quantile functions. We propose a maximum likelihood procedure to estimate the model parameters, which is assessed through a Monte Carlo simulation study. We also derive an additional estimation scheme by means of least square between percentiles. The usefulness of the proposed distribution to describe remission times of cancer patients is illustrated by means of an application to real data.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GBG generator; Remission times; Extended Lindley model; Quantile function; Lambert function.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401343

Sambucus australis Modulates Inflammatory Response via Inhibition of Nuclear Factor Kappa B (NF-kB) in vitro
Provedor de dados: 42
Autores: CARNEIRO,NORMA V.Q.; SILVA,HUGO B.F. DA; SILVA,RAIMON R. DA; CARNEIRO,TAMIRES C.B.; COSTA,RYAN S.; PIRES,ANAQUE O.; MARQUES,CINTIA R.; VELOZO,EUDES S.; CONCEIÇÃO,ADILVA S.; SILVA,TANIA M.S. DA; SILVA,TELMA M.G. DA; ALCÂNTARA-NEVES,NEUZA M.; FIGUEIREDO,CAMILA A.
Abstract: Medicinal plants have long been used as an alternative to traditional drugs for the treatment of inflammatory conditions due to the classical side effects and restricted access of various commercially available drugs, such as steroids (GCs) and nonsteroidal anti-inflammatory drugs (NSAIDs). Sambucus australis is a Brazilian herb that is commonly used to treat inflammatory diseases; however, few studies have examined the use of this species in the treatment of inflammatory conditions. The present study aims to evaluate the potential anti-inflammatory activity of S. australis in vitro. We established spleen cell cultures stimulated with pokeweed mitogen (PWM) to evaluate the production of proinflammatory cytokines, such as IL-4, IL-5, IFN-y, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sambucus australis; Elderberry; Anti-inflammatory; NF-kB.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100612

An overview of the Leptolepis-like fishes from the Santana Formation, Northeastern Brazil
Provedor de dados: 42
Autores: FIGUEIREDO,FRANCISCO J. DE; GALLO,VALÉRIA.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200016

A note on tensor fields in Hilbert spaces
Provedor de dados: 42
Autores: BILIOTTI,LEONARDO; MERCURI,FRANCESCO; TAUSK,DANIEL V.
We discuss and extend to infinite dimensional Hilbert spaces a well-known tensoriality criterion for linear endomorphisms of the space of smooth vector fields in &lt;IMG SRC="http:/img/fbpe/aabc/v74n2/m1img2.gif"&gt;n.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tensor fields; Hilbert spaces.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200003

Fluoride characterization by principal component analysis in the hydrochemical facies of Serra Geral Aquifer System in Southern Brazil
Provedor de dados: 42
Autores: Nanni,Arthur; Roisenberg,Ari; Fachel,Jandyra M.G.; Mesquita,Gilberto; Danieli,Cristiano.
Principal component analysis is applied to 309 groundwater chemical data information from wells in the Serra Geral Aquifer System. Correlations among seven hydrochemical parameters are statistically examined. A four-component model is suggested and explains 81% of total variance. Component 1 represents calcium-magnesium bicarbonated groundwaters with long time of residence. Component 2 represents sulfated and chlorinated calcium and sodium groundwaters; Component 3 represents sodium bicarbonated groundwaters; and Component 4 is characterized by sodium sulfated with high fluoride facies. The components' spatial distribution shows high fluoride concentration along analyzed tectonic fault system and aligned on northeast direction in other areas, suggesting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fractured aquifer; Geostatistics; GIS; Groundwater; Hydrogeology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400010

Use of fishing resources by women in the Mamanguape River Estuary, Paraíba state, Brazil
Provedor de dados: 42
Autores: Rocha,Michelle S.P.; Santiago,Idalina M.F.L.; Cortez,Creuza S.; Trindade,Priscila M.; Mourão,José S.
We evaluated the appropriation and use of fishing resources by women residing near the Mamanguape River Estuary (MRE), Paraíba state, Brazil. Were used combinations of qualitative (interviews and direct observations) and quantitative methods (use value and corrected principal use concordance). Thirty women were interviewed and reported the use of 41 species (30 fish, 8 crustaceans, and 3 mollusks), mainly for local consumption and sale. The species with the highest use value were Genidens genidens (0.7), Callinectes exasperatus (0.73) and Anomalocardia brasiliana (0.46). The diversity of resources exploited demonstrates the importance of the mangrove ecosystem to MRE families, and the data gathered can serve as a basis for formulating public policies to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fisher; Fishing resources; Mangrove; Mamanguape River Estuary.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400032

Pterobothrium crassicolle parasitizing Paralichthys orbignyanus (Osteichthyes, Paralichthyidae) in Brazil
Provedor de dados: 42
Autores: FELIZARDO,NILZA N.; KNOFF,MARCELO; DINIZ,JESSICA B.; TORRES,EDUARDO J.L.; CALIXTO,FLÁVIA A.A.; CLEMENTE,SÉRGIO C. SÃO.
ABSTRACT From September 2014 to November 2015, 30 Paralichthys orbignyanus specimens were obtained from Sepetiba Bay in the municipality of Rio de Janeiro, State of Rio de Janeiro, Brazil. The fishes were necropsied and cestode larvae were recovered from the abdominal cavity, mesentery, and serosas of the stomach, intestine, spleen, liver, kidney and gonads. Nineteen fish were parasitized by a total of 90 trypanorhynch plerocerci. Based on morphological characters, these were identified as Pterobothrium crassicolle. The parasitism indices for P. crassicolle on P. orbignyanus, were 63.3% for prevalence, 4.7 for mean intensity, 3 for mean abundance and 1 to 18 for range of infection. These parasites were studied due to their importance during fish sanitary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paralichthys orbignyanus; Seafood safety; Trypanorhyncha; Brazil.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401605

Essential oil from two populations of Echinodorus grandiflorus (Cham. &amp;amp; Schltdl.) Micheli (Chapéu de couro)
Provedor de dados: 42
Autores: Pimenta,Daniel S.; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Analysis by Gas Chromatography and Gas Chromatography/Mass Spectrometry of the essential oils obtained from leaves of Echinodorus grandiflorus ("Chapéu de couro") from two different populations (Big Leaves and Small Leaves), collected monthly between September 1998 and December 1999 revealed 17 components. Phytol was the major constituent for both populations. The main sesquiterpene representatives are (E)-caryophyllene, alpha-humulene and (E)-nerolidol.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Echinodorus grandiflorus; Alismataceae; Essential oil; Sesquiterpenes; Diterpenes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400002

Selective degeneration of photoreceptors in retinal tissue in vitro: a new experimental model for retinitis pigmentosa
Provedor de dados: 42
Autores: LINDEN,RAFAEL; FREITAS,FABIOLA G. DE; LEAL-FERREIRA,MONA L.; CHIARINI,LUCIANA B.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300023

Charcoal remains from a tonstein layer in the Faxinal Coalfield, Lower Permian, southern Paraná Basin, Brazil
Provedor de dados: 42
Autores: Jasper,André; Uhl,Dieter; Guerra-Sommer,Margot; Abu Hamad,Abdalla M. B; Machado,Neli T. G.
Fossil charcoal has been discovered in the Faxinal Coalfield, Early Permian, Rio Bonito Formation, in the southernmost portion of the Paraná Basin, Brazil. Three types of pycnoxylic gymnosperm woods recovered from a single tonstein layer are described and confirm the occurrence of paleowildfire in this area. A decrease of the charcoal concentration from the base to the top within the tonstein layer indicates that the amount of fuel declined during the deposition probably due to the consumption of vegetation by the fire. The presence of inertinite in coals overlying and underlying the tonstein layer indicates that fire-events were not restricted to the ash fall interval. The integration of the new data presented in the current study with previously...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charcoal; Gymnosperms; Volcanic ashes; Coal deposits; Gondwana; Late Palaeozoic.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200009

Oxygen isotopes internal equilibrium in magmatic epidote-bearing granitoids
Provedor de dados: 42
Autores: FERREIRA,VALDEREZ P.; VALLEY,JOHN W.; SIAL,ALCIDES N.; SPICUZZA,MICHAEL J.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300043

Psychometric analysis of the Tourism Wellbeing Scale (TWS): a multidisciplinary approach
Provedor de dados: 42
Autores: GARCÊS,SORAIA; POCINHO,MARGARINA; JESUS,SAÚL N. DE.
Abstract  This paper analyses the Tourism Wellbeing Scale, a new measure in the tourism sector built from Positive Psychology variables: wellbeing, creativity, optimism, and spirituality. It empathizes the importance of multidisciplinary work and thus it focuses on a psychological approach to understand wellbeing in tourism. The empirical research used Exploratory Factor Analysis (n=429) and Confirmatory Factor Analysis (n=428). Reliability through Cronbach’ Alpha was .874 and evidence of convergent validity was found with the Creative personality scale-short form, Global wellbeing scale, optimism scale, and spirituality scale. A final 8-item structure, with a one-factor solution and confirmatory analysis with: a) Normed Chi-squared (χ2/df) =1.076; b) Root...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Positive Psychology; Tourism; Tourism Wellbeing Scale; Wellbeing.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101206

Balanced cytokine-producing pattern in mice immunized with an avirulent Trypanosoma cruzi
Provedor de dados: 42
Autores: Soares,Milena B. P.; Gonçalves,Renata; Pyrrho,Alexandre S.; Costa,Deise A.; Paiva,Claudia N.; Gattass,Cerli R.
We have previously demonstrated that inoculation of BALB/c mice with trypomastigotes of CL-14, an avirulent Trypanosoma cruzi clone, prevents the development of parasitemia and mortality after challenge with virulent CL strain. In this report, we investigated the cytokine and antibody profiles induced by inoculation with CL-14 clone. Groups of mice were inoculated with trypomastigotes of CL-14 clone and challenged with infective CL strain. Challenged CL-14-inoculated mice had lower levels of IFN-&lt;FONT FACE=Symbol&gt;g&lt;/font&gt; and higher production of IgG1 antibodies as compared to CL strain-infected mice. Previous inoculation with CL-14 clone partially prevented the suppression of IL-2 production caused by CL strain infection. No significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Protection; Cytokines; Humoral response.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200005

Optimal condition of cannabis maceration to obtain the high cannabidiol and Δ9-tetrahydrocannabinol content
Provedor de dados: 42
Autores: MONTON,CHAOWALIT; MADAKA,FAMEERA; SETTHARAKSA,SUKANYA; WUNNAKUP,THANIYA; SUKSAEREE,JIRAPORNCHAI; SONGSAK,THANAPAT.
Abstract: The aim of this work was to optimize a maceration condition of cannabis (Cannabis sativa L.). A circumscribed central composite experimental design was applied in this work. Temperature and time were varied from 40-80 °C and 30-90 min, respectively. The three responses (i.e., extraction yield, cannabidiol content, and Δ9- tetrahydrocannabinol content) were predicted by computer software. The yield was high when cannabis was macerated using ethanol at high temperature and long duration time. While cannabidiol and Δ9- tetrahydrocannabinol content was high when macerating at a low heating temperature and short duration time. The optimal condition provided the simultaneous high of cannabidiol and Δ9- tetrahydrocannabinol content was 40 °C for 30 min....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cannabis sativa; Cannabidiol; Δ9-tetrahydrocannabinol; Optimization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500809

Experimental validation of a bearing wear model using the directional response of the rotor-bearing system
Provedor de dados: 42
Autores: Machado,Tiago Henrique; Cavalca,Katia L.
ABSTRACT The present work gives continuity in the analysis of the wear influence on cylindrical hydrodynamic bearings by presenting an experimental validation of the wear model previously proposed by the authors. This validation is carried on using the frequency response of the rotor-bearings system in directional coordinates. For this purpose, a test rig was assembled in order to evaluate the behavior of the rotating system when supported by hydrodynamic bearings with different wear patterns. The experimental measurements are used to validate the wear model, comparing the anisotropy influence on the experimental and numerical responses. The simulated directional frequency responses showed a good agreement with the experimental ones, demonstrating the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrodynamic bearing; Wear model; Experimental validation; Directional frequency response.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602401

A hybrid swarm of manatees along the Guianas coastline, a peculiar environment under the influence of the Amazon River plume
Provedor de dados: 42
Autores: LIMA,CAMILLA S.; MAGALHÃES,RAFAEL F.; MARMONTEL,MIRIAM; MEIRELLES,ANA CAROLINA; CARVALHO,VITOR LUZ; LAVERGNE,ANNE; THOISY,BENOIT DE; SANTOS,FABRÍCIO R.
Abstract: The West Indian (Trichechus manatus) and Amazonian (T. inunguis) manatees have a sympatric occurrence at the mouth of the Amazon River. A result of this interspecific encounter is the occurrence of hybrids, which are frequently found along the coasts of Amapá state in Brazil, French Guiana and Guyana. Here we present new genetic evidence indicating the occurrence of a hybrid swarm along the Guianas Shield coastline, which is an interspecific hybrid zone that also separates T. manatus populations located east (Brazil) and west (Caribbean, Gulf of Mexico, Florida and Antilles). In addition, we suggest that this hybrid population occupies a peculiar mangrove-rich environment under strong influence of the Amazon River plume, which requires an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation Genetics; Hybrid zone; Introgression; Amazon River plume; Guianas coastline; Trichechus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600615

A new species of Stethelmis Hinton (Coleoptera: Elmidae) from Argentina and description of its larva
Provedor de dados: 42
Autores: MARTÍNEZ-ROMÁN,NICOLÁS RAFAEL; MANZO,VERÓNICA; ARCHANGELSKY,MIGUEL.
Abstract: A new species of Stethelmis, S. shepardi sp. nov., is described for Patagonia, Argentina from adults of both sexes. A full description and illustrations of both the adult and the larva of the new species are provided with comments on its habitat and distribution. Adults of the new species are compared with those of S. kaszabi (Hinton 1970) and S. chilensis (Hinton 1945). The larva of S. shepardi is compared with that of S. kaszabi, the other Stethelmis larva described. We also describe and illustrate for the first time the male genitalia of S. kaszabi. A key to the known species of Stethelmis is also included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elminae; Neotropical; Patagonia; Riffle beetles; Stethelmis shepardi.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700606

Thermodynamic bounds for existence of normal shock in compressible fluid flow in pipes
Provedor de dados: 42
Autores: COLLE,SERGIO.
Abstract The present paper is concerned with the thermodynamic theory of the normal shock in compressible fluid flow in pipes, in the lights of the pioneering works of Lord Rayleigh and G. Fanno. The theory of normal shock in pipes is currently presented in terms of the Rayleigh and Fanno curves, which are shown to cross each other in two points, one corresponding to a subsonic flow and the other corresponding to a supersonic flow. It is proposed in this paper a novel differential identity, which relates the energy flux density, the linear momentum flux density, and the entropy, for constant mass flow density. The identity so obtained is used to establish a theorem, which shows that Rayleigh and Fanno curves become tangent to each other at a single sonic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Normal shocks in pipes; Compressible fluid flow; Gas dynamics; Second Law analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301313

Reproductive success of South American terns (Sterna hirundinacea) from Cardos Islands, Florianópolis, SC, Brazil
Provedor de dados: 42
Autores: Fracasso,Hélio A.A.; Branco,Joaquim O.
Sterna hirundinacea (Lesson, 1831) is a migratory seabird that breeds in the Pacific Coast (from Peru to Chile) and along the Atlantic coast of South America from Espírito Santo (Brazil) to Terra del Fuego (Argentina). This paper describes the reproductive success of South American Terns on Cardos Island, Florianopolis, Brazil in the breeding seasons of 2003, 2005 and 2006. The colony was formed in mid-May in 2003 and early April in other years, with the total number of nests ranging from 1,852 in 2006 to 2,486 in 2005. Hatching success was estimated at 76.39% in 2006, 62.73% in 2003 and 41.1% in 2005, the lowest value that could be attributed to predation by hawks Caracara plancus, lizards Tupinambis merianae and black vulture Coragyps atratus. The chicks...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding; Reproductive success; South American Terns; Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200021

Light environment influences the flood tolerance in Cordia americana (L.) Gottschling &amp;amp; J.S.Mill.
Provedor de dados: 42
Autores: SAMOJEDEN,CAROLINE G.; ARTUSI,ÁGHATA C.; DELEVATTI,HELIUR A.A.; MILESI,SILVIA V.; CANSIAN,ROGÉRIO L.; KISSMANN,CAMILA; SAUSEN,TANISE L.
Abstract The subtropical riverine forests present a variation in soil water availability throughout the year, following precipitation seasonality. The objective of this work was to evaluate the responses of Cordia americana to different light intensities combined with soil flooding. Seedlings were acclimated to light treatments, with full sun and shade conditions. Sun and shade plants were subjected to soil flooding during periods of 10 (short) and 30 (longer) days. After 10 days, flooded plants had a higher root dry mass accumulation and soluble sugars content, regardless of the light condition. Shade plants presented higher shoot soluble sugars content in relation to the sun plants. After 30 days, a higher shoot soluble sugar content was observed in sun...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subtropical climate; Soluble sugars; Understory; Water stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602945

Oxidative stress responses of juvenile tambaqui Colossoma macropomum after short-term anesthesia with benzocaine and MS-222
Provedor de dados: 42
Autores: STRINGHETTA,GIOVANNA R.; BARBAS,LUIS A.L.; MALTEZ,LUCAS C.; SAMPAIO,LUÍS A.; MONSERRAT,JOSÉ M.; GARCIA,LUCIANO O.
ABSTRACT The present study aimed to evaluate the effects of benzocaine and tricaine methanesulfonate on oxidative stress parameters of juvenile tambaqui tissues. Fish (n=80) were anesthetized with benzocaine (100 mg L-1) or tricaine (240 mg L-1) and two control groups were used (non-anesthetized fish and fish exposed to ethanol-only). After anesthetic induction 10 fish/anesthetic were euthanized after 3, 12 and 24 hours post-anesthesia and tissue samplings (gills, liver and brain) were performed. Samples were submitted to analyses of enzyme activity glutathione-S-transferase (GST), cellular lipid peroxidation (TBARS) and total antioxidant capacity (ACAP). ACAP increased in gills of benzocaine treatment after 12 hours. The liver showed a reduction in ACAP...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthetics; Fish; GST; Lipid peroxidation; Total antioxidant capacity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502209

A simplified table for staging embryos of the pipid frog  Pipa arrabali
Provedor de dados: 42
Autores: ARAÚJO,OLÍVIA G.S.; HADDAD,CÉLIO F.B.; SILVA,HÉLIO R. DA; PUGENER,LOURDES A.
ABSTRACT Pipa is a Neotropical genus of frogs that dwell in freshwater environments. It includes four species that lack free-swimming larvae (P. aspera, P. arrabali, P. pipa, and P. snethlageae) and three with tadpoles (P. carvalhoi, P. myersi, and P. parva). Developmental tables such as the one proposed by Nieuwkoop and Faber might be useful for Pipa species with tadpoles. However, for the other Pipa species, to determine stages by this table or by any of the tables already prepared for frogs without tadpoles (e.g., Crinia nimbus, Eleutherodactylus coqui, and Oreobates barituensis) is impossible. By using embryonic, juvenile, and subadult specimens, we generated a staging table for P. arrabali, from the moment limb buds were first observed until birth,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Anura; Development; Morphology; Pipidae.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501875

Angolatitan adamastor, a new sauropod dinosaur and the first record from Angola
Provedor de dados: 42
Autores: Mateus,Octávio; Jacobs,Louis L.; Schulp,Anne S.; Polcyn,Michael J.; Tavares,Tatiana S.; Buta Neto,André; Morais,Maria Luísa; Antunes,Miguel T.
A forelimb of a new sauropod dinosaur (Angolatitan adamastor n. gen. et sp.) from the Late Turonian of Iembe (Bengo Province) represents the first dinosaur discovery in Angola, and is one of the few occurrences of sauropod dinosaurs in sub-Saharan Africa collected with good chronological controls. The marginal marine sediments yielding the specimen are reported to be late Turonian in age and, thus it represents a non-titanosaurian sauropod in sub-Saharan Africa at a time taken to be dominated by titanosaurian forms. Moreover, Angolatitan adamastor is the only basal Somphospondyli known in the Late Cretaceous which implies in the existence of relict forms in Africa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angola; Cretaceous; Turonian; Dinosaurs; Sauropoda; Angolatitan.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100012

Changes in microplanktonic protists assemblages promoted by the thermocline induced stratification around an oceanic archipelago
Provedor de dados: 42
Autores: COSTA,ALEJANDRO E.S.F. DA; SANTANA,JANA R. DE; NEUMANN-LEITÃO,SIGRID.
Abstract In the area around the archipelago of São Pedro e São Paulo (ASPSP), a set of small rocky islands in the Equatorial Atlantic, the thermocline begins at a more superficial depth than in the surrounding waters. This raises the question if there is any change in heterotrophic microplanktonic protists assemblages occurring in the surface mixed layer and in the subsurface layer. To answer this question, we sampled seawater in seven depths (between 1-100 m) with a 10L Niskin bottle and obtained temperature and salinity profiles with a CTD at eight sites around the ASPSP. The depth of the surface mixed layer varied between 18-63 meters. Dinoflagellates dominated in terms of abundance representing over 80% and 65% of the individuals found in the surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinoflagellates; Ecological indicators; Polycystine radiolarians; Tintinnid ciliates; Tropical oceans; Vertical distribution.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502249

Morpho-anatomy and ontogeny of the underground system of Chrysolaena simplex (Less.) Dematt. (Asteraceae)
Provedor de dados: 42
Autores: Santos,Vanessa S.; Souza,Vinicius P.; Vilhalva,Divina A.A.; Ferreira,Fernanda P.S.; Paula,José R.; Rezende,Maria Helena.
The occurrence of thickened underground systems in Asteraceae is widely reported in the literature. Given the great complexity of underground systems, which may originate from roots, stems, or both, morpho-anatomical analyses are essential to ensure the use of correct terminology. The goals of this study were to describe the morpho-anatomy and ontogeny, investigate the occurrence of secondary metabolites and evaluate the effects of seasonality on the underground system of Chrysolaena simplex (Less.) Dematt. Samples were studied using standard protocols of plant anatomy, scanning electron microscopy, histochemical and phytochemical. The underground system of C. simplex was categorised as a rhizophore which started from cotyledonary node. In adult...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bud; Cerrado; Fructan; Phytochemical; Rhizophore; Secretory ducts.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100269

Essential oil of Mitracarpus frigidus as a potent source of bioactive compounds
Provedor de dados: 42
Autores: Fabri,Rodrigo L.; Coimbra,Elaine S.; Almeida,Ana C.; Siqueira,Ezequias P.; Alves,Tânia M.A.; Zani,Carlos L.; Scio,Elita.
In our previous work (Fabri et al. 2009), we showed that different extracts of Mitracarpus frigidus had significant antibacterial, antifungal and leishmanicidal activities. In order to increase our knowledge about this species, this work assesses the chemical composition and the in vitro biological activity of its essential oil. Thus, the essential oil obtained by hydrodistillation of the aerial parts of M. frigidus was analyzed by GC/MS. Among several compounds detected, 11 were identified, being linalool and eugenol acetate the major components. The essential oil exhibited a moderate antibacterial effect against Staphyloccocus aureus, Bacillus cereus, Pseudomonas aeruginosa and Enterobacter cloacae (MIC 250 µg/mL). On the other hand, it showed a strong...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitracarpus frigidus; Essential oil; Antimicrobial; Antileishmanial; Cytotoxicity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400021

Morpho-anatomical, physiological and biochemical changes in rubber tree seeds
Provedor de dados: 42
Autores: SOUZA,GENAINA A. DE; DIAS,DENISE C.F.S.; PIMENTA,THALINE M.; CARDOSO,AMANDA Á.; PIRES,RAQUEL M.O.; ALVARENGA,ANTÔNIO P.; PÍCOLI,EDGARD A.T.
ABSTRACT The physical, physiological and biochemical changes during the development until the dispersal of rubber tree seeds were evaluated with the purpose of estimating the point at physiological maturity. A total of 30 plants were selected at different points in a commercial planting area and had their flowers marked during the anthesis and every 15 days after marking. Fruits and seeds were collected for analysis of moisture content, dry matter, diameter and length. Details of the anatomy ultra-structure of the seeds were evaluated. The seed emergence, emergency speed index, heat resistant proteins and oxidative stress enzymes were examined. It was observed that fruits reached maximum size at 120 days after anthesis and seeds at 150 days. The seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Oxidative stress enzymes; Physiological maturity; Seeds development.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401625

Isoenzyme and molecular approach for authenticating and monitoring of animal cell lines
Provedor de dados: 42
Autores: ARAÚJO,SHIRLEY B. DE; PATRICIO,GIANCARLO F.; SIMONI,ISABELA C.; RIVAS,ELIANA B.; FERNANDES,MARIA JUDITE B.
Abstract: Authentication of cell lines is of paramount importance to validate the results from their use in biomedical research. Although isoenzyme polymorphism is the standard method, molecular methods based on mitochondrial DNA (mtDNA) have been developed to replace it. The aim of this study was the improvement of our isoenzyme electrophoretic analysis and the validation of one molecular technique targeted at mtDNA for the authentication of our animal cell lines. The combined method of cellular lysing through osmotic shock, followed by freezing-thawing in N2 to obtain isoenzyme extracts, and with 42 × 106 cells maintained the best efficiency. The superior electrophoretic conditions were PAGE run at 200 V. All cell lines had isoenzymatic mobility...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Authentication; Cell line; DNA barcode; Isoenzyme.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500625

Shoot and root interference of morning glory on the initial growth of sugarcane
Provedor de dados: 42
Autores: ALVES,FELIPE C.; BIANCO,SILVANO; NEPOMUCENO,MARILUCE P.; MARTINS,JOSÉ VALCIR F.; ALVES,PEDRO LUÍS C.A.
ABSTRACT Among weeds, morning glories comprise a very important group of climbing plants that infest sugarcane crops. The objective of this study was to evaluate the shoot and root interference of Merremia cissoides on the initial growth of sugarcane cultivar RB 966928. The experiment consisted of five treatment groups: (i) sugarcane monocropping, (ii) morning glory monocropping, (iii) sugarcane intertwined with morning glory but inseparate boxes, (iv) sugarcane intertwined with morning glory in attached boxes and (v) sugarcane with morning glory in attached boxes with morning glory prevented from intertwining with the sugarcane. The experimental design consisted of randomized blocks with four replicates. Merremia cissoides adversely affected the initial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Merremia cissoides; Competition; Saccharum; Methodology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100521

Response of duck breeders to dietary L-Carnitine supplementation during summer season
Provedor de dados: 42
Autores: RIZK,YASSER S.; FAHIM,HANY N.; BESHARA,MALAK M.; MAHROSE,KHALID M.; AWAD,AWAD L.
Abstract: A total number of 300 (225 ducks and 75 drakes) Sudani ducks, 28-wk-old were divided into five groups to investigate the effects of dietary L-carnitine (LC) supplementation on productive, hatching and physiological performance as well as nutrients digestibility coefficients. The results indicated that the productive performance and Semen quality parameters (ejaculate volume, sperms concentration and advanced motility) were significantly improved by LC supplementation (150-450 mg /kg diet) as compared to the control. Hatchability of fertile eggs (%) was significantly improved, while total embryonic mortality was significantly decreased by supplementing 300 and 450 mg LC/kg diet. Supplementing different dietary LC levels resulted in significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Duck breeders; Hatchability; Laying performance; L-carnitine; Semen.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700601

Variation of MODIS reflectance and vegetation indices with viewing geometry and soybean development
Provedor de dados: 42
Autores: Breunig,Fábio M.; Galvão,Lênio S.; Formaggio,Antônio R.; Epiphanio,José C.N.
Directional effects introduce a variability in reflectance and vegetation index determination, especially when large field-of-view sensors are used (e.g., Moderate Resolution Imaging Spectroradiometer - MODIS). In this study, we evaluated directional effects on MODIS reflectance and four vegetation indices (Normalized Difference Vegetation Index - NDVI; Enhanced Vegetation Index - EVI; Normalized Difference Water Index - NDWI1640 and NDWI2120) with the soybean development in two growing seasons (2004-2005 and 2005-2006). To keep the reproductive stage for a given cultivar as a constant factor while varying viewing geometry, pairs of images obtained in close dates and opposite view angles were analyzed. By using a non-parametric statistics with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NDWI; EVI; NDVI; Remote sensing; Directional effects.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200004

Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes
Provedor de dados: 42
Autores: MOLINA,WAGNER F.; MARTINEZ,PABLO A.; BERTOLLO,LUIZ A.C.; BIDAU,CLAUDIO J.
Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The mosaic of trends acting at an infra-familiar level in fish could be explained as the interaction of the directional process of meiotic drive as background, modulated on a smaller scale by adaptive factors or specific karyotypic properties of each group, as proposed for the orthoselection model.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinopterygii; B chromosomes; Centromeric drive; Chromosome evolution; Sex chromosomes.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401801

How to live and do science in a changing world
Provedor de dados: 42
Autores: ANDREOTE,FERNANDO DINI.
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100001

Accuracy of linear measurements performed with two imaging software in cone-beam computed tomography scans of dry human mandibles
Provedor de dados: 42
Autores: SILVA,ALESSANDRO A.L.S.; FRANCO,ADEMIR; FERNANDES,ÂNGELA; COSTA,CLAUDIO; BARBOSA,JORGE S.; WESTPHALEN,FERNANDO H.
ABSTRACT The present study aimed to assess the accuracy of linear measurements performed with two software packages in multislice (MSCT) and cone beam (CBCT) computed tomography (CT) images. The sample consisted of 10 human mandibles marked standardly 8 times with metallic orthodontic wires. The mandibles underwent both MSCT and CBCT scanning and were measured linearly and digitally with two software packages, namely Studio 3.1® (Anne Solutions®, SP, Brazil) (ST) and Implant Viewer 2.817® (Anne Solutions®, SP, Brazil) (IV). The linear measurements were the mandibular height (MH) and width (MW), and the distance from the alveolar ridge to the mandibular canal (AC). To validate the measurements, the mandibles were sectioned in the marked regions and measured...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Computed tomography; Dental implant; Morphology; Radiology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602865

A quantitative method to establish the clinical evolution of HIV infected patients and the reproductive biology of an echinoid species from Brazil
Provedor de dados: 42
Autores: Kellner,Alexander W. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100001

Constitution of ethnozoological semantic domains: meaning and inclusiveness of the lexeme "insect" for the inhabitants of the county of Pedra Branca, Bahia State, Brazil
Provedor de dados: 42
Autores: Santos-Fita,Dídac; Costa-Neto,Eraldo M; Schiavetti,Alexandre.
This article deals with the sociocultural construction of the 'insect' and 'animal' domains by the inhabitants of the county of Pedra Branca (municipality of Santa Terezinha, Bahia State, Brazil). The fieldwork was performed from September 2006 to July 2007. The data was obtained by means of open-ended interviews of 74 individuals of both genders whose ages ranged from 4 to 89 years old. The results show that the interviewees were unable to say in an accurate and secure way a specific definition for each domain. Depending on how a given animal is culturally interpreted, it could belong to the semantic domain 'animal' or 'insect', being representative of one or another group. However, in practice, such a distinction between these two semantic domains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cognition; Ethnotaxonomy; Ethnozoology; Semantics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200018

Comments to Angulo et al. 2016 on “Sea-level fluctuations and coastal evolution in the state of Rio de Janeiro, southeastern - Brazil” by Castro et al. 2014
Provedor de dados: 42
Autores: CASTRO,JOÃO WAGNER A.; SEOANE,JOSÉ C.S.; CUNHA,ALINE M. DA; MALTA,JULIA V.; OLIVEIRA,CAMILA A. DE; VAZ,STELLA R.; SUGUIO,KENITIRO.
ABSTRACT Interpretation of sea-level indicators is essential when studying paleo sea-level fluctuations during the Holocene. Sea-level indicators may have different origins, such as geological (beachrocks) and biological (vermetids and barnacles). In order to reconstruct paleo sea-level, it is necessary to attribute an indicative meaning to each sea-level indicator. This paper aims to discuss issues raised by Angulo et al. (2016) regarding to the sea-level fluctuations curve proposed by Castro et al. (2014) to the Rio de Janeiro State coast, Brazilian southeast. The key issue that deserves posing is that local or regional curves cannot be built based on large scale (global) RSL geophysical models even in places of steady crust like Brazil. Here, we put...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleo sea-level; Geological and biological indicators; Sea-level fluctuations curve; RSL vertical variation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401369

Reproductive biology of Thamnodynastes hypoconia (Serpentes: Dipsadidae) in Brazilian subtemperate wetlands
Provedor de dados: 42
Autores: REBELATO,MARLUCI M.; PONTES,GLÁUCIA M.F.; TOZETTI,ALEXANDRO M.
ABSTRACT This study aimed to describe the reproductive biology of populations of Thamnodynastes hypoconia in subtemperate wetlands based on macroscopic analyses of their gonads. We analyzed 101 specimens from the southernmost regions of Brazil. The males had a greater snout-vent length, but the females reached sexual maturity with a greater body size. The reproductive cycle of the females was seasonal, with secondary vitellogenesis occurring between the winter and spring (May-October). Based on macroscopic analysis of gonads, data suggests that males have a continuous reproductive cycle. Parturition occurs between the late summer and early fall (January-April). The clutch size ranged between 4 and 16 embryos and showed no relationship with the female's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Pampa; Reproductive cycle; Sexual maturity; Snakes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501699

Histological features, starch accumulation and sprouting in the early root development of Jacaranda ulei(Bignoniaceae)
Provedor de dados: 42
Autores: SILVA,PAULO R.D. DA; STEFENON,VALDIR M.
The plant species occurring in the savanna region of the Cerrado biome in Brazil present typical morphological and physiological adaptations to a dry climate with seasonal occurrence of wildfires. In this study, the histological features of the root system, the main sites of synthesis and storage of starch and the initial phases of the bud development were characterized inJacaranda ulei. The anatomical features observed in the root system of J. ulei are related to the needs of the species to survive in the Cerrado. The histochemical analyses demonstrated high synthesis of glucose and glycoprotein after the third day of in vitro culture, in the proximal cells of the cortical parenchyma of the exoderm. Meristematic primordia were observed in the ninth day...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado Biome; Histology; Savanna; Wildfire.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100271

Detrital carbonate sedimentation of the Rocas Atoll, South Atlantic
Provedor de dados: 42
Autores: PEREIRA,NATAN S.; MANSO,VALDIR A.V.; MACEDO,RENÊ J.A.; DIAS,JOÃO M.A.; SILVA,ADRIANA M.C.
Located 266 km offshore Brazilian coast, Rocas Reef complex is the only atoll in the South Atlantic. Two scientific expeditions carried out detailed sedimentological studies of the complex. Sand texture was dominant in the sedimentary environment, although other textures such as gravel, sandy gravel and gravelly sand, were also observed. Mean size ranged from fine sand to coarse sand (-1.23 to 2.34ø), with an average value of 0.69ø (sand fraction), which from a geological perspective represents a high-energy environment. The values of mean size varied in the different geomorphologic compartments, a response to variable hydrodynamics on the reef. Sorting ranged from very well sorted to poorly sorted, with a mean value of 0.97ø (moderately sorted). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogenic particles; Carbonate sediments; Atoll reef; Sedimentological parameters.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100057

Patterns of sediment dispersion coastwise the State of Bahia - Brazil
Provedor de dados: 42
Autores: BITTENCOURT,ABÍLIO CARLOS DA SILVA PINTO; DOMINGUEZ,JOSÉ MARIA LANDIM; MARTIN,LOUIS; SILVA,IRACEMA REIMÃO.
Using the average directions of the main wave-fronts which approach the coast of Bahia State - coinciding with that of the main wind occurring in the area - and of their periods, we define a wave climate model based on the construction of refraction diagrams. The resulting model of sediment transport was able to reproduce, in a general way, the sediment dispersion patterns furnished by geomorphic indicators of the littoral drift. These dispersion patterns control the generation of different types of sediment accumulations and of coastal stretches under erosion. We demonstrate that the presence of the Abrolhos and Corumbaú Point coral reefs is an important factor controlling the sediment dispersion patterns, since them act as a large protection against the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Littoral drift; Wave refraction; Numerical modelling; State of Bahia; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200012

15N-labed glycine synthesis
Provedor de dados: 42
Autores: Tavares,Claudinéia R.O.; Bendassolli,José A.; Coelho,Fernando; Sant'ana Filho,Carlos R.; Prestes,Clelber V.
This work describes a method for 15N-isotope-labeled glycine synthesis, as well as details about a recovery line for nitrogen residues. To that effect, amination of alpha-haloacids was performed, using carboxylic chloroacetic acid and labeled aqueous ammonia (15NH3). Special care was taken to avoid possible 15NH3 losses, since its production cost is high. In that respect, although the purchase cost of the 13N-labeled compound (radioactive) is lower, the stable tracer produced constitutes an important tool for N cycling studies in living organisms, also minimizing labor and environmental hazards, as well as time limitation problems in field studies. The tests were carried out with three replications, and variable 15NH3(aq) volumes in the reaction were used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stable isotope; Glycine; Amino acid.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300005

Scutia buxifolia Reissek essential oil: in vitro antioxidant and antimicrobial activities
Provedor de dados: 42
Autores: BOLIGON,ALINE A.; PIANA,MARIANA; BRUM,THIELE F. DE; FROEDER,AMANDA L.F.; BELKE,BIANCA V.; SCHWANZ,THIAGO G.; MARIO,DÉBORA N.; ALVES,SYDNEY H.; ATHAYDE,MARGARETH L.
The volatile oil from the stem bark of Scutia buxifolia (Rhamnaceae) has been obtained by hydrodistillation and analyzed by GC-MS. Twenty-one components were identified representing 99.93 % of the total oil composition, spathulenol (35.87%), β-cubebene (17.26%), germacrene D (6.43%), linalool (5.19%), carvacrol (4.05%) were the main components of S. buxifolia essential oil. Antioxidant and antimicrobial properties of the essential oil were evaluated by free radical scavenging (DPPH) assay and micro broth dilution method, respectively. S. buxifolia essential oil presented interesting radical scavenging activity (IC50 = 15.03 ± 0.11 µg/mL). The antibacterial assay showed that S. buxifolia stem bark essential oil was moderately active against the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scutia buxifolia; Essential oil; Antioxidant; Antimicrobial.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301463

Dietary iron chelate for sows and effects on iron supplementation in piglets
Provedor de dados: 42
Autores: BARROS,CARINE A.; PASCOAL,LEONARDO A.F.; WATANABE,PEDRO H.; MARTINS,TEREZINHA D.D.; ANDRADE,TIAGO S.; RIBEIRO,JOSÉ E.S.
Abstract: In order to evaluate iron chelate in diets for sows during gestation and lactation and its effects on iron supplementation for piglets, a total of 50 pregnant sows in the third parity order were distributed according to a randomized block design with two treatments: diet without iron chelate supplementation (n=20); diet supplemented with 0.15% of iron chelate (n=30). The litters of sows were distributed into five different treatments: sows without iron chelate supplementation and piglets receiving intramuscular iron-dextran; sows without iron chelate supplementation and piglets receiving oral iron supplementation; sows supplemented with iron chelate and piglets receiving intramuscular iron-dextran; sows supplemented with iron chelate and piglets...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anemia; Iron-dextran; Iron-chelate; Organic mineral.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700852

A structural perspective on the mechanisms of quorum sensing activation in bacteria
Provedor de dados: 42
Autores: LIXA,CAROLINA; MUJO,AMANDA; ANOBOM,CRISTIANE D.; PINHEIRO,ANDERSON S.
Bacteria are able to synchronize the population behavior in order to regulate gene expression through a cell-to-cell communication mechanism called quorum sensing. This phenomenon involves the production, detection and the response to extracellular signaling molecules named autoinducers, which directly or indirectly regulate gene expression in a cell density-dependent manner. Quorum sensing may control a wide range of biological processes in bacteria, such as bioluminescence, virulence factor production, biofilm formation and antibiotic resistance. The autoinducers are recognized by specific receptors that can either be membrane-bound histidine kinase receptors, which work by activating cognate cytoplasmic response regulators, or cytoplasmic receptors...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autoinducer; Bacteria; Quorum sensing; Receptor; Structure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502189

Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil
Provedor de dados: 42
Autores: HARTMANN,LÉO A.; CHEMALE-JÚNIOR,FARID.
Valuable information is retrieved from the integrated investigation of the field relationships, microstructure and mineral compositions of harzburgites from the Neoproterozoic Cerro Mantiqueiras Ophiolite. This important tectonic marker of the geological evolution of southernmost Brazilian Shield was thoroughly serpentinized during progressive metamorphism, because the oldest mineral assemblage is: olivine + orthopyroxene + tremolite + chlorite + chromite. This M1 was stabilized in mid amphibolite facies - 550-600ºC as calculated from mineral equilibria. No microstructural (e.g. ductile deformation of olivine or chromite) or compositional (e.g. mantle spinel) remnant of mantle history was identified. A metamorphic event M2 occurred in the low amphibolite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral chemistry; Cerro Mantiqueiras Ophiolite; Metamorphism; Neoproterozoic.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100012

Comparative anatomy and histochemistry of the leaf blade of two species of Artocarpus
Provedor de dados: 42
Autores: SÁ,RAFAELA D.; CADENA,MARÍLIA B.; PADILHA,RAFAEL J.R.; ALVES,LUIZ CARLOS; RANDAU,KARINA P.
Abstract Abstract: In Brazil, there are two species of Artocarpus that were introduced: Artocarpus altilis (Parkinson) Fosberg, known as fruta-pão, and Artocarpus heterophyllus Lam., known as jaca. Both are used as food and medicine. The objective of this work was to conduct a comparative anatomical and histochemical study between A. altilis and A. heterophyllus. Techniques of optical, polarized and scanning electron coupled to energy dispersive spectroscopy. The anatomical characterization showed the characters of general occurrence in the family Moraceae and of those that allow the differentiation of A. altilis and A. heterophyllus. The histochemistry revealed the sites of synthesis and/or storage of the metabolites. The chemical microanalyses brought...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artocarpus altilis; Artocarpus heterophyllus; Crystals; Microscopy; Moraceae.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100851

Growth and intestinal morphology of juvenile pacu Piaractus mesopotamicus (Holmberg 1887) fed dietary prebiotics (mannanoligosaccharides - MOS)
Provedor de dados: 42
Autores: SADO,RICARDO Y.; BICUDO,ÁLVARO J.A.; CYRINO,JOSÉ E.P.
Intensification of aquaculture production systems exposes fish to numerous stressors, which may negatively affect their growth and limit profitability of aquaculture systems. This study determined effects of increasing levels of dietary mannanoligosaccharides on growth and intestine morphology of pacu. Fish (44.04 g) were randomly distributed into 32 tanks (500 L; 10 fishes per tank) and fed during 63 days with a commercial diet supplemented with 0.0; 0.2; 0.4; 0.6; 0.8; 1.0; 1.5 and 2.0% dietary mannanoligosaccharides. Growth parameters did not differ (P&gt;0.05) between fish fed control diet and mannanoligosaccharide supplemented diets. Intestinal villi perimeter was performed in fish fed control diet, 0.4 and 1.5% dietary mannanoligosaccharides and also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish nutrition; Histology; Piaractus mesopotamicus; Prebiotics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301517

Study of digoxin use in a public health unit
Provedor de dados: 42
Autores: Souza,Felipe C.; Marques,Emiliana B.; Scaramello,Rogério B.M.; Christianne,B.V.
Digoxin is used for heart failure associated to systolic dysfunction and high ventricular rate. It has a narrow therapeutic range and intoxication may occur due to drug interactions or comorbidities. The aim of this work was to study digoxin use in a public health unit delineating the profile of patients susceptible to digitalis intoxication. Medical records belonging to patients admitted to the cardiomyopathy ward of the health unit (2009-2010) and in use of digoxin were analyzed. Among 647 patients admitted, 185 individuals using digoxin and possessed records available. The registration of plasma digoxin concentration was found in 80 records and it was out of the therapeutic range in 42 patients (52.5%). This group of individuals was constituted mainly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digoxin; Intoxication; Public health unit; Therapeutic range.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201033

Scientometrics: Nature Index and Brazilian science
Provedor de dados: 42
Autores: SILVA,VALTER.
ABSTRACT A recent published newspaper article commented on the (lack of) quality of Brazilian science and its (in) efficiency. The newspaper article was based on a special issue of Nature and on a new resource for scientometrics called Nature Index. I show here arguments and sources of bias that, under the light of the principle in dubio pro reo, it is questionable to dispute the quality and efficiency of the Brazilian science on these grounds, as it was commented on the referred article. A brief overview of Brazilian science is provided for readers to make their own judgment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometrics; Brazil; Internationality; Journal Impact Factor; Research; Science.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401597

Study of mural paintings by Fulvio Pennacchi in São Paulo City by mineralogical techniques
Provedor de dados: 42
Autores: Del Lama,Eliane A.; Tirello,Regina A.; Andrade,Fábio R.D. de; Kihara,Yushiro.
The present research deals with two mural paintings made in 1947 with the fresco technique by Fulvio Pennacchi in the Catholic Chapel of the Hospital das Clínicas (São Paulo City, Brazil), namely the Virgin Annunciation and the Supper at Emmaus. This study regards the materials and painting techniques used by the artist, based on historical research,on in situ observations and laboratory analytical techniques (stereomicroscopy,scanning electron microscopy with an energy dispersive spectrometer, X-ray diffractometry, electron microprobe, images obtained with UV-light), aiming to improve the methods of characterization of objects of our cultural heritage, and to enhance its preservation accordingly. The results lead to the identification of the plaster...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Efflorescence; Frescoes; Mineralogical analysis; Pennacchi; Chapel of the Hospital das Clínicas.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100012

L'unification des forces en physique: les premières tentatives
Provedor de dados: 42
Autores: LOPES,JOSÉ LEITE.
The author gives a brief description of the studies that led to the eclosion of the weak forces model of unification of Electromagnetic interactions with weak interactions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weak forces model; Unification of interactions; Neutral Boson vectorial.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300004

Thermal requirements, development and number of generations of Duponchelia fovealis (Zeller) (Lepidoptera: Crambidae)
Provedor de dados: 42
Autores: PAES,JOÃO P.P.; LIMA,VICTOR L.S.; PRATISSOLI,DIRCEU; CARVALHO,JOSÉ R.; PIROVANI,VICTOR D.; BUENO,REGIANE C.O.F.
Abstract In this study, the effect of temperature on the growth of the European pepper moth, Duponchelia fovealis (Zeller), was assessed at five constant temperatures (18, 21, 24, 27 and 30 °C). The European pepper moth was observed to complete its developmental stages (from egg to adult) at all the temperatures evaluated. From the results, it was evident that temperature affected the rate and development time of all the growth stages, to a significant degree. The length in time of the embryonic, larval, pupal and total (egg-adult) stages was observed to drop as the temperature rose from 18 to 24 °C, but remained constant between 27 and 30 °C. The developmental time in the pre-pupal stage dropped between 18 and 30 °C. The European pepper moth takes 454...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Development rate; Developmental thresholds; European pepper moth; Longevity; Survival.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502447

The long and successful journey of electrochemically active amino acids. From fundamental adsorption studies to potential surface engineering tools.
Provedor de dados: 42
Autores: DOURADO,ANDRÉ H.B.; PASTRIÁN,FABIÁN C.; TORRESI,SUSANA I. CÓRDOBA DE.
ABSTRACT Proteins have been the subject of electrochemical studies. It is possible to apply electrochemical techniques to obtain information about their structure due to the presence of five electroactive amino acids that can be oriented to the outside of the peptidic chain. These amino acids are L-Tryptophan (L-Trp), L-Tyrosine (L-Tyr), L-Histidine (L-His), L-Methionine (L-Met) and L-Cysteine (L-Cys); their electrochemical behavior being subject of extensive research, but it is still controversial. No spectroscopic investigations have been reported on L-Trp, and due to the short life time of the intermediates, ex situ techniques cannot be employed, leading to a never-ending discussion about possible intermediates. In the L-Tyr and L-His cases,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protein electro-oxidation; Electrochemical active amino acids; L-Cysteine; SAM; Cu2O; Low index facets nanoparticles.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200607

Potential of predatory Neotropical ladybirds and minute pirate bug on strawberry aphid
Provedor de dados: 42
Autores: FRANCESENA,NATALIA; ROCCA,MARGARITA; RIZZO,ESTEFANÍA; ARNEODO,JOEL D.; GRECO,NANCY M.
Abstract Laboratory trials were performed to determine the impact of three Neotropical predatory coccinellids (Cycloneda sanguinea, Eriopis connexa and Coleomegilla quadrifasciata) and a minute pirate bug (Orius insidiosus) on Chaetosiphon fragaefolii, an important strawberry aphid pest. The predation on C. fragaefolii nymphs and adults, as well as the time to the first attack of all predators were compared with predation on Aphis gossypii. Predator preferences for prey and aphid defensive behavior were also evaluated. Moreover, the effect of coccinellids on C. fragaefolii population growth was assessed in experimental greenhouse conditions. The predation rate varied among predators, being significantly lower for O. insidiosus than for the coccinellids....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Biological control; Chaetosiphon fragaefolii; Fragaria x ananassa; Predation rate; Coccinellids.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700869

Nests, Eggs, and Nestlings of the Restinga Antwren Formicivora littoralis (Aves: Thamnophilidae)
Provedor de dados: 42
Autores: CHAVES,FLAVIA G.; VECCHI,MAURICIO B.; LAURINDO,THIAGO F.S.; ALVES,MARIA ALICE S.
We describe the nest, eggs, and nestlings of the Restinga Antwren (Formicivora littoralis), an endangered bird of Restinga ecosystem (sandy coastal plain vegetation) that is endemic to Rio de Janeiro state. Twelve nests were found at the edges of trails or natural gaps at Massambaba Restinga region, in different supporting plants and heights from the ground (X ± SD 1.27 ± 0.97 m, range 0.27 to 3.45 m). Nests were cup-shaped and were in horizontal forks attached to branches at three to five points with whitish, soft, and thin cotton-like vegetable fiber. The nests' cup shape and measurements were similar to congeneric species, but nest material was different. Eggs were white with brown spots concentrated on the large end or around the middle, giving the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Brazil; Breeding; Conservation; Endemic; Passeriformes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200547

The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin
Provedor de dados: 42
Autores: Jasper,André; Guerra-Sommer,Margot; Cazzulo-Klepzig,Miriam; Menegat,Rualdo.
Botrychiopsis has been considered an important floristic element of Westphalian/Artinskian associations of the Paraná Basin. The occurrence of Botrychiopsis in roof-shales of the Rio Bonito Formation in Southern Paraná Basin (Quitéria area), supported by the identification of Botrychiopsis valida, enlarges the genus biochron. Consequently, the stratigraphic hierarchy for Botrychiopsis plantiana and Botrychiopsis valida was defined for the Paraná Basin. Although it is climatically controlled and related to a deglaciation icehouse stage, stratigraphic distribution of the genus presents a substantial climate tolerance, from cold/cool to warm/temperate conditions. A new phytostratigraphic zonation is proposed for the southern portion of the basin that includes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Botrychiopsis; Biostratigraphy; Paraná Basin; Permian; Palaeoclimatology; Gondwana.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400009

Effects of Jatropha curcas oil inLactuca sativa root tip bioassays
Provedor de dados: 42
Autores: ANDRADE-VIEIRA,LARISSA F.; BOTELHO,CAROLINA M.; LAVIOLA,BRUNO G.; PALMIERI,MARCEL J.; PRAÇA-FONTES,MILENE M.
Jatropha curcas L. (Euphorbiaceae) is important for biofuel production and as a feed ingredient for animal. However, the presence of phorbol esters in the oil and cake renders the seeds toxic. The toxicity ofJ. curcas oil is currently assessed by testing in animals, leading to their death. The identification of toxic and nontoxic improved varieties is important for the safe use of J. curcas seeds and byproducts to avoid their environmental toxicity. Hence, the aim of this study was to propose a short-term bioassay using a plant as a model to screen the toxicity of J. curcas oil without the need to sacrifice any animals. The toxicity of J. curcas oil was evident in germination, root elongation and chromosomal aberration tests in Lactuca sativa. It was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomal aberration; Germination rate; Lactuca sativa; Phorbol esters; Root elongation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100373

Reproductive biology of a viviparous lizard (Mabuya dorsivittata) from the subtropical Wet Chaco of Argentina: geographical variations in response to local environmental pressures
Provedor de dados: 42
Autores: ORTIZ,MARTÍN A.; BORETTO,JORGELINA M.; IBARGÜENGOYTÍA,NORA R.
Herein we studied the reproductive biology of a viviparous lizard (Mabuya dorsivittata) from the Wet Chaco region (northeastern Argentina) and compared the results with other populations from the Espinal (central Argentina) and the Atlantic Forest (southeastern Brazil), and with other Neotropical species of Mabuya to better understand the possible causes of its reproductive phenotype variation. Males and females of M. dorsivittata from the Wet Chaco exhibited associated, seasonal, and annual reproductive cycles. Spermatogenic activity related positively to a lengthening photoperiod reaching maximum activity in late spring (December). Females displayed an extended gestation period of 11 months, from mid-summer (February) to late spring or early summer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproductive cycle; Sexual dimorphism; Ecotypic variation; Lizard; Squamata.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100609

Monitoring of air quality before the Olympic Games Rio 2016
Provedor de dados: 42
Autores: VENTURA,LUCIANA M.B.; RAMOS,MICHELLE B.; SANTOS,JÉSSICA O.; GIODA,ADRIANA.
For the accomplishment of Olympic and Paralympic Games in Rio de Janeiro city (Rio 2016), the government of the Rio de Janeiro state has undertaken to monitor air quality before and during the events. In Beijing, China, and Athens, Greece, the air quality was monitored in Olympic venues in order to evaluate the athletes’ performance in relation to the environment in which they were exposed. This study has the same proposal to Rio de Janeiro, Brazil. The air quality scenario of the three previous years (2013, 2014, 2015) of Rio 2016 was considered. Coarse (PM10) and fine (PM2.5) particles and O3 were monitored continuously on the stations located near to competition venues, as required by International Olympic Committee (IOC). The levels registered ranged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air quality; PM10; PM2.5; O3; Olympic Games.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100401

An overview of the Brazilian contributions to Green Analytical Chemistry
Provedor de dados: 42
Autores: GAMA,MARIANA R.; MELCHERT,WANESSA R.; PAIXÃO,THIAGO R.L.C.; ROCHA,FÁBIO R.P.
Abstract: Green Analytical Chemistry (GAC) is a research field that seeks for more sustainable analytical approaches to minimize the toxicity and amounts of wastes without hindering the analytical performance. This is a trend in Analytical Chemistry worldwide and because of the diversity of innovations on this subject, Brazil stands out as the third in the list of the main contributors to GAC, with ca. 11.2% of the published articles. Significant innovations and interesting applications in several fields have been presented and Brazil is continuously moving from Chemistry to Green Chemistry also in the Analytical Chemistry field. Selected contributions for sample preparation, spectro- and electroanalysis, separation techniques, chemometrics, and also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental friendly analytical chemistry; Green chemistry; Miniaturization; Microextractions; Reagentless procedures.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200403

Evidence of the Presence of Thyroid Hormones in Achatina fulica Snails
Provedor de dados: 42
Autores: LUSTRINO,DANILO; SILVA,ALBA C.M.; ARAUJO,IRACEMA G.; TUNHOLI,VICTOR M.; TUNHOLI-ALVES,VINÍCIUS M.; CASTRO,ROSANE N.; CARVALHO,DENISE P.; PINHEIRO,JAIRO; MARASSI,MICHELLE P.
ABSTRACT The objective of this study was to identify thyroid hormones and to examine their putative site of synthesis in Achatina fulica snails. For this purpose, radioimmunoassays were performed for T3 and T4 before and after long starvation with or without hemolymph deproteinization. Sodium/iodide symporter activity in vivo was analyzed through 125I administration with and without KClO4 pretreatment. Only T4 was detected, and its concentration decreased due to starvation or deproteinization. However, high-performance liquid chromatography analysis also showed the presence of T2 and T3 apart from T4, but rT3 was not detected in the A. fulica hemolymph. The sodium/iodide symporter activity was greater in cerebral ganglia than digestive gland, but KClO4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Achatina fulica; Sodium/iodine symport; Thyroid hormones; Thyroglobulin.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502181

Neotectonics as a structural control of the boundaries of the Pantanal Matogrossense Sub-Regions
Provedor de dados: 42
Autores: MIOTO,CAMILA L.; AMORIM,GUSTAVO; MACHADO,ROMULO; DALMAS,FABRÍCIO B.; OLIVEIRA,ANA PAULA G.; SAAD,ANTONIO R.; DIODATO,MARCO ANTONIO; FILHO,ANTONIO C. PARANHOS.
Abstract: Characterized by fluvio-alluvial sedimentation processes, the heterogeneity in the Pantanal Basin allows its division in several sub-regions, which present natural characteristics of their own. It is possible to find in the literature different proposals to subdivide the Pantanal plain, which vary in total area and number of sub-regions. Each author uses specific criteria – mainly vegetation, soil and humidity – in his delimitation, but does not consider the tectonic aspects of the basin. In this sense, we intend to analyze three Pantanal delimitations from the literature and to relate them to the neotectonic context of the Pantanal plain by comparing the boundaries proposed in the delimitations to structural lineaments present in the basin. As a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Structural lineaments; Geoecological context; Paraguay River Basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100503

New carbohydrazide derivatives of 1H-pyrazolo[3,4-b]pyridine and trypanocidal activity
Provedor de dados: 42
Autores: SALVADOR,RAQUEL R.S.; BELLO,MURILO L.; BARRETO,IGOR R.L.; VERA,MARIA A.F.; MURI,ESTELA M.F.; ALBUQUERQUE,SÉRGIO DE; DIAS,LUIZA R.S.
ABSTRACT This paper reports the in vitro trypanocidal activity evaluation of new carbohydrazide derivatives from 3-methyl-1-phenyl-1H-pyrazolo[3,4-b]pyridine, substituted at C-6 position by phenyl, methyl or trifluoromethyl group. These compounds were evaluated in order to identify the antiparasitic profile against trypomastigote and amastigote forms of Trypanosoma cruzi. The 4-carbohydrazide derivatives presented different profiles of activity. In the investigation of the chemical structure influence in the trypanocidal activity, the results indicated there are large lipophilicity and volume differences among these derivatives. The complementarities of their stereoelectronic and physical-chemical aspects seem to be relevant for the biological activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 1H-pyrazolo[3; 4-b]pyridine carbohydrazide derivatives biological activities trypanocidal activity molecular modeling.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602341

A scientific survey on 1550 cases of oral lesions diagnosed in a Brazilian referral center
Provedor de dados: 42
Autores: VASCONCELOS,ARTUR C.; ABURAD,CARLOS; LIMA,IGOR F.P.; SANTOS,SHEILA M.M.; FREITAS FILHO,SILAS ANTONIO J. DE; FRANCO,ADEMIR; RODE,SIGMAR M.; PARANHOS,LUIZ R.
ABSTRACT The present study aimed to perform an epidemiological survey on the prevalence rate of oral lesions diagnosed in a referral center in Brazil and to establish association between the lesions and the age and gender of the affected patients. This analytical observational study analyzed 3521 medical records of anatomopathological exams of the Pathological Anatomy and Cytopathology Laboratory of the Cancer Hospital of the state of Mato Grosso (Brazil), from December 2011 to September 2015. A total of 1550 relevant medical records was detected. Patients aging between 41 and 60 consisted of 42.84% of the sample. Males were more affected than females (60.13%). Inflammatory processess consisted of the most prevalent diagnosis (43.29%), followed by squamous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diagnosis; Oral medicine; Pathology; Stomatology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401691

Fishes of the Amazon: diversity and beyond
Provedor de dados: 42
Autores: VAL,ADALBERTO LUIS.
Abstract: The Amazon basin houses a particular group of freshwater organisms, whose study tells the geological history of the region, how biological diversity was shaped, how it is maintained, and what it hides. The fish of the Amazon is represented by more than 3,000 known species distributed from the basal groups up to the more specialized ones. This species richness hides a diversity of adaptations that are dispersed at all levels of the biological organization. In this summary of the conference delivered at the Brazil-France Bilateral Symposium, held in Manaus in 2018, we describe two aspects of the hidden world of adaptive diversity: adaptations to changes in dissolved oxygen and the abilities of the Rio Negro fish to face acidic and ion-poor waters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Biodiversity; Adaptations; Hypoxia; Dissolved organic carbon; Climate changes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600602

Birth weight patterns by gestational age in Brazil
Provedor de dados: 42
Autores: Pedreira,Carlos E.; Pinto,Francisco A.; Pereira,Silvia P.; Costa,Elaine S.
BACKGROUND AND OBJECTIVES: We present an updated birth weight-for-gestational-age portrait, based on nearly 8 million observations of an ethnic-mixed population. It comprises the first comprehensive charts with Brazilian data. This contribution intends to assist clinicians in classifying fetal growth, to provide a reference for investigations of predictors and to show the consequences of small and large patterns for gestational age delivery. Most of the reference data for assessing birth weight for gestational age deal with insufficient sample size, especially at low gestational age. Population-based studies with considerably large sample size refer to data collected more than 15 years ago. METHODS: We accomplished a population-based study on births in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birth weight; Newborn; Gestational age; Fetal growth; Preterm; Postterm.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200021

Antiproliferative activity in tumor cell lines, antioxidant capacity and total phenolic, flavonoid and tannin contents of  Myrciaria floribunda
Provedor de dados: 42
Autores: TIETBOHL,LUIS A.C.; OLIVEIRA,ADRIANA P.; ESTEVES,RICARDO S.; ALBUQUERQUE,RICARDO D.D.G.; FOLLY,DIOGO; MACHADO,FRANCISCO P.; CORRÊA,ARTHUR L.; SANTOS,MARCELO G.; RUIZ,ANA L.G.; ROCHA,LEANDRO.
ABSTRACT Myrciaria floribunda (H. West ex Willd.) O. Berg, Myrtaceae, is a native plant species of the Atlantic Rain Forest, from north to south of Brazil. The lyophilized ethyl acetate extract from the leaves of M. floribunda was investigated for its antiproliferative activity in tumor cell lines, antioxidant capacity and its total phenolic, flavonoid and tannin contents. Antiproliferative activity was tested in vitro against seven human cancer cells and against immortalized human skin keratinocytes line (HaCat, no cancer cell). Antioxidant activity was determined using 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging and oxygen radical absorbing capacity (ORAC) assays and total phenolic, flavonoid and tannin contents were determined by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiproliferative; Flavonoids; Myrciaria floribunda; Phenols.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301111

Dating stalagmite from Caverna do Diabo (Devil´S Cave) by TL and EPR techniques
Provedor de dados: 42
Autores: WATANABE,SHIGUEO; CANO,NILO F.; RAO,T.K. GUNDU; SILVA-CARRERA,BETZABEL N.; CARMO,LUCAS S.; QUINA,ANTONIO J.A.; GENNARI,ROSELI F.; MUNITA,CASIMIRO S.; AYALA-ARENAS,JORGE S.; FERNANDES,BRUNO G.
ABSTRACT A cylindrical fragment of stalagmite from Caverna do Diabo, State of São Paulo, Brazil, has been studied and dated by thermoluminescence and electron paramagnetic resonance techniques. The thermoluminescence glow curves of stalagmite samples and subsequently gamma irradiated, have shown rise of three peaks at 135, 180 and 265 °C. From electron paramagnetic resonance spectra of stalagmite was possible to clearly identify three paramagnetic centers in the g = 2.0 region: Centers I, II and III are due to , and , respectively. The additive method was applied to calculate the accumulated dose using thermoluminescence peak at 265 °C and the electron paramagnetic resonance signal at g = 1.9973 of CO- 2 radical. The ages of the different slices of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stalagmite; Caverna do Diabo; Dating; TL; EPR.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602137

Fungal colonization of the brain: anatomopathological aspects of neurological cryptococcosis
Provedor de dados: 42
Autores: COLOMBO,ANA CAROLINE; RODRIGUES,MARCIO L.
Brain infection by the fungus Cryptococcus neoformans results in an estimated 500,000 human deaths per annum. Colonization of the central nervous system (CNS) by C. neoformans causes different clinical syndromes that involve interaction of a number of fungal components with distinct brain cells. In this manuscript, our literature review confirmed the notion that the Cryptococcus field is expanding rapidly, but also suggested that studies on neuropathogenesis still represent a small fraction of basic research activity in the field. We therefore discussed anatomical and physiological aspects of the brain during infection by C. neoformans, in addition to mechanisms by which brain resident cells interact with the fungus. This review suggests that multiple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungal Infections; Cryptococcus; Meningitis; Meningoencephalitis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301293

Selection of alfalfa genotypes for resistance to the foliar pathogen Curvularia geniculata
Provedor de dados: 42
Autores: ÁVILA,MARIANA R.; DALL’AGNOL,MIGUEL; MARTINELLI,JOSÉ A.; SILVA,GERARDA B.P. DA; BREMM,CAROLINA; NUNES,TAMYRIS.
ABSTRACT Foliar diseases impose severe restrictions on the persistence and productivity of Medicago sativa, both of which may be increased by developing disease resistant and more competitive genotypes that can improve pasture quality. We found Curvularia geniculata as the principal alfalfa foliar pathogen in the Brazilian state of Rio Grande do Sul (RS). Growth chamber experiments evaluated the resistance of alfalfa genotypes ‘E1C4’, ‘CPPSul’, ‘ABT 805’ and ‘CUF-101’ to C. geniculata as compared the control ‘Crioula’ genotype. These genotypes were also evaluated in field trials at a sea level site in Eldorado do Sul in central RS and at two sites £200 m above sea level, one in Bagé municipality in south west RS and the other at a farm near the town of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lucerne; Invasive plants; Foliar pathogen; Forage legumes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401801

Ecological strategies of Al-accumulating and non-accumulating functional groups from the cerrado sensu stricto
Provedor de dados: 42
Autores: Souza,Marcelo C. de; Bueno,Paula C.P.; Morellato,Leonor P.C.; Habermann,Gustavo.
The cerrado's flora comprises aluminum-(Al) accumulating and non-accumulating plants, which coexist on acidic and Al-rich soils with low fertility. Despite their existence, the ecological importance or biological strategies of these functional groups have been little explored. We evaluated the leaf flushing patterns of both groups throughout a year; leaf concentrations of N, P, K, Ca, Mg, S, Al, total flavonoids and polyphenols; as well as the specific leaf area (SLA) on young and mature leaves within and between the groups. In Al-accumulating plants, leaf flushed throughout the year, mainly in May and September; for non-accumulating plants, leaf flushing peaked at the dry-wet seasons transition. However, these behaviors could not be associated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum; Community; Herbivory; Mineral nutrition; Phenology; Specific leaf area.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200813

Perception, knowledge and attitudes of Brazilian orthodontists on the treatment of Class II malocclusions
Provedor de dados: 42
Autores: KAIEDA,ARMANDO K.; LIMA,IGOR F.P.; SCANAVINI,MARCO ANTÔNIO; COQUEIRO,RAILDO S.; PITHON,MATHEUS M.; RODE,SIGMAR M.; PARANHOS,LUIZ RENATO.
ABSTRACT The present study aimed to assess the perception and knowledge of Brazilian orthodontists on the ideal moment to treat Class II malocclusions. Questionnaires with open, semi-open and close questions were sent by e-mail to 1653 Brazilian orthodontists. These orthodontists were registered in the Brazilian Association of Orthodontics and Dentofacial Orthopedics (ABOR). One-hundred and three (9.86%) Orthodontists replied to the questionnaires. Most of them were males (60.5%) with specialization as the highest level of professional qualification (59.9%). Most of the orthodontists (51%) reported preference for treating Class II malocclusions in late mixed dentition, followed by the early mixed dentition (29%). The age range between 10 and 12 years old...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orthodontic appliances; Attitudes; Diagnosis; Class II malocclusion.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602875

Understanding the mechanisms of glutamine action in critically ill patients
Provedor de dados: 42
Autores: Oliveira,Gisele P.; Dias,Cristina M.; Pelosi,Paolo; Rocco,Patricia R.M.
Glutamine (Gln) is an important energy source and has been used as a supplementary energy substrate. Furthermore, Gln is an essential component for numerous metabolic functions, including acid-base homeostasis, gluconeogenesis, nitrogen transport and synthesis of proteins and nucleic acids. Therefore, glutamine plays a significant role in cell homeostasis and organ metabolism. This article aims to review the mechanisms of glutamine action during severe illnesses. In critically ill patients, the increase in mortality was associated with a decreased plasma Gln concentration. During catabolic stress, Gln consumption rate exceeds the supply, and both plasma and skeletal muscle pools of free Gln are severely reduced. The dose and route of Gln administration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat shock protein; Apoptosis; Cytokines; Glutamine.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200018

COL18A1 is highly expressed during human adipocyte differentiation and the SNP c.1136C &gt; T in its "frizzled" motif is associated with obesity in diabetes type 2 patients
Provedor de dados: 42
Autores: Errera,Flavia I.V.; Canani,Luís H.; Yeh,Erika; Kague,Érika; Armelin-Corrêa,Lucia M.; Suzuki,Oscar T.; Tschiedel,Balduíno; Silva,Maria Elizabeth R.; Sertié,Andréa L.; Passos-Bueno,Maria Rita.
Collagen XVIII can generate two fragments, NC11-728 containing a frizzled motif which possibly acts in Wnt signaling and Endostatin, which is cleaved from the NC1 and is a potent inhibitor of angiogenesis. Collagen XVIII and Wnt signaling have recently been associated with adipogenic differentiation and obesity in some animal models, but not in humans. In the present report, we have shown that COL18A1 expression increases during human adipogenic differentiation. We also tested if polymorphisms in the Frizzled (c.1136C&gt;T; Thr379Met) and Endostatin (c.4349G&gt;A; Asp1437Asn) regions contribute towards susceptibility to obesity in patients with type 2 diabetes (113 obese, BMI =30; 232 non-obese, BMI &lt; 30) of European ancestry. No evidence of association...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: COL18A1; Obesity; Adipogenesis; Endostatin; Frizzled.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100012

Thin molecular films of supramolecular porphyrins
Provedor de dados: 42
Autores: ARAKI,KOITI; LIMA,SIMONE DE SOUZA; WINNISCHOFER,HERBERT.
A relevant series of symmetric supramolecular porphyrins has been obtained by attaching four [Ru II(bipy)2Cl] groups to the pyridyl substituents of meso-tetra(4-pyridyl)porphyrin and its metallated derivatives. These compounds display a rich electrochemistry and versatile catalytic, electrocatalytic and photochemical properties, associated with the ruthenium-bipyridine and the porphyrin complexes. These properties can be transferred to the electrodes by attaching thin molecular films of the compounds, by dip-coating, electrostatic assembly or electropolymerization. In this way, the interesting properties of those supermolecules and supramolecular assemblies can be used to prepare molecular devices and sensors.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polynuclear porphyrins; Thin molecular films; Chemical sensors.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100003

In vitro and in vivo antiproliferative activity of Calotropis procera stem extracts
Provedor de dados: 42
Autores: Magalhães,Hemerson I.F.; Ferreira,Paulo M.P.; Moura,Eraldo S.; Torres,Márcia R.; Alves,Ana P.N.N.; Pessoa,Otília D.L.; Costa-Lotufo,Letícia V.; Moraes,Manoel O.; Pessoa,Cláudia.
The cytotoxic potential of stem organic extracts from Calotropis procera (Asclepiadaceae) was firstly evaluated against cancer cell lines by MTT assay. Subsequently, samples considered cytotoxic were tested for antimitotic activity on sea urchin egg development and for in vivo antiproliferative activity in mice bearing Sarcoma 180 tumor. Among the five extracts (hexane, dichloromethane, ethyl acetate, acetone and methanol), ethyl acetate and acetone extracts displayed higher cytotoxic potential against tumor cells, with IC50 ranging from 0.8 to 4.4 μg/mL, while methanolic extract was weakly cytotoxic. Cytotoxic extracts also exhibited cell division inhibition capacity by antimitotic assay, revealing IC50 values lower than 5 μg/mL. In the in vivo antitumor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimitotic; Antiproliferative; Calotropis procera; Sarcoma 180 tumor; Stem extracts.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200017

Agronomic efficiency of intercropping tomato and lettuce
Provedor de dados: 42
Autores: Cecílio Filho,Arthur B.; Rezende,Bráulio L.A.; Barbosa,José C.; Grangeiro,Leilson C.
Four experiments were carried out at the São Paulo State University, Brazil, with the aim of determining the agronomic viability of intercropping tomato and lettuce, under greenhouse conditions. The studied intercropping systems were established by transplanting lettuce at 0, 10, 20 and 30 days after transplanting (DAT) tomato and by transplanting tomato at 0, 10, 20 and 30 DAT lettuce. Intercropped tomato and lettuce were evaluated during two seasons and compared to their sole cropping. The experimental design was a randomized complete block with nine treatments. The productivity and the classification of the tomato fruits were not influenced by having lettuce intercropped with it, but lettuce production was lowered when tomato was intercropped with it....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cropping systems; Greenhouse; Lactuca sativa; Solanum lycopersicon; Planting time.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300029

Control of filariasis insect vector in Recife, Pernambuco, Northeastern Brazil
Provedor de dados: 42
Autores: FURTADO,ANDRÉ F.; REGIS,LEDA N.; SOUZA,WAYNER V.; ALBUQUERQUE,MARIA DE FATIMA M.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300029

Source correlation of biomarkers in a mangrove ecosystem on Santa Catarina Island in southern Brazil
Provedor de dados: 42
Autores: Silva,Cesar A.; Madureira,Luiz A.S.
The relative distribution of several compounds identified in four samples of recently deposited sediments of the Itacorubi Mangrove located on the Santa Catarina Island, southern Brazil, was compared with similar data on compounds extracted from fresh leaves of three mangrove species (Avicennia schaueriana, the dominant species in the area, Rhizophora mangle and Laguncularia racemosa) and the Gramineae Spartinna alterniflora. Terpenols, previously identified in mangrove species in northern Brazil, were also found. A. schaueriana mainly contains β-amyrin (90.6 μg g-1 of extractable organic matter); low amounts of friedelin, betulin and germanicol were detected only in the leaf extract of this species. R. mangle also contained a significant amount of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomarkers; Leaf; Mangrove; Santa Catarina; Sediment.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300002

Spatial Distribution of Euschistus heros (Hemiptera: Pentatomidae) in Cotton (Gossypium hirsutum Linnaeus)
Provedor de dados: 42
Autores: WEBER,ANDERSON C.; DEGRANDE,PAULO E.; SOUZA,ELLEN P. DE; AZAMBUJA,ROSALIA; FERNANDES,MARCOS G.
Abstract Recently, the Neotropical brown stink bug, Euschistus heros (Pentatomidae: Hemiptera), has been detected in cotton in the Brazilian Cerrado. Several reliable surveys have been conducted on the spatial distribution of stink bugs in soybean; however, few studies have examined the behavior of this insect in cotton in Brazil. Thus, this study examined the spatial distribution of E. heros in cotton using aggregation indices based on the variance-to-mean ratio, Morisita index, exponent k, Poisson and negative binomial distributions. Inverse Distance Weighting interpolation maps were also used to represent insect density. The study was conducted in a 1.1 hectare experimental cotton field in which 64 equally-sized plots were sampled on a weekly basis. Our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregation Indices; Dispersion; GIS; IPM; Negative Binomial.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703483

Dating of fossil human teeth and shells from Toca do Enoque site at Serra das Confusões National Park, Brazil
Provedor de dados: 42
Autores: KINOSHITA,ANGELA; SULLASI,HENRY L.; ASFORA,VIVIANE K.; AZEVEDO,RENATA L.; GUZZO,PEDRO; GUIDON,NIEDE; FIGUEIREDO,ANA MARIA G.; KHOURY,HELEN; PESSIS,ANNE-MARIE; BAFFA,OSWALDO.
ABSTRACT This work reports the dating of a fossil human tooth and shell found at the archaeological site Toca do Enoque located in Serra das Confusões National Park (Piauí, Brazil). Many prehistoric paintings have been found at this site. An archaeological excavation unearthed three sepulchers with human skeletons and some shells. Two Brazilian laboratories, in Ribeirão Preto (USP) and Recife (UFPE), independently performed Electron Spin Resonance (ESR) measurements to date the tooth and the shell and obtain the equivalent dose received by each sample. The laboratories determined similar ages for the tooth and the shell (~4.8 kyBP). The results agreed with C-14 dating of the shell and other samples (charcoal) collected in the same sepulcher. Therefore,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dating; ESR; EPR; Shell; Tooth; Enamel.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300847

Use of pedological maps in the identification of sensitivity of soils to acidic deposition: application to Brazilian soils
Provedor de dados: 42
Autores: Melfi,Adolpho J.; Montes,Celia R.; Carvalho,Adilson; Forti,Maria Cristina.
The pedogeochemical maps present the spatial distribution of soils according to crystalochemical parameters (clay fraction) and physic-chemical aspects of the sorting complex (CEC and BS). These maps are adequate tool for environmental studies and particularly, for the analysis of the terrestrial ecosystem sensibility to acidic deposition. The pedogeochemical maps of the Brazilian soils, elaborated using FAO SoilWorld Map, allowed establishing the soil distribution according to 5 classes of vulnerability to acidic deposition, as defined by Stockholm Environmental Institute (SEI). From these maps, it is observed that about 50% of the Brazilian soils are high vulnerable to acidic deposition and can be included within the most sensitive class. This group is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian soils; Pedogeochemical map; Soil buffering ability.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100012

Paleomagnetism of Caacupé and Itacurubí groups, western border of Paraná Basin, Paraguai
Provedor de dados: 42
Autores: Berquó,Thelma S.; Ernesto,Marcia; Siqueira,Roberto.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400020

Permian plants from the Chutani Formation (Titicaca Group, Northern Altiplano of Bolivia): I. Genera Pecopteris and Asterotheca
Provedor de dados: 42
Autores: Vieira,Carlos E. L.; Iannuzzi,Roberto; Guerra-Sommer,Margot; Díaz-Matrínez,Enrique; Grader,George W.
Fossil plants belonging to the morphogenera Glossopteris, Pecopteris and Asterotheca were collected from the upper part of the Chutani Formation (Titicaca Group), near the town of San Pablo de Tiquina, on the southeastern shore of Lake Titicaca (northern Altiplano, Bolivia). Here we report the analysis of fern-type foliage found at this location. Three species of pecopterid fronds are identified: Pecopteris dolianitii Rohn and Rösler, P. cf. P. cadeadensis Rohn and Rösler, and P. cf. P. pedrasica Read. All these species are typically found in Permian deposits of the Paraná Basin in southern Brazil. Despite the poor preservation of the material, a fertile specimen could be studied and was determined as Asterotheca sp. The paleoenvironmental and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altiplano of Bolivia; Permian; Pecopteris; Asterotheca.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100010

The length of the second fundamental form, a tangency principle and applications
Provedor de dados: 42
Autores: Fontenele,Francisco X.; Silva,Sérgio L.
In this paper we prove a tangency principle (see Fontenele and Silva 2001) related with the length of the second fundamental form, for hypersurfaces of an arbitrary ambient space. As geometric applications, we make radius estimates of the balls that lie in some component of the complementary of a complete hypersurface into Euclidean space, generalizing and improving analogous radius estimates for embedded compact hypersurfaces obtained by Blaschke, Koutroufiotis and the authors. The basic tool established here is that some operator is elliptic at points where the second fundamental form is positive definite.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypersurfaces; Tangency principle; Second fundamental form; Balls; Radius estimates.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100001

Evaluation of the complexity and performance of marine planktonic trophic models
Provedor de dados: 42
Autores: LELES,SUZANA G.; VALENTIN,JEAN L.; FIGUEIREDO,GISELA M.
ABSTRACT Planktonic models represent a powerful tool for creating hypotheses and making predictions about the functioning of marine ecosystems. Their complexity varies according to the number of state variables and the choice of functional forms. We evaluated plankton models during the last 15 years (n =145) with the aims of understanding why they differ in complexity, evaluating model robustness, and describing studies of plankton modelling around the globe. We classified models into four groups: Nutrient-Phytoplankton-Zooplankton (NPZ), Nutrient-Phytoplankton-Zooplankton-Detritus (NPZD), Size-Structured (SS) and Plankton-Functional-Type (PFT). Our results revealed that the number of state variables varied according to the question being addressed: NPZ...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological modelling; Marine plankton; Model complexity; Trophodynamics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501971

Coherent soliton propagation through doped optical fibers: cloning, breakup, and soliton interactions
Provedor de dados: 42
Autores: CAVALCANTI,SOLANGE B.; FONSECA,EDUARDO J. DA S.; CAETANO,DILSON P.; HICKMANN,JANDIR M.
The simultaneous propagation of two optical pulses through a doped nonlinear dispersive medium modelled by a resonant three-level system was investigated numerically, within the framework of a pair of coupled extended nonlinear Schrödinger equations. These included the contribution of the dopant resonances whose dynamics is governed by Bloch equations. In this work, we review the interesting possibilities on the manipulation of fields such as cloning, breakup and soliton interactions, that the combination of coherent population trapping with nonlinear dispersive media offers.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soliton; Quantum coherence; Nonlinearity; Cloning.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200005

Sol-gel as methodology to obtain bioactive materials
Provedor de dados: 42
Autores: RIBEIRO,THIAGO J.; LIMA,OMAR J. DE; FARIA,EMERSON H.; ROCHA,LUCAS A.; CALEFI,PAULO S.; CIUFFI,KATIA J.; NASSAR,EDUARDO J.
We employed the sol­gel methodology to obtain a silica matrix modified with calcium and phosphate ions. We prepared the matrix by hydrolysis and condensation of the precursors triethyl phosphate, calcium nitrate, and tetraethylorthosilicate, which were the sources of phosphate, calcium, and silicon, respectively. We dried and heat­treated the samples at 110 or 900°C and placed them in simulated body fluid (SBF) for three days. We conducted scanning electron microscopy, X­ray diffraction, and infrared spectroscopy analyses, which evidenced that the sample treated at 110°C contained calcium phosphate silicate and hydroxyapatite before and after contact with SBF, respectively. The sample treated at 900°C exhibited a hydroxyapatite phase before and after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomateriais; Bioativo; SBF; Metodologia sol­gel.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100027

Secondary metabolites from Ananas bracteatus Lindley (Bromeliaceae)
Provedor de dados: 42
Autores: Rocha,Fabíola D.; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200026

Dental caries at Lapa do Santo, central-eastern Brazil: An Early Holocene archaeological site
Provedor de dados: 42
Autores: DA-GLORIA,PEDRO; OLIVEIRA,RODRIGO E.; NEVES,WALTER A.
ABSTRACT The origin and dispersion of the first Americans have been extensively investigated from morphological and genetic perspectives, but few studies have focused on their health and lifestyle. The archaeological site of Lapa do Santo, central-eastern Brazil, has exceptionally preserved Early Holocene human skeletons, providing 19 individuals with 327 permanent and 122 deciduous teeth dated to 9,250 to 7,500 years BP. In this study, we test whether the inhabitants of Lapa do Santo had high prevalence of dental caries as previous studies of Lagoa Santa collection have indicated, using individual and tooth as units of analyses. The results show a high prevalence of dental caries in the permanent dentition (5.50%, n=327 teeth; 69.23%, n=13 individuals)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioarchaeology; Brazilian prehistory; Dental pathologies; Lagoa Santa; Oral health; Paleoamericans.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100307

Chemical composition and biological activities of the essential oils from Vitex-agnus castus, Ocimum campechianum and Ocimum carnosum
Provedor de dados: 42
Autores: RICARTE,LARA P.; BEZERRA,GABRIELI P.; ROMERO,NIRLA R.; SILVA,HORLANDO C. DA; LEMOS,TELMA L.G.; ARRIAGA,ANGELA M. C.; ALVES,PÉRICLES B.; SANTOS,MARCELO B. DOS; MILITÃO,GARDENIA C.G.; SILVA,THIAGO D.S.; BRAZ-FILHO,RAIMUNDO; SANTIAGO,GILVANDETE M.P.
Abstract  The essential oils obtained by hydrodistillation from fresh leaves of Vitex agnus-castus and Ocimum campechianum, and from fresh inflorescences of Ocimum carnosum were analysed by GC-FID and GC-MS. The major components of V. agnus-castus essential oil were identified as 1,8-cineole (47.9%), terpinyl α-acetate (11.6%), sabinene (11.2%) and caryophyllene oxide (9.7%), while in the O. campechianum essential oil were eugenol (72.1%), β-elemene (6.8%), (E)-caryophyllene (6.4%) and bicyclogermacrene (5.2%). Linalool (79.0%), α-epi-cadinol (5.4%), terpinen-4-ol (3.2%) and 1,8-cineole (2.8%) were the major constituents in the O. carnosum essential oil. The essential oils were subsequently evaluated for their larvicidal and cytotoxic activities. Larval...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Cytotoxic activity; Lamiaceae; Larvicidal activity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100718

Biodiversity studies through public-private partnership (PPP): The case of Fazenda São Nicolau in the northwest of Mato Grosso
Provedor de dados: 42
Autores: RODRIGUES,DOMINGOS J.; VAZ-DE-MELLO,FERNANDO Z.; SILVEIRA,ROBERTO M.L.
Abstract: Peugeot-ONF Forest Carbon Sink Project, located at Fazenda São Nicolau (FSN) in Cotriguaçu Municipality, is a public-private initiative and has been supported by several French and Brazilian institutions. Its Research Program includes studies aiming Biodiversity Conservation, Ecology, Carbon Dynamics, Silvicultural Techniques. FSN comprises a high richness of species with more than 20 new species of beetles (Histeridae, Scarabaeidae e Melolonthidae) described among them one endemic genus. A quick overview of the SuperFamily Scarabaeoidea within the FSN area registered 260 species which nearly 100 species might be new to Science. One new species of fish as well as research with amphibian toxins as tools to treat cancer and malaria are also done...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Amazon; Carbon Sink Project; Refugee.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600608

Isoflavonoid composition and biological activity of extracts from soybean seedlings treated by different elicitors
Provedor de dados: 42
Autores: DURANGO,DIEGO; MURILLO,JENNIFER; ECHEVERRI,FERNANDO; ESCOBAR,GUSTAVO; QUIÑONES,WINSTON.
Abstract Time-course and dose-response experiments were carried out to establish the ability for synthesizing isoflavonoids of soybean seedlings (cv. Soyica P34) treated with salicylic (SA) and isonicotinic acids (INA). Then, 25 structurally-related compounds were evaluated for their isoflavonoid-eliciting activity. Next, the antimicrobial and antioxidant activities of EtOAc-soluble fraction from soybean seedlings treated with some synthetic elicitors were determined. Results showed that the concentration of isoflavonoids in soybean seedlings was significantly increased by the application of SA and INA. The major isoflavonoids detected were the malonyl-glycosidic isoflavones, followed by genistin and daidzin. The isoflavone aglycones (genistein, daidzein,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elicitors; Isoflavonoids; Salicylic acid; Soybean.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501955

Effects of light intensity on the distribution of anthocyanins in Kalanchoe brasiliensis Camb. and Kalanchoe pinnata (Lamk.) Pers
Provedor de dados: 42
Autores: Cruz,Bruna P.; Chedier,Luciana M.; Peixoto,Paulo H.P.; Fabri,Rodrigo L.; Pimenta,Daniel S.
This paper compares two medicinal species of Kalanchoe, which are often used interchangeably by the population, regarding the distribution of anthocyanins under the influence of four luminosity levels for 6 months. For the morphoanatomical analysis, the 6th stem node of each plant was sectioned. Usual histochemical tests revealed the presence of anthocyanins by cross sections of the stems, petioles and leaf blades. The petioles and leaf blades were submitted to the extraction with acidified methanol, and the anthocyanins were quantified by spectrophotometric readings. At the macroscopic level, it was noticed for both species a higher presence of anthocyanins in stems and petioles of plants under full sunlight. The microscopy of K. brasiliensis stems...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthocyanins; Kalanchoe; Luminosity; Vegetal anatomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100022

Oral insulin improves metabolic parameters in high fat diet fed rats
Provedor de dados: 42
Autores: LIPINSKI,LEANDRO C.; KMETIUK,LOUISE B.; MATHIAS,PAULO C.F.; MALTA,ANANDA; FAVERO,GIOVANI M.; RIBEIRO,TATIANE A.; TOLEDO,ALCEU; NETTO,MARIO R. MONTEMOR; RODRIGUES,MARCOS R.S.
ABSTRACT Introduction/Aim: The gut has shown to have a pivotal role on the pathophysiology of metabolic disease. Food stimulation of distal intestinal segments promotes enterohormones secretion influencing insulin metabolism. In diabetic rats, oral insulin has potential to change intestinal epithelium behavior. This macromolecule promotes positive effects on laboratorial metabolic parameters and decreases diabetic intestinal hypertrophy. This study aims to test if oral insulin can influence metabolic parameters and intestinal weight in obese non-diabetic rats. Methods: Twelve weeks old Wistar rats were divided in 3 groups: control (CTRL) standard chow group; high fat diet low carbohydrates group (HFD) and HFD plus daily oral 20U insulin gavage (HFD+INS)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oral insulin; Intestine; Diabetes; Obesity; Metabolism; Pancreatic beta-cell.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401699

Development of Dichelops melacanthus and its egg parasitoid Telenomus podisi reared on Bt-soybean MON 87701 x MON 89788 and its near conventional isoline under different temperatures
Provedor de dados: 42
Autores: Bortolotto,Orcial C.; Bueno,Adeney F.; Stopa,Ynaiara K.; Silva,Gabriela V.; Queiroz,Ana Paula.
Dichelops melacanthus was studied under controlled conditions (60 ± 10% RH and 14/10 h L/D photoperiod), and three constant temperatures (19, 25, and 31 ± 2 °C). Fresh pods of MON 87701 × MON 89788 soybeans and its near non-Bt isoline (A5547) were supplied to nymphs and adults. The biology of T. podisi was studied in the same controlled RH conditions, but only at the standard temperature of 25 ± 2 °C. Overall, the development of D. melacanthus was better at higher temperatures, which accelerated the development of the stink bug without affecting adult biological parameters. No influence of Bt-soybeans on the biology of the pest was observed in any temperature studied, which shows that D. melacanthus is not affected by this transgenic soybean. The egg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg parasitoids; Global warming; Natural enemy; Non-target organisms.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301023

Oogenesis and egg development in triatomines: a biochemical approach
Provedor de dados: 42
Autores: Atella,Georgia C.; Gondim,Katia C.; Machado,Ednildo A.; Medeiros,Marcelo N.; Silva-Neto,Mário A.C.; Masuda,Hatisaburo.
In triatomines, as well as in other insects, accumulation of yolk is a process in which an extra-ovarian tissue, the fat body, produces yolk proteins that are packed in the egg. The main protein, synthesized by the fat body, which is accumulated inside the oocyte, is vitellogenin. This process is also known as vitellogenesis. There are growing evidences in triatomines that besides fat body the ovary also produces yolk proteins. The way these yolk proteins enter the oocyte will be discussed. Yolk is a complex material composed of proteins, lipids, carbohydrates and other minor components which are packed inside the oocyte in an organized manner. Fertilization triggers embryogenesis, a process where an embryo will develop. During embryogenesis the yolk will...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oogenesis; Vitellogenesis; Embryogenesis; Triatomines; Rhodnius prolixus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300005

A new protodidelphid (Mammalia, Marsupialia, Didelphimorphia) from the Itaboraí Basin and its implications for the evolution of the Protodidelphidae
Provedor de dados: 42
Autores: CARNEIRO,LEONARDO M.
Abstract The Protodidelphidae was a group of marsupials that lived in Gondwana from the early to middle Eocene. Among South American faunas, the Itaboraí Basin calls attention by the presence of four genera and six species. Herein is described Bergqvistherium primigenia gen. et sp. nov., a new protodidelphid from the Itaboraí Basin - lower Eocene. This taxon differs from other protodidelphids in the smaller size, developed entocristid, less brachyo-bunoid adaptations, and entoconid more mesial than the hypoconid. These characters are recovered as plesiomorphies of the Protodidelphidae, supporting Bergqvistherium as an early-divergent lineage of this group. The Protodidelphidae fauna of the Itaboraí Basin is represented by less specialized “basal” taxa,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metatheria; Paleogene; Systematics; Teeth.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400507

Parasite infracommunities of  Leporinus friderici: A comparison of three tributaries of the Jurumirim Reservoir in southeastern Brazil
Provedor de dados: 42
Autores: YAMADA,FÁBIO H.; BONGIOVANI,MARCELA F.; YAMADA,PRISCILLA O.F.; SILVA,REINALDO J. DA.
ABSTRACT The degradation and homogenization of natural habitats is considered a major cause of biotic homogenization. Many studies have been undertaken on the effects of dams on aquatic wildlife, in particular fish assemblages. But how do dams affect the parasitic fauna of such fish? The aim of the present study was to examine parasitic similarity, comparing the diversity and structure of parasite communities of Leporinus friderici (Characiformes, Anostomidae) in three upstream tributaries under the influence of the Jurumirim Dam on the Upper Paranapanema River in southeastern Brazil. The present study did not find any significant differences in parasite communities among populations of L. friderici in the three upstream tributaries. This result highlights...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical region; Leporinus friderici; Metazoan parasites; Similarity; Watershed conservation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300953

Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil
Provedor de dados: 42
Autores: Cardoso,Fernanda C.G.; Salvalaggio,Ana P.B.; Marques,Márcia C.M.
The expectations that shade-tolerant forest species show 1) a population structure composed by a high amount of small individuals, and 2) biomass allocation for diameter higher than for height growth, were tested for Rudgea parquioides, a typical shrub in Southern Brazil. We described the size structure (height and stem diameter) and allometrical relations of a R. parquioides population by counting and measuring all the individuals in a 725m² area in the municipality of Curitiba (25"25'S; 49"19'W). A total of 916 individuals (12,634 ind.ha-1) were recorded in the area. The firstexpectation was supported, since distribution by height and diameter classes showed a predominance of small individuals (skewness coefficients &amp;gt; 1). On the other hand, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Araucaria forest; Size distribution; Subtropical forest; Understorey.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300011

Explicit and implicit modeling of nanobubbles in hydrophobic confinement
Provedor de dados: 42
Autores: Dzubiella,Joachim.
Water at normal conditions is a fluid thermodynamically close to the liquid-vapor phase coexistence and features a large surface tension. This combination can lead to interesting capillary phenomena on microscopic scales. Explicit water molecular dynamics (MD) computer simulations of hydrophobic solutes, for instance, give evidence of capillary evaporation on nanometer scales, i.e., the formation of nanometer-sized vapor bubbles (nanobubbles) between confining hydrophobic surfaces. This phenomenon has been exemplified for solutes with varying complexity, e.g., paraffin plates, coarse-grained homopolymers, biological and solid-state channels, and atomistically resolved proteins. It has been argued that nanobubbles strongly impact interactions in nanofluidic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solvation; Hydrophobicity; Nanobubbles; Implicit water model; Molecular dynamics simulations.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100002

Seed reserve composition and mobilization during germination and early seedling establishment of Cereus jamacaru D.C. ssp. jamacaru (Cactaceae)
Provedor de dados: 42
Autores: Alencar,Nara L.M.; Innecco,Renato; Gomes-Filho,Enéas; Gallão,Maria Izabel; Alvarez-Pizarro,Juan C.; Prisco,José T.; Oliveira,Alexandre B. De.
Cereus jamacaru, a Cactaceae found throughout northeast Brazil, is widely used as cattle food and as an ornamental and medicinal plant. However, there has been little information about the physiological and biochemical aspects involved in its germination. The aim of this study was to investigate its reserve mobilization during germination and early seedling growth. For this, C. jamacaru seeds were germinated in a growth chamber and collected at 0, 2, 4, 5, 6, 8 and 12 days after imbibition for morphological and biochemical analyses. Dry seeds had wrinkled seed coats and large, curved embryos. Lipids were the most abundant reserve, comprising approximately 55% and 65% of the dry mass for cotyledons and the hypocotylradicle axis, respectively. Soluble sugars...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactaceae; Carbohydrates; Cytochemistry; Lipids; Morphology; Proteins.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300024

Growth and hematology of juvenile pacu Piaractus mesopotamicus (Holmberg 1887) fed with increasing levels of vitamin E (DL-α-tocopheryl acetate)
Provedor de dados: 42
Autores: SADO,RICARDO Y.; BICUDO,ÁLVARO J.A.; CYRINO,JOSÉ E.P.
Intensive fish production systems are characterized by 100% artificial feeding, so any dietary imbalances or deficiencies may lead to diseases outbreaks and economic losses. This study was set out to determine the effects of increasing levels of dietary vitamin E on growth and hematology of juvenile pacu. Fishes were fed for 90 days, twice a day until apparent satiation with semi-purified diets containing 0.0; 25; 50; 150; 300 or 600 mg.kg−1 diet DL-α-tocopheryl acetate in a completely randomized design trial (n=4); biometrical and hematological data were collected and analyzed. Fishes fed with vit E diet (150 mg.kg−1) showed higher (p&lt;0.05) weight gain and specific growth. Hematocrit, erythroblast number and total plasma protein were increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish nutrition; Hematology; Piaractus mesopotamicus; Vitamin E.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100385

The density of females of Palmistichus elaeisis Delvare and LaSalle (Hymenoptera: Eulophidae) affects their reproductive performance on pupae of Bombyx mori L. (Lepidoptera: Bombycidae)
Provedor de dados: 42
Autores: Pereira,Fabricio F.; Zanuncio,José C.; Serrão,José E.; Zanuncio,Teresinha V.; Pratissoli,Dirceu; Pastori,Patrik L.
Palmistichus elaeisis Delvare and LaSalle (Hymenoptera: Eulophidae) is a gregarious and polyphagous parasitoid mainly of Lepidoptera pupae. The objective of this paper as to study the developent of parasitoid on Bombyx mori L. (Lepidoptera: Bombycidae) pupae exposed to one, nine, 18, 27, 36, 45 or 54 female P. elaeisis, respectively. The females of the parasitoid remained in contact with pupae for 24 hours in glass tubes (14.0 x 2.2 cm), packed in a climatic chamber regulated at 25 ± 2°C, 70 ± 10% relative humidity and photo phase of 12 hours. With the exception of density 1:1 (72.72%), in other densities parasitism was 100%. Adults of P. elaeisis did not emerge from pupae at densities of 1:1 and 9:1, but 100.0% of parasitoid emergence was observed at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative host; Biological control; Mass rearing; Parasitism rate; Parasitoids.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200008

Acanthagrion marinae sp. nov. (Zygoptera: Coenagrionidae): a new species of the apicale group
Provedor de dados: 42
Autores: LOZANO,FEDERICO; RODRIGUES,MARCIEL E.
Abstract Acanthagrion marinae sp. nov. (Holotype male: BRASIL, Mato Grosso do Sul, Campo Grande, UFMS, 20°29’56.26’’S - 54°36’48.43’’W, 547m, leg. M.E. Rodrigues, 03.ii.2015, collection code: VZYG437, MLP) is described and illustrated on the basis of 15 males. The new species belongs to the apicale species group by having horns on S10 and sclerotized hooks on tip of distal segment of the genital ligula. It can be easily distinguished from other species of the group by a combination of characters of the genital ligulae (presence of setae on segment two; absence of setae at flexure; distal lateral lobes of segment three absent). Notes on habitat and a modification of previous keys for the species of the apicale group are provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acanthagrion; Coenagrionidae; Neotropics; Odonata; Zygoptera.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602865

Evaluation of the predisposition and clinical impact of BK virus replication in kidney transplant patients
Provedor de dados: 42
Autores: MOURA,ELVIANI B.; PETZHOLD,SILVIA V.; AMARAL,AUGUSTO R.; DEBONI,LUCIANE M.; FRANÇA,PAULO H.C. DE.
ABSTRACT The BK virus (BKV) produces a subclinical kidney infection in immunocompetent individuals. However, viremia may occur in kidney transplant patients with ongoing immunosuppression. BKV-associated nephropathy (BKVN) has no specific treatment and is a leading cause of organ transplant loss. In this study, we evaluated the predisposition and the clinical impact of BKV replication in kidney transplant patients during post-transplant monitoring in a reference institution in Brazil. Demographic, clinical and laboratory data generated during routine outpatient follow-up were retrospectively collected. BK viremia was investigated using real-time polymerase chain reaction. Of the 553 participants, 7.4% (n = 41) presented BKV replication. Of these, 16 (39%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BK virus; Nephropathy; Renal transplantation; Viremia.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200675

Cholinesterase as inflammatory markers in a experimental infection by Trypanosoma evansi in rabbits
Provedor de dados: 42
Autores: Costa,Márcio M.; Silva,Aleksandro S. da; Paim,Francine C.; França,Raqueli; Dornelles,Guilherme L.; Thomé,Gustavo R.; Serres,Jonas D.S.; Schmatz,Roberta; Spanevello,Rosélia M.; Gonçalves,Jamile F.; Schetinger,Maria Rosa C.; Mazzanti,Cinthia M.A.; Lopes,Sonia T.A.; Monteiro,Silvia G.
The aim of this study is to evaluate the role of cholinesterases as an inflammatory marker in acute and chronic infection by Trypanosoma evansi in rabbits experimentally infected. Twelve adult female New Zealand rabbits were used and divided into two groups with 6 animals each: control group (rabbits 1-6) and infected group (rabbits 7-12). Infected group received intraperitoneally 0.5 mL of blood from a rat containing 108 parasites per animal. Blood samples used for cholinesterases evaluation were collected on days 0, 2, 7, 12, 27, 42, 57, 87, 102 and 118 days post-inoculation (PI). Increased activity (P&lt;0.05) of butyrylcholinesterase (BChE) and acetylcholinesterase (AChE) were observed in the blood on days 7 and 27, respectively and no differences were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase butyrylcholinesterase inflammation; T. evansi.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400024

Isolation and prospection of diazotrophic rhizobacteria associated with sugarcane under organic management
Provedor de dados: 42
Autores: RODRIGUES,ARIANA A.; ARAÚJO,MARCUS VINÍCIUS F.; SOARES,RENAN S.; OLIVEIRA,BRUNO F.R. DE; RIBEIRO,IGOR D.A.; SIBOV,SERGIO T.; VIEIRA,JOSÉ DANIEL G.
Abstract Microorganisms associated with organic management are essential in nutrient transformation and release for plant use. The present study aimed to isolate, identify and characterize plant growth promoting diazotrophic rhizobacteria associated with sugarcane under organic management. Rhizospheres of organic sugarcane varieties IAC 911099 and CTC4 were sampled and inoculated onto nitrogen free NFb and Burk media. The isolated microorganisms were screened in vitro concerning their ability to produce plant growth promoting factors. Eighty-one bacteria were isolated; 45.6% were positive for the nifH gene and produced at least one of the evaluated plant growth promotion factors. The production of indole-3-acetic acid was observed in 46% of the isolates,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic agriculture; Plant growth promoting rhizobacteria; NifH; Burkholderia; Sphingobium; Rhizobium.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703813

Growth of tree species and sugarcane production in agroforestry systems
Provedor de dados: 42
Autores: CARON,BRAULIO O.; ELLI,ELVIS F.; BEHLING,ALEXANDRE; ELOY,ELDER; SCHMIDT,DENISE; STOLZLE,JOHN.
Abstract The appropriate choice of tree species and planting arrangement for use in agroforestry systems is very important in order to maximize productivity and sustainability. The aim of this study was to evaluate the growth of five tree species and its effect on sugarcane yields in different planting arrays in agroforestry systems. The study was conducted from 2007 to 2011 in the city of Frederico Westphalen, RS, Brazil. The five studied tree species were: guapuruvu (Schizolobium parahybae), bracatinga (Mimosa scabrella), canafístula (Peltophorum dubium), angico-vermelho (Parapiptadenia rigida) and eucalypt (Eucalyptus urophylla S.T. Blake x Eucalyptus grandis Hill ex Maiden). Root collar diameter, diameter at breast height, plant height and mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Array of plants; Competition; Crown diameter; Height.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502425

Chemical composition and evaluation of antileishmanial and cytotoxic activities of the essential oil from leaves of Cryptocarya aschersoniana Mez. (Lauraceae Juss.)
Provedor de dados: 42
Autores: ANDRADE,PRISCILA M. DE; MELO,DAIANA C. DE; ALCOBA,ANA ELISA T.; FERREIRA JÚNIOR,WALNIR G.; PAGOTTI,MARIANA C.; MAGALHÃES,LIZANDRA G.; SANTOS,TAINÁ C.L. DOS; CROTTI,ANTÔNIO E.M.; ALVES,CASSIA C.F.; MIRANDA,MAYKER L.D.
Abstract Leishmaniasis is an endemic disease caused by protozoa of the genus Leishmania, which affects around two million people worldwide. One major drawback in the treatment of leishmaniasis is the emergence of resistance to current chemotherapeutics. Medicinal and aromatic plants constitute a major source of natural organic compounds. In this study, the leaf essential oil of Cryptocarya aschersoniana was obtained by hydrodistillation in a Clevenger-type apparatus, and the chemical composition was analyzed by GC-MS and GC-FID. The essential oil of these species was predominantly constituted by monoterpene hydrocarbons (48.8%). Limonene (42.3%), linalool (9.7%) and nerolidol (8.6%) were the main constituents in the oil of C. aschersoniana. The in vitro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryptocarya aschersoniana; Lauraceae; Essential oil; Leishmania amazonensis; Cytotoxic activity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602671

Assessment of the scientific-technological production in molecular biology in Brazil (1996-2007): the contribution of genomics programs
Provedor de dados: 42
Autores: Meneghini,Rogério; Gamba,Estêvão C.
Several genome sequencing programs were launched in Brazil by the end of the nineties and the early 2000s.The most important initiatives were supported by the ONSA program (http://watson.fapesp.br/onsa/Genoma3.htm) and aimed at gaining domain in genomic technology and bringing molecular biology to the state of art. Two mainsets of data were collected in the 1996-2007 period to evaluate the results of these genome programs: the scientific production (Scopus and Web of Science databases) and the register of patents (US Patent and Trademark Office), both related to the progress of molecular biology along this period. In regard to the former, Brazil took a great leap in comparison to 17 other developed and developing countries, being only surpassed by China....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Science assessment; Genomics; Scientometrics; Molecular biology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200031

Coexistence of halloysite and kaolinite: a study on the genesis of kaolin clays of Campo Alegre Basin, Santa Catarina State, Brazil
Provedor de dados: 42
Autores: Oliveira,Marisa T.G. de; Furtado,Sandra M.A.; Formoso,Milton L.L.; Eggleton,Richard A.; Dani,Norberto.
Kaolin at Campo Alegre Basin, Santa Catarina State, Brazil was formed from alteration of volcanic acid rocks. Halloysite clays dominate the clay fraction of the matrix of the kaolin body, whereas a poorly crystalline kaolinite is abundant in veins. Some primary blocky structures have high amounts of illite, in one mine, but in general, only low contents of illite-smectite, illite, chlorite-vermiculite, vermiculite and quartz were identified in the clay fraction of the samples. Toward the top of the mines, hematite and lepidocrocite appear in horizontal red and ochre colored levels and the amount of kaolinite increases compared to halloysite. The vertical zoning of alteration levels, the changes in mineralogy, the positive correlation between depth and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kaolinite; Halloysite; Halloysite morphology; Kaolin; Weathering; Clay genesis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400008

Description of the final instar larva of Argia serva Hagen in Selys, 1865 (Odonata Coenagrionidae)
Provedor de dados: 42
Autores: PALACIO,ALEJANDRO DEL; LOZANO,FEDERICO; MUZÓN,JAVIER.
Abstract The American genus Argia, with more than 100 species described, is the most speciose genus of Odonata in the world. In this contribution, the final stadium larva of Argia serva, the southernmost distributed species of Argia, is described and diagnosed based on reared material from Martín García island, Buenos Aires, Argentina. The larva of this species can be easily separated from the other Argentinean Argia by the following combination of characters: sternum of S8 covered with spines (bare in A. translata); antennal segment 3 longer than 1+2 (equal to or shorter than 1+2 in A. joergenseni and A. jujuya); palpal setae absent (present in A. croceipennis). A key to the known larvae of Argia of the Southern Cone is provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argia; Coenagrionidae; Odonata; Zygoptera; Southern Cone.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603017

Geographic variation in skull shape of the water rat Scapteromys tumidus (Cricetidae, Sigmodontinae): isolation-by-distance plus environmental and geographic barrier effects?
Provedor de dados: 42
Autores: QUINTELA,FERNANDO M.; FORNEL,RODRIGO; FREITAS,THALES R.O.
ABSTRACT The geographic variation in skull size and shape of the swamp rat Scapteromys tumidus was examined in samples from eight geographic clusters in almost of its distribution in southern Brazil and Uruguay. For analysis we used two-dimensional geometric morphometric methods for dorsal, ventral and lateral views of the skull. The geometric descriptors showed no significant differences in skull size between geographic clusters, while differences in shape were highly significant. We found a significant and moderate correlation between geographic and morphological distances, corroborating the isolation-by-distance model. Samples from the Rio Grande do Sul central coastal plain were the most differentiated, segregating completely from all other samples in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Akodontini; Isolation-by-distance; Geometric morphometrics; Skull morphology; Pampa.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200451

Cohort study of cardiovascular risk in asymptomatic young adults: subclinical atherosclerosis and coronary calcium score
Provedor de dados: 42
Autores: POLETTO,SADI; SCHVARTZMAN,PAULO R.; BRUSCATO,NEIDE M.; MORIGUCHI,EMILIO.
Abstract Coronary artery calcification is an early marker of subclinical atherosclerosis, but little research has been done in asymptomatic individuals under 45 years. In this cohort study with 17 years of follow-up, 155 participants were assessed in 2016 with a coronary calcium score for the association with cardiovascular risk factors. During follow-up, there was a significant increase in anthropometric measurements, cholesterol and fractions, and diastolic pressure. Participants who gained 1 cm in waist circumference had a mean reduction of 0.36 mg/dL in HDL-cholesterol and those who gained 1 kg/m2 in body mass index had a reduction of 0.72 mg/dL in HDL-cholesterol. Married participants had a 4.78 mg/dL reduction in HDL-cholesterol levels compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular disease; Coronary calcium score; Subclinical atherosclerosis; Cohort study.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603129

Hepatoprotective, cardioprotective, and renal-protective effects of organic and conventional grapevine leaf extracts (Vitis labrusca var. Bordo) on Wistar rat tissues
Provedor de dados: 42
Autores: Oliboni,Lívia S.; Dani,Caroline; Funchal,Cláudia; Henriques,João A.; Salvador,Mirian.
The purpose of this study was to evaluate the beneficial effects of organic and conventional grapevine (Vitis labrusca L.) leaf extracts in reducing hydrogen peroxide-induced stress in the liver, heart and kidney of Wistar rats by measuring lipids and proteins damages (carbonyl assay), as well as the activity of the antioxidant enzymes superoxide dismutase and catalase. The preincubation with 5 mg/mL of organic and conventional grapevine (Vitis labrusca L.) leaf extracts prevented both lipids and proteins oxidative damages in all tissues analyzed. The organic leaf extract was able to restore superoxide dismutase (kidney and liver) and catalase (heart) activities, which were modified by the treatment with H2O2. The conventional extract was able to restore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant activity; Grapevine leaves; Hepatoprotective; Cardioprotective; Renal-protective; Vitis labrusca.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400027

Trap nest preference of solitary bees in fragments of the Baturité massif, Atlantic Forest, Brazil
Provedor de dados: 42
Autores: GUIMARÃES-BRASIL,MICHELLE O.; BRASIL,DANIEL F.; PACHECO-FILHO,ALÍPIO J.S.; SILVA,CLÁUDIA I.; FREITAS,BRENO M.
Abstract  The study investigated native solitary bee species that nest in pre-existing cavities in the Baturité Massif, State of Ceará, Brazil, their preference for nest substrates and aspects of these bee communities. Samples were taken in four distinct areas of the Baturité Massif using three types of trap-nests: dried bamboo internodes, cardboard tubes and rational boxes. Out of the 185 nests offered, 34 were colonized and 24 of them produced 131 bees, belonging to two families (Apidae and Megachilidae) and five genera (Centris, Mesocheira, Euglossa, Megachile and Coelioxys) from six species, including parasitic ones. Nesting preference was observed to certain types of substrates (χ²=17.89, p&lt;0.001), with bamboo internodes being preferred by bee to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apidae; Emergence; Megachilidae; Trap-nest.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201005

Improvement on the concentrated grape juice physico-chemical characteristics by an enzymatic treatment and Membrane Separation Processes
Provedor de dados: 42
Autores: CAMPOS,PLÍNIO R.F.; MÓDENES,APARECIDO N.; ESPINOZA-QUIÑONES,FERNANDO R.; TRIGUEROS,DANIELA E.G.; BARROS,SUELI T.D.; PEREIRA,NEHEMIAS C.
ABSTRACT In this work, the improvement on the concentrated grape juice physico-chemical characteristics by using an enzymatic treatment followed by Membrane Separation Process (MSP) has been investigated. By using Novozym 33095(r) and Ultrazym AFP L(r) enzymes varying three operating parameters, the best result on the grape pulp characteristics was attained for the Novozym 33095(r) performed at 35oC, 15 min. and 50 mgL-1. In micro/ultra filtration processes after enzymatic pretreatment, the best performance of the MSP with high permeate flux value and suitable grape juice characteristics was attained using 0.05 mm membrane pore size, 1 bar pressure and 40 oC treatment temperature. When reverse osmosis process is operated at 40 bar and 40oC, high soluble...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grape juice; Enzymatic treatment; Micro/ultra filtration; Reverse osmosis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100423

Morphological Characterization of Diaphragm in Common Squirrel Monkey (Saimiri sciureus)
Provedor de dados: 42
Autores: SOUZA NETO,JOSÉ RICARDO N. DE; BRANCO,ÉRIKA; GIESE,ELANE G.; LIMA,ANA RITA DE.
ABSTRACT The wall of the diaphragm can be affected by congenital or acquired alterations which allow the passage of viscera between the abdominal and chest cavities, allowing the formation of a diaphragmatic hernia. We characterized morphology and performed biometrics of the diaphragm in the common squirrel monkey Saimiri sciureus. After fixation, muscle fragments were collected and processed for optical microscopy. In this species the diaphragm muscle is attached to the lung by phrenopericardial ligament. It is also connected to the liver via the coronary and falciform ligaments. The muscle is composed of three segments in total: 1) sternal; 2) costal, and 3) a segment consisting of right and left diaphragmatic pillars. The anatomical structures analyzed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diaphragmatic hernia; Morphology; Saimiri sciureus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100169

Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil
Provedor de dados: 42
Autores: Ferreira,Ana C.M.; Ferreira,Valderez P.; Soares,Dwight R.; Vilarroel-Leo,Hugo S.
The Alto Quixaba pegmatite, Seridó region, northeastern Brazil, is a 60º/80ºSW-trending subvertical dike discordantly intruded into biotite schists of the Upper Neoproterozoic Seridó Formation. It has three distinct mineralogical and textural zones, besides a replacement body that cuts the pegmatite at its central portion and in which occur, among other gem minerals, colored elbaites. Elbaites usually occur as prismatic crystals, elongate according to the c-axis, with rounded faces and striations parallel to this axis. Optically, crystals are uniaxial negative with strong pleochroism; refractive index extraordinary axis = 1.619-1.622 and ordinary axis = 1.639-1.643, birefringence between 0.019 and 0.021, average relative density of 3.07, and the following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elbaite; Tourmaline; Seridó pegmatitic province.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400011

Insulin-like Growth Factor 1 gene polymorphism and breast cancer risk
Provedor de dados: 42
Autores: COSTA-SILVA,DANYLO R.; BARROS-OLIVEIRA,MARIA DA CONCEIÇÃO; BORGES,RAFAEL S.; TAVARES,CLÉCITON B.; BORGES,UMBELINA S.; ALVES-RIBEIRO,FRANCISCO A.; SILVA,VLADIMIR C.; SILVA,BENEDITO B. DA.
ABSTRACT Insulin-like Growth Factor-1 (IGF-1) gene polymorphism has been associated with an increased risk for breast cancer. IGF-1 is a key regulator of proliferation, cell differentiation and apoptosis. It has important mitogenic and anti-apoptotic activities in normal cells and in breast cancer cells, acting synergistically with estrogen to increase neoplastic cell proliferation. This review aims to present the recent finds of IGF-1 gene polymorphism and its relationship with the risk of breast cancer through following the polymorphic dinucleotide repeat cytosine-adenine (CA) and single nucleotide polymorphisms (SNPs) by searching in the PubMed database publications focused studies published from 2010 to 2015 related to IGF-1 gene polymorphism and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breast cancer; Risk factors; IGF-1; IGF-1 gene polymorphism.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602349

Quantification and classification of the main environmental impacts on a Halodule wrightii seagrass meadow on a tropical island in northeastern Brazil
Provedor de dados: 42
Autores: Pitanga,Maria Elisa; Montes,Manuel J.F.; Magalhães,Karine M.; Reis,Thiago N.V.
Multiple stress mechanisms have caused a worldwide decrease in seagrasses, which are vulnerable to environmental and/or anthropogenic pressure. The loss of seagrass meadows of Halodule wrightii is reported for the littoral of Itamaracá Island (Northeastern Brazil). The present study identified the main anthropogenic factors that negatively influenced over the abundance and distribution of seagrass meadows between July and September 2007 at the Jaguaribe and Pilar Beaches, Eastern littoral of Itamaracá. Anthropogenic impact included the discharge of untreated sewage through fluvial channels, urban and commercial development along the coast, the anchoring of motorized and non-motorized boats, diverse fishing techniques and the dumping of solid waste. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Ecological value; Habitat loss; Marine habitat.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100005

Responses of riffle beetle assemblages to deforestation in a semi-deciduous Atlantic Forest remnant
Provedor de dados: 42
Autores: BRAUN,BRUNA M.; BERTASO,TIAGO R.N.; PIRES,MATEUS M.; SPIES,MARCIA R.; KOTZIAN,CARLA B.
Abstract Deforestation affects freshwater assemblages since aquatic organisms are dependent on the structure of the riparian vegetation. To investigate the responses of riffle beetles (Elmidae) to deforestation, this study assessed the structure of riffle beetle assemblages found in streams running through a large and well-preserved semi-deciduous Atlantic Forest remnant in Southern Brazil and in nearby deforested areas. Additionally, the effects of different substrate types (litter and stone) on the assemblages were assessed. Riffle beetle assemblages showed a remarkably distinct structure between forested and deforested areas. Lower abundance occurred in deforested streams. Indicator genera of forested streams were detected (e.g.,Macrelmis and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coleoptera; Converted areas; Elmidae; Forest integrity; Riparian vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502189

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)
Provedor de dados: 42
Autores: BURONE,LETICIA; MUNIZ,PABLO; PIRES-VANIN,ANA MARIA S.; RODRIGUES,MARCELO.
Analyses of organic matter content, organic carbon, nitrogen, sulfur and granulometric variables were performed on 101 surface sediment samples from Ubatuba Bay in order to investigate the spatial distribution of organic matter, its origin and the relationships among its components. The samples were obtained with a manual corer, from water depths between 1 and 15m during 5 cruises of the R/V "Veliger II'', two months apart. Pearson correlation, regression and Principal Component Analysis (PCA) statistical methods were used to analyze the data. Strong correlations between organic matter and fine sediment fractions were obtained. The PCA revealed at least two main sample groups that reflect the different environmental conditions prevalent in the bay. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Sediment; C/N ratio; Ubatuba; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100009

Potential of East African phosphate rock deposits in integrated nutrient management strategies
Provedor de dados: 42
Autores: Jama,Bashir; Van Straaten,Peter.
Phosphorus deficiency affects around 80% of the acid soils of western Kenya, but fertilizer use is limited due to high prices. This paper explores the potential of local phosphate rocks (PR) as a remedy within the context on an integrated soil fertility management approach. A promising phosphate rock is Minjingu PR (MPR, Tanzania), a sedimentary/biogenic deposit which contains about 13% total P and 3% neutral ammonium citrate (NAC) soluble P. On-farm trials in P-deficient soils in western Kenya demonstrate MPR to be as effective as triple superphosphate (TSP, 20% P) at equal P rates. The benefits are most pronounced with the integration of agroforestry technologies that improve soil fertility. Besides Minjingu PR, Busumbu PR from Uganda (BPR) is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizers; Maize; Improved fallows; Tithonia; East Africa.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400012

Standardization of a method to study angiogenesis in a mouse model
Provedor de dados: 42
Autores: FEDER,DAVID; PERRAZO,FABIO F.; PEREIRA,EDIMAR C.; FORSAIT,SILVANA; FEDER,CECíLIA K.R.; JUNQUEIRA,PAULO E.B.; JUNQUEIRA,VIRGINIA B.C.; AZZALIS,LIGIA A.; FONSECA,FERNANDO L.A.
In the adult organism, angiogenesis is restricted to a few physiological conditions. On the other hand, uncontrolled angiogenesis have often been associated to angiogenesis-dependent pathologies. A variety of animal models have been described to provide more quantitative analysis ofin vivo angiogenesis and to characterize pro- and antiangiogenic molecules. However, it is still necessary to establish a quantitative, reproducible and specific method for studies of angiogenesis factors and inhibitors. This work aimed to standardize a method for the study of angiogenesis and to investigate the effects of thalidomide on angiogenesis. Sponges of 0.5 x 0.5 x 0.5 cm were implanted in the back of mice groups, control and experimental (thalidomide 200 mg/K/day by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angiogenesis model; Hemoglobin measurement; Sponge implant; Thalidomide.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401483

Brief review of dinosaur studies and perspectives in Brazil
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A.
Dinosaur research is developing at very high rates around the world resulting in several new discoveries that are improving our understanding of this terrestrial reptilian clade. Except for the last couple years, the studies of Brazilian dinosaurs have not followed this expansive trend, despite the high potential of several dinosaur localities. So far there are only eight described taxa, four in the last year, representing theropod, sauropod, and one possible prosauropod taxa. Except for footprints, there are no records of ornithischian dinosaurs in the country what is at least partially explainable by the lack of continuous vertebrate fossil collecting program in the country. More funding is necessary to improve the research activities in this field.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleontology; Dinosauria; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400005

Bio-ecological aspects of the hermit crab Paguristes calliopsis (Crustacea, Diogenidae) from Anchieta Island, Brazil
Provedor de dados: 42
Autores: Biagi,Renata; Meireles,Andrea L.; Mantelatto,Fernando L.
In southern Atlantic studies on hermit crab biology are scanty considering the local biodiversity. In this way, some population features of Paguristes calliopsis Forest and Saint Laurent, 1968 such as size frequency distribution, sex ratio and shell occupation in the natural environment were studied. Specimens were collected by means of scuba methods in the infralittoral area of the Anchieta Island. A total of 116 individuals were analyzed. Size measurements (minimum; maximum; mean shield length ± sd, respectively) were 0.8; 4.5; 2.76 ± 0.79 mm for males and 2.28 ± 0.36 mm for females. The sex ratio was 1.47:1 in favor of males which prevailed in the largest size classes. The hermit crabs occupied shells from eleven gastropod species and Cerithium atratum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diogenidae; Paguristes; Population; Shell occupation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300006

On Gymnodactylus amarali Barbour, 1925, with the description of a new species (Sauria, Gekkonidae)
Provedor de dados: 42
Autores: Vanzolini,Paulo Emilio.
Gymnodactylus amarali Barbour, 1925, was previously considered to be a subspecies of G. geckoides, with a wide distribution in the Brasilian cerrados. Examination of a specimen from Alto Parnaíba, Maranhão, near the type locality (Engenheiro Dodt, Piauí), indicates that it is a proper species, apparently limited to the upper Parnaíba basin. The form previously identified as G. geckoides amarali is described as a new species, G. carvalhoi, type locality Ipueiras, State of Tocantins, thus diagnosed: color pattern plain or, more often, with moderately contrasted ocelli; dorsal tubercles in 13 - 16 poorly organized longitudinal rows (mode 14, 72%); 31 - 49 tubercles in a paramedian row; 17 - 22 transverse rows of ventral scales; 13 - 18 infradigital lamellae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Speciation; Lizards/systematics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400003

Behavior and performance of sows fed different levels of fiber and reared in individual cages or collective pens
Provedor de dados: 42
Autores: BUDIÑO,FÁBIO E.L.; VIEIRA,RENATA F.N.; MELLO,SILVIO P.; DUARTE,KEILA M.R.
Sixteen pregnant sows were used. The experimental design was completely randomized with a 2x2 factorial scheme consisting of two housing systems (individual cages and collective pens) and two diets (low [2.67%] and high [13.14%] level of crude fiber). Physiological, behavioral, environmental, and hormonal parameters were studied. In addition, the following productive and reproductive parameters were evaluated: weight gain, feed intake, feed conversion of the sow and piglets, number of piglets born dead and alive, number and weight at weaning, and backfat thickness of sows. Pregnant sows reared in collective pens and fed a high-fiber diet exhibited better physiological responses, indicating greater comfort and better animal welfare. The environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Swine; Animal welfare; Environmental enrichment; Housing systems.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402109

Post-embriononic development of Chrysomya putoria(Diptera: Calliphoridae) on a diet containing ampicillin in different concentrations
Provedor de dados: 42
Autores: FERRAZ,ADRIANA C.P.; DALLAVECCHIA,DANIELE L.; SILVA,DÉBORA C.; SILVA-FILHO,RENATO G.; AGUIAR,VALÉRIA M.
Here we evaluate the effects of different concentrations of the antibiotic ampicillin on the growth and development of Chrysomya putoria. Third-generation, first instar larvae (L1) reared on 60 grams of homogenate+agar 65% were treated with ampicillin sodium. The experiment consisted of four replicates (40 larvae/replicate) of each antibiotic concentration tested (T1: 466µg/mL ; T2: 81.33 mg/mL and T3: 166.66mg/mL) and a T4: control. The body mass of the mature larvae, after they abandoned the diet, were recorded in batches of five. The variation between the mean body mass of larvae and the duration of larval and pupal stages, and overall duration of the development, viability and normal rates were analyzed by ANOVA. There were no significant differences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ampicillin; Biology; Bowfly; Callihoridae; Forensic entomology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100105

Plant Bugs Predators (Hemiptera: Heteroptera: Miridae) with References to Arthropods and Fungi in Brazil
Provedor de dados: 42
Autores: NOGUEIRA,BÁRBARA C.F.; FERREIRA,PAULO S.F.; COELHO,LÍVIA A.; MARTINS,DAVID S.; BARCELLOS,BÁRBARA D.
Abstract: The present study demonstrates 30 plant bugs species associated with 50 records of prey and six records of mycophagy for Brazil. The data were compiled from Schuh’s Catalog, the literature, specimens deposited in entomology museums and exemplars from different regions of Brazil sent for identification. Some of the data from the literature used did not presented complete information. This study aims to increase the knowledge of the relationships among plant bugs, prey and fungi and emphasize those species with potential for biological control strategies and pest integrated management.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arthropod; Fungi; Insect; Prey.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500608

Hematological parameters of Iranian cichlid Iranocichla hormuzensis: Coad, 1982 (Perciformes) in Mehran River
Provedor de dados: 42
Autores: Daneshvar,Ehsan; Ardestani,Mahsa Y.; Dorafshan,Salar; Martins,Mauricio L.
This study describes the hematological parameters in Iranocichla hormuzensis, an Iranian freshwater cichlid important as ornamental and food fish. Forty fish were captured with seine net at Mehran river Hormozgan province, Iran. Blood was used to determine the total counts of red blood cells (RBC) and white blood cells (WBC), hematocrit, mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC) and morphometric data of erythrocytes. The Iranian fish showed lower RBC and WBC values than the other cichlids (Oreochromis niloticus, O. aureus, O. mossambicus, O. hybrid, Cichlasoma dimerus and Cichla monoculus). Hematocrit did not vary among the species, but MCV, MCH and MCHC in I. hormuzensis were higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cichlidae; Iran; Hematology; Erythrocytes.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400009

Multivariate optimization of an ultrasound-assisted extraction procedure for Cu, Mn, Ni and Zn determination in ration to chickens
Provedor de dados: 42
Autores: BARROS,JOÉLIA M.; BEZERRA,MARCOS A.; VALASQUES,GISSELI S.; NASCIMENTO JÚNIOR,BARAQUÍZIO B. DO; SOUZA,ANDERSON S.; ARAGÃO,NÁDIA M. DE.
In this work, multivariate optimization techniques were used to develop a method based on the ultrasound-assisted extraction for copper, manganese, nickel and zinc determination from rations for chicken nutrition using flame atomic absorption spectrometry. The proportions of extracting components (2.0 mol.L–1 nitric, hydrochloric and acetic acid solutions) were optimized using centroid-simplex mixture design. The optimum proportions of this mixture taken as percentage of each component were respectively 20%, 37% and 43%. Variables of method (sample mass, sonication time and final acid concentration) were optimized using Doehlert design. The optimum values found for these variables were respectively 0.24 g, 18s and 3.6 mol.L–1. The developed method allows...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rations to chicken; Ultrasound-assisted extraction; Mixture design; Doehlert design; Metals.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300891

Establishment of an environmental microbiological monitoring program in a mice barrier facility
Provedor de dados: 42
Autores: SCHLAPP,GERALDINE; FERNÁNDEZ-GRAÑA,GABRIEL; ARÉVALO,ANA PAULA; CRISPO,MARTINA.
Abstract Rodents used in biomedical research are maintained behind barriers to exclude microbial contaminants. Several check points have to be monitored to eliminate the potential of introducing adventitious agents into the facility. Microbiological monitoring of a mouse facility environment enables to evaluate the efficiency of sanitization and cleaning procedures, air quality, and technician good practices. At our SPF mouse facility, we implemented an environmental microbiological monitoring program based in sedimentation and swabbing, inexpensive and easy to use methods. The aim of this work was to evaluate the results and the efficiency of the monitoring program after seven years. The median for bacteria and fungi counts in the SPF sampled areas was ≤2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental microbiological monitoring program; Health monitoring; Settle plates; SPF mice facility; Swabbing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603155

Discovering information through virtual reality
Provedor de dados: 42
Autores: Frery,Alejandro C.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400034

A study of structural lineaments in Pantanal (Brazil) using remote sensing data
Provedor de dados: 42
Autores: PARANHOS FILHO,ANTONIO C.; NUMMER,ALEXIS R.; ALBREZ,EDILCE A.; RIBEIRO,ALISSON A.; MACHADO,RÔMULO.
This paper presents a study of the structural lineaments of the Pantanal extracted visually from satellite images (CBERS-2B satellite, Wide Field Imager sensor, a free image available in INTERNET) and a comparison with the structural lineaments of Precambrian and Paleozoic rocks surrounding the Cenozoic Pantanal Basin. Using a free software for satellite image analysis, the photointerpretation showed that the NS, NE and NW directions observed on the Pantanal satellite images are the same recorded in the older rocks surrounding the basin, suggesting reactivation of these basement structural directions during the Quaternary. So the Pantanal Basin has an active tectonics and its evolution seems to be linked to changes that occurred during the Andean subduction.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Free remote sensing software; Free satellite images; Structural geology; Lineaments; Photointerpretation; Pantanal.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300913

Monoicy in A. angustifolia (Bert.) O. Kuntze (Araucariaceae): I. Morphological aspects of the reproductive structures
Provedor de dados: 42
Autores: Stefenon,Valdir M.; Caprestano,Clarissa A.
Araucaria angustifolia (Bert.) O. Kuntze is a dioecious conifer species native of Brazil. The rare occurrence of monoiceous specimens have been attributed to pathogenic infections or other injuries in adult trees. Here, the morphological characteristics of male and female cones and pollen grains of a monoiceous A. angustifolia are described. Male and female cones and pollen grains presented normal morphology, lacking any sort of injuries or infection and suggesting the existence of further grounds for the occurrence of monoicy in this conifer species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria; Sexual system; Brazilian pine.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400009

Clusia criuva Cambess. (Clusiaceae): anatomical characterization, chemical prospecting and antioxidant activity
Provedor de dados: 42
Autores: SILVA,KARLA M.M. DA; NÓBREGA,ANDREA B. DA; LESSA,BRUNO; ANHOLETI,MARIA CAROLINA; LOBÃO,ADRIANA Q.; VALVERDE,ALESSANDRA L.; PAIVA,SELMA R. DE; JOFFILY,ANA.
ABSTRACT This study aims the anatomical description and chemical characterization of aerial parts of Clusia criuva Cambess., Clusiaceae in addition to the evaluation of the antioxidant activity of crude extracts, correlated to the flavonoid content. The morphological characterization was performed using traditional techniques of plant anatomy. For phytochemical studies, crude extracts were obtained by static maceration and analyzed by thin layer chromatography. The antioxidant activity and the flavonoids content were determined by colorimetric methods involving, respectively, 2,2-diphenyl-1-picrylhydrazyl free radical and aluminum chloride. C. criuva has uniseriate epidermis, paracytic stomata, hypostomatic leaves, cuticular flanges and cordiform vascular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphoanatomy; Antioxidant activity; Chemical prospecting; Clusia criuva; Clusiaceae; Flavonoids.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401565

Plant densities and harvesting times on productive and physiological aspects of Stevia rebaudiana Bertoni grown in southern Brazil
Provedor de dados: 42
Autores: GOMES,ERIK N.; MOTERLE,DIEGO; BIASI,LUIZ ANTONIO; KOEHLER,HENRIQUE S.; KANIS,LUIZ ALBERTO; DESCHAMPS,CÍCERO.
Abstract Stevia (stevia rebaudiana Bertoni) is a species characterized by producing non-caloric substances with high sweetening potential. Among these substances, rebaudioside A and stevioside are produced in greater quantity. Plant density and harvesting time are factors that affects biomass and sweetening compounds yield in this species. The objective of this research was to evaluate the effect of plant densities and harvesting times on the productive and physiological characteristics of stevia in southern Brazil. The experimental design was in randomized blocks, in a split-plot scheme, with 9 treatments comparing the effect of three planting densities (166 667, 83 333 and 33 333 plants ha-1) in the plots and three harvesting periods (before, in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diterpene glycosides; Natural sweetener; Rebaudioside A; Stevioside.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703249

Characterization of DNA polymorphisms in Caryocar brasiliense (Camb.) in populations with and without thorn at the endocarp by RAPD markers
Provedor de dados: 42
Autores: Londe,Luciana N.; Ueira-Vieira,Carlos; Kerr,Warwick E.; Bonetti,Ana Maria.
Caryocar brasiliense (pequi), is one of the main species at the biome of the Brazilian savannah due to its use in culinary, popular medicine, industry in general, and iron and steel industry. At São José do Xingu (MT), a tree of C. brasiliense without thorn at the endocarp was found, which enables the improvement of C. brasiliense not only for consumption but also to the high appreciation it already has. To detect the existing differences between the pequi with and without the thorn at the endocarp, RADP markers were used. The generated polymorphisms were cloned and sequenced in order to identify the sequences that are responsible for the fenotypical alteration. It was observed that the pequi without thorn is genetically isolated from the other populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caryocar brasiliense; Pequi; Thorn; RAPD.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300024

Occurrence of Dendrocephalus brasiliensis Pesta, 1921 (Crustacea, Anostraca) in the Caras river, southern Ceara, Brazil
Provedor de dados: 42
Autores: FREITA,FRANCISCO R.V.; LUCENA,,ISIS C. DE; ALENCAR,,DAMARES R.; SANTOS,ISRAEL J.M.; PINHEIRO,ALLYSSON P.
ABSTRACT Occurrence of Dendrocephalus brasiliensis Pesta, 1921 (Crustacea, Anostraca) in the Caras river, southern Ceara, Brazil. The specimens were collected in March and April 2014. The new occurrence extends the distribution and update area of occupancy of the species, which is characterized by a specific habitat: temporary lakes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Branchiopoda; Fairy shrimp; Aquiculture; Fresh water.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301047

Discovery and characterization of SSR markers in Eugenia uniflora L. (Myrtaceae) using low coverage genome sequencing
Provedor de dados: 42
Autores: SARZI,DEISE S.; JUSTOLIN,BEATRIZ; SILVA,CLARIANE DA; LEMOS,RAFAEL P.M.; STEFENON,VALDIR MARCOS.
Abstract: Eugenia uniflora L. (Myrtaceae) is a tree species widely distributed in South America suffering the effects of the exploitation of natural populations. In this study, we employed low coverage sequencing of the E. uniflora genome for mining of SSR markers. The de novo assembly generated 2,601 contigs with an average length of 1139 bp and spans 3.15 Mb. A total of 76 dimer, 33 trimer and two compound SSR loci were identified. Twelve selected SSR loci were employed to genotype 30 individuals from two natural populations. A total of 73 alleles were detected (mean A= 6.1) were observed, the mean effective number of alleles was Ae = 3.91, mean Ho was 0.23 and mean HE was 0.70). The mean Wright’s within population fixation index was FIS = 0.66 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Next generation sequencing; Pitanga; Population genetics; SSR; Surinam-cherry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100625

Evaluation antibacterial and antibiofilm activity of the antimicrobial peptide P34 against Staphylococcus aureus and Enterococcus faecalis
Provedor de dados: 42
Autores: COSTA,GÉSSICA A.; ROSSATTO,FERNANDA C.P.; MEDEIROS,ALINE W.; CORREA,ANA PAULA F.; BRANDELLI,ADRIANO; FRAZZON,ANA PAULA G.; MOTTA,AMANDA DE S. DA.
ABSTRACT The adhesion ability of bacteria to abiotic surfaces has important implications in food industries, because these organisms can survive for long periods through the biofilm formation. They can be transferred from one place to another in the industry causing contamination of the food processing environment. In this study, the antibacterial and antibiofilm activities of the antimicrobial peptide P34, characterized as a bacteriocin-like substance (BLS P34) were tested against planktonic and sessile cells of Staphylococcus aureus and Enterococcus faecalis isolated from foods. The BLS P34 showed inhibitory effect against all planktonic cells of E. faecalis. The inhibition of biofilm formation and the eradication of pre-formed biofilm were evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofilm; Crystal violet; Food industry; MTT assay; Peptide P34.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100073

Genetic variation in native and farmed populations of Tambaqui (Colossoma macropomum) in the Brazilian Amazon: regional discrepancies in farming systems
Provedor de dados: 42
Autores: Aguiar,Jonas; Schneider,Horacio; Gomes,Fátima; Carneiro,Jeferson; Santos,Simôni; Rodrigues,Luis R.; Sampaio,Iracilda.
The tambaqui, Colossoma macropomum, is the most popular fish species used for aquaculture in Brazil but there is no study comparing genetic variation among native and farmed populations of this species. In the present study, we analyzed DNA sequences of the mitochondrial DNA to evaluate the genetic diversity among two wild populations, a fry-producing breeding stock, and a sample of fish farm stocks, all from the region of Santarém, in the west of the Brazilian state of Pará. Similar levels of genetic diversity were found in all the samples and surprisingly the breeding stock showed expressive representation of the genetic diversity registered on wild populations. These results contrast considerably with those of the previous study of farmed stocks in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tambaqui; Mitochondrial DNA; Genetic variability; Aquaculture.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401439

Publications in the field of Agrarian Sciences in the Anais da Academia Brasileira de Ciências: what next?
Provedor de dados: 42
Autores: Azevedo,Ricardo A.
Tipo: Info:eu-repo/semantics/other
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100001

Mathematic model of three-phase induction machine connected to advanced inverter for traction system for electric trolley
Provedor de dados: 42
Autores: BOCII,LIVIU S.; MULLER,VALENTIN.
This paper establishes a mathematical model of induction machine connected to a frequency inverter necessary to adjust the electric motor drive. The mathematical model based on the Park's theory allows the analysis of the whole spectrum (electric car – frequency inverter) to drive the electric trolley bus made on ASTRA Bus Arad (Romania). To remove higher order harmonics, the PWM waveform of supply voltage is used, set in the general case. Operating characteristics of electric motor drive are set to sub-nominal frequency (f &lt; 50 Hz) and for different angles of the control switching elements in the construction of the inverter. Tensions in the stator of the equivalent machine are determined by three components: the fundamental component; the second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Induction engine; Operating characteristics; Mathematic model; Trolley bus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200849

Anthraquinones from the bark of Senna macranthera
Provedor de dados: 42
Autores: Branco,Alexsandro; Pinto,Angelo C.; Schripsema,Jan; Braz-Filho,Raimundo.
2-acetyl physcion (2-acetyl-1,8-dihydroxy-6-methoxy-3-methyl-9,10-anthraquinone, 2), a rare anthraquinone, was isolated from Senna macranthera var. nervosa (Vogel) H.S. Irwin &amp;amp; Barneby (Fabaceae). The chemical structure was elucidated and all ¹H and 13C NMR chemical shifts were assigned by NMR one- (¹HNMR, {¹H}-13CNMR, and APT-13CNMR) and two (COSY, NOESY, HMQC and HMBC) dimensional of this natural compound. Furthermore, the minor anthraquinones chrysophanol (3), chrysophanol-8-methyl ether (4) and physcion (5) were characterized by GC-MS analysis. The occurrence of the anthraquinones 3-5 confirms that S. macranthera is a typical representative of the genus Senna.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthraquinone; 2-acetyl-physcion; Fabaceae; Senna acranthera.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400003

Pathogenic Vibrio species isolated from estuarine environments (Ceará, Brazil) - antimicrobial resistance and virulence potential profiles
Provedor de dados: 42
Autores: MENEZES,FRANCISCA G.R. DE; RODRIGUEZ,MARINA T.T.; CARVALHO,FÁTIMA C.T. DE; REBOUÇAS,ROSA H.; COSTA,RENATA A.; SOUSA,OSCARINA V. DE; HOFER,ERNESTO; VIEIRA,REGINE H.S.F.
ABSTRACT Detection of virulent strains associated with aquatic environment is a current concern for the management and control of human and animal health. Thus, Vibrio diversity was investigated in four estuaries from state of Ceará (Pacoti, Choró, Pirangi and Jaguaribe) followed by antimicrobial susceptibility to different antimicrobials used in aquaculture and detection of main virulence factors to human health. Isolation and identification were performed on TCBS agar (selective medium) and dichotomous key based on biochemical characteristics, respectively. Nineteen strains of genus Vibrio were catalogued. Vibrio parahaemolyticus (Choró River) and V. alginolyticus (Pacoti River) were the most abundant species in the four estuaries. All strains were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vibrio spp.; Pathogen; Estuaries; Public health; Water.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301175

Branching, flowering and fruiting of Jatropha curcas treated with ethephon or benzyladenine and gibberellins
Provedor de dados: 42
Autores: Costa,Anne P.; Vendrame,Wagner; Nietsche,Sílvia; Crane,Jonathan; Moore,Kimberly; Schaffer,Bruce.
Jatropha curcas L. has been identified for biofuel production but it presents limited commercial yields due to limited branching and a lack of yield uniformity. The objective of this study was to evaluate the effects of single application of ethephon or a combination of 6-benzyladenine (BA) with gibberellic acid isomers A4 and A7 (GA4+7) on branch induction, flowering and fruit production in jatropha plants with and without leaves. Plants with and without leaves showed differences for growth and reproductive variables. For all variables except inflorescence set, there were no significant statistical interactions between the presence of leaves and plant growth regulators concentration. The total number of flowers per inflorescence was reduced as ethephon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BA + GA4 + 7; Branching; Ethephon; Flowering; Fruiting; Jatropha.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300989

Nonylphenol: Properties, legislation, toxicity and determination
Provedor de dados: 42
Autores: ARAUJO,FREDERICO G. DE; BAUERFELDT,GLAUCO F.; CID,YARA PELUSO.
ABSTRACT This paper aims to gather and discuss important information about nonylphenol, such as physical chemistry properties, toxicity and analytical methods in various matrices. As a degradation product of ethoxylated alkylphenols, nonylphenol presents a higher degree of reactivity than its precursor. Due to its harmful effects on the environment, use and production of nonylphenol has been banned in European Union countries, alongside their precursors. The guide on quality of drinking water (USEPA) recommends a maximum concentration of 28 µg L-1 for fresh water. In Brazil, there is no clear legislation containing values ​​of maximum concentration of nonylphenol. Due to this lack of regulation, a continuous monitoring is necessary of this pollutant in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonylphenol; Endocrine disrupter; Pollutant; Water analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501903

The two most important lateritization cycles in the Amazon region and their paleoecological importance
Provedor de dados: 42
Autores: COSTA,MARCONDES L. DA.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300014

Bryophyte communities across the ecological succession process in the Caxiuanã National Forest, Pará, Brazil
Provedor de dados: 42
Autores: TAKASHIMA-OLIVEIRA,TÁSSIA T.G.; MEDEIROS,PRISCILA S. DE; TAVARES-MARTINS,ANA CLÁUDIA C.
Abstract  Bryophytes play an important role in the process of ecological succession: conditioning the environment favourably for the emergence of subsequent groups. The objective of this study was to investigate the distribution of bryophyte communities in a cronossequence in the Caxiuanã National Forest, Pará, Brazil. To this end, biological material was collected in forest remnants with different successional stages based on regeneration age: Stage I (0 – 10 years), Stage II (10 - 25), Stage III (&gt; 25) and Stage IV (primary forests). Density, richness and composition of species were compared between successional stages and the occurrence of possible indicator-species was investigated. The identified taxa were also classified by guilds of tolerance to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon rainforest; Cryptogams; Forest regeneration; Secondary forest.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100714

Neonatal lupus syndrome: the heart as a target of the immune system
Provedor de dados: 42
Autores: GARCIA,SIMONE; CAMPOS-DE-CARVALHO,ANTONIO C.
Neonatal lupus erythematosus (NLE) is an auto-immune disease related to systemic lupus erythematosus (SLE). Unlike SLE it is not a spontaneous syndrome but rather an acquired one. In NLE the most common disease manifestations are a transient cutaneous lesion and cardiac conduction disturbances. The cutaneous lesions and other non-cardiac manifestations of NLE are transient and disappear about six months after birth, at the time when maternal antibodies disappear from the neonatal circulation. This fact suggests that maternal antibodies may cross the placenta leading to an inflamatory reaction in the fetal tissues. NLE is the principal cause of atria-ventricular block, when it is not associated with congenital birth defects. All the clinical studies to date...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neonatal lupus; Auto-immunity; Heart blockade; Anti-Ro/SSA antibodies.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100012

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
Provedor de dados: 42
Autores: Guimarães,André L.; Dieguez,Lídia C.; Schmal,Martin.
The influence of the precursors on the promoting effect of ceria on Pd/Al2O3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS). XPS and DRS results show that PdO/Pd0 interface are the active sites independent of the precursor, while the catalysts containing CeO2 showed formation of palladium species in the highest oxidation state, probably PdO2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO2. In addition, the precursor acetylacetonate favors the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palladium; Cerium oxide; Precursors; Characterization.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400014

Interactive effects of genotype x environment on the live weight of GIFT Nile tilapias
Provedor de dados: 42
Autores: OLIVEIRA,SHEILA N. DE; RIBEIRO,RICARDO P.; OLIVEIRA,CARLOS A.L. DE; ALEXANDRE FILHO,LUIZ; OLIVEIRA,ALINE M.S.; LOPERA-BARRERO,NELSON M.; SANTANDER,VICTOR F.A.; SANTANA,RENAN A.C.
ABSTRACT In this paper, the existence of a genotype x environment interaction for the average daily weight in GIFT Nile tilapia (Oreochromis niloticus) in different regions in the state of Paraná (Brazil) was analyzed. The heritability results were high in the uni-characteristic analysis: 0.71, 0.72 and 0.67 for the cities of Palotina (PL), Floriano (FL) and Diamond North (DN), respectively. Genetic correlations estimated in bivariate analyzes were weak with values between 0.12 for PL-FL, 0.06 for PL and 0.23 for DN-FL-DN. The Spearman correlation values were low, which indicated a change in ranking in the selection of animals in different environments in the study. There was heterogeneity in the phenotypic variance among the three regions and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Fish; Genetic gain; Heritability; Genetic correlation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602931

Parameter induction in continuous univariate distributions: Well-established G families
Provedor de dados: 42
Autores: Tahir,Muhammad H.; Nadarajah,Saralees.
The art of parameter(s) induction to the baseline distribution has received a great deal of attention in recent years. The induction of one or more additional shape parameter(s) to the baseline distribution makes the distribution more flexible especially for studying the tail properties. This parameter(s) induction also proved helpful in improving the goodness-of-fit of the proposed generalized family of distributions. There exist many generalized (or generated) G families of continuous univariate distributions since 1985. In this paper, the well-established and widely-accepted G families of distributions like the exponentiated family, Marshall-Olkin extended family, beta-generated family, McDonald-generalized family, Kumaraswamy-generalized family and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta-distribution; Exponentiated family; Kumaraswamy distribution; Marshall-Olkin family; McDonald distribution; Reliability properties.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200539

An overview of inventories of gall-inducing insects in Brazil: looking for patterns and identifying knowledge gaps
Provedor de dados: 42
Autores: ARAÚJO,WALTER S. DE; FERNANDES,GERALDO W.; SANTOS,JEAN C.
We compiled published Brazilian gall-inducing insect inventories aiming to understand trends and biases in this field research and to investigate the factors that potentially explain the diversity of gall-inducing insects among different sampling sites. A total of 51 studies with gall-inducing insect inventories were compiled for Brazil, which sampled 151 sites in 88 municipalities, 13 states and five regions. The number of papers published on gall-inducing insects per year has increased over the last 30 years, being Cecidomyiidae (Diptera) the main galling taxon, Fabaceae the main host-plant family and Protium heptaphyllum (Burseraceae) the most important super-host species in these inventories. We found a great bias in the geographical distribution of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Cecidomyiidae; Cerrado; Fabaceae; Gall-inducing insects.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100617

U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil
Provedor de dados: 42
Autores: FISCHEL,DANIELLE P.; PIMENTEL,MÁRCIO M.; FUCK,REINHARDT A.; ARMSTRONG,RICHARD.
U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanic sample yielded 2115 ± 23 Ma and from the granite yielded 2089 ± 14 Ma, interpreted as crystallization ages of these rocks. Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicating a crystallization age of 2262 ± 110 Ma and positive epsilonNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubatuba Granite have Paleoproterozoic T DM model ages between 2.30 and 2.42 Ga and epsilonNd(T) values vary between -0.22 and -0.58. The oldest T DM value refers to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: U-Pb SHRIMP; Sm-Nd isotopic data; Brasília Belt; Basement rocks.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300012

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations
Provedor de dados: 42
Autores: LIRA,CAMILA C.S; MEDEIROS,PEDRO H.A.; NETO,IRAN E. LIMA.
Abstract  Eutrophication of lakes has affected society in many regions, particularly in water scarce environments where: i) low runoff reduces the self-purification potential of water bodies; ii) water supply relies on surface reservoirs, which are susceptible to nutrient enrichment. This work presents an assessment of the impact of the silted sediment management on the trophic status of a tropical surface reservoir with intense temporal variability of water storage. A complete mixing model describing the total phosphorus budget in the water and sediments was used, based on semi-empirical formulations. The sediment reuse as soil fertilizer has been proposed to increase productivity in small scale agriculture, which should also enhance the water quality by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water-sediment interaction; Sediment reuse; Eutrophication; Water quality modelling; Tropical reservoir.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100601

A giant on the ground: another large-bodied Atractus (Serpentes: Dipsadinae) from Ecuadorian Andes, with comments on the dietary specializations of the goo-eaters snakes
Provedor de dados: 42
Autores: PASSOS,PAULO; SCANFERLA,AGUSTÍN; MELO-SAMPAIO,PAULO R.; BRITO,JORGE; ALMENDARIZ,ANA.
ABSTRACT Body-size is significantly correlated with the number of vertebrae (pleomerism) in multiple vertebrate lineages, indicating that somitogenesis process is an important factor dictating evolutionary change associated to phyletic allometry and, consequently, species fitness and diversification. However, the role of the evolution of extreme body sizes (dwarfism and gigantism) remains elusive in snakes, mainly with respect to postnatal ontogeny in dietary preferences associated with evolution of gigantism in many lineages. We described herein a new species in the highly diversified and species-rich genus Atractus on the basis of four specimens from the southeastern slopes of the Ecuadorian Andes. The new species is morphologically similar and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atractus gigas; Atractus touzeti; Dietary shift; Goo-eater snakes; Macrostomy; Postnatal ontogeny.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200702

Leaf area estimation of cassava from linear dimensions
Provedor de dados: 42
Autores: ZANETTI,SAMARA; PEREIRA,LAÍS F.M.; SARTORI,MARIA MÁRCIA P.; SILVA,MARCELO A.
ABSTRACT The objective of this study was to determine predictor models of leaf area of ​​cassava from linear leaf measurements. The experiment was carried out in greenhouse in the municipality of Botucatu, São Paulo state, Brazil. The stem cuttings with 5-7 nodes of the cultivar IAC 576-70 were planted in boxes filled with about 320 liters of soil, keeping soil moisture at field capacity, monitored by puncturing tensiometers. At 80 days after planting, 140 leaves were randomly collected from the top, middle third and base of cassava plants. We evaluated the length and width of the central lobe of leaves, number of lobes and leaf area. The measurements of leaf areas were correlated with the length and width of the central lobe and the number of lobes of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Leaf biometrics; Statistical models; Multiple regression.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401729

Environmental risk for aquatic and terrestrial organisms associated with drift from pesticides used in soybean crops
Provedor de dados: 42
Autores: BUENO,MARIANA R.; CUNHA,JOÃO PAULO A.R. DA.
Abstract  Several countries included the assessment of environmental drift contamination risk for the registration of pesticides. This practice is not yet totality effective in Brazil; however, due to the large number of pesticides in use, it is important to identify the real contamination risk during pesticide spraying. Therefore, this study determined the indices of environmental risks for exposure to drift from terrestrial applications of fungicides, herbicides, and insecticides that are used in soybean crops under Brazilian climate conditions and established buffer zones for the application of these products. Based on the three prediction drift models for soybeans in Brazil, risk indices were computed for aquatic organisms and terrestrial organisms...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drift curves; Glycine max; Pesticide application technology; Risk assessment.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201007

Supramolecular photochemistry and solar cells
Provedor de dados: 42
Autores: IHA,NEYDE YUKIE MURAKAMI.
Supramolecular photochemistry as well as solar cells are fascinating topics of current interest in Inorganic Photochemistry and very active research fields which have attracted wide attention in last two decades. A brief outline of the investigations in these fields carried out in our Laboratory of Inorganic Photochemistry and Energy Conversion is given here with no attempt of an exhaustive coverage of the literature. The emphasis is placed on recent work and information on the above mentioned subjects. Three types of supramolecular systems have been the focus of this work: (i) cage-type coordination compounds; (ii) second-sphere coordination compounds, exemplified by ion-pair photochemistry of cobalt complexes and (iii) covalently-linked systems. In the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inorganic photochemistry; Supramolecular photochemistry; Solar cells; Photoelectrochemical devices.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100009

Volume equations for Khaya ivorensis A. Chev. plantations in Brazil
Provedor de dados: 42
Autores: OLIVEIRA,XIMENA M. DE; RIBEIRO,ANDRESSA; FERRAZ FILHO,ANTONIO CARLOS; MAYRINCK,RAFAELLA C.; LIMA,RENATO R. DE; SCOLFORO,JOSÉ ROBERTO S.
Abstract African mahogany (Khaya spp.) plantations are in expansion in Brazil and in the world. This fact justifies the need for studies related to its growth and yield. This paper aimed to evaluate the performance of single-entry and double-entry models for estimating merchantable and total volume for Khaya ivorensis plantations before the first thinning (7 years) and expected final cut (15 years). Volume data was from 100 and 46 trees in Minas Gerais and Pará states, respectively, by using an electronic dendrometer (Criterion RD 1000). Observed volumes were calculated by Smalian’s formula. To validate the optical dendrometer, 10 trees were felled and had their volume measured, and compared with the volumes measured indirectly. The results showed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: African mahogany; Forest mensuration; Non-destructive measurements; Thinning.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703285

Cyanobacteria, microcystins and cylindrospermopsin in public drinking supply reservoirs of Brazil
Provedor de dados: 42
Autores: BITTENCOURT-OLIVEIRA,MARIA DO CARMO; PICCIN-SANTOS,VIVIANE; MOURA,ARIADNE N.; ARAGÃO-TAVARES,NÍSIA K.C.; CORDEIRO-ARAÚJO,MICHELINE K.
Brazil has a history of blooms and contamination of freshwater systems by cyanobacterial toxins. The monitoring relevance of toxins from cyanobacteria in reservoirs for public supply is notorious given its high toxicity to mammals, included humans beings. The most recurrent toxins in Brazilian water bodies are microcystins (MC). However, the recent record of cylindrospermopsin (CYN) in northeastern Brazil, Pernambuco state, alerts us to the possibility that this could be escalating. This study reports occurrence of MC and CYN, quantified with ELISA, in 10 reservoirs, devoted to public drinking supply in northeastern Brazil. The composition and quantification of the cyanobacteria community associated with these water bodies is also presented. From 23...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bloom; Harmful algae; Monitoring; Toxin; Water quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100297

The 15N isotope to evaluate fertilizer nitrogen absorption efficiency by the coffee plant
Provedor de dados: 42
Autores: Fenilli,Tatiele A.B.; Reichart,Klaus; Bacchi,Osny O.S.; Trivelin,Paulo C.O.; Dourado-Neto,Durval.
The use of the 15N label for agronomic research involving nitrogen (N) cycling and the fate of fertilizer-N is well established, however, in the case of long term experimentation with perennial crops like citrus, coffee and rubber tree, there are still shortcomings mainly due to large plant size, sampling procedures, detection levels and interferences on the system. This report tries to contribute methodologically to the design and development of 15N labeled fertilizer experiments, using as an example a coffee crop fertilized with 15N labeled ammonium sulfate, which was followed for two years. The N of the plant derived from the fertilizer was studied in the different parts of the coffee plant in order to evaluate its distribution within the plant and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental design; Replicate variability; Stable isotope methodology; Perennial crop.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400015

Floristics and Reproductive Phenology of Trees and Bushes in Central West Brazil
Provedor de dados: 42
Autores: ASSUNÇÃO,VIVIAN A.; CASAGRANDE,JOSÉ C.; SARTORI,ÂNGELA L.B.
Environmental conditions such as temperature, soil, photoperiodic factors and precipitation can determine the physical environment favoring the occurrence of given species and interfere with the reproductive period of plants. This work involved monthly excursions to a slope in the Serra de Maracaju between December 2009 and November 2010. Samples were collected in eight 25 x 50 m plots, transverse to the slope, totaling 1 ha sampled. Floristic richness included 79 species distributed into 58 genera and 31 families. Floristic Similarity Analysis and Principal Component Analysis showed the occurrence of two plant formations on the slope: seasonal deciduous forest andcerradão on the eutrophic soil of the slope. Flowering and fruiting occured in the rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerradão; Community; Eciduous forest; Eutrophic soil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200785

Production, characterization and toxicology assay of creatine pegylated nanoliposome with polysorbate 80 for brain delivery
Provedor de dados: 42
Autores: BORIN,DIEGO B.; MEZZOMO,NATHANA J.; VAUCHER,RODRIGO A.; CARMO,GUILHERME DO; RODRIGUES JUNIOR,LUIZ C.; SULCZEWSKI,FERNANDO B.; SCHWERTZ,CLAITON I.; MENDES,RICARDO E.; DAMIANI,ADRIANI P.; ANDRADE,VANESSA M. DE; RECH,VIRGÍNIA C.; BOECK,CARINA R.
ABSTRACT Creatine acts intracellularly as energy buffer and storage, demonstrating protective effects in animal models of neurodegenerative diseases. However, its permeability throught blood-brain barrier (BBB) is reduced. The aim of the present study was developing a carrier to facilitate the delivery of creatine to the central nervous system. Creatine nanoliposomes were produced, characterized and assayed in models of toxicity in vitro and in vivo. Particles showed negative zeta potential (-12,5 mV), polydispersity index 0.237 and medium-size of 105 nm, which was confirmed by transmission electron microscopy (TEM) images. Toxicity assay in vitro was evaluated with blank liposomes (no drug) or creatine nanoliposomes at concentrations of 0.02 and 0.2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nanocarrier; Neurodegenerative diseases; Nanotechnology; Liposomes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502317

Colored shade nets induced changes in growth, anatomy and essential oil of Pogostemon cablin
Provedor de dados: 42
Autores: RIBEIRO,AURISLAINE S.; RIBEIRO,MARIANA S.; BERTOLUCCI,SUZAN K.V.; BITTENCOURT,WANDERLEY J.M.; CARVALHO,ALEXANDRE A. DE; TOSTES,WESLEY N.; ALVES,EDUARDO; PINTO,JOSÉ E.B.P.
ABSTRACT The purpose of this investigation was to determine the influence of colored shade nets on the growth, anatomy and essential oil content, yield and chemical composition of Pogostemon cablin. The plants were cultivated under full sunlight, black, blue and red nets. The harvesting was performed 5 months after planting and it was followed by the analysis of plant growth parameters, leaf anatomy, essential oil content, yield and chemical composition. The plants grown under red net have produced more leaf, shoot, total dry weight and leaf area. Plants cultivated under colored nets showed differences in morphological features. Plants maintained under red net had a higher leaf blade thickness and polar and equatorial diameter of the stomata ratio....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light quality; Patchouli; Patchoulol; Radiation intensity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401823

Trichomes and chemical composition of the volatile oil of Trichogonia cinerea (Gardner) R. M. King &amp;amp; H. Rob. (Eupatorieae, Asteraceae)
Provedor de dados: 42
Autores: FERNANDES,YANNE S.; TRINDADE,LUMA M.P.; REZENDE,MARIA HELENA; PAULA,JOSÉ R.; GONÇALVES,LETÍCIA A.
Trichogonia cinerea is endemic to Brazil and occurs in areas of cerrado and campo rupestre. In this study, we characterized the glandular and non-glandular trichomes on the aerial parts of this species, determined the principal events in the development of the former, and identified the main constituents of the volatile oil produced in its aerial organs. Fully expanded leaves, internodes, florets, involucral bracts, and stem apices were used for the characterization of trichomes. Leaves, internodes, florets, and involucral bracts were examined by light microscopy and scanning electron microscopy, whereas stem apices were examined only by light microscopy. Branches in the reproductive phase were used for the extraction and determination of the composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Volatile oil; Histochemistry; Ontogeny; Secretory structure.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100309

Attraction between two similar particles in an electrolyte: effects of Stern layer absorption
Provedor de dados: 42
Autores: Plouraboué,Franck; Chang,Hua-Chia.
When Debye length is comparable or larger than the distance between two identical particles, the overlapping among the particles double-layers can play an important role in their interactions. This paper presents a theoretical analysis of the interaction among two identical particles with overlapped double-layers. We particularly focus on the effect of a Stern electro static condition from linearization of the adsorption isotherm near the isoelectric (neutrality) point in order to capture how polyvalent ion condensation affect sand reverses the surface charge. The stationary potential problem is solved within the framework of an asymptotic lubrication approach for a mean-field Poisson-Boltzmann model. Both spherical and cylindrical particles are analyzed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Like-charge attraction; Stern layers; Poisson-Boltzmann problem; Interacting double-layers.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100009

Diversity and associations between coastal habitats and anurans in southernmost Brazil
Provedor de dados: 42
Autores: OLIVEIRA,MAURO C.L.M.; SANTOS,MAURICIO B. DOS; LOEBMANN,DANIEL; HARTMAN,ALEXANDRE; TOZETTI,ALEXANDRO M.
This study aimed to verify the relationship between habitat and the composition of anuran species in dune and restinga habitats in southernmost Brazil. The habitats were sampled between April 2009 and March 2010 using pitfalls with drift fence. We have captured 13,508 individuals of 12 anuran species. Species richness was lower in the dunes and dominance was higher in the resting. Apparently the less complex plant cover, water availability, and wide daily thermal variation in dunes act as an environmental filter for frogs. This hypothesis is reinforced by the fact that the most abundant species (Physalaemus biligonigerus and Odonthoprynus maisuma) bury themselves in the sand, minimizing these environmental stresses. Despite being in the Pampa biome, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Coastal dunes; Restinga; Niche.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200575

Occurrence of gastrointestinal parasites in wild animals in State of Paraná, Brazil
Provedor de dados: 42
Autores: SPRENGER,LEW K.; YOSHITANI,URSULA Y.; BUZATTI,ANDREIA; MOLENTO,MARCELO B.
ABSTRACT The objective of this study was to determine the prevalence and diversity of gastrointestinal parasites in fecal samples from wild birds and mammals from the State of Paraná. In total, 220 stool samples were sent to Parasitic Diseases Laboratory of the Federal University of Paraná during 13 months (Jan/2013-Jan/2014). A total of 52.7% (116/220) of the animals were positive for cysts, oocysts, eggs and/or trophozoites. In birds, the positivity rate was 37.9% (25/66) and mammals was 59.1% (91/154). Strongyloidea superfamily eggs were observed in 37.3% (82/220) of the samples, Eimeria spp. in 10% (22/220), and Trichuris spp. in 4.5% (10/220). The most frequent mammal species were llamas (Lama glama), and dromedaries (Camelus bactrianus) with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cross-sectional study; Environmental management; Wild animals; Zoonosis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100231

The Pirambóia-Botucatu succession (Late Permian - Early Cretaceous, Paraná Basin, São Paulo and Paraná States): two contrasting eolian systems
Provedor de dados: 42
Autores: DONATTI,LEANDRO M.; SAWAKUCHI,ANDRÉ O.; GIANNINI,PAULO C. F.; FERNANDES,LUIZ A.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300020

Honey physicochemical properties of three species of the brazilian Melipona
Provedor de dados: 42
Autores: Lage,Lorena G.A.; Coelho,Lívia L.; Resende,Helder C.; Tavares,Mara G.; Campos,Lucio A.O.; Fernandes-Salomão,Tânia M.
Physicochemical analyses were carried out to evaluate 27 samples of honeys from three species of the Brazilian genus Melipona (M. capixaba, M. rufiventris and M. mondury) from Espírito Santo and Minas Gerais States. The parameters water activity (Aw), percentage of soluble solids (Brix %), pH, acidity (meq/Kg) and moisture (%) were evaluated. The honey characteristics obtained from these samples were very similar to the ones from other Melipona species. However, regarding the honey from Apis (honey bee), only the pH values were similar. The low pH value and the high acidity detected in Melipona honey are potential factors for increasing the honey shelf life because they do not provide favorable conditions for the microbial development. On the other hand,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Honey; Melipona; Meliponini; Physicochemical data.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300003

An examination of soil and water conservation practices in the paddy fields of Guilan province, Iran
Provedor de dados: 42
Autores: ASHOORI,DARYOUSH; BAGHERI,ASGHAR; ALLAHYARI,MOHAMMAD S.; AL-RIMAWI,AHMAD S.
ABSTRACT This study examined the use of soil and water conservation (SWC) practices among rice farmers in Iran. A random sample of 400 rice paddy farmers in the Foumanat plain of Guilan province, who use SWC measures, was drawn from a population of 52 thousand farmers. A two-part questionnaire was used to examine the level of utilization of SWC practices and to profile paddy farmers. Internal consistency was demonstrated with a coefficient alpha of 0.76, and the content and face validity of the instrument was confirmed by a panel of soil and water experts. Descriptive and analytical statistics were used to analyze the data. Results of ANOVA indicated that the mean levels of SWC practices vary considerably at the 0.01 level of significance by groups of age,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation practices; Soil and water; Rice paddy; Foumanat plain; Iran.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300959

The status of the name Alysium holtingii C. Agardh, a red alga described from Brazil, and a depiction of the type specimen
Provedor de dados: 42
Autores: Wynne,Michael J.
The type specimen of the red alga Alysium holtingii C. Agardh, described from Brazil, is located in the Lund Herbarium, and it is depicted for the first time in a publication. It is taxonomically identical to Dichotomaria obtusata (J. Ellis and Solander) Lamarck and thus can be treated as a later taxonomic synonym. Alysium is regarded as congeneric with Dichotomaria.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alysium; Brazil; Dichotomaria obtusata; Red algae; Taxonomy; Type specimen.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200010

Parasitism of the isopod Riggia puyensis Rodríguez-Haro et al. in two armored catfish from Pastaza Province (Ecuador)
Provedor de dados: 42
Autores: PLAUL,SILVIA E.; RODRÍGUEZ-HARO,CECILIA; MARTORELLI,SERGIO R.; BARBEITO,CLAUDIO G.
Abstract: Riggia puyensis, an ectoparasitic isopod, was collected in juvenile Chaetostoma breve and Chaetostoma microps host specimens from the Amazonian region of Ecuador. The aim of this work is to study the possible injury that the parasite causes in its host. R. puyensis was found covered by a fold of the skin, which formed a sort of pocket or pouch within the host’s peritoneal cavity. The alterations described in the epidermis were associated with the mechanical action of the isopod inside the pouch.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Armored catfish; Cymothoidae; Isopod; Riggia puyensis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700611

Ultrastructural features of Mimulus aurantiacus (Scrophulariaceae) pollen tubes in vivo
Provedor de dados: 42
Autores: Ekici,Nuran; Dane,Feruzan; Olgun,Göksel.
The aim of this study is to give information on ultrastructure of in vivo pollen tubes of Mimulus aurantiacus which were collected from the Botanical Garden of the University of California at Berkeley. Materials were prepared according to electron microscopy methods and examined under Zeiss electron microscope. Four zones were examined in the pollen tubes of Mimulus aurantiacus. APICAL ZONE: Mitochondria, smooth endoplasmic reticulum, rough endoplasmic reticulum, dictyosomes and secretory vesicles were observed. SUBAPICAL ZONE: This area contained abundant rough endoplasmic reticulum and occasionally some smooth endoplasmic reticulum. The polysomes, mitochondria, proplastids that contain starch, small vacuoles and a few lipid bodies were detected. NUCLEAR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vivo; Mimulus; Pollen tube; Ultrastructure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100005

Activity and Stability of Dispersed Multi Metallic Pt-based Catalysts for CO Tolerance in Proton Exchange Membrane Fuel Cell Anodes
Provedor de dados: 42
Autores: HASSAN,AYAZ; TICIANELLI,EDSON A.
ABSTRACT Studies aiming at improving the activity and stability of dispersed W and Mo containing Pt catalysts for the CO tolerance in proton exchange membrane fuel cell (PEMFC) anodes are revised for the following catalyst systems: (1) a carbon supported PtMo electrocatalyst submitted to heat treatments; (2) Pt and PtMo nanoparticles deposited on carbon-supported molybdenum carbides (Mo2C/C); (3) ternary and quaternary materials formed by PtMoFe/C, PtMoRu/C and PtMoRuFe/C and; (4) Pt nanoparticles supported on tungsten carbide/carbon catalysts and its parallel evaluation with carbon supported PtW catalyst. The heat-treated (600 oC) Pt-Mo/C catalyst showed higher hydrogen oxidation activity in the absence and in the presence of CO and better stability,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat treatment; CO tolerance; Stability; Carbides; Quaternary catalysts.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200697

Effectiveness of Arbuscular Mycorrhizal Fungal Isolates from the Land Uses of Amazon Region in Symbiosis with Cowpea
Provedor de dados: 42
Autores: SILVA,GLÁUCIA ALVES E; SIQUEIRA,JOSÉ O.; STÜRMER,SIDNEY L.; MOREIRA,FATIMA M.S.
ABSTRACT Arbuscular mycorrhizal fungi provide several ecosystem services, including increase in plant growth and nutrition. The occurrence, richness, and structure of arbuscular mycorrhizal fungi communities are influenced by human activities, which may affect the functional benefits of these components of the soil biota. In this study, 13 arbuscular mycorrhizal fungi isolates originating from soils with different land uses in the Alto Solimões-Amazon region were evaluated regarding their effect on growth, nutrition, and cowpea yield in controlled conditions using two soils. Comparisons with reference isolates and a mixture of isolates were also performed. Fungal isolates exhibited a wide variability associated with colonization, sporulation, production of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Inceptisol; Oxisol; Root colonization; Vigna unguiculata.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100357

Biological functions of selenium and its potential influence on Parkinson's disease
Provedor de dados: 42
Autores: ELLWANGER,JOEL H.; FRANKE,SILVIA I.R.; BORDIN,DIANA L.; PRÁ,DANIEL; HENRIQUES,JOÃO A.P.
ABSTRACT Parkinson's disease is characterized by the death of dopaminergic neurons, mainly in the substantia nigra, and causes serious locomotor dysfunctions. It is likely that the oxidative damage to cellular biomolecules is among the leading causes of neurodegeneration that occurs in the disease. Selenium is an essential mineral for proper functioning of the brain, and mainly due to its antioxidant activity, it is possible to exert a special role in the prevention and in the nutritional management of Parkinson's disease. Currently, few researchers have investigated the effects of selenium on Parkinson´s disease. However, it is known that very high or very low body levels of selenium can (possibly) contribute to the pathogenesis of Parkinson's disease,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neurodegeneration; Nutrition; Oxidative stress; Parkinson's disease; Selenium.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501655

Chemical composition and acaricidal activity of the essential oils from Vitex agnus-castus L. (Verbenaceae) and selected monoterpenes
Provedor de dados: 42
Autores: Neves,Roberta C.S.; Camara,Claudio A.G. da.
ABSTRACT Tetranychus urticae is considered one of the main plagues in the world. Its occurrence in Pernambuco was registered for the first time in 1985 and it has caused considerable damage to the farmers, attacking different cultures of agricultural interest. The essential oils from different parts of Vitex agnus-castus harvested in the Atlantic forest in the state of Pernambuco, Brazil, were obtained by hydrodistillation and the acaricidal potential was evaluated against Tetranychus urticae using two methods under laboratory conditions. Gas chromatography-mass spectrometry revealed the presence of 47 components accounting for 98.8 ± 0.0%, 93.0 ± 0.1% and 97.4 ± 1.0% of the essential oils from the leaves, fruit and inflorescence, respectively. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acarcidal activity Tetranychus urticae 1; 8-cineole essential oil Vitex agnus-castus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401221

Spatial variability of soil potassium in sugarcane areas subjected to the application of vinasse
Provedor de dados: 42
Autores: CARVALHO,LAÉRCIO A. DE; MEURER,ISMAEL; JUNIOR,CARLOS A. DA SILVA; SANTOS,CRISTIANE F.B.; LIBARDI,PAULO L.
When deposited on land the vinasse can promote improvement in fertility, however, often fertilizer application occurs in areas considered homogeneous, without taking into account the variability of the soil. The objective of this study was to evaluate the effect of vinasse application on potassium content in two classes of soils cultivated with sugarcane, and characterize the spatial variability of soil using geostatistical techniques. In the 2010 and 2011 crop year, soil samples were collected from an experimental grid at 0-0.2 and 0.2-0.4 m depth in three soils cultivated with sugarcane, totaling 90 samplings in each grid, for the determination of pH, calcium (Ca), magnesium (Mg), potassium (K), phosphorus (P), aluminum (Al) and potential acidity (H +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Saccharum officinarum; Semivariogram; Soil fertility.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401999

Soil-vegetation relationships on a banded ironstone 'island', Carajás Plateau, Brazilian Eastern Amazonia
Provedor de dados: 42
Autores: Nunes,Jaquelina A.; Schaefer,Carlos E.G.R.; Ferreira Júnior,Walnir G.; Neri,Andreza V.; Correa,Guilherme R.; Enright,Neal J.
Vegetation and soil properties of an iron-rich canga (laterite) island on the largest outcrop of banded-iron formation in Serra de Carajás (eastern Amazonia, Brazil) were studied along a topographic gradient (738-762 m asl), and analyzed to test the hypothesis that soil chemical and physical attributes play a key role in the structure and floristic composition of these plant communities. Soil and vegetation were sampled in eight replicate plots within each of the four vegetation types. Surface (0-10 cm) soil samples from each plot were analyzed for basic cations, N, P and plant species density for all species was recorded. CCA ordination analysis showed a strong separation between forest and non-forest sites on the first axis, and between herbaceous and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Forest; Canga; Carajás; Ferruginous campo rupestre; Iron formation; Laterite.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502097

Evaluation of a rat model of exercise-induced fatigue using treadmill running with progressively increasing load
Provedor de dados: 42
Autores: HOU,LIJUAN; LI,KE; HU,YANRU; BIAN,YIJUN; JI,WEI; SHI,KAIXUAN; LI,YITING; CHEN,MENGJIAO; LI,JIAXIN; LIU,XIAOLI; QIAO,DECAI.
Abstract: The mechanism behind exercise-induced fatigue is a significant topic in the field of sports physiology. Therefore, establishing and evaluating an acute exercise-induced fatigue animal model that explores the limits of the motor system may provide greater insight into these mechanisms. Heart rate is an important quantitative parameter that accurately reflects the immediate change in physical function due to exercise load. And there is likely to be an important correlation between heart rate and behavioral performance. In this study, changes in heart rate and behavioral indexes during exercise-induced fatigue were quantitatively analyzed in rats using heart rate telemetry and video methods respectively. The behavioral indexes were used as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise-induced fatigue; Animal model; Treadmill running; Heart rate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700624

Injuries caused by the venomous catfish pintado and cachara (Pseudoplatystoma genus) in fishermen of the Pantanal region in Brazil
Provedor de dados: 42
Autores: AQUINO,GIULIANO N.R. DE; SOUZA,CELSO C. DE; HADDAD JUNIOR,VIDAL; SABINO,JOSÉ.
ABSTRACT  INTRODUCTION:  the fishing activity throughout the Upper Paraguay River Basin has huge financial and biological importance. This retrospective study investigated the occurrence of injuries caused by fish of the Pseudoplatystoma genus (spotted catfish or pintado and striped catfish or cachara) in professional fishermen of the Pantanal of Mato Grosso do Sul State.  METHODS:  we collected information through a questionnaire, showing that fishing is carried out by workers with low level of education, mainly adults or seniors with low financial gains.  RESULTS: in Miranda town, 126 of 315 fishermen were interviewed and 38 individuals reported injuries (30.16%). In Corumbá town, 355 of 627 fishermen were interviewed, and 111 (56,61%) reported injuries....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal; Spotted catfish; Striped catfish; Pseudoplatystoma; Professional fishermen; Public Health.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401531

Effects of cigarette smoke condensate on the production and characterization of exopolysaccharides by Bifidobacterium
Provedor de dados: 42
Autores: Hu,Jinqiang; Wei,Tao; Sun,Siwen; Zhao,Aijing; Xu,Chunping.
The aim of the study was to investigate the effect of cigarette smoke on the production and characterization of exopolysaccharides (EPSs) produced by Bifidobacterium. Cigarettes of Shanhua brand (nicotine: 1.1 mg, tar: 11 mg) were utilized to prepare a cigarette smoke condensate (CSC). The standard strain of Bifidobacterium animalis was cultured in MRS media under anaerobic addition of CSC. The results showed that CSC significantly decreased the growth of B. animalis as well as EPSs and acetic acid production. Furthermore, two EPSs fractions (Fr-I and Fr-II) were isolated and purified for chemical and molecular determination. By comparison with control, CSC was found to be of great impact on EPSs carbohydrate composition. The molecular weight mass of Fr-I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exopolysaccharides; Cigarette smoke condensate; Bifidobacterium; Acetic acid.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200997

Biostratigraphy and paleoecology of an unusual palynological record from the Aquidauana Formation, Late Pennsylvanian of Paraná Basin
Provedor de dados: 42
Autores: Souza,Paulo A.; Perinotto,José A.J.; Félix,Cristina M.; Araújo,Bruno C.
The Aquidauana Formation is a Permo-Carboniferous sedimentary unit, widely stratigraphicaly distributed in the northwestern and northern portions of the Paraná Basin. However, little paleontological data is available from this formation, preventing accurate biostratigraphic and paleoecological interpretations. An abundant, diversified and well preserved assemblage of palynomorphs was recognized from sampling conducted in an outcrop section in Cipolândia District of Aquidauana Municipality, state of Mato Grosso do Sul, Brazil. A total of 35 indigenous palynomorph taxa was recognized, comprising 6 species of spores (related to 5 genera), 28 species of pollen grains (14 genera) and 1 species of chlorophycean algae. Monosaccate pollen grains are exceptionally...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biostratigraphy; Paleoecology; Palynology; Pennsylvanian.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200611

In vitro antiparasitic activity and chemical composition of the essential oil from Protium ovatum leaves (Burceraceae)
Provedor de dados: 42
Autores: ESTEVAM,ELISÂNGELA B.B.; DEUS,ISABELLA P.B. DE; SILVA,VANESSA P. DA; SILVA,ELIZABETH A.J. DA; ALVES,CASSIA C.F.; ALVES,JOSÉ MILTON; CAZAL,CRISTIANE M.; MAGALHÃES,LIZANDRA G.; PAGOTTI,MARIANA C.; ESPERANDIM,VIVIANE R.; SOUZA,ALEX F.; MIRANDA,MAYKER L.D.
ABSTRACT Leishmaniasis and trypanosomiasis are globally widespread parasitic diseases which have been responsible for high mortality rates. Since drugs available for their treatment are highly hepatotoxic, nephrotoxic and cardiotoxic, adherence to therapy has been affected. Thus, the search for new, more effective and safer drugs for the treatment of these diseases is necessary. Natural products have stood out as an alternative to searching for new bioactive molecules with therapeutic potential. In this study, the chemical composition and antiparasitic activity of the essential oil from Protium ovatum leaves against trypomastigote forms of Trypanosoma cruzi and the promastigote forms of Leishmania amazonensis were evaluated. The essential oil was promising...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Leishmania amazonensis; Essential oil; Protium ovatum; Parasitic diseases.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603005

Bromophenol concentrations in fish from Salvador, BA, Brazil
Provedor de dados: 42
Autores: Oliveira,Aline S.; Silva,Vilma M.; Veloso,Márcia C.C.; Santos,Gislaine V.; Andrade,Jailson B. de.
The main objective of this work is to evaluate the occurrence of bromophenols (2bromophenol, 4bromophenol, 2,4dibromophenol, 2,6dibromophenol and 2,4,6tribromophenol), in the flesh and guts in two species of the LutjanidaeFamily: Lutjanus synagris and Ocyurus chrysurus. The bromophenols were extracted by steam distillation with pentaneether (7:3 v/v), identified by reverse phase High Performance Liquid Chromatography (HPLCUV), and quantified bythe externalstandard method. Total bromophenol concentrations were similar in the muscle of both species, rangingfrom 36 ng g¹ to 349 ng g¹. The total bromophenol concentrations in stomach (ranging from 12 ng g¹ to 586 ng g¹)were slightly higher than in muscle. The presence of bromophenol in the muscles of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromophenols; Flavor; Marine fishes; Lutjanus; Ocyurus.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200002

Influence of natural settlement cues on the metamorphosis of fiddler crab megalopae, Uca vocator (Decapoda: Ocypodidae)
Provedor de dados: 42
Autores: Simith,Darlan J.B.; Diele,Karen; Abrunhosa,Fernando A.
Megalopae of many decapod crab species accelerate their development time to metamorphosis (TTM) when exposed to natural physical and/or chemical cues characteristic of the parental habitat. In the present study, the influence of natural settlement cues on the moulting rates and development TTM in megalopae of the fiddler crab Uca vocator was investigated. The effects of mud from different habitats (including well-preserved and degraded-polluted mangrove habitats) and conspecific adult 'odours' (seawater conditioned with crabs) on the induction of metamorphosis were compared with filtered pure seawater (control). 95 to 100% of the megalopae successfully metamorphosed to first juvenile crab stage in all treatments, including the control. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conspecific 'odours'; Fiddler crab; Megalopa; Metamorphosis; Settlement; Uca vocator.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200007

Periodic perturbations of quadratic planar polynomial vector fields
Provedor de dados: 42
Autores: MESSIAS,MARCELO.
In this work are studied periodic perturbations, depending on two parameters, of quadratic planar polynomial vector fields having an infinite heteroclinic cycle, which is an unbounded solution joining two saddle points at infinity. The global study envolving infinity is performed via the Poincaré compactification. The main result obtained states that for certain types of periodic perturbations, the perturbed system has quadratic heteroclinic tangencies and transverse intersections between the local stable and unstable manifolds of the hyperbolic periodic orbits at infinity. It implies, via the Birkhoff-Smale Theorem, in a complex dynamical behavior of the solutions of the perturbed system, in a finite part of the phase plane.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heteroclinic cycles; Periodic perturbations; Polynomial systems.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200001

Richards growth model and viability indicators for populations subject to interventions
Provedor de dados: 42
Autores: Loibel,Selene; Andrade,Marinho G.; Val,João B.R. do; Freitas,Alfredo R. de.
In this work we study the problem of modeling identification of a population employing a discrete dynamic model based on the Richards growth model. The population is subjected to interventions due to consumption, such as hunting or farming animals. The model identification allows us to estimate the probability or the average time for a population number to reach a certain level. The parameter inference for these models are obtained with the use of the likelihood profile technique as developed in this paper. The identification method here developed can be applied to evaluate the productivity of animal husbandry or to evaluate the risk of extinction of autochthon populations. It is applied to data of the Brazilian beef cattle herd population, and the the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Richards growth model; Population risk; Harvested populations; Parametric estimate; Likelihood profile function.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400028

Seasonal pelage color change: news based on a South American Rodent
Provedor de dados: 42
Autores: Camargo,Carolina R.; Colares,Elton; Castrucci,Ana Maria L.
Mammalian seasonalmolting and color change are known to be influencedby photoperiod changes. Calomys laucha, a South American rodent, exhibits seasonal pelage color change; however, unlike Northern hemisphere rodents, which present a gray or brown color during summer and a whitish color during winter, C. laucha pelage changes from an orange color during summer to a dark gray color during winter. Animals maintained for over a year in stationary photoperiod (LD 12:12h, 22ºC) presented orange pelage color during the summer corresponding month (January), and gray color during the winter corresponding month (July). Same age animals were evaluated during summer or winter months, and also showed different colors. Animals exposed for 12 weeks to summer or winter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Color change; Endogenous rhythm; Seasonality; Molt; Pelage color.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100009

Pluton emplacement in a releasing bend in a transpressive regime: the arrozal granite in the Paraíba do Sul shear belt, Rio de Janeiro
Provedor de dados: 42
Autores: Nummer,Alexis R.; Machado,Rômulo; Dehler,Nolan M.
The Arrozal Granite, situated in the southwestern region of the State of Rio de Janeiro, has a granitic to granodioritic composition. It contains a strong mylonitic foliation along its border, passing gradually to a well-developed magmatic foliation towards its center. Structural analysis indicates that the Arrozal Granite was emplaced along the Além-Paraíba Shear Zone in a dextral transpressive tectonic regime. A regional shift of the trend along this shear zone from NE-SW to E-W, observed in the area, is interpreted to be casually related to the creation of space for the emplacement of the granite. Our data indicate that releasing bends may have played an important role for space generation during the emplacement of the Arrozal Granite and other plutons.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Releasing-bend; Transpression; Arrozal Granite; Emplacement.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200011

A second note on the geographical differentiation of Amphisbaena fuliginosa L., 1758 (Squamata, Amphisbaenidae), with a consideration of the forest refuge model of speciation
Provedor de dados: 42
Autores: VANZOLINI,PAULO EMILIO.
The geographical differentiation of Amphisbaena fuliginosa L. is studied with basis on 220 specimens from 99 definite and 2 generic localities, ranging from Panamá to Puno in Peru and Goiás in Brasil. The pattern found is considered to support Vanzolini's 1951 scheme of five subspecies, defined by color pattern and by four meristic characters, and differentiated in consequence of Quaternary paleoecological events. Recent developments relating to models of differentiation in Quaternary tropical South America are briefly considered.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subspecies; Paleoclimates; Amphisbaena; Refuge model.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400006

Spatial resolution influence on the identification of land cover classes in the Amazon environment
Provedor de dados: 42
Autores: PONZONI,FLÁVIO J.; GALVÃO,LÊNIO S.; EPIPHANIO,JOSÉ C.N.
To evaluate the role played by the spatial resolution in distinguishing land cover classes in the Amazon region, different levels of spatial resolution (60, 100, 120, 200 and 250 meters) were simulated from a Landsat_5 Thematic Mapper (TM) image. Thematic maps were produced by visual interpretation from the original (30 x 30 meters) and simulated set of images. The map legend included primary forest, old and young woody secondary succession, and non-forest. The results indicated that for the discrimination between primary forest and non-forest, spatial resolution did not have great influence for pixel size equal or lower than 200 meters. The contrary was verified for the identification of old and young woody secondary vegetation due to their occurrence in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial resolution; Remote sensing; Amazon region; Thematic maps; Tropical rain forest.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400011

First Assessment of Carbon Stock in the Belowground Biomass of Brazilian Mangroves
Provedor de dados: 42
Autores: SANTOS,DANIEL M.C.; ESTRADA,GUSTAVO C.D.; FERNANDEZ,VIVIANE; ESTEVAM,MARCIEL R.M.; SOUZA,BRUNNA T. DE; SOARES,MÁRIO L.G.
ABSTRACT Studies on belowground roots biomass have increasingly reported the importance of the contribution of this compartment in carbon stock maintenance in mangrove forests. To date, there are no estimates of this contribution in Brazilian mangrove forests, although the country has the second largest area of mangroves worldwide. For this study, trenches dug in fringing forests in Guaratiba State Biological Reserve (Rio de Janeiro, Brazil) were used to evaluate the contribution of the different classes of roots and the vertical stratification of carbon stock. The total carbon stock average in belowground roots biomass in these forests was 104.41 ± 20.73 tC.ha−1. From that, an average of 84.13 ± 21.34 tC.ha−1 corresponded to the carbon stock only in fine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Global climate change; Guaratiba State Biological Reserve; Roots; Sepetiba bay; Trench method.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401579

Alterations in the mitotic index of Allium cepa induced by infusions of Pluchea sagittalis submitted to three different cultivation systems
Provedor de dados: 42
Autores: Rossato,Liana V.; Tedesco,Solange B.; Laughinghouse IV,Haywood D.; Farias,Júlia G.; Nicoloso,Fernando T.
We evaluated the antiproliferative effect of infusions from Pluchea sagittalis using the Allium cepa test. Infusions in three concentrations (2.5, 5, and 25 g dm-3) of leaves cultivated in three environments (in vitro, acclimatized growth chamber, and field) were used. Six onion bulbs were used for each of the eight treatments, and the mitotic index was obtained from 6000 cells per treatment. In conclusion, leaf infusions of P. sagittalis cultivated in the field have a high antiproliferative activity, as well as the cultivation system influences the antiproliferative potential.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiproliferative effect; Camphorweed; Cell cycle; Medicinal plant; Mutagenicity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400007

Distributional patterns of herbivore megamammals during the Late Pleistocene of South America
Provedor de dados: 42
Autores: GALLO,VALERIA; AVILLA,LEONARDO S.; PEREIRA,RODRIGO C.L.; ABSOLON,BRUNO A.
The geographic distribution of 27 species of the South American megafauna of herbivore mammals during the Late Pleistocene was analyzed in order to identify their distributional patterns. The distribution of the species was studied using the panbiogeographical method of track analysis. Six generalized tracks (GTs) and two biogeographic nodes were obtained. The GTs did not completely superpose with the areas of open savanna present in Pleistocene, nor with the biotic tracks of some arthropods typical of arid climate, indicating that these animals avoided arid environment. Overall, the GTs coincided with some biogeographic provinces defined on the basis of living taxa, indicating that certain current distributional patterns already existed in Pleistocene....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distributional patterns; Historical Biogeography; Panbiogeography; Megafauna; Late Pleistocene; South America.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200533

Iron restriction increases myoglobin gene and protein expression in Soleus muscle of rats
Provedor de dados: 42
Autores: SOUZA,JANAINA S. DE; BRUNETTO,ERIKA L.; NUNES,MARIA TEREZA.
ABSTRACT Iron is an important trace element for proper cell functioning. It is present in cytochromes, hemoglobin and myoglobin (Mb), where it binds to oxygen. It is also an electron acceptor in the respiratory chain. Mb is an 18 kDa heme-protein, highly expressed in skeletal muscle and heart. The expression of several genes involved in the metabolism of iron is post-transcriptionally regulated by this element. Iron was shown to interfere with the polyadenylation step, modifying their poly (A) tail length and, as a consequence, their stability and translation rate. The aim of this study was to investigate whether iron supplementation or long and short-term restriction affects Mb gene and protein expression, as well as Mb mRNA poly(A) tail length, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiac muscle; Iron; Myoglobin; Skeletal muscle.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602277

Relationships of rice yield and quality based on genotype by trait (GT) biplot
Provedor de dados: 42
Autores: SHARIFI,PEYMAN; EBADI,ALI AKBAR.
ABSTRACT An experiment was conducted to examine the influencing characters on rice by using 64 rice genotypes, including four local landraces, four released cultivars and 56 mutant lines (M5) derived from these genotypes, with application of the genotype by trait (GT) biplot methodology. The first two principal components (PC1 and PC2) accounted for 46.6% of total variation in 64 genotypes. The polygon view of GT biplot suggested seven sections for 64 genotypes. The vertex G38 had good amounts of grain yield, panicle length, hundred grain weight, internodes length, plant height and fertility percentage. Generally based on vector view it was demonstrated that the selection of high grain yield would be performed via thousand grain weight, panicle weight and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain yield; Polygon view; Trait associations; Rice; Vector view.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100343

Biogeochemistry of REE elements and tetrad effect in the soil-plant system: a study on volcanic rock covers in southernmost Brazil
Provedor de dados: 42
Autores: Cunha,Maria do Carmo Lima e; Nardi,Lauro V.S.; Muller,Ingke F.
This paper deals with the distribution of REE in rock, soil and plant in an area of monzonitic rocks from southernmost Brazil. The REE patterns in Schinus lensticifolius show a negative-Ce anomaly and a prominent tetrad effect, characterized as W-type that are not present in rock and soil samples. The REE patterns in the soils and rocks sampled are very similar and there is no fractionation of REE during the processes of soil formation. The W-type patterns are interpreted as indicating that REE were absorved by S. lentiscifolius as simple ions rather than as complex ions, or, alternatively, that the transport of REE in the plant metabolic processes was as free ions. The recognition of tetrads, either, M- or W-type patterns, is an additional tool for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: REE; Tetrad effect; Schinus lentiscifolius; Southernmost Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400006

Gastroprotective effect of Byrsonima sericea DC leaf extract against ethanol-induced gastric injury and its possible mechanisms of action
Provedor de dados: 42
Autores: Rodrigues,Patrícia A.; Morais,Selene M.; Souza,Carolina M.; Magalhães,Davi V.; Vieira,Ícaro G.P.; Andrade,Geanne M.; Rao,Vietla S.; Santos,Flávia A.
Byrsonima sericea leaves are extensively used in folk medicine in Brazil against gastric disorders. This study investigated the chemical constituents of B. sericea leaf ethanolic extract (BSLE) and its potential gastroprotective activity, with its possible mechanism of the action using ethanol to induce gastric mucosal damage in mice. The phytochemical analysis was carried out to identify the active constituents present in the extract, and the HPLC analysis was performed for the identification of flavonoids. BSLE at oral doses of 125, 250 and 500 mg/kg markedly attenuated the ethanol-evoked gastric lesions by 53.2, 84.9 and 87.6 %, respectively. The BSLE (250 mg/kg) prevented the depletion of gastric mucus and gastric mucosal nonproteic-sulfhydryl groups,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Byrsonima sericea; Flavonoids; Gastroprotection; Mechanisms of action.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100011

Antinociceptive and anti-inflammatory effects of a Geissospermum vellosii stem bark fraction
Provedor de dados: 42
Autores: LIMA,JOSÉLIA A.; COSTA,THIAGO W.R.; SILVA,LEANDRO L.; MIRANDA,ANA LUÍSA P.; PINTO,ANGELO C.
ABSTRACT Geissospermum vellosii (Pao pereira) is a Brazilian tree whose stem barks are rich in indole alkaloids that present intense anticholinesterase activity. The present study evaluated the effects of a stem bark fraction (PPAC fraction) and ethanolic extract (EE) of Pao pereira in classic murine models of inflammation and pain. The EE and PPAC fraction, both at a dose of 30 mg/kg, significantly reduced mice abdominal constriction induced by acetic acid by 34.8% and 47.5%, respectively. In the formalin test, EE (30 mg/kg) and PPAC fraction (30 and 60 mg/kg) inhibited only the second phase, by 82.8%, 84.9% and 100%, respectively. Compared with indomethacin, similar doses of EE or PPAC fraction were approximately twice as effective in causing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geissospermum vellosii; Pao pereira; Antinociception; Inflammation; Cholinergic anti-inflammatory pathway.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100237

Influence of land use changes on water chemistry in streams in the State of São Paulo, southeast Brazil
Provedor de dados: 42
Autores: Silva,Daniela M.L.; Camargo,Plínio B.; Mcdowell,William H.; Vieira,Ivan; Salomão,Marcos S.M.B.; Martinelli,Luiz A.
Streamwater is affected by several processes in the watershed including anthropogenic activities that result in changes in water quality as well as in the functioning of these stream ecosystems. Therefore, this work aims to evaluate the concentration of major ions (Ca2+, Mg2+, Na+, K+, NH4+, NO3-, NO2-, Cl-, SO4(2-), PO4(3-), HCO3-) in streams in the state of São Paulo (southeast Brazil). The sampling sites are located at undisturbed (ombrophilus dense forest, semideciduous forest and savanna - cerrado) and disturbed areas (pasture, urbanization and sugar cane crops). Streamwater chemistry varied according to land use change and, in general, was higher in disturbed sites. Streams located in undisturbed sites at Ribeira de Iguape/Alto Paranapanema watershed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochemistry; Land use; Streams; Watersheds.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400007

Susceptible hosts: a resort for parasites right in the eye of the immune response
Provedor de dados: 42
Autores: DOSREIS,GEORGE A.
Trypanosomatid protozoan parasites express an aggressive strategy of parasitism by infecting host macrophages and inducing extensive T-lymphocyte activation. One goal of such strategy is to drive the immune response of genetically susceptible hosts to a state of unresponsiveness regarding parasite killing. Unresponsiveness is achieved through different mechanisms, depending on the parasite species. In this brief review, recent findings on the molecular and cellular bases of the parasites' exploitation of host immune responses are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Leishmania chagasi; T lymphocytes; CTLA-4; Apoptosis; Transforming growth factor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100011

Diameter distribution in a Brazilian tropical dry forest domain: predictions for the stand and species
Provedor de dados: 42
Autores: LIMA,ROBSON B. DE; BUFALINO,LINA; ALVES JUNIOR,FRANCISCO T.; SILVA,JOSÉ A.A. DA; FERREIRA,RINALDO L.C.
ABSTRACT Currently, there is a lack of studies on the correct utilization of continuous distributions for dry tropical forests. Therefore, this work aims to investigate the diameter structure of a brazilian tropical dry forest and to select suitable continuous distributions by means of statistic tools for the stand and the main species. Two subsets were randomly selected from 40 plots. Diameter at base height was obtained. The following functions were tested: log-normal; gamma; Weibull 2P and Burr. The best fits were selected by Akaike's information validation criterion. Overall, the diameter distribution of the dry tropical forest was better described by negative exponential curves and positive skewness. The forest studied showed diameter distributions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga domain; Continuous distribution; Diameter structure; Forest management; Maximum likelihood.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301189

Osteohistology of the silesaurid Sacisaurus agudoensis from southern Brazil (Late Triassic) and implications for growth in early dinosaurs
Provedor de dados: 42
Autores: VEIGA,FÁBIO H.; BOTHA-BRINK,JENNIFER; RIBEIRO,ANA MARIA; FERIGOLO,JORGE; SOARES,MARINA B.
Abstract: The non-dinosaurian dinosauriform silesaurids are the closest relatives of crown-group dinosaurs and are thus, important for understanding the origins of that group. Here, we describe the limb bone histology of the Late Triassic silesaurid Sacisaurus agudoensis from the Candelária Sequence of the Santa Maria Supersequence, Rio Grande do Sul state, Brazil. The sampled bones comprise eight femora and one fibula from different individuals. The microscopic analysis of all elements reveals uninterrupted fibrolamellar bone tissue indicating rapid growth. A transition to slower growing peripheral parallel-fibered bone tissue in some individuals indicates a decrease in growth rate, suggesting ontogenetic variation within the sample. The osteohistology of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archosauria; Bone microstructure; Dinosauriform; Fibrolamellar bone; Growth rates.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400512

Assessment of Duguetia furfuracea genotoxic and cytotoxic activity in bacteria and mice
Provedor de dados: 42
Autores: Silva,Carolina R.; Vieira,Pabline M.; Santos,Suzana C.; Chen-Chen,Lee.
Duguetia furfuracea (St. Hil.) Benth &amp;amp; Hook f. (1862), popularly known as "sofre-do-rim-quem-quer" and "araticum-seco", is a shrub of the Annonaceae family that occurs in several regions of Brazil. In folk medicine the infusion of its leaves and twigs is used to treat rheumatism and renal colic, whereas the seed powder is mixed with water to treat pediculosis. Previous studies have described biological activities of this plant with cytotoxic, antitumoral, trypanocidal, leishmanicidal, antiplasmodial and antiprotozoal effects. In the present work, genotoxicity and cytotoxicity of Duguetia furfuracea lyophilized leaf extract were evaluated using the prophage λ induction test (SOS-Inductest) and mouse bone marrow micronucleus test. Our results showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Duguetia furfuracea; Genotoxicity; Micronucleus test; SOS-Inductest.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100015

Riparian forest potential to retain sediment and carbon evaluated by the 137Cs fallout and carbon isotopic ratio techniques
Provedor de dados: 42
Autores: Pires,Luiz F.; Bacchi,Osny O.S.; Correchel,Vladia; Reichardt,Klaus; Filippe,Joseline.
Riparian forests can provide an important service for aquatic ecosystems by sequestering hillslopederived sediments. However, the width of a riparian buffer zone required to filter sediments is not yet wellunderstood. Here are used two complementary tracers to measure sediment retention. The 137Cs technique and the soil carbon isotopic ratios (δ13C) are utilized to investigate sediment deposition and erosion rates on a slope transect cultivated with sugarcane followed by a secondary riparian forest zone in Iracemápolis, State of São Paulo, Brazil. The 137Cs technique and the δ13C analysis showed that the width of a riparian vegetation in accordance to a Brazilian Environmental Law (Nº4.771/65) was not sufficient in trapping sediments coming from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion; Δ13C; Sugarcane; C3 and C4 plants; Carbon.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200013

Evolution and development: some insights from evolutionary theory
Provedor de dados: 42
Autores: DAVID,JEAN R.
Developmental biology and evolutionary biology are both mature integrative disciplines which started in the 19th century and then followed parallel and independent scientific pathways. Recently, a genetical component has stepped into both disciplines (developmental genetics and evolutionary genetics) pointing out the need for future convergent maturation. Indeed, the Evo-Devo approach is becoming popular among developmental biologists, based on the facts that distant groups share a common ancestry, that precise phylogenies can be worked out and that homologous genes often play similar roles during the development of very different organisms. In this essay, I try to show that the real future of Evo-Devo thinking is still broader. The evolutionary theory is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quantitative genetics; Multicellularity; Analogy; Homology; Sexual reproduction.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300008

Zn, Co, Cr, As, and genotoxic effects in the ichthyofauna species from polluted and non-polluted/protected estuaries of the São Paulo coast, Brazil
Provedor de dados: 42
Autores: BRAGA,ELISABETE S.; AZEVEDO,JULIANA S.; KUNIYOSHI,LEONARDO; FÁVARO,DÉBORAH I.T.
Abstract: The human impact on estuarine regions results in an increasing concentration of trace elements in the environment, exposing aquatic organisms. In this study, Zn, Co, Cr, and As were determined in the muscle tissue of some fish species from Santos-São Vicente (SSV), a recognized polluted region, and in the Cananeia estuary (CAN). Genotoxicity was also determined for the evaluation of the chronic effect on ichthyofauna, to enlarge the bank of environmental data regarding the effects of pollution, and to suggest other fish bioindicator species that may contribute to monitoring programs. The obtained data showed a similar profile of an accumulation of Co and Zn in Micropogonias furnieri and Chaetodipterus faber, where: Santos Bay &gt; CAN &gt; inner...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace elements; Nuclear abnormalities in erythrocytes; Protected areas; South atlantic; Subtropical estuaries.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700501

Two new species of Phalangopsis Serville, 1831 (Orthoptera: Grylloidea: Phalangopsidae) from Brazilian Amazon Forest
Provedor de dados: 42
Autores: Mews,Carina M.; Sperber,Carlos F.
We describe here two new species of the genus Phalangopsis Serville, 1831 from the Brazilian Amazon Forest. The male genitalia and the female copulatory papilla were described, and a combination of diagnostic characteristics was given to separate both new species from the other described species. The principal morphological characteristics of this genus were discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical region; Brazil; Crickets; Phalangopsini.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400006

Sensory acceptance and qualitative analysis of fruits in papaya hybrids
Provedor de dados: 42
Autores: LUZ,LUCAS N. DA; VETTORAZZI,JULIO C.F.; SANTA-CATARINA,RENATO; BARROS,FABIO R.; BARROS,GISLANNE B.A.; PEREIRA,MESSIAS G.; CARDOSO,DEISY L.
Abstract Over the last three years, Brazil has been ranked among the three largest producers of papaya. This study aimed to evaluate the acceptance and commercial standard of papaya fruits according to their sensory traits and provide information about the organoleptic and qualitative aspects of the fruit. Ten papaya genotypes grown in Linhares-ES were investigated, arranged in a randomized block design with four replications. Ten fruits from each genotype were randomly collected from each replication, which totaled 40 fruits per genotype. The fruit harvest was performed at stage 1 of maturation. The following genotypes were assessed: hybrids UC13, UC14, UC15 and UC16, from the ‘Solo’ group; hybrids UC03, UC10 and UC12, from the ‘Formosa’ group; and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L; Solo group; Formosa group; Heterotic group.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703693

OSL age determinations of Pleistocene fluvial deposits in Central Amazonia
Provedor de dados: 42
Autores: Soares,Emílio A.A.; Tatumi,Sonia H.; Riccomini,Claudio.
Absolute dating methods have been used in chronological studies of geological processes and sedimentary units of Quaternary age in Central Amazonia, Brazil. Although radiocarbon dating has been very useful in archaeological research and soil studies, the temporal interval of this method is inefficient in evaluating the sedimentation aspects and geological events from the beginning of the Quaternary in the Amazon basin. The use of crystal luminescence dating has been one of the most promising tool for determining the absolute dating of Quaternary deposits in the Amazonian region. Optically stimulated luminescence (OSL) dating, following the MAR and SAR protocols, in a tectonic-sedimentary study of Quaternary fluvial deposits in the confluence area of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crystal luminescence dating; Quaternary; Fluvial terraces; Central Amazonia.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300017

The pathogenesis of Chagas' disease: when autoimmune and parasite-specific immune responses meet
Provedor de dados: 42
Autores: SOARES,MILENA B. P.; PONTES-DE-CARVALHO,LAIN; RIBEIRO-DOS-SANTOS,RICARDO.
Chagas' disease is a major health problem in Latin America, where it constitutes one of the leading causes of heart failure. About one fourth of Trypanosoma cruzi-infected individuals develop chronic chagasic cardiomyopathy (CChC), the most severe form of the disease. CChC is histologically characterized by the presence of multifocal inflammatory infiltrates in the heart, composed mainly by mononuclear cells, usually adhered to myocytes and leading to myocytolysis, and frequently by interstitial fibrosis. The pathogenesis of CChC is still unclear, despite intense investigations both in human beings and in animal models of the disease. Although tissue parasitism is rare in the chronic phase of infection, an immune response targeted to persistent parasites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chagas' disease; Myocarditis; Autoimmunity; Trypanosoma cruzi; Delayed-type hypersensitivity.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400008

Assessment of the yield loss imparted by Orobanche aegyptiaca in tomato in Pakistan
Provedor de dados: 42
Autores: AHMAD,TANVEER; AHMAD,BILAL; TARIQ,RANA M. SABIR; SYED,M. ZIA-UL-HASSAN; AHMAD,ZAHOOR.
Abstract Broomrapes (Orobanche sp.) are root holoparasitic plants causing severe damage to various families of horticultural crops. A Preliminary survey was carried in tomato fields infested with orobanche in Potohar plateau of Pakistan. Results indicated that each planting bed comprising10-12 tomato plants contained 7-8 parasitic weeds. Overall survey indicated the 65-70% plants suffered partial or complete yield loss. Further, it was estimated that the number of weeds inhabiting plant-1 was ranged from 2-4. Yield loss was estimated at 57.17 tons/ha while in terms of financial loss, it was 2579.87 $/ha. Hence total estimated loss on the total surveyed area of 16 hectares was 41395.85 $. The high potential of tomato cultivation in Pakistan reinforces the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broomrapes; Orobanche; Pakistan; Tomato.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703559

Chymotrypsin- and trypsin-like activities secreted by the multidrug-resistant yeasts forming the Candida haemulonii complex
Provedor de dados: 42
Autores: SOUTO,XÊNIA M.; BRANQUINHA,MARTA H.; SANTOS,ANDRÉ L.S.
Abstract: Candida haemulonii complex (C. haemulonii, C. haemulonii var. vulnera and C. duobushaemulonii) consists of emergent multidrug-resistant pathogens that cause bloodstream and deep-seated infections. However, little is known about their virulence factors. Herein, we evaluated the presence of extracellular serine peptidases in this fungal complex. Serine peptidase activity was measured by spectrophotometry using chromogenic peptide substrates to the S1 family. Chymotrypsin-, trypsin- and elastase-like activities were detected in all fungal isolates. Since higher chymotrypsin- and trypsin-like activities were observed from the cleavage of N-succinyl-Ala-Ala-Pro-Phe-pNa and N-benzoyl-Phe-Val-Arg-pNa, respectively, these substrates were selected for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian clinical isolates; Candida haemulonii complex; Chymotrypsin; Serine peptidases; Trypsin; Virulence factors.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500803

Pequi leaves incorporated into the soil reduce the initial growth of cultivated, invasive and native species
Provedor de dados: 42
Autores: ALLEM,LAÍSA N.; GOMES,ANABELE S.; BORGHETTI,FABIAN.
Studies have identified the phytotoxicity of many native species of the Cerrado; however, most of them were conducted either in inert substrates, or using exaggerate proportions of plant material. We investigated the phytotoxicity of pequi leaves added to substrate soil in quantities compatible with the litter produced by this species. Pequi leaves were triturated and added to red latosol in concentrations of 0.75%, 1.5% and 3%; the control was constituted of leafless soil. These mixtures were added to pots and irrigated daily to keep them moist. Germinated seeds of the cultivated sorghum and sesame, of the invasive brachiaria and of the native purple ipê, were disposed in the pots to grow for five to seven days at 30°C within a photoperiod of 12 h....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Caryocar brasiliense; Cerrado; Phytotoxicity; Tabebuia impetiginosa; Urochloa decumbens.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401761

On a new peirosaurid crocodyliform from the Upper Cretaceous, Bauru Group, southeastern Brazil
Provedor de dados: 42
Autores: Campos,Diogenes A.; Oliveira,Gustavo R.; Figueiredo,Rodrigo G.; Riff,Douglas; Azevedo,Sergio A.K.; Carvalho,Luciana B.; Kellner,Alexander W.A.
A new crocodyliform from the Upper Cretaceous (Campanian-Maastrichtian) Presidente Prudente Formation of the Bauru Group is described based on two almost complete skulls and mandibles. The material comes from the "Tartaruguito" site, situated at an old railroad between the cities of Pirapozinho and Presidente Prudente, state of São Paulo, Brazil. The new species, Pepesuchus deiseae gen. et sp. nov., is classified in the clade Peirosauridae on the basis of three synapomorphies: the presence of five premaxillary teeth, the anterior two premaxillary alveoli nearly confluent, and the oval cross-section of the jugal along the lower temporal bar. The new taxon increases the outstanding crocodyliform diversity of the Bauru Group, particularly of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pepesuchus; Peirosauridae; Cretaceous; Bauru Group; Brazil.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100020

Treadmill exercise does not change gene expression of adrenal catecholamine biosynthetic enzymes in chronically stressed rats
Provedor de dados: 42
Autores: GAVRILOVIĆ,LJUBICA; STOJILJKOVIĆ,VESNA; KASAPOVIĆ,JELENA; POPOVIĆ,NATAŠA; PAJOVIĆ,SNEŽANA B.; DRONJAK,SLADJANA.
ABSTRACTChronic isolation of adult animals represents a form of psychological stress that produces sympatho-adrenomedullar activation. Exercise training acts as an important modulator of sympatho-adrenomedullary system. This study aimed to investigate physical exercise-related changes in gene expression of catecholamine biosynthetic enzymes (tyrosine hydroxylase, dopamine-ß-hydroxylase and phenylethanolamine N-methyltransferase) and cyclic adenosine monophosphate response element-binding (CREB) in the adrenal medulla, concentrations of catecholamines and corticosterone (CORT) in the plasma and the weight of adrenal glands of chronically psychosocially stressed adult rats exposed daily to 20 min treadmill running for 12 weeks. Also, we examined how...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adrenal medulla; Acute immobilization stress; Catecholamine; Chronic social isolation; Gene expression; Treadmill exercise.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300999

Interdisciplinary paleovegetation study in the Fernando de Noronha Island (Pernambuco State), northeastern Brazil
Provedor de dados: 42
Autores: Pessenda,Luiz C.R.; Gouveia,Susy E.M.; Ledru,Marie-Pierre; Aravena,Ramon; Ricardi-Branco,Fresia S.; Bendassolli,José A.; Ribeiro,Adauto de S.; Saia,Soraya E.M.G.; Sifeddine,Abdelfettah; Menor,Eldemar de A.; Oliveira,Sônia M.B. de; Cordeiro,Renato C.; Freitas,Ângela M. de M.; Boulet,René; Filizola,Heloisa F.
The aim of this research was to reconstruct vegetation changes (with climate inferences) that occurred during the Holocene in the Fernando de Noronha Island, Pernambuco State, northeastern Brazil. The research approach included the use of geochemical (mineralogy, elemental), carbon isotopes (δ13C, 14C) and pollen analyses in soil organic matter (SOM) and sediments collected in Lagoa da Viração and Manguezal do Sueste. The carbon isotopes data of SOM indicated that there was no significant vegetation changes during the last 7400 BP, suggesting that the climate was not the determinant factor for the vegetation dynamics. The pollen analysis of the sediment of a core collected in the Lagoa da Viração showed the absence of Quaternary material in the period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen; Carbon isotopes; Paleovegetation; Fernando de Noronha; Holocene.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400009

A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil
Provedor de dados: 42
Autores: Kellner,Alexander WA.; Azevedo,Sergio A.K.; Machado,Elaine B.; Carvalho,Luciana B. de; Henriques,Deise D.R.
A new spinosaurid taxon, Oxalaia quilombensis gen. et sp. nov., is described based on the anterior part of a snout and a fragment of a maxilla. These specimens were collected at the Laje do Coringa site, Late Cretaceous (Cenomanian) of the São Luis Basin. Unlike Cristatusaurus and Suchomimus, Oxalaia quilombensis lacks serrations on the teeth. The new species differs from Angaturama limai by having the anterior part of the premaxillae more expanded and by lacking a sagittal premaxillary crest. It further differs from Spinosaurus cf. S. aegyptiacus and the Algerian spinosaurid by the rounder shape of the terminal expansion. Furthermore, xalaia quilobensis has one functional tooth followed by two replacement teeth, a feature not previously observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinosauria; Spinosauridae; Oxalaia quilombensis; Cenomanian; Brazil.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100006

Recharge contribution to the Guarani Aquifer System estimated from the water balance method in a representative watershed
Provedor de dados: 42
Autores: Wendland,Edson; Gomes,Luis H.; Troeger,Uwe.
The contribution of recharge to regional groundwater flow systems is essential information required to establish sustainable water resources management. The objective of this work was to determine the groundwater outflow in the Ribeirão da Onça Basin using a water balance model of the saturated soil zone. The basin is located in the outcrop region of the Guarani Aquifer System (GAS). The water balance method involved the determination of direct recharge values, groundwater storage variation and base flow. The direct recharge was determined by the water table fluctuation method (WTF). The base flow was calculated by the hydrograph separation method, which was generated by a rain-flow model supported by biweekly streamflow measurements in the control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Groundwater; Monitoring; Recharge; Specific yield; WTF.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200595

Anurans in a forest remnant in the transition zone between cerrado and atlantic rain forest domains in southeastern Brazil
Provedor de dados: 42
Autores: PIRANI,RENATA M.; NASCIMENTO,LUCIANA B.; FEIO,RENATO N.
This study presents the species richness, temporal distribution and reproductive activity of anurans from the Uaimií State Forest (Floresta Estadual do Uaimií – FLOE Uaimií), situated in the Quadrilátero Ferrífero region, municipality of Ouro Preto, Minas Gerais state, Brazil. Field activities were performed monthly from September 2009 to August 2010. We recorded 36 anurans species, distributed in 10 families. The greatest richness of the sampled sites corresponds to a permanent rivulet in a secondary forest. The majority of anuran species presented seasonal vocalization activity pattern, mainly in the rainy season. The anuran species composition of FLOE Uaimií is similar to others studied areas from the Quadrilátero Ferrífero region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Espinhaço Mountain Range; Inventory; Reproductive activity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301093

The Evolution of Pneumatic Foramina in Pterosaur Vertebrae
Provedor de dados: 42
Autores: BUCHMANN,RICHARD; RODRIGUES,TAISSA.
Abstract: Pterosaurs possess skeletal pneumatization, which can be assessed externally through the observation of pneumatic foramina. These foramina vary in position, shape, and number among taxa. Here we propose new characters referring to the position and number of pneumatic foramina present in cervical and dorsal vertebrae of pterosaurs. A cladistic analysis was performed after first-hand study of material in collections and using data from the literature in order to test these new characters for homology, and they were subsequently mapped in a strict consensus tree. The analysis resulted in nine equally parsimonious trees with 215 steps each. The strict consensus tree obtained does not present significant differences in relation to trees obtained in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Phylogeny; Axial skeleton; Skeletal pneumatization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400601

Characterization of granite and limestone powders for use as fillers in bituminous mastics dosage
Provedor de dados: 42
Autores: BARRA,BRENO; MOMM,LETO; GUERRERO,YADER; BERNUCCI,LIEDI.
This paper discusses the importance of studies on materials known as fillers from different mineral origins, used in asphalt mixes, specifically in the formulation of mastics. The research was carried out on samples of limestone and granite rock filler and asphalt binder (50/70). The samples were evaluated through semiquantitative chemical analyses by X-ray fluorescence, granulometry by low angle laser emission, scanning electron microscopy, softening point tests, penetration tests, and aggregate-asphalt binder and aggregate-mastic adhesion tests. The results highlighted convergent trends, indicating that the active behavior of the fillers in the mastic formulation is not related to the size of the particles, but rather to their form, surface texture,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characterization; Fillers; Granite; Limestone; Bituminous mastics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200995

Synthesis and Cytotoxic Evaluation of 1H-1,2,3-Triazol-1-ylmethyl-2,3-dihydronaphtho[1,2-b]furan-4,5-diones
Provedor de dados: 42
Autores: CHIPOLINE,INGRID C.; ALVES,EVELYNE; BRANCO,PAOLA; COSTA-LOTUFO,LETICIA V.; FERREIRA,VITOR F.; SILVA,FERNANDO C. DA.
ABSTRACT The 1,2-naphthoquinone compound was previously considered active against solid tumors. Moreover, glycosidase inhibitors such as 1,2,3-1H triazoles has been pointed out as efficient compounds in anticancer activity studies. Thus, a series of eleven 1,2-naphthoquinones tethered in C2 to 1,2,3-1H-triazoles 9a-k were designed, synthesized and their cytotoxic activity evaluated using HCT-116 (colon adenocarcinoma), MCF-7 (breast adenocarcinoma) and RPE (human nontumor cell line from retinal epithelium). The chemical synthesis was performed from C-3 allylation of lawsone followed by iodocyclization with subsequent nucleophilic displacement with sodium azide and, finally, the 1,3-dipolar cycloaddition catalyzed by Cu(I) with terminal alkynes led to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Naphthoquinones lawsone 1; 2; 3-triazoles cancer colon adenocarcinoma breast adenocarcinoma.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301027

A new characterization of the Euclidean sphere
Provedor de dados: 42
Autores: BARROS,ABDÊNAGO A.; AQUINO,CÍCERO P.; GOMES,JOSÉ N.V.
Abstract In this paper, we obtain a new characterization of the Euclidean sphere as a compact Riemannian manifold with constant scalar curvature carrying a nontrivial conformal vector field which is also conformal Ricci vector field.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conformal vector field; Scalar curvature; Euclidean sphere; Einstein manifold.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602663

Contamination potential of the Ilhabela (SP) landfill
Provedor de dados: 42
Autores: RODRIGUES,CRISTIANE L.; TAIOLI,FABIO.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300030

Structure and temporal variation of the phytoplankton of a macrotidal beach from the Amazon coastal zone
Provedor de dados: 42
Autores: MATOS,JISLENE B.; OLIVEIRA,SUELLEN M.O. DE; PEREIRA,LUCI C.C.; COSTA,RAUQUÍRIO M. DA.
ABSTRACT The present study aimed to analyze the structure and the temporal variation of the phytoplankton of Ajuruteua beach (Bragança, Pará) and to investigate the influence of environmental variables on the dynamics of this community to provide a basis about the trophic state of this environment. Biological, hydrological and hydrodynamic samplings were performed during a nyctemeral cycle in the months of November/08, March/09, June/09 and September/09. We identified 110 taxa, which were distributed among the diatoms (87.3%), dinoflagellates (11.8%) and cyanobacteria (0.9%), with the predominance of neritic species, followed by the tychoplankton species. Chlorophyll-a concentrations were the highest during the rainy period (24.5 mg m-3), whereas total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon beaches; Biomass; Microalgae; Seasonal variation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401325

Miconia gigantea, a long-forgotten endemic and endangered species of Melastomataceae in the Brazilian Atlantic Forest
Provedor de dados: 42
Autores: ROSA,LILIAN P.G. DA; BAUMGRATZ,JOSÉ F.A.; SILVA NETO,SEBASTIÃO J. DA.
ABSTRACT Taxonomic and floristic studies in the state of Rio de Janeiro allowed the rediscovery of Miconia gigantea, an endemic species to the Atlantic Forest, until recently known only from the type specimen, collected over 100 years by A.F.M. Glaziou. We present an amended and detailed description of M. gigantea, providing characteristics of the flowers, fruits and seeds, in addition to illustrations, comments about taxonomic affinities with closely related species, the presently known distribution together with new occurrence records, and the conservation status.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Endemism; Glossocentrum; Miconieae; Rio de Janeiro.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501809

Genetic diversity assessed by microsatellite markers in the amphicarpic species Trifolium polymorphum Poir.
Provedor de dados: 42
Autores: CONTERATO,IONARA F.; SCHIFINO-WITTMANN,MARIA TERESA; GUERRA,DIVANILDE; BÜTTOW,MIRIAM V.; AGNOL,MIGUEL DALL’; DAHMER,NAIR.
ABSTRACT Trifolium polymorphum Poir. is an amphicarpic forage legume from southern Brazil, Uruguay, Argentina, Paraguay and Chile. Information on the genetic diversity of natural populations in natural grasslands in southern Brazil is limited. In order to increase the knowledge about this species, an analysis of the genetic diversity was carried out in 10 natural populations of T. polymorphum with the use of 20 microsatellite markers. The expected heterozygosity in T. polymorphum populations ranged from 0.40 to 0.43, with a mean of 0.42. A total of 193 alleles were detected with a mean of 9.3 alleles per locus and polymorphic information content (PIC) for these markers of 0.62 to 0.89 with a mean of 0.84.The grouping based on the Jaccard’s coefficient of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic variability; Microsatellites; Natural grasslands; Pampa biome.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401685

The hypersurfaces with conformal normal Gauss map in Hn+1 and S1n+1
Provedor de dados: 42
Autores: Shi,Shuguo.
In this paper, we introduce the fourth fundamental forms for hypersurfaces in Hn+1 and space-like hypersurfaces in S1n+1, and discuss the conformality of the normal Gauss map of the hypersurfaces in Hn+1 and S1n+1. Particularly, we discuss the surfaces with conformal normal Gauss map in H³ and S³1, and prove a duality property. We give a Weierstrass representation formula for space-like surfaces in S³1 with conformal normal Gauss map. We also state the similar results for time-like surfaces in S³1. Some examples of surfaces in S³1 with conformal normal Gauss map are given and a fully nonlinear equation of Monge-Ampère type for the graphs in S³1 with conformal normal Gauss map is derived.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fourth fundamental form; Conformal normal Gauss map; Generalized Gauss map; Duality property; De Sitter Gauss map; Monge-Ampère equation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100002

Sodium reduction in margarine using NaCl substitutes
Provedor de dados: 42
Autores: GONÇALVES,CARLA; RODRIGUES,JÉSSICA; JÚNIOR,HERALDO; CARNEIRO,JOÃO; FREIRE,TASSYANA; FREIRE,LUÍSA.
ABSTRACT Sodium chloride is traditionally used as a food additive in food processing. However, because of its high sodium content, NaCl has been associated with chronic diseases. Margarine is a popular product that is used in several preparations, but it includes high sodium content; therefore, it is among the products whose sodium content should be reduced. Thus, the objective of this study was to produce margarines with reduced sodium content prepared using a salt mixture. The following 4 margarine formulations were prepared: Formulation A (control - 0% sodium reduction), Formulation B (20.8% less sodium), Formulation C (33.0% less sodium) and Formulation D (47.4% less sodium). The low sodium formulations were produced using a salt mixture consisting of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acceptance; KCl; Monosodium glutamate; TDS; TI.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502505

A new class of lifetime models and the evaluation of the confidence intervals by double percentile bootstrap
Provedor de dados: 42
Autores: MARINHO,PEDRO R.D.; BOURGUIGNON,MARCELO; SILVA,RODRIGO B.; CORDEIRO,GAUSS M.
Abstract: In this paper, we introduce a new three-parameter distribution by compounding the Nadarajah-Haghighi and geometric distributions, which can be interpreted as a truncated Marshall-Olkin extended Weibull. The compounding procedure is based on the work by Marshall and Olkin 1997. We prove that the new distribution can be obtained as a compound model with mixing exponential distribution. It can have decreasing, increasing, upside-down bathtub, bathtub-shaped, constant and decreasing-increasing-decreasing failure rate functions depending on the values of the parameters. Some mathematical properties of the new distribution are studied including moments and quantile function. The maximum likelihood estimation procedure is discussed and a particle swarm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exponential distribution; Failure rate function; Geometric distribution; Maximum likelihood estimation; Nadarajah-Haghighi distribution.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100202

In vitro germination of zygotic embryos of hybrid BRS Manicoré (E. guineensis X E. oleifera)
Provedor de dados: 42
Autores: BONETTI,KEILA A.P.; QUOIRIN,MARGUERITE; QUISEN,REGINA C.; LIMA,SUELEN C.S.
ABSTRACT The interspecific oil palm hybrid BRS Manicoré (E. guineensis x E. oleifera) has superior agronomic characteristics. However, the germination rate is low (30%) and the process is slow when the seeds are sown in a conventional form. The purpose of this study was to optimize the in vitro germination of zygotic embryos of this hybrid comparing seed lots. The viability of zygotic embryos was evaluated by the tetrazolium test (0.075%) for 4 h. The embryos were cultured on MS and Y3 culture media, with and without the addition of NaH2PO4, as well as on MS, MS1/2 and N6 medium. In MS medium containing NaH2PO4, the germination rate was increased from 40 to 70% in comparison with the medium without sodium phosphate. The comparison between the culture media...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interspecific hybrid; Sodium phosphate; Tetrazolium; Y3.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501841

Diamictite facies of the Itararé subgroup (late paleozoic), in the southern Paraná basin, Brazil
Provedor de dados: 42
Autores: Canuto,José Roberto; Rocha-Campos,Antonio C.; Santos,Paulo R.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400018

Mortality of the defoliator Euselasia eucerus (Lepidoptera: Riodinidae) by biotic factors in an Eucalyptus urophylla plantation in Minas Gerais State, Brazil
Provedor de dados: 42
Autores: Zanuncio,José C.; Torres,Jorge B.; Sediyama,Camilla A.Z.; Pereira,Fabricio F.; Pastori,Patrik L.; Wermelinger,Eduardo D.; Ramalho,Francisco S.
Euselasia eucerus (Hewitson, 1872) (Lepidoptera: Riodinidae) is a Brazilian native species commonly found in Eucalyptus plantations. Biotic mortality factors of this defoliator were studied in a Eucalyptus urophylla plantation in Minas Gerais State, Brazil aiming to identify natural enemies and their impact on this insect. Euselasia eucerus had biotic mortality factors during all development stages. The most important were Trichogramma maxacalii Voegelé and Pointel, 1980 (Hymenoptera: Trichogrammatidae) during egg stage (48.9%), a tachinid fly (Diptera: Tachinidae) during larval stages (10%) and Itoplectis sp. (Hymenoptera: Ichneumonidae) during pupal stage (52.2%). The parasitism rate was higher in the basal part of the plant canopy (37.8%).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eulophidae; Fungus; Ichneumonidae; Pentatomidae; Scelionidade; Trichogramma.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100008

The role of RNA in genetic programming, the interaction between humming birds and angiosperms in two areas of the Serra da Bodoquena (Mato Grosso do Sul, Brazil), and new extinct flying reptiles from China
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400001

Production, characterization and application of inulinase from fungal endophyte CCMB 328
Provedor de dados: 42
Autores: Nascimento,Diego S.; Valasques Junior,Gildomar; Fernandes,Pedro; Ribeiro,Geise C.A.; Lima,Danyo M.; Góes-Neto,Aristóteles; Oliveira,Rodrigo Q.; Figueiredo-Ribeiro,Rita de Cassia L.; Assis,Sandra A. de.
Inulinase (β-2,1-D- fructan fructanohydrolase), EC 3.2.1.7, targets the β-2,1 linkage of inulin, a polyfructan consisting of linear β-2,1 linked fructose, and hydrolyzes it into fructose. This use provides an alternative to produce fructose syrup through the hydrolysis of inulin. The objective of this work was to study the production, characterization and applications of inulinases from the fungal endophyte CCMB 328 isolated from the Brazilian semi-arid region. Response Surface Methodology (RSM) was employed to evaluate the effect of variables (concentration of glucose and yeast extract), on secreted inulinase activities detected in the culture medium and also in the inulin hydrolysis. The results showed that the best conditions for inulinase production by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inulin; Inulinase; Yeasts; Semi-arid; Fungal endophyte.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200014

Initial development of the endocarp in Lithraea brasiliensis Marchand (Anacardiaceae): with taxonomic notes
Provedor de dados: 42
Autores: OLIVEIRA,JOÃO M.S. DE; MARIATH,JORGE E.A.
Investigation into the initial developmental stages of a given structure is fundamental for precise characterization as well as for comparative analysis in relation to other taxa when homologies are established. For the Anacardiaceae family, investigations of the initial development of the pericarp or its basic histological sites, the epicarp, mesocarp and endocarp, are relevant since these regions are of taxonomic and phylogenetic importance. The initial stages of endocarp development in Lithraea brasiliensis were studied using light microscopy. In L. brasiliensis, the fruits are of the drupe type. The endocarp originates exclusively in the epidermis of the locular cavity and is composed of only three strata. The crystalliferous layer, typical in fruits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardioideae; Crystalliferous layer; Endocarp; Lithraea.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401711

Natural radioactivity: occurrence and applications on environmental studies
Provedor de dados: 42
Autores: GODOY,JOSÉ M.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300039

Longitudinal study of the sympathovagal balance in women submitted to bariatric surgery
Provedor de dados: 42
Autores: LUCAS,CRISTINA M.S.; ZANIQUELI,DIVANEI; ALVIM,RAFAEL O.; MIGUEL,GUSTAVO P.S.; MILL,JOSÉ GERALDO.
Abstract  Studies have shown improvement of the cardiac autonomic balance in post-bariatric patients. Most of these studies included patients using drugs interfering in the autonomic nervous system. This study assessed the time course of changes in the sympathovagal balance after bariatric surgery (Roux-en-Y gastric bypass) in 26 women free from drugs. A 10-min electrocardiographic recording was obtained at baseline and at 3 and 6 months after surgery. Temporal and spectral domains of heart rate variability were analysed. The time domain components of cardiac vagal modulation increased progressively after surgery. In the frequency domain, high frequency power increased from 24.9 at baseline (18.0 to 46.3) to 44.5 at 3 months (23.4 to 65.6), and 54.1 at 6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bariatric surgery; Autonomic control; Heart rate variability; Vagus outflow.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100907

Science communication in Brazil: A historical review and considerations about the current situation
Provedor de dados: 42
Autores: MASSARANI,LUISA; MOREIRA,ILDEU DE CASTRO.
ABSTRACT In this paper, we present a historical overview of the science communication activities in Brazil since the nineteenth century and we analyze the current situation and its main concerns. The principal scopes and tools for science communication discussed here are the following: science centers and museums, mass media and large public events for communicating science and technology (S&amp;T). In recent years, such activities have had a significant breakthrough in Brazil. Yet, there is still a long way to go in order to deliver a quality and extensive science and technology communication to the Brazilians as well as to achieve a suitable level of social appropriation of knowledge on S&amp;T by the Brazilian society. Some of the main challenges that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Science communication; Brazil; History of science communication; Public communication of science and technology; Science centers and museums; Science and media.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401577

Regional movements of the tiger shark, Galeocerdo cuvier, off northeastern Brazil: inferences regarding shark attack hazard
Provedor de dados: 42
Autores: HAZIN,FÁBIO H.V.; AFONSO,ANDRÉ S.; CASTILHO,PEDRO C. DE; FERREIRA,LUCIANA C.; ROCHA,BRUNO C.L.M.
An abnormally high shark attack rate verified off Recife could be related to migratory behavior of tiger sharks. This situation started after the construction of the Suape port to the south of Recife. A previous study suggested that attacking sharks could be following northward currents and that they were being attracted shoreward by approaching vessels. In this scenario, such northward movement pattern could imply a higher probability of sharks accessing the littoral area of Recife after leaving Suape. Pop-up satellite archival tags were deployed on five tiger sharks caught off Recife to assess their movement patterns off northeastern Brazil. All tags transmitted from northward latitudes after 7-74 days of freedom. The shorter, soak distance between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Migration; Recife; Satellite telemetry; Shark attack; Suape.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301053

About periodic and quasi-periodic orbits of a new type for twist maps of the torus
Provedor de dados: 42
Autores: ADDAS-ZANATA,SALVADOR.
We prove that for a large and important class of C¹ twist maps of the torus periodic and quasi-periodic orbits of a new type exist, provided that there are no rotational invariant circles (R.I.C's). These orbits have a non-zero "vertical rotation number'' (V.R.N.), in contrast to what happens to Birkhoff periodic orbits and Aubry-Mather sets. The V.R.N. is rational for a periodic orbit and irrational for a quasi-periodic. We also prove that the existence of an orbit with a V.R.N = a &gt; 0, implies the existence of orbits with V.R.N = b, for all 0 &lt; b &lt; a. And as a consequence of the previous results we get that a twist map of the torus with no R.I.C's has positive topological entropy, which is a very classical result. In the end of the paper we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Twist maps; Rotational invariant circles; Topological methods; Vertical rotation number; Nielsen-Thurston theory.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100003

Postharvest conservation of the tuberous roots of Pachyrhizus Ahipa (Wedd) Parodi
Provedor de dados: 42
Autores: MUSSURY,ROSILDA M.; SCALON,SILVANA P.Q.; SILVA,MAGAIVER A.; SILVA,TATIANE F.; GOMES,HELLEN; GASSI,ROSIMEIRE.
This paper aimed to evaluate the effects of storage periods on the conservation of Pachyrhizus ahipa roots at different temperatures and packaging materials. The roots were harvested, washed, packed in PVC, plastic bags, without wrappings (control) and stored in polystyrene trays in refrigerators, or cold chambers, or at room temperature. Total titratable acidity (TTA), total soluble solids (TSS), pH, as well as their ash, lipid, total carbohydrate and protein (dry basis) contents were analyzed. The lowest loss of root fresh weight was observed in the cold chamber and plastic bags. The TTA remained higher among roots stored in the cold chamber and in PVC packaging. The lowest TSS contents were observed for roots stored in the cold chamber, and these did...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yam bean; Storage conditions; Packaging; Preservation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200761

Effect of phosphorus on arsenic uptake and metabolism in rice cultivars differing in phosphorus use efficiency and response
Provedor de dados: 42
Autores: FARIAS,JÚLIA G.; BERNARDY,KATIELI; SCHWALBERT,RAÍSSA; DEL FRARI,BIANCA K.; MEHARG,ANDREW; CAREY,MANUS; MARQUES,ANDERSON C.R.; SIGNES-PASTOR,ANTONIO; SAUSEN,DARLENE; SCHORR,MÁRCIO R.W.; TAVARES,MIRIAN S.; NICOLOSO,FERNANDO T.
ABSTRACT A hydroponic experiment was carried out to investigate the effect of phosphorus (P) nutrition on arsenic (As) uptake and translocation within the seedlings of rice cultivars. The experiment occurred in three stages: I 5 days of acclimatization (nutritive solution); II 10 days under P (0.0 and 0.09 mM) and As (0.0 and 100 mM) treatments; III 5 days under recovery. The As exposure had significant effect reducing dry weights of shoots or roots, resulted in elevated concentrations of As in shoot tissues. BR-IRGA 409 showed the highest susceptibility to As in biomass production and root system parameters regardless the P level. This cultivar showed contrasting responses of As translocation to shoot tissue dependent on P levels, with the highest As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral nutrition; Oryza sativa; Phosphate; Arsenic uptake.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100163

A model for coupled electro-hydro-mechanical processes in fine grained soils accounting for gas generation and transport
Provedor de dados: 42
Autores: Tamagnini,Claudio; Jommi,Cristina; Cattaneo,Fabio.
A theoretical and numerical model is developed for the quantitative analysis of coupled processes taking place in active waste containment systems, such as electrokinetic barriers or fences, in which alow intensity DC current is circulated across the clay barrier to move polar and non-polar contaminants. A novel feature of the proposed approach is the allowance for the presence of air in the pore space. Under unsaturated conditions, all transport coefficients involved in the electrokinetic process are strongly dependent on the degree of saturation of pore liquid. In order to assess the predictive capability of the proposed theory and to appreciate the impact of gas production at the electrodes, a series of numerical simulations of simple onedimensional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electro-osmosis; Experimental investigation; Theoretical model; Finite element analysis; Unsaturated soils.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100014

A comparison for a multiscale study of structural lineaments in southern Brazil: LANDSAT-7 ETM+ and shaded relief images from SRTM3-DEM
Provedor de dados: 42
Autores: Jacques,Patricia D.; Machado,Romulo; Nummer,Alexis R.
This paper presents a comparison of descriptive statistics obtained for brittle structural lineaments extracted manually from LANDSAT images and shaded relief images from SRTM 3 DEM at 1:100, 000 and 1:500, 000 scales. The selected area is located in the southern of Brazil and comprises Precambrian rocks and stratigraphic units of the Paraná Basin. The application of this methodology shows that the visual interpretation depends on the kind of remote sensing image. The resulting descriptive statistics obtained for lineaments extracted from the images do not follow the same pattern according to the scale adopted. The main direction obtained for Proterozoic rocks using both image types at a 1:500, 000 scale are close to NS±10, whereas at a 1:100, 000 scale...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landsat images; Remote sensing; SRTM; Santa Catarina; Statistics; Structural lineaments.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400008

Looking for attitudes related to amphibian species decline: how are peer-reviewed publications of education activities compared to ecological research?
Provedor de dados: 42
Autores: MORMUL,ROGER P.; MORMUL,TAYLA D.S.; SANTOS,GUSTAVO M.B.; SANTANA,ANA R.A.
ABSTRACT Biodiversity decline has been the focus of discussions in the last decade, especially on the amphibian species decline. After a scientometric analysis using international databases, we found that the number of peer-reviewed articles considering education practices related to the theme increased along with the number of ecological researches. However, the increase in ecological researches is much higher than the increase in publications of education practices. Studies suggest that conservation attitudes are important and that education practices are an important tool for improving human perceptions on this subject. In this sense, increase the publication of projects and programs results related to local education practices in international journals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental education; Conservation practices; Teaching activities; Amphibian extinctions; Theory and practice.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200491

Landslides Zonation Hazard: relation between geological structures and landslides occurrence in hilly tropical regions of Brazil
Provedor de dados: 42
Autores: CERRI,RODRIGO I.; REIS,FÁBIO A.G.V.; GRAMANI,MARCELO F.; GIORDANO,LUCILIA C.; ZAINE,JOSÉ EDUARDO.
ABSTRACT This paper presents a new approach of landslides zonation hazard studies, based on an integrated study of structural data along with geomorphological and external factors, in a hilly regions of Brazil, covered by a tropical humid rain-forest, called Serra do Mar. The Serra do Mar consists of a hilly region along the east coast of Brazil, with high slopes and many geological structures in a gneiss - migmatitic terrain. In contrast to traditional approaches, this method proposes that structural data (foliation, fractures and bedding planes) and its relation with the slope geometry, is important to be consider in the landslide zonation hazard, along with declivity, relative relief, soil and rock properties, land use and vegetation cover and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caraguatatuba; Geological Structures; Landslides; Serra do Mar; Hazard Zonation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602609

The surface charge of trypanosomatids
Provedor de dados: 42
Autores: SOUTO-PADRÓN,THAÏS.
The surface charge of trypanosomatids was evaluated by means of the binding of cationic particles, as visualized by electron microscopy and by direct measurements of the electrophoretic mobility of cells. The results obtained indicate that most of the trypanosomatids exhibit a negatively charged surface whose value is species specific and varies according to the developmental stages. Sialic acids associated with glycoproteins, glycolipids and phosphate groups are the major components responsible for the net negative surface charge of the trypanosomatids.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosomatids; Cell surface charge; Electrophoretic mobility; Cytochemistry.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400007

Plant- and microbial-based mechanisms to improve the agronomic effectiveness of phosphate rock: a review
Provedor de dados: 42
Autores: Arcand,Melissa M.; Schneider,Kim D.
Deficiency in plant-available phosphorus is considered to be a major limiting factor to food production in many agricultural soils. Mineral resources are necessary to restore soil phosphorus content. In regions where conventional fertilizers are not used due to cost limitations or to mitigate adverse environmental effects, local sources of phosphate rock are being increasingly recognized for potential use as alternative phosphorus fertilizers. The main obstacle associated with using directly applied ground phosphate rock is that the phosphate released is often unable to supply sufficient plant-available phosphorus for crop uptake. Plantand microbial-based mechanisms are low-cost, appropriate technologies to enhance the solubilization and increase the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Microorganisms; Phosphate rock; Phosphorus; Rhizosphere; Solubilization.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400013

Does advertisement call variation coincide with genetic variation in the genetically diverse frog taxon currently known as Leptodactylus fuscus (Amphibia: Leptodactylidae)?
Provedor de dados: 42
Autores: HEYER,W. RONALD; REID,YANA R.
The frog Leptodactylus fuscus is found throughout much of South America in open and disturbed habitats. Previous study of genetic differentiation in L. fuscus demonstrated that there was lack of genetic exchange among population units consistent with multiple species, rather than a single species. We examine advertisement vocalizations of L. fuscus to determine whether call variation coincides with genetic differentiation. Calls were analyzed for 32 individual frogs from 25 localities throughout the distributional range of L. fuscus. Although there is variation in calls among geographic samples, call variation is not concordant with genetic variation or geographic distance and the call variation observed is less than that typically found among other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Advertisement calls; Leptodactylus fuscus; Speciation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100006

Monitoring studies should consider temporal variability to reveal relations between cyanobacterial abundance and environmental variables
Provedor de dados: 42
Autores: WOJCIECHOWSKI,JULIANA; PADIAL,ANDRÉ A.
One of the main goals of monitoring cyanobacteria blooms in aquatic environments is to reveal the relationship between cyanobacterial abundance and environmental variables. Studies typically correlate data that were simultaneously sampled. However, samplings occur sparsely over time and may not reveal the short-term responses of cyanobacterial abundance to environmental changes. In this study, we tested the hypothesis that stronger cyanobacteria x environment relationships in monitoring are found when the temporal variability of sampling points is incorporated in the statistical analyses. To this end, we investigated relationships between cyanobacteria and seven environmental variables that were sampled twice yearly for three years across 11 reservoirs,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Harmful algae; Reservoir; Management; Limnological variables; Temporal variation; Neotropics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401717

Copper Stress on Photosynthesis of Black Mangle (Avicennia germinans)
Provedor de dados: 42
Autores: GONZALEZ-MENDOZA,DANIEL; GIL,FRANCISCO ESPADAS y; ESCOBOZA-GARCIA,FERNANDO; SANTAMARIA,JORGE M.; ZAPATA-PEREZ,OMAR.
The effects of copper toxicity on the photosynthetic activities of Avicennia germinans was investigated using two CuSO4 concentrations (0.062 and 0.33 M) added in Hoagland's solution in an aerated hydroponic system. Photosynthesis and chlorophyll fluorescence were measured after 30 h of copper stress. Results obtained in this study show that increasing levels of Cu+2 of 0.062 and 0.33 M Cu+2 resulted in a general reduction of the stomatal conductance (28 and 18%, respectively) and 100% of inhibition of net photosynthesis. Additionally, at these concentrations of Cu+2, reductions of chlorophyll fluorescence parameters were also observed. These changes suggested that the photosynthetic apparatus of Avicennia germinans was the primary target of the Cu+2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avicennia germinans; Chlorophyll fluorescence; Copper; Photosystem II; Photosynthesis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200665

Energy balance and CO2 emission in mechanized biomass harvesting in pine stands under thinning
Provedor de dados: 42
Autores: RODRIGUES,CARLA K.; LOPES,EDUARDO S.; SILVA,DIMAS A.; FIGUEIREDO FILHO,AFONSO; PELISSARI,ALLAN L.
Abstract:  Biomass is an important component of the Brazilian energy matrix, with a potential contribution of co-products from thinned forests. The aim of this work was to evaluate the energy balance and CO2 potential emission in mechanized biomass harvesting operations in Pinus taeda stands at 9 and 10 years-old and under thinning, searching to support the use of co-product biomass from thinning as a renewable energy source. Thinning was carried out through cut-to-length harvesting method, in which large logs for sawmill and small logs for energy were produced. In addition, tops, needles, barks, and branches were considered as co-products. The balance between consumed energy and emitted CO2 by machines for thinning in relationship to the energy and CO2 in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass energy; Co-product forest biomass; Forest harvesting; Sustainability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700861

Effect of herbicides in the oxidative stress in crop winter species
Provedor de dados: 42
Autores: ALVES,CARLA; COSTA,EDUARDA; SOFIATTI,JESSICA R.; FORTE,CESAR T.; WINTER,FÁBIO L.; HOLZ,CINTHIA M.; KAIZER,ROSILENE R.; GALON,LEANDRO.
ABSTRACT Most herbicides applied in crop field, stay in the soil for a period, affecting next crop or even the plants using as green manure. Nowadays, the use of herbicides grow to increase productivity, mainly in the grain producing region north of Rio Grande do Sul state. The objective of this study was to evaluate the effects of herbicides fomesafen and sulfentrazone on antioxidant system in Avena sativa1, Vicia sativa2, Raphanus sativus and Lupinus albus. The plants were exposed to varying concentrations of fomesafen3 (0, 0.125, 0.25 and 0.5 kg ha -1) and sulfentrazone (0, 0.3, 0.6 and 1.2 kg ha-1). For this, the activities of, ascorbat peroxidase, catalase and guaiacol enzymes were analyzed, and the levels of MDA were quantificated. Fomesafen and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Enzymes; Agricultural plants; PROTOX system.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401533

Maize dry matter production and macronutrient extraction model as a new approach for fertilizer rate estimation
Provedor de dados: 42
Autores: MARTINS,KARLA V.; DOURADO-NETO,DURVAL; REICHARDT,KLAUS; FAVARIN,JOSÉ L.; SARTORI,FELIPE F.; FELISBERTO,GUILHERME; MELLO,SIMONE C.
ABSTRACT Decision support for nutrient application remains an enigma if based on soil nutrient analysis. If the crop could be used as an auxiliary indicator, the plant nutrient status during different growth stages could complement the soil test, improving the fertilizer recommendation. Nutrient absorption and partitioning in the plant are here studied and described with mathematical models. The objective of this study considers the temporal variation of the nutrient uptake rate, which should define crop needs as compared to the critical content in soil solution. A uniform maize crop was grown to observe dry matter accumulation and nutrient content in the plant. The dry matter accumulation followed a sigmoidal model and the macronutrient content a power...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maize; Fertilizer rate estimation; Nutrient content; Nutrient partition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200705

Pollen grain morphology of Fabaceae in the Special Protection Area (SPA) Pau-de-Fruta, Diamantina, Minas Gerais, Brazil
Provedor de dados: 42
Autores: LUZ,CYNTHIA F.P. DA; MAKI,ERICA S.; HORÁK-TERRA,INGRID; VIDAL-TORRADO,PABLO; MENDONçA FILHO,CARLOS VICTOR.
The presented paper considered the pollen morphology of thirteen species belonging to seven genera of the Fabaceae family occurring in the Pau-de-Fruta Special Protection Area (SPA), Diamantina, state of Minas Gerais, Brazil. The pollen grains of six species ofChamaecrista [C. cathartica (Mart.) H.S. Irwin &amp; Barneby, C. debilis Vogel, C. flexuosa (L.) Greene, C. hedysaroides (Vogel) H.S. Irwin &amp; Barneby, C. glandulosa (L.) Greene, and C. papillata H.S. Irwin &amp; Barneby] have a similar morphology, characterized by three long colporated apertures with a central constriction. The species share specific morphological features regarding pollen size, endoaperture type (circular, lalongate or lolongate) and SEM ornamentation patterns of the exine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Espinhaço Southern Mountain Range; Fabaceae; Palynology; Pollen morphology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401329

Characteristics, distribution and diagenetic stages of chert in the La Silla Formation (Lower Ordovician), Argentine Precordillera
Provedor de dados: 42
Autores: Raviolo,Mariana M.; Barbosa,José A.; Neumann,Virgínio H.
The late Cambrian - late Tremadocian La Silla Formation is a carbonate unit of the eastern Precordillera in Argentina whose facies indicate a shallow platform environment. Until this moment, there were no studies that referred to the diagenetic evolution of these rocks. The present study involves the characteristics and distribution of the silicification that affects this unit and determines its different diagenetic stages through petrographic (with cathodoluminescence support) and stratigraphic analyses. An early diagenetic chert, in a stage previous to the compactation, was observed. This chert is related to silica-rich seawater in contact with permeable and porous sediments. A later pulse of chert, associated with fracturing, also occurs. The knowledge...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbonates; Chert; Early diagenesis; Eastern Precordillera; Lower Ordovician.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400015

Pollen-ovule relation in Adesmia tristis and reflections on the seed–ovule ratio by interaction with pollinators in two vertical strata
Provedor de dados: 42
Autores: FERREIRA,NADILSON R.; FRANKE,LUCIA B.; BLOCHTEIN,BETINA.
The vertical distribution of pollinators is an important component in the foraging pattern of plants strata, and it influences the reproductive system (pollen/ovule ratio) and seed/ovule ratio. Niches in two different strata from Adesmia tristis Vogel were evaluated in these aspects. This plant is an endemic shrub from the Campos de Cima da Serra in Southern Brazil. The studies were carried out from January 2010, to January 2011, at Pró-Mata/PUCRS (Catholic University of Rio Grande do Sul) (29°27′-29°35′S and 50°08′-50°15′W), São Francisco de Paula, sate of Rio Grande do Sul, Brazil. Breeding system of A. tristis is mandatory allogamy. The vertical profile in A. tristis has differentiated foraging niches among the most common pollinators. Bees of Megachile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allogamy; Bees; Foraging; Niches; Pollination deficit.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301327

Athelia (Sclerotium) rolfsii in Allium sativum: potential biocontrol agents and their effects on plant metabolites
Provedor de dados: 42
Autores: CAVALCANTI,VYTÓRIA P.; ARAÚJO,NEILTON A.F.; SCHWANESTRADA,KÁTIA R.F.; PASQUAL,MOACIR; DÓRIA,JOYCE.
Abstract Garlic (Allium sativum L.) plays an important role in popular culture due to its dietary and medicinal uses. It is also used to produce a wide range of pharmacologically interesting molecules. Several pathogens affect garlic plants, especially Athelia (Sclerotium) rolfsii, a fungus that is widespread and causes large economic losses. It causes direct damage to crops and leads to plant stress, which induces secondary metabolite production in plants. The use of microorganisms as biocontrol agents may induce the production of beneficial metabolites in plants that will protect it and promote resistance to pathogen attack. In addition to suppressing disease, biological control agents may have elicitor effects that could induce an increase in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Phytopathogen; Yeast; Bacillus spp.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703949

Nutritional parameters of steers receiving different levels of sunflower crushed in partial replacement of soybean meal
Provedor de dados: 42
Autores: LIMA,HELLEN L.; GOES,RAFAEL H.T.B. DE; CERILO,SARA L.N.; OLIVEIRA,EUCLIDES R. DE; GRESSLER,MARIA G.M.; BRABES,KELLY C.S.
ABSTRACTTo evaluate of the sunflower crushed in nutritional parameters in steers, supplemented at pasture, we used four steers in 4×4 Latin square design. The supplements were provided in 6 g-kg of body weight-animal-day, consisting of sunflower crushed, corn, soybean meal and mineral. All the supplements was isonitrogenous and soybean meal was replaced in 0, 20, 40, and 60% for sunflower crushed. The determination of ruminal pH and ammonia was at 0, 2, 4, 6 and 8 h. after feeding and for short-chain fatty acids it was collected at 0 and 6 h. post-feeding. The dry matter intake was not affected (P&gt;0.05) by inclusion of sunflower crushed (mean=6.59 kg-day). There was no significant effect (P&gt;0.05) for pH for the inclusion of sunflower crushed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acid; Ammonia; PH; By-product; Supplementation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401513

Do the changes in temperature and light affect the functional response of the benthic mud snail Heleobia australis (Mollusca: Gastropoda)?
Provedor de dados: 42
Autores: MAGALHÃES,THAISA R.F.; NEVES,RAQUEL A.F.; VALENTIN,JEAN L.; FIGUEIREDO,GISELA M.
The aim of this study was to determine the influence of temperature increase combined to conditions of light incidence on functional response of Heleobia australis. Experiments were conducted using nine to ten food concentrations for each treatment: 20°C without light; 30°C without light and, 30°C under low light intensity. For each experiment, the functional response type III (sigmoidal) was fitted and equation parameters were determined. Results suggest that, if the sediment temperature increases, H. australis will not have its ingestion rates affected negatively, whilst its feeding behavior seems to be negatively affected by light. Ingestion rates estimated for organic content in the Guanabara Bay were: 0.34 µgC ind–1h–1 at 20°C without light, 1.44 µgC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrobiid; Ingestion rates; Estuarine system; Gastropod.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301197

Human Heat stress risk prediction in the Brazilian semiarid Region based on the Wet-Bulb Globe Temperature
Provedor de dados: 42
Autores: OLIVEIRA,BEATRIZ FÁTIMA A. DE; SILVEIRA,ISMAEL HENRIQUE; FEITOSA,RENATO C.; HORTA,MARCO AURÉLIO P.; JUNGER,WASHINGTON L.; HACON,SANDRA.
Abstract: Objective: the aim of this study is to map thermal stress risks for human health at the São Francisco River Basin (SFRB) in the Semiarid region, for climatic scenarios RCP 4.5 and 8.5. Methods: The heat stress conditions were defined by the Wet Bulb Globe Temperature (WBGT) indicator and by the average number of annual days in which the WBGT values exceeded the 90th percentile of the reference period. The WBGT was estimated for the climate scenarios RCP 4.5 (intermediate) and 8.5 (pessimistic) for the period 2011-2090 comparing to the period of reference (1961-2005). Results: The projections show that for the pessimistic scenario practically all municipalities of the SFRB region can reach values of WBGT that indicate a high risk for heat stress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Heat stress; Health impacts; Wet Bulb Globe Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500808

Citizen science participation in research in the environmental sciences: key factors related to projects’ success and longevity
Provedor de dados: 42
Autores: CUNHA,DAVI G.F.; MARQUES,JONATAS F.; RESENDE,JULIANA C. DE; FALCO,PATRÍCIA B. DE; SOUZA,CHRISLAINE M. DE; LOISELLE,STEVEN A.
ABSTRACT The potential impacts of citizen science initiatives are increasing across the globe, albeit in an imbalanced manner. In general, there is a strong element of trial and error in most projects, and the comparison of best practices and project structure between different initiatives remains difficult. In Brazil, the participation of volunteers in environmental research is limited. Identifying the factors related to citizen science projects’ success and longevity within a global perspective can contribute for consolidating such practices in the country. In this study, we explore past and present projects, including a case study in Brazil, to identify the spatial and temporal trends of citizen science programs as well as their best practices and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citizen science; Community-based monitoring; Environmental management; Public participation; Volunteer data collection.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502229

Estimated evolution of total pollutant gas emissions associated with vehicle activity in the Metropolitan Region of Porto Alegre until 2030
Provedor de dados: 42
Autores: CHOVERT,ANGEL D.; ALONSO,MARCELO F.
ABSTRACT In recent years, the majority of economic sectors in Brazil have gone through processes of development and transformation. These processes have led to increases in environmental pollution of all kinds; air pollution being one of the most adverse. The Brazilian transportation sector, which heavily affects the air quality, experienced a significant increase in its vehicle fleet thus provoking larger emissions of pollutant gases, mainly in regions with high population density such as the Metropolitan Region of Porto Alegre (MRPA). Within this research, considering mainly the ozone precursor species and Carbon Monoxide and using the year 2001 as a base year, scenarios are obtained for vehicular emissions of pollutant gases in the MRPA until the year...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution; Bottom-up; Emission scenarios; Vehicle fleet.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000501971

Geodesics without conjugate points and curvatures at infinity
Provedor de dados: 42
Autores: MENDONÇA,SÉRGIO; ZHOU,DETANG.
We study the asymptotic behavior of curvature and prove that the integral of curvature along a geodesic without conjugate points is nonpositive and some generalizations of Myers theorem and Cohn-Vossen's theorem. Some applications are also given.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riemannian manifold; Geodesic; Conjugate point.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200002

Zingiber officinale formulation reduces hepatic injury and weight gain in rats fed an unhealthy diet
Provedor de dados: 42
Autores: LEAL,DALILA T.; FONTES,GLEIDE G.; VILLA,JULIA K.D.; FREITAS,RODRIGO B.; CAMPOS,MATEUS G.; CARVALHO,CAMILO A.; PIZZIOLO,VIRGINIA R.; DIAZ,MARISA A.N.
Abstract: This study investigated the ability of formulation containing Zingiber officinale (ginger) to reverse health changes promoted by unhealthy diet in Wistar rats. Five compounds from the gingerol family and three from the shogaol family were identified in the chromatographic analyzes of the extract. The animals were fed a combination of unhealthy foods, the cafeteria diet, which promoted increases in body weight, hepatocyte nucleus area, total hepatocyte area and liver fat accumulation, as well as reduced hepatic glutathione S-transferase concentration, compared to the control group, which received commercial chow. The treatment with ginger improved all these results, highlighting the reduction of 10% of body weight and 66% of the total area of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cafeteria diet; Gingerol; Nonalcoholic fatty liver disease; Oxidative stress; Shogaol; Zingiber officinale.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700801

Anesthesia of Epinephelus marginatus with essential oil of Aloysia polystachya: an approach on blood parameters
Provedor de dados: 42
Autores: FOGLIARINI,CARINE O.; GARLET,QUELEN I.; PARODI,THAYLISE V.; BECKER,ALEXSSANDRO G.; GARCIA,LUCIANO O.; HEINZMANN,BERTA M.; PEREIRA,ANA MARIA S.; BALDISSEROTTO,BERNARDO.
ABSTRACT This study investigated the anesthetic potential of the essential oil (EO) of Aloysia polystachya in juveniles of dusky grouper (Epinephelus marginatus). Fish were exposed to different concentrations of EO of A. polystachya to evaluate time of induction and recovery from anesthesia. In the second experiment, fish were divided into four groups: control, ethanol and 50 or 300 µL L−1 EO of A. polystachya, and each group was submitted to induction for 3.5 min and recovery for 5 or 10 min. The blood gases and glucose levels showed alterations as a function of the recovery times, but Na+ and K+ levels did not show any alteration. In conclusion, the EO from leaves of A. polystachya is an effective anesthetic for dusky grouper, because anesthesia was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthetic efficacy; Blood gases; Glucose; Hemoglobin; Plasma ion levels.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200445

Natural Compounds from Mexican Medicinal Plants as Potential Drug Leads for Anti-Tuberculosis Drugs
Provedor de dados: 42
Autores: GÓMEZ-CANSINO,ROCIO; GUZMÁN-GUTIÉRREZ,SILVIA LAURA; CAMPOS-LARA,MARÍA GUADALUPE; ESPITIA-PINZÓN,CLARA INES; REYES-CHILPA,RICARDO.
ABSTRACT In Mexican Traditional Medicine 187 plant species are used in the treatment of respiratory conditions that may be associated with tuberculosis. In this contribution, we review the ethnobotany, chemistry and pharmacology of 63 species whose extracts have been assayed for antimycobacterial activity in vitro. Among these, the most potent is Aristolochia brevipes (MIC= 12.5 µg/mL), followed by Aristolochia taliscana, Citrus sinensis, Chrysactinia mexicana, Persea americana, and Olea europaea (MIC&lt;64 µg/mL). Other potent extracts (inhibition &gt; 95%, 50 µg/mL) include: Amphipterygium adstringens, Larrea divaricata, and Phoradendron robinsoni. Several active compounds have been identified, the most potent are: Licarin A (isolated from A. taliscana),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuberculosis; Medicinal plants; Natural products; Mycobacterium tuberculosis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100031

Occurrence of Cymbasoma longispinosum Bourne, 1890 (Copepoda: Monstrilloida) in the Curuçá River estuary (Amazon Littoral)
Provedor de dados: 42
Autores: Leite,Natália R.; Pereira,Luci C.C.; Abrunhosa,Fernando; Pires,Marcus A.B.; Costa,Rauquírio M. da.
The present work was carried out to verify the occurrence and distribution of Cymbasoma longispinosum Bourne, 1890 in a tropical Amazon estuary from North Brazil. Samplings were performed bimonthly from July/2003 to July/2004 at two different transects (Muriá and Curuçá rivers) situated along the Curuçá estuary (Pará, North Brazil). Samples were collected during neap tides via gentle (1 to 1.5 knots) 200 μm-mesh net tows from a small boat. Additional subsurface water samples were collected for the determination of environmental parameters. Males and females of Cymbasoma longispinosum were only observed during September and November/2003. The highest number of organisms was found in September/2003 at the Muriá River transect. The presence of C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon region; Monstrilloida; New occurrence; Tropical estuary.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300005

Zooplankton community attributes in an oligo-mesotrophic reservoir: A comparative study of two sampling strategies
Provedor de dados: 42
Autores: MACÊDO,RAFAEL L.; LOPES,VANESSA G.; KOZLOWSKYSUZUKI,BETINA; BRANCO,CHRISTINA W.C.
Abstract Studies of the limnetic zooplankton in Brazilian freshwater have been done using several sampling strategies which are frequently associated to personal preferences, system constraints and objectives of the studies. It is known that a better sampling technique exists for each group of investigated zooplankton. So, the challenge is to provide a good sampling method for all groups at once. Regarding this theme we are contributing by pointing out the merits and demerits of two collecting methods of zooplankton widely used in many studies in Brazilian reservoirs to clarify the information about communities’ structure in past published and non-published biological data and also find a more useful sampler for future studies. Two simultaneous strategies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bucket sampling; Freshwater mesozooplankton; Plankton collection methods; Sub-sampling; Vertical hauls.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100603

Non-holonomic connections following Élie Cartan
Provedor de dados: 42
Autores: KOILLER,JAIR; RODRIGUES,PAULO R.; PITANGA,PAULO.
In this note we revisit E. Cartan's address at the 1928 International Congress of Mathematicians at Bologna, Italy. The distributions considered here will be of the same class as those considered by Cartan, a special type which we call strongly or maximally non-holonomic. We set up the groundwork for using Cartan's method of equivalence (a powerful tool for obtaining invariants associated to geometrical objects), to more general non-holonomic distributions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Non-holonomic mechanics; Cartan's equivalence method; Affine connections.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200003

Pharmacological perspectives from Brazilian Salvia officinalis (Lamiaceae): antioxidant, and antitumor in mammalian cells
Provedor de dados: 42
Autores: GARCIA,CHARLENE S.C.; MENTI,CAROLINE; LAMBERT,ANA PAULA F.; BARCELLOS,THIAGO; MOURA,SIDNEI; CALLONI,CAROLINE; BRANCO,CÁTIA S.; SALVADOR,MIRIAN; ROESCH-ELY,MARIANA; HENRIQUES,JOÃO A.P.
ABSTRACT Salvia officinalis (Lamiaceae) has been used in south of Brazil as a diary homemade, in food condiment and tea-beverage used for the treatment of several disorders. The objective of this study was to characterize chemical compounds in the hydroalcoholic (ExtHS) and aqueous (ExtAS) extract from Salvia officinalis (L.) by gas chromatography-mass spectrometry (GC-MS) and by high-resolution electrospray ionization mass spectrometry (ESI-QTOF MS/MS), evaluate in vitro ability to scavenge the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH•) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS•+), catalase (CAT-like) and superoxide dismutase (SOD-like) activity, moreover cytotoxic by MTT assay, alterations on cell morphology by giemsa and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Apoptosis; Cancer; Chemical compounds; Salvia officinalis (L.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100281

An overview of chagasic cardiomyopathy: pathogenic importance of oxidative stress
Provedor de dados: 42
Autores: Zacks,Michele A.; Wen,Jian-Jun; Vyatkina,Galina; Bhatia,Vandanajay; Garg,Nisha.
There is growing evidence to suggest that chagasic myocardia are exposed to sustained oxidative stress-induced injuries that may contribute to disease progression. Pathogen invasion- and replication-mediated cellular injuries and immune-mediated cytotoxic reactions are the common source of reactive oxygen species (ROS) in infectious etiologies. However, our understanding of the source and role of oxidative stress in chagasic cardiomyopathy (CCM) remains incomplete. In this review, we discuss the evidence for increased oxidative stress in chagasic disease, with emphasis on mitochondrial abnormalities, electron transport chain dysfunction and its role in sustaining oxidative stress in myocardium. We discuss the literature reporting the consequences of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chagasic cardiomyopathy; Reactive oxygen species; Inflammation; Mitochondria; Oxidant/antioxidant status; Oxidative damage.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400009

HOW STRONG IS THE RELATIONSHIP BETWEEN RAINFALL VARIABILITY AND CAATINGA PRODUCTIVITY? A CASE STUDY UNDER A CHANGING CLIMATE
Provedor de dados: 42
Autores: SALIMON,CLEBER; ANDERSON,LIANA.
ABSTRACT Despite the knowledge of the influence of rainfall on vegetation dynamics in semiarid tropical Brazil, few studies address and explore quantitatively the various aspects of this relationship. Moreover, Northeast Brazil is expected to have its rainfall reduced by as much as 60% until the end of the 21st Century, under scenario AII of the IPCC Report 2010. We sampled and analyzed satellite-derived monthly rainfall and a vegetation index data for 40 sites with natural vegetation cover in Paraíba State, Brazil from 2001 to 2012. In addition, the anomalies for both variables were calculated. Rainfall variation explained as much as 50% of plant productivity, using the vegetation index as a proxy, and rainfall anomaly explained 80% of the vegetation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paraíba; Rainfall anomaly; Ecosystem productivity; Semiarid; Vegetation index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502121

Secondary metabolites from marine microorganisms
Provedor de dados: 42
Autores: KELECOM,ALPHONSE.
After 40 years of intensive research, chemistry of marine natural products has become a mature field. Since 1995, there are signals of decreased interest in the search of new metabolites from traditional sources such as macroalgae and octocorals, and the number of annual reports on marine sponges stabilized. On the contrary, metabolites from microorganisms is a rapidly growing field, due, at least in part, to the suspicion that a number of metabolites obtained from algae and invertebrates may be produced by associated microorganisms. Studies are concerned with bacteria and fungi, isolated from seawater, sediments, algae, fish and mainly from marine invertebrates such as sponges, mollusks, tunicates, coelenterates and crustaceans. Although it is still to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Fungi; Alkaloids; Despsipeptides; Terpenoids; Acetogenins; Biological activities.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100012

Pedology and plant physiognomies in the cerrado, Brazil
Provedor de dados: 42
Autores: NERI,ANDREZA V.; SCHAEFER,CARLOS E.G.R.; SOUZA,AGOSTINHO L.; FERREIRA-JUNIOR,WALNIR G.; MEIRA-NETO,JOÃO A.A.
This study was carried out in Paraopeba National Reserve. It aims to classify and evaluate the soil of the studied area and to verify the influence of soil attributes on vegetation by testing the following hypotheses: 1) under woodland physiognomies (Cerradão) the soil fertility is higher and the Al content lower; 2) open savanna occurs only in areas with high Al contents. For this purpose, representative soils in the Paraopeba National Reserve were mapped, identified, and samples from five profiles were analyzed. The environmental gradient was easily observed by principal components analyses, where the differences between the sites were highlighted. The Spearman correlation was used to verify the hypothesis. The correlation between vegetation (basal area,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum tolerance; Brazilian savanna; Edaphic features; Soil fertility; Soil-vegetation gradient.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100087

Inflated Kumaraswamy distributions
Provedor de dados: 42
Autores: CRIBARI-NETO,FRANCISCO; SANTOS,JÉSSICA.
Abstract: The Kumaraswamy distribution is useful for modeling variables whose support is the standard unit interval, i.e., (0, 1). It is not uncommon, however, for the data to contain zeros and/or ones. When that happens, the interest shifts to modeling variables that assume values in [0, 1), (0, 1] or [0, 1]. Our goal in this paper is to introduce inflated Kumaraswamy distributions that can be used to that end. We consider inflation at one of the extremes of the standard unit interval and also the more challenging case in which inflation takes place at both interval endpoints. We introduce inflated Kumaraswamy distributions, discuss their main properties, show how to estimate their parameters (point and interval estimation) and explain how testing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inflated distribution; Kumaraswamy distribution; Likelihood ratio test; Maximum likelihood estimation; Score test; Wald test.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300201

Biodiversity: the chasm between what we know and we need to know.
Provedor de dados: 42
Autores: MAGNUSSON,WILLIAM E.
Abstract: In this review I focus on what we need to know to make decisions relevant to land-use planning. I discuss four questions: What information about the distribution of biodiversity is available to decision makers? What sort of information is required at a local scale? Can we use species-distribution modeling to compensate for the lack of empirical information at larger scales? Can we use surrogates based on remote sensing for all our decisions? To be effective, biodiversity information needs to be based on standardized sampling with data made available during the initial planning phases of infrastructure projects, which are now based only on engineering or social considerations and occur several decades before construction starts. The RAPELD method...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Research; Finance; Geographical bias; Management; Systematic conservation planning.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600601

Hydrothermal features in the Catalão I Carbonatite Complex, Goiás
Provedor de dados: 42
Autores: Ribeiro,Carlos C.; Gaspar,José C.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400025

Towards an understanding of the interactions of Trypanosoma cruzi and Trypanosoma rangeli within the reduviid insect host Rhodnius prolixus
Provedor de dados: 42
Autores: Azambuja,Patrícia; Ratcliffe,Norman A.; Garcia,Eloi S.
This review outlines aspects on the developmental stages of Trypanosoma cruzi and Trypanosoma rangeli in the invertebrate host, Rhodnius prolixus. Special attention is given to the interactions of these parasites with gut and hemolymph molecules and the effects of the organization of midgut epithelial cells on the parasite development. The vector insect's permissiveness to T. cruzi, which develops in the vector gut, largely depends on the host nutritional state, the parasite strain and the molecular interactions with trypanolytic compounds, lectins and resident bacteria in the gut. T. rangeli invades the hemocoel and once in the hemolymph, can be recognized and activates the defense system of its insect vector, i.e., the prophenoloxidase system,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosomes; Rhodnius prolixus; Vector; Parasites.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300004

Sedimentation processes and beach morphodynamics active at the Doce River mouth, Espírito Santo State, Brazil
Provedor de dados: 42
Autores: Albino,Jacqueline; Suguio,Kenitiro.
The coastal sedimentation model in the Doce River mouth and surroundings extends beyond the hydraulic jetty effect created by its stream-flow. During flooding, marine sediments transported by longshore currents are retained on the updrift side, causing strandline progradation. As the longshore current direction varies, local depositional and erosional effects can be produced and identified laterally within beach profiles from north and south of the Doce River mouth area. Sedimentological studies carried out in this river, beach and adjacent inner continental shelf sands showed that, at present, the influence of Doce River sediments is restricted to the area surrounding its mouth. Meanwhile, beach morphodynamic stages and present-day coastal-plain processes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal processes; Beach morphodynamics; Quaternary evolution; Doce River; Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400023

Dirac's æther in curved spacetime
Provedor de dados: 42
Autores: OLIVEIRA,ALEXANDRE L.; TEIXEIRA,ANTONIO F. F.
Proca's equations for two types of fields in a Dirac's æther with electric conductivity sigma are solved exactly. The Proca electromagnetic fields are assumed with cylindrical symmetry. The background is a static, curved spacetime whose spatial section is homogeneous and has the topology of either the three-sphere S³ or the projective three-space P³. Simple relations between the range of Proca field lambda, the Universe radius R, the limit of photon rest mass mgamma and the conductivity sigma are written down.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dirac's æther; Proca Field; Curved spacetime; Three-sphere; Projective three-space.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200004

Cryopreservation of banana’s cv Grand Naine in vitro rhizomes
Provedor de dados: 42
Autores: LONDE,LUCIANA C.N.; VENDRAME,WAGNER A.; SANAEI,MASSY; OLIVEIRA,ALEXANDRE B. DE.
ABSTRACT The preservation of banana genetic material is usually performed through seedlings. However, most banana cultivars do not produce seed and are propagated vegetatively. Therefore, cryopreservation is a feasible technique that allows the preservation of banana genotypes indefinitely. For the success of cryopreservation protocols, the selection of cryoprotectants and pre-freezing techniques are important factor. Therefore, the objective of this study was to verify the effects of different cryoprotectants with and without 1% phloroglucinol and pre-cooling periods on the development of a protocol for cryopreservation of in vitro rhizomes ofMusa accuminata(AAA) cv Grand Naine banana. The addition of 1% phloroglucinol to the cryoprotective solutions,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa acumminata; In vitro conservation; Cryoprotectants; Pre-cooling.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100495

SHRIMP U-Pb zircon dating of Pedras Grandes Suite, southern Santa Catarina State, Brazil
Provedor de dados: 42
Autores: Jelinek,Andréa R.; Bastos-Neto,Artur C.; Leite,Jayme A.D.; Hartmann,Léo A.; McNaughton,Neal J.
Two major magmatic pulses of the granitic Florianópolis Batholith in Santa Catarina State, southern Brazil, occurred between 613±5Ma and 595±5 Ma, during the Neoproterozoic Brasiliano Cycle. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at 180?C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SHRIMP; Pedras Grandes Suite; Zircon; Geochronology; Fluorite.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100010

On clutch size and hatching success of the South American turtles Podocnemis expansa (Schweigger, 1812) and P. unifilis Troschel, 1848 (Testudines, Podocnemididae)
Provedor de dados: 42
Autores: Vanzolini,Paulo Emilio.
Data on clutch size and hatching success of P. expansa were gathered for seven beaches traditionally used by the species and re-analyzed statistically by means of regression analysis, of the number of eggs on the number of females (or nests) and of the number of young on the number of eggs. All regressions were linear, passed through the origin and had excellent fits. Average clutch size varied from 75 to 123, and presented geographic differentiation: (i) Rio Orinoco, (ii) Rio Trombetas + Rio Branco and (iii) Rio Juruá + Rio Purus. Average hatching success was ca. 83%. In P. unifilis there was also geographic variation in clutch size, the Iquitos area showing the highest values. Hatching success of P. unifilis was uniformly high: only one sample, from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Turtle reproduction; Hatching success; Clutch size; Optimal egg-size theory; Podocnemis expansa; Podocnemis unifilis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400002

Effects of primaquine and chloroquine on oxidative stress parameters in rats
Provedor de dados: 42
Autores: GIOVANELLA,FRANCIANNE; FERREIRA,GABRIELA K.; PRÁ,SAMIRA D.T. DE; CARVALHO-SILVA,MILENA; GOMES,LARA M.; SCAINI,GISELLI; GONÇALVES,RENATA C.; MICHELS,MONIQUE; GALANT,LETÍCIA S.; LONGARETTI,LUIZA M.; DAJORI,ANA LUIZA; ANDRADE,VANESSA M.; DAL-PIZZOL,FELIPE; STRECK,EMILIO L.; SOUZA,RENAN P. DE.
Primaquine and chloroquine are used for the treatment of malaria; evidence from the literature suggests that these drugs may induce oxidative stress. In this study we investigated the effects of primaquine and chloroquine on oxidative damage and DNA damage in brain, liver and kidney of rats after 7, 14 and 21 days of administration. Our results demonstrated that primaquine causes DNA damage in brain after 7, 14 and 21 days, and in liver after 7 and 14 days. Moreover, primaquine increases TBARS levels in the kidney and protein carbonyls in the brain after 14 days, and decreases protein carbonyls in the liver after 7 days. Whereas chloroquine causes DNA damage in the kidney after 7 and 14 days, and in the liver after 14 and 21 days, increases TBARS levels in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primaquine; Chloroquine; Oxidative damage; DNA damage; Antimalarial drugs.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301487

Spatial distribution of wood volume in Brazilian savannas
Provedor de dados: 42
Autores: SILVEIRA,EDUARDA M.O.; REIS,ALINY A. DOS; TERRA,MARCELA C.N.S.; WITHEY,KIERAN D.; MELLO,JOSÉ M. DE; ACERBI-JÚNIOR,FAUSTO W.; FERRAZ FILHO,ANTONIO CARLOS; MELLO,CARLOS R.
Abstract: Here we model and describe the wood volume of Cerrado Sensu Stricto, a highly heterogeneous vegetation type in the Savanna biome, in the state of Minas Gerais, Brazil, integrating forest inventory data with spatial-environmental variables, multivariate regression, and regression kriging. Our study contributes to a better understanding of the factors that affect the spatial distribution of the wood volume of this vegetation type as well as allowing better representation of the spatial heterogeneity of this biome. Wood volume estimates were obtained through regression models using different environmental variables as independent variables. Using the best fitted model, spatial analysis of the residuals was carried out by selecting a semivariogram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado sensu stricto; Forest inventory; Geostatistics; Regression kriging; Volumetry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700853

Evaluation of the photodynamic activity of Xanthene Dyes on Artemia salina described by chemometric approaches
Provedor de dados: 42
Autores: Pellosi,Diogo S.; Batistela,Vagner R.; Souza,Vagner R. de; Scarminio,Ieda S.; Caetano,Wilker; Hioka,Noboru.
The development of drugs for photodynamic therapy (PDT) is an important area of research due to their growing use in medical applications. Therefore, it is important to develop new bioassay methods for PDT photosensitizers that are inexpensive, easy to handle and highly sensitive to environmental conditions. Xanthene dyes (fluorescein, rose bengal B, erythrosine B and eosin Y) with LED light sources were investigated using Artemia salina as a bioindicator of photodynamic activity. In this study, three factors were investigated: (i) photosensitizers concentration, (ii) the LED irradiation time and (iii) the waiting time between the addition of the photosensitizers and the beginning of the irradiation. To analyze the photo-killing of A. salina, it was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artemia salina; Factorial design; Photodynamic therapy; Bioassay; Xanthenes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401267

Structure of potamoplankton along a gradient of preservation of riparian vegetation in subtropical streams
Provedor de dados: 42
Autores: PERESIN,DENISE; TORGAN,LEZILDA C.; SCHULZ,UWE H.; CROSSETTI,LUCIANE O.
Water quality in lotic and lentic systems is greatly influenced by the land use in the adjacent areas. This study was conducted in order to assess whether different degrees of preservation of riparian forest (from well preserved with 30m wide up to degraded with &lt; 5 m wide) influence potamoplankton community structure. The study was conducted in three streams in the upper region of the Rio dos Sinos basin, at four sampling sites, with different width of the forest. Samplings were gathered for abiotic and biological analysis in winter (August 2010) and summer (January/February 2011). The analysis of environmental and biotic variables indicated that seasonality was the main determinant of biomass patterns, regardless of the width of riparian vegetation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riparian forest; Water quality; Stream; Bioindicator.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200841

Counteracting the contemporaneous proliferation of digital forgeries and fake news
Provedor de dados: 42
Autores: FERREIRA,ALEXANDRE; CARVALHO,TIAGO; ANDALÓ,FERNANDA; ROCHA,ANDERSON.
Abstract Fake news has been certainly the expression of the moment: from political round table discussions to newspapers to social and mainstream media. It is everywhere. With such an intense discussion and yet few effective ways to combat it, what can be done? Providing methods to fight back even the least harming hoax is a social responsibility. To look for authenticity in a wide sea of fake news, every detail is a lead. Image appearance and semantic content of text and images are some of the main properties, which can be analyzed to reveal even the slightest lie. In this vein, this work overviews some recent methods applicable to the verification of dubious content in text and images, and discusses how we can put them together as an option to curb away...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital Forensics; Fake news; Visual analysis; Semantic analysis; X-Coherence; DéjàVu.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200902

Nutritional and non-nutritional habits and occurrence of malocclusions in the mixed dentition
Provedor de dados: 42
Autores: TRAEBERT,ELIANE; ZANINI,FRANCIELLE A.; NUNES,RODRIGO DIAS; TRAEBERT,JEFFERSON.
Abstract  Malocclusions are changes in the development of craniofacial structures of high prevalence. Associated risk factors are diverse and nutritional and non-nutritional suction habits are the most reported. The aim of this study was to estimate the prevalence of malocclusions in the mixed dentition and to study possible association with practices of breastfeeding and suction habits among Brazilian schoolchildren. A cross-sectional study involving a sample of 664 6-year-old children and their families was carried out. Data collection was done through interviews with mothers in the homes and oral examinations of children in schools. Multivariate analyses were performed using the Poisson regression with a robust estimator. The prevalence of overjet over...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malocclusions; Breast-feeding; Suction habits; Schoolchildren.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100906

Production of transgenic goat (Capra hircus) with human Granulocyte Colony Stimulating Factor (hG-CSF) gene in Brazil
Provedor de dados: 42
Autores: Freitas,Vicente J.F.; Serova,Irina A.; Andreeva,Lyudmila E.; Dvoryanchikov,Guennadi A.; Lopes-Jr.,Edilson S.; Teixeira,Dárcio I.A.; Dias,Luciene P.B.; Avelar,Suely R.G.; Moura,Raylene R.; Melo,Luciana M.; Pereira,Alexsandra F.; Cajazeiras,João B.; Andrade,Maria L.L.; Almeida,Karlliely C.; Sousa,Francisco C.; Carvalho,Antonio C.C.; Serov,Oleg L.
In order to produce transgenic goats with hG-CSF, a total of 24 adult Saanen and 48 adult undefined breed goats were used as donors and recipients, respectively. Donors were estrus-synchronized with vaginal sponges and superovulated by a treatment with 200 mg FSH given twice daily in decreasing doses over 3 days starting 48 h before sponge removal. Ovulation was induced by injecting 100µg GnRH 36 h after sponge removal. The recipients also received an estrus synchronization treatment. Donors were mated with fertile Saanen bucks and, approximately 72 h after sponge removal, zygotes were recovered surgically by flushing oviducts. The recovered zygotes were briefly centrifuged to a reliable visualization of the pronuclei. The DNA construct containing hG-CSF...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transgenesis; Goat; HG-CSF; DNA microinjection; Embryo.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400003

Conservation priorities of useful plants from different techniques of collection and analysis of ethnobotanical data
Provedor de dados: 42
Autores: Lucena,Reinaldo F.P. de; Lucena,Camilla M.; Araújo,Elcida L.; Alves,Ângelo G.C.; Albuquerque,Ulysses P. de.
This study analyzes three methods of data analysis to verify which one would be more appropriate to get information aiming the conservation, selecting the use value (VU) inventory in situ and conservation property index (IPC). It was developed in in Northeast Brazil, via interviewed householders (46 informants). The VU was calculated considering only the effective use of plants; the inventory in situ was made through the frequency of species occurrence in homes; and the IPC combining ethnobotanical and phytossociological data. It was observed a similar cast of the indicated species by VU and inventory in situ, being different from the IPC cast. As this study sought to analyze the best technique for species identification which were needing conservationist...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Caatinga; Inventory in situ; Priority index of conservation; Use value.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100169

Cancer, Photodynamic Therapy and Porphyrin-Type Derivatives
Provedor de dados: 42
Autores: GOMES,ANA T.P.C.; NEVES,MARIA G.P.M.S.; CAVALEIRO,JOSÉ A.S.
ABSTRACT This review has two parts. The first one gives an approach to interdisciplinary studies against cancer carried out by many scientists using porphyrin-type substrates as photosensitizers in PDT. Intensive studies were performed for almost six decades. The successes really started in 1993 with the first formulation patented under the trade name Photofrin, which was immediately approved in several countries to treat certain types of cancer. Photofrin is still used although certain negative features soon became well known. That has motivated the search for better new photosensitizers. Several ones were developed, evaluated and a few of them had clinical approval. This group includes porphyrin derivatives and pro-drugs (aminolevulinic acid and its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cancer; Photodynamic Therapy; Porphyrins; Chlorins; Related macrocycles.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000300993

From birdsong to speech: a plea for comparative approaches
Provedor de dados: 42
Autores: Todt,Dietmar.
Human language and speech are unique accomplishments. Nevertheless, they share a number of characteristics with other systems of communication, and investigators have thus compared them to birdsong and the vocal signaling of nonhuman primates. Particular interesting parallels concern the development of singing and speaking. These behaviors rely on auditory perception, subsequent memorization and finally, the generation of vocal imitations. Several mechanisms help young individuals to deal with the various challenges during the time of signal development. Specific differences aside, astounding parallels can be found also in how a human and a particularly accomplished bird like the Common Nightingale Luscinia megarhynchos treat the experience of many...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Song learning; Language acquisition; Speech segmentation; Units of interaction; Signal repertoires.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200003

Evaluation of protein extraction methods for enhanced proteomic analysis of tomato leaves and roots
Provedor de dados: 42
Autores: VILHENA,MILCA B.; FRANCO,MÔNICA R.; SCHMIDT,DAIANA; CARVALHO,GISELLE; AZEVEDO,RICARDO A.
Proteomics is an outstanding area in science whose increasing application has advanced to distinct purposes. A crucial aspect to achieve a good proteome resolution is the establishment of a methodology that results in the best quality and wide range representation of total proteins. Another important aspect is that in many studies, limited amounts of tissue and total protein in the tissue to be studied are found, making difficult the analysis. In order to test different parameters, combinations using minimum amount of tissue with 4 protocols for protein extraction from tomato (Solanum lycopersicum L.) leaves and roots were evaluated with special attention to their capacity for removing interferents and achieving suitable resolution in bidimensional gel...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bidimensional electrophoresis; Proteins; Protocol optimization; Tomato.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401853

Physiological parameters of Piaractus mesopotamicus (Osteichthyes: Characidae) exposed to a biopesticide based on Bacillus thuringiensis
Provedor de dados: 42
Autores: MARIANO,WAGNER S.; AZEVEDO,SAULO B.; GOMES,FRANCISCO L.; LIMA,LIANA B.D.; MORON,SANDRO E.; TAVARES-DIAS,MARCOS.
Abstract: This study investigated the physiological effects of a pesticide based on Bacillus thuringiensis (Dipel-WP®) added in the water and diet of Piaractus mesopotamicus during 24 and 48 h. It was added 0.13 g of de B. thuringiensis per kg of commercial feed; and for the fish subjected to the biopesticide in the water of the tanks, it was added 0.13 g/L of the biopesticide. Plasma levels of sodium, chloride, potassium, cholesterol, glucose, triglycerides, cortisol, total protein, alanine aminotransferase (ALT), aspartate aminotransferase (AST), hematocrit, hemoglobin, erythrocytes number, mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC), number of thrombocytes and leukocytes were determined. Cortisol, lactate, glucose,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemistry; Blood; Farm fish; Freshwater fish.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300612

The effects of an osmoregulator, carbohydrates and polyol on maturation and germination of ‘Golden THB’ papaya somatic embryos
Provedor de dados: 42
Autores: CHAGAS,KRISTHIANO; CIPRIANO,JAMILE L.D.; LOPES,JOSÉ CARLOS; SCHMILDT,EDILSON R.; OTONI,WAGNER C.; ALEXANDRE,RODRIGO S.
Abstract This study evaluated the effect of osmoregulators and carbohydrates on the maturation and germination of somatic embryos of papaya ‘Golden THB’. Cotyledon explants from papaya seedlings germinated in vitro on basal MS medium were cultured on somatic embryogenesis induction medium (IM) containing MS salts, myo-inositol, sucrose, agar and p-chlorophenoxyacetic acid. After 50 days, embryogenic calli were transferred onto maturation media (MM) for 45 additional days. For experiment 1, a MS-based medium supplemented with abscisic acid, activated charcoal and concentrations of PEG 6000 (0; 40; 50; 60 and 70 g L-1) was used, whereas for experiment 2 malt extract concentrations (0; 0.1; 0.2; 0.3 and 0.4 g L-1) were assessed. The normal cotyledonary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L; Malt extract; Myo-inositol; Polyethylene glycol.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703433

Treatment with either leflunomide or adalimumab reduces anaemia in patients with rheumatoid arthritis
Provedor de dados: 42
Autores: Pereira,Ione C.P.; Sousa,Nágila C.F.; Pereira,Domingos M.S.; Mendes,Saulo J.F.; Muniz,Thayanne F.; Colares,Valderlane L.P.; Silva,Bruna L.R.; Monteiro,Cinara R.A.V.; Martins,Mahiba M.R.S.; Fernandes,Anita M.R.; Fernandes,Elizabeth S.
ABSTRACT Rheumatoid arthritis is a chronic disease of the joints, which causes joint pain and disability. Anaemia is a frequent extra-articular manifestation in rheumatoid arthritis, affecting 30-70% of the patients; presenting a negative impact on patient´s quality of life. Some of the drugs used in rheumatoid arthritis treatment improve anaemia; but little is known on the beneficial effects of the anti-rheumatic leflunomide or the anti-TNFα adalimumab, in this parameter. We investigated the incidence of anaemia in rheumatoid arthritis patients treated or not with leflunomide or adalimumab. We also assessed whether anaemia correlates with disease activity. Anaemia was present in patients who had just been diagnosed with rheumatoid arthritis and had never...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaemia; Rheumatoid arthritis; Leflunomide; Adalimumab.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502161

A Holocene pollen record of savanna establishment in coastal Amapá
Provedor de dados: 42
Autores: Toledo,Mauro B. de; Bush,Mark B.
The main goal of this study was to investigate how climate and human activities may have influenced ecotonal areas of disjoint savannas within Brazilian Amazonia. The fossil pollen and charcoal records of Lake Márcio (Amapá) were used to provide a Holocene palaeoecological history of this region. Detrended correspondence analysis (DCA) was used to enhance the patterns of sample distribution along the sediment core. A marked vegetation change from closed forests with swamp elements to open flooded savanna at c. 5000 yrs BP was evident from the pollen record. Charcoal analysis revealed a pattern of increased accumulation of particles coincident with the establishment of savannas, suggesting higher fire frequency and human impacts near the lake. A 550-year...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen record; Palaeofires; Amazonia; Savannas; Climate change; Palaeoecology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200013

Characterization and bioactivities of a novel polysaccharide obtained from Gracilariopsis lemaneiformis
Provedor de dados: 42
Autores: SHI,CHEN-SHAN; SANG,YA-XIN; SUN,GUI-QING; LI,TIAN-YE; GONG,ZHENG-SI; WANG,XIANG-HONG.
ABSTRACT Gracilariopsis lemaneiformis is a type of red alga that contains seaweed polysaccharide agar. In this study, a novel non-agar seaweed polysaccharide fraction named GCP (short of crude polysaccharide obtained from Gracilariopsis lemaneiformis) was isolated from Gracilariopsis lemaneiformis. Structural analysis showed that GCP shows triple helical chain conformation when dissolved in water and has many branches and long side chains. Also, 1→3 linkage is the major linkage and the sugar structures are galactopyranose configurations linked by β-type glycosidic linkages. Two macromolecular substance fractions (GCP-1 and GCP-2) were purified by DEAE Sepharose Fast Flow column chromatography. Moreover, a splenocyte damage assay and splenocyte...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactivities; Gracilariopsis lemaneiformis; Polysaccharide; Structural characterization.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100175

Clinical and molecular aspects of severe malaria
Provedor de dados: 42
Autores: Kirchgatter,Karin; Del Portillo,Hernando A.
The erythrocytic cycle of Plasmodium falciparum presents a particularity in relation to other Plasmodium species that infect man. Mature trophozoites and schizonts are sequestered from the peripheral circulation due to adhesion of infected erythrocytes to host endothelial cells. Modifications in the surface of infected erythrocytes, termed knobs, seem to facilitate adhesion to endothelium and other erythrocytes. Adhesion provides better maturation in the microaerophilic venous atmosphere and allows the parasite to escape clearance by the spleen which recognizes the erythrocytes loss of deformability. Adhesion to the endothelium, or cytoadherence, has an important role in the pathogenicity of the disease, causing occlusion of small vessels and contributing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Severe malaria; Plasmodium falciparum; PfEMP1; Pathogenesis; Cytoadherence; Rosetting; Antigenic variation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300008

Active inductor based fully integrated CMOS transmit/ receive switch for 2.4 GHz RF transceiver
Provedor de dados: 42
Autores: Bhuiyan,Mohammad A.S.; Zijie,Yeoh; Yu,Jae S.; Reaz,Mamun B.I.; Kamal,Noorfazila; Chang,Tae G.
Modern Radio Frequency (RF) transceivers cannot be imagined without high-performance (Transmit/Receive) T/R switch. Available T/R switches suffer mainly due to the lack of good trade-off among the performance parameters, where high isolation and low insertion loss are very essential. In this study, a T/R switch with high isolation and low insertion loss performance has been designed by using Silterra 0.13µm CMOS process for 2.4GHz ISM band RF transceivers. Transistor aspect ratio optimization, proper gate bias resistance, resistive body floating and active inductor-based parallel resonance techniques have been implemented to achieve better trade-off. The proposed T/R switch exhibits 0.85dB insertion loss and 45.17dB isolation in both transmit and receive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Active inductor; CMOS; ISM band; T/r switch; Transceiver.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301089

Causes and consequences of song amplitude adjustment in a territorial bird: a case study in nightingales
Provedor de dados: 42
Autores: Brumm,Henrik.
Vocal amplitude, one of the crucial factors for the exchange of acoustic signals, has been neglected in studies of animal communication, but recent studies on song variation in Common Nightingales Luscinia megarhynchos have revealed new insights into its importance in the singing behavior of territorial birds. In nightingales song amplitude is not maximized per se, but is individually regulated according to the level of masking background noise. Also, birds adjust their vocal intensity according to social variables, as in male-male interactions. Moreover, during such interactions, males exploited the directionality of their songs to broadcast them in the direction of the intended receivers ensuring the most effective signal transmission. Studies of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic communication; Birdsong; Lombard effect; Background noise; Song development; Vocal amplitude.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200017

The synergetic modulation of the excitability of central gray matter by a neuropeptide: two protocols using excitation waves in chick retina
Provedor de dados: 42
Autores: Lima,Vera M.F. de; Piqueira,José R.C.; Hanke,Wolfgang.
The isolated chick retina provides an in vitro tissue model, in which two protocols were developed to verify the efficacy of a peptide in the excitability control of the central gray matter. In the first, extra-cellular potassium homeostasis is challenged at long intervals and in the second, a wave is trapped in a ring of tissue causing the system to be under self-sustained challenge. Within the neuropil, the extra-cellular potassium transient observed in the first protocol was affected from the initial rising phase to the final concentration at the end of the five-minute pulse. There was no change in the concomitants of excitation waves elicited by the extra-cellular rise of potassium. However, there was an increase on the elicited waves latency and/or a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extra-cellular potassium; Migraine; Neuronal-glial dynamics; Somatostatin; Spread depression.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100006

Optimal image quantization, perception and the median cut algorithm
Provedor de dados: 42
Autores: MOTA,CICERO; GOMES,JONAS; CAVALCANTE,MARIA I. A.
We study the perceptual problem related to image quantization from an optimization point of view, using different metrics on the color space. A consequence of the results presented is that quantization using histogram equalization provides optimal perceptual results. This fact is well known and widely used but, to our knowledge, a proof has never appeared on the literature of image processing.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Image quantization; Color quantization; Optimization; Median cut; Information theory.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300001

Phaeosphaeria deschampsii (Ascomycota): A new parasite species of Deschampsia antarctica (Poaceae) described to Antarctica
Provedor de dados: 42
Autores: PUTZKE,JAIR; PEREIRA,ANTONIO B.
ABSTRACT This study presents the description of Phaeosphaeria deschampsii, which was found in plant communities from Half Moon Island, South Shetland Archipelago, Antarctica, in February 2014. Many patches of Deschampsia antarctica (Poaceae), the only indigenous Poaceae specie in Antarctic, were found dead, parasitized by a fungi pathogen. Based on the shape of its perithecia, with oblique neck, erumpent in the grass tissues, ascospore form and septation, the specie was identified as new to science.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antarctica; Ascomycota; Grass; Phytopathology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501967

Nutrient release by a Brazilian sedimentary zeolite
Provedor de dados: 42
Autores: Monte,Marisa B.M.; Middea,Antonieta; Paiva,Paulo R.P.; Bernardi,Alberto C.C.; Rezende,Nélio G.A.M.; Baptista-Filho,Milton; Silva,Marcelo G.; Vargas,Helion; Amorim,Helio S.; Souza-Barros,Fernando de.
This report describes the characterization of a sedimentary occurrence from the Parnaíba Basin, Brazil, containing the zeolite stilbite intertwined with smectitic clay mineral. The head samples from different sites present a wide content range of the zeolitic phase - 15% to 50%. The use of simple separation techniques - conventional gravitic treatments - yields concentrates containing about 67% of the zeolitic component. Assays with the amendments of these concentrates with plant nutrients yield release rates matching those reported for similar commercial products.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentary zeolite; Parnaíba Basin; Plant nutrients; Nutrient attachment and release.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400003

Impact of the timing and duration of weed control on the establishment of a rubber tree plantation
Provedor de dados: 42
Autores: GUZZO,CAIO D.; CARVALHO,LEONARDO B. DE; GIANCOTTI,PAULO R.F.; ALVES,PEDRO L.C.A.; GONÇALVES,ELAINE C.P.; MARTINS,JOSÉ V.F.
Rubber tree production is reduced by weeds that compete for environmental resources; therefore, the timing and duration of weed control influences weed interference. The objectives of this study were to evaluate the growth of rubber tree (Hevea brasiliensis) plants, to determine the critical period for weed control, and to evaluate the growth recovery of rubber trees that coexisted with weeds for different periods of time after planting. Two groups of treatments were established under field conditions in the first year of the investigation: one group contained crescent periods of weed infestation, while the other contained crescent periods of weed control, also including a weed-free check and a total weedy check. In the second year of the investigation,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Weed interference; Critical period for weed control; Growth recovery.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100495

Essential oils of green cumin and chamomile partially protect against acute acetaminophen hepatotoxicity in rats
Provedor de dados: 42
Autores: EBADA,MOHAMED E.
ABSTRACT Essential oils of green cumin (Cuminum cyminum) and chamomile (Chamomilla recutita) have antioxidant and anti-inflammatory effects. Acetaminophen, N-acetyl-p-amino-phenol, is an over-the-counter analgesic and antipyretic. Despite being safe at therapeutic doses, acetaminophen overdose is a leading cause of acute liver failure. This study aimed to compare the possible protective effects of cumin and chamomile essential oils against acute acetaminophen hepatotoxicity in male rats. Cumin oil (400 mg/kg) and chamomile oil (250 mg/kg) were orally administered for 2 weeks prior to a single acetaminophen dose (1g/kg). Serum liver function enzymes, oxidative stress markers in the liver and histopathological features were evaluated. Acetaminophen caused...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetaminophen; Acute hepatotoxicity; Chamomile; Cuminum cyminum; Histopathology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502347

The Araçatuba paleoswamp and the Bauru Basin initial sedimentation
Provedor de dados: 42
Autores: FERNANDES,LUIZ A.; GIANNINI,PAULO C. F.; GÓES,ANA M.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300019

Antifungal and antioxidant activity of fatty acid methyl esters from vegetable oils
Provedor de dados: 42
Autores: PINTO,MARIA E.A.; ARAÚJO,STHÉFANE G.; MORAIS,MARCELA I.; SÁ,NÍVEA P.; LIMA,CAROLINE M.; ROSA,CARLOS A.; SIQUEIRA,EZEQUIAS P.; JOHANN,SUSANA; LIMA,LUCIANA A.R.S.
ABSTRACT Fatty acid methyl esters (FAMEs) were obtained from vegetable oils of soybean, corn and sunflower. The current study was focused on evaluating the antifungal activity of FAMEs mainly against Paracoccidioides spp., as well as testing the interaction of these compounds with commercial antifungal drugs and also their antioxidant potential. FAMEs presented small IC50 values (1.86-9.42 μg/mL). All three FAMEs tested showed antifungal activity against isolates of Paracoccidioides spp. with MIC values ranging from 15.6-500 µg/mL. Sunflower FAMEs exhibited antifungal activity that extended also to other genera, with an MIC of 15.6 μg/mL against Candida glabrata and C. krusei and 31.2 μg/mL against C. parapsilosis. FAMEs exhibited a synergetic effect with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antifungal; Antioxidant; Fatty acid methyl esters; Vegetable oils.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401671

Seroprevalence of Zika virus among blood donors before the epidemic in Barranquilla, Colombia, 2015-2016.
Provedor de dados: 42
Autores: BAYONA-PACHECO,BRAYAN; ACOSTA-REYES,JORGE; NAVARRO,EDGAR; SAN-JUAN,HOMERO; BULA,JOHAN; BAQUERO,HERNANDO.
Abstract: The first cases of Zika virus infection in Colombia were reported and confirmed in October 2015. The objective of the study was estimate the seroprevalence of ZIKV infection during the pre-epidemic phase in Barranquilla, Colombia, and demonstrate the presence of virus before the Colombian Ministry of Health confirmed the first case. We conducted a descriptive study of the seroprevalence of Zika virus in 390 samples obtained from a blood bank located in Barranquilla, Colombia - a city endemic for dengue, and with a recent history of a Chikungunya disease epidemic. The serum pools were tested using Euroimmun ZIKV ELISA kit. Seroprevalence of Zika virus IgG were: May 2015: 0%, June and July 2015: 2.62% (95% CI = 0.28-12.13) and August 2015: 5.35%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zika virus; Seroprevalence; Pre-epidemic dates; Pregnant women.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500618

Biotransformation of grape pomace from Vitis labrusca by Peniophora albobadia LPSC # 285 (Basidiomycota)
Provedor de dados: 42
Autores: TRONCOZO,MARÍA I.; FIGOLI,CECILIA B.; FRANCO,MARIO E.E.; MIRÍFICO,MARÍA V.; BOSCH,ALEJANDRA; RAJCHENBERG,MARIO; BALATTI,PEDRO A.; SAPARRAT,MARIO C. N.
Abstract  Grape pomace from Vitis labrusca is an important sub-product of the “American table wine” industry. It is recalcitrant to degradation, and its accumulation is a serious problem with negative environmental impacts. We analyzed the ability of five white-rot fungi to transform this residue in-vitro. Mass loss and phenol removal in grape pomace treated with each fungus were compared after 30-day solid-state fermentation. Since Peniophora albobadia isolate LPSC 285 was the fungus that showed the highest degradative ability and the lowest free phenol levels in the residue transformed, we selected this fungus to monitor its effect on this residue after 30, 60, and 90 days of incubation. We analyzed mass loss of the residue caused by the fungus activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungi; Grape pomace; Peniophora albobadia; Transformation; Vitis labrusca.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100704

Complex communication signals: the case of the Blue-black Grassquit Volatinia jacarina (Aves, Emberizidae) song. Part I - A structural analysis
Provedor de dados: 42
Autores: Fandiño-Mariño,Hernán; Vielliard,Jacques M.E.
The song of the Blue-black Grassquit Volatinia jacarina is different for every individual and the structural differences between individuals are quite complex. Samples of songs from different Brazilian localities, as well as from Venezuela and Mexico, were studied through a comparative analysis of their sonograms. From the structural point of view, the results show a song composed of a single note that is compacted in a ''window'' between 2 and 13 kHz and rarely occupying more than half of a second. The note is essentially pure and is repeatedly uttered with a high level of fidelity. A global frequency modulation decreases from the beginning to the end of the song. The main song components are referred to as ''Blocks'' and are of three types:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Volatinia jacarina; Blue-black Grassquit; Song structure; Individual song.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200021

Scale insects (Hemiptera: Coccoidea) associated with arabica coffee and geographical distribution in the neotropical region
Provedor de dados: 42
Autores: FORNAZIER,MAURÍCIO J.; MARTINS,DAVID S.; WILLINK,MARIA CRISTINA G. DE; PIROVANI,VICTOR D.; FERREIRA,PAULO S.F.; ZANUNCIO,JOSÉ C.
ABSTRACT Coffee is one of the most important Brazilian agricultural commodities exported, and Minas Gerais and Espírito Santo States are the main coffee producers. Scale insects are important coffee pests, and 73 species of Cerococcidae (3), Coccidae (18), Diaspididae (6), Eriococcidae (1), Ortheziidae (3), Pseudococcidae (21), Putoidae (2) and Rhizoecidae (19) have been associated with roots, branches, leaves, flowers and fruits of Arabica coffee in the Neotropics. Eight species were found associated with Arabica coffee in Minas Gerais and Espírito Santo States in this study, and Coccidae was the most frequent family. Coccus alpinus, Cc. celatus, Cc. lizeri, Cc. viridis, and Saissetia coffeae (Coccidae) were found in both states; Alecanochiton marquesi,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccidae; Coffea arabica; Diaspididae; Geographical distribution; Pseudococcidae.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603083

Effect of drying method on mechanical, thermal and water absorption properties of enzymatically crosslinked gelatin hydrogels
Provedor de dados: 42
Autores: SIMONI,RAYSSA C.; LEMES,GISLAINE F.; FIALHO,SANDRA; GONÇALVES,ODINEI H.; GOZZO,ANGELA M.; CHIARADIA,VIVIANE; SAYER,CLAUDIA; SHIRAI,MARIANNE A.; LEIMANN,FERNANDA V.
ABSTRACT Enzymatically crossliked gelatin hydrogel was submitted to two different drying methods: air drying and freeze drying. The resulting polymeric tridimensional arrangement (compact or porous, respectively) led to different thermal and swelling properties. Significant differences (p &lt; 0.05) on thermal and mechanical characteristics as well as swelling in non-enzymatic gastric and intestinal simulated fluids (37 ºC) were detected. Water absorption data in such media was modelled according to Higuchi, Korsmeyer-Peppas, and Peppas-Sahlin equations. Freeze dried hydrogel showed Fickian diffusion behavior while air dried hydrogels presented poor adjustment to Higuchi model suggesting the importance of the relaxation mechanism at the beginning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air drying; Freeze drying; Hydrogel; Transglutaminase.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200745

A mean-field Babcock-Leighton solar dynamo model with long-term variability
Provedor de dados: 42
Autores: SANCHEZ,SABRINA; FOURNIER,ALEXANDRE; PINHEIRO,KATIA J.; AUBERT,JULIEN.
Dynamo models relying on the Babcock-Leighton mechanism are successful in reproducing most of the solar magnetic field dynamical characteristics. However, considering that such models operate only above a lower magnetic field threshold, they do not provide an appropriate magnetic field regeneration process characterizing a self-sustainable dynamo. In this work we consider the existence of an additional α-effect to the Babcock-Leighton scenario in a mean-field axisymmetric kinematic numerical model. Both poloidal field regeneration mechanisms are treated with two different strength-limiting factors. Apart from the solar antisymmetric parity behavior, the main solar features are reproduced: cyclic polarity reversals, mid-latitudinal equatorward migration of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solar dynamo; Solar cycle; Sunspots; Magnetohydrodynamics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100011

Water extracts of Brazilian leguminous seeds as rich sources of larvicidal compounds against Aedes aegypti L.
Provedor de dados: 42
Autores: Farias,Davi F.; Cavalheiro,Mariana G.; Viana,Martônio P.; Queiroz,Vanessa A.; Rocha-Bezerra,Lady C.B.; Vasconcelos,Ilka M.; Morais,Selene M.; Carvalho,Ana F.U.
This study assessed the toxicity of seed water extracts of 15 leguminous species upon Aedes aegypti larvae. A partial chemical and biochemical characterization of water extracts, as well as the assessment of their acute toxicity in mice, were performed. The extracts of Amburana cearensis, Anadenanthera macrocarpa, Dioclea megacarpa, Enterolobium contortisiliquum and Piptadenia moniliformis caused 100% of mortalit y after 1 to 3 h of exposure. They showed LC50 and LC90 values ranging from 0.43 ± 0.01 to 9.06 ± 0.12 mg/mL and from 0.71 ± 0.02 to 13.03 ± 0.15 mg/mL, respectively. Among the secondary metabolite constituents, the seed water extracts showed tannins, phenols, flavones, favonols, xanthones, saponins and alkaloids. The extracts also showed high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Larvicidal compounds; Leguminous seeds; Water extracts.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300006

The aeolian calcarenites of the Fernando de Noronha Island, Northeastern Brazil - a new approach
Provedor de dados: 42
Autores: MENOR,ELDEMAR A.; VALENÇA,LUCIA M. M.; NEUMANN,VIRGINIO H.; BOUJO,ARMAND.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300037

Environmental pathways and human exposure to manganese in southern Brazil
Provedor de dados: 42
Autores: HERMES,NADIR; SCHNEIDER,ROSANA C.S.; MOLIN,DANIELA D.; RIEGEL,GUILHERME Z.; COSTA,ADILSON B.; CORBELLINI,VALERIANO A.; TORRES,JOÃO P.M.; MALM,OLAF.
The study of environmental pathways and human exposure to Manganese (Mn) in Southern Brazil was performed using two steps. The first step consisted of taking water samples from the surface of the Pardinho River. The average results from this technique showed a significant increase of pollutants, including increased levels of Mn, above the environmentally acceptable standard recommended by the Brazilian National Environment Council. Additionally, 64 soil samples were taken from areas with and without agricultural activity. Many results were above the mean crust and did not indicate significant differences of Mn levels between the sampled areas. For the second step, 12 families were selected and assessed for exposure to Mn in a region with high levels of Mn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manganese; Human exposure; Environmental levels; Mn.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401275

Richness, composition and trophic groups of an avian community in the Pernambuco Endemism Centre, Alagoas, Brazil
Provedor de dados: 42
Autores: TOLEDO-LIMA,GUILHERME S.; MACARIO,PHOEVE; LYRA-NEVES,RACHEL M. DE; TEIXEIRA,BRUNO P.; LIMA,LUIZ A.F. DE; SUGLIANO,GABRIEL O.S.; TELINO-JÚNIOR,WALLACE R.
In northeastern Brazil, the reduction of the natural forest cover to a series of small, isolated fragments has had negative consequences for the local avian fauna, in particular, a loss of the more specialized species, while the populations of some generalists have tended to increase. The present study focuses on the composition and trophic groups of a bird community on a farm in the northeastern Brazilian state of Alagoas. Monthly surveys were conducted between November 2008 and October 2009, based on mist-netting and systematic observations. Overall, 112 species were recorded, of which 76 were associated with the two forest fragments surveyed, while all the others were observed exclusively in the surrounding matrix of pasture and orchards. The bird...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Birds; Northeastern Brazil; Trophic groups.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301207

Estimating Stand Height and Tree Density in Pinus taeda plantations using in-situ data, airborne LiDAR and k-Nearest Neighbor Imputation
Provedor de dados: 42
Autores: SILVA,CARLOS ALBERTO; KLAUBERG,CARINE; HUDAK,ANDREW T.; VIERLING,LEE A.; LIESENBERG,VERALDO; BERNETT,LUIZ G.; SCHERAIBER,CLEWERSON F.; SCHOENINGER,EMERSON R.
ABSTRACT Accurate forest inventory is of great economic importance to optimize the entire supply chain management in pulp and paper companies. The aim of this study was to estimate stand dominate and mean heights (HD and HM) and tree density (TD) of Pinus taeda plantations located in South Brazil using in-situ measurements, airborne Light Detection and Ranging (LiDAR) data and the non- k-nearest neighbor (k-NN) imputation. Forest inventory attributes and LiDAR derived metrics were calculated at 53 regular sample plots and we used imputation models to retrieve the forest attributes at plot and landscape-levels. The best LiDAR-derived metrics to predict HD, HM and TD were H99TH, HSD, SKE and HMIN. The Imputation model using the selected metrics was more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest inventory; LiDAR metrics; K-NN Imputation; Remote Sensing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100295

In vitro anti-inflammatory effects of naturally-occurring compounds from two Lauraceae plants
Provedor de dados: 42
Autores: Coy-Barrera,Ericsson D.; Cuca-Suarez,Luis E.
The in vitro anti-inflammatory effects of seven known lignans and one dihydrochalcone isolated from the leaves of two Lauraceae species (Pleurothyrium cinereum and Ocotea macrophylla), were evaluated through the inhibition of COX-1, COX-2, 5-LOX and the aggregation of rabbit platelets induced by PAF, AA and ADP. (+)-de-4"-O--methylmagnolin 4 was found to be a potent COX-2/5-LOX dual inhibitor and PAF-antagonist (COX-2 IC50 2.27 µM; 5-LOX IC50 5.05 µM; PAF IC50 2.51 µM). However, all compounds exhibited an activity at different levels, indicating good anti-inflammatory properties to be considered in further structural optimization studies.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: COX; Furofuran lignans; 5-LOX; Ocotea macrophylla; Platelet aggregation; Pleurothyrium cinereum.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400026

Metabolic responses to dietary carbohydrate/lipids ratios in neotropical hybrid catfish (♂Pseudoplatystoma corruscans×♀Pseudoplatystoma fasciatum)
Provedor de dados: 42
Autores: OKAMURA,DANIEL; FORTES-SILVA,RODRIGO; PAULINO,RENAN R.; ARAÚJO,FELIPE G. DE; COSTA,DIEGO V. DA; PEREIRA,RAQUEL T.; ROSA,PRISCILA V.
Abstract:  The purpose of this study was to assess the effect of different carbohydrate and lipid (CHO/L) ratios on the performance and energy metabolism of hybrid catfish (♂Pseudoplatystoma corruscans × ♀ Pseudoplatystoma fasciatum). One hundred and sixty-eight fish (104.9±16.5 g BW) were distributed into 24 100-L tanks. The experiment was performed using a randomised block design with four CHO/L ratios (0.45, 1.00, 1.66 and 2.85) and six replications. Growth performance, protein content, glucose and triglycerides in plasma, muscle and liver, and the hepatic activity of the malic and glucose-6-phosphate dehydrogenase (G6PD) enzymes were measured after 60 feeding days. No significant differences were observed in growth performance, protein and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzymes activity; Hepatic function; Intermediary metabolism; Hybrid catfish; Surubim.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700862

Erratum to "Genome engineering via homologous recombination in mouse embryonic stem (ES) cells: an amazingly versatile tool for the study of mammalian biology" [An Acad Bras Cienc 73(2001): 365-383]
Provedor de dados: 42
Autores: BABINET,CHARLES; COHEN-TANNOUDJI,MICHEL.
Tipo: Info:eu-repo/semantics/report
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400011

Ion-specific thermodynamical properties of aqueous proteins
Provedor de dados: 42
Autores: Lima,Eduardo R.A.; Biscaia Jr.,Evaristo C.; Boström,Mathias; Tavares,Frederico W.
Ion-specific interactions between two colloidal particles are calculated using a modified Poisson-Boltzmann (PB)equationandMonteCarlo(MC)simulations. PBequationspresentgoodresultsofionicconcentration profiles around a macroion, especially for salt solutions containing monovalent ions. These equations include not only electrostatic interactions, but also dispersion potentials originated from polarizabilities of ions and proteins. This enables us to predict ion-specific properties of colloidal systems. We compared results obtained from the modified PB equation with those from MC simulations and integral equations. Phase diagrams and osmotic second virial coefficients are also presented for different salt solutions at different pH and ionic strengths, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloid stability; Hofmeister series; Potential of mean force; Proteins.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100010

Copper II - polar amino acid complexes: toxicity to bacteria and larvae of Aedes aegypti
Provedor de dados: 42
Autores: RODRIGUES,THIAGO A.D.; ARRUDA,EDUARDO J. DE; FERNANDES,MAGDA F.; CARVALHO,CLAUDIO T. DE; LIMA,ALESSANDRA R.; CABRINI,ISAÍAS.
ABSTRACT Control strategies using insecticides are sometimes ineffective due to the resistance of the insect vectors.In this scenario new products must be proposed for the control of insect vectors.The complexes L-aspartate Cu (II) and L-glutamate-Cu (II) complexes were synthesized and characterized by elemental analysis, visible ultraviolet, infrared spectroscopy and potentiometric titration. The toxicity of these complexes was analyzed in Aedes aegypti (Diptera: Culicidae) larvae and Gram-negative and Gram-positive bacteria. The interaction between the ligands and the amino acid balance and the distribution of the species as a function of pH were discussed. The lethal concentration median (LC50) for Ae. aegypti larvae were: L-glutamic acid-Cu (II) -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neurotransmitter; Bacteria; Population control of vectors; Metal-insecticide; Mosquito.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502273

Conformational analysis of Pneumococcal Surface Antigen A (PsaA) upon zinc binding by fluorescence spectroscopy
Provedor de dados: 42
Autores: Bom,Ana Paula D. Ano; Corrêa,Izabella B.S.; Argondizzo,Ana Paula C.; Medeiros,Marco Alberto; Santos,Roger B. dos; Souza,Theo Luiz F. de; Silva Junior,José G. da.
ABSTRACT PsaA (pneumococcal surface antigen A) is a S. pneumoniae virulence factor that belongs to the metal transport system. The Manganese PsaA binding has been associated with oxidative stress resistance becoming a pivotal element in the bacteria virulence. It has been shown that Zinc inhibits the Manganese acquisition and promotes bacteria toxicity. We have performed a PsaA conformational analysis both in the presence (Zn-rPsaA) and in the absence of Zinc (free-rPsaA). We performed experiments in the presence of different Zinc concentrations to determine the metal minimum concentration which induced a conformational change. The protein in free and Zn-binding condition was also studied in pH ranging 2.6-8.0 and in temperature ranging 25oC-85oC. pH...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conformational analysis; RPsaA; Zinc; Stability; Streptococcus Pneumoniae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502299

Caspase-3 activation and increased procollagen type I in irradiated hearts
Provedor de dados: 42
Autores: Ferreira-Machado,Samara C.; Salata,Camila; Rocha,Nazareth N.; Corrêa,Alexandre F.S.; Côrte-Real,Suzana; Peregrino,Antônio A.F.; Campos,Vera M.A. de; Andrade,Cherley B.V.; Bernardo-Filho,Mario; Cabral-Neto,Januário B.; Dealmeida,Carlos E.
The caspase-3-cleaved presence was evaluated in this study in the heart of irradiated rats, during the decline of ventricular function. Female Wistar rats were irradiated with a single dose of radiation (15 Gy) delivered directly to the heart and the molecular, histological and physiological evaluations were performed at thirteen months post-irradiation. The expressions of procollagen type I, TGF-ß1 and caspase-3-cleaved were analyzed using Western blotting. Cardiac structural and functional alterations were investigated by echocardiography and electron microscopy. In the irradiated group, the levels of procollagen type I, TGF-ß1 and caspase-3-cleaved are increased. Significant histological changes (degeneration of heart tissue and collagen deposition) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apoptosis; Caspase-3; Fibrosis; Heart; Ionizing radiation; TGF-β1.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100215

Brachyuran and anomuran crabs associated with Schizoporella unicornis (Ectoprocta, Cheilostomata) from southeastern Brazil
Provedor de dados: 42
Autores: ALVES,DOUGLAS F.R.; BARROS-ALVES,SAMARA P.; LIMA,DANIEL J.M.; COBO,VALTER J.; NEGREIROS-FRANSOZO,MARIA LUCIA.
The main goals of this investigation were to describe the community structure of anomuran and brachyuran crabs inhabiting reefs constituted by colonies of Schizoporella unicornis, and to provide a species importance ranking for this community. Collections were carried out on S. unicornis reefs at two-month intervals from May 2003 to May 2004, in the rocky sublittoral of the southeastern Brazilian coast. Relative abundance and occurrence were used to rank these species in the hierarchy importance. A total of 2,018 individuals were obtained, in 11 families, 22 genera and 31 species. Porcellanidae and Pilumnidae were the most abundant families, comprising respectively almost 60% and 15% of individuals sampled. The species ranking indicated four main groups A,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogenic substrata; Bryozoan; Community structure; Decapods; Symbiotic species.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100245

The Late Holocene upper montane cloud forest and high altitude grassland mosaic in the Serra da Igreja, Southern Brazil
Provedor de dados: 42
Autores: SCHEER,MAURICIO B.; CURCIO,GUSTAVO R.; RODERJAN,CARLOS V.
Many soils of the highlands of Serra do Mar, as in other mountain ranges, have thick histic horizons that preserve high amounts of carbon. However, the age and constitution of the organic matter of these soils remain doubtful, with possible late Pleistocene or Holocene ages. This study was conducted in three profiles (two in grassland and one in forest) in Serra da Igreja highlands in the state of Paraná. We performed δ13C isotope analysis of organic matter in soil horizons to detect whether C3 or C4 plants dominated the past communities and 14C dating of the humin fraction to obtain the age of the studied horizons. C3 plants seem to have dominated the mountain ridges of Serra da Igreja since at least 3,000 years BP. Even though the Serra da Igreja may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Rain Forest; Carbon isotopes; Humin fraction; Radiocarbon dating; Sea Mountain Range; Upper montane vegetation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200769

Spatial changes in the water quality of Itajaí-Açú Fluvial-Estuarine System, Santa Catarina, Brazil
Provedor de dados: 42
Autores: Pereira-Filho,Jurandir; Rörig,Leonardo R.; Schettini,Carlos A.F.; Soppa,Mariana A.; Santana,Bruno L.; Santos,José Eduardo dos.
This study was carried out with the aim of evaluating the spatial variation of the water quality in the Itajaí-Açú River estuary. Seven stations along the estuary were monitored on a weekly basis, from October 2003 to December 2004, plus two stations in tributaries (Itajaí-Mirim River, the main tributary, and one reference station). This monitoring included measurements of salinity, pH, dissolved oxygen, temperature, nutrients(NH+4,NO3-2,NO-3,PO3-4,H4SiO4) Biochemical Oxygen Demand (BOD), total phosphorous and dissolved organic phosphorus (TP and DOP), particulate organic carbon (POC), suspended particulate matter (SPM) and chlorophyll-a (Cla). Multivariate analyses demonstrated the compartmentalization of the system based on the deterioration in water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itajaí Estuary; Nutrients; Organic matter; River; Santa Catarina.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400019

Leachate and vinasse used in a biological process combined with Fenton’s reaction: a green method for treatment of textile effluents
Provedor de dados: 42
Autores: BATTISTI,ANDRE C.; SANTOS,HYALLE M.M.F. DOS; ALBERTON,JÉSSICA S.; GOMES,LETÍCIA M.F.; RAUPP,LUCAS K.; GRACIANO,MARIANE R.; OLIVEIRA,PÂMELA E. DE; SILVA JUNIOR,JULIO L. DA; DIAS,RAFAEL CARLOS E.
Abstract: The production of textiles generates a large amount of liquid residues considered to be environmentally problematic and which, if discarded without due treatment, may cause eutrophication of water sources, the intoxication of living beings, and the blocking of light penetration. Some methods have been applied for the treatment of this type of waste, with the prominence of biological and physicochemical techniques. The combination of two or more techniques enhances the treatment’s efficiency. This work investigated the use of bacteria derived from the leachate produced by the textile industry itself, fed with vinasse, a by-product of the alcohol industry, with subsequent application of Fenton’s reaction. The biological method, optimized in terms...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Color removal; Environmental science; Organic load reduction; Sugarcane by-product; Textile industry waste.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700502

Effects of irrigation intervals and organic manure on morphological traits, essential oil content and yield of oregano ( Origanum vulgare L.)
Provedor de dados: 42
Autores: GERAMI,FARZAD; MOGHADDAM,PARVIZ R.; GHORBANI,REZA; HASSANI,ABBAS.
ABSTRACT In order to evaluate the effect of irrigation intervals and cattle manure levels on morphological traits, essential oil content and yield of oregano, an experiment was conducted at the experimental Farm of the Faculty of Agriculture, Urmia University, Iran. The experimental design was split-plots, arranged in randomized complete blocks with three replications. Main plots including irrigation intervals (1, 2 and 3 weeks) and four levels of cattle manure at 0, 10, 20 and 30 t ha-1 were allocated to sub plots. Our results showed that increasing irrigation intervals reduced values of all morphological traits except for proportion of stems. Also, values for stems number, plant spread, stem diameter, leaf area, fresh and dry herb yield increased by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle manure; Essential oil; Irrigation; Origanum vulgare L.; Yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602375

Phytogeographic patterns of the Atlantic Forest in the Rio Doce River Basin, the dart versus arrow debate, and quorum sensing in bacteria
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501903

Trophic dynamics (Dissolved Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates
Provedor de dados: 42
Autores: NORIEGA,CARLOS; ARAUJO,MOACYR; FLORES-MONTES,MANUEL; ARAUJO,JULIA.
Abstract: This paper focused on the use of the biogeochemical LOICZ (Land Ocean Interactions in the Coastal Zone) to investigate the dynamics of DIN and DIP nutrients among three highly urbanized tropical estuaries (Barra das Jangadas (BJ), Recife (RE) and Timbó (TB)), located in the northeastern region of Brazil. The input data were obtained through in situ measurements (2007) and governmental agency databases (2001-2007). The balances of the non-conservative elements showed that the RE and TB systems alternated between sources and sinks during the observation periods (0.2-0.8 mmoles DIP m-2 d-1 and 0.1-10 mmoles DIN m-2 d-1). The metabolism rates in the systems indicated that the BJ system was autotrophic during the two observation periods (10-26 mmoles...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients dynamics; Estuarine; Eutrophication; Modelling; Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300502

Storage and in vitro germination of orchids (Orchidaceae) seeds from Atlantic Forest – Brazil
Provedor de dados: 42
Autores: Franceschi,CRISTINA R.B.; SMIDT,ERIC C.; VIEIRA,LEILA N.; RIBAS,LUCIANA L.F.
Abstract: The orchid seed banks of Atlantic Forest may be considered a key strategy for the conservation of species threatened with extinction by indiscriminate collection or habitat destruction. The aim of this study was to evaluate the seed viability, to choose the best culture medium for the asymbiotic germination and evaluate germination, after storage for different periods and temperatures for the Brazilian native orchids: Gomesa praetexta (Rchb.f.) M.W.Chase &amp; N.H.Williams, Gomesa forbesii (Hook.) M.W.Chase &amp; N.H.Williams, Gomesa recurva R.Br. and Grandiphyllum divaricatum (Lindl.) Docha Neto. Knudson C (KC), Murashige &amp; Skoog (MS), half-strength MS (1/2 MS macro- and micro-nutrients) and Woody Plant Medium (WPM) culture media were tested...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Endangered species; Epidendroideae; Gomesa; Grandiphyllum.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500863

Biological characteristics of Heliothis virescens fed with Bt-soybean MON 87701 × MON 89788 and its conventional isoline
Provedor de dados: 42
Autores: BORTOLOTTO,ORCIAL C.; BUENO,ADENEY F.; BRAGA,KARLA; BARBOSA,GUSTAVO C.; SANZOVO,ALISSON.
This study aimed to evaluate the larval biology of Heliothis virescens in soybean MON 87701 x MON 89788 and its isogenic non-Bt. In general, the impact of soybean MON 87701 x MON 89788 on H. virescens was evidenced in all bioassays, 100% larval mortality, independent of the structure (leaf or pod) consumed by the pest. The small larvae (1st and 3rdinstar) demonstrated that they were unable to damage fresh pods of soybean, regardless of whether Bt or not Bt. The large larvae (5th instar) fed on soybean MON 87701 x MON 89788 soybeans consumed three times less compared to larvae fed on non-Bt soybeans, and resulted in reduced longevity and larval survival. When soybean plants were infested with 5th instar larvae, H. virescens caused injuries in the steams of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Varietal resistance; Tobacco budworm; Soybean pests; Lepidoptera pests; Heliothinae.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200973

Modulation of Diabetes and Dyslipidemia in Diabetic Insulin-Resistant Rats by Mangiferin: Role of Adiponectin and TNF-α
Provedor de dados: 42
Autores: SALEH,SAMIRA; EL-MARAGHY,NABILA; REDA,ENJI; BARAKAT,WALEED.
Mangiferin, present in Mangifera indica bark, was reported to produce hypoglycemic and antidiabetic activity in an animal model of genetic type 2 diabetes and in streptozotocin diabetic rats. Its effect on diabetic insulin-resistant animals has not been investigated. The current work aimed to explore the effect of mangiferin on diabetic insulin-resistant rat model. Diabetes was induced by high-fat/high fructose diet for eight weeks followed by a subdiabetogenic dose of streptozotocin (HFD-Fr-STZ). Rats were treated with mangiferin (20 mg/kg i.p.) for 28 days starting one week after STZ and its effects were compared to the standard insulin sensitizer, rosiglitazone. HFD-Fr-STZ, induced obesity, hyperglycemia and insulin resistance accompanied by depletion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangiferin; Diabetes; Dyslipidemia; Adipokines; Insulin resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401935

Analysis of results of biomass forest inventory in northeastern Amazon for development of REDD+ carbon project
Provedor de dados: 42
Autores: MELLO,LEONEL N.C.; SALES,MARCIO H.R.; ROSA,LUIZ P.
ABSTRACT In Brazil, a significant reduction in deforestation rates occurred during the last decade. In spite of that fact, the average annual rates are still too high, approximately 400.000 ha/year (INPE/Prodes). The projects of emissions reduction through avoided deforestation (REED+) are an important tool to reduce deforestation rates in Brazil. Understanding the amazon forest structure, in terms of biomass stock is key to design avoided deforestation strategies. In this work, we analyze data results from aboveground biomass of 1,019.346,27 hectares in the state of Pará. It was collected data from 16,722 trees in 83 random independent plots. It was tested 4 allometric equations, for DBH &gt; 10cm: Brown et al. (1989), Brown and Lugo (1999), Chambers et...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deforestation in Amazon; REDD+ Projects; Climate change; Carbon forest.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100055

Ontogenic development of kidney, thymus and spleen and phenotypic expression of CD3 and CD4 receptors on the lymphocytes of cobia (Rachycentroncanadum )
Provedor de dados: 42
Autores: KLOSTERHOFF,MARTA C.; PEREIRA JÚNIOR,JOABER; RODRIGUES,RICARDO V.; GUSMÃO,EMELINE P.; SAMPAIO,LUÍS A.; TESSER,MARCELO B.; ROMANO,LUIS A.
ABSTRACT In the present study was evaluated the ontogenic of immunocompetent organs of cobia up to 53 days after hatching (dah) through histology and immunohistochemistry techniques. The kidney was the first lymphohematopoietic organ to appear, at 1 dah, followed by the spleen at 5 dah and the thymus at 7 dah. The first CD3 receptors on the lymphocytes were observed in 27% of the thymic tissue at 7 dah and in 99% at 53 dah. The phenotypic expression of CD3 receptors was registered in 10% of the kidney at 8 dah and in 32% at 53 dah. CD4 receptors were observed in 5% and 63% of the thymic area at 7 and 53 dah, respectively. In the kidney, T4 lymphocytes were first observed at 13 dah in 9% of the organ and in 28% at 53 dah, defining the functional development...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobia; Immune system; Ontogeny; Immunohistochemistry; Lymphoid organs.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502111

Carajathemis simone, new genus and species from Brazil (Odonata: Libellulidae)
Provedor de dados: 42
Autores: Machado,Angelo B.M.
Carajathemis simone n. gen., n.sp. from the state of Pará, Brazil, is described and illustrated based on 22 specimens collected in a "canga" (laterite) lake within the forest at the Flona de Carajás, Parauapebas Municipality. The new libellulid genus fits in the subfamily Sympetrinae and the male keys out to Erythemis in Garrison et al. (2006). The new taxon has a combination of characters that makes it different from all genera of Sympetrinae including Erythemis. The species is remarkable by its large size, pleural striping and especially by the complex and strongly dimorphic leg armature. It seems to be restricted to shallow, rainfall-dependent, iron-rich lakes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Morphology; Dragonflies; Legs.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400018

Aquifer systems characterization in Campos dos Goytacazes Municipality, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: CAETANO,LUCIO C.; PEREIRA,SUELI Y.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300021

The potential contribution of the natural products from Brazilian biodiversity to bioeconomy
Provedor de dados: 42
Autores: VALLI,MARILIA; RUSSO,HELENA M.; BOLZANI,VANDERLAN S.
ABSTRACT The development of our society has been based on the use of biodiversity, especially for medicines and nutrition. Brazil is the nation with the largest biodiversity in the world accounting for more than 15% of all living species. The devastation of biodiversity in Brazil is critical and may not only cause the loss of species and genes that encode enzymes involved in the complex metabolism of organisms, but also the loss of a rich chemical diversity, which is a potential source for bioeconomy based on natural products and new synthetic derivatives. Bioeconomy focus on the use of bio-based products, instead of fossil-based ones and could address some of the important challenges faced by society. Considering the chemical and biological diversity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian biodiversity; Natural products; Medicinal chemistry; Database.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200763

A new index for assessing the value of importance of species - VIS
Provedor de dados: 42
Autores: NETTO,SYLVIO PÉLLICO; AMARAL,MAURICIO K.; CORAIOLA,MARCIO.
ABSTRACT Phytosociological analysis in native forests is performed considering the horizontal and vertical structure of the studied population, whose most expressive parameters are the density, dominance, frequency, value of coverage and value of importance of species. Many phytosociological studies include a value of importance of species calculated by adding density, dominance and frequency, in their relative forms, however, this estimator is a mathematical impropriety because the result is a sum of indexes and does not express the true meaning of species' value. This is because the estimator is still influenced predominantly by the density of occurrence of species and cannot capture the relevant hierarchical participation of emerging species that occur...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light competition index; Phytosociological parameters; Tropical Mixed Forest; Native Forest.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502265

Daily practices, consumption and citizenship
Provedor de dados: 42
Autores: Mazzarino,Jane M.; Morigi,Valdir J.; Kaufmann,Cristine; Farias,Alessandra M.B.; Fernandes,Diefersom A.
This paper promotes a reflection on the relationship between daily practices and consumption. Understanding how conflicts, resistance and consensus are generated from daily consumption practices opens up possibilities for reflecting on the construction of sustainability in the context of diversity, one of the landmarks of the globalized world. Within this socio-cultural context, the central issue is: can consumption generate citizenship practices? The concepts of subject and agent help one think about collective action and subjectivation processes and their interferences on the collective consuming behavior. Based on empirical data from a research carried out in the municipality of Estrela in 2007, in the Taquari Valley - Rio Grande do Sul (Southern...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consuption; Daily life; Environental practices; Citizenship; Social representations.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400033

Regulation of glutamic acid decarboxylase of chick and rat retina cells by GABA and excitatory amino acids
Provedor de dados: 42
Autores: ALMEIDA,OLGA MARIA M.S. DE; SANTOS,NELSON L. DOS; HOKOÇ,JAN NORA; YAMASAKI,EDNA N.; GARDINO,PATRÍCIA F.; MELLO,FERNANDO G. DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300026

Reproductive phenology and sharing of floral resource among hummingbirds (Trochilidae) in inflorescences ofDahlstedtia pinnata (Benth.) Malme. (Fabaceae) in the Atlantic forest
Provedor de dados: 42
Autores: MISSAGIA,CAIO C.C.; VERÇOZA,FÁBIO C.; ALVES,MARIA ALICE S.
The purpose of this study was to investigate the reproductive phenology and sharing of floral resource (nectar) ofDahlstedtia pinnata (Benth.) Malme. (Fabaceae), endemic of Atlantic forest, among hummingbirds. For the phenology, we looked at the presence of reproductive structures in the plants, and for floral resource sharing, the frequency of potential pollinators and foraging behaviors were examined. This study was conducted in Pedra Branca State Park, in state of Rio de Janeiro, in a dense ombrophilous forest, between August 2010 and August 2011. Flowering occurred between December 2010 and March 2011, and fruiting between April and June 2011. Hummingbirds' foraging schedules differed significantly, with legitimate visits to the flowers occurring in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floral theft; Foraging behavior; Ornithophily; Pollination.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401693

Bioprospecting of lipolytic microorganisms obtained from industrial effluents
Provedor de dados: 42
Autores: PEIL,GREICE H.S.; KUSS,ANELISE V.; RAVE,ANDRÉS F.G.; VILLARREAL,JOSÉ P.V.; HERNANDES,YOHANA M.L.; NASCENTE,PATRÍCIA S.
ABSTRACT The lipases have ability to catalyze diverse reactions and are important in different biotechnological applications. The aim of this work was to isolate and characterize microorganisms that produce lipases, from different food industry effluents localized in Pelotas, RS/Brazil. Bacteria were identified using Gram stain and biochemical tests (Vitek 2(r)). Fungi were identified according to macro and micromorphology characteristics. The extracellular lipase production was evaluated using the Rhodamine B test and the enzymatic activity by titration. Twenty-one bacteria were isolated and identified as Klebsiella pneumoniae ssp. pneumoniae, Serratia marcescens, Enterobacter aerogenes, Raoultella ornithinolytica and Raoultella planticola. Were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Effluent; Enzyme activity; Extracellular lipase production; Lipase enzyme; Lipolytic microorganism.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501769

Can the parasitic fauna on Nile tilapias be affected by different production systems?
Provedor de dados: 42
Autores: Martins,Maurício L.; Azevedo,Tatiana M.P.; Ghiraldelli,Luciana; Bernardi,Neuza.
This study compared the parasitic fauna on Nile tilapias kept with swine dejects and tilapia from fee fishing fed commercial ration. A total of 360 fish were analyzed from August 2003 to July 2004 in a facility situated in Nova Trento, Santa Catarina, Brazil. No significant difference was observed in both systems. The parasite fauna in both systems were slightly similar, with the presence of the following parasites: Trichodina magna and T compacta (Ciliophora); Cichlidogyrus sclerosus and Cichlidogyrus sp. (Monogenoidea); and Lamproglena sp. (Lernaeidae). Parasitological analyzes did not differ among fishes kept with swine dejects and in fee fishing with commercial diet (P &gt;0.05). The total prevalence of trichodinids in the gills of fish kept with swine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Fee fishing; Swine dejects; Monogenoidea; Trichodina; Prevalence.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200024

Delineating shallow Neogene deformation structures in northeastern Pará State using Ground Penetrating Radar
Provedor de dados: 42
Autores: Rossetti,Dilce F.
The geological characterization of shallow subsurface Neogene deposits in northeastern Pará State using Ground Penetrating Radar (GPR) revealed normal and reverse faults, as well as folds, not yet well documented by field studies. The faults are identified mostly by steeply-dipping reflections that sharply cut the nearby reflections causing bed offsets, drags and rollovers. The folds are recognized by reflections that are highly undulating, configuring broad concave and convex-up features that are up to 50 m wide and 80 to 90 ns deep. These deformation structures are mostly developed within deposits of Miocene age, though some of the faults might continue into younger deposits as well. Although the studied GPR sections show several diffractions caused by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neogene; Northeastern Pará State; Ground Penetrating Radar; Tectonics; Sedimentary rocks.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200009

A Dangerous Mistake: Research as a Commodity in University Institutions
Provedor de dados: 42
Autores: MESIA-MONTENEGRO,CHRISTIAN.
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703241

Photo-Fries rearrangements of 1-naphthyl (R)-2-phenylpropanoate in poly(vinyl acetate) and ethyl acetate: influence of medium polarity and polymer relaxation on motions of singlet radical pairs
Provedor de dados: 42
Autores: Xu,Jinqi; George,Mathew; Weiss,Richard G.
Both the regio- and stereo-chemistries of the photoreactions of 1-naphthyl (R)-2-phenylpropanoate have been investigated in poly(vinyl acetate) films in their glassy (at 5ºC) and melted (at 50ºC) states and in ethyl acetate. These results are compared with those from irradiations in polyethylene films and in n-hexane. The regioselectivity of the intermediate 1-naphthoxy/(R)-2-phenylpropanoyl radical pair combinations is much higher in both the melt and glassy states of poly(vinyl acetate) films than that in the melt state of completely amorphous polyethylene films, but the stereoselectivity of intermediate prochiral 1-naphthoxy/1-phenylethyl radical pair combinations is much lower in poly(vinyl acetate). The results emphasize the need to control the ratio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radical pair; Stereoselectivity; Polymer relaxation; Photo-Fries.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100005

Respiratory syncytial virus causes more hospitalizations and deaths in equatorial Brazil than influenza (including during the 2009 pandemic)
Provedor de dados: 42
Autores: ALONSO,WLADIMIR J.; TAMERIUS,JAMES; FREITAS,ANDRÉ R.R.
Abstract  Despite numerous studies evaluating influenza and Respiratory Syncytial Virus (RSV), there is still a lack of knowledge about them, especially in tropical countries. We compared the relative importance of respiratory viruses by examining their spatiotemporal patterns, age-specific hospitalization data and mortality data for 2007-2012 obtained from official sources. The data were aggregated into “respiratory infection seasonal zones” formed combining states that had similar seasonal patterns of pneumonia and influenza (P&amp;I). Equatorial-North where P&amp;I peaks in the middle of the year, Equatorial-South where P&amp;I peaks in the first semester and coincides with the rainy-season, Subtropical where P&amp;I peaks are clearly concentrated in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease burden; Influenza; RSV; Seasonality; Pandemic; 2009pdm.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100904

Chemical composition and antimicrobial activity of essential oils of Ocimum canum Sims. and Ocimum selloi Benth.
Provedor de dados: 42
Autores: Nascimento,Jeferson C.; Barbosa,Luiz C.A.; Paula,Vanderlucia F.; David,Jorge M.; Fontana,Renato; Silva,Luiz A.M.; França,Robson S.
This work describes the chemical composition and antimicrobial activity of the volatile oils of Ocimum canum and Ocimum selloi, both occurring in Jequié/BA, northeastern Brazil. The plants were collected in the winter/2005 andsummer/2006, the oils extracted by steam distillation and further analyzed by GC-MS. A total of 30 and 31 compounds was identified from the oils of O. selloi and O. canum, respectively. It was observed that the oil content of O. canum showed variation during the seasons, while the oils of O. selloi did not. Methylchavicol and linalool were the main chemical components found in the aerial parts and leaves of O. canum. This finding permitted to characterize this specimen as a new chemotype of O. canum. Regarding the aerial parts of O....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial activity; Essential oil; Lamiaceae; Ocimum canum; Ocimum selloi.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300004

Are leaf physiological traits related to leaf water isotopic enrichment in restinga woody species?
Provedor de dados: 42
Autores: ROSADO,BRUNO H.P.; MATTOS,EDUARDO A. DE; STERNBERG,LEONEL DA S.L.
During plant-transpiration, water molecules having the lighter stable isotopes of oxygen and hydrogen evaporate and diffuse at a faster rate through the stomata than molecules having the heavier isotopes, which cause isotopic enrichment of leaf water. Although previous models have assumed that leaf water is well-mixed and isotopically uniform, non-uniform stomatal closure, promoting different enrichments between cells, and different pools of water within leaves, due to morpho-physiological traits, might lead to inaccuracies in isotopic models predicting leaf water enrichment. We evaluate the role of leaf morpho-physiological traits on leaf water isotopic enrichment in woody species occurring in a coastal vegetation of Brazil known asrestinga. Hydrogen and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf water isotopic enrichment; Péclet effect; Restinga; Leaf morpho-physiological traits.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301035

Antibacterial activity of Lamiaceae plant extracts in clinical isolates of multidrug-resistant bacteria
Provedor de dados: 42
Autores: ASSIS,FELIPE V. DE; SIQUEIRA,FLÁVIA L.; GONÇALVES,ISABELA E.; LACERDA,RAFAEL P.; NASCIMENTO,RAFAELA A.; ARAÚJO,STHÉFANE G.; ANDRADE,JÉSSICA T.; HERRERA,KARINA M.S.; LIMA,LUCIANA A.R.S.; FERREIRA,JAQUELINE M.S.
ABSTRACT The antibacterial activity of plant extracts of the Lamiaceae family was evaluated against clinical isolates of multi-resistant Gram-negative bacteria by broth microdilution technique. Promising results were obtained considering that all extracts were active for at least two bacterial species with MIC ranging from 0.5 to 2.0 mg/mL.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial; Clinical isolates; Lamiaceae extracts; Multidrug-resistant.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401665

Objective measurement of Akodon budini dorsal coloration: methodological concerns
Provedor de dados: 42
Autores: SALINAS,MARÍA L. SANDOVAL; SANDOVAL,JOSÉ D.; COLOMBO,ELISA M.
ABSTRACT The role of color in taxonomic and systematic studies of several taxa is central. Color data are more valuable if they permit comparisons. We aimed to provide pelage objective color measurements of a series of Akodon budini and to use those color data to test and to quantitatively analyze the influence of both the lighting source and the measuring point, in the determination of pelage color of museum skins. We used a spectroradiometer to measure the pelage color at five points over the dorsal midline of 54 Akodon budini museum skins. PCAs and ANOVAs were conducted over the color data. The characteristics of the studied series also allowed us to include and assess the potential effects of some main sources of intra-specific variation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromatic coordinates; CIELab color space; Lighting source; Measuring points; Spectroradiometer.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200489

Evaluation of morpho-anatomical and chemical differences between varieties of the medicinal plant Casearia sylvestris Swartz
Provedor de dados: 42
Autores: CLAUDINO,JOSIANE C.; SACRAMENTO,LUIS V.S. DO; KOCH,INGRID; SANTOS,HELEN A.; CAVALHEIRO,ALBERTO J.; TININIS,ARISTEU G.; SANTOS,ANDRé G. DOS.
Casearia sylvestris Swartz (Salicaceae) has been used in traditional medicine and its leaf extracts have been exhibited important pharmacological activities. The species presents morphological, chemical and genetic variation. Two varieties are considered due external morphological differences: C. sylvestris var. sylvestris and var. lingua. There are difficulties in definition of these varieties. The objective of this work is to evaluate chemical and morpho-anatomical differences between C. sylvestris varieties that can be applied in their distinction for pharmaceutical or botanical purposes. Transverse and paradermic sections of leaves were prepared for morpho-anatomical, histochemical and quantitative microscopy (stomatal and palisade index) analyses....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Casearia sylvestris; Chromatography; Diterpenes; Morpho-anatomy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401253

Physiological responses of soybean (Glycine max (L.) Merrill) cultivars to copper excess
Provedor de dados: 42
Autores: SCHWALBERT,RAISSA; SILVA,LINCON O.S.; SCHWALBERT,RAI A.; TAROUCO,CAMILA P.; FERNANDES,GILLIAN S.; MARQUES,ANDERSON C.R.; COSTA,CAMILA C.; HAMMERSCHMITT,RODRIGO K.; BRUNETTO,GUSTAVO; NICOLOSO,FERNANDO T.
Abstract Abstract: Successive applications of copper fungicides on vines have resulted in increased copper content in vineyard soils over the years. This high copper content has affected the growth of young vines in eradicated vineyards. Thus, the cultivation of annual species for a few years is an alternative to copper phytostabilization, because it would be a good way to decrease copper availability to plants. The aim of this study was to evaluate the physiological responses of different soybean cultivars to copper concentration increase. Four different soybean cultivars were grown under three copper concentrations: 0.5, 20 and 40 μM in nutrient solution. The main outcomes of this study were: i) Cultivar M 6410 IPRO recorded the highest photosynthetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant system; Cash crops; Heavy metal phytostabilization; Photosynthesis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700618

The Paripueira evaporitic interval of Maceio Sub-Basin - Sergipe/Alagoas basin
Provedor de dados: 42
Autores: Florencio,Cláudio P.; Pueyo,Juan J.; Ribeiro Filho,Evaristo.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400014

Acidification of the parasitophorous vacuole containing Toxoplasma gondii in the presence of hydroxyurea
Provedor de dados: 42
Autores: Carvalho,Cristiane S.; Melo,Edésio J.T.
Toxoplasma gondii multiplies within parasitophorous vacuole that is not recognized by the primary no oxidative defense of host cells, mainly represented by the fusion with acidic organelles. Recent studies have already shown that hydroxyurea arrested the intracellular parasites leading to its destruction. In the present work we investigated the cellular mechanism involved in the destruction of intracellular Toxoplasma gondii. Fluorescent vital stains were used in order to observe possible acidification of parasitophorous vacuole-containing Toxoplasma gondii in presence of hydroxyurea. Vero cells infected with tachyzoites were treated with hydroxyurea for 12, 24 or 48 hours. Fluorescence, indicative of acidification, was observed in the parasitophorous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydroxyurea; Toxoplasma gondii; Parasitophorous vacuole.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300008

Consumption of Euterpe edulis fruit by wildlife: implications for conservation and management of the Southern Brazilian Atlantic Forest
Provedor de dados: 42
Autores: SILVA,JULIANO Z. DA; REIS,MAURÍCIO S. DOS.
Abstract: This study aimed to measure the wildlife consumption of Euterpe edulis fruit and use this data to discuss management possibilities. To estimate infructescence fruit volume consumed, collectors were installed in fruit-bearing palms. To characterize consumption from the ground, samples were placed next to fruiting palms. To identify wildlife and their activities, camera traps were installed in infructescences and on the ground. The results suggested that there was a small fruit surplus (1.8 %), and this finding indicated the possibility of a harvest to reduce food for the wildlife. However, recurrent variations in the annual fruit production (21.4 %) were also noted, and suggested that wildlife could tolerate some fruit harvesting. Thus, a harvest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural regeneration; Non-timber forest products; Rain forest; Seed dispersal; Seed predation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100628

Computer simulations for biological aging and sexual reproduction
Provedor de dados: 42
Autores: STAUFFER,DIETRICH; OLIVEIRA,PAULO M.C. DE; OLIVEIRA,SUZANA MOSS DE; PENNA,THADEU J.P.; MARTINS,JORGE S. SÁ.
The sexual version of the Penna model of biological aging, simulated since 1996, is compared here with alternative forms of reproduction as well as with models not involving aging. In particular we want to check how sexual forms of life could have evolved and won over earlier asexual forms hundreds of million years ago. This computer model is based on the mutation-accumulation theory of aging, using bits-strings to represent the genome. Its population dynamics is studied by Monte Carlo methods.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parthenogenesis; Genome; Menopause; Testosterone; Monte Carlo simulation.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100003

Cloning, expression, and analysis of the group 2 allergen from Dermatophagoides farinae from China
Provedor de dados: 42
Autores: Yu-bao,Cui; Zhou,Ying; Weihong,Shi; Guifang,Ma; Yang,Li; Yungang,Wang.
To obtain the recombinant group 2 allergen product of Dermatophagoides farinae (Der f 2), the Der f 2 gene was synthesized by RT-PCR. The full-length cDNA comprised 441 nucleotides and was 99.3% identical to the reference sequence (GenBank AB195580). The cDNA was bound to vector pET28a to construct plasmid pET28a(+)-Der f 2, which was transformed into E. coli BL21 and induced by IPTG. SDS-PAGE showed a specific band of about 14kDa in the hole cell lysate. s estiated by chroatography, about 3.86 g of the recobinant product as obtained, which conjugated with serum IgE from asthmatic children. The protein had a signal peptide of 17 amino acids. Its secondary structure comprised an alpha helix (19.86%), an extended strand (30.82%), and a random coil (49.32%)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dermatophagoides farinae; House-dust-mite allergy; Mite allergens; Der f 2; Allergen engineering; Immunotherapy; Bioinformatics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400017

Strategies Towards the Synthesis of N2-Substituted 1,2,3-Triazoles
Provedor de dados: 42
Autores: SOUZA,RODRIGO OCTÁVIO M.A. DE; MIRANDA,LEANDRO S. DE MARIZ E.
Abstract The chemistry of 1,2,3-triazoles gained much attention since the discovery of the copper catalyzed Alkyne-azide cycloaddition (CuAAC) reaction which delivers exclusively the 1,4-regioisomer in high yields. On the other hand there is still no universal methodology capable of delivering the N2 substituted regioisomer. The unique properties of these N2-substituted 1,2,3-triazoles have stimulated synthetic efforts on the developments of methodologies capable of delivering it in high yield and selectivity. These efforts are the subject of the presented review.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 1; 2; 3-Triazoles Heterocycles Regiosselectivity arylation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200401

Root distribution and its association with bean growth habit
Provedor de dados: 42
Autores: VELHO,LUIS P.S.; MELO,RITA C. DE; BERNARDY,JOÃO PEDRO F.; GRIGOLO,SIBILA; GUIDOLIN,ALTAMIR F.; COIMBRA,JEFFERSON L.M.
ABSTRACT Associations between root distribution and bean growth habit may contribute to the selection of genotypes adapted to restrictive environments. The present work aimed to relate and compare root distribution with the growth habit in beans. 10 bean genotypes of different growth habits (I, II and III) were evaluated for root distribution in two agricultural years (2014/15 and 2015/16). The genotypes responded similarly for the trait root distribution throughout the agricultural years, without any simple effect of the genotype x year interaction. The factors genotype and years were significant for the trait. The genotypes of a determinate habit showed significant differences compared to other genotypes (II and III), which were ascribed to their poor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stresses; Contrasts; Genotype x environment interaction; Phaseolus vulgaris L.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401837

First record of growth rings for 11 native subtropical anuran species of South America
Provedor de dados: 42
Autores: BRUM,AMANDA J.C.; LOEBENS,LUIZA; SANTOS,MAURÍCIO B. DOS; CECHIN,SONIA Z.
Abstract: Skeletochronology is the most accurate method to estimate a population age structure. The methodology is based on the analysis of secondary bone tissue in order to count growth rings. This study aimed to provide initial data, allowing researchers to further work out in the age of individuals and populations, sampling evidence of the presence of growth rings in 11 native species (representing nine families) of a subtropical region of southern Brazil. Four bone samples of each specimen were used to perform the skeletochronological analysis: the penultimate phalanges of the 3rd and 4th fingers, the humerus, and the femur. The presence of growth rings was confirmed in the periosteal layer of the bones of all analyzed species. In comparison with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone chronology; Frogs; Lines of arrested growth; Southern Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700619

Purification, characterization and structural determination of chitinases produced by Moniliophthora perniciosa
Provedor de dados: 42
Autores: Galante,Rafaela S.; Taranto,Alex G.; Koblitz,Maria G.B.; Góes-Neto,Aristóteles; Pirovani,Carlos P.; Cascardo,Júlio C.M.; Cruz,Sandra H.; Pereira,Gonçalo A.G.; Assis,Sandra A. de.
The enzyme chitinase from Moniliophthora perniciosa the causative agent of the witches' broom disease in Theobroma cacao, was partially purified with ammonium sulfate and filtration by Sephacryl S-200 using sodium phosphate as an extraction buffer. Response surface methodology (RSM) was used to determine the optimum pH and temperature conditions. Four different isoenzymes were obtained: ChitMp I, ChitMp II, ChitMp III and ChitMp IV. ChitMp I had an optimum temperature at 44-73ºC and an optimum pH at 7.0-8.4. ChitMp II had an optimum temperature at 45-73ºC and an optimum pH at 7.0-8.4. ChitMp III had an optimum temperature at 54-67ºC and an optimum pH at 7.3-8.8. ChitMp IV had an optimum temperature at 60ºC and an optimum pH at 7.0. For the computational...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chitinase; Moniliophthora perniciosa; Kinetic characterization; Purification; Isoenzymes; Heat stability; 3D structure; Comparative modeling.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200016

Multidrug resistance in tumour cells: characterisation of the multidrug resistant cell line K562-Lucena 1
Provedor de dados: 42
Autores: RUMJANEK,VIVIAN M.; TRINDADE,GILMA S.; WAGNER-SOUZA,KAREN; MELETTI-DE-OLIVEIRA,MICHELE C.; MARQUES-SANTOS,LUIS F.; MAIA,RAQUEL C.; CAPELLA,MÁRCIA A. M.
Multidrug resistance to chemotherapy is a major obstacle in the treatment of cancer patients. The best characterised mechanism responsible for multidrug resistance involves the expression of the MDR-1 gene product, P-glycoprotein. However, the resistance process is multifactorial. Studies of multidrug resistance mechanisms have relied on the analysis of cancer cell lines that have been selected and present cross-reactivity to a broad range of anticancer agents. This work characterises a multidrug resistant cell line, originally selected for resistance to the Vinca alkaloid vincristine and derived from the human erythroleukaemia cell K562. This cell line, named Lucena 1, overexpresses P-glycoprotein and have its resistance reversed by the chemosensitisers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multidrug resistance; Leukaemia; P-glycoprotein; Chemosensitisers.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100007

Facies and sequence stratigraphy of the Itararé and Guatá Subgroups (late Paleozoic), Northern Paraná Basin, Brazil
Provedor de dados: 42
Autores: CHAVES-JUNIOR,ANTONIO M.; CANUTO,JOSÉ R.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300020

Ethiopian muscids (Diptera, Muscidae) egg-carriers of Stylogaster Macquart (Diptera, Conopidae)
Provedor de dados: 42
Autores: COURI,MÁRCIA S.; JORDAENS,KURT; GEERAERT,LORE; MATHEUS,RAFAEL; VIEIRA-ARAÚJO,ANGELINA P.
Abstract: We here report for the first time on the presence of three species of the conopid genus Stylogaster Macquart (Diptera, Conopidae) in Ethiopia, viz. S. nitens Brunetti, S. westwoodi Smith and Stylogaster sp.. We further screened 908 muscid flies (Diptera, Muscidae) for the presence of impaled eggs of Stylogaster and recorded eggs on 89 individuals (9.8%). Eggs were impaled on eight species, viz. Limnophora translucida Stein, Musca lusoria Wiedemann, Musca splendens Pont, Neomyia chrysopyga (Emden), Pseudohelina nigritarsis (Jaennicke), Stomoxys omega Newstead, Stomoxys taeniatus Bigot and Stomoxys varipes (Bezzi). The maximum number of eggs found on a single muscid was six. We illustrated the dissected eggs. L. translucida, M. lusoria, M....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Afrotropical region; Dart-eggs; Ethiopia; New record.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500502

Soil Physical Quality in Agricultural Systems on the Cerrado of Piauí State, Brazil
Provedor de dados: 42
Autores: SCHOSSLER,THIAGO R.; MARCHÃO,ROBÉLIO L.; SANTOS,ISIS L. DOS; SANTOS,DJAVAN P.; NÓBREGA,JÚLIO CÉSAR A.; SANTOS,GLENIO G.
Abstract Soil quality is essential for maintaining the sustainability of agro-ecosystems and ecosystem services provided by this natural resource. The present study aimed to assess the physical quality of soil through the characterization of the physical properties in grain production systems in the Southwest region of Piauí State, Brazil. The study was carried out in the Cerrado region of Piauí in four cities in areas of expansion of the agricultural frontier of the state: Baixa Grande do Ribeiro, Sebastião Leal, Uruçuí and Bom Jesus. Soil samples were collected in April 2012, in areas of grain production under conventional and no-tillage systems. Adjacent areas with native vegetation were also sampled as reference. Bulk density, effective saturation,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sustainable intensification; No-tillage porosity aggregation Oxisols.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703975

Environmental risk increase due to heavy metal contamination caused by a copper mining activity in Southern Brazil
Provedor de dados: 42
Autores: BIDONE,EDISON D.; LAYBAUER,LUCIANO; CASTILHOS,ZULEICA C.; MADDOCK,JOHN L.
The Camaquã Copper Mines (CCM) were the main sulphide deposit in Southern Brazil and have been in operation from last century to 1996. To evaluate water contamination and environmental risk increase by heavy metals from mining operations, two points on the João Dias Creek were sampled (Station 1, background area and Station 2, contaminated area). Mining activity increased the natural weakly heavy metal fluxes by approximately 5424 kg. ( ~ 60%) of the total metal flux, 1542 kg. ( ~ 49%) of dissolved and 3881 kg ( ~ 66%) of particulate metal flux. Total metal flux of anthropic origin was mostly due to Fe followed by Cu &gt; Zn &gt; Mn whereas Cd, As and Pb fluxes were negligible. The potential human health hazards and risk assessment related to daily intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Environmental risk; Heavy metals; Copper mining.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200011

Endocrine cells and nerve ganglia of the small intestine of the Opossum Didelphis aurita Wied-Neuwied, 1826 (Mammalia: Didelphidae)
Provedor de dados: 42
Autores: Freitas-Ribeiro,Gláucia M.; Fonseca,Cláudio C.; Sartori,Sirlene S.R.; Loures-Ribeiro,Alan; Neves,Clóvis A.
The nervous and endocrine systems jointly control intestinal movements, secretions of their glands and also participate of the processes of nutrient digestion and absorption. Therefore, the central objective of this study was to verify the existence of a possible relationship between the number of nervous cells and ganglia of the submucosal and myenteric plexuses and the number of endocrine cells in the small intestine of adult D. aurita. The utilized staining techniques were Grimelius, modified Masson-Fontana, direct immunoperoxidase and H-E. Argyrophillic, argentaffin and insulin immunoreactive endocrine cells do not numerically vary between the initial, mid and final regions of the duodenum, jejunum and ileum (P&gt;0.05), except for argyrophillic cells...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argyrophillic cells; Argentaffin cells; Endocrine cells; Ganglia; Insulin.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300017

Physiological behavior of bean's seeds and grains during storage
Provedor de dados: 42
Autores: CASSOL,FLÁVIA D.R.; FORTES,ANDRÉA M.T.; MENDONÇA,LORENA C.; BUTURI,CAMILA V.; MARCON,THAÍS R.
Beans are one of the most used foods to meet the energy needs of the Brazilian diet, requiring farmers to use high seed physiological potential. The aim was to evaluate the physiological quality of beans stored for 360 days. Analyses were performed at 0, 30, 90, 180, 270, and 360 days after receiving the seeds (S1 and S2) and grains (G1 and G2) of BRS Splendor. Tests of germination, accelerated aging, cold, speed of germination, average length of shoots, and root were performed. The experimental design was completely randomized split-plot in time and the means were compared through Tukey test at 5% probability. Seed germination was not affected in S2, while the drop in S1 and G1 was significant. The vigor of grains from field 1 declined from 91 to 50% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Phaseolus vulgaris L.; Physiological quality; Vigor.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301069

A new Mammutidae (Proboscidea, Mammalia) from the Late Miocene of Gansu Province, China
Provedor de dados: 42
Autores: MOTHÉ,DIMILA; AVILLA,LEONARDO S.; ZHAO,DESI; XIE,GUANGPU; SUN,BOYANG.
ABSTRACT The "Yanghecun specimen", a proboscidean specimen represented by a mandible from Miocene of China and previously described as Gomphotheriidae, is here reviewed and described as a new genus and species of Mammutidae: Sinomammut tobieni. This taxon is a longirostrine mastodon, lacking lower tusks, and bearing a wide last molar with oblique and non-inflated lophids, broad transverse interlophids, and yoke-like wear figures. Phylogenetic analysis of Mammutidae based on dental and mandibular features recovered S. tobieni as sister group of the mastodon Mammut. The longirostrine condition and the well-developed lower incisors seem to be primitive for Mammutidae, while the brevirostry is the derived condition, probably emerged during the middle Miocene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evolution; Longirostrine symphysis; Mammutidae; Miocene; Proboscidea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100065

Chemical and biological investigations on Nidularium innocentii Lemaire
Provedor de dados: 42
Autores: Chedier,Luciana Moreira; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200027

The first occurrence of the Order Mormonilloida (Copepoda) in the Tropical Southwest Atlantic Ocean
Provedor de dados: 42
Autores: MELO,PEDRO AUGUSTO M.C.; MELO JÚNIOR,MAURO DE; ARAÚJO,MOACYR; NEUMANN-LEITÃO,SIGRID.
This communication is the first report of the occurrence of the order Mormonilloida (Mormonilla phasma) in the tropical Southwestern Atlantic Ocean. Female individuals were found in surface waters from the shelf break state of Rio Grande do Norte (Northeastern Brazil) and between depths of 60 and 100 m in the epipelagic layer around the St. Peter and St. Paul Archipelago (equatorial Atlantic). This finding extends the vertical limits for this species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copepod; Equatorial; Mormonilloida; Mormonilla phasma; Oceanic island; Zooplankton.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100233

Thinning regimes and initial spacing for Eucalyptus plantations in Brazil
Provedor de dados: 42
Autores: FERRAZ FILHO,ANTONIO C.; MOLA-YUDEGO,BLAS; GONZÁLEZ-OLABARRIA,JOSÉ R.; SCOLFORO,JOSÉ ROBERTO S.
ABSTRACT This study focuses on the effects of different thinning regimes on clonal Eucalyptus plantations growth. Four different trials, planted in 1999 and located in Bahia and Espírito Santo States, were used. Aside from thinning, initial planting density, and post thinning fertilization application were also evaluated. Before canopy closure, and therefore before excessive competition between trees took place, it was found that stands planted under low densities (667 trees per hectare) presented a lower mortality proportion when compared to stand planted under higher densities (1111 trees per hectare). However, diameter growth prior to thinning operations was not statistically different between these two densities, presenting an overall mean of 4.9...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growing space; Forest management; Solid wood products; Stand density management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100255

The specificity of interactions between proteins and sulfated polysaccharides
Provedor de dados: 42
Autores: Mulloy,Barbara.
Sulfated polysaccharides are capable of binding with proteins at several levels of specificity. As highly acidic macromolecules, they can bind non-specifically to any basic patch on a protein surface at low ionic strength, and such interactions are not likely to be physiologically significant. On the other hand, several systems have been identified in which very specific substructures of sulfated polysaccharides confer high affinity for particular proteins; the best-known example of this is the pentasaccharide in heparin with high affinity for antithrombin, but other examples may be taken from the study of marine invertebrates: the importance of the fine structure of dermatan sulfate (DS) to its interaction with heparin cofactor II (HCII), and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sulfated polysaccharides; Fucans; Dermatan sulfate; Heparan sulfate; Heparin; Protein structure; Growth factors; Development.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400007

The gamma-Weibull distribution revisited
Provedor de dados: 42
Autores: Pogány,Tibor k.; Saxena,Ram k.
The five parameter gamma-Weibull distribution has been introduced by Leipnik and Pearce (2004). Nadarajah and Kotz (2007) have simplified it into four parameter form, using hypergeometric functions in some special cases. We show that the probability distribution function, all moments of positive order and the characteristic function of gamma-Weibull distribution of a random variable can be explicitely expressed in terms of the incomplete confluent Fox-Wright Psi-function, which is recently introduced by Srivastava and Pogány (2007). In the same time, we generalize certain results by Nadarajah and Kotz that follow as special cases of our findings.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma distribution; Weibull distribution; Confluent Fox-Wright 1Ψ0; Incomplete confluent Fox-Wright 1Ψ0.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200026

Pterodactyloid pterosaur bones from Cretaceous deposits of the Antarctic Peninsula
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.; RODRIGUES,TAISSA; COSTA,FABIANA R.; WEINSCHÜTZ,LUIZ C.; FIGUEIREDO,RODRIGO G.; SOUZA,GEOVANE A. DE; BRUM,ARTHUR S.; ELEUTÉRIO,LÚCIA H.S.; MUELLER,CARSTEN W.; SAYÃO,JULIANA M.
Abstract Fossil vertebrates from Antarctica are considerably rare, hampering our understanding of the evolutionary history of the biota from that continent. For several austral summers, the PALEOANTAR project has been carrying out fieldwork in the Antarctic Peninsula in search for fossils, particularly Cretaceous vertebrates. Among the specimens recovered so far are two bones referable to Pterosauria, more specifically to the Pterodacyloidea, the first volant reptiles from Antarctica to be fully described. MN 7800-V (part and counterpart) was recovered from a moraine at the Abernathy Flats (Santa Marta Formation, Lachman Crags Member, Santonian-Campanian) on James Ross Island. It is interpreted as the distal articulation of a first phalanx of the wing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antarctica; Antarctic Peninsula; Pterosauria; PALEOANTAR; Cretaceous.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400519

Associative diazotrophic bacteria in grass roots and soils from heavy metal contaminated sites
Provedor de dados: 42
Autores: Moreira,Fátima M.S.; Lange,Anderson; Klauberg-Filho,Osmar; Siqueira,José O.; Nóbrega,Rafaela S.A.; Lima,Adriana S.
This work aimed to evaluate density of associative diazotrophic bacteria populations in soil and grass root samples from heavy metal contaminated sites, and to characterize isolates from these populations, both, phenotypically (Zinc, Cadmium and NaCl tolerance in vitro, and protein profiles) and genotypically (16S rDNA sequencing), as compared to type strains of known diazotrophic species. Densities were evaluated by using NFb, Fam and JNFb media, commonly used for enrichment cultures of diazotrophic bacteria. Bacterial densities found in soil and grass root samples from contaminated sites were similar to those reported for agricultural soils. Azospirillum spp. isolates from contaminated sites and type strains from non-contaminated sites varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azospirillum; Zinc; Cadmium; Soil contaminants; Nitrogen-fixing bacteria.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400014

Invariants of germs of analytic differential equations in the complex plane
Provedor de dados: 42
Autores: Câmara,Leonardo M.
We study the classification of germs of differential equations in the complex plane giving a complete set of analytic invariants determining the analytic type of the underlying foliation. In particular we answer in affirmative a conjecture of S. Voronin, and generalize some previous results about dicritical singularities in a straightforward manner. Such problem has its origins in a conjecture proposed by R. Thom in the mid-1970s.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Singular foliations; Resolution of singularities; Holonomy; Nonabelian cohomology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100001

Systems with the integer rounding property in normal monomial subrings
Provedor de dados: 42
Autores: Dupont,Luis A.; Rentería-Márquez,Carlos; Villarreal,Rafael H.
Let C be a clutter and let A be its incidence matrix. If the linear system x &amp;gt; 0; x A &lt; 1 has the integer rounding property, we give a description of the canonical module and the a-invariant of certain normal subrings associated to C. If the clutter is a connected graph, we describe when the aforementioned linear system has the integer rounding property in combinatorial and algebraic terms using graph theory and the theory of Rees algebras. As a consequence we show that the extended Rees algebra of the edge ideal of a bipartite graph is Gorenstein if and only if the graph is unmixed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canonical module; A-invariant; Normal ideal; Perfect graph; Maximal cliques; Rees algebra; Ehrhart ring; Integer rounding property.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400002

Methodological development of a quality index for agricultural operations, for corn cultivation using multi-criterion analysis
Provedor de dados: 42
Autores: Lamparelli,Rubens A.C.; Dias,Hugo S.
One of the major problems in the Brazilian agriculture is related to the production loss in the field, which, due to many factors, is not being considered. This article has the objective to develop a methodology to identify a quality index which integrates some crop quality variables which are able to indicate how the crop is developing in terms of loss in the field. The results have showed that the strategy of multi-criterion analysis and Fuzzy logic proved to be important tools for the assessment and preparation of a quality index for corn production. The index proposed performed well in representing the quality of agricultural operations when compared with reality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual crop; Optimization; Fuzzy; Crop quality.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400020

Influence of accumulation of heaps of steel slag on the environment: determination of heavy metals content in the soils
Provedor de dados: 42
Autores: Garcia-Guinea,Javier; Correcher,Virgilio; Recio-Vazquez,Lorena; Crespo-Feo,Elena; Gonzalez-Martin,Rafael; Tormo,Laura.
The presence of high level of heavy metals involves a human healthy risk that could induce chronic diseases. This work reports on the metal contamination due to heaps of steel-slag accumulated during more than 40 years in allotments and industrial areas in the southern part of Madrid (Spain). Several slag and soil samples were collected in an area of 10 km² and characterized by different conventional (XRD and XRF) and no so common methods (ESEM, thermoluminescence and EDS-WDS). The analysis reveal the presence of: (i) important amounts of Fe (43%), Mg (26%), Cr (1.1%), Mn (4.6%), S (6.5%) in the form of Fe-rich slag phases (wustite, magnetite...), Si and Ca-rich phases (larnite, ghelenite...), Cr (chromite), Mn (bustamite) and graphite, (ii) traces of some...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDS; ESEM; Metal contamination; Steel slag; TL; XRD; XRF.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200003

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis
Provedor de dados: 42
Autores: Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.
Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016

Asymmetric bioreduction of β-ketoesters derivatives by Kluyveromyces marxianus: influence of molecular structure on the conversion and enantiomeric excess
Provedor de dados: 42
Autores: OLIVEIRA,SIMONE S.S.; BELLO,MURILO L.; RODRIGUES,CARLOS R.; AZEVEDO,PAULA L. DE; RAMOS,MARIA C.K.V.; AQUINO-NETO,FRANCISCO R. DE; FIAUX,SORELE B.; DIAS,LUIZA R.S.
ABSTRACT This study presents the bioreduction of six β-ketoesters by whole cells of Kluyveromyces marxianus and molecular investigation of a series of 13 β-ketoesters by hologram quantitative structure-activity relationship (HQSAR) in order to relate with conversion and enantiomeric excess of β-stereogenic-hydroxyesters obtained by the same methodology. Four of these were obtained as (R)-configuration and two (S)-configuration, among them four compounds exhibited &gt;99% enantiomeric excess. The β-ketoesters series LUMO maps showed that the β-carbon of the ketoester scaffold are exposed to undergo nucleophilic attack, suggesting a more favorable β-carbon side to enzymatic reduction based on adopted molecular conformation at the reaction moment. The HQSAR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biocatalysis; Β-ketoesters; Β-hydroxyesters; HQSAR; Whole cell bioreduction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401403

Screening for CLCN5 mutation in renal calcium stone formers patients
Provedor de dados: 42
Autores: Rebelo,Maria Alice P.; Tostes,Vera; Araújo,Nordeval C.; Martini,Sabrina V.; Botelho,Bruno F.; Guggino,William B.; Morales,Marcelo M.
Thirty-five patients (23 males and 12 females), age 35 ± 13 years old, presenting either idiopathic calcium nephrolithiasis, nephrocalcinosis or mild renal failure with idiopathic calcium nephrolithiasis were selected for the analysis of low molecular weight proteinuria and the possible mutations occurrence in the chloride channel gene CLCN5. The urinary ratio of beta2-microglobulin and creatinine (beta2M/Cr) was very high in a transplanted woman with nephrocalcinosis (&gt;3.23 mg/mmol) and slightly high in five patients (&gt;0.052 or &lt; 1.0 mg/mmol) with multiple urological manipulations. Other studied patients showed beta2M/Cr ratio at normal range (0.003-0.052 mg/mmol) without gender difference (p &gt; 0.05). Mutation analysis of CLCN5 gene was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nephrolithiasis; Nephrocalcinosis; Low-molecular-weight proteinuri; CLCN5 mutation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100007

Bits and q-bits as versatility measures
Provedor de dados: 42
Autores: Piqueira,José R.C.
Using Shannon information theory is a common strategy to measure any kind of variability in a signal or phenomenon. Some methods were developed to adapt information entropy measures to bird song data trying to emphasize its versatility aspect. This classical approach, using the concept of bit, produces interesting results. Now, the original idea developed in this paper is to use the quantum information theory and the quantum bit (q-bit) concept in order to provide a more complete vision of the experimental results.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bit; Complexity; Entropy; Q-bit; Measure; Versatility.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200035

Community structure of the ichthyofauna associated with seagrass beds ( Halodule wrightii) in Formoso River estuary - Pernambuco, Brazil
Provedor de dados: 42
Autores: Pereira,Pedro H.C.; Ferreira,Beatrice P.; Rezende,Sérgio M.
Seagrass beds are used by juvenile fishes in different ways, generally as nursery sites, shelter from predators, reducing competition and increasing availability of food resources, thus establishing a relationship of connectivity with other ecosystems. In the present study, the community structure of the ichthyofauna associated with seagrass beds on the Formoso River (Pernambuco - Brazil) was evaluated during the winter of 2008. Twenty-seven manual trawls (15 daytime and 12 nighttime) were performed, and a total of 358 fishes belonging to 18 families, 21 genus and 25 species were collected. The Catch Per Unit Effort (CPUE) by trawling average was 13.5 and 4.95 individuals per species per trawl. The most abundant families were Scaridae (n = 111),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Connectivity; Seagrass beds; Reef fishes; Diversity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300009

Early Devonian (Late Emsian) shark fin remains (Chondrichthyes) from the Paraná Basin, southern Brazil
Provedor de dados: 42
Autores: RICHTER,MARTHA; BOSETTI,ELVIO P.; HORODYSKI,RODRIGO S.
ABSTRACT We report on the pioneering discovery of Devonian fish remains in the Paraná Basin, which represents the southernmost record of fishes from that period in mainland South America. The material comes from an outcrop at the lower portion of the São Domingos Formation, within Sequence C of the Paraná-Apucarana sub-basin in Tibagi, State of Paraná. Marine invertebrates are abundant in the same strata. The dark colored fish remains were collected in situ and represent natural moulds of partially articulated shark fin rays (radials). No elements such as teeth or prismatic cartilage have been preserved with the fins rays. This can be attributed to the dissolution of calcium-phosphatic minerals at the early stages of fossilization due to diagenetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chondrichthyes; Devonian; Gondwana; Paraná Basin; Southern Brazil; Taphonomy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100103

New information on Riograndia guaibensis Bonaparte, Ferigolo &amp;amp; Ribeiro, 2001 (Eucynodontia, Tritheledontidae) from the Late Triassic of southern Brazil: anatomical and biostratigraphic implications
Provedor de dados: 42
Autores: Soares,Marina B.; Schultz,Cesar L.; Horn,Bruno L.D.
The tritheledontid Riograndia guaibensis was the first cynodont described for the "Caturrita Formation" fauna from the Late Triassic of southern Brazil (Santa Maria 2 Sequence). The type materials did not preserve anatomical information regarding braincase, occiput, basicranium, zygomatic arch, postdentary bones and craniomandibular joint. Here new materials are described and supply the missing information. Riograndia shows a suite of important anatomical features quite derived among the non-mammaliaform eucynodonts, such as the partial closure of the medial orbital wall and braincase, extensive secondary osseous palate, wide primary palate, basicranium with jugular foramen separated from the periphery of fenestra rotunda, narrow zygomatic arch and much...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caturrita Formation; Cynodontia; Late Triassic; Riograndia; Tritheledontidae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100021

Tunneling effects in resonant acoustic scattering of an air bubble in unbounded water
Provedor de dados: 42
Autores: SIMÃO,ANDRÉ G.; GUIMARÃES,LUIZ G.
Abstract The problem of acoustic scattering of a gaseous spherical bubble immersed within unbounded liquid surrounding is considered in this work. The theory of partial wave expansion related to this problem is revisited. A physical model based on the analogy between acoustic scattering and potential scattering in quantum mechanics is proposed to describe and interpret the acoustical natural oscillation modes of the bubble, namely, the resonances. In this context, a physical model is devised in order to describe the air water interface and the implications of the high density contrast on the various regimes of the scattering resonances. The main results are presented in terms of resonance lifetime periods and quality factors. The explicit numerical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic Scattering; Minnaert Resonance; Semi-Classical Methods; Whispering Gallery Modes; Mie and Rayleigh Scattering.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300765

Influence of hesperidin and vitamin C on glycemic parameters, lipid profile, and DNA damage in rats treated with sucrose overload
Provedor de dados: 42
Autores: FRANKE,SILVIA I.R.; MOLZ,PATRÍCIA; MAI,CAMILA; ELLWANGER,JOEL H.; ZENKNER,FERNANDA F.; HORTA,JORGE A.; PRÁ,DANIEL.
ABSTRACT We evaluated the influence of hesperidin and vitamin C (VitC) on glycemic parameters, lipid profile, and DNA damage in male Wistar rats treated with sucrose overload. Rats were divided into six experimental groups: I-water control; II-sucrose control; III-hesperidin control; IV-VitC control; V-co-treatment of sucrose plus hesperidin; VI-co-treatment of sucrose plus VitC. We measured the levels of triglycerides, total cholesterol, HDL-c, LDL-c, fasting glucose, and glycated hemoglobin (A1C). DNA damage was evaluated in blood and brain cells using the comet assay and the micronucleus test was used to evaluate chromosomal damages in the rat bone marrow. Co-treatment with VitC, but not with hesperidin, normalized the serum glucose. No effect of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA damage; Hesperidin; Glycated hemoglobin; Lipid profile; Sucrose; Vitamin C.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502203

Contrasting bee pollination in two co-occurring distylic species of Cordia (Cordiaceae, Boraginales) in the Brazilian semi-arid Caatinga: generalist in C. globosa vs. specialist in C. leucocephala
Provedor de dados: 42
Autores: Machado,Isabel C.; Lopes,Ariadna V.; Sazima,Marlies.
In this study we compare the reproductive biology of Cordia globosa and C. leucocephala (Cordiaceae, Boraginales; formerly referred to Boraginaceae) to understand the functioning of the floral morphs and the relations with their effective pollinators. The species are synchronopatric, distylic, and self-incompatible. Though they share melittophilous traits, the main visitor and pollinator of C. globosa was the generalist and exotic bee Apis mellifera, while the only one of C. leucocephala was the oligoletic bee Ceblurgus longipalpis. These two latter species are restricted to the Caatinga of NE Brazil, contrasting with the wide distribution of Cordia globosa. While the fruit-set for C. globosa was high, independently if the pollen donor/stigma receptor was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Caatinga; Ceblurgus longipalpis; Cordia globosa; Cordia leucocephala; Dry forest; Heterostyly; Oligolecty.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400010

On the geometry of Poincaré's problem for one-dimensional projective foliations
Provedor de dados: 42
Autores: SOARES,MARCIO G.
We consider the question of relating extrinsic geometric characters of a smooth irreducible complex projective variety, which is invariant by a one-dimensional holomorphic foliation on a complex projective space, to geometric objects associated to the foliation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic foliations; Invariant varieties; Polar classes; Degrees.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400001

Effects of diflubenzuron on associated insect fauna with Anopheles(Diptera: Culicidae) in laboratory, partial-field, and field conditions in the Central Amazon
Provedor de dados: 42
Autores: FERREIRA,FRANCISCO A.S.; ARCOS,ADRIANO N.; MAIA,NATALIELLI S.G.; SAMPAIO,RAQUEL T.M.; COSTA,FÁBIO M.; RODRIGUES,ILÉA B.; TADEI,WANDERLI P.
Abstract  This study aimed to analyze the possible effects of diflubenzuron on the associated insect fauna under laboratory, semi-field and field conditions. Laboratory bioassays were performed in aquariums with mortality readings (%) every 24h until 96h, and in semi-fields, insects were kept in basins with readings every 24h for up to 12 days, in triplicates and a control. In the field experiment, a collection was performed before the application of diflubenzuron in ten brick factory pits (25m²) and 15 post-application. The values of LC50 and LC90 for Chironomus were 2.77x10-3g/L and 0.86g/L, respectively, and for Buenoa, they were 0.019g/L and 0.92g/L, a strong relationship was observed between mortality and exposure time (r²&gt;0.8) in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Chironomus sp.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100722

Morphoanatomical injuries in Pistia stratiotes L. (Araceae) as a result of exposure to clomazone in water
Provedor de dados: 42
Autores: RIBEIRO,VICTOR HUGO VIDAL; COUTINHO,ÍTALO ANTÔNIO COTTA; ALENCAR,BRENDA THAIS BARBALHO; CABRAL,CÁSSIA MICHELLE; SANTOS,JOSÉ BARBOSA DOS; FERREIRA,EVANDER ALVES; FRANCINO,DAYANA MARIA TEODORO.
Abstract  Contamination of water sources due to herbicide is of great concern. Clomazone is a pesticide with a high contamination potential which could possibility lixiviate to water streams. Changes caused by residual herbicide include flora modifications which are generally detrimental for some species. The lack of morphological studies performed in aquatic plants exposed to herbicide-contaminated environments has encouraged the development of our research. For the first time, we present a study that aimed to evaluate leaf injuries visible to the naked eye as well as microscopical effects which may be caused by clomazone on Pistia stratiotes. Pistia stratiotes was subjected to five concentrations of clomazone. Our analysis showed leaf injuries,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic macrophyte; Clomazone; Herbicide; Hormesis; Leaf anatomy; Water lettuce.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201003

What is hidden in the biodiversity? The role of natural products and medicinal chemistry in the drug discovery process
Provedor de dados: 42
Autores: BARREIRO,ELIEZER J.
Abstract Abstract: This manuscript describes the role of natural products in the process of drug discovery. In fact, several different natural compounds have been used as inspiration to develop new drugs. Some relevant examples are presented in chronological order.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal chemistry; Natural biophores as drug scaffolds; Natural products as lead-compounds to drugs; New drugs candidates.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600401

Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae)
Provedor de dados: 42
Autores: PENITENTE,MANOLO; VOLTOLIN,TATIANA A.; SENHORINI,JOSé A.; BORTOLOZZI,JEHUD; FORESTI,FAUSTO; PORTO-FORESTI,FáBIO.
Cytogenetic studies were developed in Prochilodus lineatus (Valenciennes 1836), describing an interesting system of small supernumerary chromosomes. The purpose of this work is to study the frequency and morphology of B chromosomes in individuals from the parental line and the inheritance patterns of these elements in individuals obtained from controlled crosses in the species P. lineatus. The transmission rate of B chromosomes revealed a kB=0.388 for the acrocentric type, a kB=0.507 for the metacentric type and a kB=0.526 for the submetacentric type. The obtained results raise hypothesis that B-acrocentric chromosomes are involved in an extinction process in this species, while the metacentric and submetacentric supernumerary elements comprises a neutral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Supernumerary chromosomes; Controlled crosses; Curimbatá; Cytogenetic; Inheritance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401371

Tori embedded in S³ with dense asymptotic lines
Provedor de dados: 42
Autores: Garcia,Ronaldo; Sotomayor,Jorge.
In this paper are given examples of tori T² embedded in S³ with all their asymptotic lines dense.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymptotic lines; Recurrence; Clifford torus; Variational equation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100003

Evaluation of methods for the quantification of ether extract contents in forage and cattle feces
Provedor de dados: 42
Autores: BARBOSA,MARCÍLIA M.; DETMANN,EDENIO; VALADARES FILHO,SEBASTIÃO C.; DETMANN,KELLY S.C.; FRANCO,MARCIA O.; BATISTA,ERICK D.; ROCHA,GABRIEL C.
ABSTRACT The objective of this study was to compare the estimates of ether extract (EE) contents obtained by the Randall method and by the high-temperature method of the American Oil Chemist's Society (AOCS; Am 5-04) in forages (n = 20) and cattle feces (n = 15). The EE contents were quantified by using the Randall extraction or AOCS method and XT4 filter bags or cartridges made of qualitative filter paper (80 g/m²) as containers for the samples. It was also evaluated the loss of particles, and concentration of residual chlorophyll after extraction and the recovery of protein and minerals in the material subjected to extraction. Significant interaction was observed between extraction method and material for EE contents. The EE estimates using the AOCS...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude fat; Feed analysis; Filter bags; Non-polar compounds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301295

Reproduction and structure of the population of the Chaetognath Parasagitta friderici in Guanabara Bay (Brazil) based on short term sampling
Provedor de dados: 42
Autores: Mendes,Fabiana; Figueiredo,Gisela M. de; Valentin,Jean L.
The aim of this study was to describe the total density, densities of developmental stages and the reproduction period of Parasagitta friderici. Weekly samples were collected at one station in the channel of Guanabara Bay, Rio de Janeiro, during one year. Three vertical hauls were made for each sample, and P. friderici was separated, the developmental stages were identified, and body length (BL), ovary length (OL) and seminal vesicle width (SVW) were measured. Throughout the year P. friderici was the most abundant chaetognath species occurring in all four developmental stages, the densities of which varied from week to week. Higher densities of adults occurred in the spring, followed by peaks of juveniles in the summer. Although P. friderici seems to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaetognath; Development stage; Guanabara Bay; Reproduction.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100010

Altered hyaluronic acid content in tear fluid of patients with adenoviral conjunctivitis
Provedor de dados: 42
Autores: DREYFUSS,JULIANA L.; REGATIERI,CAIO V.; COELHO,BRUNO; BARBOSA,JOSÉ B.; FREITAS,DENISE DE; NADER,HELENA B.; MARTINS,JOÃO R.
The adenoviral conjunctivitis is one of the biggest causes of conjunctival infection in the world. Conjunctivitis causes relatively nonspecific symptoms, as hyperaemia and chemosis. Even after biomicroscopy, complex laboratory tests, such as viral culture, are necessary to identify the pathogen or its etiology. To contribute to the better understanding of the pathobiology of the adenoviral conjunctivitis, the tear fluids of patients with unilateral acute adenovirus conjunctivitis (UAAC), normal donors (control) and patients with allergic conjunctivitis were analyzed. Tear samples were collected with Schirmer strips from control, allergic conjunctivitis and UAAC patients, diagnosed by clinical signs. UAAC tears were tested positive in viral cultures. After...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conjunctivitis; Glycosaminoglycans; Hyaluronic acid; Tear film.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100455

Heartwood and sapwood in eucalyptus trees: non-conventional approach to wood quality
Provedor de dados: 42
Autores: CHERELLI,SABRINA G.; SARTORI,MARIA MÁRCIA P.; PRÓSPERO,ANDRÉ G.; BALLARIN,ADRIANO W.
ABSTRACT This study evaluated the quality of heartwood and sapwood from mature trees of three species of Eucalyptus, by means of the qualification of their proportion, determination of basic and apparent density using non-destructive attenuation of gamma radiation technique and calculation of the density uniformity index. Six trees of each species (Eucalyptus grandis - 18 years old, Eucalyptus tereticornis - 35 years old and Corymbia citriodora - 28 years old) were used in the experimental program. The heartwood and sapwood were delimited by macroscopic analysis and the calculation of areas and percentage of heartwood and sapwood were performed using digital image. The uniformity index was calculated following methodology which numerically quantifies the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma radiation; Image analysis; Eucalyptus; Density uniformity index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100425

Magnetic nanostructures
Provedor de dados: 42
Autores: AGUIAR,FLAVIO M. DE; AZEVEDO,ANTONIO; REZENDE,SERGIO M.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300026

c-Ki-ras oncogene amplification and FGF2 signaling pathways in the mouse Y1 adrenocortical cell line
Provedor de dados: 42
Autores: Forti,Fábio L.; Costa,Érico T.; Rocha,Kátia M.; Moraes,Miriam S.; Armelin,Hugo A.
The mouse Y1 adrenocortical tumor cell line is highly responsive to FGF2-(Fibroblast Growth Factor 2) and possesses amplified and over-expressed c-Ki-ras proto-oncogene. We previously reported that this genetic lesion leads to high constitutive levels of activation of the c-Ki-Ras-GTP-&gt;PI3K-&gt;Akt signaling pathway (Forti et al. 2002). On the other hand, activation levels of another important pathway downstream of c-Ki-Ras-GTP, namely, Raf-&gt;MEK-&gt;ERK, remain strictly dependent on FGF2 stimulation (Rocha et al. 2003). Here we show that, first, FGF2 transiently up-regulates the c-Ki-Ras-GTP-&gt;PI3K-&gt;Akt pathway, in spite of its high basal levels. Second, c-Ki-Ras-GTP transient up-regulation likely underlies activation of the ERK1/2 pathway by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FGF2; Adrenocortical tumor cells; C-ki-ras; C-h-ras; ERK.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200005

1,4- Addition of diazomethane to a heterodiene: a direct preparation of the oxazolic ring
Provedor de dados: 42
Autores: Emery,Flávio da S.; Silva,Raphael S.F.; Moura,Kelly C.G. de; Pinto,Maria C.F.R.; Amorim,Mauro B.; Malta,Valéria R.S.; Santos,Regina H.A.; Honório,Kátia M.; Silva,Albérico B.F. da; Pinto,Antonio V.
The reaction of naphthoquinone-oximes (3) and (4) with diazomethane yields directly, in one step, the oxazoles (5) and (6), respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quinones; Oximes; Diazomethane; Oxazoles.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100004

Effects of diet supplementation with Camu-camu (Myrciaria dubia HBK McVaugh) fruit in a rat model of diet-induced obesity
Provedor de dados: 42
Autores: Nascimento,Ozanildo V; Boleti,Ana P.A; Yuyama,Lucia K.O; Lima,Emerson S.
Amazonian Camu-camu fruit (Myrciaria dubia HBK Mc Vaugh) has attracted interest from food and cosmetics industries because of its rich content of vitamin C, flavonoids and anthocyanins. The goal of this study was investigates the antiobesity action of the ingestion of the Camu-camu pulp in a rat model of diet-induced obesity. Wistar rats with obesity induced by subcutaneous injection of monosodium glutamate receiving diet ad libitum. The rats were divided in two groups: an experimental group that ingested 25 mL/day of Camu-camu pulp (CCG) and a non treated group (CG). After 12 weeks, the animals were sacrificed. Blood, liver, heart, white adipose tissues were collected and weighted, biochemical and inflammatory profiles were determinate as well. Animals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian fruit; Flavonoids; Lipid profile; Myrciaria dubia; Obesity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100355

Effect of temperature on the reproduction of Bracon vulgaris Ashmead (Hymenoptera: Braconidae), a parasitoid of the cotton boll weevil
Provedor de dados: 42
Autores: Ramalho,Francisco S.; Wanderley,Paulo A.; Malaquias,José B.; Fernandes,Francisco S.; Nascimento,Antônio R.B.; Zanuncio,José C.
This research studied the effect of temperature on the reproduction of Bracon vulgaris Ashmead, an ectoparasitoid of cotton boll weevil ( Anthonomus grandis Boheman) at constant temperatures of 20, 25 and 30ºC, 70 ± 10% RH and a photophase of 14 h. Females of the parasitoid produced a greater number of eggs when exposed to 25ºC (124.65 eggs) in relation to those exposed to 20 (43.40 eggs) and 30ºC (49.60 eggs). The number of parasitized larvae per female of B. vulgaris at 25ºC (71.75) was greater than at 20ºC (31.40) and 30ºC (25.15). The daily intrinsic rates of increase (r m) were - 0.007 at 20ºC, 0.07 at 25ºC and 0.03 at 30ºC, revealing that the temperature of 25ºC produced increases of 1,100 and 133% in the value r m in relation to temperatures of 20...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ectoparasitoid; Anthonomus grandis Boheman; Biology; Life and fertility tables.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300020

Economic valuation of the Emas waterfall, Mogi-Guaçu River, SP, Brazil
Provedor de dados: 42
Autores: Peixer,Janice; Giacomini,Henrique C.; Petrere Jr,Miguel.
The Emas waterfall in Mogi-Guaçu River is regionally recognized as an important fishing spot and touristic place. The first reports of the professional and sport fishing there date back from the 30's, which is the same period when the tourism took place. The present paper provides an environmental valuation of this place and an assessment of the differences among the major groups of people using the area. During 2006 we interviewed 33 professional fishers, 107 sport fishers, 45 tourists and 103 excursionists in order to estimate the Willingness to Pay (WTP) for each category and to analyze the influence of socioeconomic factors by means of logistic regressions and ANCOVAs. The WTP of professional fisher was significantly influenced by age and education,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contingent valuation method; Professional fishing; Sport fishing; Tourism; Willingness-to-pay.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400016

Milk production systems in Southern Brazil
Provedor de dados: 42
Autores: TELLES,TIAGO S.; BACCHI,MATHEUS D.; COSTA,GUSTAVO V. DA; SCHUNTZEMBERGER,AMANDA M.S.
Abstract  The aim of this study was to verify the dynamics of milk production in Southern Brazil, analyzing the spatial distribution, evolution and structure of bovine milk production systems in the dairy-specialized microregions. To this end, annual data from 2000 to 2015 are drawn from the Municipal Livestock Survey, reported by the Instituto Brasileiro de Geografia e Estatística, and the Programa Nacional de Fortalecimento da Agricultura Familiar, reported by the Banco Central do Brasil. Location quotient analyses, principal component analyses and clustering analyses are applied. Results of the location quotient analysis indicate that, of the 94 microregions in Southern Brazil, 36 are specialized in milk production. Two principal components were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal production; Spatial analysis; Agricultural economics; Regional development.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101201

A possible chelonian egg from the Brazilian late cretaceous
Provedor de dados: 42
Autores: AZEVEDO,SERGIO ALEX; GALLO,VALÉRIA; FERIGOLO,JORGE.
This paper describes a possible fossil egg proceeding from the Bauru Group, Late Cretaceous of Paraná Basin, Brazil. External morphology, dimensions, texture and shell ornamentation examined under electron microscopy show close resemblance to the Recent podocnemidid chelonian eggs. Association with bony material in the outcrop suggests that it is related to a species of Podocnemis. Computerized tomography reveals a high density outer region corresponding to the shell component layers, and successive layers with decreasing density towards the nucleus. An area of high density in the central region may represent remains of an embryo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fossil egg; Chelonian; Late Cretaceous; Bauru Group.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200007

Fertility Life Table, Population Parameters and Biotic Potential of Helicoverpa gelotopoeon (Dyar) (Lepidoptera: Noctuidae)
Provedor de dados: 42
Autores: HERRERO,MARÍA I.; DAMI,LUCIANA C.; FOGLIATA,SOFÍA V.; CASMUZ,AUGUSTO S.; GÓMEZ,DANIEL R. SOSA; GASTAMINZA,GERARDO A.; MURÚA,MARÍA G.
Abstract Helicoverpa gelotopoeon is an endemic pest of South America that affects soybean and other important crops. Life tables are a fundamental tool used to study insect populations, resulting in crucial information for integrated pest management programs. Therefore, the aim of this study was to evaluate the biotic potential and the construction of a life table of this species under laboratory conditions. The biological parameters that showed significant differences between male and female were pupal duration, longevity and life span, which were all longer in duration for males. The net reproductive rate (R0) was 95.49, the mean generation time (T) 37.53, and the instantaneous rate of population increase “r” 0.12. The population doubling time (DT) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Life cycle; Pest management; Survival; Adult longevity; South American bollworm.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703831

Geochemical behaviour of trace elements during fractional crystallization and crustal assimilation of the felsic alkaline magmas of the state of Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: MOTOKI,AKIHISA; SICHEL,SUSANNA E.; VARGAS,THAIS; MELO,DEAN P.; MOTOKI,KENJI F.
ABSTRACT This paper presents geochemical behaviour of trace elements of the felsic alkaline rocks of the state of Rio de Janeiro, Brazil, with special attention of fractional crystallization and continental crust assimilation. Fractionation of leucite and K-feldspar increases Rb/K and decreases K2O/(K2O+Na2O). Primitive nepheline syenite magmas have low Zr/TiO2, Sr, and Ba. On the Nb/Y vs. Zr/TiO2 diagram, these rocks are projected on the field of alkaline basalt, basanite, and nephelinite, instead of phonolite. Well-fractionated peralkaline nepheline syenite has high Zr/TiO2 but there are no zircon. The diagrams of silica saturation index (SSI) distinguish the trends originated form fractional crystallization and crustal assimilation. In the field of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nepheline syenite; Alkaline syenite; Trace elements; Rare earth elements; Fractional crystallization; Continental crust assimilation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501959

Management of pruning and evaluation in blackberry cultivars in relation to productive characteristics and bioactive compounds
Provedor de dados: 42
Autores: LUGARESI,ADRIANA; UBERTI,ALISON; GIACOBBO,CLEVISON L.; LOVATTO,MAIKE; GIRARDI,GIAN C.; WAGNER JUNIOR,AMÉRICO.
Abstract The goal of this work was to evaluate blackberry cultivars in terms of productivity and bioactive compounds. Two experiments were conducted: in the first experiment four cultivars were evaluated (Cherokee, Guarani, BRS-Tupy and Xavante). In the second experiment, the effects of pruning management in the BRS-Tupy cultivar were evaluated with the following treatments: drastic winter pruning (zero primocane), and maintenance of two, three or four primocanes in the winter pruning. Vegetative, productive and fruit quality characteristics were determined, including measurement of bioactive compounds. Among the cultivars, the cultivar BRS-Tupy was superior in terms of productive characteristics, but for content of anthocyanins and flavonoids, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubus sp; Primocane management; Bioactive compounds; Cultivars.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703879

Paralavas in the Cretaceous Paraná volcanic province, Brazil - A genetic interpretation of the volcanic rocks containing phenocrysts and glass
Provedor de dados: 42
Autores: BAGGIO,SÉRGIO B.; HARTMANN,LÉO A.; BELLO,ROSA M.S.
ABSTRACT The occurrences of glassy rocks containing long and curved phenocrysts in the Paraná volcanic province, South America, are here interpreted as paralavas. The large number of thin (0.1-0.5 m) dikes and sills of glassy volcanic rocks with hopper, hollow or curved, large crystals of clinopyroxene (up to 10 cm), plagioclase (up to 1 cm), magnetite and apatite are contained in the core of thick (&gt;70 m) pahoehoe flows. They are strongly concentrated in the state of Paraná, coincident with the presence of the large number of dikes in the Ponta Grossa arch. These rocks were previously defined as pegmatites, although other names have also been used. A paralava is here interpreted as the product of melting of basaltic rocks following varied, successive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paralava; Paraná volcanic province; Pyrometamorphism; Remelting; Metal remobilization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602167

Main causes of bird-window collisions: a review
Provedor de dados: 42
Autores: BASILIO,LAY G.; MORENO,DANIELE J.; PIRATELLI,AUGUSTO J.
Abstract  Bird-window collisions are a major cause of bird mortality in the world; up to one billion birds die each year from collisions with glass panes in North America alone. However, relatively little attention had been given to this issue in the broad scientific literature, despite a recent increase in the number of papers. In this paper, the indexed literature on bird-window collisions was reviewed, specifically addressing the causal factors. The search retrieved 53 papers, mostly from North America. The factors linked to higher collision rates were large areas of continuous glass, the presence of nearby vegetation and feeders, bird migration, abundance, and behavior. Several factors were site-specific, preventing the global extrapolation of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bird strikes; Bird-friendly buildings; Glass panes; Human-made structures; Urban birds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100706

Enzymatic reactions involving the heteroatoms from organic substrates
Provedor de dados: 42
Autores: MARQUES NETTO,CATERINA G.C.; PALMEIRA,DAYVSON J.; BRONDANI,PATRÍCIA B.; ANDRADE,LEANDRO H.
ABSTRACT Several enzymatic reactions of heteroatom-containing compounds have been explored as unnatural substrates. Considerable advances related to the search for efficient enzymatic systems able to support a broader substrate scope with high catalytic performance are described in the literature. These reports include mainly native and mutated enzymes and whole cells biocatalysis. Herein, we describe the historical background along with the progress of biocatalyzed reactions involving the heteroatom(S, Se, B, P and Si) from hetero-organic substrates.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heteroatom; Biocatalysis; Enzymes; Biotransformation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200943

Stonemeal of amazon soils with sediments from reservoirs: a case study of remineralization of the tucuruí degraded land for agroforest reclamation
Provedor de dados: 42
Autores: THEODORO,SUZI H.; LEONARDOS,OTHON H.; ROCHA,EDUARDO; MACEDO,IRIS; REGO,KLEYSSON G.
This study suggests the employment of accumulated sediments in the reservoir of Tucuruí (Pará /Brazil) to remineralize the surrounding degraded soils. The approach was based on the principles of stonemeal technology. It suggests that the soil can be rejuvenated by crushed rocks rich in macro and micronutrients. Removal of the sediments for agricultural use will bring benefits to family farmers and increase the life cycle of the reservoir and, therefore, energy generation. Geochemical data on retained sediments, soils and rocks in the area of influence of the reservoir were evaluated regarding nutrient transport mechanisms and soil-fertility potential. Results show that sediments from the reservoir contain nutrients levels at least one order of magnitude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochemistry; Sediments; Reservoir; Agroforestry; Sustainable development.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100023

Stenospermy and seed development in the “Brazilian seedless” variety of sugar apple (Annona squamosa)
Provedor de dados: 42
Autores: SANTOS,RAYANE C. DOS; RIBEIRO,LEONARDO M.; MERCADANTE-SIMÕES,MARIA OLÍVIA; COSTA,MÁRCIA R.; NIETSCHE,SILVIA; PEREIRA,MARLON C.T.
Stenospermy was identified in naturally occurring sugar-apple (Annona squamosa) mutants with great potential for use in genetic improvement programs. However, to date, there have been no detailed studies of the development of aspermic fruit in this species. The aim of the present study was to characterize the anatomy of developing fruit in the ‘Brazilian Seedless’ mutant. Flower buds in pre-anthesis and developing fruits were subjected to common plant anatomy techniques. The abnormal ovules are unitegmic and orthotropic and have a long funiculus. There is evidence of fertilization, including the presence of embryos in early development and the proliferation of starch grains in the embryo sac. However, the embryos and embryo sac degenerate, although this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annonaceae; Seedless fruits; Fruit development; Stenospermy; Nucellus; Perisperm.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402101

Biochronostratigraphy and paleoenvironment analysis of Neogene deposits from the Pelotas Basin (well 2-TG-96-RS), Southernmost Brazil
Provedor de dados: 42
Autores: SILVA,WAGNER G.; ZERFASS,GEISE S.A.; SOUZA,PAULO A.; HELENES,JAVIER.
This paper presents the integration of micropaleontological (palynology and foraminifera) and isotopic (87Sr/86Sr) analysis of a selected interval from the well 2-TG-96-RS, drilled on the onshore portion of the Pelotas Basin, Rio Grande do Sul, Brazil. A total of eight samples of the section between 140.20 and 73.50 m in depth was selected for palynological analysis, revealing diversified and abundant palynomorph associations. Species of spores, pollen grains and dinoflagellate cysts are the most common palynomorphs found. Planktic and benthic calcareous foraminifera were recovered from the lowest two levels of the section (140.20 and 134.30 m). Based on the stratigraphic range of the species of dinoflagellate cysts and sporomorphs, a span age from Late...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micropaleontology; Biostratigraphy; Neogene; Pelotas Basin.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401565

A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil
Provedor de dados: 42
Autores: PAULIV,VICTOR E.; DIAS,ELISEU V.; SEDOR,FERNANDO A.; RIBEIRO,ANA MARIA.
The Brazilian records on Xenacanthiformes include teeth and cephalic spines from the Parnaíba, Amazonas and Paraná basins. This work describes a new species of Xenacanthidae, collected in an outcrop of Serrinha Member of Rio do Rasto Formation (Wordian to Wuchiapingian), Paraná Basin, municipality of Jacarezinho, State of Paraná. The teeth of the new species are two or three-cuspidated and the aboral surface show a smooth concavity and one rounded basal tubercle. The coronal surface presents one semi-spherical and subcircular coronal button, and also two lateral main cusps and one central (when present) with less than one fifth of the size of the lateral cusps in the labial portion. The lateral cusps are asymmetric or symmetric, rounded in transversal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Permian; Xenacanthimorpha; Xenacanthidae; Xenacanthus; Shark teeth.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100135

Phenotypic plasticity of Neonotonia wightii and Pueraria phaseoloidesgrown under different light intensities
Provedor de dados: 42
Autores: SANTOS,LEONARDO D.T.; CRUZ,LEANDRO R. DA; SANTOS,SAMUEL A. DOS; SANT'ANNA-SANTOS,BRUNO F.; SANTOS,IZABELA T. DOS; OLIVEIRA,ARIANE M. DE; BARROS,RODRIGO E.; SANTOS,MÁRCIA V.; FARIA,RODRIGO M.
Plants have the ability to undergo morphophysiological changes based on availability of light. The present study evaluated biomass accumulation, leaf morphoanatomy and physiology of Neonotonia wightii andPueraria phaseoloides grown in full sunlight, as well as in 30% and 50% shade. Two assays were performed, one for each species, using a randomized block design with 10 replicates. A higher accumulation of fresh mass in the shoot of the plants was observed for both species under cultivation in 50% shade, while no differences were detected between the full sunlight and 30% shade. N. wightii and P. phaseoloides showed increase in area and reduction in thickness leaf when cultivated in 50% shade. There were no changes in photosynthetic rate, stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptation; Fabaceae; Morphophysiology; Shading.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100519

Climatically-mediated landcover change: impacts on Brazilian territory
Provedor de dados: 42
Autores: ZANIN,MARINA; TESSAROLO,GEIZIANE; MACHADO,NATHÁLIA; ALBERNAZ,ANA LUISA M.
ABSTRACT In the face of climate change threats, governments are drawing attention to policies for mitigating its effects on biodiversity. However, the lack of distribution data makes predictions at species level a difficult task, mainly in regions of higher biodiversity. To overcome this problem, we use native landcover as a surrogate biodiversity, because it can represent specialized habitat for species, and investigate the effects of future climate change on Brazilian biomes. We characterize the climatic niches of native landcover and use ecological niche modeling to predict the potential distribution under current and future climate scenarios. Our results highlight expansion of the distribution of open vegetation and the contraction of closed forests....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Brazil; Ecological niche modeling; Native landcover; Biomes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300939

Apparent digestibility of conventional and alternative feedstuffs by hybrid tambacu juveniles
Provedor de dados: 42
Autores: BICUDO,ÁLVARO J.A.; ARAUJO,THIAGO A.T.; BRAGA,LUÍS G.T.; TONINI,WILLIAM C.T.; HISANO,HAMILTON.
ABSTRACT The apparent digestibility coefficients (ADC’s) of dry matter (DM), crude protein (CP), and gross energy (GE) of conventional feedstuffs (cottonseed meal-CSM, soybean meal-SBM, wheat bran-WHB, corn-COR) and regional alternative feedstuffs (common bean residue meal-CBR, mesquite meal-MES, pasta by-product meal-PBM) were determined for hybrid juvenile tambacu Colossoma macropomum × Piaractus mesopotamicus. The apparent DM and GE digestibility of feedstuffs decreased (p&lt;0.05) as fiber content of the ingredients increased. No differences (p&gt;0.05) were found among ADC’s of PBM and COR. The lowest CP ADC among energy sources was observed in MES; the lowest CP ADC among plant protein sources was observed in CBR. Information about the ADC’s of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characin; Fish nutrition; Hybrid fish; Nutritional value.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100471

Dirac's æther in curved spacetime-II: the geometric amplification of the cosmic magnetic induction
Provedor de dados: 42
Autores: Carvalho,Marcelo; Oliveira,Alexandre L.; Rabaça,Carlos R.
We search for an amplification mechanism of the seed cosmic magnetic induction by studying a new version of the Dirac's æther in a curved cosmological background. We find that the variation of the scale factor R(t) with cosmic time brings to the magnetic field the desired effect of amplification, that we call geometric amplification.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dirac's æther; Magnetic induction; Electromagnetism.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100002

Distributional patterns of †Mawsoniidae (Sarcopterygii: Actinistia)
Provedor de dados: 42
Autores: MIGUEL,RAPHAEL; GALLO,VALÉRIA; MORRONE,JUAN J.
Mawsoniidae are a fossil family of actinistian fish popularly known as coelacanths, which are found in continental and marine paleoenvironments. The taxon is considered monophyletic, including five valid genera (Axelrodichthys, Chinlea,Diplurus, Mawsonia andParnaibaia) and 11 genera with some taxonomical controversy (Alcoveria, Changxingia,Garnbergia, Heptanema,Indocoelacanthus, Libys,Lualabaea, Megalocoelacanthus,Moenkopia, Rhipis andTrachymetopon). The genera restricted to the Northern Hemisphere (Diplurus and Chinlea) possess the oldest records (Late Triassic), whereas those found in the Southern Hemisphere (Mawsonia, Axelrodichthys, andParnaibaia) extend from Late Jurassic to Late Cretaceous, especially in Brazil and Africa. We identified...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mawsoniidae; Mesozoic; Evolutionary biogeography; Track analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100159

On two pterosaur humeri from the Tendaguru beds (Upper Jurassic, Tanzania)
Provedor de dados: 42
Autores: Costa,Fabiana R.; Kellner,Alexander W.A.
Jurassic African pterosaur remains are exceptionally rare and only known from the Tendaguru deposits, Upper Jurassic, Tanzania. Here we describe two right humeri of Tendaguru pterosaurs from the Humboldt University of Berlin: specimens MB.R. 2828 (cast MN 6661-V) and MB.R. 2833 (cast MN 6666-V). MB.R. 2828 consists of a three-dimensionally preserved proximal portion. The combination of the morphological features of the deltopectoral crest not observed in other pterosaurs suggests that this specimen belongs to a new dsungaripteroid taxon. MB.R. 2833 is nearly complete, and because of a long and round proximally placed deltopectoral crest it could be referred to the Archaeopterodactyloidea. It is the smallest pterosaur from Africa and one of the smallest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tendaguru; Tanzania; Africa; Upper Jurassic; Pterosauria.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400017

Lefschetz-Pontrjagin duality for differential characters
Provedor de dados: 42
Autores: HARVEY,REESE; LAWSON,BLAINE.
A theory of differential characters is developed for manifolds with boundary. This is done from both the Cheeger-Simons and the deRham-Federer viewpoints. The central result of the paper is the formulation and proof of a Lefschetz-Pontrjagin Duality Theorem, which asserts that the pairing &lt;img src="http:/img/fbpe/aabc/v73n2/fo1.gif" alt="fo1.gif (867 bytes)"&gt; given by (alpha, beta) &lt;img SRC="http:/img/fbpe/aabc/v73n2/m1img7.gif"&gt; (alpha * beta) [X] induces isomorphisms &lt;img src="http:/img/fbpe/aabc/v73n2/fo2.gif" alt="fo2.gif (1110 bytes)"&gt; &lt;img src="http:/img/fbpe/aabc/v73n2/fo3.gif" alt="fo3.gif (1086 bytes)"&gt; onto the smooth Pontrjagin duals. In particular, &lt;img SRC="http:/img/fbpe/aabc/v73n2/m1img13.gif"&gt; and &lt;img...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Differential characters; Lefschetz duality; DeRham theory.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200001

Plant-pollinator interactions in Crambe abyssinicaHochst. (Brassicaceae) associated with environmental variables
Provedor de dados: 42
Autores: Simioni,Lívia C.; Mussury,Rosilda M.; Mauad,Munir; Dresh,Daiane M.; Pereira,Fabricio F.; Scalon,Silvana P.Q.
Despite the economic importance of Crambe abyssinica, the present study is the first report on bees that occur with this species, and could aid in developing alternative methods for controlling insect pests without seriously impacting pollinators. The present study examined the following questions: (1) Which species are potential pollinators of C. abyssinica? (2) How do environmental conditions influence pollinator visitation fluctuations? Insects were sampled on a weekly basis between 08:00 and 16:00 during five weeks of flowering. When the results of analyses of variance were significant, the data was adjusted using regression equations at a 5% level of probability; the environmental variables were examined using Pearson's correlation coefficient. Apis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiesel; Crambe; Associated insects; Oleaginous; Pollination.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100137

Effect of Carbon dioxide (CO2) on mortality and reproduction of Anagasta kuehniella (Zeller 1879), in mass rearing, aiming at the production of Trichogramma spp.
Provedor de dados: 42
Autores: COELHO JUNIOR,ALOISIO; PARRA,JOSE R.P.
Eggs of Anagasta kuehniella (Zeller 1879) are widely used for mass rearing of Trichogramma spp. and other parasitoids and predators, largely commercialized in many countries. The aim of this study is to evaluate the effect of carbon dioxide (CO2) originated from larval metabolism on the biological parameters of A. kuehniella. For that purpose, we assess the production of carbon dioxide (CO2) per rearing tray of A. kuehniella and the effect of CO2 on the viability of egg-to-adult period and oviposition of A. kuehniella. Results allow to estimate that a rearing tray, containing 10,000 larvae between the 4th and 5th instars, produces an average of 30.67 mL of CO2 per hour. The highest egg production of A. kuehniella was obtained when the larvae were kept in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mass rearing; Factitious host; Abiotic factor; Carbon dioxide.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200823

Rocinela signata (Isopoda: Aegidae) parasitizing the gills of the spotted goatfish Pseudupeneus maculatus (Actinopterygii: Mullidae) in Northeastern Brazil
Provedor de dados: 42
Autores: CARDOSO,LUCAS; MARTINS,MAURÍCIO L.; GOLZIO,JÉSSICA E.S. DE AQUÍNO; BOMFIM,CAROLINA N.C.; OLIVEIRA,RICARDO L.M. DE; SANTOS,LEILANE B.G. DOS; LACERDA,ANA CAROLINA F.
ABSTRACT Parasitic isopods of fishes usually show wide distribution and low host specificity. This study investigated the occurrence of gill parasites in 120 specimens of spotted goatfish Pseudupeneus maculatus, marine fish of great economic importance for fishery community. The fish were captured monthly in the Coast of Pernambuco State, Northeast Brazil, between October 2012 and September 2013. Eleven isopods were found and identified as Rocinela signata. We observed lower infections in the gills of P. maculatus (prevalence 8.3%, mean intensity 1.6±0.3 and mean abundance 0.1±0.3) when compared to other studies of different host fishes from geographically close locations. This parasite has been reported from a wide variety of fish species, not only in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coast of Pernambuco; Crustacean; Marine fish; Parasitism.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502075

Monazite ID-TIMS U-Pb geochronology in the LAGIR laboratory, Rio de Janeiro State University: protocols and first applications to the assembly of Gondwana supercontinent in SE-Brazil
Provedor de dados: 42
Autores: C.A. NETO,CARLA; VALERIANO,CLAUDIO M.; PASSARELLI,CLAUDIA R.; HEILBRON,MONICA; LOBATO,MARCELA.
The chemical and spectrometric procedures of the U-Pb geochronology method on monazites, recently installed in the LAGIR laboratory, are described in detail. In addition, preliminary results on monazite samples from the Brasília and Ribeira belts are reported and discussed in the context of the regional geology. Several experiments for calibration of ion exchange chromatographic columns with the AG-1x8 resin, were performed with HCl, using dissolved natural monazite samples. The Pb blanks of reagents are ∼0.5 pg/g in acids and ∼1 pg/g in H2O. The total Pb blanks in chemical procedures were below 22 pg. Preliminary results are presented from three case studies related to Brasiliano orogenic belts of SE-Brazil, which correlate very well with previous age...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gondwana; Brasiliano; Isotope dilution mass spectrometry; U-Pb; Monazite.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100171

Dynamics of solar radiation and soybean yield in agroforestry systems
Provedor de dados: 42
Autores: CARON,BRAULIO O.; SGARBOSSA,JAQUELINE; SCHWERZ,FELIPE; ELLI,ELVIS F.; ELOY,ELDER; BEHLING,ALEXANDRE.
Abstract Soybean (Glycine max L.) monocropping have had a great socio-economic and environmental impact on the world and agroforestry systems has been considered an alternative for more sustainable production. The aim of this study was to evaluate the effect of different arrangements of agroforestry systems of the species E. urophylla x E. grandis and P. dubium and the pruning of the trees on the dynamics of solar radiation and soybean yield. A field experiment was conducted in Southern Brazil. In order to achieve the objective of the study, the solar radiation transmissivity and the productive performance of the soybean were evaluated. In this study, the soybean yield was determined by the arrangement of the agroforestry system and forest species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop systems; Solar radiation transmissivity; Sustainable production; Tree pruning; Yield traits.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703799

The southern Araçuaí belt and the Dom Silvério Group: geologic architecture and tectonic significance
Provedor de dados: 42
Autores: Peres,Guilherme G.; Alkimim,Fernando F.; Jordt-Evangelista,Hanna.
The Araçuaí belt corresponds to the external portion of the western half of the Araçuaí-West Congo Neopro-terozoic orogen. TheAraçuaí belt fringes the São Francisco craton to east and is separated from the crystalline core of the orogen by the Abre Campo geophysical discontinuity. The southern Araçuaí belt involves four major lithologic units: the Archean and Paleoproterozoic gneisses of the Mantiqueira Complex, the Pedra Dourada Charnockite, the Paleoproterozoic Borrachudos Granitoid, and the metavolcanosedimentary rocks of the Dom Silvério Group. The Dom Silvério Group occurs in a NNE-SSW striking belt and consists of a thick package of metapelitic rocks with intercalations of quartzites, amphibolites, meta-ultramafics, banded iron formations, gondites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araçuaí-West Congo orogen; Araçuaí belt; Dom Silvério Group; Brasiliano event.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400011

Growth and biochemical composition of Chlorella vulgaris in different growth media
Provedor de dados: 42
Autores: CHIA,MATHIAS A.; LOMBARDI,ANA T.; MELãO,MARIA DA GRAÇA G.
The need for clean and low-cost algae production demands for investigations on algal physiological response under different growth conditions. In this research, we investigated the growth, biomass production and biochemical composition of Chlorella vulgaris using semi-continuous cultures employing three growth media (LC Oligo, Chu 10 and WC media). The highest cell density was obtained in LC Oligo, while the lowest in Chu medium. Chlorophyll a, carbohydrate and protein concentrations and yield were highest in Chu and LC Oligo media. Lipid class analysis showed that hydrocarbons (HC), sterol esthers (SE), free fatty acids (FFA), aliphatic alcohols (ALC), acetone mobile polar lipids (AMPL) and phospholipids (PL) concentrations and yields were highest in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrates; Lipid class; Microalgae; Proteins.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401427

Mentha pulegium crude extracts induce thiol oxidation and potentiate hemolysis when associated to t-butyl hydroperoxide in human’s erythrocytes
Provedor de dados: 42
Autores: BIANCHINI,MATHEUS C.; GALVÃO,DENNYURA O.; TAMBORENA,TATIANA; ALVES,CLAUDIA O.; PUNTEL,ROBSON L.
ABSTRACT Mentha pulegium (Lamiaceae) tea has been used as a traditional medicine; however, the modulatory effect of M. pulegium extracts on damage to human erythrocytes associated to t-butyl hydroperoxide (t-BHP) exposure remains to be investigated. Accordingly, we perform this study in order to test the hypothesis that aqueous and ethanolic extracts of M. pulegium could modulate the hemolysis associated to t-BHP exposure, non-protein thiol (NPSH) oxidation and lipid peroxidation (measured as thiobarbituric acid reactive substances - TBARS) in human erythrocytes. Samples were co-incubated with t-BHP (4 mmol/L) and/or aqueous or ethanolic extracts (10-1000 mg/mL) during 120 min to further analysis. We found that both extracts, when associated to t-BHP,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mentha pulegium; Lamiaceae; Hemolysis; Lipid peroxidation; NPSH oxidation; Erythrocytes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602901

Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil
Provedor de dados: 42
Autores: Magalhães,André; Leite,Natália da R.; Silva,João G.S.; Pereira,Luci C.C.; Costa,Rauquírio M. da.
The main purpose of this study was to investigate the seasonal variation of copepod community structure during the months of July, September and November 2003 (dry season) and January, March and May 2004 (rainy season) in the Curuçá estuary, northern Brazil. Samples were collected during neap tides via gentle 200µm mesh net tows from a small powerboat. Measurements of surface water conductivity were accomplished in situ using an electronic conductivimeter and salinity was later obtained through the transformation of the conductivity values. Salinity varied seasonally from 7.2 ± 0.1 to 39.2 ± 1.8 (mean ± standard deviation) and was influenced mainly by differences in the amount of rainfall between the studied sampling seasons. In total, 30 Copepoda taxa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copepod; Salinity; Ecological indexes; Seasonal changes; Brazil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200005

In vivo assessment of cyto/genotoxic, antigenotoxic and antifungal potential of Costus spiralis (Jacq.) Roscoe leaves and stems
Provedor de dados: 42
Autores: SOUSA,WENDEL C. DE; T.S. PAZ,ANDRESSA; ROCHA,JAMIRA D.; CONCEIÇÃO,EDEMILSON C. DA; ALMEIDA,LUCIANE M. DE; CHEN,LEE C.; BORGES,LEONARDO L.; BAILÃO,ELISA F.L.C.
ABSTRACT Costus spiralis is a Brazilian native plant used in popular medicine, but the safety of this therapeutic use needs investigation. So, the aim of this study was to evaluate the cytogenotoxic and antigenotoxic effects of C. spiralis leaves or stems aqueous extracts on Allium cepa root cells. Moreover, a phytochemical screening and an antioxidant and antifungal activities evaluation were performed. C. spiralis aqueous extracts presented cytotoxicity, but no mutagenicity was observed. When the antigenotoxicity was evaluated, C. spiralis leaves aqueous extract presented preventive and modulatory effects on A. cepa root cells, reducing the sodium azide cytogenotoxic effects. In contrast, C. spiralis stems aqueous extract enhanced the sodium azide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa test; Antioxidant; Medicinal plant; Secondary metabolites.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401565

The lizard cerebral cortex as a model to study neuronal regeneration
Provedor de dados: 42
Autores: LOPEZ-GARCIA,CARLOS; MOLOWNY,ASUNCION; NACHER,JUAN; PONSODA,XAVIER; SANCHO-BIELSA,FRANCISCO; ALONSO-LLOSA,GREGORI.
The medial cerebral cortex of lizards, an area homologous to the hippocampal fascia dentata, shows delayed postnatal neurogenesis, i.e., cells in the medial cortex ependyma proliferate and give rise to immature neurons, which migrate to the cell layer. There, recruited neurons differentiate and give rise to zinc containing axons directed to the rest of cortical areas, thus resulting in a continuous growth of the medial cortex and its zinc-enriched axonal projection. This happens along the lizard life span, even in adult lizards, thus allowing one of their most important characteristics: neuronal regeneration. Experiments in our laboratory have shown that chemical lesion of the medial cortex (affecting up to 95% of its neurons) results in a cascade of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medial cortex; Hippocampus; Postnatal neurogenesis; Neural stem cells; Zinc; Regeneration.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100006

Geo-environmental zoning using physiographic compartmentalization: a proposal for supporting sustainable decision-making
Provedor de dados: 42
Autores: CORRÊA,CLAUDIA V.S.; REIS,FÁBIO A.G.V.; GIORDANO,LUCILIA C.; BRESSANE,ADRIANO; CHAVES,CAMILA J.; AMARAL,ANA MARIA C. DO; BRITO,HERMES D.; MEDEIROS,GERSON A. DE.
ABSTRACT The geo-environmental zoning represents an important strategy in the territorial management. However, it requires a logical and structured procedure. Therefore, an approach using physiographic compartmentalization is proposed and applied as case study in a region covered by the topographic maps of São José dos Campos and Jacareí, Brazil. This region has great geological and geomorphological peculiarities, beyond being a place with large human interventions because of its quickly economic growth. The methodology is based on photointerpretation techniques and remote sensing in GIS environment. As a result, seven geo-environmental zones were obtained from a weighted integration by multicriteria analysis of physiographic units with land-use classes....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Decision-support; Earth sciences; Land use.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401503

Daily and seasonal activity patterns of free range South-American rattlesnake (Crotalus durissus)
Provedor de dados: 42
Autores: TOZETTI,ALEXANDRO M.; MARTINS,MARCIO.
This study aimed at describing daily and seasonal variation in the activity of a population of South-American rattlesnakes (Crotalus durissus) in a savanna like habitat (Cerrado) in Southeastern Brazil. Seasonal and daily activities of snakes were evaluated by the number of captures of snakes during road surveys, accidental encounters, and relocations by radio-tracking. Our results show that climatic variables such as air temperature and rainfall have little influence on the activity pattern of rattlesnakes. Our findings indicate that rattlesnakes spend most of the day resting and most of the night in ambush posture. The South-American rattlesnake is active throughout the year with a discrete peak in activity of males during the matting season. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Ethology; Squamata; Radio-track.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301047

Mapping of sites in forest stands
Provedor de dados: 42
Autores: NETTO,SYLVIO PÉLLICO; STEFANELLO,FLAVIO R.; PELISSARI,ALLAN L.; DAVID,HASSAN C.
Generally, the forest companies use the total one year planting area as a minimum stratum of the total population and, consequently, the forest inventory processing has been conducted by applying the stratified random sampling to it. This study was carried out in the National Forest of Tres Barras, Brazil, and it aimed to classify and map the sites of Pinus elliottii stands. A systematic sampling was structured into clusters and applied independently by compartments. The clusters, in maltese cross, were composed of four sampling subunits, using Prodan sampling method with a fixed number of six trees. By analysis of the methodology it was possible to confirm the hypothesis: a) the selective thinning cause expressive increase of volumetric variability within...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pinus elliottii; Prodan's sampling method stratification by sites spatial variation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402025

Reproductive aspects of the semi-aquatic snake Erythrolamprus miliaris (Dipsadidae: Xenodontini) in the state of Rio de Janeiro, southeastern Brazil
Provedor de dados: 42
Autores: EISFELD,ALEXIA; VRCIBRADIC,DAVOR.
Abstract: We analyzed some aspects of reproduction and sexual dimorphism of the semi-aquatic dipsadid snake Erythrolamprus miliaris in the state of Rio de Janeiro, southeastern Brazil. We detected sexual dimorphism in body size (snout-vent length), with females averaging larger than males, but no sexual dimorphism in the relative length of the tail. Oviductal eggs and secondary follicles were found in all seasons, suggesting that female reproductive cycles are continuous, in spite of the tropical seasonal climate in the region. Reproductive males were present throughout the year, suggesting a continuous cycle for males as well. Clutch size averaged 10.3 ± 4.8 (range 4-21) and there was a positive and significant relationship between clutch size and female...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Reproduction; Sexual dimorphism; Squamata.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100632

A fast algorithm for computing the Hartley/ Fourier spectrum
Provedor de dados: 42
Autores: OLIVEIRA,HELIO M. DE; SOUZA,RICARDO M. C. DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300025

Arctic East Siberia had a lower latitude in the Pleistocene
Provedor de dados: 42
Autores: Woelfli,Willy; Baltensperger,Walter.
Remains of mammoths in Arctic East Siberia, where there is not sufficient sunlight over the year for the growth of the plants on which these animals feed, indicate that the latitude of this region was lower before the end of the Pleistocene than now. Reconstructing this geographic pole shift, we introduce a massive object, which moved in an extremely eccentric orbit and was hot from tidal work and solar radiation. Evaporation produced a disk-shaped cloud of ions around the Sun. This cloud partially shielded the solar radiation, producing the cold and warm periods characterizing the Pleistocene. The shielding depends on the inclination of Earth's orbit, which has a period of 100. 000 years. The cloud builds up to a point where inelastic particle collisions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ice age; Pole shift; Interplanetary cloud; Mass extinction.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200001

Antioxidant, analgesic and anti-inflammatory effects of lavender essential oil
Provedor de dados: 42
Autores: SILVA,GABRIELA L. DA; LUFT,CAROLINA; LUNARDELLI,ADROALDO; AMARAL,ROBSON H.; MELO,DENIZAR A. DA SILVA; DONADIO,MÁRCIO V.F.; NUNES,FERNANDA B.; AZAMBUJA,MARCOS S. DE; SANTANA,JOÃO C.; MORAES,CRISTINA M.B.; MELLO,RICARDO O.; CASSEL,EDUARDO; PEREIRA,MARCOS AURÉLIO DE ALMEIDA; OLIVEIRA,JARBAS R. DE.
Several studies have investigated the antinociceptive, immunomodulatory and anti-inflammatory properties of compounds found in the lavender essential oil (LEO), however to date, there is still lack of substantial data. The objective of this study was to assess the antioxidant, anti-inflammatory and antinociceptive effects of lavender essential oil. The 1,1-diphenyl-2-picrylhydrazyl radical decolorization assay was used for antioxidant activity evaluation. The anti-inflammatory activity was tested using two models of acute inflammation: carrageenan-induced pleurisy and croton oil-induced ear edema. The antinociceptive activity was tested using the pain model induced by formalin. LEO has antioxidant activity, which is dose-dependent response. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Inflammation; Lavender; Nociception.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301397

Is Forced Swimming Immobility a Good Endpoint for Modeling Negative Symptoms of Schizophrenia? - Study of Sub-Anesthetic Ketamine Repeated Administration Effects
Provedor de dados: 42
Autores: NEVES,GILDA; BORSOI,MILENE; ANTONIO,CAMILA B.; PRANKE,MARIANA A.; BETTI,ANDRESA H.; RATES,STELA M.K.
ABSTRACT Immobility time in the forced swimming has been described as analogous to emotional blunting or apathy and has been used for characterizing schizophrenia animal models. Several clinical studies support the use of NMDA receptor antagonists to model schizophrenia in rodents. Some works describe the effects of ketamine on immobility behavior but there is variability in the experimental design used leading to controversial results. In this study, we evaluated the effects of repeated administration of ketamine sub-anesthetic doses in forced swimming, locomotion in response to novelty and novel object recognition, aiming a broader evaluation of the usefulness of this experimental approach for modeling schizophrenia in mice. Ketamine (30 mg/kg/day i.p....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antidepressant-like effect; Immobility behavior; Locomotor activity; Memory negative symptoms.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401655

Setting boundaries: Environmental and spatial effects on Odonata larvae distribution (Insecta)
Provedor de dados: 42
Autores: Mendes,Thiago P.; Cabette,Helena S. R.; Juen,Leandro.
Environmental characteristics and spatial distances between sites have been used to explain species distribution in the environment, through Neutral (space) and Niche theory (environment) predictions. We evaluated the effects of spatial and environmental factors on Odonata larvae distribution along the Suiá-Missú River Basin, state of Mato Grosso. We tested the hypotheses that (1) the environment is the main factor structuring the community due to its ecophysiological requirements; and (2) the pattern, if present, is clearer for Zygoptera. Samples were made in 12 sites on the Suiá-Missú River Basin in three seasons (2007/2008), with a total of 1.382 Odonata larvae, comprising 10 families, 51 genera and 100 morphospecies. The Anisoptera were more abundant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anisoptera; Zygoptera; Neutral theory; Niche theory; Transition Cerrado-Amazon.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100239

Ultrastructural studies on the sporogenous tissue and anther wall of Leucojum aestivum (amaryllidaceae) in different developmental stages
Provedor de dados: 42
Autores: Ekici,Nuran; Dane,Feruzan.
In this study, ultrastructures of anther wall and sporogenous tissue of Leucojum aestivum were investigated during different developmental stages. Cytomictic channels were seen between pollen mother cells during prophase I. Polar distribution was described in the organelle content of pollen mother cells and microspores in early phases of microsporogenesis and also in pollen mitosis. Active secretion was observed in tapetal cells. Previous reports about developmental stages of male gametophyte were compared with the results of this study.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leucojum aestivum; Amaryllidaceae; Ultrastructure; Sporogenous tissue; Anther wall.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400010

Larvicidal activity of the water extract of Moringa oleifera seeds against Aedes aegypti and its toxicity upon laboratory animals
Provedor de dados: 42
Autores: Ferreira,Paulo M.P.; Carvalho,Ana F.U.; Farias,Davi F.; Cariolano,Nara G.; Melo,Vânia M.M.; Queiroz,Maria G.R.; Martins,Alice M.C.; Machado-Neto,Joaquim G.
In this work, biological effects of the water extract of Moringa oleifera seeds (WEMOS) were assessed on eggs and 3rd instar larvae of Aedes aegypti and on its toxicity upon laboratory animals (Daphnia magna, mice and rats). Crude WEMOS showed a LC50 value of 1260µg/mL, causing 99.2 ± 2.9% larvae mortality within 24 h at 5200µg/mL, though this larvicidal activity has been lost completely at 80ºC/10 min. WEMOS did not demonstrate capacity to prevent egg hatching. After extensive dialyses of the crude WEMOS into watersoluble dialyzable (DF) and nondyalizable (NDF) fractions, only DF maintained its efficacy to kill larvae. Acute toxicity evaluations on daphnids (EC50 of 188.7µg/mL) and mice (LD50 of 446.5 mg/kg body weight) pointed out to low toxicity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Daphnia magna; Larvicidal activity; Moringa oleifera seeds; Toxicity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200007

The study of biotic interactions in the Brazilian Cerrado as a path to the conservation of biodiversity
Provedor de dados: 42
Autores: DEL-CLARO,KLEBER; TOREZAN-SILINGARDI,HELENA MAURA.
Abstract: As a focus for conservation efforts, biodiversity has received increased attention in the last fifty years. Searching for patterns in biodiversity, researchers have suggested studies including: ecological communities, cladistics classifications, hierarchical compositions of different levels of organization, and groups of taxonomically related species. Here, we propose that the study of the biodiversity of interactions may present a new perspective in the efforts to conserve biodiversity, especially in endangered ecosystems like the tropical savannas. We suggest that Cerrado, like other tropical savannas, is a particularly important ecosystem in which we can direct efforts to explain what determines the major part of variation in the outcomes of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ant-plant interactions; Ecosystem; Tropical savanna; Veredas.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600614

Chemical composition, antioxidant and antibacterial activities of essential oils from leaves and flowers of Eugenia klotzschiana Berg (Myrtaceae)
Provedor de dados: 42
Autores: CARNEIRO,NÁRGELLA S.; ALVES,CASSIA C.F.; ALVES,JOSÉ M.; EGEA,MARIANA B.; MARTINS,CARLOS H.G.; SILVA,THAYNÁ S.; BRETANHA,LIZANDRA C.; BALLESTE,MAIRA P.; MICKE,GUSTAVO A.; SILVEIRA,EDUARDO V.; MIRANDA,MAYKER L.D.
ABSTRACT Many essential oils (EOs) of different plant species possess interesting antimicrobial effects on buccal bacteria and antioxidant properties. Eugenia klotzschiana Berg (pêra-do-cerrado, in Portuguese) is a species of Myrtaceae with restricted distribution in the Cerrado. The essential oils were extracted through the hydrodistillation technique using a modified Clevenger apparatus (2 hours) and chemically characterized by GC-MS. The major compounds were α-copaene (10.6 %) found in oil from leaves in natura, β-bisabolene (17.4 %) in the essential oil from dry leaves and α-(E)-bergamotene (29.9 %) in oil from flowers. The antioxidant activity of essential oils showed similarities in both methods under analysis (DPPH and ABTS˙+) and the results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant activity; Antibacterial activity; Brazilian pear; Drying; Eugenia klotzschiana; Sesquiterpenes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401907

Anesthetic activity and bio-guided fractionation of the essential oil of Aloysia gratissima (Gillies &amp;amp; Hook.) Tronc. in silver catfish Rhamdia quelen
Provedor de dados: 42
Autores: BENOVIT,SIMONE C.; SILVA,LENISE L.; SALBEGO,JOSEÂNIA; LORO,VANIA L.; MALLMANN,CARLOS A.; BALDISSEROTTO,BERNARDO; FLORES,ERICO M.M.; HEINZMANN,BERTA M.
This work aimed to determine the efficacy of the essential oil of A. gratissima as anesthetic for silver catfish, and to perform the bio-guided fractionation of essential oil aiming to isolate compounds responsible for the noted effects. Fish were submitted to anesthesia bath with essential oil, its fractions and isolated compounds to determine time of anesthetic induction and recovery. Eugenol (50 mg L-1) was used as positive control. Essential oil of A. gratissima was effective as an anesthetic at concentrations of 300 to 900 mg L-1. Fish presented involuntary muscle contractions during induction and recovery. The bio-guided fractionation of essential oil furnishedE-(-)-pinocamphone, (-)-caryophyllene oxide, (-)-guaiol and (+)-spathulenol....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthesia (-)-caryophyllene oxide E-(-)-pinocamphone (-)-guaiol; Silver catfish (+)-spathulenol.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401675

Natural sound archives: past, present and future
Provedor de dados: 42
Autores: Ranft,Richard.
Recordings of wild animals were first made in the Palearctic in 1900, in the Nearctic in 1929, in Antarctica in 1934, in Asia in 1937, and in the Neotropics in the 1940s. However, systematic collecting did not begin until the 1950s. Collections of animal sound recordings serve many uses in education, entertainment, science and nature conservation. In recent years, technological developments have transformed the ways in which sounds can be sampled, stored and accessed. Now the largest collections between them hold altogether around 0.5 million recordings with their associated data. The functioning of a major archive will be described with reference to the British Library Sound Archive. Preserving large collections for the long term is a primary concern in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sound archives; Bioacoustic libraries; Audio recording; Digitization.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200041

Facies, 3rd order sequence stratigraphy and hydrologic potential of sandstones, Mafra Formation (late Paleozoic), Paraná Basin, Brazil
Provedor de dados: 42
Autores: PICOLO,CONRADO E.B.; CANUTO,JOSÉ R.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300028

Impact of percentage and particle size of sugarcane biochar on the sorption behavior of clomazone in Red Latosol
Provedor de dados: 42
Autores: SILVA,MARCOS R.F. DA; QUEIROZ,MARIA ELIANA L.R. DE; NEVES,ANTÔNIO A.; SILVA,ANTÔNIO A. DA; OLIVEIRA,ANDRÉ F. DE; OLIVEIRA,RENAN L. DE; AZEVEDO,MARIANE M.
Abstract Biochar is a carbonaceous material that has excellent potential as a fertilizer and soil conditioner. However, there is a lack of information concerning the effects of the amount and particle size of this pyrogenic material on the soil sorption capacity. In this work, evaluation was made of changes in clomazone (CMZ) sorption in a Red Latosol following soil conditioning using different percentages (0.25, 0.5, and 1% w/w) of sugarcane biochar in three particle sizes (&lt;106, 106-508, and 508-610 µm). The conditioned soils presented apparent sorption coefficients (Kd) up to 1300 times higher than that of pure soil, besides changes in the behavior of CMZ sorption. The biochar particle size and percentage influenced sorption of the herbicide as well...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apparent sorption coefficient; Batch experiment; External surface area; Factorial design; Freundlich isotherm; Herbicide retention.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703745

Is arbuscular mycorrhizal fungal species community affected by cotton growth management systems in the Brazilian Cerrado?
Provedor de dados: 42
Autores: NUNES,HELIAB B.; GOTO,BRUNO T.; COIMBRA,JOÃO LUIZ; OLIVEIRA,JAMILE S.; TAVARES,DÉRICA G.; ROCHA,MARCELO S.; SILVA,FABIANE L.; SOARES,ANA CRISTINA F.
Abstract: Conventional cotton production in western Bahia, Brazil, involves intensive use of agricultural inputs and mechanization, which may affect arbuscular mycorrhizal fungi (AMF). This work aimed at studying the impact of conventional and organic cotton production in the AMF of western Bahia. Soil samples were obtained from conventional white cotton and colored cotton organic production systems as well as from native Cerrado areas, close to the white cotton fields, and from the subcaducifolia vegetation, close to the organic colored cotton farms. The most frequent species in the conventional farming areas belonged to the genera Acaulospora (10 spp.); Glomus (8 spp.); Dentiscutata (3 spp.); Ambispora, Pacispora and Scutellospora (2 spp. each), as well...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycorrhiza; BRS Safira cotton variety; BRS 336 variety; Glomeromycota.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700858

On reduced L2 cohomology of hypersurfaces in spheres with finite total curvature
Provedor de dados: 42
Autores: ZHU,PENG.
Abstract In this paper, we prove that the dimension of the second space of reduced L2 cohomology of M is finite if is a complete noncompact hypersurface in a sphere &amp;#55349;&amp;#56650;n+1and has finite total curvature (n≥3).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Total curvature; Reduced L2 cohomology; Hypersurface in sphere; L2 harmonic 2-form.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602053

Analysis of whistles produced by the Tucuxi Dolphin Sotalia fluviatilis from Sepetiba Bay, Brazil
Provedor de dados: 42
Autores: Erber,Claudia; Simão,Sheila M.
From July 2001 to June 2002, we recorded a total of 2h55min of Tucuxi Dolphin Sotalia fluviatilis vocalizations from Sepetiba Bay, Brazil (22º35'S-44º03'W). A total of 3350 whistles were analyzed quantitative and qualitatively and were divided into 124 types, by visual inspection of sonograms. The following parameters were measured: Initial Frequency, Final Frequency, Minimum Frequency, Maximum Frequency, Duration, Number of Inflections, Frequency at the Inflection Points, Frequency at 1/2, 1/4, and 3/4 of whistle duration, Presence of Frequency Modulation and Harmonics. Ascending type whistles (N=2719) were most common, representing 82% of the total. Dolphin behavior and average group size observed during recording influenced the whistle's quantitative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sotalia fluviatilis; Cetacea; Delphinidea; Vocal repertoire; Whistles; Behavior.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200029

Surveillance programs for detection and characterization of emergent pathogens and antimicrobial resistance: results from the Division of Infectious Diseases, UNIFESP
Provedor de dados: 42
Autores: Colombo,Arnaldo L.; Janini,Mario; Salomão,Reinaldo; Medeiros,Eduardo A. S.; Wey,Sergio B.; Pignatari,Antonio C. C.
Several epidemiological changes have occurred in the pattern of nosocomial and community acquired infectious diseases during the past 25 years. Social and demographic changes possibly related to this phenomenon include a rapid population growth, the increase in urban migration and movement across international borders by tourists and immigrants, alterations in the habitats of animals and arthropods that transmit disease, as well as the raise of patients with impaired host defense abilities. Continuous surveillance programs of emergent pathogens and antimicrobial resistance are warranted for detecting in real time new pathogens, as well as to characterize molecular mechanisms of resistance. In order to become more effective, surveillance programs of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emerging infectious diseases; HIV; AIDS; Candidemia; Antimicrobial resistance; Bacteremia; Sepsis; Nosocomial infectious.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300020

Solvent-related chronic toxic encephalopathy as a target in the worker's mental health research
Provedor de dados: 42
Autores: Ramos,Andréia; Jardim,Silvia R.; Silva Filho,João F.
The article is aimed at discussing the theoretical grounds which support the diagnosis of solvent-related chronic encephalopathy in the field of the worker's mental health, having it as a target in this area. The psychiatric, neurological and labor health postulates which contribute to the multidisciplinary description of such diagnostic category are presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solvents; Chronic encephalopathy; Diagnostic criteria; The worker's mental health.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400010

Leaf and inflorescence axis anatomy of Brazilian species of Rapateoideae (Rapateaceae, Poales)
Provedor de dados: 42
Autores: Daltin,Ângela L.; Oriani,Aline; Scatena,Vera L.
The anatomy of leaves and inflorescence axes of Spathanthus (2 spp.), Rapatea (2 spp.), Cephalostemon(1 sp.), and Duckea(1 sp.) (Rapateoideae, Rapateaceae) was studied to identify useful characters for taxonomy. The cross-section shape of inflorescence axis differentiates the genera, while the cross-section shape and structure of leaf midrib has a specific value. The following characteristics are exclusive of Spathanthus: silica cells randomly distributed in the leaf epidermis; plicate chlorenchyma in the leaf blade; presence of fiber bundles in the mesophyll and in the inflorescence axis parenchyma. Spathanthus is also distinguished by the number, type and distribution of vascular bundles in the inflorescence axis. The genus Rapatea is characterized by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Cephalostemon; Duckea; Poales; Rapatea; Rapateaceae; Spathanthus.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100157

Bioacoustic investigations and taxonomic considerations on the Cicadetta montana species complex (Homoptera: Cicadoidea: Tibicinidae)
Provedor de dados: 42
Autores: Gogala,Matija; Trilar,Tomi.
Recent bioacoustic investigations have shown that Cicadetta montana Scopoli 1772 is a complex of morphologically similar sister species that are best characterized by their song patterns. At the type locality of C. montana, only mountain cicadas with simple, long lasting song phrases were heard, recorded and collected. Therefore, we have good reasons to suggest that this type of song is characteristic for C. montana s. str. Boulard described a song of C. montana from France with phrases composed of a long and a short echeme; this type of song is characteristic for cicadas morphologically corresponding to C. montana var. brevipennis Fieber 1876; we suggest to raise this taxon to species level. On the basis of specific song, Puissant and Boulard described C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cicadetta montana; Cicadetta spp.; Cicadas; Bioacoustics; Systematics.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200020

Cross-disciplinary approaches for measuring parasitic helminth viability and phenotype
Provedor de dados: 42
Autores: Peak,Emily; Hoffmann,Karl F.
Parasitic worms (helminths) within the Phyla Nematoda and Platyhelminthes are responsible for some of the most debilitating and chronic infectious diseases of human and animal populations across the globe. As no subunit vaccine for any parasitic helminth is close to being developed, the frontline strategy for intervention is administration of therapeutic, anthelmintic drugs. Worryingly, and unsurprising due to co-evolutionary mechanisms, many of these worms are developing resistance to the limited compound classes currently being used. This unfortunate reality has led to a renaissance in next generation anthelmintic discovery within both academic and industrial sectors. However, a major bottleneck in this process is the lack of quantitative methods for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helminth; Schistosome; Nematode; Viability; Phenotype.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200024

Diametric Growth of Tree Species in the Atlantic Forest, Paraná, Brazil
Provedor de dados: 42
Autores: SOUZA,RONAN F.; MACHADO,SEBASTIÃO A.; LONGHI-SANTOS,TOMAZ.
Abstract: Management of remnants in Atlantic Forest is an alternative for their conservation, however, information on the growth and ecology of those species is lacking. This study aimed to describe diametric growth of Balfourodendron riedelianum, Cordia trichotoma and Ocotea diospyrifolia based on its growth rings and to verify the relationship between this growth with the environmental characteristics in different altitude levels and forest types. Diametric growth was higher for the largest tree diameters of the three species. Based on the fitted growth model, the age in which mean annual increment in diameter becomes greater than the current annual increment was 55 years for B. riedelianum (DBH = 18.27 cm), 45 years for C. trichotoma (DBH = 26.56 cm)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendrochronology; Altitude levels; Forest types; Forest management; Forest ecology; Iguaçu National Park.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700855

Adenosine as a signaling molecule in the retina: biochemical and developmental aspects
Provedor de dados: 42
Autores: PAES-DE-CARVALHO,ROBERTO.
The nucleoside adenosine plays an important role as a neurotransmitter or neuromodulator in the central nervous system, including the retina. In the present paper we review compelling evidence showing that adenosine is a signaling molecule in the developing retina. In the chick retina, adenosine transporters are present since early stages of development before the appearance of adenosine A1 receptors modulating dopamine-dependent adenylate cyclase activity or A2 receptors that directly activate the enzyme. Experiments using retinal cell cultures revealed that adenosine is taken up by specific cell populations that when stimulated by depolarization or neurotransmitters such as dopamine or glutamate, release the nucleoside through calcium-dependent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nucleoside; Receptors and transporters; Development; Cell culture; Uptake and release.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300007

A potent larvicidal agent against Aedes aegypti mosquito from cardanol
Provedor de dados: 42
Autores: PAIVA,DERISVALDO R.; LIMA,DÊNIS P. DE; AVVARI,NAGA P.; ARRUDA,EDUARDO J. DE; CABRINI,ISAIAS; MARQUES,MARIA RITA; SANTOS,EDSON A. DOS; BIAGGIO,FRANCISCO C.; SANGI,DIEGO P.; BEATRIZ,ADILSON.
ABSTRACT Cardanol is a constituent of Cashew Nut Shell Liquid that presents larvicidal activity against Aedes aegypti. The isolation of cardanol is somewhat troublesome, however, in this work we describe an efficient and inexpensive method to obtain it as a pure material. The compound was used as starting material to make chemical transformation leading to saturated cardanol, epoxides and, halohydrins. These derivatives were tested for toxicity against Aedes aegypti larvae. The results showed that iodohydrins are very promising compounds for making commercial products to combat the vector mosquito larvae presenting a LC50 of 0.0023 ppm after 72 h of exposure.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Insecticide; Larvicide; Phenolic lipids; CNSL.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200373

A note on the occurrence of praniza larvae of Gnathiidae (Crustacea, Isopoda) on fishes from Northeast of Pará, Brazil
Provedor de dados: 42
Autores: Diniz,Daniel G.; Varella,Jamille E.A.; Guimarães,Maria Danielle F.; Santos,Arthur F.L.; Fujimoto,Rodrigo Y.; Monfort,Karla C.F.; Pires,Marcus A.B.; Martins,Maurício L.; Eiras,Jorge C.
The infection of the estuarine teleost fishes Mugil gaimardianus Desmarest, 1831 (Mugilidae), Arius phrygiatus Valenciennes, 1839 (Ariidae), Conodon nobilis Linnaeus, 1759 (Haemulidae), Cetengraulis edentulus Cuvier, 1829 (Engraulidae), and Anableps anableps Linnaeus, 1758 (Anablepidae) by praniza larvae of Gnathiidae (Crustacea, Isopoda) was studied in specimens fished off the Atlantic Ocean in Northeast of Pará State, near Bragança, Brazil. The highest infection prevalence value was found in Anableps anableps (42.3%) and the lowest in Conodon nobilis (9.1%). The mean intensity varied from 1 parasitein Conodon nobilis to 19.5 in Arius phrygiatus. A description of the larvae is provided. The morphology of the mouthparts is related to the blood sucking...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Parasites; Isopoda; Gnathiidae; Brazil.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400007

Sandy beaches: state of the art of nematode ecology
Provedor de dados: 42
Autores: MARIA,TATIANA F.; VANAVERBEKE,JAN; VANREUSEL,ANN; ESTEVES,ANDRÉ M.
ABSTRACT In this review, we summarize existing knowledge of the ecology of sandy-beach nematodes, in relation to spatial distribution, food webs, pollution and climate change. We attempt to discuss spatial scale patterns (macro-, meso- and microscale) according to their degree of importance in structuring sandy-beach nematode assemblages. This review will provide a substantial background on current knowledge of sandy-beach nematodes, and can be used as a starting point to delineate further investigations in this field. Over decades, sandy beaches have been the scene of studies focusing on community and population ecology, both related to morphodynamic models. The combination of physical factors (e.g. grain size, tidal exposure) and biological interactions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Benthos; Distribution patterns; Food webs; Climatic changes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501635

Green speciation of iron using aqueous two-phase system
Provedor de dados: 42
Autores: CAMPOS,RAQUEL A.; PATRÍCIO,PAMELA R.; VARGAS,SILVIA JULIANA R.; SILVA,LUIS HENRIQUE M. DA; HESPANHOL,MARIA C.
Abstract Fe(II) and Fe(III) have distinct chemical and biological functions. Consequently, it is more important to determine the fraction of both oxidation state that knowing the total iron concentration in a sample. However, green methods for iron speciation are still limited. This work uses aqueous two-phase system, a safe alternative to liquid–liquid extraction, to perform the chemical speciation of iron. This method is based on the reaction of Fe(II) with 1,10-phenanthroline extractant, forming a complex of Fe(II)-phenanthroline that concentrates in the top phase of the system. The Fe(III) specie concentrated in the bottom phase of the system. Iron speciation was affected by the electrolyte nature, macromolecule type, quantity of phenanthroline added,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous two-phase system; Flame atomic absorption spectrometry; Iron; Speciation; Green chemistry.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929

Isoetes pedersenii, a new species from Southern South America
Provedor de dados: 42
Autores: Macluf,Cecilia; Meza Torres,Esteban I.; Solís,Stella M.
The name Isoetes pedersenii H.P. Fuchs (Lycophyta), a species known only from the Mburucuyá National Park, Corrientes, Argentina, is validated. Observations were carried out on herbarium material with stereoscopic, light and scanning electron microscopes. The species is described and typified. A diagnosis and discussion about its distribution and its relationship with the morphology of other species of Isoetes are provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Corrientes; Isoetes; Lycophyta; New species.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200011

Composition of functional ecological guilds of the fish fauna of the internal sector of the Amazon Estuary, Pará, Brazil
Provedor de dados: 42
Autores: MOURÃO,KEILA R.M.; FERREIRA,VALDIMERE; LUCENA-FRÉDOU,FLÁVIA.
The present study describes the spatial and temporal structure of the estuarine fish community in the internal sector of the Amazon Estuary. Samples were obtained in the main channels and tidal creeks of Guajará and Marajó Bays and Guamá River. A total of 41,516 fish specimens were collected, representing 136 taxa, 38 families and 12 orders. In the dry season, the mean salinity of the main channel increased along a limnic-marine gradient, between the Guamá River and the Marajó Bay. Species richness was lowest in the mouth of the Guamá River and in the right margin of the Guajará Bay. Fish species composition and environmental guilds differed markedly among areas: Migrants and Freshwater Stragglers were dominant in the Guamá River and the Guajará Bay, while...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuaries; Fish diversity; Functional ecology; Habitat; Salinity gradients.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401783

Petrography and mineral chemistry of carbonatites and mica-rich rocks from the Araxá complex (Alto Paranaíba Province, Brazil)
Provedor de dados: 42
Autores: TRAVERSA,GIANBOSCO; GOMES,CELSO B.; BROTZU,PIERO; BURAGLINI,NICOLETTA; MORBIDELLI,LUCIO; PRINCIPATO,MARIA SPERANZA; RONCA,SARA; RUBERTI,EXCELSO.
The Araxá complex (16 km²) comprises carbonatites forming a central core and a complex network of concentric and radial dykes as well as small veins; additionally, it includes mica-rich rocks, phoscorites and lamprophyres. Fenites also occur and are represented by Proterozoic quartzites and schists of the Araxá Group. The petrographic study of 130 borehole samples indicates that the complex is basically made up by two rock-types, carbonatites and mica-rich rocks, and subordinately by a third unit of hybrid composition. Carbonatites range chemically in composition, the most abundant type being magnesiocarbonatites. Dolomite and calcite correspond to the chief constituents, but other carbonate phases, including the Ce-group RE minerals, are also recognized....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkaline rocks; Carbonatites; Geochemistry.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100008

Cytogenotoxicity of Cymbopogon citratus (DC) Stapf (lemon grass) aqueous extracts in vegetal test systems
Provedor de dados: 42
Autores: Sousa,Saulo M.; Silva,Pâmela S.; Viccini,Lyderson F.
The lemon grass, Cymbopogon citratus (DC) Stapf, is an important species of Poaceae family commonly used in the folk medicine in many countries. The aim of this study was to investigate the cytotoxic and genotoxic effects of aqueous extracts from C. citratus leaves on Lactuca sativa (lettuce) root tip meristem cells by cytogenetic studies that have never been done before for lemon grass extracts. For this, lettuce seeds were treated for 72h with different concentrations of lemon grass aqueous extracts (5; 10; 20 and 30 mg/mL). The percentage of germination, root development and cellular behavior were analyzed, and the results showed that the highest concentration of aqueous extracts reduced the mitotic index, the seed germination and the root development...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous extract; Cybopogon citratus; Cytotoxic effect; Genotoxic effect; Lactuca sativa.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200006

The cytoskeleton of the electric tissue of Electrophorus electricus, L.
Provedor de dados: 42
Autores: MERMELSTEIN,CLAUDIA DOS SANTOS; COSTA,MANOEL LUIS; MOURA NETO,VIVALDO.
The electric eel Electrophorus electricus is a fresh water teleost showing an electrogenic tissue that produces electric discharges. This electrogenic tissue is distributed in three well-defined electric organs which may be found symmetrically along both sides of the eel. These electric organs develop from muscle and exhibit several biochemical properties and morphological features of the muscle sarcolema. This review examines the contribution of the cytoskeletal meshwork to the maintenance of the polarized organization of the electrocyte, the cell that contains all electric properties of each electric organ. The cytoskeletal filaments display an important role in the establishment and maintenance of the highly specialized membrane model system of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrophorus electricus; Cytoskeleton; Desmin; Actin; Alpha-actinin; Vinculin.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300008

Hypoglycemic property of triterpenoid saponin PFS isolated from Polyscias fruticosa leaves
Provedor de dados: 42
Autores: LUYEN,NGUYEN THI; DANG,NGUYEN HAI; BINH,PHUNG THI XUAN; HAI,NGUYEN THI; DAT,NGUYEN TIEN.
Abstract This paper evaluated the inhibitory effect of 3-O-[β-d-glucopyranosyl-(1→4)-β-d-glucuronopyranosyl] oleanolic acid 28-O-β-d-glucopyranosyl ester (PFS), a major saponin isolated from Polyscias fruticosa leaves, on α-amylase and α-glucosidase, and its potential for reducing the postprandial blood glucose level in mice. In enzyme inhibition assays, PFS strongly inhibited porcine pancreas α-amylase and yeast α-glucosidase. Using the Lineweaver–Burk equation, we found that PFS inhibited porcine pancreas α-amylase in a mixed noncompetitive mode, and yeast α-glucosidase via noncompetitive inhibition. In the sucrose tolerance test, PFS at 100 mg/kg body weight significantly decreased the postprandial blood glucose level in mice fed a high-sucrose diet....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyscias fruticosa; Araliaceae; Α-amylase; Α-glucosidase; Hypoglycemia.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602881

Evaluation of cell proliferation and endometrial thickness of bitches in different periods of diestrus
Provedor de dados: 42
Autores: GOSSLER,VANESSA S.A.; SANTOS,FRANCISLAINE A.G.; AZEVEDO,ALINE R. DE; GONÇALVES,PRISCILA C.; RIGOLO,HUGO A.; TREVISAN,CLEONICE; MASSENO,ANA PAULA B.; CARDOSO,ANA PAULA M.M.; PAPA,PAULA C.; CASTILHO,CALIÊ; GIOMETTI,INES C.
ABSTRACT This study aimed to determine the histological features of the endometrium of bitches, as well as the cell proliferation at specific moments of diestrus, 10, 20, 30, 40, 50 and 60 days post ovulation, correlating the endometrial thickness with the uterine cell proliferation and the metabolic state (weight, blood glucose and plasma cholesterol) of the animals. Therefore, the right and left uterine horns of 26 clinically healthy bitches submitted to ovariohysterectomy were histologically analyzed 10, 20, 30, 40, 50 and 60 days post ovulation. The hematoxylin-eosin and AgNOR staining techniques were performed. All parameters were evaluated by ANOVA and post-hoc Tukey test (p&lt;0.05). The correlation between endometrial thickness and uterine cell...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AgNOR; Dogs; Hematoxylin-eosin; Uterus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401719

Moduli space of special Lagrangians in almost Kahler spaces
Provedor de dados: 42
Autores: MA,LI.
In this work we extend the McLean theorem about the moduli space of special Lagrangian submanifolds in Calabi-Yau (CY) manifolds to almost complex manifolds, which are near to the given CY manifold.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moduli space; Special Lagrangians.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100001

Spatial variability of tree species diversity in a mixed tropical forest in Southern Brazil
Provedor de dados: 42
Autores: PELISSARI,ALLAN L.; F FILHO,AFONSO; EBLING,ANGELO A.; SANQUETTA,CARLOS R.; CYSNEIROS,VINICIUS C.; CORTE,ANA PAULA D.
Abstract Floristic surveys and diversity indices are often applied to measure tree species diversity in mixed tropical forest remnants. However, these analyses are frequently limited to the overall results and do not allow to evaluate the spatial variability distributions of tree diversity, leading to develop additional tools. This study aimed to estimate the spatial variability of tree diversity and map their spatial patterns in a Brazilian mixed tropical forest conservation area. We used indices to measure the tree species diversity (dbh ≥ 10 cm) in 400 sampling units (25 m x 25 m) from a continuous forest inventory. Semivariograms were fitted to estimate spatial dependences and punctual kriging was applied to compose maps. Mean diversity values were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustilofia; Atlantic Forest biome; Diversity indices; Geostatistics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502491

Cricket singing means rain: semiotic meaning of insects in the district of Pedra Branca, Bahia State, northeastern Brazil
Provedor de dados: 42
Autores: Costa Neto,Eraldo M.
This paper deals with the semiotic meanings which are given both to the appearance and/or behavior of insect species according to the ethnoentomological knowledge of the inhabitants of the village of Pedra Branca, Bahia State, Brazil. Data were collected from February to May 2001 by performing open-ended, recorded interviews with nine men and twenty-five women, whose ages ranged from 19 to 82 years old. Data were analyzed by using the union model, which involves considering all available information on the surveyed subject. Twelve kinds of insects were associated with both beneficial and harmful events, as well as with the indication of changing weather. The way local people perceive and interpret the appearance and/or behavior of certain species of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindicator; Ethnoentomology; Folk knowledge; Semiotic meaning.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100007

Signal transduction in Plasmodium-Red Blood Cells interactions and in cytoadherence
Provedor de dados: 42
Autores: Cruz,Laura N.; Wu,Yang; Craig,Alister G.; Garcia,Célia R.S.
Malaria is responsible for more than 1.5 million deaths each year, especially among children (Snow et al. 2005). Despite of the severity of malaria situation and great effort to the development of new drug targets (Yuan et al. 2011) there is still a relative low investment toward antimalarial drugs. Briefly there are targets classes of antimalarial drugs currently being tested including: kinases, proteases, ion channel of GPCR, nuclear receptor, among others (Gamo et al. 2010). Here we review malaria signal transduction pathways in Red Blood Cells (RBC) as well as infected RBCs and endothelial cells interactions, namely cytoadherence. The last process is thought to play an important role in the pathogenesis of severe malaria. The molecules displayed on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytoadherence; Erythrocyte; Malaria; Plasmodium; Signal transduction.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200024

Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
Provedor de dados: 42
Autores: Bezerra,Marcos A.; Souza,Antônio D.S.; Oliveira,Rafael V.; Oliveira,Djalma M.; Cardoso,Luiz A.M.; Sousa Filho,Hélio R.
This work proposes the use of photo-oxidation degradation with UV radiation/H2O2 as sample treatment for the determination of Fe, Zn, Mn, Ni and Co in municipal solid waste landfill leachate by flame atomic absorption spectrometry (FAAS). Three variables (pH, irradiation time and buffer concentration) were optimized using Doehlert design and the proportions of mixture components submitted to UV radiation (leachate sample, buffer solution and H2O2 30%, v/v) were optimized using a constrained mixture design. Using the experimental conditions established, this procedure allows limits of detection of 0.075, 0.025, 0.010, 0.075 and 0.041 µg mL-1, and the precision levels expressed as relative standard (%RSD, 0.5 µg mL-1) were 3.6, 1.8, 1.3, 3.3 and 1.7%, for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landfill leachate; Photo-oxidation decomposition; UV radiation; Metal determination; FAAS.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100002

Genetic diversity and nonparametric statistics to identify possible ISSR marker association with fiber quality of pineapple
Provedor de dados: 42
Autores: SILVA,JULIANNA M.; LIMA,PAULO R.L.; SOUZA,FERNANDA V.D.; LEDO,CARLOS A.S.; SOUZA,EVERTON H.; PESTANA,KATIA N.; FERREIRA,CLÁUDIA F.
Abstract: Due to the increasing search for renewable resources, plant fibers have become an alternative when creating new products. Studies demonstrate the potential use of pineapple fibers in composites. The objective of this work was to evaluate the genetic diversity and verify any association between ISSR (Inter Simple Sequence Repeats) bands and quality of pineapple fibers for use in cements in the civil construction. The study analyzed the genetic variability of 11 pineapple genotypes, as well as the possible association of 131 bands from 16 ISSR markers with fiber quality characteristics. Eleven bands were selected based on their high correlations (0.64578* to 0.72457*) with three fiber quality variables. Of these, two bands were purified, sequenced,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus (L.) Merr.; Civil construction; Genetic diversity; DNA markers; Nonparametric statistics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500862

Antioxidant activity of oils extracted from orange (Citrus sinensis) seeds
Provedor de dados: 42
Autores: Jorge,Neuza; Silva,Ana Carolina da; Aranha,Caroline P.M.
Due to the increasing production of food in the world with consequent increase of the production of waste, the importance of developing researches for its use is noticed. Thus, the interest in vegetable oils with bioactive compounds, such as the ones extracted from fruit seeds, is growing. Therefore, the present study aims to characterize the oils extracted from seeds of Hamlin, Natal, Pera-rio and Valencia orange varieties (Citrus sinensis), as to the levels of total carotenoids, total phenolic compounds, tocopherols and phytosterols, as well as to determine their antioxidant activity. The orange seed oils presented important content of total carotenoids (19.01 mg/kg), total phenolic compounds (4.43 g/kg), α-tocopherol (135.65 mg/kg) and phytosterols...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agro-industrial waste; Phytosterols; Tocopherols; Vegetable oils.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300951

First record of Dichelyne (Dichelyne) bonacii (Nematoda, Cucullanidae) parasitizing the intestine of two species of lutjanid fish (Perciformes, Lutjanidae) on the northeast Brazilian coast
Provedor de dados: 42
Autores: ALVES,ANDRÉ M.; CALASSANS,TAÍSSA A.S.; FREIRE,JANAÍNA F.; SOUZA,GEZA T.R. E; TAKEMOTO,RICARDO M.; MELO,CLAUDIA M. DE; JERALDO,VERÓNICA L.S.; MADI,RUBENS R.
Abstract: Lutjanids are marine fish and commonly inhabit coral reefs, which have migratory habits and feed in a general way, due to these characteristics, are susceptible to infections by parasites, such as cuculanid nematodes. This work aimed to report for the first time, the occurrence of Dichelyne (Dichelyne) bonacii in Brazil, in two new hosts, Lutjanus analis and Rhomboplites aurorubens, acquired from local artisanal fishermen at the Aracaju city public fishing terminal (10 ° 54’17 “S37 ° 2’56” W), northeast coast of Brazil. Adult nematodes were collected from the intestinal tract of the hosts, clarified in Aman’s Lactophenol and were briefly described here. Three adult males and five gravid females were found, indicating that the two species of fish...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brasil; Cucullanidae; Lutjanus; Nematoda.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700620

Chemical constituents of Piptadenia gonoacantha (Mart.) J.F. Macbr (pau jacaré)
Provedor de dados: 42
Autores: Carvalho,Mário G. de; Cardozo,Maritza A.R.; Catunda Junior,Francisco E.A.; Carvalho,Acácio G. de.
The phytochemical investigation of Piptadenia gonoacantha (Mart.) J.F. Macbr. (Leguminosae-Mimosoideae), commonly known as "pau jacaré" (alligator stick), afforded sitosterol, campesterol, stigmasterol, the N-benzoylphenylalanine-2-benzoylamide-3-phenylpropyl ester, known as asperphenamate, sitosterol-3-O-β-D-glucopyranoside, besides three flavonoids, apigenin, 5-O-methylapigenin and 7,4'-dihydroxy-3',5-dimethoxyflavone from its branches. From its leaves, the methyl gallate and two flavonoids, vitexin and isovitexin, were isolated. From its bark, a mixture of sitosterol, campesterol, and stigmasterol, besides a mixture of cycloartenone, cycloartan-25-en-3-one, and 24-methylene-cycloartenone, and the pure triterpenes 24-methylenecycloartanol, friedelin,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leguminoseae; Piptadenia gonoacantha; Terpenoids; Asperphenamate; Flavonoids; "pau jacaré"; Piptadenia gonoacantha.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300003

Diet of the chola guitarfish, Rhinobatos percellens (Rhinobatidae), in the Paranaguá Estuarine complex
Provedor de dados: 42
Autores: Carmo,Wanessa P.D. do; Bornatowski,Hugo; Oliveira,Elton C.; Fávaro,Luís L.
The chola guitarfish, Rhinobatos percellens, is one of the most-captured batoids on the Brazilian coast, and an important predator of benthic community. Stomachs from R. percellens were sampled in the Paranaguá estuarine complex (March/2006 to March/2007 and October/2008 to September/2009). The stomachs obtained were used for describing the diet of R. percellens, and verifying if there are seasonal and ontogenetic differences in their feeding into the estuarine area. The general analysis showed a specialized diet with a predominance of three species in food contents: Leptochela serratorbita, Caridea remains and Ogyrides alphaerostris. Ontogenetic and seasonal analysis did not reveal significant differences in the food consumption. These data reveal that R....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranchii; Rhinobatidae; Diet; Especialist; Caridea; Estuary.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200721

Water retention curve to analyze soil structure changes due to liming
Provedor de dados: 42
Autores: FERREIRA,TALITA R.; PIRES,LUIZ F.; AULER,ANDRÉ C.; BRINATTI,ANDRÉ M.; OGUNWOLE,JOSHUA O.
Abstract: Liming can influence crop growth by altering pore geometry, pore size distribution and water retention characteristics in acid soils. The aim of this work is to determine liming effects on the soil structure based on analysis of water retention data using a cubic spline adjustment function. For that, the authors investigated the effect of three lime rates (0, 15 and 20 t ha-1) on soil water retention characteristics and pore size distribution of a silty-clay “Cambissolo Háplico Alumínico” (Dystrudept) located in the SE region of the Paraná State, Brazil. Soil cores were collected after 31 months of the experiment at 0-10 cm and 10-20 cm soil layers. Eleven matric potentials (from 0 to -7000 cm H2O) were employed to calculate soil water retention...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water retention; Pore size distribution; Soil porosity; Acid soils.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500852

The neurotoxic effects of vitamin A and retinoids
Provedor de dados: 42
Autores: OLIVEIRA,MARCOS ROBERTO DE.
Vitamin A (retinol) and its congeners - the retinoids - participate in a panoply of biological events, as for instance cell differentiation, proliferation, survival, and death, necessary to maintain tissue homeostasis. Furthermore, such molecules may be applied as therapeutic agents in the case of some diseases, including dermatological disturbances, immunodeficiency, and cancer (mainly leukemia). In spite of this, there is a growing body of evidences showing that vitamin A doses exceeding the nutritional requirements may lead to negative consequences, including bioenergetics state dysfunction, redox impairment, altered cellular signaling, and cell death or proliferation, depending on the cell type. Neurotoxicity has long been demonstrated as a possible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitochondrial dysfunction; Neurotoxicity; Oxidative stress; Retinoids; Vitamin A.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301361

Community structure of metazoan parasites in Hemibrycon surinamensis (Characidae) from the Matapi River in the State of Amapá, Brazil
Provedor de dados: 42
Autores: SOUSA,BRIANI O.; OLIVEIRA,MARCOS S.B.; MARCOS,TAVARES-DIAS.
Abstract Abstract: The aim of this study was to investigate the community of metazoan parasites in Hemibrycon surinamensis from the Matapi River, State of Amapá, Brazil. Among the 31 examined fish, 77.4 % were parasitized by Jainus hexops, Tereancistrum ornatus (Monogenea), Contracaecum sp. (Nematoda), Clinostomus marginatum and Posthodiplostomum sp. (Digenea). However, the dominance was of monogeneans J. hexops and T. ornatus, and among the endoparasites, the predominance was of species at the larval stage. The parasites showed random dispersion. Brillouin diversity index varied from 0 to 0.9, evenness from 0 to 0.7 and species richness from 0 to 3 parasites per host. Low levels of parasitic infection were observed and discussed. The results indicate that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ectoparasites; Freshwater fish; Diversity; Monogeneans.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300614

New records of the rare Troschel’s Pampas Snake, Phimophis guianensis (Serpentes: Dipsadidae) in Brazil
Provedor de dados: 42
Autores: ENTIAUSPE-NETO,OMAR M.; AZEVEDO,WEVERTON S.; PEREIRA,VALQUIRIA O.; ABEGG,ARTHUR D.; ROCHA,ANDERSON M.; LOEBMANN,DANIEL.
Abstract The Troschel’s Pampas Snake, Phimophis guianensis (Troschel, 1848), is widely distributed in Amazonian Savannas at northern South America and a small portion of southern Central America, being recorded to Brazil based on three historical records, that ranged from 1997 to 2002, in Amapá and Pará states. In this study, we revise all known records of P. guianensis, providing an updated distribution map, and the first record to Roraima state.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian Savannah; Roraima; Distribution gap; Squamata; Pseudoboini.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603023

Use of GC/MS to identify chemical constituents and cytotoxic activity of the leaves of Phoradendron mucronatum and Phoradendron microphyllum (Viscaceae)
Provedor de dados: 42
Autores: BASTOS,ISLA V.G.A.; OLIVEIRA,TATIANE B. DE; RODRIGUES,MARIA D.; MILITÃO,GARDÊNIA C.G.; SILVA,TERESINHA G. DA; TURATTI,IZABEL C.C.; LOPES,NORBERTO P.; MELO,SEBASTIÃO J. DE.
ABSTRACT Phoradendron mucronatum and P. microphyllum are plants that found in tropical and subtropical areas, used in traditional medicine and popularly known as mistle-thrush. The aim of this study was to identify the chemical constituents of different leaf extracts from P. mucronatum and P. microphyllum and assess cytotoxic activity against strains from a human tumour cells. Extracts obtained with hexane, dichloromethane, chloroform and ethyl acetate from the leaves were analysed by gas chromatography coupled with mass spectrometry (GC-MS) and the cytotoxicity was assessed by the MTT method (bromide (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide)). The tested human tumour cells were NCI-H292 (human pulmonar mucoepidermoid carcinoma), MCF-7...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Gas Chromatography; Phoradendron microphyllum; Phoradendron mucronatum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300991

Soil aggregation and carbon stabilization in burn and no-burn sugarcane management systems
Provedor de dados: 42
Autores: GUIMARÃES,MARIA DE FÁTIMA; OLIVEIRA,JOSÉ F. DE; TELLES,TIAGO S.; MACHADO,WALQUÍRIA; BARBOSA,GRAZIELA M.C.; TAVARES FILHO,JOÃO.
ABSTRACT Retaining sugarcane straw over the soil after harvesting can improve soil structure and increase soil carbon stabilization, mainly in macroaggregates. We evaluated the carbon content in the aggregate classes in areas under burn and no-burn (adopted for five years) sugarcane management systems, focusing on the superficial layer (0.00-0.20 m). The experiment was carried in an Oxisol and the treatments consisted in burnt sugarcane, manual harvest; burnt sugarcane, mechanized harvest; and no-burn, mechanized harvest. The retention of sugarcane straw on the soil surface is justified by the increase in carbon content and carbon stock in the surface layer (0.00-0.20 m) by restructuring of the soil, even though it cannot match the structure of the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane straw; Soil aggregates; Carbon stock; Sand fraction; Soil structure.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502459

Supramolecular effects in dendritic systems containing photoactive groups
Provedor de dados: 42
Autores: AZZELLINI,GIANLUCA CAMILLO.
In this article are described dendritic structures containing photoactive groups at the surface or in the core. The observed supramolecular effects can be attributed to the nature of the photoactive group and their location in the dendritic architecture. The peripheric azobenzene groups in these dendrimeric compounds can be regarded as single residues that retain the spectroscopic and photochemical properties of free azobenzene moiety. The E and Z forms of higher generation dendrimer, functionalized with azobenzene groups, show different host ability towards eosin dye, suggesting the possibility of using such dendrimer in photocontrolled host-guest systems. The photophysical properties of many dendritic-bipyridine ruthenium complexes have been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Supramolecular Photochemistry; Dendrimers; Azobenzene; Ruthenium Complexes.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100004

In vitro cytotoxic, antifungal, trypanocidal and leishmanicidal activities of acetogenins isolated from Annona cornifolia A. St. -Hil. (Annonaceae)
Provedor de dados: 42
Autores: LIMA,LUCIANA A.R.S.; ALVES,TÂNIA M.A.; ZANI,CARLOS L.; SALES JÚNIOR,POLICARPO A.; ROMANHA,ALVARO J.; JOHANN,SUSANA; CISALPINO,PATRÍCIA S.; PIMENTA,LÚCIA P.S.; BOAVENTURA,MARIA AMÉLIA D.
Annona cornifolia A. St. -Hil. is a small annual perennial tree found in the Brazilian savannah; their green fruit is popularly used in the treatment of ulcers. The acetogenins isolated from the seeds of Annona cornifolia previously showed to possess antioxidant activity. In continuation of our investigations on the biological activities of acetogenins, four binary mixtures and ten pure adjacent bis-tetrahydrofuran annonaceous acetogenins were evaluated: the cytotoxic (against three human tumor cell lines), antifungal (against Paracoccidioides brasiliensis), trypanocidal (against Trypanosoma cruzi) and leishmanicidal (against Leishmania amazonensis) activities. Acetogenins presented cytotoxic activity confirming their potential use in anti-cancer therapy....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona cornifolia; Acetogenins; Cytotoxic; Antifungal; Trypanocidal; Leishmanicidal.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200829

Pantanal Wetland rivers and lakes water level monitoring using Topex-Poseidon satellite altimetry: preliminary results
Provedor de dados: 42
Autores: Mattos,Elaine Medeiros de; Ussami,Naomi.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200016

Geochemistry and mineralogy of recent sediments of Guanabara Bay (NE sector) and its major rivers - Rio de Janeiro State - Brazil
Provedor de dados: 42
Autores: FARIA,MARCIA DE MELO; SANCHEZ,BRAZ A.
Geochemical and clay mineralogical studies of bottom sediments collected along the Macacu and Caceribu rivers and Guanabara Bay were carried out in order to investigate the relationship between major source areas and recent sediments of the bay. Clay mineralogy includes different groups with selective distribution conditioned by geomorphic features and depositional settings. Micaceous clay minerals are abundant near parent rock in the upper course, whereas kaolinite derived from varied sources is gradually concentrated towards the estuary. In the Guanabara Bay, kaolinite accumulates near river mouths, while micaceous clay minerals are converted into mixed layers in the estuary. Analyses of heavy metal contents reveal higher levels of Zn and Cu in sediments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metal; Clay mineral; Sediment; Guanabara Bay.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100010

C-, Sr-isotope stratigraphy of carbonate rocks from the Southern Espinhaço Ridge, Minas Gerais, southeastern Brazil
Provedor de dados: 42
Autores: FRAGA,LUCIO M.S.; NEVES,SORAYA C.; UHLEIN,ALEXANDRE; SIAL,ALCIDES N.; PIMENTEL,MARCIO M.; HORN,ADOLF H.
Neoproterozoic carbonate rocks comprise different stratigraphic units in the southern part of the Espinhaço Ridge, Minas Gerais, Brazil. C, O- and Sr-isotope analyses were carried out along four selected stratigraphic sections across these formations. These are: (i) the Rio Pardo Grande Formation in the upper portion of the Espinhaço Supergroup, sampled in section 3; (ii) Macaúbas Group laminated limestones (Tijucuçu Farm) and dolostone layers (Domingas Formation) have been respectively sampled along the so-called sections 1 and 2, and (iii) the lower stratigraphic units of the Bambuí Group, sampled in section 4. Laminated limestone samples from the Macaúbas Group have δ13C values as high as 10.9‰ decreasing up section to -1.1‰ and 87Sr/86Sr values vary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sr isotopes; C isotopes; Carbonates; Macaúbas Group; Bambuí Group; Marinoan glaciation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200633

The challenge of the reference and counter-reference system in the prenatal assistance to pregnant women with infectious diseases
Provedor de dados: 42
Autores: Figueiredo,Elisabeth N.; Vianna,Lucila A. C.; Peixe,Marina B.; Ramos,Valdete M.; Succi,Regina C. M.
The objective of this study was to determine the prevalence of infectious diseases, such as syphilis, acquired immune deficiency syndrome (AIDS) and hepatitis B and C, in pregnant women who undertook their prenatal care in thirteen basic health units (BHU) in São Paulo city. The efficiency of the reference and counter-reference system in such prenatal infectious diseases was evaluated considering the medical recordings of the final result of the pregnancy and the vertical transmission rates of these diseases. It consists of an epidemiologic study whose observations were based on the notes of the prenatal medical and nurse records of pregnant women who had infectious diseases susceptible to vertical transmission and final infectious status registers of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Congenital syphilis; Hepatitis B; Hepatitis C; HIV; Prenatal care; Referral and consultation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300018

Extraction and characterization of lipids from Sarcocornia ambigua meal: a halophyte biomass produced with shrimp farm effluent irrigation
Provedor de dados: 42
Autores: COSTA,CÉSAR S.B.; VICENTI,JULIANO R.M.; MORÓN-VILLARREYES,JOAQUÍN A.; CALDAS,SERGIANE; CARDOSO,LIZIANE V.; FREITAS,RICARDO F.; D'OCA,MARCELO G.M.
Sarcocornia ambigua is a perennial glasswort, native of South America and a potential new seed-oil crop and forage for direct irrigation with salt water. Small seeds develop inside fertile segments of its cylindrical leafless shoots and, at the harvest, seeds are typically mixed with remnant cellulose material difficult to separate. This work evaluated different extraction methods and the composition of total esterified fatty acids in a meal of ground fertile shoots of S. ambigua, seeking for an alternative primary matter and larger yield of total lipids. The highest lipid yield was obtained with a chloroform:methanol mixture (2:1)(v/v) (5.2% of dry weight). The most abundant polyunsaturated fatty acids in the meal were linoleic acid (C18:2; 21.4%) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipids; Long chain fatty acids; Palmitic acid; Polar solvent; Ω6 acid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200935

Macrophages as target cells for Mayaro virus infection: involvement of reactive oxygen species in the inflammatory response during virus replication
Provedor de dados: 42
Autores: CAVALHEIRO,MARIANA G.; COSTA,LEANDRO SILVA DA; CAMPOS,HOLMES S.; ALVES,LETÍCIA S.; ASSUNÇÃO-MIRANDA,IRANAIA; POIAN,ANDREA T. DA.
ABSTRACT Alphaviruses among the viruses that cause arthritis, consisting in a public health problem worldwide by causing localized outbreaks, as well as large epidemics in humans. Interestingly, while the Old World alphaviruses are arthritogenic, the New World alphaviruses cause encephalitis. One exception is Mayaro virus (MAYV), which circulates exclusively in South America but causes arthralgia and is phylogenetically related to the Old World alphaviruses. Although MAYV-induced arthritis in humans is well documented, the molecular and cellular factors that contribute to its pathogenesis are completely unknown. In this study, we demonstrated for the first time that macrophages, key players in arthritis development, are target cells for MAYV infection,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alphaviruses; Mayaro virus; Macrophage activation; Reactive oxygen species; Viral arthritis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401485

Contribution to the stratigraphy of the onshore Paraíba Basin, Brazil
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.; Bezerra,Francisco H.R.; Valeriano,Márcio M.; Brito-Neves,Benjamim B.; Ochoa,Felipe L.
Several publications have contributed to improve the stratigraphy of the Paraíba Basin in northeastern Brazil. However, the characterization and distribution of sedimentary units in onshore areas of this basin are still incomplete, despite their significance for reconstructing the tectono-sedimentary evolution of the South American passive margin. This work provides new information to differentiate among lithologically similar strata, otherwise entirely unrelated in time. This approach included morphological, sedimentological and stratigraphic descriptions based on surface and sub-surface data integrated with remote sensing, optically stimulated luminescence dating, U+Th/He dating of weathered goethite, and heavy mineral analysis. Based on this study, it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphology; Sedimentology; Stratigraphy; Chronology; Tectonics; Paraíba Basin.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200007

Supramolecular ionics: electric charge partition within polymers and other non-conducting solids
Provedor de dados: 42
Autores: GALEMBECK,FERNANDO; COSTA,CARLOS A. R.; GALEMBECK,ANDRÉ; SILVA,MARIA DO CARMO V. M.
Electrostatic phenomena in insulators have been known for the past four centuries, but many related questions are still unanswered, for instance: which are the charge-bearing species in an electrified organic polymer, how are the charges spatially distributed and which is the contribution of the electrically charged domains to the overall polymer properties? New scanning probe microscopies were recently introduced, and these are suitable for the mapping of electric potentials across a solid sample thus providing some answers for the previous questions. In this work, we report results obtained with two of these techniques: scanning electric potential (SEPM) and electric force microscopy (EFM). These results were associated to images acquired by using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrostatics of solids; Electric charge excess; Scanning electric potential microscopy; Electric force microscopy; Polymer electrostatic behavior.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400003

Upper Pleistocene deposits of the Comprida Island (São Paulo State) dated by thermoluminescence method
Provedor de dados: 42
Autores: SUGUIO,KENITIRO; TATUMI,SONIA H.; KOWATA,EMÍLIA A.; MUNITA,CASIMIRO S.; PAIVA,ROSEMEIRE P.
The Cananéia (Upper Pleistocene) and the Comprida Island (Holocene) formations, outcropping in the Comprida island (SP) have been mapped using geomorphological and lithological criteria. Only one sample of the Cananéia Formation, collected in the homonymous island in front of the Comprida Island, was beyond the limit of the standard radiocarbon method. But since the publication of the geological map of the area in 1978, there has been some doubt on the real occurrence of Pleistocene deposits in southern extremity of Comprida Island. This paper deals with the results of thermoluminescence (TL) ages of eight samples from Comprida Island, which corroborate the Pleistocene age assumed during mapping surveys of these deposits. On the other hand, possible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermoluminescence ages; Pleistocene; Sea level; São Paulo State.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100010

Plasma miR-1273g-3p acts as a potential biomarker for early Breast Ductal Cancer diagnosis
Provedor de dados: 42
Autores: Guo,Huan; Zeng,Xiangting; Li,Haining; Guo,Yanxiang; Wang,Tao; Guo,Hongyun; Zhu,Gongjian; Wang,Lan; Zhou,Haihong; Liu,Kedan; Chen,Xiaoyi; Wang,Haitao; Zhao,Xinke; Su,Haixiang; Li,Yingdong.
Abstract  Circulating miRNAs presenting in plasma in a stable manner have been demonstrated their potential role as a promising biomarkers in many human diseases, such as Alzheimer’s disease, melanoma and ovarian carcinoma. However, few circulating miRNAs could be used for breast ductal cancer diagnosis. Here, we identified miR-1273g-3p as a biomarker for detecting breast ductal cancer. We detected miR-1273g-3p levels in the plasma of 39 sporadic breast ductal cancer patients and 40 healthy donors by Stem-loop Quantitative Real-time PCR (qRT-PCR). The results showed the plasma miR-1273g-3p level were significantly up-regulated in breast ductal cancer patients compared with healthy donors (p=0.0139). Receiver operating characteristic (ROC) curve also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breast ductal carcinoma; Plasma; MiR-1273g-3p; Circulating miRNA; Biomarker.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100801

Weathering Resistance of Waterborne Polyurethane Coatings Reinforced with Silica from Rice Husk Ash
Provedor de dados: 42
Autores: MONTEIRO,WESLEY F.; MIRANDA,GABRIELA M.; SOARES,RAFAEL R.; SANTOS,CLÁUDIA A.B. DOS; HOFFMANN,MAURÍCIO S.; CARONE,CARLOS L.P.; LIMA,VIVIANE DE; SOUZA,MILTON F. DE; CAMPANI,ADRIANO D.; EINLOFT,SANDRA M.O.; LIMA,JEANE E. DE; LIGABUE,ROSANE A.
Abstract:  Waterborne polyurethanes (WPUs) are interesting materials for coatings when compared to solvent-based polyurethanes, once that reducing the concentration of volatile organic compounds that are harmful for human health and the environment. However, the WPU has low weathering resistance. In order to improve this behavior among others properties, inorganic fillers has been added in these systems. SiO2 particles from various sources, mainly, from agro-industrial waste, as rice husk has attracted the scientific and technological interest. In this study, the accelerated weathering essay was performed in waterborne polyurethane (WPU)/ silica (from rice husk ash) composites in order to evaluate the thermal and physical changes in these materials. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waterborne polyurethane; Rice husk ash; Silica; Accelerated weathering resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700403

Functional properties of a Brazilian derived mouse embryonic stem cell line
Provedor de dados: 42
Autores: VAIRO,LEANDRO; MEDEI,EMILIANO; SANTOS,DANÚBIA S. DOS; RODRIGUES,DEIVID C.; GOLDENBERG,REGINA C.S.; CARVALHO,ANTONIO C. CAMPOS DE.
Pluripotent mouse embryonic stem cells (mESC) are cell lines derived from the inner cell mass of blastocyst-stage early mammalian embryos. Since ion channel modulation has been reported to interfere with both growth and differentiation process in mouse and human ESC it is important to characterize the electrophysiological properties of newly generated mESC and compare them to other lines. In this work, we studied the intercellular communication by way of gap junctions in a Brazilian derived mESC (USP-1, generated by Dr. Lygia Pereira's group) and characterized its electrophysiological properties. We used immunofluorescence and RT-PCR to reveal the presence of connexin 43 (Cx43), pluripotency markers and ion channels. Using a co-culture of neonatal mouse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cx43 channels; Electrophysiological properties; Gap junctions; Mouse embryonic stem cells.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100275

A new species of Sarax Simon, 1892 from the Philippines (Arachnida: Amblypygi: Charinidae)
Provedor de dados: 42
Autores: Giupponi,Alessandro P.L.; Miranda,Gustavo S.
A new species of the genus Sarax Simon, 1892 is described from Panay Island, Philippines. Sarax curioi sp. n. is the second species of the genus from the country and can be distinguished from the other Philippine species (Sarax brachydactylus Simon, 1892) by the sclerotized granules of the pedipalp surface, the spines of the pedipalp distitibia, the number of denticles of the chelicerae claw and the shape of the denticles of the chelicerae basal segment. Sarax newbritainensis Rahmadi and Kojima, 2010 is newly recorded from New Ireland Island, Papua New Guinea.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Southeast Asia; Taxonomy; Whip spider.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100017

Centesimal composition and physical-chemistry analysis of the edible mushroom Lentinus strigosus occurring in the Brazilian Amazon
Provedor de dados: 42
Autores: SALES-CAMPOS,CECI; ARAUJO,LIDIA M.; MINHONI,MARLI T.A.; ANDRADE,MEIRE C.N.
The centesimal composition and the physical and chemical analyses of Lentinus strigosus, an edible mushroom occurring in the Brazilian Amazon and produced in alternative substrates based on wood and agroindustrial residues, were evaluated. For this purpose, the C, N, pH, soluble solids, water activity, protein, lipids, total fiber, ash, carbohydrate, and energy levels were determined. The substrates were formulated from Simarouba amara Aubl. (“marupá”), Ochroma piramidale Cav. Ex. Lam. (“pau-de-balsa”) and Anacardium giganteum (“cajuí”) sawdust and Bactris gasipaes Kunth (“pupunheira”) stipe and Saccharum officinarum (sugar cane bagasse). The results indicated that the nutritional composition of L. strigosus varied with the substrate of cultivation; the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Edible mushroom; Nutritional value; Minerals; Protein; Fibers.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401537

Evaluation of cytogenotoxicity, antioxidant and hypoglycemiant activities of isolate compounds from Mansoa hirsuta D.C. (Bignoniaceae)
Provedor de dados: 42
Autores: PEREIRA,JOQUEBEDE R.; QUEIROZ,RAPHAEL F.; SIQUEIRA,ERLÂNIA A. DE; BRASILEIRO-VIDAL,ANA CHRISTINA; SANT’ANA,ANTÔNIO E.G.; SILVA,DANIEL M.; AFFONSO,PAULO R.A. DE MELLO.
ABSTRACT Mansoa hirsuta (Bignoniaceae) is a native plant from caatinga in Brazilian semiarid. This plant has been locally used as antimicrobial and hypoglycemiant agents, but their action mechanisms and toxicity remain largely unknown. Therefore, we evaluated the composition and antioxidant, cytoprotective and hypoglycemiant effects of raw extract, fractions and compounds from leaves of M. hirsuta. The cytogenotoxic effects of ursolic and oleanolic acids, the main phytotherapic components of this plant, were assessed. The raw extract and fractions presented steroids, saponins, flavonols, flavanonols, flavanones, xanthones, phenols, tannins, anthocyanins, anthocyanidins and flavonoids. The ethyl acetate fraction inhibited efficiently the cascade of lipid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Caatinga; Cytotoxicity; Hypoglycemiant; Phytochemistry.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100317

Intestinal and liver morphometry of the Yellow Tail Tetra (Astyanax altiparanae) fed with oregano oil
Provedor de dados: 42
Autores: FERREIRA,POLLYANNA M.F.; CALDAS,DÉBORA W.; SALARO,ANA LÚCIA; SARTORI,SIRLENE S.R.; OLIVEIRA,JERUSA M.; CARDOSO,ALEX J.S.; ZUANON,JENER A.S.
ABSTRACT This study aimed to evaluate the effect of oregano oil on the intestinal and liver morphometry of yellow tail tetra, Astyanax altiparanae. Fish (1.46 ± 0.09 g) were kept in a 60-L aquaria, at a stocking density of 0.5 fi sh L-1. Six diets containing varying amounts of oregano oil were evaluated (0.0; 0.5; 1.0; 1.5; 2.0 and 2.5 g of oregano oil kg-1). At the end of 90 days, the fi sh were euthanised. Four intestines and four livers were collected per treatment, which were fi xed in Bouin and embedded in resin. For height and width folds, the absorption surface area and thickness of the muscular layer a positive linear effect of oregano oil was observed. A decrescent linear effect on the total number of goblet cells was also observed. For the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carvacrol; Growth promoter; Intestinal histology; Liver histology; Origanum vulgare; Thymol.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300911

Effect of storage in overcoming seed dormancy ofAnnona coriacea Mart. seeds
Provedor de dados: 42
Autores: DRESCH,DAIANE M.; SCALON,SILVANA P.Q.; MASETTO,TATHIANA E.
The aim of this study was to evaluate the effect of pre-treatments on overcoming dormancy of A. coriacea seeds. Seeds were processed and stored in polyethylene bags at temperatures of at -18°C (42% RH), 5°C (34% RH), 15°C (60% RH) and 25°C (34% RH), during 0, 30, 60, 90, 120 and 150 days. After storage, seeds were immersed in 350 mg.L−1 gibberellic acid for 144 hours. Sowing was carried out in plastic bags containing Red Latosol + Bioplant®. Moisture content, emergence percentage, emergence speed index, length and dry mass of seedlings, were evaluated. The experimental design was completely randomized in a factorial with four replications of 50 seeds each. The seed storage at 5°C and subsequent immersion in gibberellic acid was efficient to reach high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annonaceae; Gibberellins; Brazilian Savanna; Temperatures.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402077

Kinematics and geometry of structures in the southern limb of the Paraíba do Sul divergent structural fan, SE Brazil: a true transtensional shear
Provedor de dados: 42
Autores: Dehler,Nolan M.; Machado,Rômulo; Dehler,Heloisa R.S.; McReath,Ian; Nummer,Alexis R.
Shear zones geometry in the Paraíba do Sul belt, southeastern Brazil, delineates a NE-trending fan-like structure. Shear zones dip towards SE in the northern limb, and towards NW in the southern one. This geometry has been interpreted either due to transpression or to late folding of flat-lying thrust surfaces. Stretching lineation plunges to ENE-ESE in the northern limb and towards NNE-NE in the southern one. Structural data in the southern limb of the divergent fan suggest a two stage kinematic evolution in high-temperature conditions: an earlier stage with top-to-SSW/SW sinistral thrusting and orogenic-parallel tangential motion, and a later stage with top-down to NNE/NE transtensional deformation. We propose a heterogeneous deformation model to explain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transtensional deformation; Extrusion; Transpression; Divergent fan.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200014

Biological associations of color variation in the Indo-Pacific swimming crab Charybdis hellerii
Provedor de dados: 42
Autores: WATANABE,TIMOTEO T.; ZARA,FERNANDO J.; HATTORI,GUSTAVO Y.; TURRA,ALEXANDER; SANT'ANNA,BRUNO S.
A marine biological invasion is a natural process accelerated by human activities, and the crab Charybdis hellerii is an example of a globally widespread invasive species. This study evaluated color variation in C. hellerii and its relationship to the sex, size and sexual maturity of these crabs, and compared the efficiency of a freeware digital image-editing program with a commercially available program. The color of the individuals was analyzed using standardized digital images. The color pattern varied significantly with size; smaller and immature individuals were darker than larger and mature ones. The female abdomen changed in morphology and color with sexual maturity, becoming wider and orange-colored. There was no statistical difference in the color...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Coloration variation; Digital image; Portunidae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100219

Carbonate cements in contemporaneous beachrocks, Jaguaribe beach, Itamaracá island, northeastern Brazil: petrographic, geochemical and isotopic aspects
Provedor de dados: 42
Autores: Guerra,Núbia C.; Kiang,Chang H.; Sial,Alcides N.
Holocene beachrocks of the Jaguaribe beach, State of Pernambuco, northeastern Brazil, consist of horizontal, cemented layers approximately 40 cm thick. The cement shows three textural varieties: (a) calciferous, surrounding siliciclastic grains, (b) micritic, with an acicular fringe; and (c) cryptocrystalline calcite in pores. Early cementation took place at the water table below beach ridges, where geochemical, hydrodynamic and, perhaps, also microbiological conditions favored rapid precipitation of aragonite and/or high-Mg calcite. delta13C values range from -1.8 to +1.5‰ for dissolved carbonate in interstitial water and from +0.2 to +2.1‰ for bioclastic components. delta18O values range from -2.8 to +0.5‰ for seawater, freshwater and interstitial water....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beachrocks; Early diagenesis; O and C isotopes; Holocene.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200011

Assessment of the antiproliferative and antigenotoxic activity and phytochemical screening of aqueous extracts of Sambucus australis Cham. &amp;amp; Schltdl. (ADOXACEAE)
Provedor de dados: 42
Autores: TEDESCO,MARÍLIA; KUHN,ANDRIELLE W.; FRESCURA,VIVIANE DAL-SOUTO; BOLIGON,ALINE A.; ATHAYDE,MARGARETH L.; TEDESCO,SOLANGE B.; SILVA,ANTONIO C.F. DA.
ABSTRACT The purpose of this study was to evaluate the antiproliferative and antigenotoxic activity of Sambucus australis Cham. &amp; Schltdl. aqueous extracts on the cell cycle of Allium cepa L. as well as determine the phenolic compounds in such extracts. S. australis inflorescences and leaves of two accessions were used for aqueous extract preparation at concentrations: 0.003 g/ml and 0.012 g/ml. A. cepa bulbs were rooted in distilled water and, subsequently, placed in treatments for 24 hours. Rootlets were collected and fixed in modified Carnoy’s solution for 24 hours and kept. The squash technique was performed for slide preparation. Root tips were smashed and stained with 2% acetic orcein, and a total of 4000 cells per treatment were analyzed. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Mitotic index; Allium cepa; Sabugueiro; High-performance liquid chromatography.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502141

The distribution of the freshwater crab Fredius reflexifrons (Ortmann, 1897) (Brachyura, Pseudothelphusidae) in an Environmental Protection Area of the Planalto da Ibiapaba, Northeastern Brazil
Provedor de dados: 42
Autores: SANTOS,LIVANIO C. DOS; NASCIMENTO,WHANDENSON M. DO; MATOS,HELAINE S.; PINHEIRO,ALLYSSON P.; SILVA,JOSÉ R.F.
Abstract  Freshwater crabs are important components of aquatic ecosystems; however, their distributions are restricted because of characteristics of their life history, which hinder conservation strategies. Fredius reflexifrons is a widely distributed freshwater crab of the Amazon basin with relictual occurrences in small wetlands on the Planalto da Ibiapaba in Northeastern Brazil. Habitat degradation, destruction of forest patches, channeling of water bodies, and the use of land for legume cropping can seriously impact the species by leading to the extinction of its relic populations, which have limited distributions in the Área de Proteção Ambiental (APA; Environmental Protection Area) Bica do Ipu of the Planalto da Ibiapaba. The objectives of this study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Conservation unit; Northeastern semiarid region; Relictual distribution.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100708

Influence of the nycthemeral cycle on the roosting behaviour of the Orange-winged Amazon
Provedor de dados: 42
Autores: Moura,Leiliany N. de; Silva,Maria Luisa da; Vielliard,Jacques M.E.
Environmental stimuli exert important effects on the expression of the endogenous rhythms. Daily movements of groups of parrots in response to the light/dark cycle have been studied by several researchers. However, the factors modifying the intrinsic rhythmicity of this behaviour remain little known. This study describes how the nychthemeral/circadian periodicity of roost daily movements of the Orange-winged Amazon Amazona amazonica is modified by weather factors. Numbers of parrots arriving or leaving the roosting site Ilha dos Papagaios were determined on a minute by minute basis. More parrots have significantly arrived at the roost after sunset than before, while more parrots have significantly left the roost before sunrise than after. The peak exodus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazona amazonica; Amazônia; Biological rhythms; Light/dark cycles; Roosting behaviour; Weather conditions.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200019

On the footprints of a major Brazilian Amazon earthquake
Provedor de dados: 42
Autores: VELOSO,ALBERTO V.
Combining historical accounts and seismological studies, three hundred years of dormant information emerged as a source of the largest known seismic event that rocked Brazil since the beginning of our colonization. The probable epicenter location of the 1690 tremor lies on the left bank of the Amazon River, about 45 km downstream from the modern day Manaus. A year later, while passing this area, a missionary met witnesses of the tremor and observed remarkable changes in the topography and vegetation along the margin of the river. By 1692 another priest confirmed this event and the occurrence of large waves in the river, which led to the flooding of the Native Indians' terrains. The tremor spread seismic waves throughout the forest and shook indigenous...
Palavras-chave: Amazon earthquake; Historical tremor; Intraplate seismicity; Seismic intensity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301115

Phenolic compounds from the rhizome of Renealmia nicolaioides Loes.: a new diarylheptanoid
Provedor de dados: 42
Autores: GEVÚ,KATHLYN V.; CARVALHO,MÁRIO G. DE; SILVA,ILNA G. DA; LIMA,HELENA R.P.; CASTRO,ROSANE N.; CUNHA,MAURA DA.
Abstract: This study aims to identify phenolic compounds in dichloromethane and methanolic extracts of the rhizome of Renealmia nicolaioides collected in the North Region of Brazil. Two known diarylheptanoids, 1,7-bis(4-hydroxyphenyl)-(1E)-1-hepten-3-one (1), and 5R-1,7-bis(4-hydroxyphenyl)-1E-hepten-5-ol (2), and a new one (1R,2S,5S)-2-hydroxy-1,7(p-hydroxyphenyl)-centrolobine (3), as well as one flavonoid, 3-metoxi-quercetin (4) were isolated by chromatographic procedure and identified by spectroscopic techniques (1H and13C NMR, HRMS and CD). The acetyl derivative of 2 was used to confirm its structure. All four compounds are reported for the first time for this genus, and this is the first occurrence of compound 1 as a natural metabolite. The results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flavonoid; Alpinieae tribe; Zingiberaceae; Underground organ.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100403

Variations in the abundance of three Parulidae species in the southern portion of the Brazilian Atlantic Forest, state of Paraná
Provedor de dados: 42
Autores: Santana,Cássius R.; Bochio,Gabriela M.; Anjos,Luiz dos.
We evaluated the distribution of abundance of three species of warblers in the southern portion of the Brazilian Atlantic Forest (BAF): Tropical Parula (Parula pitiayumi), the Golden-Crowned Warbler (Basileuterus culicivorus) and the White-Rimmed Warbler (Basileuterus leucoblepharus). Three types of forests comprise this region of the Atlantic Forest: seasonal semi-deciduous forest (SF), mixed rain forest (MF) and dense rain forest (DF). These forest types occur at different elevations: SF ranging from 200 to 800 m, MF ranging from 800 to 1,200 m and DF ranging from sea level up to 2,000 m. We used point counts in fifteen study areas distributed in the three forest types. The White-Rimmed Warbler and the Tropical Parula had higher abundances in MF, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Atlantic Forest; Basileuterus; Distribution; Elevation; Warblers.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300014

Effect of silymarin on sodium fluoride-induced toxicity and oxidative stress in rat cardiac tissues
Provedor de dados: 42
Autores: Nabavi,Seyed M.; Nabavi,Seyed F.; Moghaddam,Akbar H.; Setzer,William N.; Mirzaei,Morteza.
This study aim to evaluate the protective effect of silymarin on sodium fluoride-induced oxidative stress in rat cardiac tissues. Animals were pretreated with silymarin at 20 and 10 mg/kg prior to sodium fluoride consumption (600 ppm through drinking water). Vitamin C at 10 mg/kg was used as standard antioxidant. There was a significant increase in thiobarbituric acid reactive substances level (59.36 ± 2.19 nmol MDA eq/g tissue) along with a decrease in antioxidant enzymes activity (64.27 ± 1.98 U/g tissue for superoxide dismutase activity and 29.17 ± 1.01 µmol/min/mg protein for catalase activity) and reduced glutathione level (3.8 ± 0.15 µg/mg protein) in the tissues homogenates of the sodium fluoride-intoxicated rats. Silymarin administration to animals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Glutathione; Sodium fluoride; Superoxide dismutase; Silymarin; TBARS.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400026

Biochemical and histological characterization of tomato mutants
Provedor de dados: 42
Autores: Monteiro,Carolina C.; Rolão,Milca B.; Franco,Mônica R.; Peters,Leila P.; Cia,Mariana C.; Capaldi,Flávia R.; Carvalho,Rogério F.; Gratão,Priscila L.; Rossi,Mônica L.; Martinelli,Adriana P.; Peres,Lázaro E.P.; Azevedo,Ricardo A.
Biochemical responses inherent to antioxidant systems as well morphological and anatomical properties of photomorphogenic, hormonal and developmental tomato mutants were investigated. Compared to the non-mutant Micro-Tom (MT), we observed that the malondialdehyde (MDA) content was enhanced in the diageotropica (dgt) and lutescent (l) mutants, whilst the highest levels of hydrogen peroxide (H2O2) were observed in high pigment 1 (hp1) and aurea (au) mutants. The analyses of antioxidant enzymes revealed that all mutants exhibited reduced catalase (CAT) activity when compared to MT. Guaiacol peroxidase (GPOX) was enhanced in both sitiens (sit) and notabilis (not) mutants, whereas in not mutant there was an increase in ascorbate peroxidase (APX). Based on PAGE...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Leaf and root anatomy; Oxidative stress; Solanum lycopersicum.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200025

Tryptophan overloading activates brain regions involved with cognition, mood and anxiety
Provedor de dados: 42
Autores: SILVA,LUANA C.A.; VIANA,MILENA B.; ANDRADE,JOSÉ S.; SOUZA,MELYSSA A.; CÉSPEDES,ISABEL C.; D’ALMEIDA,VÂNIA.
ABSTRACT Tryptophan is the only precursor of serotonin and mediates serotonergic activity in the brain. Previous studies have shown that the administration of tryptophan or tryptophan depletion significantly alters cognition, mood and anxiety. Nevertheless, the neurobiological alterations that follow these changes have not yet been fully investigated. The aim of this study was to verify the effects of a tryptophan-enriched diet on immunoreactivity to Fos-protein in the rat brain. Sixteen male Wistar rats were distributed into two groups that either received standard chow diet or a tryptophan-enriched diet for a period of thirty days. On the morning of the 31st day, animals were euthanized and subsequently analyzed for Fos-immunoreactivity (Fos-ir) in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fos protein; Immunoreactivity; Serotonin; Tryptophan.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100273

Feasible domain of Walker's unsteady wall-layer model for the velocity profile in turbulent flows
Provedor de dados: 42
Autores: MIKHAILOV,MIKHAIL D.; FREIRE,ATILA P. SILVA.
The present work studies, in detail, the unsteady wall-layer model of Walker et al. (1989, AIAA J., 27, 140 – 149) for the velocity profile in turbulent flows. Two new terms are included in the transcendental non-linear system of equations that is used to determine the three main model parameters. The mathematical and physical feasible domains of the model are determined as a function of the non-dimensional pressure gradient parameter (p+). An explicit parameterization is presented for the average period between bursts (), the origin of time () and the integration constant of the time dependent equation (A0) in terms of p+. In the present procedure, all working systems of differential equations are transformed, resulting in a very fast computational...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Law of the wall; Turbulent boundary layer; Unsteady model; Feasible domain; Asymptotic theory.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402121

Low dissolved oxygen levels increase stress in piava (Megaleporinus obtusidens): iono-regulatory, metabolic and oxidative responses
Provedor de dados: 42
Autores: COPATTI,CARLOS E.; BOLNER,KEIDI C.S.; LONDERO,ÉRIKA P.; ROSSO,FELIPE L. DE; PAVANATO,MARIA A.; BALDISSEROTTO,BERNARDO.
Abstract: The aquatic environment presents daily and/or seasonal variations in dissolved oxygen (DO) levels. Piava faces different DO levels in the water due to its distributional characteristics. The goal of this study was to describe the effects of low DO levels on plasma ion, biochemical and oxidative variables in piava juveniles. Fish were exposed to different DO levels, including 1.0, 2.0, 3.0, 4.0 and 5.0 mg L-1 of DO for 96 h, after which blood and tissue samples (liver, kidney, gill and muscle) were collected. The decrease in DO levels decreased plasma Na+, Cl-, K+ and NH3 levels as well as protein and glycogen levels in the liver, kidney and muscle; increased Na+/K+-ATPase activity in the gills and kidney as well as glucose and ammonia levels in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iono-regulatory; Glucose; Lactate; Na+; K+-ATPase activity; Oxidative stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500858

Nasal carriage of resistant Staphylococcus aureus in a medical student community
Provedor de dados: 42
Autores: GUSHIKEN,CAROLINA Y.; MEDEIROS,LILIANE B.; CORREIA,BRUNA P.; SOUZA,JOYCE M.; MORIS,DANIELA V.; PEREIRA,VALERIA C.; GIUFFRIDA,ROGERIO; RODRIGUES,MARCUS V.P.
ABSTRACT Staphylococcus aureus can cause a variety of infections due to its high transmissibility, high pathogenic potential and resistance to multiple drugs, factors that contribute to the relevance of infections in healthcare services. The aim of this study was to document phenotypic and genotypic resistance factors of Staphylococcus aureus strains, isolated from nasal mucosa of medical students. A nasal swab was collected from the nares (nostrils) of 222 medical students. After collection, the samples were submitted to isolation and identification procedures. From 204 valid samples, 20.6% (42 samples) were positive for S. aureus. For the assessment of phenotypic resistance by disk-diffusion technique, from 42 samples, 95.2% showed resistance to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multidrug resistance; Colonization; MLSB resistance; MRSA.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401501

In vitro effect of globotriaosylceramide on electron transport chain complexes and redox parameters
Provedor de dados: 42
Autores: ALVARIZ,RAFAELA M.; MOREIRA,ISABEL T.D.S.; CURY,GABRIELA K.; VARGAS,CARMEN R.; BARSCHAK,ALETHÉA G.
Abstract: Fabry disease (FD) is an X-linked inherited disease and occurs due to mutations in GLA gene that encodes the α-galactosidase enzyme. Consequently, there is an accumulation of enzyme substrates, namely globotriaosylceramide (GB3). FD is a multisystemic disease, caused by storage of GB3 in vascular endothelia, with significant renal, cardiac and vascular involvement. The aim of this work was to evaluate the in vitro effect of GB3 on electron transport chain complexes (ETC) and redox parameters. Biochemical biomarkers were determined in homogenates of cerebral cortex, kidneys and liver of Wistar rats in the presence or absence of GB3 at concentrations of 3, 6, 9 and 12 mg/L. We found that GB3 caused an increase of ETC complexes II and IV activities,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electron transport chain; Fabry disease; Globotriaosylceramide; GB3; Oxidative stress; Reactive species.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300710

Purification and identification of metabolites produced by Bacillus cereus and B. subtilis active against Meloidogyne exigua, and their in silico interaction with a putative phosphoribosyltransferase fromM. incognita
Provedor de dados: 42
Autores: OLIVEIRA,DENILSON F.; SANTOS JÚNIOR,HELVÉCIO M. DOS; NUNES,ALEXANDRO S.; CAMPOS,VICENTE P.; PINHO,RENATA S.C. DE; GAJO,GIOVANNA C.
To contribute to the development of products to controlMeloidogyne exigua, the bacteria Bacillus cereus and B. subtilis were cultivated in liquid medium to produce metabolites active against this plant-parasitic nematode. Fractionation of the crude dichloromethane extracts obtained from the cultures afforded uracil, 9H-purine and dihydrouracil. All compounds were active against M. exigua, the latter being the most efficient. This substance presented a LC50 of 204 µg/mL against the nematode, while a LC50 of 260 µg/mL was observed for the commercial nematicide carbofuran. A search for protein-ligand complexes in which the ligands were structurally similar to dihydrouracil resulted in the selection of phosphoribosyltransferases, the sequences of which were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 9H-purine; Dihydrouracil; Molecular modelling; Nematicidal activity; Root-knot nematode; Uracil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200525

Euphausiacea diversity in a trans-oceanic transect through the South Atlantic Ocean: the first Atlantic record of Thysanopoda astylata Brinton, 1975
Provedor de dados: 42
Autores: MUXAGATA,ERIK; BARBOSA,CARLA N.; AGOSTINI,VANESSA O.
Abstract: ﻿Information about euphausiids in central South Atlantic Ocean is scarce; hence, we investigated species composition and distribution of euphausiids along a longitudinal transect in this region, with an emphasis on Thysanopoda. Zooplankton samples were collected from 44 stations during the first Transatlantic Commission (Brazil–Africa). Euphausiids comprised 21,390 individuals across larval stages (nauplius, calyptopis, and furcilia) and adults. Furcilia and adults were classified to species level when possible, with a total of 19 identified species. O﻿verall, Euphausia species frequency of occurrence and abundance were highest in samples collected near the African coast, while Thysanopada species dominated near the Brazilian coast. Of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euphausiids; South Atlantic; Thysanopoda astylata; Zooplankton.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100621

Inhibition of growth of U87MG human glioblastoma cells by Usnea longissima Ach.
Provedor de dados: 42
Autores: EMSEN,BUGRAHAN; OZDEMIR,OZLEM; ENGIN,TUBANUR; TOGAR,BASAK; CAVUSOGLU,SEYDA; TURKEZ,HASAN.
Abstract: Herbal medicines are efficient to reduce side effects in the fight against glioblastoma, which plays a critical role within brain cancer species. The recent studies designated for testing the effects of lichens that have shown numerous anticancer activities on glioblastoma so far. In the present study, different concentrations of water extract obtained from Usnea longissima Ach. were used in order to determine cytotoxic (via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and lactate dehydrogenase tests), antioxidant (via total antioxidant capacity test), pro-oxidant (via total oxidant status test) and genotoxic (via 8-hydroxy-2′-deoxyguanosine test) effects of them on human U87MG-glioblastoma cancer cell lines. Primary mixed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Genotoxicity; HPLC; Total antioxidant capacity; Total oxidative stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500621

Pharmaceuticals from natural products: current trends
Provedor de dados: 42
Autores: SEIDL,PETER R.
The use of products extracted from plants for medicinal purposes can be traced to the beginnings of civilization and up until the end of the nineteenth century natural products were the principal source of medicines. Since then their relative importance has oscillated according to the strategies of large pharmaceutical companies. Now that these strategies are changing, there are new opportunities for countries like Brazil, in which a large proportion of the world's biodiversity is located. There are, however, new circumstances that must be taken into consideration: material must be collected by groups which are formally authorized to do so and under the conditions of the Convention of Biological Diversity, the discovery process is being successively...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pharmaceutical industry; Outsourcing; Collection; Benefit-sharing; Integration.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100011

A new name for Agromyza flava Sousa &amp;amp; Couri (Diptera: Agromyzidae)
Provedor de dados: 42
Autores: SOUSA,VIVIANE R. DE; COURI,MÁRCIA S.
ABSTRACT A new name Agromyza pauciflava nom. nov. is proposed for Agromyza flava Sousa &amp; Couri.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Agromyzidae; Name correction; Nomenclature; Taxonomy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401641

Biting midges (Diptera: Ceratopogonidae) from an urban forest fragment in Central Amazon (Brazil): Effects of opening areas on abundance, richness, and composition
Provedor de dados: 42
Autores: DOURADO,EDUARDA D.R.; FERREIRA-KEPPLER,RUTH L.; MARTINS,RENATO T.; RONDEROS,MARIA M.
ABSTRACT We assessed the immature stages of Ceratopogonidae (Diptera) in artificial containers in an urban forest fragment in Manaus (Brazil), including their behavioral, biological and ecological information. In addition, we evaluated the effects of deforestation in an open and forested area on Ceratopogonidae communities. Immatures were sampled between August 2012 and July 2014 in artificial containers installed in both habitat types. We collected 685 immatures of seven morpho-species of Bezzia Kieffer, Culicoides Latreille, Dasyhelea Kieffer, Forcipomyia Meigen, and Palpomyia Meigen. In the open area, we recorded higher temperature and electrical conductivity values than in the forested area; however, these variables did not differ between seasons....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Aquatic insects; Artificial containers; Deforestation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602757

Inhibition of proteases and phospholipases A2 from Bothrops atrox and Crotalus durissus terrificus snake venoms by ascorbic acid, vitamin E, and B-complex vitamins
Provedor de dados: 42
Autores: OLIVEIRA,CARLOS H.M.; SIMÃO,ANDERSON A.; TRENTO,MARCUS V.C.; CÉSAR,PEDRO H.S.; MARCUSSI,SILVANA.
ABSTRACT The enzyme inhibition by natural and/ or low-cost compounds may represent a valuable adjunct to traditional serotherapy performed in cases of snakebite, mainly with a view to mitigate the local effects of envenoming. The objective of this study was to evaluate possible interactions between vitamins and enzymes that comprise Bothrops atrox and Crotalus durissus terrificus venoms, in vitro. Proteolysis inhibition assays (substrates: azocasein, collagen, gelatin and fibrinogen), hemolysis, coagulation, hemagglutination were carried out using different proportions of vitamins in face of to inhibit minimum effective dose of each venom. The vitamins were responsible for reducing 100% of breaking azocasein by C.d.t. venom, thrombolysis induced by B....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiophidian properties; Antioxidants; Blood cells; Hemostatic processes; Natural inhibitors.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000502005

The performance of the (U+Th)/He thermochronology laboratory at UNESP Rio Claro, Brazil
Provedor de dados: 42
Autores: SIQUEIRA-RIBEIRO,MARLI C.; MARIN,DANIELI F.C.; HACKSPACHER,PETER C.; STUART,FINLAY M.
We have developed the first laboratory for (U-Th-Sm)/He thermochronology measurements in South America. Helium is measured using a high-sensitivity magnetic sector mass spectrometer (GVI-Helix-SFT) and a double focusing single collector inductively coupled plasma mass spectrometer (Thermo Scientific ELEMENT2) is used for U, Th and Sm determinations. Repeated analyses of fragments of Durango fluorapatite crystals yields an average age of 31.6 ± 1.6 Ma (2σ) (n=62). This overlaps the long-term average of Durango fluorapatite measured in laboratories worldwide. The analysis of multiple single apatite crystals of a Precambrian basement sample from Serra do Mar, southeastern Brazil, yields an average He age (60.5 ± 8.7 Ma; n=8) that overlaps that measured in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: (U-Th)/He dating; He calibration; Noble Gas; Serra do Mar AHe ages.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100502

Herpetofauna of an Atlantic rainforest area (Morro São João) in Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Almeida-Gomes,Mauricio; Vrcibradic,Davor; Siqueira,Carla C.; Kiefer,Mara C.; Klaion,Thaís; Almeida-Santos,Patrícia; Nascimento,Denise; Ariani,Cristina V.; Borges-Junior,Vitor N.T.; Freitas-Filho,Ricardo F.; van Sluys,Monique; Rocha,Carlos F.D.
We studied the herpetofaunal community from the Atlantic forest of Morro São João, in Rio de Janeiro State, Brazil, and present data on species composition, richness, relative abundance and densities. We combined three sampling methods: plot sampling, visual encounter surveys and pit-fall traps. We recorded sixteen species of amphibians and nine of reptiles. The estimated densities (based on results of plot sampling) were 4.5 ind/100 m2 for amphibians and 0.8 ind/100 m² for lizards, and the overall density (amphibians and lizards) was 5.3 ind/100 m². For amphibians, Eleutherodactylus and Scinax were the most speciose genera with three species each, and Eleutherodactylus binotatus was the most abundant species (mean density of 3.0 frogs/100 m²). The reptile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herpetofauna; Atlantic rainforest; Brazil; Richness; Density.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200007

Sugarcane inoculated with endophytic diazotrophic bacteria: effects on yield, biological nitrogen fixation and industrial characteristics
Provedor de dados: 42
Autores: ANTUNES,JADSON EMANUEL L.; FREITAS,ANA DOLORES S. DE; OLIVEIRA,LOUISE M.S.; LYRA,MARIA DO CARMO C.P. DE; FONSECA,MANOEL A.C.; SANTOS,CAROLINA E.R.S.; OLIVEIRA,JOSÉ DE PAULA; ARAÚJO,ADEMIR SÉRGIO F. DE; FIGUEIREDO,MÁRCIA V.B.
Abstract:  The growing need for the use of clean energy has led society to seek alternatives to fossil fuels in order to less pollute the environment. Sugarcane has been known to produce enough biomass and to have associative microorganisms, such as plant growth-promoting bacteria (PGPB), which have the potential to improve the yield of crops. The objective of this study is to evaluate the efficiency and the isotopic dilution of 15N of microbial inoculants containing endophytic diazotrophic bacteria, individually inoculated and in mixture, on productivity, technological quality and biological nitrogen fixation (BNF) of sugarcane variety RB92579. The experiment was conducted for three consecutive years, comprising different crop cycles, in a completely...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus megaterium; Herbaspirillum seropecicae; Microbial inoculant; Natural abundance of 15N; Pseudomonas sp.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700863

Influence of wing bands and behavior of Anastrepha fraterculus (Diptera: Tephritidae) by the presence of Megafreya sutrix (Araneae: Salticidae)
Provedor de dados: 42
Autores: ,PRISCILLA C. GOBBI; ,ADRISE M. NUNES; ,EDISON ZEFA; ,FLAVIO R.M. GARCIA.
Abstract  The objective of this study was to evaluate the influence of wing bands and the behavior of Anastrepha fraterculus in the presence of Megafreya sutrix. The first experiment used specimens of M. sutrix (n = 40), 20 males and 20 females of A. fraterculus and Musca domestica. The second experiment used 20 individuals of M. sutrix (10 males and 10 females) and 120 of A. fraterculus (20 males and 20 females) for each treatment. Marks were made on the wings of the flies: a group with painted wing bands (n = 40) with their wings fully painted; another with highlighted wing bands (n = 40) and normal bands (n = 40). Recordings were made for 15 min or until the fly was preyed upon. The analyses were performed through observation of the recordings and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interaction; Fruit fly; Predator; Spider; Biological control; Behavior.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201008

Occurrence of the Indo-Pacific freshwater prawn Macrobrachium equidens Dana 1852 (Decapoda, Palaemonidae) on the coast of Brazilian Amazonia, with notes on its reproductive biology
Provedor de dados: 42
Autores: Maciel,Cristiana R; Quadros,Manoel L; Abrunhosa,Fernando; Bastos,Sandra; Schneider,Horacio; Sampaio,Iracilda.
The freshwater prawn Macrobrachium equidens, which is native species of the Indo-Pacific Region, was recorded for the first time on the Amazon coast of Brazil. This species was found to inhabit the same environment as two native Macrobrachium species, M. amazonicum and M. acanthurus, and is morphologically very similar to the latter. The identification of the species was confirmed by the genetic analysis of sequences of the mitochondrial Cytochrome Oxidase (COI) gene. A detailed description of the morphological features and reproductive biology of M. equidens in this new environment is presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustacean; Caeté Estuary; Invasive species; Mitochondrial COI gene; Reproductive biology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200013

Antibiotic resistance and enterotoxin genes in Staphylococcus sp. isolates from polluted water in Southern Brazil
Provedor de dados: 42
Autores: BASSO,ANA P.; MARTINS,PAULA D.; NACHTIGALL,GISELE; SAND,SUELI VAN DER; MOURA,TIANE M. DE; FRAZZON,ANA PAULA G.
The aim of this study was to evaluate the species distribution, antibiotic-resistance profile and presence of enterotoxin (SE) genes in staphylococci isolated from the Dilúvio stream in South Brazil. Eighty-eight staphylococci were identified, 93.18% were identified as coagulase-negative (CNS) and 6.82% coagulase-positive (CPS). Fourteen Staphylococcus species were detected and the most frequently were Staphylococcus cohnii(30.48%) and S. haemolyticus(21.95%). Resistance to erythromycin was verified in 37.50% of the strains, followed by 27.27% to penicillin, 12.50% to clindamycin, 6.81% to trimethoprim-sulfamethoxazole, 5.68% to chloramphenicol and 2.27% to norfloxacin. None of the investigated strains showed gentamicin and ciprofloxacin resistance. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coagulase negative staphylococcus; Coagulase-positive staphylococcus; Antibiotic resistant staphylococcus; Enterotoxin genes; Polluted water.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401813

Antifungal and antitumor models of bioactive protective peptides
Provedor de dados: 42
Autores: Rodrigues,Elaine G.; Dobroff,Andrey S.; Taborda,Carlos P.; Travassos,Luiz R.
Peptides are remarkably reactive molecules produced by a great variety of species and able to display a number of functions in uni-and multicellular organisms as mediators, agonists and regulating substances. Some of them exert cytotoxic effects on cells other than those that produced them, and may have a role in controlling subpopulations and protecting certain species or cell types. Presently, we focus on antifungal and antitumor peptides and discuss a few models in which specific sequences and structures exerted direct inhibitory effects or stimulated a protective immune response. The killer peptide, deduced from an antiidiotypic antibody, with several antimicrobial activities and other Ig-derived peptides with cytotoxic activities including antitumor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactive peptides; Paracoccidioides brasiliensis; Tumor cells; Killer peptide; Melanoma; Apoptosis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300015

Antifungal activity of the extracts and saponins from Sapindus saponaria L.
Provedor de dados: 42
Autores: Tsuzuki,Joyce K.; Svidzinski,Terezinha I.E.; Shinobu,Cristiane S.; Silva,Luiz F.A.; Rodrigues-Filho,Edson; Cortez,Diógenes A.G.; Ferreira,Izabel C.P.
Extracts from the dried pericarp of Sapindus saponaria L. (Sapindaceae) fruits were investigated for their antifungal activity against clinical isolates of yeasts Candida albicans and C. non-albicans from vaginal secretions of women with Vulvovaginal Candidiasis. Four clinical isolates of C. albicans, a single clinical isolated of each of the species C. parapsilosis, C. glabrata, C. tropicalis, and the strain of C. albicans ATCC 90028 were used. The hydroalcoholic extract was bioactivity-directed against a clinical isolate of C. parapsilosis, and showed strong activity. The n-BuOH extract and one fraction showed strong activity against all isolates tested. Further column-chromatography on silica gel separation of this fraction afforded two pure triterpene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sapindaceae; Sapindus saponaria; Saponins; Antifungal activity; Candida.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400002

Late Quaternary landscape evolution of northeastern Amazonia from pollen and diatom records
Provedor de dados: 42
Autores: CASTRO,DARCILÉA F.; OLIVEIRA,PAULO E. DE; ROSSETTI,DILCE F.; PESSENDA,LUIZ C.R.
The main goal of this study was to reconstruct the Late Pleistocene-Holocene floristic composition in an area of the northern Brazilian Amazonia, comparing the results with other Amazonian localities in order to discuss the factors that have influenced phytophysiognomic changes over this time period. The work in eastern Marajó Island at the mouth of the Amazonas River was approached based on analysis of 98 pollen and diatom samples from core data distributed along a proximal to distal transect of a paleoestuarine system. The results indicated high concentration of Rhizophora, associated with arboreal pollen grains typical of the modern Amazonian rainforest during the last 40,000 cal yrs BP. Pollen composition also included wetland herbs. Diatoms were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetation pattern; Climate; Late Quaternary; Paleoenvironment; Marajó Island; Northeastern Amazonia.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100035

Luminescence dated Late Pleistocene wave-built terraces in northeastern Brazil
Provedor de dados: 42
Autores: Suguio,Kenitiro; Bezerra,Francisco H.R.; Barreto,Alcina M.F.
This study presents field and chronological investigations along the coast of northeastern Brazil from ~4°S to 9°S latitude, which corresponds to ~700 km of coastline under a semi-diurnal mesotidal regime. We investigated wave-built terrace deposits and dated sediments using the optically stimulated luminescence and thermoluminescence methods on quartz grains. The wave-built terraces yielded two main age groups: 200-230 ka and 100-130 ka, which we interpreted as depositional ages. We correlated these age groups with oxygen-isotope stages 7c and 5e, respectively. These events correspond to the antepenultimate and penultimate transgressions along the Brazilian coast. The deposits occur mainly in patches on low-lying flat plateaus along the littoral zone and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Luinescence dating; Northeastern razil; Pleistocene; Sea-level change.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300011

High quality synthetic quartz crystal growth for the information technology
Provedor de dados: 42
Autores: Shinohara,Armando H.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400031

Two special organelles found in Trypanosoma cruzi
Provedor de dados: 42
Autores: SOUZA,WANDERLEY DE; CARREIRO,ISABEL PORTO; MIRANDA,KILDARE; SILVA,NARCISA L. CUNHA E.
We review here two unique organelles from Trypanosoma cruzi. One of them is the acidocalcisome, cytoplasmic vacuoles containing a very high Ca2+ concentration and a Ca2+ - H+ translocating ATPase activity, present in all trypanosomatids. The other organelle is the reservosome, site of accumulation of endocytosed macromolecules, very rich in cysteine proteinase, that is present only in epimastigote forms of trypanosomes belonging to the Schyzotrypanum sub-genus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidocalcisome; Reservosome; Trypanosoma cruzi.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300016

Computation of the sampling distribution of coherence estimate
Provedor de dados: 42
Autores: Nadarajah,Saralees; Kotz,Samuel.
The recent paper published by Miranda de Sa (2004) derived, for the first time, the sampling distribution of coherence estimated between two signals. The paper also considered computational issues of the sampling distribution, using an approximate method. In this short note, we provided several 1-line programs for the exact computation of various measures of the sampling distribution. The advantages of using these programs are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coherence estimate; Non central beta distribution; R language; Sampling distribution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400016

The occurrence of intermediate schorl-dravite and alkali-deficient, Cr-(V)bearing tourmalines in the volcanic-sedimentary sequence of the Serra do Itaberaba Group - SP
Provedor de dados: 42
Autores: GARDA,GIANNA M.; BELJAVSKIS,PAULO; JULIANI,CAETANO; SILVA,DAILTO.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300023

Developmental pathway from leaves to galls induced by a sap-feeding insect on Schinus polygamus (Cav.) Cabrera (Anacardiaceae)
Provedor de dados: 42
Autores: DIAS,GRACIELA G.; FERREIRA,BRUNO G.; MOREIRA,GILSON R.P.; ISAIAS,ROSY M.S.
Galling sap-feeding insects are presumed to cause only minor changes in host plant tissues, because they usually do not require development of nutritive tissues for their own use. This premise was examined through comparison of the histometry, cytometry and anatomical development of non-galled leaves and galls of Calophya duvauae (Scott) (Hemiptera: Calophyidae) on Schinus polygamus (Cav.) Cabrera (Anacardiaceae). Cell fates changed from non-galled leaves to galls during the course of tissue differentiation. C. duvauae caused changes in dermal, ground, and vascular systems of the leaves of S. polygamus. Its feeding activity induced the homogenization of the parenchyma, and the neoformation of vascular bundles and trichomes. The histometric and cytometric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hemipteran gall; Histometry; Developmental patterns; Cell fates.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100187

Effect of carbon source on production, characterization and bioactivity of exopolysaccharide produced by Phellinus vaninii Ljup
Provedor de dados: 42
Autores: XU,CHUNPING; YU,JINWEI; ZHAO,SHANSHAN; WU,SHUNGSHUNG; HE,PEIXIN; JIA,XUEWEI; LIU,YANQI; MAO,DUOBIN.
ABSTRACT The effect on different three carbon source (i.e. glucose, fructose and sucrose) on production, chemical characterization and antioxidant activity of exopolysaccharide (EPS) produced by Phellinus vaninii Ljup was investigated in this study. Amongst carbon sources examined, glucose and sucrose were favorable for the mycelia growth, while the maximum EPS yield was achieved when sucrose was employed. The predominant carbohydrate compositions in EPSs identified were gluconic acid, glucose, mannose and galactose acid. Then, FT-IR spectral analysis revealed prominent characteristic groups in EPSs. EPSs molecule exist as nearly globular shape form in aqueous solution. The variation also affects antioxidant activities by investigated by using hydroxyl and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phellinus vaninii Ljup; Exopolysaccharide; Carbon source; Antioxidant activity; Composition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502033

The use of Fluorescence Resonance Energy Transfer (FRET) peptidesfor measurement of clinically important proteolytic enzymes
Provedor de dados: 42
Autores: Carmona,Adriana K.; Juliano,Maria Aparecida; Juliano,Luiz.
Proteolytic enzymes have a fundamental role in many biological processes and are associated with multiple pathological conditions. Therefore, targeting these enzymes may be important for a better understanding of their function and development of therapeutic inhibitors. Fluorescence Resonance Energy Transfer (FRET) peptides are convenient tools for the study of peptidases specificity as they allow monitoring of the reaction on a continuous basis, providing a rapid method for the determination of enzymatic activity. Hydrolysis of a peptide bond between the donor/acceptor pair generates fluorescence that permits the measurement of the activity of nanomolar concentrations of the enzyme. The assays can be performed directly in a cuvette of the fluorimeter or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continuous recording assay; Fluorescence resonance energy transfer; FRET substrates; Proteolytic enzymes; Angiotensin I-converting enzyme; Neprilisin.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300005

Protective effects of steroidal alkaloids isolated from Solanum paniculatum L. against mitomycin cytotoxic and genotoxic actions
Provedor de dados: 42
Autores: VIEIRA,PABLINE M.; MARINHO,LORENA P.M.; FERRI,SUZANA C.S.; CHEN-CHEN,LEE.
Solanum paniculatum L. is a plant species widespread throughout tropical America, especially in the Brazilian Cerrado region. It is used in Brazil for culinary purposes and in folk medicine to treat liver and gastric dysfunctions, as well as hangovers. Previous studies with S. paniculatum ethanolic leaf extract or ethanolic fruit extract demonstrated that they have no genotoxic activity neither in mice nor in bacterial strains, although their cytotoxicity and antigenotoxicity were demonstrated in higher doses. In order to assess the possible compounds responsible for the activities observed, we fractionated the ethanolic fruit extract of S. paniculatum, characterized by 1H and 13C NMR spectra, and evaluated two fractions containing steroidal alkaloids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anticytotoxicity; Antigenotoxicity; Jurubeba; Micronuclei; Solanaceae.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200553

Analysis of the marine shrimp culture production chain in Southern Brazil
Provedor de dados: 42
Autores: Freitas,Rodrigo R.; Vinatea,Luis; A. Netto,Sérgio.
This study was elaborated to identify and describe the main links of the sea shrimp productive chain in the municipal district of Laguna, historically known as the main sea shrimp (Litopenaeus vannamei) production area in the State of Santa Catarina, Brazil. The study, held from April to July 2005, previously identified the local productive process through observation, interviews and bibliographical research. Afterwards, specific questionnaires were elaborated for each of the several segments connected to the local activity. A total of 90 interviews were conducted, intending to map out the procedures and functionality of the productive chain, from the necessary inputs for production to the moment of shrimp acquisition by final consumers. Results indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litopenaeus vannamei; Marine shrimp culture; Production risks; Supply chain.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200015

Diversity of anurans in dry forest fragments of a subtropical region in Brazil
Provedor de dados: 42
Autores: SANTOS,EDUARDO J. DOS; CONTE,CARLOS E.
ABSTRACT This study aimed to identify and compare the diversity between two areas within different matrices located in the Mesophytic Semideciduous Forest; to compare composition and diversity registered to other assemblages; and to evaluate which criteria used here were the most important when sampling them. Data was obtained from September 2011 to March 2012 from 10 sites with different habitats in two areas of mid northern state of Paraná, southern Brazil. We recorded 18 species. Alfa-diversity between the areas did not vary, but the population within one of them was more stable, suggesting better distribution and equity of species in the available habitat. Beta-diversity in the region was high; a result attributed to the species Dendropsophus nanus....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Semideciduous Forest; Inventory; Richness; Abundance; Comparison.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501923

Probiotics protect the intestinal wall of morphological changes caused by malnutrition
Provedor de dados: 42
Autores: AZEVEDO,JORGE F. DE; HERMES-ULIANA,CATCHIA; LIMA,DIRLENE P.; SANT'ANA,DÉBORA M.G.; ALVES,GILBERTO; ARAÚJO,EDUARDO J.A.
This study sought to morphometrically analyze the jejunal wall of protein-malnourished rats administered a probiotic supplement. The sample consisted of recently weaned Wistar rats (Rattus norvegicus) distributed among four groups: animals given a commercial diet (G1, n = 4); animals given the same ration as G1 plus a probiotic supplement (G2, n = 4); animals given a 4% protein diet (G3, n = 4); and animals given the same ration as G3 plus a probiotic supplement (G4, n = 4). After 12 weeks, part of the jejunum was harvested and subjected to routine histological processing. Transverse sections with a thickness of 3 µm were stained with HE, and histochemical techniques were used to assay for glycoconjugates, including staining with periodic acid-Schiff (PAS)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bowel; Digestive system; Histology; Morphometry; Protein-energy malnutrition; Small intestine.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301303

Inorganic and organic trace mineral supplementation in weanling pig diets
Provedor de dados: 42
Autores: THOMAZ,MARIA C.; WATANABE,PEDRO H.; PASCOAL,LEONARDO A.F.; ASSIS,MURILO M.; RUIZ,URBANO S.; AMORIM,ALESSANDRO B.; SILVA,SUSANA Z.; ALMEIDA,VIVIAN V.; MELO,GABRIEL M.P.; ROBLES-HUAYNATE,RIZAL A.
A study was conducted to evaluate the effects of dietary inorganic and organic trace minerals in two levels of supplementation regarding performance, diarrhea occurrence, hematological parameters, fecal mineral excretion and mineral retention in metacarpals and liver of weanling pigs. Seventy piglets weaned at 21 days of age with an average initial body weight of 6.70 ± 0.38 kg were allotted in five treatments: control diet (no added trace mineral premix); 50% ITMP (control diet with inorganic trace mineral premix supplying only 50% of trace mineral requirements); 50% OTMP (control diet with organic trace mineral premix supplying only 50% of trace mineral requirements); 100% ITMP (control diet with inorganic trace mineral premix supplying 100% of trace...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nursery phase; Performance; Weaning; Piglet.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201071

Thyroid hormone actions on the microglial development
Provedor de dados: 42
Autores: LIMA,FLAVIA R. SOUZA; GERVAIS,ANNIE; MOURA NETO,VIVALDO; MALLAT,MICHEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300033

Elemental composition of vegetables cultivated over coal-mining waste
Provedor de dados: 42
Autores: ZOCCHE,JAIRO J.; ROHR,PAULA; DAMIANI,ADRIANI P.; LEFFA,DANIELA D.; MARTINS,MIRIAM C.; ZOCCHE,CAROLINE M.; TEIXEIRA,KARINA O.; BORGES,GABRIELA D.; JESUS,MAIELLEN M. DE; SANTOS,CARLA E.I. DOS; DIAS,JOHNNY F.; ANDRADE,VANESSA M. DE.
ABSTRACT We assessed elemental composition of the liver in mice subjected to one-time or chronic consumption of the juice of vegetables cultivated in a vegetable garden built over deposits of coal waste. Lactuca sativa L. (lettuce), Beta vulgaris L. (beet), Brassica oleracea L. var. italica (broccoli) and Brassica oleracea L. var. acephala (kale) were collected from the coal-mining area and from a certified organic farm (control). Elemental composition was analyzed by particle-induced X-ray emission (PIXE) method. Concentrations of Mg, S, and Ca of mice subjected to one-time consumption of broccoli and concentrations of these same elements plus Si of mice receiving kale were higher in the coal-mining area. Concentrations of P, K, and Cu were increase after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coal; Anthropogenic soil; Trace elements; Heavy metals; Plants; PIXE.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502383

L-carnitine supplementation in the recovery of plasma L-carnitine in patients with heart failure submitted to coronary artery bypass grafting
Provedor de dados: 42
Autores: CRUZ,WANISE M. SOUZA; GUIMARÃES,SHEILA M.S.; MACIEL,GABRIELLE C.; HUGUENIN,ANA BEATRIZ A.; CARVALHO,MONICQUE E.M. DE; COSTA,BÁRBARA O.; SILVA,GEISIANE A. DA; COLAFRANCESCHI,ALEXANDRE S.; SCALCO,FERNANDA B.; RIBEIRO,MARCIA.
Abstract Coronary artery bypass grafting reduces plasma L-carnitine and may impair the production of myocardial energy. L-carnitine supplementation may elevate plasma L-carnitine and increase cardiac mechanical efficiency. The objective of this study was to verify the recovery of preoperative plasma LC in patients with heart failure undergoing coronary artery bypass grafting supplemented with a daily oral dose of 50 mg / kg. Volunteers with ischemic heart failure who underwent surgery were randomized into a supplemented group (A-received 50 mg / kg L-carnitine) or placebo group (B) for 60 days. Supplementation was started on the third postoperative day. The spectrophotometric enzymatic method was used to quantify plasma L-carnitine. In the preoperative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ischemic heart failure; Myocardial revascularization surgery; Oral L-carnitine supplementation; Plasma L-carnitine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603099

Richness and density of aquatic benthic macroinvertebrates after exposure to fungicides and insecticides in rice paddy fields
Provedor de dados: 42
Autores: WANDSCHEER,ALANA C.D.; MARCHESAN,ENIO; SANTOS,SANDRO; ZANELLA,RENATO; SILVA,MARÍLIA F.; LONDERO,GUILHERME P.; DONATO,GABRIEL.
ABSTRACT The objective of this study was to verify the richness and density of aquatic benthic macroinvertebrates after exposure to fungicides and insecticides of the rice paddy fields. In the crop seasons of 2012/13 and 2013/14, field experiments were performed, which consisted of single-dose applications of the fungicides trifloxystrobin + tebuconazole and tricyclazole, and the insecticides lambda-cyhalothrin + thiamethoxam and diflubenzuron, in 10 m2 experimental plots, over rice plants in the R3 stage. Control plots with and without rice plants were maintained in order to simulate a natural environment. Soil samples were collected during rice cultivation for assessment of the macroinvertebrate fauna. Chemical-physical parameters assessed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Lowlands; Oryza sativa L.; Pesticides.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100355

Cortical connections of area V4 in the macaque
Provedor de dados: 42
Autores: UNGERLEIDER,LESLIE G.; MONTEIRO,RENATA A. P.; GATTASS,RICARDO; DESIMONE,ROBERT.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300036

Copepod distribution and production in a Mid-Atlantic Ridge archipelago
Provedor de dados: 42
Autores: MELO,PEDRO A.M.C.; MELO JÚNIOR,MAURO DE; MACÊDO,SILVIO J. DE; ARAUJO,MOACYR; NEUMANN-LEITÃO,SIGRID.
The Saint Peter and Saint Paul Archipelago (SPSPA) are located close to the Equator in the Atlantic Ocean. The aim of this study was to assess the spatial variations in the copepod community abundance, and the biomass and production patterns of the three most abundant calanoid species in the SPSPA. Plankton samples were collected with a 300 µm mesh size net along four transects (north, east, south and west of the SPSPA), with four stations plotted in each transect. All transects exhibited a tendency toward a decrease in copepod density with increasing distance from the SPSPA, statistically proved in the North. Density varied from 3.33 to 182.18 ind.m−3, and differences were also found between the first perimeter (first circular distance band) and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oligotrophic; Plankton; St. Peter and St. Paul archipelago; Tropical; Upwelling.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401719

Population suppression of Ceratitis capitata (Wiedemann) on table grapes using toxic baits
Provedor de dados: 42
Autores: BARONIO,CLÉBER A.; BERNARDI,DANIEL; PARANHOS,BEATRIZ A.J.; GARCIA,FLÁVIO R.M.; BOTTON,MARCOS.
Abstract To provide alternatives to the use of spraying synthetic insecticides in C. capitata management, was evaluated the effect of “attract and kill” toxic baits on population suppression of C. capitata in three commercial areas producing table grapes. Toxic baits of Gelsura™ (4.5 L ha-1) and Success™ 0.02 CB (4.0 L ha-1) resulted in lower population levels of C. capitata adults in monitoring traps after five sequential applications at weekly intervals during the maturation period of the grapes when compared with control plots with or without insecticidal spray. In addition, plots with Gelsura™ and Success™ 0.02 CB applications showed a significant reduction in damage (%) by C. capitata on grape berries and grape bunches when compared with control plots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attract-and-kill; Alpha-cypermethrin; Spinosad; Integrated Pest Management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703963

The role of research methodology in the rational use of technology in monitoring and preventing communication disorders
Provedor de dados: 42
Autores: Chiari,Brasília M.; Goulart,Bárbara N. G.
Studies showing stronger scientific evidence related to speech, language and hearing pathology (SLP) have an impact on the prevention and rehabilitation of human communication and gained ground in SLP research agenda. In this paper we discuss some aspects and directions that should be considered for in-depth knowledge about speech, language and hearing needs in different population groups (age group, gender and other variables according to specific related disorders) for improved comprehensive care, successful efforts and effective use of financial and human resources. It is also discussed the decision making process for requesting complementary evaluations and tests, from routine to highly complex ones, that should be based on each test and/or procedure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Communication disorders; Diagnosis of health situation; Epidemiology; Epidemiologic measurements; Needs assessment; Cost-effectiveness evaluation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300014

Chemical study and larvicidal activity against Aedes aegypti of essential oil of Piper aduncum L. (Piperaceae)
Provedor de dados: 42
Autores: OLIVEIRA,GISELE L.; CARDOSO,SHEILA K.; LARA JÚNIOR,CéLIO R.; VIEIRA,THALLYTA M.; GUIMARãES,ELSIE F.; FIGUEIREDO,LOURDES S.; MARTINS,ERNANE R.; MOREIRA,DAVYSON L.; KAPLAN,MARIA AUXILIADORA C.
ABSTRACTPiper aduncum L. is used in folk medicine to treat respiratory and inflammatory diseases. The aim of this study was to analyze the essential oil from leaves ofP. aduncum collected in the Brazilian Cerrado, North of Minas Gerais, as well as to evaluate the larvicidal activity of this oil and of its major constituent. The essential oil was analyzed by gas chromatography coupled to flame ionization detector and gas chromatography coupled to mass spectrometry that allowed characterizing 23 compounds (monoterpenes: 90.4%; sesquiterpenes: 7.0%). The major component was 1,8-cineole (53.9%). This oil showed to be very different from those obtained from the same species. Larvae of A. aegypti were exposed to different concentrations of the essential oil and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper aduncum Aedes aegypti larvicidal activity dengue 1; 8-cineole GC-MS.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401227

Agroforestry systems and understory harvest management: the impact on growth and productivity of dual-purpose wheat
Provedor de dados: 42
Autores: CARON,BRAULIO O.; PINHEIRO,MARCOS VINÍCIUS M.; KORCELSKI,CLEITON; SCHWERZ,FELIPE; ELLI,ELVIS FELIPE; SGARBOSSA,JAQUELINE; TIBOLLA,LILIANE B.
Abstract:  The objective of the study was to evaluate the growth and production efficiency of forage-grain dual-purpose wheat in two arrangements and four agroforestry systems (Intercrop-I and Intercrop-II), as well as to evaluate crop management for the wheat crops in two planting seasons (Crop Season I-2014 and Crop Season II-2015. The experiment was conducted in a randomized complete block design, factorial scheme 7x2x2, with seven cultivation systems Eucalyptus urophylla x Eucalyptus grandis Intercrop-II and Intercrop-I; Peltophorum dubium Intercrop-II and Intercrop-I; P. rigida Intercrop-I; S. parahyba Intercrop-I; a wheat monoculture with no tree species present; and two harvest management techniques (with and without harvesting of the forage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BRS Tarumã wheat; Conversion efficiency; Phyllochron; Triticum aestivum.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700859

Agaricus subrufescens: substratum nitrogen concentration and mycelial extraction method on antitumor activity
Provedor de dados: 42
Autores: BERTÉLI,MÍRIA B.D.; LOPES,ANA D.; COLLA,ITARUÃ M.; LINDE,GIANI A.; COLAUTO,NELSON B.
ABSTRACT Antitumor activity of Agaricus subrufescens has been shown on vegetative mycelium and basidiocarp. However, few studies have assessed the effect of A. subrufescens cultivation conditions and extraction methods on antitumor activity. This study evaluated the effect of nitrogen concentration on the cultivation medium of A. subrufescens and the extraction method of mycelial antineoplastic actives against sarcoma 180 cells implanted in mice. Two nitrogen sources (isolated soybean protein and NaNO3) and 10 nitrogen concentrations (0.25 to 8.0 g/L) were used. Dried mycelium extract was obtained by hot water infusion (1:10 mass:volume; 90 °C) or by aqueous mixture (1:10 mass:volume, ambient temperature) in ultrapure water. The doses were administered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agaricus blazei; Agaricus brasiliensis; Antineoplastic; Basidiocarp; Medicinal mushrooms; Mycelium.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602239

Neoproterozoic acid magmatism in western India
Provedor de dados: 42
Autores: PANDIT,MANOJ K.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300033

Tannic extract potential as natural wood preservative of Acacia mearnsii
Provedor de dados: 42
Autores: SILVEIRA,AMANDA G. DA; SANTINI,ELIO J.; KULCZYNSKI,STELA M.; TREVISAN,RÔMULO; WASTOWSKI,ARCI D.; GATTO,DARCI A.
ABSTRACT High toxicity of the preservatives most frequently used in wood treatment and the resulting risks of handling pose a threat to small producers and to the environment. In an attempt to mitigate these problems, the present study was conducted with the objective of evaluating the preservative effect of tannic extract on biodeterioration of Acacia mearnsii wood. For this purpose, untreated and preserved specimens, some with tannin extract and some with a preservative mixture based on CCB (Chromated Copper Borate), were submitted to accelerated rotting trials with the fungus that causes white rot (Pycnoporus sanguineus) for 16 weeks. The evaluations were made with a basis on weight loss and chemical components analysis, and they showed that the natural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extractives; Laboratory testing; Wood quality; White rot.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603031

Use of the correlation between input variables in estimating the risk of feedlot finishing of steers and young steers
Provedor de dados: 42
Autores: PACHECO,PAULO S.; RESTLE,JOÃO; PASCOAL,LEONIR L.; VAZ,FABIANO N.; VAZ,RICARDO Z.; VALENÇA,KAROLINE G.; OLEGARIO,JANAINE L.
The objective of this study was to evaluate the risk of feedlot finishing of steers (22.8 months) and young steers (15.2 months), using or not a correlation between the random input variables (data collected from 2004 to 2010) in the simulation of the Net Present Value (NPV) financial indicator. The animals were fed a diet containing roughage:concentrate ratio of 60:40 for 34 and 143 days, respectively, until they had reached a predetermined slaughter weight of 430 kg. For the NPV simulation, Latin Hypercube sampling was used, with 2000 interactions. The stochastic dominance analysis, test of differences between pairs of curves of cumulative distributions and sensitivity analysis were carried out. The NPV simulation using the correlation resulted in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Investment analysis; Investment projects; Monte Carlo simulation; Nonparametric statistics; Probabilistic analysis; Production of young bulls.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200945

Nematode larvae infecting Priacanthus arenatus Cuvier, 1829 (Pisces: Teleostei) in Brazil
Provedor de dados: 42
Autores: KURAIEM,BIANCA P.; KNOFF,MARCELO; FELIZARDO,NILZA N.; GOMES,DELIR C.; CLEMENTE,SÉRGIO C. SÃO.
From July to December, 2013, thirty Priacanthus arenatus specimens commercialized in the cities of Niterói and Rio de Janeiro, State of Rio de Janeiro, were acquired. The fish were necropsied and filleted to investigate the presence of nematode larvae. Twenty fish (66.7%) out of the total were parasitized by nematode larvae. A total of 2024 larvae were collected; among them, 30 third-instar larvae of Anisakis sp. showed prevalence (P) = 20%, mean abundance (MA) = 1, and the mean intensity (MI) = 5, and infection sites (IS) = caecum, stomach, liver, and mesentery; and 1,994 third-instar larvae (1,757 encysted and 237 free) of Hysterothylacium deardorffoverstreetorum with P = 66.7%, MA = 66.5, and MI = 99.7, and IS = spleen, caecum, stomach, liver,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anisakidae; Raphidascarididae; Priacanthus arenatus; Brazil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300857

The protective effects of β-sitosterol and vermicularin from Thamnolia vermicularis (Sw.) Ach. against skin aging in vitro
Provedor de dados: 42
Autores: HAIYUAN,YU; SHEN,XUEQING; LIU,DAN; HONG,MINHUA; LU,YANHUA.
Abstract: Aged skin, featured with dryness and wrinkles, has received mounting attention due to its adverse influences on beauty. β-Sitosterol and vermicularin are two common active ingredients of Thamnolia vermicularis (Sw.) Ach., a traditional Chinese medicine, of which the anti-aging effect has been discovered. Their protective performance against skin aging was assayed by co-culturing with skin cells in this work. Results showed that β-sitosterol promoted the biosynthesis of hyaluronic acid by increasing the expression of hyaluronic acid synthases in fibroblasts and enhanced the expression of skin barrier functional proteins including aquaporin 3, loricrin, filaggrin and involucrin in keratinocytes, which conduced to the moisture retention within skin....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-wrinkle; Moisturize; Β-sitosterol; Skin aging; Thamnolia vermicularis (Sw.) Ach.; Vermicularin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700623

Morphophysiological and biochemical alterations in Ricinus communis L. seeds submitted to cobalt60 gamma radiation
Provedor de dados: 42
Autores: LOPES,AMANDA M.; BOBROWSKI,VERA L.; SILVA,SERGIO D. DOS ANJOS E; DEUNER,SIDNEI.
ABSTRACT This study aimed to evaluate the radiosensitivity of castor bean seeds after applications of different doses of Cobalt60 gamma radiation. Seeds were pre-soaked for 24 hours in distilled water and then irradiated with 50, 100, 150, and 200 Gy, except the control. Sowing was performed in trays, which contained soil as substrate and were maintained in a greenhouse. The electrical conductivity, emergence, emergence speed index, growth parameters and activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, and catalase) were evaluated in the leaves and roots of castor bean seedlings. Gamma radiation did not affect the electrical conductivity of the seeds; however, at a dose of 200 Gy, the emergence and emergence speed index of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Castor bean; Radiosensitivity; Germination; Growth; Antioxidant enzymes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401925

Epidemiology of hepatitis B virus in the cities of the northern region of Espírito Santo, Brazil
Provedor de dados: 42
Autores: FONTES,ANDRÉ M.; ARDISSON,JULIANA S.; SOUZA,MARCO A.A.; FREITAS,RODRIGO R.; PANCOTO,JOÃO A.T.
ABSTRACT The World Health Organization (WHO) estimates that approximately 2 billion people worldwide have already had contact with hepatitis B virus (HBV) and 373 million have become chronic carriers. Hepatitis B is a major cause of chronic hepatitis, cirrhosis and hepatocellular carcinoma, leading to a large number of deaths annually. Both viral factors and the host immune response have been implicated in the pathogenesis and clinical result of HBV infection. Many Brazilian cities, including the cities of the northern region of the state of Espírito Santo are located in regions with little health infrastructure. Our study performed an epidemiological analysis of cases of Hepatitis B in São Mateus, using methodology of Geographic Information System (GIS),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatitis B; Epidemiology; Geoprocessing; Espírito Santo.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401549

Gonadal development in the freshwater crab Sylviocarcinus pictus (H. Milne Edwards, 1853) (Brachyura: Trichodactylidae) from the Guamá river, state of Pará, Brazil
Provedor de dados: 42
Autores: Silva,Leiliane S.; Martinelli-Lemos,Jussara M.; Ferreira,Maria Auxiliadora P.; Rocha,Rossineide M.
The development stages of male and female gonads in the freshwater crab Sylviocarcinus pictus (H. Milne Eduards, 1853) were described through macroscopic and microscopic (histology) examinations. The histological description was based on 40 specimens (20 each sex). Four gonadal development stages were found for females: immature, ripening, mature and spawned. The following female cells were found: ovogonia, oocytes in initial vitellogenesis, oocytes in advanced vitellogenesis, follicular cells and post-ovulatory follicles. Three development stages were found for males: immature, maturing and mature, with the indication of: spermatogonia, spermatocytes, spermatids, spermatozoids and spermatophores. These data suggest the pattern described in the literature....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon estuary; Gonadal histology; Reproduction.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300021

Cell damage and neurogenesis in the dentate granule cell layer of adult rats after pilocarpine- or kainate-induced status epilepticus
Provedor de dados: 42
Autores: Covolan,L.; Ribeiro,L.T.C.; Longo,B.M.; Mello,L.E.A.M.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100014

Mid- to Late-Holocene estuarine infilling processes studied by radiocarbon dates, high resolution seismic and biofacies at Vitoria Bay, Espirito Santo, Southeastern Brazil
Provedor de dados: 42
Autores: Bastos,Alex C.; Vilela,Claudia G.; Quaresma,Valéria S.; Almeida,Fabiana K.
Vitoria Bay is a 20 km long estuary, morphologically narrow, with a microtidal regime and, as other modern estuaries, was formed during the last post-glacial transgression. The estuarine bed morphology is characterised by a main natural channel limited by tidal flats with developed mangroves. Original radiocarbon dates were obtained for the site. Five radiocarbon ages ranging from 1,010 to 7,240 years BP were obtained from two sedimentary cores, which represent a 5 m thick stratigraphic sequence. The results indicate that, until about 4,000 cal. yrs BP, environmental conditions in Vitoria Bay were still of an open bay, with a free and wide connection with marine waters. During the last 4,000 yrs, the bay has experienced a major regression phase, by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: High-resolution seismic; Holocene estuarine evolution; Radiocarbon dating; Vitoria Bay; Biofacies.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300022

Genetic parameters for performance and carcass traits in a paternal 1 lineage of broiler
Provedor de dados: 42
Autores: CRUZ,VALDECY A.R.; GRUPIONI,NATALIA V.; MENDONÇA,GABRIELA G.; VENTURINI,GUILHERME C.; LEDUR,MONICA C.; PEIXOTO,JANE O.; MUNARI,DANISIO P.
Abstract  The objective of this study was to estimate variance components for performance and carcass traits in a paternal broiler line. The (co)variance components were estimated by the restricted maximum likelihood method applied to the animal model, including the fixed effect of group (sex and hatch) and additive genetic and residual as random effects. Estimated heritability for performance traits ranged from 0.09 to 0.42. The genetic correlations between traits ranged from -0.50 to 0.97. The heritability estimates of feed intake, weight gain, and feed conversion from 35 to 41 days of age were of low magnitude. The genetic correlations among them were favorable to genetic selection. These results suggest that moderate genetic gain can be obtained to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass; Feed conversion; Genetic correlation; Heritability; Weight gain.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201006

Critical analyses when modeling tree biomass to ensure additivity of its components
Provedor de dados: 42
Autores: BEHLING,ALEXANDRE; PÉLLICO NETTO,SYLVIO; SANQUETTA,CARLOS ROBERTO; CORTE,ANA PAULA D.; AFFLECK,DAVID L.R.; RODRIGUES,AURÉLIO L.; BEHLING,MARCOS.
ABSTRACT It is presented the theme additivity of biomass of tree components. To evaluate and discuss this context, experimental information collected in forests of Acacia mearnsii De Wild. was used. Equations for components (stem and crown) and total biomass were fitted by means of two procedures: 1) generalized nonlinear least squares and 2) weighted-nonlinear seemingly unrelated regressions. Analyzing the performance of the estimators, it can be concluded that the two tested procedures are equivalent. On the other hand, this conclusion differs when evaluated the consistency and efficiency of the estimators. Fitting equations for the components and for the total biomass by an independent way is not realistic, because from a biological point of view the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Biological consistency; Non-linear regression; System of equations.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401759

Production of crispy bread snacks containing chicken meat and chicken meat powder
Provedor de dados: 42
Autores: CAKMAK,HULYA; ALTINEL,BURAK; KUMCUOGLU,SEHER; KISLA,DUYGU; TAVMAN,SEBNEM.
ABSTRACT Chicken meat in two different forms (chicken meat and chicken meat powder) were added into white flour and whole wheat blend baguette bread formulations for protein enrichment and finally developing new and healthy snacks. The chicken meat and powder levels were 10% for white flour baguette, and 15% for whole wheat blend. The dried baguette samples were packaged under 100% N2, and physical, chemical, microbiological and sensorial properties were evaluated during 3 months of storage. Protein content of chicken meat powder added samples were found statistically higher than chicken meat added samples. Hardness of the snacks was significantly affected from type of chicken meat, such as values were higher for chicken meat added samples than chicken...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baguette; Chicken meat; Quality; Snack; Storage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602387

Are salty liquid food flavorings in vitro antitumor substances?
Provedor de dados: 42
Autores: CARVALHO,FRANCISCO R.S.; MOURA,ANTONIO G.; RODRIGUES,GARDENIA F.; NUNES,NARCIA M.F.; LIMA,DAISY J.B.; PESSOA,CLAUDIA; COSTA,MARCILIA P.; FERREIRA,PAULO M.P.; PERON,ANA PAULA.
ABSTRACT The objective of this study was to evaluate the antiproliferative, cytotoxic and genotoxic potential of salty liquid synthetic flavorings of Butter, Cheddar Cheese and Onion. The antiproliferative potential (2.9-1500 µg/mL) was assessed by MTT assay after 72h using the human tumor lines SF-295 (glioblastoma), OVCAR-8 (ovarian), HCT-116 (colon) and HL-60 (promyelocytic leukemia) and primary cultures of murine Sarcoma 180 (S180) and peripheral blood mononuclear cells (PBMC). Allium cepa bulbs were exposed to growing respective doses (1 mL and 2 mL). Only Butter and Cheddar flavorings revealed cytotoxic activity on cancer cells, with IC50 values ranging from 125.4 µg/mL (Cheddar - HCT-116) to 402.6 µg/mL (Butter - OVCAR-8). Butter flavoring was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food additives; Allium cepa; Antiproliferative action; Neoplasic cells; Toxicity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401419

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)
Provedor de dados: 42
Autores: OLIVEIRA,FÁBIO H.P.C. DE; ARA,ANDRÉ L.S. CAPELA E; MOREIRA,CESAR H.P.; LIRA,OSMAN O.; PADILHA,MARIA DO ROSÁRIO F.; SHINOHARA,NEIDE K.S.
This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coliforms; Cyanobacteria; Reservoir; Trophic state.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401863

Evaluation of embryotoxic and embryostatic effects of the aqueous extract of Rhizophora mangle and tannic acid on eggs and larvae of Aedes aegypti
Provedor de dados: 42
Autores: RODRIGUES NETO,AGEU A.; GOMES JÚNIOR,PLÍNIO P.; SILVA,MAURICIO C.; LIMA,CLÁUDIA S.A.; YARA,RICARDO; GUIMARÃES,EMÍLIA B.; SANTANA,EDUARDA S. DE; SILVA,LUZIA A. DA; LIRA,EDUARDO J.R.V. DE; VIEIRA,JEYMESSON R.C.
ABSTRACT Rhizophora mangle is an abundant plant in mangroves and tannic acid is a polyphenol produced by the secondary metabolism of plants. The aim of the study was to evaluate the embryotoxic and embriostatic effects of the aqueous extract of R. mangle and synthetic tannic acid on eggs and larvae of Aedes aegypti. A. aegypti eggs were exposed in duplicate at concentrations of 250, 500, 750 and 1000 µg/mL of extract and tannic acid for a period of 14 days. Mineral water was used as a negative control. The eggs were observed and counted in a stereomicroscope (1.2x). In all extract concentrations there was stimulation in hatching in relation to the control, but only in concentration of 750 mg/mL it was statistically significant. In tannic acid (250µg/ml)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Embryostatic; Embryotoxic; Rhizophora mangle; Tannic acid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502141

Polyaniline-silicon heterojunctions as a sensing device
Provedor de dados: 42
Autores: AZEVEDO,WALTER M.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300038

On complete spacelike hypersurfaces with constant scalar curvature in the de Sitter space
Provedor de dados: 42
Autores: BRASIL JR,ALDIR; COLARES,A. GERVASIO.
Let Mn be a complete spacelike hypersurface with constant normalized scalar curvature R in the de Sitter Space S1n + 1. Let H the mean curvature and suppose that &lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0045img1.gif" ALT="$ \overline{R}$"&gt; = (R - 1) &gt; 0 and &lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0045img1.gif" ALT="$ \overline{R}$"&gt; &lt;= sup H² &lt;= C&lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0045img3.gif" ALT="$\scriptstyle \overline{R}$"&gt;, where C&lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0045img3.gif" ALT="$\scriptstyle \overline{R}$"&gt; is a constant depending only on R and n. It is proved that either sup H² = &lt;img ALIGN="BOTTOM" BORDER="0"...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyperbolic cylinder; Spacelike hypersurfaces; De Sitter space.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400001

A diachronic view of the net longshore sediment drift during the Late Holocene at the Jequitinhonha River delta, Brazil, using numerical modeling
Provedor de dados: 42
Autores: Bittencourt,Abilio C.S.P.; Dominguez,José M.L.; Tanajura,Clemente A.S.; Silva,Iracema R.; Martin,Louis.
Using numerical modeling, this work estimates sediment dispersion patterns caused by the incidence of waves in five distinct coastline contours of the Jequitinhonha River delta plain during the Late Holocene. For this study, a wave cliate odel based on the construction of ave refraction diagras relative to the current boundary conditions as defined and assumed to be valid for the five coastlines. Numerical modeling from the refraction diagrams was carried out considering the angle of incidence and wave height along the coastline. This work has allowed us to reproduce past and current patterns of net longshore sediment drift defined by a conceptual model developed from the integration of sediment cores, aerial photograph interpretation, C14 datings and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Past and current longshore transport; Wave refraction; Numerical modeling; Holocene; Brazil.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400008

Ion microprobe (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil
Provedor de dados: 42
Autores: HARTMANN,LÉO A.; SANTOS,JOÃO O. S.; McNAUGHTON,NEAL J.; VASCONCELLOS,MARCOS A. Z.; DASILVA,LUIZ C.
Complex polymetamorphic granulites have been dated in the Santa Catarina granulite complex of southern Brazil through SHRIMP study of zircon. This complex is dominated by intermediate-acid plutonic rocks and contains small volumes of mafic and ultramafic rocks, and minor quartzite and banded iron formation. Porphyroblasts of orthopyroxene, clinopyroxene and plagioclase in mafic and acid rocks are interpreted as magmatic remnants in a volumetrically dominant granoblastic aggregate (M1) of the same minerals and hornblende. Hornblende formed during a later M2 metamorphic event constitutes rims around pyroxene, but the hornblende is also rimmed by granoblastic simplectites of orthopyroxene, clinopyroxene, hornblende and plagioclase in a second granulite facies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Granulites; SHRIMP; U/Pb geochronology; Santa Catarina granulite complex; Brazil; Symplectites; Zircon.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400007

Neurohumoral activation in heart failure: the role of adrenergic receptors
Provedor de dados: 42
Autores: Brum,Patricia C.; Rolim,Natale P.L.; Bacurau,Aline V.N.; Medeiros,Alessandra.
Heart failure (HF) is a common endpoint for many forms of cardiovascular disease and a significant cause of morbidity and mortality. The development of end-stage HF often involves an initial insult to the myocardium that reduces cardiac output and leads to a compensatory increase in sympathetic nervous system activity. Acutely, the sympathetic hyperactivity through the activation of beta-adrenergic receptors increases heart rate and cardiac contractility, which compensate for decreased cardiac output. However, chronic exposure of the heart to elevated levels of catecholamines released from sympathetic nerve terminals and the adrenal gland may lead to further pathologic changes in the heart, resulting in continued elevation of sympathetic tone and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heart failure; Sympathetic nervous system; Adrenergic receptors.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300009

Timing and placement of cattle manure and/or gliricidia affects cotton and sunflower nutrient accumulation and biomass productivity
Provedor de dados: 42
Autores: PRIMO,DÁRIO C.; MENEZES,RÔMULO S.C.; OLIVEIRA,FABIO F. DE; DUBEUX JÚNIOR,JOSÉ CARLOS B.; SAMPAIO,EVERARDO V.S.B.
ABSTRACT Organic fertilizers are a viable alternative to increase oilseed productivity in family agriculture systems. The study aimed to evaluate the effects of timing and placement of cattle manure and/or gliricidia (Gliricidia sepium Jacq. Walp) prunings on cotton (Gossipium hirsutum L.) and sunflower (Helianthus annuus L.) nutrient accumulation and biomass productivity. Experiments were carried out in 2010 and 2011 in Taperoá, Paraíba, Brazil. The organic fertilization treatments were: GI - gliricidia incorporated before planting; GS - gliricidia applied on surface 45 days after planting (DAP); MI + GI - manure and gliricidia incorporated before planting; MI + GS - manure incorporated before planting and gliricídia applied on the surface 45 DAP; MI -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Gossypium hirsutum L.; Green manure; Nutrients; Productivity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100415

Hippocampal distribution of IL-1β and IL-1RI following lithium-pilocarpine-induced status epilepticus in the developing rat
Provedor de dados: 42
Autores: Álvarez-Croda,Dulce-Mariely; Santiago-García,Juan; Medel-Matus,Jesús S.; Martínez-Quiroz,Joel; Puig-Lagunes,Angel A.; Beltrán-Parrazal,Luis; López-Meraz,María-Leonor.
The contribution of Interleukin-1β (IL-1β) to neuronal injury induced by status epilepticus (SE) in the immature brain remains unclear. The goal of this study was to determine the hippocampal expression of IL-1β and its type 1 receptor (IL-1RI) following SE induced by the lithium-pilocarpine model in fourteen-days-old rat pups; control animals were given an equal volume of saline instead of the convulsant. IL-1β and IL-1RI mRNA hippocampal levels were assessed by qRT-PCR 6 and 24 h after SE or control conditions. IL-1β and IL-1RI expression was detected in the dorsal hippocampus by immunohistochemical procedures; Fluoro-Jade B staining was carried out in parallel sections in order to detect neuronal cell death. IL-1β mRNA expression was increased 6 h...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Developing rat; IL-1β; IL-1RI; Hippocampus; Status epilepticus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200653

The Serra da Graciosa A-type granites and syenites, southern Brazil. Part 1: regional setting and geological characterization
Provedor de dados: 42
Autores: Gualda,Guilherme A.R.; Vlach,Silvio R.F.
The Serra da Graciosa region includes important occurrences of granites and syenites of the Graciosa A-type Province (formerly Serra do Mar Suite), southern Brazil. Using fieldwork, petrography, and remote sensing imagery, we characterize the geology of the plutons in the region. Five individual plutons were recognized. Two correspond to the previously defined Marumbi and Anhangava Plutons. We divide the former "Graciosa Pluton" into three new plutons: Capivari, Órgãos, and Farinha Seca. The plutons are elliptical with northeast-southwest orientation. Two petrographic associations can be recognized: an alkaline association that includes peralkaline and metaluminous hypersolvus alkalifeldspar granites and syenites (Anhangava, Farinha Seca, Órgãos), and an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Serra da Graciosa; A-type granites and syenites; Graciosa Province; Paraná State.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300006

Bioactivity and action mechanism of green propolis against Pythium aphanidermatum
Provedor de dados: 42
Autores: PAZIN,WALLANCE M.; SANTOS,SUIKINAI N. DOS; QUEIROZ,SONIA C.N.; BAGATOLLI,LUIS A.; SOARES,ADEMILSON E.E.; MELO,ITAMAR S. DE; ITO,AMANDO S.
Abstract: We have established how natural compounds from green propolis collected by the species Apis mellifera act against the growth of Pythium aphanidermatum. On the basis of mass spectrometry (Q-ToF MS), we determined that Artepillin C, the major constituent of green propolis, underlies the effect and displays activity against P. aphanidermatum at a minimal inhibitory concentration of 750 µg.mL-1. Biophysical studies based on model membranes showed that this inhibitory effect may be linked with a membrane-related phenomenon: Artepillin C increases the permeability of membranes with relatively high fluidity in their lateral structure, a feature that is in line with the lipid composition reported for the cytoplasmic membrane of P. aphanidermatum....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green propolis; Artepillin C; Fungicide; Pythium aphanidermatum; Model membranes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300617

Phosphorus dynamics in a highly polluted urban drainage channel-shallow reservoir system in the Brazilian semiarid
Provedor de dados: 42
Autores: ARAÚJO,GERMÁRIO M.; LIMA NETO,IRAN E.; BECKER,HELENA.
Abstract: This paper investigates phosphorus dynamics in a highly polluted system composed of a drainage channel followed by a shallow reservoir in the city of Fortaleza, Brazilian semiarid. During the dry season, significant non-point source loads of total phosphorus originated from residences unconnected to sewers were identified along the channel, resulting in an increasing flow rate of untreated sewage towards the reservoir. During the rainy season, as a consequence of dilution, phosphorus concentrations decreased by about 5-fold. The results also revealed that the reservoir was acting similarly to a waste stabilization pond, with phosphorus removal efficiency of about 33%. Assuming one-dimensional flow for the channel and complete mixing for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffuse pollution; Eutrophication; Nutrients; Semiarid; Urbanization; Water quality modeling.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500902

Production, extraction and characterization of exopolysaccharides produced by the native Leuconostoc pseudomesenteroides R2 strain
Provedor de dados: 42
Autores: Paulo,Elinalva M.; Boffo,Elisangela F.; Branco,Alexsandro; Valente,Ângela M.M.P.; Melo,Itamar S.; Ferreira,Antonio G.; Roque,Milton R.A.; Assis,Sandra A. de.
The genus Leuconostoc belongs to a group of lactic acid bacteria usually isolated from fermented vegetables, which includes species involved in the production of exopolysaccharides (EPS). These biopolymers possess considerable commercial potential. Because of the wide variety of industrial applications of EPS, this study aimed to produce and characterize the native exopolysaccharide strain Leuconostoc pseudomesenteroides R2, which was isolated from cabbage collected in a semi-arid region of Bahia. We employed the following conditions for the production of EPS: 10.7% sucrose, pH 8.2, without agitation and incubation at 28ºC for 30 hours. The fermentation broth was treated with ethanol and generated two types of polysaccharide substances (EPS I and EPS II)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leuconostoc pseudomesenteroides; Exopolysaccharide; Polymer; Dextran.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200018

Correlation between radiation dose and p53 protein expression levels in human lymphocytes
Provedor de dados: 42
Autores: CAVALCANTI,MARIANA B.; FERNANDES,THIAGO S.; SILVA,EDVANE B.; AMARAL,ADEMIR.
The aim of this research was to evaluate the relationship between p53 protein levels and absorbed doses from in vitro irradiated human lymphocytes. For this, samples of blood from 23 donors were irradiated with 0.5; 1; 2; and 4 Gy from a Cobalt-60 source, and the percentages of lymphocytes expressing p53 were scored using Flow Cytometry. The subjects were divided into 3 groups, in accordance with the p53 levels expressed per radiation dose: low (Group I), high (Group II), and excessive levels (Group III). For all groups, the analyses showed that the p53 expression levels increase with the absorbed dose. Particularly for groups I and II, the correlation between this protein expression and the dose follows the linear-quadratic model, such as for radioinduced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological Dosimetry; Cellular radiobiology; Flow Cytometry; P53 protein; Radiosensitivity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401783

Constraints to the implementation of effective environmental management in coastal areas of developing countries
Provedor de dados: 42
Autores: Wagener,Angela de L.R.
This paper addresses the limitations the scarcity of reliable scientific information poses to the implementation of effective and sustainable coastal management programmes in developing countries. Alternatives to the current monitoring approaches are suggested as to improve information level on the state of the environment and to decrease data gap on past conditions. The paper aims at encouraging the redesign of monitoring practices in developing countries as to be ground on the best actual scientific knowledge.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal management; Scientific information; Environmental indicators; Monitoring; Developing countries.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400004

Productive potential of cassava plants (Manihot esculenta Crantz) propagated by leaf buds
Provedor de dados: 42
Autores: NEVES,REIZALUAMAR J.; DINIZ,RAFAEL P.; OLIVEIRA,EDER J. DE.
ABSTRACT New techniques of rapid multiplication of cassava (Manihot esculenta Crantz) have been developed, requiring technical support for large-scale use. This work main to evaluate the agronomic performance of plantlets obtained by leaf buds technique against stem cuttings in the field conditions. The work was conducted using the randomized block design in a factorial scheme with 3 varieties (BRS Kiriris, 98150-06, 9624-09) × 4 origins of the plantlets (conventional - stem cuttings of 20 cm length, leaf buds of the upper, middle and inferior stem part) × 2 agrochemicals (control and treated). There was a remarkable decrease in some agronomic traits that ranged from 23% (number of branches) to 62% (shoot weight) when using leaf buds plantlets. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propagation; Vigor; Field conditions; Root production.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401733

Nutritional value of banana inflorescences, study about transfer mechanisms of iron across the placenta, and new cytogenetic studies of Lippia (Verbenaceae) species from Brazil
Provedor de dados: 42
Autores: Kellner,Alexander W. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400001

Minimum free energy predicted base pairing in the 39 nt spliced leader and 5’ UTR of calmodulin mRNA from Trypanosoma cruzi: influence of the multiple trans-splicing sites
Provedor de dados: 42
Autores: SAMUDIO,FRANKLYN; BRANDÃO,ADEILTON.
ABSTRACT We analyzed the compositional changes and the stable base pairs in the predicted secondary structure of the 5’ UTR calmodulin mRNA in T. cruzi. The three copies of calmodulin in T. cruzi genome display variable position of the trans splicing sites and give rise to several mRNA that differs slightly on 5’ UTR composition in the epimastigote stage. We show that the pattern of high probability base pairs in the minimum free energy predicted secondary structures of the calmodulin 5’ UTR remains unchanged despite the nucleotide composition variation. However, the 39 nt spliced leader (mini-exon, the 5’ exon sequence transferred to trypanosome mRNAs by the mechanism of trans splicing) shows a variable pattern of high and low probability base pairing as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trans-splicing; Untranslated region; Calmodulin; Epimastigote; RNA secondary structure; Minimum free energy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502311

Structural control over well productivity in the Jundiaí River Catchment, Southeastern Brazil
Provedor de dados: 42
Autores: Neves,Mirna A.; Morales,Norberto.
The well productivity in crystalline terrains is extremely changeable and depends on external factors, in addition to the intrinsic properties of rocks. In the Jundiaí River Catchment, Southeastern Brazil, the main factor that influences well productivity is the existence of open discontinuities permeability in geologic environments that favor groundwater recharge. In that area, Pre-Cambrian shear and fault zones were reactivated throughout geologic time, controlling the morphostructural compartments and the Cenozoic sedimentary deposition. Superposition of productivity data and structural maps showed that more productive wells are concentrated mainly along the regional geologic structures. The structural control over well productivity is also noticeable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Groundwater; Crystalline rocks; Tectonics; Jundiaí; Southeastern Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200012

In vitro antioxidant capacity of tea of Echinodorus grandiforus, “leather hat,” in Wistar rat liver
Provedor de dados: 42
Autores: LUNARDI,RAFAELA F.; WOHLENBERG,MARIANE; MEDEIROS,NIARA; AGOSTINI,FABIANE; FUNCHAL,CLÁUDIA; DANI,CAROLINE.
Oxidative stress has been considered as one of the factors responsible for hepatic diseases, which sometimes require new ways of treatment. The present study aimed to evaluate the in vitro antioxidant capacity of the tea of Echinodorus grandiforus (“leather hat” plant) in rat liver. Different preparations of tea were evaluated for phenolic composition, antioxidant activity by DPPH assay and ability to inhibit lipid peroxidation induced by copper sulfate. The antioxidant activity was assessed in liver tissue treated with sodium azide in the presence or absence of tea by assays for lipid peroxidation (TBARS), protein oxidation (carbonyl) and the antioxidant enzymes catalase (CAT) and superoxide dismutase (SOD). The results show that different preparations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxidative stress; Phenolic compounds; Reactive species; Sodium azide.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301451

Chlorophyll fluorescence varies more across seasons than leaf water potential in drought-prone plants
Provedor de dados: 42
Autores: ROSADO,BRUNO H.P.; MATTOS,EDUARDO A. DE.
ABSTRACT Among the effects of environmental change, the intensification of drought events is noteworthy, and tropical vegetation is predicted to be highly vulnerable to it. However, it is not clear how tropical plants in drought-prone habitats will respond to this change. In a coastal sandy plain environment, we evaluated the response of six plant species to water deficits across seasons, the relationship between their morpho-physiological traits, and which traits would be the best descriptors of plants' response to drought. Regardless of leaf succulence and phenology, responses between seasons were most strongly related to chlorophyll fluorescence. In this study we have demonstrated that a better comprehension of how tropical species from drought-prone...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Functional traits; Plant-water relations; Photoinhibition; Seasonal habitats.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200549

The quantification of testicular cells during the postnatal development in two Caviomorph rodents: the guinea pig (Cavia porcellus) and the cutia (Dasyprocta agouti)
Provedor de dados: 42
Autores: SIMÕES,LUCIANA S.; SASAHARA,TAIS H.C.; FAVARON,PHELIPE O.; MARQUES JÚNIOR,RICARDO; OLIVEIRA,MOACIR F. DE; MACHADO,MÁRCIA R.F.; MIGLINO,MARIA ANGELICA.
ABSTRACT The germinative, Sertoli and Leydig cells of two caviomorph rodents (Cavia porcellus and Dasyprocta agouti) were counted as well as the estimation of the total volume of the testis and the total volume of seminiferous tubules and interstitium in prepubertal, pubertal and adult animals. The number of spermatogonia, spermatocytes and spermatids cells increased during the pubertal phase in both rodents, notably the spermatid cells. The spermatocyte and spermatid slightly decreased in the adult of both rodents, but the increment in spermatogonia cells number was seen, mainly in cutias. The number of Sertoli cells increased in pubertal rodents, but in the adult the number reduced. Substantial number of Leydig cells was counted in pubertal and adult...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinative cells; Hystricomorpha; Reproduction; Stereology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401745

E Schistosoma mansoni at the molecular and cellular biology of helminth parasites VI meeting
Provedor de dados: 42
Autores: Verjovski-Almeida,Sergio.
Tipo: Info:eu-repo/semantics/article
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200001

Effects of fed mycotoxin contaminated diets supplemented with spray-dried porcine plasma on cholinergic response and behavior in piglets
Provedor de dados: 42
Autores: MÜLLER,LUCIELI K.F.; SILVA,ALEKSANDRO S. DA; BOTTARI,NATHIELI B.; SANTURIO,JANIO M.; MORSCH,VERA M.; PIVA,MANOELA M.; MENDES,RICARDO E.; GLORIA,EDUARDO M.; PAIANO,DIOVANI.
Abstract: The aim of this study was to evaluate the effect of spray-dried porcine plasma (SDPP) supplementation on cholinesterase enzymes and its relationship with animal behavior of weaning piglets exposed to mycotoxin contaminated diets. To achieve these objectives, two experimental design approaches were used. Male piglets (7.15±0.61kg) were allocated in four groups: CTL group received a regular diet; SDPP group received a regular diet and 6% SDPP; MYC group received a diet containing desired contamination of 210 µg/kg aflatoxins and 6.690 µg/kg fumonisins; group MYC+SDPP received 253 µg/kg aflatoxins, 6930 µg/kg fumonisins and 6% SDPP. The animals treated with mycotoxin co-contaminated diets showed an increase in AChE and BChE activities in peripheral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycotoxin; Acetylcholinesterase; Brain; Spray-dried porcine plasma; Animal health.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300807

Seasonal effects of wastewater to the water quality of the Caeté river estuary, Brazilian Amazon
Provedor de dados: 42
Autores: Pereira,Luci C.C.; Monteiro,Marcela C.; Guimarães,Danielly O.; Matos,Jislene B.; Costa,Rauquírio M. da.
Bragança's socioeconomic situation is highly dependent on estuarine and marine biological resources that are influenced by tidal cycles and climatology. Field measurements (hydrological, hydrodynamic and microbiological variables) were taken in the most urbanized zone from Caeté estuary to characterise the quality of the local environment. During the dry period, the estuary was more eutrophic and presented the highest temperature (30.5 °C in Oct./06), salinity (17 psu in Feb./07), pH (8.24 in Feb./07) and fecal coliform (&gt; 1000 MPN/100 ml in Dec./06 and Feb./07) values. The phytoplankton Cyclotella meneghiniana, Coscinodiscus centralis and other r-strategist species were observed. The lack of basic hydric canalization was responsible for the local...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equatorial estuary; Temporal variation; Eutrophication; Northern Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200022

On a fossil lobster (Decapoda, Malacostraca, Crustacea) from the Riachuelo Formation, Albian of the Sergipe Basin, Brazil
Provedor de dados: 42
Autores: TURBAY,CAIO V.G.; CESERO,PEDRO; KOUTSOUKOS,EDUARDO A.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200013

Methylation-GC-MS analysis of arabinofuranose- and galactofuranose-containing structures: rapid synthesis of partially O-methylated alditol acetate standards
Provedor de dados: 42
Autores: Sassaki,Guilherme L.; Iacomini,Marcello; Gorin,Philip A.J.
Arabinose and galactose were treated with MeOH containing traces of H2SO4 or HCl at 25ºC to give mixtures of their methyl alpha- and beta-furanosides, as shown by 1D and 2D nuclear magnetic resonance (NMR). Oxidation of the Me alpha,beta-Araf mixture with NaIO4 preferentially oxidised the beta-isomer, to give pure Me alpha-Araf . Each product was progressively O-methylated using the Purdie reagent (MeI/Ag2O) at 25ºC and resulting mixtures of partially methylated glycosides (PMGs) were rapidly assayed by thin layer chromatography (TLC) first to favour higher yields of mono-O-methyl derivatives and later for products with higher degrees of methylation. The products were converted to complex mixtures of partially O-methylated alditol acetate derivatives...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Partially O-methylated alditol acetates; GC-MS standards; Purdie methylation; OH reactivity; NMR.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200003

Heavy metal concentrations in soils from a remote oceanic island, Fernando de Noronha, Brazil
Provedor de dados: 42
Autores: Oliveira,Sonia M.B. de; Pessenda,Luiz C.R.; Gouveia,Suzy E.M.; Favaro,Deborah I.T.
This paper examines the role of parent rock, pedogenetic processes and airborne pollution in heavy metal accumulation in soils from a remote oceanic island, Fernando de Noronha, Brazil. We studied five soil profiles developed from different volcanic rocks. Mineralogical composition and total concentrations of major and trace elements were determined in 43 samples. The obtained concentrations range for heavy metals were: Co: 26-261 ppm; Cu: 35-97 ppm; Cr: 350-1446 ppm; Ni: 114-691 ppm; Zn: 101-374 ppm; Hg: 2-150 ppb. The composition of soils is strongly affected by the geochemical character of the parent rock. Pedogenesis appears to be responsible for the accumulation of Zn, Co, and, to a lesser extent, of Ni and Cu, in the upper, Mn- and organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Soils; Anthropogenic mercury; Fernando de Noronha.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400007

Butia capitata (Mart.) Becc. lamina anatomy as a tool for taxonomic distinction from B. odorata (Barb. Rodr.) Noblick comb. nov (Arecaceae)
Provedor de dados: 42
Autores: SANT'ANNA-SANTOS,BRUNO F.; CARVALHO JÚNIOR,WELLINGTON G.O.; AMARAL,VANESSA B.
The distinction between Butia capitata and B. odorata is based only on a few morphological characteristics, therefore there is a need for additional studies for supporting the separation of the species. As lamina anatomy characteristics are relevant in circumscribing Arecaceae taxa, this work aimed to describe B. capitata lamina anatomy and compare it with B. odorata. Samples from the middle portion of the pinnae were collected and processed in accordance with standard plant anatomy techniques. The epidermis is uniseriate and composed of a thick cuticle and epicuticular waxes into like hooked filaments. The subsidiary cells that arch over the guard cells are located at the hypodermis. The mesophyll is isobilateral and compact. The vascular bundles are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant anatomy; Palms; Raphides; Taxonomy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100071

Macro and microphytofossils study of the Itararé Subgroup at Km 96 of Bandeirantes highway, Campinas municipality, SP
Provedor de dados: 42
Autores: AMARAL,PAULA G. C.; RICARDI-BRANCO,FRESIA; SOUZA,PAULO A. DE; BERNARDES-DE-OLIVEIRA,MARY E. C.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300015

Inventary of the Sponge Fauna of the cemitério Paleolake, Catalão, Goiás, Brazil
Provedor de dados: 42
Autores: Machado,Vanessa de Souza; Volkmer-Ribeiro,Cecilia; Iannuzzi,Roberto.
The Cemitério Paleolake, Catalão, Goiás, is a lacustrine deposit that is rich in spicules of continental sponges. These spicules, which are present in three sections (1-3), were analyzed for the taxonomic identification of the species in order to reconstruct the late Quaternary palaeoenvironment. An indigenous assemblage of lentic sponges was found, consisting of Metania spinata (Carter 1881), Dosilia pydanieli Volkmer-Ribeiro (1992), Radiospongilla amazonensis Volkmer-Ribeiro and Maciel (1983), Trochospongilla variabilis Bonetto and Ezcurra de Drago (1973), Corvomeyenia thumi (Traxler 1895), Heterorotula fistula Volkmer-Ribeiro and Motta (1995), plus Corvoheteromeyenia australis (Bonetto and Ezcurra de Drago 1966), which here has its first record in an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado Biome; Continental sponges; Quaternary paleointerpretations; Sediments; Spicules.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100004

Some reflections on science, industry and education
Provedor de dados: 42
Autores: GENNES,PIERRE G. DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100001

Mesothelin as a biomarker for ovarian carcinoma: a meta-analysis
Provedor de dados: 42
Autores: MADEIRA,KRISTIAN; DONDOSSOLA,EDUARDO R.; FARIAS,BRUNA F. DE; SIMON,CARLA S.; ALEXANDRE,MARIA C.M.; SILVA,BRUNO R.; ROSA,MARIA INÊS.
The objective of this work was to estimate the accuracy of mesothelin as a biomarker for ovarian cancer. A quantitative systematic review was performed. A comprehensive search of the Medline, LILACS, SCOPUS, Embase, Cochrane Central Register of Controlled Trials, Biomed Central, and ISI Web of Science databases was conducted from January 1990 to June 2015. For inclusion in this systematic review, the papers must have measured mesothelin levels in at least two histological diagnoses; ovarian cancer (borderline or ovarian tumor) vs. benign or normal ovarian tissue. For each study, 2 x 2 contingency tables were constructed. We calculated the sensitivity, specificity and diagnostic odds ratio. The verification bias was performed according to QUADAS-2....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovarian tumors; Mesothelin; Meta-analysis; Biomarker; Statistical.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300923

Abeta(1-42) induces abnormal alternative splicing of tau exons 2/3 in NGF-induced PC12 cells
Provedor de dados: 42
Autores: LAGUNES,TERESA; HERRERA-RIVERO,MARISOL; HERNÁNDEZ-AGUILAR,MARÍA ELENA; ARANDA-ABREU,GONZALO E.
Protein tau plays a pivotal role in the pathophysiology of Alzheimer's disease, where its hyperphos-phorylation promotes aggregation and microtubule destabilization. Tau undergoes alternative splicing which generates six isoforms in the human brain, due to inclusion/exclusion of exons 2, 3 and 10. Dysregulation of the splicing process of tau exon 10 is sufficient to cause tauopathy and has shown to be influenced by beta-amyloid peptides, but splicing of other exons is less studied. We studied the effects of beta-amyloid(42) in the alternative splicing of tau exons 2/3 and 6, using untreated and Nerve Growth Factor-induced PC12 cells. Beta-amyloid exposure caused formed cell processes to retract in differentiated cells and altered the expression of exons...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alzheimer's disease; Amyloid peptide; Splicing regulation; Tau isoforms.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401927

Acetone extract from Streptoverticillium sp., a bacterium isolated from Brazilian Cerrado soil, induces anti-inflammatory activity in mice
Provedor de dados: 42
Autores: CRUZ,RODRIGO B. DA; GALDINO,PABLINNY M.; PENNA,KARLLA G.B.D.; HOFFMANN,KAREN; COSTA,ELSON A.; BATAUS,LUIZ A.M.
The Streptoverticillium sp. Z1 is an actinomycete isolated from the soil under Cerrado vegetation, the extract of this strain was investigated in nociceptive and inflammatory models. The Streptoverticillium extract (ExS) 50 and 100 mg/kg (s.c.) produced a significant inhibition of acetic acid-induced abdominal writhings thereby demonstrating an anti-nociceptive effect. In the tail flick test the ExS (s.c.) was inactive. This result implited that ExS does not contain opioid-like compounds with central analgesic properties. In the inflammatory models, ExS 100 and 200 mg/kg (s.c.) were able to inhibit the croton oil-induced ear edema and, ExS 200 and 500 mg/kg (s.c.) inhibited the leukocyte migration on the carrageenan-induced peritonitis. The phospholipase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptoverticillium; Anti-inflammatory effect; Nociceptive and inflammatory models; Phospholipase A2 activity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200595

Storm surge modeling and forecast for the South-Western Atlantic Ocean
Provedor de dados: 42
Autores: Camargo,Ricardo de; Harari,Joseph; Dias,Pedro L.S.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200013

Fitting mathematical models to lactation curves from holstein cows in the southwestern region of the state of Parana, Brazil
Provedor de dados: 42
Autores: Ferreira,Abílio G.T.; Henrique,Douglas S.; Vieira,Ricardo A.M.; Maeda,Emilyn M.; Valotto,Altair A.
The objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Milk yield; Mathematical models selection; Non-linear models.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503

Evidences of delayed size recovery in Araucaria angustifolia populations after post-glacial colonization of highlands in Southeastern Brazil
Provedor de dados: 42
Autores: Stefenon,Valdir M.; Behling,Hermann; Gailing,Oliver; Finkeldey,Reiner.
Up to date, little is known about the relationship between historical demography and the current genetic structure of A. Angus As a first effort towards overcoming this lack, microsatellite data scored in six populations and isozyme allele frequencies published for 11 natural stands of this species were analysed in order to assess molecular signatures of populations' demographic history. Signatures of genetic bottlenecks were captured in all analysed populations of southeastern Brazil. Among southern populations, signatures of small effective population size were observed in only three out of 13 populations. Southern populations likely experienced faster recovery of population size after migration onto highlands. Accordingly, current genetic diversity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Genetic bottleneck; Population size recovery; Demographic history; Climate dynamics; Paleobotany.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300005

The phase portrait of the Hamiltonian system associated to a Pinchuk map
Provedor de dados: 42
Autores: ARTÉS,JOAN CARLES; BRAUN,FRANCISCO; LLIBRE,JAUME.
Abstract In this paper we describe the global phase portrait of the Hamiltonian system associated to a Pinchuk map in the Poincaré disc. In particular, we prove that this phase portrait has 15 separatrices, five of them singular points, and 7 canonical regions, six of them of type strip and one annular.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Center; Global injectivity; Real Jacobian conjecture; Pinchuk map.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602599

The Qualis system: a perspective from a multidisciplinary journal
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401339

Genetic structure from the oldest Jatropha germplasm bank of Brazil and contribution for the genetic improvement
Provedor de dados: 42
Autores: SANTOS,DALILHIA N. DOS; FERREIRA,JULIANO L.; SETOTAW,TESFAHUN A.; CANÇADO,GERALDO M.A.; PASQUAL,MOACIR; LONDE,LUCIANA C.N.; SATURNINO,HELOISA M.; VENDRAME,WAGNER A.
ABSTRACT Jatropha is a potential oilseed crop, which requires mitigating factors such as the low genetic variability of the species. The solution runs through the research of Brazilian germplasm. Attention should be given to the germplasm of jatropha the north of Minas Gerais, because this is the oldest national collection and because this region may be a regions of jatropha diversity due to selection pressure arising from environmental adversities. Therefore, the objective of this study was to investigate the genetic diversity of 48 accessions of collection from Empresa de Pesquisa Agropecuária de Minas Gerais (EPAMIG), using SSR and ISSR markers. The results showed low genetic diversity, but some individuals stood out as J. mollissima (48), J. podagrica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic diversity; Jatropha curcas; Molecular markers; Oilseed crop.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602363

Evaluation of the mutagenic effect of the iodinated contrast medium Urografina® 292 using the micronucleus test in mouse bone marrow cells
Provedor de dados: 42
Autores: BELLE,MONICA B.B.; LEFFA,DANIELA D.; MAZZORANA,DALIANE; ANDRADE,VANESSA M. DE.
Contrast media (CM) are frequently used in diagnostic radiology and in radiotherapy as a diagnostic tool and in treatment planning. Previous studies have demonstrated that these compounds induce chromosomal aberrations. This study evaluates the mutagenic effects induced by the contrast medium Urografina® 292 (meglumine amidotrizoate and sodium-ionic dimmer) in bone marrow cells (BMC) of mice in vivo. Micronuclei assay was performed in BMC of CF-1 mice injected with CM 1.5 and 3.0 mL/kg intravenous doses and 1.0, 2.0, 3.0 mL/kg intraperitoneal doses. The animals were beheaded 24 h after treatment by cervical dislocation, and femur BMC from each animal were used in the micronucleus test. The group treated with the highest intravenous injection of Urografina®...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Contrast medium; Micronuclei; Urografina® 292.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200737

Polychlorinated Biphenyl (PCB) congener concentrations in aquatic birds. Case study: Ilha Grande Bay, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: FERREIRA,ALDO PACHECO.
Livers from 108 birds found prostrate or dead in Ilha Grande Bay between 2005 and 2010 were analyzed for 16 PCB congeners (IUPAC numbers 8, 18, 28, 31, 52, 77, 101, 118, 126, 128, 138, 149, 153, 169, 170, and 180). The species analyzed were Egretta caerulea(Linnaeus 1758), Nycticorax nycticorax (Linnaeus 1758),Egretta thula (Molina 1782), and Ardea cocoi(Linnaeus 1766). The analysis were performed using Origin software (7.5, 2004) with a significant level of p&lt;0.05. Data were checked for adherence to the standard assumptions of parametric tests using the Kolmogorov-Smirnov test for normality and the Levene's test for homogeneity of variances. This has revealed differences in concentration for some congeners. Results indicate relatively low PCBs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Ilha Grande Bay; Polychlorinated biphenyl; Risk to environment and health; Aquatic birds.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401379

A dinosaur ilium from the Late Triassic of Brazil with comments on key-character supporting Saturnaliinae
Provedor de dados: 42
Autores: GARCIA,MAURÍCIO S.; PRETTO,FLÁVIO A.; DIAS-DA-SILVA,SÉRGIO; MÜLLER,RODRIGO T.
Abstract: Discoveries in Carnian-aged rocks are establishing a rich and diverse dinosaurian fauna at the so-called ‘dawn of the age of dinosaurs’ in the Late Triassic of Western Gondwana. Accordingly, Brazilian strata from the Candelária Sequence have contributed extensively to this trend. Here, we present a new dinosaurian specimen (CAPPA/UFSM 0200) from this geological unit. The material was collected at a fossiliferous site that had no previous record of dinosaurs. Our specimen comprises a single ilium, which we describe in detail. Its anatomy is consistent with Carnian sauropodomorph dinosaurs, but differs from coeval specimens by several features, although we do not discard the possibility of these features being the result of intraspecific variation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intraspecific variation; Saurischia; Sauropodomorpha; Upper Triassic; Western Gondwana.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400516

A glimpse on biological activities of tellurium compounds
Provedor de dados: 42
Autores: Cunha,Rodrigo L. O. R.; Gouvea,Iuri E.; Juliano,Luiz.
Tellurium is a rare element which has been regarded as a toxic, non-essential trace element and its biological role is not clearly established to date. Besides of that, the biological effects of elemental tellurium and some of its inorganic and organic derivatives have been studied, leading to a set of interesting and promising applications. As an example, it can be highlighted the uses of alkali-metal tellurites and tellurates in microbiology, the antioxidant effects of organotellurides and diorganoditellurides and the immunomodulatory effects of the non-toxic inorganic tellurane, named AS-101, and the plethora of its uses. Inasmuch, the nascent applications of organic telluranes (organotelluranes) as protease inhibitors and its applications in disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumorals; Biological applications; Enzyme inhibitors; Organotellurium; Proteases; Tellurium.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300006

c-AMP-mediated changes in the intracellular distribution of the myelin-related protein CNPase in olfactory ensheathing glia (OEG)
Provedor de dados: 42
Autores: SANTOS-SILVA,ALESSANDRA; CAVALCANTE,LENY A.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300020

A new world natural vegetation map for global change studies
Provedor de dados: 42
Autores: Lapola,David M.; Oyama,Marcos D.; Nobre,Carlos A.; Sampaio,Gilvan.
We developed a new world natural vegetation map at 1 degree horizontal resolution for use in global climate models. We used the Dorman and Sellers vegetation classification with inclusion of a new biome: tropical seasonal forest, which refers to both deciduous and semi-deciduous tropical forests. SSiB biogeophysical parameters values for this new biome type are presented. Under this new vegetation classification we obtained a consensus map between two global natural vegetation maps widely used in climate studies. We found that these two maps assign different biomes in ca. 1/3 of the continental grid points. To obtain a new global natural vegetation map, non-consensus areas were filled according to regional consensus based on more than 100 regional maps...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural vegetation; Tropical forest; Biome; Phytogeography; Biogeophysical parameters; Vegetation map.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200017

Periodic solutions of Lienard differential equations via averaging theory of order two
Provedor de dados: 42
Autores: LLIBRE,JAUME; NOVAES,DOUGLAS D.; TEIXEIRA,MARCO A.
Abstract For    ε ≠ 0sufficiently small we provide sufficient conditions for the existence of periodic solutions for the Lienard differential equations of the form        x ′′ +  f ⁢  ( x ) ⁢  x ′ +   n 2 ⁢ x +  g ⁢  ( x ) =    ε 2 ⁢  p 1 ⁢  ( t ) +   ε 3 ⁢  p 2 ⁢  ( t ) , where   n is a positive integer,   f :  ℝ → ℝis a    C 3function,   g :  ℝ → ℝis a    C 4function, and    p i :  ℝ → ℝfor    i =  1 , 2are continuous    2 ⁢ π–periodic function. The main tool used in this paper is the averaging theory of second order. We also provide one application of the main result obtained.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Periodic solution; Lienard differential equation; Averaging theory; Bifurcation theory.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501905

TL, OSL and C-14 dating results of the sediments and bricks from mummified nuns' grave
Provedor de dados: 42
Autores: Tudela,Diego R.G.; Tatumi,Sonia H.; Yee,Márcio; Brito,Silvio L.M.; Morais,José L.; Morais,Daisy de; Piedade,Silvia C.; Munita,Casimiro S.P.; Hazenfratz,Roberto.
This paper presents the results of TL and OSL dating of soil and fragments of bricks from a grave, which was occupied by two mummified nuns, found at "Luz" Monastery, located in the state of São Paulo, Brazil. The TL and OSL ages were compared to C-14 dating ones obtained from bone collagens of the mummies. The majority of the ages is related to the eighteenth century. The gamma-ray spectroscopy was used to evaluate natural radioisotope concentrations in the samples, and by using these concentrations the annual dose rates, from 3.0 to 5.3 Gy/kyr, were obtained. Neutron activation analysis was performed and the radioisotope contents results are in agreement with those obtained by gamma-ray spectroscopy. The contents of U, Th and Ce elements were higher than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dating; Thermoluminescence (TL); Optical stimulated Luminescence (OSL); Mummified Nuns; Mosteiro da "Luz".
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200002

Evidences of self planting propagules of Rhizophora mangle L.
Provedor de dados: 42
Autores: MENEZES,NANUZA L. DE.
Abstract: The authors of the 19th century had demonstrated the viviparity of the species Rhizophora mangle L. with the formation of propagules in the form of spears devoid a radicle, adapted self-planting in the soil of the mangrove or to leave floating in vertical during the high tide. With low tide the propagules self-planting or remain prostrate on the soil but later become upright later. When the seedlings are unearthed, those who are self-planting are straight from end to end; those that stood erect later show a curvature at the base in the form of J (J-shaped). Authors of the last 30 years have questioned the self-planting and accurately demonstrate how the prostrate propagules rise from the ground. It has been verified that the propagule is stem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propagule; Rhizophore; Mangrove; Plant viviparity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500617

Physicochemical, Antioxidant and Sensory Quality of Brazilian Blueberry Wine
Provedor de dados: 42
Autores: SANTOS,ROBERTA O.; TRINDADE,SIMONE C.; MAURER,LUANA H.; BERSCH,ANDRIELY M.; SAUTTER,CLAUDIA K.; PENNA,NEIDI G.
ABSTRACT Currently, Rio Grande do Sul state is the main producer of blueberry in Brazil. Practically all production is commercialized in fresh state and only a small portion is subject to processing. The blueberry wine making process is an alternative to expand the beverage industry and offers to the consumer a value-added product as well as a new market for Brazilian blueberry producers. The objectives of this study were to produce wines from blueberries and to evaluate the effect of deacidification (with calcium carbonate) and chaptalization (with glucose syrup or sucrose) on physicochemical characteristics, antioxidant content, and sensory parameters. Samples were analyzed for total soluble solids, pH, total titratable acidity, total sugar content,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vaccinium ashei Reade; Anthocyanin; Phenolic compounds; Alcoholic beverage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401557

Brazilian science communication research: national and international contributions
Provedor de dados: 42
Autores: BARATA,GERMANA; CALDAS,GRAÇA; GASCOIGNE,TOSS.
ABSTRACT Science communication has emerged as a new field over the last 50 years, and its progress has been marked by a rise in jobs, training courses, research, associations, conferences and publications. This paper describes science communication internationally and the trends and challenges it faces, before looking at the national level. We have documented science communication activities in Brazil, the training courses, research, financial support and associations/societies. By analyzing the publication of papers, dissertations and theses we have tracked the growth of this field, and compared the level of activity in Brazil with other countries. Brazil has boosted its national research publications since 2002, with a bigger contribution from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Academic training; Brazilian science research; Science communication; Scientific culture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502523

UV induced surface modification on improving the cytocompatibility of metallocene polyethylene
Provedor de dados: 42
Autores: JAGANATHAN,SARAVANA K.; PRASATH,MANI M.
ABSTRACT Demand for medical implants is rising day by day as the world becomes the place for more diseased and older people. Accordingly, in this research, metallocene polyethylene (mPE), a commonly used polymer was treated with UV rays for improving its biocompatibility. Scanning electron microscopy (SEM) images confirmed the formation of crests and troughs, which depicts the improvement of surface roughness of mPE substrates caused by UV etching. Accordingly, the contact angle measurements revealed that the wettability of mPE-2.5 J/cm2 (68.09º) and mPE-5 J/cm2 (57.93º) samples were found to be increased compared to untreated mPE (86.84º) indicating better hydrophilicity. Further, the UV treated surface exhibited enhanced blood compatibility as determined...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metallocene polyethylene; UV treatment; Surface properties; Blood compatibility; Cytotoxicity properties; Biocompatible polymers.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100195

Can nearby eutrophic reservoirs sustain a differentiated biodiversity of planktonic microcrustaceans in a tropical semiarid basin?
Provedor de dados: 42
Autores: DINIZ,LEIDIANE P.; MELO-JÚNIOR,MAURO DE.
ABSTRACT This paper aims to compare alpha and beta diversities of planktonic microcrustaceans from three reservoirs located nearby in a tropical semiarid basin. Our hypothesis was that alpha and beta diversities of the community are different, although the ecosystems are located close to each other. We carried out two sampling campaigns: dry and rainy seasons. The sampling of microcrustaceans and environmental variables (dissolved oxygen, chlorophyll a and nutrient) was performed at twelve stations and were distributed throughout the three zones (river, transition, and lacustrine), using a plankton net (45 µm). The reservoirs showed different uses and types of nitrogen predominance: Cachoeira (supply/nitrate), Borborema (sewage/ammonia) and Saco...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha and beta diversities; Artificial lakes; Cladocera; Copepoda; Brazil; Zooplankton.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602771

Modulators of axonal growth and guidance at the brain midline with special reference to glial heparan sulfate proteoglycans
Provedor de dados: 42
Autores: CAVALCANTE,LENY A.; GARCIA-ABREU,JOSÉ; MOURA NETO,VIVALDO; SILVA,LUIZ CLAUDIO; WEISSMÜLLER,GILBERTO.
Bilaterally symmetric organisms need to exchange information between the left and right sides of their bodies to integrate sensory input and to coordinate motor control. Thus, an important choice point for developing axons is the Central Nervous System (CNS) midline. Crossing of this choice point is influenced by highly conserved, soluble or membrane-bound molecules such as the L1 subfamily, laminin, netrins, slits, semaphorins, Eph-receptors and ephrins, etc. Furthermore, there is much circumstantial evidence for a role of proteoglycans (PGs) or their glycosaminoglycan (GAG) moieties on axonal growth and guidance, most of which was derived from simplified models. A model of intermediate complexity is that of cocultures of young neurons and astroglial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astrocytes; Axon growth; Extracellular matrix; Heparan sulfate; Midline; Midbrain.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400010

Useful plants and their relation to archaeological sites in the Serra de Carajás, Brazil
Provedor de dados: 42
Autores: SANTOS,RONIZE S.; COELHO-FERREIRA,MÁRLIA; LIMA,PEDRO G.C.; MAGALHÃES,MARCOS P.
Abstract: Multidisciplinary studies including archeology and ethnobotany that seek to understand human interventions on the landscape have obtained important results concerning Amazon biodiversity. This study aims to identify the useful plants in different phytophysiognomies related to archeological sites in the Serra de Carajás, in the state of Pará, as well as expand knowledge of the local flora. Information was collected in 76 parcels located in the influence areas of 15 archaeological sites: 45 in forest vegetation, 30 in canga vegetation and 1 in palm swamps. The species were categorized as either medicinal, food, game attractants, firewood, toxic, ritualistic and material. An assessment of the plants use potential by family was done using regression...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archeology; Use category; Ethnobotany; Phytophysiognomy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100619

A new species of Elasmopus (Amphipoda: Hadzioidea: Maeridae) from Suape Harbor, Northeastern Brazilian coast
Provedor de dados: 42
Autores: Senna,André R.
A new amphipod species of the genus Elasmopus Costa, 1853 is described based on material collected from intertidal rocky shore, near the Suape Harbor, coast of the Brazilian state of Pernambuco. The new species may be recognized by the propodus of gnathopod 2 suboval, slightly tapering distally, palmar margin not defined by a stout seta, spine, or palmar corner, with a subdistal blunt tubercle, posterior margin covered by a dense fringe of plumose setae, and posterior margin of basis of pereopod 7 castelloserrate. This is the ninety-fifth species of the genus Elasmopus described worldwide, the most diverse genus in the family Maeridae Krapp-Schickel, 2008, and the eighth species recorded from Brazilian waters. An identification key to Brazilian species of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Elasmopus souzafilhoi sp. nov; Gammaridea; Intertidal; Pernambuco; Taxonomy.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300021

Food consumption as an indicator of the conservation of natural resources in riverine communities of the Brazilian Amazon
Provedor de dados: 42
Autores: ISAAC,VICTORIA J.; ALMEIDA,MORGANA C.; GIARRIZZO,TOMMASO; DEUS,CLAUDIA P.; VALE,ROZEILZA; KLEIN,GILMAR; BEGOSSI,ALPINA.
ABSTRACT The present study analyzed and compared the daily consumption of foods of animal origin in eleven communities of the Lower Amazon, Trombetas and Purus Rivers, representing three different management systems and levels of conservation in the Brazilian Amazon. All food items of animal origin were weighed by at least 10% of the families in the study communities during a week in each period of the flood cycle between 2006 and 2008. Fish was the most important food, and was consumed during six days of the week, with an average rate of 169 kg.person-1.year-1. Game was second in importance, with 37 kg.person-1.year-1. This yearly rate of fish consumption is one of the highest in the world and is almost double the minimum recommended by the World Health...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Game meat; Management; Deforestation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502229

DNA damage and cytotoxicity in pathology laboratory technicians exposed to organic solvents
Provedor de dados: 42
Autores: AQUINO,TATIANE DE; ZENKNER,FERNANDA F.; ELLWANGER,JOEL H.; PRÁ,DANIEL; RIEGER,ALEXANDRE.
The aim of this study was to evaluate potential DNA damage and cytotoxicity in pathology laboratory technicians exposed to organic solvents, mainly xylene. Peripheral blood and buccal cells samples were collected from 18 technicians occupationally exposed to organic solvents and 11 non-exposed individuals. The technicians were sampled at two moments: Monday and Friday. DNA damage and cytotoxicity were evaluated using the Comet Assay and the Buccal Micronucleus Cytome assay. Fifteen subjects (83.5%) of the exposed group to solvents complained about some symptom probably related to contact with vapours of organic solvents. DNA damage in the exposed group to solvents was nearly 2-fold higher on Friday than on Monday, and in both moments the individuals of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA damage; Micronucleus; Toxicology; Occupational health; Organic solvents; Xylene.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100227

Barium and its Importance as an Indicator of (Paleo)Productivity
Provedor de dados: 42
Autores: LIGUORI,BIANCA T.P.; ALMEIDA,MARCELO G. DE; REZENDE,CARLOS E. DE.
ABSTRACT Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO4) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column suggesting a direct or indirect involvement in the marine biological cycling. In addition, barite has a high preservation rate (~30%) in sediments and it is less affected by early diagenesis than other proxies for productivity such as carbonates (~10%) and organic carbon (~1%), for example. Therefore, Ba is considered an excellent proxy for ocean (paleo)productivity. However, correlating barite to productivity involves some caveats. Specifically, the post-depositional formation of barite in oxic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barite; Biogenic barium; (paleo)productivity proxy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602093

The transition from memory retrieval to extinction
Provedor de dados: 42
Autores: Cammarota,Martín; Barros,Daniela M.; Vianna,Mónica R.M.; Bevilaqua,Lia R.M.; Coitinho,Adriana; Szapiro,Germán; Izquierdo,Luciana A.; Medina,Jorge H.; Izquierdo,Iván.
Memory is measured by measuring retrieval. Retrieval is often triggered by the conditioned stimulus (CS); however, as known since Pavlov, presentation of the CS alone generates extinction. One-trial avoidance (IA) is a much used conditioned fear paradigm in which the CS is the safe part of a training apparatus, the unconditioned stimulus (US) is a footshock and the conditioned response is to stay in the safe area. In IA, retrieval is measured without the US, as latency to step-down from the safe area (i.e., a platform). Extinction is installed at the moment of the first unreinforced test session, as clearly shown by the fact that many drugs, including PKA, ERK and protein synthesis inhibitors as well as NMDA receptor antagonists, hinder extinction when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Memory; Retrieval; Extinction; Reconsolidation; Inhibitory avoidance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300011

Species richness and composition of epiphytic bryophytes in flooded forests of Caxiuanã National Forest, Eastern Amazon, Brazil
Provedor de dados: 42
Autores: CERQUEIRA,GABRIELA R.; ILKIU-BORGES,ANNA LUIZA; FERREIRA,LEANDRO V.
ABSTRACT This study aimed to compare the richness and composition of the epiphytic bryoflora between várzea and igapó forests in Caxiuanã National Forest, Brazilian Amazon. Bryophytes were collected on 502 phorophytes of Virola surinamensis. Average richness per phorophyte and composition between forests and between dry and rainy periods was tested by two-way analysis and by cluster analysis, respectively. In total, 54 species of 13 families were identified. Richness was greater in igapó forest (44 species) compared to várzea forest (38 species). There was no significant difference in the number of species between the studied periods. Cluster analysis showed the bryoflora composition was different between várzea and igapó, but not between dry and rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floristics; Liverworts; Mosses; Seasonality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502371

Immature stages of Spodoptera albula (Walker) (Lepidoptera: Noctuidae): Developmental parameters and host plants
Provedor de dados: 42
Autores: MONTEZANO,DÉBORA G.; SPECHT,ALEXANDRE; BORTOLIN,TARCISO M.; FRONZA,EDEGAR; SOSA-GÓMEZ,DANIEL R.; ROQUE-SPECHT,VÂNIA F.; PEZZI,PATRÍCIA; LUZ,PRISCILA C.; BARROS,NEIVA M.
This study aimed to detail the temporal and morphological parameters of the immature stages of Spodoptera albula (Walker 1857) under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photophase) and to gather information about their larval host plants. For this purpose, a new rearing method and artificial diet was employed and validated. The viability of the egg, larval, pupal and pre-pupal stages was 94.54, 97.33, 93.84 and 92.34%, respectively. The average duration of the egg, larval, pupal and pre-pupal stages was 4.14, 16.37, 1.69, and 9.34 days, respectively. During the larval stage, 80.85% of females and 93.99% of males passed through six and remaining through seven instars, with significant larval protandry. The larvae that developed through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual crop pest; Armyworm; Artificial diet; Development; Life cycle.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100271

Potential Therapeutical Compounds and Scientific Performance of Brazilian Researchers
Provedor de dados: 42
Autores: SCHUCK,PATRÍCIA F.
Tipo: Info:eu-repo/semantics/other
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501601

Flowering phenology and pollination of ornithophilous species in two habitats of Serra da Bodoquena, Mato Grosso do Sul, Brazil
Provedor de dados: 42
Autores: Faria,Rogério R.; Araújo,Andréa C.
The aim of this study is to describe interactions between hummingbirds and ornithophilous species at Serra da Bodoquena in midwest Brazil, with focus on flowering phenology and pollination of these plant species. In two habitats, gallery forest and semi-deciduous forest, data on flowering phenology of ornithophilous species were collected monthly over 14 months. In addition, data on morphology and floral biology, as well as visitor frequency and hummingbird behavior, were recorded. The studied community contained eight ornithophilous plant species and six hummingbird species. The ornithophilous species flowered throughout the year, and the greatest abundance of flowers was at the end of the rainy season and the beginning of the dry one. The herit huingbird...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flowering; Floral resources; Hummingbirds; Ornithophily; Acanthaceae; Circular statistics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400006

Spatial Distribution of Eggs of Alabama argillacea Hübner and Heliothis virescens Fabricius (Lepidoptera: Noctuidae) on Bt and non-BtCotton
Provedor de dados: 42
Autores: RODRIGUES,TATIANA R.; FERNANDES,MARCOS G.; DEGRANDE,PAULO E.; MOTA,THIAGO A.
ABSTRACT Among the options to control Alabama argillacea (Hübner, 1818) and Heliothis virescens (Fabricius, 1781) on cotton, insecticide spraying and biological control have been extensively used. The GM'Bt' cotton has been introduced as an extremely viable alternative, but it is yet not known how transgenic plants affect populations of organisms that are interrelated in an agroecosystem. For this reason, it is important to know how the spatial arrangement of pests and beneficial insect are affected, which may call for changes in the methods used for sampling these species. This study was conducted with the goal to investigate the pattern of spatial distribution of eggs of A. argillacea and H. virescens in DeltaOpalTM (non-Bt) and DP90BTMBt cotton...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cotton leafworm; Gossypium hirsutum; Tobacco Budworm; GMO.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502243

Counting rational plane curves
Provedor de dados: 42
Autores: Vainsencher,Israel.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400035

Avian Communities in the Amazonian Cangas Vegetation: Biogeographic Affinities, Components of Beta-Diversity and Conservation
Provedor de dados: 42
Autores: BORGES,SÉRGIO H.; SANTOS,MARCOS P.D.; SOARES,LEONARDO M.S.; SILVA,ANTONITA S. DA.
ABSTRACT The Amazonian cangas is a vegetation type distributed as patches of open vegetation embedded in a matrix of tropical forest and that grows over iron-rich soils in the Serra dos Carajás region. To characterize cangas avifauna, we surveyed birds in eight patches varying from 43 to 1,366 hectares. Cangas avifauna has compositional affinities with savannas widespread throughout the Amazon and other biomes, and we estimate that more than 200 bird species occurs in this habitat. Species composition was relatively homogeneous, and the similarity among cangas patches was the dominant component of the beta-diversity. Bird communities in cangas patches exhibited statistically significant nested structure in respect to species richness and patch size. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian habitats; Insular habitats; Iron mines; Neotropical birds; Rock outcrops.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502167

Notes on the axial skeleton of the titanosaur Bonitasaura salgadoi (Dinosauria-Sauropoda)
Provedor de dados: 42
Autores: Gallina,Pablo A.
Sauropod axial anatomy is particularly important in understanding morphological features and phylogenetic analyses. Spatial arrangement of zygapophyses and rib articulations, as well as their complex laminar development, help to recognize the relative position of isolated vertebral elements. The presence of anterior, mid and posterior elements along the cervical, dorsal and caudal series in Bonitasaura salgadoi allows the analysis of several anatomical characteristics. These include the pattern of neurocentral closure with unfused, partially fused and completely fused elements in a peculiar temporal sequence, as well as several neural spine modifications and the laminar arrangement. The variations in neural spine morphology include a lateral expansion of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinosauria; Neural spine; Neurocentral closure; Sauropoda; Titanosauria; Vertebral laminae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100013

Processing of nanomaterials in Layer-by-Layer films: Potential applications in (bio)sensing and energy storage
Provedor de dados: 42
Autores: OLIVEIRA,DANILO A.; GASPAROTTO,LUIZ H.S.; SIQUEIRA JR,JOSÉ R.
Abstract﻿: The study and preparation of new nanostructures involving the integration of distinct nanomaterials have been important for the development of new electrochemical devices for (bio)sensing and energy storage. Such devices envisage miniaturized or flexible electronic equipment for emerging technologies, including adaptive displays, artificial skin and wearable devices. In this way, the processing of specific nanomaterials may lead to nanostructures with properties that permit the fabrication of multifunctional devices for different applications, including sensors and supercapacitors. Therefore, the use of a suitable method to manipulate nanomaterials in a same nanostru﻿cture is important for this purpose. Thus, we expect that this review provides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nanomaterials; Layer-by-Layer technique; Nanostructures; Electrochemical devices; Sensors; Supercapacitors.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300301

A new species of Tereancistrum (Monogenea, Dactylogyridae) from the gills of three Leporinus species (Characiformes, Anostomidae) and a revised description of Tereancistrum parvus
Provedor de dados: 42
Autores: ZAGO,ALINE C.; YAMADA,FÁBIO H.; FRANCESCHINI,LIDIANE; BONGIOVANI,MARCELA F.; YAMADA,PRISCILLA O.F.; SILVA,REINALDO J. DA.
ABSTRACT The present study describes Tereancistrum flabellum n. sp. (Dactylogyridae, Ancyrocephalinae) from the gills of the anostomid fishes Leporinus friderici, Leporinus amblyrhynchus and Leporinus elongatus from two freshwater ecosystems in the south east of Brazil. This new species is mainly characterized by the morphology of the copulatory complex (such as the MCO base formed by two fan-shaped structures, and accessory piece flattened, curved, rigid and channeled), a dorsal anchor with a well-developed superficial and inconspicuous deep root, and the shape of the accessory anchor sclerite with small spathulate termination. Tereancistrum flabellum n. sp. is the first record of a dactylogyrid from L. amblyrhynchus. The description of Tereancistrum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ancyrocephalinae; Anostomid fish; Gill ectoparasites; Monogeneans; Neotropical region.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301121

New spatial central configurations in the 5-body problem
Provedor de dados: 42
Autores: Mello,Luis F.; Fernandes,Antonio C.
In this paper we show the existence of new families of convex and concave spatial central configurations for the 5-body problem. The bodies studied here are arranged as follows: three bodies are at the vertices of an equilateral triangle T, and the other two bodies are on the line passing through the barycenter of T that is perpendicular to the plane that contains T.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Central configurations; Spatial configurations; 5-body problem; Convex configuration; Concave configuration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300002

Spectral characterization of mangrove leaves in the Brazilian Amazonian Coast: Turiaçu Bay, Maranhão State
Provedor de dados: 42
Autores: Rebelo-Mochel,Flávia; Ponzoni,Flávio J.
Mangrove communities are tropical systems which have fewer species than tropical forests, especially in Latin America and display a single architecture, usually lacking the various strata commonly found in other forest ecosystems. The identification of mangrove communities by orbital data is not a difficult task but the most interesting challenge is to identify themselves by the dominant species. The first step toward that floristic identification is the spectral characterization of detached leaves. Leaves from four species of mangrove trees were spectrally characterized considering the Directional Hemispherical Reflectance Factor (DHRF) determined through radiometric measurements using an integrating sphere LICOR 1800 attached to a spectroradiometer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf reflectance; Mangroves; Spectral characterization of leaves.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400009

Origin of thickening in monocotyledon stems, slope variation and population structure in a riparian forest, and the influence of seagrass beds in fish community structure
Provedor de dados: 42
Autores: Kellner,Alexander W. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300001

First Occurrence and Paleo-Ecological Implications of Insects (Orthoptera: Ensifera Gryllidae) in the Romualdo Member of the Santana Formation, Eo-Cretaceous of the Araripe Basin
Provedor de dados: 42
Autores: FREITAS,LUÍS C.B.; MOURA,GERALDO J.B. DE; SARAIVA,ANTÔNIO A.F.
ABSTRACT The Romualdo Member of the Santana Formation, a lithostatigraphic unit attributed to a marine intrusion, is famous for its preserved fossils in calcareous concretions, which stand out for their diversity and excellent preservation levels. This paper aims to record the first occurrence of the Class Insecta in the Romualdo Member of the Santana Formation of the Araripe Basin, as well as to describe and discuss the paleo-ecological implications of such finding. The first occurrence of the order Orthoptera (family Gryllidae) is presented for this unit. This new species is attributed to the genus Araripegryllus, that lasted throughout the deposition of the Crato Member, which is under the Romualdo Member. In reference to its statigraphic origin, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araripegryllus; Grylloidea; Calcareous concretions; Araripegryllus romualdoi.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602113

Simulation of a surface spill of different diesel/biodiesel mixtures in an ultisol, using natural attenuation and bioaugmentation/biostimulation
Provedor de dados: 42
Autores: MEYER,DANIEL D.; BEKER,SABRINA A.; HECK,KARINA; PERALBA,MARIA DO CARMO R.; BENTO,FÁTIMA M.
Abstract Accidents caused by leaks and/or spills on soils need to be addressed. Natural attenuation, biostimulation and bioaugmentation can be useful bioremediation strategies for decontamination processes in soils of diesel/biodiesel mixtures. The purpose of this study was to evaluate the degradation rate of the different fuels (B0, B20 and B100) in an ultisol under natural attenuation and biostimulation/bioaugmentation during 60 days of incubation in a controlled microcosm simulating a surface spill over soil. The degradation of different diesel/biodiesel mixtures was monitored for up to 60 days by dehydrogenase activity, respirometry by CO2 release, the most probable number of heterotrophic and degrading microorganism and gas chromatography. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial consortium; Bioremediation strategies; Dehydrogenase; Respirometry; Soil spill.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602741

Consortium of five fungal isolates conditioning root growth and arbuscular mycorrhiza in soybean, corn, and sugarcane
Provedor de dados: 42
Autores: FARIAS,CHRISTYAN P.; CARVALHO,RAFAEL C. DE; RESENDE,FELIPE M.L.; AZEVEDO,LUCAS C.B.
Abstract Plant growth and arbuscular mycorrhizal colonization were studied in sugarcane, corn and soybean by applying five plant growth promoting fungi: Beauveria bassiana, Metarhizium anisopliae, Pochonia chlamydosporia, Purpureocillium lilacinum, and Trichoderma asperella. Sugarcane, corn and soybean were grown in pots under two treatments: (1) inoculation with the fungal consortium and (2) control without inoculation. In the inoculated treatment, fungal spore suspension were applied to the seeds and shoots were sprayed every 28 days. Means were analyzed by analysis of variance and Tukey’s test at 5% probability level. The experiment was arranged in a completely randomized design, with six replications. Fungi consortium mediate root growth in soybean and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth promoting fungi; Entomopathogenic fungi; Arbuscular mycorrhizal; Phytohormones.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703649

The 1590-1520 Ma Cachoeirinha magmatic arc and its tectonic implications for the Mesoproterozoic SW Amazonian craton crustal evolution
Provedor de dados: 42
Autores: Ruiz,Amarildo S.; Geraldes,Mauro C.; Matos,João B.; Teixeira,Wilson; Van Schumus,William R.; Schmitt,Renata S.
Isotopic and chemical data of rocks from the Cachoeirinha suite provide new insights on the Proterozoic evolution of the Rio Negro/Juruena Province in SW Amazonian craton. Six U-Pb and Sm-Nd analyses in granitoid rocks of the Cachoeirinha suite yielded ages of 1587-1522 Ma and T DM model ages of 1.88-1.75 Ga (EpsilonNd values of -0.8 to +1.0). In addition, three post-tectonic plutonic rocks yielded U-Pb ages from 1485-1389 Ma (T DM of 1.77-1.74 Ga and EpsilonNd values from -1.3 to +1.7). Variations in major and trace elements of the Cachoeirinha suite rocks indicate fractional crystallization process and magmatic arc geologic setting. These results suggest the following interpretations: (1) The interval of 1590-1520 Ma represents an important magmatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian craton; U-Pb and Sm-Nd geochronology; Mesoproterozoic; Juvenile magmatism.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400013

High and low frequency erosive and constructive cycles in estuarine beaches: an example from Garcez Point, Bahia/Brazil
Provedor de dados: 42
Autores: BITTENCOURT,ABÍLIO C.S.P.; LESSA,GUILHERME C.; DOMINGUEZ,JOSÉ M.L.; MARTIN,LOUIS; VILAS BÔAS,GERALDO S.; FARIAS,FÉLIX F.
Monitoring of the morphodynamic variations of the beaches associated with an estuary contiguous with Garcez Point, Bahia, Brazil, and the superposition of aerial photographs from the region, show the presence of distinctive erosive and constructive cycles of low and high frequencies. Between 1959 and 1989, one event of shoreline erosion and progradation was recognized on the oceanic beaches just outside the estuary. Inside the estuary, an erosion phase at the southern margin coincides with a constructive phase at the other side, and vice-versa. On the southern estuarine beach, low-frequency cycles of erosion and progradation are also perceived, but with the inverse trend when compared to the contiguous oceanic beach. During the beach monitoring period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosive and constructive cycles; Longshore sand transport; Wave refraction; Canyon; Ebb-tidal delta; Bahia/Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400013

Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
Provedor de dados: 42
Autores: VARAJÃO,CÉSAR A.C.; BRUAND,ARY; RAMANAIDOU,ERICK R.; GILKES,ROBERT J.
Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drill core and open pit samples. Hematite is the main component of the samples and occurs as granular crystals (10 mum), microplates (1 mum) and euhedral martite (10 to 30 mum). Quartz, maghemite, kenomagnetite and goethite are minor components. Primary micropores (Å to 1 mum) are associated with microplaty crystals that fill cavities between granular hematite. Secondary micropores (Å to 5 mum) related to euhedral martite crystals, are the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BIF; Porosity; Massive hematite ore; Direct reduction iron; Reducibility.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008

Wood anatomy of Mollinedia glabra (Spreng.) Perkins (Monimiaceae) in two Restinga Vegetation Formations at Rio das Ostras, RJ, Brazil
Provedor de dados: 42
Autores: Novaes,Fernanda da S.; Callado,Cátia H.; Pereira-Moura,Maria Verônica L.; Lima,Helena R.P.
This paper aimed to characterize the anatomical structure of the wood of specimens of Mollinedia glabra (Spreng.) Perkins growing in two contiguous formations of restinga vegetation at Praia Virgem, in the municipality of Rio das Ostras, RJ. Both the Open Palmae (OPS) and the Sandy Strip Closed Shrub (SSCS) formations are found in coastal regions that receive between 1,100 and 1,300 mm of rainfall per year. Sapwood samples were collected in both formations. Typical anatomical features for this species include: solitary vessels, radial multiples or clusters elements, that are circular to angular in outline, 5-15 barred scalarifor perforation plates, ood parenchya scanty, septate fiber-tracheids, and wide multiseriate rays with prismatic crystals....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollinedia glabra; Monimiaceae; Restinga; Wood anatomy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400014

Ethnic ancestry and smoking, farming of wine grapes in semiarid regions, and the potentials of Manihot multifida in medicine use
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100001

6-Gingerol inhibits hair cycle via induction of MMP2 and MMP9 expression
Provedor de dados: 42
Autores: HOU,CHUN; MIAO,YONG; JI,HANG; WANG,SUSHENG; LIANG,GANG; ZHANG,ZHIHUA; HONG,WEIJIN.
ABSTRACT 6-Gingerol is the major active constituent of ginger. In the current study, we aimed to investigate the mechanisms underlying the effects of 6-Gingerol on hair growth. Mice were randomly divided into five groups; after hair depilation (day 0), mice were treated with saline, or different concentrations of 6-Gingerol for 11 days. The histomorphological characteristics of the growing hair follicles were examined after hematoxylin and eosin staining. The results indicated that 6-Gingerol significantly suppressed hair growth compared with that in the control group. And choose the concentration of 6-Gingerol at 1 mg/mL to treated with mice. Moreover, 6-Gingerol (1 mg/mL) significantly reduced hair re-growth ratio, hair follicle number, and hair follicle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MMP2; MMP9; 6-Gingerol; Hair growth.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602707

Differences between NMRI and DBA/2J mice in the development of somites and susceptibility to methylnitrosourea-induced skeleton anomalies
Provedor de dados: 42
Autores: CHAHOUD,IBRAHIM; PAUMGARTTEM,FRANCISCO J.R.
ABSTRACT The development of DBA/2J mouse strain embryos is nearly 12 h - or 6 somite pairs - delayed as compared to the outbred NMRI mouse embryos of the same age on gestation days (GD) 8-12. To evaluate inter-strain differences in susceptibility to teratogens, dams were treated with methylnitrosourea (MNU, 5 mg/kg body weight i.p.) on defined gestation days (NMRI: GD 9, 91/2 or 10; DBA/2J: GD 10 or 101/2). Skeletal anomalies produced by MNU on both mouse strains varied with the GD of treatment. The pattern of anomalies produced by MNU on a given GD markedly differed between the two mouse strains, yet they were similar -with a few exceptions- when exposures at equivalent embryonic stages are compared. Findings from this study indicated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkylating agents; Embryo development; Phase specificity; Mouse strains; Skeleton anomalies; Teratogenicity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200635

Environmental factors related to the production of a complex set of spicules in a tropical freshwater sponge
Provedor de dados: 42
Autores: MATTEUZZO,MARCELA C.; VOLKMER-RIBEIRO,CECÍLIA; VARAJÃO,ANGÉLICA F.D.C.; VARAJÃO,CÉSAR A.C.; ALEXANDRE,ANNE; GUADAGNIN,DEMETRIO L.; ALMEIDA,ARIANA C.S.
ABSTRACT Adverse natural conditions will, generally, induce gemmulation in freshwater sponges. Because of this environmental dependence, gemmoscleres are given exceptional value in taxonomic, ecological and paleoenvironmental studies. Other spicules categories such as microscleres and beta megascleres have received little attention with regard to their occurrence and function during the sponge biological cycle. Metania spinata, a South American species common to bog waters in the Cerrado biome, produces alpha and beta megascleres, microscleres and gemmoscleres. To detect the environmental factors triggering the production of all these kinds of spicules, the species annual seasonal cycle was studied. Artificial substrates were devised, supplied with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Field monitoring; Metania spinata; Paleointerpretations; Spicules.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502013

Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen
Provedor de dados: 42
Autores: ARENA,KARINE DA ROSA; HARTMANN,LÉO AFRANEO; LANA,CRISTIANO DE CARVALHO; QUEIROGA,GLÁUCIA NASCIMENTO; CASTRO,MARCO PAULO DE.
Abstract  The isotopic and geochemical evolution of tourmaline constrain the processes of paleo-oceanic lithosphere in ophiolites. The Brasiliano Orogen is a major structure of South America and requires characterization for the understanding of Gondwana supercontinent evolution. We made a pioneering investigation of tourmaline from a tourmalinite in the Ibaré ophiolite by integrating field work with chemical analyses of tourmaline by electron microprobe (EPMA) and δ11B determinations via laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS). Remarkably massive tourmalinite (&gt;90 vol.% tourmaline, some chlorite) enclosed in serpentinite has homogeneous dravite in chemical and isotopic composition (δ11B = +3.5 to +5.2‰). These results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boron isotopes; Geochemistry; Ibaré ophiolite; Tourmalinite; Southern Brasiliano Orogen.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100603

Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review.
Provedor de dados: 42
Autores: VARANDA,LAUDEMIR C.; SOUZA,CAIO G.S.; MORAES,DANIEL A.; NEVES,HERBERT R.; SOUZA JUNIOR,JOÃO B.; SILVA,MONICA F.; BINI,RAFAEL A.; ALBERS,REBECCA F.; SILVA,TIAGO L.; BECK JUNIOR,WATSON.
Abstract: Since its inception in 2007, the Colloidal Materials Group, one of the research groups in nanotechnology of the Institute of Chemistry of São Carlos (IQSC) at University of São Paulo (USP) carries out studies related to the development of syntheses methods of nanoparticles and multifunctional nanostructured systems. Our works search new synthesis methodologies that allow high size and shape control of the individual nanoparticles or that compose the nanostructured systems and has as a principle the synthetic approaches based on the modified polyol and thermal decomposition processes. Systems involving nanoparticles have received extensive attention both in the fundamental research and in several technological applications exploring the unique...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nanoparticles; Nanostructured composites; Modified polyol process; Thermal decomposition method; Size and shape control; Colloidal Materials Group.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700406

An unusual long-tailed pterosaur with elongated neck from western Liaoning of China
Provedor de dados: 42
Autores: Wang,Xiaolin; Kellner,Alexander W.A.; Jiang,Shunxing; Meng,Xi.
A new long-tailed pterosaur, Wukongopterus lii gen. et sp. nov, is described based on an almost complete skeleton (IVPP V15113) representing an individual with an estimated wing span of 730 mm. The specimen was discovered in strata that possibly represent the Daohugou Bed (or Daohugou Formation) at Linglongta, Jianchang, Liaoning Province, China. Wukongopterus lii is a non-pterodactyloid pterosaur diagnosed by the first two pairs of premaxillary teeth protruding beyond the dentary, elongated cervical vertebrae (convergent with Pterodactyloidea), and a strongly curved second pedal phalanx of the fifth toe. The specimen further has a broken tibia that indicates an injury occurred while the individual was still alive. Taphonomic aspects provide indirect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Wukongopterus; ?Late Jurassic-Early Cretaceous; Liaoning; China.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400016

Anti-inflammatory, antinociceptive, and antipyretic effects of methanol extract of Cariniana rubra stem bark in animal models
Provedor de dados: 42
Autores: Santos,Edson N.; Lima,Joaquim C.S.; Noldin,Vânia F.; Cechinel-Filho,Valdir; Rao,Vietla S. N.; Lima,Evangelista F.; Schmeda-Hirschmann,Guillermo; Sousa Jr.,Paulo T.; Martins,Domingos T.O.
Cariniana rubra Miers (Lecythidaceae), popularly known as "jequitibá-vermelho'', is a large Brazilian tree whose bark is used in infusion and decoction for the treatment of inflammatory conditions. This study aims to assess the anti-inflammatory, antinociceptive, and antipyretic effects of Cariniana rubra methanolic stem bark extract (EM Cr) using experimental animals. Anti-inflammatory activity of EM Cr was tested on carrageenan and dextran-induced rat paw edema, carrageenan-induced pleurisy in rats and acetic acid-increase vascular permeability in mice. Antinociceptive and antipyretic activities were evaluated using acetic acid-induced writhing, formalin and hot-plate tests in mice, as well as brewer's yeast-induced pyrexia in rats. The extract...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-inflammatory; Antinociceptive; Antipyretic; Cariniana rubra; Lecythidaceae; Triterpenoidal saponins.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200015

An entomological surveillance system based on open spatial information for participative dengue control
Provedor de dados: 42
Autores: Regis,Leda; Souza,Wayner V.; Furtado,André F.; Fonseca,Cláudio D.; Silveira Jr.,José C.; Ribeiro Jr.,Paulo J.; Melo-Santos,Maria Alice V.; Carvalho,Marilia S.; Monteiro,Antonio M.V.
Aedes aegypti is a very efficient disseminator of human pathogens. This condition is the result of evolutionary adaptations to frequent haematophagy, as well as to the colonization of countless types of habitats associated with environmental and cultural factors that favor the proliferation of this mosquito in urban ecosystems. Studies using sensitive methods of monitoring demonstrate that the methods of surveillance used in the Brazilian program do not show the high degrees of the infestation of cities by this vector. To increase the capacity of the health sector, new tools are needed to the practice of surveillance, which incorporate aspects of the vector, place and human population. We describe here the SMCP-Aedes - Monitoring System and Population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dengue vector; Entomological surveillance; Ovitraps; GIS; Vector control.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400004

Paleoenvironmental evolution of the coastal plain of Southern Brazil: palynological data from a Holocene core in Santa Catarina State
Provedor de dados: 42
Autores: KUHN,LIDIA A.; SOUZA,PAULO A.; CANCELLI,RODRIGO R.; SILVA,WAGNER G.; MACEDO,RENATO B.
ABSTRACT This paper presents a paleoenvironmental reconstruction from palynological analyses of a sedimentary core of Holocene age, drilled at municipality of Garopaba (Santa Catarina), Southern Brazil. A total of 46 samples was collected for palynological analyses in the 450 cm-long core PCSC-3, as also three samples for radiocarbon dating and granulometric analyses. The palynological content includes 84 taxa related to pollen grains of angiosperms (38) and gimnosperm (3), spores of pteridophyta (16) and bryophyta (2), spores of fungi (8), algae (3), acritarchs (3), dinoflagellate cysts (2) and microforaminiferal linings (1). Three specimens of acritarchs are described and illustrated in detail. Three palynological phases were defined based on changes in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal plain; Environmental evolution; Holocene; Palynology; Santa Catarina.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602581

Effect of indigo dye effluent on the growth, biomass production and phenotypic plasticity of Scenedesmus quadricauda(Chlorococcales)
Provedor de dados: 42
Autores: CHIA,MATHIAS A.; MUSA,RILWAN I.
The effect of indigo dye effluent on the freshwater microalgaScenedesmus quadricauda ABU12 was investigated under controlled laboratory conditions. The microalga was exposed to different concentrations of the effluent obtained by diluting the dye effluent from 100 to 175 times in bold basal medium (BBM). The growth rate of the microalga decreased as indigo dye effluent concentration increased (p &lt;0.05). The EC50 was found to be 166 dilution factor of the effluent. Chlorophyll a, cell density and dry weight production as biomarkers were negatively affected by high indigo dye effluent concentration, their levels were higher at low effluent concentrations (p &lt;0.05). Changes in coenobia size significantly correlated with the dye effluent concentration. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Microalgae; Morphological variation; Pollution; Textile waste.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100419

Bird community as an indicator of biodiversity: results from quantitative surveys in Brazil
Provedor de dados: 42
Autores: VIELLIARD,JACQUES M. E.
This short review presents the results obtained in several localities of Brazil on the composition of forest bird communities. Data were collected since the late 80's, after we introduced a new methodology of quantitative survey, based on acoustic identification and unlimited-radius point census. Although these data are still scattered, they show uniquely precise and coherently comparative patterns of composition of forest bird communities. Our methodology has the advantage of being absolutely non-disturbing, highly efficient in the field and immediately processed. Results confirm that the structure of a bird community is a good indicator of biodiversity, particularly useful where biodiversity is high. Many of these data are available only in unpublished...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Community; Census; Brazil; Biodiversity; Conservation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300006

Contulma vascaina sp. n. (Insecta: Trichoptera: Anomalopsychidae), a new species from Rio de Janeiro state, southeastern Brazil
Provedor de dados: 42
Autores: DUMAS,LEANDRO L.
ABSTRACT The caddisfly genus Contulma Flint, 1969, with 30 described species, is endemic to the Neotropics. In addition to the five species currently recorded from Brazil, a new species of Contulma is described and illustrated in this work. Contulma vascaina sp. n. is similar to C. sana Jardim and Nessimian, 2011 in prominent, slender and rod-like posterolateral lobe of segment IX, but the new species has a shorter posterolateral lobe, with long, spine-like seta apically. Contulma vascaina sp. n. can also be characterized by the presence of a large, hood-like sclerotized plate on the endothecal phallic membrane. The female genital structure is also described and illustrated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Caddisfly; Contulma; Female description; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602921

A new small deinonychosaur (Dinosauria: Theropoda) from the Late Cretaceous of Patagônia, Argentina
Provedor de dados: 42
Autores: Porfiri,Juan D.; Calvo,Jorge O.; Santos,Domenica dos.
Here we report on a new small deinonychosaurian theropod, Pamparaptor micros gen. et sp. nov., from the Late Cretaceous of Patagônia, Argentina. Pamparaptor micros exhibits a pedal structure previously unknown among South Américan deinonychosaurians. The new material provides new evidence about the morphology and taxonomic diversity of Patagônian deinonychosaurs. Pamparaptor is the smaller non-avialae Patagônian deinonychosaur, probably with about 0.50-0.70 meters, long. The pedal construction resembles, that of Troodontid or basal Dromaeosaurids. Nevertheless, up to now, we considered Pamparaptor a peculiar Patagônian Dromaeosaurid with troodontid-like pes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Barreales Lake; Dromaeosauridae; Late Cretaceous; Patagônia; Unenlagiinae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100007

Physio-anatomic aspects on the initial growth of Guazuma ulmifolia Lam. seedlings (Sterculiaceae)
Provedor de dados: 42
Autores: Scalon,Silvana P. Q; Pereira,Heloisa H. G; Glaeser,Daniele F; Silva,Jocemar J; Betoni,Roseli; Mussury,Rosilda M.
This paper aimed to evaluate the initial growth of "mutambo" seedlings in different conditions of light intensity and treatments with gibberellic acid (GA). The seedlings were kept under full sun and 50% of shading. Sixty days after the emergence, seedlings were sprayed with: 1) 100 mg L-1 GA3; 2) 200 mg L-1 GA3; 3) control. At the end of the appraisals, seedlings height under 50% of shading was compared to the height that were growing under full sun with 200 mg L-1 GA. Stem diameter was lower under shading. Leaf area did not vary among the treatments, but the root system growth was higher under full sun and did not vary among GA levels. The number of stomata, trichomes and epidermal cells on adaxial and abaxial sides was higher under full sun. Total dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecophysiology; Gibberellin; Mutambo.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200027

The Log-Odd Normal Generalized Family of Distributions with Application
Provedor de dados: 42
Autores: ZUBAIR,MUHAMMAD; POGÁNY,TIBOR K.; CORDEIRO,GAUSS M.; TAHIR,MUHAMMAD H.
Abstract: The normal distribution has a central place in distribution theory and statistics. We propose the log-odd normal generalized (LONG) family of distributions based on log-odds and obtain some of its mathematical properties including a useful linear representation for the new family. We investigate, as a special model, the log-odd normal power-Cauchy (LONPC) distribution. Some structural properties of LONPC distribution are obtained including quantile function, ordinary and incomplete moments, generating function and some asymptotics. We estimate the model parameters using the maximum likelihood method. The usefulness of the proposed family is proved empirically by means of a real air pollution data set.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Generalized class; Maximum likelihood estimation; Normal distribution; Power-Cauchy distribution; Shannon entropy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300203

Inhibitory effects of Zanthoxylum rhoifolium Lam. (Rutaceae) against the infection and infectivity of macrophages by Leishmania amazonensis
Provedor de dados: 42
Autores: MELO NETO,BERNARDO; LEITÃO,JOSEANA M.S.R.; OLIVEIRA,LUCIANO G.C.; SANTOS,SÉRGIO E.M.; CARNEIRO,SABRINA M.P.; RODRIGUES,KLINGER A.F.; CHAVES,MARIANA H.; ARCANJO,DANIEL D.R.; CARVALHO,FERNANDO A.A.
ABSTRACT Zanthoxylum rhoifolium Lam. (Rutaceae) has been traditionally used in the treatment of microbial infections and parasitic diseases. In the present study, the antileishmanial effect induced by the ethanol extract of stem barks from Z. rhoifolium (ZR-EEtOH) and its n-hexane fraction (ZR-FHEX) on infection and infectivity of murine macrophages by promastigote forms of Leishmania amazonensis were investigated. In different set of experiments, macrophages or promastigotes were pretreated with ZR-EEtOH or ZR-FHEX at non-lethal concentrations for 24 hours, and then macrophages were submitted to infection by promastigotes. Moreover, their effects on activation of macrophages, as well as on the DNA content, size and number of promastigotes by flow...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leishmania; Macrophages; Nitric oxide; Promastigote; Phagocytic activity; Zanthoxylum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501851

Chemical zoning of muscovite megacrystal from the Brazilian Pegmatite Province
Provedor de dados: 42
Autores: Viana,Rúbia R.; Evangelista,Hanna J.; Stern,Willem B.
Macroscopically homogenous muscovite plate from the Cruzeiro pegmatite, located in the Eastern Pegmatite Province in Minas Gerais, may show complex distribution patterns of some trace elements. In geochronological and petrological studies, as for example in the distinction of magmatic and post-magmatic mica, the cause of zoning could be taken into consideration. The complex chemical zoning in the studied mica plate can be best explained by growth in an evolving magma followed by alteration due to percolation of hydrothermal fluids. Enrichment of Rb towards the border is interpreted as resulting from the chemical evolution of the residual magma during crystal growth. The depletion in (IV Al+VI Al) as well as the increase in (Fe+Mg) and Si along a fracture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Muscovite; Chemical zoning; Hydrothermal alteration; Cruzeiro pegmatite.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300007

Constant mean curvature one surfaces in hyperbolic 3-space using the Bianchi-Calò method
Provedor de dados: 42
Autores: LIMA,LEVI L. DE; ROITMAN,PEDRO.
In this note we present a method for constructing constant mean curvature on surfaces in hyperbolic 3-space in terms of holomorphic data first introduced in Bianchi's Lezioni di Geometria Differenziale of 1927, therefore predating by many years the modern approaches due to Bryant, Small and others. Besides its obvious historical interest, this note aims to complement Bianchi's analysis by deriving explicit formulae for CMC-1 surfaces and comparing the various approaches encountered in the literature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Constant mean curvature one surfaces; Congruence of spheres; Rolling of surfaces; Weierstrass representation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100002

Responses of the molluscan fauna to environmental variations in a Halodule wrightii Ascherson ecosystem from Northeastern Brazil
Provedor de dados: 42
Autores: BARROS,KCRISHNA V.S.; ROCHA-BARREIRA,CRISTINA A.
ABSTRACTThis study observed the spatial and temporal distributions of molluscs in a Halodule wrightii meadow, verifying if they respond satisfactorily to seasonal changes in this seagrass ecosystem. Twenty-four species were identified. Chitons were rare, bivalves had greater number of species (11), followed by gastropods (9) which were also the most abundant class (73%). All classes were more abundant in the belowground. The most common species was Tricolia affinis, especially in aboveground. The occurrence of some species in both strata or out of the expected stratum may have been influenced by shallow layer of the sediment considered in this study, hydrodynamic, and low biomass of the studied meadow. According to univariate and multivariate analyses,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic communities; Hypnea musciformis; Marine food web; Northeast of Brazil; Seagrasses; Tricolia affinis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401397

Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers
Provedor de dados: 42
Autores: BRAUN,WALTER A.; HORN,BRUNA C.; HOEHNE,LUCÉLIA; STÜLP,SIMONE; ROSA,MARCELO B. DA; HILGEMANN,MAURÍCIO.
ABSTRACT A new modified electrode for indirect sensing of OH· and radical scavengers was described. The electrochemical polymerization of methylene blue in aqueous solutions and the properties of the resulting films on a glassy carbon electrode were carried out using cyclic voltammetry. A surface coverage of 1.11 × 109mol cm2 was obtained, revealing a complete surface coverage of the polymeric film on the electrode surface. OH· was able to destroy the poly(methylene blue) film by exposure to a Fenton solution. The loss of the electrochemical signal of the residual polymeric film attached to the electrode surface was related to the extent of its dissolution. The applicability of the sensor was demonstrated by evaluating the OH radical scavenging effect on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrochemical sensor; Fenton solution; Modified electrode; OH radical; Poly(methylene blue).
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401381

Evaluation of antibiotics as a methodological procedure to inhibit free-living and biofilm bacteria in marine zooplankton culture
Provedor de dados: 42
Autores: Agostini,Vanessa O.; Macedo,Alexandre J.; Muxagata,Erik.
There is a problem with keeping culture medium completely or partially free from bacteria. The use of prokaryotic metabolic inhibitors, such as antibiotics, is suggested as an alternative solution, although such substances should not harm non-target organisms. Thus, the aim of this study was to assess the effectiveness of antibiotic treatments in inhibiting free-living and biofilm bacteria and their half-life in artificial marine environment using the copepod Acartia tonsa as bioindicador of non-harmful antibiotic combinations. Regarding to results, the application of 0.025 g L-1 penicillin G potassium + 0.08 g L-1 streptomycin sulphate + 0.04 g L-1 neomycin sulphate showed great potential for use in marine cultures and scientific experiments without...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acartia tonsa; Antimicrobials; Experiment; Marine culture; Toxicity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200733

Molecular identification of three species of Oncideres (Coleoptera: Cerambycidae) using RAPD markers
Provedor de dados: 42
Autores: CORDEIRO,GLÁUCIA; CUNHA,MARINA S. DA; SILVA,CAROLINA R. DA; JORGE,ISAAC R.; DERGAM,JORGE A.; FERREIRA,PAULO S.F.
Abstract: Twig girdlers have a short adult life and a long larval stage (up to one year in some species). This fact, together with lack of morphological traits to identify the species from the larval stage, poses obstacles for the taxonomic identification and characterization of the many twig girdlers found in the wild. To solve this matter, Random Amplified Polymorphic DNA (RAPD) molecular markers have been applied to identify some insect species and to determine species boundaries. The aim of this study was to identify three species of Oncideres using the RAPD technique. Adults and larvae of O. saga, O. ocularis and O. ulcerosa were collected in Minas Gerais, Brazil. Two RAPD primers were used (OPA-05 and OPB-13), which produced different electrophoretic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Girdled branches; Insect identification; O. ocularis; O. saga; O. ulcerosa; Twig girdler.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500860

Two fast screening methods (GC-MS and TLC-ChEI assay) for rapid evaluation of potential anticholinesterasic indole alkaloids in complex mixtures
Provedor de dados: 42
Autores: Vieira,Ivo J.C.; Medeiros,Walter L.B.; Monnerat,Cecilia S.; Souza,Jucimar J.; Mathias,Leda; Braz-Filho,Raimundo; Pinto,Angelo C.; Sousa,Priscila M.; Rezende,Claudia M.; Epifanio,Rosângela De A.
The pharmacotherapyfor Alzheimer's disease (AD) includes the use of acetylcholinesterase inhibitors (AChEI). Recent investigations for novel AD therapeutic agents from plants suggested that Tabernaemontana genus is a promising source of novel anticholinesterasic indole alkaloids. In this work two fast screening techniques were combined in order to easily identify novel cholinesterase inhibitors (ChEI). Gas chromatography-mass spectrometry (GC-MS) of the less polar alkaloidic fractions obtained from the acid-base extraction of the stalk of T. laeta revealed thirteen monoindole alkaloids, four of them confirmed by co-injection with previously isolated alkaloids. The others were tentatively identified by mass fragmentation analysis. By gas chromatography with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tabernaemontana; Indole alkaloids; Cholinesterase inhibitor; Thin-layer chromatography assay; Ellman´s method; GC-MS.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300003

Quaternary colluvial episodes (Upper Paraná River Hydrographic Basin, Brazil)
Provedor de dados: 42
Autores: Sallun,Alethea E.M.; Suguio,Kenitiro.
Colluvial deposits occur extensively in the Upper Paraná River Hydrographic Basin (UPRHB) in Southeastern,Southern, and Western central Brazil. These deposits were recognized as an allostratigraphic unit and related to creeping during the Quaternary. Every studied colluvial profile is homogeneous, which indicates relatively long periods of landscape stability that is sufficient for the development of a thick soil cover. The deposits were dated by luminescence and indicate periods of more intense colluvial deposition between 6 and 220 ky B.P. These events correspond approximately to the transitions between the oxygen isotope stages 2-3-4 and 5-6, suggesting that this aggradation was influenced by climatic changes. However, the most important alluviation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colluviation; Alluviation; Quaternary; Luminescence dating; Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300018

Fatty acid composition from the marine red algae Pterocladiella capillacea (S. G. Gmelin) Santelices &amp;amp; Hommersand 1997 and Osmundaria obtusiloba (C. Agardh) R. E. Norris 1991 and its antioxidant activity
Provedor de dados: 42
Autores: ALENCAR,DANIEL B. DE; DINIZ,JAÉCIO C.; ROCHA,SIMONE A.S.; PIRES-CAVALCANTE,KELMA M.S.; LIMA,REBECA L. DE; SOUSA,KAROLINA C. DE; FREITAS,JEFFERSON O.; BEZERRA,RAYSSA M.; BARACHO,BÁRBARA M.; SAMPAIO,ALEXANDRE H.; VIANA,FRANCISCO A.; SAKER-SAMPAIO,SILVANA.
ABSTRACT This study evaluated the chemical composition and antioxidant activity of fatty acids from the marine red algae Pterocladiella capillacea (S. G. Gmelin) Santelices &amp; Hommersand 1997 and Osmundaria obtusiloba (C. Agardh) R. E. Norris 1991. The gas chromatography mass spectrometry (GC-MS) identified nine fatty acids in the two species. The major fatty acids of P. capillacea and O. obtusiloba were palmitic acid, oleic acid, arachidonic acid and eicosapentaenoic acid. The DPPH radical scavenging capacity of fatty acids was moderate ranging from 25.90% to 29.97%. Fatty acids from P. capillacea (31.18%) had a moderate ferrous ions chelating activity (FIC), while in O. obtusiloba (17.17%), was weak. The ferric reducing antioxidant power (FRAP) of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acids; Antioxidant activity; Palmitic acid; Rhodophyta.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100449

Diversity and associations between Drosophilidae (Diptera) species and Basidiomycetes in a Neotropical forest
Provedor de dados: 42
Autores: VALER,FELIPE B.; BERNARDI,EDUARDO; MENDES,MAYARA F.; BLAUTH,MONICA L.; GOTTSCHALK,MARCO S.
ABSTRACT Drosophilidae is one of the most representative families of insects that occurs in fungal fruiting bodies of Basidiomycetes; however, the diversity and community structure of mycophagous Drosophilidae in the Neotropical region is poorly known. The aims of the present study were to describe the diversity of mycophagous Drosophilidae and to investigate its colonization of fungal hosts in a forest of southern Brazil. From 120 fungal samples (patches of mushrooms) of 17 Basidiomycetes genera, flies were recorded emerging from 70 samples and collected in adult stages of 25 fungal samples, for a total of 4897 drosophilids belonging to 31 species and 5 genera. Drosophila Fallén was the most species-rich genus, whereas Hirtodrosophila Duda was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Generalist species; Mycophagy; Mushrooms; Pampa biome; Specialist species; Trophic niche.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200705

Study of the Cu, Mn, Pb and Zn dynamics in soil, plants and bee pollen from the region of Teresina (PI), Brazil
Provedor de dados: 42
Autores: Silva,Aline S.; Araújo,Sebastião B.; Souza,Darcet C.; Silva,Fábio A. Santos e.
The purpose of this study is to characterize native bee plants regarding their capacity to extract and accumulate trace elements from the soil and its consequences to the sanity of the produced pollen. The trace elements Cu, Mn, Pb and Zn were analyzed in soil, plants and bee pollen from Teresina region (PI), Brazil, by flame atomic absorption spectrophotometer. Considering the studied plant species, Cu and Pb metals presented in the highest levels in the roots of B. platypetala with 47.35 and 32.71 μg.mL-1 and H. suaveolens with 39.69 and 17.06 μg.mL-1, respectively, while in the aerial parts Mn and Zn metals presented the highest levels in S. verticillata with 199.18 and 85.73 μg.mL-1. In the pollen, the levels of Cu, Mn, Pb and Zn vary from 5.44 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bee pollen; Bee plant; Trace elements; Translocation capacity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400003

Modulation by context of a scene in monkey anterior inferotemporal cortex during a saccadic eye movement task
Provedor de dados: 42
Autores: LIMA,BRUSS; FIORANI,MARIO; GATTASS,RICARDO.
We investigated the effect of a scene on the activity of cells in the anterior inferotemporal (AIT) cortex while the monkey performed a saccadic eye movement (SEM) task with and without the context of a scene (gray frame). Most neurons did not code for the presence of a scene when it appeared alone (monkey free viewing) or when the monkey was fixating. Nevertheless, when a peripheral target was turned on and the monkey had to make a SEM to it, some cells were capable of differentially coding the presence of the scene before and after the saccade.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inferotemporal cortex; Spatial coding; Object coding; Cebus monkey; Perirhinal cortex.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100008

Articles with authors affiliated to Brazilian institutions published from 1994 to 2003 with 100 or more citations: II - identification of thematic nuclei of excellence in Brazilian science
Provedor de dados: 42
Autores: Meneghini,Rogerio; Packer,Abel L.
Articles with 100 citations or more in the scientific literature and with at least one author with Brazilian affiliation, were identified in the Thomson-ISI (Institute for Scientific Information) Web of Science bibliometric database covering a 10-year period, from 1994 to 2003 (see Packer and Meneghini 2006); 248 (0.23%) out of a total of 109,916 articles with Brazilian affiliation were identified. This study was primarily carried out to identify thematic nuclei of excellence in research that had major impact in the international literature. Twelve of these nuclei in the fields of Biomedicine, Medicine, Biology, Physic, Chemistry and Astronomy were considered outstanding and their genesis and development were described. The weight of factors such as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometrics; Information services; Information storage and retrieval; Science; Scientometrics; Impact factor; Scientific policy; Scientific institutions; Brazil.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400018

Distribution, diversity, and habitat partitioning of Scolecitrichidae species (Copepoda: Calanoida) down to 1,200 m in the Southwestern Atlantic Ocean
Provedor de dados: 42
Autores: DIAS,CRISTINA O.; ARAUJO,ADRIANA V. DE; BONECKER,SÉRGIO L.C.
In this study, we analyzed the main distributional features of Scolecitrichidae species in the Southwestern Atlantic Ocean (northern region of Rio de Janeiro State) and determined and described their habitat partitioning, based on a night series of stratified samplings down to a depth of 1,200 m. A total of 18 species from seven genera were identified and grouped according to their depth distribution. Distinct vertical patterns of total density, richness, diversity, and evenness were observed, with a decrease in density and an increase in diversity and richness with increasing depth. The total scolecitrichid abundance was dominated by a few epipelagic migrant species (Scolecithrix danae, Scolecithricella minor, Amallothrix tenuiserrata, and Lophothrix...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copepoda; Scolecitrichid; Deep waters; Southwestern Atlantic Ocean; Tropical environment.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100611

Chemical studies on cultivation of Echinodorus grandiflorus (cham. &amp;amp; schl.) mich.
Provedor de dados: 42
Autores: Pimenta,Daniel S.; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200024

Optimization of Phenolics and Flavonoids Extraction Conditions and Antioxidant Activity of Roasted Yerba-Mate Leaves (Ilex paraguariensis A. St.-Hil., Aquifoliaceae) using Response Surface Methodology
Provedor de dados: 42
Autores: BASSANI,DÉBORA C.; NUNES,DOMINGOS S.; GRANATO,DANIEL.
This study focused on maximizing the extraction of total phenolics and flavonoids as well as the antioxidant activity measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay from roasted yerba mate (Ilex paraguariensis) as a function of time (5, 7.5 and 10 min) and temperature of extraction (60, 75 and 90°C). The data were subjected to Response Surface Methodology and the results showed that polynomial equations were significant, did not present lack of fit, and presented adjusted determination coefficients above 98%, proving their suitability for prediction purposes. Using the desirability function, the optimum operating conditions to obtain a higher extraction of antioxidants was found to be 10 min of extraction at 90°C, and the tea prepared under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenolic composition; Correlation analysis; Desirability function; Phytochemicals; Functional foods.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200923

The importance of fossil taxa in the knowledge of Neopterygian interrelationships
Provedor de dados: 42
Autores: BRITO,PAULO M.; MACHADO,LÚCIO P.C.; AMARAL,CESAR R.; MAYRINCK,DIOGO DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200014

New data on the Late Cretaceous lizard Dicothodon bajaensis (Squamata, Borioteiioidea) from Baja California, Mexico reveals an unusual tooth replacement pattern in squamates
Provedor de dados: 42
Autores: CHAVARRÍA-ARELLANO,MARÍA LUISA; SIMÕES,TIAGO R.; MONTELLANO-BALLESTEROS,MARISOL.
Abstract Borioteiioids comprise an extinct family of squamates that inhabited the Northern Hemisphere during the Cretaceous and were characterized by varying patterns of tooth replacement and dental morphology. Understanding the evolution of these tooth replacement patterns has, however, been largely hampered by an extremely fragmentary fossil record. Here we present new information on Dicothodon bajaensisfrom the Campanian of Baja California (Mexico), so far known only from isolated teeth and jaw fragments. Among abundant new materials there are ten maxillae and five dentaries belonging to distinct ontogenetic stages. Whereas juveniles display active tooth replacement, older specimens show no evidence of replacement. Dicothodon bajaensis is therefore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campanian; Dental morphology; Mexico; North America; Squamata; Tooth replacement.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602781

Immunohistochemical characterization of NMDA, kainic acid and aspartate-induced released of GABA in chick retina
Provedor de dados: 42
Autores: CALAZA,KARIN C.; MELLO,FERNANDO G. DE; GARDINO,PATRÍCIA F.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300025

On deformation of foliations with a center in the projective space
Provedor de dados: 42
Autores: MOVASATI,HOSSEIN.
Let &lt;img ALIGN="BOTTOM" src="http:/img/fbpe/aabc/v73n2/m4img1.gif"&gt; be a foliation in the projective space of dimension two with a first integral of the type &lt;img ALIGN="MIDDLE" src="http:/img/fbpe/aabc/v73n2/m4img2.gif"&gt;, where F and G are two polynomials on an affine coordinate, &lt;img ALIGN="MIDDLE" src="http:/img/fbpe/aabc/v73n2/m4img3.gif"&gt; = &lt;img ALIGN="MIDDLE" src="http:/img/fbpe/aabc/v73n2/m4img4.gif"&gt; and g.c.d.(p, q) = 1. Let z be a nondegenerate critical point of &lt;img ALIGN="MIDDLE" src="http:/img/fbpe/aabc/v73n2/m4img2.gif"&gt;, which is a center singularity of &lt;img ALIGN="BOTTOM" src="http:/img/fbpe/aabc/v73n2/m4img1.gif"&gt;, and &lt;img src="http:/img/fbpe/aabc/v73n2/ft.gif" alt="ft.gif (149 bytes)"...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic foliation; Limit cycle; Center singularity.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200004

Dominant yeasts associated to mango (Mangifera indica) and rose apple (Syzygium malaccense) fruit pulps investigated by culture-based methods
Provedor de dados: 42
Autores: RAMÍREZ-CASTRILLÓN,MAURICIO; USMAN,LUISA M.; SILVA-BEDOYA,LINA M.; OSORIO-CADAVID,ESTEBAN.
Abstract: The biotechnological potential of yeasts associated to different habitats in Colombia has been poorly studied, especially the yeasts associated with different plant structures. Fruit pulps are interesting substrates mainly for the growth of yeast species, that can positively affect the productivity and quality of some bioeconomic species. Therefore, the objective of this study was to identify the dominant yeast species associated with mango and rose apple fruit pulps in Cali, Colombia. A total of 90 isolates were obtained, which were grouped considering their colony morphology. The D1/D2 domain of the large ribosomal RNA gene (LSU rRNA gene) or internal transcribed spacer (ITS) 1, ribosomal gene 5.8S and ITS 2 (ITS) regions of one to several...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Syzygium malaccense; Molecular identification; Yeasts; Colombia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700626

The application of catalase for the elimination of hydrogen peroxide residues after bleaching of cotton fabrics
Provedor de dados: 42
Autores: AMORIM,ALEXANDRA M.; GASQUES,MARCELO D. G.; ANDREAUS,JÜRGEN; SCHARF,MAURO.
Results of dyeing of cotton fabrics with a bifunctional reactive dye were significantly improved when the fabric after bleaching with hydrogen peroxide was treated with catalase for the elimination of hydrogen peroxide residues from the fabrics. Compared to processes with a varying number of washing steps, with and without commercial reducing agents, the consumption of water could be significantly reduced, without altering the final color shade.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Peroxide bleaching; Cotton fabrics; Textile chemistry; Reactive dye; Dyeing.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300006

Germination of Croton urucurana L. seeds exposed to different storage temperatures and pre-germinative treatments
Provedor de dados: 42
Autores: Scalon,Silvana P.Q.; Mussury,Rosilda M.; Lima,Andréa A.
The present work evaluated the germinability and vigor of Croton urucurana seeds. 1) Seeds were sorted by color (caramel, gray and black) and were subjected to seven different pre-germination treatments followed by incubation at 20ºC, 25°C or 20/30°C. 2) Seeds were stored in cold chambers or at room temperature for up to 300 days and were subsequently incubated at 20/30ºC in a germination chamber or under greenhouse conditions. Only gray seeds showed significant germination rates. The highest first count percentages of total germination and the highest germination speed indices were observed in control seeds and in those which were treated with water or 200 mg. L-1 gibberellic acid for 12 hours. Seeds stored under refrigeration showed the highest values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gibberellic acid; Refrigeration; "sangra d'água".
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100020

Neurotransmitter regulation of neural development: acetylcholine and nicotinic receptors
Provedor de dados: 42
Autores: TORRÃO,ANDRÉA S.; BRITTO,LUIZ R.G.
Several neurotransmitter systems have been related to developmental processes during the past decade. In this review, we discuss the evidence that the nicotinic acetylcholine receptors could have an additional function during development that may be unrelated to their role in cholinergic neurotransmission in the vertebrate brain. Both temporal expression data and in vitro and in vivo studies with nicotinic agonists and antagonists have provided direct support for a role of nicotinic receptors in neural developmental processes such as neurite outgrowth and differentiation. A similar picture has emerged for other neurotransmitter and receptor systems as well, which generates a new view of neural processes during both development and mature life.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholine; Development; Neurotransmitters; Nicotine; Nicotinic receptors.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300008

Spectrophotometric determination of phenol in the presence of congeners by multivariated calibration
Provedor de dados: 42
Autores: SOUZA,KELY VIVIANE DE; PERALTA-ZAMORA,PATRICIO.
The generation of poly-hydroxilated transient species during the photochemical treatment of phenol usually impedes the spectrophotmetric monitoring of its degradation process. Frequently, the appearance of compounds such as pyrocatechol, hydroquinone and benzoquinone produces serious spectral interference, which hinder the use of the classical univariate calibration process. In this work, the use of multivariate calibration is proposed to permit the spectrophotometric determination of phenol in the presence of these intermediates. Using 20 synthetic mixtures containing phenol and the interferents, a calibration model was developed by using a partial least square regression process (PLSR) and processing the absorbance signal between 180 and 300 nm. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenol; Spectrophotometric determination; Multivariated calibration.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400005

An Investigation of a Mathematical Model for the Internal Velocity Profile of Conical Diffusers Applied to DAWTs
Provedor de dados: 42
Autores: BARBOSA,DISTERFANO L.M.; VAZ,JERSON R.P.; FIGUEIREDO,SÁVIO W.O.; SILVA,MARCELO DE OLIVEIRA E; LINS,ERB F.; MESQUITA,ANDRÉ L.A.
The Diffuser Augmented Wind Turbines (DAWTs) have been widely studied, since the diffusers improve the power coefficient of the wind turbine, particularly of small systems. The diffuser is a device which has the function of causing an increase on the flow velocity through the wind rotor plane due to pressure drop downstream, therefore resulting in an increase of the rotor power coefficient. This technology aids the turbine to exceed the Betz limit, which states that the maximum kinetic energy extracted from the flow is 59.26%. Thus, the present study proposes a mathematical model describing the behavior of the internal velocity for three conical diffusers, taking into account the characteristics of flow around them. The proposed model is based on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DAWTs; Diffusers; Wind energy; Biot-Savart's law.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201133

Comparison of acid and enzymatic hydrolysis of pectin, as inexpensive source to cell growth of Cupriavidus necator
Provedor de dados: 42
Autores: LOCATELLI,GABRIEL OLIVO; FINKLER,LEANDRO; FINKLER,CHRISTINE L.L.
﻿﻿﻿Abstract: The present work investigated what the appropriate methods of hydrolysis of pectin for reducing compounds (RCs) production, employed as a substrate for cell growth of Cupriavidus necator. This microorganism has great importance industrial, because besides potential single cell protein (SCP), is the most studied microorganism for production of polyhydroxybutyrate (PHB), and both processes require high cell concentration with inexpensive substrates For this, it was compared to acid and enzymatic hydrolysis procedures, through rotational central composite experimental design, using pectin concentration (1.0%). It was analyzed as a variable response for both experimental design, the RCs’ production. The best conditions of each procedure were used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cupriavidus necator; Galacturonic acid; Pectin depolymerization; Pectin hydrolysates; Polygalacturonase.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300605

Time evolution of the South Atlantic Magnetic Anomaly
Provedor de dados: 42
Autores: Hartmann,Gelvam A.; Pacca,Igor G.
The South Atlantic Magnetic Anomaly (SAMA) is one of the most outstanding anomalies of the geomagnetic field. The SAMA secular variation was obtained and compared to the evolution of other anomalies using spherical harmonic field models for the 1590-2005 period. An analysis of data from four South American observatories shows how this large scale anomaly affected their measurements. Since SAMA is a low total field anomaly, the field was separated into its nondipolar, quadrupolar and octupolar parts. The time evolution of the non-dipole/total, quadrupolar/total and octupolar/total field ratios yielded increasingly high values for the South Atlantic since 1750. The SAMA evolution is compared to the evolution of other large scale surface geomagnetic features...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geomagnetic field; Non-dipole field anomalies; Secular variation; South Atlantic Magnetic Anomaly.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200010

O(p + 1) x O(p + 1)-Invariant hypersurfaces with zero scalar curvature in euclidean space
Provedor de dados: 42
Autores: SATO,JOCELINO.
We use equivariant geometry methods to study and classify zero scalar curvature O(p + 1) x O(p + 1)-invariant hypersurfaces in R2p+2 with p &gt; 1.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equivariant geometry; Scalar curvature.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200001

Economic aspects of production of Caiman crocodilus yacare
Provedor de dados: 42
Autores: Carreira,Laura B.T.; Sabbag,Omar J.
The breeding of crocodilians is still a recent activity in Brazil. Its peak was in the 1990's, but it has gaps in its production, as there are no norms for the commercial breeding of these animals in captivity. However, its economic potential is great, and the search for ecological balance and viability of commercial production has become a challenge among farmers of this activity. Therefor, the objective of the study was to economically analyze the production of Caiman crocodilus yacareon a farm located in Caceres, state of Mato Grosso, identifying relevant items of costs in the activity, as well as the parameters related to the profitability and viability of the activity. The economic results for the breeding of this animal were positive, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caiman crocodilus yacare; Costs; Economic viability; Herpetology; Fitability.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100495

First report of multiple anthelmintic resistance in nematodes of sheep in Colombia
Provedor de dados: 42
Autores: Gárcia,Carlos M.B.; Sprenger,Lew K.; Ortiz,Efraín B.; Molento,Marcelo B.
This study aimed to report the presence of parasites resistant to the most used anthelmintic drugs in sheep in Colombia. Four farms (denominated farm 1, 2, 3 and 4) were selected where the animals were not treated with anthelmintics for two months before the trial. Animals with faecal egg count (FEC) above 150 and of different ages were allocated into six groups, each consisting of at least 5 animals. The drugs and dosages used were: ivermectin 1% (0.2 mg/kg), albendazole 25% (5 mg/kg), fenbendazole 10% (5 mg/kg), levamisole 10% (5 mg/kg), and moxidectin 1% (0.2 mg/kg). Anthelmintic efficacy was determined by the FEC reduction test (FECRT) with a second sampling 14 days post-treatment. The efficacy of albendazole and fenbendazole at farm 1 was above 95%,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drug resistance; EPG; FECRT; Helminth.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100397

Effects of electroacupuncture on stress and anxiety-related responses in rats
Provedor de dados: 42
Autores: BASSETTO,RICARDO M.; WSCIEKLICA,TATIANA; POUZA,KATHLEIN C.P.; ORTOLANI,DANIELA; VIANA,MILENA B.; CESPEDES,ISABEL C.; SPADARI,REGINA C.
ABSTRACT The aim of this work was to investigate if eletroacupuncture at PC6 would modulate the stress-induced anxiety-like behavior and the level of activation of several brain areas. Rats were distributed in groups: control; submitted to immobilization; submitted to immobilization and eletroacupuncture at PC6 or at the tail. Immobilization increased grooming and decreased stretched attend postures and the time spent in the open arms of the ele-vated plus-maze. Eletroacupuncture at PC6 or tail canceled the effect of immobilization on grooming and attenuated the stretched attend posture. Immobilization increased Fos-immunoreactivity in the prefrontal cortex, medial and central amygdala, paraventricular and dorsomedial nuclei of the hypothalamus, lateral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stress; Electroacupuncture; Anxiety; Elevated plus-maze; Fos-immunoreactivity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301003

Innateness and the instinct to learn
Provedor de dados: 42
Autores: Marler,Peter.
Concepts of innateness were at the heart of Darwin's approach to behavior and central to the ethological theorizing of Lorenz and, at least to start with, of Tinbergen. Then Tinbergen did an about face, and for some twenty years the term 'innate' became highly suspect. He attributed the change to Lehrman's famous 1953 critique in which he asserted that classifying behaviors as innate tells us nothing about how they develop. Although Lehrman made many valid points, I will argue that this exchange also led to profound misunderstandings that were ultimately damaging to progress in research on the development of behavior. The concept of 'instincts to learn', receiving renewed support from current theorizing among geneticists about phenotypic plasticity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Innateness; Song learning; Phenotypic plasticity; Behavioral genetics; Tinbergen's four questions.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200002

Technique of spinal cord compression induced by inflation of epidural balloon catheter in rabbits (Oryctologus cuniculus): efficient and easy to use model
Provedor de dados: 42
Autores: FONSECA,ANTONIO F.B. DA; SCHEFFER,JUSSARA P.; COELHO,BARBARA P.; AIELLO,GRACIANE; GUIMARÃES,ARTHUR G.; GAMA,CARLOS R.B.; VESCOVINI,VICTOR; CABRAL,PAULA G.A.; OLIVEIRA,ANDRÉ L.A.
ABSTRACT The most common cause of spinal cord injury are high impact trauma, which often result in some motor impairment, sensory or autonomic a greater or lesser extent in the distal areas the level of trauma. In terms of survival and complications due to sequelae, veterinary patients have a poor prognosis unfavorable. Therefore justified the study of experimental models of spinal cord injury production that could provide more support to research potential treatments for spinal cord injuries in medicine and veterinary medicine. Preclinical studies of acute spinal cord injury require an experimental animal model easily reproducible. The most common experimental animal model is the rat, and several techniques for producing a spinal cord injury. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental; Neuro-traumatology; Paraplegia; Rabbits.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401511

Osmotic conditioning and shading on the germination and on the initial growth of Myracrodruon urundeuva Allemão seedlings
Provedor de dados: 42
Autores: SCALON,SILVANA P.Q.; MOTA,LEANDRO H.S.; MUSSURY,ROSILDA M.
The present work aimed to evaluate the osmotic conditioning and shading on the germination and on the initial growth of aroeira seedlings. The seeds were pre-imbibed in solutions with different concentrations of PEG (polyethylene glycol) and KNO3 and incubated at 10°C and 20°C temperatures, during 0 (control), 12 and 24 hours. After these periods, the seeds were dried until they reached the initial levels of humidity. After that, they were put for germinating in BOD (Biochemical Oxygen Demand) chambers, at alternated 20-30°C. The control treatment and the pre-conditionings that presented the best results in BOD germination were selected, PEG (-1.0 MPa) + KNO3 (-1.0 MPa) and KNO3 (-1.0 MPa), with pre-imbibition for 12 h and incubated in BOD at 20°C. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aroeira; Anacardiaceae; Cerrado; Shading; PEG 6000 and KNO3.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200799

Geochemical modeling of gold precipitation conditions in the Bloco do Butiá Mine, Lavras do Sul/Brazil
Provedor de dados: 42
Autores: Mexias,André S.; Berger,Gilles; Gomes,Márcia E.B.; Formoso,Milton L.L.; Dani,Norberto; Frantz,José C.; Bongiolo,Everton M.
A geochemical modeling of gold deposition was performed using the EQ3/EQ6 software package using conditions inferred from geological, petrographic, geochemical and fluid inclusion data from the Bloco do Butiá gold mine, Lavras do Sul, RS. Gold in the mine occurs only in the pyrite structure (invisible gold). The pyrite occurs associated with white mica (phengite) in the zone of phyllic alteration. The process of gold deposition showed to be related to temperature and pH decrease. The pH decrease was fundamental to gold deposition by destabilization of sulfur species [Au(HS)2- , HAu(HS)2(0) and Au(HS)0] dissolved in the aqueous solution, being Au(HS)0 the main gold transporting complex. The addition of KCl is hard to accept as cause of gold precipitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochemical modeling; Gold; Pyrite; Sulfur; Fluid-rock interaction.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400010

Effect of host and environment-related factors on fleas of the pichi, an armadillo from Argentina
Provedor de dados: 42
Autores: EZQUIAGA,MARIA CECILIA; RIOS,TATIANA A.; ACTIS,ESTEBAN A.; CASSINI,GUILLERMO H.; ABBA,AGUSTIN M.; SUPERINA,MARIELLA.
Abstract  The pichi (Zaedyus pichiy; Cingulata: Chlamyphoridae) is an armadillo whose ectoparasite fauna is composed of ticks and fleas. Fleas were collected from 218 pichis in southern Mendoza, Argentina, in summer and winter of 2015 and 2016. Prevalences were analyzed and differences in the intensities of the total number of fleas related to host (age, sex, weight, size and physical condition) and environment-related (seasonality and year) factors evaluated. Phthiropsylla agenoris was the only species found. Intensities of fleas were higher in 2015, in juveniles, and in males. Individuals with poor physical condition were more parasitized than those with good or normal body condition. The main explanatory variable was sampling year. This factor was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ENSO; Environmental conditions; Mendoza province; Phthiropsylla agenoris.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300702

Oregano essential oil (Origanum vulgare) to feed laying hens and its effects on animal health
Provedor de dados: 42
Autores: MIGLIORINI,MARCOS J.; BOIAGO,MARCEL M.; ROZA,LENILSON F.; BARRETA,MAURICIO; ARNO,ALESSANDRA; ROBAZZA,WEBER S.; GALVÃO,ALESSANDRO C.; GALLI,GABRIELA M.; MACHADO,GUSTAVO; BALDISSERA,MATHEUS D.; WAGNER,ROGER; STEFANI,LENITA C.M.; SILVA,ALEKSANDRO S. DA.
Abstract Abstract: This study evaluated the effect of oregano essential oil added to the feed of commercial laying hens. This research was focused on the analysis of biochemical changes linked to hepatic function, and protein and lipid metabolism. It was used 240 laying hens (59 weeks-old) distributed in a completely randomized design of six treatments (five repetitions with eight birds each). The experiments were constituted by a control treatment (CT) with the inclusion of zinc bacitracin and five treatments of oregano essential oil (OEO: 0, 50, 100, 150, and 200 mg.kg-1), respectively. After 28 days of feeding, an increase on serum levels of total proteins and globulins was observed on groups T150 and T200, as well as an increase on albumin levels on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Albumin; Cholesterol; Globulin; Total proteins; Triglycerides; Health.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100802

Gravimetric structure for the abyssal mantle massif of Saint Peter and Saint Paul peridotite ridge, Equatorial Atlantic Ocean, and its relation to active uplift
Provedor de dados: 42
Autores: MOTOKI,KENJI F.; MOTOKI,AKIHISA; SICHEL,SUSANNA E.
This paper presents gravimetric and morphologic analyses based on the satellite-derived data set of EGM2008 and TOPEX for the area of the oceanic mantle massif of the Saint Peter and Saint Paul peridotite ridge, Equatorial Atlantic Ocean. The free-air anomaly indicates that the present plate boundary is not situated along the longitudinal graben which cuts peridotite ridge, but about 20 km to the north of it. The high Bouguer anomaly of the peridotite ridge suggests that it is constituted mainly by unserpentinised ultramafic rocks. The absence of isostatic compensation and low-degree serpentinisation of the ultramafic rocks indicate that the peridotite ridge is sustained mainly by active tectonic uplift. The unparallel relation between the transform fault...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mantle exhumation; Saint Peter and Saint Paul peridotite ridge; Satellite gravimetry; Serpentinization; Submarine geomorphology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200571

Analysis of pollen load based on color, physicochemical composition and botanical source
Provedor de dados: 42
Autores: Modro,Anna F.H.; Silva,Izabel C.; Luz,Cynthia F.P.; Message,Dejair.
Pollen load samples from 10 hives of Apis mellifera (L.) were analyzed based on their physicochemical composition and botanical source, considering color as a parameter for quality control. In seven samples it was possible to establish the occurrence of more than 80% of a single pollen type, characterizing them as unifloral but with protein content variation. One of the samples was exclusively composed of saprophytic fungi (Cladosporium sp.). Comparing the mean results of the fungi loads with those of the nutritional components of pollen load, the former presented higher protein, mineral matter and dry matter and lower organic matter, ethereal extract and total carbohydrate values. The monochromatic samples met the physicochemical specifications regulating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Bees; Food source; Nutritional analysis; Palynology.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200014

Multivariate analysis relating milk production, milk composition, and seasons of the year
Provedor de dados: 42
Autores: HAYGERT-VELHO,IONE M.P.; CONCEIÇÃO,GABRIEL M. DA; COSMAM,LUIZ C.; ALESSIO,DILETA R.M.; BUSANELLO,MARCOS; SIPPERT,MICHELI R.; DAMIANI,CÁSSIA; ALMEIDA,ANA PAULA A.; VELHO,JOÃO PEDRO.
Abstract Our objective was to quantify the relationship between seasons of the year, milk production, and milk composition of a dairy farm based on data for 48 consecutive months, using multivariate statistical analyses. The dataset contained information on productive indexes and milk composition from the bulk tank milk, which was measured from milk samples, collected monthly and used to determine the total dry extract and defatted dry extract, lactose, fat, protein, somatic cell count, and total bacterial count. Seasons of the year and milk production/hectare were also considered. Factor, cluster, and discriminant analysis were used to study the relationships between the above-mentioned variables. A positive relationship was noted between season and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Farm management; Milk quality; Productivity; Somatic cell count; Statistics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703839

Estimating of gross primary production in an Amazon-Cerrado transitional forest using MODIS and Landsat imagery
Provedor de dados: 42
Autores: DANELICHEN,VICTOR H.M.; BIUDES,MARCELO S.; VELASQUE,MAÍSA C.S.; MACHADO,NADJA G.; GOMES,RAPHAEL S.R.; VOURLITIS,GEORGE L.; NOGUEIRA,JOSÉ S.
The acceleration of the anthropogenic activity has increased the atmospheric carbon concentration, which causes changes in regional climate. The Gross Primary Production (GPP) is an important variable in the global carbon cycle studies, since it defines the atmospheric carbon extraction rate from terrestrial ecosystems. The objective of this study was to estimate the GPP of the Amazon-Cerrado Transitional Forest by the Vegetation Photosynthesis Model (VPM) using local meteorological data and remote sensing data from MODIS and Landsat 5 TM reflectance from 2005 to 2008. The GPP was estimated using Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) calculated by MODIS and Landsat 5 TM images. The GPP estimates were compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Basin; Cerrado; Carbon cycle; Climate change; Deforestation; Ecosystem function.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401545

Evaluation of antimicrobial activity of the endophytic actinomycete R18(6) against multiresistant Gram-negative bacteria
Provedor de dados: 42
Autores: Carvalho,Tiele; Van Der Sand,Sueli.
Endophytic actinomycetes are promising sources of antimicrobial substances. This study evaluates the activity of metabolites produced by the endophytic actinomycete R18(6) against Gram-negative bacteria multiresistant to antimicrobials. R18(6) isolate was grown in submerged cultures under different conditions: carbon source, temperature, pH and incubation time to optimize antimicrobials production. The actinomycete grown in base medium supplemented with 1% glucose, pH 6.5 and incubation at 30 ºC for 96 h with shaking at 100 rpm, exhibited the highest activity against the used Gram-negative bacteria. Minimum inhibitory concentration (MIC) of the crude extract produced by the microorganism varied between 1/32 and 1/256. It had bactericide or bacteriostatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endophytic actinomycetes; Streptomyces; Multiresistant Gram-negative bacteria; Extract.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100155

Morphogenetic characteristics of three Brachiaria brizantha cultivars submitted to nitrogen fertilization
Provedor de dados: 42
Autores: Silva,Marcos F; Porto,Edson M. V; Alves,Dorismar D; Vitor,Cláudio M.T; Aspiazú,Ignacio.
This study aims to evaluate the morphogenetic characteristics of three cultivars of Brachiaria brizantha subjected to nitrogen fertilization. The design was a randomized block in factorial arrangement 4x3; three cultivars of B. brizantha - Marandu, Piatã, Xaraés and four nitrogen levels - 0, 80, 160 and 240 kg/ha, with three replications. The experimental units consisted of plastic pots filled with 5 dm3 of soil. Thereupon the establishment fertilization, varieties were sowed directly in the pots, leaving, after thinning, five plants per pot. Forty-five days after planting, it was done a standardization cut at 10 cm tall. Nitrogen levels were distributed according to the treatments, divided in three applications. The morphogenetic characteristics were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cv. Marandu; Cv. Piatã; Cv. Xaraés; Morphogenesis; Signal grass.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100371

The Brazilian time and frequency atomic standards program
Provedor de dados: 42
Autores: Ahmed,Mushtaq; Magalhães,Daniel V.; Bebeachibuli,Aida; Müller,Stella T.; Alves,Renato F.; Ortega,Tiago A.; Weiner,John; Bagnato,Vanderlei S.
Cesium atomic beam clocks have been the workhorse for many demanding applications in science and technology for the past four decades. Tests of the fundamental laws of physics and the search for minute changes in fundamental constants, the synchronization of telecommunication networks, and realization of the satellite-based global positioning system would not be possible without atomic clocks. The adoption of optical cooling and trapping techniques, has produced a major advance in atomic clock precision. Cold-atom fountain and compact cold-atom clocks have also been developed. Measurement precision of a few parts in 10(15) has been demonstrated for a cold-atom fountain clock. We present here an overview of the time and frequency metrology program based on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atomic clock; Cold atoms; Time and frequency; Metrology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200002

Wave energy distribution at inlet channel margins as a function of ebb tidal delta morphology: Cananéia Inlet, São Paulo, Brazil
Provedor de dados: 42
Autores: AMBROSIO,BRUNA G.; SOUSA,PAULO H.G.O.; GAGLIARDI,MARCELO H.; SIEGLE,EDUARDO.
Abstract  Wave energy gradients between and along the margins of inlet channels play an important role in defining the inlet margins’ evolutionary processes, mainly those related to spit erosion or accretion, and inlet migration. The aim of this study is to understand the wave power distribution along the margins of a tidal inlet (Cananéia inlet, São Paulo, Brazil), its variation over time, and the influences of the ebb tidal delta morphology on the incoming waves. To evaluate changes in bathymetry and morphology of submersed features, we apply geoprocessing techniques to analyze nautical charts from the Brazilian Navy from 1939, 1971, 1985 and 2004. The numerical model MIKE21 SW was applied to assess wave propagation and nearshore wave power. Hence, wave...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wave action; Ebb tidal delta; Tidal inlet; Numerical modeling.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100602

Nutrition facts and limits for micronutrients in tree species used in urban forestry
Provedor de dados: 42
Autores: BRUN,FLÁVIA G.K.; BRUN,ELEANDRO J.; GERBER,DIONATAN; SZYMCZAK,DENISE A.; LONDERO,EDUARDO K.; MEYER,EVANDRO A.; NAVROSKI,MÁRCIO C.
ABSTRACT There is a huge lack of researches that evaluate the nutritional limits in tree species used in urban forestry, especially in terms of micronutrients. This study aimed to establish limits and range of micronutrients levels for the proper development of tree species utilized in urban forestry. The study was conducted in the city of Santa Maria-RS-Brazil. Through forest inventory, 23 forest species present in urban forest were selected, and 05 vegetative branches of each tree were collected, in which the contents of B, Cu, Fe, Mn and Zn were analyzed. Ranges of micronutrients’ contents were developed for class limits criteria. Nutritional problems were detected for B, Cu and Zn in G. robusta and S. cumini, indicating a need of fertilization and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest species; Urban forestry; Forest nutrition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401881

Chemical constituents of apolar fractions from fruit latex of twelve Clusia species (Clusiaceae)
Provedor de dados: 42
Autores: CAMARA,CLAUDIO A.G. DA; MARSAIOLI,ANITA J.; BITTRICH,VOLKER.
Abstract The apolar fractions components of fruit latex of twelve species of Clusia belonging to four different taxonomic sections were examined by GC-MS. The latex of Clusia is characterised by large amounts of sesquiterpene hydrocarbons as major constituents like germacrene D: C. paralicola (44.28 %), C. criuva subsp. criuva (29.03 %); β-caryophyllene: C. fluminensis (35.61 %), C. lanceolata (36.39 %), C. hilariana (58.10 %); α-trans-bergamontene: C. spirictus-sanctensis (36.30 %); α-bulnesene: C. weddelliana (25.61 %); bicyclogermacrene: C. panapanari (25.93 %) and trans-β-farnesene: C. nemorosa (24.63 %), while C. grandiflora is composed of 42.16 % monoterpene hydrocarbons. Verbenone (31.91 %) was the major component. In contrast, C. rosea, C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clusia spp; Latex; Apolar fraction; Β-caryophyllene; Verbenone.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501919

Metal content and distribution in surface sediments in an industrial region
Provedor de dados: 42
Autores: SCHNEIDER,ISMAEL L.; TEIXEIRA,ELBA C.; RODRIGUES,MARIA LUCIA K.; ROLIM,SILVIA B.A.
The present study aimed to evaluate Cu, Cr, Ni, Zn, Pb, Mn, Al, and Fe contents, as well as their geochemical partitioning in Sinos River basin sediments in southern Brazil. This basin is a densely populated area with a substantial number of industries, especially metallurgy, electroplating works, steel mills, petrochemicals, and tanneries. The total metal concentrations were determined by X-ray fluorescence and the sediment phase concentrations were determined by applying the BCR-701 sequential extraction method proposed by the Community Bureau of Reference of the European Community, using ICP/OES. The contents extracted by a solution of 0.5 mol/L HCl were also considered. Metal contents were evaluated in the sediment fraction &lt;63 µm. Results in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BCR-701; Metals; Sediment; Sequential extraction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301043

Biogeochemical processes and the diversity of Nhecolândia lakes, Brazil
Provedor de dados: 42
Autores: Almeida,Teodoro I. R; Calijuri,Maria do Carmo; Falco,Patrícia B; Casali,Simone P; Kupriyanova,Elena; Paranhos Filho,Antonio C; Sigolo,Joel B; Bertolo,Reginaldo A.
The Pantanal of Nhecolândia, the world's largest and most diversified field of tropical lakes, comprises approximately 10,000 lakes, which cover an area of 24,000 km² and vary greatly in salinity, pH, alkalinity, colour, physiography and biological activity. The hyposaline lakes have variable pHs, low alkalinity, macrophytes and low phytoplankton densities. The saline lakes have pHs above 9 or 10, high alkalinity, a high density of phytoplankton and sand beaches. The cause of the diversity of these lakes has been an open question, which we have addressed in our research. Here we propose a hybrid process, both geochemical and biological, as the main cause, including (1) a climate with an important water deficit and poverty in Ca2+ in both superficial and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal; Alkaline lakes; Saline lakes; Cyanobacteria; Alkalinization processes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200004

The theorical-methodological construction of theses and dissertations and their epistemological problems
Provedor de dados: 42
Autores: GOMES,RODRIGO DUTRA.
Abstract: This essay discusses the problem of the lack of dialogue between theory/empirical reality in the construction of the theoretical structure of dissertations and doctorates in Human Sciences in Brazil; taking Geography as an example, Santos (2000) observed this problem, which persists at the national level. The proposal is to present the question and to suggest the relationship between theory/empirical reality coming of the dialogue with specific research questions. It is these research questions that will define the limitations, factors, agents, processes and structures that will be studied. The relationship between the construction of the theoretical references with specific problems allowing theoretical-methodological advances, thus adapting the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Empirical theory; Research questions; Methodological theory; Human science.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000101002

The Tectonic interaction between the Paramirim Aulacogen and the Araçuaí Belt, São Francisco craton region, Eastern Brazil
Provedor de dados: 42
Autores: Cruz,Simone C.P.; Alkmim,Fernando F.
The Paramirim aulacogen, hosted in the northern part of the São Francisco craton, corresponds to two superimposed and partially inverted rifts of Paleo and Neoproterozoic ages. The Rio Pardo salient of the Araçuaí belt defines the local limit of the craton and interferes with the aulacogen structures. In order to understand the mechanism and timing of the tectonic interaction between these tectonic features during the inversion processes, a structural analysis was undertaken in the southern Paramirim aulacogen and along the Rio Pardo salient. The results obtained indicate that the Rio Pardo salient formed during an early stage of closure of the Neoproterozoic Macaúbas rift system and consequent initiation of the Araçuaí orogen. The orogenic front...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araçuaí-West Congo orogen; Araçuaí belt; Paramirim aulacogen; Brasiliano event.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100014

Past and current sediment dispersion pattern estimates through numerical modeling of wave climate: an example of the Holocene delta of the Doce River, Espírito Santo, Brazil
Provedor de dados: 42
Autores: Bittencourt,Abílio C.S.P.; Dominguez,José M.L.; Martin,Louis; Silva,Iracema R.; de-Medeiros,Karla O.P.
This paper presents a numerical modeling estimation of the sediment dispersion patterns caused by waves inciding through four distinct coastline contours of the delta plain of the Doce River during the Late Holocene. For this, a wave climate model based on the construction of wave refraction diagrams, as a function of current boundary conditions, was defined and was assumed to be valid for the four coastlines. The numerical modeling was carried out on basis of the refraction diagrams, taking into account the angle of approximation and the wave height along the coastline. The results are shown to be comparable with existing data regarding the directions of net longshore drift of sediments estimated from the integration of sediment cores, interpretation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Past and current sediment dispersion; Wave refraction; Numerical modeling; Holocene; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200014

Handling sticky Resin by Stingless Bees: Adhesive Properties of Surface Structures
Provedor de dados: 42
Autores: GASTAUER,MARKUS; CAMPOS,LUCIO A.O.; WITTMANN,DIETER.
Many Stingless Bees (Hymenoptera: Meliponini) like Tetragonisca angustula collect resin to defend their nests against intruders like ants or Robber Bees. Small portions of resin are attached to intruders bodies and extremities causing their immobilization. It has been observed that resin is removed easily from the bee's mandible but adheres strongly to the intruder's cuticle. We tested the hypothesis that resin sticks lesser to the mandibles of Stingless Bees than to the surface of intruders due to special surface structures or adhesive properties of these structures. The surface structures of the mandible of T. angustula and the trochanter of Camponotus sericeiventris were studied by scanning electron microscopy. To measure adhesion properties, selected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Measuring adhesion forces; Scanning electron microscopy; Surface properties; Cuticle; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301189

Bacillus subtilis as a tool for vaccine development: from antigen factories to delivery vectors
Provedor de dados: 42
Autores: Ferreira,Luís C.S.; Ferreira,Rita C.C.; Schumann,Wolfgang.
Bacillus subtilis and some of its close relatives have a long history of industrial and biotechnological applications. Search for antigen expression systems based on recombinant B. subtilis strains sounds attractive both by the extensive genetic knowledge and the lack of an outer membrane, which simplify the secretion and purification of heterologous proteins. More recently, genetically modified B. subtilis spores have been described as indestructible delivery vehicles for vaccine antigens. Nonetheless both production and delivery of antigens by B. subtilis strains face some inherent obstacles, as unstable gene expression and reduced immunogenicity that, otherwise, can be overcome by already available gene technology approaches. In the present review we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vaccines; Bacillus subtilis; Immunization; Protein expression.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100009

Growth and biochemical variables in Amazon catfish ( Pseudoplatystoma reticulatum ♀ x Leiarius marmoratus ♂) under different water pH
Provedor de dados: 42
Autores: LEMOS,CARLOS HENRIQUE P.; CHUNG,SAMANTHA; RIBEIRO,CLÁUDIO V.M.; COPATTI,CARLOS EDUARDO.
Abstract Although fish may live in different aquatic environments, variations in the water quality parameters, mainly pH, may have a substantial impact in their development and welfare. The objective of this study was to test the effect of different pH levels on the growth performance and biochemical variables in Amazon catfish juveniles (Pseudoplatystoma reticulatum x Leiarius marmoratus). Fish were subjected to four different water pH levels (4.56, 6.0, 7.24, and 8.90) for 40 days. The total ammonia and alkalinity were higher and lower, respectively, in the treatments with water pHs 4.56 and 6.00 than at the other water pH levels. The un-ionized ammonia was higher at water pH 8.90 than at the other water pH levels. Amazon catfish exposed to water pH 4.56...
Tipo: Info:eu-repo/semantics/article
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703573

Potentialities and limitations of agricultural use in soils of semi-arid region of the state of Bahia
Provedor de dados: 42
Autores: QUEIROZ,ALEXSANDRA F. DE; SALVIANO,ALESSANDRA M.; CUNHA,TONY J.F. DA; OLSZEVSKI,NELCI; SOUZA JÚNIOR,VALDOMIRO S. DE; OLIVEIRA NETO,MANOEL B. DE.
Abstract The objective of this study was to evaluate the potentialities and limitations of the agricultural use of representative classes of semi-arid regions of the state of Bahia, based on the pedological and evaluation of their soil characteristics. Five areas were selected where trenches were opened to collect samples for the analyses: Eutric Haplustept which presents vulnerability to physical and chemical degradation due to poor drainage with risks of erosion, waterlogging, salinization and compaction but having good natural fertility; Abrupt Kandiustalf with high vulnerability to physical degradation due to the presence of gravel and pebbles which may limit the development of deep rooting plants and mechanization but also with good natural fertility;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sustainable; Soil quality; Physical attributes; Use limitations; Soil degradation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703373

Molecular basis of mammalian cell invasion by Trypanosoma cruzi
Provedor de dados: 42
Autores: Yoshida,Nobuko.
Establishment of infection by Trypanosoma cruzi, the agent of Chagas' disease, depends on a series of events involving interactions of diverse parasite molecules with host components. Here we focus on the mechanisms of target cell invasion by metacyclic trypomastigotes (MT) and mammalian tissue culture trypomastigotes (TCT). During MT or TCT internalization, signal transduction pathways are activated both in the parasite and the target cell, leading to Ca2+ mobilization. For cell adhesion, MT engage surface glycoproteins, such as gp82 and gp35/50, which are Ca2+ signal-inducing molecules. In T. cruzi isolates that enter host cells in gp82-mediated manner, parasite protein tyrosine kinase as well as phospholipase C are activated, and Ca2+ is released from I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Trypomastigotes; Cell invasion; Signal transduction; Ca2+ mobilization.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100010

A comparative study: use of a Brain-computer Interface (BCI) device by people with cerebral palsy in interaction with computers
Provedor de dados: 42
Autores: Heidrich,Regina O.; Jensen,Emely; Rebelo,Francisco; Oliveira,Tiago.
ABSTRACT This article presents a comparative study among people with cerebral palsy and healthy controls, of various ages, using a Brain-computer Interface (BCI) device. The research is qualitative in its approach. Researchers worked with Observational Case Studies. People with cerebral palsy and healthy controls were evaluated in Portugal and in Brazil. The study aimed to develop a study for product evaluation in order to perceive whether people with cerebral palsy could interact with the computer and compare whether their performance is similar to that of healthy controls when using the Brain-computer Interface. Ultimately, it was found that there are no significant differences between people with cerebral palsy in the two countries, as well as between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brain-computer Interface (BCI); Cerebral palsy; Cognitive ergonomics; Interaction.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501929

A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Upper Cretaceous of Shandong, China
Provedor de dados: 42
Autores: ZHANG,JIALIANG; WANG,XIAOLIN; WANG,QIANG; JIANG,SHUNXING; CHENG,XIN; LI,NING; QIU,RUI.
ABSTRACT A new saurolophine hadrosaurid, Laiyangosaurus youngi gen. et sp. nov. is described and phylogenetically analyzed based on several cranial elements from the Jingangkou Formation, Wangshi Group, Upper Cretaceous of Laiyang, Shandong, China. Laiyangosaurus youngi differs from other members of the saurolophine clade on the basis of a number of autapomorphies, including a prominent and narrow ridge on the lateral side of the nasal which forms the posterodorsal and posterior margin of the circumnasal depression, a primary ridge that runs along most of the maxillary tooth row that is slightly deflected posteriorly, a retroarticular process of the surangular that is dorsolateroposteriorlly recurved, and orbital margins that are wider than the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Upper Cretaceous; Wangshi Group; Laiyangosaurus youngi; Saurolophinae; Shandong; China.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400503

A new interpretation on the Sergipano belt domain
Provedor de dados: 42
Autores: SILVA-FILHO,MARINHO A.; TORRES,HELTON H. F.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300049

Effect of the intake of high or low glycemic index high carbohydrate-meals on athletes’ sleep quality in pre-game nights
Provedor de dados: 42
Autores: DANIEL,NATÁLIA V.S.; ZIMBERG,IONÁ Z.; ESTADELLA,DEBORA; GARCIA,MÁRCIA C.; PADOVANI,RICARDO C.; JUZWIAK,CLAUDIA R.
Abstract: This study investigated the effect of the intake of high (HGI) or low glycemic index (LGI) high-carbohydrate meals on athletes’ sleep. Nine basketball adult male athletes were assessed during a championship and received high-carbohydrate meals (dinner and evening snack) with HGI or LGI. Quantitative and qualitative sleep variables were assessed: sleep latency (LAT), sleep efficiency (EFIC), Wake After Sleep Onset (WASO), sleep time through actigraphy and sleep diary. Dietary intake, satiety, sleepiness, glycemic response, salivary cortisol and melatonin were also assessed. On both days most athletes had LAT and WASO higher than recommendation, and nocturnal sleep time below the recommendations. There was no difference between sleep and hormonal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sleep; Glycemic index; Athletes; Dietetics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100808

Acetylcholinesterase inhibition and antimicrobial activity of hydroxyl amides synthesized from natural products derivatives
Provedor de dados: 42
Autores: BOAVENTURA,MARIA AMÉLIA D.; XAVIER,LAURA F.W.; VIEIRA,HENRIETE S.; TAKAHASHI,JACQUELINE A.; NASCIMENTO JUNIOR,WILTON J.D.; ARAUJO,TAMIRES P.; COELHO,AMANDA C.S.
ABSTRACT Thirteen natural products derivatives of hydroxyl amide class, three described for the first time, were synthesized by reaction of three indole acids and 3,4,5-trimethoxybenzoic acid with six different amino alcohols in the presence of triphenylphosphine and N-bromosuccinimide. The derivatives were tested against the Gram (+) bacteria Staphylococcus aureus and Bacillus cereus, Gram (-) Pseudomonas aeruginosa and Escherichia coli, besides the yeast Candida albicans. One of the compounds (7) was selectively active against C. albicans (91.3 ± 0.49% inhibition) showing a great potential as a new drug lead, since it was more active than the positive control, miconazole (88.7 ± 2.41% inhibition). Regarding bacterial inhibition, compounds demonstrated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase inhibition antimicrobial activity indole acid derivatives 3; 4; 5-trimethoxybenzoic acid derivatives.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501945

Acute and chronic toxicity of the benzodiazepine diazepam to the tropical crustacean Mysidopsis juniae
Provedor de dados: 42
Autores: SILVA,ALLYSON Q. DA; NILIN,JEAMYLLE; LOUREIRO,SUSANA; COSTA-LOTUFO,LETICIA V.
Abstract  Pharmaceuticals occur in the environment due to their excessive consumption and the inefficiency of treatment plants to degrade, inactivate or remove them. Diazepam (DZP) stands out as the most consumed benzodiazepine, and induces sedative effects and reduces anxiety. Considering its potential appearance in several environmental compartments, the aim of the present study was to determine the effects of DZP under acute and chronic exposures on the mysid Mysidopsis juniae. Mortality was assessed using an acute toxicity test and a LC50 of 3.7 ± 0.5 mg·L-1was derived. The mass and length of the mysids was recorded in the chronic exposure to test for sublethal effects, and concentrations of 0.25 and 0.5 mg·L-1 of DZP affected mysids length and dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emerging contaminants; Mysids; Sublethal effects; Pharmaceuticals.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100713

EDITORIAL NOTE: Special Volume by the Affiliated Members of the Brazilian Academy of Sciences
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200101

Role of laminin bioavailability in the astroglial permissivity for neuritic outgrowth
Provedor de dados: 42
Autores: TARDY,MARCIENNE.
The mechanisms involved in the failure of an adult brain to regenerate post-lesion remain poorly understood. The reactive gliosis which occurs after an injury to the CNS and leads to the glial scar has been considered as one of the major impediments to neurite outgrowth and axonal regeneration. A glial scar consists mainly of reactive, hypertrophic astrocytes. These reactive cells acquire new properties, leading to A non-permissive support for neurons. Astrogial reactivity is mainly characteriized by a high overexpression of the major component of the gliofilaments, the glial fibrillary acidic protein (GFAP). This GFAP overexpression is related to the astroglial morphological response to injury. We hypothesized that modulation of GFAP synthesis, reversing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astrogliosis; Neuro-glia interactions; Neurite outgrowth; Neuronal migration; Laminin; Metalloproteinases.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400009

Phenotypic stability of hybrids of Gália melon in Rio Grande do Norte state, Brazil
Provedor de dados: 42
Autores: Nunes,Glauber H.S.; Santos Júnior,Haroldo; Grangeiro,Leilson C.; Bezerra Neto,Francisco; Dias,Carlos T.S.; Dantas,Mara S.M.
The objectives of this study were to determine the importance of simple and complex components of the interaction genotype × environment and to evaluate the adaptability and stability of Gália melon hybrids. Nine hybrids were tested in twelve environments of Rio Grande Norte State from 2000 to 2001. The experiments were carried out in a randomized complete block design with three replications. The statistical methods of Toler and Burrows, Wricke and AMMI (Additive Main effect and Multiplicative Interaction) were used to study the adaptability and stability. The complex component is responsible for most of the genotype × environment interaction for the yield and content of solids soluble of fruits. The environments associated with Mossoró and Assu...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Genotype × environment interaction; AMMI analysis; Non-linear grouping protocol; Hybrids.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400029

Population structure of Callichirus major (Say 1818) (Crustacea: Callianassidae) and conservation considerations at Southeast coast of São Paulo, Brazil
Provedor de dados: 42
Autores: Moschetto,Fernanda Augusto; Borges,Roberto Pereira; Duarte,Luis Felipe de Almeida.
Abstract  Globally, there is limited knowledge about management and conservation of Callianassidae family. Their catches seem to be recently increasing in several parts of the world and evidences raise concern on the need of specialized literature focused on populations monitoring. At Southeast of Brazil, the species Callichirus major (Say 1818), known as the ghost shrimp, is frequently captured for use as bait in sport fishing and, according to previous studies, the overexploitation could threaten the population. The aim of this study was evaluated over a year this harmful human pressure on the species C. major in two beaches contiguous but susceptible to different anthropogenic impacts due to the existence of legislation on one beach that prohibits the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callianassidae; Ghost shrimp; Conservation; Overexploitation; Sandy beaches; Crustacean.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100701

Use of intertidal areas by shrimps (Decapoda) in a brazilian Amazon estuary
Provedor de dados: 42
Autores: SAMPAIO,HEBERT A.; MARTINELLI-LEMOS,JUSSARA M.
The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops) in an Amazon estuary. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature) and measured the area (m2) and volume (m3) of every pool through bathymetry. The average pH, salinity, temperature, area and volume of tide pools were 8.75 (± 0.8 standard deviation), 35.45 (± 3), 29.49 °C (± 2.32), 27.41 m2 (± 41.18), and 5.19 m3(± 8.01), respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Habitat; Density; Biomass; Decapoda.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100333

Genome engineering via homologous recombination in mouse embryonic stem (ES) cells: an amazingly versatile tool for the study of mammalian biology
Provedor de dados: 42
Autores: BABINET,CHARLES; COHEN-TANNOUDJI,MICHEL.
The ability to introduce genetic modifications in the germ line of complex organisms has been a long-standing goal of those who study developmental biology. In this regard, the mouse, a favorite model for the study of the mammals, is unique: indeed not only is it possible since the late seventies, to add genes to the mouse genome like in several other complex organisms but also to perform gene replacement and modification. This has been made possible via two technological breakthroughs: 1) the isolation and culture of embryonic stem cells (ES), which have the unique ability to colonize all the tissues of an host embryo including its germ line; 2) the development of methods allowing homologous recombination between an incoming DNA and its cognate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryonic stem cells (ES); Genome; Gene ''targeting''; Knock-out mice; Conditional mutations.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300007

Games Applied to Children with Motor Impairment using the Myo Wearable Device
Provedor de dados: 42
Autores: Fernandes,Flávia Gonçalves; Cardoso,Alexandre; Lopes,Renato de Aquino.
Abstract  The characteristic of immersion, involvement and motivation have made serious games an important tool to be used in the medical field. However, there are people that, having some sort of physical disability, are not able to, or do not feel motivated to play. This work presents a strategy to support human- computer interactions for children with a disability in their upper limbs through a wearable device, with the objective of improving access to digital games for the target audience. For the development of this work, the wearable device Myo was used to control a puzzle game as a means of providing the interaction between the individual and the game. In this context, the game is controlled with the movement of the user's upper limb that presents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physical disability; Wearables; Digital games; Upper limbs.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100902

Daily life of women with alcoholic companions and the provided care
Provedor de dados: 42
Autores: NASCIMENTO,VAGNER F. DO; LIMA,CLÁUDIA A.S.; HATTORI,THALISE Y.; TERÇAS,ANA CLÁUDIA P.; LEMES,ALISSÉIA G.; LUIS,MARGARITA A.V.
Abstract: The study aimed to know the daily life of women with alcoholic companions and the provided care. This is a comprehensive-interpretative, qualitative study, guided by the thematic Oral History method. Data collection occurred by semistructured interview. The empirical material was subjected to content analysis under the light of the King’s Theory of Goal Attainment. Women are frustrated and frightened by the alcoholic companion’s behavior and lifestyle, and still feel judged by society. Many abandon their life projects and self-care due to the overload caused by the companion’s absence in the care of home and children. The family care they develop focuses on maintaining the family and protecting from further damage. The study revealed that these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alcoholism; Caregivers; Family relations; Primary health care.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100804

Two new species and updated checklist of Oxyethira Eaton, 1873 (Trichoptera, Hydroptilidae) from Brazil
Provedor de dados: 42
Autores: ROCHA,ISABELA C.; DUMAS,LEANDRO L.; SOUZA,WAGNER R.M.
ABSTRACT Two new species of Oxyethira Eaton, 1873 are described: Oxyethira cascadanta sp. n. and Oxyethira quadrilobata sp. n. Description and illustrations of the new species are provided based on specimens collected in Parque Nacional da Serra da Canastra, Minas Gerais State, Southeast Brazil. Both species are assigned to the subgenus Loxotrichia but differ from other species mainly in morphology of the subgenital plate, subgenital processes and inferior appendages. Additionally, we provide an updated checklist of the Oxyethira species from Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insects; Canastra mountain range; Hydroptilinae; Species list; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100147

A new ctenochasmatid pterosaur from the Lower Cretaceous, western Liaoning, China
Provedor de dados: 42
Autores: Jiang,Shunxing; Wang,Xiaolin.
A nearly complete skull of a new ctenochasmatid pterosaur, Pterofiltus qiui gen. et sp. nov., from the Lower Cretaceous deposits of Liaoning, China, is described here. The specimen (IVPP V12339), was collected from the shale of the lower Yixian Formation (125 Ma) at the Zhangjiagou locality. It has the following combination of characters: about 112 teeth in total (including the upper and lower jaws); the dentition occupies more than 50% of the skull length; the anterior teeth vary in size; the mandibular symphysis is longer than half of the whole mandible length; in ventral view, an apparent symphyseal trough in the median part of the symphysis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lower Cretaceous; Yixian Formation; Pterofiltus qiui; Ctenochasmatidae; Liaoning; China.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400011

Lychee (Litchi chinensis Sonn.) peel flour: effects on hepatoprotection and dyslipidemia induced by a hypercholesterolemic diet
Provedor de dados: 42
Autores: QUEIROZ,ESTELA R.; ABREU,CELESTE M.P. DE; ROCHA,DENISE A.; SOUSA,RAIMUNDO V. DE; FRÁGUAS,RODRIGO M.; BRAGA,MARIANA A.; CÉSAR,PEDRO H.S.
ABSTRACT Dyslipidemias are associated with the incidence of cardiovascular diseases, obesity, diabetes, hypertension and hepatic steatosis, being the cause of morbidity and mortality. This study investigated the effects of lychee peel flour (PF) on serum levels of total cholesterol (TC), low-density lipoprotein (LDL-c), triacylglycerols (TAG) and various parameters related to obesity, in rats fed a hypercholesterolemic diet. Therefore, 20 male rats were used. In the first 21 days, the animals were fed a hypercholesterolemic diet, except for control group. In the following 21 days, their diets were modified, and they received a standard diet (Control); hypercholesterolemic (Hyper); hypercholesterolemic + 5% PF (PF5) and hypercholesterolemic + 10% PF (PF10)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cholesterol; Lipid peroxidation; Steatosis; Triacylglycerol; Weight gain.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100267

Sampling system for estimating woody debris in an urban mixed tropical forest
Provedor de dados: 42
Autores: PÉLLICO NETTO,SYLVIO; PELISSARI,ALLAN L.; BRIBEIRO,ANDRESSA; MACHADO,SEBASTIÃO A.; NASCIMENTO,RODRIGO G.M.
Abstract Woody debris, defined as standing and downed deadwood, consists in an essential component of the forest carbon stock. However, few studies have been carried out to get an efficient and accurate sampling procedure for estimating it. This work proposes two methodologies to estimate the woody debris volume in a Brazilian mixed tropical forest: 1) two-stage systematic sampling, using a mixed methodology, in which the Strand’s method is applied to standing dead trees and stumps, and line intercept sampling is used to fallen trees and branches; and 2) ratio estimate of the sum of cross-sectional areas of deadwood pieces and forest basal area, aiming to obtain the total woody debris volume indirectly in the natural forest. Conversions for biomass and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Line intercept sampling; Ratio estimate; Systematic sampling; Strand’s method.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703769

Position-dependent correlation between TBX22 exon 5 methylation and palatal shelf fusion in the development of cleft palate
Provedor de dados: 42
Autores: LI,KE; SHU,XUAN; GONG,HUI; CHENG,LIUHANGHANG; DONG,ZEJUN; SHU,SHENYOU.
Abstract: DNA methylation is essential for spatiotemporally-regulated gene expression in embryonic development. TBX22 (Chr X: 107667964-107688978) functioning as a transcriptional repressor affects DNA binding, sumoylation, and transcriptional repression associated with X-linked cleft palate. This study aimed to explore the relationship and potential mechanism between TBX22 exon 5 methylation and palatal shelf fusion ﻿induced by all-trans retinoic acid (ATRA). ﻿We performed DNA methylation profiling, using MethylRAD-seq, after high throughput sequencing of mouse embryos from control (n=9) and ATRA-treated (to induce cleft palate, n=9) C57BL/6J mice at embryonic gestation days(E) 13.5, 14.5 and 16.5. ﻿TBX22 exon 5 was hyper-methylated﻿ at the CpG site at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA methylation; Cleft palate; TBX22; CpG site.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300711

Abundance and instantaneous transport of Petrolisthes armatus (Gibbes, 1850) planktonic larvae in the Catuama inlet, Northeast Brazil
Provedor de dados: 42
Autores: Melo Júnior,Mauro de; Schwamborn,Ralf; Neumann-Leitão,Sigrid; Paranaguá,Maryse N.
The influence of tidal and diel changes on the exchange of Petrolisthes armatus planktonic larvae was studied at the Catuama inlet, which represents an intermediate system of marine and estuarine environments in the Northeast Brazil. To characterize the larval abundance and vertical distribution, samplings were carried out in August 2001 at neap tide and 3 stations, with 3 hours interval over 24 hours. Samples were taken at three or two depths at each station, with a plankton pump coupled to a 300 µm mesh size net. Petrolisthes armatus zoea I and II showed a mean of 26.3 ± 83.6 and 12 ± 38.8 ind m-3, respectively. During flood tides, the larvae were more concentrated in the midwater and surface, which avoided the transport to internal regions. In contrast,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeast Brazil; Decapod larvae; Petrolisthes armatus; Estuarine inlet; Transport; Zooplankton.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100009

Inhibitory effects on the production of inflammatory mediators and reactive oxygen species by Mori folium in lipopolysaccharide-stimulated macrophages and zebrafish
Provedor de dados: 42
Autores: KWON,DA HYE; JEONG,JIN WOO; CHOI,EUN OK; LEE,HYE WON; LEE,KI WON; KIM,KI YOUNG; KIM,SUNG GOO; HONG,SU HYUN; KIM,GI-YOUNG; PARK,CHEOL; HWANG,HYE-JIN; SON,CHANG-GUE; CHOI,YUNG HYUN.
ABSTRACT Mori folium, the leaf of Morus alba L. (Moraceae), has been traditionally used for various medicinal purposes from ancient times to the present. In this study, we examined the effects of water extract of Mori folium (WEMF) on the production of inflammatory mediators, such as nitric oxide (NO) and prostaglandin E2 (PGE2), and reactive oxygen species (ROS) in lipopolysaccharide (LPS)-stimulated murine RAW 264.7 macrophages. Our data indicated that WEMF significantly suppressed the secretion of NO and PGE2 in RAW 264.7 macrophages without any significant cytotoxicity. The protective effects were accompanied by a marked reduction in their regulatory gene expression at the transcription level. WEMF attenuated LPS-induced intracellular ROS production in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mori folium; Inflammation; ROS; Macrophage; Zebrafish.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200661

The natural impact of banana inflorescences (Musa acuminata) on human nutrition
Provedor de dados: 42
Autores: Fingolo,Catharina E.; Braga,João M.A.; Vieira,Ana C.M.; Moura,Mirian R.L.; Kaplan,Maria Auxiliadora C.
Banana inflorescences are popularly known as 'navels,' and they are used in Brazil as nutritional complements. However, the nutritional value of banana inflorescences (male flowers and bracts) has never been studied. Therefore, plant material of Musa acuminata, cultivar "ouro", was collected in Rio de Janeiro state, Brazil, and then submitted to chemical procedures to determine its nutritional composition. The experiment was arranged a completely randomized design and performed in triplicate. The sample composition analysis showed percentual average value for moisture, protein, fat and ash as 8.21, 14.50, 4.04 and 14.43, respectively. The dehydrated inflorescences were found to contain a significant nutritive complement based on their high content of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomical analysis; Banana inflorescences; "banana-ouro"; Musa acuminata; Musaceae; Nutritional value.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400004

Karyotypic analysis in species of the genus Dasyprocta (Rodentia: Dasyproctidae) found in Brazilian Amazon
Provedor de dados: 42
Autores: RAMOS,ROSEMAR S. L.; VALE,WILLIAM G.; ASSIS,FÁTIMA L.
A total of 30 animals of the genus Dasyprocta were cytogenetically studied. They belong to the following species: D. prymnolopha (N=20), D. leporina (N=6), D. fuliginosa (N=1) and Dasyprocta sp. (N=3) (Dasyproctidae, Hystricognathi). Cell suspensions were obtained by peripheral blood culture, besides bone marrow and spleen cells, from D. prymnolopha and D. leporina. The diploid number was 64/65 for all samples. The karyotypes showed similarity, and chromosomal polymorphism was not detected by Giemsa conventional staining and G banding. The constitutive heterochromatin distribution at the pericentromeric region of all the chromosomes was similar in all species. D. prymnolopha, D. leporina and Dasyprocta sp. presented variation in the heterochromatical block...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; Hystricognathi; Dasyprocta; Karyotype.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100007

Eggshell and Histology Provide Insight on the Life History of a Pterosaur with Two Functional Ovaries
Provedor de dados: 42
Autores: WANG,XIAOLIN; KELLNER,ALEXANDER W. A.; CHENG,XIN; JIANG,SHUNXING; WANG,QIANG; SAYÃO,JULIANA M.; RODRIGUES,TAISSA; COSTA,FABIANA R.; LI,NING; MENG,XI; ZHOU,ZHONGHE.
The counterpart of a previously described non-pterodactyloid pterosaur with an egg revealed the presence of a second egg inside the body cavity of this gravid female. It clearly shows that pterosaurs had two functional oviducts and demonstrates that the reduction of one oviduct was not a prerequisite for developing powered flight, at least in this group. Compositional analysis of one egg suggests the lack of a hard external layer of calcium carbonate. Histological sections of one femur lack medullary bone and further demonstrate that this pterosaur reached reproductive maturity before skeletal maturity. This study shows that pterosaurs laid eggs even smaller than previously thought and had a reproductive strategy more similar to basal reptiles than to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Wukongopteridae; Reproductive Biology; Jurassic; China.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401599

Neurochemical phenotype and birthdating of specific cell populations in the chick retina
Provedor de dados: 42
Autores: calaza,Karin da Costa; Gardino,Patricia F.
The chick embryo is one of the most traditional models in developing neuroscience and its visual system has been one of the most exhaustively studied. The retina has been used as a model for studying the development of the nervous system. Here, we describe the morphological features that characterize each stage of the retina development and studies of the neurogenesis period of some specific neurochemical subpopulations of retinal cells by using a combination of immunohistochemistry and autoradiography of tritiated-thymidine. It could be concluded that the proliferation period of dopaminergic, GABAergic, cholinoceptive and GABAceptive cells does not follow a common rule of the neurogenesis. In addition, some specific neurochemical cell groups can have a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Developing; Neurogenesis; Neurotransmitter systems; Ontogenesis; Proliferation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300007

The effects of Cyclosporin A and Heteropterys tomentosaon the rat liver
Provedor de dados: 42
Autores: Freitas,Karine M. de; Almeida,Jacqueline M.; Monteiro,Juliana C.; Diamante,Maria Aparecida S.; Vale,Jéssica S.F. do; Camargo,Camila; Jorge,Marçal H.A.; Dolder,Heidi.
Cyclosporin A (CsA) is a widely employed immunosuppressive drug that is associated with several side effects, among then hepatotoxicity. Heteropterys tomentosais a Brazilian plant efficient in reducing damage caused by CsA on the rat testis and prostate. The aim of this study was to evaluate the effect of CsA and H. tomentosa(administered isolated or simultaneously) on the liver of Wistar rats. The animals were treated daily with water (control), CsA (15mg/kg/day), H. tomentosainfusion or CsA+H. tomentosa, for 21 or 56 days. The treatments did not alter liver morphology or cause fibrosis. H. tomentosaadministered for 21 days increased the number of hepatocyte nuclei and Kupffer cell volumetric proportion. After 56 days of treatment, H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatotoxicity; Heteropterys aphrodisiaca; Medicinal plant; Phytotherapy; Hepatotoxicidade; Heteropterys aphro disiaca; Planta medicinal; Fitoterapia.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100369

The T-cell anergy induced by Leishmania amazonensis antigens is related with defective antigen presentation and apoptosis
Provedor de dados: 42
Autores: Pinheiro,Roberta O.; Pinto,Eduardo F.; Benedito,Alessandra B.; Lopes,Ulisses G.; Rossi-Bergmann,Bartira.
Leishmania amazonensis is the main agent of diffuse cutaneous leishmaniasis, a disease associated with anergic immune responses. In this study we show that the crude antigen of Leishmania amazonensis (LaAg) but not L. braziliensis promastigotes (LbAg) contains substances that suppress mitogenic and spontaneous proliferative responses of T cells. The suppressive substances in LaAg are thermoresistant (100ºC/1h) and partially dependent on protease activity. T cell anergy was not due to a decreased production of growth factors as it was not reverted by addition of exogenous IL-2, IL-4, IFN-gamma or IL-12. LaAg did not inhibit anti-CD3-induced T cell activation, suggesting that anergy was due to a defect in antigen presentation. It was also not due to cell...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leishmania; Anergy; Apoptosis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300006

Anthelmintic acetogenin from Annona squamosa L. Seeds
Provedor de dados: 42
Autores: Souza,Marta M.C.; Bevilaqua,Claudia M.L.; Morais,Selene M.; Costa,Cícero T.C.; Silva,Ana R.A.; Braz-Filho,Raimundo.
Annona squamosa seeds extracts showed anthelmintic activity against Haemonchus contortus, the main nematode of sheep and goat in Northeastern Brazil. A compound 1 was isolated from ethyl acetate extract and inhibited the egg hatching of H. contortus at 25 mg ml-1. The structure of 1 was determined as a C37 trihydroxy adjacent bistetrahydrofuran acetogenin based on spectroscopic analysis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Haemonchus contortus; Nematodes; Annonacea; Phytotherapy.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200005

Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
Provedor de dados: 42
Autores: NOGUEIRA,AFONSO C. R.; SARGES,ROSEANE R.
The waterfalls of the Presidente Figueiredo municipality represent a fascinating natural scenery of northeast state of Amazonas, northern Brazil. The falls, generally less than 10m high, are developed on siliciclastic rocks of the Nhamundá (Lower Silurian), and Manacapuru (Upper Silurian - Lower Devonian) formations. Morphological and structural analyses of these features indicate that most of them originated through Quaternary neotectonics and are installed in NE-trending normal fault escarpments. Waterfalls also developed within pseudokarstic features, but are less frequent. The origin of the Presidente Figueiredo waterfalls probably goes back to the Neogene, when the region was submitted to laterization processes associated with a humid climate and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waterfalls; Western Amazon; Quaternary tectonics; Pseudokarst.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200012

Reassessment and Relationships of †Scutatuspinosus itapagipensis (Teleostei, Clupeomorpha, †Ellimmichthyiformes) from the Neocomian of Recôncavo Basin, Northeastern Brazil
Provedor de dados: 42
Autores: FIGUEIREDO,FRANCISCO J. DE; RIBEIRO,DOUGLAS R.M.
ABSTRACT Clupeomorphs are found in many assemblages of the northeastern Brazil, whose ages range from the Neocomian to Paleogene. Ten species were described. Among them †Scutatuspinosus itapagipensis, a torpedo-like fish found in shales of the Marfim Formation from Bahia, remains poorly known. At first it was positioned within †Scutatuspinosinae and indicated as closely related to †Diplomystus. Diagnoses for the subfamily and genus were based on certain characters masking relationships. Recently it was placed in †Ellimmichthyiformes, but its systematic position remains controversial. We furnish additional data and restorations together with a parsimony analysis with TNT program, using 60 unordered and unweighted characters from selected species of 13...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: †Scutatuspinosus itapagipensis; Osteology; Systematics; Recôncavo Basin; Lower Cretaceous.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300799

Development of EPIC-PCR Markers for Lutjanus purpureus (Lutjanidae-Perciformes) and their Potential Applicability in Population Analyses
Provedor de dados: 42
Autores: SILVA,RAIMUNDO DA; SILVA,DANILLO; VENEZA,IVANA; SAMPAIO,IRACILDA; SCHNEIDER,HORACIO; GOMES,GRAZIELLE.
ABSTRACT In the present study, a novel set of eight EPIC primers were developed for Lutjanus purpureus and assayed in five other marine teleosts including three lutjanids, one scianid and one anablepid. Most of the genomic regions used in this study presented genetic diversity indexes equal or greater than the intragenic regions commonly used in population genetics studies. Moreover, six out of eight markers showed cross-amplification with other taxa. Thus, the primers described here may be used to elucidate questions at the intraspecific level for a large number of taxa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EPIC-PCR; Intron; Lutjanus; Southern Red Snapper.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502095

Evaluation of space adequateness of shrimp farms in Southern Brazil
Provedor de dados: 42
Autores: Freitas,Rodrigo R.; Hartmann,Carlos; Tagliani,Paulo R. A.; Poersch,Luís H.
In Rio Grande do Sul State, there are four marine shrimp (Litopenaeus vannamei) farms in the municipal districts of São José do Norte and Rio Grande, and other four with previous license for operation. Thus, the present study aimed to identify and characterize areas for marine shrimp farming located in the Southern portion of the Patos Lagoon estuary (32º00'S 52º00'W) by employing the analysis of satellite remote sensing (Landsat TM and ETM+/Google Earth), airborne remote sensing (35mm system ADAR 1000), terrestrial remote sensing (RICOH 500SE), and field expeditions, integrating data in a Geographical Information System (IDRISI Andes). As a result, the enterprises were built on coastal fields or in obliterated dune areas, which are favorable for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Costal management; GIS; Patos Lagoon; Shrimp farms.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300025

Influence of Palythoa caribaeorum (Anthozoa, Cnidaria) zonation on site-attached reef fishes
Provedor de dados: 42
Autores: Mendonça-Neto,José P.; Ferreira,Carlos E.L.; Chaves,Laís C.T.; Pereira,Renato C.
This work aimed to test the influence of Palythoa caribeorum, a widely distributed zoanthid in the Atlantic, on site-attached reef fish in a subtropical rocky shore. Density, richness and vertical distribution of reef fish inside (ID) and outside (OD) previously chosen P. caribaeorum dominance patches were compared through stationary visual censuses along three different periods. Fishes were grouped in different trophic guilds to evidence differences in resources uses in both treatments. A complexity index was estimated by the chain link method and percentage covering of benthic organisms was obtained analyzing random points from replicated photo-quadrats. We observed thirty-eight species of fishes, belonging to twenty-five families. Reef fish communities...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic covering; Habitat complexity; Reef fish community; Rocky shore; Zoanthid.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300010

Extremum Seeking-based Adaptive PID Control applied to Neuromuscular Electrical Stimulation
Provedor de dados: 42
Autores: ROUX-OLIVEIRA,TIAGO; COSTA,LUIZ R.; PINO,ALEXANDRE V.; PAZ,PAULO.
Abstract A multivariable deterministic extremum seeking (ES) is being evaluated to construct an adaptive Proportional-Integral-Derivative (PID) control law for the functional Neuromuscular Electrical Stimulation (NMES) of stroke patients. The developed scheme is applied to control the position of the patient’s arm so that movements of flexion/extension for its elbow can be produced. The true limitations of a PID controller for these types of applications is that a PID controller is designed for linear systems, but the system which is being controlled is nonlinear. Moreover, it is worth mention that clinicians’ knowledge of control systems is limited. Therefore, their expertise in tuning controllers is limited. Also, in NMES applications each patient is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NMES; Stroke patients; Adaptive systems; Deterministic extremum seeking; PID control; Trajectory tracking.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200901

Blood compatibility assessments of electrospun polyurethane nanocomposites blended with megni oil for tissue engineering applications
Provedor de dados: 42
Autores: JAGANATHAN,SARAVANA KUMAR; MANI,MOHAN P.; SUPRIYANTO,EKO.
Abstract: Tissue engineering holds as a prominent technique to repair or replace the damaged human parts to recreate its native function. In this research, a novel scaffold based on polyurethane (PU) comprising megni oil was electrospun for tissue engineering applications. The obtained polyurethane blended with megni oil nanofibers were characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), contact angle measurement and atomic force microscopy (AFM). Furthermore, the blood compatibility of the fabricated nanocomposites evaluated through activated prothrombin time (APTT), partial thromboplastin time (PT) and hemolysis assay to determine the anticoagulant nature. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Megni oil; Electrospun scaffold; Blood compatibility; Tissue engineering.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300708

Scientific findings of Alexander von Humboldt's expedition into the Spanish-American Tropics (1799-1804) from a geographical point of view
Provedor de dados: 42
Autores: Kohlhepp,Gerd.
Alexander von Humboldt's expedition from 1799 till 1804 to the "equinoctial regions of the new world" led through Venezuela, Cuba, Colombia, Ecuador, Peru, and Mexico. In Europe an increased knowledge of the "New World" was connected with the privately funded journey, which served purely scientific purposes and had nothing to do with the exploration and exploitation of natural resources. Besides the research results, which were based on new measuring methods and the quantitative ascertainment of scientific basics, the journey also made possible detailed descriptions in matters of regional studies including social, socio-economic, political, and economic-geographic circumstances, which were based on empirical field studies. The expedition took place shortly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Historical geography; Regional studies; Latin America; Spanish colonies; Alexander von Humboldt.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200010

Tectonic control on the stratigraphic framework of Late Pleistocene and Holocene deposits in Marajó Island, State of Pará, eastern Amazonia
Provedor de dados: 42
Autores: Rossetti,Dilce F.
The traditional view that the Brazilian Amazonia is located in a tectonically stable area since the Cretaceous is changing in front of the increasing documentation of fault reactivations even during the Holocene. How the sedimentary record has responded to these events is an issue that remains to be approached with basis on field data. This work focuses on the stratigraphic correlation of late Quaternary deposits from eastern Marajó Island, with the goal of demonstrating the role of fault reactivation on the origin and preservation of these deposits. Despite the location in a stable platform of a continental passive margin, three studied stratigraphic units display significant vertical offsets that define two depocenters that are better explained through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Tectonics; Quaternary; Stratigraphic framework; Radiocarbon dating; Sedimentation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200020

Neuroprotective effect of Portulaca oleracea extracts against 6-hydroxydopamine-induced lesion of dopaminergic neurons
Provedor de dados: 42
Autores: MARTINS,WALESKA B.; RODRIGUES,SHEYLA A.; SILVA,HATAMY K.; DANTAS,CAMILA G.; JÚNIOR,WALDECY DE LUCCA; FILHO,LAURO XAVIER; CARDOSO,JULIANA C.; GOMES,MARGARETE Z.
ABSTRACT The Portulaca oleracea L. (Portulacaceae) is a cosmopolitan species with a wide range of biological activities, including antioxidant and neuroprotective actions. We investigated the effects of P. oleracea extracts in a 6-hydroxydopamine rat model of Parkinson's disease, a debilitating disorder without effective treatments. Chemical profiles of aqueous and ethanolic extracts of whole plant were analyzed by thin layer chromatography and the antioxidant activity was assessed by 2,2-diphenyl-1-picrilhidrazila method. Male Wistar rats received intrastriatal 6-hydroxydopamine and were treated with vehicle or extracts (oral, 200 and 400 mg/kg) daily for two weeks. The behavioral open field test was conducted at days 1 and 15. Immunohistochemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parkinson Disease; Antioxidant Response Elements; Levodopa; Purslane.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401439

Global climate change and dengue
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200001

Influence of substrate on the richness and composition of Neotropical cave fauna
Provedor de dados: 42
Autores: ZEPON,TAMIRES; BICHUETTE,MARIA ELINA.
ABSTRACT The food base in the subterranean environment consists mainly of allochthonous materials. In this environment the resources are distributed generally in a heterogeneous dispersed way and the distribution of resources and their availability determine where the terrestrial invertebrates will reside, which is important for understanding ecological relationships and to establish conservation strategies. Thus, we tested how the complexity of substrates influences the richness and composition of the subterranean terrestrial invertebrates in the Presidente Olegário karst area, southeastern Brazil. We carried out collections in six caves during both dry and wet seasons, using combined collection methods. We observed different distributions in relation to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Communities; Conservation; Food web; Terrestrial invertebrates; Trophic resources.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401615

Gene homozygosis and mitotic recombination induced by camptothecin and irinotecan in Aspergillus nidulans diploid cells
Provedor de dados: 42
Autores: ESQUISSATO,GIOVANA N.M.; SANT'ANNA,JULIANE R. DE; FRANCO,CLAUDINÉIA C.S.; ROSADA,LÚCIA J.; SANTOS,PAULA A.S.R. DOS; CASTRO-PRADO,MARIALBA A.A. DE.
Mitotic recombination is a process involved in carcinogenesis which can lead to genetic loss through the loss of heterozygosity. The recombinogenic potentials of two anticancer drugs topoisomerase I inhibitors, camptothecin (CPT) and irinotecan (CPT-11), were evaluated in the present study. The homozygotization assay, which assess the induction of mitotic recombination and gene homozygosis, as well as the heterozygous A757//UT448 diploid strain of Aspergillus nidulanswere employed. The three non-cytotoxic concentrations of CPT (3.5 ng mL−1, 10.5 ng mL−1 and 17.4 ng mL−1) were found to induce both mitotic recombination and gene homozygosis. CPT treatment produced three diploids homozygous, for nutritional and conidia color genes, and Homozygotization...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anticancer drugs; Homozygotization assay; Homologous recombination; Secondary malignancies.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401703

Reproduction of a whiptail lizard (Ameivula ocellifera, Teiidae) from a coastal area in northeastern Brazil
Provedor de dados: 42
Autores: ZANCHI-SILVA,DJAN; BORGES-NOJOSA,DIVA M.; GALDINO,CONRADO A.B.
The reproductive ecology of Ameivula ocellifera was studied from September 2009 to August 2010 in a coastal area of the state of Ceará, Brazil. Females reproduced continuously throughout the year, with a peak at the end of the rainy season. Even though there was a predominance of pre-reproductive individuals in the sample, gonadal activity of males peaked synchronously to female reproduction. Mean clutch size was 1.98 ± 0.56 and positively associated with female body size, while mean egg volume was 510.54 ± 84.29 mm3 and unrelated to female body size. We did not find any association between clutch size and average egg volume.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ameivula; Cnemidophorus; Life history; Reproductive cycle.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301263

Phosphate solubilization by endophytic bacteria isolated from banana trees
Provedor de dados: 42
Autores: MATOS,AMANDA D.M.; GOMES,IZABELA C.P.; NIETSCHE,SILVIA; XAVIER,ADELICA A.; GOMES,WELLINGTON S.; DOS SANTOS NETO,JOSÉ A.; PEREIRA,MARLON C.T.
ABSTRACT Forty isolates of endophytic bacteria isolated from banana tree roots were assessed as to their capacity to solubilize phosphate in a solid culture medium supplemented with different inorganic and one organic source of phosphorus. The amount of phosphorus (P) in each liquid medium was quantified, and an indirect assessment of acid phosphatase activity was performed. All assays had a fully randomized design, with three repetitions. Approximately 67.5% of the 40 isolates assessed in solid medium solubilized phosphorus from tricalcium phosphate and 7.5% of the isolates solubilized phosphorus from soy lecithin; no isolates exhibited P solubilization capacity in medium supplemented with iron phosphate. Acid phosphatase activity was detected in 65% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid phosphatase; Bacillus sp.; Lecithin; Musa spp.; PGPB.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602945

Effect of resin content and pressing temperature on banana pseudo-stem particle boards properties using full factorial design
Provedor de dados: 42
Autores: BARRAGÀN-LUCAS,ANA D.; LLERENA-MIRANDA,CRISTHIAN; QUIJANO-AVILÉS,MARIA FERNANDA; CHÓEZ-GUARANDA,IVÁN A; MALDONADO-GUERRERO,LINDA C.; MANZANO-SANTANA,PATRICIA I.
Abstract: The volume of global gross banana exports reached a record of 117.9 million tonnes in 2015 (FAO 2017), which agro-industrial wastes derived as the pseudo-stem, rachis and leaves do not have an industrial application instead they are discarded. This research study applies full factorial design and response surface methodology to determine the effect of pressing temperature and resin content on density (D), moisture (M), water absorption (WA), water swelling (WS), module of rupture (MOR), module of elasticity (MOE) and formaldehyde content (FC) of particle board made of banana pseudo-stem. A 22 factorial design was performed, factors considered were resin and temperature. The low level of resin was 15% in the coarse fiber (CF) and 35% in fine fiber...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fiber board; Musa paradisiaca; Optimization; Pseudo-stem; Waste.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700903

Evaluation of genotoxic and cytotoxic effects of hydroalcoholic extract of Euphorbia tirucalli (Euphorbiaceae) in cell cultures of human leukocytes
Provedor de dados: 42
Autores: Machado,Michel M.; Oliveira,Luis F.S. de; Zuravski,Luisa; Souza,Raul O. de; Fischer,Paula; Duarte,Jonathaline A.; Rocha,Manoelly O.; Güez,Camila M.; Boligon,Aline A.; Athayde,Margareth L.
ABSTRACT Euphorbia tirucalli (L.), commonly known as aveloz, has been indiscriminately used in popular medicine to treat various illnesses. However, some components can have devastating consequences. Injury to a cell's genetic material can cause mutations, cancer, and cell death. Our main goal in this work was to evaluate the genotoxic and cytotoxic effects of E. tirucalli extract on human leukocytes. For this purpose, we performed a phytochemical analysis to evaluate the plant's components. In the second step, we treated cultured human leukocytes with different concentrations of the dry extract of the plant and then evaluated the oxidative and genotoxic profiles of these leukocytes. We found that at 1% and 10% concentrations, the aveloz extract acted as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aveloz; Euphorbia tirucalli; Leukocytes; Genotoxic; Cytotoxic.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100017

Physicochemical characteristics and sensory profile of honey samples from stingless bees (Apidae: Meliponinae) submitted to a dehumidification process
Provedor de dados: 42
Autores: Carvalho,Carlos A.L.; Sodré,Geni S.; Fonseca,Antonio A.O.; Alves,Rogério M.O.; Souza,Bruno A.; Clarton,Lana.
This study was conducted to evaluate the effect of a dehumidification process on the physicochemical and sensory characteristics of stingless-bee honey. Melipona scutellaris and M. quadrifasciata honey samples were submitted to a dehumidification process and to physicochemical (reducing sugars, apparent sucrose, moisture, diastatic activity, hydroxymethylfurfural, ash, pH, acidity, and electric conductivity) and sensory evaluations (fluidity, color, aroma, crystallization,flavor,and acceptability). The results indicated that the dehumidification process does not interfere with honey quality and acceptability.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Honey conservation; Meliponids; Honey quality; Moisture.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100015

Choline acetyltransferase detection in normal and denervated electrocyte from Electrophorus electricus (L.) using a Confocal Scanning Optical Microscopy Analysis
Provedor de dados: 42
Autores: NUNES-TAVARES,NILSON; CUNHA-E-SILVA,NARCISA LEAL; HASSÓN-VOLOCH,AÍDA.
Acetylcholine is the neurotransmitter responsible for the transmission of impulses from cholinergic neurons to cells of innervated tissues. Its biosynthesis is catalyzed by the enzyme Choline acetyltransferase that is considered to be a phenotypically specific marker for cholinergic system. It is well known that the regulation of Choline acetyltransferase activity under physiological and pathological conditions is important for development and neuronal activities of cholinergic functions. We observed the distribution of Choline acetyltransferase in sections from the normal and denervated main electric organ sections of Electrophorus electricus (L.) by immunofluorescence using a anti-Choline acetyltransferase antibody. The animals were submitted to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Choline acetyltransferase; Electrocyte; Denervation; Immunohistochemistry.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300007

Antidiarrheal activity of extracts from Maytenus gonoclada and inhibition of Dengue virus by lupeol
Provedor de dados: 42
Autores: SILVA,FERNANDO C.; RODRIGUES,VANESSA G.; DUARTE,LUCIENIR P.; LULA,IVANA S.; SINISTERRA,RUBEN D.; VIEIRA-FILHO,SIDNEY A.; RODRIGUES,RODRIGO A.L.; KROON,ERNA G.; OLIVEIRA,PATRÍCIA L.; FARIAS,LUIZ M.; MAGALHÃES,PAULA P.; SILVA,GRÁCIA D.F.
ABSTRACT Diarrhea is an infectious disease caused by bacterial, virus, or protozoan, and dengue is caused by virus, included among the neglected diseases in several underdeveloped and developing countries, with an urgent demand for new drugs. Considering the antidiarrheal potential of species of Maytenus genus, a phytochemical investigation followed by antibacterial activity test with extracts of branches and heartwood and bark of roots from Maytenus gonoclada were conducted. Moreover, due the frequency of isolation of lupeol from Maytenus genus the antiviral activity against Dengue virus and cytotoxicity of lupeol and its complex with β-cyclodextrins were also tested. The results indicated the bioactivity of ethyl acetate extract from branches and ethanol...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antidiarrheal; Celastraceae; Pentacyclic Triterpene; Antiviral Activity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401555

Hydrodynamic Aspects at Vitória Bay Mouth, ES
Provedor de dados: 42
Autores: GARONCE,FLÁVIA A.A.; QUARESMA,VALÉRIA S.
Understading the hydrodynamic behavior and suspended particulated matter (SPM) transport are of great importance in port regions such as Vitória Harbor, which is located at Vitória Bay, Vitória – ES, Brazil. Vitória Bay is an estuary that has not been systematically assessed through a temporal analysis in order to identify its hydrodynamics characteristics and SPM exchange. This study aims to investigate salt and suspended particulate matter flux at the estuarine mouth of Vitória Bay by understanding the temporal variation of salinity, temperature and tidal currents within the water column and at the channel crosssection. Results showed that the estuarine mouth tended to present partial stratification periods during neap tides and little stratification in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Hydrodynamics; Suspended particulate matter; Vitória Bay.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200555

Landslide hazard mapping, DNA damage induced by sucrose and the biotechnology potential of sponge-associated bacteria communities
Provedor de dados: 42
Autores: BONATTO,DIEGO.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602545

Closed form expressions for moments of the beta Weibull distribution
Provedor de dados: 42
Autores: Cordeiro,Gauss M; Simas,Alexandre B; Stošic,Borko D.
The beta Weibull distribution was first introduced by Famoye et al. (2005) and studied by these authors and Lee et al. (2007). However, they do not give explicit expressions for the moments. In this article, we derive explicit closed form expressions for the moments of this distribution, which generalize results available in the literature for some sub-models. We also obtain expansions for the cumulative distribution function and Rényi entropy. Further, we discuss maximum likelihood estimation and provide formulae for the elements of the expected information matrix. We also demonstrate the usefulness of this distribution on a real data set.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta Weibull distribution; Expected information matrix; Maximum likelihood; Moment; Weibull distribution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200002

Morphology of the Ibiraqüera dunefield, SC
Provedor de dados: 42
Autores: MARTINHO,CAROLINE T.; GIANNINI,PAULO C.F.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300026

New iodine derivatives of flavonol and isoflavone
Provedor de dados: 42
Autores: Carvalho,Mário G. de; Silva,Virginia C. da; Silva,Tânia M.S. da; Camara,Celso A.; Braz-Filho,Raimundo.
The reaction of the flavonol 3,7,3', 4'-tetra-O-methylquercetin (1) and of the isoflavone 7,4'-di-O-methylgenistein (2) with alkaline iodine in methanol afforded four new iodine derivatives: 8-iodo-5-hydroxy-3,7,3', 4'-tetramethoxy- flavone (1a) and 6-iodo-5-hydroxy-3,7,3', 4'-tetramethoxyflavone (1b) from 1; 2 afforded a mixture of two compounds, identified as a racemic mixture of (±)-trans-5-hydroxy-2,3,7,4'-tetramethoxy-8-iodo-isoflavanone (2a) and (±)-trans-5-hydroxy-2,3,7,4'-tetramethoxy-6,8-diiodo-isoflavanone (2b). The formation of these different products reveals a significant difference involving the chemical interaction between the reactive site of α, β-unsaturated ketones of flavonol and isoflavone under the tested reaction conditions (using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flavonol; Isoflavone; Iodoflavonoid; Iodoisoflavonoid; Iodine derivatives.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100004

Sm-Nd age of the fazenda brasileiro gabbro, Bahia, Brazil: example of robust behavior of the Sm-Nd isotopic system under extreme hydrothermal alteration
Provedor de dados: 42
Autores: Pimentel,Márcio M.; Silva,Maria da Glória.
The Fazenda Brasileiro gold mineralization is hosted by a gabbroic sill, intrusive into metavolcanicmetasedimentary rocks of the Rio Itapicuru Greenstone Belt, São Francisco Craton. The 2.05 Ga old mineralization is associated with intense shearing and hydrothermal alteration, and the host gabbro is altered to a series of rocks rich in sericite, chlorite, actinolite, carbonate and quartz. Twelve whole-rock samples of the gold mineralization, representing varied degrees of alteration, from rocks with preserved igneous textures to the ore (quartz-carbonate-sulfide-chlorite), were studied by the Sm-Nd method. All analytical points resulted in an isochron (MSWD = 1.9) indicating the age of 2142 +/- 47 Ma (1s) and Epsilon Nd (T) of +1.2....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rio Itapicuru greenstone belt; Fazenda Brasileiro; Paleoproterozoic; Gold mineralization; Sm-Nd; Hydrothermal alteration.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300009

The positive moderating effect of absorptive capacity on R&amp;amp;D investment: the case of Argentina’s ict firms
Provedor de dados: 42
Autores: AGRAMUNT,LUIS FELIPE; BERBEL-PINEDA,JUAN M.
Abstract The model analyzes the positive moderating role of absorptive capacity (ACAP) in the innovative outcomes of the firms. It focuses on ACAP as a moderating variable of the innovative efforts that firms develop or have the chance of incorporating from outside and not just as an antecedent of the innovation results. The empirical evidence collected comes from a study conducted on 189 SMEs working in IT services in Argentina and the results prove the main hypothesis of how ACAP is a positive moderating factor of the innovative effort of firms, even in the case of the connections created by their the participation in international networks not having a high correlation. Some suggestions for policymaker managers and future lines of research are provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorptive capacity; Innovation; Internationalization; Networks; Innovative result.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603207

Comparative Effect of The Inclusion of Zootechnical Additives in the Feed of Japanese Quails in Two Productive Phases
Provedor de dados: 42
Autores: LEMOS,MARINA J.; CALIXTO,LÍGIA F.L.; SOUZA,DANIELE S.; REIS,TÚLIO L.; NASCIMENTO,APARECIDA A.; OLIVEIRA,CARLOS A.
Abstract This study aimed to evaluate the intestinal morphology, performance and financial analysis of the inclusion of additives in the feed during the productive period of 360 Japanese quails distributed in a completely randomized design in a split plot scheme in time with five treatments and eight repetitions of nine birds each. The treatments were: control, antibiotic, prebiotic, probiotic and synbiotic. The variables were: height, width and width/height ratio of the villi, crypt depth and villus/crypt ratio, feed intake, egg production, egg weight average, egg mass, feed conversion per mass and per dozen eggs and viability, internal rate of return, net present value and cost benefit. The additives in the feed increased height and width of the villi,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibiotic; Intestinal morphology; Prebiotic; Probiotic; Symbiotic.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703313

Controlled synthesis of noble metal nanomaterials: motivation, principles, and opportunities in nanocatalysis
Provedor de dados: 42
Autores: GEONMONOND,RAFAEL S.; SILVA,ANDERSON G.M. DA; CAMARGO,PEDRO H.C.
ABSTRACT This review describes some principles of the controlled synthesis of metal nanoparticles, focusing on how the fundamental understanding of their synthesis in the solution-phase can be put to tailor size, shape, composition, and architecture. The maneuvering over these parameters not only enable the tuning of properties, but also the maximization and optimization of performances for various applications. Herein, we start with a brief description of metallic nanoparticles, highlighting the motivation for achieving physicochemical control in their synthesis. After that, we turn our attention to some important definitions and classifications as well as their unique properties such as surface and quantum effects. Moreover, we discuss the strategies for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controlled synthesis; Noble-metals; Nanomaterials; Catalysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200719

Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil
Provedor de dados: 42
Autores: Góes,Ana M.; Rossetti,Dilce F.; Mendes,Anderson C.
Studies of heavy minerals in kaolin deposits from the Ipixuna Formation in the Rio Capim area (Northern Brazil) showed a mature to super mature assemblage dominated by zircon and tourmaline, and subordinately rutile, kyanite and staurolite. These minerals do not change much throughout the whole section; however, each kaolin unit displays a particular signature, defined by differences in the proportions of the whole assemblage of heavy minerals, as well as of their textural characteristics. This work revealed that the lower and upper kaolin units can be definitely considered as distinct depositional sequences. A higher proportion of opaque minerals and higher zircon values characterize the lower unit. The higher volumes of anhedric, rounded to sub-rounded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy minerals; Kaolin deposits; Ipixuna Formation; Early Cretaceous; Cametá Sub-Basin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300009

Reproductive morphology of female Guiana dolphins (Sotalia guianensis)
Provedor de dados: 42
Autores: BECEGATO,ESTELLA Z.; ANDRADE,JANAINA P.; GUIMARÃES,JULIANA P.; VERGARA-PARENTE,JOCIERY E.; MIGLINO,MARIA ANGELICA; SILVA,FERNANDA M. DE OLIVEIRA E.
The reproductive morphology of cetaceans is poorly studied and, despite the large number of strandings, reports on this subject are scarce due to access to carcasses mostly in an advanced state of decomposition. The present study aimed to describe histological characteristics of the female genital tract ofSotalia guianensis, in order to assist in future studies on the reproductive biology of these animals. Females of different ages, from stranding events on beaches in northeastern Brazil, were used. Fragments of all organs were collected and processed for light and scanning electron microscopy. Histological analyses showed that these structures were similar to those found in terrestrial mammals, with some peculiarities, such as the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Female genital system; Anatomy; Histology; Guiana dolphin.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401727

Neutrotoxic effects of fructose administration in rat brain: implications for fructosemia
Provedor de dados: 42
Autores: Macongonde,Ernesto A.; Costa,Naithan L.F.; Ferreira,Bruna K.; Biella,Mairis S.; Frederico,Marisa J.S.; Oliveira,Marcos R. de; Ávila Júnior,Silvio; Silva,Fátima R.M.B.; Ferreira,Gustavo C.; Streck,Emilio L.; Schuck,Patrícia F.
Fructose accumulates in tissue and body fluids of patients affected by hereditary fructose intolerance (HFI), a disorder caused by the deficiency of aldolase B. We investigated the effect of acute fructose administration on the biochemical profile and on the activities of the Krebs cycle enzymes in the cerebral cortex of young rats. Rats received a subcutaneous injection of NaCl (0.9 %; control group) or fructose solution (5 μmol/g; treated group). Twelve or 24 h after the administration, the animals were euthanized and the cerebral cortices were isolated. Peripheral blood (to obtain the serum) and cerebral spinal fluid (CSF) from the animals were also collected. It was observed that albumin levels were decreased and cholesterol levels were increased in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brain damage; Fructose; Fructosemia; Hereditary fructose intolerance; Krebs cycle; Metabolism.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301451

Scientometric indicators for Brazilian research on High Energy Physics, 1983-2013
Provedor de dados: 42
Autores: ALVAREZ,GONZALO R.; VANZ,SAMILE A.S.; BARBOSA,MARCIA C.
ABSTRACT This article presents an analysis of Brazilian research on High Energy Physics (HEP) indexed by Web of Science (WoS) from 1983 to 2013. Scientometric indicators for output, collaboration and impact were used to characterize the field under study. The results show that the Brazilian articles account for 3% of total HEP research worldwide and that the sharp rise in the scientific activity between 2009 and 2013 may have resulted from the consolidation of graduate programs, the increase of the funding and of the international collaboration as well as the implementation of the Rede Nacional de Física de Altas Energias (RENAFAE) in 2008. Our results also indicate that the collaboration patterns in terms of the authors, the institutions and the countries...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; High Energy Physics; Impact; Scientific collaboration; Scientific output; Scientometrics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502525

Last millennium environmental changes and climate inferences in the Southeastern Atlantic forest, Brazil
Provedor de dados: 42
Autores: Pessenda,Luiz C.R.; Saia,Soraya E.M.G.; Gouveia,Susy E.M.; Ledru,Marie-Pierre; Sifeddine,Abdelfettah; Amaral,Paula G.C.; Bendassolli,José A.
This study presents paleoenvironmental data based on pollen, elemental and isotopic compositions of organic matter (TOC, N, d13C and d15N) and 14C dating of 170 cm lake sediment record. Samplings have been made in Lagoa Grande at Parque Estadual Turístico do Alto Ribeira - PETAR, Southern São Paulo State, Southeastern Brazil. The variations in relative frequencies (in percentage) of arboreal pollen along the core range between 40 and 80%. The d13C values ranged from -23‰ to -30‰ and C/N of ~10 to 15, indicating the contribution of terrestrial C3 plants and algae in the sediment organic matter. The d15N results presented values from 3 to 4.5‰, also suggesting a mixture of algae and terrestrial C3 plants. The 14C dating indicates modern age for the shallow...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lacustrine sediment; C and N isotopes; Pollen; Atlantic Forest; Last millennium; Little Ice Age.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300019

Antioxidant effect of simvastatin throught oxidative imbalance caused by lisdexamfetamine dimesylate
Provedor de dados: 42
Autores: Eger,Guilherme A.; Ferreira,Vinícius V.; Batista,Camila R.; Bonde,Henrique; Lima,Daniela D. de; Wyse,Angela T.S.; Cruz,Júlia N. da; Rodrigues,André F.; Magro,Débora D. Dal; Cruz,José G.P. da.
The present study aims to directly investigate the behavioral and antioxidant effects of simvastatin in a model of bipolar mania induced by lisdexamfetamine dimesylate. Wistar rats were treated for 30 days with simvastatin. On the 24th day after the start of treatment, each rat was administered lisdexamfetamine dimesylate for 7 days. The results suggest that simvastatin combined with lisdexamfetamine dimesylate induced a significant increased locomotion and lisdexamfetamine dimesylate administration causes an oxidative imbalance determined by an increment in lipid peroxidation, protein oxidation and alterations in the activities of antioxidant enzymes in brain areas; moreover, in the presence of simvastatin, most of these effects were prevented. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphetamine; Lisdexamfetamine dimesylate; Oxidative stress; Simvastatin.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100335

Ultrasonic pretreatment of carrot slices: Effects of sonication source on drying kinetics and product quality
Provedor de dados: 42
Autores: YILMAZ,BURCIN; CAKMAK,HULYA; TAVMAN,SEBNEM.
Abstract: In this study effects of ultrasonic pretreatment with different sonication sources on drying behavior of carrot slices were evaluated. Fresh carrot slices were pretreated with ultrasonic probe at 65, 75 and 85 W or ultrasonic bath at 10, 20 and 30°C for 3, 5 and 10 min before air drying. Water gain % and solid loss % of pretreated samples were calculated and color values, β-carotene content and rehydration ratios of dried samples were determined. Drying behavior of the pretreated samples was evaluated and the drying data were fitted to thin layer drying models. Constant drying rate period was not observed for the carrot slices; however two definite falling-rate periods having different slopes were obtained. Drying time was significantly reduced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carrot; Ultrasound; Β-carotene; Rehydration; Modelling.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500905

Aedeagus morphology as a discriminant marker in two closely related Cactophilic species of Drosophila (Diptera; Drosophilidae) in South America
Provedor de dados: 42
Autores: Franco,Fernando F.; Prado,Pedro R.R.; Sene,Fábio M.; Costa,Luciano F.; Manfrin,Maura H.
Drosophila serido and D. antonietae are sibling species belonging to the Drosophila buzzatii cluster. Morphologically, they can only be discriminated by quantitative traits. In this paper we analyze the length and equalized average curvature of four regions of the aedeagus of D. antonietae and D. serido. Specimens of D. serido and D. antonietae were classified correctly 96.74% of the time. Based only on the variable that most contributed to the discrimination of the groups (equalized average curvature of the arch IV of the aedeagus), we observed significant intraspecific morphological divergence in D. serido in relation to the D. antonietae, in agreement with other markers. The high morphological divergence in equalized average curvature of the arch IV of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometric; Curvature; Drosophila buzzatii cluster; Aedeagus.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200002

Gas exchange and antioxidant activity in seedlings of C opaifera langsdorffii Desf. under different water conditions
Provedor de dados: 42
Autores: ROSA,DEREK B.C.J.; SCALON,SILVANA P.Q.; CREMON,THAIS; CECCON,FELIPE; DRESCH,DAIANE M.
ABSTRACT The aim of this study was to evaluate gas exchange, efficiency of the photosynthetic apparatus, and antioxidant activity in Copaifera langsdorffii Desf. The seedlings were cultivated under different conditions of water availability, in order to improve the utilization efficiency of available water resources. The seedlings were cultivated in four different water retention capacities (WRC- 25%, 50%, 75%, and 100%), and evaluated at four different time (T- 30, 60, 90, and 120 days). During the experimental period, seedlings presented the highest values for carboxylation efficiency of Rubisco (A/Ci), intrinsic water use efficiency (IWUE = A/gs), chlorophyll index, and stomatal opening, when grown in the substrate with 75% WRC, but the stomatal index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Chlorophyll a fluorescence; Photosynthesis; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603039

New parasite in a coprolite of 240 million years, biogeography of fossil coelacanths, and the influence of air pollutants in a coastal area of northeastern Brazil
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100001

Morphology of sympathetic chain in Saguinus niger
Provedor de dados: 42
Autores: PINTO,MARINA P.E.; BRANCO,ÉRIKA; FIORETTO,EMERSON T.; PEREIRA,LUIZA C.; LIMA,ANA R.
Saguinus niger popularly known as Sauim, is a Brazilian North primate. Sympathetic chain investigation would support traumatic and/or cancer diagnosis which are little described in wild animals. The aim of this study was to describe the morphology and distribution of sympathetic chain in order to supply knowledge for neurocomparative research. Three female young animals that came death by natural causes were investigated. Animals were fixed in formaldehyde 10% and dissected along the sympathetic chain in neck, thorax and abdomen. Cranial cervical ganglion was located at the level of carotid bifurcation, related to carotid internal artery. In neck basis the vagosympathetic trunk divides into the sympathetic trunk and the parasympathetic vagal nerve....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Primate; Saguinus niger; Sympathetic chain.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100365

Evaluation of growth performance and gastro-intestinal parameters on the response of weaned piglets to dietary organic acids
Provedor de dados: 42
Autores: GRECCO,HENRIQUE A.T.; AMORIM,ALESSANDRO B.; SALEH,MAYRA A.D.; TSE,MARCOS L.P.; TELLES,FILIPE G.; MIASSI,GABRIELA M.; PIMENTA,GUILHERME M.; BERTO,DIRLEI A.
ABSTRACT Two experiments (E) were carried out to evaluate the effects of fumaric acid and an acidifier blend [composed by calcium formate, calcium lactate and medium-chain fatty acids (capric and caprylic)] in piglet diets containing colistin (40 ppm) or halquinol (120 ppm) on performance, diarrhea incidence (E1), organs relative weight, pH values, intestinal morphometry and microbiota (E2). In E1, 192 and E2, 24 piglets weaned at 21-day-old were randomly assigned to blocks with 2x2 factorial arrangement of treatments [absence or presence of fumaric acid x absence or presence of acidifier blend], six replicates of eight (E1) and one piglet per pen (E2). For E1, the treatments were control (CD): no acidifier product + 40 ppm of colistin, FA: fumaric acid in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidifiers; Diarrhea; Nutrition; Pig; Weaning.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100401

Immune System Dysfunction in the Elderly
Provedor de dados: 42
Autores: FUENTES,EDUARDO; FUENTES,MANUEL; ALARCÓN,MARCELO; PALOMO,IVÁN.
ABSTRACT Human aging is characterized by both physical and physiological frailty that profoundly affects the immune system. In this context aging is associated with declines in adaptive and innate immunity established as immunosenescence. Immunosenescence is a new concept that reflects the age-associated restructuring changes of innate and adaptive immune functions. Thus elderly individuals usually present chronic low-level inflammation, higher infection rates and chronic diseases. A study of alterations in the immune system during aging could provide a potentially useful biomarker for the evaluation of immune senescence treatment. The immune system is the result of the interplay between innate and adaptive immunity, yet the impact of aging on this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aging; Immunosenescence; Adaptive immunity; Innate immunity; Inflammation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100285

A closer look at the Impact Factor (JCR 2012): problems, concerns and actions needed
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.; AZEVEDO,RICARDO A.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300859

Oxidative stress and fish immune system: phagocytosis and leukocyte respiratory burst activity
Provedor de dados: 42
Autores: BILLER,JAQUELINE D.; TAKAHASHI,LEONARDO S.
Abstract Molecular oxygen is a necessary compound for all aerobic organisms, although oxygen is a potent oxidant, which can cause oxidative stress (OS). OS occurs when there is an imbalance between the production of oxidant and antioxidants components, are result of normal cell metabolism, and many of these compounds play a fundamental role in several metabolic pathways. The organism produces several reactive oxygen species (ROS), but they are balanced by an antioxidant defense system that maintains the levels of these oxidizing compounds at an acceptable level. Many of these components are essential in the organism defense and their byproducts are considered potent bactericides that actively act in the destruction of invading pathogens. Fish immune system...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reactive oxygen species; Innate immunity; Antioxidant system; Free radical.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703403

Immunology and immunopathology of African trypanosomiasis
Provedor de dados: 42
Autores: Vincendeau,Philippe; Bouteille,Bernard.
Major modifications of immune system have been observed in African trypanosomiasis. These immune reactions do not lead to protection and are also involved in immunopathology disorders. The major surface component (variable surface glycoprotein,VSG) is associated with escape to immune reactions, cytokine network dysfunctions and autoantibody production. Most of our knowledge result from experimental trypanosomiasis. Innate resistance elements have been characterised. In infected mice, VSG preferentially stimulates a Th 1-cell subset. A response of &lt;FONT FACE=Symbol&gt;gd&lt;/FONT&gt; and CD8 T cells to trypanosome antigens was observed in trypanotolerant cattle. An increase in CD5 B cells, responsible for most serum IgM and production of autoantibodies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosome; African trypanosomiasis; Immunology; Macrophage; Lymphocytes; Nitric oxide; Cytokine; Autoantibodies.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400004

Leaf area estimation from linear measurements in different ages of Crotalaria juncea plants
Provedor de dados: 42
Autores: CARVALHO,JULIANA O. DE; TOEBE,MARCOS; TARTAGLIA,FRANCIELI L.; BANDEIRA,CIRINEU T.; TAMBARA,ANDRÉ L.
ABSTRACT The goal of this study was to estimate the leaf area of Crotalaria juncea according to the linear dimensions of leaves from different ages. Two experiments were conducted with C. juncea cultivar IAC-KR1, in the 2014/2015 sowing seasons. At 59, 82, 102, 129 days after sowing (DAS) of the first and 61, 80, 92, 104 DAS of the second experiment, 500 leaves were collected, totaling 4,000 leaves. In each leaf, the linear dimensions were measured (length, width, length/width ratio and length × width product) and the specific leaf area was determined through Digimizer and Sigma Scan Pro software, after scanning images. Then, 3,200 leaves were randomly separated to generate mathematical models of leaf area (Y) in function of linear dimension (x), and 800...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Non-destructive method; Image processing; Mathematical models; Model validation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401851

Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism
Provedor de dados: 42
Autores: RODRIGUES,BRUNO V.B.; AGUIAR-NETO,MANOEL B.; OLIVEIRA,UBIRAJARA DE; SANTOS,ADALBERTO J.; BRESCOVIT,ANTONIO D.; MARTÍNS,MARLÚCIA B.; BONALDO,ALEXANDRE B.
ABSTRACT A list of spider species is presented for the Belém Area of Endemism, the most threatened region in the Amazon Basin, comprising portions of eastern State of Pará and western State of Maranhão, Brazil. The data are based both on records from the taxonomic and biodiversity survey literature and on scientific collection databases. A total of 319 identified species were recorded, with 318 occurring in Pará and only 22 in Maranhão. About 80% of species are recorded at the vicinities of the city of Belém, indicating that sampling effort have been strongly biased. To identify potentially high-diversity areas, discounting the effect of variations in sampling effort, the residues of a linear regression between the number of records and number of species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Araneae; Diversity; Fragmentation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401543

Tau, APP, NCT and BACE1 in lymphocytes through cognitively normal ageing and neuropathology
Provedor de dados: 42
Autores: HERRERA-RIVERO,MARISOL; SOTO-CID,ABRAHAM; HERNáNDEZ,MARíA E.; ARANDA-ABREU,GONZALO E.
Although Alzheimer's disease is a brain disorder, a number of peripheral alterations have been found in these patients; however, little is known about how the key genes involved in the pathophysiology express in peripheral cells such as lymphocytes during normal compared to neuropathological ageing. We analysed the expression of tau, of the amyloid precursor protein, of nicastrin and of the β-site APP cleaving enzyme genes by RT-PCR in lymphocytes from a small group of late-onset Alzheimer's disease patients, from aged patients suffering from neuropsychological conditions different from Alzheimer's and from cognitively healthy subjects divided in four groups by age. We also investigated correlations between gene expression and levels of blood pressure,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alzheimer's disease; APP; BACE1; Nicastrin; Normal ageing; Risk factors.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401489

Taxonomic notes on Lyroglossa and Pteroglossa (Orchidaceae: Spiranthinae): two new generic records for the flora of Rio Grande do Sul
Provedor de dados: 42
Autores: BUZATTO,CRISTIANO ROBERTO; SINGER,RODRIGO B.; BORDIGNON,SÉRGIO A.L.
Lyroglossa and Pteroglossa(Orchidaceae: Spiranthinae) are first recorded for Rio Grande do Sul. Descriptions, illustrations, taxonomic notes and distribution are presented. We also provide an artificial key to distinguish the genera of the “Stenorrhynchos Clade” reported so far in Rio Grande do Sul.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; “Stenorrhynchos Clade”; Taxonomy; Terrestrial orchids.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200821

Feeding ecology of the Neotropical otter Lontra longicaudis in the Lower Arroio Grande River, southern Brazil
Provedor de dados: 42
Autores: Souza,Kleisson S.; Bastazini,Vinicius A.G.; Colares,Elton P.
The present study was based on the analysis of spraints (n = 294) collected between December 2005 and November 2007. The importance of each type of prey was determined by absolute and relative frequency. Niche breadth was also estimated. The results were reported as mean (± SD) of relative frequencies. Fish were the main prey found in spraints (57.8 ± 7.0%). Fish from Callichthyidae family were the main prey, followed by Cichlidae, the species Hoplias malabaricus and the family Characidae. The frequencies of other fish and taxa were lower than 13.9% (absolute frequency) and 5.6% (relative frequency). Despite significant seasonal variations, (P = 0.001), niche breadth values were low in all seasons (0.39 ± 0.11). Therefore, Lontra longicaudis presented a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Neotropical otter; Niche breadth; Seazonal; Southern Brazil.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100285

Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)
Provedor de dados: 42
Autores: Zink,Klaus-Gerhard; Furtado,André L. S.; Casper,Peter; Schwark,Lorenz.
Freshwater lagoons comprise important coastal ecosystems and natural buffers between urbanized land areas and open ocean in the Rio de Janeiro State, Brazil. Studies of sediment and water chemistry, zooplankton and bacterial communities to assess the extent of anthropogenic disturbance are available. Here we contribute with an organic-geochemical approach supplemented by some microbiological aspects to complete the characterization of these lagoonal ecosystems. Bulk organic matter and extractable lipids (aliphatic hydrocarbons, alcohols and fatty acids, sterols) were investigated from two locations per lagoon: at the seaward site and landward ends - and at two depth intervals (0-3 and 3-6 cm) per site. Urbanized Imboacica Lagoon received increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoons; Aqueous/terrigenous bioproduction; Lipids; Fatty acids; Sterols; Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100004

Purification and characterization of a thermostable alkaline cellulase produced by Bacillus licheniformis 380 isolated from compost
Provedor de dados: 42
Autores: MARCO,ÉVILIN G. DE; HECK,KARINA; MARTOS,EMERSON T.; VAN DER SAND,SUELI T.
ABSTRACT During composting processes, the degradation of organic waste is accomplished and driven by a succession of microbial populations exhibiting a broad range of functional competencies. A total of 183 bacteria, isolated from a composting process, were evaluated for cellulase activity at different temperatures (37, 50, 60, and 70°C) and pH values. Out of the 22 isolates that showed activity, isolate 380 showed the highest cellulase activity. Its ability to produce cellulase was evaluated in culture medium supplemented with carboxymethyl cellulose, microcrystalline cellulose, wheat straw, and rice husk. The culture medium supplemented with carboxymethyl cellulose induced higher enzyme activity after 6 hours of incubation (0.12 UEA mL-1 min-1). For...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkalophilic enzyme; Carboxymethyl celullase; Compost; High temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502359

Regular exercise, overweight/obesity and sedentary lifestyle cause adaptive changes in thiol–disulfide homeostasis
Provedor de dados: 42
Autores: GOL,MEHMET; ÖZKAYA,BEYTULLAH; YILDIRIM,CANER; BAL,RAMAZAN.
Abstract: Dynamic thiol–disulfide homeostasis is considered to have critical roles in maintenance of physiological functioning. We aimed to reveal whether there is any specific aberration in thiol–disulfide homeostasis in three distinct categories of individuals, including those who 1) exercise regularly (fitness group), 2) have a sedentary lifestyle (sedentary group) and 3) are overweight or obese (overweight/obese group). 72 male individuals were included in the study, 21 of whom were in fitness group, 28 of whom were overweight or obese and 23 of whom had a sedentary lifestyle. Plasma native thiol (-SH) and total thiol [(-SH) + (-S-S-)] levels were quantitatively determined. Total thiol levels in sedentary group were significantly lower than those in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise; Obesity; Oxidative stress; Thiol-disulfide homeostasis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300801

Farming with rocks and minerals: challenges and opportunities
Provedor de dados: 42
Autores: Van Straaten,Peter.
In many parts of the world food security is at risk. One of the biophysical root causes of falling per-capita food production is the declining quality and quantity of soils. To reverse this trend and increase soil fertility soil and plant nutrients have to be replenished. This review provides a literature survey of experiences of using multi-nutrient rock fertilizers for soil fertility enhancement from temperate and tropical environments. Advantages and limitations of the application of rock fertilizers are discussed. Examples are provided from two successful nutrient replenishment projects in Africa where locally available rock fertilizers are used on highly leached acid soils. The potential of combining organic materials alongside rock fertilizers in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil nutrient replenishment; Rock fertilizer; Phosphate rock.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400009

Human mobility on the Brazilian coast: an analysis of strontium isotopes in archaeological human remains from Forte Marechal Luz Sambaqui
Provedor de dados: 42
Autores: Bastos,Murilo Q. R; Souza,Sheila M. F. Mendonça de; Santos,Roberto V; Lima,Bárbara A. F; Santos,Ricardo V; Rodrigues-Carvalho,Claudia.
This study investigated strontium isotopes in the dental enamel of 32 human skeletons from Forte Marechal Luz sambaqui (shellmound), Santa Catarina, Brazil, aiming at identifying local and non-local individuals. The archeological site presents pot sherds in the uppermost archeological layers. Dental enamel was also examined from specimens of terrestrial fauna (87Sr/86Sr = 0. 71046 to 0. 71273) and marine fauna (87Sr/86Sr = 0. 70917). The 87Sr/86Sr isotope ratio for individuals classified as locals ranged from 0. 70905 to 0. 71064 and was closer to the isotope ratio of the seawater than to the ratio of the terrestrial fauna, indicating a strong influence of marine strontium on the inhabitants of this sambaqui. The results indicate the existence of three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Human mobility; Isotopes; Prehistory; Shellmounds; Strontium.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200030

Dating minerals by ID-TIMS geochronology at times of in situ analysis: selected case studies from the CPGeo-IGc-USP laboratory
Provedor de dados: 42
Autores: Passarelli,Cláudia R.; Basei,Miguel A.S.; Siga Jr.,Oswaldo; Sato,Kei; Sproesser,Walter M.; Loios,Vasco A.P.
Since 1964, the Center for Geochronological Research - CPGeo, one of the interdepartmental centers of the Instituto de Geociências (IG) of São Paulo University, has developed studies related to several geological processes associated with different rock types. Thermal Ionization Mass Spectrometry Isotopic Dilution (ID-TIMS) has been the technique widely used in the CPGeo U-Pb Laboratory. It provides reliable and accurate results in age determination of superposed events. However, the open-system behavior such as Pb-loss, the inheritance problem and metamictization processes allow and impel us to a much richer understanding of the power and limitations of U-Pb geochronology and thermochronology. In this article, we present the current methodology used at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: U-Pb ID-TIMS methodology; U-Pb geochronology of accessory minerals; CPGeo-IGc-USP U-Pb laboratory.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100010

Anatomy and morphometric aspects of the trachea of Saimiri sciureus Linnaeus, 1758: knowledge for emergency procedures
Provedor de dados: 42
Autores: Pinheiro,Luane L.; Lima,Ana R.; Muniz,José A.P.C.; Imbeloni,Aline; Fioreto,Emerson T.; Fontes,Rodrigo F.; Cabral,Rosa; Branco,Érika.
The aim of this work is to study the morphological characteristics of the trachea of Saimiri sciureus through quantification and measurement of the cartilaginous rings, providing information to facilitate the election of more appropriate endotracheal tube, laryngeal mask or tracheostomy tube for anesthetic and emergency procedures, as it is a species of Neotropical primates most commonly used as biological models, and little is known about their morphology. Nine animals were investigated, being 4 adults and 5 young acquired from the Centro Nacional de Primatas (National Primate Center - CENP) - Ananindeua - PA, which died from natural causes and then fixed in aqueous buffered formalin 10%. Saimiri sciureus trachea comprises an average of 32.8 incomplete...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emergency procedure; Morphology; Respiratory system; Saimiri sciureus; Trachea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400012

A new Amphisbaena (Squamata: Amphisbaenidae) from southern Espinhaço Range, southeastern Brazil
Provedor de dados: 42
Autores: Costa,Henrique C.; Resende,Flávia C.; Teixeira Jr.,Mauro; Vechio,Francisco Dal; Clemente,Cinara A.
A new species of Amphisbaena is described from a semi-deciduous forest in Conceição do Mato Dentro, southern Espinhaço Range, Minas Gerais, Brazil. The following combined characters can diagnose the new species from all congeners: head round-shaped; two or three precloacal pores sequentially arranged; 190-199 body annuli; 2-3 lateral annuli; 23-25 caudal annuli; autotomy sites on caudal annuli 7-9; 12-14 dorsal segments on midbody annulus; 14-16 ventral segments on midbody annulus; three supralabials; three infralabials; postmalar row present or absent; dorsum light brown, with cream intersegmental sutures; venter cream. To date, the new species is known only from the Espinhaço Range, highlighting the importance of conservation actions for these mountains.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minas Gerais; Taxonomy; Amphisbaenia; Fossorial reptile.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200891

Development of a real-time PCR assay for the detection of the golden mussel ( Limnoperna fortunei , Mytilidae) in environmental samples
Provedor de dados: 42
Autores: PIE,MARCIO R.; STRÖHER,PATRÍCIA R.; AGOSTINIS,ANDRÉ O.; BELMONTE-LOPES,RICARDO; TADRA-SFEIR,MICHELLE Z.; OSTRENSKY,ANTONIO.
ABSTRACT The golden mussel, Limnoperna fortunei, is among the most devastating invasive species in freshwater habitats worldwide, leading to severe environmental disturbances and economic losses. Therefore, management efforts would be greatly improved by methods that efficiently detect and quantify the abundance of the golden mussel in freshwater habitats, particularly in early stages of colonization. In this study, we describe a highly-sensitive real-time PCR assay targeting a 100-bp region of the COI mitochondrial gene of the golden mussel. The method was able to detect as little as 0.225 pg of target DNA. This assay represents an important contribution to surveillance methods, as well as to optimize field measures to contain and manage populations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDNA; Invasive species; Environmental DNA; Molecular identification.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301041

Ecology and biotechnological potential of bacterial community from three marine sponges of the coast of Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: ARAÚJO,FÁBIO V. DE; NETTO,MARCELLE C.M.; AZEVEDO,GUSTAVO P.; JAYME,MARCELLY M.A.; NUNES-CARVALHO,MONICA C.; SILVA,MARIANA M.; CARMO,FLÁVIA L. DO.
ABSTRACT Marine sponges has been a large reservoir of microbial diversity, with the presence of many species specific populations as well as producing biologically active compounds, which has attracted great biotechnological interest. In order to verify the influence of the environment in the composition of the bacterial community present in marine sponges and biotechnological potential of bacteria isolated from these organisms, three species of sponges and the waters surrounding them were collected in different beaches of Rio de Janeiro, Brazil. The profile of the bacterial community present in sponges and water was obtained by PCR-DGGE technique and the biotechnological potential of the strains isolated by producing amylase, cellulase, protease and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial diversity; Biosurfactants; Enzymes; Marine sponges; PCR-DGGE.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602785

Anthranilic acids from isatin: an efficient, versatile and environmentally friendly method
Provedor de dados: 42
Autores: RIO,GABRIEL F.; SILVA,BÁRBARA V.; MARTINEZ,SABRINA T.; PINTO,ANGELO C.
This paper describes the preparation of a series of 16 anthranilic acids in yields ranging from 51 to 97%, by treating the isatins with NaOH and H2O2. Independently of the nature of the substituent on the aromatic ring, the reactions were complete in 15 min at room temperature, whereas those of isatins containing a substituent on the nitrogen atom required longer reaction time for completion (45 min) under the same reaction conditions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isatin; Anthranilic acid; 2-aminobenzoic acid; Isatin oxidation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401525

Deficit of sand in a sediment transport model favors coral reef development in Brazil
Provedor de dados: 42
Autores: Bittencourt,Abílio C.S.P.; Leão,Zelinda M.A.N.; Kikuchi,Ruy K.P.; Dominguez,José M.L.
This paper shows that the location of the shoreface bank reefs along the northeastern and eastern coasts of Brazil, in a first order approximation, seem to be controlled by the deficit of sediment in the coastal system. The sediment transport pattern defined by a numerical modeling of wave refraction diagrams, representing circa 2000 km of the northeastern and eastern coasts of Brazil, permitted the regional-scale reproduction of several drift cells of net longshore sediment transport. Those drift cells can reasonably explain the coastal sections that present sediment surplus or sediment deficit, which correspond, respectively, to regions where there is deposition and erosion or little/no deposition of sand. The sediment deficit allows the exposure and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment deficit; Longshore drift; Coral reefs; Northeast Brazil.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100015

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches
Provedor de dados: 42
Autores: BRAGA,GUSTAVO G.; BECKER,VANESSA.
Abstract  Significant reductions in the water levels of lakes are influenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater. The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an extended drought in a semi-arid lake. Another objective was to compare two functional approaches to test which one of these best captures phytoplankton variability as a function of environmental variability. Multivariate analyses performed using the Reynolds Functional Groups (RFG) and Morphology-Based Functional Groups (MBFG) classification schemes indicated two periods, high and a low water volume. The results demonstrated the importance of light...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydric deficit; Cyanobacteria; Eutrophication; Reynolds Functional Groups; Morphology-Based Functional Groups.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100707

Beach ridges, foredunes or transgressive dunefields? Definitions and an examination of the Torres to Tramandaí barrier system, Southern Brazil
Provedor de dados: 42
Autores: Hesp,Patrick A.; Dillenburg,Sergio R.; Barboza,Eduardo G.; Tomazelli,Luiz J.; Ayup-Zouain,Ricardo N.; Esteves,Luciana S.; Gruber,Nelson L.S.; Toldo-Jr.,Elirio E.; Tabajara,Luiz L.C. de A.; Clerot,Luiz C.P.
Many prograded barriers and some dunefields in theworld have been termed 'beach ridge' plains, but the actual genesis of the 'ridges' is often unknown. Use of the terms, berms, beach ridges and foredunes is also confusing in the literature because their definitions are highly variable and are commonly used interchangeably. Thus, the formation and definition of sand berms, beach ridges and foredunes is briefly reviewed. Beach ridges are re-defined as entirely wave formed deposits which are most commonly formed during high wave conditions and/or elevated water levels (e.g. storm surges). Foredunes are formed by aeolian sand deposition in vegetation on the backshore. Some dunefields in Brazil have been called beach ridge plains when they are, in fact,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beach ridges; Coastal barriers; Transgressive dunefields; Holocene; Southern Brazil.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300010

Parameters from the community of leaf-litter frogs from Estação Ecológica Estadual Paraíso, Guapimirim, Rio de Janeiro State, southeastern Brazil
Provedor de dados: 42
Autores: Rocha,Carlos F.D.; Vrcibradic,Davor; Kiefer,Mara C.; Siqueira,Carla C.; Almeida-Gomes,Mauricio; Borges Júnior,Vitor N.T.; Hatano,Fábio H.; Fontes,Angélica F.; Pontes,Jorge A.L.; Klaion,Thais; Gil,Lívia O.; Sluys,Monique Van.
We studied the leaf-litter frog community of Estação Ecológica Estadual Paraíso, in Guapimirim, Rio de Janeiro State, southeastern Brazil. Herein we combined three sampling methods (large plots, visual encounter surveys and pit-fall traps) to present data on species composition, richness, relative abundance and densities. The local assemblage of frogs associated to the leaf-litter was composed by 14 species, belonging to nine families. Haddadus binotatus, a direct-developing frog, was the most abundant species in the community. The estimated density of the local leaf-litter frog assemblage based on plot sampling was 4.3 frogs/100 m². Haddadus binotatus had the highest density (1.1 ind/100 m²). Frogs were predominantly found at night. Thoropa miliaris had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Atlantic Forest; Brazil; Community parameters; Density; Leaf-litter.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400013

In vitro antimalarial activity of six Aspidosperma species from the state of Minas Gerais (Brazil)
Provedor de dados: 42
Autores: Dolabela,Maria Fâni; Oliveira,Salma G.; Peres,José M.; Nascimento,José M.S.; Póvoa,Marinete M.; Oliveira,Alaide B.
Ethnomedicinal informations point to some Aspidosperma species (Apocynaceae) as antimalarial plants in Brazil and have motivated the evaluation of six species which were collected in the state of Minas Gerais: A. cylindrocarpon Müll. Arg., A. parvifolium A. DC., A. olivaceum Müll. Arg., A. ramiflorum Müll. Arg., A. spruceanum Benth. ex Müll. Arg. and A. tomentosum Mart.. A total of 23 extracts of different plant parts in different solvents were assayed in vitro against chloroquine-resistant (W2) and chloroquine-sensitive (3D7) strains of Plasmodium falciparum. All the extracts were shown to be active with IC50 values in the range of 5.0 ± 0 2.8 µg/mL to 65.0 ± 4.2 µg/mL. TLC profile of the extracts revealed the presence of alkaloids in the six species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimalarial activity; Plasmodium falciparum; In vitro assays; Aspidosperma spp.; Apocynaceae.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400005

Characterization of crustacean central glia
Provedor de dados: 42
Autores: SILVA,SIMONE F. DA; BRESSAN,CRISTINE M.; BITTENCOURT-NAVARRETE,RUBEN; CAVALCANTE,LENY A.; ALLODI,SILVANA.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300022

An elementary proof of MinVol(Rn) = 0 for n &gt; 3
Provedor de dados: 42
Autores: Mei,Jiaqiang; Wang,Hongyu; Xu,Haifeng.
In this paper, we give an elementary proof of the result that the minimal volumes of R³ and R4 are zero. The approach is to construct a sequence of explicit complete metrics on them such that the sectional curvatures are bounded in absolute value by 1 and the volumes tend to zero. As a direct consequence, we get that MinVol (Rn) = 0 for n &gt; 3.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minimal volume; Smooth gluing; Bounded geometry.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400002

Determination of Drilling Rate Index Based on Rock Strength Using Regression Analysis
Provedor de dados: 42
Autores: YENICE,HAYATI.
Abstract: Drillability is influenced by many factors, including machine parameters and rock properties. The main machine parameters for drilling include rotational speed, thrust force, torque and flush pressure. The specific rock characteristics that affect penetration rate comprise uniaxial compressive strength (UCS), tensile strength, Young’s modulus, hardness and brittleness. In this study, drilling rate index (DRI) is attempted to predict based on UCS and Brazilian tensile strength (BTS) of rocks. Simple and multiple regression analyses have been carried out to determine the best measure of the relation between DRI and two geomechanical properties. The DRI value is strongly related to the uniaxial compressive strength and indirect tensile strength....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drillability; Uniaxial compressive strength; Tensile strength; Regression analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500906

Variation in the behavioral responses of Budgerigars Melopsittacus undulatus to an alarm call in relation to sex and season
Provedor de dados: 42
Autores: Nicolas,Gérard; Fraigneau,Cloé; Aubin,Thierry.
In the Budgerigar Melopsittacus undulatus, the significance of a conspecific alarm call was investigated in two seasons, winter and spring. Two qualitatively different behavioral responses were displayed by the receivers in reply to playbacks: call(s) and/or taking flight(s). The comparative analysis of the number of birds responding to the alarm and to the control signals revealed two major facts: 1) in both seasons, the responses to the alarm signal were only observed for females, not for males, 2) qualitatively, females exhibited a great inter-season variability in their behavioral responses to the hearing of an alarm call. In winter, the females were more predisposed to emit acoustic responses while in spring they mainly took flight.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Budgerigars; Alarm call; Sex; Season; Response plasticity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200025

Productive performance of Holstein calves finished in feedlot or pasture
Provedor de dados: 42
Autores: DIAS,ANA MARIA O.; MENEZES,LUIS F.G. DE; PARIS,WAGNER; SANTOS,PRISCILA V. DOS; BIESEK,RONALDO R.; MAFIOLETTI,RENAN D.; MARCHESAN,RENATO.
ABSTRACT The use of animals from dairy farms is an alternative to meat production since it provides an increment of total income for farmers. This study aims to evaluate the performance of Holstein calves finished in two feeding systems (feedlot or pasture). Forty-three animals with 58 days old and 57 kg were divided in two treatments: 23 animals finished in feedlot with corn silage plus concentrate based on corn and soybean meal (40:60); 20 animals kept in cultivated pastures according to the period of the year: Italian ryegrass (Lolium multiflorum) and pearl millet (Pennisetum americanum) with supplementation with the same feedlot-concentrate at 1% body weight. Animals were slaughtered with 200 kg. Dry matter and nutrient intake were determined, with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Forage intake; Chromium oxide; Feeding systems.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401935

Local Anesthetic Activity from Extracts, Fractions and Pure Compounds from the Roots of Ottonia anisum Spreng. (Piperaceae)
Provedor de dados: 42
Autores: LÓPEZ,KELVIN S.E.; MARQUES,ANDRÉ M.; MOREIRA,DAVYSON DE L.; VELOZO,LEOSVALDO S.; SUDO,ROBERTO T.; ZAPATA-SUDO,GISELE; GUIMARÃES,ELSIE F.; KAPLAN,MARIA AUXILIADORA C.
ABSTRACT Piperaceae species can be found worldwide in tropical and subtropical areas and many of them have been used for centuries in traditional folk medicine and in culinary. In Brazil, species of Piperaceae are commonly used in some communities as local anesthetic and analgesic. Countrified communities have known some species of the genus Ottonia as "anestesia" and it is a common habit of chewing leaves and roots of Ottonia species to relief toothache. The purpose of this study is to report our findings on new molecules entities obtained from the roots of Ottonia anisum Spreng, in which local anesthetic activity (sensory blockage) is demonstrated for the first time in vivo guinea pig model. Phytochemical investigation led to the isolation of three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piperaceae; Piper; Ottonia; Amides; Anesthetic properties; Sensory blockage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602229

Pre-Columbian human occupation of Amazonia and its influence on current landscapes and biodiversity
Provedor de dados: 42
Autores: MCKEY,DOYLE.
Abstract: There is growing evidence that pre-Columbian humans had strong impacts on soils, plant and animal communities and ecosystem functioning in many parts of Amazonia, and that the legacies of these impacts still affect biodiversity and how ecosystems function today. Understanding the history of human/environment interactions in Amazonia is essential for analyzing the current state of these interactions and imagining scenarios for the future. This study gives a brief overview of these themes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian Dark Earths; Ecological legacy; Historical ecology; Pleistocene megafaunal extinctions; Pre-Columbian raised fields.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600607

Population ecology of the blue crab Callinectes danae (Crustacea: Portunidae) in a Brazilian tropical estuary
Provedor de dados: 42
Autores: Araújo,Marina S.L.C.; Barreto,Aline V.; Negromonte,Aurinete O.; Schwamborn,Ralf.
This paper aims at describing the population ecology of the swimming crab Callinectes danae Smith, 1869 in one of the most productive estuaries of Brazil, the Santa Cruz Channel. These crabs were monthly collected from January to December/2009 at four stations along the channel, two in the upper and two in the lower estuary. A total of 2373 specimens of C. danae were collected during the study. Males had a larger average carapace width than non-ovigerous females (60.0 ± 15.6 mm and 52.9 ± 12.4 mm, respectively), an adaptation that gives greater protection for females during the copulation. Overall sex ratio did not differ significantly from 1:1. However, evaluating sex-ratio by sampling area, males and juveniles of both sexes occurred preferentially in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Population biology; Santa Cruz Channel; Sexual dimorphism.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100013

Plankton diversity and limnological characterization in two shallow tropical urban reservoirs of Pernambuco State, Brazil
Provedor de dados: 42
Autores: Almeida,Viviane L.S.; Melão,Maria da Graça G.; Moura,Ariadne N.
Plankton diversity, physical and chemical variables and chlorophyll a were analyzed in two shallow urban reservoirs with different trophic degrees on Pernambuco State, northeastern Brazil. High eutrophication levels were observed in Apipucos reservoir, while Prata reservoir was considered oligotrophic. Values reported for physical and chemical variables and chlorophyll a differed among the studied ecosystems. Richness and plankton diversity were higher in Apipucos reservoir especially for phytoplankton. The presence of potential toxic Cyanophyceae in both reservoirs reflects a problem mainly to Prata reservoir, which is used for public water supply. Differences were observed for some variables among sites of study in Apipucos reservoir, while the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeastern Brazil; Phytoplankton; Trophic status; Zooplankton.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200022

The tides and tidal circulation of Todos os Santos Bay, Northeast Brazil: a general characterization
Provedor de dados: 42
Autores: LESSA,GUILHERME C.; DOMINGUEZ,JOSÉ M. L.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO.
The Todos os Santos Bay, located on northeastern Brazil, is the second largest coastal bay in the country, after São Marcos Bay. The three main drainage basins convey an average of 120 m³/s of freshwater towards the bay, the majority of it, however, held by a dam in Paraguaçu River since 1985. The original average freshwater inflow was two orders of magnitude smaller than the estimated tidal discharge through the main bay entrance, and the oceanographic characteristics of the bay, as indicated by bay salinity measurements, are clearly marine. The tides are semi-diurnal, and are amplified up the bay by a factor of 1.5. Shallow water constituents become more important as the tide propagates along Paraguaçu Channel and Paraguaçu River, where they generate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tides; Baía de Todos os Santos; Tidal currents.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200009

Endoscopic and symptoms analysis in Mexican patients with irritable Bowel syndrome, dyspepsia, and gastroesophageal reflux disease
Provedor de dados: 42
Autores: Camacho,Santiago; Bernal,Fernando; Abdo,Miguel; Awad,Richard A.
The aim of this study was to analyze the data of endoscopy and symptoms in 118 Mexican patients with irritable bowel syndrome (IBS), dyspepsia, non-erosive reflux disease (NERD) and erosive esophagitis (EE). IBS criteria were fulfilling for dyspepsia patients in 47%, for NERD in 48%, and for EE patients in 48% of cases. Esophagitis was present in 42% of patients with IBS and in 45% of patients with dyspepsia. A higher prevalence of hiatus hernia was found in EE vs. NERD. Heartburn and acid eructation were associated with the presence of esophagitis; acid eructation, regurgitation and nocturnal pain with duodenitis; and heartburn and regurgitation with hiatus hernia. Males more frequently reported: ucus in feces, abdoinal distension, nausea and gastritis;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dyspepsia; Endoscopy; Irritable bowel syndrome; Overlap; Reflux disease; Symptoms.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400018

Note on the paleobiogeography of Compsognathidae (Dinosauria: Theropoda) and its paleoecological implications
Provedor de dados: 42
Autores: SALES,MARCOS A.F.; CASCON,PAULO; SCHULTZ,CESAR L.
The paleobiogeography of the theropod clade Compsognathidae is here reaccessed in order to test the hypothesis of this taxon being adapted specifically to inhabit semi-arid environments. Data about localities where these fossils were collected and their paleoenvironments were gathered from the literature. Compsognathids seem to be found especially in sedimentary deposits known as Fossil Lagerstätten, which were formed under a set of specific conditions that allowed the preservation of the fragile bone remains of these animals. This bias limits an accurate analysis of the historical and/or ecological paleobiogeography of this taxon. Actually, it is possible that compsognathids had an almost worldwide distribution during the Mesozoic Era. Their occurrence in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compsognathidae; Fossil Lagerstätten; Fossil record; Paleobiogeography; Paleoecology; Theropoda.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100127

Holocene paleo-sea level changes along the coast of Rio de Janeiro, southern Brazil: Comment on Castro et al. (2014)
Provedor de dados: 42
Autores: ANGULO,RODOLFO J.; GIANNINI,PAULO C.F.; SOUZA,MARIA CRISTINA DE; LESSA,GUILHERME C.
ABSTRACT The present work discusses and reinterprets paleo-sea level indicators used to build Holocene sea-level curve for the coast of Rio de Janeiro at former works. We conclude that: (a) the paleo-sea levels inferred by vermetid remains show that sea-level has fallen over the past 4400 years, at least; (b) the paleo-sea level inferred by the beachrock facies and dated shells of Jaconé shows that sea-level was near the present elevation between 8198 and 5786 years before present; and (c) several shells from other beachrocks were deposited probably thousands of years after the specimens died and consequently do not allow precise reconstructions of paleo-sea levels. These conclusions differ from the conclusions of the original paper.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beachrock; Paleo-sea level reinterpretation; Sea-level curve; Vermetids; Tetraclita stalactifera.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602105

Influence of microhabitat on the richness of anuran species: a case study of different landscapes in the Atlantic Forest of southern Brazil
Provedor de dados: 42
Autores: FIGUEIREDO,GUILHERME DE T.; STORTI,LUIS FERNANDO; LOURENÇO-DE-MORAES,RICARDO; SHIBATTA,OSCAR A.; ANJOS,LUIZ DOS.
Abstract: Environmental heterogeneity is a factor which can help explain the higher local species richness. The objective of this study was to test if richness and composition of anurans species are related to available microhabitats and landscape type of sampled sites. We assume that a higher number of microhabitats increase environmental heterogeneity and this, in turn, affects species richness of amphibians. We performed the study in the Mesophytic Semideciduous Forest, a vegetation type within Atlantic Forest Domain. Between October 2010 and February 2011, we sampled 23 water bodies located in the agricultural, forest, and urban landscapes. The species richness was determined using survey at breeding sites methodology, and the availability of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Anthropic actions; Biodiversity; Fragmentation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300615

Titanosauriform teeth from the Cretaceous of Japan
Provedor de dados: 42
Autores: Saegusa,Haruo; Tomida,Yukimitsu.
Sauropod teeth from six localities in Japan were reexamined. Basal titanosauriforms were present in Japan during the Early Cretaceous before Aptian, and there is the possibility that the Brachiosauridae may have been included. Basal titanosauriforms with peg-like teeth were present during the "mid" Cretaceous, while the Titanosauria with peg-like teeth was present during the middle of Late Cretaceous. Recent excavations of Cretaceous sauropods in Asia showed that multiple lineages of sauropods lived throughout the Cretaceous in Asia. Japanese fossil records of sauropods are conformable with this hypothesis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sauropod; Titanosauriforms; Tooth; Cretaceous; Japan.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100014

Disector Z-axis mechanical method for stereology
Provedor de dados: 42
Autores: Xavier-Vidal,Ricardo.
The purpose of this work is to calibrate a not expensive microscope to be applied in Optical Disector estimation. The evaluation of "Z-axis" bias and the "Z-axis" calibration were made utilizing a cover slip and a "manual digimatic outside micrometer scale" (Mitutoyo, Japan). Calibrating the cover slip we performed the calibration of the "Z-axis" of a microscope. In the cover slip two lines were painted with different colors using a pen glass. A blue line was painted on the up surface and another line (red) on the bottom surface of the cover slip forming a cross. Two metal rings with one palette welded in each were adapted in the microscope. Other palette was welded in the gross focuses in order to restrict the route of the fine focuses (Z-axis study)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stereology; Disector; Optical disector; Morphometry; Z-axis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200028

An overview of the appendicular skeletal anatomy of South American titanosaurian sauropods, with definition of a newly recognized clade
Provedor de dados: 42
Autores: RIGA,BERNARDO J. GONZÁLEZ; LAMANNA,MATTHEW C.; OTERO,ALEJANDRO; DAVID,LEONARDO D. ORTIZ; KELLNER,ALEXANDER W.A.; IBIRICU,LUCIO M.
Abstract: In the last two decades, the number of phylogenetically informative anatomical characters recognized in the appendicular skeleton of titanosaurian sauropod dinosaurs has increased dramatically with the discovery of new and comparatively complete specimens. Here we provide an overview of the appendicular skeletal morphology of South American titanosaurs and discuss its significance for phylogenetic reconstruction. The appendicular skeletal diversity of South American titanosaurs is substantially greater than was initially appreciated. Moreover, some regions of the appendicular skeleton, such as the pes, exhibit remarkable variability in form. Multiple synapomorphies of Titanosauria and the less inclusive clades Lithostrotia and Saltasauridae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Titanosauria; South America; Appendicular skeleton; Osteology; Phylogeny; Colossosauria.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400514

Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil)
Provedor de dados: 42
Autores: MAIA,VALÉRIA C.; MASCARENHAS,BERNARDO.
ABSTRACT The Parque Nacional do Itatiaia (PNI) (Brazilian Southeast Region) was surveyed monthly for insect galls from February/2014 to December/ 2015. A total of 432 gall morphotypes were found. This number places the PNI as the richest Atlantic forest area in number of gall morphotypes. The galls were found on 47 plant families. Among them, Asteraceae were pointed out as the superhost. The gall richness in the lower part of the PNI is higher than that of the plateau. The insect galls were found in 154 native, 56 endemic and only one exotic plant species. Concerning the conservational status, the host plants include two vulnerable species with three morphotypes together. Several new botanical records were reported. Leaves were the most galled plant organ,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Cecidomyiidae; Insect-plant interactions; Multitrophic relations; New records.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200505

Schistosome serine protease inhibitors: parasite defense or homeostasis?
Provedor de dados: 42
Autores: Quezada,Landys A. Lopez; McKerrow,James H.
Serpins are a structurally conserved family of macromolecular inhibitors found in numerous biological systems. The completion and annotation of the genomes of Schistosoma mansoni and Schistosoma japonicum has enabled the identification by phylogenetic analysis of two major serpin clades. S. mansoni shows a greater multiplicity of serpin genes, perhaps reflecting adaptation to infection of a human host. Putative targets of schistosome serpins can be predicted from the sequence of the reactive center loop (RCL). Schistosome serpins may play important roles in both post-translational regulation of schistosome-derived proteases, as well as parasite defense mechanisms against the action of host proteases.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosomiasis; Inhibitor; Protease; Serpin; Genome.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200025

On topological groups with an approximate fixed point property
Provedor de dados: 42
Autores: BARROSO,CLEON S.; MBOMBO,BRICE R.; PESTOV,VLADIMIR G.
Abstract A topological group   G has the Approximate Fixed Point (AFP) property on a bounded convex subset   C of a locally convex space if every continuous affine action of   G on   C admits a net    (  x i ),     x i ∈ C, such that      x i -  g ⁢  x i ⟶ 0 for all    g ∈ G. In this work, we study the relationship between this property and amenability.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amenable groups; Approximate fixed point property; Følner property; Reiter property.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100019

Antifibrotic effects of total or partial application of amniotic membrane in hepatic fibrosis
Provedor de dados: 42
Autores: MAMEDE,KARINA M.; SANT’ANNA,LUCIANA B.
Abstract: Liver fibrosis is the final common pathway of chronic liver diseases, having cirrhosis as a possible progression, which has liver transplantation as the only effective treatment. Human amniotic membrane represents a potential strategy as a therapy for liver fibrosis, due to its anti-inflammatory, anti-fibrotic and immunomodulatory properties. The aim of this study was to evaluate amniotic membrane effects as a treatment for hepatic fibrosis induced in rats by bile duct ligation (BDL), verifying alterations between two different forms of amniotic membrane application, around all the lobes of the liver and around only one lobe of the liver. Two weeks after inducing fibrosis, an amniotic membrane fragment was applied to the surface of the liver,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amniotic membrane; Histopathology; Immunohistochemistry; Liver fibrosis; Myofibroblasts.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500702

Plumbagin quantification in roots of Plumbago scandens L. obtained by different extraction techniques
Provedor de dados: 42
Autores: Paiva,Selma R. de; Lima,Lucilene A.; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
The Plumbago genus belongs to the Plumbaginaceae family and it is known due to its variety of biological uses, most of them attributed to the presence of naphthoquinones. Plumbagin is a naturally occurring naphthoquinone that can be obtained from roots of Plumbago scandens L. In order to find out the better technique for plumbagin extraction, were applied: static maceration, dynamic maceration, with assistance of ultrasonic waves and in Soxhlet apparatus. Four compounds were qualitatively detected in all extracts: the naphthoquinones plumbagin and epi-isoshinanolone, palmitic acid and sitosterol. Plumbagin was always the major component in all analyzed extracts and it was quantitatively determined by gas chromatograph coupled with mass spectrometer....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plumbaginaceae; Plumbago scandens L.; Plumbagin; Extraction techniques.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300004

Soil microbial C:N:P ratio across physiognomies of Brazilian Cerrado Soil microbial biomass across a gradient of preserved native Cerrado
Provedor de dados: 42
Autores: ROCHA,SANDRA M.B.; ANTUNES,JADSON E.L.; ARAUJO,FABIO F. DE; MENDES,LUCAS W.; SOUSA,RICARDO S. DE; ARAUJO,ADEMIR S. F. DE.
Abstract: Different physiognomies across the Cerrado could influence the microbial C:N:P ratio in the soil since these physiognomies present different abundance and diversity of plant species. Thus, the aim of this study was to evaluate the microbial C:N:P ratio in soil across three different physiognomies of Cerrado in the Northeast, Brazil, namely campo graminóide (dominance of grasses), cerrado stricto sensu (dominance of grasses, shrubs, low trees, and woody stratum), and cerradão (dominance of woody stratum). Campo graminóide was characterized by lower values of total organic C, N, microbial C:P, N:P, and soil C:N. Cerrado stricto sensu presented average values for most of the measured parameters, while cerradão presented higher values of microbial C,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass; Soil quality; Organic matter; Tropical soil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700857

Mutations in collagen 18A1 (COL18A1) and their relevance to the human phenotype
Provedor de dados: 42
Autores: Passos-Bueno,Maria Rita; Suzuki,Oscar T.; Armelin-Correa,Lucia M.; Sertié,Andréa L.; Errera,Flavia I.V.; Bagatini,Kelly; Kok,Fernando; Leite,Katia R.M.
Collagen XVIII, a proteoglycan, is a component of basement membranes (BMs). There are three distinct isoforms that differ only by their N-terminal, but with a specific pattern of tissue and developmental expression. Cleavage of its C-terminal produces endostatin, an inhibitor of angiogenesis. In its N-terminal, there is a frizzled motif which seems to be involved in Wnt signaling. Mutations in this gene cause Knobloch syndrome KS), an autosomal recessive disorder characterized by vitreoretinal and macular degeneration and occipital encephalocele. This review discusses the effect of both rare and polymorphic alleles in the human phenotype, showing that deficiency of one of the collagen XVIII isoforms is sufficient to cause KS and that null alleles causing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: COL18A1; Collagen XVIII; Knobloch syndrome; Eye development; Neuronal cell migration; Craniosynostosis; Polymorphisms; D1437N.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100012

Description of fourth instar larva and pupa of Atrichopogon delpontei Cavalieri and Chiossone (Diptera: Ceratopogonidae) from Brazilian Amazonia
Provedor de dados: 42
Autores: MARINO,PABLO I.; SPINELLI,GUSTAVO R.; FERREIRA-KEPPLER,RUTH; RONDEROS,MARÍA M.
ABSTRACT The fourth instar larva and pupa of Atrichopogon delpontei Cavalieri and Chiossone are described for the first time. The immatures were collected from stream margins in the northern Brazilian states Rondônia and Piauí, and subsequently reared to adults. Larvae and pupae are illustrated and photomicrographed. Details on the rearing process and feeding behavior in laboratory, bionomics and notes on habitats are also provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrichopogon delpontei; Immatures; Lophomyidium; Neotropical region; Reared.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502081

Somatic embryogenesis in the commercial papaya hybrid UENF/Caliman 01 relying on plantlet production from sexed adult hermaphrodite donor plants
Provedor de dados: 42
Autores: GOUVEA,DRIELLY S.; CHAGAS,KRISTHIANO; CIPRIANO,JAMILE L.D.; LOPES,JOSÉ CARLOS; SCHMILDT,EDILSON R.; OTONI,WAGNER C.; SCHMILDT,OMAR; ARAUJO,CAROLINE P. DE; ALEXANDRE,RODRIGO S.
Abstract: Somatic embryogenesis from explants from hermaphrodite papaya mother plants is an alternative for the production of true-to-type plants without the need for sexing. This study aimed to analyze hormonal and osmotic inducers in different somatic embryogenesis stages in the commercial hermaphrodite hybrid papaya UENF/Caliman 01. Leaf disks from in vitro shoots originated from ex vitro hermaphrodite plants were cultured in induction medium supplemented with different concentrations of 2,4-D (6, 9, 12, 15, and 18 μM) and 4-CPA (19, 22, 25, 28, and 31 μM). After 90 days, the formation of somatic embryos was verified. The 2,4-D induced the formation of light brown calli with low frequency (20%) of somatic embryogenesis. However, 4-CPA (25 μM) induced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abscisic acid; Auxins; Carica papaya L.; Gibberellic acid; Hermaphrodite explants; Polyethylene glycol.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500856

Non-Hyperbolic Velocity Analysis of Seismic Data from Jequitinhonha Basin, Northeastern Brazil
Provedor de dados: 42
Autores: ORTEGA,FRANCISCO G.; BASSREI,AMIN; GOMES,ELLEN N.S.; OLIVEIRA,ANDREI G. DE.
Abstract  Normal moveout (NMO) velocity is used in seismic data processing to correct the data from the moveout effect. This velocity depends on the medium above the reflector and it is estimated from the adjustment of a hyperbolic function that approximates the reflection time. This approximation is reasonable for media formed by isotropic layers. For deeper exploration targets, which effectively behave as anisotropic media, the NMO velocity estimate from the hyperbolic approximation becomes imprecise. One possibility is the use of non-hyperbolic approximations for the reflection time and deeming the medium to be anisotropic. However, these approximations make the NMO velocity estimation a more complex problem, since the anisotropic parameters are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NMO velocity; Non-hyperbolic reflection time; Anisotropic media.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100606

Achieving the Sustainable Development Goal 06 in Brazil: the universal access to sanitation as a possible mission
Provedor de dados: 42
Autores: DIAS,CINTIA M.M.; ROSA,LUIZ P.; GOMEZ,JOSE M.A.; D’AVIGNON,ALEXANDRE.
ABSTRACT  Sanitation (which includes national public policies for drinking water, sewage services and waste management) is precarious in Brazil and therefore poses a challenge to a range of actors. Poor sanitation impacts public health, education, the environment, and daily life. Globally, it emits increasing greenhouse gases. Universalization of any major public service appears difficult, if not impossible; however, Brazil’s program to universalize access to electricity proves the opposite, as will be shown in this paper. By describing the successful implementation of electricity for everyone, we show that planned public efforts, coordinated with private initiatives and local communities, have worked, and the same can be achieved for the sanitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid Waste (SW); Water; Sewage; Sanitation; Greenhouse gases; Sustainable Development Goals (SDGs).
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401337

Bone turnover markers for early detection of fracture healing disturbances: A review of the scientific literature
Provedor de dados: 42
Autores: Sousa,Cristina P.; Dias,Isabel R.; Lopez-peña,Mónica; Camassa,José A.; Lourenço,Paulo J.; Judas,Fernando M.; Gomes,Manuela E.; Reis,Rui L.
Imaging techniques are the standard method for assessment of fracture healing processes. However, these methods are perhaps not entirely reliable for early detection of complications, the most frequent of these being delayed union and non-union. A prompt diagnosis of such disorders could prevent prolonged patient distress and disability. Efforts should be directed towards the development of new technologies for improving accuracy in diagnosing complications following bone fractures. The variation in the levels of bone turnover markers (BTMs) have been assessed with regard to there ability to predict impaired fracture healing at an early stage, nevertheless the conclusions of some studies are not consensual. In this article the authors have revised the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone formation markers; Bone resorption markers; Delayed union; Fracture healing; Osteoclast regulatory proteins; Non-union process.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201049

Garnets from the Camafuca-Camazambo kimberlite (Angola)
Provedor de dados: 42
Autores: Correia,Eugénio A.; Laiginhas,Fernando A.T.P.
This work presents a geochemical study of a set of garnets, selected by their colors, from the Camafuca-Camazambo kimberlite, located on northeast Angola. Mantle-derived garnets were classified according to the scheme proposed by Grütter et al. (2004) and belong to the G1, G4, G9 and G10 groups. Both sub-calcic (G10) and Ca-saturated (G9) garnets, typical, respectively, of harzburgites and lherzolites, were identified. The solubility limit of knorringite molecule in G10D garnets suggests they have crystallized at a minimum pressure of about 40 to 45 kbar (4-4.5 GPa). The occurrence of diamond stability field garnets (G10D) is a clear indicator of the potential of this kimberlite for diamond. The chemistry of the garnets suggests that the source for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kimberlite; Diamond; Garnet; Lherzolite; Harzburgite.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200010

The gastroprotective effect of Memora nodosa roots against experimental gastric ulcer in mice
Provedor de dados: 42
Autores: SILVA,DAYANE M.; MARTINS,JOSÉ L.R.; FLORENTINO,IZIARA F.; OLIVEIRA,DANILLO R.; FAJEMIROYE,JAMES O.; TRESNVENZOL,LEONICE M.F.; PAULA,JOSÉ R.; COSTA,ELSON A.
ABSTRACT Memora nodosa is popularly known as "caroba" and widely found in the Cerrado regions of Brazil. In traditional medicine, the leaves and stems are used for the healing of external ulcer and the roots for abdominal pain. This study investigated the effect of ethanolic roots extract of Memora nodosa (EMN) on the gastric mucosa of mice. In the indomethacin induced gastric ulcer model, the treatments of the animals with EMN at doses of 100, 300 and 1000 mg/kg, p.o., markedly reduced the index of lesions. In the gastric ulcer models induced by ethanol and cold restraint-stress the previous treatment with EMN at dose of 300 mg/kg showed 69% and 43% of protection, respectively. Seven days after food-restriction, the animals treated with EMN (300 mg/kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gastric lesion; Gastroprotection; Medicinal plants; Memora nodosa; Mucus; Traditional medicine.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501819

A new species and new records of Leptogium (Ach.) Gray (Collemataceae, Peltigerales) from Rio Grande do Sul State with an identification key for the genus
Provedor de dados: 42
Autores: KITAURA,MARCOS J.; KOCH,NATÁLIA M.; LUCHETA,FABIANE; KÄFFER,MÁRCIA I.; SCHMITT,JAIRO L.; PEDROSO,JULIANA; MARTINS,SUZANA A.; RODRIGUES,ANDRESSA S.; CANÊZ,LUCIANA S.
Abstract Abstract: Specimens of Leptogium collected in ten localities from the State of Rio Grande do Sul were studied. Sixteen species were found of 28 records mentioned to the state, which represents around 57% of the Leptogium diversity known for Rio Grande do Sul. Leptogium exaratum is proposed as a new species. Leptogium atlanticum, L. milligranum and L. vesiculosum are reported for the first time to the state. The lectotype of L. javanicum is reported here and detailed descriptions are provided to the examined specimens. An identification key is showed with all the 28 mentioned species of Leptogium. It is the first published taxonomic key for Leptogium from Rio Grande do Sul, the State with the highest diversity of this genus in Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Checklist; Diversity; HAS herbarium; HURG herbarium; Inflated apothecia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100607

Evaluation of Gastro-protective Activity of Myristica fragrans on Ethanol-induced Ulcer in Albino Rats
Provedor de dados: 42
Autores: SATTAR,ARRANSA; ABDO,ABDULLAH; MUSHTAQ,MUHAMMAD N.; ANJUM,IRFAN; ANJUM,AHSAN.
Abstract: Myristica fragrans seeds are traditionally used to treat dyspepsia, vomiting and abdominal pain. The purpose of this study was to investigate the protective effect of Myristica fragrans in ethanol induced gastric ulcer. Study was carried out on rats, divided into four groups; negative control, positive control, standard drug control, and Myristica fragrans extract treated rats. The pH, ulcer index, acidity values and histopathological examination of stomach were evaluated. Myristica fragrans significantly (P&lt;0.05) reduced gastric lesions by 41.68% in ethanol induced ulcer model at 200 mg/kg when compared to sucralfate (60.41%). However, histopathological findings appeared similar in Myristica fragrans extract treated and standard drug control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myristica fragrans; Gastro-protective activity; Ulcer; Ulcer index.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300707

Reproductive biology of Echinometra lucunter (Echinodermata: Echinoidea) in a northeast Brazilian sandstone reef
Provedor de dados: 42
Autores: Lima,Eduardo J.B.; Gomes,Paula B.; Souza,José R.B.
The edible sea urchin Echinometra lucunter (Linnaeus, 1758) is a very common species on the sublittoral-midlittoral in Brazilian rocky shores. The aim of this work was to describe the gametogenesis and reproductive strategy of the E. lucunter population at Muro Alto beach in the Northeast coast of Brazil from August 2004 to August 2005. A total of 240 specimens were collected on the sandstone reef flat from a tidepool during spring low tides. The overall sex ratio was1.12:1,withoutsignificanttemporalvariationexceptinOctober2004. Firsts sexual maturity ocurred in individuals from a diameter of 20.8 mm. There was not a significant difference in gonad index between females and males during the sampling period. The female's gonad index variation was associated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beach rock; Brazil; Echinodermata; Reproduction; Sea urchin.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100007

Cytotoxic sesquiterpene lactones from the aerial parts of Inula aucheriana.
Provedor de dados: 42
Autores: Gohari,Ahmad Reza; Mosaddegh,Mahmoud; Naghibi,Farzaneh; Eslami-Tehrani,Bahara; Pirani,Atefeh; Hamzeloo-Moghadam,Maryam; Read,Roger W.
Inula aucheriana DC is a member of the family Asteraceae which is known to produce cytotoxic secondary metabolites noted as sesquiterpene lactones. In the present study, sesquiterpene lactones inuchinenolide B, 6-deoxychamissonolide (stevin) and 14-acetoxy-1β,5α,7αH-4β-hydroxy-guai-9(10),11(13)-dien-12,8α-olide were isolated from I. aucheriana. Inuchinenolide B and 14-acetoxy-1β,5α,7αH-4β-hydroxy-guai-9(10),11(13)-dien-12,8α-olide were further evaluated by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay to demonstrate cytotoxic activity with IC50 values of (56.6, 19.0), (39.0, 11.8), and (55.7, 15.3) μg/mL against HepG-2, MCF-7 and A-549 cells, respectively. The cytotoxic activity of the two evaluated sesquiterpene lactones...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotoxicity; Inula aucheriana; MTT assay; Sesquiterpene lactones.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200777

Vegetation and hydrology changes in Eastern Amazonia inferred from a pollen record
Provedor de dados: 42
Autores: Toledo,Mauro B. de; Bush,Mark B.
Pollen, charcoal, and C14 analyses were performed on a sediment core obtained from Lake Tapera (Amapá) to provide the palaeoenvironmental history of this part of Amazonia. A multivariate analysis technique, Detrended Correspondence Analysis, was applied to the pollen data to improve visualization of sample distribution and similarity. A sedimentary hiatus lasting 5,500 years was identified in the Lake Tapera. Because the timing of the hiatus overlapped with the highest Holocene sea-level, which would have increased the local water table preventing the lake from drying out, it is clear that sea-level was not important in maintaining the lake level. Lake Tapera probably depended on riverine flood waters, and the sedimentary gap was caused by reduced Amazon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetation change; Hydrology change; Amazonia; Pollen record; Climate change.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100014

The central role of RNA in the genetic programming of complex organisms
Provedor de dados: 42
Autores: Mattick,John S.
Notwithstanding lineage-specific variations, the number and type of protein-coding genes remain relatively static across the animal kingdom. By contrast there has been a massive expansion in the extent of genomic non-proteincoding sequences with increasing developmental complexity. These non-coding sequences are, in fact, transcribed in a regulated manner to produce large numbers of large and small non-protein-coding RNAs that control gene expression at many levels including chromatin architecture, post-transcriptional processing and translation. Moreover, many RNAs are edited, especially in the nervous system, which may be the basis of epigenome-environment interactions and the function of the brain.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Development; Noncoding RNA; Epigenome; Gene regulation; RNA editing; Brain.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400016

Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region
Provedor de dados: 42
Autores: MENESES,MARIA ECILENE N.S.; COSTA,MARCONDES L.; ENTERS,DIRK; BEHLING,HERMANN.
ABSTRACTThe environmental changes and the dynamics of the savanna-forest mosaic, over the last 1050 years, have been reconstructed by pollen, charcoal, radiocarbon dating mineralogical and geochemical analyses of sediment cores taken from three different Mauritia flexuosapalm swamps in the northernmost part of the Brazilian Amazon region (northern state of Roraima). Studies on the relationship between the modern pollen rain and the regional vegetation provide additional information for the interpretation of the fossil pollen records. The fossil pollen assemblages and geochemical results indicate relatively wet climatic conditions throughout the recorded period. Despite these moist conditions, fires were frequent and are one of the reasons for the dominance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fire frequency; Late Holocene; Roraima state-Brazil; Vegetation dynamic.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401623

Richness and structure of ant assemblies (Hymenoptera: Formicidae) in Atlantic forest in southern Brazil
Provedor de dados: 42
Autores: LUTINSKI,JUNIR A.; LUTINSKI,CLADIS J.; GUARDA,CARIN; BUSATO,MARIA A.; GARCIA,FLÁVIO R.M.
ABSTRACT Ant diversity is influenced by the structural complexity of the environment. Ants are thus an ecologically important group due to their potential to serve as indicators of environmental quality. The objective of this study was to evaluate ant diversity in areas with different land use histories and thus, within different stages of regeneration in the Permanent Preservation Area of the Foz do Chapecó Hydroelectric Plant reservoir. Ant assemblies among sample sites were compared using rarefaction analysis, and estimated richness, frequency of occurrence, and relative abundance were calculated. Associations between species and sample sites were evaluated using Principal Component Analysis (PCA). We identified 55 species in total from 24 genera,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ant fauna; Hydroelectric plant; Permanent Preservation Areas; Richness; Ants.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602719

Identification of Listeria monocytogenes in cattle meat using biochemical methods and amplification of the hemolysin gene
Provedor de dados: 42
Autores: SILVA,ALESSANDRA S.; DUARTE,ELIZABETH A.A.; OLIVEIRA,THIAGO A.S. DE; EVANGELISTA-BARRETO,NORMA S.
Abstract  In Brazil and in other countries of the world, studies have been conducted to identify Listeria monocytogenes in cattle meat that is preferably consumed undercooked and, when marketed without meeting strict phytosanitary requirements, may cause outbreaks of listeriosis. In the such, foodborne outbreaks, the methods used for the detection of the pathogen and the efficiency associated with them are crucial for the proper assessment. In this study, we used the techniques biochemical and molecular for identification of the L. monocytogenes isolated from 30 samples of the fresh beef, marketed in ten butchers’ shop of the free-fair from a municipality from the Bahia, Brazil. The results obtained from biochemical tests (catalase, motility, β-hemolysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foodborne diseases; Listeriosis; Meat products; Hly A gene.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201004

Geochemistry and petrogenesis of post-collisional ultrapotassic syenites and granites from southernmost Brazil: the Piquiri Syenite Massif
Provedor de dados: 42
Autores: Nardi,Lauro V.S.; Plá-Cid,Jorge; Bitencourt,Maria de Fátima; Stabel,Larissa Z.
The Piquiri Syenite Massif, southernmost Brazil, is part of the post-collisional magmatism related to the Neoproterozoic Brasiliano-Pan-African Orogenic Cycle. The massif is about 12 km in diameter and is composed of syenites, granites, monzonitic rocks and lamprophyres. Diopside-phlogopite, diopside-biotite-augite-calcic-amphibole, are the main ferro-magnesian paragenesis in the syenitic rocks. Syenitic and granitic rocks are co-magmatic and related to an ultrapotassic, silica-saturated magmatism. Their trace element patterns indicate a probable mantle source modified by previous, subduction-related metasomatism. The ultrapotassic granites of this massif were produced by fractional crystallization of syenitic magmas, and may be considered as a particular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Post-collisional magmatism; Ultrapotassic syenites; Ultrapotassic granites; A-type magmatism; Piquiri Syenite Massif.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200014

Screening for FMR1 expanded alleles in patients with Autism Spectrum Disorders in Manaus, Northern Brazil
Provedor de dados: 42
Autores: FERREIRA,JORGE F.B.; BATISTA,JACQUELINE S.; FANTIN,CLEITON.
Abstract: Fragile X Syndrome (FXS) is a neurodevelopmental disorder caused by dynamic mutations of a CGG repetition segment in an X chromosome’s single gene. It is considered the leading hereditary cause of both Autism Spectrum Disorders and Intellectual Disability. Some authors suggest that all individuals diagnosed with some of these latter conditions to be clinically and molecularly trialled for FXS due to the high levels of comorbidity between both conditions and also due to the variable expressiveness of this syndrome. This study has focused on verifying the presence of FMR1 expanded alleles since there is a lack of information about this kind of mutation in autism patients from the northern region of Brazil. The presence of large alleles for this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autism spectrum disorders; Dynamic mutation; Fragile X syndrome; Molecular screening; Premutation; Trinucleotide repeats.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500805

The Neostratotype of Itapecuru Formation (Lower-Middle Albian) and Its Impact for Mesozoic Stratigraphy of Parnaíba Basin
Provedor de dados: 42
Autores: CORRÊA-MARTINS,FRANCISCO J.
Abstract Abstract: This study defines the neostratotype of the Lower-Middle Albian Itapecuru Formation in the Parnaíba Basin, Northeast Brazil. In this sedimentary succession along the right bank of the Itapecuru River near the Itapecuru-Mirim City, Maranhão State, three lithofacies associations are recognized. The first is silty claystone with some very fine sand, micaceous, reddish color, thin laminated, showing a tabular aspect, interpreted as floodplain fines in a distal position. The second is clayey siltstone, reddish color, with ripple cross-lamination, very thin cross-laminated wacke lenses, grading to thin parallel lamination, in apparently tabular layers, interpreted as crevasse splay and distributive channels deposits in successive avulsion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itapecuru Formation; Lithofacies; Mudrocks; Neostratotype; Mesozoic Stratigraphy; Parnaíba Basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400509

Monoclonal antibody specific to glucosylceramide found in pathogenic fungi
Provedor de dados: 42
Autores: Toledo,MS; Suzuki,E; Levery,SB; Straus,AH; Takahashi,HK.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100019

Qualitative characteristics of meat from cull cows of different genotypes and age class slaughter under different finishing systems: a meta-analytic approach
Provedor de dados: 42
Autores: Pacheco,Rangel F.; Mayer,Andrei R.; Vaz,Marcos A.B.; Pötter,Luciana; Cattelam,Jonatas; Callegaro,Álisson M.; Pizzuti,Luiz Angelo D.; Brondani,Ivan L.; Alves Filho,Dari C.; Pacheco,Paulo S.
The aim of this study was to evaluate, by meta-analysis, the quality of the meat of the cows according to genotype, termination system and age class slaughter. During an online research were identified 15 articles with information related to meat quality of slaughtered cows. The data were grouped according of the genotype of cows being: zebu or continental defined, crossed zebu x british or zebu x continental; according to termination system: feedlot or grassland; according to age of slaughter, where: up to 4 years old (young), 4-8 years old (adult) or more than 8 years old (old). The meat of the continental crossbred cows was softer than the other genotypes, both panel of evaluators and by Shear. The meat of cows finished in feedlot showed higher marbling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Confinement; Female cattle; Softness; Crossbred; Shear; Zebu.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201083

Efficiency of snake sampling methods in the Brazilian semiarid region
Provedor de dados: 42
Autores: Mesquita,Paulo C.M.D.; Passos,Daniel C.; Cechin,Sonia Z.
The choice of sampling methods is a crucial step in every field survey in herpetology. In countries where time and financial support are limited, the choice of the methods is critical. The methods used to sample snakes often lack objective criteria, and the traditional methods have apparently been more important when making the choice. Consequently researches using not-standardized methods are frequently found in the literature. We have compared four commonly used methods for sampling snake assemblages in a semiarid area in Brazil. We compared the efficacy of each method based on the cost-benefit regarding the number of individuals and species captured, time, and financial investment. We found that pitfall traps were the less effective method in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Comparison; Pitfall traps; Squamata; Techniques.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301127

Evaluation in vivo of biocompatibility of differents resin-modified cements for bonding orthodontic bands
Provedor de dados: 42
Autores: MESQUITA,JANAINA A.; LACERDA-SANTOS,ROGÉRIO; SAMPAIO,GÊISA A.M.; GODOY,GUSTAVO P.; NONAKA,CASSIANO F.W.; ALVES,POLLIANNA M.
ABSTRACT The focus of this study was to test the hypothesis that there would be no difference between the biocompatibility of resin-modified glass ionomer cements. Sixty male Wistar rats were selected and divided into four groups: Control Group; Crosslink Group; RMO Group and Transbond Group. The materials were inserted into rat subcutaneous tissue. After time intervals of 7, 15 and 30 days morphological analyses were performed. The histological parameters assessed were: inflammatory infiltrate intensity; reaction of multinucleated giant cells; edema; necrosis; granulation reaction; young fibroblasts and collagenization. The results obtained were statistically analyzed by the Kruskal-Wallis and Dunn test (P&lt;0.05). After 7 days, Groups RMO and Transbond...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dental materials; Orthodontic cements; Biocompatibility test; Inflammation; Multinucleated giant cells.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502433

Radiopharmaceuticals drug interactions: a critical review
Provedor de dados: 42
Autores: Santos-Oliveira,Ralph; Smith,Sheila W.; Carneiro-Leão,Ana Maria A.
Radiopharmaceuticals play a critical role in modern medicine primarily for diagnostic purposes, but also for monitoring disease progression and response to treatment. As the use of image has been increased, so has the use of prescription medications. These trends increase the risk of interactions between medications and radiopharmaceuticals. These interactions which have an impact on image by competing with the radiopharmaceutical for binding sites for example can lead to false negative results. Drugs that accelerate the metabolism of the radiopharmaceutical can have a positive impact (i.e. speeding its clearance) or, if repeating image is needed, a negative impact. In some cases, for example in cardiac image among patients taking doxirubacin, these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiopharmaceuticals; Radiopharmacy; Drug interaction; Systematic review.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400008

A polysaccharide fraction extracted from Pleurotus ostreatus mycelial biomass inhibit Sarcoma 180 tumor
Provedor de dados: 42
Autores: WISBECK,ELISABETH; FACCHINI,JEAN M.; ALVES,ENDI P.; SILVEIRA,MARCIA L.L.; GERN,REGINA M.M.; NINOW,JORGE L.; FURLAN,SANDRA A.
ABSTRACT Fungi of Pleurotus genus have attracted a great interest due to their medicinal properties such as anti-inflammatory, antimicrobial and antitumor. These properties are attributed mainly to polysaccharides synthesized by Pleurotus. This work aimed to study the mycelial growth of P. ostreatus in submerged culture, evaluating the influence of the initial concentration of substrate (20 and 40 g/L of glucose) and the pH (4 and 6) on kinetic parameters of production of biomass. The effectiveness of different doses (10, 30 and 50 mg/kg) of a mycelium polysaccharide fraction extracted from P. ostreatus in reducing Sarcoma 180 development in mice was also verified. In the range of this study, maximum concentration of mycelial biomass (about 12.8 g/L) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumor Activity; Mycelium; Pleurotus ostreatus; Polysaccharides; Sarcoma 180.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502013

Geometry and kinematics of experimental antiformal stacks
Provedor de dados: 42
Autores: GOMES,CAROLINE JANETTE SOUZA; FERREIRA,JULIANO EFIGÊNIO.
Sandbox experiments with different boundary conditions demonstrate that antiformal stacks result from a forward-breaking thrust sequence. An obstacle blocks forward thrust propagation and transfers the deformation back to the hinterland in a previously formed true duplex. In the hinterland, continued shortening causes faults to merge toward the tectonic transport direction until the older thrusts override the younger thrusts. In experiments using thin sand layers or high basal friction, shortening is accommodated by a cyclic process of thrusting, back rotation of the newly formed thrust combined with strong vertical strain, and nucleation of a new thrust. Continuous deformation produces an antiformal stack through progressive convergence of branch lines.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Basement structures; Slightly dipping basal detachment; Sand layer thickness; Basal friction.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200008

Naming structures and qualifying properties of anuran bioacoustical signals: a call for a homology-based nomenclature and equality for quantitative data
Provedor de dados: 42
Autores: HEPP,FÁBIO; POMBAL JR,JOSÉ P.
Abstract: There is a significant interest for using call features in taxonomic and systematic studies. However, the indiscriminate use of alternative terms for the acoustic structures has precluded reliable comparisons among species without directly checking recordings of all compared species. Recent attempts of nomenclature standardization have focused on term and structure definitions instead of homology. Here, we argue that application of nomenclatural propositions based on universal similarities is pragmatically difficult (likely impossible) and, most importantly, inaccurate regarding to assessment of homology. If homology is not properly assessed, nomenclature can lead to artificial groupings, which can hamper our understanding of the natural world....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Bioacoustics; Comparative biology; Systematics; Terminology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700612

Transfer cells in trichomatous nectary in Adenocalymma magnificum (Bignoniaceae)
Provedor de dados: 42
Autores: GAMA,THÁLIA S.S.; AGUIAR-DIAS,ANA CRISTINA A. DE; DEMARCO,DIEGO.
ABSTRACT Transfer cells are specialized cells that play an important role where there are high energy costs due to facilitation of transmembrane flow of solutes. This study aimed to investigate the ontogenesis, histochemistry and ultrastructure of glandular trichomes focusing on stalk cells and their possible transfer function. Samples of prophylls of axillary buds, calyces of flowers in anthesis, and flower buds in different stages of development were collected, fixed and processed according to the common methods of microscopy. The glandular trichomes are composed of a secretory head with its cells in columnar format. The stalk is formed by two layers of cells, with the upper layer composed of cuboidal cells where the wall starts to thicken at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glandular trichomes; Nectaries; Ontogenesis; Secretory structures; Wall ingrowths.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200527

Efficiency of boron application in an Oxisol cultivated with banana in the Central Amazon
Provedor de dados: 42
Autores: Moreira,Adônis; Castro,César de; Fageria,Nand K.
In the Amazon region, there is no information on the fertilization of banana plants with boron (B). Besides this, the extractant (hot water) currently used to test B concentrations has many limitations. The aim of this work was to study the effect of B on the fruit yield and quality of banana plants of the Cavendish (AAA) sub-group, grown in dystrophic Yellow Latosol (Oxisol or Xanthic Ferralsol), in the Amazonas State, Brazil. The experimental design was completely randomized split plot in a 4 x 2 factorial scheme, composed of four B rates (0, 4, 8 and 12 kg ha-1) and two harvest cycles (sub-treatments), with four replicates. The B availability in the soil was determined by three extractants: Mehlich 3, hot water and KCl 1.0 mol L-1. The application of B...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Yield; Methods of soil analysis; Post-harvest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400030

Simulated self-organization of death by inherited mutations
Provedor de dados: 42
Autores: Martins,Jorge S. Sá; Stauffer,Dietrich; Oliveira,Paulo M.C. de; Oliveira,Suzana Moss de.
An agent-based computer simulation of death by inheritable mutations in a changing environment shows a maximal population, or avoids extinction, at some intermediate mutation rate of the individuals. Our results indicate that death seems needed to allow for evolution of the fittest, as required by a changing environment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Changing environment; Computer modeling; Evolution; Mutation; Selection.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400010

Methodological parameters for the identification and taxonomic classification of isolated theropodomorph teeth
Provedor de dados: 42
Autores: FRANCO-ROSAS,ALDIRENE C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200022

A contribution to the identification of charcoal origin in Brazil II - Macroscopic characterization of Cerrado species
Provedor de dados: 42
Autores: GONÇALVES,THAÍS A.P.; NISGOSKI,SILVANA; OLIVEIRA,JULIA S.; MARCATI,CARMEN R.; BALLARIN,ADRIANO W.; MUÑIZ,GRACIELA I.B.
The Brazilian Cerrado is the richest savanna in the world. It is also one of the biomes more threatened in the country and a hotspot for conservation priorities. The main causes of deforestation in Cerrado are agricultural practices, livestock and charcoal production. Although charcoal has a minor impact, its consumption represents the deforestation of 16.000 Km² of the Cerrado. To contribute for the biomes's conservation it is very important to improve forestry supervision. Thus, in this work we present the macroscopic characterization of charcoal from 25 Cerrado's species. We simulate the real conditions of forest controllers by using the magnifications of 10x, 25x and 65x. Likewise, the charcoals micrographs are all of transverse sections due to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charcoal anatomy; Nature conservancy; Forest control; Native species.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301045

Molluscicidal activity of 2-hydroxy-[1,4]naphthoquinone and derivatives
Provedor de dados: 42
Autores: Camara,Celso A.; Silva,Tania M.S.; da-Silva,Thiago G.; Martins,Rodrigo M.; Barbosa,Ticiano P.; Pinto,Angelo C.; Vargas,Maria D.
The toxic profile of lawsone (2-hydroxy-[1,4]naphthoquinone) and a series of [1,4]naphthoquinone derivatives was evaluated against the brine shrimp Artemia salina and against the mollusk Biomphalaria glabrata, the main transmitting vector of schistosomiasis in Brazil. Of the seventeen compounds tested nine fell below the threshold of 100 µg/mL set for potential molluscicidal activity by the World Health Organization. As a general rule derivatives with non-polar substituents presented the highest molluscicidal activities. These substances showed significant toxicity in A. salina lethality bioassay.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomphalaria glabrata Artemia salina toxicity quinones schistosomiasis molluscicidal activity lawsone 1; 4-naphthoquinone.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200011

Hormesis with glyphosate depends on coffee growth stage
Provedor de dados: 42
Autores: CARVALHO,LEONARDO B. DE; ALVES,PEDRO L.C.A.; DUKE,STEPHEN O.
Weed management systems in almost all Brazilian coffee plantations allow herbicide spray to drift on crop plants. In order to evaluate if there is any effect of the most commonly used herbicide in coffee production, glyphosate, on coffee plants, a range of glyphosate doses were applied directly on coffee plants at two distinct plant growth stages. Although growth of both young and old plants was reduced at higher glyphosate doses, low doses caused no effects on growth characteristics of young plants and stimulated growth of older plants. Therefore, hormesis with glyphosate is dependent on coffee plant growth stage at the time of herbicide application.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Weed management; Herbicide; Spray drift; Stimulatory effect.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200813

Novelties in secretory structures and anatomy of Rhynchosia(Fabaceae)
Provedor de dados: 42
Autores: VARGAS,WANDERLEIA DE; SARTORI,ÂNGELA L.B.; DIAS,EDNA S.
A comparative anatomical study was carried out on the secretory structures of leaflets from taxa belonging to the genus Rhynchosia - taxa difficult to delimit because of uncertain interspecific relations - in order to evaluate the potential diagnostic value of these anatomical traits for taxonomic assignment. A further objective was to establish consensual denomination for these secretory structures. The new anatomical features found in these taxa were sufficiently consistent to separate the species evaluated. The presence and localization of glandular-punctate structures bulbous-based trichomes, the number of layers in the palisade parenchyma and the arrangement of vascular units distinguish the taxa investigated and these characteristics can be extended...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaflets; Legume; Taxonomy; Trichomes.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100083

Assessment of the occurrence and richness of arbuscular mycorrhizal fungal spores by direct analysis of field samples and trap culture - a comparative study
Provedor de dados: 42
Autores: LEAL,PATRÍCIA L.; CARVALHO,TEOTONIO S. DE; SIQUEIRA,JOSÉ OSWALDO; MOREIRA,FATIMA M.S.
ABSTRACT In this work, we hypothesized that two spore-based methods, direct analysis of field samples and trap cultures, simultaneously used for assessment of occurrence and species richness of arbuscular mycorrhizal fungi (AMF) may vary in their efficiency according to the environmental conditions and the total AMF species richness of the evaluated ecosystem. The performance of both methods was analyzed based on two datasets: 1) a complete site x species matrix compiled from two studies in different land uses in the Amazon using direct analysis of field samples and trap cultures. 2) Total number of AMF morphotypes detected by both methods in published manuscripts across several ecosystems. From dataset 1, direct analysis of field samples revealed 57...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha and beta diversity; Diversity assessment methods; Glomeromycota; Spore counts; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502359

Subducted continental crust: metamorphic control of decompression in the hind portion of the Aiuruoca-Andrelândia nappe, south-southwest border of São Francisco Craton, Minas Gerais
Provedor de dados: 42
Autores: SANTOS,LUCIANA P.; CAMPOS NETO,MARIO C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300031

Genetic diversity and structuring in the arapaima (Osteoglossiformes, Osteoglossidae) population reveal differences between the Amazon and the Tocantins-Araguaia basins
Provedor de dados: 42
Autores: Nogueira,Fabrícia; Rêgo,Péricles S. do; Queiroz,Helder; Venere,Paulo; Varela,Eduardo S.; Sampaio,Iracilda; Schneider,Horacio; Araripe,Juliana.
Abstract  Arapaima is a widely-distributed fish of enormous economic importance in the Amazon region. In the present study, a total of 232 specimens were sampled, 121 from five sites in the Amazon basin and 111 from five sites in the Tocantins-Araguaia basin. The analyses investigated fragments of the Cytochrome b, Control Region, Cytochrome Oxidase I, NADH dehydrogenase subunit 2 and seven loci microsatellites. The analyses revealed the existence of two mitochondrial lineages within the general area, with no haplotypes shared between basins, and genetic variability significantly higher in the Amazon than in the Tocantins-Araguaia basin. Two divergent, but sympatric mitochondrial lineages were found in the Amazon basin, but only a single lineage in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Basin; Tocantins-Araguaia Basin; Lineages; Structure population; Conservation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100703

Whole blood transfusion in small animals: indications and effects
Provedor de dados: 42
Autores: Godinho-Cunha,Luís F; Ferreira,Rui M. R. F; Silvestre-Ferreira,Ana C.
Transfusion therapy is a major resource that can improve the patient's capability to overcome the underlying disease. However, the effects of whole blood infusion, and how they affect the patient's outcome, are not yet clear. For this study, a protocol was developed in order to monitor a group of 15 animals (9 dogs, 6 cats) that received a total of 19 transfusions; 3 animals received more than one transfusion each. The most common indications for blood transfusion included acute blood loss (47%), coagulopathy (33%) and other anaemias (20%). The mean pre-transfusion packed cell volume (PCV) of animals with acute blood loss (18%) was higher than in the group of coagulopathy (15%) or other anaemias (15%). The survival rates at 6 days after transfusion were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transfusion effects; Hemotherapy; Whole blood; Blood transfusion.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200020

Chemical composition of gahnite and degree of pegmatitic fractionation in the Borborema Pegmatitic Province, northeastern Brazil
Provedor de dados: 42
Autores: Soares,Dwight R.; Beurlen,Hartmut; Ferreira,Ana C.M.; da-Silva,Marcelo R.R.
Gahnite electron probe microanalyses from three pegmatites (Mirador, Capoeira and Quintos) of the Borborema Pegmatitic Province in northeastern Brazil allowed to determine molar compositions ranging from 86.22 to 95.41 mol% gahnite (ZnAl2O4), 1.51 to 6.62 mol% hercynite (Fe2+Al2O4), 0.11 to 5.89 mol% spinel (MgAl2O4), 1.48 to 2.74 mol% galaxite (MnAl2O4), and Zn/FeTotal atomic ratios ranging from 11.53 to 60.87. These data compared with gahnite compositions from albite subtype pegmatites from Cap de Creus, Spain (Zn/FeTotal between 10 and 60) and from the source granite of the Separation Rapids pegmatite field, Ontario, Canada (Zn/FeTotal =3.5) indicate a high degree of fractionation of the studied pegmatites. This interpretation agrees with conclusions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gahnite; Rare-element granitic pegmatites; Borborema Pegmatitic Province; Mineral chemistry.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300005

Annual, seasonal and spatial abundance of the seabob shrimp Xiphopenaeus kroyeri (Decapoda, Penaeidae) off the Southeastern coast of Brazil
Provedor de dados: 42
Autores: HECKLER,GISELE S.; LOPES,MATEUS; SIMÕES,SABRINA M.; SHIMIZU,ROBERTO M.; COSTA,ROGERIO C. DA.
We investigated the influence of environmental factors in spatial and temporal distribution of the seabob shrimp Xiphopenaeus kroyeri in Santos Bay and São Vicente Estuary, state of São Paulo, Brazil. Monthly samples were obtained, from May 2008 through April 2010, from four locations in the estuary and four in the bay. No individual was collected in the estuary and this was attributed to the low salinity means recorded in this environment. We collected 109,153 individuals in the bay and there was no difference in abundance between the two years comprised by the study period. The similarity in spatial distribution can be related to sediment grain size that in all sampling locations showed great amount of very fine sand. The largest amount of reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Environmental factors; Estuary; Santos Bay.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301337

Stereological tools in biomedical research
Provedor de dados: 42
Autores: Mandarim-de-Lacerda,Carlos A.
Stereological studies are more and more frequent in literature, particularly in the development/evolution, pathology, and neurosciences areas. The stereology challenge is to understand the structural inner threedimensional arrangement based on the analysis of the structure slices only showing two-dimensional information. Cavalieri and Scherle's methods to estimate volume, and Buffon's needle problem, are commented in the stereological context. A group of actions is needed to appropriately quantify morphological structures (unbiased and reproducibly), e.g. sampling, isotropic and uniform randomly sections (Delesse's principle), and updated stereological tools (disector, fractionator, nucleator, etc). Through the correct stereology use, a quantitative study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometry; Stereology; Volume density; Surface density; Length density; Disector; Fractionator.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400006

Generalized quasi-Banach sequence spaces and measures of noncompactness
Provedor de dados: 42
Autores: SILVA,EDUARDO B.; FERNANDEZ,DIOCESAR L.; NIKOLOVA,LUDMILA.
Given 0 &lt; s ≤ 1 and ψ an s-convex function, s – ψ -sequence spaces are introduced. Several quasi-Banach sequence spaces are thus characterized as a particular case of s – ψ -spaces. For these spaces, new measures of noncompactness are also defined, related to the Hausdorff measure of noncompactness. As an application, compact sets in s – ψ -interpolation spaces of a quasi-Banach couple are studied.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Quasi-Banach spaces; Quasi-convex functions; Measures of noncompactness; Interpolation theory.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200443

The anti-inflammatory activity of standard aqueous stem bark extract of Mangifera indica L. as evident in inhibition of Group IA sPLA2
Provedor de dados: 42
Autores: DHANANJAYA,BHADRAPURA LAKKAPPA; SHIVALINGAIAH,SUDHARSHAN.
ABSTRACT The standard aqueous stem bark extract is consumed as herbal drink and used in the pharmaceutical formulations to treat patients suffering from various disease conditions in Cuba. This study was carried out to evaluate the modulatory effect of standard aqueous bark extract of M. indica on Group IA sPLA2. M. indica extract, dose dependently inhibited the GIA sPLA2 (NN-XIa-PLA2) activity with an IC50 value 8.1 µg/ml. M. indica extract effectively inhibited the indirect hemolytic activity up to 98% at ~40 µg/ml concentration and at various concentrations (0-50 µg/ml), it dose dependently inhibited the edema formation. When examined as a function of increased substrate and calcium concentration, there was no relieve of inhibitory effect on the GIA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secretory phospholipase A2; Anti-inflammatory; Pro-inflammatory; Inhibition; Drug; Plants.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100197

Endothelial, renal and hepatic variables in wistar rats treated with Vancomycin
Provedor de dados: 42
Autores: BRUNIERA,FELIPE R.; FERREIRA,FELIPE M.; SAVIOLI,LUIZ R.M.; BACCI,MARCELO R.; FEDER,DAVID; PEREIRA,EDIMAR C.; PEDREIRA,MAVILDE L.G.; PETERLINI,MARIA A.S.; PERAZZO,FÁBIO F.; AZZALIS,LIGIA A.; ROSA,PAULO C.P.; JUNQUEIRA,VIRGINIA B.C.; SATO,MONICA A.; FONSECA,FERNANDO L.A.
Vancomycin (VCM) is indicated in combat against Gram-positive infections, but it is not considered a first-choice drug because of its adverse effects. It is believed that oxidative stress is the primary mechanism of endothelial injury and the consequent VCM toxicity, which varies from phlebitis to nephrotoxicity. Moreover, dose recommendations, dilution, rates and types of infusion are still controversial. The aim of this study was to determine the effect of different VCM dilutions in endothelial, liver and kidney injuries by biochemical parameters and histopathological analysis. Wistar rats were randomly divided into six groups and subjected to femoral vein cannulation for drug administration. Control groups received 0.9 ml of saline and the others...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vancomycin; Acute kidney injury; Oxidative stress; Hepatotoxicity; Endothelial injury.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401963

delta13C fluctuations in precambrian to cambrian carbonate sequences in NE Brazil and NW Argentina
Provedor de dados: 42
Autores: Sial,Alcides N.; Ferreira,Valderez P.; Toselli,Alejandro J.; Aceñolaza,Florencio G.; Alonso,Ricardo; Parada,Miguel A.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400022

Characterization of the cGMP-dependent protein kinase SmcGK1 of Schistosoma mansoni
Provedor de dados: 42
Autores: Leutner,Silke; Beckmann,Svenja; Grevelding,Christoph G.
Schistosomes are trematode parasites and of worldwide medical importance for humans and animals. Growth and development of these parasites require a specific host environment, but also permanent communication processes between the two genders. Accumulating molecular evidence indicates that the responsible interactions are mediated by signal transduction processes. Conserved signaling molecules were identified, and first approaches made for their characterization. However, no representative of the conserved family of cGMP-dependent protein kinases (cGKs) has been described in this parasite yet. Within the Schistosoma mansoni genome data-set we identified cGK homologs, of which one was investigated in more detail in this study. We present the cloning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Signal transduction; CGMP-dependent protein kinases (cGKs); Serine/threonine (S/T) kinases; Gonad development.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200023

Simulations of tropical rainforest albedo: is canopy wetness important?
Provedor de dados: 42
Autores: Yanagi,Silvia N.M.; Costa,Marcos H.
Accurate information on surface albedo is essential for climate modelling, especially for regions such as Amazonia, where the response of the regional atmospheric circulation to the changes on surface albedo is strong. Previous studies have indicated that models are still unable to correctly reproduce details of the seasonal variation of surface albedo. Therefore, it was investigated the role of canopy wetness on the simulated albedo of a tropical rainforest by modifying the IBIS canopy radiation transfer code to incorporate the effects of canopy wetness on the vegetation reflectance. In this study, simulations were run using three versions of the land surface/ecosystem model IBIS: the standard version, the same version recalibrated to fit the data of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy etness; Diurnal albedo; Tropical forest and simulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400005

Spatial distribution of pollen grains and spores in surface sediments of Guanabara Bay, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Barreto,Cintia F.; Vilela,Claudia G.; Baptista-Neto,José A.; Barth,Ortrud M.
Aiming to investigate the deposition of pollen grains and spores in Guanabara Bay, Rio de Janeiro State, 61 surface sediment samples were analyzed. The results showed that the current deposition of palynomorphs in surface sediments of Guanabara Bay represents the regional vegetation of this hydrographic basin. The differential distribution of palynomorphs followed a pattern influenced by bathymetry, tidal currents speed, discharge of numerous rivers, and by human activity. The dominance of representatives of Field Vegetation reflects the changes of the original flora caused by intense human activities in the region. The continued presence and richness of pollen types of rain forest in the samples indicates that their source area might be the vegetation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynomorphs; Surface sediments; Deposition; Preservation; Guanabara Bay; Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300006

Embryo and larval development of the yellow clam Mesodesma mactroides (Reeve, 1854) (Mesodesmatidae) in laboratory
Provedor de dados: 42
Autores: SANTOS,JUAN J.S.; BERNARDES,JULIANA P.; RAMÍREZ,JUAN R.B.; RAMOS,CÁSSIO O.; GOMES,CARLOS HENRIQUE A. DE MIRANDA; ROMANO,LUIS ALBERTO.
Abstract  The yellow clam Mesodesma mactroides (Reeve, 1854) is a sand mollusc with historical and socioeconomic importance in Brazil, Uruguay and Argentina. A guaranteed form to access a successful reestablishment of the species in their natural environment is directly linked to their reproduction biology. Then, our report introduces the embryonic and larval development of the yellow clam reared in laboratory for such purposes. M. mactroides broodstock were selected as specimens who possess a mean total shell length and weight of 66 ± 3.82 mm and 27.15 ± 4.07 g for an afterwards spawn induction through stripping technique. Regarding the embryonic development, newly fertilized oocytes exhibited a mean diameter of 51.20 ± 6.64 μm. The first polar corpuscle,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broodstock; D-veliger; M. mactroides; Pediveliger; Sand mollusk; Stripping.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201009

A study of publication trajectories of the Brazilian Computer Science community
Provedor de dados: 42
Autores: ALBERTINI,MARCELO K.; BACKES,ANDRÉ R.; SÁ,ADRIANO L. DE.
Abstract: The average faculty productivity have been described as a rapid rise-short peak-gradual decline pattern. Way et al. (2017) have studied this pattern for faculty careers in Computer Science in North America using a piecewise linear model. In this paper, we use a similar methodology and study trajectories (N = 20655) of the Brazilian Computer Science community. First, we have evaluated how the median publication count of researchers is related to institution prestige and public vs. private administration. Second, we have studied how the annual publication rates have increased and its variation according to prestige ranks of institutions. Third, we have found the average trajectory can indeed be described as the canonical rapid increase and slower...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plataforma Lattes; Faculty productivity; Publication count; Brazilian Computer Science community.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000501001

Late Paleozoic exhumed glacial erosive landscape in Salto, SP
Provedor de dados: 42
Autores: VIVIANI,JULIANA B.; ROCHA-CAMPOS,ANTONIO C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300034

Comparative analysis of the song of the Rufous-collared Sparrow Zonotrichia capensis (Emberizidae) between Campinas and Botucatu, São Paulo State, Brazil
Provedor de dados: 42
Autores: Avelino,Márcio F.; Vielliard,Jacques M.E.
The regional dialects or regiolects of the Rufous-collared Sparrow Zonotrichia capensis were compared between Campinas (47º06'W-22º90'S) and Botucatu (48º44'W-22º88'S), São Paulo State, Southeastern Brazil. Songs of 88 individuals from thirteen localities were recorded. Sonograms showed that two areas presented more homogeneous songs, forming two regiolects. In 11 localities most individuals shared the same song type. At the other two localities, they sang up to 5 different song types. This occurs at the boundaries of the regiolects, and was also where individuals singing more than one song type were found. Similarities between song types were not related to geographic distance between the respective singers. A comparative analysis showed similarities in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioacoustics; Geographic variation; Zonotrichia capensis; Birds; São Paulo State; Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200023

Evaluation of micro-energy dispersive X-ray fluorescence and histochemical tests for aluminium detection in plants from High Altitude Rocky Complexes, Southeast Brazil
Provedor de dados: 42
Autores: CAMPOS,NAIARA V.; PEREIRA,TIAGO A.R.; MACHADO,MARIANA F.; GUERRA,MARCELO B.B.; TOLENTINO,GLÁUCIA S.; ARAÚJO,JOSIANE S.; REZENDE,MAÍRA Q.; SILVA,MARIA CAROLINA N.A. DA; SCHAEFER,CARLOS E.G.R.
The soils developed under High Altitude Rocky Complexes in Brazil are generally of very low chemical fertility, with low base saturation and high exchangeable aluminium concentration. This stressful condition imposes evolutionary pressures that lead to ecological success of plant species that are able to tolerate or accumulate high amounts of aluminium. Several analytical methods are currently available for elemental mapping of biological structures, such as micro-X-ray fluorescence (μ-EDX) and histochemical tests. The aim of this study was to combine μ-EDX analysis and histochemical tests to quantify aluminium in plants from High Altitude Rocky Complexes, identifying the main sites for Al-accumulation. Among the studied species, five showed total Al...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Al-hyperaccumulator plants; Aluminon; Chrome azurol; High Altitude Rocky Complexes; Μ-EDX.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100285

40Ar/39Ar geochronology at the Instituto de Geociências, USP: instrumentation, analytical procedures, and calibration
Provedor de dados: 42
Autores: VASCONCELOS,PAULO M.; ONOE,ARTUR T.; KAWASHITA,KOJI; SOARES,ADALBERTO J.; TEIXEIRA,WILSON.
Laser heating 40Ar/39Ar geochronology provides high analytical precision and accuracy, mum-scale spatial resolution, and statistically significant data sets for the study of geological and planetary processes. A newly commissioned 40Ar/39Ar laboratory at CPGeo/USP, São Paulo, Brazil, equips the Brazilian scientific community with a new powerful tool applicable to the study of geological and cosmochemical processes. Detailed information about laboratory layout, environmental conditions, and instrumentation provides the necessary parameters for the evaluation of the CPGeo/USP 40Ar/39Ar suitability to a diverse range of applications. Details about analytical procedures, including mineral separation, irradiation at the IPEN/CNEN reactor at USP, and mass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochronology; 40Ar/39Ar method; Irradiation; Calibration.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200008

A brief note on the paleofauna of "Tartaruguito site", Adamantina Formation, Bauru Group, Brazil
Provedor de dados: 42
Autores: HENRIQUES,DEISE D.R.; SUÁRES,JOSÉ M.; AZEVEDO,SERGIO A.K.; CAPILLA,RAMSES; CARVALHO,LUCIANA B.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200019

Biological Activity of Piper aduncum extracts on Anticarsia gemmatalis (Hübner) (Lepidoptera: Erebidae) and Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)
Provedor de dados: 42
Autores: LUCENA,DAIANE C.; BERTHOLDO-VARGAS,LUCIA R.; SILVA,WILSON C.; MACHADO,AARON F.; LOPES,TAMIRIS S.; MOURA,SIDNEI; BARROS,NEIVA M.
ABSTRACT Piper aduncum found naturally in the Amazon and southeastern Brazil, is known for its secondary metabolites that have activity on insects. Anticarsia gemmatalis and Spodoptera frugiperda are among the major insect pests associated with agricultural production. This research evaluated the biological activity of hexane, ethyl acetate, and ethanol extracts of P. aduncum leaves on mortality and duration of larval and pupal periods, as well as weight, width, and length of A. gemmatalis and S. frugiperda pupae. The mortality of A. gemmatalis larvae in trials with P. aduncum extracts were 93.3% (hexane) and 90% (ethyl acetate), estimating LC50 of 6.35 and 5.79 mg/mL, respectively. Mortality in S. frugiperda submitted to the hexane extract ranged from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fall armyworm; Velvetbean caterpillar; Pest management; Plant extracts.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401869

Future perspective for diagnosis in autoimmune diseases
Provedor de dados: 42
Autores: Andrade,Luis E. C.
Human beings have taken successive approaches for the understanding and management of diseases. Initially brewed in supernatural concepts and mystical procedures, a vigorous scientific approach has emerged on the grounds of fundamental disciplines such as anatomy, microbiology, biochemistry, physiology, immunology, pathology, and pharmacology. The resulting integrated knowledge contributed to the current classification of diseases and the way Medicine is carried out today. Despite considerable progress, this approach is rather insufficient when it comes to systemic inflammatory conditions, such as systemic lupus erythematosus, that covers clinical conditions ranging from mild pauci-symptomatic diseases to rapidly fatal conditions. The treatment for such...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autoimmunity; Pharmacogenetics; Gene polymorphism; Auto-inflammatory diseases; Systemic lupus erythematosus; Rheumatoid arthritis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300004

Growth of immature Chironomus calligraphus (Diptera, Chironomidae) in laboratory conditions
Provedor de dados: 42
Autores: Canteiro,Rita de Cássia S.A.; Albertoni,Edélti F.
Chironomidae larvae are important macroinvertebrates in limnic environments, but little knowledge exists about their biometrics development characteristics. This study aims to describe the immature Chironomus calligraphus Goeldi, 1905 under laboratory conditions by the accomplishment of thirteen egg masses from eggs eclosion to adults emergency, at controlled room temperature (25ºC) and photoperiod (12-12h). Larvae were feed ad libitum with "Alcon Basic - MEP 200 Complex" fish food and commercial dehydrated Spirulina. The postures had a mean length of 9 ± 1 mm (n = 13) and 348 ± 66 eggs. The brownish colored eggs with elliptical shape had length of 160.3 ± 17.7 µm (n = 130), being arranged as an organized string in a pseudo spiral form. The time duration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insects; Laboratory development; Larval instars; Life cycle.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400015

Spatial distribution and control levels of Anastrepha spp. (Diptera: Tephritidae) in guava orchards
Provedor de dados: 42
Autores: NICÁCIO,JOSÉ; OLIVEIRA,ISAIAS DE; UCHOA,MANOEL A.; FACCENDA,ODIVAL; ABOT,ALFREDO R.; FERNANDES,MARCOS G.; GARCIA,FLÁVIO R.M.
Abstract: This study aimed to know the patterns of spatial distribution of Anastrepha spp. and establish a criterion for determining the appropriate time for pest control. For this, 90 McPhail traps were used as Sampling Units (SU) divided into three commercial orchards of Novo Milênio guava with a total area of 14 ha. Traps were interspersed between the rows of plants, systematically in the orchards, hung and baited with 5% hydrolyzed corn protein with weekly collections. We caught 8,170 Anastrepha spp. in 840 SU. The mean infestation index was compared to the three types of distribution: random, uniform, aggregate, and fit by the theoretical frequency distributions of Poisson, negative binomial and positive binomial. The populations of Anastrepha...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Index of aggregation; Negative binomial; McPhail trap; Fruit pests.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500854

Evidence of tutoring in the development of subsong in newly-fledged Meyer's Parrots Poicephalus meyeri
Provedor de dados: 42
Autores: Masin,Simone; Massa,Renato; Bottoni,Luciana.
Subsongs are vocal trials uttered by young birds to practice songs. Among songbirds, subsongs are displayed by individuals in their first year of life. Studies on Zebra Finches Poephila guttata suggest that the juveniles learn their songs from a vocal tutor, their father. In this study we examine the subsongs in six captive-born Meyer's Parrots Poicephalus meyeri, from fledging time to weaning. Recordings of songs from chicks and fathers were analyzed for similarities in frequency and time parameters. With age, the subsongs of the chicks became more similar to the vocalizations of the fathers with 20% similarity rating in the first week after fledging to 100% at weaning time. Moreover, fledged chicks were exposed to a wide range of stimuli from several...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subsong; Notes; Vocal tutor; Meyer's Parrot; Psittacidae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200006

Selectivity and efficiency of pyrene attachment to alkanes induced by broadband X-rays
Provedor de dados: 42
Autores: BROWN,GERALD O.; GUARDALA,NOEL A.; PRICE,JACK L.; WEISS,RICHARD G.
Bombardment of pyrene-doped n-heneicosane (C21H44) in its orthorhombic solid phase with &lt;1.3&gt; MeV broadband X-rays results in the formation of both mono- and di-heneicosylpyrenes, whereas the same dose in liquid cyclohexane yields only monosubstituted pyrene. In both cases, the reaction efficiency decreases as pyrene concentration is increased from 10-5 to 10-2 M. Qualitatively, the overall attachment efficiency is higher in orthorhombic n-heneicosane than in liquid cyclohexane, but the selectivity of attachment is greater in cyclohexane. Differences between these results and those from irradiations of the same samples with eV range photons are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broadband x-rays; Pyrene; Cyclohexane; Heneicosane.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100005

The family Phoxocephalopsidae (Crustacea: Amphipoda) from Brazilian coastal waters with description of four new species
Provedor de dados: 42
Autores: DO NASCIMENTO,PRISCILA S.; SEREJO,CRISTIANA S.
Abstract Phoxocephalopsids are fossorial amphipods endemic to the Southern Hemisphere and currently encompass five genera and 15 species, including the four new species herein described. Previous records of the family along the Brazilian coast are limited to Phoxocephalopsis zimmeriSchellenberg, 1931. Based on material from the Crustacean Collection of Museu Nacional/UFRJ four new species of Phoxocephalopsidae areherein described: Phoxocephalopsis ruffoi sp. nov. from Rio de Janeiro, São Paulo, Paraná and Rio Grande do Sul (23o-30oS); Puelche irenae sp. nov. from Espírito Santo and Rio de Janeiro (19o-23oS); Puelche longidactylus sp. nov. from Bahia, Espírito Santo and Rio de Janeiro (12o-23oS) and Puelche mourae sp. nov. found only at Rio de Janeiro. High...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Southwestern Atlantic; Campos Basin; New species; Phoxocephalopsis; Puelche; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603031

Petrography of gypsum-bearing facies of the Codó Formation (Late Aptian), Northern Brazil
Provedor de dados: 42
Autores: Paz,Jackson D.S.; Rossetti,Dilce F.
An original and detailed study focusing the petrography of evaporites from the Late Aptian deposits exposed in the eastern and southern São Luís-Grajaú Basin is presented herein, with the attempt of distinguishing between primary and secondary evaporites, and reconstructing their post-depositional evolution. Seven evaporites phases were recognized: 1. chevron gypsum; 2. nodular to lensoidal gypsum or anhydrite; 3. fibrous to acicular gypsum; 4. mosaic gypsum; 5. brecciated gypsum or gypsarenite; 6. pseudo-nodular anhydrite or gypsum; and 7. rosettes of gypsum. The three first phases of gypsum display petrographic characteristics that conform to a primary nature. The fibrous to acicular and mosaic gypsum were formed by replacement of primary gypsum, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaporite; Petrography; Paleolake; Sabkha; Late Aptian; São Luís-Grajaú Basin.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300014

Influence of Duroc breed inclusion into Polish Landrace maternal line on pork meat quality traits
Provedor de dados: 42
Autores: GUZEK,DOMINIKA; GŁĄBSKA,DOMINIKA; GŁĄBSKI,KRZYSZTOF; WIERZBICKA,AGNIESZKA.
Crossbreeding with Duroc breed allows to improve meat quality, but no data is available regarding specific influence of Duroc breed on characteristics of meat in the case of crossbreeding with various breeds. The aim of the present research was to evaluate the effect of crossbreeding Polish Landrace dames with Duroc sires on quality features of meat in reference to Polish Landrace breed. The objects of the study were Longissimus dorsi lumborum pork muscles obtained from Polish Landrace breed and Polish Landrace x Duroc crossbreed animals. Sarcomere length measurements were conducted using microscopic method and basic chemical composition measurement was analyzed using spectrophotometric scanning. Texture analysis of meat samples, performed after thermal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pork; Sarcomere length; Protein and fat content; Shear force; Color.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301079

Polymorphisms in CYP2E1, GSTM1 and GSTT1 and anti-tuberculosis drug-induced hepatotoxicity
Provedor de dados: 42
Autores: BRITO,TAIS C.; POSSUELO,LIA G.; VALIM,ANDREIA R.M.; TODENDI,PÂMELA F.; RIBEIRO,ANDREZZA W.; GREGIANINI,TATIANA S.; JARCZEWSKI,CARLA A.; HUTZ,MARA H.; ROSSETTI,MARIA LUCIA R.; ZAHA,ARNALDO.
Anti-tuberculosis drug-induced hepatitis (ATD- induced hepatitis) has been linked to polymorphisms in genes encoding drug metabolizing enzymes. N-acetyltransferase 2 (NAT2), cytochrome P450 2E1 (CYP2E1) and glutathione S-transferase (loci GSTM1 and GSTT1) are involved in the metabolism of isoniazid, the most toxic drug for the treatment of tuberculosis (TB). This study was designed to determine the frequency and to evaluate whether polymorphisms at CYP2E1, GSTM1 and GSTT1 genes are associated with drug response, as well as to identify clinical risk factors for ATD-induced hepatitis. A total of 245 Brazilian patients undergoing treatment for TB were genotyped using polymerase chain reaction and restriction fragment length polymorphism and sequencing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatotoxicity; Isoniazid; Polymorphisms; Tuberculosis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200855

Molecular identification of a cyclodextrin glycosyltransferase-producing microorganism and phylogenetic assessment of enzymatic activities
Provedor de dados: 42
Autores: LANDRIEL,SOLEDAD CAMINATA; CASTILLO,JULIETA D.L.M.; TABOGA,OSCAR A.; FERRAROTTI,SUSANA A.; GOTTLIEB,ALEXANDRA M.; COSTA,HERNÁN.
Abstract: Cyclodextrin glycosyltransferases (CGTases) are important enzymes in the biotechnology field because they catalyze starch conversion into cyclodextrins and linear oligosaccharides, which are used in food, pharmaceutical and cosmetic industries. The CGTases are classified according to their product specificity in α-, β-, α/β- and γ-CGTases. As molecular markers are the preferred tool for bacterial identification, we employed six molecular markers (16S rRNA, dnaK, gyrB, recA, rpoB and tufA) to test the identification of a CGTase-producing bacterial strain (DF 9R) in a phylogenetic context. In addition, we assessed the phylogenetic relationship of CGTases along bacterial evolution. The results obtained here allowed us to identify the strain DF 9R as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyclodextrin glycosyltransferases; Housekeeping genes; Paenibacillus; 16S rRNA.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500620

The use of microsatellite markers in Neotropical studies of wild birds: a literature review
Provedor de dados: 42
Autores: MOURA,RENAN F.; DAWSON,DEBORAH A.; NOGUEIRA,DENISE M.
ABSTRACT Despite extensive habitat fragmentation, the Neotropical region possesses 30% of the world´s bird species. Microsatellites have remained one of the most popular genetic markers and have been used in ecological and conservation studies since the 1990’s. We conducted a literature review comparing the number of papers published from January 1990 to July 2015 that used microsatellite markers for studies of wild birds in the Neotropical region, USA and some European countries. We assigned the articles to three categories of studies: population genetics, animal behavior/kinship analysis and the development of species-specific bird microsatellite markers. We also compared the studies in the Neotropics that used heterologous versus species-specific...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AVES; Cross-species amplification; Biodiversity; Ecology; Molecular markers; STR.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100145

Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
Provedor de dados: 42
Autores: Dantas,Ênio W.; Moura,Ariadne N.; Bittencourt-Oliveira,Maria do Carmo.
This study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. Phytoplankton density was quantified for the determination of the biomass of cyanobacteria. The data were analyzed using CCA. Higher mean phytoplankton biomass values (29.8 mm³.L-1) occurred in the period of thermal stratification. A greater similarity in the phytoplankton communities also occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Cylindrospermopsis raciborskii; Seasonal dynaics; Theral pattern.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019

Homophonic substitution
Provedor de dados: 42
Autores: ROCHA JR,VALDEMAR C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300037

Half-ironman induces changes in the kidney function of triathletes
Provedor de dados: 42
Autores: PUGGINA,ENRICO F.; MACHADO,DALMO R.L.; TOURINHO FILHO,HUGO; BARBANTI,VALDIR J.
Long duration exercise may lead to the occurrence of urine abnormalities. Aiming to investigate the effects of triathlon training and competition on the renal function, twelve male triathletes (32.60 ± 5.10 years, 175.04 ± 6.67m, 71.83 ± 7.42Kg) were studied during the 12-week training protocol and after a Half Ironman. Urine was collected in M-1 – beginning of the training season, M-2 – before the competition and M-3 – after the half ironman. Urine pH was measured using reagent strips, density with a refractometer, proteinuria by Bradford assay, creatinine with a colorimetric assay and blood cells by microscopy. Data were analyzed using Shapiro-Wilk test, One-Way ANOVA and Tukey-Kramer test (p &lt; 0,05). Changes were found after the competition in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endurance training; Half-ironman; Kidney function; Urine analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100429

Limited replication of yellow fever 17DD and 17D-Dengue recombinant viruses in rhesus monkeys
Provedor de dados: 42
Autores: Trindade,Gisela F.; Marchevsky,Renato S.; Fillipis,Ana M.B. de; Nogueira,Rita M.R.; Bonaldo,Myrna C.; Acero,Pedro C.; Caride,Elena; Freire,Marcos S.; Galler,Ricardo.
For the development of safe live attenuated flavivirus vaccines one of the main properties to be established is viral replication. We have used real-time reverse transcriptase-polymerase chain reaction and virus titration by plaque assay to determine the replication of yellow fever 17DD virus (YFV 17DD) and recombinant yellow fever 17D viruses expressing envelope proteins of dengue virus serotypes 2 and 4 (17D-DENV-2 and 17D-DENV-4). Serum samples from rhesus monkeys inoculated with YFV 17DD and 17D-DENV chimeras by intracerebral or subcutaneous route were used to determine and compare the viremia induced by these viruses. Viral load quantification in samples from monkeys inoculated by either route with YFV 17DD virus suggested a restricted capability of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yellow fever; Dengue; Vaccine; Attenuation; Replication; Real-time RT-PCR.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200009

Collaboration Networks in the Brazilian Scientific Output in Evolutionary Biology: 2000-2012
Provedor de dados: 42
Autores: Santin,Dirce M.; Vanz,Samile A.S.; Stumpf,Ida R.C.
This article analyzes the existing collaboration networks in the Brazilian scientific output in Evolutionary Biology, considering articles published during the period from 2000 to 2012 in journals indexed by Web of Science. The methodology integrates bibliometric techniques and Social Network Analysis resources to describe the growth of Brazilian scientific output and understand the levels, dynamics and structure of collaboration between authors, institutions and countries. The results unveil an enhancement and consolidation of collaborative relationships over time and suggest the existence of key institutions and authors, whose influence on research is expressed by the variety and intensity of the relationships established in the co-authorship of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Co-authorship; Collaboration networks; Evolutionary Biology; Scientific collaboration; Scientific output; Scientometrics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100165

Paradoxical sleep deprivation: neurochemical, hormonal and behavioral alterations. Evidence from 30 years of research
Provedor de dados: 42
Autores: Tufik,Sergio; Andersen,Monica L.; Bittencourt,Lia R. A.; Mello,Marco T. de.
Sleep comprises approximately one-third of a person's lifetime, but its impact on health and medical conditions remains partially unrecognized. The prevalence of sleep disorders is increasing in modern societies, with significant repercussions on people's well-being. This article reviews past and current literature on the paradoxical sleep deprivation method as well as data on its consequences to animals, ranging from behavioral changes to alterations in the gene expression. More specifically, we highlight relevant experimental studies and our group's contribution over the last three decades.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sleep; Sleep deprivation; Rebound; Dopamine; Erection; Corticosterone; Memory.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300016

Positive operator valued measures and the quantum Monty Hall problem
Provedor de dados: 42
Autores: Zander,Claudia; Casas,Montserrat; Plastino,Angel; Plastino,Angel R.
A quantum version of the Monty Hall problem, based upon the Positive Operator Valued Measures (POVM) formalism, is proposed. It is shown that basic normalization and symmetry arguments lead univocally to the associated POVM elements, and that the classical probabilities associated with the Monty Hall scenario are recovered for a natural choice of the measurement operators.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quantum Measurements; Monty Hall Problem; Quantum Information Theory.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300003

Microscopic aspects of electrosensory system on the partially euryhaline lesser guitarfish
Provedor de dados: 42
Autores: RANGEL,BIANCA S.; WOSNICK,NATASCHA; AMORIM,ALBERTO F.; K. JUNIOR,JOSÉ ROBERTO; RICI,ROSE E.G.
ABSTRACT The electrosensory system on elasmobranchs consists of subcutaneous electroreceptor organs known as ampullae of Lorenzini. The present study investigated the ampullae of Lorenzini morphology of the lesser guitarfish Zapteryx brevirostris, using light microscopy and scanning electron microscopy. The pore number found in the ventral skin surface is much higher than that found in the dorsal portion, characteristic of species that inhabit the euphotic zone. Under light microscopy it was possible to observe that the wall canal consists of a single layer of squamous epithelial cells. The canal features distal expansion, where the ampullae are located with up to six alveoli. The sensory epithelium of ampullae is composed by cubic cells, with oval...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Ampullae of Lorenzini; Electroreceptors; Light microscopy; Scanning electron microscopy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100037

Applicability of geomechanical classifications for estimation of strength properties in Brazilian rock masses
Provedor de dados: 42
Autores: SANTOS,TATIANA B.; LANA,MILENE S.; SANTOS,ALLAN E.M.; SILVEIRA,LARISSA R.C.
ABSTRACT Many authors have been proposed several correlation equations between geomechanical classifications and strength parameters. However, these correlation equations have been based in rock masses with different characteristics when compared to Brazilian rock masses. This paper aims to study the applicability of the geomechanical classifications to obtain strength parameters of three Brazilian rock masses. Four classification systems have been used; the Rock Mass Rating (RMR), the Rock Mass Quality (Q), the Geological Strength Index (GSI) and the Rock Mass Index (RMi). A strong rock mass and two soft rock masses with different degrees of weathering located in the cities of Ouro Preto and Mariana, Brazil; were selected for the study. Correlation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geomechanical classifications; Rock slopes; Stability analyses; Strength properties of rock masses.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300859

Phenotypic variance of black oat growing in crop seasons reveals genetic effects predominance
Provedor de dados: 42
Autores: MEIRA,DANIELA; MEIER,CARINE; OLIVOTO,TIAGO; NARDINO,MAICON; RIGATTI,ALEXSANDER; KLEIN,LUÍS ANTÔNIO; CARON,BRAULIO O.; MARCHIORO,VOLMIR S.; SOUZA,VELCI Q. DE.
Abstract: This work aimed to determine variance components and genetic parameters, as well as phenotypic, genetic and environmental correlations among black oat (Avena strigosa) families grown in different crop season. Seventy-six black oat families and three controls (BRS Madrugada, BRS Centauro, BRS 139 Neblina) were evaluated in two crop seasons (2016 and 2017), using families with intercalary controls experimental design. The results reveled high potential of black oat families to compose a breeding program, due to families and controls variance were similar, variance components expressed greater genetic variance origin for crop season. Panicle weight and panicle grain weight presented high heritability and, these are correlated with panicle length....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Genetic correlation; Genetic parameters; Plant breeding.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500864

Ecotoxicology assay for the evaluation of environmental water quality in a tropical urban estuary
Provedor de dados: 42
Autores: NILIN,JEAMYLLE; SANTOS,ANDERSON A.O.; NASCIMENTO,MEGGIE K.S.
Abstract Most studies evaluating the impacts of river pollution in the semi-arid region of Brazil have been geared towards physiochemical analyses, and investigations of the adverse effects of water pollution on associated organisms are scarce. This study aimed to evaluate the water quality in the Poxim river estuary in Aracaju, Sergipe throughout the dry and rainy season by evaluating the survival of the microcrustacean Mysidopsis juniae and physicochemical analyses. The evaluation of physiochemical parameters revealed a decrease in dissolved oxygen content in the rainy season. However, there was a significant reduction in microcrustacean survival in samples during the dry season, when the river flow is reduced and effluents become concentrated. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poxim River; Sergipe; Mysidopsis juniae; Basic sanitation; Acute toxicity; Brackishwater pollution.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100604

Microclimatic conditions in the canopy strata and its relations with the soybean yield
Provedor de dados: 42
Autores: SCHWERZ,FELIPE; CARON,BRAULIO O.; ELLI,ELVIS F.; STOLZLE,JOHN R.; MEDEIROS,SANDRO L.P.; SGARBOSSA,JAQUELINE; ROCKENBACH,ANA P.
Abstract: Despite its economic importance, the microclimate in soybean canopies has not yet been studied in detail. Such a study can yield valuable information regarding the interaction of a crop with its environment. In this context, the aim of this study was to evaluate the solar radiation dynamic and yield responses for each canopy strata for two soybean cultivars with determined and undetermined growth habits. A field study was conducted during the 2013/2014 and 2014/2015 growing seasons in the city of Frederico Westphalen, Rio Grande do Sul, Brazil. The cultivar NA6411, with a determinate growth habit, presented a greater interception of radiation in the middle and lower canopies strata which results in higher soybean yield when compared to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy architecture; Glycine max L.; Radiation use efficiency; Extinction coefficient.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500861

The monotypic Brazilian genus Diacrodon is a synonym of Borreria (Spermacoceae, Rubiaceae): morphological and molecular evidences
Provedor de dados: 42
Autores: MIGUEL,LAILA M.; SOBRADO,SANDRA V.; JANSSENS,STEVEN; DESSEIN,STEVEN; CABRAL,ELSA L.
ABSTRACT Diacrodon is a monotypic genus of the tribe Spermacoceae (Rubiaceae), endemic to northeastern Brazil. Diacrodon compressus is frequently misidentified with a two lobed calyx species of Borreria, B. verticillata. Traditionally, in Spermacoceae the fruit type was considered a diagnostic character among the genera. In this sense, D. compressus presents a strongly compressed, one seeded and indehiscent fruit (vs. globose, two seeded and dehiscent fruit in B. verticillata). In this work, we address two objectives: evaluate the systematic position and determine the identity of Diacrodon in respect to other taxa. Molecular analyses using ITS and ETS indicate that D. compressus is strongly related to other species of Borreria. The morphological results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flower; Fruit; ITS-ETS dataset; Morphology; Pollen; Seed.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401397

Geochronology and heavy metal flux to Guanabara bay, Rio de Janeiro state: a preliminary study
Provedor de dados: 42
Autores: Baptista Neto,José A.; Peixoto,Tomás C.S.; Smith,Bernard J.; Mcalister,John J.; Patchineelam,Soraya M.; Patchineelam,Sambasiva R.; Fonseca,Estefan M.
Guanabara Bay, located in Rio de Janeiro state. It is surrounded by the second most important metropolitan area of the country. Over recent decades, land disturbance and urbanization in the surrounding area has significantly increased sediment input to the bay and had a negative effect on its overall environmental. This is especially related to high volumes of untreated sewage and industrial effluents. This study evaluates the history of this human impact through detailed examination of a sediment core taken from the northern portion of Guanabara Bay. A geochronology is established using 210Pb dating and related to organic carbon and heavy metal fluxes to the sediments. This gave a calculated net average sedimentation rate for the core of 0.67 cm.year-1....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 210Pb; Geochronology; Flux of heavy metal; Guanabara Bay.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401317

Physical-mechanical characterization of two amazon woods coming from the second cutting cycle
Provedor de dados: 42
Autores: BALBONI,BRUNO M.; SILVA,TARCILA S. DA; ANDRADE,FERNANDO W.C.; DE FREITAS,LUCAS J.M.; MOUTINHO,VICTOR H.P.
Abstract Due to changes in the Amazon forest dynamics after the first cutting cycle, non exploited species become dominant in the forest. The lack of technological knowledge makes it hard to commercialize these woods, making the understanding of their physical-mechanical properties a fundamental step to properly define their applications. This study aimed to characterize physically and mechanically the wood of Pseudopiptadenia psilostachya and Eschweilera ovata from the second cutting cycle of the Tapajós National Forest, intending to commercially promote and to identify usages for them, as well as to evaluate the viability of replacement of highly commercialized species. The tests were performed accordingly to the Brazilian standard NBR 7190. P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulk density; Shrinkage; MOR; MOE; Classes of resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703565

Influence of temperature and conductivity on the life-history characteristics of a pampean strain of Brachionus plicatilis
Provedor de dados: 42
Autores: FERRANDO,NOELIA S.; CLAPS,MARÍA C.; BENÍTEZ,HERNÁN H.; GABELLONE,NÉSTOR A.
ABSTRACT In the present work, we provide the first approach about the life-history of Brachionus plicatilis in South America. We tested with laboratory experiments the response of the pampean strain of B. plicatilis for two of its main stressors (conductivity and temperature). We evaluated the effects of eight conductivity values from 1 to 17 mS.cm-1 and two temperatures (15 and 25 °C) to compare its abundance with those obtained in the pampean lotic and lentic environments, where this rotifer is frequent or dominant. The results demonstrated that the increase in population-growth rate and the peak of abundance occurred at the highest temperature and at medium conductivity. Minimum values were obtained at the lowest temperature and conductivities analyzed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euryhaline rotifer; Experimental cultures; Growth rate; Salinity; Temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401431

Ecology of the bromeligenous frog Phyllodytes luteolus (Anura, Hylidae) from three restinga remnants across Brazil's coast
Provedor de dados: 42
Autores: Motta-Tavares,Tatiana; Maia-Carneiro,Thiago; Dantas,Leonardo F.; Sluys,Monique Van; Hatano,Fábio H.; Vrcibradic,Davor; Rocha,Carlos F.D.
In this study, we analyzed diet, sexual dimorphism and bromeliad use in three populations of the hylid frog Phyllodytes luteolus from restinga habitats along the Brazilian coast. We found 13 arthropods categories in 161 stomachs. Ants and termites were the dominant prey items. The similar trophic niche across populations suggests this species has a conservative diet. We found sexual dimorphism regarding body size and jaw width. We recordedP. luteolus in five bromeliad species, but predominantly inAechmeablanchetiana (35.6% of individuals recorded). We recorded solitary individuals in 44% of occupied bromeliads, and never found two males sharing the same bromeliad. The data is suggestive that populations ofP. luteolus has a conservative diet independent of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Bromeliad; Diet; Sexual dimorphism; Territorial behavior.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100093

Terpene Esters from Natural Products: Synthesis and Evaluation of Cytotoxic Activity
Provedor de dados: 42
Autores: VICTOR,MAURICIO M.; DAVID,JORGE M.; SAKUKUMA,MARIA C.K.; COSTA-LOTUFO,LETÍCIA V.; MOURA,ANDREA F.; ARAÚJO,ANA J.
ABSTRACT Natural steroids and triterpenes such as b-sitosterol, stigmasterol, lupeol, ursolic and betulinic acids were transformed into its hexanoic and oleic esters, to evaluate the influence of chemical modification towards the cytotoxic activities against tumor cells. The derivatives were evaluated against five tumor cell lines [OVCAR-8 (ovarian carcinoma); SF-295 (glioblastoma); HCT-116 (colon adenocarcinoma); HL-60 (leukemia); and PC-3 (prostate carcinoma)] and the results showed only betulinic acid hexyl ester exhibits cytotoxic potential activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumor activity; Chemical modification; Derivative synthesis; Natural products esters.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401369

Quantification of porosity evolution from unaltered to propylitic-altered granites: the 14C-PMMA method applied on the hydrothermal system of Lavras do Sul, Brazil
Provedor de dados: 42
Autores: Bongiolo,Everton M.; Bongiolo,Daniela E.; Sardini,Paul; Mexias,André S.; Siitari-Kauppi,Marja; Gomes,Márcia E.B.; Formoso,Milton L.L.
This work is an application of the 14C-Polymethylmethacrylate method to compare the porosity evolution between unaltered and propylitic-altered granites, using samples from Lavras do Sul region, Brazil. This method, when coupled with optical and electronic petrography has the advantage over other methods to provide the quantification and identification of total and local porosity of rocks. From petrographic observations, different kinds of porous zones were identified and quantified (microfractures, grain boundaries, alteration of minerals, etc). Results show that unaltered granites have 0.5 to 0.6% porosity and propylitic-altered ones have 1.7 to 1.8% porosity, even between samples with different textures. Porosity of altered rocks increases mainly due to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosity quantification; 14C-PMMA method; Granite porosity; Hydrothermal alteration; Propylitic alteration; Lavras do Sul.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300011

Soil conservation practices in a watershed in Southern Brazil
Provedor de dados: 42
Autores: TELLES,TIAGO S.; LOURENÇO,MARCO A.P.; OLIVEIRA,JOSÉ F.; COSTA,GUSTAVO V.; BARBOSA,GRAZIELA M.C.
Abstract: The aim of this study was to determine how often rural farmers in a watershed use no-tillage systems combined with crop rotation, contour farming and agricultural terraces. The study area was Paraná Watershed III (PB3) in the western region of Paraná State, and data from the 2006 Agricultural Census of the Brazilian Institute of Geography and Statistics were used. A frequency distribution analysis of farms as a function of the no-tillage (NT) area was conducted in combination with a cluster analysis of soil and water conservation practices (adoption of crop rotation, contour farming and agricultural terrace practices). The results showed that the farms in PB3 adopt adequate soil and water conservation practices, with 73% adopting NT combined with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contour farming; Agricultural terraces; Crop rotation; Conservation agriculture.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500866

Silicon-based spin and charge quantum computation
Provedor de dados: 42
Autores: Koiller,Belita; Hu,Xuedong; Capaz,Rodrigo B.; Martins,Adriano S.; Das Sarma,Sankar.
Silicon-based quantum-computer architectures have attracted attention because of their promise for scalability and their potential for synergetically utilizing the available resources associated with the existing Si technology infrastructure. Electronic and nuclear spins of shallow donors (e.g. phosphorus) in Si are ideal candidates for qubits in such proposals due to the relatively long spin coherence times. For these spin qubits, donor electron charge manipulation by external gates is a key ingredient for control and read-out of single-qubit operations, while shallow donor exchange gates are frequently invoked to perform two-qubit operations. More recently, charge qubits based on tunnel coupling in P+2 substitutional molecular ions in Si have also been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semiconductors; Quantum computation; Nanoelectronic devices; Spintronics; Nanofabrication; Donors in silicon.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200002

On the existence of Levi Foliations
Provedor de dados: 42
Autores: OSTWALD,RENATA N.
Let L &lt;img src="http:/img/fbpe/aabc/v73n1/0059c.gif"&gt; &lt;img src="http:/img/fbpe/aabc/v73n1/0059c2.gif"&gt; be a real 3 dimensional analytic variety. For each regular point p &lt;img src="http:/img/fbpe/aabc/v73n1/0059e.gif"&gt; L there exists a unique complex line l p on the space tangent to L at p. When the field of complex line p &lt;img ALIGN="MIDDLE" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img4.gif" ALT="$\displaystyle \mapsto$"&gt; l p is completely integrable, we say that L is Levi variety. More generally; let L &lt;img src="http:/img/fbpe/aabc/v73n1/0059c.gif"&gt; M be a real subvariety in an holomorphic complex variety M. If there exists a real 2 dimensional integrable distribution on L which is invariant by the holomorphic structure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Levi foliations; Holomorphic foliations; Singularities; Levi varieties.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100002

The sea-level highstand correlated to marine isotope stage (MIS) 7 in the coastal plain of the state of Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: LOPES,RENATO P.; DILLENBURG,SERGIO R.; SCHULTZ,CESAR L.; FERIGOLO,JORGE; RIBEIRO,ANA MARIA; PEREIRA,JAMIL C.; HOLANDA,ELIZETE C.; PITANA,VANESSA G.; KERBER,LEONARDO.
The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-lagoon depositional systems formed by successive Quaternary sea-level highstands that were correlated to marine isotope stages (MIS) 11, 9, 5 and 1, despite the scarcity of absolute ages. This study describes a sea-level highstand older than MIS 5, based on the stratigraphy, ages and fossils of the shallow marine facies found in coastal barrier (Barrier II). This facies outcrops along the banks of Chuí Creek, it is composed of fine, well-sorted quartz sand and contains ichnofossils Ophiomorpha nodosa and Rosseliasp., and molluscan shells. The sedimentary record indicates coastal aggradation followed by sea-level fall and progradation of the coastline....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barrier II; Chuí Creek; MIS 7; Pleistocene; Paleoceanography.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401573

Effects of Aliskiren, an RAAS inhibitor, on a carrageenan-induced pleurisy model of rats
Provedor de dados: 42
Autores: BAYIR,YASIN; UN,HARUN; CADIRCI,ELIF; AKPINAR,EROL; DIYARBAKIR,BUSRA; CALIK,ILKNUR; HALICI,ZEKAI.
Abstract Our aim is to investigate the potentially preventive effects of Aliskiren in a carrageenan-induced lung pleurisy model and to compare the standard anti-inflammatory agents, indomethacin and dexamethasone. The pleurisy model was induced through the injection of carrageenan (0.2 ml-%2) into the pleural cavity. After the experiment, serum and lung tissues were collected and biochemical, molecular and pathological examinations were performed. In our study, pleural inflammation decreased superoxide dismutase activity and the glutathione level and increased the malondialdehyde level in the lung of rats, while Aliskiren increased the superoxide dismutase activity and glutathione level and decreased the malondialdehyde level. In addition,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aliskiren; Cytokines; Lung injury; Oxidative stress; Pleurisy; Rat.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100801

Water retention capacity in Arenosols and Ferralsols in a semiarid area in the state of Bahia, Brazil
Provedor de dados: 42
Autores: PARAHYBA,ROBERTO DA B.V.; ARAÚJO,MARIA DO SOCORRO B. DE; ALMEIDA,BRIVALDO G. DE; ROLIM NETO,FERNANDO C.; SAMPAIO,EVERARDO V.S.B.; CALDAS,ANILDO M.
Abstract:  One of the most serious problems in areas indicated for irrigation projects in the Brazilian Northeast region is the occurrence of sandy soils, known to have low moisture retention, but occurring in strategic locations in terms of water supply and geographical situation, and which can be used for agricultural purposes. The objective of this study was to evaluate the influence of particle size distribution and porosity on the water retention capacity of sandy soils in the semiarid area of the Northeast region. Soil bulk and particle densities, total porosity (macro, meso and microporosity), field capacity, permanent wilting point and soil-water retention curve were determined in samples of surface (A) and subsurface (C or Bw) horizons of ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil-water retention curve; Microporosity; Pore-size distribution; Sandy soils.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700860

Exploring the Insecticide and Acaricide Potential of Development Regulators obtained from Restinga vegetation from Brazil
Provedor de dados: 42
Autores: FEDER,DENISE; GONZALEZ,MARCELO S.; MELLO,CÍCERO B.; SANTOS,MARCELO G.; ROCHA,LEANDRO; KELECOM,ALPHONSE; FOLLY,EVELIZE.
Abstract: As a part of our continuing search for insect and arthropod development regulators from Brazilian restinga vegetation of the Rio de Janeiro State, crude extracts, purified fractions and essential oils were submitted to screening tests seeking for biological activities on the development of the insects Rhodnius prolixus, Dysdercus peruvianus, Oncopeltus fasciatus and Rhipicephalus (Boophilus) microplus. Up to now, 102 secondary metabolites have been detected in the fractions, among them monoterpenes, sesquiterpenes and two triterpenes which were obtained from the species, Eugenia sulcata, Pilocarpus spicatus, Manilkara subsericea, Myrciaria floribunda and Zanthoxylum caribaeum. These secondary plant metabolites are considered of interest for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arthropods; Essential oil; Green pesticide; Insect pests; Insect vectors; Insect growth regulators.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100626

General optimal euclidean Sobolev and Gagliardo-Nirenberg inequalities
Provedor de dados: 42
Autores: Ceccon,Jurandir; Montenegro,Marcos.
We prove general optimal euclidean Sobolev and Gagliardo-Nirenberg inequalities by using mass transportation and convex analysis results. Explicit extremals and the computation of some optimal constants are also provided. In particular we extend the optimal Gagliardo-Nirenberg inequality proved by Del Pino and Dolbeault 2003 and the optimal inequalities proved by Cordero-Erausquin et al. 2004.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Best constants; Gagliardo-Nirenberg inequalities; Mass transportation; Convex analysis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400001

Potential of pepper plant accessions for ornamental purposes using diallel analysis
Provedor de dados: 42
Autores: PESSOA,ANGELA M.S.; RÊGO,ELIZANILDA R. DO; SANTOS,CRISTINE A.P. DOS; CARVALHO,MICHELLE G. DE; MESQUITA,JÚLIO C.P. DE; RÊGO,MAILSON M. DO.
Abstract: The genus Capsicum is cultivated in various parts of the world, with C. annuum showing high diversity and potential for ornamental purposes and genetic improvement. The aim of this work was to evaluate the combining ability and heterosis of seedling and plant traits in accessions of ornamental pepper and their hybrids. Seven accessions of C. annuum were handcrossed and twelve quantitative plant traits were evaluated. The data were subjected to analysis of variance, the Scott-Knott test and diallel analysis using Griffing’s method I (fixed model). Heterosis and its components were also determined. Non-additive effects were found for seedling height, cotyledonous leaf length and width; stem diameter and chlorophyll b content. All other traits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Heterosis; General combining ability; Specific combining ability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700870

Brazil/France Bilateral Symposium on Biodiversity
Provedor de dados: 42
Autores: DAVIDOVICH,LUIZ; BACH,JEAN-FRANÇOIS.
Tipo: Info:eu-repo/semantics/other
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600101

Terrestrial impact structures as geoheritage: an assessment method of their scientific value and its application to Brazil
Provedor de dados: 42
Autores: SÁNCHEZ,JOANA P.; BRILHA,JOSÉ B.R.
ABSTRACT Terrestrial impact structures are geological and geomorphological features with particular importance to understand the history and evolution of the planet. Impact structures are scattered around the world but in many countries these features are under threat, essentially due to anthropic factors. Impact structures with higher scientific value should be considered as geological heritage and, consequently, be subjected to geoconservation strategies. In order to select the most important impact structures to be properly conserved and managed, this paper proposes a quantitative assessment method of the scientific value of these structures. The eight Brazilian impact structures were used to test this method that has the potential to be applied to any...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geological heritage; Impact structure; Assessment; Inventory; Geoconservation; Brazil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300825

Description of the last instar larva and new contributions to the knowledge of the pupa of Dasyhelea mediomunda Minaya (Diptera, Culicomorpha, Ceratopogonidae)
Provedor de dados: 42
Autores: DÍAZ,FLORENTINA; ANJOS-SANTOS,DANIELLE; FUNES,AMPARO; RONDEROS,MARÍA M.
ABSTRACT The fourth instar larva of Dasyhelea mediomunda Minaya is described for the first time and a complete description of the pupa is provided, through use of phase-contrast microscope and scanning electron microscope. Studied specimens were collected in a pond connected to a small wetland "mallin" on the Patagonian steppe, Chubut province, Argentina.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Dasyhelea mediomunda; Immature stages; Patagonian steppe.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501625

Wall function treatment for bubbly boundary layers at low void fractions
Provedor de dados: 42
Autores: SOARES,DANIEL V.; BITENCOURT,MARCELO C; LOUREIRO,JULIANA B.R.; SILVA FREIRE,ATILA P.
Abstract The present work investigates the role of different treatments of the lower boundary condition on the numerical prediction of bubbly flows. Two different wall function formulations are tested against experimental data obtained for bubbly boundary layers: (i) a new analytical solution derived through asymptotic techniques and (ii) the previous formulation of Troshko and Hassan (IJHMT, 44, 871-875, 2001a). A modified k-e model is used to close the averaged Navier-Stokes equations together with the hypothesis that turbulence can be modelled by a linear superposition of bubble and shear induced eddy viscosities. The work shows, in particular, how four corrections must the implemented in the standard single-phase k-e model to account for the effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bubbly flow; Law of the wall; K-e; Pipe flow; Turbulence.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100573

A new genus of dipnoiformes from the Cretaceous of Brazil
Provedor de dados: 42
Autores: Toledo,Carlos E.V.; Sousa,Eliane P. de; Medeiros,Manuel A.A.; Bertini,Reinaldo J.
The Alcântara Formation, an important stratigraphic unit from the early Cenomanian of Brazil, was deposited under transitional (estuarine) conditions, and its fossil record includes fragmentary remains of plants, fishes, crocodylomorphs, pterosaurs and dinosaurs, with a noteworthy diversity of dipnoiformes tooth plates. The dipnoiformes material reported here comprises a new taxon, Equinoxiodus alcantarensis, gen. et sp. nov. Most of the identified morphotypes of continental vertebrates collected in the Alcântara Formation are similar to chronocorrelative faunas from Northern Africa, but this new genus of Dipnoiformes indicates some degree of paleogeographic isolation and endemism. This was probably caused by the widening of the equatorial Atlantic Ocean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dipnoiformes; Neoceratodontids; Equinoxiodus alcantarensis gen. et sp. nov.; Cretaceous.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400006

Incorporating electrokinetic effects in the porochemoelastic inclined wellbore formulation and solution
Provedor de dados: 42
Autores: Nguyen,Vinh X.; Abousleiman,Youname N.
The porochemoelectroelastic analytical models and solutions have been used to describe the response of chemically active and electrically charged saturated porous media such as clays, shales, and biological tissues. However, these attempts have been restricted to one-dimensional consolidation problems, which are very limited in practice and not general enough to serve as benchmark solutions for numerical validation. This work summarizes the general linear porochemoelectroelastic formulation and presents the solution of an inclined wellbore drilled in a fluid-saturated chemically active and ionized formation, such as shale, and subjected to a three-dimensional in-situ state of stress. The analytical solution to this geometry incorporates the coupled solid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drilling; Electrokinetic; Inclined wellbore; Osmotic; Poromechanics; Stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100015

Changes in the phenylalanine ammonia lyase activity, total phenolic compounds, and flavonoids in Prosopis glandulosa treated with cadmium and copper
Provedor de dados: 42
Autores: GONZÁLEZ-MENDOZA,DANIEL; TRONCOSO-ROJAS,ROSALBA; GONZALEZ-SOTO,TANIA; GRIMALDO-JUAREZ,ONECIMO; CECEÑA-DURAN,CARLOS; DURAN-HERNANDEZ,DAGOBERTO; GUTIERREZ-MICELI,FEDERICO.
ABSTRACT The aim of the present work is to evaluate the changes on the phenylalanine ammonia lyase (PAL) activity, phenolic compounds accumulation and photochemical efficiency in leaves of P. glandulosa treated with Cd2+ (0.001 M) and Cu2+ (0.52 M) concentrations for 96 h under hydroponic conditions. The results showed that only leaves treated with copper had a decrease in photochemical efficiency and leaf epidermal polyphenols in P. glandulosa leaves after 96 h of exposure. On the other hand the reverse-phase HPLC analysis revealed higher levels of phenolic compound (gallic, vanillic and caffeic acids) and flavonoids (rutin and kaempferol-3-O-glucosides) in plant leaves from Cu and Cd-treatments with respect to control plants. Finally, highest increments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Prosopis glandulosa; Flavonoids; Chlorophyll a fluorescence.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401465

Macro and micro minerals: are frozen fruits a good source?
Provedor de dados: 42
Autores: Spada,Patricia D.S.; Bortolin,Giovana V.; Prá,Daniel; Santos,Carla E.I.; Dias,Johnny F.; Henriques,João A.P.; Salvador,Mirian.
Fruits are rich in minerals, which are essential for a wide variety of metabolic and physiologic processes in the human body. The use of frozen fruits has greatly spread in the last years not only in the preparation of juices, but also as raw material for yogurts, candies, cookies, cakes, ice creams, and children's food. However, up to now there is no data about the mineral profile of frozen fruits. This is the first database to quantify the levels of minerals in 23 samples of frozen fruits, including the most used around the world and some native fruits from the Amazon rainforest in Brazil. Considering the Dietary Reference Intakes, 100g of frozen fruits can provide 0.2 to 2.8% of macro and 2.5 to 100% of microminerals for adults (31-50 years old)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Dietary recommendations; Dietary Reference Intakes; Frozen fruits; Minerals.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400008

High Postprandial Triglycerides Serum Levels: Is Obesity a Good Predictor?
Provedor de dados: 42
Autores: NOGAROTO,VIVIANE; RODRIGUES,MARCOS R.S.; VICARI,MARCELO R.; ALMEIDA,MARA C. DE; MILLÉO,FÁBIO Q.; SANTOS,FÁBIO A. DOS; ARTONI,ROBERTO F.
The aim of this study was to analyze the correlation between triglyceride (TG) serum levels in obese and non-obese patients in a simulated postprandial state. Both groups showed TG levels &lt; 150 mg/dL when fasting. After 12 h fasting, the subjects ingested a lipid overload diet and blood samples were collected. The variation between fasting and the postprandial TG peak levels were analyzed. The peak of postprandial TG levels occurred 4 h after the lipid overload in both groups. When the subjects were not fasting, the majority of non-obese subjects remained within the range of normal TG values, but the values for the obese group remained elevated. There was a significant correlation between Body Mass Index (BMI) and TG at each time point until 2 h after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body mass index; Lipid metabolism; Risk factor; ROC curve.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100437

Modern processes of palynomorph deposition at lakes of the northern region of the Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Luz,Cynthia F.P. da; Barth,Ortrud M.; Silva,Cleverson G.
Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae deposition; Campos dos Goitacazes municipality; Palynology; Pollen deposition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300016

Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts
Provedor de dados: 42
Autores: MARQUES,THALLES M.F.; MORAIS,REINALDO N.; NOBRE,FRANCISCO X.; ROCHA,JARDEL M.; GHOSH,ANUPAMA; SOARES,THIAGO ANDRÉ S.; VIANA,BARTOLOMEU C.; MACHADO,GIOVANNA; COSTA,JEAN CLAUDIO S.; MATOS,JOSÉ M.E. DE.
Abstract: Protonated titanate nanotubes (HTiNts) were synthesized using the hydrothermal method, followed by proton exchange with acid. Gold nanoparticles decorated titanate nanotubes (AuHTiNts) were obtained by the reduction of AuCl4- under vigorous stirring with an aqueous solution of HTiNts containing 1 wt% of ascorbic acid. To investigate the surface structural chemistry of the titanate and AuHTiNts, the following characterization methods were used: scanning and transmission electron microscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy and X-ray photo-electron spectroscopy. The mean internal and external diameters for titanate nanotubes were found to be 5.46 ± 0.08 nm and 8.42 ± 0.03 nm, respectively, whereas the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Titanate nanotubes; Au nanoparticles; Catalytic hydrogen production; Glycerol.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700404

Haematophagous arthropod saliva and host defense system: a tale of tear and blood
Provedor de dados: 42
Autores: Andrade,Bruno B.; Teixeira,Clarissa R.; Barral,Aldina; Barral-Netto,Manoel.
The saliva from blood-feeding arthropod vectors is enriched with molecules that display diverse functions that mediate a successful blood meal. They function not only as weapons against host's haemostatic, inflammatory and immune responses but also as important tools to pathogen establishment. Parasites, virus and bacteria taking advantage of vectors' armament have adapted to facilitate their entry in the host. Today, many salivary molecules have been identified and characterized as new targets to the development of future vaccines. Here we focus on current information on vector's saliva and the molecules responsible to modify host's hemostasis and immune response, also regarding their role in disease transmission.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saliva; Bites; Hemostasis; Host; Vector; Infection.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000400008

Carbon and oxygen isotope geochemistry of Ediacaran outer platform carbonates, Paraguay Belt, central Brazil
Provedor de dados: 42
Autores: Riccomini,Claudio; Nogueira,Afonso C.R.; Sial,Alcides N.
After the late Cryogenian glaciation the central region of Brazil was the site of extensive deposition of platformal carbonates of the Araras Group. This group includes a basal cap carbonate sequence succeeded by transgressive, deep platform deposits of bituminous lime mudstone and shale. Facies and stratigraphic data combined with carbon and oxygen isotopic analyses of the most complete section of the transgressive deposits, exposed in the Guia syncline, were used to evaluate the depositional paleoenvironment and to test the correlation of these deposits along the belt and with other units worldwide. The studied succession consists of 150 m thick tabular beds of black to grey lime mudstone and shale with predominantly negative delta13C PDB values around...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon and oxygen isotopes; Ediacaran; Araras Group; Guia Formation; Amazon Craton; Glaciation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300012

Somatic embryogenesis in Carica papaya as affected by auxins and explants, and morphoanatomical-related aspects
Provedor de dados: 42
Autores: CIPRIANO,JAMILE L.D.; CRUZ,ANA CLÁUDIA F.; MANCINI,KARINA C.; SCHMILDT,EDILSON R.; LOPES,JOSÉ CARLOS; OTONI,WAGNER C.; ALEXANDRE,RODRIGO S.
ABSTRACT The aim of this study was to evaluate somatic embryogenesis in juvenile explants of the THB papaya cultivar. Apical shoots and cotyledonary leaves were inoculated in an induction medium composed of different concentrations of 2,4-D (6, 9, 12, 15 and 18 µM) or 4-CPA (19, 22, 25, 28 and 31 µM). The embryogenic calluses were transferred to a maturation medium for 30 days. Histological analysis were done during the induction and scanning electron microscopy after maturing. For both types of auxin, embryogenesis was achieved at higher frequencies with cotyledonary leaves incubated in induction medium than with apical shoots; except for callogenesis. The early-stage embryos (e.g., globular or heart-shape) predominated. Among the auxins, best results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Juvenile explants; Maturation; Microscopic analysis; Synthetic auxins.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100385

Nutrient and phytoplankton biomass in the Amazon River shelf waters
Provedor de dados: 42
Autores: Santos,Maria L.S.; Muniz,Kátia; Barros-Neto,Benício; Araujo,Moacyr.
The Amazon River estuary is notable at the Amazon Continental Shelf, where the presence of the large amount of water originating from the Amazon during the river's falling discharge period was made evident by the low salinity values and high nutrient levels. Even so, the presence of oceanic waters in the shelf area was significant. Dissolved organic nitrogen was the predominant species of the nitrogen cycle phases, followed by total particulate nitrogen, nitrate, ammonium and nitrite. The chlorophyll a data in the eutrophic area indicated that there is sufficient nitrogen in the area to withstand productivity, though dissolved inorganic nitrogen removal processes are faster than regeneration or mineralization. The anomalous amounts of inorganic dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Continental Shelf; Nitrogen; Phosphate; Mathematical modeling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400011

Antitumor, antibiotic and antileishmanial properties of the Pyranonaphthoquinone Psychorubrin from Mitracarpus frigidus
Provedor de dados: 42
Autores: Fabri,Rodrigo L.; Grazul,Richard M.; Carvalho,Lidiane O. de; Coimbra,Elaine S.; Cardoso,Gabriele M.M.; Souza-Fagundes,Elaine M. de; Silva,Adilson D. da; Scio,Elita.
The bioactivity guided fractionation of the dichloromethane extract of Mitracarpus frigidus afforded the pyranonaphthoquinone psychorubrin. This compound, hitherto unknown in the genus Mitracarpus, had its biological activity evaluated against one panel of bacteria and two fungi, three tumor cell lines (HL60, Jurkat and MCF-7) and four Leishmania species. Its identity was confirmed unambiguously by ¹H, 13C, ¹H-COSY, IR and UV-Vis spectroscopy and mass spectrometry. Psychorubrin displayed a very promising antitumor with IC50 of 4.5, 5.6 and 1.1 µM for HL60, Jurkat and MCF-7 cell lines, respectively. Antimicrobial activity, mainly against Cryptococcus neoformans (MIC of 87.3 µM) was observed. A pronounced antileishmanial potential was also verified with IC50...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitracarpus frigidus; Psychorubrin; Pyranonaphthoquinone; Rubiaceae.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400022

Micro-structural and compositional variations of hydrothermal epidote-group minerals from a peralkaline granite, Corupá Pluton, Graciosa Province, South Brazil, and their petrological implications
Provedor de dados: 42
Autores: Vlach,Silvio R.F.
Epidote-group minerals, together with albite, quartz, fluorite, Al-poor and Fe-rich phyllosilicates, zircon, and minor oxides and sulphides, are typical hydrothermal phases in peralkaline alkali-feldspar granites from the Corupá Pluton, Graciosa Province, South Brazil. The epidote-group minerals occur as single crystals and as aggregates filling in rock interstices and miarolitic cavities. They display complex recurrent zoning patterns with an internal zone of ferriallanite-(Ce), followed by allanite-(Ce), then epidote-ferriepidote, and an external zone with allanite-(Ce), with sharp limits, as shown in BSE and X-ray images. REE patterns show decreasing fractionation degrees of LREE over HREE from ferriallanite to epidote. The most external allanite is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allanite; Epidote; Hydrothermal; Compositional variations; Peralkaline granite; Corupá Pluton; Graciosa Province.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200012

Biodiversity of the Neotropical Larginae (Hemiptera: Pyrrhocoroidea: Largidae): Description of a new genus and new species
Provedor de dados: 42
Autores: MELO,MARÍA CECILIA; DELLAPÉ,PABLO M.
Abstract: A new genus of Larginae (Largidae), Parvacinocoris, is described to include a new species from Argentina and Paraguay, and P. stehliki (Doesburg) new combination, a species previously placed in Acinocoris, previously known from Surinam and Venezuela and in this paper recorded also from Brazil, Colombia and Guatemala. This new genus is similar to Acinocoris however it may be separated by the smaller size, the shorter antennae, the immaculate abdominal sterna, the shape of the parameres, and the presence of a pair of hook‐like processes on the aedeagal conjunctiva. Photographs of dorsal and lateral habitus of both sexes as well as the male genitalia of the new species are included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parvacinocoris n. gen.; P. khuru n. sp.; P. stehliki n. comb.; New records.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700610

The largest flying reptile from Gondwana: a new specimen of Tropeognathus cf. T. mesembrinusWellnhofer, 1987 (Pterodactyloidea, Anhangueridae) and other large pterosaurs from the Romualdo Formation, Lower Cretaceous, Brazil
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A.; SAYÃO,JULIANA M.; SARAIVA,ANTÔNIO A.F.; RODRIGUES,TAISSA; OLIVEIRA,GUSTAVO; CRUZ,LILIAN A.; COSTA,FABIANA R.; SILVA,HELDER P.; FERREIRA,JENNYFER S.
A very large pterosaur (MN 6594-V) from the Romualdo Formation (Aptian/Albian), Santana Group, Araripe Basin, is described. The specimen is referred to Tropeognathus cf. T. mesembrinus mainly due to the presence of a low and blunt frontoparietal crest, the comparatively low number of teeth and the inclined dorsal part of the occipital region. Two distinct wingspan measurements for pterosaurs are introduced: the maximized wingspan (maxws), which essentially consists of doubling the addition of all wing elements and the length of the scapula or the coracoid (the smaller of the two), and the normal wingspan (nws), which applies a reducing factor (rfc) to the maximized wingspan to account for the natural flexures of the wing. The rfc suggested for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Anhangueridae; Tropeognathus; Cretaceous; Gondwana.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100113

Efficacy of Topical 5% Acyclovir-1% Hydrocortisone Cream (ME-609) for Treatment of Herpes Labialis: a systematic review
Provedor de dados: 42
Autores: ROSA,MARIA INÊS DA; SOUZA,SUÉLI L.; FARIAS,BRUNA F. DE; PIRES,PATRÍCIA D.S.; DONDOSSOLA,EDUARDO R.; REIS,MARIA EDUARDA F. DOS.
We performed a systematic review with the objective of verifying the efficacy of topical use 5% Acyclovir-1% Hydrocortisone cream compared to the placebo group for herpes simplex labialis treatment. We performed a literature search using MEDLINE, Embase, BIOSIS, LILACS, Scopus, Grey literature, the Cochrane Central Register of Controlled Trials, the ISI Web of Science and IBECS from 1990 to June 2014. We reported the outcomes using relative risk (RR) with 95% confidence intervals. The literature search yielded 180 potentially relevant publications. Reviews of the reference lists yielded two further citations. Among these papers, two were considered eligible for inclusion in this review. Both trials included 1,213 patients. A meta-analysis of these studies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acyclovir; Herpes Labialis; Hydrocortisone; ME-609; Systematic Review.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301415

A reassessment of the role of serotonergic system in the control of feeding behavior
Provedor de dados: 42
Autores: Medeiros,Magda A.; Costa-e-Sousa,Ricardo H.; Olivares,Emerson L.; Côrtes,Wellington S.; Reis,Luís C.
The role of serotonergic system in the feeding behaviorwas appraised by electrolytic lesions in the dorsal raphe nucleus (DRN) and administration of para-chlorophenylalanine (PCPA, 3 mg/5 mul, icv). Chronic evaluations were accomplished through 120 and 360 days in PCPA-injected and DRN-lesioned rats, respectively. Acute food intake was evaluated in fasted rats and submitted to injection of PCPA and hydroxytryptophan (LHTP, 30 mg/kg, ip). DRN-lesioned rats exhibited 22-80% increase in food intake up to sixth month, whereas the obesity was evident and sustained by whole period. In PCPA-injected rats was observed an initial increase in the food intake followed by hypophagy from 25th to 30th day and a transitory increase of body weight from 5th to 60th day. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food ingestion; Serotonergic system; Dorsal raphe nucleus; Electrolytic lesion; Para-chlorophenylalanine; Obesity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100008

Evaluation of the catalytic activity of lipases immobilized on chrysotile for esterification
Provedor de dados: 42
Autores: Silva,Jane E. S.; Jesus,Paulo C.
In the present work, the ester synthesis in organic media catalyzed by lipases immobilized on chrysotile was studied. Lipases of different sources (Mucor javanicus, Pseudomonas cepacia, Rhizopus oryzae, Aspergillus niger and Candida rugosa) were immobilized on chrysotile, an inexpensive magnesium silicate, and used for esterification of hexanoic, octanoic and lauric acid with methanol, ethanol, 1-butanol and 1-octanol at 25ºC in hexane as solvent. The best results were obtained with Mucor javanicus lipase and lauric acid giving yields of 62-97% of ester.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrysotile; Lipases; Esters.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200003

Alcohol and atherosclerosis
Provedor de dados: 42
Autores: DA LUZ,PROTASIO L.; COIMBRA,SILMARA R.
Atherosclerosis is manifested as coronary artery disease (CAD), ischemic stroke and peripheral vascular disease. Moderate alcohol consumption has been associated with reduction of CAD complications. Apparently, red wine offers more benefits than any other kind of drinks, probably due to flavonoids. Alcohol alters lipoproteins and the coagulation system. The flavonoids induce vascular relaxation by mechanisms that are both dependent and independent of nitric oxide, inhibits many of the cellular reactions associated with atherosclerosis and inflammation, such as endothelial expression of vascular adhesion molecules and release of cytokines from polymorphonuclear leukocytes. Hypertension is also influenced by the alcohol intake. Thus, heavy alcohol intake is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alcohol; Coronary heart disease; Atherosclerosis; Stroke; Wine.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100006

Animal models in biological and biomedical research - experimental and ethical concerns
Provedor de dados: 42
Autores: ANDERSEN,MONICA L.; WINTER,LUCILE M.F.
ABSTRACT Animal models have been used in experimental research to increase human knowledge and contribute to finding solutions to biological and biomedical questions. However, increased concern for the welfare of the animals used, and a growing awareness of the concept of animal rights, has brought a greater focus on the related ethical issues. In this review, we intend to give examples on how animals are used in the health research related to some major health problems in Brazil, as well as to stimulate discussion about the application of ethics in the use of animals in research and education, highlighting the role of National Council for the Control of Animal Experimentation (Conselho Nacional de Controle de Experimentação Animal - CONCEA) in these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal use; Biology; Ethics; Research.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200701

The partitioning of food resources between two rodents in the subtropical region of southern Brazil
Provedor de dados: 42
Autores: ESPINELLI,FÁBIO P.; CORRÊA,FABIANO; COLARES,ELTON P.; COLARES,IONI G.
ABSTRACT The capybara (Hydrochoerus hydrochaeris) and nutria (Myocastor coypus) are herbivorous semi-aquatic rodents. Although these rodents occur in sympatry in southern South America, little is known about how the two species interact in relationship to food resources. In this context, the aim of this study was to analyze the food resource overlap, the feeding strategy and the diversity of the diet of capybaras and nutria. A micro-histological analysis of feces was used to study the diets. A total of 48 plant species belonging to 10 families were identified in the diet of H. hydrochaeris, and a total of 49 species belonging to 14 families were identified in the diet of M. coypus. According to the Amundsen graphical method, both rodents adopted a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet overlap; Feeding strategy; Herbivores; Micro-histological analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100191

Modeling of stem form and volume through machine learning
Provedor de dados: 42
Autores: SCHIKOWSKI,ANA B.; CORTE,ANA P.D.; RUZA,MARIELI S.; SANQUETTA,CARLOS R.; MONTAÑO,RAZER A.N.R.
Abstract Taper functions and volume equations are essential for estimation of the individual volume, which have consolidated theory. On the other hand, mathematical innovation is dynamic, and may improve the forestry modeling. The objective was analyzing the accuracy of machine learning (ML) techniques in relation to a volumetric model and a taper function for acácia negra. We used cubing data, and fit equations with Schumacher and Hall volumetric model and with Hradetzky taper function, compared to the algorithms: k nearest neighbor (k-NN), Random Forest (RF) and Artificial Neural Networks (ANN) for estimation of total volume and diameter to the relative height. Models were ranked according to error statistics, as well as their dispersion was verified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artificial intelligence; Data mining; Random forest; ANN.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703389

Supramolecular chemistry and technology
Provedor de dados: 42
Autores: TOMA,HENRIQUE E.
Supramolecular chemistry deals with the association of several chemical species, in an organized way and according to well defined purposes. Based on a molecular engineering approach, supramolecular structures can be designed from pre-formed building blocks, providing a promising route from chemistry to molecular nanotechnology. New supramolecular systems have been assembled in our laboratory with the use of bridging unities such as tetrapyridylporphyrins, porphyrazines and polypyrazines, connecting transition metal complexes and clusters. These systems display a very exciting electrochemical and catalytic behavior, and interact with DNA, generating ¹O2 and leading to efficient oxidative clivage for photodynamic terapy applications. Molecular interfaces...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Supramolecular chemistry; Polynuclear complexes; Molecular device.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100002

Analysis of tectonic-controlled fluvial morphology and sedimentary processes of the western Amazon Basin: an approach using satellite images and digital elevation model
Provedor de dados: 42
Autores: Silva,Clauzionor L.; Morales,Norberto; Crósta,Alvaro P.; Costa,Solange S.; Jiménez-Rueda,Jairo R.
An investigation of the tectonic controls of the fluvial morphology and sedimentary processes of an area located southwest of Manaus in the Amazon Basin was conducted using orbital remote sensing data. In this region, low topographic gradients represent a major obstacle for morphotectonic analysis using conventional methods. The use of remote sensing data can contribute significantly to overcome this limitation. In this instance, remote sensing data comprised digital elevation model (DEM) acquired by the Shuttle Radar Topographic Mission (SRTM) and Landsat Thematic Mapper images. Advanced image processing techniques were employed for enhancing the topographic textures and providing a three-dimensional visualization, hence allowing interpretation of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphotectonics; Morphostructural; Neotectonics; Amazon Basin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400010

Animal-based medicines used in ethnoveterinary practices in the semi-arid region of Northeastern Brazil
Provedor de dados: 42
Autores: Souto,Wedson M.S.; Barboza,Raynner R.D.; Rocha,Michelle S.P.; Alves,Rômulo R.N.; Mourão,José S.
This work documents the zootherapeutic practices in Ethnoveterinary medicine (EVM) of Pedra Lavrada (6°45'S, 36°28'W), Northeastern Brazil. We interviewed 23 people (22 men and 1 woman), who provided information on animal species used as remedies, body parts used to prepare the remedies, and illnesses for which the remedies were prescribed. We calculated the use-value to determine the most important species. Interviewees cited 11 animal taxa. The main species mentioned were ram - Ovis aries (UV=0.89), crab-eating fox - Cerdocyon thous (UV=0.79), common green iguana - Iguana iguana (UV=0.79), and South American rattlesnake - Caudisona durissa (Linnaeus, 1758) (UV=0.74). The most frequently cited treatments concerned to inflammatory and dermatological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethnoveterinary; Livestock; Traditional knowledge; Traditional remedies; Zootherapy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300009

Antibacterial and cytotoxicity activities and phytochemical analysis of three ornamental plants grown in Mexico
Provedor de dados: 42
Autores: RÍOS-CHÁVEZ,PATRICIA; PEREZ-GONZALEZ,JORDY; SALGADO-GARCIGLIA,RAFAEL; RAMÍREZ-CHÁVEZ,ENRIQUE; MOLINA-TORRES,JORGE; MARTINEZ-TRUJILLO,MIGUEL; CARREON-ABUD,YAZMIN.
Abstract: This study evaluates the antibacterial, cytotoxic activities, and phytochemical composition, of Callistemon citrinus, Hibiscus rosa-sinensis and Plumbago auriculata leaves and flowers, three ornamental plants in Mexico. However, in other countries offers a range of other uses. Ethanol extracts of C. citrinus leaf and flower presented stronger antibacterial activity than the extracts obtained from the other two plants. C. citrinus leaf showed low cytotoxicity (LC50 &lt;600 µg/mL) on the brine shrimp test, whereas the ethanol extracts of H. rosa-sinensis and P. auriculata leaves showed no cytotoxic activity. Flower extracts obtained from the three plants did no exhibit cytotoxicity. GC-MS analysis revealed that the ethanol extract of P. auriculata...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial; Artemia salina; Callistemon citrinus; Cytotoxic; Lupeol.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300611

2,3,8-Trisubstituted Quinolines with Antimalarial Activity
Provedor de dados: 42
Autores: MARTINEZ,PABLO D.G.; KRAKE,SUSANN H.; POGGI,MAITIA L.; CAMPBELL,SIMON F.; WILLIS,PAUL A.; DIAS,LUIZ C.
ABSTRACT Combination therapy drugs are considered a fundamental way to control malaria as it mimimizes the risk of emergence of resistance to the individual partner drugs. Consequently, this type of therapy constitutes a driving force for the discovery of new drugs with different modes of action, since this will provide options for combining different drugs to achieve the optimum antimalarial treatment. In this context, a 2,3,8-trisubstitued quinoline compound was found in a high throughput screen (HTS) to show an excellent inhibition of P. falciparum NF54 (IC50 = 22 nM) and low cytotoxicity. We performed a detailed evaluation of the substituents to improve the metabolic stability and solubility liabilities of the original hit and identified derivatives...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimalarial activity; Trisubstituted quinoline; SAR; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301215

Constant mean curvature surfaces with circular boundary in R³
Provedor de dados: 42
Autores: Hinojosa,Pedro A.
In this work we deal with surfaces immersed in R³ with constant mean curvature and circular boundary. We improve some global estimates for area and volume of such immersions obtained by other authors. We still establish the uniqueness of the spherical cap in some classes of cmc surfaces.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surfaces with boundary; Constant mean curvature; Spherical caps; Area; Volume.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100001

Morphometric differences of Microgramma squamulosa (Kaulf.) de la Sota (Polypodiaceae) leaves in environments with distinct atmospheric air quality
Provedor de dados: 42
Autores: ROCHA,LEDYANE D.; COSTA,GUSTAVO M. DA; GEHLEN,GÜNTHER; DROSTE,ANNETTE; SCHMITT,JAIRO L.
Plants growing in environments with different atmospheric conditions may present changes in the morphometric parameters of their leaves. Microgramma squamulosa (Kaulf.) de la Sota is a neotropical epiphytic fern found in impacted environments. The aims of this study were to quantitatively compare structural characteristics of leaves in areas with different air quality conditions, and to identify morphometric parameters that are potential indicators of the effects of pollution on these plants. Fertile and sterile leaves growing on isolated trees were collected from an urban (Estância Velha) and a rural (Novo Hamburgo) environment, in Rio Grande do Sul, Brazil. For each leaf type, macroscopic and microscopic analyses were performed on 192 samples collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atmospheric pollution; Bioindicator; Epiphytism; Fern; Leaf anatomy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301137

Characterization of the myenteric neuronal population and subpopulation of the duodenum of adult wistar rat fed with hypoproteic chow
Provedor de dados: 42
Autores: Sant'Ana,Débora M.G.; Araújo,Eduardo J.A.; Ramos,Diego H.; Hermes-Uliana,Catchia; Natali,Maria Raquel M.
The effects of severe protein malnutrition (4%) on myenteric neurons of Wistar rat duodenum, in relation to a standard 22%-protein diet for rodents, were assessed in this study. Segments of the duodenum from 10 rats from each nutritional group were submitted to the elaboration of whole mounts - 5 stained with Giemsa to determine the total population of myenteric neurons and the others stained by a histochemical method to detect nervous cells through the NADPH-diaphorase enzyme activity for studying the subpopulation of nitrergic neurons. The area of 100 neurons per animal, totalizing 2,000 neurons, were randomly measured by using the Image Pro-Plus®software. Malnourished rats presented 34.38% lower body weight and 10.60% duodenum length reduction when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enteric nervous system; Malnutrition; Myenteric plexus; Nitrergic neurons.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300022

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain
Provedor de dados: 42
Autores: Philippsen,Juliana S.; Hauser,Marília; Benedito,Evanilde.
This study investigated the isotopic niches of two fish species, one exotic and one native. It was hypothesized that these species would show little or no isotopic niche overlap. This hypothesis was tested with the isotopic niche concept and the trophic Layman's metrics. A considerable isotopic niche overlap was observed between the species, mainly for the exotic that showed the greater percentage of overlapping, indicating an interspecific competition for food resources. Layman's metrics also showed this species probably exploits a more specific array of food resources when compared with the native species. The native species probably has the ability to exploit a wider array of resources, highlighted by the higher values given for the Layman's metrics....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Hoplias sp1; Hoplias sp2; Layman's metrics; Trophic interactions.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200825

New Holocene pollen records from the Brazilian Caatinga
Provedor de dados: 42
Autores: MEDEIROS,VANDA B. DE; OLIVEIRA,PAULO E. DE; SANTOS,RUDNEY A.; BARRETO,ALCINA M.F.; OLIVEIRA,MARCELO A.T. DE; PINAYA,JORGE L.D.
Abstract We present two pollen diagrams from the semi-arid Caatinga of the Catimbau National Park, in Pernambuco and from a Mauritia palm forest in the Caatinga/Cerrado ecotone of southern Piauí, NE Brazil, spanning the last 10,000 cal. yrs BP and the last 1,750 cal yrs BP, respectively. These two records contain a signature of the local vegetation and permit the correlation of the pollen signal with regional climatic changes. The Catimbau record shows Zizyphus sp., a typical Caatinga taxon, in all three pollen zones indicating regional Caatinga vegetation and the predominance of local arboreal taxa adapted to high humidity from 10,000 to ca. 6,000 cal. yrs BP with a gradual tendency towards drier conditions revealed by a deposition hiatus between 6,000 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleoclimatology; Palynology; Pernambuco; Piauí; Caatinga vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502011

Harvesting Season and Botanical Origin Interferes in Production and Nutritional Composition of Bee Pollen
Provedor de dados: 42
Autores: NEGRÃO,ADRIANA F.; ORSI,RICARDO O.
ABSTRACT We aimed to evaluate the frequency of bee pollen production, its botanical origin and chemical composition when collected in different seasons. Our results indicate that higher proteins (22.80 ± 3.09%) and flavonoids (2789.87 ± 1396.00 μg 100g-1) levels were obtained in the winter season, which also showed greater pollen production (134.50 ± 35.70 grams) and predominance of the Myrtaceae family. As for spring we found high concentrations of lipids (4.62 ± 2.26%) and low ash content (2.22 ± 0.39%). Regarding the amino acid composition and vitamin C content, we found no differences between the averages throughout the seasons. Our results highlight the importance of understanding not only the botanical origin and the chemical composition of bee...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Bee flora; Bee nutrition; Seasonality; Protein content.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100325

Feline heartworm (Dirofilaria immitis) infection: first case report of serological diagnosis in Brazil, confirmed by molecular assay
Provedor de dados: 42
Autores: PEREIRA,BARBARA B.; BASTOS,BETHÂNIA F.; KEIDEL,LUCAS; LELES,DANIELA; BRENER,BEATRIZ.
Abstract The clinical importance of heartworm infection in cats has indeed increased in recent years. Dirofilaria immitis infection has been reported worldwide in cats and continues to be regularly diagnosed in endemic areas. The diagnosis can be overlooked easily, especially in Brazil, where there is not a specific feline immunodiagnostic test, forcing the veterinarians to use a test made for the canine host. In 2015, a 10-year-old female neutered cat was diagnosed with D. immitis using an antigen serological test, based on imunocromatography and designed for dogs. The modified Knott test was negative. As the disease progressed, the cat showed clinical signals of respiratory distress, such as dyspnoea and polypnea in addition to prostration and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cat; Parasite; Dirofilariasis; Immunodiagnosis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502293

Behavior and identification of ephemeral sand dunes at the backshore zone using video images
Provedor de dados: 42
Autores: GUIMARÃES,PEDRO V.; PEREIRA,PEDRO S.; CALLIARI,LAURO J.; ELLIS,JEAN T.
ABSTRACT The backshore zone is transitional environment strongly affected by ocean, air and sand movements. On dissipative beaches, the formation of ephemeral dunes over the backshore zone plays significant contribution in the beach morphodynamics and sediment budget. The aim of this work is to describe a novel method to identify ephemeral dunes in the backshore region and to discuss their morphodynamic behavior. The beach morphology is identified using Argus video imagery, which reveals the behavior of morphologies at Cassino Beach, Rio Grande do Sul, Brasil. Daily images from 2005 to 2007, topographic profiles, meteorological data, and sedimentological parameters were used to determine the frequency and pervasiveness of these features on the backshore....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeolian sand transport; Argus; Beach processes; Incipient dunes; Remote sensing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401357

Ability of Allium cepa L. root tips and Tradescantia pallida var. purpurea in N-nitrosodiethylamine genotoxicity and mutagenicity evaluation
Provedor de dados: 42
Autores: Rainho,Claudia R. de; Kaezer,Andréa; Aiub,Claudia A.F.; Felzenszwalb,Israel.
N-nitroso compounds, such as N-nitrosodiethylamine (NDEA), can be formed by the reaction of secundary amines with nitrosating agents, and are suspected to be involved in tumors in humans. NDEA has been considered a weak carcinogen in genotoxic assays probably due to the inefficient nitrosamine activation system that is used and/or to the efficient repair system. In this work, we evaluated the sensibility of Allium cepa L. root tips and Tradescantia stamen hair mutation assay (Trad-SH) using Tradescantia pallida var. purpurea for NDEA (0.1; 0.5; 5 and 25mM) genotoxicity and mutagenicity induction. Allium cepa L. was treated with different NDEA concentrations for 3h, for 3 consecutive days, including negative control (distilled water) and positive control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Genotoxicity; Mutagenicity; N-nitrosodiethylaine; Tradescantia pallida var. purpurea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400015

Current Antimalarial Therapies and Advances in the Development of Semi-Synthetic Artemisinin Derivatives
Provedor de dados: 42
Autores: PINHEIRO,LUIZ C.S.; FEITOSA,LÍVIA M.; SILVEIRA,FLÁVIA F. DA; BOECHAT,NUBIA.
ABSTRACT According to the World Health Organization, malaria remains one of the biggest public health problems in the world. The development of resistance is a current concern, mainly because the number of safe drugs for this disease is limited. Artemisinin-based combination therapy is recommended by the World Health Organization to prevent or delay the onset of resistance. Thus, the need to obtain new drugs makes artemisinin the most widely used scaffold to obtain synthetic compounds. This review describes the drugs based on artemisinin and its derivatives, including hybrid derivatives and dimers, trimers and tetramers that contain an endoperoxide bridge. This class of compounds is of extreme importance for the discovery of new drugs to treat malaria.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malaria; Plasmodium falciparum; Artemisinin; Hybrid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301251

In vitro generation of human monocyte-derived dendritic cells methodological aspects in a comprehensive review
Provedor de dados: 42
Autores: CECHIM,GIOVANA; CHIES,JOSÉ A.B.
Abstract: Dendritic cells (DCs) initiate and shape both innate and adaptive immune responses. They are specialized in antigen presentation to naive T cells, thereby orchestrating the T cell immune responses. Human peripheral blood and tissues contain several subsets of phenotypically and functionally distinct DCs, which promote interactions between the external environment and lymphoid organs. Because of the difficulty in purifying these cells, in vitro studies only became more frequent when Frederica Sallusto and Antonio Lanzavecchia developed a method to generate DCs from blood monocytes in vitro. Nowadays a wide range of biotechnological innovations has allowed the study of DCs and their precursors in the most diverse situations faced by the immune...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytokines; Dendritic cell; Differentiation; Monocytes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700614

Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil
Provedor de dados: 42
Autores: BITTAR,VANESSA T.; REZENDE,CARLOS E.; KEHRIG,HELENA A.; BENEDITTO,ANA PAULA M. DI.
The trophic transfer of total mercury (THg) and its bioaccumulation from prey species to the predator fish Trichiurus lepturus was analysed in coastal waters of southeastern Brazil to evaluate the trace element dynamic in this predator-prey system. The isotopic (δ13C and δ15N) relation between this predator and its prey allowed inferences on prey assimilation and predator feeding habits. The THg increment varied from 4.5 to 19.5 times between prey and predator, with a biomagnification power of 0.59. The prey species could be divided into three groups regarding δ15N values: i) 13.6 to 13.2‰ (juvenile conspecifics, Pellona harroweri, and Peprilus paru); ii) 12.5 to 11.8‰ (Chirocentrodon bleekerianus, Lycengraulis grossidens, and Dorytheuthis plei); and iii)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mercury; Predator-prey system; Southeastern Brazil; Stable isotopes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300801

Multivariate optimization of a method for antimony determination by hydride generation atomic fluorescence spectrometry in hair samples of patients undergoing chemotherapy against Leishmaniasis
Provedor de dados: 42
Autores: CARDOZO,MANUELLE C.; CAVALCANTE,DANNUZA D.; SILVA,DANIEL L.F.; SANTOS,WALTER N.L. DOS; BEZERRA,MARCOS A.
ABSTRACT A method was developed for determination of total antimony in hair samples from patients undergoing chemotherapy against Leishmaniasis based on the administration of pentavalent antimonial drugs. The method is based on microwave assisted digestion of the samples in a pressurized system, reduction of Sb5+ to Sb3+ with KI solution (10% w/v) in ascorbic acid (2%, w/v) and its subsequent determination by hydride generation atomic fluorescence spectrometry (HG-AFS). The proportions of each component (HCl, HNO3 and water) used in the digestion were studied applying a constrained mixtures design. The optimal proportions found were 50% water, 25% HNO3 and 25% HCl. Variables involved in the generation of antimony hydride were optimized using a Doehlert...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leishmaniasis; Antimony; Hair; HG-AFS; Multivariate optimization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401179

Autophagy protects against neural cell death induced by piperidine alkaloids present in Prosopis juliflora (Mesquite)
Provedor de dados: 42
Autores: SILVA,VICTOR D.A.; CUEVAS,CARLOS; MUÑOZ,PATRICIA; VILLA,MONICA; AHUMADA-CASTRO,ULISES; HUENCHUGUALA,SANDRO; SANTOS,CLEONICE C. DOS; ARAUJO,FILLIPE M. DE; FERREIRA,RAFAEL S; SILVA,VANESSA B. DA; SILVA,JULIANA H.C. E; SOARES,ÉRICA N.; VELOZO,EUDES S.; SEGURA-AGUILAR,JUAN; COSTA,SILVIA L.
ABSTRACT Prosopis juliflora is a shrub that has been used to feed animals and humans. However, a synergistic action of piperidine alkaloids has been suggested to be responsible for neurotoxic damage observed in animals. We investigated the involvement of programmed cell death (PCD) and autophagy on the mechanism of cell death induced by a total extract (TAE) of alkaloids and fraction (F32) from P. juliflora leaves composed majoritary of juliprosopine in a model of neuron/glial cell co-culture. We saw that TAE (30 µg/mL) and F32 (7.5 µg/mL) induced reduction in ATP levels and changes in mitochondrial membrane potential at 12 h exposure. Moreover, TAE and F32 induced caspase-9 activation, nuclear condensation and neuronal death at 16 h exposure. After 4 h,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Programmed cell death; Autophagy; Glial cells; Neurons; Piperidine alkaloids; Prosopis juliflora.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100247

The evidence for hippocampal long-term potentiation as a basis of memory for simple tasks
Provedor de dados: 42
Autores: Izquierdo,Iván; Cammarota,Martín; Silva,Weber C. Da; Bevilaqua,Lia R.M.; Rossato,Janine I.; Bonini,Juliana S.; Mello,Pamela; Benetti,Fernando; Costa,Jaderson C.; Medina,Jorge H.
Long-term potentiation (LTP) is the enhancement of postsynaptic responses for hours, days or weeks following the brief repetitive afferent stimulation of presynaptic afferents. It has been proposed many times over the last 30 years to be the basis of long-term memory. Several recent findings finally supported this hypothesis: a) memory formation of one-trial avoidance learning depends on a series of molecular steps in the CA1 region of the hippocampus almost identical to those of LTP in the same region; b)hippocampal LTP in this region accompanies memory formation of that task and of another similar task. However, CA1 LTP and the accompanying memory processes can be dissociated, and in addition plastic events in several other brain regions(amygdala,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Long-term potentiation; Hippocampus; Declarative memory; Aversive memory.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100007

Reproduction and management of the mangrove crab Ucides cordatus (Crustacea, Brachyura, Ucididae) at Iguape, São Paulo, Brazil
Provedor de dados: 42
Autores: SANT'ANNA,BRUNO S.; BORGES,ROBERTO P.; HATTORI,GUSTAVO Y.; PINHEIRO,MARCELO A. A.
The mangrove crab Ucides cordatus is one of the most exploited crustaceans in Brazil. The present study investigated the breeding season of this species and the period of the “andada” phenomenon, when the crabs are active outside their burrows and perform agonistic behaviors. Furthermore related them to environmental factors, in a mangrove on the coast of Brazil, with inferences about management of this crab. The crabs reproduced from October through February. The “andada” occurred from November through February, with typical characteristics in the first two months, during the full and new moon periods, and was influenced positively by the air and soil temperature, luminosity, and tidal amplitude, and negatively by salinity. Based on the results of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Crab; Mangrove; Management; Reproduction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301411

Sequential sampling plan for fruit fly species of the Genus Anastrepha (Diptera: Tephritidae) in guava orchards
Provedor de dados: 42
Autores: NICÁCIO,JOSÉ; OLIVEIRA,ISAIAS DE; UCHOA,MANOEL A.; FACCENDA,ODIVAL; ABOT,ALFREDO R.; FERNANDES,MARCOS G.; GARCIA,FLÁVIO R.M.
Abstract This study aimed to elaborate a sequential sampling plan for Anastrepha species in commercial orchards of guava Psidium guajava Novo Milênio cultivar. Samplings were carried out in three orchards in the State of Mato Grosso do Sul. Fruit flies were sampled for 23 weeks. Data were subjected to the sequential probability ratio test. We adopted the mean of 0.3 Anastrepha individuals for the safety level and 0.7 for the control level and the observed frequency was adjusted to the negative binomial expected frequency (Bn) for the equation of the line. The condition of adopting a control method recommended by S1 = 6.5554 + 0.5362n was observed in the upper line. In turn, the lower line, which does not require the use of a control method, is defined by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fruit farming; Decision making; Population monitoring; Integrated pest management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703607

Estimating vertical and lateral pressures in periodically structured montmorillonite clay particles
Provedor de dados: 42
Autores: Narsilio,Guillermo A.; Smith,David W.; Pivonka,Peter.
Given a montmorillonitic clay soil at high porosity and saturated by monovalent counterions, we investigate the particle level responses of the clay to different external loadings. As analytical solutions are not possible for complex arrangements of particles, we employ computational micromechanical models (based on the solution of the Poisson-Nernst-Planck equations) using the finite element method, to estimate counterion and electrical potential distributions for particles at various angles and distances from one another. We then calculate the disjoining pressures using the Van't Hoff relation and Maxwell stress tensor. As the distance between the clay particles decreases and double-layers overlap, the concentration of counterions in the micropores among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clay; Maxwell tensor; Poisson-Nernst-Planck equation; Pore-scale; Swelling; Van't Hoff law.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100003

Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeografic Province that produce monolete spores and its systematic implications (I): Blotiella lindeniana , Histiopteris incisa and Paesia glandulosa
Provedor de dados: 42
Autores: YAÑEZ,AGUSTINA; MARQUEZ,GONZALO J.; MORBELLI,MARTA A.
ABSTRACT The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and wall structure of Blotiella lindeniana, Histiopteris incisa and Paesia glandulosa from the Paranaense Phytogeographic Province were studied using light microscope, and scanning and transmission electron microscope. The exospore has two layers and, according to the species, the exospore surface bears pila, echinae, verrucae, bacula and tubercles. The perispore has two or three layers and its surface is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ferns; Morphology; South America; Sporoderm; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602731

Microbial, physical and chemical properties of irrigation water in rice fields of Southern Brazil
Provedor de dados: 42
Autores: RECHE,MARIA HELENA L.R.; MACHADO,VILMAR; SAUL,DANILO A.; MACEDO,VERA R.M.; MARCOLIN,ELIO; KNAAK,NEIVA; FIUZA,LIDIA M.
ABSTRACT This paper presents the results of the statistical analysis of microbiological, physical and chemical parameters related to the quality of the water used in rice fields in Southern Brazil. Data were collected during three consecutive crop years, within structure of a comprehensive monitoring program. The indicators used were: potential hydrogen, electrical conductivity, turbidity, nitrogen, phosphorus, potassium, calcium, total and fecal coliforms. Principal Component and Discriminant Analysis showed consistent differences between the water irrigation and drainage, as the temporal variation demonstrated a clear reduction in the concentration of most of the variables analyzed. The pattern of this reduction is not the same in the two regions - that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agrosystems; Irrigation; Rice field; Spatial variation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100361

Late quaternary dynamics in the Madeira river basin, southern Amazonia (Brazil), as revealed by paleomorphological analysis
Provedor de dados: 42
Autores: Hayakawa,Ericson H.; Rossetti,Dilce F.
Ancient drainage systems are being increasingly documented in the Amazon basin and their characterization is crucial for reconstructing fluvial evolution in this area. Fluvial morphologies, including elongate belts, are well preserved along the Madeira River. Digital Elevation Model from the Shuttle Radar Topography Mission favored the detection of these features even where they are covered by dense rainforest. These paleomorphologies are attributed to the shifting position of past tributaries of the Madeira River through avulsions. These radial paleodrainage networks produced fan-shaped morphologies that resemble distributary megafans. Distinguishing avulsive tributary systems from distributary megafans in the sedimentary record is challenging. Madeira´s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleochannels; Amazon Basin; Madeira river; Remote sensing; Climate; Tectonics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100029

Diversity and seasonality of Scarabaeinae (Coleoptera: Scarabaeidae) in forest fragments in Santa Maria, Rio Grande do Sul, Brazil
Provedor de dados: 42
Autores: DA SILVA,PEDRO G.; VAZ-DE-MELLO,FERNANDO Z.; DI MARE,ROCCO A.
Scarabaeinae specimens were collected with the use of pitfall traps      baited with human excrement, rotten meat and rotting banana, between May 2009      and April 2010, in three forest fragments in Santa Maria, Rio Grande do Sul,      Brazil: ‘Morro do Elefante’ (MOEL), ‘Morro do Cerrito’ (MOCE) and ‘Campus da      Universidade Federal de Santa Maria’ (UFSM). A total of 19,699 individuals      belonging to 33 species were collected. Canthidium aff.       trinodosum Boheman, 1858, Canthon latipes      Blanchard, 1845, Dichotomius assifer (Eschscholtz 1822),       Eurysternus caribaeus (Herbst 1789),       Canthidium sp. and Canthon lividus      Blanchard, 1845, were the most abundant species. MOEL showed the greatest      richness, MOCE the greatest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Dung beetles; Southern Brazil; Species richness; Temporal distribution.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200679

Gap junctions are involved on the migration of postnatal subventricular zone cells
Provedor de dados: 42
Autores: MENEZES,JOÃO R.L.; FRÓES,MARIA M.; MARINS,MONICA M.; MOURA NETO,VIVALDO.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300030

Insects galls of Pantanal areas in the State of Mato Grosso do Sul, Brazil: characterization and occurrence
Provedor de dados: 42
Autores: ASCENDINO,SHARLENE; MAIA,VALÉRIA C.
ABSTRACT Two Pantanal areas were investigated in Corumbá, Mato Grosso do Sul. The field works were carried out in five trails, in August and December/2011 and April/2012. Seventy-six gall morphotypes were found in 52 host plants, 22 of them were identified at species level and 30 at genus. Fabaceae, Myrtaceae and Sapindaceae were the plant families with the greatest richness of gall. Leaves were the plant organ with the greatest gall richness. Six gall shapes were found - globoid, lenticular, fusiform, cylindrical, conical, and marginal roll. The three first were the most common. Five colors were observed - green, brown, red, yellow, and black. Green and brown predominated. Most were glabrous and one-chambered. These features have been indicated in several...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Associated fauna; Forest capões; Gall richness; Host plants; Riparian forest.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401543

Shamanism or science?
Provedor de dados: 42
Autores: GOTTLIEB,OTTO R.; BORIN,MARIA RENATA DE M.B.
The interconnection of the three organismic levels, metabolism, morphology, and biogeography, can now be amplified into a multipart architecture, introducing plant bioactivity through ethnobotany-oriented descriptions. Only via such an integrative model, the diverse organismic levels can be connected within a more holistic, realistic scheme. Construction of qualitative and quantitative models via evolutionarily conceived implantation into dahlgrenograms and Sporne indices, allows ethnobotany to acquire predictive validity. The coherence of such systems was demonstrated by comparison of the vast ethnobotanical Brazilian database by Pio Corrêa with relatively very minute databases referring to three Amazonian Indian societies.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethnobotany; Angiosperms; Medicinal species; Edible species; Systematic trends; Evolutionary trends; Chácobo; Kayapó; Ka'apor.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100010

Recognition memory and DNA damage in undernourished young rats
Provedor de dados: 42
Autores: MOLZ,PATRÍCIA; ELLWANGER,JOEL H.; ZENKNER,FERNANDA F.; CAMPOS,DEIVIS DE; PRÁ,DANIEL; PUTZKE,MARISA T.L.; FRANKE,SILVIA I.R.
ABSTRACT This study evaluated the recognition memory and the levels of DNA damage (blood and hippocampus) in undernourished young Wistar rats. The experiment was conducted along 14-week with rodents divided in control group (CG, n=8) and undernourished group (UG, n=12) which was submitted to caloric restriction. Nutritional status for undernutrition was defined by Body Mass Index (BMI) ≤0.45g/cm2 and by weighting the organs/tissue (liver, spleen, intestine, peritoneal fat, kidney and encephalon). The Novel Object Recognition Test assessed recognition memory and the Comet Assay evaluated the levels of DNA damage. Student t test, 2-way ANOVA and Pearson's correlation analysis were used and the significance level was of p&lt;0.05. The UG showed lower BMI and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA damage; Memory; Nutritional status; Undernutrition; Wistar rats.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501863

The Role of the Humic Substances in the Fractioning of Heavy Metals in Rodrigo de Freitas Lagoon, Rio de Janeiro - Brazil
Provedor de dados: 42
Autores: FONSECA,ESTEFAN M. DA; BAPTISTA NETO,JOSÉ A.; MCALISTER,JOHN; SMITH,BERNARD; FERNANDEZ,MARCOS A.; BALIEIRO,FABIANO C.
One of the main results of the processes related to urbanization is the contamination of the adjacent water bodies. Inserted in this context, the Rodrigo de Freitas lagoon is situated in the south zone of the city of Rio de Janeiro. This ecosystem receives several inputs containing all sorts of pollutants, including heavy metals. The present work aimed to study the partitioning of heavy metals in the sediments of Rodrigo de Freitas and the influence of organic matter in this fractionation dynamic. The results of these analyses presented the contents of organic matter as an important metal-capturing agent. Fractionation of organic matter resulted in a predominance of humine. Heavy metal partitioning showed that the metals bound by the water-soluble phase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Rio de Janeiro; Rodrigo de Freitas lagoon; Heavy metals; Humic acids.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401289

Identification and analysis of vocal communication pathways in birds through inducible gene expression
Provedor de dados: 42
Autores: Mello,Claudio V.
The immediate-early gene zenk is an activity-dependent gene highly induced in auditory processing or vocal motor control brain areas when birds engage in hearing or producing song, respectively. Studies of the expression of zenk in songbirds and other avian groups will be reviewed here briefly, with a focus on how this analysis has generated new insights on the brain pathways and mechanisms involved in perceptual and motor aspects of vocal communication and vocal learning.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zenk; Songbird; Auditory; Learning; Birdsong.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200008

First record of the genus Choledocystus(Trematoda: Plagiorchiidae) for amphibians of the Chacoan region in Argentina
Provedor de dados: 42
Autores: HAMANN,MONIKA INES; LEÓN-RÈGAGNON,VIRGINIA; FERNÁNDEZ,MARÍA VIRGINIA; GONZÁLEZ,CYNTHYA ELIZABETH.
Abstract  This is the first record of the trematode Choledocystus incurvatum and Choledocystus elegans in Argentinean amphibians collected in two localities of the Chacoan region. The first trematode species was found infecting the small intestine of Pseudis paradoxa Linnaeus, captured near the city of Corrientes, Corrientes Province; the second species was found infecting the gall-bladder of Lepidobatrachus laevis Budgget, captured in Ingeniero Juárez, Formosa Province. Morphology of these species was studied in detail using light microscopy and scanning electron microscopy (SEM), and compared with previous studies of Brazilian and Venezuelan specimens. Morphological descriptions of these parasites are provided to supplement existing data. Choledocystus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trematoda; Choledocystus; Amphibians; Chacoan region; Argentina.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100723

Feeding habits of coypu (Myocastor coypus Molina 1978) in the wetlands of the Southern region of Brazil
Provedor de dados: 42
Autores: Colares,Ioni G.; Oliveira,Raquel N. V.; Liveira,Rafael M.; Colares,Elton P.
The aim of this study was to determine the diet of coypu (Myocastor coypus) in two areas (Santa Isabel do Sul wetlands - Area 1, and Santa Marta Farm - Area 2) in the Southern region of Brazil, using microhistological analyses of feces. Twenty-four plant species were identified from collected feces samples. Among the identified species, nine are common in the animals' diet in both areas; the presence of Oriza sativa was not detected in any of the samples. Among the identified species, 84% and 54% of the coypu's diet from Areas 1 and 2, respectively, are aquatic plants. Poaceae family was most common, being found in 82% of the samples from both areas. Paspalum disthichum (Area 1) and Panicum tricholaenoides (Area 2) were the most frequent species on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coypu; Diet; Food selection; Herbivore.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300015

Water temperature, body mass and fasting heat production of pacu (Piaractus mesopotamicus)
Provedor de dados: 42
Autores: AGUILAR,FREDY A.A.; CRUZ,THALINE M.P. DA; MOURÃO,GERSON B.; CYRINO,JOSÉ EURICO P.
ABSTRACT Knowledge on fasting heat production (HEf) of fish is key to develop bioenergetics models thus improving feeding management of farmed species. The core of knowledge on HEf of farmed, neotropical fish is scarce. This study assessed the effect of body mass and water temperature on standard metabolism and fasting heat production of pacu, Piaractus mesopotamicus, an omnivore, Neotropical fresh water characin important for farming and fisheries industries all through South American continent. An automated, intermittent flow respirometry system was used to measure standard metabolic rate (SMR) of pacu (17 - 1,050 g) at five water temperatures: 19, 23, 26, 29 and 33 °C. Mass specific SMR increased with increasing water temperature but decreased as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometric exponent; Bioenergetics models; Pacu; Respirometry; Standard metabolic rate.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301305

Seed size influence on germination responses to light and temperature of seven pioneer tree species from the Central Amazon
Provedor de dados: 42
Autores: Aud,Fabiana F.; Ferraz,Isolde D.K.
In Amazon secondary forests are dominated by pioneer species that typically produce large amounts of small and dormant seeds that are able to form a persistent soil seed bank. Seed dormancy in this group of species is overcome by environmental conditions found in open areas, such as high irradiation or alternating temperatures. Nevertheless, a variety of germination responses to environmental factors is known among pioneers; some of them may germinate in diffuse light or in darkness condition at constant temperature. Seed mass can be considered as one of the factors that promotes this variety. Regarding species with very small seeds, it seems that the trigger for germination is light and for larger seeds temperature alternation may be a more important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternating temperatures; Germinability; Mean germination time; Photoblastic germination; Secondary forests; Tropical trees.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300018

Towards an atomic level understanding of niobia based catalysts and catalysis by combining the science of catalysis with surface science
Provedor de dados: 42
Autores: Schmal,Martin; Freund,Hans-Joachim.
The science of catalysis and surface science have developed, independently, key information for understanding catalytic processes. One might argue: is there anything fundamental to be discovered through the interplay between catalysis and surface science? Real catalysts of monometallic and bimetallic Co/Nb2O5 and Pd-Co/Nb2O5 catalysts showed interesting selectivity results on the Fischer-Tropsch synthesis (Noronha et al. 1996, Rosenir et al. 1993). The presence of a noble metal increased the C+5 selectivity and decreased the methane formation depending of the reduction temperature. Model catalyst of Co-Pd supported on niobia and alumina were prepared and characterized at the atomic level, thus forming the basis for a comparison with "real" support...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalysis; Model catalysts; Cobalt; Palladium; Characterization; Niobia.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200016

Assigning dates and identifying areas affected by fires in Portugal based on MODIS data
Provedor de dados: 42
Autores: PANISSET,JESSICA; DACAMARA,CARLOS C.; LIBONATI,RENATA; PERES,LEONARDO F.; CALADO,TERESA J.; BARROS,ANA.
ABSTRACT An automated procedure is here presented that allows identifying and dating burned areas in Portugal using values of daily reflectance from near-infrared and middle-infrared bands, as obtained from the MODIS instrument. The algorithm detects persistent changes in monthly composites of the so-called (V,W) Burn-Sensitive Index and the day of maximum change in daily time series of W is in turn identified as the day of the burning event. The procedure is tested for 2005, the second worst fire season ever recorded in Portugal. Comparison between the obtained burned area map and the reference derived from Landsat imagery resulted in a Proportion Correct of 95.6%. Despite being applied only to the months of August and September, the algorithm is able to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burned area; MODIS; Portugal; Remote sensing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401487

Biflorin: an o-naphthoquinone of clinical significance
Provedor de dados: 42
Autores: WISINTAINER,GABRIELLE G.N.S.; SIMÕES,EVELYNE R.B.; LEMOS,TELMA L.G.; MOURA,SIDNEI; SOUZA,LUCIANA G.S.; FONSECA,ALUISIO M.; MORAES,MANOEL ODORICO; PESSOA,CLAUDIA; ROESCH-ELY,MARIANA; HENRIQUES,JOÃO A.P.
Biflorin is an o-naphthoquinone with proven cytotoxic effects on tumor cells showing antimicrobial, antitumor and antimutagenic activities. Biflorin is an isolated compound taken from the roots of the plantCapraria biflora L. (Schrophulariaceae), indigenous of the West Indies and South America, which is located in temperate or tropical areas. This compound has shown to be strongly active against grampositive and alcohol-acid-resistant bacteria. It has been efficient in inhibiting the proliferation tumor cell lines CEM, HL-60, B16, HCT-8 and MCF-7. Recently, SK-Br3 cell line was treated with biflorin showing important cytotoxic effects. In this article, information related to the first structural characterization studies are presented, as well as the latest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological activity; Biflorin; Capraria biflora; Natural products.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401907

Alzheimer´s Disease associated with Psychiatric Comorbidities
Provedor de dados: 42
Autores: Garcez,Michelle L.; Falchetti,Ana Carolina B.; Mina,Francielle; Budni,Josiane.
Alzheimer's disease (AD) is the most common cause of dementia and has become a severe public health issue. It is estimated that globally, 35.6% of people have some form of dementia. This number is expected to double by 2030, and possibly even triple by 2050. The disease is associated with deficits in cognition/memory and a reduced ability in coping with everyday life. Moreover, patients can experience behavioral alterations such as mood swings, depression and hallucinations. Therefore, it is common to find the presence of neuropsychiatric comorbidities such as depression, schizophrenia and bipolar disorder during the course or development of AD. These disorders can become severe enough to interfere with the patients daily functioning, and can worsen the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alzheimer's disease; Bipolar disorder; Depression; Schizophrenia.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301461

Compatibility of  Azospirillum brasilense and  Pseudomonas  fluorescens in growth promotion of groundnut ( Arachis  hypogea L.)
Provedor de dados: 42
Autores: PRASAD,ANDHARE A.; BABU,SUBRAMANIAN.
ABSTRACT We attempted to study the compatibility among plant beneficial bacteria in the culture level by growing them near in the nutrient agar plates. Among all the bacteria tested, Rhizobium was found to inhibit the growth of other bacteria. From the compatible group of PGPR, we have selected one biofertilizer (Azospirillum brasilense strain TNAU) and one biocontrol agent (Pseudomonas fluorescens strain PF1) for further studies in the pot culture. We have also developed a bioformulation which is talc powder based, for individual bacteria and mixed culture. This formulation was used as seed treatment, soil application, seedling root dip and foliar spray in groundnut crop in vitro germination conditions. A. brasilense was found to enhance the tap root...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azospirillum brasilense; Groundnut; PGPR; Pseudomonas fluorescens.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301027

Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
Provedor de dados: 42
Autores: Almeida,Renato P.; Santos,Maurício G. M.; Fragoso-Cesar,Antonio R.S.; Janikian,Liliane; Fambrini,Gelson L.
In Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards. We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquã Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaquã Basin was formed by at least two distinct extensional events,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Camaquã Basin; Earth Sciences; Neoproterozoic; Paleostress Analysis; Rift Basin; Southern Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200009

Pimarane Diterpenes and a Sesquiterpene from Salzmmania nitida
Provedor de dados: 42
Autores: Carvalho,Mário G. de; Alves,Josinete S.; da-Cunha,Emidio V. Leitão; Barbosa-Filho,José M.; Silva,Marcelo S. da.
Two new terpenoids, (+)-3-oxo-thermarol and 11-acetoxyeudesman-4alpha-methyl-5alpha-ol along with the (+)- thermarol were isolated from the aerial parts of Salzmmania nitida. The structures and unambiguous ¹H and 13C chemical shift assignments were established by spectroscopic means, including homo and heteronuclear techniques.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salzmmania nitida; Rubiaceae; Diterpenes; Eudesmane.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100003

Hawkmoth fauna (Sphingidae, Lepidoptera) in a semi-deciduous rainforest remnant: composition, temporal fluctuations, and new records for northeastern Brazil
Provedor de dados: 42
Autores: PRIMO,LUIS M.; DUARTE,JOSÉ A.; MACHADO,ISABEL C.
We carried out a qualitative and quantitative inventory of the hawkmoth fauna (Sphingidae) of an area of semi-deciduous seasonal rainforest in the state of Pernambuco (Tapacurá Ecological Station), northeastern Brazil. Hawkmoths were sampled monthly from October 2004 to February 2007 (27 months). We recorded 31 species from 16 genera, three tribes, and three families. Macroglossinae was the most abundant subfamily and represented ca. 71% of all species. Out of the 277 individuals collected, 88.4% were males. Five new records were made for northeastern Brazil: Enyo gorgon (Cramer, 1777), Perigonia stulta (Herrich-Schäffer, [1854]), Eupyrrhoglossum sagra (Poey, 1832), Nyceryx coffaeae (Walker, 1856) and Xylophanes chiron (Drury, 1773). Eight further species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry forest; Pernambuco Endemism Center; Phenology; Seasonality; Sphingidae abundance and richness; Sphingophily.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301177

Evaluation of Bcl-2, Bcl-x and Cleaved Caspase-3 in Malignant Peripheral Nerve Sheath Tumors and Neurofibromas
Provedor de dados: 42
Autores: CUNHA,KARIN S.; CARUSO,ANABELA C.; FARIA,PAULO A.; SILVA,LICíNIO E. DA; FONSECA,ELIENE C. DA; GELLER,MAURO; MOURA-NETO,RODRIGO S. DE; LOPES,VÂNIA S.
ABSTRACTAIMSTo study the expression of Bcl-2, Bcl-x, as well the presence of cleaved caspase-3 in neurofibromas and malignant peripheral nerve sheath tumors. The expression of Bcl-2 and Bcl-x and the presence of cleaved caspase 3 were compared to clinicopathological features of malignant peripheral nerve sheath tumors and their impact on survival rates were also investigated.MATERIALS AND METHODSThe evaluation of Bcl-2, Bcl-x and cleaved caspase-3 was performed by immunohistochemistry using tissue microarrays in 28 malignant peripheral nerve sheath tumors and 38 neurofibromas. Immunoquantification was performed by computerized digital image analysis.CONCLUSIONSApoptosis is altered in neurofibromas and mainly in malignant peripheral nerve sheath tumors....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apoptosis regulatory proteins; Malignant peripheral nervous sheath tumors; Neurofibroma; Neurofibromatosis 1.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401497

Riparian forest potential to retain sediment and bromophenol concentrations in fish
Provedor de dados: 42
Autores: Rech,Elibio; Galembeck,Fernando.
Tipo: Info:eu-repo/semantics/article
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200001

Biotransformation of sucrose into 5-hydroxy-2-hydroxymethyl-γ-pirone by Aspergillus flavus
Provedor de dados: 42
Autores: Ferreira,Nelson R.; Sarquis,Maria Inez M.; Alves,Cláudio N.; Santos,Alberdan S.
The sucrose hydrolysis and the preference of consumption of glucose instead of fructose were investigated for the production of 5-hydroxy-2-hydroxymethyl-γ-pyrone (HHMP) in the presence of Aspergillus flavus IOC 3974 cultivated in liquid Czapeck medium. Standardized 0.5g of pellets were transferred as inoculum into twelve conical flasks of 250 ml containing 100 ml of medium with different sucrose concentration, which was kept at 120 rpm and 28"C for 16 days without pH adjustment. Aliquots of 500μl of the broth culture were withdrawn at 24 h intervals and analyzed. The major yield of HHMP was 26g l-1 in 120g l-1 of sucrose. At these conditions, A. flavus produced an invertase capable of hydrolyzing 65% of total sucrose concentration in 24h, and an isomerase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus flavus; Biotransformation; Kojic acid; Secondary metabolite; Fructose-isomerase.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300004

An integrated IDTIMS, EVTIMS and SHRIMP zircon dating study
Provedor de dados: 42
Autores: SATO,KEI.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300047

Modeling radiative transfer in tropical rainforest canopies: sensitivity of simulated albedo to canopy architectural and optical parameters
Provedor de dados: 42
Autores: Yanagi,Sílvia N. M.; Costa,Marcos H.
This study evaluates the sensitivity of the surface albedo simulated by the Integrated Biosphere Simulator (IBIS) to a set of Amazonian tropical rainforest canopy architectural and optical parameters. The parameters tested in this study are the orientation and reflectance of the leaves of upper and lower canopies in the visible (VIS) and near-infrared (NIR) spectral bands. The results are evaluated against albedo measurements taken above the K34 site at the INPA (Instituto Nacional de Pesquisas da Amazônia) Cuieiras Biological Reserve. The sensitivity analysis indicates a strong response to the upper canopy leaves orientation (x up) and to the reflectivity in the near-infrared spectral band (rNIR,up), a smaller sensitivity to the reflectivity in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian Tropical Forest; Albedo; Radiative transfer; Modeling.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400010

Volcanism and stratigraphy of the Neoproterozoic Campo Alegre Basin, SC, Brazil
Provedor de dados: 42
Autores: CITRONI,SERGIO B.; BASEI,MIGUEL A. S.; SIGA JR.,OSWALDO; REIS NETO,JOSÉ M. DOS.
The depositional succession of the Campo Alegre Basin (Santa Catarina - southern Brazil) was investigated having the evolution of the volcanic activity as background. The different stratigraphic units are interpreted as belonging to different volcanic stages: Bateias Formation, conglomerates and sandstones, related with a pre-volcanic stage; Campo Alegre Group, at the main volcanic stage, with each different formation corresponding to different episodes of volcanism - Rio Negrinho Formation, corresponding to the basic volcanism, Avenca Grande Formation to ignimbritic event, Serra de São Miguel Formation to the acid volcanism and Fazenda Uirapuru Formation, related to an explosive event; Rio Turvo and Arroio Água Fria formations correspond respectively to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neoproterozoic Basin; Volcanism; Caldera deposits; Paleogeographic evolution.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400012

Penguins and their noisy world
Provedor de dados: 42
Autores: Aubin,Thierry.
Penguins identify their mate or chick by an acoustic signal, the display call. This identification is realized in a particularly constraining environment: the noisy world of a colony of thousands of birds. To fully understand how birds solve this problem of communication, we have done observations, acoustic analysis, propagation and playback experiments with 6 species of penguins studied in the field. According to our results, it appears that penguins use a particularly efficient ''anti-confusion'' and ''anti-noise'' coding system, allowing a quick identification and localization of individuals on the move in a noisy crowd.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Communication in noise; Sound localization; Vocal recognition; Penguins.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200015

Morphology of the megaspore Lagenoisporites magnus (Chi and Hills 1976) Candilier et al. (1982), from the Carboniferous (lower Mississippian: mid-upper Tournaisian) of Bolivia
Provedor de dados: 42
Autores: QUETGLAS,MARCELA; MACLUF,CECILIA; PASQUO,MERCEDES DI.
Abstract: The morphology and structure of megaspores assigned to Lagenoisporites magnus from the Toregua Formation, Retama Group, mid-upper Tournaisian of Bolivia were studied. The analysis was performed with light, fluorescence and scanning electron microscopy. Megaspores were laterally compressed and presented a spherical body with a proximal gula, of the hologula type. Gula had verrucae ornamentation and the spore body presented complex processes consisting of a bulbous base and an internally partitioned projection with sharp apex. In addition to this main ornamentation, perforations were present throughout the spore surface. Megaspores showed well marked curvaturae perfectae due to the abrupt transition existing between the gula ornamentation and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bolivia; Carboniferous; Lycopsids; Megaspores; Tournaisian.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400515

Mechanisms of Endothelial Protection by Natural Bioactive Compounds from Fruit and Vegetables
Provedor de dados: 42
Autores: MONSALVE,BERNARDITA; CONCHA-MEYER,ANIBAL; PALOMO,IVÁN; FUENTES,EDUARDO.
ABSTRACT The endothelium is fundamental for the regulation of vascular tone and structure. Under disease conditions, including the presence of cardiovascular disease risk factors, the endothelium loses its protective role and becomes a proatherosclerotic structure. In this article we searched for strategies from PUBMED and Science Direct databases using the following key words: endothelium, natural bioactive compounds, polyphenols and cardiovascular diseases. The search was restricted to english language papers. Studies have identified the contribution of diet to the risk of developing cardiovascular diseases. In this context, high intakes of fruit and vegetables are associated with the decrease of cardiovascular diseases. Thus the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endothelium; Natural bioactive compounds; Polyphenols; Cardiovascular diseases.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200615

Petrology of Gameleira potassic lamprophyres, São Francisco Craton
Provedor de dados: 42
Autores: Plá Cid,Jorge; Campos,Cristiani S.; Nardi,Lauro V.S.; Florisbal,Luana.
Gameleira lamprophyres are dykes and mafic microgranular enclaves associated with the shoshonitic Gameleira monzonite. This association belongs to the Paleoproterozoic alkaline magmatism from Serrinha nucleus, northeast Brazil. The liquidus paragenesis is diopside, pargasite, apatite and mica. Reverse zoning was identified in the groundmass alkali feldspar and was related to the undercooling of lamprophyric magma during the emplacement, with high growth rate of pargasite/edenite inducing disequilibrium between feldspars and liquid. Chemical data indicate that the lamprophyres are basic rocks (SiO2 &lt; 48 wt%), with alkaline character (Na2O + K2O &amp;gt; 3 wt%) and potassic signature (K2O/Na2O ≈ 2). High contents of MgO and Cr are consistent with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potassic lamprophyres; Gameleira lamprophyres; São Francisco Craton; Mantle metasomatism; Petrology; Mineralogy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200010

Differential Effect of Solution Conditions on the Conformation of the Actinoporins Sticholysin II and Equinatoxin II
Provedor de dados: 42
Autores: FAUTH,EDSON V.F.; CILLI,EDUARDO M.; LIGABUE-BRAUN,RODRIGO; VERLI,HUGO.
Actinoporins are a family of pore-forming proteins with hemolytic activity. The structural basis for such activity appears to depend on their correct folding. Such folding encompasses a phosphocholine binding site, a tryptophan-rich region and the activity-related N-terminus segment. Additionally, different solution conditions are known to be able to influence the pore formation by actinoporins, as for Sticholysin II (StnII) and Equinatoxin II (EqtxII). In this context, the current work intends to characterize the influence of distinct solution conditions in the conformational behavior of these proteins through molecular dynamics (MD) simulations. The obtained data offer structural insights into actinoporins dynamics in solution, characterizing its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinoporins; GROMACS; Molecular dynamics; Pore-forming proteins.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401949

Occurrences of evaporites in the Irati subgroup (Late Permian, Paraná Basin)
Provedor de dados: 42
Autores: Hachiro,Jorge.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400017

Characterisation of solvent extractable organic constituents in atmospheric particulate matter: an overview
Provedor de dados: 42
Autores: Alves,Célia A.
In spite of accounting for 10-70% of the atmospheric aerosol mass, particulate-phase organic compounds are not well characterised, and many aspects of aerosol formation and evolution are still unknown. The growing awareness of the impact of particulate aerosols on climate, and the incompletely recognised but serious effects of anthropogenic constituents on air quality and human health, have conducted to several scientific studies. These investigations have provided information about the behaviour of atmospheric particulate matter and the description of the character of its carbonaceous content. The compilation of such results is important as they append to the emergent global-wide dataset of the organic composition of atmospheric aerosols. The contribution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atmospheric aerosol; Gas chromatography-masss pectrometry; Organic compounds; Source apportionment; Tracers.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100003

Splendid oddness: revisiting the curious trophic relationships of South American Pleistocene mammals and their abundance
Provedor de dados: 42
Autores: FARIÑA,RICHARD A.; CZERWONOGORA,ADA; GIACOMO,MARIANA DI.
The South American Pleistocene mammal fauna includes great-sized animals that have intrigued scientists for over two centuries. Here we intend to update the knowledge on its palaeoecology and provide new evidence regarding two approaches: energetics and population density and relative abundance of fossils per taxa. To determine whether an imbalance exists, population density models were applied to several South American fossil faunas and the results compared to those that best describe the palaeoecology of African faunas. The results on the abundance study for Uruguay and the province of Buenos Aires during the Lujanian stage/age reveal that bulk-feeding ground sloths (Lestodon and Glossotherium) were more represented in the first territory, while the more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Megafauna; Palaeoecology; Population density; Secondary productivity; Quaternary.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100311

Dispersion and aggregation patterns of tree species in Araucaria Forest, Southern Brazil
Provedor de dados: 42
Autores: MAÇANEIRO,JOÃO PAULO DE; GASPER,ANDRÉ LUÍS DE; GALVÃO,FRANKLIN; SCHORN,LAURI A.
Abstract Studies about dispersal syndromes and spatial distribution can provide information about species ecology. However, few studies analyze these ecological patterns in different vegetation layers. In this work, we verified the relationship between the dispersion syndromes and the spatial distribution in different layers in Araucaria Forest. We sampled 180 plots with size and inclusion criteria that changed according to the vegetative layer. We sampled 15,545 individuals in 103 tree species. We found significant differences between the number of species in the dispersion syndromes (χ2 = 11.52; P ≤ 0.05) and spatial distribution patterns (χ2 = 10.94; P ≤ 0.05), being zoochoric and tends to clustering the most predominant. We also found a significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria forest; Seed dispersal; Spatial distribution; Layers analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502397

6-Bromoindirubin-3’-oxime promotes osteogenic differentiation of canine BMSCs through inhibition of GSK3β activity and activation of the Wnt/β-catenin signaling pathway
Provedor de dados: 42
Autores: ZHAO,XIAO-E; YANG,ZHENSHAN; GAO,ZHEN; GE,JUNBANG; WEI,QIANG; MA,BAOHUA.
﻿﻿This﻿﻿ study aimed to investigate how 6-bromoindirubin-3’-oxime (BIO) increases the osteogenic differentiation of canine bone mesenchymal stem cells (BMSCs) and the role of the Wnt/β-catenin signaling pathway in this process. We mimicked the effect of Wnt by adding BIO to the culture medium of BMSCs and examined whether canonical Wnt signaling positively affects the differentiation of these cells into osteoblasts. Canine BMSCs were cultured with 0.5 and 1.0 μM BIO under osteogenic conditions and then differentiation markers were investigated. It was found that BIO significantly increased the activity of alkaline phosphatase (ALP), the number of ALP-positive cells, the mineralization level and calcium deposits. Moreover, cells cultured with 0.5 and 1.0 μM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone mesenchymal stem cells; Bromoindirubin oxime; Osteogenetic differentiation; Canine.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100610

Steady electrodiffusion in hydrogel-colloid composites: macroscale properties from microscale electrokinetics
Provedor de dados: 42
Autores: Hill,Reghan J.
A rigorous microscale electrokinetic model for hydrogel-colloid composites is adopted to compute macroscale profiles of electrolyte concentration, electrostatic potential, and hydrostatic pressure across membranes that separate electrolytes with different concentrations. The membranes are uncharged polymeric hydrogels in which charged spherical colloidal particles are immobilized and randomly dispersed with a low solid volume fraction. Bulk membrane characteristics and performance are calculated from a continuum microscale electrokinetic model (Hill 2006b, c). The computations undertaken in this paper quantify the streaming and membrane potentials. For the membrane potential, increasing the volume fraction of negatively charged inclusions decreases the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrodiffusion; Electrokinetic phenomena; Hydrogel-colloid composites; Membrane potential; Microhydrodynamics; Soft composite materials; Streaming potential.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100007

The Exponentiated Power Generalized Weibull: Properties and Applications
Provedor de dados: 42
Autores: PEÑA-RAMÍREZ,FERNANDO A.; GUERRA,RENATA R.; CORDEIRO,GAUSS M.; MARINHO,PEDRO R.D.
Abstract We propose a new lifetime model called the exponentiated power generalized Weibull (EPGW) distribution, which is obtained from the exponentiated family applied to the power generalized Weibull (PGW) distribution. It can also be derived from a power transform on an exponentiated Nadarajah-Haghighi random variable. Since several structural properties of the PGW distribution have not been studied, they can be obtained from those of the EPGW distribution. The model is very flexible for modeling all common types of hazard rate functions. It is a very competitive model to the well-known Weibull, exponentiated exponential and exponentiated Weibull distributions, among others. We also give a physical motivation for the new distribution if the power...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exponential distribution; Lifetime data; Nadarajah-Haghighi distribution; Power generalized Weibull distribution; Survival function.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602553

Caring about medullary anesthesia in Saimiri sciureus: the conus medullaris topography
Provedor de dados: 42
Autores: Lima,Ana R.; Fioretto,emerson T.; Fontes,Rodrigo F.; Imbeloni,Aline A.; Muniz,José A. P. C.; Branco,Érrika.
Saimiri sciureus is a New World non-human primate (NHP) that inhabits Brazilian rain forests. Surgical interventions in wild NHPs can be considered common both for experimental studies procedures and corrective procedures for endangered species. Among various anesthetic procedures, the epidural anesthesia or blockades, depending on the surgical procedure, might be considered elective for wild monkeys, mostly based on its safeness, efficiency and non-time consuming characteristics. However its safeness would be limiting because of the spinal cord arrangement. Notwithstanding the available former studies on New World NHP anatomy, the description of the medullar cone of Saimiri sciureus is still scarce. Therefore, we believe that the better understanding the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Conus medullaris; Epidural anaesthesia; Saimiri sciureus.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400020

X-ray diffractometry applied to the comparative study of processes of formation of automotive batteries
Provedor de dados: 42
Autores: BORGES,LUCILA E. P.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300042

Erratum to "Bernstein-type theorems in hypersurfaces with constant mean curvature" [An Acad Bras Cienc 72(2000): 301-310]
Provedor de dados: 42
Autores: CARMO,MANFREDO P. DO; ZHOU,DETANG.
An erratum to Lemma 2.1 in Do Carmo and Zhou (2000) is presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riemannian manifold; Eigenvalue; Hypersurface; Mean curvature.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300004

Tidal and sub-tidal sea level variability at the northern shelf of the Brazilian Northeast Region
Provedor de dados: 42
Autores: FROTA,FELIPE F.; TRUCCOLO,ELIANE C.; SCHETTINI,CARLOS A.F.
ABSTRACT A characterization of the sea level variability at tidal and sub-tidal frequencies at the northern shore of the Brazilian Northeast shelf for the period 2009-2011 is presented. The sea level data used was obtained from the Permanent Geodetic Tide Network from the Brazilian Institute of Geography and Statistics for the Fortaleza gauge station. Local wind data was also used to assess its effects on the low-frequency sea level variability. The variability of the sea level was investigated by classical harmonic analysis and by morphology assessment over the tidal signal. The low frequencies were obtained by low-pass filtering. The tidal range oscillated with the highest value of 3.3 m during the equinox and the lowest value of 0.7 m during the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sea level variability; Harmonic constituents; Tidal height; Fortaleza; Ceará.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401371

Intra-uterine experimental infection by Ureaplasma diversum induces TNF-α mediated womb inflammation in mice
Provedor de dados: 42
Autores: Silva,Jamile R.; Ferreira,Lício F.A.A.; Oliveira,Percíllia V.S.; Nunes,Ivanéia V.; Pereira,Ítalo S.; Timenetsky,Jorge; Marques,Lucas M.; Figueiredo,Tiana B.; Silva,Robson A.A.
Ureaplasma diversum is an opportunistic pathogen associated with uterine inflammation, impaired embryo implantation, infertility, abortions, premature birth of calves and neonatal pneumonia in cattle. It has been suggested that the intra-uterine infection by Ureaplasma diversum can cause vascular changes that hinder the success of pregnancy. Thus, the aim of this study was to evaluate the changes of intrauterine site of A/J mice in estrus or proestrus phase inoculated with Ureaplasma diversum. The infection was monitored at 24, 48 and 72 hours by the PCR methodology to detect the Ureaplasma in the inoculation site and the profile of circulating blood cells. Morphological changes, intensity of inflammation and the production of cytokines were compared. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycoplasma; Uterus; Ureaplasma; Mice.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200643

Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Karniol,Tiago R.; Machado,Rômulo; Dehler,Nolan M.
Structural analysis carried out on a segment of the Neoproterozoic Ribeira Belt, southeastern Brazil, show that it represents part of the transpressive dextral orogen related to the Central Mantiqueira Province. NNE-trending and steeply dipping regional mylonitic belts form anastomosed geometry, and describe a map-scale, S-C-like structure that is characterized by their deflection towards NE near the Além Paraíba Lineament. Lithological and structural control related to deformation partition were responsible for the formation of felsic mylonitic granulites with S-type granites lenses developed in ductile shear zones, alternated with less deformed intermediate to basic granulites associated with charnockites. The dextral shear sense indicators are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ribeira Belt; Kinematics; Transpression; Syncontractional extension.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016

Application of modified simplex on the development of a preconcentration system for cadmium determination in sediments, food and cigarettes
Provedor de dados: 42
Autores: SANTOS,QUEILA O.; MORENO,ISLANIA; SANTOS,LEANDRO DOS; SANTOS,ALDENOR G.; SOUZA,VALDINEI S.; BEZERRA,MARCOS A.
A modified simplex algorithm was used to optimize a system of preconcentration for cadmium determination in samples of sediments, cigarettes and food using flame atomic absorption spectrometry. The preconcentration system is based on the sorption of cadmium in a minicolumn packed with Amberlite XAD-2 resin functionalized with 3,4-dihydroxybenzoic acid (DHB). The optimized variables were pH and sampling flow rate and the optimum conditions found for these variables were, respectively 8.7 and 8.8 mL min-1. The developed system showed a preconcentration factor of 15.3, detection limit of 0.49 µg L-1, quantification limit of 1.65 µg L-1 and precision expressed as relative standard deviation (% RSD, n=10) of 5.9. The accuracy of the method was checked by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Simplex optimization; Preconcentration; Cadmium; Sediments; Cigarettes; Food.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300791

Brazilian legislation on genetic heritage harms Biodiversity Convention goals and threatens basic biology research and education
Provedor de dados: 42
Autores: ALVES,RUY JOSÉ V.; WEKSLER,MARCELO; OLIVEIRA,JOÃO A.; BUCKUP,PAULO A.; POMBAL JR.,JOSÉ P.; SANTANA,HÉLCIO R.G.; PERACCHI,ADRIANO LÚCIO; KELLNER,ALEXANDER W.A.; ALEIXO,ALEXANDRE; LANGGUTH,ALFREDO; ALMEIDA,ALZIRA MARIA P. DE; ALBERNAZ,ANA LUISA; RIBAS,CAMILA C.; ZILBERBERG,CARLA; GRELLE,CARLOS EDUARDO V.; ROCHA,CARLOS F.D.; LAMAS,CARLOS JOSÉ E.; HADDAD,CÉLIO F.B.; BONVICINO,CIBELE R.; PRADO,CYNTHIA P.A.; LIMA,DANIELA O. DE; ROSSA-FERES,DENISE C.; SANTOS,FABRÍCIO R. DOS; SALIMENA,FÁTIMA REGINA G.; PERINI,FERNANDO A.; BOCKMANN,FLÁVIO A.; FRANCO,FRANCISCO LUÍS; GIUDICE,GISELE M.L. DEL; COLLI,GUARINO R.; VIEIRA,IMA CÉLIA G.; MARINHO-FILHO,JADER; WERNECK,JANE M.C.F.; SANTOS,JORGE A.D. DOS; NASCIMENTO,JORGE LUIZ DO; NESSIMIAN,JORGE LUIZ; CORDEIRO,JOSÉ LUIS P.; CLARO,KLEBER DEL; SALLES,LEANDRO O.; CASATTI,LILIAN; PY-DANIEL,LUCIA HELENA R.; SILVEIRA,LUÍS FÁBIO; TOLEDO,LUÍS FELIPE; OLIVEIRA,LUIZ F. DE; MALABARBA,LUIZ ROBERTO; SILVA,MARCELO D. DA; COURI,MÁRCIA S.; MARTINS,MÁRCIO; TAVARES,MARCOS D.S.; SOBRAL,MARCOS EDUARDO G.; VIEIRA,MARCUS VINÍCIUS; OLIVEIRA,MARIA DE LOURDES A.; PINNA,MÁRIO DE; HOPKINS,MICHAEL J.G.; SOLÉ,MIRCO; MENEZES,NAÉRCIO A.; PASSOS,PAULO; D’ANDREA,PAULO SERGIO; PINTO,PEDRO C.E.A.; VIANA,PEDRO L.; TOLEDO,PETER M.; REIS,ROBERTO E.; VILELA,ROBERTO; BASTOS,ROGÉRIO P.; COLLEVATTI,ROSANE G.; CERQUEIRA,RUI; CASTROVIEJO-FISHER,SANTIAGO; CARAMASCHI,ULISSES.
Tipo: Info:eu-repo/semantics/other
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401279

Vocal mechanisms in birds and bats: a comparative view
Provedor de dados: 42
Autores: Suthers,Roderick A.
Vocal signals play a very important role in the life of both birds and echolocating bats, but these two unrelated groups of flying vertebrates have very different vocal systems. They nevertheless must solve many of the same problems in producing sound. This brief review examines avian and microchiropteran motor mechanisms for: 1) coordinating the timing of phonation with the vocal motor pattern that controls its acoustic properties, and 2) achieving respiratory strategies that provide adequate ventilation for pulmonary gas exchange, while also facilitating longer duration songs or trains of sonar pulses.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birdsong; Echolocation; Minibreaths; Respiration; Vocalization.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200009

Publish and perish in the hands of predatory journals
Provedor de dados: 42
Autores: CORDEIRO,YRAIMA; LIMA,LUIS MAURÍCIO T.R.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300787

Surfaces of Constant Mean Curvature in Euclidean 3-space Orthogonal to a Plane along its Boundary
Provedor de dados: 42
Autores: HINOJOSA,PEDRO A.
We consider compact surfaces with constant nonzero mean curvature whose boundary is a convex planar Jordan curve. We prove that if such a surface is orthogonal to the plane of the boundary, then it is a hemisphere.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surfaces with boundary; Constant mean curvature; Elliptic partial differential equation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100004

Germination responses of the invasive Calotropis procera (Ait.) R. Br. (Apocynaceae): comparisons with seeds from two ecosystems in northeastern Brazil
Provedor de dados: 42
Autores: LEAL,LAURA C.; MEIADO,MARCOS V.; LOPES,ARIADNA V.; LEAL,INARA R.
Life history traits are considered key indicators of plant invasibility. Among them, the germination behavior of seeds is of major relevance because it is influenced by environmental factors of invaded ecosystem. Here, we investigated how seed traits and seed tolerance to environmental factors on seed germination of Calotropis procera vary depending on the invaded ecosystems in northeastern Brazil. We have tested seeds from two vegetation types – Caatinga and Restinga – to different levels of light intensity, salinity, and water stress. Previous to those experiments, seed-set and morphometric analysis were carried out for both studied populations. We have observed a higher seed-set in Caatinga. Seeds produced in this ecosystem had lower seed moisture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological invasions; Caatinga; Environmental factors; Restinga; Seed germination; Seed-set.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301025

Does mechanical damage on soybean induces the production of flavonoids?
Provedor de dados: 42
Autores: SILVA,PAULO LUIZ DA; CORDEIRO,GLÁUCIA; SILVA,CAROLINA R. DA; BARROS,RAFAEL A.; SILVA,CAMILA R. DA; ZANUNCIO,JOSÉ C.; CAMPOS,WELLINGTON G.; OLIVEIRA,MARIA G.A.
Abstract The response of plants to grazing includes the production of chemical defense compounds such as proteases inhibitors and secondary metabolites as flavonoids, which makes them less palatable to feeding and negatively affecting the physiology of insects. The aim of this study was to evaluate the phytochemical response of soybean cultivars (Glycine max (L.) Merrill) resistant (IAC-17, IAC-24) and susceptible (IAC-P1) to insects after mechanical damage. These cultivars were mechanically injured, and after 24 hours samples of these plants were analyzed by HPLC to identify and quantify flavonoids. The flavonoids daidzein, quercetin, and rutin were quantified, with the highest concentration of daidzin in soybean cultivars after mechanical damage. Rutin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Flavonoid; Herbivory; Mechanical damage; Secondary metabolite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703415

Diosmin induces caspase-dependent apoptosis in human glioblastoma cells
Provedor de dados: 42
Autores: SOARES,JULIANA M.; FARIA,BRUNA M. DE; ASCARI,LUCAS M.; ALVES-LEON,SONIZA V.; SOUZA,JORGE M. DE; SOARES,ANTONIO G.; CORDEIRO,YRAIMA; ROMÃO,LUCIANA F.
Abstract: Diosmin is a flavone glycoside clinically used as the main component of Daflon for the treatment of venous diseases. Several studies demonstrated that this natural compound can induce apoptosis in different tumors. However, isolated diosmin has not been studied regarding its effects on glioblastoma so far. Since glioblastoma is a highly lethal and fast-growing brain tumor, new therapeutic strategies are urgently needed. Herein, we evaluated the role of this flavonoid against glioblastoma cells using in vitro assays. Diosmin significantly reduced the viability of GBM95, GBM02, and U87MG glioblastoma cells, but not of healthy human astrocytes, as verified by MTT assay. Vimentin immunostaining showed that diosmin induced morphological changes in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apoptosis; Diosmin; Flavonoid; Glioblastoma.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700701

Histological Changes in Category 2 Animal Byproducts under the Influence of a Ferment Preparation
Provedor de dados: 42
Autores: LUKIN,ALEKSANDR; NAUMOVA,NATALIA; BITIUTSKIKH,KSENIA.
Abstract  The paper deals with the possibility of processing category 2 animal byproducts with a ferment preparation. We chose collagen-rich cattle lips and ears as the category 2 byproducts for our study. The selected samples were processed in the following sequence: fixation, rinsing with running water, densifying the samples, slicing into sections, dying sections, and enclosing the sections under cover glass. The pathohistomorphologic changes found in the control samples significantly differ both before the processing and after the use of the ferment preparation Protepsin, which caused destructive metabolic and hydrolytic processes in the dense connective tissue of the ear and lip framework and led to softening of the muscle parenchyma of the organs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lips; Ears; Pathohistomorphologic changes; Protepsin; Animal byproducts; Ferment.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100715

On the occurrence of an avian vertebra in Cretaceous strata of Morocco, Africa
Provedor de dados: 42
Autores: RIFF,DOUGLAS; KELLNER,ALEXANDER W.A.; MADER,BRYN; RUSSEL,DALE.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200023

N deposition affects allelopathic potential of Amaranthus retroflexus with different distribution regions
Provedor de dados: 42
Autores: WANG,CONGYAN; LIU,JUN; ZHOU,JIAWEI.
ABSTRACT This study aims to determine the allelopathic potential of Amaranthus retroflexus (Ar) with different climatic zones on seed germination and growth of A. tricolor (At) treated with a gradient N addition. Ar leaf extracts only displayed significantly allelopathic potential on the underground growth of Ar but not the aboveground growth of At. The allelopathic potential of Ar leaf extracts on root length of At were enhanced under N addition and there may be a N-concentration-dependent relationship. The effects of the extracts of Ar leaves that collected from Zhenjiang on seed germination and growth of At may be higher than that collected from Jinan especially on root length of At under medium N addition. This reason may be the contained higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathic potential; Invasive plant; N deposition; Seed germination; Amaranthus retroflexus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300919

Characterization of the occupied shells by the hermit crab Clibanarius vittatus (Decapoda, Diogenidae) at Baixio Mirim tideflat, Guaratuba Bay, southern Brazil
Provedor de dados: 42
Autores: Sampaio,Sara R.; Masunari,Setuko.
A characterization of the occupied shells by the hermit crab Clibanarius vittatus was carried out. Hermit crabs were collected in the intertidal zone, during the low spring tide monthly from April 2005 to March 2006. They were sexed and their cephalothoracic shield length (CL) was measured. Shells were identified, dried, weighed and the aperture length (AL) and width (AW) were measured. 1187 crabs were collected (949 males, 216 females and 22 intersexes), which occupied 12 species of gastropod shells. Stramonita haemastoma, Olivancillaria urceus and Dorsanum moniliferum made up 96.55% of the total shell species. Male hermit crabs attained significantly larger sizes than females; therefore, males occupied a wider spectrum of shells in size and weight. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guaratuba Bay; Shell availability; Shell occupation; Shell size and shape.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400005

Immunophenotyping lymphocyte and acute phase proteins in canine X-linked muscular dystrophy
Provedor de dados: 42
Autores: ABREU,DILAYLA K. DE; MONTEIRO,JANAINA M.; SOUZA,CAROLINA C.; KARAM,RAFAEL G.; FERNANDES,RENATA A.; LESSA,THAIS B.; FAGLIARI,JOSÉ J.; MIGLINO,MARIA ANGELICA; AMBROSIO,CARLOS EDUARDO.
Abstract Duchenne Muscular Dystrophy (DMD) is the most common X-linked muscular disease affecting humans. The Golden Retriever Muscular Dystrophy model (GRMD) is considerthe most suitable for several studies. This assay aims to quantify lymphocyte subpopulations CD4, CD5, and CD8, and standardize, the serum electrophoretic profile, to understand their contribution to the pathologic process in normal Golden Retriever dogs (GR group) and dystrophic´s (GRMD group), through the umbilical cord blood, in dogs aged from 2 to 3 months (GR II and GRMD II), and in dogs over 1 year of age (GR III and GRMD III). No significant differences were observed between the CD8+ lymphocyte subpopulations of the groups studied. The CD4+ and CD5+ lymphocyte subpopulations were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute phase protein; Dystrophic model; Immune behavior; Inflammatory response; Muscular dystrophy; Serum protein.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602977

Watery and dark axons in Wallerian degeneration of the opossum's optic nerve: different patterns of cytoskeletal breakdown?
Provedor de dados: 42
Autores: NARCISO,MARCELO S.; HOKOÇ,JAN NORA; MARTINEZ,ANA M. B.
In this paper we report a qualitative morphological analysis of Wallerian degeneration in a marsupial. Right optic nerves of opossums Didelphis marsupialis were crushed with a fine forceps and after 24, 48, 72, 96 and 168 hours the animals were anaesthetized and perfused with fixative. The optic nerves were immersed in fixative and processed for routine transmission electron microscopy. Among the early alterations typical of axonal degeneration, we observed nerve fibers with focal degeneration of the axoplasmic cytoskeleton, watery degeneration and dark degeneration, the latter being prevalent at 168 hours after crush. Our results point to a gradual disintegration of the axoplasmic cytoskeleton, opposed to the previous view of an "all-or-nothing'' process...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Nerve fiber; Crush lesion; Watery degeneration; Dark degeneration; Marsupial.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200008

Surface modification of a granite building stone in central Rio de Janeiro
Provedor de dados: 42
Autores: Baptista-Neto,José A.; Smith,Bernard J.; McAllister,John J.; Silva,Maria Augusta M.; Castanheira,Fabio S.
In order to evaluate environmental controls on the soiling formation and decay of building stones a set of mapping and physical and chemical analyses were carried out on granite from a historical church in the polluted centre of Rio de Janeiro. These techniques highlight the increasing of threatening damage on generally perceived as a durable building material, caused by granular disaggregation and contour scaling in areas close to ground level. Mapping also indicated the formation of black crusts over entire building façades, concentrated on areas sheltered from rain-wash. Analyses demonstrated the influence of marine aerosols, rock and mortar composition and mostly of the atmospheric pollutants on the decay and soiling of the granite. Much of the decay...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weathering; Granite; Air pollution; Marine aerosols; Gypsum crusts.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200011

Molecular characterization of Moenkhausia (Pisces: Characiformes) populations with different lateral line developmental levels
Provedor de dados: 42
Autores: MOTA,THAÍS F.M.; FABRIN,THOMAZ M.C.; DEPRÁ,GABRIEL C.; GASQUES,LUCIANO S.; OLIVEIRA,ALESSANDRA V. DE; PAVANELLI,CARLA S.; PRIOLI,SÔNIA M.A.P.; PRIOLI,ALBERTO J.
ABSTRACT The genera Hemigrammus and Moenkhausia have been traditionally diagnosed mainly by the former having lateral line completely pored whereas the latter having a lateral line with a few pored scales. Those features have been used to diagnose species of both genera in the upper Paraná River floodplain. Specimens with the diagnostic features of Moenkhausia bonita, collected in the upper Paraná River floodplain, exhibited different developmental levels of the lateral line, making it difficult to distinguish them from specimens of Hemigrammus sp. We analyzed the gene encoding cytochrome C oxidase I (COI) and intron 1 of the nuclear gene S7 to investigate the genetic similarities between the called Hemigrammus marginatus and M. bonita and to confirm their...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytochrome C oxidase; Delimitation of species; DNA barcode; Hemigrammus; Intron 1 of the nuclear gene S7; Paraná River.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602815

History on the biological nitrogen fixation research in graminaceous plants: special emphasis on the Brazilian experience
Provedor de dados: 42
Autores: Baldani,José I.; Baldani,Vera L.D.
This review covers the history on Biological Nitrogen Fixation (BNF) in Graminaceous plants grown in Brazil, and describes research progress made over the last 40 years, most of whichwas coordinated by Johanna Döbereiner. One notable accomplishment during this period was the discovery of several nitrogen-fixing bacteria such as the rhizospheric (Beijerinckia fluminensis and Azotobacter paspali), associative (Azospirillum lipoferum, A. brasilense, A. amazonense) and the endophytic (Herbaspirillum seropedicae, H. rubrisubalbicans, Gluconacetobacter diazotrophicus, Burkholderia brasilensis and B. tropica). The role of these diazotrophs in association with grasses, mainly with cereal plants, has been studied and a lot of progress has been achieved in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial endophytes; Diazotrophs; Semi-solid N-free medium; Inoculation; Cereals; Grass plants.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300014

Thyroid gland development in Rachycentron canadum during early life stages
Provedor de dados: 42
Autores: OTERO,ADRIANA P.S.; RODRIGUES,RICARDO V.; SAMPAIO,LUÍS A.; ROMANO,LUIS A.; TESSER,MARCELO B.
The aim of this study was to describe the ontogeny of thyroid follicles in cobia Rachycentron canadum. Larvae were sampled daily (n=15 - 20) from hatching until 15 dah (days after hatching). Following, larvae were sampled every two days by 28 dah; a new sample was taken at 53 dah. The samples were dehydrated, embedded in Paraplast, and sections of 3 µm were dewaxed, rehydrated and stained with HE and PAS. A single follicle was already present 1 dah and three follicles were found 8 dah. The number of follicles increased up to 19 on 53 dah. The diameter of follicles and follicular cell height were lower 1 dah (6.83 ± 1.00 and 4.6 ± 0.01 µm), but increased from 8 dah (24.03 ± 0.46 µm e 6.43 ± 0.46 µm). From 8 dah, the presence of reabsorption vesicles was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloid; Follicles; Larvae; Metamorphosis; Thyroid tissue.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301507

Effects of environmental conditions associated to the cardinal orientation on the reproductive phenology of the cerrado savanna tree Xylopia aromatica (Annonaceae)
Provedor de dados: 42
Autores: Camargo,Maria Gabriela G.; Souza,Regina M.; Reys,Paula; Morellato,Leonor P.C.
The Brazilian cerrado has undergone an intense process of fragmentation, which leads to an increase in the number of remnants exposed to edge effects and associated changes on environmental conditions that may affect the phenology of plants. This study aimed to verify whether the reproductive phenology of Xylopia aromatica (Lam.) Mart. (Annonaceae) differs under different light conditions in a cerrado sensu stricto (a woody savanna) of southeastern Brazil. We compared the reproductive phenology of X. aromatica trees distributed on east and south cardinal faces of the cerrado during monthly observations, from January 2005 to December 2008. The east face had a higher light incidence, higher temperatures and canopy openness in relation to south face. X....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado savanna; Edge effect; Fragmentation; Reproductive phenology; Synchrony.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300019

Long-term activation of adenosine receptors regulates the survival and blocks glutamate-mediated neurotoxicity in cultures of retinal neurons
Provedor de dados: 42
Autores: PAES-DE-CARVALHO,ROBERTO; FERREIRA,JAINNE MARTINS.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300019

Rhodnius prolixus Malpighian tubules and control of diuresis by neurohormones
Provedor de dados: 42
Autores: Martini,Sabrina V.; Nascimento,Suzete B.; Morales,Marcelo M.
Rhodnius prolixus Malpighian tubules (MTs) are a good model for fluid and ion secretion studies in view of the dramatic postprandial diuresis, which follows its massive blood meals. Ingestion of a blood meal equals to 10-12 times their initial body mass, leads to rapid activation of high output by excretory system, which eliminates 40-50% of the fluid mass. Secretion of ions and water is stimulated 1000-fold by serotonin and diuretic hormone. These hormones cooperate synergistically to activate adenylate cyclase activity from MTs cells, which increase the level of intracellular cAMP. The anti-diuretic hormones have also an important role in the fluid maintenance of Rhodnius prolixus. Several hours after insect feeding occurs a reduction in urine flow, that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighian tubules; Rhodnius prolixus; Hormones; Fluid secretion.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100011

A weighted negative binomial Lindley distribution with applications to dispersed data
Provedor de dados: 42
Autores: BAKOUCH,HASSAN S.
Abstract A new discrete distribution is introduced. The distribution involves the negative binomial and size biased negative binomial distributions as sub-models among others and it is a weighted version of the two parameter discrete Lindley distribution. The distribution has various interesting properties, such as bathtub shape hazard function along with increasing/decreasing hazard rate, positive skewness, symmetric behavior, and over- and under-dispersion. Moreover, it is self decomposable and infinitely divisible, which makes the proposed distribution well suited for count data modeling. Other properties are investigated, including probability generating function, ordinary moments, factorial moments, negative moments and characterization. Estimation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characterization; Discrete distributions; Estimation; Vuong test statistic; Mixture distributions; Thunderstorms data.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602617

Carbon and strontium isotope record on the vendian-tommotian transition in the NW Argentina
Provedor de dados: 42
Autores: SIAL,ALCIDES N.; FERREIRA,VALDEREZ P.; PIMENTEL,MÁRCIO M.; TOSELLI,ALEJANDRO J.; ACENOLAZA,FLORENCIO G.; ALONSO,RICARDO N.; PARADA,MIGUEL A.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300031

Genetic diversity of the sunflower caterpillar (Chlosyne lacinia saundersii Doubleday and Hewitson) (Lepidoptera: Nymphalidae) populations determined by molecular RAPD markers
Provedor de dados: 42
Autores: Cunha,Fabiane; Gómez,Daniel R. Sosa; Silva,Jose J. da; Alexandre,Talita M.; Moscardi,Flávio.
Chlosyne lacinia saundersii is one of the most important pests of sunflower and it is the main target of insecticides applications. Larvae were collected in Londrina (PR), Santa Maria (RS), Dourados (MS), Ribeirão Preto (SP), Brasília (DF), Barreiras (BA), Uberaba (MG) and Vilhena (RO). Genomic DNA was extracted and amplified with ten-mer primers, which produced 101 loci. The size of the RAPD amplicons ranged from 180 to 2564 bp. Polymorphism among populations ranged from 31% to 67%, with the highest polymorphisms of 57% and 67% being detected in Uberaba and Vilhena populations, respectively. Populations with the highest similarity determined with Dice coefficient were from Ribeirão Preto and Barreiras, while insects from Londrina showed the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amova; Gene flow; Molecular marker; Sunflower pest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400029

Photosynthetic capacity and water use efficiency in Ricinus communis (L.) under drought stress in semi-humid and semi-arid areas
Provedor de dados: 42
Autores: SANTOS,CLAUDIANA M. DOS; ENDRES,LAURÍCIO; FERREIRA,VILMA M.; SILVA,JOSÉ V.; ROLIM,EDUARDO V.; WANDERLEY FILHO,HUMBERTO C.L.
ABSTRACT Castor bean is one of the crops with potential to provide raw material for production of oils for biodiesel. This species possess adaptive mechanisms for maintaining the water status when subjected to drought stress. A better understanding these mechanisms under field conditions can unravel the survival strategies used by this species. This study aimed to compare the physiological adaptations of Ricinus communis (L.) in two regions with different climates, the semi-arid and semi-humid subject to water stress. The plants showed greater vapor pressure deficit during the driest hours of the day, which contributed to higher values of the leaf temperature and leaf transpiration, however, the VPD(leaf-air) had the greatest effect on plants in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ricinus communis L.; Water deficit; Stomatal control; Photoinhibition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603015

Articles with authors affiliated to Brazilian institutions published from 1994 to 2003 with 100 or more citations: I - the weight of international collaboration and the role of the networks
Provedor de dados: 42
Autores: Packer,Abel L.; Meneghini,Rogerio.
Articles with 100 citations or more in the scientific literature and with at least one author with Brazilian affiliation, were identified in the Thomson-ISI (Institute for Scientific Information) Web of Science bibliometric database, covering a 10-year period, from 1994 to 2003; 248 (0.23%) out of a total of 109,916 articles with Brazilian affiliation were identified. This study was primarily carried out to identify thematic nuclei of excellence in research that had major impact in the international literature (Meneghini and Packer 2006). The regional and institutional affiliation distributions of these articles follow approximately that of the total of Brazilian articles in the ISI database. However, some significant deviations are observed derived from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometry; Editing/statistics and numerical data; Information service; Storage and retrieval information; Science; Authorship; Journals/rules; Scientometrics; Impact factor; Scientific collaboration; Scientific network.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400017

Improving methods for epidemiological control of canine visceral leishmaniasis based on a mathematical model. Impact on the incidence of the canine and human disease
Provedor de dados: 42
Autores: Palatnik-de-Sousa,Clarisa B.; Batista-de-Melo,Leopoldina M.; Borja-Cabrera,Gulnara P.; Palatnik,Marcos; Lavor,Carlile C.
The mathematical model described by Dye (1996) condemned the epidemiological canine visceral leishma-niasis control campaign, considering it non-efficient. Using this model, we mathematically demonstrate that the control is not efficient, only at low values (rate at which latent and infectious dogs are lost by the destruction program) which match the canine seropositivity observed in the field by the immunofluorescency (IF) blood eluates analysis. With higher k values, corresponding to IF (k = 0.07) or ELISA ( k = 0.25) results in sera samples, the number of infectious dogs declines to a Ro =1 or Ro =0, respectively, interrupting the transmission and the advancement of epidemics. We also experimentally demonstrate that the dog removal, following the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canine visceral leishmaniasis; Epidemiological control; Immunofluorescent assay.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300012

Glutathione redox cycle in small intestinal mucosa and peripheral blood of pediatric celiac disease patients
Provedor de dados: 42
Autores: Stojiljković,Vesnać; Pejić,SnežAna; Kasapović,Jelena; Gavrilović,Ljubicać; Stojiljković,Stanimirć; Nikolić,Draganć; Pajović,SnežAna B.
The celiac disease is an autoimmune gastrointestinal disorder caused by gluten from wheat, rye or barley. In genetically predisposed persons, gluten induces the immune-mediated inflammation of small intestinal mucosa. Histological lesions include intraepithelial lymphocytosis, crypt hypertrophy and villous atrophy, resulting in malabsorption of micro- and macronutrients. The only treatment for celiac patients is a permanent gluten-free diet (GFD). Reactive oxygen species (ROS) and oxidative stress are strongly associated with the celiac disease. Glutathione (GSH) is a main detoxifier of endogenous and exogenous ROS in the intestine. In order to explain the role of glutathione redox cycle in celiac patients, we examined the activities of GSH-related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Celiac disease; Glutathione.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100018

Neuroscience: unveiling the brain of Saimiri collinsi (Squirrel Monkey)
Provedor de dados: 42
Autores: BRANCO,ÉRIKA; SENA,CAROLINE S.P. DE; PANTOJA,LUCIANA F.; SOARES,PAOLA C.; LIMA,ANA RITA DE.
Abstract Behavioral intelligence among non-human primates is a somewhat puzzling area to study, since it is closely linked to the morphology of the central nervous system. However, this morphology is still unknown to science in the case of Saimiri collinsi. As a means of assisting future studies on the social behavior of this species, we analyzed the brains of six adult females from the National Primate Center / Pará, which were sent to the Animal Morphological Research Laboratory at the Federal Rural University of Amazônia after death by natural causes. The animals were fixed in formaldehyde solution (10%) and dissected. The brains were covered externally by the dura mater, with long cerebral hemispheres, although there was a complete absence of gyri. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal behavior; Brain morphology; Cognition; Encephalon; Neuroanatomy; Saimiri collinsi.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703597

SEM observation of grain boundary structures in quartz-iron oxide rocks deformed at intermediate metamorphic conditions
Provedor de dados: 42
Autores: Lagoeiro,Leonardo; Gonçalves,Cristiane C.
Several studies have demonstrated the effect of a second phase on the distribution of fluid phase and dissolution of quartz grains. However, as most observations came from aggregates deformed under hydrostatic stress conditions and mica-bearing quartz rocks, 3-D distribution of pores on quartz-quartz (QQB) and quartz-hematite boundaries (QHB) has been studied. Several fracture surfaces oriented according to finite strain ellipsoid were analyzed. The pore distribution characterizes the porosity and grain shape as highly anisotropic, which results from the nature and orientation of boundaries. QHB have physical/chemical properties very different from QQB, once the hematite plates have strong effect on wetting behavior of fluid, likewise micas in quartzites....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deformation mechanisms; Fluid distribution; Grain growth; Porosity; Solution transfer.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300009

On the fossil Remains of Panochthus Burmeister, 1866 (Xenarthra, Cingulata, Glyptodontidae) from the Pleistocene of southern Brazil
Provedor de dados: 42
Autores: Ferreira,José D.; Zamorano,Martín; Ribeiro,Ana Maria.
The genus Panochthus represents the last lineage of "Panochthini" recorded in the Pleistocene. This genus has a wide latitudinal distribution in South America, and in Brazil it occurs in the southern and northeastern regions. In this paper we describe new material (isolated osteoderms and caudal tube fragments) assigned to Panochthus from the state of Rio Grande do Sul (southern Brazil) and discuss some taxonomic issues related to Panochthus tuberculatus and Panochthus greslebini based on this material . The occurrence of P. greslebini is the first for outside the Brazilian Intertropical Region. In addition, we describe new diagnostic features to differentiate the osteoderms of P. greslebini and P. tuberculatus. Unfortunately, it was not possible to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glyptodontidae; Panochthus; Pleistocene; Southern Brazil; Osteoderms.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100015

Physiopathological modulators of amyloid aggregation and novel pharmacological approaches in Alzheimer's disease
Provedor de dados: 42
Autores: DEFELICE,FERNANDA G.; FERREIRA,SÉRGIO T.
The biological mechanisms underlying the neuropathology of Alzheimer's disease (AD) are complex, as several factors likely contribute to the development of the disease. Therefore, it is not surprising that a number of different possible therapeutic approaches addressing distinct aspects of this disease are currently being investigated. Among these are ways to prevent amyloid aggregation and/or deposition, to prevent neuronal degeneration, and to increase brain neurotransmitter levels. Here, we discuss possible roles of endogenous modulators of Abeta aggregation in the physiopathology of AD and some of the strategies currently under consideration to interfere with brain levels of beta-amyloid, its aggregation and neurotoxicity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alzheimer's disease; Abeta peptide; Aggregation; Neurotoxicity; Physiopathological modulators.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200006

Gelatin in replacement of bovine heart in feed training ofLophiosilurus alexandri in different water salinities
Provedor de dados: 42
Autores: SALARO,ANA LUCIA; OLIVEIRA JUNIOR,JOSÉ C.; LIMA,FREDERICO W.; FERRAZ,RENATO B.; PONTES,MARCELO D.; CAMPELO,DANIEL A.V.; ZUANON,JENER A.S.; LUZ,RONALD K.
ABSTRACT The aim of this study was to evaluate commercial gelatin in the total replacement of bovine heart in feed training of "pacamã" Lophiosilurus alexandri in different water salinities. A completely randomized experimental design, in a 2 × 3 factorial arrangement, was performed using two types of moist ingredients (bovine heart and gelatin) and three water salinities (0.0; 2.0 and 4.0 g of salt L-1) with three replications. Juveniles (2.39 ± 0.08 cm standard length and 0.20 ± 0.03 g of weight) were conditioned to accept commercial diets by the technique of the gradual transition of ingredients. At the end of 36 days no differences were observed to weight gain, length gain and specific growth rate. The feed training efficiency was better (P &lt; 0.05)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carnivorous fish; Feed training efficiency; Management efficiency; Neotropical fish.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502281

Analog Models of Flanking Structures and a Natural Example in the Quadrilátero Ferrífero, Minas Gerais
Provedor de dados: 42
Autores: GOMES,CAROLINE J.S.; RODRIGUES,BRAULIO A.; ENDO,ISSAMU.
ABSTRACT The aim of this study is to present analog models of flanking structures and to analyze the Fábrica Nova synform, Quadrilátero Ferrífero, Minas Gerais, from a geometric point of view. We set up seven models using a linear viscous silicone and produced flanking structures with a shear velocity of 2 cm h-1. At different initial orientations with respect to the shear zone boundary, a rigid cross-cutting element with lubricated boundaries was deformed via sinistral bulk flow at a shear strain of γ = 1.28. The most interesting features of our experiments are the geometries of the different marker lines, which are heterogeneous and resulted from thickening and thinning of the silicone at the cross-cutting element terminations. To compare our analog...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physical modelling; Flanking folds; Silicone; Fábrica Nova synform.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401431

Structural Properties of the Brazilian Air Transportation Network
Provedor de dados: 42
Autores: COUTO,GUILHERME S.; SILVA,ANA PAULA COUTO DA; RUIZ,LINNYER B.; BENEVENUTO,FABRÍCIO.
The air transportation network in a country has a great impact on the local, national and global economy. In this paper, we analyze the air transportation network in Brazil with complex network features to better understand its characteristics. In our analysis, we built networks composed either by national or by international flights. We also consider the network when both types of flights are put together. Interesting conclusions emerge from our analysis. For instance, Viracopos Airport (Campinas City) is the most central and connected airport on the national flights network. Any operational problem in this airport separates the Brazilian national network into six distinct subnetworks. Moreover, the Brazilian air transportation network exhibits small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian air transportation network; Network science; Structural network analysis; Complex networks.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401653

Functionomics: the analysis of a postgenomic concept on the basis of pregenomic pharmacological studies in smooth muscle
Provedor de dados: 42
Autores: Jurkiewicz,Aron; Caricati-Neto,Afonso; Jurkiewicz,Neide H.
The term functionomics (Amin 2003, Neumann et al. 2004) refers to a postgenomic integrated Systems Biology (Attur et al. 2002) using a multidimensional approach for cells, tissues and organs. It considers current or future involvement among genomics, proteomics or metabolomics, including the main factors that cause biological responses and modulation under different conditions. Our objective in the present review is to summarize the contemporary understanding of functionomics of smooth muscle pharmacology, based on the results obtained on the pregenomic era during several years in our laboratory. The present approach is based on the knowledge of the dynamics of the receptor system, which comprises a cascade of phenomena, leading from the drug...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functionomics; Receptor; Smooth muscle; Genomic.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300022

Portal hypertensive response to kinin
Provedor de dados: 42
Autores: Kouyoumdjian,Maria; Nagaoka,Marcia R.; Loureiro-Silva,Mauricio R.; Borges,Durval R.
Portal hypertension is the most common complication of chronic liver diseases, such as cirrhosis. The increased intrahepatic vascular resistance seen in hepatic disease is due to changes in cellular architecture and active contraction of stellate cells. In this article, we review the historical aspects of the kallikrein-kinin system, the role of bradykinin in the development of disease, and our main findings regarding the role of this nonapeptide in normal and experimentalmodels of hepatic injury using the isolated rat liver perfusion model (mono and bivascular) and isolated liver cells. We demonstrated that: 1) the increase in intrahepatic vascular resistance induced by bradykinin is mediated by B2 receptors, involving sinusoidal endothelial and stellate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bradykinin; Hepatic metabolism; Portal hypertension; Bradykinin receptors.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300008

First record of an anomalously colored franciscana dolphin, Pontoporia blainvillei
Provedor de dados: 42
Autores: CREMER,MARTA J.; SARTORI,CAMILA M.; SCHULZE,BEATRIZ; PAITACH,RENAN L.; HOLZ,ANNELISE C.
On October 2011, a newborn franciscana dolphin with an anomalously coloration was sighted in Babitonga Bay, southern Brazil. The calf was totally white. Besides the potential mother and newborn, the group also had the presence of another adult, who always was swimming behind the pair. Both adults had the typical coloration of the species, with the back in grayish brown. The group, composed by the white franciscana calf, his pontential mother and one more adult, was reported in five occasions. The group was always in the same area where it was first recorded and showed the same position during swimming. Between first and last sighting of the white calf (113 days) the color has not changed. This is the first case of a white franciscana dolphin. This...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anomalously coloration; Pontoporia blainvillei; Franciscana dolphin; Albinism; Babitonga Bay.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301221

Management of gillnet fisheries in the south coast of the state of São Paulo, Brazil
Provedor de dados: 42
Autores: MENDONÇA,JOCEMAR T.; PEREIRA,ALINEIDE L.C.
Gillnetting is one of the most practiced fishing methods adopted in the South of Brazil and has been increasingly expanding over the last years. This paper presents the characterization of the activity and discusses its management, in accordance to results from the discussions on the development of regulations on net fisheries in the South Coast Marine Protected Area (APAMLS) in the state of São Paulo. Gillnet fleets are formed by small-scale boats, with low autonomy, and lower fishing capacity, when compared to boats from other ports in the South and Southeast. However, the number of fishing units is high, reaching 1,709 units operating in the South coast of São Paulo in 2010. This kind of fleet uses several types of gillnets, and the activity may be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation unit; Co-management; Brazil; Gillnet; Fishery assessment; APA Marine South.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301227

Niche overlap analysis of a lizard assemblage from the Atlantic Rainforest, evaluation of arsenic toxicity in cladocerans, and molecular biology of mycoplasmas
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200437

Effects of two bisbenzylisoquinoline alkaloids, Antioquine and Tetrandrine, compared to Verapamil in Rat Thoracic Aorta
Provedor de dados: 42
Autores: MARTINEZ,JOSÉ L.; BENITES,JULIO; GOMEZ,HAROLD; VARGAS-RUEDA,SILVIA; VINET,RAÚL; JAIMES,LUISAURIS; LAURIDO,CLAUDIO.
ABSTRACT The objective of this study was to compare two alkaloids (antioquine and tetrandrine) with verapamil; knowing that the smooth muscle respond to KCl and relationships with calcium. The effects of antioquine and tetrandrine, was studied in adults Wistar rat with modified methods used in the determination of aorta contractility and compared with verapamil effect in the same assays. The analysis of the effect of a drug or extract on aortic reactivity included maximal relaxation or maximal contraction (Cmax) (Phase 1). In our results, verapamil induced a blockade of 98.7 ± 0.7% (n = 6) in presence of endothelium and 97.9 ± 4.3% in ausence of endothelium, both in phase 1 and in phase 2 of 47.4 ± 4.1% (n = 6) in aortas in the presence of endothelium and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioquine; Tetrandrine; Verapamil; Calcium antagonism; Rat thoracic aorta.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401459

The predator Coenosia Attenuata Stein (Diptera, Muscidae) on cultivated plants from Brazil
Provedor de dados: 42
Autores: COURI,MÁRCIA S.; SOUSA,VIVIANE R. DE; LIMA,RAFAEL M.; DIAS-PINI,NIVIA S.
ABSTRACT Coenosia attenuata Stein (1903) is a predatory fly that is commonly found in greenhouses and open fields preying on whiteflies, leafminers, psocopterans and other insects. The species is widespread in the Old World and its distribution has expanded in recent times to Neotropical countries including Chile, Colombia, Costa Rica, Ecuador and Peru. We report here for the first time the presence of C. attenuata in Brazil, occurring in different sites in the State of Ceará (Northeastern Brazil). Expansion of the distribution range of this muscid to the eastern parts of South America opens up the possibility of applying the beneficial predator as a biological control agent for protected crops of the region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Geographical distribution; Hunter-fly; Natural enemy; Tiger-fly.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100179

Sr and Nd isotopic characteristics of 1.77-1.58 Ga rift-related granites and volcanics of the Goiás tin province, central Brazil
Provedor de dados: 42
Autores: PIMENTEL,MÁRCIO M.; BOTELHO,NILSON F.
Supracrustal rocks of the Araí Group, together with coeval A-type granites represent a ca. 1.77-1.58 Ga old continental rift in Brazil. Two granite families are identified: the older (1.77 Ga) group forms small undeformed plutons, and the younger granites (ca. 1.58 Ga) constitute larger, deformed plutons. Sr-Nd isotopic data for these rocks indicate that the magmatism is mostly product of re-melting of Paleoproterozoic sialic crust. Initial Sr ratios for both granite families are ca 0.726 and 0.720. Most TDM model ages are between 2.58 and 1.80 Ga. epsilonND(T) values are between +3.6 and -11.9. Araí volcanics are bimodal, with basalts and dacites/rhyolites interlayered with continental sediments. The felsic volcanics show Nd isotopic characteristics which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sr-Nd isotopes; Paleoproterozoic; Tin granites; Transamazonian.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200010

Comparative analysis of two different models of swimming applied to pregnant rats born small for pregnant age
Provedor de dados: 42
Autores: CORVINO,SILVANA B.; DAMASCENO,DÉBORA C.; SINZATO,YURI K.; NETTO,ALINE O.; MACEDO,NATHÁLIA C.D.; ZAMBRANO,ELENA; VOLPATO,GUSTAVO T.
ABSTRACT The aim of this study was to compare two models of swimming applied to pregnant rats born small for pregnancy age (SPA). Diabetes was chemically induced in adult female rats to develop an inadequate intrauterine environment, leading to birth of a SPA offspring. In adulthood, the female SPA rats were mated and submitted to different swimming programs. The exercise program 1 (Ex1) consisted of swimming for 15 minutes, followed by 15 minutes of rest and another 15 minutes of swimming, 3 days a week before and during pregnancy. Another program (Ex2) was applied during 60 minutes uninterrupted a day, 6 days/week during pregnancy. The pregnant rats presented no interference on body weight and glycemia. The rats submitted to Ex2 model showed decreased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rats; Diabetes; Pregnancy; Offspring; Exercise.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100223

Horse spleen segmentation technique as large animal model of preclinical trials
Provedor de dados: 42
Autores: Foz Filho,Roberto P.P.; Martin,Benedito W. de; Lima,Ana Rita de; Miglino,Maria Angélica.
The parenchymal distribution of the splenic artery was studied in order to obtain anatomical basis for partial splenectomy. Thirty two spleens were studied, 26 spleens of healthy horses weighing 320 to 450kg, aged 3 to 12 years and 6 spleens of fetus removed from slaughterhouse. The spleens were submitted to arteriography and scintigraphy in order to have their vascular pattern examined and compared to the external aspect of the organ aiming establish anatomo-surgical segments. All radiographs were photographed with a digital camera and the digital images were submitted to a measuring system for comparative analysis of areas of dorsal and ventral anatomo-surgical segments. Anatomical investigations into the angioarchitecture of the equine spleen showed a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arteriography; Equine; Scintigraphy; Spleen; Splenic artery.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401411

Chlorophyll a spatial inference using artificial neural network from multispectral images and in situ measurements
Provedor de dados: 42
Autores: FERREIRA,MONIQUE S.; GALO,MARIA DE LOURDES B.T.
Considering the importance of monitoring the water quality parameters, remote sensing is a practicable alternative to limnological variables detection, which interacts with electromagnetic radiation, called optically active components (OAC). Among these, the phytoplankton pigment chlorophyll a is the most representative pigment of photosynthetic activity in all classes of algae. In this sense, this work aims to develop a method of spatial inference of chlorophyll a concentration using Artificial Neural Networks (ANN). To achieve this purpose, a multispectral image and fluorometric measurements were used as input data. The multispectral image was processed and the net training and validation dataset were carefully chosen. From this, the neural net...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing of water; Fluorescence; Chlorophyll a; Spatial inference; Artificial neural network.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200519

Diversity of scale insects (Hemiptera, Coccomorpha) in ten varieties of olive trees (Olea europaea L.) in Southern Brazil
Provedor de dados: 42
Autores: WOLFF,VERA R.S.; EFROM,CAIO F.S.; SILVA,DANIELE C. DA; TONIETTO,ADILSON.
Abstract Olive production (Olea europaea L.) is a recent activity in Brazil and studies on the adaptability of olive trees varieties in the States are required. One of the problems that can hamper the development of olive trees is the incidence of pests, such as scale insects (Hemiptera, Coccomorpha). In this study, the associated scale insect species were found in ten varieties in an olive grove located at the Research Center of the Serra do Sudeste Region (30º33’15”S, 52º23’45”W) in Brazil. The surveys were carried out twice in each season (2013-2014). Six species of armored scale insect (Diaspididae) and two soft scales (Coccidae) were determined. Saissetia oleae (Coccidae) with 88.15% and Aspidiotus nerii (Diaspididae) with 5.85% occurred in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptability; Coccidae; Diaspididae; Pest insects; Olive varieties.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703635

Injectivity of the Dirichlet-to-Neumann Functional and the Schwarzian Derivative
Provedor de dados: 42
Autores: Silva,Fernando A.F.C.; Venegas,Pedro A.G.; Ahumada,Ramón O.M.
In this article, we show the relation between the Schwartz kernels of the Dirichlet-to-Neumann operators associated to the metrics g0 and h = F* (e²φ g0) on the circular annulus A R, and the Schwarzian Derivative of the argument function f of the restriction of the diffeomorphism F to the boundary of A R.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annulus; Dirichlet-to-Neumann Functional; Schwarzian Derivative.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400003

An efficient certificateless blind signature scheme without bilinear pairing
Provedor de dados: 42
Autores: DONG,GUOFAGN; GAO,FEI; SHI,WENBO; GONG,PENG.
Recently, the certificateless public key cryptography (CLPKC) has been studied widely since it could solve both of the certificate management problem in traditional public key cryptography (TPKC) and the key escrow problem in the identity-based public key cryptography (ID-based PKC). To satisfy requirements of different applications, many certificateless blind signature (CLBS) schemes using bilinear pairing for the CLPKC setting have been proposed. However, the bilinear pairing operation is very complicated. Therefore, the performance of those CLBS schemes is not very satisfactory. To solve the problem, we propose an efficient CLBS scheme without bilinear pairing. Performance analysis shows that the proposed scheme could reduce costs of computation and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blind signature; Certificateless cryptography; Bilinear pairing; Random oracle model.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000201003

Equity, quality and relevance in higher education in Brazil
Provedor de dados: 42
Autores: Schwartzman,Simon.
Brazilian higher education has doubled its size in the 1990s, going from 1.5 million to more than 3 million students in the period. This expansion was mostly due to the growth of private education, which, in 2002, accounted for about two thirds of the enrollment. Is expansion making higher education more accessible to persons coming from the poorer segments of society? Is the quality of higher education suffering by the speed of this expansion? Is Brazil educating enough qualified persons to attend to the country's needs to participate in the new, knowledge-intensive and global economy? What public policies should be implemented, in order to foster the values of social equity and relevance? What are the policy implications of these developments? This...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Higher education; Human capital; Equity; Labor market; Education policy.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100015

Phosphorus availability and microbial immobilization in a Nitisol with the application of mineral and organo-mineral fertilizers
Provedor de dados: 42
Autores: MORAIS,FRANCISCO A.; GATIBONI,LUCIANO C.
ABSTRACT The aim of this study was to evaluate P availability, P and C contained in the microbial biomass, and enzymatic activity (acid phosphatases and β-glucosidases) in a Nitisol with the application of mineral and organo-mineral fertilizers. The experiment was performed in a protected environment with control over air temperature and soil moisture. The experimental design was organized in a "5 x 4" factorial arrangement with five sources of P and four times of soil incubation. The sources were: control (without P), triple superphosphate, diammonium phosphate, natural Arad reactive rock phosphate, and organo-mineral fertilizer. The experimental units consisted of PVC columns filled with agricultural soil. The columns were incubated and broken down for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative phosphate fertilizers; Phosphorus adsorption; Poultry waste management; Soil microbial biomass.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502289

High cellulolytic activities in filamentous fungi isolated from an extreme oligotrophic subterranean environment (Catão cave) in Brazil
Provedor de dados: 42
Autores: PAULA,CAIO C.P. DE; MONTOYA,QUIMI V.; MEIRELLES,LUCAS A.; FARINAS,CRISTIANE S.; RODRIGUES,ANDRÉ; SELEGHIM,MIRNA H.R.
Abstract Abstract: Isolation and screening of new fungal strains from extreme and understudied environments, such as caves, is a promising approach to find higher yields enzyme producers. Cellulolytic fungal strains isolated from a Brazilian cave were evaluated for their enzymatic production after submerged (SmF) and solid-state fermentation (SSF). After SmF, three strains were selected for their high enzymatic activities: Aspergillus ustus for endoglucanase (4.76 U/mg), Talaromyces bruneus for β-glucosidase (11.71 U/mg) and Aspergillus sp. (CBMAI 1926) for total cellulase (1.70 U/mg). After SSF, these strains, showed better yields compared to the reference strain Aspergillus niger 3T5B8. Aspergillus sp. (CBMAI 1926) stood out as a new species that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulases; Fungu’s cave; Solid state fermentation; Submerged fermentation; Subterranean environment.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500601

Microfossils in micrites from Serra da Bodoquena (MS), Brazil: taxonomy and paleoenvironmental implications
Provedor de dados: 42
Autores: Utida,Giselle; Petri,Setembrino; Oliveira,Emiliano C.; Boggiani,Paulo C.
Microfossils present in Quaternary micrites from Serra da Bodoquena, Mato Grosso do Sul State, Brazil, are here described for the first time. The studied taxa are: a) ostracods: Candona sp., Candonopsis sp., Cyclocypris sp., Cypria sp., Cypridopsis sp., Notodromas sp., Ilyocypris sp., Cyprideis sp., Wolburgiopsis cf. chinamuertensis (Musacchio 1970), Darwinula sp. and 5 morphotypes; b) microgastropod Acrobis sp., and c) Characeae remains and gyrogonites Chara sp.. The presence of these microfossils suggests clear-water shallow lacustrine paleoenvironments and the presence of aquatic vegetation. Similarities between microfossils and the living taxa suggest possible Holocene ages for these deposits, which is in accordance with previous C14 dates.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micrite; Characeae; Lacustrine sediments; Ostracoda; Serra da Bodoquena.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200003

Production and performance of sugarcane seeds (caryopses) from different hybridizations involving RB92579
Provedor de dados: 42
Autores: DINIZ,CARLOS A.; FERREIRA,VILMA M.; SILVA,CLÍSSIAB. DA; BARBOSA,GERALDO V.S.; ARAÚJO NETO,JOÃO C. DE; SANTOS,JOÃO M. DOS.
Abstract A major challenge in sugarcane breeding program is the obtaining of enough number of seeds (caryopses) for the development of new improved cultivars. Genotypes differ in their function as pollen recipient and pollen donor, which also affect the seed performance. Thus, the aim of this study was to verify the production and performance of sugarcane seeds from different hybridizations involving RB92579 as pollen recipient and pollen donor. Twelve bi-parental crossings were carried out involving RB92579 and other different genotypes randomly chosen. Seed production potential was evaluated by percentage of fertile spikelets and caryopsis fresh weight. The seed physiological potential was determined by evaluating germination and vigor (index of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertile spikelets; Pollen donor; Pollen recipient; Saccharum spp.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703243

Performance assessment of the database downscaled ocean waves (DOW) on Santa Catarina coast, South Brazil
Provedor de dados: 42
Autores: Silva,Paula G.; Klein,Antonio H.F.; González,Mauricio; Gutierrez,Omar; Espejo,Antonio.
This work presents a validation of wave parameters from the new sixty years Downscaled Ocean Waves (DOW) reanalysis database. This study compares quantiles of the Gumbel distribution of Hs (significant wave height) and Tp (peak period) from simulated data with an 11 months' time series obtained from a buoy moored seaward on the Santa Catarina coast. Analysis by means of Gumbel distribution quantiles allows more weight to be given to the highest values of the time series, which are especially important in design projects. The statistical parameters used to verify the fit between the measured and the modeled data included: RMSE, BIAS, Scatter Index and Pearson Correlation Coefficient. Mean direction (θm) validation was conducted qualitatively. The database...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DOW; Validation; Wave reanalysis; WAVEWATCHIII.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200623

Automorphisms and non-integrability
Provedor de dados: 42
Autores: Pereira,Jorge V.; Sánchez,Percy F.
On this note we prove that a holomorphic foliation of the projective plane with rich, but finite, automorphism group does not have invariant algebraic curves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic Foliations; Jouanolou Theorem.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300001

Organic Synthesis: New Vistas in the Brazilian Landscape
Provedor de dados: 42
Autores: PILLI,RONALDO A.; ASSIS,FRANCISCO F. DE.
ABSTRACT In this overview, we present our analysis of the future of organic synthesis in Brazil, a highly innovative and strategic area of research which underpins our social and economical progress. Several different topics (automation, catalysis, green chemistry, scalability, methodological studies and total syntheses) were considered to hold promise for the future advance of chemical sciences in Brazil. In order to put it in perspective, contributions from Brazilian laboratories were selected by the citations received and importance for the field and were benchmarked against some of the most important results disclosed by authors worldwide. The picture that emerged reveals a thriving area of research, with new generations of well-trained and productive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic synthesis; Frontiers; Overview; Brazilian scenario.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200895

Growth curve by Gompertz nonlinear regression model in female and males in tambaqui (Colossoma macropomum)
Provedor de dados: 42
Autores: MELLO,FERNANDA DE; OLIVEIRA,CARLOS A.L.; RIBEIRO,RICARDO P.; RESENDE,EMIKO K.; POVH,JAYME A.; FORNARI,DARCI C.; BARRETO,ROGÉRIO V.; MCMANUS,CONCEPTA; STREIT JR,DANILO.
ABSTRACT Was evaluated the pattern of growth among females and males of tambaqui by Gompertz nonlinear regression model. Five traits of economic importance were measured on 145 animals during the three years, totaling 981 morphometric data analyzed. Different curves were adjusted between males and females for body weight, height and head length and only one curve was adjusted to the width and body length. The asymptotic weight (a) and relative growth rate to maturity (k) were different between sexes in animals with ± 5 kg; slaughter weight practiced by a specific niche market, very profitable. However, there was no difference between males and females up to ± 2 kg; slaughter weight established to supply the bigger consumer market. Females showed weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gompertz curve; Body growth; Maximum growth rate; Slaughtered point.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502309

Editors of Brazilian journals - a hard life that is getting harder!
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100001

A comparative expression analysis of gene transcripts in brain tissue of non-transgenic and GH-transgenic zebrafish (Danio rerio) using a DDRT-PCR approach
Provedor de dados: 42
Autores: Alves-Costa,Fernanda A.; Figueiredo,Márcio A.; Lanes,Carlos F.C.; Almeida,Daniela V.; Marins,Luis F.; Wasko,Adriane P.
The presence of higher level of exogenous growth hormone (GH) in transgenic animals could lead to several physiological alterations. A GH transgenic zebrafish (Danio rerio) line was compared to nontransgenic (NT) samples of the species through a DDRT-PCR approach, with the goal of identifying candidate differentially expressed transcripts in brain tissues that could be involved in GH overexpression. Densitometric analyses of two selected amplification products, p300 and ADCY2, pointed to a significant lower gene expression in the transgenic zebrafish (104.02 ± 57.71; 224.10 ± 91.73) when compared to NT samples (249.75 ± 30.08; 342.95 ± 65.19). The present data indicate that p300 and ADCY2 are involved in a regulation system for GH when high circulating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Differential display; GH; Growth hormone; Transgenic; Zebrafish.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200017

Taxonomic revision of the flea genus AgastopsyllaJordan &amp;amp; Rothschild 1923 (Siphonaptera: Ctenophthalmidae)
Provedor de dados: 42
Autores: LÓPEZ-BERRIZBEITIA,MARIA FERNANDA; SANCHEZ,JULIANA; BARQUEZ,RUBEN MARCOS; DÍAZ,MÓNICA.
Abstract  Fleas of Argentina are receiving renewed systematic interest, but the identification of many species associated with small mammals can be problematic. We review the taxonomy of the flea genus Agastopsylla including the re-description of two species and one subspecies, and designate neotype and neallotype for Agastopsylla hirsutior, neotype for Agastopsylla nylota nylota from the “Colección Mamíferos Lillo Anexos” (CMLA), Universidad Nacional de Tucumán, Argentina, and neotype and neallotype for Agastopsylla pearsoni from the Natural History Museum (London, U.K.). Additionally, a key to identification of the species of Agastopsylla and a distribution map of the species of the genus are included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fleas; Systematic; Type specimens; Rodents; Key identification.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100719

Late Pleistocene carnivores (Carnivora: Mammalia) from a cave sedimentary deposit in northern Brazil
Provedor de dados: 42
Autores: RODRIGUES,SHIRLLEY; AVILLA,LEONARDO S.; SOIBELZON,LEOPOLDO H.; BERNARDES,CAMILA.
The Brazilian Quaternary terrestrial Carnivora are represented by the following families: Canidae, Felidae, Ursidae, Procyonidae Mephitidae and Mustelidae. Their recent evolutionary history in South America is associated with the uplift of the Panamanian Isthmus, and which enabled the Great American Biotic Interchange (GABI). Here we present new fossil records of Carnivora found in a cave in Aurora do Tocantins, Tocantins, northern Brazil. A stratigraphical controlled collection in the sedimentary deposit of the studied cave revealed a fossiliferous level where the following Carnivora taxa were present: Panthera onca, Leopardus sp., Galictis cuja, Procyon cancrivorus, Nasua nasua and Arctotherium wingei. Dating by Electron Spinning Resonance indicates that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carnivora; Fossil record; Pleistocene; South America.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401641

On holomorphic one-forms transverse to closed hypersurfaces
Provedor de dados: 42
Autores: Ito,Toshikazu; Scárdua,Bruno.
In this note we announce some achievements in the study of holomorphic distributions admitting transverse closed real hypersurfaces. We consider a domain with smooth boundary in the complex affine space of dimension two or greater. Assume that the domain satisfies some cohomology triviality hypothesis (for instance, if the domain is a ball). We prove that if a holomorphic one form in a neighborhood of the domain is such that the corresponding holomorphic distribution is transverse to the boundary of the domain then the Euler-Poincaré-Hopf characteristic of the domain is equal to the sum of indexes of the one-form at its singular points inside the domain. This result has several consequences and applies, for instance, to the study of codimension one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holomorphic one-form; Vector field; Euler-Poincaré characteristic; Foliation; Distribution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300001

Role of renin-angiotensin system in development of heart failure induced by myocardial infarction in rats
Provedor de dados: 42
Autores: Trindade,Daniel C.; Trindade,Raquel C.; Marassi,Michelle P.; Martins,Ornélia P.P.R.; Costa-e-Sousa,Ricardo H.; Mattos,Elisabete C.; Marinho-Jr.,Alcides; Reis,Luís C.; Olivares,Emerson L.
We investigated the morphologic and functional changes of infarcted rat hearts under a paradigm of angiotensinconverting enzyme inhibition. Myocardial infarction was induced by left coronary artery ligation and a control group (SHAM) underwent sham-operation. Infarcted rats received normal drinking water with (CAP group) or without (INF group) captopril. Functional assessment was performed by electro (ECG) and echocardiogram (ECHO) just before and 21 days after surgery. The ECG of INF and CAP showed similar values and resembled healed infarct after surgery. The most outstanding differences between INF and CAP were the prevention of the increase of P-wave and attenuation both in rightward deviation of the QRS axis and Q-wave amplitude in CAP compared with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myocardial infarction; Electrocardiogram; Echocardiogram; Renin-angiotensin system; Captopril.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200008

Melliferous flora and pollen characterization of honey samples of Apis mellifera L., 1758 in apiaries in the counties of Ubiratã and Nova Aurora, PR
Provedor de dados: 42
Autores: SEKINE,ELIZABETE S.; TOLEDO,VAGNER A.A.; CAXAMBU,MARCELO G.; CHMURA,SUZANE; TAKASHIBA,ELIZA H.; SEREIA,MARIA JOSIANE; MARCHINI,LUÍS C.; MORETI,AUGUSTA C.C.C.
The aim of this study was to carry out a survey of the flora with potential for beekeeping in the counties of Ubiratã and Nova Aurora-PR through the collection of plants and pollen analyses in honey samples collected monthly. 208 species of plants were recorded, distributed in 66 families. The families that showed the major richness of pollen types were: Asteraceae, Myrtaceae and Solanaceae. Approximately 80 pollen types were found in honey samples, most of them were characterized as heterofloral. Cultivated plants, such as Glycine max (soybean) and Eucalyptus spp., were representative in some months of the year. Exotic species, such as Ricinus communis and Melia azedarach, were also frequent. However, over than 50% of the pollen types belong to native...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beekeeping; Bee plants; Floral resources; Floristic survey.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100307

First evidence of the Ediacaran fauna in Northeastern Brazil, an albino dolphin, and trophic groups of a bird community in Alagoas
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301013

Resveratrol and resveratrol-hydroxypropyl-β-cyclodextrin complex recovered the changes of creatine kinase and Na+, K+-ATPase activities found in the spleen from streptozotocin-induced diabetic rats
Provedor de dados: 42
Autores: KOLLING,JENIFER; KOLLING,JANAÍNA; FRANCESCHI,ITIANE D. DE; NISHIHIRA,VIVIAN S.K.; BALDISSERA,MATHEUS D.; PINTO,CLÁUDIA G.; MEZZOMO,NATHANA J.; CARMO,GUILHERME M. DO; FEKSA,LUCIANE R.; FERNANDES,LIANA S.; ORENGO,GILBERTO; VAUCHER,RODRIGO A.; GIONGO,JANICE L.; WYSE,ANGELA T.S.; WANNMACHER,CLOVIS M.D.; RECH,VIRGINIA C.
Abstract: Type 1 diabetes (T1D) is the result of the selective destruction of the pancreatic β-cells by T cells of the immune system. Although spleen is a secondary lymphoid organ, it is also involved in the T1D pathogenesis. However, the alterations in a variety of cellular processes of this disease need to be further understood. We aimed to analyze the benefits of resveratrol, and its complexed form on diabetic complications in the spleen of rats. To this end, we investigated important enzymes of phosphoryl transfer network, and Na+, K+-ATPase activity. Wistar rats were divided into non-diabetic groups: Control, Ethanol, Resveratrol, Hydroxypropyl-β-cyclodextrin, Resveratrol-hydroxypropyl-β-cyclodextrin, and diabetic groups with the same treatments....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy metabolism; Hydroxypropyl-β-cyclodextrin; Hyperglycemia; Nanotecnology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500701

The pentose phosphate pathway in Trypanosoma cruzi: a potential target for the chemotherapy of Chagas disease
Provedor de dados: 42
Autores: Igoillo-Esteve,Mariana; Maugeri,Dante; Stern,Ana L.; Beluardi,Paula; Cazzulo,Juan J.
Trypanosoma cruzi is highly sensitive to oxidative stress caused by reactive oxygen species. Trypanothione, the parasite's major protection against oxidative stress, is kept reduced by trypanothione reductase, using NADPH; the major source of the reduced coenzyme seems to be the pentose phosphate pathway. Its seven enzymes are present in the four major stages in the parasite's biological cycle; we have cloned and expressed them in Escherichia coli as active proteins. Glucose 6-phosphate dehydrogenase, which controls glucose flux through the pathway by its response to the NADP/NADPH ratio, is encoded by a number of genes per haploid genome, and is induced up to 46-fold by hydrogen peroxide in metacyclic trypomastigotes. The genes encoding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Chagas disease; Pentose phosphate pathway; Oxidative stress; NADPH generation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400007

Metallic Phthalocyanines: impact of the film deposition method on its supramolecular arrangement and sensor performance
Provedor de dados: 42
Autores: MAXIMINO,MATEUS D.; MARTIN,CIBELY S.; PEREIRA,MATHEUS S.; ALÉSSIO,PRISCILA.
Abstract Th﻿is short review gives a concise overview of the impact of deposition methods on the supramolecular arrangement of metallic phthalocyanine films and their applications. Primarily, an introduction about the possible phthalocyanine molecular structures and derivatives obtained from modification on the phthalocyanine rings was presented. The possibility of perfecting/improving the supramolecular arrangement of metallic phthalocyanine (MPcs) films by using different deposition techniques such as Langmuir-Blodgett (LB), Langmuir-Schaefer (LS), Layer-by-Layer (LbL), physical vapor deposition (PVD) and electrodeposition was discussed in further details. Herein, we highlighted some techniques used on the characterization of supramolecular arrangement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Film deposition methods; Metallic phthalocyanines; Sensing applications; Supramolecular arrangement.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700301

Detection and quantification of human adenovirus genomes in Acanthamoeba isolated from swimming pools
Provedor de dados: 42
Autores: STAGGEMEIER,RODRIGO; ARANTES,THALITA; CAUMO,KARIN S.; ROTT,MARILISE B.; SPILKI,FERNANDO R.
ABSTRACT Acanthamoeba is the most common free-living environmental amoeba, it may serve as an important vehicle for various microorganisms living in the same environment, such as viruses, being pathogenic to humans. This study aimed to detect and quantify human adenoviruses (HAdV) in Acanthamoebas isolated from water samples collected from swimming pools in the city of Porto Alegre, Southern Brazil. Free-living amoebae of the genus Acanthamoeba were isolated from water samples, and isolates (n=16) were used to investigate the occurrence of HAdVs. HAdV detection was performed by quantitative real-time polymerase chain reaction (qPCR). HAdVs were detected in 62.5% (10/16) of Acanthamoeba isolates, ranging from 3.24x103 to 5.14x105 DNA copies per milliliter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acanthamoeba; Free-living amoebae; Human adenovirus; QPCR; Swimming pools.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200635

Modeling residual biomass from mechanized wood harvesting with data measured by forest harvester
Provedor de dados: 42
Autores: RODRIGUES,CARLA K.; LOPES,EDUARDO S.; FIGUEIREDO FILHO,AFONSO; PELISSARI,ALLAN L.; SILVA,MATHEUS K.C.
Abstract: The lack of accurate models for estimating residual biomass in wood harvesting operations results in underutilization of this co-product by forestry companies. Due to the lack of this information, forestry operations planning, such as chipping and transport logistics, are influenced, with a consequent increase in costs. Thereby, the aim of this study was to propose and evaluate statistical models to estimate residual biomass of Eucalyptus sp. in wood harvesting operations by means of tree variables measured from harvester processing head. Generalized linear models were composed through stepwise procedure for estimating residual biomass by tree covariates: diameter at breast height, commercial height, commercial limit diameter, and stem commercial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioenergy; Full-tree harvesting method; Forest measurement; Forest planning.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700867

Study of wet precipitation and its chemical composition in South of Brazil
Provedor de dados: 42
Autores: Teixeira,Elba C.; Migliavacca,Daniela; Pereira Filho,Sadi; Machado,Andréa C.M.; Dallarosa,Juliana B.
The purpose of this study is to analyze the chemical composition of wet precipitation in samples collected at three stations in the Candiota region in the Brazilian state of Rio Grande do Sul (RS). Samples were collected in 2004. Variables analyzed in wet precipitation were pH, conductivity, and concentration of Cl-, NO3-, SO4(2-) F-, Na+, Ca2+, Mg2+, K+, NH4+, Cu, Zn, Fe, Mn, Pb, Ni, Cd, Co, and Cr. SO2 and NO2 distribution over the time were also evaluated. Results have showed that pH &lt; 5.6 are found mostly at Candiota airport (85%), followed by Aceguá (72%) and Três Lagoas (65%). Enrichment Factor of the studied ions in wet deposition revealed higher Ca2+ and SO4(2-) enrichment in Três Lagoas. Factor Analysis applied to metals and major ions allowed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wet precipitation; Metals; Factor analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200016

The characterization and comparison of exopolysaccharides from two benthic diatoms with different biofilm formation abilities
Provedor de dados: 42
Autores: JIN,CUILI; YU,ZHAOWEI; PENG,SHUYA; FENG,KE; ZHANG,LIKUI; ZHOU,XIAOJIAN.
ABSTRACT Exopolysaccharide (EPS) of two benthic diatoms, Amphora sp. and Stauroneis sp., with different biofilm formation abilities were investigated. The ratio of suspension-cells/biofilm-cells was employed to indicate the diatom biofilm formation abilities. The soluble EPS from the supernatant of whole culture, tightly bound EPS from floating cells, loosely and tightly bound EPS from biofilm cells were fractionated as SL-EPS, F-TB-EPS, BF-LB-EPS and BF-TB-EPS, respectively. The analysis for productions and monosaccharide compositions indicated that EPS from two diatoms were different in terms of the productions, distributions, and monomer compositions. Amphora sp. produced more (1.5-fold) total exopolysaccharides, but less (&lt;0.4-fold) BF-TB-EPS than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic diatom; EPS; Biofilm formation ability; Monosaccharide composition; Glc-A.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401503

Public space, socio-environmental responsibility and citizenship: a case study on a Brazilian borough
Provedor de dados: 42
Autores: REIS,DANIELE P.; RABINOVICI,ANDRÉA; Neiman,Zysman; ROMERO,FERNANDA C.; FARIAS,LUCIANA A.
Abstract  Some researchers point out the decline in contemporary cities of the use of public spaces, whether free or restricted access. In this sense, the present essay proposes a reflection on a “public sphere of organized presence”, according to Habermas classification, as a rescue of the importance of this space for the exercise of citizenship and social-environmental responsibility. The reflection was based on the results obtained from a study in the district of Riacho Grande, São Bernardo do Campo, São Paulo, Brazil, in which the environmental perception of the participants of the meetings about the region was known by documentary analysis, direct observation and interviews with questionnaires. It was possible to verify that this public space can...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Citizenship; Public space; Sphere public.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101203

Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands of the tropical southwestern Atlantic
Provedor de dados: 42
Autores: SOUZA,CHRISTIANE S. DE; LUZ,JOANA A.G.; MAFALDA JUNIOR,PAULO O.
Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands off Northeastern Brazil were analyzed from 133 oceanographic stations during the months of January – April of 1997 and April – July of 1998. Oblique zooplankton tows, using 50 cm diameter Bongo nets with 500µm mesh with a flowmeter to determine the filtered volume, were carried out to a maximum of 200m depth. The Superficial Equatorial Water, which had a salinity &gt; 36 PSU and temperature &gt; 20°C, occupied the top 80 to 200m depth. Below this water mass was the South Atlantic Central Water with salinity ranging from 34.5 to 36 PSU and temperature from 6 to 20°C. The community of chaetognaths showed six species: Pterosagitta draco,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeastern Brazil; Seamounts; Spatial distribution; Variability; Zooplankton.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301151

Plant growth, radiation use efficiency and yield of sugarcane cultivated in agroforestry systems: An alternative for threatened ecosystems
Provedor de dados: 42
Autores: SCHWERZ,FELIPE; MEDEIROS,SANDRO L.P.; ELLI,ELVIS F.; ELOY,ELDER; SGARBOSSA,JAQUELINE; CARON,BRAULIO O.
Abstract Sugarcane (Sacharum officinarum L.) monocropping has had a great socio-economic and environmental impact in Brazil, and agroforestry systems have been considered as an alternative for more sustainable production; however, there is a lack of field research under such conditions. The aim of this study was to evaluate the growth rates, radiation use efficiency and yield traits in sugarcane cultivated in the understory of Aleurites fordii, in two agroforestry arrangements and monocropping systems. A field experiment was conducted from July 2015 to June 2016 in the city of Frederico Westphalen, Rio Grande do Sul, Brazil. The radiation use efficiency, assimilate partitioning, leaf area index, absolute growth rate, net assimilation rate, number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass partitioning; Crop systems; Growth rates; Sacharum officinarum; Yield traits.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703265

Nanoparticle-based therapy for respiratory diseases
Provedor de dados: 42
Autores: SILVA,ADRIANA L. DA; SANTOS,RAQUEL S.; XISTO,DÉBORA G.; ALONSO,SILVIA DEL V.; MORALES,MARCELO M.; ROCCO,PATRICIA R.M.
Nanotechnology is an emerging science with the potential to create new materials and strategies involving manipulation of matter at the nanometer scale (&lt;100 nm). With size-dependent properties, nanoparticles have introduced a new paradigm in pharmacotherapy – the possibility of cell-targeted drug delivery with minimal systemic side effects and toxicity. The present review provides a summary of published findings, especially regarding to nanoparticle formulations for lung diseases. The available data have shown some benefits with nanoparticle-based therapy in the development of the disease and lung remodeling in respiratory diseases. However, there is a wide gap between the concepts of nanomedicine and the published experimental data and clinical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asthma; Turberculosis; Nanotechnology; Lung cancer.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100137

Arylpropanoids from Neoregelia cruenta (R. Graham) L.B. Smith (Bromeliaceae)
Provedor de dados: 42
Autores: Yano,Mami; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200025

Amazon Forest maintenance as a source of environmental services
Provedor de dados: 42
Autores: Fearnside,Philip M.
Amazonian forest produces environmental services such as maintenance of biodiversity, water cycling and carbon stocks. These services have a much greater value to human society than do the timber, beef and other products that are obtained by destroying the forest. Yet institutional mechanisms are still lacking to transform the value of the standing forest into the foundation of an economy based on maintaining rather than destroying this ecosystem. Forest management for commodities such as timber and non-timber forest products faces severe limitations and inherent contradictions unless income is supplemented based on environmenta lservices. Amazon forest is threatened by deforestation, logging, forest fires and climate change. Measures to avoid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Avoided deforestation; Brazil; Carbon; Deforestation; Global warming; Greenhouse effect; Rainforest.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100006

Prevalence of Candida tropicalis and Candida krusei in onychomycosis in João Pessoa, Paraiba, Brazil from 1999 to 2010
Provedor de dados: 42
Autores: ARRUA,JULIANA M.M.; RODRIGUES,LUIS A.S.; PEREIRA,FILLIPE O.; LIMA,EDELTRUDES O.
ABSTRACTOver time, as the etiology of onychomycosis has developed, yeasts from the genus Candida have emerged as important etiological agents. This study aimed to determine the frequency of yeast caused onychomycosis in Joao Pessoa, Paraíba, Brazil from 1999 to 2010. A retrospective study from January 1999 to December 2010 evaluated the results of onychomycosis positive direct mycological exams (DME) - for yeast and realized in the Hemato(r) Clinical Laboratory. Women were the most affected by onychomycosis which occur preferentially in adults, and the toenails are the favorite yeast targets. The prevalent yeasts were Candida tropicalis and C. krusei.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida non-albicans; Epidemiology; Candidiasis; Nails.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401819

Wide-range genetic connectivity of Coney, Cephalopholis fulva (Epinephelidae), through oceanic islands and continental Brazilian coast
Provedor de dados: 42
Autores: Souza,Allyson S. de; Dias Júnior,Eurico A.; Galetti Jr,Pedro M.; Machado,Erik G.; Pichorim,Mauro; Molina,Wagner F.
The Epinephelidae form a group of species of high biological and economical interests. It´s phylogeographic patterns are not well known especially the distributed populations in the western region of the Atlantic Ocean. Among the representatives is a small species called Cephalopholis fulva, Coney, which presents a wide geographical distribution, polychromia, hermaphroditism and is quickly becoming a large target for the exploration of commercial fishing. The genetic and historical demography were obtained through the partial sequence analysis of Control Region from six locations on the coastline of Brazil from the northeast coast to the southwest coast, including the oceanic islands of Rocas Atoll and Fernando de Noronha Archipelago. The analyzed samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: D-loop; Glaciation; MtDNA; Panmixia; Phylogeography.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100121

A close look at above ground biomass of a large and heterogeneous Seasonally Dry Tropical Forest - Caatinga in North East of Brazil
Provedor de dados: 42
Autores: CASTANHO,ANDREA D.A.; COE,MICHAEL; ANDRADE,EUNICE M.; WALKER,WAYNE; BACCINI,ALESSANDRO; CAMPOS,DIEGO A.; FARINA,MARY.
Abstract  This work is focused on characterizing and understanding the aboveground biomass of Caatinga in a semiarid region in northeastern Brazil. The quantification of Caatinga biomass is limited by the small number of field plots, which are inadequate for addressing the biome’s extreme heterogeneity. Satellite-derived biomass products can address spatial and temporal changes but they have not been validated for seasonally dry tropical forests. Here we combine a compilation of published field phytosociological observations with a new 30m spatial resolution satellite biomass product. Both data were significantly correlated, satellite estimates consistently captured the wide variability of the biomass across the different physiognomies (2-272 Mg/ha). Based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Above ground biomass; Caatinga; Physiognomy; Remote sensing; Seasonally dry tropical forest; Semiarid.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100604

Trace metals and PAHs in topsoils of the University campus in the megacity of São Paulo, Brazil
Provedor de dados: 42
Autores: BOUROTTE,CHRISTINE L.M.; SUGAUARA,LUCY E.; MARCHI,MARY R.R. DE; SOUTO-OLIVEIRA,CARLOS E.
Abstract: The aim of this study is to discuss the concentration distribution, composition and possible sources of trace metals and 13 PAHs in topsoils of the University campus, in the city of São Paulo, the largest city of South America. Mineralogy and granulometry of topsoils (0-10 cm) samples, were determined and As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, V, Zn, Hg, Pt, Pd and PAHs concentrations were quantified in the bulk fraction. The average clay content of soils was 221±61.8 g kg-1 and total carbon was low (mean of 25 g kg-1). Concentrations of metals were generally lower than the reference value established by the São Paulo State Environmental Agency and other studies in the São Paulo urban area, except for Cd, Ni, Pb, Cr and Zn. The mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urban topsoils; Trace metals; PAHs; PMF.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500501

Formation of cortical tissue from slices maintained in vitro: a model for radial and tangential migration studies
Provedor de dados: 42
Autores: HEDIN-PEREIRA,CECILIA; MORAES,ELIZABETH C. P. DE; SANTIAGO,MARCELO F.; MENDEZ-OTERO,ROSALIA; LENT,ROBERTO.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300031

Unenlagiid theropods: are they members of the Dromaeosauridae (Theropoda, Maniraptora)?
Provedor de dados: 42
Autores: Agnolin,Federico L.; Novas,Fernando E.
In the present paper we analyze the phylogenetic position of the derived Gondwanan theropod clade Unenlagiidae. Although this group has been frequently considered as deeply nested within Deinonychosauria and Dromaeosauridae, most of the features supporting this interpretation are conflictive, at least. Modification of integrative databases, such as that recently published by Hu et al. (2009), produces significant changes in the topological distribution of taxa within Deinonychosauria, depicting unenlagiids outside this clade. Our analysis retrieves, in contrast, a monophyletic Avialae formed by Unenlagiidae plus Aves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gondwana; Deinonychosauria; Dromaeosauridae; Unenlagiidae; Avialae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100008

General results for the Marshall and Olkin's family of distributions
Provedor de dados: 42
Autores: BARRETO-SOUZA,WAGNER; LEMONTE,ARTUR J.; CORDEIRO,GAUSS M.
Abstract Marshall and Olkin (1997) introduced an interesting method of adding a parameter to a well-established distribution. However, they did not investigate general mathematical properties of their family of distributions. We provide for this family of distributions general expansions for the density function, explicit expressions for the moments and moments of the order statistics. Several especial models are investigated. We discuss estimation of the model parameters. An application to a real data set is presented for illustrative purposes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marshall-Olkin extended distribution; Maximum likelihood estimation; Monte Carlo simulation; Rényi entropy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100003

Resistance of the wild tomato Solanum habrochaites to Phytophthora infestans is governed by a major gene and polygenes
Provedor de dados: 42
Autores: COPATI,MARIANE G.F.; ALVES,FLÁVIA M.; DARIVA,FRANÇOISE D.; PESSOA,HERIKA P.; DIAS,FELIPE O.; CARNEIRO,PEDRO C.S.; CARNEIRO,DERLY J.H.; NICK,CARLOS.
Abstract: This work aimed to study the inheritance of resistance to Phytophthora infestans in tomato plants, using the maximum likelihood estimation function. The susceptible cultivar Santa Clara (Solanum lycopersicum) was used as the female genitor and the P. infestans resistant S. habrochaites f. glabratum accession (BGH 6902) as the male genitor. F1 plants from the crossing were self-pollinated to produce F2 progenies, and also backcrossed with PR and PS to produce BC1:R and BC1:S generations, respectively. The tomato plants were inoculated 50 days after transplanting. Disease severity was evaluated via a diagrammatic scale. Comparison of the genetic models created using the maximum likelihood function revealed that the inheritance of resistance to P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Phytophthora infestans; Genetic parameters; Studies of inheritance; Major gene; Polygenes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700854

Life cycle traits of Philodina roseola Ehrenberg, 1830 (Rotifera, Bdelloidea), a model organism for bioassays
Provedor de dados: 42
Autores: Moreira,Raquel A.; Mansano,Adrislaine S.; Rocha,Odete.
This paper describes experimental results on the life cycle of the rotifer Philodina roseola cultured in the laboratory. Detailed information on life-cycle parameters of a certain species provides a deep understanding and contributes to a better knowledge of the role of the species in the community, besides providing data that are basic to other ecological investigations such as secondary production estimates and knowledge for applications such as its utilization as test-organism in ecotoxicological studies. The average duration of embryonic development of P. roseola was 23.88 h, the age at maturity of primipara was 3.5 days and the maximum lifespan was 23 days. The average size of the rotifer neonate was 198.77 µm, the mean size of primipara was 395.56 µm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rotifer; Embryonary development; Growth; Fecundity; Longevity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200579

Behavioral response of Biomphalaria glabrataexposed to a sublethal concentration of Euphorbia miliivar. hislopii latex
Provedor de dados: 42
Autores: ALBERTO-SILVA,ANNA CARLA; CUNHA,RODOLFO A.; COSTA,VALDIR A. DA; SANTOS,EVERTON GUSTAVO N. DOS; VASCONCELLOS,MAURÍCIO C. DE; MELLO-SILVA,CLÉLIA CHRISTINA; SANTOS,CLÁUDIA P.
Abstract  The Euphobia milii var. hislopii latex has been tested in the control of schistosomiasis but its action in the locomotor activity of Biomphalaria glabrata is unknown. The objective of this work was to study the locomotor and reproductive behaviors of B. glabrata exposed to E. milii var. hislopii latex. For this, 96 snails were individually exposed to the latex (LC50 - 0.53 mg / L) for 24 hours. The specimens were submitted to biomonitoring for image analysis to record the locomotor parameters at different times: before exposure (control), one day post exposure (group 1 d-p-e) and 30 days post exposure (group 30 d-p-e). The reproductive parameters were recorded weekly for 10 weeks. All locomotor activities of group 1 d-p-e decreased significantly....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Biomonitoring; Biomphalaria glabrata; Control of schistosomiasis; Euphorbia milii var.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100716

Mammal tooth traces in a ferruginous cave in southeastern Brazil and their relevance to cave legal protection
Provedor de dados: 42
Autores: VASCONCELOS,ANDRÉ G.; BITTENCOURT,JONATHAS S.; AULER,AUGUSTO S.
Abstract: We ﻿describe the first occurrence of biogenic traces made by mammals within an iron formation cave located in the Serra da Ferrugem Ridge, in ﻿Southeastern Brazil. These bioerosions are tooth traces produced in boulders, walls and floor within the cave. The traces occur as sets of two or more grooves, which are highly variable in size. ﻿The grooves were compared to tooth traces artificially produced by imprinting the incisors of different mammal species collected in the cave region on soft clay. ﻿Among those, the following taxa are potential tracemakers: Akodon sp., Oligoryzomys sp., Necromys lasiurus, Rhipidomys mastacalis, Oecomys gr. concolor, Trinomys moojeni, and Hydrochoerus hydrochaeris. The age of the traces is unknown; therefore, any...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioerosion; Geophagy; Gnawing traces; Rodents; Ichnology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400511

Foreign market selection process as tool for international expansion: Case study for ecuadorian chia seeds exports to the european union
Provedor de dados: 42
Autores: TERÁN-YÉPEZ,EDUARDO; SANTOS-ROLDÁN,LUNA; PALACIOS-FLORENCIO,BEATRIZ; BERBEL-PINEDA,JUAN MANUEL.
Abstract  To assist Ecuadorian chia seed producers in their quest for internationalisation. This article uses a case study to present a methodology which assists in the selection of the most suitable export market for a product. It is based on a diverse range of indicators grouped into 7 dimensions that were used to analyse the 27 member countries of the European Union in order to determine the most suitable export market for chia seeds from Ecuador. Germany is the biggest European importer of chia seeds with a 55% share, followed by the Netherlands, the United Kingdom and Spain. It presents a methodology for market selection that can be employed as a tool for international expansion which can easily be used by companies in search of the most suitable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chia seeds; Ecuador; International market selection; Internationalisation; European Union.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101205

Approximate Entropy as a measure of complexity in sap flow temporal dynamics of two tropical tree species under water deficit
Provedor de dados: 42
Autores: Souza,Gustavo M.; Ribeiro,Rafael V.; Santos,Mauro G.; Ribeiro,Henrique L.; Oliveira,Ricardo F.
Approximate Entropy (ApEn), a model-independent statistics to quantify serial irregularities, was used to evaluate changes in sap flow temporal dynamics of two tropical species of trees subjected to water deficit. Water deficit induced a decrease in sap flow of G. ulmifolia, whereas C. legalis held stable their sap flow levels. Slight increases in time series complexity were observed in both species under drought condition. This study showed that ApEn could be used as a helpful tool to assess slight changes in temporal dynamics of physiological data, and to uncover some patterns of plant physiological responses to environmental stimuli.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Approximate Entropy; Complexity; Sap flow; Time series analysis; Tropical ecophysiology; Water deficit.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300015

Optimization of RT-PCR reactions in studies with genes of lignin biosynthetic route in Saccharum spontaneum
Provedor de dados: 42
Autores: LLERENA,JUAN P.P.; ARAÚJO,PEDRO; MAZZAFERA,PAULO.
ABSTRACT Saccharum spontaneum has been used for the development of energy cane a crop aimed to be used for the production of second-generation ethanol, or lignocellulosic ethanol. Lignin is a main challenge in the conversion of cell wall sugars into ethanol. In our studies to isolate the genes the lignin biosynthesis in S. spontaneum we have had great difficulty in RT-PCR reactions. Thus, we evaluated the effectiveness of different additives in the amplification of these genes. While COMT and CCoAOMT genes did not need any additives for other genes there was no amplification (HCT, F5H, 4CL and CCR) or the yield was very low (CAD and C4H). The application of supplementary cDNA was enough to overcome the non-specificity and low yield for C4H and C3H, while...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Cell wall; Energy cane; Lignin; Lignocellulosic ethanol; Sugarcane.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100509

Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon
Provedor de dados: 42
Autores: SILVA JÚNIOR,RENATO O. DA; SOUZA,EVERALDO B. DE; TAVARES,ALEXANDRA L.; MOTA,JOSÉ A.; FERREIRA,DOUGLAS B.S.; SOUZA-FILHO,PEDRO W.M.; ROCHA,EDSON J.P. DA.
ABSTRACT This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Hamon (HM), Kharrufa (KF) and Turc (TC) using monthly data from 1980 to 2013. In addition, it verifies the regional applicability to the IRW using a for the Marabá-PA station. The methods TC and PM (FAO56) presented the best results, which demonstrate that radiation and higher temperatures are the dominant drivers in the Evapotranspiration process, while relative humidity and wind speed have a much smaller impact. The temporal and spatial variability of ETo for IRW...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calibration; Decades; Eastern Amazon; Evapotranspiration; Methods; Watershed.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000501985

Diet influence on egg production of the copepod Acartia tonsa (Dana, 1896)
Provedor de dados: 42
Autores: Teixeira,Priscila F.; Kaminski,Sonia M.; Avila,Tatiana R.; Cardozo,Alessandro P.; Bersano,José G.F.; Bianchini,Adalto.
Egg production in the copepod Acartia tonsa was evaluated using different densities of the microalgae Thalassiosira weissflogii, Chaetoceros muelleri and Isochrysis galbana. Male and female were kept under controlled conditions (salinity 30, 20°C, photoperiod 12L:12D), acclimated to the experimental conditions and left over a period of 24 h to allow copulation. Algal densities tested were equivalent in biovolume and corresponded to 0, 2.5, 5, 10, 20, 40 and 60.10³ cells.mL-1 of T weissflogii. Ten acclimated female were separated, transferred to glass bottles and exposed for further 24 h to the corresponding experimental medium. After this period, the eggs were fixed and counted. Copepod egg production reached a threshold value when T weissflogii, C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Acartia tonsa; Microalgae.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200009

Autotransplant of spleen tissue in children with Schistosomiasis: evaluation of splenic function after Splenosis
Provedor de dados: 42
Autores: BRANDT,CARLOS T.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300028

Alluvial-eolian interaction in a Cambrian rift margin: the Pedra das Torrinhas and Pedra Pintada formations (Guaritas Group, RS)
Provedor de dados: 42
Autores: Marconato,André; Almeida,Renato P.; Santos,Maurício G. M.; Nóbrega,Jorge E.S.; Souza,Rogério B.
This work presents a study of selected outcrops from the Pedra das Torrinhas Formation of the Guaritas Group (Cambrian, Camaquã Basin), near the basin bordering Encantadas Fault Zone. The studied succession includes alluvial fan deposits that pass laterally into eolian deposits. Sedimentary facies and architectural element analysis were performed, followed by sedimentary petrography and microscopic porosity analysis, aiming to characterize the porosity of the deposits and its spatial distribution. The main objective was to contribute to a better understanding of the porosity spatial distribution in depositional systems characterized by the interaction between alluvial and eolian processes, with special reference to deposits formed prior to the development...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alluvial-eolian interaction; Pedra das Torrinhas Formation; Cambrian; Reservoir analogue models; Marginal rift facies.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400018

Morphological deformities in the osseous structure in spotted sorubim Pseudoplatystoma coruscans (agassiz &amp;amp; spix, 1829) with vitamin c deficiency
Provedor de dados: 42
Autores: FUJIMOTO,RODRIGO Y.; SANTOS,RUDÃ F.B.; CARNEIRO,DALTON J.
Vitamin C is essential for fish diets because many species cannot syntethize it. This vitamin is needed for bone and cartilage formation. Moreover, it acts as antioxidant and improve the immunological system. The present work investigated the effects of vitamin C diet supplementation to spotted sorubim (Pseudoplatystoma coruscans) fingerlings by frequency of bone and cartilage deformation. Ascorbyl poliphosphate (AP) was used as source of vitamin C in the diets for spotted sorubim fingerlings during three months. Six diets were formulated: one diet control (0 mg/kg of vitamin C) and 500, 1,000, 1,500, 2,000 and 2,500 mg AP/kg diets. Fishes fed without vitamin C supplementation presented bone deformation in head and jaws, and fin fragilities. Thus, 500 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scurvy; Bone formation; Siluriformes; Ascorbic acid.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100379

Sensitive and rapid titrimetric and spectrophotometric methods for the determination of stavudine in pharmaceuticals using bromate-bromide and three dyes
Provedor de dados: 42
Autores: Basavaiah,Kanakapura; Ramakrishna,Veeraiah; Somashekar,Chikkaswamy; Kumar,Urdigere R. Anil.
Four sensitive and rapid methods for the determination of stavudine (STV) in bulk drug and in dosage forms were developed and optimized. In titrimetry, aqueous solution of STV was treated with a known excess of bromate-bromide in HCl medium followed by estimation of unreacted bromine by iodometric back titration. Spectrophotometric methods involve the addition of a measured excess of bromate-bromide in HCl medium and subsequent estimation of the residual bromine by reacting with a fixed amount of methyl orange, indigocarmine or thymol blue followed by measurement of absorbance at 520 nm (method A), 610 nm (method B) or 550 nm (method C). In all the methods, the amount of bromate reacted corresponds to the amount of STV. Calculations in titrimetry were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stavudine determination; Titrimetry; Spectrophotometry; Bromate-bromide; Dyes; Pharmaceuticals.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200003

Electro-osmosis in kaolinite with pH-dependent surface charge modelling by homogenization
Provedor de dados: 42
Autores: Lima,Sidarta A.; Murad,Marcio A.; Moyne,Christian; Stemmelen,Didier.
A new three-scale model to describe the coupling between pH-dependent flows and transient ion transport, including adsorption phenomena in kaolinite clays, is proposed. The kaolinite is characterized by three separate nano/micro and macroscopic length scales. The pore (micro)-scale is characterized by micro-pores saturated by an aqueous solution containing four monovalent ions and charged solid particles surrounded by thin electrical double layers. The movement of the ions is governed by the Nernst-Planck equations, and the influence of the double layers upon the flow is dictated by the Helmholtz-Smoluchowski slip boundary condition on the tangential velocity. In addition, an adsorption interface condition for the Na+ transportis postulated to capture its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrical double layer; Electro-osmosis; Homogenization; Kaolinite; Nernst-Planck; Poisson-Boltzmann.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100016

Circulation and suspended sediment dynamics in a tropical estuary under different morphological setting
Provedor de dados: 42
Autores: PAIVA,BÁRBARA P.; SCHETTINI,CARLOS A.F.; PEREIRA,MARÇAL D.; SIEGLE,EDUARDO; MIRANDA,LUIZ B.; ANDUTTA,FERNANDO P.
ABSTRACT Estuarine processes are directly related to the interaction of its forcing conditions with the local morphology. In this study we assess the implications of the opening of a new inlet on the hydrodynamics and suspended sediment concentration (SSC). A set of physical parameters have been measured in the Itanhém river estuary, a small, shallow and mangrove fringed tropical estuary in Northeastern Brazil. Field surveys have been conducted in August 2007 and January 2008, separated by an important morphological change. Our observations show that even shortening the lower estuary channel in 2 km, the inlet opening did not imply in changes in the estuarine circulation. However, SSC increased after the inlet opening. General estuarine circulation showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuarine circulation; Sediment fluxes; Morphological changes; Tidal asymmetry.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401265

Early fragmentation of polyester urethane sheet neither causes persistent oxidative stress nor alters the outcome of normal tissue healing in rat skin
Provedor de dados: 42
Autores: SGROTT,SANDRO M.; NEVES,RODRIGO D.; D’ACAMPORA,ARMANDO J.; BERNARDES,GERALDO J.S.; BELMONTE,LUIZ; MARTINS,THIAGO C.; BOBINSKI,FRANCIANE; CARGNIN-FERREIRA,EDUARDO; HOEPERS,ANDREZA; COMIM,CLARISSA M.; MARTINS,DANIEL F.; PIOVEZAN,ANNA P.
Abstract Silicone breast implant is associated with complications inherent to the surgical procedure. Prosthesis coating with polyurethane, however, commonly reduces the incidence of such complications. In this paper, the authors evaluated the inflammatory histomorphometric profile and oxidative damage associated to the implant of polyester urethane sheets. Forty-eight Wistar rats were divided into Sham or polyester urethane groups (n = 8/group) and underwent a polyester urethane implant in the dorsal skinfold. Tissue samples were collected on days seven, 30, and 90 after surgery and subjected to histomorphometric analysis and biochemical tests. Results were analyzed by one-way ANOVA (p ≤ 0.05). Peri-implant tissue samples exhibited characteristic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Inflammation; Cytokines; Oxidative stress; Wistar rats.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502211

Esker-like features in the Itararé Subgroup (late Paleozoic), Northern Paraná Basin, Brazil
Provedor de dados: 42
Autores: ARAUJO,MARCOS R.; CANUTO,JOSÉ R.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300017

New approaches to the treatment of orphan genetic disorders: Mitigating molecular pathologies using chemicals
Provedor de dados: 42
Autores: VELHO,RENATA V.; SPERB-LUDWIG,FERNANDA; SCHWARTZ,IDA V.D.
With the advance and popularization of molecular techniques, the identification of genetic mutations that cause diseases has increased dramatically. Thus, the number of laboratories available to investigate a given disorder and the number of subsequent diagnosis have increased over time. Although it is necessary to identify mutations and provide diagnosis, it is also critical to develop specific therapeutic approaches based on this information. This review aims to highlight recent advances in mutation-targeted therapies with chemicals that mitigate mutational pathology at the molecular level, for disorders that, for the most part, have no effective treatment. Currently, there are several strategies being used to correct different types of mutations,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antisense oligonucleotide-mediated splicing redirection mutations; Exon skipping; Mismatch repair; Mutation-targeted therapies; Translational readthrough.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301375

Elastase-induced pulmonary emphysema: insights from experimental models
Provedor de dados: 42
Autores: Antunes,Mariana A.; Rocco,Patricia R.M.
Several distinct stimuli can be used to reproduce histological and functional features of human emphysema, a leading cause of disability and death. Since cigarette smoke is the main cause of emphysema in humans, experimental researches have attempted to reproduce this situation. However, this is an expensive and cumbersome method of emphysema induction, and simpler, more efficacious alternatives have been sought. Among these approaches, elastolytic enzymes have been widely used to reproduce some characteristics of human cigarette smoke-induced disease, such as: augmentation of airspaces, inflammatory cell influx into the lungs, and systemic inflammation. Nevertheless, the use of elastase-induced emphysema models is still controversial, since the disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chronic obstructive pulonary disease; Elastase; Ephysea; Experiental odel; Soke.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400025

From sand rich to mixed sand-mud ramp deep-water system: a conceptual model for the apiuna succession (Cambrian, Itajaí valley, Brazil)
Provedor de dados: 42
Autores: BASÍLICI,GIORGIO.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300022

Golden mussel Limnoperna fortunei (Bivalvia: Mytilidae) distribution in the main hydrographical basins of Uruguay: update and predictions
Provedor de dados: 42
Autores: Brugnoli,Ernesto; Clemente,Juan; Boccardi,Lucía; Borthagaray,Ana; Scarabino,Fabrizio.
Limnoperna fortunei, an Asiatic rivers bivalve has become a worldwide problematic invasive species causing several water quality and macrofouling problems. In the Neotropical region it was first recorded in 1991 in the Río de la Plata coast, Buenos Aires province. Since this, it showed a quick upstream invasion into the principals aquatic systems of the Plata Basin. Nevertheless, there is not a study about its invasion and distribution process in aquatic systems of Uruguay. We describe the new records of Limnoperna fortunei in Uruguayan coast of Río de la Plata, Santa Lucía, Negro and Uruguay Rivers. With these results we aim to estimate its distributional limits for Uruguay main hydrographical basins. We also deal with the role of salinity as the main...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasive mollusk; Biogeography; Salinity; Uruguay.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200004

Epicuticular waxes from caatinga and cerrado species and their efficiency against water loss
Provedor de dados: 42
Autores: Oliveira,Antonio F. M.; Meirelles,Sérgio T.; Salatino,Antonio.
The effects of the contents and chemical composition of the foliar epicuticular waxes of species from the caatinga (Aspidosperma pyrifolium, Capparis yco, Maytenus rigida and Ziziphus joazeiro) and cerrado (Aristolochia esperanzae, Didymopanax vinosum, Strychnos pseudoquina and Tocoyena formosa) were evaluated as to the resistance to water loss by means of an experimental device constructed for this purpose. In general, the waxes of the caatinga species investigated were more efficient against water loss than cerrado species. Increase of the thickness of the waxy deposits from 40 to 90m g.cm-2 had no significant effect on the resistance to water loss. The chemistry of the wax constituents was shown to be an important factor to determine the degree of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Cerrado; Epicuticular waxes; N-alkanes; Triterpenoids; Water diffusion.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400003

The pilocarpine model of epilepsy: what have we learned?
Provedor de dados: 42
Autores: Scorza,Fulvio A.; Arida,Ricardo M.; Naffah-Mazzacoratti,Maria da Graça; Scerni,Débora A.; Calderazzo,Lineu; Cavalheiro,Esper A.
The systemic administration of a potent muscarinic agonist pilocarpine in rats promotes sequential behavioral and electrographic changes that can be divided into 3 distinct periods: (a) an acute period that built up progressively into a limbic status epilepticus and that lasts 24 h, (b) a silent period with a progressive normalization of EEG and behavior which varies from 4 to 44 days, and (c) a chronic period with spontaneous recurrent seizures (SRSs). The main features of the SRSs observed during the long-term period resemble those of human complex partial seizures and recurs 2-3 times per week per animal. Therefore, the pilocarpine model of epilepsy is a valuable tool not only to study the pathogenesis of temporal lobe epilepsy in human condition, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hippocampus; Pilocarpine; Temporal lobe epilepsy; Rat.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300003

Heavy metals partitioning in the Rodrigo de Freitas lagoon; larvicidal potential of a new essential oil against Aedes aegypti; and the socioeconomic impact of tourism due to wild dolphins provisioning
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401215

Amyloid-β peptide absence in short term effects on kinase activity of energy metabolism in mice hippocampus and cerebral cortex
Provedor de dados: 42
Autores: IANISKI,FRANCINE R.; RECH,VIRGINIA C.; NISHIHIRA,VIVIAN S.K.; ALVES,CATIANE B.; BALDISSERA,MATHEUS D.; WILHELM,ETHEL A.; LUCHESE,CRISTIANE.
ABSTRACT Considering that Alzheimer's disease is a prevalent neurodegenerative disease worldwide, we investigated the activities of three key kinases: creatine kinase, pyruvate kinase and adenylate kinase in the hippocampus and cerebral cortex in Alzheimer's disease model. Male adult Swiss mice received amyloid-β or saline. One day after, mice were treated with blank nanocapsules (17 ml/kg) or meloxicam-loaded nanocapsules (5 mg/kg) or free meloxicam (5 mg/kg). Treatments were performed on alternating days, until the end of the experimental protocol. In the fourteenth day, kinases activities were performed. Amyloid-β did not change the kinases activity in the hippocampus and cerebral cortex of mice. However, free meloxicam decrease the creatine kinase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alzheimer's disease; Nanoparticles; Meloxicam; Energetic metabolism; Phosphoryltransfer network.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501829

Chemical, structural and optical characterisation of gemological tourmalines from pegmatites of the pegmatitic province of Borborema - batalha, capoeiras, quintos and bulandeira - in the districts of Rio Grande do Norte and Paraíba, NE of Brazil
Provedor de dados: 42
Autores: Barreto,Sandra B.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400029

Mercury in the sea turtle Chelonia mydas (Linnaeus, 1958) from Ceará coast, NE Brazil
Provedor de dados: 42
Autores: Bezerra,Moisés F.; Lacerda,Luiz D.; Costa,Breno G.B.; Lima,Eduardo H.S.M.
Mercury concentrations in carapace fragments of the green turtle Chelonia mydas from the Ceará coast in NE Brazil are reported. Concentrations varied from &lt;0.34 to 856.6 ng.g -1 d.w., and were highest (average of 154.8 ng.g -1 d.w.) in juveniles (n = 22), whereas lowest concentrations (average of 2.5 ng.g -1 d.w.) were observed in adult/sub-adult animals (n = 3). There was a significant negative correlation between animal size and Hg concentration probably due to different diets between juveniles and sub-adults/adults. Carapace fragments, which are non-invasive, non-lethal substrates, may be of importance for monitoring purposes of these generally endangered species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollution; Metals; Marine turtles; Monitoring.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100012

Allometric scaling and heterochrony in Mesosaurids (Amniota, Sauropsida) from the Irati Formation (Permian of the Paraná Basin, Brazil)
Provedor de dados: 42
Autores: CAVALCANTI,MAURO J.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200017

Impacts of hydroelectric dams on alluvial riparian plant communities in eastern Brazilian Amazonian
Provedor de dados: 42
Autores: FERREIRA,LEANDRO VALLE; CUNHA,DENISE A.; CHAVES,PRISCILLA P.; MATOS,DARLEY C.L.; PAROLIN,PIA.
The major rivers of the Amazon River basin and their biota are threatened by the planned construction of large hydroelectric dams that are expected to have strong impacts on floodplain plant communities. The present study presents forest inventories from three floodplain sites colonized by alluvial riparian vegetation in the Tapajós, Xingu and Tocantins River basins in eastern Amazonian. Results indicate that tree species of the highly specialized alluvial riparian vegetation are clearly distinct among the three river basins, although they are not very distinct from each other and environmental constraints are very similar. With only 6 of 74 species occurring in all three inventories, most tree and shrub species are restricted to only one of the rivers,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon River basin; Biodiversity loss; Floodplain forest; Hydroelectric dams.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301013

Analysis of labour risks in the Spanish industrial aerospace sector
Provedor de dados: 42
Autores: LAGUARDIA,JUAN; RUBIO,EMILIO; GARCIA,ANA; GARCIA-FONCILLAS,RAFAEL.
ABSTRACT Labour risk prevention is an activity integrated within Safety and Hygiene at Work in Spain. In 2003, the Electronic Declaration for Accidents at Work, Delt@ (DELTA) was introduced. The industrial aerospace sector is subject to various risks. Our objective is to analyse the Spanish Industrial Aerospace Sector (SIAS) using the ACSOM methodology to assess its labour risks and to prioritise preventive actions. The SIAS and the Services Subsector (SS) were created and the relevant accident rate data were obtained. The ACSOM method was applied through double contrast (deviation and translocation) of the SIAS or SS risk polygon with the considered pattern, accidents from all sectors (ACSOM G) or the SIAS. A list of risks was obtained, ordered by action...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ACSOM; Labour risks; Workplace prevention; Aerospace industrial sector.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602291

Morphological affinities of Homo naledi with other Plio-Pleistocene hominins: a phenetic approach
Provedor de dados: 42
Autores: NEVES,WALTER A.; BERNARDO,DANILO V.; PANTALEONI,IVAN.
ABSTRACT Recent fossil material found in Dinaledi Chamber, South Africa, was initially described as a new species of genus Homo, namely Homo naledi. The original study of this new material has pointed to a close proximity with Homo erectus. More recent investigations have, to some extent, confirmed this assignment. Here we present a phenetic analysis based on dentocranial metric variables through Principal Components Analysis and Cluster Analysis based on these fossils and other Plio-Pleistocene hominins. Our results concur that the Dinaledi fossil hominins pertain to genus Homo. However, in our case, their nearest neighbors are Homo habilis and Australopithecus sediba. We suggest that Homo naledi is in fact a South African version of Homo habilis, and not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cranio-dental traits; Human evolution; Human origins; Multivariate analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502199

Modeling the impact of net primary production dynamics on post-disturbance Amazon savannization
Provedor de dados: 42
Autores: SENNA,MÔNICA C.A.; COSTA,MARCOS H.; DAVIDSON,ERIC A.; NOBRE,CARLOS A.
Amazon tropical forests are being replaced by pasturelands and croplands, but they sometimes revert to regrowth forest when abandoned after a period of agricultural use. Research suggests that this secondary regrowth is limited by climate and nutrient availability and, using a coupled biosphere-atmosphere model, we investigated patterns in the regrowth of the Amazon rainforest after a full deforestation event, considering different types of nutrient stress. We found that, over a 50 year regrowth period, the reduction of precipitation caused by large-scale deforestation was not sufficient to prevent secondary forest regrowth, but this decrease in precipitation combined with nutrient limitation, due to logging and frequent fires, did indeed prevent forest...
Palavras-chave: Amazon; Climate; Deforestation; Ecosystem model; Net primary production; Savannization.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200621

Influence of the apparent molecular size of humic substances on the efficiency of coagulation using Fenton's reagent
Provedor de dados: 42
Autores: DE JULIO,MARCELO; DE JULIO,TATIANE S.; DI BERNARDO,LUIZ.
This work used Fenton's reagent as a coagulating agent in the treatment of water samples with high true colour caused by humic substances (HS) extracted from peat. In addition, the effects of the apparent molecular size of HS on coagulation, flocculation and flotation were studied. To that end, four distinct water samples having the same true colour were prepared using HS with different molecular sizes, which were obtained by ultrafiltration fractioning. Through optimisation of coagulant dosage and coagulation pH, as well as posterior construction of coagulation diagrams for each water sample, it was verified that the sample prepared with the smallest apparent molecular size of HS was the most difficult to treat, requiring higher coagulant (Fenton's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coagulation; DAF; Drinking water; Fenton's reagent; Humic substances; Molecular size.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200833

Aerobic exercise repairs neurological function after cerebral ischaemia by regulating the nitric oxide
Provedor de dados: 42
Autores: SUN,LEI; ZHUANG,LV-PING; WU,WEI-FENG.
Abstract: To investigate the mechanism of different exercise patterns on neurological function after focal cerebral ischaemia in rats. Rats with focal cerebral cerebral ischaemia were randomly divided into an aerobic exercise group, an exhaustive exercise group and a control group, with 8 rats in each group. A score for nerve function in each group was calculated, and the ultrastructure of nerve cells was observed. Levels of NO and NOS in the brain motor area of the ​​rats were measured in each group. The aerobic exercise group had lower nerve function scores than the exhaustive exercise group and higher scores than the control group (P&lt;0.05). Under transmission electron microscopy, irregular shapes and organs were observed in nerve cells in the control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise intensity; Cerebral ischaemia; Nervous function; Repair; NO; NOS.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500802

Taxonomic review and phylogenetic analysis of Enchodontoidei (Teleostei: Aulopiformes)
Provedor de dados: 42
Autores: Silva,Hilda M. A; Gallo,Valéria.
Enchodontoidei are extinct marine teleost fishes with a long temporal range and a wide geographic distribution. As there has been no comprehensive phylogenetic study of this taxon, we performed a parsimony analysis using a data matrix with 87 characters, 31 terminal taxa for ingroup, and three taxa for outgroup. The analysis produced 93 equally parsimonious trees (L = 437 steps; CI = 0. 24; RI = 0. 49). The topology of the majority rule consensus tree was: (Sardinioides + Hemisaurida + (Nardorex + (Atolvorator + (Protostomias + Yabrudichthys ) + (Apateopholis + (Serrilepis + (Halec + Phylactocephalus ) + (Cimolichthys + (Prionolepis + ( (Eurypholis + Saurorhamphus ) + (Enchodus + (Paleolycus + Parenchodus ))))))) + ( (Ichthyotringa + Apateodus ) +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aulopiformes; Enchodontoidei; Phylogeny; Taxonomy.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200010

Mercury and methylmercury in carapace of the marine turtle Caretta caretta, in northeastern Brazil and its potential for environmental monitoring
Provedor de dados: 42
Autores: RODRIGUEZ,CÉSAR AUGUSTO B.; BEZERRA,MOISES F.; REZENDE,CARLOS EDUARDO DE; BASTOS,WANDERLEY R.; LACERDA,LUIZ D. DE.
Abstract: The present work tests the use of carapace fragments of the marine turtle Caretta caretta as a tool for environmental biomonitoring of mercury (Hg) and to evaluate the influence of biological and ecological factors in Hg concentrations. Samples of carapace fragments were obtained during the nesting season of 2012 and 2016 and were analyzed for their total-Hg and methyl-Hg concentrations and the isotopic composition of carbon and nitrogen (δ15N and δ13C). Seventy-six females were sampled, with an average size of 87.1 to 107 cm of curved carapace length (CCL). The results showed a wide variation in total Hg concentrations (3.3 – 1,672 ng g-1) and low concentrations of methyl-Hg, not showing any pattern of accumulation among the individuals. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caretta caretta; Mercury; Carapace; Methylmercury; Stable isotopes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300402

Richness and abundance of the cardinigroup of Drosophila (Diptera, Drosophilidae) in theCaatinga and Atlantic Forest biomes in northeastern Brazil
Provedor de dados: 42
Autores: ROHDE,CLÁUDIA; SILVA,DIVA MARIA IZABEL O.; OLIVEIRA,GEÓRGIA F.; MONTEIRO,LIV S.; MONTES,MARTÍN A.; GARCIA,ANA CRISTINA L.
Brazil has a high diversity of flies of the genusDrosophila, and part of this richness is represented by thecardini group. We analyzed the fluctuations in the richness and abundance of this group, in environments that had never previously been studied in the northeastern region of Brazil. Among the 28,204 drosophilids sampled, 1,294 belonged to the cardini group and were represented by D. polymorpha, D. cardini, D. neocardini and D. cardinoides. Occurrences ofD. neocardini and D. cardinoides were registered for the first time in the Caatinga. In this biome,D. cardini stood out as having the highest abundance, andD. polymorpha was not observed. In the coastal Atlantic Forest, D. cardini was not registered, but D. polymorpha was found in all the localities...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Mangrove; Neotropical region; Pernambuco.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401711

Influence of tides and winds on fishing techniques and strategies in the Mamanguape River Estuary, Paraíba State, NE Brazil
Provedor de dados: 42
Autores: Bezerra,Dandara M.M.; Nascimento,Douglas M.; Ferreira,Emmanoela N.; Rocha,Pollyana D.; Mourão,José S.
This work was carried out in two small fishing communities, Barra de Mamanguape and Tramataia, Northeastern Brazil. The aim was to study these traditional fishermen's knowledge and perception about tide and wind classifications, as well as their fishing strategies and techniques. Our research methodology involved various techniques: free interviews and semi-structured ones, guided tours and direct observations. The results obtained show the fishermen's classification of the tides according to the phases of the moon: 'breaking tide', 'flushing tide', 'dead tide' and 'big tide' designated technically these last as neap tide and spring tide, respectively. Wind is also an essential factor for the fishermen to make successful catches, and they classify it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artisanal fishing; Ethnoictihology; Fish; Fishing communities; Lunar-tide cycle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300020

Special metabolites isolated from Urochloa humidicola (Poaceae)
Provedor de dados: 42
Autores: OLIVEIRA,DÉBORA R. DE; NEPOMUCENO,DELCI D.; CASTRO,ROSANE N.; BRAZ FILHO,RAIMUNDO; CARVALHO,MÁRIO G. DE.
ABSTRACT This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniques. The compounds 4-hydroxy-3-methoxy-benzoic acid, trans-4-hydroxycinnamic acid, and p-hydroxy-benzoic acid; the flavonols isorhamnetin-3-O-β-d-glucopyranoside and methyl quercetin-3-O-β-d-glucuronate; and kaempferitrin, quercetin-3-O-α-l-rhamnopyranoside, and tricin were identified in the extract from the leaves of Urochloa humidicola. Two furostanic saponins, namely, dioscin and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria humidicola; Flavonoids; Steroidal saponins; Urochloa.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300789

The peculiar breeding biology of the Amazonian frog Allobates subfolionidificans (Aromobatidae)
Provedor de dados: 42
Autores: SOUZA,JESUS R.D.; KAEFER,IGOR L.; LIMA,ALBERTINA P.
ABSTRACT Allobates subfolionidificans is a vulnerable and endemic leaf-litter frog from the state of Acre, Brazilian Amazonia. We monitored a population of A. subfolionidificans through regular censuses and mark-recapture of 181 individuals during an entire breeding season to characterize its reproductive behavior. The space use of A. subfolionidificans individuals differed between sexes, with males using smaller and more segregated spaces. Males defended territories and were aggressive against same-sex individuals, which was not the case in females. The daily cycle of calling activity showed peaks in the morning and in the afternoon, and the occurrence of reproductive events was positively correlated with monthly rainfall. The breeding behavior comprised...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anura; Dendrobatidae; Ethology; Leaf-litter frog; Space use.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300885

Stenodema longicuneata (Carvalho and Rosas, 1966) (Hemiptera, Heteroptera, Miridae) in Patagonia: redescription, new synonym and geographic distribution
Provedor de dados: 42
Autores: PEREYRA,PABLO M.; DIEZ,FERNANDO; COSCARÓN,MARÍA DEL CARMEN.
Abstract: The genus Stenodema Laporte, 1832 is a group of grass-feeding plant bugs worldwide distributed, with five species recorded for the Subantarctic sub-region (sunsuMorrone 2015). Males of Stenodema longicuneata (Carvalho and Rosas, 1966) are redescribed and photographed. Stenodema laolaoensis (Carvalho, 1985) is proposed as a junior synonym of S. longicuneata. New geographic records are provided and distributional and biogeographic issues are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina Chubut male redescription plant bugs Stenodema laolaoensis (Carvalho; 1985); Stenodemini.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700604

Cryopreservation of mutton snapper (Lutjanus analis) sperm
Provedor de dados: 42
Autores: SANCHES,EDUARDO G.; OLIVEIRA,IDILI R.; SERRALHEIRO,PEDRO C. DA SILVA; CERQUEIRA,VINICIUS R.
This study aimed to develop a protocol of semen cryopreservation of the mutton snapper Lutjanus analis. The interaction between three extenders ( pH 6.1; 7.8 and 8.2) , two concentrations of dimethyl sulfoxide ( DMSO, 5 and 10%) and three cooling rates ( -90; -60 and -30°C.min−1) on the sperm motility rate and motility time were analyzed by a factorial experiment. A sample of 30 fishes ( 1,261 ± 449 g) collected in the nature was kept in floating net cages. The semen was frozen by using cryogenic straws, in nitrogen vapour and transferred, later, to liquid nitrogen. Fertilization test was accomplished to evaluate the viability of the cryopreserved sperm. The highest sperm motility rate and motility time ( P &lt; 0.05) was achieved by combining extender C (...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryoprotector; Extender; Lutjanus analis; Reproduction; Sperm.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301083

Heavy metal behavior associated with soil cover used in the Bandeirantes Sanitary landfill, São Paulo District
Provedor de dados: 42
Autores: EZAKI,SIBELE; HYPOLITO,RAPHAEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300022

A new species of Microtetrameres (Nematoda, Tetrameridae) parasitizing Buteogallus urubitinga (Aves, Accipitridae) from northeastern Argentina
Provedor de dados: 42
Autores: DÍAZ,MARIANO Dueñas; DRAGO,FABIANA B.; NÚÑEZ,VERÓNICA.
Abstract A new tetramerid nematode, Microtetrameres urubitinga n. sp., is described from specimens recovered from the proventriculus of the great black-hawk, Buteogallus urubitinga (Aves: Accipitridae), from Formosa Province, Argentina. The males of the new species are characterized by having spicules unequal (length ratio of spicules 1:3.8–5.9) and dissimilar in shape (right spicule with a simple tip, left spicule with a symmetrical bifurcated tip), caudal papillae arranged asymmetrically (two pairs precloacal and two pairs postcloacal) and cloacal lips highly protruded forming a tube. The gravid females are permanently coiled clockwise or counterclockwise in a spiral and having a tail tapering gradually to a sharp point, with a cuticular fold. This is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accipitridae; Argentina; Buteogallus urubitinga; Microtetrameres urubitinga n. sp.; Tetrameridae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602967

Impact of natural climate change and historical land use on landscape development in the Atlantic Forest of Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: NEHREN,UDO; KIRCHNER,ANDRE; SATTLER,DIETMAR; TURETTA,ANA PAULA; HEINRICH,JURGEN.
Climate variations and historical land use had a major impact on landscape development in the Brazilian Atlantic Forest (Mata Atlântica). In southeast Brazil, rainforest expanded under warm-humid climate conditions in the late Holocene, but have been dramatically reduced in historical times. Nevertheless, the numerous remaining forest fragments are of outstanding biological richness. In our research in the Atlantic Forest of Rio de Janeiro we aim at the reconstruction of the late Quaternary landscape evolution and an assessment of human impact on landscapes and rainforests. In this context, special focus is given on (a) effects of climate variations on vegetation cover, soil development, and geomorphological processes, and (b) spatial and temporal land use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Historical land use; Landscape development; Natural climate change; Rio de Janeiro.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200497

Determining sexual dimorphism in frog measurement data: integration of statistical significance, measurement error, effect size and biological significance
Provedor de dados: 42
Autores: Hayek,Lee-Ann C.; Heyer,W. Ronald.
Several analytic techniques have been used to determine sexual dimorphism in vertebrate morphological measurement data with no emergent consensus on which technique is superior. A further confounding problem for frog data is the existence of considerable measurement error. To determine dimorphism, we examine a single hypothesis (Ho = equal means) for two groups (females and males). We demonstrate that frog measurement data meet assumptions for clearly defined statistical hypothesis testing with statistical linear models rather than those of exploratory multivariate techniques such as principal components, correlation or correspondence analysis. In order to distinguish biological from statistical significance of hypotheses, we propose a new protocol that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Statistics; Sexual dimorphism; Measurement error index; Effect size; Frogs.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100005

Influences of dietary crude protein and stocking density on growth performance and body measurements of ostrich chicks
Provedor de dados: 42
Autores: MAHROSE,KHALID M.; EL-HACK,MOHAMED E. ABD; AMER,SHYMAA A.
Abstract: Thirty-six African Black ostrich chicks were used to investigate the effects of dietary crude protein (CP) levels (180, 210 and 240 g/kg), stocking density (4.5 and 3 m2/bird) and their interactions. A factorial arrangement was used to examine the impact of treatments on growth performance and body measurements of ostrich chicks during 2 to 10 weeks of the age. Results indicated that factors studied did not change growth performance traits. The highest value of protein efficiency ratio was observed in ostrich chicks fed diet contained 240 g/kg diet. Birds fed diet contained 240 g CP /kg diet and kept at stocking density of 3 m2 per bird had numerically the highest protein efficiency ratio. Shank girth and tibiotarsus length decreased with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude Protein; Stocking density; Growth; Body measurements; Ostrich.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100630

Histology of juvenile skin of Lepidosiren paradoxa Fitzinger, 1837 (Sarcopterygii, Dipnoi)
Provedor de dados: 42
Autores: ROMANO,LUIS ALBERTO; LÓPEZ,ANDREA I.H.; BUITRAGO,JUAN RAFAEL; PEDROSA,VIRGÍNIA F.
Abstract: The skin of three juvenile Lepidosiren paradoxa specimens was examined. The epidermis was composed of a polystratified epithelium resting on a basement membrane, including mucus-secreting cells, and a cuticle of mucopolysaccharides on the surface. Two types of skin receptors, electroreceptors and mechanoreceptors, were found; the first type was located in the dermoepidermal junction, and the second type was completely intraepiderma. The skin structure of these fish, suggests the possibility of the skin participating in the breath.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electroreceptors; Lungfish; Mechanoreceptors; Paraná River basin; Pirambóia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700864

Wollastonite to hinder growth of Aspergillus niger fungus on cotton textile
Provedor de dados: 42
Autores: TAGHIYARI,HAMID R.; MAJIDINAJAFABADI,REZA; VAHIDZADEH,REZA.
Abstract Effects of Aspergillus niger was investigated on the strength of cotton textile specimens impregnated with nano-wollastonite, and then compared with normal specimens. Cotton strips were cut and prepared in warp and wept directions according to the standard specifications ASTM D-5035. Results showed that incubation of A. niger on specimens for three months resulted in a significant decrease in tensile stress as well as weight mass change in both directions. Impregnating specimens with NW ameliorated the negative effects of fungal attack on tensile stress to a considerable extent. Moreover, weight change was significantly decreased. It is concluded that NW positively protect cotton textile against A. nigra; the ultimate NW-content should be studied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological resistance; Cotton fabric; Fungal degradation; Mineral materials; Textile; Wollastonite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602797

Chemical Composition and Antibacterial Activity of the Essential Oil of Vitex agnus-castus L. (Lamiaceae)
Provedor de dados: 42
Autores: GONÇALVES,REGIANE; AYRES,VANESSA F.S.; CARVALHO,CARLOS E.; SOUZA,MARIA G.M.; GUIMARÃES,ANDERSON C.; CORRÊA,GEONE M.; MARTINS,CARLOS H.G.; TAKEARA,RENATA; SILVA,ELIANE O.; CROTTI,ANTÔNIO E.M.
ABSTRACT Abnormal multiplication of oral bacteria causes dental caries and dental plaque. These diseases continue to be major public health concerns worldwide, mainly in developing countries. In this study, the chemical composition and antimicrobial activity of the essential oil of Vitex agnus-castus leaves (VAC‒EO) collected in the North of Brazil against a representative panel of cariogenic bacteria were investigated. The antimicrobial activity of VAC-EO was evaluated in terms of its minimum inhibitory concentration (MIC) values by using the broth microdilution method in 96-well microplates. The chemical constituents of VAC-EO were identified by gas chromatography (GC‒FID) and gas chromatography‒mass spectrometry (GC‒MS). VAC‒EO displayed some activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptococcus mutans; 1-8-cineole; Cariogenic bacteria; Oral pathogens.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602825

Energy interconversion by the sarcoplasmic reticulum Ca2+-ATPase: ATP hydrolysis, Ca2+ transport, ATP synthesis and heat production
Provedor de dados: 42
Autores: MEIS,LEOPOLDO DE.
The sarcoplasmic reticulum of skeletal muscle retains a membrane bound Ca2+-ATPase which is able to interconvert different forms of energy. A part of the chemical energy released during ATP hydrolysis is converted into heat and in the bibliography it is assumed that the amount of heat produced during the hydrolysis of an ATP molecule is always the same, as if the energy released during ATP cleavage were divided in two non-interchangeable parts: one would be converted into heat, and the other used for Ca2+ transport. Data obtained in our laboratory during the past three years indicate that the amount of heat released during the hydrolysis of ATP may vary between 7 and 32 Kcal/mol depending on whether or not a transmembrane Ca2+ gradient is formed across the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ca2+-ATPase; Ca2+ transport; Energy interconversion; ATP hydrolysis; Heat production; Sarcoplasmic reticulum.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300010

Numerical Simulations to Assess ART and MART Performance for Ionospheric Tomography of Chapman Profiles
Provedor de dados: 42
Autores: PROL,FABRICIO S.; CAMARGO,PAULO O.; MUELLA,MARCIO T.A.H.
ABSTRACT The incomplete geometrical coverage of the Global Navigation Satellite System (GNSS) makes the ionospheric tomographic system an ill-conditioned problem for ionospheric imaging. In order to detect the principal limitations of the ill-conditioned tomographic solutions, numerical simulations of the ionosphere are under constant investigation. In this paper, we show an investigation of the accuracy of Algebraic Reconstruction Technique (ART) and Multiplicative ART (MART) for performing tomographic reconstruction of Chapman profiles using a simulated optimum scenario of GNSS signals tracked by ground-based receivers. Chapman functions were used to represent the ionospheric morphology and a set of analyses was conducted to assess ART and MART...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grid-based tomography; Electron density; Ionospheric profile; Chapman function; GNSS; TEC.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401531

Ouabain exacerbates activation-induced cell death in human peripheral blood lymphocytes
Provedor de dados: 42
Autores: Esteves,Mabel B.; Marques-Santos,Luis F.; Affonso-Mitidieri,Ottília R.; Rumjanek,Vivian M.
Lymphocytes activated by mitogenic lectins display changes in transmembrane potential, an elevation in the cytoplasmic Ca2+ concentrations, proliferation and/or activation induced cell death. Low concentrations of ouabain (an inhibitor of Na+,K+-ATPase) suppress mitogen-induced proliferation and increases cell death. To understand the mechanisms involved, a number of parameters were analyzed using fluorescent probes and flow cytometry. The addition of 100nM ouabain to cultures of peripheral blood lymphocytes activated with 5µg/ml phytohemagglutinin (PHA) did not modify the increased expression of the Fas receptor or its ligand FasL induced by the mitogen. However, treatment with ouabain potentiated apoptosis induced by an anti-Fas agonist antibody. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lymphocytes; Ouabain; PHA; Apoptosis; Membrane depolarization.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200008

Chemical and agronomic development of Kalanchoe brasiliensis Camb. and Kalanchoe pinnata (Lamk.) Pers under light and temperature levels
Provedor de dados: 42
Autores: Cruz,Bruna P.; Chedier,Luciana M.; Fabri,Rodrigo L.; Pimenta,Daniel S.
This study compares the development of Kalanchoe brasiliensis and Kalanchoe pinnata, which are medicinal species known as "saião" and "folha da fortuna" that are used interchangeably by the population for medicinal purposes. The experiment consisted of 20 plots/species planted in plastic bags with homogeneous substrate in a randomized design, which grown under light levels (25%, 50%, 70%, full sunlight) at environment temperature, and a treatment under a plastic with greater temperature range than the external environment. It was obtained for K. pinnata a greater plant height, total length of sprouts, stems, production and dry matter content of leaves than that obtained for K. brasiliensis, which achieved higher averages only for the length of lateral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kalanchoe; Luminosity; Mucilage; Flavonoids.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400030

Atomic force microscopy reveals different surface morphologies of functionally-different glial cells
Provedor de dados: 42
Autores: WEISSMÜLLER,GILBERTO; GARCIA-ABREU,JOSÉ; BISCH,PAULO MASCARELLO; MOURA NETO,VIVALDO; CAVALCANTE,LENY A.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300017

Pyroclastic breccias and related deposits of the Poços De Caldas Alkaline Complex, MG/SP, SE-Brazil
Provedor de dados: 42
Autores: ALVES,ARTUR D.; SCHORSCHER,HANS D.
Tipo: Info:eu-repo/semantics/article
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300016

A Novel Porous Diamond - Titanium Biomaterial: Structure, Microstructure, Physico-Mechanical Properties and Biocompatibility
Provedor de dados: 42
Autores: GUIMARÃES,ZULMIRA A.S.; DAMATTA,RENATO A.; GUIMARÃES,RENAN S.; FILGUEIRA,MARCELLO.
ABSTRACT With the aim of introducing permanent prostheses with main properties equivalent to cortical human bone, Ti-diamond composites were processed through powder metallurgy. Grade 1 titanium and mixtures of Ti powder with 2%, 5% and 10 wt% diamond were compacted at 100MPa, and then sintered at 1250°C/2hr/10-6mbar. Sintered samples were studied in the point of view of their microstructures, structures, yield strength and elastic modulus. The results showed that the best addition of diamonds was 2 wt%, which led to a uniform porosity, yield strength of 370MPa and elastic modulus of 13.9 GPa. Samples of Ti and Ti-2% diamond were subjected to in vitro cytotoxicity test, using cultures of VERO cells, and it resulted in a biocompatible and nontoxic composite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomaterials; Titanium; Diamond; Sintering; Characterization; Biocompatibility.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603111

On the pterosaur remains from the Río Belgrano formation (Barremian), Patagonian Andes of Argentina
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Aguirre-Urreta,María B.; Ramos,Victor A.
Pterosaur remains from the Río Belgrano Formation, Santa Cruz Province, Argentina, were found close to the Estancia Río Roble, along with several ammonoids that indicate a Barremian age for those strata. The specimens (MACN-SC 3617) consist of one ulna and one element tentatively identified as a portion of a wing metacarpal. The ulna shows morphological affinities with the Pteranodontoidea (sensu Kellner 1996), particularly with the members of the Anhangueridae by having a well developed ventral crest close to the proximal articulation, and is tentatively referred to this pterosaur clade. The oldest record of the Anhangueridae, previously limited to the Aptian/Albian, is therefore extended to the Barremian. The Argentinean material is preserved in three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Río Belgrano Formation; Lower Cretaceous; Argentina.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400007

Arsenic toxicity to cladocerans isolated and associated with iron: implications for aquatic environments
Provedor de dados: 42
Autores: SALES,SUELLEN C.M.; RIETZLER,ARNOLA C.; RIBEIRO,MARCELA M.
ABSTRACT Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L-1 (As III) and 0.54 mg L-1 (As V) for D. similis, and 0.44 mg L-1 (As III) and 0.69 mg L-1 (As V) for C. silvestrii. However, As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic ecotoxicology; Metals; Acute and chronic effects; D. similis; C. silvestrii.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200539

Assessing rainfall erosivity indices through synthetic precipitation series and artificial neural networks
Provedor de dados: 42
Autores: CECíLIO,ROBERTO A.; MOREIRA,MICHEL C.; PEZZOPANE,JOSé EDUARDO M.; PRUSKI,FERNANDO F.; FUKUNAGA,DANILO C.
The rainfall parameter that expresses the capacity to promote soil erosion is called rainfall erosivity (R), and is commonly represented by the indexes EI30 and KE&gt;25. The calculations of these indexes requires pluviographical records, that are difficult to obtain in Brazil. This paper describes the use of synthetic rainfall series to compute EI30 and KE&gt;25 in Espírito Santo State (Brazil). Artificial neural networks (ANNs) were also developed to spatially interpolate R values in Espírito Santo. EI30 and KE&gt;25 indexes values were close to those calculated on a homogeneous area according to the similarity of rainfall distribution; indicating the applicability of the use of synthetic rainfall series to estimate the R factor. ANNs had a better...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interpolation; Rainfall generator; Soil conservation; Universal soil loss equation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401523

Repercussions of low fructose-drinking water in male rats
Provedor de dados: 42
Autores: MIRANDA,CAROLINA A.; SCHÖNHOLZER,TATIELE E.; KLÖPPEL,EDUARDO; SINZATO,YURI K.; VOLPATO,GUSTAVO T.; DAMASCENO,DÉBORA C.; CAMPOS,KLEBER E.
Abstract Fructose consumption has increased worldwide, and it has been associated with the development of metabolic diseases such as insulin resistance (IR) and steatosis. The aim was to evaluate if lower fructose concentrations may cause pancreatic structural abnormalities, leading to a glucose intolerance without steatosis in male rats. Young male rats orally received 7% fructose solution for 12 weeks. Body weight, food, water, and energy intake were measured. An oral glucose tolerance test (OGTT) was performed. After final experimental period, all rats were anaesthetized and killed. Blood samples were collected for biochemical analyses and organs (liver and pancreas) were processed for morphological analyses. Fructose consumption was not associated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fructose; Glucose intolerance; Islet pancreatic; Steatosis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100702

Charcoal anatomy of Brazilian species. I. Anacardiaceae
Provedor de dados: 42
Autores: GONÇALVES,THAÍS A.P.; SCHEEL-YBERT,RITA.
ABSTRACT Anthracological studies are firmly advancing in the tropics during the last decades. The theoretical and methodological bases of the discipline are well established. Yet, there is a strong demand for comparative reference material, seeking for an improvement in the precision of taxonomic determination, both in palaeoecological and palaeoethnobotanical studies and to help preventing illegal charcoal production. This work presents descriptions of charcoal anatomy of eleven Anacardiaceae species from six genera native to Brazil (Anacardium occidentale, Anacardium parvifolium, Astronium graveolens, Astronium lecointei, Lithrea molleoides, Schinus terebenthifolius, Spondias mombin, Spondias purpurea, Spondias tuberosa, Tapirira guianensis, and Tapirira...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthracology; Archaeobotany; Charcoal; Palaeoecology; Environmental conservation; Wood anatomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501711

Computer program for distance learning of pesticide application technology
Provedor de dados: 42
Autores: Maia,Bruno; Cunha,Joao P.A.R.
Distance learning presents great potential for mitigating field problems on pesticide application technology. Thus, due to the lack of teaching material about pesticide spraying technology in the Portuguese language and the increasing availability of distance learning, this study developed and evaluated a computer program for distance learning about the theory of pesticide spraying technology using the tools of information technology. The modules comprising the course, named Pulverizar, were: (1) Basic concepts, (2) Factors that affect application, (3) Equipments, (4) Spraying nozzles, (5) Sprayer calibration, (6) Aerial application, (7) Chemigation, (8) Physical-chemical properties, (9) Formulations, (10) Adjuvants, (11) Water quality, and (12) Adequate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: E-learning; Pesticide application; Spraying; Teaching/learning strategies.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400028

High-frequency/low amplitude eustatic parasequences in Neoproterozoic Alto Paraguai basin (Mato Grosso, Brazil)
Provedor de dados: 42
Autores: NOGUEIRA,AFONSO C. R.; RICCOMINI,CLAUDIO.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300017

Effect of b-D-xylosides bearing different aglycones on the synthesis of proteoglycans during the cell cycle of endothelial cells in culture
Provedor de dados: 42
Autores: Moreira,C.R.; Lopes,C.C.; Porcionatto,M.A.; Esko,J.D.; Dietrich,C.P.; Nader,H.B.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100021

Potassium adsorption in soil cultivated with sugarcane
Provedor de dados: 42
Autores: FREITAS,JOYCYELY M.A.S.; NETTO,ANDRÉ M.; CORRÊA,MARCUS M.; XAVIER,BRUNO T.L.; ASSIS,FERNANDO X. DE.
ABSTRACT Vinasse is a byproduct of the process of distillation of sugarcane juice for the manufacture of sugar and alcohol. Because it is rich in nutrients, mainly potassium (K), is used as fertilizer and applied via fertigation, without concerning for the fate of this compound in the soil. Thus, the objective of the study was to evaluate the interactions of the potassium ion (K+), applied via vinasse in a soil representative of the sugarcane zone of the State of Pernambuco using adsorption isotherms. The methodology was based on physical, chemical and soil mineralogical characterization, as well as equilibrium batch tests, where the experimental curves were fitted by Langmuir and Freundlich isotherm models. The results allowed to infer that the Freundlich...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Vinasse; Langmuir and Freundlich isotherms; Sorption.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100541

Medicinal Plants: versatility and concordance of use in the caatinga area, Northeastern Brazil
Provedor de dados: 42
Autores: SANTOS,MARIA O.; RIBEIRO,DAIANY A.; MACÊDO,DELMACIA G. DE; MACÊDO,MÁRCIA J.F.; MACEDO,JULIMERY G.F.; LACERDA,MARIA NATÁLIA S. DE; MACÊDO,MARIA SORAYA; SOUZA,MARTA MARIA A.
Abstract This study aims to investigate the diversity of native medicinal plants in a caatinga area, verifying the versatility of species and concordance of use among the informants, in the Angico de Cima community, in the city of Aurora, Ceará, Brazil. Ethnobotanical data were obtained through semi-structured interviews with key informants, adopting the snowball technique. The Relative Importance (RI) and Consensus Factor among Informants (ICF) were analyzed to indicate the most versatile species with the highest agreement of use, respectively. Within the 35 registered native species, eight presented great versatility, with a RI&gt; 1, standing out Ziziphus joazeiro Mart. (1.86) and Heliotropium indicum (L.) Lehm (1.67). The 60 therapeutic indications...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consensus of factor; Ethnobotany; Popular knowledge; Relative importance; Therapeutic indications.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602767

Implementation of dental specialty centers: a descriptive analysis of the current status in the Brazilian territory
Provedor de dados: 42
Autores: ESTERY,LAURA; CERICATO,GRAZIELA O.; RIGO,LILIAN; RODE,SIGMAR M.; LIMA,IGOR F.P.; PARANHOS,LUIZ R.
ABSTRACT This study aimed to assess the current implementation status of Dental Specialty Centers (Centros de Especialidades Odontológicas - CEO) in Brazil. The sample included CEOs implemented up to November 2015 in the 27 Brazilian federative units. Data were obtained directly from the database of the Informatics Department of the Brazilian Unified Health System, according to the National Registry of Health Facilities (NRHF) of Dental Specialty Centers of all Brazilian regions. Primary care data were also collected from the cities with implemented CEOs, including coverage status of the Family Health Strategy (FHS) and number of Oral Health Teams (OHT) I and II, at 2 collection periods (January 2006 and November 2015). There were 1019 CEOs implemented in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Healthcare; Secondary healthcare; Oral health; Policies of dental specialty centers.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602843

Competitive antagonism associated with blockade of neuronal uptake: effects of indoramine in rat vas deferens and aorta
Provedor de dados: 42
Autores: Pupo,André S.; Cavenaghi,Daniela L.C.; Campo,Marcelo; Morais,Paola de Lucena; Jurkiewicz,Neide H.; Jurkiewicz,Aron.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100015

Gestational diabetes: a risk of puerperal hypovitaminosis A?
Provedor de dados: 42
Autores: RESENDE,FERNANDA B.S.; LIRA,LARISSA Q. DE; GRILO,EVELLYN C.; LIMA,MAYARA S.R.; DIMENSTEIN,ROBERTO.
The influence of gestational diabetes on vitamin A deficiency in lactating women and, consequently, in their newborn has been verified through a cross-sectional case-control study conducted with volunteer puerperal women. The control group consisted of healthy women and the test group was composed of women with gestational diabetes. One hundred and seven women were recruited, corresponding to 71 controls and 36 cases. Personal, gestational and newborn data were collected directly from medical records during hospitalization. The retinol was determined in maternal colostrum and serum by High Performance Liquid Chromatography. Postpartum women with gestational diabetes were older, had more children and a higher prevalence of cesarean delivery. No difference...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colostrum; Gestational diabetes; HPLC; Hypovitaminosis A; Postpartum.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100463

Late sodic metasomatism evidences in bimodal volcanic rocks of the Acampamento Velho Alloformation, Neoproterozoic III, southern Brazil
Provedor de dados: 42
Autores: Almeida,Delia Del Pilar M. de; Pereira,Vitor P.; Machado,Adriane; Zerfass,Henrique; Freitas,Ricardo.
A mineralogical study was carried out in mafic and felsic volcanic rocks of the Acampamento Velho Alloformation at Cerro do Bugio, Perau and Serra de Santa Bárbara areas (Camaquã Basin) in southern Brazil. The Acampamento Velho bimodal event consists of two associations: lower mafic at the base and upper felsic at the top. Plagioclase and alkali-feldspar were studied using an electronic microprobe, and magnetite, ilmenite, rutile, illite and alkali-feldspar were investigated through scanning electron microscopy. The rocks were affected by a process of late sodic autometasomatism. In mafic rocks, Ca-plagioclase was transformed to albite and pyroxenes were altered. In felsic rocks, sanidine was partially pseudomorphosed, generating heterogeneous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical mineral; Sodic metasomatism; Acampamento Velho Alloformation; Brazilian Orogeny.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400012

Erratum to ''Stereological tools in biomedical research'': an Acad Bras Cienc 75(2003): 469-486
Provedor de dados: 42
Autores: Mandarim-de-Lacerda,Carlos A.
Tipo: Info:eu-repo/semantics/report
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100007

First record of Utetheisa pulchella (Linnaeus, 1758) (Lepidoptera: Erebidae: Arctiinae) in Brazilian Amazon: implications for conservation
Provedor de dados: 42
Autores: TESTON,JOSÉ A.; CAMPELO,JANAÍNA DA C.; LOPES,ALESSANDRA M.C.; SPECHT,ALEXANDRE.
The crimson speckled moth, Utetheisa pulchella (Linnaeus, 1758), is recorded in Brazilian Amazon for the first time. A moth (male) was collected with light trap in a multiple cropping area, in Mojuí dos Campos municipality, Pará State, Brazil. This record expands the area of occurrence and distribution of this rare species in the Neotropical Region. In addition, the occurrence of U. pulchella in the Amazon was unexpected, since this species is generally associated with open ecosystems and drier climates.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geographic distribution; Noctuoidea; Arctiini; Callimorphina; Tiger-moths; Neotropics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100614

β-galactosidase Encapsulated in Carrageenan, Pectin and Carrageenan/Pectin: Comparative Study, Stability and Controlled Release
Provedor de dados: 42
Autores: SILVA,RENATA CRISTINA; TREVISAN,MARCELLO G.; GARCIA,JERUSA SIMONE.
Abstract  The present study investigated the encapsulation of β-galactosidase in carrageenan, pectin and its hybrid hydrogels by using the ionotropic gelation method. The material obtained was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG/DTG) and scanning electron microscopy (SEM). The effects of pH, temperature and storage time were evaluated in terms of the catalytic activity of the free and encapsulated enzyme. Addition studies were conducted evaluating the performance of catalytic activity in vitro conditions. Carrageenan, pectin and hybrid hydrogels presented encapsulation efficiency of 58 ± 1%, 72 ± 1% and 77 ± 2%, respectively. The pectin hydrogel showed the higher β-galactosidase activity in pH and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biopolymer; Encapsulation; Enzymatic activity; Ionotropic gelation; Lactase.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100905

Generation of a triple-fluorescent mouse strain allows a dynamic and spatial visualization of different liver phagocytes in vivo
Provedor de dados: 42
Autores: NAKAGAKI,BRENDA N.; FREITAS-LOPES,MARIA A.; CARVALHO,ÉRIKA; CARVALHO-GONTIJO,RAQUEL; CASTRO-OLIVEIRA,HORTÊNCIA M.; REZENDE,RAFAEL M.; CARA,DENISE C.; SANTOS,MÔNICA M.; LOPES,RODRIGO PESTANA; DAVID,BRUNA A.; MENEZES,GUSTAVO B.
ABSTRACT Resident and circulating immune cells have been extensively studied due to their almost ubiquitous role in cell biology. Despite their classification under the “immune cell department”, it is becoming increasingly clear that these cells are involved in many different non-immune related phenomena, including fetus development, vascular formation, memory, social behavior and many other phenotypes. There is a huge potential in combining high-throughput assays - including flow cytometry and gene analysis - with in vivo imaging. This can improve our knowledge in both basic and clinical cell biology, and accessing the expression of markers that are relevant in the context of both homeostasis and disease conditions might be instrumental. Here we describe...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intravital microscopy; Phagocytes; Liver immunology; Fluorescent markers; Hepatology; Gastroenterology; Immunology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200601

Photoelectrochemical solar cell using extract of Eugenia jambolana Lam as a natural sensitizer
Provedor de dados: 42
Autores: Garcia,Christian G.; Polo,André S.; Iha,Neyde Y. Murakami.
The extract of Jambolão (java plum), Eugenia jambolana Lam, was used as a natural sensitizer of a wide band-gap semiconductor (TiO2) in photoelectrochemical solar cells. The natural dye, adsorbed onto the semiconductor surface, absorbs visible light and promotes electron transfer across the dye/semiconductor interface. Photogenerated current and voltage as high as 2.3 mA and 711 mV, respectively, were obtained and effective conversion of visible light into electricity was achieved. The use of a natural product as the semiconductor sensitizer enables a faster and simpler production of cheaper and environmentally friendly solar cells.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photoelectrochemical solar cell; Natural dye; Jambolão (java plum); Energy conversion; Dye sensitized solar cells.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200004

Toxicity of neem's oil, a potential biocide against the invasive mussel Limnoperna fortunei (Dunker 1857)
Provedor de dados: 42
Autores: Pereyra,Patricio J.; Rossini,Gustavo B.; Darrigran,Gustavo.
The golden mussel Limnoperna fortunei (Dunker 1857) is one of the most distributed Nuisance Invasive Species (NIS) in South America, and a threat of great concern for the industry of the area. In this study, we carried out toxicity tests made with a Neem's oil solution with L. fortunei larvae and benthonic adults (7, 13 and 19 ± 1 mm). Tests with non-target species (Daphnia magna, Lactuca sativa and Cnesterodon decemmculatus) were also made with the aim to evaluate the potential toxicity of the Neem's solution in the environment. The LC100 of Neem's solution obtained for larvae was 500 µl/L, a value much higher than the one obtained for D. magna and C. decemmaculatus. Thus, we recommend that it should not be used in open waters. However, since the adults...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biocide; Impact; Limnoperna fortune; I Neem's oil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400020

Acute administration of fenproporex increased acetylcholinesterase activity in brain of young rats
Provedor de dados: 42
Autores: TEODORAK,BRENA P.; FERREIRA,GABRIELA K.; SCAINI,GISELLI; WESSLER,LETÍCIA B.; HEYLMANN,ALEXANDRA S.; DEROZA,PEDRO; VALVASSORI,SAMIRA S.; ZUGNO,ALEXANDRA I.; QUEVEDO,JOÃO; STRECK,EMILIO L.
Fenproporex is the second most commonly amphetamine-based anorectic consumed worldwide; this drug is rapidly converted into amphetamine, in vivo, and acts by increasing dopamine levels in the synaptic cleft. Considering that fenproporex effects on the central nervous system are still poorly known and that acetylcholinesterase is a regulatory enzyme which is involved in cholinergic synapses and may indirectly modulate the release of dopamine, the present study investigated the effects of acute administration of fenproporex on acetylcholinesterase activity in brain of young rats. Young male Wistar rats received a single injection of fenproporex (6.25, 12.5 or 25mg/kg i.p.) or vehicle (2% Tween 80). Two hours after the injection, the rats were killed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase; Amphetamine; Dopamine; Fenproporex.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301389

Areas of natural occurrence of Melipona scutellaris Latreille, 1811 (Hymenoptera: Apidae) in the state of Bahia, Brazil
Provedor de dados: 42
Autores: Alves,Rogério M.O.; Carvalho,Carlos A.L.; Souza,Bruno A.; Santos,Wyratan S.
The bee Melipona scutellaris is considered the reared meliponine species with the largest distribution in the North and Northeast regions of Brazil, with records from the state of Rio Grande do Norte down to the state of Bahia. Considering the importance of this species in the generation of income for family agriculture and in the preservation of areas with natural vegetation, this study aimed at providing knowledge on the distribution of natural colonies of M. scutellaris in the state of Bahia. Literature information, interviews with stinglessbee beekeepers, and expeditions were conducted to confirm the natural occurrence of the species. A total of 102 municipalities showed records for M. scutellaris, whose occurrence was observed in areas ranging from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stingless bee beekeeping; Uruçu bee; Stingless bees; Distribution.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300010

On focal stability in dimension two
Provedor de dados: 42
Autores: Peixoto,Mauricio M.; Pugh,Charles C.
In Kupka et al. 2006 appears the Focal Stability Conjecture: the focal decomposition of the generic Riemann structure on a manifold M is stable under perturbations of the Riemann structure. In this paper, we prove the conjecture when M has dimension two, and there are no conjugate points.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geodesics; Focal decomposition; Focal stability; Genericity; Teichmuller space.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100001

Ecological impacts of non-native tree species plantations are broad and heterogeneous: a review of Brazilian research
Provedor de dados: 42
Autores: VALDUGA,MARCOS O.; ZENNI,RAFAEL D.; VITULE,JEAN R.S.
RESUMO Plantações de árvores não nativas representam 7% das florestas do mundo e 1,24% da vegetação brasileira. Essas áreas plantadas devem aumentar no futuro próximo; assim, é importante sistematizar o conhecimento existente sobre os efeitos ecológicos das plantações para auxiliar o manejo florestal e a conservação da biodiversidade. Aqui, realizamos uma revisão sistemática da literatura ecológica associada com espécies plantadas de Pinus e de Eucalyptus no Brasil. Nós comparamos as métricas de publicação com: a distribuição geográfica das espécies, os tipos de ecossistemas, os biomas, os taxa, e os impactos ecológicos. Encontramos 152 publicações entre 1992 e 2012. O número de publicações está positivamente correlacionada com a área plantada, número de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservação da biodiversidade; Mudanças ambientais; Sistemas de certificação florestal; Manejo florestal; Plantas lenhosas não-nativas.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501675

Spatial variation in the stable isotopes of 13C and 15N and trophic position of Leporinus friderici (Characiformes, Anostomidae) in Corumbá Reservoir, Brazil
Provedor de dados: 42
Autores: Pereira,Alexandre L.; Benedito,Evanilde; Sakuragui,Cássia M.
Stable isotopes of carbon (delta13C) and nitrogen (delta15N) were used to describe sources of energy and trophic position for adult Leporinus friderici in the area of the Corumbá Reservoir, Brazil. Samples were collected from April 1999 to March 2000. Spatial variations were not identified in the isotopic composition. The maximum and minimum contribution of C4 plants calculated integrating the variation of plants and fish were 47.7% and 2.4%, respectively. Among C3 plants, periphyton presented closer isotopic values to those observed for fishes, corresponding to an important carbon source. The proportion of ingested plant item is larger in rivers upstream from the reservoir (42.7%), which justifies the smaller trophic level among there. However, in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stable isotopes; Reservoir; Leporinus friderici; Food web.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100006

Analysis of morpho-agronomic and climatic variables in successive agricultural years provides novel information regarding the phenological cycle of Jatropha in conditions of the Brazilian cerrado
Provedor de dados: 42
Autores: DOMICIANO,GISELE P.; ALVES,ALEXANDRE A.; LAVIOLA,BRUNO G.; ALBRECHT,JULIO C.
Phenological studies can provide information that enables the understanding of the dynamics of plants and how these dynamics are related to the biotic and abiotic environment. In order to study the phenological phases of Jatropha during two agricultural years, agronomic and climatic variables, such as temperature and rainfall, were evaluated. Data for each variable in each year and each genotype were subjected to analysis of variance (ANOVA) and the differences were tested at 5% probability by F test. In addition, the correlation of growth behavior and reproductive development of two Jatropha accessions (CNPAE-102 and CNPAE-169) as a function of time elapsed after the start of the phenological cycle with climatic variables were analyzed through Pearson's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Flowering; Growth; Yield.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401985

Micropropagation, antinociceptive and antioxidant activities of extracts of Verbena litoralis Kunth (Verbenaceae)
Provedor de dados: 42
Autores: Braga,Virgínia F.; Mendes,Giselle C.; Oliveira,Raphael T.R.; Soares,Carla Q.G.; Resende,Cristiano F.; Pinto,Leandro C.; Santana,Reinaldo de; Viccini,Lyderson F.; Raposo,Nádia R.B.; Peixoto,Paulo H.P.
This work describes an efficient micropropagation protocol for Verbena litoralis and the study of the antinociceptive and antioxidant activities in extracts of this species. For the establishment in vitro, surface-sterilization procedures and PVPP showed high efficiency in fungal-bacterial contamination and phenol oxidation controls. Nodal segments cultivation in MS medium supplemented with 6-benzyladenine (7.5 µM)/α-naphthaleneacetic acid (NAA; 0.005 µM) induced multiple shoots. Elongated shoots were rooted with IAA (0.2 µM). Acclimatization rates were elevated and the plants showed the typical features of this species. The hexanic fraction (HF) of powdered leaves presented a radical scavenging activity with IC50 = 169.3 µg mL-1. HF showed a non-dose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tissue culture; Biodiversity conservation; Biological effects; Natural products.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100014

Ultra-low temperature conservation of Brazilian Pine embryogenic cultures
Provedor de dados: 42
Autores: DEMARCHI,GRASIELA; STEFENON,VALDIR M.; STEINER,NEUSA; VIEIRA,FELIPE N.; VESCO,LIRIO L. DAL; GUERRA,MIGUEL P.
This study aimed to establish a cryopreservation protocol for embryogenic cultures of A. angustifolia, enabling the ex situ conservation of the species. Embryogenic cultures were established from immature seeds and treated with variations of the cryoprotectant solutions SuDG, SoD and PVS2 prior to immersion in liquid nitrogen. Cell viability was evaluated after 30, 60 and 90 days of re-growth. The highest re-growth without morphological alterations and with normal biochemical composition was obtained with the PVS2 solution with 40 min immersion in ethanol (-20 °C). This procedure opens new horizons for the ex situ conservation of the species genetic.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryopreservation; Ex situ conservation; In vitro culture; Plant germplasm conservation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402057

Description of a second known Liotyphlops caissara specimen (Serpentes: Anomalepididae)
Provedor de dados: 42
Autores: ABEGG,ARTHUR D.; AZEVEDO,WEVERTON S.; FRANCO,FRANCISCO L.; DUARTE,MARCELO R.
Abstract: We recorded a second specimen of the poorly known insular blind snake Liotyphlops caissara. This new specimen expands the morphological variation of the number of dorsal scales in the genus Liotyphlops to 296 (vs. 304 in L. wilderi) and, considering the fact that the holotype of this species was destroyed, the present specimen represents the only available L. caissara individual in zoological collections. Also, this new record constitutes the first out of type locality and expands the distribution of the species in about 40 km to the northeastern. According to IUCN criteria (B1a, b [iii]), we suggest that L. caissara be included in the “Endangered” category, since it occurs in only two insular locations and exhibits an occurrence extension of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic rainforest; Geographic distribution; Morphological variation; Southeastern Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500611

Longevity of the Brazilian underground tree Jacaranda decurrens Cham.
Provedor de dados: 42
Autores: ALVES,RUY J.V.; SILVA,NiLBER G. DA; FERNANDES JUNIOR,ALUiSIO J.; GUIMARAES,ALESSANDRA R.
Underground trees are a rare clonal growth form. In this survey we describe the branching pattern and estimate the age of the underground tree Jacaranda decurrens Cham. (Bignoniaceae), an endangered species from the Brazilian Cerrado, with a crown diameter of 22 meters. The mean age calculated for the individual was 3,801 years, making it one of the oldest known living Neotropical plants.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bignoniaceae; Cerrado; Campo rupestre; Longevity; Underground trees.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200671

Natural sesquiterpen lactones as acetylcholinesterase inhibitors
Provedor de dados: 42
Autores: HAJIMEHDIPOOR,HOMA; MOSADDEGH,MAHMOUD; NAGHIBI,FARZANEH; HAERI,ALI; HAMZELOO-MOGHADAM,MARYAM.
Background and the purpose of the study: The amount of elder people who suffer from Alzheimer disease is continuously increasing every year. Cholinesterase inhibitors have shown to be effective in alleviating the symptoms of the disease, thus opening a field of research for these treatments. Herbal products, owning a reputation as effective agents in many biological studies are now drawing attention for inhibiting acetylcholinesterase, in other words, Alzheimer disease. In the present study, the ability of three sesquiterpene lactones from Inula oculus-christi and I. aucheriana to inhibit AChE has been evaluated through Ellman assay.Materials and Methods: Gaillardin and pulchellin C were obtained from I. oculus-christi and britannin from I. aucheriana by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase inhibitor; Alzheimer; Britannin; Gaillardin; Inula; Pulchellin C.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200801

Physicochemical/photophysical characterization and angiogenic properties of Curcuma longa essential oil
Provedor de dados: 42
Autores: ARAÚJO,LILHIAN A.; ARAÚJO,RAFAEL G.M.; GOMES,FLÁVIA O.; LEMES,SUSY R.; ALMEIDA,LUCIANE M.; MAIA,LAURO J.Q.; GONÇALVES,PABLO J.; MRUÉ,FÁTIMA; SILVA-JUNIOR,NELSON J.; MELO-REIS,PAULO R. DE.
ABSTRACT This study analyzed the physicochemical and photophysical properties of essential oil of Curcuma longa and its angiogenic potential. The results showed that curcumin is the main fluorescent component present in the oil, although the amount is relatively small. The experimental chorioallantoic membrane model was used to evaluate angiogenic activity, showing a significant increase in the vascular network of Curcuma longa and positive control groups when compared to the neutral and inhibitor controls (P &lt;0.05), but no significant difference was found between Curcuma longa essential oil and the positive control (P &gt;0.05). Histological analysis showed extensive neovascularization, hyperemia and inflammation in the positive control group and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angiogenic activity; Curcumin; Essential oil; Physicochemical.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501889

Large-Scale Spatial and Temporal Variability of Larval Fish Assemblages in the Tropical Atlantic Ocean
Provedor de dados: 42
Autores: SOUZA,CHRISTIANE S. DE; MAFALDA JUNIOR,PAULO O.
Abstract This study investigated the large-scale spatial and temporal variability of larval fish assemblages in the west tropical Atlantic Ocean. The sampling was performed during four expeditions. Identification resulted in 100 taxa (64 families, 19 orders and 17 suborders). During the four periods, 80% of the total larvae taken represented eight characteristics families (Scombridae, Carangidae, Paralepididae, Bothidae, Gonostomatidae, Scaridae, Gobiidae and Myctophidae). Fish larvae showed a rather heterogeneous distribution with density at each station ranging from 0.5 to 2000 larvae per 100m3. A general trend was observed, lower densities at oceanic area and higher densities in the seamounts and islands. A gradient in temperature, salinity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic and biotic interactions; Abundance; Distribution; Ichthyoplankton.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100606

Characterization of α-actin isoforms in white and red skeletal muscle types of Leporinus macrocephalus (Characiformes, Anostomidae)
Provedor de dados: 42
Autores: ALVES-COSTA,FERNANDA A.; SILVA,MAELI D.P.; WASKO,ADRIANE P.
RESUMO Dois genes de α-actina do peixe Leporinus macroce­phalus, referindo-se aos tecidos musculares branco e vermelho, foram isolados. Isoformas de actinas, que principalmente diferiram por uma substituição Ser/Ala155, podem ter uma significância funcional relacionada à interação entre actina e ATP. Um resíduo de Ala155, como observado na α-actina esquelética do músculo vermelho, resulta em uma diminuição da afinidade da actina pelo ATP, o que também pode estar associado à ação contrátil lenta desse tecido. Adicionalmente, uma substituição Phe/Ile262 na actina do músculo vermelho leva a uma variação na hidrofobicidade no "plug-D" da proteína, o que pode alterar sua estabilidade. Dados de qRT-PCR evidenciaram significante maior nível de actina RNAm em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interação com ATP; Sítio de ligação; Substituição Ser/Ala155; Substituição Phe/Ile262.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502055

Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeographic Province that produce Trilete spores II: Microlepia speluncae and Pteridium arachnoideum
Provedor de dados: 42
Autores: Yañez,Agustina; Marquez,Gonzalo J.; Morbelli,Marta A.
The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are covered by a three-dimensional network of threads branched and fused, tangentially arranged to the surface, and some free-end threads are also seen. The species were differentiated by morphology and the frequency of threads fusion and the networks distribution on the surface of the spores. In both species the exospore is two-layered in section, both layers are traversed by single or branched channels. The perispore is three-layered in section: the inner layer is adhered to the exospore, the middle layer is formed of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spores; Ultrastructure; Dennstaedtiaceae; Paranaense Province; Microlepia speluncae; Pteridium arachnoideum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300877

Megaspores from coals of the Triunfo Member, Rio Bonito Formation (Lower Permian), northeastern Paraná State, Brazil
Provedor de dados: 42
Autores: RICARDI-BRANCO,FRESIA; ARAI,MITSURU; RÖSLER,OSCAR.
This paper presents the results of a detailed study of megaspores occurring in coal seams of the Triunfo Member, Rio Bonito Formation at Figueira, Paraná State, Brazil. This coal-bearing sequence accumulated in a marine delta system during the Early Permian. Four species are described and illustrated: Lagenoisporites triunfensis, L. scutiformis, Sublagenicula cf. brasiliensis, and Setosisporites cf. furcatus. Of these, the two species of Lagenoisporites are predominant. Relationships to other megaspore species are discussed; and the temporal and spatial distributions of the four species in the Paraná Basin are documented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Megaspores; Permian; Rio Bonito Formation; Paraná Basin.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300011

The identity of the mysterious “Azara’s Parakeet” Sittace flaviventris Wagler, 1832
Provedor de dados: 42
Autores: SMITH,PAUL.
ABSTRACT Sittace flaviventris Wagler, 1832 was the name given to Azara’s No. 276 “Maracaná cabeza y encuentro roxos”, but since then the identity of the species has remained a mystery. Based on a tail-less domestic individual, it has most often been attributed to an aberrant Aratinga parakeet, and is currently considered a doubtful taxon. In this note the identity of “Azara’s Parakeet” is confirmed as Red-spectacled Amazon Amazona pretrei (Temminck, 1830), a species that still occurs today in the region from where Azara described it. Sittace flaviventris is thus a junior synonym of Amazona pretrei.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazona pretrei; Félix de Azara; Psittacara leucophthalmus; Red-spectacled Amazon; Synonym.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602851

A new angiosperm from the Crato Formation (Araripe Basin, Brazil) and comments on the Early Cretaceous Monocotyledons
Provedor de dados: 42
Autores: LIMA,FLAVIANA J. DE; SARAIVA,ANTÔNIO A.F.; SILVA,MARIA A.P. DA; BANTIM,RENAN A.M.; SAYÃO,JULIANA M.
The Crato Formation paleoflora is one of the few equatorial floras of the Early Cretaceous. It is diverse, with many angiosperms, especially representatives of the clades magnoliids, monocotyledons and eudicots, which confirms the assumption that angiosperm diversity during the last part of the Early Cretaceous was reasonably high. The morphology of a new fossil monocot is studied and compared to all other Smilacaceae genus, especially in the venation. Cratosmilax jacksoni gen. et sp. nov. can be related to the Smilacaceae family, becoming the oldest record of the family so far. Cratosmilax jacksoni is a single mesophilic leaf with entire margins, ovate shape, with acute apex and base, four venation orders and main acrodromous veins. It is the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araripe Basin; Cratosmilax jacksoni; Cretaceous; Fossil leaf; Gondwana; Monocots.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401657

Morpho-physiological characteristics by sweet potato cultivars as function of irrigation depth
Provedor de dados: 42
Autores: DELAZARI,FÁBIO T.; ASSIS,IGOR R.; CABRERA,DIEGO F.V.; FERREIRA,MARIANE G.; DIAS,LUIZ E.; RUEDA,ANGELICA; ZANUNCIO,JOSÉ C.; SILVA,DERLY J.H.
Abstract The sweet potato is an alternative energy source, but its sustainability depends on efficient water use. The objective of this study was to evaluate sweet potato morpho-physiological characteristics, and water use efficiency (WUE). Irrigation depths of 50, 75, 100, and 125% of crop evapotranspiration (ETc) were applied. The morpho-physiological indicators, WUE, leaf area index (LAI), leaf water potential, leaf temperature, and leaf chlorophyll index (ICF), were evaluated. The WUE of the sweet potato cultivars increased until the 75% water depth of the ETc. The LAI of these cultivars increased with irrigation depth, with higher values at 100% of the ETc. The leaf water potential of the two sweet potato cultivars was lowest with the lower irrigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ipomoea batatas; Irrigation management; Leaf temperature; Water stress; Water use efficiency.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703541

Diversity and evolution of Amazonian birds: implications for conservation and biogeography
Provedor de dados: 42
Autores: RIBAS,CAMILA C.; ALEIXO,ALEXANDRE.
Abstract: Amazonia has been a focus of interest since the early days of biogeography as an intrinsically complex and extremely diverse region. This region comprises an intricate mosaic that includes diverse types of forest formations, flooded environments and open vegetation. Increased knowledge about the distribution of species in Amazonia has led to the recognition of complex biogeographic patterns. The confrontation of these biogeographic patterns with information on the geological and climatic history of the region has generated several hypotheses dedicated to explain the origin of the biological diversity. Genomic information, coupled with knowledge of Earth’s history, especially the evolution of the Amazonian landscape, presents fascinating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Biogeography; Birds; Conservation; Diversification; Rivers.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600611

Ultrastructure and pollen morphology of Bromeliaceae species from the Atlantic Rainforest in Southeastern Brazil
Provedor de dados: 42
Autores: Silva,Vanessa J.D.; Ribeiro,Ester M.; Luizi-Ponzo,Andrea P.; Faria,Ana Paula G.
Pollen grain morphology of Bromeliaceae species collected in areas of the Atlantic Rainforest of southeastern Brazil was studied. The following species were analyzed: Aechmea bambusoides L.B.Sm. &amp; Reitz, A. nudicaulis (L.) Griseb., A. ramosa Mart. ex Schult.f., Ananas bracteatus (Lindl.) Schult.f., Billbergia distachia (Vell.) Mez, B. euphemiae E. Morren, B. horrida Regel, B. zebrina (Herb.) Lindl., Portea petropolitana (Wawra) Mez, Pitcairnia flammea Lindl., Quesnelia indecora Mez, Tillandsia polystachia (L.) L., T. stricta Sol., T. gardneri Lindl., T. geminiflora Brongn. and Vriesea grandiflora Leme. Light and scanning electron microscopy were used and the species were grouped into three pollen types, organized according to aperture characteristics:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiphytes; Morphology; Pollen grains; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200439

ABA regulation of post-germination desiccation tolerance in wheat cultivars contrasting in drought tolerance
Provedor de dados: 42
Autores: KOUR,SATINDER; ZHAWAR,VIKRAMJIT K.
ABSTRACT Post-germination desiccation tolerance (DT) was studied in two wheat cultivars. Effect of pretreatment of abscisic acid (ABA)/ osmotic/ salt/ heat stress was also studied. One day (d)-old seedlings of wheat cultivars PBW 644 (drought tolerant) and PBW 343 (drought susceptible) were exposed to ABA/stress treatment for next 1 d, desiccated for 4 d and subsequently rehydrated for 4 d. Biomass, protein, water, protein carbonyls (oxidative toxicity) and nitric oxide (NO) levels were measured in 2 d (treated), 6 d (desiccated), 10 d (rehydrated) seedlings. Vegetative reactive oxygen species (ROS)/ NO-pathways were studied under normal condition and ABA supply by supplying ROS/NO scavengers. Desiccation caused water loss and increased oxidative toxicity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic; Abscisic acid; Nitric oxide; Post germination desiccation tolerance; Wheat.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401493

Community ecology of parasites in four species of Corydoras (Callichthyidae), ornamental fish endemic to the eastern Amazon (Brazil)
Provedor de dados: 42
Autores: FERREIRA,MAKSON M.; PASSADOR,RAFAEL J.; TAVARES-DIAS,MARCOS.
Abstract Abstract: This study compared the parasites community in Corydoras ephippifer, Corydoras melanistius, Corydoras amapaensis and Corydoras spilurus from tributaries from the Amapari River in State of Amapá (Brazil). A total of 151 fish of these four ornamental species were examined, of which 66.2% were parasitized by one or more species, and a total of 732 parasites were collected. Corydoras ephippifer (91.2%) and C. spilurus (98.8%) were the most parasitized hosts, while C. amapaensis (9.6%) was the least parasitized. A high similarity (≅ 75%) of parasite communities was found in the host species. Hosts were parasitized by Procamallanus (Spirocamallanus) inopinatus, Camallanus sp. and metacercariae of digeneans. The parasites had an aggregated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Diversity; Helminths; Parasites; Freshwater fish.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100608

The effects of forest-savanna-grassland gradients on bird communities of Chiquitano Dry Forests domain, in western Brazil
Provedor de dados: 42
Autores: GODOI,MAURICIO N.; SOUZA,EDIVALDO O. DE.
ABSTRACT Different vegetation types are distributed in mountains according to altitude, topography and soil. The composition and structure of bird communities in these areas can change in relation to the vegetation gradient, with particular communities occupying each habitat type. In this study we present the changes in composition, species richness and bird abundance over the gradient of forests, savannas and altitudinal grasslands of Maciço do Urucum, a mountainous region located in the Chiquitano Dry Forests domain in western Brazil. We recorded 165 bird species through qualitative and quantitative methods. Forested savannas, riparian forests and submontane forests presented the highest richness and abundance of birds, while arboreal savannas and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal grasslands; Avian communities; Chiquitano Dry Forests; Habitat diversity; Habitat use; Mountains.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501755

Comments on the Pteranodontidae (Pterosauria, Pterodactyloidea) with the description of two new species
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Considered one of the best known flying reptiles, Pteranodon has been subject to several reviews in the last century. Found exclusively in the Upper Cretaceous Niobrara Formation and Pierre Shale Group 11 species have been attributed to this genus (excluding the ones presently regarded as representing Nyctosaurus). While reviewers agree that this number is inflated, there is disagreement on how many species can be identified. The last review recognized only two species (Pteranodon longiceps and Pteranodon sternbergi) both being sexually dimorphic. Based on several cranial features, some specimens previously referred to the genus Pteranodon are re-evaluated leading to the recognition of the following species, two of which new that are described here:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterosauria; Pteranodon; Dawndraco; Late Cretaceous; Taxonomy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400025

Equilibrium pricing and ordering policies in a two-echelon supply chain in the presence of strategic customers
Provedor de dados: 42
Autores: SADJADI,SEYED J.; NAEIJ,JAFAR; SHAVANDI,HASAN; MAKUI,AHMAD.
ABSTRACT This paper studying the impact of strategic customer behavior on decentralized supply chain gains and decisions, which includes a supplier, and a monopoly firm as a retailer who sells a single product over a finite two periods of selling season. We consider three types of customers: myopic, strategic and low-value customers. The problem is formulated as a bi-level game where at the second level (e.g. horizontal game), the retailer determines his/her equilibrium pricing strategy in a non-cooperative simultaneous general game with strategic customers who choose equilibrium purchasing strategy to maximize their expected surplus. At the first level (e.g. vertical game), the supplier competes with the retailer as leader and follower in the Stackelberg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pricing and revenue management; Strategic customer; Supply chain management; Game theory.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301127

Study of barium sulfate dissolution by scale dissolver based on solutions of DTPA
Provedor de dados: 42
Autores: ABIB,GEIZILA A.P.; CRUZ,GEORGIANA F. DA; VAZ JUNIOR,ALEXANDRE S.L.
Abstract In offshore oil wells it is very common to perform seawater injection through injection wells for hydrocarbon recovery. When seawater, rich in sulfate ion, mixes with formation water, whose composition can contain divalent cations such as barium and calcium, it often leads to sulfate salts formation due to their chemical incompatibility. These salts can cause serious damage in production wells. The barium sulfate (BaSO4) is the most problematic scale and may cause many complications. In order to solve this issue, polycarboxylic acids, such as diethylene triamine pentaacetic acid, are used. Thus, the primary focus of this work was to develop an experimental procedure to study the BaSO4 dissolution. Initially, through static tests to understand the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral scale; Barite; Oil reservoir; Formation damage.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603185

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity
Provedor de dados: 42
Autores: MARTINS,SHIRLEY; SCATENA,VERA L.
The Cyperaceae species are present in different ecosystems and constitute the herbaceous extract. Of the approximately 5,500 species of the family; a third has Kranz anatomy, representing an important characteristic of the taxonomy and phylogeny of the group. In Cyperus laxus L. (non-Kranz) and Fimbristylis dichotoma Vahl (Kranz), development begins with germination that is marked by the emergence of the coleoptiles, followed by the primary root, which is ephemeral. The rhizome originates from the mesocotyl and it promotes the vascular connection between the roots, leaves and scapes. The continuity of the tissues is evidenced by the presence of an endodermis and pericycle in all vegetative organs. Leaves and scapes differ between the two species by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pericycle; Endodermis; Casparian strips; Seedling.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200605

Chemical constituents from Vellozia graminifolia (Velloziaceae)
Provedor de dados: 42
Autores: Branco,Alexsandro; Pinto,Angelo C.; Braz Filho,Raimundo.
From the hexane and ethyl acetate extracts obtained from stems, roots and leaf sheaths of Vellozia graminifolia, a mixture of linear hydrocarbons, a mixture of pentacyclic triterpenes, five monoisoprenylated flavonoids and one labdane diterpene, (-)-ent-3beta-hydroxy-8(17)-labden-15-oic acid, were isolated. The linear hydrocarbons and minor triterpenes were identified in their corresponding mixtures by High Resolution Gas Chromatography (HRGC) and HRGC coupled to mass spectrometry. The major pentacyclic triterpenes and the diterpene were characterized by spectral data, including 2D NMR experiments, and chemical transformations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vellozia graminifolia; Velloziaceae; Triterpenes; Diterpene; Flavonoids.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300005

Capsular Contracture In Silicone Breast Implants: Insights From Rat Models
Provedor de dados: 42
Autores: VIEIRA,VILBERTO J.; D'ACAMPORA,ARMANDO; NEVES,FERNANDA S.; MENDES,PAULO R.; VASCONCELLOS,ZULMAR A. DE; NEVES,RODRIGO D'EÇA; FIGUEIREDO,CLAUDIA P.
ABSTRACT Breast augmentation with silicone implants is one of the most common procedures performed by plastic surgeons around the world. Capsular contracture is a frequent complication in breast augmentation and reconstructive surgery, that requires invasive intervention. The inflammatory response to implanted mammary prostheses appears to be directly associated to capsular contracture. This review discusses the evidences from rat models studies, on the role of inflammation and fibrosis in capsular contraction and its relation to silicone breast implants surface.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsular contracture; Silicone breast implant; Breast augmentation; Smooth silicone implants; Textured silicone implants; Polyurethane-coated silicone implants.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401459

Complete ¹H and 13C NMR assignments and anti fungal activity of two 8-hydroxy flavonoids in mixture
Provedor de dados: 42
Autores: Johann,Susana; Smânia-Jr,Artur; Pizzolatti,Moacir G.; Schripsema,Jan; Braz-Filho,Raimundo; Branco,Alexsandro.
A mixture of the two new flavonols 8-hydroxy-3, 4', 5, 6, 7-pentamethoxyflavone (1) and 8-hydroxy-3, 3', 4', 5, 6, 7-hexamethoxyflavone (2) was isolated from a commercial sample of Citrus aurantifolia. An array of one- (¹HNMR, {¹H}-13C NMR, and APT-13C NMR) and two-dimensional NMR techniques (COSY, NOESY, HMQC and HMBC) was used to achieve the structural elucidation and the complete ¹H and 13C chemical shift assignments of these natural compounds. In addition, the antifungal activity of these compounds against phytopathogenic and human pathogenic fungi was investigated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polymethoxyflavones; Antifungal activity; Citrus aurantifolia.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200004

Abdominal macrochaetae of female Hylesia oratex Dyar, 1913 (Insecta: Lepidoptera: Saturniidae): external morphology and medical significance
Provedor de dados: 42
Autores: BRITO,ROSÂNGELA; SPECHT,ALEXANDRE; A. FILHO,WILSON S.; FRONZA,EDEGAR; MIELKE,CARLOS G.C.
The representatives of the genus Hylesia Hübner, [1820] are significant among the medically important Lepidoptera. Adult females use abdominal setae to wrap and protect the eggs that remain for months in nature. These setae, in contact with human skin, may cause allergic reactions including swelling, itching and local erythema, known as lepidopterism. The morphology of the abdominal scales and setae from the female H. oratex Dyar, 1913 is herein described and aspects related to their medical significance are discussed. Portions of each abdominal segment were examined through a scanning electron microscope. Two types of scales without medical importance, and two types of setae with medical importance, classified as "true setae" and "modified setae" were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allergic outbreaks; Lepidopterism; Morphology; Urticating moths.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401763

Screening of plant extracts and fractions on Aedes aegypti larvae found in the state of Mato Grosso do Sul (linnaeus, 1762) (culicidae)
Provedor de dados: 42
Autores: PORTO,KARLA R. DE ANDRADE; MOTTI,PRISCILLA R.; YANO,MAMI; ROEL,ANTONIA R.; CARDOSO,CLAUDIA A.L.; MATIAS,ROSEMARY.
ABSTRACT The constant use of chemical insecticides for Aedes aegypti control has caused resistance in the mosquito populations. Thus, the objective of this study was to analyze the larvicidal potential of extracts and fractions of plants on A. aegypti larvae. The analysis included sixty one extracts and twenty five fractions of fifty botanical species at concentrations of 0.25; 0.12; 0.06 to 0.03 mg mL-1; 4 replications and one negative control of dechlorinate water and 1% DMSO; and a positive control with rotenone. The toxicity index in descending order with LC50 for the most active of the extracts selected were ethanol extract of Ormosea arborea (0.111 mg mL-1) seeds and ethanol extracts of leaves such as Piper hispidum (0.169 mg mL-1), Solanum variabile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dengue fever; Insecticidal activity; Insecticide from plant; Larvicidal potential; Disease vector.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300895

Candida albicans Clinical Isolates from a Southwest Brazilian Tertiary Hospital Exhibit MFS-mediated Azole Resistance Profile
Provedor de dados: 42
Autores: PINTO,ANA CAROLINA C.; ROCHA,DEBORA A.S.; MORAES,DANIEL C. DE; JUNQUEIRA,MARIA L.; FERREIRA-PEREIRA,ANTONIO.
Abstract: ﻿Candida albicans is the most frequent fungal species that causes infections in humans. Fluconazole is the main antifungal used to treat Candida infections, and its prolonged and indiscriminate use for the last decades are the most established causes which originated resistant strains. Fungal drug resistance is associated to alterations in ERG11 gene and overexpression of multidrug resistance (MDR) transporters belonging to two families: ATP-binding cassette (ABC) and Major Facilitator Superfamily (MFS). To evaluate the role of MFS transporters in azoles resistance of C. albicans clinical strains, this study aimed to analyze four Candida albicans clinical isolates from the University Hospital in Juiz de Fora (Minas Gerais/Brazil), selected in our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida; Fluconazole; MFS; Multidrug resistance; Yeast.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500603

Electromagnetic fields at the sea bottom induced by a line of immersed electric dipoles
Provedor de dados: 42
Autores: Sampaio,Edson E.S.
The analysis of electromagnetic fields caused by alternate or transient electric currents flowing along a cable in sea water has several applications. It supports the interpretation of electromagnetic geophysical data and safety procedures against the threat of sea mines. The approach to the problem employs a magnetic vector potential in the frequency domain due to a pulse source electric dipole, and performs Laplace and Hankel transforms and integration along the cable, to describe the variation of the magnetic induction field due to an electric dipole of finite length. The result is applicable to shallow or deep sea water environments, adaptable to any transmitting current waveform and useful for wave-field separation. The prospects relate to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dipoles; Electromagnetic energy; Induced fields; Sea.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300007

BEEF TALLOW AND EMULSIFIER IN GROWING-FINISHING PIG DIETS
Provedor de dados: 42
Autores: SANTOS,KASSIA M.; WATANABE,PEDRO H.; FREITAS,EDNARDO R.; NEPOMUCENO,RAFAEL C.; OLIVEIRA,PAULA J.D.; LIMA,VIRGÍNIA M.; RODRIGUES,BÁRBARA B.V.; NASCIMENTO,GERMANO A.J. DO; CARVALHO,LUIZ E. DE.
ABSTRACT Two trials were aimed to evaluate beef tallow in diets with and without emulsifier on performance of pigs at growing-finishing phases. In the first trial, 15 barrows (22.03±0.62 kg) were distributed among three treatments: reference diet; test diet 1 (5% beef tallow) and test diet 2 (10% beef tallow). Beef tallow presented average value of 7130.97 kcal ME/kg. For the performance trail, 30 barrows (24.85±1.18 kg) were distributed among five treatments: T1 - diet with soybean oil and 3230 kcal ME /kg; T2 - diet with beef tallow and 3230 kcal ME/kg; T3 - diet with beef tallow and 3080 kcal ME/kg; T4 - diet with beef tallow, 3080 kcal/kg and 0.1% emulsifier; T5 - diet with beef tallow, 2930 kcal ME/kg and 0.1% emulsifier. Feed conversion was worse in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal fat; Lipids; Soy lecithin; Triglycerides.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301221

Short note on a Pteranodontoid pterosaur (Pterodactyloidea) from western Queensland, Australia
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Rodrigues,Taissa; Costa,Fabiana R.
Flying reptiles from Australia are very rare, represented mostly by isolated bones coming from the Early Cretaceous (Albian) Toolebuc Formation, which crops out in western Queensland. Among the first pterosaur specimens discovered from this deposit is a mandibular symphysis that some authors thought to have a particular affinity to species found in the Cambridge Greensand (Cenomanian) of England. It was further referred as a member of or closely related to one of the genera Ornithocheirus, Lonchodectes or Anhanguera. Here we redescribe this specimen, showing that it cannot be referred to the aforementioned genera, but represents a new species of Pteranodontoid (sensu Kellner 2003), here named Aussiedraco molnari gen. et sp. nov. It is the second named...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pteranodontoidea; Pterosauria; Toolebuc Formation; Cretaceous; Australia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100018

Hemoparasites of the genus Trypanosoma (Kinetoplastida: Trypanosomatidae) and hemogregarines in Anurans of the São Paulo and Mato Grosso do Sul States - Brazil
Provedor de dados: 42
Autores: Leal,Denise D.M.; O'dwyer,Lucia H.; Ribeiro,Vitor C.; Silva,Reinaldo J.; Ferreira,Vanda L.; Rodrigues,Rozangela B.
Wild animals are exposed to numerous pathogens, including hemoparasites. The Trypanosoma and hemogregarinegroup are frequently reported as parasites in anurans (frogs, tree frogs and toads). The identification of these hemoparasites is usually made through stage observation of their morphology in the peripheral blood of the host. There areno studies, however, based on the biological cycle of these hemoparasites. The objective of the present study was toevaluate the presence of hemogregarines and Trypanosoma spp. in anurans captured in the States of São Paulo andMato Grosso do Sul- Brazil and to perform the morphological and morphometric characterization of these hemoparasites. The species of anurans examined were: Dendropsophus nanus, D. minutus,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anuran; Hemogregarine; Trypanosoma; Hemoparasites.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200006

New approaches to the treatment of fear memories, the interaction of the plant Tropoaeolum majus and the meylerid Astylus variegatus, and a new flying reptile from the Cretaceous of China
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400001

Scattering of electromagnetic plane waves by a buried vertical dike
Provedor de dados: 42
Autores: Batista,Lurimar S.; Sampaio,Edson E. S.
The complete and exact solution of the scattering of a TE mode frequency domain electromagnetic plane wave by a vertical dike under a conductive overburden has been established. An integral representation composed of one-sided Fourier transforms describes the scattered electric field components in each one of the five media: air, overburden, dike, and the country rocks on both sides of the dike. The determination of the terms of the series that represents the spectral components of the Fourier integrals requires the numerical inversion of a sparse matrix, and the method of successive approaches. The zero-order term of the series representation for the spectral components of the overburden, for given values of the electrical and geometrical parameters of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scattering; Electromagnetic waves; Vertical dike.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200007

Phytochemical analysis and antioxidant capacity ofTabernaemontana catharinensis A. DC. Fruits and branches
Provedor de dados: 42
Autores: PIANA,MARIANA; BOLIGON,ALINE A.; BRUM,THIELE F. DE; ZADRA,MARINA; BELKE,BIANCA V.; FROEDER,AMANDA L.F.; FROHLICH,JANAÍNA K.; NUNES,LETÍCIA T.; PAPPIS,LAUREN; BOLIGON,ALEXANDRA A.; ATHAYDE,MARGARETH L.
The antioxidant capacity of the crude extract and fractions ofTabernaemontana catharinensis fruits and branches, was evaluated by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method and the content of polyphenols, flavonoids, alkaloids and condensed tannins were determined by the spectrophotometric method. The ethyl acetate fraction of the fruits and the n-butanol fraction of the branches showed IC50 of 181.82 µg/mL and 78.19 µg/mL, respectively. All fractions were analyzed by high performance liquid chromatography (HPLC), in the branches were quantified chlorogenic acid in the chloroform (8.96 mg/g), ethyl acetate (4.31 mg/g) and n-butanol (3.33 mg/g) fractions; caffeic acid in the ethyl acetate (5.24 mg/g) and n-butanol (1.81 mg/g); gallic acid (0.52 mg/g)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant capacity; Apocynaceae; Chlorogenic acid; Tabernaemontana catharinensis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200881

First record of the invasive tapeworm, Schyzocotyle acheilognathi (Pseudophyllidea; Bothriocephalidae) in native freshwater fish, Brazil
Provedor de dados: 42
Autores: SOUZA,GEOVANE A. DE; MORESCA,VICTOR O.; TEIXEIRA,GUSTAVO M.; JEREP,FERNANDO C.; AGUIAR,ALINE.
ABSTRACT Schyzocotyle acheilognathi is a tapeworm cestode commonly found in native freshwater fishes from Asia. This cestode has low host specificity and for that reason it has been registered parasitizing more than 200 cultured and wild fish species, besides amphibians, reptiles and birds from different regions of the world. With a high pathogenic potential, S. acheilognathi may cause mortalities in highly infected fish. In South America, Schyzocotyle was reported in Cyprinus carpio from a Brazilian fish farm at the municipality of Cornélio Procópio, northern Paraná State and from the natural environment in C. carpio from Neuquen River, Patagonia, Argentina. So far, there has been no report of this parasite in South American native fishes. Herein we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cestoda; Bothricephalus; Fish farm; Helminthes; Introduced species; Parasite invasion.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602845

U-Pb evidence for late Neoarchean crustal reworking in the Southern São Francisco Craton (Minas Gerais, Brazil)
Provedor de dados: 42
Autores: Campos,José C.S.; Carneiro,Maurício A.; Basei,Miguel A.S.
The Passa Tempo Metamorphic Complex is one of several metamorphic complexes that form the Archean sialic crust of the southern São Francisco Craton. It encompasses hypersthene-bearing gneissic rocks, with subordinateNW- or EW-trending mafic-ultramafic bodies and granodioritic to alkali-granitic, weakly foliated, and light-colored granitoids. These granitoids are the product of generalized migmatization that followed granulite-facies metamorphism. To determine the ages of the granulite-facies metamorphism and granitoid genesis, we obtained U-Pb ages on zircon extracted from the mesosome and leucosome of the migmatitic gneisses. For the mesosome, a discordia that intercepts Concordia at 2622 ± 18 Ma is interpreted as a minimum age for granulite-facies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Craton; Archean; Metamorphic complex; U-Pb geochronology; Tectonic evolution; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400008

Geochemical behavior of heavy metals in differents environments in Rodrigo de Freitas lagoon - RJ/Brazil
Provedor de dados: 42
Autores: Fonseca,Estefan M; Baptista Neto,José A; Fernandez,Marcos A; Mcalister,John; Smith,Bernard.
The accelerated urbanisation without a planning, brought several environmental problems to Rio de Janeiro coastal zone, especially in areas such as Rodrigo de Freitas lagoon, which receives a great amount of untreated sewage every day. To assess the nature, potentially sources and extent of heavy metal pollution in the lagoon, sediments from the surrounding streets, from the entrance of the main canal that drains to the lagoon and from the bottom of the lagoon were collected and analysed by a modified selective extraction procedure in order to study the geochemical partitioning and bioavailability of Zn, Cu, Cr, Ni and Pb in these three compartments. The present study verified an increase in the Cu, Pb and Zn concentrations in the north of the Rodrigo de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Rodrigo de Freitas lagoon; Sediments.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200008

Temporal changes in biological traits of diatom communities in response to an oil spill in a subtropical river
Provedor de dados: 42
Autores: FARIA,DENISE M. DE; COSTIN,JÚLIO C.; TREMARIN,PRISCILA I.; LUDWIG,THELMA A.V.
Abstract: Diatom growth strategies, which are used as a proxy to analyze disturbances and environmental impacts, can also provide reliable information about environmental gradients. In this study, we used diatom communities and biological traits to assess the structure of epilithic diatoms after an oil spill in a large tributary of the Iguaçu River (Paraná, Brazil). Epilithon and water samples were taken on July 12th, 2004, and after an unexpected oil spill, on the following days: 09/19, 10/03, and 10/13/2004. We observed that the spill caused a distinct shift in both diatom composition and guild group. Diversity decreased and pollution-tolerant diatoms of the motile group became dominant in response to the elevated nutrient levels and reduced light....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatom guilds; Disturbance; Diversity; Epilithon; Growth forms.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300609

Differences in the whistle characteristics and repertoire of Bottlenose and Spinner Dolphins
Provedor de dados: 42
Autores: Bazúa-Durán,Carmen.
Several methods have been used to compare the whistles produced by dolphins. The two methods used in this study are: (1) a classification of whistle contours in six categories (i.e. constant frequency, upsweep, downsweep, concave, convex, and sine) and (2) the extraction of frequency and time parameters from each whistle contour. Bottlenose Dolphin Tursiops truncatus whistles are described in the same way when comparing whistle contour distributions in each of the six categories and whistle frequency and time parameters using Discriminant Function Analysis. For Spinner Dolphin Stenella longirostris whistles, each method describes whistles differently. Several facts may explain these differences in describing dolphin whistles, such as a greater fluidity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Whistle characteristics; Classification methods; Whistle comparison; Geographic variations; Delphinidae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200030

A Special year for the AABC
Provedor de dados: 42
Autores: Kellner,Alexander W.A.; Meneghini,Rogerio.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100001

Growth ring analysis of fossil coniferous woods from early cretaceous of Araripe Basin (Brazil)
Provedor de dados: 42
Autores: Pires,Etiene F.; Guerra-Sommer,Margot.
Growth ring analysis on silicified coniferous woods from the Missão Velha Formation (Araripe Basin - Brazil) has yielded important information about periodicity of wood production during the Early Cretaceous in the equatorial belt. Despite warm temperatures, dendrological data indicate that the climate was characterized by cyclical alternation of dry and rainy periods influenced by cyclical precipitations, typical of tropical wet and dry or savanna climate. The abundance of false growth rings can be attributed to both occasional droughts and arthropod damage. The present climate data agree with palaeoclimatic models that inferred summer-wet biomes for the Late Jurassic/Early Cretaceous boundary in the southern equatorial belt.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araripe Basin - Brazil; Dendroclimatology; Pre-rift phase; Fossil woods.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200005

Diet and nematode infection in Proceratoprhys boiei (Anura: Cycloramphidae) from two Atlantic rainforest remnants in Southeastern Brazil
Provedor de dados: 42
Autores: Klaion,Thaís; Almeida-gomes,Mauricio; Tavares,Luiz E. R.; Rocha,Carlos F. D.; Sluys,Monique Van.
Proceratophrys boiei is an endemic cycloramphid anuran inhabiting the leaf litter of Atlantic rainforests in Southeastern Brazil. We analyzed the whole digestive tract of 38 individuals of Proceratophrys boiei collected in two Atlantic Rainforest areas in the state of Rio de Janeiro, Brazil, to study the diet composition and the helminth fauna associated with this species. The main food items in P. boiei's diet were Coleoptera, Orthoptera and Blattaria. Five nematode species were found: Aplectana delirae, Cosmocerca parva, Oxyascaris oxyascaris, Physaloptera sp. (larval stage only) and an unidentified nematode. Overall prevalence was 71% and mean infection intensity was 7.3 ± 5.8 neatodes per individual.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anura; Proceratoprhys; Diet; Endoparasitis; Neotropics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400017

Differential effects in CGRPergic, nitrergic, and VIPergic myenteric innervation in diabetic rats supplemented with 2% L-glutamine
Provedor de dados: 42
Autores: PEREIRA,RENATA V.F.; LINDEN,DAVID R.; MIRANDA-NETO,MARCÍLIO H.; ZANONI,JACQUELINE N.
ABSTRACT The objective of this study was to investigate the effects of 2% L-glutamine supplementation on myenteric innervation in the ileum of diabetic rats, grouped as follows: normoglycemic (N); normoglycemic supplemented with L-glutamine (NG); diabetic (D); and diabetic supplemented with L-glutamine (DG). The ileums were subjected to immunohistochemical techniques to localize neurons immunoreactive to HuC/D protein (HuC/D-IR) and neuronal nitric oxide synthase enzyme (nNOS-IR) and to analyze varicosities immunoreactive to vasoactive intestinal polypeptide (VIP-IR) and calcitonin gene-related peptide (CGRP-IR). L-Glutamine in the DG group (i) prevented the increase in the cell body area of nNOS-IR neurons, (ii) prevented the increase in the area of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabetic neuropathy; Glutamine; Ileum; Myenteric innervation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200609

Relationship between periodontal outcomes and serum biomarkers changes after non-surgical periodontal therapy
Provedor de dados: 42
Autores: LOBÃO,WALDER J.M.; CARVALHO,ROSANA C.C. DE; LEITE,SANDRA A.M.; RODRIGUES,VANDILSON P.; BATISTA,JOSÉ EDUARDO; GOMES-FILHO,ISAAC S.; PEREIRA,ANTONIO L.A.
Abstract: The systemic effect of chronic periodontitis (CP) has been suggested by several studies as an etiologic factor and modulator of diseases based on the changes in the inflammatory marker levels. This study aimed to investigate the relationship between the changes in clinical periodontal outcomes and serum biomarkers (CRP, IL-6, albumin and percentage of leukocytes) after non-surgical periodontal therapy in systemically healthy adults. An interventional study was conducted with a sample of 29 individuals without CP (control group) and 33 with CP (CP group). Periodontal clinical variables were recorded, and the serum levels of inflammatory markers were measured. Statistical analysis included the chi-square and Student’s t-tests and Pearson’s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chronic periodontitis; Inflammation mediators; Interleukin-6; C-reactive protein; Leukocytes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300805

The promoting effect of cesium on structure and morphology of silver catalysts
Provedor de dados: 42
Autores: Carvalho,Marta C. N. A.; Perez,Carlos A.; Simão,Renata A.; Passos,Fabio B.; Schmal,Martin.
Silver supported catalysts on alpha-alumina were prepared and characterized by Brunauer-Emmet-Teller equations, scanning electronic microscopy, X-ray diffraction and atomic force microscopy techniques. Results show that these are powerful techniques for the determination of texture, morphology and surface properties. It has been shown that the addition of Cs in the Ag/Al2O3 catalyst increased the dispersion of silver with the formation of small silver particles over a thin silver film already formed over the alumina support. It is important to stress that atomic force microscopy measurements are significant to observe the film and the dispersion of Ag and, on the contrary, X-ray photoelectronic spectroscopy did not, however, it allows to the conclusion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver; Cesium; Catalyst; AFM; XPS.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100003

Wind pollination and propagule formation inRhizophora mangle L. (Rhizophoraceae): resource or pollination limitation?
Provedor de dados: 42
Autores: NADIA,TARCILA L.; MACHADO,ISABEL C.
Rhizophora mangle is considered as a self-compatible mangrove, and is pollinated by wind and insects. However, there is no information about fruit production by autogamy and agamospermy and on the foraging behavior of its flower visitors. Hence, the present study analyzed the pollination and reproductive systems of R. mangle in a mangrove community in northern Pernambuco, Brazil. Floral morphology, sequence of anthesis, and behavior of flower visitors were described; the proportion of flowers that resulted in mature propagules was also recorded. Autogamy, agamospermy, and wind pollination tests were performed, and a new anemophily index is proposed. The flowers of R. mangle are hermaphrodite, protandric, and have high P/O rate. Flies were observed on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anemophily index; Autogamy; Entomophily; Mangrove; Red mangrove.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100229

Different slopes of a mountain can determine the structure of ferns and lycophytes communities in a tropical forest of Brazil
Provedor de dados: 42
Autores: NETTESHEIM,FELIPE C.; DAMASCENO,ELAINE R.; SYLVESTRE,LANA S.
A community of Ferns and Lycophytes was investigated by comparing the occurrence of species on different slopes of a paleoisland in Southeastern Brazil. Our goal was to evaluate the hypothesis that slopes with different geographic orientations determine a differentiation of Atlantic Forest ferns and lycophytes community. We recorded these plants at slopes turned towards the continent and at slopes turned towards the open sea. Analysis consisted of a preliminary assessment on fern beta diversity, a Non Metric Multidimensional Scaling (NMDS) and a Student t-test to confirm if sites sampling units ordination was different at each axis. We further used the Pearson coefficient to relate fern species to the differentiation pattern and again Student's t-test to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic rain forest; Topography; Pteridophytes; Richness; Environmental factors.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100199

Cytogenotoxicity of rice crop water after application of the tricyclazole fungicide
Provedor de dados: 42
Autores: WANDSCHEER,ALANA C.D.; MARCHESAN,ENIO; TEDESCO,SOLANGE B.; FRESCURA,VIVIANE DAL-SOUTO; SOARES,CAMILLE F.; LONDERO,GUILHERME P.; TELÓ,GUSTAVO M.; HANSEL,DÂMARIS S.S.
ABSTRACT Tricyclazole is currently one of the fungicides recommended for the treatment of diseases in irrigated rice. However, there is relatively little information on its cytotoxic and genotoxic potential. The objective of this study was to evaluate the cytotoxicity and genotoxicity of rice crop water after apllication of the tricyclazole fungicide through the Allium cepa L. test. The rice crop water samplings were collected before and 1, 15 and 30 days after application of the fungicide in rice plant shoots. The Allium cepa roots were placed in contact with the rice crop water to check for possible chromosomal abnormalities and mitotic index of the bioindicators meristematic cells. The data obtained by the Allium cepa test indicates that the application...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindicator; Chromosomal abnormalities; Mitotic index; Pesticide; Irrigated rice.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301251

Are communication activities shaped by environmental constraints in reverberating and absorbing forest habitats?
Provedor de dados: 42
Autores: Manthevon,Nicolas; Aubin,Thierry; Dabelsteen,Torben; Vielliar,Jacques M.E.
In the dense vegetation of temperate or tropical forests, communication processes are constrained by propagation-induced modifications of the transmitted sounds. The presence of leaves, trunks and branches induces important sound reverberation and absorption leading to diminution of the signal energy as well as qualitative modifications. The aim of this paper is to briefly review the different strategies used by birds to manage with these constraints. At the emitter's level, an adapted emission behavior which takes into account both the physical heterogeneities of the forest environment and the temporal variations of the acoustic constraints, is especially useful to control the active space of signaling. The coding of information into acoustic parameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic communication; Propagation-induced modifications; Environmental constraints; Evolution of communication.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200011

Some topics on geochemistry of weathering: a review
Provedor de dados: 42
Autores: Formoso,Milton L.L.
Weathering is a complex process comprising physical disaggregation, chemical and biological decomposition of rocks and minerals transforming complex structure minerals in simpler ones. Hydrolysis of silicates is perhaps the most important process but associated certainly to biological weathering. It is discussed the role ofwaters: activities/concentrations of chemical species, pH, Eh, importance of complexes. Weathering is not only a destructive process. It can concentrate chemical species and form mineral deposits (kaolin, bauxite, Fe, Mn, P, Nb, Au). Weathering studies are important in pedology, engineering geology, hydrogeology, paleoclimatology and ecology. The use of stonemeal is based upon the study of rock weathering.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical weathering; Hydrolysis of silicates; Biological weathering; Physicochemical parameters of weathering.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400014

Sloths of the Atlantic Forest in the sixteenth and seventeenth centuries
Provedor de dados: 42
Autores: MOREIRA,DANIELLE O.; MENDES,SÉRGIO L.
ABSTRACT Sloths were a curiosity item for Europeans in the 16th and 17th centuries, and several descriptions of them exist in bestiaries and texts of that time. Here, we assemble the descriptions and drawings of sloths from the travellers and naturalists of those centuries in the Brazilian Atlantic Forest. The sloth was a novelty to the European audience, and it was described in many strange and inaccurate ways: as a monster, a beast, or an odd child. It served as a source of admiration, amusement, and confusion among naturalists and travellers of the 16th and 17th centuries. We also raised the question about the identity of Carolus Clusius' sloth, a drawing published in Exoticorum libri decem (1605). We compared his drawing with earlier depictions and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bradypus; Brazil; Carolus Clusius; Georg Marcgrave; History of Zoology; Naturalists.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501799

On the presence of the subnarial foramen in Prestosuchus chiniquensis (Pseudosuchia: Loricata) with remarks on its phylogenetic distribution
Provedor de dados: 42
Autores: ROBERTO-DA-SILVA,LÚCIO; FRANÇA,MARCO A.G.; CABREIRA,SÉRGIO F.; MÜLLER,RODRIGO T.; DIAS-DA-SILVA,SÉRGIO.
ABSTRACT Many authors have discussed the subnarial foramen in Archosauriformes. Here presence among Archosauriformes, shape, and position of this structure is reported and its phylogenetic importance is investigated. Based on distribution and the phylogenetic tree, it probably arose independently in Erythrosuchus, Herrerasaurus, and Paracrocodylomorpha. In Paracrocodylomorpha the subnarial foramen is oval-shaped, placed in the middle height of the main body of the maxilla, and does not reach the height of ascending process. In basal loricatans from South America (Prestosuchus chiniquensis and Saurosuchus galilei) the subnarial foramen is 'drop-like' shaped, the subnarial foramen is located above the middle height of the main body of the maxilla, reaching...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archosauria; Extra cranial opening; Santa Maria Formation; Brazil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401309

Morphology of the first zoeal stages of five species of the portunid genus Callinectes (Decapoda, Brachyura) hatched at the laboratory
Provedor de dados: 42
Autores: MANTELATTO,FERNANDO L.; REIGADA,ÁLVARO L.D.; GATTI,ALINE C.R.; CUESTA,JOSÉ A.
The genus Callinectes Stimpson, 1860 currently consists of 16 species, six of which are reported in Brazilian coast. In the present study, the first zoeal stages of Callinectes bocourti,C. danae, C. exasperatus, C. ornatus and C. sapidus from Brazil were obtained from ovigerous females. The morphological and meristic characters of all these larval stages are described and illustrated. Those of C. bocourti, C. danae and C. sapidus are redescribed and compared with the previous descriptions, and differences are listed. Larval characters of these species were examined for interspecific differences, as well as larval features to distinguish the genus Callinectes within Portunidae. In addition, other portunid genera and species with a known first zoeal stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Larval morphology; Portunidae; Portunoidea; Zoea.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200755

Shallow aquifer response to climate change scenarios in a small catchment in the Guarani Aquifer outcrop zone
Provedor de dados: 42
Autores: MELO,DAVI C.D.; WENDLAND,EDSON.
ABSTRACT Water availability restrictions are already a reality in several countries. This issue is likely to worsen due to climate change, predicted for the upcoming decades. This study aims to estimate the impacts of climate change on groundwater system in the Guarani Aquifer outcrop zone. Global Climate Models (GCM) outputs were used as inputs to a water balance model, which produced recharge estimates for the groundwater model. Recharge was estimated across different land use types considering a control period from 2004 to 2014, and a future period from 2081 to 2099. Major changes in monthly rainfall means are expected to take place in dry seasons. Most of the analysed scenarios predict increase of more than 2 ºC in monthly mean temperatures. Comparing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Guarani Aquifer; Groundwater modelling; Groundwater recharge.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200391

Tectono-sedimentary evolution of the Itararé Subgroup (Late Paleozoic) in the southern Ponta Grossa arch, Brazil
Provedor de dados: 42
Autores: CANUTO,JOSÉ R.; ROCHA-CAMPOS,ANTONIO C.; SANTOS,PAULO R.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300013

Baalsaurus mansillai gen. et sp. nov. a new titanosaurian sauropod (Late Cretaceous) from Neuquén, Patagonia, Argentina
Provedor de dados: 42
Autores: CALVO,JORGE O.; RIGA,BERNARDO GONZALEZ.
Abstract We describe a dentary of a new titanosaur sauropod, Baalsaurus mansillai, gen. et sp. nov. from the Late Cretaceous of Patagonia, Argentina. The material comes from the Portezuelo Formation, Neuquén Group. Titanosaur sauropods lower jaws are scarce and only nine taxa with dentaries have been described. There are two types of morphology in titanosaur dentaries; “L” shaped or “U” shaped based on the shape, without a phylogenetic issue. In this paper; we recognize a new taxa, Baalsaurus mansillai, represented by an “L” shaped dentary with three apomorphic characters that are not present in other taxa: dentary alveoli with 10 teeth in the anterior ramus, a ventrally and anteriorly inclined symphysis and a wide ventral Meckelian groove surrounded by a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Dinosauria; Neuquén; Sauropoda; Upper Cretaceous.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400506

In vitro and cellular activities of the selected fruits residues for skin aging treatment
Provedor de dados: 42
Autores: LOURITH,NATTAYA; KANLAYAVATTANAKUL,MAYUREE; CHAIKUL,PUXVADEE; CHANSRINIYOM,CHAISAK; BUNWATCHARAPHANSAKUN,PICHAPORN.
ABSTRACT Peel extracts of litchi and rambutan, and that of tamarind seed coat were investigated in relation to their utility in skin-aging treatments. Standardized extracts of tamarind were significantly (p &lt; 0.05) more efficient at O2 •- scavenging (IC50 = 27.44 ± 0.09) than those of litchi and rambutan (IC50 = 29.57 ± 0.30 and 39.49 ± 0.52 μg/ml, respectively) and the quercetin standard (IC50 = 31.88 ± 0.15 μg/ml). Litchi extract proved significantly (p &lt; 0.05) more effective for elastase and collagenase inhibition (88.29 ± 0.25% and 79.46 ± 0.92%, respectively) than tamarind (35.43 ± 0.68% and 57.69 ± 5.97%) or rambutan (31.08 ± 0.38% and 53.99 ± 6.18%). All extracts were safe to human skin fibroblasts and inhibit MMP-2, with litchi extract...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agro-industrial waste; Antioxidant; Cellular activities; Cosmetics; Enzyme inhibitions; Fruit crop.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200577

Global environmental change research: empowering developing countries
Provedor de dados: 42
Autores: Nobre,Carlos A.; Lahsen,Myanna; Ometto,Jean P.H.B.
This paper discusses ways to reconcile the United Nations Millennium Development Goals with environmental sustainability at the national and international levels. The authors argue that development and better use of sustainability relevant knowledge is key, and that this requires capacity building globally, and especially in the less developed regions of the world. Also essential is stronger integration of high-quality knowledge creation and technology-and policy-development, including, importantly, the creation of centers of excellence in developing regions which effectively use and produce applications-directed high quality research and bring it to bear on decision making and practices related to environmental change and sustainable management of natural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sustainability; Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA); Knowledge; Development; Ecosystem services.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300012

Life-long Maternal Cafeteria Diet Promotes Tissue-Specific Morphological Changes in Male Offspring Adult Rats
Provedor de dados: 42
Autores: SANTOS,CAROLYNE D.S.; BALBO,SANDRA L.; GUIMARÃES,ANA T.B.; SAGAE,SARA C.; NEGRETTI,FÁBIO; GRASSIOLLI,SABRINA.
ABSTRACT Here, we evaluated whether the exposure of rats to a cafeteria diet pre- and/or post-weaning, alters histological characteristics in the White Adipose Tissue (WAT), Brown Adipose Tissue (BAT), and liver of adult male offspring. Female Wistar rats were divided into Control (CTL; fed on standard rodent chow) and Cafeteria (CAF; fed with the cafeteria diet throughout life, including pregnancy and lactation). After birth, only male offspring (F1) were maintained and received the CTL or CAF diets; originating four experimental groups: CTL-CTLF1; CTL-CAFF1; CAF-CTLF1; CAF-CAFF1. Data of biometrics, metabolic parameters, liver, BAT and WAT histology were assessed and integrated using the Principal Component Analysis (PCA). According to PCA analysis worse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Obesity; Dams; Offspring; Histology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602887

Optimum plot size of planting and bio-agroeconomic revenues from arugula-carrot intercropping systems in a semi-arid region
Provedor de dados: 42
Autores: DE CARVALHO,FRANK W.A.; NUNES,GLAUBER H.S.; BEZERRA NETO,FRANCISCO; BARROS JÚNIOR,AURÉLIO P.; DE LIMA,JAILMA S.S.; KHAN,AHMAD S.; DA SILVA,JOSÉ R.; MOREIRA,JOSERLAN N.
Abstract The production of vegetable crops has been characterized as a highly intensive activity in the use of soil, water, inputs and labor in semi-arid regions, being practiced mostly by small family farmers as a way of subsistence, or in the small-scale commercialization of surplus production. Among the agricultural practices that have been successfully used by vegetable producers are intercrop systems that, when implemented with adequate management, present gains in productivity, nutritional, economic, and environmental value. The aim of this study was to estimate the optimal plot sizes of plantings of carrot (Daucus carota L.) intercropped with arugula (Eruca sativa L.) in bi-cultivation in three spatial arrangements, as well as to determine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota; Eruca sativa; Plot size; Intercrop; Bio-agroeconomic index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703493

A comparative study of nutritional composition and potential use of some underutilized tropical fruits of Arecaceae
Provedor de dados: 42
Autores: SILVA,RAQUEL B.; SILVA-JÚNIOR,EDVALDO V.; RODRIGUES,LAÍS C.; ANDRADE,LAISE H.C.; SILVA,SUZENE I. DA; HARAND,WOLFGANG; OLIVEIRA,ANTONIO F.M.
In this study, pulp and kernel of fruits from six Arecaceae species were subjected to proximate analysis, fatty acid composition and total carotenoid content analysis. The species with the highest carbohydrate, lipid and protein values were Ptychosperma macarthurii(70.1 g/100 g in the kernel), Syagrus cearensis(40.6 g/100 g in the kernel), andS. coronata(20.6 g/100 g in the pulp). The ash content ranged from 0.61 to 7.51 g/100 g. Lauric, palmitic, and oleic acids were the major fatty acids identified. The total carotenoid contents and retinol activity equivalents were highest in the Pinanga kuhlii (180.3 µg/g) andAcrocomia intumescens (138.0 µg/g) pulp oils. Retinol activity equivalents varied between the investigated species (456 to 1515 μg RAE/100 g)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Foods; Oleic acid; Palm trees.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401701

A low-protein, high carbohydrate diet induces increase in serum adiponectin and preserves glucose homeostasis in rats
Provedor de dados: 42
Autores: CEOLIN,PATRÍCIA; FRANÇA,SUÉLEM A. DE; FROELICH,MENDALLI; SANTOS,MAÍSA P. DOS; PEREIRA,MAYARA P.; QUEIROZ,THAÍS S.; SILVA,FLÁVIA H.S. DA; LISBOA,PATRÍCIA C.; ANDRADE,CLAUDIA M.B.; BAVIERA,AMANDA M.; KAWASHITA,NAIR H.
Abstract: The aim of this study was investigate the effects of a low-protein, high-carbohydrate (LPHC) diet introduced to rats soon after weaning. The animals were distributed in the following groups: LPHC45: fed an LPHC diet (6%-protein, 74%-carbohydrate) for 45 days; C45: fed a control (C) diet (17%-protein, 63%-carbohydrate) for 45 days; R (Reverse): fed with LPHC for 15 days followed by C diet for 30 days. The LPHC45 group showed alterations in the energetic balance with an increase in brown adipose tissue, and in glucose tolerance, and lower final body weight, muscle mass and total protein in blood when compared with C45 group. The HOMA-IR index was similar between LPHC45 and C45 groups, but this parameter was lower in LPHC45 compared with R groups....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Low-protein; High-carbohydrate diet; Post-weaning period; HOMA-IR; Adiponectin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300714

Nutritional Evaluation of Non-Conventional Vegetables in Brazil
Provedor de dados: 42
Autores: SILVA,LUIS FELIPE LIMA E; SOUZA,DOUGLAS C. DE; RESENDE,LUCIANE V.; NASSUR,RITA DE CÁSSIA M.R.; SAMARTINI,CAROLINA Q.; GONÇALVES,WILSON M.
ABSTRACT The objective of this study was to characterize the nutritional compounds of interest present in vegetables known as non-conventional, in Brazil. The following evaluations were carried out: antioxidant activity, phenolic compounds, vitamin C, calories, carbohydrates, humidity, lipids, proteins, fiber, acidity and quantification of minerals (P, K, Ca, Mg, S, Cu, Fe, Mn, Zn and B). The species studied were Amaranthus hybridus L., Amaranthus viridis L., Basella alba L., Eryngium campestre L., Hibiscus sabdariffa L., Lactuca canadensis L., Rumex acetosa L., Stachys byzantina K. Koch, Tropaeolum majus L. and Xanthosoma sagittifolium L. Representative samples of plant structures of interest were harvested from each species suitable for human consumption...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioactive compounds; Food safety; Nutraceutical food; Traditional vegetables.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401775

A two-plasmid strategy for engineering a dengue virus type 3 infectious clone from primary Brazilian isolate
Provedor de dados: 42
Autores: SANTOS,JEFFERSON J.S.; CORDEIRO,MARLI T.; BERTANI,GIOVANI R.; MARQUES,ERNESTO T.A.; GIL,LAURA H.V.G.
Dengue infections represent one of the most prevalent arthropod-borne diseases worldwide, causing a wide spectrum of clinical outcomes. Engineered infectious clone is an important tool to study Dengue virus (DENV) biology. Functional full-length cDNA clones have been constructed for many positive-strand RNA viruses and have provided valuable tools for studying the molecular mechanisms involved in viral genome replication, virion assembly, virus pathogenesis and vaccine development. We report herein the successful development of an infectious clone from a primary Brazilian isolate of dengue virus 3 (DENV3) of the genotype III. Using a two-plasmid strategy, DENV3 genome was divided in two parts and cloned separately into a yeast-bacteria shuttle vector. All...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reverse genetics; Dengue virus; Molecular cloning; Infectious clone.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401749

Embedded positive constant r-mean curvature hypersurfaces in Mm × R
Provedor de dados: 42
Autores: Cheng,Xu; Rosenberg,Harold.
Let M be an m-dimensional Riemannian manifold with sectional curvature bounded from below. We consider hypersurfaces in the (m + 1)-dimensional product manifold M × R with positive constant r-mean curvature. We obtain height estimates of certain compact vertical graphs in M × R with boundary in M × {0}. We apply this to obtain topological obstructions for the existence of some hypersurfaces. We also discuss the rotational symmetry of some embedded complete surfaces in S² × R of positive constant 2-mean curvature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Product manifold; Hypersurface; R-mean curvature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200001

Sporothrix schenckii in a hospital and home environment in the city of Pelotas/RS - Brazil
Provedor de dados: 42
Autores: Mattei,Antonella S.; Madrid,Isabel M.; Santin,Rosema; Silva,Franklin V.; Carapeto,Luiz P.; Meireles,Mário C.A.
This study describes the isolation of S. schenckii in hospital and home environments in Brazil. Samples were collected from surfaces of a veterinary service place and at home. S. schenckii was detected in 1.5% of the samples from the hospital environment. However, this fungus was isolated from all sampled areas in home environments. The isolation of S. schenckii deonstrates that these surfaces could act as infection sources to anials and huans. Therefore, employees and pet owners could be exposed to this agent, and the contamination, through surfaces, could occur through the traumatic inoculation of the fungus or by direct contact with pre-existing lesions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment; Disinfection; Sporothrix schenckii; Surface.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400022

Toxicity and motor changes in Africanized honey bees (Apis mellifera L.) exposed to fipronil and imidacloprid
Provedor de dados: 42
Autores: BOVI,THAÍS S.; ZALUSKI,RODRIGO; ORSI,RICARDO O.
ABSTRACT This study evaluated the in vitro toxicity and motor activity changes in African-derived adult honey bees (Apis mellifera L.) exposed to lethal or sublethal doses of the insecticides fipronil and imidacloprid. Mortality of bees was assessed to determine the ingestion and contact lethal dose for 24 h using probit analysis. Motor activities in bees exposed to lethal (LD50) and sublethal doses (1/500th of the lethal dose) of both insecticides were evaluated in a behavioral observation box at 1 and 4 h. Ingestion and contact lethal doses of fipronil were 0.2316 ? 0.0626 and 0.0080 ? 0.0021 μg/bee, respectively. Ingestion and contact lethal doses of imidacloprid were 0.1079 ? 0.0375 and 0.0308 ? 0.0218 μg/bee, respectively. Motor function of bees...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment; Pesticides; Pollinators; Contamination; Phenylpyrazoles; Neonicotinoids.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100239

Chemical composition and nutrient degradability in elephant grass silage inoculated with Streptococcus bovisisolated from the rumen
Provedor de dados: 42
Autores: FERREIRA,DANIELE J.; ZANINE,ANDERSON M.; LANA,ROGÉRIO P.; RIBEIRO,MARINALDO D.; ALVES,GUILHERME R.; MANTOVANI,HILÁRIO C.
The objective of the present study was to assess the chemical and bromatological composition and in situ degradability of elephant grass silages inoculated with Streptococcus bovisisolated from cattle rumen. A complete randomized design was used with four treatments and six replications: elephant grass silage, elephant grass silage inoculated with 106 CFU/g Streptococcus bovisJB1 strains; elephant grass silage inoculated with 106 CFU/gStreptococcus bovis HC5 strains; elephant grass silage inoculated with 106 CFU/g Enterococcus faeciumwith six replications each. The pH and ammoniacal nitrogen values were lower (P&lt;0.05) for the silages inoculated with Streptococcus bovis JB1 and HC5, respectively. The silage inoculated withStreptococcus bovis had a higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestion; Microorganisms; Nutritive value; Ruminant.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100465

Bioethanol production with different dosages of the commercial Acrylamide polymer compared to a Bioextract in clarifying sugarcane juice
Provedor de dados: 42
Autores: FREITA,CRISTHYANE M.; FREITA,LIDYANE A.; TRALLI,LETICIA F.; SILVA,ALINE F.; MENDES,FRANCIELE Q.; TEIXEIRA,VITOR; MUTTON,MARCIA J.R.
ABSTRACT One of the most important steps is to clarify the juice, which are added synthetic polymer acrylamide base, aiming the fast settling of impurities present in the juice. However, this input is expensive and may have carcinogenic and neurotoxic actions to humans. The search for new natural flocculants that have similarity with the commercial product is of great value. A bioextract that may be promising and has coagulant action is the Moringa oleifera Lam. In this context, the objective of the research was to evaluate the consequences of the use of moringa seed extracts and various concentrations of commercial polymer, such as sedimentation aids in clarifying sugarcane juice in the ethanol production, comparing the efficiency of the bioextract...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofuels; Biopolymers; Juice treatment; Moringa oleifera Lam.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603093

Distribution pattern of anurans from three mountain complexes in southeastern Brazil and their conservation implications
Provedor de dados: 42
Autores: NEVES,MATHEUS O.; PEREIRA,ELVIS A.; SUGAI,JOSÉ LUIZ M.M.; ROCHA,SABINE B. DA; FEIO,RENATO N.; SANTANA,DIEGO J.
ABSTRACT Biogeographic tools support spatial distribution pattern hypotheses and help to determine priority areas for conservation. Our aim was to verify biogeographic patterns for anurans in three mountain complexes in southeastern Brazil, as well as to discuss the status of species conservation recorded and the biogeographical units evaluated. We selected 16 areas distributed in the Serra da Mantiqueira complex, south of Serra do Espinhaço and Serra da Canastra. We used the occurrence (geographic coordinates) of each species in the localities to determine areas of endemism applying the Endemicity Analysis method. We also tested whether similarity between areas was explained by geographic distance (Multiple Regression on distance Matrices-MRM). The Serra...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endangered species; Endemism; Highlands; Mantiqueira Complex; Serra da Canastra; Serra do Espinhaço.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401611

System-Pharmacology Dissection of Traditional Chinese herbs SINI Decoction for Treatment of Cardiovascular Diseases
Provedor de dados: 42
Autores: SHU,ZHIMING; WU,TIANTIAN; SHAHEN,MOHAMED; GUO,ZIHU; SHU,JIA; WANG,HE; SHAR,AKHTAR H.; FARAG,MAYADA R.; ALAGAWANY,MAHMOUD; EL-HACK,MOHAMED E. ABD; LIU,CHAOBIN.
﻿Abstract: Cardiovascular diseases (CVDs) are leading causes of death in the world, owing to noticeable incidence and mortality. Traditional Chinese Medicine (TCM) SINI Decoction (SND) is used to prevent and treat CVDs, which has attracted extensive attention for its moderate and little side effects. However, the involved molecular mechanisms are exceedingly complicated and remain unclear. Systems pharmacology, as a novel approach that integrates systems biology and pharmacology plays a significant role in investigating the molecular mechanism of TCM. In systems pharmacology approach, we use to systematically uncover the mechanisms of action in Chinese medicinal formula SND as an effective treatment for CVDs, which mainly includes:1) molecular database...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Systems pharmacology; SINI Decoction; Cardiovascular Diseases; Molecular mechanisms; Traditional Chinese herbs.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500804

Genotypic carriers of the obesity-associated FTO polymorphism exhibit different cardiometabolic profiles after an intervention
Provedor de dados: 42
Autores: MORAES,GREICE G.; REUTER,CÉZANE P.; RENNER,JANE D.P.; KLINGER,ELISA I.; FERREIRA,MICHELE B.; MELLO,ELZA D. DE; VALIM,ANDRÉIA DE M.; BURGOS,MIRIA S.
ABSTRACT  Background:  Children and adolescents with at-risk genotypes (AA/AT) of the rs9939609 polymorphism in FTO, a fat mass and obesity-associated gene, may exhibit different cardiometabolic profile responses than subjects with the TT genotype after an interdisciplinary intervention.  Methods:  The sample consisted of 36 school children from southern Brazil. We used DNA quantitation and real-time polymerase chain reaction (PCR) for polymorphism genotyping. We measured anthropometric parameters (body mass index (BMI), waist circumference, hip circumference, waist-hip ratio, body fat percentage and skinfold sum), biochemical parameters (glucose, lipid profile, ultra-sensitive C-reactive protein, uric acid, alanine aminotransferase, aspartate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotype; Intervention; Obesity; Children; Physical activity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602331

The use of Proteinase K to access genitalia morphology, vouchering and DNA extraction in minute wasps
Provedor de dados: 42
Autores: MARTINELLI,ARTURO B.; WAICHERT,CECILIA; BARBOSA,DIEGO N.; FAGUNDES,VALÉRIA; AZEVEDO,CELSO O.
ABSTRACT Genitalia are rich source of characters in insect taxonomy. Usually, they are examined after dissection and cleaning with potassium hydroxide (KOH), procedure that may damage both genital morphological structures and intracellular molecular contents. Enzymatic procedure with Proteinase K has been used to clean muscle off the genitalia while extract DNA, but its damage to the genital structures has not been evaluated. Herein, we qualitatively compare the use of KOH and Proteinase K to prepare genital structures in minute insects (Hymenoptera: Bethylidae). We show that Proteinase K is better to preserve the genital structure and provides quality DNA.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diaphanization; Genitalia preparation; KOH; Wolbachia.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401629

Geochemistry of tourmalines associated with iron formation and quartz veins of the Morro da Pedra Preta Formation, Serra do Itaberaba Group (São Paulo, Brazil)
Provedor de dados: 42
Autores: Garda,Gianna M.; Beljavskis,Paulo; Juliani,Caetano; Silva,Dailto.
Tourmalines of intermediate schorl-dravite composition occur in iron formation (including metachert and tourmalinites), metasediments, calc-silicate and metabasic/intermediate rocks of the Morro da Pedra Preta Formation, a volcanic-sedimentary sequence of the Serra do Itaberaba Group (northeast of São Paulo City, southeastern Brazil). The Morro da Pedra Preta Formation is crosscut by quartz veins that contain both intermediate schorl-dravite and an alkali-deficient, Cr-(V-)bearing tourmaline, in which the occupancy of the X-site is ϑ0.51Ca0.33Na0.15, characterizing it as intermediate to foitite and magnesiofoitite end-members. Mg# values for this tourmaline are higher than those for intermediate schorl-dravite. Raman spectroscopy also confirms the presence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schorl-dravite series; Foitite-magnesiofoitite; Serra do Itaberaba Group; Morro da Pedra Preta Formation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200008

The effect of Agaricus brasiliensis extract supplementation on honey bee colonies
Provedor de dados: 42
Autores: STEVANOVIC,JEVROSIMA; STANIMIROVIC,ZORAN; SIMEUNOVIC,PREDRAG; LAKIC,NADA; RADOVIC,IVICA; SOKOVIC,MARINA; GRIENSVEN,LEO J.L.D. VAN.
ABSTRACT This study was done to discover any beneficial effect of a medicinal mushroom Agaricus brasiliensis extract on the honey bee. Firstly, a laboratory experiment was conducted on 640 bees reared in 32 single-use plastic rearing cups. A. brasiliensis extract proved safe in all doses tested (50, 100 and 150 mg/kg/day) irrespective of feeding mode (sugar syrup or candy). Secondly, a three-year field experiment was conducted on 26 colonies treated with a single dose of A. brasiliensis extract (100 mg/kg/day) added to syrup. Each year the colonies were treated once in autumn and twice in spring. The treatments significantly increased colony strength parameters: brood rearing improvement and adult population growth were noticed more often than the increase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Colony strength; Medicinal mushroom ‘Cogumelo do Sol’; Natural-based supplement.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100219

Neuroprotective function of the endogenous prion: a new perspective for spongiform encephalopathies
Provedor de dados: 42
Autores: CHIARINI,LUCIANA B.; FREITAS,ADRIANA R.O.; MARTINS,VILMA R.; BRENTANI,RICARDO R.; LINDEN,RAFAEL.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300024

Combination sensitivity and processing of communication calls in the inferior colliculus of the Moustached Bat Pteronotus parnellii
Provedor de dados: 42
Autores: Portfors,Christine V.
Many animals use complex communication calls in social behaviors. In some species we know the features in the calls that elicit particular behaviors, but we do not understand how the auditory system encodes the calls. Nor do we understand the mechanisms underlying neural selectivity to calls. Our studies of the auditory midbrain of the Moustached Bat Pteronotus parnellii have revealed a neural mechanism important for generating selective responses to calls. Neurons that integrate information across different frequencies show selectivity to communication calls. "Combination sensitivity" may be a common mechanism for encoding complex sounds because it is also important for encoding echolocation signals.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auditory system; Inferior colliculus; Communication calls; Bat.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200010

The Lindley Weibull Distribution: properties and applications
Provedor de dados: 42
Autores: CORDEIRO,GAUSS M.; AFIFY,AHMED Z.; YOUSOF,HAITHAM M.; CAKMAKYAPAN,SELEN; OZEL,GAMZE.
Abstract We introduce a new three-parameter lifetime model called the Lindley Weibull distribution, which accommodates unimodal and bathtub, and a broad variety of monotone failure rates. We provide a comprehensive account of some of its mathematical properties including ordinary and incomplete moments, quantile and generating functions and order statistics. The new density function can be expressed as a linear combination of exponentiated Weibull densities. The maximum likelihood method is used to estimate the model parameters. We present simulation results to assess the performance of the maximum likelihood estimation. We prove empirically the importance and flexibility of the new distribution in modeling two data sets.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lindley G-Family; Maximum likelihood; Moments; Order statistics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602579

Chemical compositions and termiticidal activities of the heartwood from Calophyllum inophyllum L.
Provedor de dados: 42
Autores: Kadir,Roszaini; Awang,Khairul; Khamaruddin,Zaitihaiza; Soit,Zaini.
Wood extractives from heartwood of Callophylum inophyllum (bintangor) were obtained by shaker method and analyzed for their constituents by gas chromatography-mass spectrometry (GC-MS). Ten compounds were identified by ethanol (EtOH) solvents, fourteen by methanol (MeOH) and only nine by petroleum ether (PETETHR). Major compounds were contributed by monoterpenes (75.11%, 53.75%) when extracted with EtOH and PETETHR solvents. The anti-termitic assay of the wood extracts was also investigated against Coptotermes curvignathus. The level of concentration for anti-termite activity may be an indication of the dose application of the wood extracts for new development of termiticide.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calophyllum inophyllum; Chemical compositions; Ethanol; Methanol; Petroleum ether; Termiticide.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200743

Artificial tritrophic exposure system for environmental risk analysis on aphidophagous predators
Provedor de dados: 42
Autores: PAULA,DÉBORA P.; SOUZA,LUCAS M. DE; ANDOW,DAVID A.; SOUSA,ALEX A.T. CORTÊS DE; PIRES,CARMEN S.S.; SUJII,EDISON R.
ABSTRACT We evaluated an artificial tritrophic exposure system for use in ecotoxicological evaluations of environmental stressors on aphidophagous predators. It consists of an acrylic tube with a Parafilm M sachet containing liquid aphid diet, into which can be added environmental stressors. Immature Cycloneda sanguinea, Harmonia axyridis and Chrysoperla externa, and adult H. axyridis were reared on Myzus persicae. Larval and pupal development and survival of all species and reproductive parameters of H. axyridis were similar to published results. The system provides a suitable tritrophic exposure route, enables ex-ante evaluation of stressors, and improves the accuracy of the assessment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beneficial insects; Biosafety; Ecotoxicology; Exposure routes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401569

rDNA mapping, heterochromatin characterization and AT/GC content of Agapanthus africanus (L.) Hoffmanns (Agapanthaceae)
Provedor de dados: 42
Autores: REIS,ARYANE C.; FRANCO,ANA LUIZA; CAMPOS,VICTÓRIA R.; SOUZA,FLÁVIA R.; ZORZATTO,CRISTIANE; VICCINI,LYDERSON F.; SOUSA,SAULO M.
ABSTRACT Agapanthus (Agapanthaceae) has 10 species described. However, most taxonomists differ respect to this number because the great phenotypic plasticity of the species. The cytogenetic has been an important tool to aid the plant taxon identification, and to date, all taxa of Agapanthus L'Héritier studied cytologically, presented 2n = 30. Although the species possess large chromosomes, the group is karyologically little explored. This work aimed to increase the cytogenetic knowledge of Agapanthus africanus (L.) Hoffmanns by utilization of chromosome banding techniques with DAPI / CMA3 and Fluorescent in situ Hybridization (FISH). In addition, flow cytometry was used for determination of DNA content and the percentage of AT / GC nitrogenous bases....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: African lily; Chromosome banding; Cytotaxonomy; Flow cytometry; Genome size; Molecular cytogenetics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501727

Traditional and New methods for the Preparation of Diazocarbonyl Compounds
Provedor de dados: 42
Autores: BURTOLOSO,ANTONIO C.B.; MOMO,PATRÍCIA B.; NOVAIS,GRAZIELE L.
ABSTRACT For many years diazocarbonyl compounds have been studied due to their versatility and usability in many chemical transformations. In this review, we summarize the traditional methods to prepare these compounds as well as the new methods and recent improvements in experimental procedures. Moreover, emergence of continuous flow techniques has allowed safer and environmentally friendly procedures for the handling of diazomethane and diazo compounds and will also be a topic in this review.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acylation; Diazocarbonyl; Diazocompounds; Diazo transfer; Synthetic methodology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200859

Effect of acetylsalicylic acid on total myenteric neurons in mice experimentally infected with Trypanosoma cruzi
Provedor de dados: 42
Autores: SOUZA,NOEMI D. DE; BELIN,BRUNA S.; MASSOCATTO,CRISTINA L.; ARAÚJO,SILVANA M. DE; SANT’ANA,DÉBORA M.G.; ARAÚJO,EDUARDO J.A.; P. FILHO,PHILENO; NIHEI,OSCAR K.; MOREIRA,NEIDE M.
Abstract: We investigated the effects of acetylsalicylic acid (ASA) on the total myenteric neuronal population in the descending colon in Trypanosoma cruzi-infected mice. Thirty-five male Swiss mice, 60 days old, were divided into a control group (C group), control group treated with ASA (CA group), infected group (I group), and infected group treated with ASA (IA group). A total of 1300 trypomastigotes of the Y strain of T. cruzi were intraperitoneally inoculated in the IA and I groups. The CA and IA groups were treated with ASA intraperitoneally. At 75 days post-infection (dpi), all of the animals were sacrificed. Neurons in the colon were stained with Giemsa, quantified, and measured. No difference in the course of infection was observed between the IA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylsalicylic acid; Colon; Giemsa; Mice; Myenteric neurons; Trypanosoma cruzi.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300804

Genotoxic Maillard byproducts in current phytopharmaceutical preparations of Echinodorus grandiflorus
Provedor de dados: 42
Autores: LIMA-DELLAMORA,ELISANGELA C.; WALDHELM,KASSIA C.V.; ALVES,ADRIANA M.; LAGE,CLAUDIA A.S.; LEITÃO,ALVARO A.C.; KUSTER,RICARDO M.
Extracts of Echinodorus grandiflorus obtained from dried leaves by three different techniques were evaluated by bacterial lysogenic induction assay (Inductest) in relation to their genotoxic properties. Before being added to test cultures, extracts were sterilized either by steam sterilization or ultraviolet light. Only the extracts prepared by infusion and steam sterilized have shown genotoxic activity. The phytochemical analysis revealed the presence of the flavonoids isovitexin, isoorientin, swertisin and swertiajaponin, isolated from a genotoxic fraction. They were assayed separately and tested negative in the Inductest protocol. The development of browning color and sweet smell in extracts submitted to heat, prompted further chemical analysis in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Echinodorus grandiflorus; Genotoxicity; Maillard's Reaction; Flavonoids.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301385

Effect of prey concentrations and feed training on production of Hoplias lacerdae juvenile
Provedor de dados: 42
Autores: LUZ,RONALD K.; PORTELLA,MARIA CÉLIA.
The aim of this work was to investigate the effects of daily prey concentration during the first 15 days of active feeding of Hoplias lacerdae larvae, and the juvenile size on the feed training. In the first phase, the larvae received five Artemia nauplii concentrations (P). In the second phase, the juveniles from each treatment were trained to accept formulated diet. Superior growth was related to higher initial daily prey concentrations (900 and 1100 nauplii larvae-1). During feed training, the growth tendency was similar to that verified in the first phase. The lowest values of specific growth rate (SGR) were registered after the introduction of the semi-moist diet used in the feed training. However, the values of SGR recovered along the experiment and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artemia; Feeding management; Larviculture; Formulated diet.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201125

The Trofobiose Theory and organic agriculture: the active mobilization of nutrients and the use of rock powder as a tool for sustainability
Provedor de dados: 42
Autores: Polito,Wagner L.
The primary objective of the present paper is to link some relevant concepts on the use of ecological agricultural practices to the production of food crops. In a special topic the Trofobiose Theory, as well as the principle of Active Dissolution of Rocks are considered as important tools in improving the sustainability of Organic, Biodynamic and Process Agricultures.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sustainability; Trofobiose; Vegetal nutrition; Nutritional equilibrium; Agro-ecology; Rock powders; Mineral fertilizations; Organic fertilization.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400011

Atmospheric particle dry deposition of major ions to the South Atlantic coastal area observed at Baía de Todos os Santos, Brazil
Provedor de dados: 42
Autores: MKOMA,STELYUS L.; ROCHA,GISELE O. DA; DOMINGOS,JOSÉ S.S.; SANTOS,JOÃO V.S.; CARDOSO,MANUELA P.; SILVA,ROGERIO L. DA; ANDRADE,JAILSON B. DE.
The coastal atmosphere adjacent to large urban areas can be strongly affected by the emission of air pollutants, among them, major ions species. In this study, the chemical composition and sources of carboxylates and other water-soluble ions in fine and coarse aerosols as well as estimates of particle dry deposition fluxes were studied at a tropical coastal site affected by an urban environment. The mean concentrations of the total carboxylates were 78 ng m–3 in fine fraction and 81 ng m–3 in coarse fraction of particulate matter (PM). The corresponding values for the total inorganic ions were 2143 ng m–3 and 4880 ng m–3 respectively. Main sources for fine particles were:(i) photochemical formation of carboxylic acids in vapor phase and a posterior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Particle dry deposition; PM; Major ions; Tropical atmosphere; Baia de Todos os Santos bay; Brazil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100037

Electrospinning synthesis and assessment of physicochemical properties and biocompatibility of cobalt nitrate fibers for wound healing applications
Provedor de dados: 42
Autores: JAGANATHAN,SARAVANA KUMAR; MANI,MOHAN P.
Abstract: The aim of this study was to develop polyurethane (PU) wound dressing incorporated with cobalt nitrate using electrospinning technique. The morphology analysis revealed that the developed composites exhibited reduced fiber and pore diameter than the pristine PU. The electrospun membranes exhibited average porosity in the range of 67% - 71%. Energy-dispersive X-ray spectra (EDS) showed the presence of cobalt in the PU matrix. The interaction of cobalt nitrate with PU matrix was evident in Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The contact angle results indicated the improved wettability of the prepared PU/cobalt nitrate composites (82° ± 2) than the pure PU (100° ± 1). The incorporation of cobalt...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Cobalt nitrate; Electrospun fibers; Skin tissue engineering; Physico-chemical characteristics; Bio compatibility.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500901

Ecological aspects of natural populations of Hyalella pampeana (Crustacea, Amphipoda, Hyalellidae) from the Natural Reserve Island of Martín García (Río de La Plata, Argentina)
Provedor de dados: 42
Autores: COLLA,MARÍA FLORENCIA; CÉSAR,INÉS I.
Abstract: Freshwater amphipods of the genus Hyalella have a great importance in aquatic ecosystems due to their role in matter and energy cycling and its utilization as bioindicators of environmental health. The aim of this work was to analyze relevant population parameters of Hyalellapampeana, such as population density and structure, individual body size, sex ratio, fecundity and recruitment, and to study the possible relation of these parameters to variations in environmental variables. Samples were taken monthly during a one-year period (2006) at three small ponds in the Natural Reserve Island of Martín García, Argentina. The inland aquatic environments showed distinctive physicochemical characteristics, mainly related to pH and conductivity values....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater amphipoda; Body size; Fecundity; Sex ratio.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100620

Physico-chemical and sensory evaluation of potato (Solanum tuberosum L.) after irradiation
Provedor de dados: 42
Autores: SOARES,IVANESA G.M.; SILVA,EDVANE B.; AMARAL,ADEMIR J.; MACHADO,ERILANE C.L.; SILVA,JOSENILDA M.
ABSTRACT This work evaluated the effects of ionizing radiation on the physico-chemical and sensory characteristics of the potato cultivar Ágata (Solanum tuberosum L.), including budding and deterioration, with the end goal of increasing shelf life. For this, four groups of samples were harvested at the maturation stage. Three of them were separately exposed to a Co-60 source, receiving respective doses of 0.10, 0.15 and 2.00 kGy, while the non-irradiated group was kept as a control. All samples were stored for 35 days at 24 °C (± 2) and at 39% relative humidity. The following aspects were evaluated: budding, rot, loss of weight, texture, flesh color, moisture, external and internal appearance, aroma, soluble solids, titratable acidity, vitamin C, protein,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Irradiation; Potato; Spoilage; Storage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300941

Going Beyond Academic Integrity Might Broaden our Understanding of Plagiarism in Science Education: A Perspective from a Study in Brazil
Provedor de dados: 42
Autores: SANTOS,CHRISTIANE C.; SANTOS,PATRÍCIA S. DOS; SANT'ANA,MAURÍCIO C.; MASUDA,HATISABURO; BARBOZA,MONICA B.; VASCONCELOS,SONIA M.R.
ABSTRACT Fostering innovation and creativity is a priority in the science and education policy agenda of most countries, which have advocated that innovative minds and processes will boost scientific and economic growth. While our knowledge society has embraced this view, fostering creativity is among the major challenges faced by educators and policymakers. For example, plagiarism, which may be considered a form of imitation and repetition, is a global concern at schools and universities. However, most discussions focus on academic integrity, which, we believe, leaves some gaps in the approach to the problem. As part of an ongoing project on plagiarism, science and education policy, we show results from a survey sent to 143 high-school science teachers at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Research integrity; Plagiarism; Science education; Science policy; Rote learning.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200757

Mutations in the melanocortin-1 receptor (MC1R) gene have no influence on the distinct patterns of melanic plumage found in the manakins of the genus Antilophia (Aves: Pipridae)
Provedor de dados: 42
Autores: LUNA,LEILTON W.; SILVA,WEBER A. GIRÃO E; ARARIPE,JULIANA; PEREIRA,ISADORA T.F.; D'HORTA,FERNANDO M.; SAMPAIO,IRACILDA; SCHNEIDER,HORACIO; RÊGO,PÉRICLES S. DO.
Abstract The melanocortin-1 receptor gene is the most widely-used marker for the investigation of the genetic determination of melanic plumage patterns. Studies of a number of wild bird species have shown an association between non-synonymous mutations of the MC1R gene and the presence of melanic variants. The genus Antilophia (Pipridae) includes only two manakin species (A. galeata and A. bokermanni), which are distinguished primarily by the differences in the pattern of melanic coloration of the plumage of the mantle in the adult males. In A. galeata, this plumage is black, while in A. bokermanni, it is predominantly white. This study investigates the possible association between mutations of the MC1R marker and the variation in plumage coloration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candidate gene; Manakin; Melanism; Neutral evolution; Plumage color.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602873

Structural analysis of the Rio Preto fold belt (northwestern Bahia / southern Piauí), a doubly-vergent asymmetric fan developed during the Brasiliano Orogeny
Provedor de dados: 42
Autores: CAXITO,FABRÍCIO A.; UHLEIN,ALEXANDRE; MORALES,LUIZ F.G.; EGYDIO-SILVA,MARCOS; SANGLARD,JULIO C.D.; DIAS,TATIANA G.; MENDES,MONICA C.O.
The Rio Preto fold belt borders the northwestern São Francisco craton and shows an exquisite kilometric doubly-vergent asymmetric fan structure, of polyphasic structural evolution attributed exclusively to the Brasiliano Orogeny (∼600-540 Ma). The fold belt can be subdivided into three structural compartments: The Northern and Southern compartments showing a general NE-SW trend, separated by the Central Compartment which shows a roughly E-W trend. The change of dip of S2, a tight crenulation foliation which is the main structure of the fold belt, between the three compartments, characterizes the fan structure. The Central Compartment is characterized by sub-vertical mylonitic quartzites, which materialize a system of low-T strike slip shear zones...
Palavras-chave: Brasiliano Orogeny; Doubly-vergent fan; Rio Preto fold belt; São Francisco craton; Structural analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301101

Cell Division in genus Corynebacterium: protein-protein interaction and molecular docking of SepF and FtsZ in the understanding of cytokinesis in pathogenic species
Provedor de dados: 42
Autores: OLIVEIRA JR,ALBERTO F.; FOLADOR,EDSON L.; GOMIDE,ANNE C.P.; GOES-NETO,ARISTÓTELES; AZEVEDO,VASCO A.C.; WATTAM,ALICE R.
ABSTRACT The genus Corynebacterium includes species of great importance in medical, veterinary and biotechnological fields. The genus-specific families (PLfams) from PATRIC have been used to observe conserved proteins associated to all species. Our results showed a large number of conserved proteins that are associated with the cellular division process. Was not observe in our results other proteins like FtsA and ZapA that interact with FtsZ. Our findings point that SepF overlaps the function of this proteins explored by molecular docking, protein-protein interaction and sequence analysis. Transcriptomic analysis showed that these two (Sepf and FtsZ) proteins can be expressed in different conditions together. The work presents novelties on molecules...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell division; Corynebacterium; FtsZ; SepF; Molecular docking.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502179

Silver and gold nanoparticles from tannic acid: synthesis, characterization and evaluation of antileishmanial and cytotoxic activities
Provedor de dados: 42
Autores: LOPES,LOURDES C.S.; BRITO,LUCAS M.; BEZERRA,THAYLLAN T.; GOMES,KLEYTON N.; CARVALHO,FERNANDO A. DE A.; CHAVES,MARIANA HELENA; CANTANHÊDE,WELTER.
Abstract Gold (Au0) and silver (Ag0) nanoparticles were synthesized using tannic acid (TA) as both reducing and stabilizer. Nanoparticles formation, stability, and interaction with TA were compared to citrate-coated nanoparticles and monitored by UV-Vis, zeta potential, and transmission electron microscopy. TA coating resulted in a red-shift and broadening of bands compared to citrate-coated nanoparticles (NPs-Cit). AgNPs-TA and AuNPs-TA are negatively charged with mean surface charge of -29.4 mV and -29.6 mV, respectively. TEM images showed polydispersety of AuNPs-TA (6-42 nm) and aggregation of AgNPs-TA (12-71 nm). In vitro assays of Leishmania amazonensis promastigotes showed an increment of antileishmanial activity for AgNPs-TA in relation to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green synthesis; Leishmaniasis; Metallic nanoparticles; Tannic acid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602679

Preparation and characterization of hydroxyapatite-coated iron oxide particles by spray-drying technique
Provedor de dados: 42
Autores: Donadel,karina; Felisberto,Marcos D.V.; Laranjeira,Mauro C.M.
Magnetic particles of iron oxide have been increasingly used in medical diagnosis by magnetic resonance imaging and in cancer therapies involving targeted drug delivery and magnetic hyperthermia. In this study we report the preparation and characterization of iron oxide particles coated with bioceramic hydroxyapatite by spray-drying. The iron oxide magnetic particles (IOMP) were coated with hydroxyapatite (HAp) by spray-drying using two IOMP/HAp ratios (0.7 and 3.2). The magnetic particles were characterized by way of scanning electronic microscopy, energy dispersive X-ray, X-ray diffraction, Fourier transformed infrared spectroscopy, flame atomic absorption spectrometry,vibrating sample magnetometry and particle size distribution (laser diffraction). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron oxide particles; Hydroxyapatite; Spray-drying.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200004

Physicochemical quality profiles of commercial oral tablets and capsules containing lutein – impact of insufficient specific sanitary regulations
Provedor de dados: 42
Autores: ANSELMO,CARINA DE S.; MENDES,THAMARA C.; CABRAL,LUCIO M.; SOUSA,VALÉRIA P. DE.
Abstract Dietary supplements in many countries such as the USA do not require registration prior to commercialization. The Agência Nacional de Vigilância Sanitária (ANVISA) registers substances with functional properties as foods. Lutein is a carotenoid with antioxidant activity available on the market. However, no regulatory mandates exist to govern the design of quality control tests, which are necessary to ensure formulation effectiveness. Therefore, in the present study, tablet and dosage formulations from different manufacturers were tested following general methods outlined in the Brazilian and American Pharmacopeias. The averageweight, disintegration, content and dose uniformity assays were performed for all tablets and capsules, whereas hardness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dietary supplements; Lutein; Quality control; Age-related macular degeneration.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603063

Neutral detergent fibre in piglet diets: digestibility, performance, and deposition of body nutrients
Provedor de dados: 42
Autores: NEPOMUCENO,RAFAEL C.; WATANABE,PEDRO H.; FREITAS,EDNARDO R.; CARVALHO,LUIZ E. DE; OLIVEIRA,EMANUELA L. DE; GOMES,THALLES R.; AGUIAR,GERMANA C.; CANDIDO,RAYSSA S.; FERREIRA,JORDÂNIA L.; VEIRA,ALINI M.
ABSTRACT A total 120 piglets with an average live weight of 7.00 kg, weaned at 21 days, were used to evaluate the effect of neutral detergent fibre levels on the digestibility of nutrients and energy from the diets, productive performance, and the composition and rate of deposition of nutrients and energy in the bodies of piglets in the nursery phase. The animals were distributed according to a randomized-block design into five treatments, which consisted of neutral detergent fibre levels, with six replicates and four animals per plot. A quadratic effect was detected for the digestibility coefficients of nutrients and energy, feed intake and weight gain. The increase in fibre level promoted a linear increase in fat content in the carcass, blood, and body,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dietary fibre; Retention of nutrients; Pigs; Post-weaning.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100439

Establishment of research-oriented hospital: an important way for translational medicine development in China
Provedor de dados: 42
Autores: LI,MEINA; ZHANG,LULU.
Globally, one of the major trends is the development of translational medicine. The traditional hospital structure could not meet the demands of translational medicine development any longer and to explore a novel hospital structure is imperative. Following the times, China proposed and implemented a development strategy for a first-class modern research-oriented hospital. To establish a research-oriented hospital has become an important strategy to guide the scientific development of high-quality medical institutions and to advance translational medicine development. To facilitate translational medicine by developing research-oriented hospital, the Chinese Research Hospital Association (CRHA) has been established, which provides service of medicine,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Translational medicine; Clinical and translational research; Management; Collaboration; Research hospital.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201027

Floristic-functional variation of tree component along an altitudinal gradient in araucaria forest areas, in Southern Brazil
Provedor de dados: 42
Autores: SOBOLESKI,VANESSA F.; HIGUCHI,PEDRO; SILVA,ANA CAROLINA DA; SILVA,MARIELE A.F. DA; NUNES,AMANDA S.; LOEBENS,RODINELI; SOUZA,KARINE DE; FERRARI,JHENIFFER; LIMA,CARLA L.; KILCA,RICARDO V.
ABSTRACT We aimed to investigate the taxonomic and functional variations of tree component of Araucaria Forest (AF) areas located along an altitudinal gradient (700, 900 and 1,600 m asl), in the southern region of Brazil. The functional traits determined were leaf area, specific leaf area, wood density, maximum potential height and dispersal syndromes and deciduousness. The data were analyzed through a functional and taxonomic dissimilarity dendrograms, community-weighted mean trait values, parametric and nonparametric tests, and Principal Component Analysis. The largest floristic-structural similarity was observed between the lower altitude areas (700 and 900 m asl), whose Bray-Curtis distance was 0.63. The area at 700 m asl was characterized by a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional traits; Altitude; Similarity; Subtropical forest.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502219

Diagnostic and prognostic characteristics of phytotoxicity caused by fluoride on Spondias dulcis Forst. F. (Anacardiaceae)
Provedor de dados: 42
Autores: Sant'Anna-Santos,Bruno F.; Azevedo,Aristéa A.; Silva,Luzimar C.; Oliva,Marco A.
The goal of this study was to determine the symptoms and microscopic damage caused by fluoride on Spondias dulcis, a fluoride-sensitive species. The plants were exposed to simulated fog with fluoride (0, 5, 10, 15 and 20 mg L-1) for 20 min daily during four consecutive days. Samples from leaflets without any apparent fluoride injury were collected to microscopic analysis. The percentage of necrosed leaf area was measured, and the level of pollutant in the dry matter from the basal and apical portions of the plant was determined. The necroses began 24 h after the first simulation mainly from the base of the leaflets. A higher level of necrosis was observed at the apical portion of the plants, a region of higher fluoride accumulation. The damage on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf anatomy; Bioindicator; Necrosis; Pollution; Symptomatology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300011

Physicochemical, in vitro and in vivo evaluation of flurbiprofen microemulsion
Provedor de dados: 42
Autores: NAEEM,MUHAMMAD; RAHMAN,NISAR UR; TAVARES,GUILHERME. D.; BARBOSA,SÁVIO F.; CHACRA,NÁDIA B.; LÖBENBERG,RAIMAR; SARFRAZ,MUHAMMAD K.
ABSTRACTFlurbiprofen, a potent nonsteroidal anti-inflammatory drug, is widely used for relief of pain in patients suffering from rheumatic diseases, migraine, sore throat and primary dysmenorrheal. However, this drug has many gastrointestinal side effects produced by its oral administration, such as gastric bleeding and peptic ulcer. These effects were responsible for non-compliance among patients, which ultimately results in treatment failure. The physicochemical properties of flurbiprofen, make it a suitable candidate for transdermal drug delivery, which can overcome the drawbacks of oral administration. In this sense, microemulsions have been proved to increase the cutaneous absorption of lipophilic drugs when compared to conventional drug delivery...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-inflammatory study; Flurbiprofen; Gels; In vitro permeation; Microemulsion.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401823

On Vastness and Variability: Cultural Transmission, Historicity, and the Paleoindian Record in Eastern South America
Provedor de dados: 42
Autores: ARAUJO,ASTOLFO G.M.
Eastern South America, or what is today Brazilian territory, poses interesting questions about the early human occupation of the Americas. Three totally distinct and contemporaneous lithic technologies, dated between 11,000 and 10,000 14C BP, are present in different portions of the country: the Umbu tradition in the south, with its formal bifacial industry, with well-retouched scrapers and bifacial points; the Itaparica tradition in the central-west / northwest, totally unifacial, whose only formal artifacts are limaces; and the "Lagoa Santa" industry, completely lacking any formal artifacts, composed mainly of small quartz flakes. Our data suggests that these differences are not related to subsistence or raw-material constraints, but rather to different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleoindian; Lithic technology; Umbu; Itaparica; Lagoa Santa; Cultural transmission.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201239

Anatomical, phytochemical and histochemical study of Solidago chilensis Meyen
Provedor de dados: 42
Autores: SOUZA,DOUGLAS M.F. DE; SÁ,RAFAELA D.; ARAÚJO,EVANI L.; RANDAU,KARINA P.
ABSTRACT Solidago chilensis Meyen, belonging to the family Asteraceae, is a plant native to South America and the only representative of the genus in Brazil. This species is popularly known as “arnica” and is used to treat bruises, muscle pain and inflammation. The objective of this work was to contribute to the pharmacognostic standardization of S. chilensis. Cross-sections were obtained, by freehand, for microscopic analysis of root, stem and leaf; for these parts of the plant maceration was also performed according to the method of Jeffrey. For the leaf were still made paradermal sections, scanning electron microscopy analysis, phytochemical and histochemical tests. Thus, it was determined anatomical features useful for diagnosis of the species which,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Arnica; Asteraceae; Histochemistry; Phytochemistry; Solidago chilensis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502107

Botanical aspects of Heteropterys umbellata (Malpighiaceae): a cytological and palynological approach
Provedor de dados: 42
Autores: Sousa,Saulo M.; Reis,Aryane C.; Gomes,Shaiany S.L.; Bernardo,Karina B.; Salimena,Fátima R.G.; Viccini,Lyderson F.
The genus Heteropterys is one of the major genera in Malpighiaceae. However, few cytological and palynological studies were reported. The present work described for the first time the chromosome number, heterochromatin pattern, meiotic behavior, pollen viability and palynological aspects of Heteropterys ubellata, a very spread species. One large Brazilian population was evaluated using conventional techniques for meiotic studies and acetolyse to access the pollen morphology. The species showed 2n = 20 chromosomes, normal meiotic development and viable pollens. Great blocks of heterochromatin were observed around the centromers. DAPI staining was positive for centroeric heterochroatin, hile CMA3 ark as observed just at terinal regions of one pair of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome number; Heterochromatin pattern; Heteropterys umbellata; Malpighiaceae; Meiosis; Pollen viability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400009

Expression of manganese peroxidase by Lentinula edodes and Lentinula boryana in solid state and submerged system fermentation
Provedor de dados: 42
Autores: HERMANN,KATIA L.; COSTA,ALESSANDRA; HELM,CRISTIANE V.; LIMA,EDSON A. DE; TAVARES,LORENA B.B.
The production of ethanol from lignocellulosic biomass is referred as a second generation biofuel, whose processing is one of the most promising technologies under development. There are few available studies on the use of enzymes produced by fungi as active for the biodegradation of lignocellulosic biomass. However, the manganese peroxidase (MnP) enzyme presents high potential to degrade lignin and the basidiomycetes are the major producers of this oxidase. Thus, this study aimed at evaluating the ability of fungi Lentinula edodes and Lentinula boryana to produce this enzyme when cultivated in submerged fermentation system (SS) and also in solid-state fermentation system (SSF) containing Eucalyptus benthamii sawdust with or without corn cob meal. In the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Basidiomycetes; Eucalyptus benthamii; Enzyme; Ethanol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300965

Antioxidant and antimicrobial potential of selected varieties of Piper betle L. (Betel leaf)
Provedor de dados: 42
Autores: SARMA,CHAYANIKA; RASANE,PRASAD; KAUR,SAWINDER; SINGH,JYOTI; SINGH,JOGINDER; GAT,YOGESH; GARBA,UMAR; KAUR,DAMANPREET; DHAWAN,KAJAL.
Abstract Piper betle L., is an evergreen perennial creeper belonging to family Piperaceae and is known to possess numerous medicinal properties. Current study focuses on evaluating antioxidant and antimicrobial potential of betel leaf. For the present study, distilled water, hexane, acetone and ethanolic extracts of two varieties of betel leaves: Meetha paan and Banarasi paan were used. Biochemical tests such as proximate analysis (moisture, ash, protein, lipids, minerals viz., sodium and potassium), antioxidant activity tests (DPPH radical scavenging activity, total phenolics, ascorbic acid, reducing power) and antimicrobial test (antibacterial and antifungal susceptibility test) against four pathogens viz., B. subtilis, E. coli, A. niger and S....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper betle; Piperaceae; Antioxidant; Antimicrobial; Biochemical.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703871

Parasitic communities of Hoplosternum littorale (Hancock, 1828) as indicators of environmental impact
Provedor de dados: 42
Autores: DIAS,KARINA G.A; ALVES,CARLOS A.; SILVA,REINALDO J. DA; ABDALLAH,VANESSA D.; AZEVEDO,RODNEY K. DE.
ABSTRACT The parasites are indicative of several biological aspects of their hosts, including their diet, migration, recruitment and phylogeny, but they can also be direct indicators of the environmental quality. Hoplosternum littorale is a fish that has a high commercial value in some South American countries. The fishes were collected from January to July 2012, in two locations of the Peixe River in the municipality of Anhembi, State of São Paulo, Brazil, which had different environmental and limnological characteristics (river mouth and Lagoa Cabeça de Boi). An amount of 30 fish specimens were captured in each location for the analysis of their parasitic fauna. Nine species of metazoan parasites were collected. Both Brillouin`s diversity index and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindicators; Callichthyidae; Parasites; Peixe River; São Paulo.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502317

"Sapium glandulatum Complex" (Euphorbiaceae)
Provedor de dados: 42
Autores: Valle,Luci de Senna; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200022

Evidence for a role of nitric oxide in hindlimb vasodilation induced by hypothalamic stimulation in anesthetized rats
Provedor de dados: 42
Autores: Ferreira-Neto,Marcos L.; Possas,Olga S.; Lopes,Oswaldo U.; Cravo,Sérgio L.
Electrical stimulation of the hypothalamus produces cardiovascular adjustments consisting of hypertension, tachycardia, visceral vasoconstriction and hindlimb vasodilation. Previous studies have demonstrated that hindlimb vasodilation is due a reduction of sympathetic vasoconstrictor tone and to activation of beta2-adrenergic receptors by catecholamine release. However, the existence of a yet unidentified vasodilator mechanism has also been proposed. Recent studies have suggested that nitric oxide (NO) may be involved. The aim of the present study was to investigate the role of NO in the hindquarter vasodilation in response to hypothalamic stimulation. In pentobarbital-anesthetized rats hypothalamic stimulation (100 Hz, 150µA, 6 s) produced hypertension,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hindlimb blood flow; Hypothalamus; Electrical stimulation; Defense reaction.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200005

Visual impairment and blindness: an overview of prevalence and causes in Brazil
Provedor de dados: 42
Autores: Salomão,Solange R.; Mitsuhiro,Márcia R. K. H.; Belfort Jr,Rubens.
Our purpose is to provide a summary overview of blindness and visual impairment on the context of recent Brazilian ocular epidemiologic studies. Synthesis of data from two cross-sectional population-based studies - the São Paulo Eye Study and the Refractive Error in School Children Study is presented. 3678 older adults and 2441 school children were examined between July 2004 and December 2005. Prevalence of blindness in older adults using presenting visual acuity was 1.51% decreasing to 1. 07% with refractive correction. The most common causes of blindness in older adults were retinal disorders, followed by cataract and glaucoma. In school children, the prevalence of uncorrected visual impairment was 4.82% decreasing to 0.41% with refractive correction....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blindness; Visual impairment; Prevalence; Population-based; Ocular epidemiology.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300017

Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil
Provedor de dados: 42
Autores: Hartmann,Léo A.; Santos,João O.S.; Leite,Jayme A.D.; Porcher,Carla C.; Mcnaughton,Neal J.
The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizário ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex. Magmatic evidence of the magnesian basalt or pyroxenite protolith is only preserved in cores of zircon crystals, which are dated at 2257 ± 12 Ma. Amphibolite facies metamorphism M1 formed voluminous hornblende in the investigated rock possibly at 1989 ± 21 Ma. This ultramafic rock was re-metamorphosed at 702±21 Ma during a greenschist facies eventM2; the assemblage actinolite + oligoclase + microcline + epidote + titanite + monazite formed by alteration of hornblende. The metamorphic events are probably related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultramafic amphibolite; Zircon geochronology; Encantadas Complex; Trans-Amazonian Cycle; Metamorphism.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300010

Bernstein-type theorems in hypersurfaces with constant mean curvature
Provedor de dados: 42
Autores: CARMO,MANFREDO P. DO; ZHOU,DETANG.
By using the nodal domains of some natural function arising in the study of hypersurfaces with constant mean curvature we obtain some Bernstein-type theorems.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riemannian manifold; Eigenvalue; Hypersurface; Mean curvature.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300003

Campo Belo Metamorphic Complex: tectonic evolution of an Archean sialic crust of the southern São Francisco Craton in Minas Gerais (Brazil)
Provedor de dados: 42
Autores: OLIVEIRA,ARILDO H.; CARNEIRO,MAURÍCIO A.
Systematic geological studies performed in the study area allowed the characterization of six lithodemic units: three gneissic, one amphibolitic, one supracrustal and one fissure mafic. The mineral assemblage and the structural record of these lithodemic units indicate that the study area was affected by five tectonothermal events. The structural pattern of the first and oldest event occurred under granulite facies conditions and reveals essentially a sinistral kinematic pattern. The second event, showing dominant extensional characteristics, is related to the generation of an ensialic basin filled by the volcano-sedimentary sequence of the supracrustal lithodemic unit. The third event, which is the most expressive in the study region, is characterized by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Craton; Archean; Tectonic evolution; Lithodemic units; Metamorphic complex.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300009

Crambe (Crambe abyssinica) and sunflower (Helianthus annuus) protein concentrates: production methods and nutritional properties for use in fish feed
Provedor de dados: 42
Autores: LOVATTO,NAGLEZI M.; GOULART,FERNANDA R.; LOUREIRO,BRUNO B.; SPERONI,CAROLINE S.; BENDER,ANA B.B.; GIACOMINI,SANDRO J.; RADÜNZ NETO,JOÃO; SILVA,LEILA P. DA.
ABSTRACT The purpose of this study was to develop and improve protein concentration techniques for two industrial by-products with the potential for use in fish feed. In particular, we chemically characterized crambe meal and sunflower meal and their protein concentrates. Three different protein concentration methods were tested: isoelectric pH (pHi), acid pH and alkaline pH. For crambe and sunflower meals extraction using the pHi method was most efficient in terms of protein yield and crude protein content in the concentrates; this method also increased lysine and methionine content in the concentrates. The water holding capacity of the sunflower protein concentrate was greater than that of the crambe protein concentrate. The crambe protein concentrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Antinutrients; Aquafeeds; Byproducts; Phenolic compounds; Protein concentration.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502495

Erratum to "Production of transgenic goat (Capra hircus) with human Granulocyte Colony Stimulating Factor (hG-CSF) gene in Brazil"
Provedor de dados: 42
Tipo: Info:eu-repo/semantics/article
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100004

Role of the serotoninergic system in the sodium appetite control
Provedor de dados: 42
Autores: Reis,Luís C.
The present article reviews the role of the serotoninergic system in the regulation of the sodium appetite. Data from the peripheral and icv administration of serotoninergic (5-HTergic) agents showed the participation of 5-HT2/3 receptors in the modulation of sodium appetite. These observations were extended with the studies carried out after brain serotonin depletion, lesions of DRN and during blockade of 5-HT2A/2C receptors in lateral parabrachial nucleus (LPBN). Brain serotonin depletion and lesions of DRN increased the sodium appetite response, in basal conditions, after sodium depletion and hypovolemia or after beta-adrenergic stimulation as well. These observations raised the hypothesis that the suppression of ascending pathways from the DRN,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydroelectrolyte balance; Sodium appetite; 5-HTergic system; Dorsal raphe nucleus; Lateral parabrachial nucleus; 5-HTergic agents.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200009

Is there still room to explore cyclodextrin glycosyltransferase-producers in Brazilian biodiversity?
Provedor de dados: 42
Autores: GOMES,ANDREA C.S.M; SANTOS,SAMUEL R. DOS; RIBEIRO,MAYCON C.; CRAVO,PEDRO V.L.; VIEIRA,JOSÉ DANIEL G.; SOUZA,KEILI M.C. DE; AMARAL,ANDRE C.
ABSTRACT In the present work, different Brazilian biomes aiming to identify and select cyclodextrin glycosyltransferase-producer bacteria are explored. This enzyme is responsible for converting starch to cyclodextrin, which are interesting molecules to carry other substances of economic interest applied by textile, pharmaceutical, food, and other industries. Based on the enzymatic index, 12 bacteria were selected and evaluated, considering their capacity to produce the enzyme in culture media containing different starch sources. It was observed that the highest yields were presented by the bacteria when grown in cornstarch. These bacteria were also characterized by sequencing of the 16S rRNA region and were classified as Bacillus, Paenibacillus,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyclodextrin glycosyltransferase; Cyclodextrin; Brazilian biodiversity; Bioprospection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401473

Range distribution and contributions to taxonomy of Elops smithi (ELOPIFORMES: ELOPIDAE)
Provedor de dados: 42
Autores: SOUSA,RODRIGO P.C. DE; SODRÉ,DENISE; COSTA,RAUQUÍRIO M. DA; VALLINOTO,MARCELO; OLIVEIRA,EDIVALDO H.C.; SILVA-OLIVEIRA,GLÁUCIA C.; SAMPAIO,IRACILDA; GUIMARÃES-COSTA,AURYCÉIA.
Abstract: This study presents the first record of Elops smithi for northern Brazil. The evidence suggests this species is being misidentified incorrectly as Elops saurus in estuaries of the Western Atlantic Ocean. Here, morphological, molecular, and cytogenetic ﻿evidence identified all ladyfish specimens from one estuary in the region as E. smithi. ﻿Thus, at least Elops smithi occurs in the northern coast of Brazil and it is recommended that specimens from this region identified as E. saurus be further investigated with genetic and cytogenetic tools in order to assure a correct species identification.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elopidae; Karyotype; Ladyfish; Malacho; Mitochondrial DNA.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700622

Chemical Constituents and Pharmacology properties of Aristolochia triangularis: a south brazilian highly-consumed botanical with multiple bioactivities
Provedor de dados: 42
Autores: OLIVEIRA,SIMONE Q.; KRATZ,JADEL M.; CHAVES,VITOR C.; GUIMARÃES,TATIANA R.; COSTA,DANIELLE T.M.; DIMITRAKOUDI,SAPFO; VONTZALIDOU,ARGYRO; BORDIGNON,SÉRGIO A.L.; SIMIONATO,CESAR P.; STEINDEL,MÁRIO; REGINATTO,FLÁVIO H.; SIMÕES,CLÁUDIA M.O.; SCHENKEL,ELOIR P.
Abstract: Aristolochia triangularis Cham., is one of the most frequently used medicinal plant in Southern Brazil. Preparations containing the leaves and/or stems are traditionally used as anti-inflammatory, diuretic, as well as antidote against snakebites. This study screened A. triangularis extracts, fractions and isolated compounds for different bioactivities. A weak antiproliferative activity against human lung cancer cell line (A549) was observed only for chloroform fraction obtained from stems (CFstems - CC50: 2.93 µg/mL). Also, a moderate antimicrobial activity against Staphylococcus aureus was detected just for chloroform fraction obtained from leaves (CFleaves -13-16 mm inhibition zone). Additionally, two semi-purified fractions (CFstems-4 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aristolochia triangularis; Antiproliferative; Antiherpes; Antimicrobial; Antiprotozoal; Aristolochic acids.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500801

Resistance of Xanthomonas euvesicatoria strains from Brazilian pepper to copper and zinc sulfates
Provedor de dados: 42
Autores: AREAS,MAYSA S.; GONÇALVES,RICARDO M.; SOMAN,JOSÉ M.; SOUZA FILHO,RONALDO C.; GIORIA,RICARDO; SILVA JUNIOR,TADEU A.F. DA; MARINGONI,ANTONIO C.
ABSTRACT Bacterial spot, caused by Xanthomonas spp., is one of the major bacterial diseases in pepper (Capsicum annuum L.). The infection results in reduced crop yield, particularly during periods of high rainfall and temperature, due to the low efficiency of chemical control with copper bactericides. This study evaluated the copper and zinc sulfate sensitivity of 59 pathogenic strains of Xanthomonas euvesicatoria isolated from pepper plants produced in various regions throughout Brazil. Both the respective sulfates and a mixture thereof was evaluated at 50, 100, 200 and 400 μg.mL-1. All the evaluated strains were found to be resistant to zinc sulfate (100 μg.mL-1) and 86.4% were resistant to copper sulfate (200 μg.mL-1). The mixture of copper (200...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial spot; Capsicum annuum; Chemical sensitivity; Control.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502375

Animal-based medicines: biological prospection and the sustainable use of zootherapeutic resources
Provedor de dados: 42
Autores: Costa-Neto,Eraldo M.
Animals have been used as medicinal resources for the treatment and relieve of a myriad of illnesses and diseases in practically every human culture. Although considered by many as superstition, the pertinence of traditional medicine based on animals cannot be denied since they have been methodically tested by pharmaceutical companies as sources of drugs to the modern medical science. The phenomenon of zootherapy represents a strong evidence of the medicinal use of animal resources. Indeed, drug companies and agribusiness firms have been evaluating animals for decades without paying anything to the countries from where these genetic resources are found. The use of animals' body parts as folk medicines is relevant because it implies additional pressure over...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethnozoology; Zootherapy; Bioprospection; Sustainability.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100004

Paleogeographic distribution of Nuculites Conrad, 1841 and Cucullella McCoy, 1851 (Mollusca/Bivalvia)
Provedor de dados: 42
Autores: MACHADO,DEUSANA M.C.; FONSECA,VERA M.M.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200011

Meristematic activity of the Endodermis and the Pericycle in the primary thickening in monocotyledons: considerations on the "PTM"
Provedor de dados: 42
Autores: Menezes,Nanuza L. de; Silva,Delmira C.; Arruda,Rosani C.O.; Melo-de-Pinna,Gladys F.; Cardoso,Vanessa A.; Castro,Neuza M.; Scatena,Vera L.; Scremin-Dias,Edna.
This paper proposes a new interpretation for primary thickening in monocotyledons. The anatomy of the vegetative organs of the following species was examined: Cephalostemon riedelianus (Rapataceae), Cyperus papyrus (Cyperaceae), Lagenocarpus rigidus, L. junciformis (Cyperaceae), Echinodorus paniculatus (Alismataceae) and Zingiber officinale (Zingiberaceae). The endodermis with meristematic activity was observed in the root of all the species, in the stem of Cyperus, Cephalostemum and Lagenocarpus rigidus, and in the leaf trace of Cyperus and leaf of Echinodorus. Considering the continuity of tissues through the root, stem and leaf, the authors conclude that in the stem the pericycle remains active throughout the life of the plant as the generator of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cephalostemon; Cyperus; Echinodorus; Lagenocarpus; Zingiber; Meristematic endodermis; Pericycle; Primary thickening.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200006

Structural analysis of a fragmented area in Minas Gerais State, Brazil
Provedor de dados: 42
Autores: SALOMÃO,NATÁLIA V.; MACHADO,EVANDRO L.M.; PEREIRA,RAFAELLA S.; FERNANDES,GERALDO W.; GONZAGA,ANNE P.D.; MUCIDA,DANIELLE P.; SILVA,LEOVANDES S. DA.
Abstract The theory of landscape ecology applied to the methods of spatial analysis helps to understand changes in the structure of forest remnants. In view of this theory, the objective of the present study was to analyze the structure of a fragmented area between the years 1979 and 2015 through calculation of landscape metrics for arboreal, shrubby and herbaceous vegetation classes. Vegetation classes were classified with visits to the field, interpretation of aerial photographs from 1979 and supervised classification of Landsat 8 from 2015. The metrics calculated for each class were area and total number of fragments, total edge and average connectivity among the fragments. The analysis of structure found that it changed negatively due to an increase in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landscape; Ecology; Tree; Shrub; Herb; Metrics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703353

New tools to study biophysical properties of single molecules and single cells
Provedor de dados: 42
Autores: Rocha,Márcio S.; Mesquita,Oscar N.
We present a review on two new tools to study biophysical properties of single molecules and single cells. A laser incident through a high numerical aperture microscope objective can trap small dielectric particles near the focus. This arrangement is named optical tweezers. This technique has the advantage to permit manipulation of a single individual object. We use optical tweezers to measure the entropic elasticity of a single DNA molecule and its interaction with the drug Psoralen. Optical tweezers are also used to hold a kidney cell MDCK away from the substrate to allow precise volume measurements of this single cell during an osmotic shock. This procedure allows us to obtain information about membrane water permeability and regulatory volume increase....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Optical tweezers; Defocusing microscopy; Single molecules; Macrophages; Water transport; Cell motility.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100003

A note on the occurrence of the encrusting foraminifera Homotrema rubrum in reef sediments from two distinctive hydrodynamic settings
Provedor de dados: 42
Autores: MACHADO,ALTAIR J.; MORAES,SIMONE S.
Sediment samples from two different reef environments were analyzed for their foraminiferal content: the Sioba/Rio do Fogo reefs, located in a broad shallow shelf dominated by strong currents (Rio Grande do Norte State), and the Praia do Forte reefs, located in a narrow shelf under the influence of wind-induced waves (Bahia State). The recorded foraminiferal fauna, from forty-six samples, is represented by 113 species, being the encrusting species Homotrema rubrum present in nine samples from the Sioba/Rio do Fogo reefs and in 11 samples from Praia do Forte reefs. Homotrema fragments recovered from Sioba/Rio do Fogo are mostly polished with rounded edges (51.59%) and some have a whitish color, whereas the specimens from Praia do Forte reefs are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homotrema rubrum; Reefs; Coralline algae; Coral.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400012

Lipolytic response of adipose tissue and metabolic adaptations to long periods of fasting in red tilapia (Oreochromis sp., Teleostei: Cichlidae)
Provedor de dados: 42
Autores: DIAS JUNIOR,WALTER; BAVIERA,AMANDA M.; ZANON,NEUSA M.; GALBAN,VICTOR D.; GARÓFALO,MARIA ANTONIETA R.; MACHADO,CELIO R.; BAILÃO,ELISA F.L.C.; KETTELHUT,ISIS C.
ABSTRACT Adaptive changes of carbohydrate and lipid metabolism induced by 7, 15, 30, 60, 90, 150 and 200 days of fasting were investigated in red tilapia (Oreochromis sp.). Plasma glucose, lactate and free fatty acids (FFA) levels, liver and muscle glycogen and total lipid contents and rates of FFA release from mesenteric adipose tissue (MAT) were measured. Plasma glucose levels showed significant differences only after 90 days of fasting, when glycemia was 34% lower (50±5mg.dL-1) than fed fish values (74±1mg.dL-1), remaining relatively constant until 200 days of fasting. The content of liver glycogen ("15%) in fed tilapia fell 40% in 7 days of food deprivation. In 60, 90 and 150 days of fasting, plasma FFA levels increased 49%, 64% and 90%, respectively,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adipose tissue; Adrenoreceptor; Lipolysis; Liver glycogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501743

Evaluation of Chemical Constituents and Antioxidant Activity of Coconut Water (Cocus nucifera L.) and Caffeic Acid in Cell Culture
Provedor de dados: 42
Autores: SANTOS,JOãO L.A.; BISPO,VANDERSON S.; B.C. FILHO,ADRIANO; PINTO,ISABELLA F.D.; DANTAS,LUCAS S.; VASCONCELOS,DAIANE F.; ABREU,FABíULA F.; MELO,DANILO A.; MATOS,ISAAC A.; FREITAS,FLORêNCIO P.; GOMES,OSMAR F.; MEDEIROS,MARISA H.G.; MATOS,HUMBERTO R.
Coconut water contains several uncharacterized substances and is widely used in the human consumption. In this paper we detected and quantified ascorbic acid and caffeic acid and total phenolics in several varieties of coconut using HPLS-MS-MS (25.8 ± 0.6 µg-mL and 1.078 ± 0.013 µg-mL and 99.7 µg-mL, respectively, in the green dwarf coconut water, or 10 mg and 539 µg and 39.8 mg for units of coconut consumed, 500 ± 50 mL). The antioxidant potential of four coconut varieties (green dwarf, yellow dwarf, red dwarf and yellow Malaysian) was compared with two industrialized coconut waters and the lyophilized water of the green dwarf variety. All varieties were effective in scavenging the DPPH radical (IC50=73 µL) and oxide nitric (0.1 mL with an IP of 29.9%) as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant activity; Ascorbic acid; Caffeic acid; Cocos nucifera; Polyphenols.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401235

Physical characterization of Arabica ground coffee with different roasting degrees
Provedor de dados: 42
Autores: NAKILCIOĞLU-TAŞ,EMINE; ÖTLEŞ,SEMIH.
Abstract: Roasting is a determinative operation on the final quality of coffee. Roasting process causes physical, chemical and sensory changes on coffee. In this study roasting degree effect on physical properties of Arabica fine ground coffee was examined. The bulk properties, particle property, reconstitution properties, moisture content, water activities and color properties were investigated in different roasting degrees of coffee. The results showed that the physical characteristics of coffee samples were influenced by the degree of roast. To have longer shelf life, lower cost and better physical attributes of Arabica fine ground coffee, the roasting process should be kept at a lower degree. At the same time the requests and expectations of customer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arabica coffee; Bulk density; Flowability; Roasting degree; Water content.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300901

Genes and chromosomes: control of development
Provedor de dados: 42
Autores: Serov,Oleg; Serova,Irina.
The past decade has witnessed immense progress in research into the molecular basis behind the developmental regulation of genes. Sets of genes functioning under hierarchical control have been identified, evolutionary conserved systems of genes effecting the cell-to-cell transmission of transmembrane signals and assigned a central role in morphogenesis have been intensively studied; the concept of genomic regulatory networks coordinating expression of many genes has been introduced, to mention some of the major breakthroughs. It should be noted that the temporal and tissue-specific parameters of gene expression are correctly regulated in development only in the context of the chromosome and that they are to a great extent dependent on the position of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epigenetic regulation; Developmental genes; Genetic networks; Variegated position effect; Chromosome territories; Organization of the interphase nucleus.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300007

Thyroid hormone defficiency impairs myelin compaction
Provedor de dados: 42
Autores: FERREIRA,ANDRÉA A.; FREITAS,MARTA S. DE; AZEVEDO,NEIDE L. DE; PEREIRA,MÁRIO J.S.; NAZÁRIO,JOSÉ C.; BARRADAS,PENHA C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300021

Floristic and structural patterns in South Brazilian coastal grasslands
Provedor de dados: 42
Autores: MENEZES,LUCIANA S.; MÜLLER,SANDRA C.; OVERBECK,GERHARD E.
ABSTRACT The natural vegetation of Southern Brazil's coastal region includes grasslands formations that are poorly considered in conservation policy, due to the lack of knowledge about these systems. This study reports results from a regional-scale survey of coastal grasslands vegetation along a 536 km gradient on southern Brazil. We sampled 16 sites along the coastal plain with 15 plots (1 m²) per site. All sites were grazed by cattle. We estimated plant species cover, vegetation height, percentage of bare soil, litter and manure, and classified species according to their growth forms. We found 221 species, 14 of them exotic and two threatened. The prostate grasses: Axonopus aff.affinis, Paspalum notatum and P. pumilumwere among the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pampa biome; Campos; Conservation; Grazing; Sandy soil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502081

Clinical and laboratory aspects of common variable immunodeficiency
Provedor de dados: 42
Autores: Kokron,Cristina M.; Errante,Paolo R.; Barros,Myrthes T.; Baracho,Gisele V.; Camargo,Maristela M.; Kalil,Jorge; Rizzo,Luiz V.
Common variable immunodeficiency (CVID) is an immunological disorder characterized by defective antibody production, recurrent infections, most notably of the respiratory tract, autoimmune phenomena and cancer. Some CVID patients may also present disturbances of the cellular immune response such as a decrease in the number and proportion of different lymphocyte populations, diminished lymphoproliferative response to mitogens and antigens, altered production of cytokines, and deficient expression of cell-surface molecules. Most Brazilian CVID patients included in this study show a decrease in T and B lymphocyte counts in the peripheral blood. Furthermore, their lymphocytes are more susceptible to apoptosis following activation than normal individuals, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Immunodeficiency; Humans; Antibody; Cytokines; Clinical features.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400007

Description of a sauropod dinosaur braincase (Titanosauridae) from the Late Cretaceous Rio Colorado Subgroup, Patagonia
Provedor de dados: 42
Autores: Calvo,Jorge O.; Kellner,Alexander W.
The fossil record of cranial material from titanosaurid sauropods is very poor and no complete skull has been described so far. Here we describe a new braincase (MUCPv-334) that was recovered from reddish sandstones of the Rio Colorado Subgroup (Late Cretaceous) of the region of Bajo del Añelo, approximately 20 km north of the town Añelo (Neuquén Province, Argentina). This specimen is attributed to the Titanosauridae based on the ventrally projected basipterygoid processes, a common condition shared by other titanosaurids. The robustness of MUCPv-334 together with an unusually expanded crista prootica and the presence of an anterior prolongation of the parasphenoid reaching the basal tubera were not reported in other members of the Titanosauridae,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Braincase; Titanosauridae; Late Cretaceous; Patagonia; Argentina.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100015

Synthesis, X-ray diffraction study and pharmacological evaluation of 3-amino-4-methylthiophene-2-acylcarbohydrazones
Provedor de dados: 42
Autores: HERRMANN,SONJA; SCHÜBEL,TABEA; COSTA,FANNY N.; BARBOSA,MARIA LETÍCIA C.; FERREIRA,FABIO F.; DIAS,THAYS L.M.F.; ARAÚJO,MORGANA V.; ALEXANDRE-MOREIRA,MAGNA S.; LIMA,LÍDIA M.; LAUFER,STEFAN; BARREIRO,ELIEZER J.
ABSTRACT N-acylhydrazone is an interesting privileged structure that has been used in the molecular design of a myriad of bioactive compounds. In order to identify new antinociceptive drug candidates, we described herein the design, synthesis, X-ray diffraction study and the pharmacological evaluation of a series of 3-amino-4-methylthiophene-2-acylcarbohydrazone derivatives (8a-t). Compounds were prepared in good overall yields through divergent synthesis from a common key intermediate and were characterized by classical spectroscopy methods. X-ray diffraction study was employed for unequivocal determination of the imine double bond stereochemistry. 8a-t were evaluated in vivo through oral administration using the classical writhing test in mice....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N-acylhydrazone; Privileged structure; Antinociceptive; P38MAPK; X-ray.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301073

Floral biology of Tropaeolum majus L. (Tropaeolaceae) and its relation with Astylus variegatus activity (Germar 1824) (Coleoptera: Melyridae)
Provedor de dados: 42
Autores: Silva,Maria Emilia P.F.; Mussury,Rosilda M.; Vieira,Maria do Carmo; Alves Junior,Valter V.; Pereira,Zefa V.; Scalon,Silvana P.Q.
Tropaeolum majus L. (nasturtium) is a culture popularly known by its medicinal, ornamental and culinary utility. This work aimed to evaluate the interaction between Astylus variegatus (Germar 1824) (Coleoptera: Melyridae) and the nasturtium flowers associated to the weeks of flourishing, in order to conceive the floral mechanims used by the species to attract A. variegatus. The insects collection was achieved with an entomologic net by the sweeping method, during the weekly flowering, at two hours, from 7am to 5pm. The studies of floral biology were carried out in twenty flowers by the analysis of measures and the arrangement of the floral parts. The nasturtium flower offers pollen and nectar to the insect as a compensation. However, it was observed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nasturtium; Coleoptera; Pollinization.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400012

Relevance of Hydrodynamic Effects for the Calculation of Outer Surface Potential of Biological Membrane Using Electrophoretic Data
Provedor de dados: 42
Autores: SILVA JUNIOR,IZAN M.; CASTRO,MARIA CLÍCIA S.; SILVA,DILSON; CORTEZ,CÉLIA M.
ABSTRACT In this paper, we present the results of a study on the influence of hydrodynamic effects on the surface potentials of the erythrocyte membrane, comparing two different models formulated to simulate the electrophoretic movement of a biological cell: the classical Helmholtz-Smoluchowski model and a model presented by Hsu et al. (1996). This model considers hydrodynamic effects to describe the distribution of the fluid velocity. The electric potential equation was obtained from the non-linear Poisson-Boltzmann equation, considering the spatial distribution of electrical charges fixed in glycocalyx and cytoplasmic proteins, as well as electrolyte charges and ones fixed on the surfaces of lipidic bilayer. Our results show that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Electric potential profile; Erythrocyte membrane; Electrophoretic mobility; Glycocalyx; Hydrodynamic effects.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300751

Conservation of geosites as a tool to protect geoheritage: the inventory of Ceará Central Domain, Borborema Province - NE/Brazil
Provedor de dados: 42
Autores: MOURA,PÂMELLA; GARCIA,MARIA DA GLÓRIA M.; BRILHA,JOSÉ B.; AMARAL,WAGNER S.
ABSTRACT The Ceará Central Domain, in the northern Borborema Province/NE Brazil, encompasses important geological records (geosites) which allow understanding a relevant period of the Earth’s evolution, mainly associated to Neoproterozoic Brazilian/Pan-African Cycle and West Gondwana amalgamation, besides Neoarchean to Ordovician records. The presented geoheritage inventory aims to characterise the geosites with scientific relevance of Ceará Central Domain. By applying a method for large areas, the final selection resulted in eight geological frameworks represented by 52 geosites documented in a single database. This is the first step for a geoconservation strategy based on systematic inventories, statutory protection, geoethical behaviour and awareness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geological heritage; Geoconservation; Inventory; Borborema Province; Brazil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602625

Effect of l-glutamine on myenteric neuron and of the mucous of the ileum of diabetic rats
Provedor de dados: 42
Autores: TRONCHINI,ELEANDRO A.; TREVIZAN,ALINE R.; TASHIMA,CRISTIANO M.; FREITAS,PRISCILA DE; BAZOTTE,ROBERTO B.; PEREIRA,MARLI A.S.; ZANONI,JACQUELINE N.
The objective of this work was to investigate the effect of the L-glutamine supplementation to prevent - diabetes induced changes in myenteric neurons and also to verify the effect on the mucosa of the ileum of Wistar rats. The animals were divided in five groups (n = 5): untreated normoglycaemic (UN), normoglycaemic treated with L-glutamine (NG), untreated diabetics (UD), diabetics treated with L-glutamine, starting on the 4th (DG4) or 45thday following diabetes induction (DG45). The amino acid was added to the diet at 1%. The density and size of neurons, the metaphasic index in the crypt, the height of the villus, the depth of the crypt and the number of globet cells were determined. There was no difference in the neuronal density and in the cellular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabetes mellitus; L-glutamine; Myenteric plexus; Myosin-V; Rats.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301165

On simple Shamsuddin derivations in two variables
Provedor de dados: 42
Autores: BALTAZAR,RENE.
Abstract We study the subgroup of   k-automorphisms of    k ⁢  [ x , y ] which commute with a simple derivation   d of    k ⁢  [ x , y ]. We prove, for instance, that this subgroup is trivial when   d is a shamsuddin simple derivation. in the general case of simple derivations, we obtain properties for the elements of this subgroup.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dynamical degree; Isotropy group; Shamsuddin derivations; Simple derivations.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602031

Weak convergence under nonlinearities
Provedor de dados: 42
Autores: MOREIRA,DIEGO R.; TEIXEIRA,EDUARDO V. O.
In this paper, we prove that if a Nemytskii operator maps Lp(omega, E) into Lq(omega, F), for p, q greater than 1, E, F separable Banach spaces and F reflexive, then a sequence that converge weakly and a.e. is sent to a weakly convergent sequence. We give a counterexample proving that if q = 1 and p is greater than 1 we may not have weak sequential continuity of such operator. However, we prove that if p = q = 1, then a weakly convergent sequence that converges a.e. is mapped into a weakly convergent sequence by a Nemytskii operator. We show an application of the weak continuity of the Nemytskii operators by solving a nonlinear functional equation on W1,p(omega), providing the weak continuity of some kind of resolvent operator associated to it and getting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weak continuity; Nonlinearities; Nemytskii operator.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100002

Surface, thermal and hemocompatible properties of novel single stage electrospun nanocomposites comprising polyurethane blended with bio oilTM
Provedor de dados: 42
Autores: AYYAR,MANIKANDAN; MANI,MOHAN PRASATH; JAGANATHAN,SARAVANA KUMAR; RATHINASAMY,RAJASEKAR; KHUDZARI,AHMAD ZAHRAN; KRISHNASAMY,NAVANEETHA PANDIYARAJ.
ABSTRACT In this work, the physicochemical and blood compatibility properties of prepared PU/Bio oil nanocomposites were investigated. Scanning electron microscope (SEM) studies revealed the reduction of mean fiber diameter (709 ± 211 nm) compared to the pristine PU (969 nm ± 217 nm). Fourier transform infrared spectroscopy (FTIR) analysis exposed the characteristic peaks of pristine PU. Composite peak intensities were decreased insinuating the interaction of the bio oilTM with the PU. Contact angle analysis portrayed the hydrophobic nature of the fabricated patch compared to pristine PU. Thermal gravimetric analysis (TGA) depicted the better thermal stability of the novel nanocomposite patch and its different thermal behavior in contrast with the pristine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Bio oilTM; Nanocomposite; Atomic force microscopy; Wound healing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502411

Some considerations about the ecology of Triatominae
Provedor de dados: 42
Autores: Noireau,François; Carbajal-de-la-Fuente,Ana L.; Lopes,Catarina M.; Diotaiuti,Lileia.
Observations on the ecology of silvatic Triatominae are still fragmentary, principally because target species in control process are almost exclusively domestic. Report of silvatic species invading human dwellings must lead research to be focused on their original ecology, in order to assist in understanding their process of domestication and devising strategies for surveillance.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chagas disease; Triatominae; Silvatic environment; Ecology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300006

Molecular and cytogenetic assessment of Dipterygium glaucum genotoxicity
Provedor de dados: 42
Autores: ALTWATY,NADA H.; EL-SAYED,OSAMA E.; ALY,NARIMAN A.H.; BAESHEN,MOHAMED N.; BAESHEN,NABIH A.
ABSTRACT The aim of the present study is to assess the genotoxicity of Dipterygium glaucum grows widely in Saudi Arabia desert to produce safety herbal products. This work is considered the first and pioneer report so far due to the lack and poor evaluated reports of the plant species for their mutagensity, genotoxicity and cytogenetics effects. Cytogenetic effects of D. glaucum on mitotic in roots of Vicia faba showed reduction in mitotic activity using three extracts; water, ethanol and ethyl acetate. Chromosomal abnormalities were recorded that included stickiness of chromosomes, chromatin bridge, fragments, lagging chromosome and micronuclei. Protein bands and RAPD analyses of V. faba treated with three D. glaucum extracts revealed some newly induced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dipterygium glaucum; Three plant extracts; Cytogenetic on mitotic roots of Vicia faba; Protein and RAPD analyses.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200623

Tree community variation in a tropical continental island according to slope aspect and human interference
Provedor de dados: 42
Autores: GONÇALVES,NATHAN B.; NETTESHEIM,FELIPE C.; CONDE,MARILENA M.S.
ABSTRACT Associating description of unrecorded tropical tree community structure to sampling approaches that can help determine mechanisms behind floristic variation is important to further the comprehension of how plant species coexist at tropical forests. Thus, this study had the goals of (i) evaluating tree community structure on the continental island of Marambaia (23°4’37.09”S; 43°59’2.15”W) and (ii) testing the prediction that there are local scale changes in a tropical tree community structure between slopes facing different geographic orientation and with distinct human interference history. We established 60 (0.6 ha) sampling units in three different slope sites with distinct predominant geographic orientation and human interference. We sampled...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthropic impacts; Atlantic Rainforest; Plant diversity; Floristic variation; Topography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100017

Bark Harvesting Systems of Drimys brasiliensis Miers in the Brazilian Atlantic Rainforest
Provedor de dados: 42
Autores: MARIOT,ALEXANDRE; MANTOVANI,ADELAR; REIS,MAURÍCIO S. DOS.
Drimys brasiliensis Miers, locally known as cataia or casca-de-anta, is a native tree species of the Atlantic Rainforest. Its bark is harvested from natural populations. This study examined the recovery capacity of the bark of D. brasiliensis under different bark harvesting methods, as well as the influence of these approaches on its population dynamics and reproductive biology. While none of these treatments resulted in changes in phenological behavior or the rate of increase of diameter at breast height and tree height, the removal of wider bark strips resulted in lower rates of bark recovery and higher rates of insect attack and diseases. Accordingly, the results recommend using strips of bark 2 cm wide and 2 m long, with 4 cm between strips, for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bark harvesting; Medicinal plant; Sustainable management; Drimys brasiliensis; Insect attack.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301315

The relationship between sandy beach nematodes and environmental characteristics in two Brazilian sandy beaches (Guanabara Bay, Rio de Janeiro)
Provedor de dados: 42
Autores: MARIA,TATIANA F.; PAIVA,PAULO; VANREUSEL,ANN; ESTEVES,ANDRÉ M.
We investigated if the differences in density and nematode communities of intertidal sediments from two Brazilian sheltered sandy beaches were related to environmental characteristics. The upper tide level (UTL) and the low tide level (LTL) of both beaches were surveyed in January (austral summer) and June 2001 (austral winter) during low-spring tides, by collecting samples of nematodes and sediments. Differences in density between beaches, tidal level and seasons, and nematode community structure were investigated. Sediments from both beaches were composed of medium to very coarse sand. The highest nematode densities were found at the UTL, and significant differences between beaches, tidal levels and months were found. A total of 54 genera were found and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Free-living marine nematodes; Hydrodynamic; Granulometry; Sandy beach.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100257

Flood regime and water table determines tree distribution in a forest-savanna gradient in the Brazilian Pantanal
Provedor de dados: 42
Autores: FERREIRA-JÚNIOR,WALNIR G.; SCHAEFER,CARLOS E.G.R.; CUNHA,CÁTIA N.; DUARTE,TEMILZE G.; CHIEREGATTO,LUIZ C.; CARMO,FLÁVIA M.S.
ABSTRACT This study aimed to recognized the preferential location of species of the tree sinusiae in response to a moisture gradient in Pantanal Matogrossense, Brazil. We established sampling plots of arboreal sinusiae along a soil moisture and flood gradient. Piezometers were installed, allowing monthly measurements of water table depth and flood height during one year. Detrended Correspondence Analysis, Gradient Direct Analysis, Multi-response Permutation Procedures and Indicator Species Analysis were performed to evaluate the effect of moisture gradient on tree distribution. The annual variation of water table is shallower and similar in Seasonally Flooded Forest and Termite Savanna, with increasing depths in Open Savanna, Savanna Forest and Dry Forest....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floristic composition; Flood pulse concept; Wetlands; RPPN SESC Pantanal.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200719

Forage potential of native ecotypes of Paspalum notatum and P. guenoarum
Provedor de dados: 42
Autores: STEINER,MARCELO G.; DALL’AGNOL,MIGUEL; NABINGER,CARLOS; SCHEFFER-BASSO,SIMONE M.; WEILER,ROBERTO L.; SIMIONI,CARINE; SCHIFINO-WITTMANN,MARIA TERESA; MOTTA,ÉDER A.M. DA.
ABSTRACT The Paspalum genus includes several species that are important for livestock in Rio Grande do Sul, such as P. notatum and P. guenoarum, typical of native pastures of the Pampa biome. The aim of this study was to investigate forage production and chemical composition of four ecotypes of these species in relation to the cv. ‘Pensacola’ (P. notatum). Ecotypes of P. guenoarum (Azulão and Baio) and P. notatum (André da Rocha and Bagual) and the cv. ‘Pensacola’ were evaluated for two years, during which four cuts/year were made. The work was carried out under field conditions at the Agronomic Experimental Station of the Federal University of Rio Grande do Sul (30°05’S; 51°39’W), in a completely randomized design. P. guenoarum stood out for higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Fiber; Forage production dry matter; Crude protein.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401753

Risk analysis in the spillway of dam Orós by excess of influent flow
Provedor de dados: 42
Autores: Goes Filho,Adbeel.
This paper presents the practical application of concepts, and some methods of risk analysis, to check the possibility of overcoming a water level of project in the spillway of dam Orós, by excess of influent flow. Also evaluated the empirical formulas contained in the original design. Due to the difficulty of obtaining design data from the dam, since the end of construction date of January, 11, 1961, we minimize the effects of some variables in the calculations, leading us to the consequent simplification of the scenario under study. For a better evaluation and characterization of the setting, some variables in the model such as water level, accumulation and flow of the spillway, had updated their data to June 28, 2011. We have demonstrated the importance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Risk analysis; Public dams; Reservoirs; Water resources management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100405

Viruses infecting cool season crops in the northern Turkey
Provedor de dados: 42
Autores: SEVIK,MEHMET A.
Abstract:Virus diseases of cool season vegetable crops (mainly cabbage, white and red head cabbage, broccoli, kale, radish, rocket salad, garden cress, and turnip) were surveyed in Bafra Plain, Turkey during winter 2017, and 2018. Leaf samples were collected from different species of the Brassicaceae family showing mosaic, mottling, necrotic spots, malformation, and chlorosis symptoms. These samples were tested for the presence of Cauliflower mosaic virus (CaMV), Cucumber mosaic virus (CMV), Beet western yellows virus (BWYV), Radish mosaic virus (RaMV), Turnip mosaic virus (TuMV), Turnip yellow mosaic virus (TYMV), and Turnip yellows virus (TuYV) by biological and serological methods. A total of 455 samples were collected from cole crop fields and tested...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassicaceae family; Cole crop; Plant disease; Occurrence; Virus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500853

Subclinical Diabetes
Provedor de dados: 42
Autores: LIMA,LUÍS M.T.R.
ABSTRACT Type 2 diabetes mellitus (T2DM) is increasing in prevalence worldwide, and those non-diagnosed or misdiagnosed comprise a significant group compared to those diagnosed. Accumulated scientific evidence indicate that the current diagnostic markers (fasting glycemia, 2h glycemia after an oral glucose load and HbA1c) are indeed late diagnostic criteria when considering the incidence of diabetes-related complications and comorbidities, which are also at high risk in some groups among normoglycemic individuals. Additionally, the earlier identification of future risk of diabetes is desirable since it would allow better adherence to preventive actions such as lifestyle intervention, ultimately avoiding complications and minimizing the economic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabetes; Diagnosis; Insulin; Subclinical diabetes; Metabolic syndrome.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200591

Surfaces in E³ invariant under a one parameter group of isometries of E³
Provedor de dados: 42
Autores: ROUSSOS,IOANNIS M.
We develop a convenient surface theory in E³ in order to apply it to the class of the surfaces invariant under a one-parameter group of isometries of E³. In this way we derive intrinsic characterizations along with several results of subclasses of this class of surfaces that satisfy certain preassigned properties. In the process all results are also effortlessly derived. Among these subclasses are those with surfaces; of constant mean curvature, of constant Gaussian curvature, isothermic, with constant difference or ratio of the principal curvatures.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invariant; Parameter; Group; Isometry; Mean; Gaussian; Principal; Curvature.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200003

A metric property of umbilic points
Provedor de dados: 42
Autores: Garcia,Ronaldo; Sotomayor,Jorge.
In the space of cubic forms of surfaces, regarded as a G-space and endowed with a natural invariant metric, the ratio of umbilic points with a negative index to those with a positive index is evaluated in terms of the asymmetry of the metric, defined here. This work contains also a section with references pertinent to umbilic points and one with a discussion of a connection of the above defined ratio with that reported in 1977 by Berry and Hannay in the domain of Statistical Physics.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Umbilic point; Principal curvature lines.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400001

Ostracodes from the Rio da Batateira Formation (Lower Cretaceous, Araripe Basin): preliminary results on systematics, biostratigraphy and paleoecology
Provedor de dados: 42
Autores: SYRIO,VANESSA N.; RIOS-NETTO,ARISTÓTELES M.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200026

Tryblionella persuadens comb. nov.(Bacillariaceae, Diatomeae): new observations on frustule morphology of a seldom recorded diatom
Provedor de dados: 42
Autores: CAVALCANTE,KAOLI P.; TREMARIN,PRISCILA I.; FREIRE,EDUARDO G.; LUDWIG,THELMA A.V.
ABSTRACTThe species originally described from brackish waters of the Venetian Lagoon asNitzschia persuadens is a diatom rarely cited in the literature since its proposition and it is here recorded for the first time in a freshwater environment in South America. Morphological features of this species, such valve slightly panduriform, with a longitudinal straight fold of the valve face, poroidal areolae, and strongly eccentric raphe system clearly assign this species to Tryblionella, and the transfer was made. Here we present new observations on the frustule morphology and comparisons with related species. Light and scanning electron microscopy data of Tryblionella persuadens comb. nov. from Cachoeira River, Northeastern Brazil are documented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillariophyceae; Brazil; Coastal river; Nitzschia persuadens.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401419

Nutrient budgets (C, N and P) and trophic dynamicsof a Brazilian tropical estuary: Barra das Jangadas
Provedor de dados: 42
Autores: Noriega,Carlos E. D; Araujo,Moacyr.
This paper focuses on the nutrient dynamics of a tropical estuary on the northeastern Brazilian coast, studied using the LOICZ biogeochemical budgeting protocol. We describe the methodology and assumptions underlying this model. Input data (monthly for rainfall, evaporation, river discharge, and concentrations of salt, phosphorus and nitrogen) were obtained during field campaigns in the Barra das Jangadas Estuary (BJE) over a 5 years period (1999 to 2003). Mass balance results indicate large inputs of nutrients to the system. The model shows that the seasonal variation of the Net Ecosystem Metabolism (NEM) indicates that the system passes from a stage of organic matter liquid production and mineralization during the dry season (-0.5 mmoles C m-2 d-1) to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Barra das Jangadas Estuary; Seasonal variations; Heterotrophy; Autotrophy; Carbon dioxide.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200007

State estimation and optimal long period clinical treatment of HIV seropositive patients
Provedor de dados: 42
Autores: Grégio,Juliana M.; Caetano,Marco A.L.; Yoneyama,Takashi.
Optimal control theory provides a very interesting quantitative method that can be used to assist the decision making process in several areas of application, such as engineering, biology, economics and sociology. The main idea is to determine the values of the manipulated variables, such as drug doses, so that some cost function is minimized, subject to physical constraints. In this work, the cost function reflects the number of CD4+T cells, viral particles and the drug doses. It is worth noticing that high drug doses are related to more intense side-effects, apart from the impact on the actual cost of the treatment. In a previous paper by the authors, the LQR - Linear Quadratic Regulator approach was proposed for the computation of long period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AIDS; Filtering; Drugs; Mathematical modeling; Optimization.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100002

Persistent Mullerian duct Syndrome in a Brazilian miniature schnauzer dog
Provedor de dados: 42
Autores: NOGUEIRA,DENISE M.; ARMADA,JORGE L.A.; PENEDO,DIEGO M.; TANNOUZ,VANIA G.S.; MEYERS-WALLEN,VICKI N.
Abstract: Here we describe an eight-year-old miniature schnauzer (MS) dog from Brazil with Persistent Mullerian Duct Syndrome (PMDS) and the single base pair substitution in AMHR2 exon 3, first detected in this breed in the USA. This finding is evidence of mutation dissemination to South America. In PMDS, a type of XY Disorder of Sex Development (DSD), dogs with a male karyotype and external phenotype also have a uterus, oviducts, and a cranial vagina internally. Approximately half of PMDS MS are unilaterally or bilaterally cryptorchid and many develop pyometra and/or Sertoli cell tumor. Bilateral Sertoli cell testicular tumors were present in this case, and the dog died a few days after surgical castration and hysterectomy. Although the karyotype was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 78; XY Disorders of Sex Development; AMHR2 exon 3 mutation; Canine; PMDS.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300712

Effects of Tityus stigmurus (Thorell 1876) (Scorpiones: Buthidae) venom in isolated perfused rat kidneys
Provedor de dados: 42
Autores: SILVA,NATHALIA A.; ALBUQUERQUE,CLEIDE M.R.; MARINHO,ALINE D.; JORGE,ROBERTA J.B.; SILVA NETO,ANTONIO G.; MONTEIRO,HELENA S.A.; SILVA,TÚLIO D.; SILVA,MÁRCIA V.; CORREIA,MARIA TEREZA S.; PEREIRA,TICIANA P.; MARTINS,ALICE M.C.; MENEZES,DALGIMAR B.; XIMENES,RAFAEL M.; MARTINS,RENÉ D.
ABSTRACT Scorpions belonging to the Tityus genus are of medical interest in Brazil. Among them, Tityus stigmurus is the main scorpion responsible for stings in the Northeast region. After a sting, the scorpion venom distributes rapidly to the organs, reaching the kidneys quickly. However, there are few studies concerning the renal pathophysiology of scorpion poisoning. In this study, we evaluated the effects of T. stigmurus venom (TsV) on renal parameters in isolated rat kidneys. Wistar rats (n = 6), weighing 250-300 g, were perfused with Krebs-Henseleit solution containing 6 g/100 mL bovine serum albumin. TsV at 0.3 and 1.0 μg/mL was tested, and the effects on perfusion pressure (PP), renal vascular resistance (RVR), urinary flow (UF), glomerular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2D-PAGE; Kidney; MDCK; Venom; Tityus stigmurus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200665

A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil
Provedor de dados: 42
Autores: Dillenburg,Sérgio R.; Esteves,Luciana S.; Tomazelli,Luiz J.
Evidences of coastal erosion in Rio Grande do Sul have been obtained by three methods: (a) analysis of the long-term morphodynamics and stratigraphy of coastal barriers, (b) annual shoreline mapping using the Differential Global Positioning System (DGPS), and (c) local beach profile measurements. The first method reflects coastal erosion as continuity of the geological evolution in the last 5 ka, taking place mainly along the southern half of gentle coastal projections. The second method represents a shorter temporal scale and indicates that approximately 80% of the coast is eroding. Beach profiling has been measured in very few places that are distant from each other since the early 1990s; consequently, their results reflect local and very short time...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal evolution; Quaternary; Shoreline changes; Coastal barriers; Sediment budget.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300014

A study of the dry forest communities in the Dominican Republic
Provedor de dados: 42
Autores: García-Fuentes,Antonio; Torres-Cordero,Juan A.; Ruiz-Valenzuela,Luis; Lendínez-Barriga,María Lucía; Quesada-Rincón,Juan; Valle-Tendero,Francisco; Veloz,Alberto; León,Yolanda M.; Salazar-Mendías,Carlos.
This paper is a floristic and phytosociological study of the dry forest communities of the Dominican Republic. A total of 69 relevés in dry forest biotopes were carried out. The samples were subsequently subjected to Detrended Correspondence Analysis for the determination and study of possible groupings. The study does not cover tree formations growing on serpentines, nor the so-called semideciduous forests, peculiar to areas with higher rainfall. A total of nine phytocoenoses were identified. The most significant results led to the description of six new phytosociological associations: Simaroubetum berteroani(thorny dry forest on coastal dunes), Phyllostylo rhamnoidis-Prosopidetum juliflorae (southern Dominican disturbed dry forest), Consoleo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caribbean; Endemism; Multivariate analysis; Phytosociology; Xericity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100249

Bioactivities of the ethanol extract from Ageratum fastigiatum branches: antioxidant, antinociceptive and anti-inflammatory
Provedor de dados: 42
Autores: DEL-VECHIO-VIEIRA,GLAUCIEMAR; SANTOS,BRUNA C.S.; ALVES,MARIA SILVANA; ARAÚJO,AÍLSON L.A.; YAMAMOTO,CÉLIA H.; PINTO,MÍRIAM A.O.; KAPLAN,MARIA AUXILIADORA C.; SOUSA,ORLANDO V.
ABSTRACT The present study was designed to investigate the antioxidant, antinociceptive and anti-inflammatory activities of the ethanol extract from Ageratum fastigiatum branches. Phytochemical screening and total phenol and flavonoid contents were determined. The antioxidant activity was assessed by 2,2-diphenyl-1-pycrilhydrazin (DPPH) and iron reducing power methods. The antinociceptive effect was evaluated using the acetic acid-induced writhing, formalin, hot plate and tail immersion assays; while the carrageenan-induced paw edema and pleurisy tests were performed to examine the anti-inflammatory activity against acute inflammation. The extract revealed the presence of flavonoids, tannins, coumarins, terpenes, sterols and saponins. Expressive levels of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ageratum fastigiatum; Analgesic; Anti-inflammatory; Antioxidant; Flavonoids; Total phenols.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401471

Evaluation of an inexpensive needle test for the diagnosis of phosphorus deficiency and management of phosphorus supplementation for cattle: A multiple case study
Provedor de dados: 42
Autores: MALAFAIA,PEDRO; GARCIA,FELIPE Z.; LOPES,SAMARA P.; SOUZA,VINÍCIUS C.; CANELLA FILHO,CAMILLO F.C.; COSTA,DIOGO F.A.; VEIGA,CRISTIANO C.P.
ABSTRACT The needle test (NT) is a point-of-care test developed in Brazil to evaluate the Phosphorus (P) status in cattle. Based on bone resistance, the NT is a very inexpensive method which allows the diagnosis of any degree of P deficiency in a fast and simple way in vivo and directly on farm. The NT measures three levels of resistance in the transverse process (TP) of the lumbar vertebrae: a) TP that are impenetrable and result in warping of the needle (P healthy animals); b) TP offering some resistance to the penetration (animals with subclinical P deficiency); and c) TP which has minimal resistance to penetration (clinical P deficiency). This manuscript presents results from a series of case studies to evaluate the hypothesis that the NT could be used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef and dairy cattle; Phosphorus; Mineral deficiency; Mineral supplementation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703337

Growth and production of volatile compounds of yarrow (Achillea millefolium L.) under different irrigation depths
Provedor de dados: 42
Autores: ALVARENGA,IVAN C.A.; PACHECO,FERNANDA V.; ALVARENGA,AMAURI A.; BERTOLUCCI,SUZAN K.V.; PINTO,JOSÉ EDUARDO B.P.
Abstract Yarrow (Achillea millefolium L., Asteraceae) is an important medicinal plant used worldwide for its medicinal properties such as the analgesic, antioxidant and anti-inflammatory ones. The aim of this study was to evaluate the growth and production of photosynthetic pigments and of volatile constituents of Achillea millefolium L. under different irrigation depths. The treatments were the application of 55, 110, 220, 440 and 880 mm of water for a period of 110 days. Data were submitted to polynomial regression analysis at 5% probability, while the volatile constituents were analyzed by standard deviation. Different irrigation depths provided quadratic growth responses being the highest dry matter production at the depth of 440 mm. The contents of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; 1; 8 cineol; Chlorophyll; Terpenes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703901

Perception of local inhabitants regarding the socioeconomic impact of tourism focused on provisioning wild dolphins in Novo Airão, Central Amazon, Brazil
Provedor de dados: 42
Autores: ALVES,LUIZ C.P.S.; ZAPPES,CAMILAH A.; OLIVEIRA,RAFAEL G.; ANDRIOLO,ARTUR; AZEVEDO,ALEXANDRE DE F.
Botos (Inia geoffrensis) are currently provisioned for use in tourist attractions in five sites in the Brazilian Amazon. Despite the known negative effects associated with human-wild dolphin interactions, this activity has been regulated and licensed in the Anavilhanas National Park in Novo Airão, Amazonas State, Brazil. We present an updated evaluation of the perception of the local community concerning the possible socioeconomic impacts of this tourism in Novo Airão. In April 2011, 45 interviews were conducted with inhabitants. A small segment of Novo Airão perceives currently itself as being economically dependent on the botos feeding tourism. Despite that, the economic benefits of this controversial activity apparently are not shared among most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Anavilhanas National Park; Artificial feeding; Boto; Inia geoffrensis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401577

Time course of echocardiographic and electrocardiographic parameters in myocardial infarct in rats
Provedor de dados: 42
Autores: Miranda,Amarildo; Costa-e-Sousa,Ricardo H.; Werneck-de-Castro,João P.S.; Mattos,Elisabete C.; Olivares,Emerson L.; Ribeiro,Vanessa P.; Silva,Márcia G.; Goldenberg,Regina C.S.; Campos-de-Carvalho,Antônio C.
In animal models the evaluation of myocardial infarct size in vivo and its relation to the actual lesion found post mortem is still a challenge. The purpose of the current study was to address if the conventional electrocardiogram (ECG) and/or echocardiogram (ECHO) could be used to adequately predict the size of the infarct in rats. Wistar rats were infarcted by left coronary ligation and then ECG, ECHO and histopathology were performed at 1, 7 and 28 days after surgery. Correlation between infarct size by histology and Q wave amplitude in lead L1 was only found when ECGs were performed one day post-surgery. Left ventricular diastolic and systolic dimensions correlated with infarct size by ECHO on day 7 post-infarction. On days 7 and 28 post-infarction,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myocardial infarction; Rats; Electrocardiogram; Echocardiogram; Infarct size.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400006

Linking environmental drivers with amphibian species diversity in ponds from subtropical grasslands
Provedor de dados: 42
Autores: GONÇALVES,DARLENE S.; CRIVELLARI,LUCAS B.; CONTE,CARLOS EDUARDO.
ABSTRACTAmphibian distribution patterns are known to be influenced by habitat diversity at breeding sites. Thus, breeding sites variability and how such variability influences anuran diversity is important. Here, we examine which characteristics at breeding sites are most influential on anuran diversity in grasslands associated with Araucaria forest, southern Brazil, especially in places at risk due to anthropic activities. We evaluate the associations between habitat heterogeneity and anuran species diversity in nine body of water from September 2008 to March 2010, in 12 field campaigns in which 16 species of anurans were found. Of the seven habitat descriptors we examined, water depth, pond surface area and distance to the nearest forest fragment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Environmental variables; Generalized linear models; Hierarchical partitioning.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401751

Evidence of separate karyotype evolutionary pathway in Euglossa orchid bees by cytogenetic analyses
Provedor de dados: 42
Autores: FERNANDES,ANDERSON; WERNECK,HUGO A.; POMPOLO,SILVIA G.; LOPES,DENILCE M.
Euglossini are solitary bees considered important pollinators of many orchid species. Information regarding chromosome organization is available for only a small number of species in this group. In the present work, the species Euglossa townsendi and E. carolina were analyzed by cytogenetic techniques to collect information that may aid the understanding of their evolution and chromosomal organization. The chromosome number found was n = 21 for males and 2n = 42 for females in the two species. The distribution and amount of heterochromatin regions differed in the two species analyzed, where they were classified as “high” or “low” heterochromatin content, similarly to what has already been performed in social bee species of the genus Melipona. Banding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; Euglossini; Heterochromatin; Karyotypic evolution.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300937

Helminth parasites of Cichla ocellaris Bloch &amp;amp; Schneider, 1801 collected in the Jacaré-Pepira River, São Paulo state, Brazil
Provedor de dados: 42
Autores: JANUÁRIO,FELIPE F.; GIÃO,THAYANA; AZEVEDO,RODNEY K. DE; ABDALLAH,VANESSA D.
Abstract:Cichla ocellaris is native to the Amazon region. It is popularly known as tucunaré and is widely used for human consumption. It is difficult to breed in captivity due to its highly predatory habits, it is considered symbolic of sport fishing in Brazil. This study aimed to make a qualitative and quantitative survey of helminth parasites of C. ocellaris. Thirty specimens from the Jacaré-Pepira River, located in the municipality of Ibitinga, in the interior of the state of São Paulo, were studied. The river is located 13 km from the urban area and at an altitude of approximately 600 m. A total of four taxa of metazoan parasites were collected and identified in Cestoda, Digenea, Monogenea and Nematoda. The cestoid Proteocephalus macrophallus presented...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Parasitic fauna; Tucunaré; Fish parasites.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300608

Ecology of the non-native snail Sinotaia cf quadrata (Caenogastropoda: Viviparidae). A study in a lowland stream of South America with different water qualities
Provedor de dados: 42
Autores: FERREIRA,ANA CLARA; PAZ,ESTEFANÍA L.; RUMI,ALEJANDRA; OCON,CAROLINA; ALTIERI,PAULA; CAPÍTULO,ALBERTO RODRIGUES.
ABSTRACT Sinotaia quadrata is a snail native from Asia recorded for the first time in South America in 2009 in central Argentina. In 2015, this species was also found in a lowland stream with different water qualities. Our aims were to contribute to the knowledge of its population ecology and to compare the individuals from the two locations anatomically. Snails were searched at 6 sites, where physicochemical and hydraulic parameters were measured. Biological samples were also taken at two sites (S3 and S4) to study the population traits of S. cf quadrata (density, size structure, fecundity and sex ratio) and to assess the water quality through macroinvertebrates' biological indices (richness, diversity and IBPamp). Physicochemical and biological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alien species; Life history traits; Lowland streams; Tolerance; Water quality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301059

Ameliorative potential of Ocimum sanctum in chronic constriction injury-induced neuropathic pain in rats
Provedor de dados: 42
Autores: KAUR,GURPREET; BALI,ANJANA; SINGH,NIRMAL; JAGGI,AMTESHWAR S.
The present study was designed to investigate the ameliorative potential of Ocimumsanctum and its saponin rich fraction in chronic constriction injury-induced neuropathic pain in rats. The chronic constriction injury was induced by placing four loose ligatures around the sciatic nerve, proximal to its trifurcation. The mechanical hyperalgesia, cold allodynia, paw heat hyperalgesia and cold tail hyperalgesia were assessed by performing the pinprick, acetone, hot plate and cold tail immersion tests, respectively. Biochemically, the tissue thio-barbituric acid reactive species, super-oxide anion content (markers of oxidative stress) and total calcium levels were measured. Chronic constriction injury was associated with the development of mechanical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chronic constriction injury; Ocimum sanctum; Saponin rich fraction; Calcium; Oxidative stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100417

Fatty acids composition in seeds of the South American glasswort Sarcocornia ambigua
Provedor de dados: 42
Autores: D'oca,Marcelo G.M.; Morón-Villarreyes,Joaquín A.; Lemões,Juliana S.; Costa,César S.B.
Sarcocornia ambigua (Michx.) M.A. Alonso &amp;amp; M.B. Crespo is the most widely distributed species of the perennial genus of glasswort in South America, and it shows great biotechnological potential as a salt-water irrigated crop. Qualitative and quantitative compositions of fatty acids were determined in the seeds of S. ambigua that were cultivated in southern Brazil. Hexane extraction of the seed oil from S. ambigua yielded 13% of total lipids. The GC-FID (Gas Chromatography Flame Ionization Detector) analysis of the hexane extracts showed five prominent peaks for the seed oil: 42.9 wt.% linoleic-Ω6 acid (18:2), 20.4 wt.% palmitic acid (16:0), 18.5 wt.% oleic acid (18:1), 4.5 wt.% stearic acid (18:0) and 4.0 wt.% linolenic-Ω3 acid (18:3). The sum of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sarcocornia; Seed; Perennial crop; Saline water; Biodiesel; Palmitic acid.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300028

Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil
Provedor de dados: 42
Autores: Souza,Paulo A.; Marques-Toigo,Marleni.
A review of published papers and results of analysis of new material have allowed improvements on the palynostratigraphy of the Permian strata of the Paraná Basin in Rio Grande do Sul State. Based on first and last occurrences of certain species of pollen taxa, two palynozones are formalized, these are the Vittatina costabilis and Lueckisporites virkkiae Interval Zones, in ascending order. The Vittatina costabilis Interval Zone is subdivided into two units, in ascending order the Protohaploxypinus goraiensis and the Hamiapollenites karrooensis Subzones, and is recognized from the glacial (Itararé Group) and post-glacial sequence (Rio Bonito Formation and the base of the Palermo Formation). The Lueckisporites virkkiae Interval Zone occurs from the uppermost...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Permian; Paraná Basin; Biostratigraphy; Rio Grande do Sul.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200012

Ecological capability evaluation for afforestation and forest expansion using Geographic Information System (GIS) in management area of Caspian Sea
Provedor de dados: 42
Autores: HASHEMI,SEYED A.
Abstract Ecological capability evaluation is referred to as evaluation of potential capability of land and determination of its natural land use. In this paper, ecological capability of Lille Basin in Lahijan was evaluated for afforestation and forest expansion using Geographical Information Systems (GIS). For this purpose, information layers (slope, elevation, geographical directions, temperature, rainfall, humidity, soil type, and canopy cover) were prepared by digitizing the data obtained from concerned organizations. First, the layers were prepared based on coordinate systems and pixel value. Then, they were standardized using fuzzy membership functions. The evaluation criteria were prioritized with regard to expert opinion, and by using multi-criteria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological capability; Afforestation; AHP; Fuzzy; Forest.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703761

Investigation of local anesthetic and antimycobacterial activity of Ottonia martiana Miq. (Piperaceae)
Provedor de dados: 42
Autores: CUNICO,MIRIAM M.; TREBIEN,HERBERT A.; GALETTI,FÁBIO C.; MIGUEL,OBDULIO G.; MIGUEL,MARILIS D.; AUER,CELSO G.; SILVA,CÉLIO L.; SOUZA,ANA OLÍVIA DE.
ABSTRACT Ottonia martiana is a plant popularly known in Brazil by the use for toothache. Ethanolic extract (EE), hexane fraction (HF), dichloromethane fraction (DF) and piperovatine obtained from O. martiana were assayed in vitro and in vivo. The acute toxicity of EE was determined, and LD50 values of 164.5 and 65.0 mg/kg by the oral and intraperitoneal routes, respectively, indicated a high toxicity for EE in vivo, explaining its popular use by topical administration only. A local anesthetic-like effect of EE and its fractions was observed in experimental models using pain induction, and such effect involved an analgesic action. The antimycobacterial activity of EE, HF, DF and piperovatine was evaluated against Mycobacterium tuberculosis H37Rv ATCC 27924....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analgesic; Anesthetic; Antimycobacterial; Ottonia martiana; Piperaceae; Piperovatine.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501991

Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes
Provedor de dados: 42
Autores: FURTADO,ANDRÉ L. S.; CASPER,PETER; ESTEVES,FRANCISCO A.
The bacterioplanktonic abundance, biomass, and production within a tropical lagoon (Cabiúnas, Brazil) and two temperate lakes (Stechlin and Dagow, Germany) were compared. Bacterial abundance and production were significantly different among the three water bodies. The lowest bacterial production ( 0.8mug C l-1 d-1) was observed in the tropical Cabiúnas Lagoon despite its higher mean temperature and dissolved organic carbon concentration. Highest bacterioplankton abundance ( 2.6 x 10(9) cells l-1) and production ( 68.5mug C l-1 d-1) were measured in eutrophic Lake Dagow. In oligotrophic Lake Stechlin, the lowest bacterial biomass ( 48.05mug C l-1) was observed because of lower bacterial biovolume ( 0.248mum³) and lower bacterial abundance. Bacterial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial production; Leucine incorporation; Tropical lagoon; Temperate lake.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100005

Remote sensing of the chlorophyll-a based on OLI/Landsat-8 and MSI/Sentinel-2A (Barra Bonita reservoir, Brazil)
Provedor de dados: 42
Autores: WATANABE,FERNANDA; ALCÂNTARA,ENNER; RODRIGUES,THANAN; ROTTA,LUIZ; BERNARDO,NARIANE; IMAI,NILTON.
ABSTRACT In this present research, we assessed the performance of band algorithms in estimating chlorophyll-a (Chl-a) concentration based on bands of two new sensors: Operational Land Imager onboard Landsat-8 satellite (OLI/Landsat-8), and MultiSpectral Instrument onboard Sentinel-2A (MSI/Sentinel-2A). Band combinations designed for Thematic Mapper onboard Landsat-5 satellite (TM/Landsat-5) and MEdium Resolution Imaging Spectrometer onboard Envisat platform (MERIS/Envisat) were adapted for OLI/Landsat-8 and MSI/Sentinel-2A bands. Algorithms were calibrated using in situ measurements collected in three field campaigns carried out in different seasons. The study area was the Barra Bonita hydroelectric reservoir (BBHR), a highly productive aquatic system....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal bloom; Inland water color; Spectral index; Water quality; Satellite imagery.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501987

Rhabdosphaera clavigera (calcareous nannofossils) as paleotemperature indicators: a comparison with isotopic data
Provedor de dados: 42
Autores: WANDERLEY,MARIA DOLORES; MCMANUS,JERRY F.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200027

Schistosoma mansoni polo-like kinases and their function in control of mitosis and parasite reproduction
Provedor de dados: 42
Autores: Dissous,Colette; Grevelding,Christoph G; Long,Thavy.
Polo-like kinases are important regulators of cell cycle progression and mitosis. They constitute a family of conserved serine/threonine kinases which are highly related in their catalytic domains and contain polo boxes involved in protein-protein interactions and subcellular localization. In mammals, five Plks (Plk 1-5) encompass diverse roles in centrosome dynamics, spindle formation, intra S-phase and G2/M checkpoints and DNA damage response. Plk1 is a key positive regulator of mitosis and is overexpressed in various types of cancers. Plk4 is a divergent member of the Plk family, with essential functions in centriole duplication. Homozygous disruption of Plk1 or Plk4 in mice is lethal in embryos. Two Plk members SmPlk1 and SmSak, homologous to Plk1 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell cycle; Polo-like kinases; Reproduction; Schistosoma mansoni.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200022

Comparison of Polycyclic Aromatic Hydrocarbon (PAHs) concentrations in urban and natural forest soils in the Atlantic Forest (São Paulo State)
Provedor de dados: 42
Autores: Bourotte,Christine; Forti,Maria Cristina; Lucas,Yves; Melfi,Adolpho J.
Studies about pollution by Polycyclic Aromatic Hydrocarbons (PAHs) in tropical soils and Brazil are scarce. A study was performed to examine the PAHs composition, concentrations and sources in red-yellow Oxisols of remnant Atlantic Forest of the São Paulo State. Sampling areas were located in an urban site (PEFI) and in a natural one (CUNHA).The granulometric composition, pH, organic matter content and mineralogical composition were determined in samples of superficial soils. The sum of PAHs (ΣHPAs) was 4.5 times higher in the urban area than in the natural one. Acenaphthylene, acenaphthene, fluorene, phenanthrene and fluoranthene have been detected in the soils of both areas and presented similar concentrations. Acenaphthene and fluorene were the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Polycyclic aromatic hydrocarbons; PAHs; Tropical forest; Tropical soils; Urban soils.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100013

Integrated evaluation of the geology, aerogammaspectrometry and aeromagnetometry of the Sul-Riograndense Shield, southernmost Brazil
Provedor de dados: 42
Autores: HARTMANN,LÉO A.; LOPES,WILLIAM R.; SAVIAN,JAIRO F.
ABSTRACT An integrated evaluation of geology, aerogammaspectrometry and aeromagnetometry of the Sul-Riogran­dense Shield is permitted by the advanced stage of understanding of the geology and geochronology of the southern Brazilian Shield and a 2010 airborne geophysical survey. Gamma rays are registered from the rocks near the surface and thus describe the distribution of major units in the shield, such as the Pelotas batholith, the juvenile São Gabriel terrane, the granulite-amphibolite facies Taquarembó terrane and the numerous granite intrusions in the foreland. Major structures are also observed, e.g., the Dorsal de Canguçu shear. Magnetic signals register near surface crustal compositions (analytic signal) and total crust composition (total magnetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeromagnetometry; Aerogammaspectrometry; Gamma spectrometric provinces; Magnetic provinces; Sul-Riograndense Shield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100075

Behavioral alterations and Fos protein immunoreactivity in brain regions of bile duct-ligated cirrhotic rats
Provedor de dados: 42
Autores: SUEUR-MALUF,LUCIANA LE; VIANA,MILENA B.; NAGAOKA,MÁRCIA R.; AMORIM,ANA LAURA B.; CARDOSO,AMANDA N.; RODRIGUES,BRUNA C.; MENDES,NATÁLIA F.; BITTENCOURT,JACKSON C.; CÉSPEDES,ISABEL C.
Hepatic encephalopathy (HE) encompasses a variety of neuropsychiatric symptoms, including anxiety and psychomotor dysfunction. Although HE is a frequent complication of liver cirrhosis, the neurobiological substrates responsible for its clinical manifestations are largely unclear. In the present study, male Wistar rats were bile duct-ligated (BDL), a procedure which induces liver cirrhosis, and on the 21st day after surgery tested in the elevated plus-maze (EPM) and in an open field for anxiety and locomotor activity measurements. Analysis of Fos protein immunoreactivity (Fos-ir) was used to better understand the neurobiological alterations present in BDL animals. Plasma levels of ammonia were quantified and histopathological analysis of the livers was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anxiety; Bile-duct ligation; Fos-immunoreactivity; Hepatic encephalopathy; Locomotor activity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100331

The Effect of Ferrous Nano-oxide Particles on Physiological Traits and Nutritional Compounds of Soybean ( Glycine max L.) Seed
Provedor de dados: 42
Autores: SHEYKHBAGLOU,ROGHAYYEH; SEDGHI,MOHAMMAD; FATHI-ACHACHLOUIE,BAHRAM.
ABSTRACT Soybean (Glycine max L.) seed contains amounts of protein, lipid, carbohydrate and mineral elements, which protein and lipid have been known as a main part for soybean’s trade value. In this study, in order to investigate the effect of ferrous nano-oxide particles on nutritional compounds of soybean seed, an experiment with 5 treatments and 3 replications was conducted as a randomized complete block design. Treatments were 5 concentrations of ferrous nano-oxide particles including 0, 0.25, 0.5, 0.75 and 1 g L-1 which were sprayed 3 times at 4 and 8 leaves stage and pod initiation. Lipid and protein contents, fatty acids profile, some of mineral elements such as Fe, Mg, Ca and P, chlorophyll a, b and total chlorophyll content were determined....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Ferrous nano-oxide; Nutritional compounds of soybean seed; Fatty acids profile; Chlorophyll.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100485

Cotesia flavipes (CAM) (Hymenoptera: Braconidae) Supresses Immune Responses In Diatraea flavipennella (BOX) (Lepidoptera: Crambidae)
Provedor de dados: 42
Autores: PASSOS,ELIANA M. DOS; WANDERLEY-TEIXEIRA,VALÉRIA; MARQUES,EDMILSON J.; TEIXEIRA,ÁLVARO A.C.; BRAYNER,FÁBIO A.
The present research aimed to elucidate which aspects of immune responses in Diatraea flavipennella are suppressed by the parasitoid Cotesia flavipes, thus, ensuring parasitism success. We investigated the presence of apoptosis in fat body cells through the TUNEL technique. According to the results, reduced levels of nitric oxide and phenoloxidase activity were observed in larvae parasitized for three days, and reduced total number of hemocytes, after three and seven days. An increase in plasmatocytes and decrease in spherulocytes numbers were observed in the differential count on the third day of parasitism. The number of melanized microspheres in parasitized larvae was low and indicated less intense melanization. The ultrastructural analysis confirmed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Encapsulation; Hemocytes; Humoral response; Parasitoid; Sugarcane Moth Borer (Diatraea saccharalis).
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402013

Common Deletion (CD) in mitochondrial DNA of irradiated rat heart
Provedor de dados: 42
Autores: SIQUEIRA,RAQUEL G.; SILVA,DAYSE A. DA; MELO,LUIZ D.B. DE; CARVALHO,ELIZEU F. DE; FERREIRA-MACHADO,SAMARA C.; ALMEIDA,CARLOS E.V. DE.
The purpose of this study was to map the common deletion (CD) area in mtDNA and investigate the levels of this deletion in irradiated heart. The assays were developed in male Wistar rats that were irradiated with three different single doses (5, 10 or 15 Gy) delivered directly to the heart and the analyses were performed at various times post-irradiation (3, 15 or 120 days). The CDs area were sequenced and the CD quantified by real-time PCR. Our study demonstrated that the CD levels progressively decreased from the 3rduntil the 15th day after irradiation, and then increased thereafter. Additionally, it was observed that the levels of CD are modulated differently according to the different categories of doses (moderate and high). This study demonstrated an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular complications; Common mitochondrial DNA deletion; Mediastinal tumours; Radiotherapy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200685

Rapid assessment methods of resilience for natural and agricultural systems
Provedor de dados: 42
Autores: Torrico,Juan C.; Janssens,Marc J.J.
The resilience, ecological function and quality of both agricultural and natural systems were evaluated in the mountainous region of the Atlantic Rain Forest of Rio de Janeiro through Rapid Assessment Methods. For this goal new indicators were proposed, such as eco-volume, eco-height, bio-volume, volume efficiency, and resilience index. The following agricultural and natural systems have been compared according: (i) vegetables (leaf, fruit and mixed); (ii) citrus; (iii) ecological system; (iv) cattle, (v) silvo-pastoral system, (vi) forest fragment and (vii) forest in regeneration stage (1, 2 and 3 years old). An alternative measure (index) of resilience was proposed by considering the actual bio-volume as a function of the potential eco-volume. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bio-volume; Eco-volume; Atlantic Rain Forest; Rapid assessment methods; Resilience index; Farming systems; Natural systems.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400027

Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
Provedor de dados: 42
Autores: GUIMARÃES,JOSÉ T.F.; SAHOO,PRAFULLA K.; SOUZA-FILHO,PEDRO W.M.; FIGUEIREDO,MARIANA M.J. COSTA DE; REIS,LUIZA S.; SILVA,MARCIO S. DA; RODRIGUES,TARCÍSIO M.
ABSTRACT Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Forest; Canga vegetation; Palynology; Carbon and nitrogen isotopes; Geochemistry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400502

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil
Provedor de dados: 42
Autores: OLIVEIRA,EMILIANO C.; ROSSETTI,DILCE F.; UTIDA,GISELLE.
ABSTRACT This paper presents a sedimentological and stratigraphical study of Quaternary (Middle to Late Pleistocene/Holocene) continental carbonates outcrops inside Pantanal Basin and its surroundings, especially in Serra da Bodoquena, Pantanal do Miranda and Corumbá/Ladário plateau, in the state of Mato Grosso do Sul, as well as in Serra das Araras, in the state of Mato Grosso. The aim is to understand the depositional paleoenvironments and analyse climate and tectonic influences in their genesis and evolution. The results show that the deposition of these continental carbonates started in the Middle to Late Pleistocene and have continued, with some interruptions, until the present days. Sedimentary successions were identified in the different areas,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Central Brazil; Continental carbonates; Holocene; Paleoenvironments; Pantanal Basin; Pleistocene.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200407

Spatial-temporal distribution of fire-protected savanna physiognomies in Southeastern Brazil
Provedor de dados: 42
Autores: Pinheiro,Marcelo H.O.; Azevedo,Thiago S. de; Monteiro,Reinaldo.
The analysis of the influence of edaphic finer textures, as a facilitating factor for the expansion of forest formations in the absence of fire, was possible thanks to rare characteristics found in a savanna fragment located in the State of São Paulo, Brazil. The total suppression of fire for over four decades, and the occurrence of two savanna physiognomies, cerrado sensu stricto and cerradão, allowed the conduction of this study based on the hypothesis that cerradão, a physiognomy of forest aspect consisting of fire-sensitive tree and shrubs species, is favored by fire absence and higher soil hydric retention capacity. Edaphic samples were collected from a regular grid of 200 m² for the production of isopletic maps of the distribution of clay, fine sand,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Fire suppression; Geostatistics; Savanna dynamics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200014

Comparative toxicity of essential oil and blends of selected terpenes of Ocotea species from Pernambuco, Brazil, against Tetranychus urticae Koch
Provedor de dados: 42
Autores: MORAES,MARCILIO M. DE; CAMARA,CLAUDIO A.G. DA; SILVA,MILENA M.C. DA.
ABSTRACT Essential oils from the leaves of two species of the genus Ocotea that occur in the Atlantic Forest in the state of Pernambuco, Brazil, were analyzed using gas chromatography-mass spectrometry. The acaricidal activity of these oils as well as 11 selected components and blends were evaluated in fumigation and residual contact tests against the two-spotted spider mite (Tetranychus urticae). Sixty-seven constituents were identified, totaling 97.3 ± 0.3% and 97.8 ± 0.5% of the oils from O. duckei and O. glomerata, respectively. Sesquiterpene was the dominant class. The compounds β-caryophyllene (18.6 ± 0.1%) and aromadendrene (17.3 ± 0.6%) were the main constituents of the oils from O. duckei and O. glomerata, respectively. Acaricidal action varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acaricidal activity; Β-caryophyllene; Essential oil; Ocotea; Tetranychus urticae.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401417

Large amplitude oscillations for a class of symmetric polynomial differential systems in R³
Provedor de dados: 42
Autores: Llibre,Jaume; Messias,Marcelo.
In this paper we study a class of symmetric polynomial differential systems in R³, which has a set of parallel invariant straight lines, forming degenerate heteroclinic cycles, which have their two singular endpoints at infinity. The global study near infinity is performed using the Poincaré compactification. We prove that for all n &lt;FONT FACE=Symbol&gt;Î&lt;/FONT&gt; N there is epsilonn &gt; 0 such that for 0 &lt; epsilon &lt; epsilonn the system has at least n large amplitude periodic orbits bifurcating from the heteroclinic loop formed by the two invariant straight lines closest to the x-axis, one contained in the half-space y &gt; 0 and the other in y &lt; 0.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Infinite heteroclinic loops; Periodic orbits; Symmetric systems.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400001

Construction of yellow fever virus subgenomic replicons by yeast-based homologous recombination cloning technique
Provedor de dados: 42
Autores: Queiroz,Sabrina R.A.; Silva,Andréa N.M.R.; Santos,Jefferson J.S.; Marques Jr,Ernesto T.A.; Bertani,Giovani R.; Gil,Laura H.V.G.
RNA replicon derived from Flavivirus genome is a valuable tool for studying viral replication independent of virion assembly and maturation, besides being a great potencial for heterologous gene expression. In this study we described the construction of subgenomic replicons of yellow fever virus by yeast-based homologous recombination technique. The plasmid containing the yellow fever 17D strain replicon (pBSC-repYFV-17D), previously characterized, was handled to heterologous expression of the green fluorescent protein (repYFV-17D-GFP) and firefly luciferase (repYFV-17D-Luc) reporter genes. Both replicons were constructed by homologous recombination between the linearized vector pBSC-repYFV-17D and the PCR product containing homologous 25 nucleotides ends...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cloning technique; Homologous recombination; Replicon; Reporter gene; Yellow fever virus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100159

Detection, purification and characterization of a lectin from freshwater green algae Spirogyra spp.
Provedor de dados: 42
Autores: OLIVEIRA,ANTÔNIA S. DE; LÓSSIO,CLÁUDIA F.; RANGEL,ANNE J.; MARTINS,MARIA G.Q.; NASCIMENTO,FERNANDO E.P. DO; ANDRADE,MARIA L.L. DE; CAVADA,BENILDO S.; LACERDA,SÍRLEIS R.; NASCIMENTO,KYRIA S. DO.
ABSTRACT Freshwater algae are rich sources of structurally biologically active metabolites, such as fatty acids, steroids, carotenoids and polysaccharides. Among these metabolites, lectins stand out. Lectins are proteins or glycoproteins of non-immune origin which bind to carbohydrates or glycoconjugates, without changing ligand structure. Many studies have reported on the use of Spirogyra spp. as effective bioindicators of heavy metals; however, reports on Spirogyra molecular bioprospecting are quite limited. Therefore, this study aimed to detect, isolate, purify and characterize a lectin present in the freshwater green algae Spirogyra. Presence of the lectin protein in the extract was detected by hemagglutination assays. Subsequently, the protein extract...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Characterization; Lectin; Purification.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502113

Glucocorticoid susceptibility and in vivo ABCB1 activity differ in murine B cell subsets
Provedor de dados: 42
Autores: COSTA,KELLI M. DA; VALENTE,RAPHAEL C.; SILVA,JOYLE M.C. DA; PAIVA,LUCIANA S. DE; RUMJANEK,VIVIAN M.
Abstract Glucocorticoids are produced and released by the adrenal gland and become elevated in response to stress. Although glucocorticoids are well known for their immunosuppressive effects, less is known about their effects on B cells. ABCB1 is an efflux pump expressed in both cancer and normal cells, modulating the gradient of various metabolites, including hydrocortisone. Our goal was to evaluate the effect of this glucocorticoid on murine B cell differentiation and whether sensitivity to hydrocortisone could be related to ABCB1 activity in vivo. C57BL/6 mice received one or three consecutive i.p. injections of hydrocortisone (70, 140 and 200 mg/kg/day). ABCB1 activity was evaluated via the rhodamine-123 transport and inhibited by cyclosporin A in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ABC transporters; B cells; Immunoregulation; Steroid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603081

Efficient algorithms for packing boxes into container
Provedor de dados: 42
Autores: LINS,SOSTENES L. S.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300035

Effects of omega-3 supplementation on interleukin and neurotrophin levels in an animal model of schizophrenia
Provedor de dados: 42
Autores: ZUGNO,ALEXANDRA I.; CANEVER,LARA; MASTELLA,GUSTAVO; HEYLMANN,ALEXANDRA S.; OLIVEIRA,MARIANA B.; STECKERT,AMANDA V.; CASTRO,ADALBERTO A.; PIZZOL,FELIPE DAL; QUEVEDO,JOÃO; GAMA,CLARISSA S.
ABSTRACTNew studies suggest that polyunsaturated fatty acids, such as omega-3, may reduce the symptoms of schizophrenia. The present study evaluated the preventive effect of omega-3 on interleukines (IL) and neurotrophin brain-derived neurotrophic factor (BDNF) levels in the brains of young rats subjected to a model of schizophrenia. Treatment was performed over 21 days, starting on the 30th day of rat's life. After 14 days of treatment with omega-3 or vehicle, a concomitant treatment with saline or ketamine (25 mg/kg) was started and maintained until the last day of the experiment. BDNF levels in the rat's prefrontal cortex were decreased at 1 h and 24 h after the last administration of ketamine, whereas the group administered with ketamine and omega-3...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Omega-3; Ketamine; Schizophrenia; Neurotrophins; Interleukins.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301475

Nuclear entropy, angular second moment, variance and texture correlation of thymus cortical and medullar lymphocytes: Grey level co-occurrence matrix analysis
Provedor de dados: 42
Autores: PANTIC,IGOR; PANTIC,SENKA; PAUNOVIC,JOVANA; PEROVIC,MILAN.
Grey level co-occurrence matrix analysis (GLCM) is a well-known mathematical method for quantification of cell and tissue textural properties, such as homogeneity, complexity and level of disorder. Recently, it was demonstrated that this method is capable of evaluating fine structural changes in nuclear structure that otherwise are undetectable during standard microscopy analysis. In this article, we present the results indicating that entropy, angular second moment, variance, and texture correlation of lymphocyte nuclear structure determined by GLCM method are different in thymus cortex when compared to medulla. A total of 300 thymus lymphocyte nuclei from 10 one-month-old mice were analyzed: 150 nuclei from cortex and 150 nuclei from medullar regions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Texture analysis; GLCM matrix; CD4; CD8; Gene.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301063

Isolation induced changes in Guinea Pig Cavia porcellus pup distress whistles
Provedor de dados: 42
Autores: Monticelli,Patrícia F.; Tokumaru,Rosana S.; Ades,César.
Guinea Pig Cavia porcellus pups emit high-pitched distress whistles when separated from their mother. In order to assess the influence of the duration of a brief isolation period on whistle acoustic structure, werecorded the distress whistles of six 8-day old pups separated for 15 min from their group in a novel environment and compared the mean values of the first and last 30 whistle notes. Acoustic analysis revealed, throughout the session, a significant decrease in whistle duration, an increase in mean frequency and a tendency for a decrease in number of harmonics in the first part of the note. Results demonstrate that, throughout a brief isolation period, the vocal response of Guinea Pig pups to isolation undergoes structural changes possibly related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic communication; Isolation calls; Guinea Pig.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200027

Habitat Structural Effect on Squamata Fauna of the Restinga Ecosystem in Northeastern Brazil
Provedor de dados: 42
Autores: DIAS,EDUARDO J.R.; ROCHA,CARLOS F.D.
In this work, we surveyed data on richness and composition of squamatan reptiles and habitat structural effect in nine areas of restinga ecosystem in the State of Bahia, northeastern Brazil. The “restinga” ecosystems are coastal sand dune habitats on the coast of Brazil. Our main hypothesis is that the Squamata fauna composition along these restinga areas would be modulated by habitat structural. After 90 days of field sampling we recorded approximately 5% of reptile species known in Brazil. The composition of Squamata assemblages varied mainly based on the presence or absence of lizards of the genera Ameivula and Tropidurus. Our data showed that habitat structure consistently affected the composition of local Squamata fauna, especially lizards.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gradient analyses; Habitat structure; Lizards and snakes; Restinga ecosystem; Northeastern Brazil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100359

Peculiar anatomical traits, high durability, and potential ornamental use of Cyclanthaceae as fresh foliage
Provedor de dados: 42
Autores: MEDINA,MARIA CAMILA; HOYOS-GÓMEZ,SAÚL E.; DEMARCO,DIEGO; TUBERQUIA,DINO.
ABSTRACT Wild plant species with potential for use as ornamental green foliage are often reported. Nevertheless, there are few studies evaluating morphological and anatomical aspects associated with this use. Preliminary trials suggest that the species of Sphaeradenia (Sander ex Mast.) Harling, a Cyclantaceae that occurs from Costa Rica to Peru, is suitable to be used as fresh foliage because of attractiveness of their leaves in vase and its durability without showing tissue damage, compared with other genera of this family. Through the study of anatomical characters, it is possible to predict the potential of a species that can serve as ornamental foliage. In this study, three foliar anatomical features (thickness of the cuticle and leaf, and percentage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Cuticle; Fibers; Mesophyll; Sphaeradenia laucheana.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502399

Pudicinae (Nematoda) coparasitic in Proechimys roberti (Rodentia: Echimyidae) from the Brazilian Amazonia: description of a new species of Pudica, redescription of Pudica evandroi (Travassos) and updated key to the species of the genus
Provedor de dados: 42
Autores: SERRANO,PAULA C.; DURETTE-DESSET,MARIE-CLAUDE; DIGIANI,MARÍA C.
Abstract: The re-examination of nematodes collected decades ago from a spiny rat, Proechimys roberti (Echimyidae) from Pará State, revealed the presence of Acanthostrongylus acanthostrongylusTravassos, 1937, and two coparasitic species of Pudica (Heligmonellidae: Pudicinae), one of them new to science. Pudica minima n. sp. mostly resembles Pudica tenuaDurette-Desset, 1970, described from Proechimys semispinosus in Colombia. Nevertheless, it differs from P. tenua by having a synlophe with 12 ridges with poorly developed careen, bursal pattern of type 2-2-1 on the right lobe, bursal rays 2 and 3 similar in length, and spicules longer with spoon-shaped tips. Pudica evandroi (Travassos, 1937) was already described from Pr. roberti but its synlophe remained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heligmonellidae; Heligmosomum alpha; Pará State; Pudica minima n. sp.; Spiny rats; Synlophe.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700605

Palisadegrass effects on N fertilizer dynamic in intercropping systems with corn
Provedor de dados: 42
Autores: ALMEIDA,RODRIGO E.M. DE; OLIVEIRA,SILAS M. DE; LAGO,BRUNO C.; P. JUNIOR,CLOVIS; TRIVELIN,PAULO C.O.; FAVARIN,JOSÉ L.
ABSTRACT Corn grain yield, nitrogen (N) fertilizer efficiency and distribution to corn alone and three forms of corn and palisadegrass (Urochloa spp.) intercropping implantation was investigated. A field experiment with 15N labeling fertilizer was performed in randomized block design. No form of palisadegrass intercropping implantation affected corn grain yield, total N accumulation and N use efficiency (NUE), which were 8.7 t ha-1, 205 kg ha-1 and 37% respectively. The palisadegrass produced on average 1.9 t of dry mass, absorbing a maximum of 6 kg ha-1 or 5.5% of N fertilizer during corn growing. Furthermore, the palisadegrass did not affect N fertilizer distribution in soil-plant system, in which 28.2% was recovered in the soil and 40.4% in the plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N isotope; Crop-livestock integration; Nitrogen use efficiency; No-tillage; Urochloa spp.; Zea mays.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401917

Mathematical and Numerical Modeling of Turbulent Flows
Provedor de dados: 42
Autores: Vedovoto,João M.; Serfaty,Ricardo; Silveira Neto,Aristeu Da.
The present work is devoted to the development and implementation of a computational framework to perform numerical simulations of low Mach number turbulent flows over complex geometries. The algorithm under consideration is based on a classical predictor-corrector time integration scheme that employs a projection method for the momentum equations. The domain decomposition strategy is adopted for distributed computing, displaying very satisfactory levels of speed-up and efficiency. The Immersed Boundary Methodology is used to characterize the presence of a complex geometry. Such method demands two separate grids: An Eulerian, where the transport equations are solved with a Finite Volume, second order discretization and a Lagrangian domain, represented by a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Turbulent flows; Large Eddy Simulation; Immersed Boundary Method; Low-Mach Number Flows; Industrial Flows.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201195

Litter Size Reduction Induces Metabolic and Histological Adjustments in Dams throughout Lactation with Early Effects on Offspring
Provedor de dados: 42
Autores: Xavier,João Lucas P.; Scomparin,Dionizia X.; Pontes,Catherine C.; Ribeiro,Paulo Roberto; Cordeiro,Maiara M.; Marcondes,Jessica A.; Mendonça,Felipe O.; Silva,Makcine T. da; Oliveira,Fabio B. de; Franco,Gilson C.N.; Grassiolli,Sabrina.
In the present study we analyzed morphological and metabolic alterations in dams nursing small litters and their consequences to offspring throughout lactation. Offspring sizes were adjusted to Small Litter (SL, 3 pups/ dam) and Normal Litter (NL, 9 pups/ dam). Body weight, food intake, white adipose tissue (WAT) content, histological analysis of the pancreas, mammary gland (MG) and brown adipose tissue (BAT) as well as, plasma parameters and milk composition were measured in dams and pups on the 7th, 14th and 21st days of lactation. In general, SL-dams presented higher body weight and retroperitoneal fat content, elevated fat infiltration in BAT, reduced islets size and hyperglycemia throughout lactation in relation to NL-dams (p&lt;0.05). Moreover, MG...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dams; Metabolic programming; Milk; Offspring.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100803

Essential oils from Piper aduncum inflorescences and leaves: chemical composition and antifungal activity against Sclerotinia sclerotiorum
Provedor de dados: 42
Autores: VALADARES,ANNA CAROLINA F.; ALVES,CASSIA CRISTINA F.; ALVES,JOSÉ MILTON; DE DEUS,ISABELLA P.B.; DE OLIVEIRA FILHO,JOSEMAR G.; DOS SANTOS,TAINÁ CAROLINE L.; DIAS,HERBERT JÚNIOR; CROTTI,ANTÔNIO EDUARDO M.; MIRANDA,MAYKER L.D.
Abstract Even though essential oils from Piper aduncum (Piperaceae) have different biological activities, little is known about their application to agricultural areas. White mold is a plant disease caused by the phytopathogen Sclerotinia sclerotiorum, which needs to be controlled by alternative measures. This study aimed at evaluating the effect of essential oils from P. aduncum leaves (PL-EO) and inflorescences (PI-EO) on the mycelial growth of S. sclerotiorum. Essential oils from P. aduncum were obtained by hydrodistillation by a Clevenger-type apparatus while their chemical composition was analyzed by GC-MS and GC-FID. Piperitone (23.4 %), myristicin (12.4 %), terpinen-4-ol (12.3 %), β-caryophyllene (7.2 %), α-humulene (6.9 %), germacrene-D (6.9 %) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper aduncum; Essential oils; Piperitone; Antifungal activity; Sclerotinia sclerotiorum.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602691

Rhinoxenus (Dactylogyridae) parasitizing piranhas (Serrasalmidae) at its southernmost limit of distribution (Paraná River, Argentina), with the description of two new species
Provedor de dados: 42
Autores: ROSSIN,MARÍA A.; FRANCESCO,PABLO N. DE; IRIGOITIA,MANUEL M.; SCARABOTTI,PABLO A.; TAGLIORETTI,VERÓNICA; TIMI,JUAN T.
Abstract Abstract: Three piranha species, Serrasalmus maculatus, S. marginatus and Pygocentrus nattereri, living sympatrically in the lower Paraná River (Argentina) were examined searching for nasal monogeneans to know its diversity and distribution. Four species of monogeneans belonging to Rhinoxenus were found parasitizing the nasal cavities. Two new species are described, and new morphological data of 2 previously described species is provided. Rhinoxenus argentinensis n. sp. is characterized by having the male copulatory organ (MCO) as a coiled tube with a reel shaped-base; an elongated accessory piece articulated to base of MCO; a sinistral vagina with a sclerotized vestibule, and a sclerotized cap of the ventral anchor laterally modified forming a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piranhas; Nasal parasites; Rhinoxenus spp; South American rivers.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700621

Secretory organelles of pathogenic protozoa
Provedor de dados: 42
Autores: Souza,Wanderley de.
Secretory processes play an important role on the biology and life cycles of parasitic protozoa. This review focus on basic aspects, from a cell biology perspective, of the secretion of (a) micronemes, rhoptries and dense granules in members of the Apicomplexa group, where these organelles are involved in the process of protozoan penetration into the host cell, survival within the parasitophorous vacuole and subsequent egress from the host cell, (b) the Maurer's cleft in Plasmodium, a structure involved in the secretion of proteins synthesized by the intravacuolar parasite and transported through vesicles to the erythrocyte surface, (c) the secretion of macromolecules into the flagellar pocket of trypanosomatids, and (d) the secretion of proteins which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parasitic protozoa; Cell secretion; Apicomplexa; Trypanosomatids; Encystation vesicles.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200008

New evidence of feathers in the Crato Formation supporting a reappraisal on the presence of Aves
Provedor de dados: 42
Autores: Sayão,Juliana M.; Saraiva,Antonio A.F.; Uejima,Angelica M.K.
The preservation of delicate structures such as feathers is very rare in the paleontological record, due to the fragility of their components. Fossil feathers have been reported from approximately 50 deposits around the world, from the Late Jurassic to the Pleistocene. In Brazil initial findings consisted of a primary feather of a large bird found in the Tremembé Formation. Other occurrences are preserved in the Crato Formation, where several symmetrical and one single asymmetrical feather was found. Based on three new specimens and reassessing further feather occurrences we cannot confirm the presence of volant Aves in this deposit. The presence of an asymmetrical feather without barbules and hooks hints at the previous existence of a flightless animal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araripe Basin; Crato Formation; Cretaceous; Feathers; Theropod.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100010

Mineral composition, nutritional properties, total phenolics and flavonoids compounds of the atemoya fruit (Annona squamosa L. x Annona cherimola Mill.) and evaluation using multivariate analysis techniques
Provedor de dados: 42
Autores: SANTOS,WALTER N.L. DOS; SAUTHIER,MARIA CELESTE S.; CAVALCANTE,DANNUZA D.; BENEVIDES,CLÍCIA M.J.; DIAS,FÁBIO S.; SANTOS,DANIELE C.M.B.
ABSTRACT The atemoya is a hybrid fruit obtained by crossing of cherimoya (Annona cherimola Mill.) with sweet sop (Annona squamosa L.). The information about chemical composition of atemoya is scarce. The mineral composition was evaluated employing Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES) and the centesimal composition and the physico-chemical parameters were assessed employing procedures described in the AOAC methods. The total phenolic compounds (TPC) and total flavonoids (TF) were determined using spectroanalytical methods. Considering the Reference Daily Intake (RDI), the concentrations of K, Cu and Vitamin C found in atemoya were the highest, representing about 32, 23 and 37% of the RDI, respectively. The total carbohydrates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atemoya; Food composition; ICP OES; Flavonoids; Phenolics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401243

Combined U-Pb and Lu-Hf isotope analyses by laser ablation MC-ICP-MS: methodology and applications
Provedor de dados: 42
Autores: Matteini,Massimo; Dantas,Elton L.; Pimentel,Marcio M.; Bühn,Bernhard.
The Lutetium-Hafnium isotopic system represents one of the most innovative and powerful tools for geochronology and isotopic studies. Combined U-Pb and Lu-Hf in situ analyses on zircon by LA-MC-ICP-MS permit to characterize isotopically the host magma from which it crystallized furnishing significant information for sediment provenance and crustal evolution studies. In this paper e describe the Lu-Hf systematic by LA-MC-ICP-MS developed in the laboratory of Geochronology of the University of Brasilia and report the results obtained by repeated analyses of 176Hf/177Hf isotopic ratio of three zircon standards: GJ-1 = 0.282022 ± 11 (n=56), Temora 2 = 0.282693 ± 14 (n=25) and UQZ = 0.282127 ± 33 (n=11). The 176Hf/177Hf ratio (0.282352 ± 22, n=14) of gem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LA-MC-ICP-MS; Lu-Hf; U-Pb; Zircon; Borborema Province.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200023

Additivity of tree biomass components using ratio estimate
Provedor de dados: 42
Autores: PÉLLICO NETTO,SYLVIO; BEHLING,ALEXANDRE.
Abstract: This study deals with the subject biomass estimation. The objective was to achieve the additivity of tree biomass components, which is defined as the compatibility among the component predictions and total tree biomass, using ratio estimates. The biomass estimation model was applied to black wattle trees in forest stands, which include a sample of 670 trees in an age range of 1 to 10.75 years. The adjusted model, in which the total biomass, or sum of predicted components, is a function of the stem volume multiplied by the Scalar Coefficients Proxy of Density, proved to be of great interest for biomass estimation and consistent when compared to the results obtained by WNSUR estimates (traditional method). The natural additivity of the tree biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scalar coefficients proxy of density; Ratio estimate; Stem volume; Quadratic mean diameter; WNSUR.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500851

Seasonal variations, metal distribution and water quality in the Todos os Santos River, Southeastern Brazil: a multivariate analysis
Provedor de dados: 42
Autores: PEREIRA,CLÁUDIA A.F.; MAIA,LUIZ F.O.; FARIA,MÁRCIA C.S.; FIDÊNCIO,PAULO H.; BOMFETI,CLEIDE A.; BARBOSA JUNIOR,FERNANDO; RODRIGUES,JAIRO L.
Abstract In aquatic habitats, metal contamination from natural and anthropogenic sources continues to pose a concern for human and environmental health. Thus, it is important to complete monitoring studies to assess patterns and the extent of metal contamination in these ecosystems. The purpose of this work was to determine the concentrations of 31 chemical elements and water quality parameters of the Todos os Santos River located in the Mucuri Valley, Minas Gerais, Brazil. A multivariate statistical analysis was used to determine any seasonal and spatial patterns from the data. Results demonstrated that metals including Al, Fe, and Ni exceeded Brazilian and international guidelines nutrients as P also exceed water quality standards. Principal components...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxic pollutants; Metals; Water quality; Environment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602701

Identification of a novel plant-derived attractant for Acromyrmex lobicornis leaf-cutting ants
Provedor de dados: 42
Autores: ALMA,ANDREA M.; FERNANDEZ,PATRICIA C.; PERRI,DAIANA; BUTELER,MICAELA.
Abstract: Leaf-cutting ants are considered major pests of agriculture and forestry in the Neotropics. Attractive toxic baits are the prevailing method for managing them. Thus, there is great interest in identifying attractants to incorporate into these baits. Moreover, leaf-cutting ants can avoid toxic baits by associating the attractant with the toxin. We evaluated attractiveness of heptyl butyrate, a volatile compound found in fresh apples and plums. We conducted field experiments with ten colonies ofAcromyrmex lobicornis. First, we evaluated the behaviour of ants exposed to heptyl butyrate at 1% by surrounding resources. Then, we compared the attractiveness of heptyl butyrate and orange pulp, the most commonly used attractant. Finally, we evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acromyrmex lobicornis; Hepyl butyrate; Pest management; Toxic baits; Attractant.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500612

Feeding ecology of Erythrolamprus jaegeri jaegeri (Günter, 1858) and Erythrolamprus poecilogyrus sublineatus (Cope, 1860) in the coastal zone of Subtropical Brazil (Serpentes, Dipsadidae)
Provedor de dados: 42
Autores: CORRÊA,DANIELE N.; QUINTELA,FERNANDO M.; LOEBMANN,DANIEL.
ABSTRACT The snakes Erythrolamprus jaegeri jaegeri and Erythrolamprus poecilogyrus sublineatus are sympatric and syntopic in the coastal region of southern Brazil. Herein, we analyzed the diet composition to evaluate the niche breadth and the prey selection by both species. We examined 192 specimens, and analysis of stomach contents revealed that both species predominantly consume anurans. However, the diet of E. j. jaegeri consists mainly of fish and amphibians, whereas that of E. p. sublineatus is broader, including fish, amphibians, reptiles and mammals. The Standardized Levins Index presented lower values for E. j. jaegeri (BA = 0.17) than for E. p. sublineatus (BA = 0.61), evidencing specialist and generalist strategies for each species, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Ophidians; Prey; Size; Niche.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100293

Treatment of critical defects produced in calvaria of mice with mesenchymal stem cells
Provedor de dados: 42
Autores: Monteiro,Betânia S.; Argôlo-Neto,Napoleão M.; Nardi,Nance B.; Chagastelles,Pedro C.; Carvalho,Pablo H.; Bonfá,Laila P.; Filgueiras,Richard R.; Reis,Amanda S.; Del Carlo,Ricardo J.
Mesenchymal stem cells (MSC) are present in specialized niches in perivascular regions of adult tissues and are able to differentiate into various cell types, such as those committed to repairing. Bone marrow derived MSC from eight young mice C57BL/ 6 gfp+ were expanded in culture for repairing critical defects in calvarial bone produced in twenty-four young isogenic adult C57BL/6 mice. The animals were subjected to a cranial defect of 6.0mm diameter and divided into two equal experimental groups. Control group did not receive any treatment and the treated group received a MSC pellet containing 1.0 x 10(7) cells/mL into the defects. The group treated with MSC showed increased angiogenesis and amount of new bone deposited on the defect limits than that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone therapy; Mesenchymal stem cell; Autologous graft; Mice; Calvaria.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300026

The representation of Caesalpinia echinata (Brazilwood) in Sixteenth-and-Seventeenth-Century Maps
Provedor de dados: 42
Autores: Rocha,Yuri T.; Presotto,Andrea; Cavalheiro,Felisberto.
Brazilwood was the first product found in Terra de Santa Cruz, and the first explored by Portuguese colonization of Brazil. This study aims at the Occidental Cartography and the historical files represented by Portugal's interest on mapping the marketed product found in Brazil. There presentation of Brazilwood in maps was possible due to scientific advancements, new land discoveries, and technological improvement during the 15th century, which all have taken cartography to a whole new period, stressing Portuguese hegemony in Asia and in the New World. The goal of this research was to identify and analyze maps from 16th and 17th centuries that represented the geographical distribution of Brazilwood, and its trade. Brazilwood was represented in many maps by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilwood; Cartography; Commerce; History; Illumination; Sixteenth and seventeenth centuries.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400014

Geographic and Gender Diversity in the Brazilian Academy of Sciences
Provedor de dados: 42
Autores: FERRARI,NATHÁLIA C.; MARTELL,RAQUEL; OKIDO,DANIELA H.; ROMANZINI,GRASIELE; MAGNAN,VIVIANE; BARBOSA,MARCIA C.; BRITO,CAROLINA.
ABSTRACT Recent studies have shown that diversity in race and gender is important to improve competitiveness, creativity and innovation. However, many studies have shown that the universe of science is not diverse in none of these criteria. In this work, we quantify the gender and geographic diversity in the Brazilian science. We study in detail the profile of the titular members of the most prestigious academic institution of Brazil, the Brazilian Academy of Sciences (ABC). Our analysis shows that the members of the ABC concentrates 80% in the Southeast region and that the overwhelming majority is composed by men. We show that female and male researchers have roughly the same amount of publication per year but women produce more human resources. Using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Gender balance; Women in science; Excellence in science.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502543

Lizard assemblage from a sand dune habitat from southeastern Brazil: a niche overlap analysis
Provedor de dados: 42
Autores: WINCK,GISELE R.; HATANO,FABIO; VRCIBRADIC,DAVOR; VAN SLUYS,MONIQUE; ROCHA,CARLOS F.D.
ABSTRACT Communities are structured by interactions of historical and ecological factors, which influence the use of different resources in time and space. We acquired data on time of activity, microhabitat use and diet of a lizard assemblage from a sand dune habitat in a coastal area, southeastern Brazil (Restinga de Jurubatiba). We analyzed the data of niche overlap among species in these three axes (temporal, spatial and trophic) using null models. We found a significant overlap within the trophic niche, whereas the overlap for the other axes did not differ from the expected. Based on this result, we discuss the factors acting on the structure of the local lizard community.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Null models; Communities; Sand dune habitat; Lizards; Brazil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200677

Cyclic nitroxides inhibit the toxicity of nitric oxide-derived oxidants: mechanisms and implications
Provedor de dados: 42
Autores: Augusto,Ohara; Trindade,Daniel F.; Linares,Edlaine; Vaz,Sandra M.
The substantial therapeutic potential of tempol (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy) and related cyclic nitroxides as antioxidants has stimulated innumerous studies of their reactions with reactive oxygen species. In comparison, reactions of nitroxides with nitric oxide-derived oxidants have been less frequently investigated. Nevertheless, this is relevant because tempol has also been shown to protect animals from injuries associated with inflammatory conditions, which are characterized by the increased production of nitric oxide and its derived oxidants. Here, we review recent studies addressing the mechanisms by which cyclic nitroxides attenuate the toxicity of nitric oxidederived oxidants. As an example, we present data showing that tempol...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyclic nitroxides; Tempol; Antioxidants; Nitric oxide-derived oxidants; Inflammation; Acetaminopheninduced hepatotoxicity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100013

Fruit quality preservation of 'Laetitia' plums under controlled atmosphere storage
Provedor de dados: 42
Autores: STEFFENS,CRISTIANO ANDRÉ; AMARANTE,CASSANDRO V.T. DO; ALVES,ERLANI O.; BRACKMANN,AURI.
The objective of this study was to evaluate the effect of controlled atmosphere (CA) on quality preservation of ‘Laetitia’ plums, mainly on internal breakdown, in order to determine the best CA storage conditions. Two experiments were carried out one in 2010, and another in 2011. In 2010, besides cold storage (CS; 21.0 kPa O2 + 0.03 kPa CO2), the fruits were stored under the following CA conditions (kPa O2+kPa CO2): 1+3, 1+5, 2+5, 2+10, and 11+10. In 2011, the fruits were stored under CS and CA of 1+0, 1+1, 2+1, and 2+2. The fruit stored under different CA conditions had lower respiration and ethylene production, better preservation of flesh firmness, texture and titratable acidity, lower skin red color, and lower incidence of skin cracking than the fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus salicina; Postharvest; Ripening; Physiological disorder.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100485

The Brazilian research contribution to knowledge of the plant communities from Antarctic ice free areas
Provedor de dados: 42
Autores: PEREIRA,ANTONIO B.; PUTZKE,JAIR.
This work aims to summarize the results of research carried out by Brazilian researchers on the plant communities of Antarctic ice free areas during the last twenty five years. Since 1988 field work has been carried out in Elephant Island, King George Island, Nelson Island and Deception Island. During this period six papers were published on the chemistry of lichens, seven papers on plant taxonomy, five papers on plant biology, two studies on UVB photoprotection, three studies about the relationships between plant communities and bird colonies and eleven papers on plant communities from ice free areas. At the present, Brazilian botanists are researching the plant communities of Antarctic ice free areas in order to understand their relationships to soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scientific publication; Botany; South Shetlands Island; Antarctica.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300923

iso-Kaurenoic acid from Wedelia paludosa D.C.
Provedor de dados: 42
Autores: Batista,Ronan; García,Pablo A.; Castro,María Ángeles; Del Corral,José M. Miguel; Feliciano,Arturo S.; Oliveira,Alaíde B. de.
A recent reinvestigation of aerial parts of Wedelia paludosa D.C. is described and reports, for the first time, the isolation of iso-kaurenoic acid from this species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Iso-kaurenoic acid; Silica gel impregnated with silver nitrate; Wedelia paludosa D.C.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400004

India ink induces apoptosis in the yellow clam Mesodesma mactroides (Deshayes, 1854). Optical and ultrastructural study
Provedor de dados: 42
Autores: CARVALHO,YURI B.M.; JETHRO,JUAN; POERSCH,LUIS H.; ROMANO,LUIS A.
ABSTRACT This paper reports on the acute inflammatory and cellular process in the yellow clam, Mesodesma mactroides, induced by injection of India ink into the muscular foot. Histological observations with optical and electronic microscopy were made at 24 and 48 h after injection. The induced cellular inflammatory response consisted of a general hemocyte infiltration without necrosis and apoptotic activity. Migration of ink-laden phagocytes across the intestinal epithelium was recorded. It appeared that the yellow clam "excreted" ink particles through the gill and kidney. The positive staining for apoptosis was observed in the digestive gland. Electronic microscopy revealed ultrastructural changes of endoplasmic reticulum stress and apoptotic bodies in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: India ink; Inflammation process; Endoplasmic reticulum stress; Apoptosis; Mesodesmama mactroides.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501981

Isotope stratigraphy in petroleum exploration
Provedor de dados: 42
Autores: Rodrigues,René.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400027

In-flight absolute calibration of the CBERS-2 CCD sensor data
Provedor de dados: 42
Autores: Ponzoni,Flávio J.; Zullo Junior,Jurandir; Lamparelli,Rubens A.C.
Since the first images of the sensors on board of CBERS-2 (China-Brazil Earth Resources Satellite) satellite were made available by the National Institute for Space Research (INPE), users have asked information about the conversion of image digital numbers to physical data (radiance or reflectance). This paper describes the main steps that were carried out to calculate the in-flight absolute calibration coefficients for CBERS-2 CCD level 2 (radiometric and geometric correction) images considering the reflectance-based method. Remarks about the preliminary evaluation of these coefficients application are also presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absolute calibration; CBERS-2; CCD; Reflectance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200015

Antioxidant, hemolytic, antimicrobial, and cytotoxic activities of the tropical Atlantic marine zoanthid Palythoa caribaeorum
Provedor de dados: 42
Autores: ALENCAR,DANIEL B.; MELO,ARTHUR A.; SILVA,GISELLE C.; LIMA,REBECA L.; PIRES-CAVALCANTE,KELMA M.S.; CARNEIRO,RÔMULO F.; RABELO,ADRIANA S.; SOUSA,OSCARINA V.; VIEIRA,REGINE H.S.F.; VIANA,FRANCISCO A.; SAMPAIO,ALEXANDRE H.; SAKER-SAMPAIO,SILVANA.
Marine invertebrates are capable of synthesizing bioactive compounds, which may be beneficial to human health. The aim of this study was to evaluate the antioxidant, hemolytic, antimicrobial and cytotoxic activities of crude extract (70% EtOH), and dichloromethane (DCM), ethyl acetate (EtOAc), and aqueous (Aq) fractions of the marine zoanthid Palythoa caribaeorum. The phenolic compound contents of the crude extract, DCM, EtOAc and Aq fractions were 12.33, 18.17, 10.53, and 3.18 mg GAE per gram, respectively. DPPH radical scavenging activity showed slight variation. IC50 of crude extract, DCM, EtOAc and Aq fractions were 11.13, 11.25, 11.74, and 11.28 µg mL-1, respectively. Among the sample, ferrous ion chelating was the highest in crude extract (IC50...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological activity; Marine invertebrate; Natural product; Sphenopidae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201113

A supramolecular proposal of lignin structure and its relation with the wood properties
Provedor de dados: 42
Autores: Abreu,Heber S.; Latorraca,João V.F.; Pereira,Regina P.W.; Monteiro,Maria Beatriz O.; Abreu,Fábio A.; Amparado,Kelysson F.
In spite of the great importance of cellulose the lignin is considered the second most abundant substance of the wood. However, little attention has been given it, mainly to wood properties. The lignin as well as other structural compounds (cellulose and hemicelluloses), has obviously an important role on the wood properties, probably due its composition and existent bonds. In general lignins have β-O-4 (Alkyl Aril Ether) as majoritary bond. This bond in a continued structure form big molecules with spiral conformation as virtual model. Based on this idea, lignins that have high/low β-O-4 content may have differentiated spiraled structures,suggesting different behaviors on the wood properties,which shows that the lignins (Guaicyl:Syringyl (GS)) of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lignin; Molecular conformation; Wood properties; Structure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100014

Detecting fluoride using a plant species as a bioindicator, evaluating the relationship of endocrine and nerve ganglia in small intestine function, and discovering the effects of protein malnourishment and probiotic supplementation in the digestive system of mammalian models
Provedor de dados: 42
Autores: Bonatto,Diego; Henriques,João Antonio Pêgas.
Tipo: Info:eu-repo/semantics/other
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300001

The structural molecular biology network of the State of São Paulo, Brazil
Provedor de dados: 42
Autores: Barbosa,João A.R.G.; Netto,Luis E.S.; Farah,Chuck S.; Schenkman,Sergio; Meneghini,Rogério.
This article describes the achievements of the Structural Molecular Biology Network (SMolBNet), a collaborative program of structural molecular biology, centered in the State of São Paulo, Brazil, and supported by São Paulo State Funding Agency (FAPESP). It gathers twenty scientific groups and is coordinated by the scientific staff of the Center of Structural Molecular Biology, at the National Laboratory of Synchrotron Light (LNLS), in Campinas. The SMolBNet program has been aimed at 1) solving the structure of proteins of interest related to the research projects of the groups. In some cases, the choice has been to select proteins of unknown function or of possible novel structure obtained from the sequenced genomes of the FAPESP genomic program; 2)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Structural genomics; Protein crystallography; Nuclear magnetic resonance; Protein structure.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200006

Physicochemistry, microbiology, fatty acids composition and volatile profile of traditional Söğle tulum (goat’s skin bag) cheese
Provedor de dados: 42
Autores: GURSOY,OGUZ; KÜÇÜKÇETİN,AHMET; GÖKÇE,ÖZGE; ERGİN,FİRUZE; KOCATÜRK,KÜBRA.
Abstract Söğle cheese is a type of traditional tulum (goat’s skin bag) cheese produced from goat’s milk or a mixture of goat’s and sheep’s milk in Küçük Söğle and Büyük Söğle villages, Antalya, Turkey. This is the first study that aimed to investigate the physicochemistry, microbiology, fatty acids composition and volatile profile of traditional Söğle cheeses ripened in goat’s skins for three months in wells. The pH and titratable acidity values, total solids, fat, protein and salt contents of the Söğle cheese samples ranged from 4.9 to 5.5, from 1.4 to 2.6%, from 46.5 to 55.0%, from 2.0 to 4.5%, from 34.9 and 42.2% and from 4.1 to 8.2%, respectively. The highest proportion of fatty acids in all cheese samples was palmitic acid (C16:0). The lactobacillus,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Traditional cheese; Goat’s skin bag; Tulum; Volatile composition.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703661

The cerebellum as a model for in vitro and in situ gap junctional coupling studies
Provedor de dados: 42
Autores: FRÓES,MARIA M.; CORREIA,ANA H. P.; MENEZES,JOÃO R. L.; CARVALHO,ANTÔNIO C. CAMPOS DE; LENT,ROBERTO; MOURA NETO,VIVALDO.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300029

Uptake and translocation of Cd and Zn in two lettuce cultivars
Provedor de dados: 42
Autores: FONTES,RENILDES L.F.; PEREIRA,JULIANA M.N.; NEVES,JULIO C.L.
Excess of heavy metals in agricultural soils is a matter of concern since it may decrease economic yield as a result of toxicity and lower product quality as a result of metal accumulation in edible plant parts. Among plant species and among cultivars within species a natural variation in uptake, translocation and distribution of trace elements occur. The transference of Cd and Zn, from soil to two lettuce (Lactuca sativa L.) cultivars grown in greenhouse, was evaluated in separate experiments for Cd and Zn.Plant dry and fresh matter yield and plant Cd and Zn concentrations were determined. Cultivar CRV showed greater potential for yield than CMM in both experiments. Cadmium and Zn translocation from roots to shoots increased with the increase of soil Cd...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadmium; Food quality; Lettuce; Plant nutrition; Soil; Zinc.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200907

Enzymes immobilized in Langmuir-Blodgett films: Why determining the surface properties in Langmuir monolayer is important?
Provedor de dados: 42
Autores: CASELI,LUCIANO.
ABSTRACT In this review we discuss about the immobilization of enzymes in Langmuir-Blodgett films in order to determine the catalytic properties of these biomacromolecules when adsorbed on solid supports. Usually, the conformation of enzymes depends on the environmental conditions imposed to them, including the chemical composition of the matrix, and the morphology and thickness of the film. In this review, we show an outline of manuscripts that report the immobilization of enzymes as LB films since the 1980’s, and also some examples of how the surface properties of the floating monolayer prepared previously to the transfer to the solid support are important to determine the efficiency of the resulting device.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Langmuir-Blodgett; Enzymes; Biosensors; Air-water interface.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200631

Magnetometry using SQUID
Provedor de dados: 42
Autores: MACHADO,FERNANDO L. A.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300036

A new toothless pterosaur (Pterodactyloidea) from Southern Brazil with insights into the paleoecology of a Cretaceous desert
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.; WEINSCHÜTZ,LUIZ C.; HOLGADO,BORJA; BANTIM,RENAN A.M.; SAYÃO,JULIANA M.
Abstract Abstract: The first pterosaur bone bed from Brazil was reported in 2014 at the outskirts of the town Cruzeiro do Oeste, Paraná State, in the Southern region of the country. Here named 'cemitério dos pterossauros' site, these outcrops were referred to the Goio-Erê Formation (Turonian-Campanian) of the Caiuá Group (Bauru Basin) and revealed the presence of hundreds of isolated or partially articulated elements of the tapejarine pterosaur Caiuajara and fewer amounts of a theropod dinosaur. Here we present a new tapejaromorph flying reptile from this site, Keresdrakon vilsoni gen. et sp. nov., which shows a unique blunt ridge on the dorsal surface of the posterior end of the dentary. Morphological and osteohistological features indicate that all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleoecology; Pterosauria; Pterodactyloidea; Keresdrakon vilsoni; Paraná; Cretaceous.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400517

Neuronal changes caused by Trypanosoma cruzi: an experimental model
Provedor de dados: 42
Autores: Moreira,Neide M; Sant'ana,Débora M. G; Araújo,Eduardo J. A; Toledo,Max J. O; Gomes,Mônica L; Araújo,Silvana M. de.
Define an experimental model by evaluating quantitative and morphometric changes in myenteric neurons of the colon of mice infected with Trypanosoma cruzi. Twenty-eight Swiss male mice were distributed into groups: control (CG, n=9) and inoculated with 100 (IG100, n=9) and 1000 (IG1000, n=10) blood trypomastigotes, Y strain-T. cruzi II. Parasitemia was evaluated from 3-25 days post inoculation (dpi) with parasites peak of 7.7 × 10(6) and 8.4 × 10(6) trypomastigotes/mL at 8th dpi (p&amp;gt;0.05) in IG100 and IG1000, respectively. Chronic phase of the infection was obtained with two doses of 100mg/Kg/weight and one dose of 250mg/Kg/weight of Benznidazole on 11, 16 and 18 dpi. Three animals from each group were euthanized at 18, 30 and 75 dpi. The colon was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chagas disease; Colon; Enteric nervous system; Giemsa; Trypanosoma cruzi.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200014

The conservation of native priority medicinal plants in a Caatinga area in Ceará, northeastern Brazil
Provedor de dados: 42
Autores: SANTOS,MARIA O.; ALMEIDA,BIANCA V. DE; RIBEIRO,DAIANY A.; MACÊDO,DELMACIA G. DE; MACÊDO,MÁRCIA J.F.; MACEDO,JULIMERY G.F.; SOUSA,FRANCISCA F.S. DE; OLIVEIRA,LIANA G.S. DE; SARAIVA,MANUELE E.; ARAÚJO,THATIANE M.S.; SOUZA,MARTA M.A.
ABSTRACT Much of the Brazilian semiarid region faces a considerable process of degradation of natural resources, and ethnobotanical studies have collaborated with important information about the use and traditional knowledge, serving as a tool to design conservation strategies of native plant species. Thus, this study aimed to determine medicinal species meriting conservation priorities in a “Caatinga” area in the northeastern of Brazilian territory. The ethnobotanical data were collected through semi-structured interviews with key subjects selected through the “snowball” technique. The availability and species conservation priority was verified by relative density, risk of collection, local use and use of diversity in the forest fragment sampled. It was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Availability; Biodiversity conservation; Therapeutic practices.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602675

Stratigraphic framework of Rio do Sul and Rio Bonito (Triunfo Member) formations in the Hercílio river valley (SC), Paraná basin (Early Permian)
Provedor de dados: 42
Autores: Castro,Marília R.; Perinotto,José A.J.; Castro,José C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400013

New Crocodyliform specimens from Recôncavo-Tucano Basin (Early Cretaceous) of Bahia, Brazil
Provedor de dados: 42
Autores: SOUZA,RAFAEL G. DE; CAMPOS,DIOGENES A.
ABSTRACT In 1940, L.I. Price and A. Oliveira recovered four crocodyliform specimens from the Early Cretaceous Bahia Supergroup (Recôncavo-Tucano Basin). In the present work, we describe four different fossil specimens: an osteoderm, a fibula, a tibia, and some autopodial bones. No further identification besides Mesoeucrocodylia was made due to their fragmentary nature and the reduced number of recognized synapomorphies for more inclusive clades. With exception of the fibula, all other specimens have at least one particular feature, which with new specimens could represent new species. The new specimens described here increase the known diversity of Early Cretaceous crocodyliforms from Brazil. This work highlights the great fossiliferous potential of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crocodyliforms; Early Cretaceous; Recôncavo Basin; Tucano Basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400504

Chemical composition fluctuations in roots of Plumbago scandens L. in relation to floral development
Provedor de dados: 42
Autores: Paiva,Selma R.; Lima,Lucilene A.; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Plumbago scandens L. is a Brazilian tropical/subtropical species that occurs along the coast. Chemically it is mainly represented by naphthoquinones, flavonoids, terpenoids and steroids. The aim of the present work is to study quantitative changes in the root metabolic production of Plumbago scandens during different physiologic developmental stages relative to floration. The results indicated the presence of four substances in the extracts: plumbagin, epi-isoshinanolone, palmitic acid and sitosterol, independent on developmental stage. The naphthoquinone plumbagin has always showed to be the major component of all extracts. Naphthoquinones exhibited their highest content during floration, while the content of the two others components decreased during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GC/MS; Plant physiology; Plubaginaceae; Secondary metabolites.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400004

The eolianites between Sanga do Cabral and Botucatu formations in Rio Grande do Sul State, Brazil
Provedor de dados: 42
Autores: NOWATZKI,CARLOS H.; KERN,HENRIQUE P.
This paper discusses the facies distribution of Mesozoic eolian sandstones between the Sanga do Cabral and Botucatu formations and also their contact relationships, in São Leopoldo area, State of Rio Grande do Sul (RS), southern Brazil. The main distinctive characteristics regarding these sandstones and formations are the mineralogical composition, paleocurrents and the occurrence of wet interdune deposits. These interdune deposits are characterized by frequent thin mudstone layers with mudcracks, ichnofossils and salt impressions. There are also some features that resemble plant fossils. The distinctive characteristics of these sequences to Sanga do Cabral and Botucatu formations allow us to suggest the informal name of Pedreira Sandstone, considering its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stratigraphy; Paraná Basin; Mesozoic; Faciology; Paleoenvironments.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200010

Bacterial and Archaeal Communities Variability Associated with Upwelling and Anthropogenic Pressures in the Protection Area of Arraial do Cabo (Cabo Frio region - RJ)
Provedor de dados: 42
Autores: COELHO-SOUZA,SERGIO A.; ARAÚJO,FÁBIO V.; CURY,JULIANO C.; JESUS,HUGO E.; PEREIRA,GILBERTO C.; GUIMARÃES,JEAN R.D.; PEIXOTO,RAQUEL S.; DÁVILA,ALBERTO M.R.; ROSADO,ALEXANDRE S.
ABSTRACTUpwelling systems contain a high diversity of pelagic microorganisms and their composition and activity are defined by factors like temperature and nutrient concentration. Denaturing gradient gel electrophoresis (DGGE) technique was used to verify the spatial and temporal genetic variability of Bacteria and Archaea in two stations of the Arraial do Cabo coastal region, one under upwelling pressure and another under anthropogenic pressure. In addition, biotic and abiotic variables were measured in surface and deep waters from three other stations between these stations. Six samplings were done during a year and adequately represented the degrees of upwelling and anthropogenic pressures to the system. Principal Component Analysis (PCA) showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial diversity; Leucine incorporation; Flow cytometry; Temperature; Nutrients availability; Brazilian Upwelling System.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401737

Development of an indirect ELISA assay to evaluation of the adaptive immune response of pacu (Piaractus mesopotamicus)
Provedor de dados: 42
Autores: FARIAS,THAIS H.V.; SILVA,KETHERSON R.; MARIGUELA,VIVIANE C.; MONTASSIER,HÉLIO J.; PILARSKI,FABIANA.
ABSTRACT The pacu is one of the most important species for Brazilian fish farming and is considered emerging in the global aquaculture. Despite its importance, no effective tool for evaluation of the adaptive immune response of this species has been developed. Therefore, this study aimed the development and standardization of indirect ELISA for the measurement of pacu antigen-specific antibodies using polyclonal rabbit anti-pacu IgM used as detector antibody. For this purpose was isolated and purificated of pacu IgM using mannose-binding protein affinity chromatography and produced specific polyclonal antibodies against heavy and light chains pacu IgM, that showed a molecular weight of 72 kDa and 26 kDa, respectively. Polyclonal antibodies obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ELISA; Immunoglobulin; Pacu`s immune system; Polyclonal antisera.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703327

Premaxillary crest variation within the Wukongopteridae (Reptilia, Pterosauria) and comments on cranial structures in pterosaurs
Provedor de dados: 42
Autores: CHENG,XIN; JIANG,SHUNXING; WANG,XIAOLIN; KELLNER,ALEXANDER W.A.
ABSTRACT Cranial crests show considerable variation within the Pterosauria, a group of flying reptiles that developed powered flight. This includes the Wukongopteridae, a clade of non-pterodactyloids, where the presence or absence of such head structures, allied with variation in the pelvic canal, have been regarded as evidence for sexual dimorphism. Here we discuss the cranial crest variation within wukongopterids and briefly report on a new specimen (IVPP V 17957). We also show that there is no significant variation in the anatomy of the pelvis of crested and crestless specimens. We further revisit the discussion regarding the function of cranial structures in pterosaurs and argue that they cannot be dismissed a priori as a valuable tool for species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wukongopteridae; Pterosauria; Cranial crest; Sexual dimorphism; China.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100119

Effects of acute and chronic physical exercise and stress on different types of memory in rats
Provedor de dados: 42
Autores: Mello,Pâmela Billig; Benetti,Fernando; Cammarota,Martín; Izquierdo,Iván.
Here we study the effect of acute and chronic physical exercise in a treadmill and of daily stress (because forced exercise involves a degree of stress) during 2 or 8 weeks on different types of memory in male Wistar rats. The memory tests employed were: habituation in an open field, object recognition and spatial learning in the Morris water maze. Daily foot-shock stress enhanced habituation learning after 2 but not after 8 weeks; it hindered both short- (STM) and long-term memory (LTM) of the recognition task at 2 weeks but only STM after 8 weeks and had no effect on spatial learning after either 2 or 8 weeks. Acute but not chronic exercise also enhanced habituation in the open field and hindered STM and LTM in the recognition task. Chronic exercise...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physical activity; Stress; Earning and memory; Forced running.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200008

Scientists in the public sphere: Interactions of scientists and journalists in Brazil
Provedor de dados: 42
Autores: MASSARANI,LUISA; PETERS,HANS P.
ABSTRACT In order to map scientists' views on media channels and explore their experiences interacting with journalists, the authors conducted a survey of about 1,000 Brazilian scientists. Results indicate that scientists have clear and high expectations about how journalists should act in reporting scientific information in the media, but such expectations, in their opinion, do not always seem to be met. Nonetheless, the results show that surveyed scientists rate their relation with the media positively: 67% say that having their research covered by media has a positive impact on their colleagues. One quarter of the respondents expressed that talking to the media can facilitate acquisition of more funds for research. Moreover, 38% of the total respondents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Interactions of scientists and journalists; Public communication of science and technology; Science communication; Science journalism.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301165

Morphology of the Diaphragm Muscle in Southern Tamandua (Tamandua tetradactyla) and its Importance in Cases of Traumatic Hernia
Provedor de dados: 42
Autores: AZEVEDO,ÉRICA F.S.; SILVA,DANIELA R. COSTA E; NATIVIDADE,TAMIRES V.S.; GIESE,ELANE G.; LIMA,ANA RITA DE; SOARES,PAOLA C.; BRANCO,ÉRIKA.
ABSTRACT The wall of the diaphragm can be affected by changes caused by physical trauma, allowing the passage of viscera between the abdominal cavity and thoracic cavity, thus reducing the space for pulmonary expansion, leading to the formation of hernia and possible death. Thus, we aimed to characterize, size and determine the topography of the diaphragmatic muscle in the Southern Tamandua, since clinical and surgical activities in wild animals have become a reality more and more present in veterinary medicine. We used six adult animals, x-rayed and dissected, followed by collection of fragments of muscular portions for histological analysis. Initially we observed that the animals presented 17 thoracic vertebrae, 3 lumbar vertebrae and 5 sacral vertebrae....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diaphragmatic hernia; Morphology; Tamandua tetradactyla; Xenarthra.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401845

Genetic and chemical diversity in seeds of cactus mandacaru (Cereus sp.) from two edaphoclimatic regions contrasting
Provedor de dados: 42
Autores: Bevilaqua,Maycon R.R.; Santana Filho,Arquimedes P.; Mangolin,Claudete A.; Oliveira,Arildo J.B.; Machado,Maria De Fátima P.S.
The purpose of this study was to evaluate the chemical, physiological and genetic differences in seeds of cactus of the Cereus genus (mandacaru) cultivated in the Northeast (Picos, State of Piauí) and Southern (Maringá, State of Paraná) regions of Brazil. Over a period of eight days, temperatures of 25°C and 30°C were equally efficient for the germination of all the seeds. Oleic acid (C18:1) was the most common fatty acid found in the seeds collected in the Southern (41%) and Northeast (45.5%) regions. The analysis of lipases indicated that seeds from Maringá have high mean observed and expected heterozygosities and that seeds from Picos have a higher number of alleles per loci. Therefore, the seeds of mandacaru from the semiarid region of Northeast as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactus; Cereus peruvianus; Cereus jamacaru; Seed germination; Fatty acids; Lipases; Genetic diversity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200765

Hypothalamic neurohormones regulate anterior pituitary neuromedin B expression
Provedor de dados: 42
Autores: ORTIGA-CARVALHO,TÂNIA MARIA; OLIVEIRA,KAREN DE JESUS; PAZOS-MOURA,CARMEN C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300034

Stress and sleep quality in high school brazilian adolescents
Provedor de dados: 42
Autores: Mesquita,Gema; Reimão,Rubens.
OBJECTIVE: The objective of the present study is to analyze the effect of stress on sleep quality in a group of adolescents. METHOD: Two high schools in Alfenas, southern Minas Gerais State, Brazil, were chosen to participate in the study. The sample consisted of both genders (n=160) with 65.63% females. The age range of participants was 15 to18 years. The Pittsburgh Sleep Quality Index (PSQI) was applied for collection of data to quantify sleep quality. The Lipp Inventory of Stress Symptoms that objectively identifies symptoms of stress was applied. RESULTS: It was observed that 23.53% of stressed students and 45.33% of unstressed ones sleep well; 76.47% of stressed pupils and 54.67% of those unstressed do not sleep well. With regard to school...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sleep; Sleep disorders; Stress; Sleep deprivation; Psychological symptoms.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200029

Transcolonic Perirectal NOTES Access (PNA): A feasibility study with survival in swine model
Provedor de dados: 42
Autores: OLIVEIRA,ANDRÉ L.A.; ZORRON,RICARDO; OLIVEIRA,FLAVIO M.M. DE; SANTOS JUNIOR,MARCELO B. DOS; SCHEFFER,JUSSARA P.; RIOS,MARCELO; ANTUNES,FERNANDA.
ABSTRACT Transrectal access still has some unsolved issues such as spatial orientation, infection, access and site closure. This study presents a simple technique to perform transcolonic access with survival in a swine model series. A new technique for NOTES perirectal access to perform retroperitoneoscopy, peritoneoscopy, liver and lymphnode biopsies was performed in 6 pigs, using Totally NOTES technique. The specimens were extracted transanally. The flexible endoscope was inserted through a posterior transmural incision and the retrorectal space. Cultures of bacteria were documented for the retroperitoneal space and intra abdominal cavity after 14 days. Rectal site was closed using non-absorbable sutures. There was no bowel cleansing, nor preoperative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rectal cancer; Total mesorectal excision; Colorectal surgery; Natural orifice surgery; Minimally invasive surgery.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200685

Chromitites associated with layered complexes in Brazil: testing "one-fit-all" genetic models
Provedor de dados: 42
Autores: FERREIRA-FILHO,CESAR F.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300044

Morphological variation of Aplectana hylambatis (Nematoda: Cosmocercidae) from different anuran hosts and localities in Argentina
Provedor de dados: 42
Autores: GONZÁLEZ,CYNTHYA E.; GÓMEZ,VALERIA I.; HAMANN,MONIKA I.
Abstract: Aplectana hylambatis is a nematode with a wide geographic distribution and low host specificity. In spite of numerous reports, until this moment, the morphological variations between different hosts and localities have not been studied. We studied 401 specimens collected from five host species from seven localities in Argentina, and examined the following morphological characters: mamelon-like cuticular protuberances anterior to the vulva, structure of the gubernaculum and the spicules, number and arrangement of caudal papillae, and the measurements of twelve characters in females and eleven characters in males. The results showed that mamelon-like protuberances and caudal papillae varied in number and arrangement between different hosts and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Cosmocercid nematodes; Intraspecific variability; Morphology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500615

New materials for photonic devices - hybrid systems and nanoscience
Provedor de dados: 42
Autores: SANTA-CRUZ,PETRUS A.
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300027

Anatomy and fructan distribution in vegetative organs of Dimerostemma vestitum (Asteraceae) from the campos rupestres
Provedor de dados: 42
Autores: Silva,Taiza M.; Vilhalva,Divina A.A.; Moraes,Moemy G.; Figueiredo-Ribeiro,Rita de Cássia L.
Among the compounds stored by plants, several functions are assigned to fructans, such as source of energy and protection against drought and extreme temperatures. In the present study we analyzed the anatomy and distribution of fructans in vegetative organs of Dimerostemma vestitum (Asteraceae), an endemic species from the Brazilian campos rupestres. D. vestitum has amphistomatic and pubescent leaves, with both glandular and non-glandular trichomes. In the basal aerial stem the medulla has two types of parenchyma, which differ from the apical portion. The xylopodium has mixed anatomical origin. Interestingly, although inulin-type fructans with high degree of polymerization were found in all analyzed organs except the leaves, the highest amount and maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Fructans; Inulin spherocrystals; Secretory structures; Xylopodium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200797

Karyotype characterization and nuclear DNA content measurement in Bromeliaceae: State of the art and future perspectives
Provedor de dados: 42
Autores: NUNES,ANDREI C.P.; CLARINDO,WELLINGTON R.
In Bromeliaceae, cytogenetic and flow cytometry analyses have been performed to clarify systematic and evolutionary aspects. Karyotyping approaches have shown the relatively high chromosome number, similar morphology and small size of the chromosomes. These facts have prevented a correct chromosome counting and characterization. Authors have established a basic chromosome number of x = 25 for Bromeliaceae. Recently, one karyomorphological analysis revealed that x = 25 is no longer the basic chromosome number, whose genome may have a polyploid origin. Besides cytogenetic characterization, the 2C DNA content of bromeliads has been measured. Nuclear DNA content has varied from 2C = 0.60 to 2C = 3.34 picograms. Thus, in relation to most angiosperms, the 2C DNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allopolyploid; Bromeliads; Cytogenetics; Flow cytometry; Genome evolution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401849

Sugarcane and cancer, scientometrics, and phytoplankton dynamics of a beach in the Amazon
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401177

Evaluation of ovarian structures using computerized microtomography
Provedor de dados: 42
Autores: PAULINI,FERNANDA; CHAVES,SACHA B.; RÔLO,JOSÉ LUIZ J.P.; AZEVEDO,RICARDO B. DE; LUCCI,CAROLINA M.
ABSTRACT Visualization and clear understanding of the ovarian structures are important in determining the stage of oestrus, helping to diagnose several pathologies and supporting advances in reproductive technologies. In this research, computerized microtomography (microCT) was used to explore and characterize the ovarian structure of seven mammalian species. Ovaries of rats, female dog, queens, cows, mares, sows and a female donkey were used. After microCT scanning, the same samples were prepared for histologic evaluation, used here as a validation criterion. It was possible to distinguish regions of the cortex and medulla, visualize the morphology and distribution of blood vessels, clearly observe corpus luteum and antral follicles, and visualize oocytes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovarian follicle; Blood vessels; Histology; Tomography; Ovary.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502131

Physical attributes of ultisol of Brazil's northeastern semiarid under organic farming of wine grapes
Provedor de dados: 42
Autores: Feitosa,Jardenia R.; Mendes,Alessandra M.S.; Olszevski,Nelci; Cunha,Tony J.F.; Cortez,Jorge W.; Giongo,Vanderlise.
The purpose of this study was to evaluate the effects of organic farming of wine grapes under physical and chemical characteristics of Ultisol Brazil's northeastern semiarid region. The samples of soil were collected from the row and interrow of the farming and from the fallow area, at the depths of 0.0-0.10, 0.10-0.20, 0.20-0.30 and 0.30-0.60 m. The samples were collected at six and twelve months after the culture implementation to evaluate the state of aggregation, bulk density and total soil porosity, flocculation index and organic matter contents, calcium, magnesium, and sodium. The results were submitted to statistical analysis. The adoption of organic farming contributed to the soil aggregation process. The bulk density and total soil porosity did...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregate stability; Organic farming; Soil quality; Vitiviniculture.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100483

Inhibition of Alzheimer's disease beta-amyloid aggregation, neurotoxicity and in vivo deposition
Provedor de dados: 42
Autores: FELICE,FERNANDA G. DE; HOUZEL,JEAN-CHRISTOPHE C.; GARCIA-ABREU,JOSÉ; LOUZADA,PAULO R.; AFONSO,ROSENILDE C.; MEIRELLES,MARIA NAZARÉ; LENT,ROBERTO; MOURA NETO,VIVALDO; FERREIRA,SERGIO T.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300018

Communities of P-solubilizing bacteria, fungi and arbuscular mycorrhizal fungi in grass pasture and secondary forest of Paraty, RJ - Brazil
Provedor de dados: 42
Autores: Souchie,Edson L.; Saggin-Júnior,Orivaldo J.; Silva,Eliane M.R.; Campello,Eduardo F.C.; Azcón,Rosario; Barea,Jose M.
Communities of P-solubilizing bacteria, fungi and arbuscular mycorrhizal fungi, were evaluated in two different ecosystems. Samplings taken from two areas of Atlantic forest, in Paraty - RJ, Brazil, one with a secondary forest and the other with a grass pasture were studied. Four growth media: GL (glucose and yeast extract), GES (glucose, soil extract, KNO3, CaCl2, MgSO4, NaCl, FeEDTA and micronutrients solution), GAGES (glucose, soil extract, arabinose, glycerol, CaCl2, MgSO4 and NaCl) and GELP (glucose, soil extract, yeast extract, peptone, CaCl2, MgSO4 and NaCl) were evaluated for the isolation of P-solubilizing microorganisms. The identification of P-solubilizing bacteria was based on 16 S rDNA sequence analysis, while the identification of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphate; Enterobacteriaceae; Atlantic Forest; Glomeromycota; Soil microorganisms.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100016

Sugars levels of four sugarcane genotypes in different stem portions during the maturation phase
Provedor de dados: 42
Autores: PEREIRA,LAÍS F.M.; FERREIRA,VILMA M.; OLIVEIRA,NELSON G. DE; SARMENTO,PEDRO L.V.S.; ENDRES,LAURÍCIO; TEODORO,IÊDO.
ABSTRACT Maturation is a characteristic of sugarcane plant (Saccharum spp.) and even when grown under the same soil and climate conditions the varieties differ on the maturation curve. Thus, studies that allow establishing maturation curves of different sugarcane genotypes in the local soil and climate may indicate the proper harvesting period to ensure better quality of the raw material. This study aimed to analyze the levels of soluble sugars during the maturation phase and assess the technological and productivity indexes of four irrigated sugarcane genotypes in the region of Rio Largo, Alagoas. The experiment was conducted in randomized blocks in a 4 x 2 x 5 factorial: four genotypes (RB92579, RB98710, RB99395 and RB961003), two stem portions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fructose; Glucose; Sucrose; Total soluble solid; Yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301231

Elaboration of garlic and salt spice with reduced sodium intake
Provedor de dados: 42
Autores: RODRIGUES,JÉSSICA F.; JUNQUEIRA,GABRIELA; GONÇALVES,CARLA S.; CARNEIRO,JOÃO D.S.; PINHEIRO,ANA CARLA M.; NUNES,CLEITON A.
Garlic and salt spice is widely used in Brazilian cookery, but it has a high sodium content; as high sodium intake has been strongly correlated to the incidence of chronic diseases. This study aimed to develop a garlic and salt spice with reduced sodium intake. Sensory evaluation was conducted by applying the spices to cooked rice. First, the optimal concentration of spice added during rice preparation was determined. Subsequently, seasonings (3:1) were prepared containing 0%, 50% and 25% less NaCl using a mixture of salts consisting of KCl and monosodium glutamate; a seasoning with a 0% NaCl reduction was established as a control. Three formulations of rice with different spices were assessed according to sensory testing acceptance, time-intensity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: KCl; Monosodium glutamate; TDS; TI.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402065

The Dasypodidae (Mammalia, Xenarthra) from the Urso Fóssil Cave (Quaternary), Parque Nacional de Ubajara, State of Ceará, Brazil: paleoecological and taxonomic aspects
Provedor de dados: 42
Autores: OLIVEIRA,PAULO V.; RIBEIRO,ANA MARIA; OLIVEIRA,ÉDISON V.; VIANA,MARIA SOMÁLIA S.
This paper deals with xenarthrans osteoderms assigned toDasypus aff. D. novemcinctus,Euphractus sexcinctus and Cabassous sp. The material was collected in subsurface, from 0.10 to 0.60 m in the Urso Fóssil Cave, Parque Nacional de Ubajara, State of Ceará, northeastern Brazil. The ages of sediment samples from levels 4 and 5 (depths of 0.40 and 0.50 m) were determined by thermoluminescence technique, and indicated ages of 8,000 and 8,200 years BP for each layer respectively. The presence in these layers of early Holocene xenarthrans taxa can contribute to the understanding of the biotic evolution of the northwest region of Ceará during the last 10,000 years. Two of the three identified taxa still occur in the region: Dasypus novemcinctus andEuphractus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammals; Dasypodidae; Holocene; Cave; Parque Nacional de Ubajara; Northeastern Brazil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100147

Feeding preference of Plutella xylostella for leaves treated with plant extracts
Provedor de dados: 42
Autores: COUTO,IRYS F.S.; FUCHS,MATEUS L.; PEREIRA,FABRÍCIO F.; MAUAD,MUNIR; SCALON,SILVANA P.Q.; DRESCH,DAIANE M.; MUSSURY,ROSILDA M.
ABSTRACT Plutella xylostella L. is one of the main agents to cause damages to plants of Brassica genus, provoking negative impacts in cultures. The use of botanical extracts in plants protection has been related in literature, however, their use in the species analyzed in this study is not yet reported. We assessed the effect of aqueous and methanolic extracts of the species: Schinus terebinthifolius Raddi (Pink Pepper), Annona coriacea Mart. (Araticum), Duguetia furfuracea (A. St.-Hil.) Benth. &amp; Hook. (Pindaúva do campo) and Trichilia silvatica C. DC. (Catiguá-branco), occuring in the state of Mato Grosso do Sul and whose feeding preference of P. xylostella larvae of 3rd instar. We intend to answer the following questions: (1) Are the plant species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona coriacea; Duguetia furfuracea; Feeding deterrence; Insecticidal plant; Schinus terebinthifolius; Trichilia silvatica.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501781

Determinants of HIV-1 mother-to-child transmission in Southern Brazil
Provedor de dados: 42
Autores: Martínez,Ana M.B.; Hora,Vanusa P. da; Santos,Adriana L. dos; Mendoza-Sassi,Raul; Von Groll,Andréa; Soares,Esmeralda A.J.M.; D'Ávila,Nildo; Silveira,Jussara; Leal,Renata G.; Tanuri,Amilcar; Soares,Marcelo A.
Different human immunodeficiency virus type 1 (HIV-1) subtypes may have distinct biological, immunological and pathogenic properties. Efficiency of mother-to-child transmission (MTCT) may be among those properties, but few and controversial results have been described so far. In this study, 102 children born from HIV-1-infected mothers between 1998 and 2004 in the city of Rio Grande, Brazil were analyzed for potential risk factors associated with MTCT. That geographic region is characterized by a high proportion of subtype C-infected subjects, and it allowed comparison between subtypes B and C and their influence on MTCT. The analysis also included clinical, obstetric and immunological parameters. Multivariate regression analyses were conducted to evaluate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV; MTCT; Vertical transmission; Subtype C; Molecular epidemiology.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100011

Comparative study on the biodegradation of chlorpyrifos-methyl by Bacillus megaterium CM-Z19 and Pseudomonas syringae CM-Z6
Provedor de dados: 42
Autores: ZHU,JIANGWEI; ZHAO,YAN; RUAN,HONGHUA.
Abstract: The strains CM-Z19 and CM-Z6, which are capable of highly degrading chlorpyrifos-methyl, were isolated from soil. They were identified as Bacillus megaterium CM-Z19 and Pseudomonas syringae CM-Z6, respectively, based on the 16S rRNA and an analysis of their morphological, physiological and biochemical characteristics. The strain CM-Z19 showed 92.6% degradation of chlorpyrifos-methyl (100 mg/L) within 5 days of incubation, and the strain CM-Z6 was 99.1% under the same conditions. In addition, the degradation characteristics of the two strains were compared and studied, and the results showed that the strain CM-Z19 had higher phosphoesterase activity and ability to degrade the organophosphorus pesticide than did the strain CM-Z6. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus megaterium; Pseudomonas syringae; Chlorpyrifos-methyl; 3; 5; 6-trichloro-2-pyridinol; Biodegradation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500624

Environmental changes in the western Amazônia: morphological framework, geochemistry, palynology and radiocarbon dating data
Provedor de dados: 42
Autores: Horbe,Adriana M.C.; Behling,Hermann; Nogueira,Afonso C.R.; Mapes,Russell.
The sediments from the Coari lake, a “terra firme” lake sculpted into Plio-Pleistocene deposits, and the Acará lake, a flooding-type lake developed on Quaternary sediments in the floodplain of the mid-Solimões river, in the western Amazônia, Brazil, were studied to investigate the environmental condition of their developing. This study includes mineral composition, geochemistry, Pb isotope, palinology, radiocarbon-age and morphological framework of the lakes obtained from SRTM satellite images. The geological and the environmental conditions in the two lakes are highly variable and suggest that their evolution reflect autogenic processes under humid rainforest condition. Although kaolinite, quartz, muscovite, illite, and smectite are the main minerals in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pb isotopes; Lacustrine environment; Paleovegetation; Flooding plain; Holocene.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300008

Thermal properties of metal-metal bonded Pd(I) complexes supported onto porous Vycor glass
Provedor de dados: 42
Autores: Gimenez,Iara F.; Alves,Oswaldo L.
Thermal behavior of the complexes Pd2(dppm)2Cl2, Pd2(dppm)2(SnCl3)Cl and Pd2(dppm)2(SnCl3)2 (dppm = bis[diphenylphosphino(methane)], ((C6H5)2PCH2P(C6H5)2) in the solid state and immobilized onto porous Vycor glass was studied. Similar decomposition mechanisms were observed for the solid and immobilized complexes, with a small thermal stabilization upon immobilization. The decomposition products were characterized by X-ray diffractometry, Raman and diffuse reflectance infrared spectroscopy, which indicated the presence of a mixture of metallic palladium and oxidized species such as PdO,condensed phosphates, SnO2 and SnP2O7. According to X-ray diffractometry, the decomposition products of the immobilized complexes presented higher amounts of PdO than the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palladium(I) complex; Porous Vycor glass; Bis[diphenylphosphino(methane)]; Thermogravimetric analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200004

Physiological response and productivity of safflower lines under water deficit and rehydration
Provedor de dados: 42
Autores: BORTOLHEIRO,FERNANDA P.A.P.; SILVA,MARCELO A.
ABSTRACT Water deficit is one of the major stresses affecting plant growth and productivity worldwide. Plants induce various morphological, physiological, biochemical and molecular changes to adapt to the changing environment. Safflower (Carthamus tinctorius L.), a potential oil producer, is highly adaptable to various environmental conditions, such as lack of rainfall and temperatures. The objective of this work was to study the physiological and production characteristics of six safflower lines in response to water deficit followed by rehydration. The experiment was conducted in a protected environment and consisted of 30 days of water deficit followed by 18 days of rehydration. A differential response in terms of photosynthetic pigments, electrolyte...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carthamus tinctorius L.; Drought physiology; Irrigation; Water use efficiency; Yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000603051

Metabolism and secretory function of white adipose tissue: effect of dietary fat
Provedor de dados: 42
Autores: Nascimento,Cláudia M. Oller do; Ribeiro,Eliane B.; Oyama,Lila M.
Approximately 40% of the total energy consumed by western populations is represented by lipids, most of them being ingested as triacylglycerols and phospholipids. The focus of this review is to analyze the effect of the type of dietary fat on white adipose tissue metabolism and secretory function, particularly on haptoglobin, TNF-α, plasminogen activator inhibitor-1 and adiponectin secretion. Previous studies have demonstrated that the duration of the exposure to the high-fat feeding, amount of fatty acid present in the diet and the type of fatty acid may or may not have a significant effect on adipose tissue metabolism. However, the long-term or short-term high fat diets, especially rich in saturated fatty acids, probably by activation of toll-like...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adipokines; High fat diets; Metabolism; White adipose tissue.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300010

Paleomagnetic constraints on the age of the Botucatu Formation in Rio Grande do Sul, southern Brazil
Provedor de dados: 42
Autores: Tamrat,Endale; Ernesto,Marcia.
Paleomagnetic and rockmagnetic data are reported for the aeolian Botucatu Formation, in the southern Brazilian State of Rio Grande do Sul. Oriented samples were taken from a section located between the cities of Jaguari and Santiago. After thermal and alternating field demagnetization, both normal and reversed characteristic remanent magnetizations were found. These results yielded 13 reversed and 5 normal polarity sites, composing a magnetostratigraphic column displaying a sequence of reversed-normal-reversed polarity events. The paleomagnetic pole calculated for 18 sites is located at 114.7ºE, 78.5ºS (dp=8.1º; dm=1.2º), after restoring the strata to the paleohorizontal. This paleomagnetic pole indicates a Late Jurassic-Early Cretaceous age to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleomagnetism; Botucatu Formation; Magnetostratigraphy; Magnetic anisotropy; Late Jurassic.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300016

Molecular characterization of the invasive aquatic macrophyte Hydrilla verticillata (Hydrocharitaceae) in Brazil
Provedor de dados: 42
Autores: LUCIO,LÉIA CAROLINA; THOMAZ,SIDINEI M.; PRIOLI,SÔNIA MARIA A.P.; BONI,TALGE A.; OLIVEIRA,ALESSANDRA V. DE; PRIOLI,ALBERTO JOSÉ.
Abstract: Invasive populations of macrophytes are widely distributed and have been successfully introduced and established in freshwater habitats. Hydrilla verticillata was first recorded in 2005 in the Upper Paraná River floodplain and in 2007 at the Itaipu Reservoir (Brazil-Paraguay border, ca. 300 km downstream from its first record). However, its genetic variability within different sites in South America is unknown. We used nucleotide sequences corresponding to the trnL-trnF fragment cpDNA to genetically characterize populations of H. verticillata in different ecosystems of the Upper Paraná River basin. The results indicated an absence of genetic differentiation within and between populations of the basin, and even individuals collected 600 km apart...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CpDNA; Genetic variability; TrnL-trnF; Upper Paraná River basin.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500623

Potentially mobile of heavy metals on the surface sediments in tropical hyper-saline and positive estuaries
Provedor de dados: 42
Autores: SILVA,CARLOS A. RAMOS E; FONSECA,ESTEFAN M. DA; GROTTO,BEATRIZ W.; SOUZA,FLAVO E.S. DE; BAPTISTA NETO,JOSÉ A.
ABSTRACT Estuarine sediments represent important pools of trace metals, released from both anthropogenic and natural sources. Fluctuations in the water column physicochemical conditions, on the other hand, may transfer metals from solid to liquid compartment and resulting in contamination of the surrounding environment. The present research was carried out to evaluate the weakly bounded heavy metal levels in tropical hyper-saline and positive estuaries, in order to quantify its potentially availability. The monitoring includes five metals (Cd, Cr, Cu, Pb, Zn) and cover nine estuaries in Rio Grande do Norte state/Brazil, including four hypersaline and five true estuaries. 50 surface sediment samples were collected in each estuary. At the same time, organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weakly bounded heavy metal; Hyper-saline waters; Positive estuaries; Surface sediment.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602597

Erratum to "Action of plant proteinase inhibitors on enzymes of physiopathological importance" [An Acad Bras Cienc 81(2009): 615-621]
Provedor de dados: 42
Autores: Oliva,Maria LuizA V.; Sampaio,Misako U.
Tipo: Info:eu-repo/semantics/other
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200016

From Medicinal Chemistry to Human Health: Current Approaches to Drug Discovery for Cancer and Neglected Tropical Diseases
Provedor de dados: 42
Autores: FERREIRA,LEONARDO G.; OLIVA,GLAUCIUS; ANDRICOPULO,ADRIANO D.
ABSTRACT Scientific and technological breakthroughs have compelled the current players in drug discovery to increasingly incorporate knowledge-based approaches. This evolving paradigm, which has its roots attached to the recent advances in medicinal chemistry, molecular and structural biology, has unprecedentedly demanded the development of up-to-date computational approaches, such as bio- and chemo-informatics. These tools have been pivotal to catalyzing the ever-increasing amount of data generated by the molecular sciences, and to converting the data into insightful guidelines for use in the research pipeline. As a result, ligand- and structure-based drug design have emerged as key pathways to address the pharmaceutical industry’s striking demands for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal chemistry; Ligand-based drug design; Structure-based drug design; Cancer; Neglected tropical diseases.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000200645

Shrimp U-Pb age and Sr-Nd isotopes of the Morro do Baú mafic intrusion: implications for the evolution of the Arenópolis volcano-sedimentary sequence, Goiás Magmatic Arc
Provedor de dados: 42
Autores: Pimentel,Márcio M.; Hollanda,Maria Helena B. M.; Armstrong,Richard.
The Arenópolis volcano-sedimentary sequence is located in the southern part of the Goiás Magmatic Arc and includes a ca. 900 Ma calc-alkaline arc sequence made of volcanic rocks ranging in composition from basalts to rhyolites, metamorphosed under greenschist to amphibolite facies. Small calc-alkaline gabbro to granite sub-volcanic bodies are also recognized. The Morro do Baú intrusion is the largest of these intrusions, and is made of gabbros and diorites. Zircon grains separated from one gabbro sample and analyzed by SHRIMP I yielded the mean 206Pb/238U age of 890 +/- 8 Ma, indicating that the intrusion is roughly coeval or only slightly younger than the Arenópolis volcanics. Contrary to the metavolcanics, which are juvenile, the Nd isotopic composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goiás Magmatic Arc; Arenópolis; U-Pb SHRIMP; Basic magmatism; Crustal contamination.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300006

Mineral supplementation stimulates the immune system and antioxidant responses of dairy cows and reduces somatic cell counts in milk
Provedor de dados: 42
Autores: WARKEN,AMANDA C.; LOPES,LEANDRO S.; BOTTARI,NATHIELI B.; GLOMBOWSKY,PATRÍCIA; GALLI,GABRIELA M.; MORSCH,VERA M.; SCHETINGER,MARIA ROSA C.; SILVA,ALEKSANDRO S. DA.
ABSTRACT The aim of this study was to evaluate whether the use of subcutaneous mineral supplementation would affect metabolic parameters, immunological response, milk quality and composition of dairy cows in the postpartum period. Twelve pregnant primiparous Holstein cows, were divided into two groups: six animals supplemented with the mineral complex (magnesium, phosphorus, potassium, selenium and copper), and six animals used as controls. Milk samples were collected every two other weeks postpartum up to sixty days of lactation to analyze composition and quality. Blood samples were collected, and the levels of ketone bodies, total proteins, glucose, albumin, and globulin were measured. The catalase and superoxide enzymes, reactive oxygen species, tumor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Ketone bodies; Mineral supplementation; Somatic cell count; Health.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401649

Non-coding RNAs in schistosomes: an unexplored world
Provedor de dados: 42
Autores: Oliveira,Katia C; Carvalho,Mariana L. P; Maracaja-Coutinho,Vinicius; Kitajima,João P; Verjovski-Almeida,Sergio.
Non-coding RNAs (ncRNAs) were recently given much higher attention due to technical advances in sequencing which expanded the characterization of transcriptomes in different organisms. ncRNAs have different lengths (22 nt to &gt;1, 000 nt) and mechanisms of action that essentially comprise a sophisticated gene expression regulation network. Recent publication of schistosome genomes and transcriptomes has increased the description and characterization of a large number of parasite genes. Here we review the number of predicted genes and the coverage of genomic bases in face of the public ESTs dataset available, including a critical appraisal of the evidence and characterization of ncRNAs in schistosomes. We show expression data for ncRNAs in Schistosoma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Non-coding RNAs; Gene expression profile; Genome; Transcriptome.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200026

Drought monitoring in the Brazilian Semiarid region
Provedor de dados: 42
Autores: ALVALÁ,REGINA C.S.; CUNHA,ANA PAULA M.A.; BRITO,SHEILA S.B.; SELUCHI,MARCELO E.; MARENGO,JOSÉ A.; MORAES,OSVALDO L.L.; CARVALHO,MAGOG A.
ABSTRACT Drought is a natural and recurrent phenomenon. It is considered ‘a natural disaster’ whenever it occurs in an intensive manner in highly populated regions, resulting in significant damage (material and human) and loss (socioeconomic). This paper presents the efforts developed to monitor the impact of drought in the semiarid region of Northeast Brazil. In this scope, information from different sources is compiled to support the evaluation and identification of impacted municipalities, with the main objective of supporting emergency actions to mitigate their impact. In the semiarid region of Brazil there are frequent occurrences of dry periods during the rainy season, which, depending on the intensity and duration, can cause significant damage to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Drought impacts; Drought monitoring; Semiarid; Dry farming; Northeast Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200502

Strawberry (Fragaria X ananassa Duch.) yiel das affected by the soil pH
Provedor de dados: 42
Autores: Milosevic,Tomo M.; Milosevic,Nebojsa T.; Glisic,Ivan P.
Two-year trials (20062007) suggested that the use of calcium oxide (CaO) on acid soils increased soil pH and yields in strawberry cultivars Marmolada, Selena and Senga Sengana, under the environmental conditions of Cacak (Western Serbia). The highest yield was obtained when CaO was applied at 750 kg ha-1 rate. Further increase in rate up to 1,500 kg ha-1 did not show corresponding increase in yield; the result was a slight yield drop compared to the peak yield shown at 750 kg ha¹ rate. Overall, yields at rates above 750 kg ha¹ were still higher than control and in the treatment employing lowest CaO application rate of 250 kg ha-1.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid soils; CaO; PH; Strawberry; Yield.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200012

On Huygens' principle for Dirac operators associated to electromagnetic fields
Provedor de dados: 42
Autores: CHALUB,FABIO A.C.C.
We study the behavior of massless Dirac particles, i.e., solutions of the Dirac equation with m = 0 in the presence of an electromagnetic field. Our main result (Theorem 1) is that for purely real or imaginary fields any Huygens type (in Hadamard's sense) Dirac operators is equivalent to the free Dirac operator, equivalence given by changes of variables and multiplication (right and left) by nonzero functions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Huygens' principle; Dirac operators; Electromagnetic fields; Hadamard's problem.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400002

High consumption of sucrose induces DNA damage in male Wistar rats
Provedor de dados: 42
Autores: FRANKE,SILVIA I.R.; MOLZ,PATRÍCIA; MAI,CAMILA; ELLWANGER,JOEL H.; ZENKNER,FERNANDA F.; HORTA,JORGE A.; PRÁ,DANIEL.
ABSTRACT The purpose of this study was to determine the effects of the high consumption of sucrose on the levels of DNA damage in blood, hippocampus and bone marrow of rats. Male Wistar rats were treated for 4 months with sucrose (10% for 60 initial days and 34% for the following 60 days) in drinking water, and then, glycemia and glycated hemoglobin (A1C) were measured. Levels of DNA damage in blood and hippocampus were evaluated by the comet assay. The micronucleus test was used to evaluate chromosomal damages in the bone marrow. The sucrose treatment significantly increased (p&lt;0.01) the serum glucose levels (~20%) and A1C (~60%). The level of primary DNA damage was significantly increased (p&lt;0.05) in hippocampal cells (~60%) but not in peripheral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Comet assay; Diabetes; DNA damage; Glycated hemoglobin; Micronucleus; Sucrose.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602657

Vascular epiphyte biomass in a South Brazilian fragment of Atlantic Forest
Provedor de dados: 42
Autores: PETEAN,MARISE P.; MARCON,AMANDA K.; LIEBSCH,DIETER; GALVÃO,FRANKLIN; KERSTEN,RODRIGO A.
Abstract The present study aimed at sampling the biomass of vascular epiphytes within a protected area in South Brazilian Atlantic Forest. All tree specimens with diameter at breast height equal or greater than 4.8 cm were measured and divided into classes. In each class, 10% of tree specimens were randomly selected for epiphytic biomass measuring. Furthermore, we divided the phorophytes into five tree parts to analyze epiphytic biomass. We generated mathematical models to estimate epiphytic biomass in similar forest areas. We analyzed 55 phorophytes and found an estimated epiphytic biomass of 5.3 Mg/ha. Epiphytic biomass ranged from 0.02 to 135 kg and the lower values were found on small-sized phorophytes. Higher values of epiphytic biomass were found on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass estimation; Carbon storage; Crown humus; Dead organic matter; Epiphytes; Epiphytic biomass.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703717

Degradation of song in a species using nesting holes: the Pied Flycatcher Ficedula hypoleuca
Provedor de dados: 42
Autores: Lampe,Helene M.; Dabelsteen,Torben; Larsen,Ole N.; Pedersen,Simon B.
The habitat, but also the nest hole of a hole-nesting species, will degrade the song during transmission. We investigated how the sounds degrade in a sound transmission experiment with the song of the Pied Flycatcher Ficedula hypoleuca (Muscicapidae). Ten different song elements were transmitted to microphones placed inside and outside a nest box. On average, song degradation was much greater inside than outside the nest boxes, especially with respect to excess attenuation and blurring of the song elements. Being inside a nest box therefore strongly reduces a Pied Flycatcher's possibility of detecting and recognizing songs or eavesdropping on singing interactions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sound degradation; Hole nesting; Pied Flycatcher; Ficedula hypoleuca.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200012

Exploiting gas diffusion for non-invasive sampling in flow analysis: determination of ethanol in alcoholic beverages
Provedor de dados: 42
Autores: Vicente,Simone; Zagatto,Elias A.G.; Pinto,Paula C.A.G.; Saraiva,Maria Lucia M.E.S.; Lima,José L.F.C.; Borges,Eduardo P.
A tubular gas diffusion PTFE membrane is exploited for non-invasive sampling in flow analysis, aiming to develop an improved spectrophotometric determination of ethanol in alcoholic beverages. The probe is immersed into the sample, allowing ethanol to diffuse through the membrane. It is collected into the acceptor stream (acidic dichromate solution), leading to formation of Cr(III), monitored at 600 nm. The analytical curve is linear up to 50% (v/v) ethanol, baseline drift is &lt; 0.005 absorbance during four working-hours, and sample throughput is 30 h-1, meaning 0.6 mmol K2Cr2O7 per determination. Results are precise (r.s.d.&lt; 2%) and in agreement with an official procedure.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flow-injection analysis; Ethanol determination; Gas diffusion; Semi-permeable membrane; UVVis spectrophotometry.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100004

Post-seminal development and morphoanatomy of vegetative and reproductive organs in Stevia rebaudiana (Bert.) Bertoni (Asteraceae)
Provedor de dados: 42
Autores: ROSSI,MÔNICA L.; SOUZA,EVERTON H.; GRANER,ERIKA M.; ALMEIDA,MARCÍLIO DE; MARTINELLI,ADRIANA P.
Abstract Stevia rebaudiana belongs to the Asteraceae family with high economic and medicinal potential. This article describes and illustrates morphological and histological aspects of leaves and reproductive organs, and the germination process, to provide detailed information on this species and to contribute to taxonomic, phylogenetic and pharmacobotanical projects. The fruit is a cypsela, small, simple, dry, indehiscent, monospermic, light or dark colored, with aristate pappus, and the seed presents a spatulate axile embryo. Germination is phaneroepigeal with a pivotal root system and many absorbing root hairs. The leaves are simple, elliptical to obovate, with two types of trichomes (glandular and tector), with a short petiole, exhibiting an opposite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Germination; Light microscopy; Morphology; Scanning electron microscopy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502167

Implementation of a geographic information system (GIS) for the planning of beekeeping in the west region of Paraná
Provedor de dados: 42
Autores: CAMARGO,SIMONE C.; GARCIA,REGINA C.; FEIDEN,ARMIN; VASCONCELOS,EDMAR S. DE; PIRES,BRUNO G.; HARTLEBEN,ALCEU M.; MORAES,FERNANDA J. DE; OLIVEIRA,LUAN DE; GIASSON,JUYVERSON; MITTANCK,EDUARDO S.; GREMASCHI,JEFERSON R.; PEREIRA,DIANA J.
This study aimed to develop a Geographic Information System (GIS), for storage of information and geographic location of apiaries in eight counties in western Paraná; study the local flora; the land used; and the honey productivity in the harvest of 2010 in two of these areas: Marechal Cândido Rondon and Santa Helena. In order to do so we used the software SPRING, delimiting a radius of action of bees of three kilometers around the apiaries. We interviewed and registered 126 beekeepers with 383 apiaries. By using the images we selected areas with greater and lower overlap of hives in Marechal Cândido Rondon (144 and 44 hives, respectively) and Santa Helena (165 and 40 hives, respectively), in a three kilometers radius, selecting 15 colonies in each area,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Biosecurity; Grouping; Honey; Planning.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200955

The influence of fire on the assemblage structure of foraging birds in grasslands of the Serra da Canastra National Park, Brazil
Provedor de dados: 42
Autores: Reis,Matheus G.; Fieker,Carolline Z.; Dias,Manoel M.
Grasslands are the most threatened physiognomies of the Cerrado biome (Brazilian savanna), a biodiversity hotspot with conservation as a priority. The Serra da Canastra National Park protects the most important remnants of the Cerrado's southern grasslands, which are under strong anthropogenic pressure. The present study describes the structure of bird assemblages that directly use food resources in burned areas, comparing areas affected by natural fire to the areas where controlled fires were set (a management strategy to combat arson). The tested null hypothesis was that different bird assemblages are structured in a similar manner, regardless of the post-fire period or assessed area. Between December/2012 and January/2015, 92 species were recorded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado biome; Diversity; Environmental management; Prescribed burning; Wildfire.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300891

Estimated atmospheric emissions from biodiesel and characterization of pollutants in the metropolitan area of Porto Alegre-RS
Provedor de dados: 42
Autores: Teixeira,Elba C.; Mattiuzi,Camila D.P.; Feltes,Sabrina; Wiegand,Flavio; Santana,Eduardo R.R.
The purpose of the present study was to estimate emissions of some pollutants (CO, NOX, HC, SOX, and PM) in diesel fleet due to the addition of biodiesel in different blends, as well as to assess atmospheric pollutant concentrations in the metropolitan area of Porto Alegre (MAPA). The methodology was based on inventories from mobile sources based on US EPA's technical report. Regarding air quality the following parameters were determined: PM10, PM2.5, CO, NOX, O3, SO2, HC and PAHs. The results showed a decrease for emissions PM, CO, and HC, and a slight increase for NOX. The characterization of atmospheric pollutants in the metropolitan area of Porto Alegre showed that they are influenced by mobile sources, particularly diesel vehicles. The diagnosis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air quality; Biodiesel; Diesel; Emissions.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300008

Science and technology to combat dengue virus
Provedor de dados: 42
Autores: Silva,Jerson L.; Oliveira,Andrea C.
Tipo: Info:eu-repo/semantics/article
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400001

Physicochemical characteristics and pollen spectra of organic and non-organic honey samples of Apis mellifera L.
Provedor de dados: 42
Autores: Sereia,Maria Josiane; Alves,Eloi M.; Toledo,Vagner AA.; Marchini,Luis C.; Serine,Elizabete S.; Faquinello,Patricia; Almeida,Daniela de; Moreti,Augusta C.C.C.
The aim of this research was to analyze and compare 17 honey samples, 11 organic and six non-organic Apis mellifera honey. The samples were analyzed concerning moisture, hydroxymethylfurfural, diastase index, water activity, color, total sugar, reducing sugar, sucrose, ash, viscosity, electrical conductivity, pH, acidity, and formol index. With the exception of acidity, reducing sugar and diastase index, the averages of other parameters were different between the two groups. All samples of organic honey presented moisture values between 23.50 and 24.40%. Among the nonorganic honey samples, two presented apparent sucrose amount upper the maximum limit established by the Brazilian Legislation. According to the quantitative analysis of pollen sediments in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Honey characterization; Melissopalynology; Organic honey; Physicochemical analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300026

Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin)
Provedor de dados: 42
Autores: Jasper,André; Ricardi-Branco,Fresia; Guerra-Sommer,Margot.
A new taxon of conifers (Coricladus quiteriensis) is described based on megafloristic remains from the roofshale level at the Quitéria Outcrop (Rio Bonito Formation - Lower Permian - Southern Paraná Basin - Rio Grande do Sul - Brazil). This megafloristic community is included in the Botrychiopsis Zone - Botrychiopsis valida Sub-Zone (Kungurian/Roadian). The assemblage, preserved as impressions, do not present remains of epidermic characters, and is composed mainly of isolated vegetative branches with spirally disposed acicular leaves, presenting a conspicuous central vein and also isolated fertile branches with sparse and irregular leaves and terminal cones. Leafless principal branches, organically connected with sterile and fertile branches, are rare....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coricladus quiteriensis; Paleobotany; Taxonomy; Coniferopsida; Gondwana; Lower Permian.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100012

Summer feeding ecology of Great Pampa-finches, Embernagra platensis at Laguna de Guaminí, Buenos Aires, Argentina
Provedor de dados: 42
Autores: Ferman,Laura M.; Montalti,Diego.
The aim of this study was to assemble data on the summer feeding ecology of the Great Pampa-finch, Embernagra platensis at the Laguna de Guaminí, Buenos Aires, Argentina, and to explore the differences related to the dietary patterns for each sex between winter and summer when possible. The stomach contents of 43 birds were analyzed. The animal fraction was composed of Hymenoptera (45.1%), Coleoptera (32.4%), Lepidoptera (6.0%), Araneae (5%) and Orthoptera (3.2%). The application of the index of relative importance (IRI) resulted in 1490.4 for Coleoptera, 428.5 for Hymenoptera and 162.5 for Lepidoptera caterpillars. The vegetal fraction consisted of Triticum aestivum (26.9%), Cyperaceous (25%), Poaceae (Gramineae) (19.3%) and Panicum sp. (11.2%). The IRI...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Embernagra platensis; Feeding ecology; Great Pampa-finch.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300014

Microcirculation in obesity: an unexplored domain
Provedor de dados: 42
Autores: Wiernsperger,Nicolas; Nivoit,Pierre; Bouskela,Eliete.
Obesity is traditionally linked to diabetes and cardiovascular diseases. Very recent experimental, clinical and epidemiological, sometimes provocative, data challenge this automaticity by showing that not the amount but the distribution of fat is the important determinant. Moderate abdominal fat accumulation may thus be more harmful than even consequent overweight. In view of the worldwide burden of obesity, factors leading to it in children and young adults must urgently be identified. Since obesity is a very complex cardiometabolic situation, this will require to focus investigations on uncomplicated obese subjects and adequate animal models. The recent discovery of intergenerational transmissions of obesity risk factors and also the key role played by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular disease; Diabetes mellitus; Birth weight; Metabolic syndrome; Leptin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400005

First record of dorsal and anal fin deformities in blue tang Acanthurus coeruleus (Acanthuridae, Actinopterygii) from northeastern Brazil
Provedor de dados: 42
Autores: BRITO,CAMILA CRISTINA P. DE; ARAÚJO,JÚLIO L.; MÁRQUEZ-VELÁSQUEZ,VIVIANA; SILVA,MARIANNA B. DA; ROSA,RICARDO S.
Abstract: Dorsal and anal fin deformities in the blue tang Acanthurus coeruleus are reported for the first time from northeastern Brazil, based on observations during research dives at an artificial reef. Possible causative factors are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acanthuridae; Bony fish; Fins; Morphological deformities.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700615

Environmental diagnosis of metals in streams near sugarcane cultivation areas: current and historical analysis in the central region of the State of São Paulo
Provedor de dados: 42
Autores: CORBI,JULIANO J.; COSTA,CAMILA G.; GORNI,GUILHERME R.; COLOMBO,VANESSA; RIOS,LEONARDO.
Abstract In Brazil, innumerable regions of native landcover have been removed and replaced by agricultural cultivation, especially of sugarcane. In this culture, the application of fertilizers containing metals has caused impacts on the water resources causing contamination of stream sediments and occasioning bioaccumulation of metals in aquatic invertebrates. In the year of 2006, an environmental diagnosis of metals in sediments of streams located near sugarcane cultivation areas and in streams located in preserved areas, was published. That study pointed to high concentrations of metals in stream sediments in agricultural areas. These streams have been monitored over the last 10 years conducting analyses of metals and monitoring possible changes in land...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic biota; Aquatic invertebrates; Fertilizers; Riparian vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602711

Short- and long-term memory: differential involvement of neurotransmitter systems and signal transduction cascades
Provedor de dados: 42
Autores: VIANNA,MÔNICA R.M.; IZQUIERDO,LUCIANA A.; BARROS,DANIELA M.; WALZ,ROGER; MEDINA,JORGE H.; IZQUIERDO,IVÁN.
Since William James (1890) first distinguished primary from secondary memory, equivalent to short- and long-term memory, respectively, it has been assumed that short-term memory processes are in charge of cognition while long-term memory is being consolidated. From those days a major question has been whether short-term memory is merely a initial phase of long-term memory, or a separate phenomena. Recent experiments have shown that many treatments with specific molecular actions given into the hippocampus and related brain areas after one-trial avoidance learning can effectively cancel short-term memory without affecting long-term memory formation. This shows that short-term memory and long-term memory involve separate mechanisms and are independently...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Short-term memory; Long-term memory; Hippocampus; PKA; PKC; MAPK.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300009

Diet, sexual dimorphism and reproduction of sympatric racers Philodryas aestiva and Philodryas patagoniensis from the coastal Brazilian Pampa
Provedor de dados: 42
Autores: QUINTELA,FERNANDO M.; LOEBMANN,DANIEL.
Abstract: Herein we investigated diet, sexual dimorphism and reproductive biology of two sympatric congeneric species at the coastal Brazilian Pampa, Philodryas aestiva and P. patagoniensis. Analysis of the stomach content of the scansorial Philodryas aestiva revealed that it feeds mainly on Anura and small mammals, while it occasionally consumes Insecta, Squamata and Aves. The more terrestrial Philodryas patagoniensis presented a broader diet, composed mainly of Anura, Squamata and small mammals. Insecta and Actinopterygii were found in lower frequencies. In females of both species, snout-vent length was significantly larger than in males, while tail length/snout-vent length ratio was significantly higher in males. Males reach sexual maturity at smaller...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding habits; Natural history; Neotropical snakes; Fecundity; Reproductive cycle.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100633

Melipona mondury produces a geopropolis with antioxidant, antibacterial and antiproliferative activities
Provedor de dados: 42
Autores: SANTOS,TÁSSIA L.A. DOS; QUEIROZ,RAPHAEL F.; SAWAYA,ALEXANDRA C.H.F.; LOPEZ,BEGOÑA GIMENEZ-CASSINA; SOARES,MILENA B.P.; BEZERRA,DANIEL P.; RODRIGUES,ANA CAROLINA B.C.; PAULA,VANDERLÚCIA F. DE; WALDSCHMIDT,ANA MARIA.
ABSTRACT Geopropolis is a special type of propolis produced by stingless bees. Several pharmacological properties have been described for different types of geopropolis, but there have been no previous studies of the geopropolis from Melipona mondury. In this study, we investigated the antioxidant, antibacterial, and antiproliferative activities of M. mondury geopropolis, and determined its chemical profile. The antioxidant activity was determined using in vitro ABTS·+, ·DPPH, and β-carotene/linoleic acid co-oxidation methods. The antibacterial activity was determined using a microdilution method with Pseudomonas aeruginosa, Staphylococcus aureus, and methicillin-resistant S. aureus. The antiproliferative effect was determined in tumor cell lines using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial; Antioxidant; Antiproliferative; Geopropolis; Melipona mondury.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502247

L      2 harmonic forms and finiteness of ends
Provedor de dados: 42
Autores: ZHU,PENG.
In this paper, we obtain vanishing theorems and finitely many ends theorems of complete Riemannian manifolds with weighted Poincaré inequality, applying them to minimal hypersurfaces.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: End; Minimal hypersurface; Weighted Poincare inequality; L      2 harmonic forms; Complete manifolds.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200457

Action of Aqueous Extracts of Phyllanthus niruri L. (Euphorbiaceae) leaves on Meristematic Root Cells of Allium cepa L.
Provedor de dados: 42
Autores: NEVES,ERASMOVLANE S.B.; FERREIRA,PAULO MICHEL PINHEIRO; LIMA,LEONARDO H.G.M.; PERON,ANA PAULA.
This study aimed to evaluate the effects of aqueous extracts of dried Phyllanthus niruri L. (stonebreaker) leaves on Allium cepa L. root meristem cells at four concentrations, 0.02 (usual concentration), 0.04, 0.06 and 0.08mg/mL and exposure times of 24 and 48 hours. For each concentration we used a group of five onion bulbs that were first embedded in distilled water and then transferred to their respective concentrations. The radicles were collected and fixed in acetic acid (3:1) for 24 hours. The slides were prepared by the crushing technique and stained with 2% acetic orcein. Cells were analyzed throughout the cell cycle, totaling 5000 for each control and exposure time. The calculated mitotic indices were subjected to the Chi-squared statistical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plant; Stonebreaker; Cell division; Cellular aberrations; Allium cepa.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301131

Morpho-anatomical features of underground systems in six Asteraceae species from the Brazilian Cerrado
Provedor de dados: 42
Autores: Appezzato-da-Glória,Beatriz; Cury,Graziela.
In the Brazilian Cerrado (neotropical savanna), the development of bud-bearing underground systems as adaptive structures to fire and dry periods can comprise an important source of buds for this ecosystem, as already demonstrated in the Brazilian Campos grasslands and North American prairies. Asteraceae species from both woody and herbaceous strata have subterranean organs that accumulate carbohydrates, reinforcing the adaptive strategy of these plants to different environmental conditions. This study aims to analyse the morpho-anatomy of underground systems of six species of Asteraceae (Mikania cordifolia L.f. Willd., Mikania sessilifolia DC, Trixis nobilis (Vell.) Katinas, Pterocaulon alopecuroides (Lam.) DC., Vernonia elegans Gardner and Vernonia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Buds; Compositae; Fructans; Stem tuber; Xylopodium.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300017

A new squamate lizard from the Upper Cretaceous Adamantina Formation (Bauru Group), São Paulo State, Brazil
Provedor de dados: 42
Autores: Nava,William R.; Martinelli,Agustín G.
The record of non-mosasaur squamates (Reptilia, Squamata) is sparse in the Cretaceus fossil record of Brazil and include six putative reports, three from the Aptian-Albian of the Araripe Basin (Tijubina pontei Bonfim-Júnior and Marques, Olindalacerta brasiliensis Evans and Yabumoto, and a lizard indet.) and three from the Upper Cretaceous of the Bauru Group (Pristiguana brasiliensis Estes and Price, Anilioidae gen. et sp. indet., and Squamata gen. et sp. indet.). In this contribution, a new genus and species of lizard, Brasiliguana prudentis gen. et sp. nov., is described based on an isolated left maxilla with teeth. The material was discovered in an outcrop of the Upper Cretaceous Adamantina Formation (Bauru Group) located in the proximity of Presidente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bauru Group; Brazil; Iguania; Late Cretaceous; Squamata.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100017

C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry
Provedor de dados: 42
Autores: Silva,Juan C.; Sial,Alcides N.; Ferreira,Valderez P.; Pimentel,Márcio M.
C-isotope and 87Sr/86Sr values for five carbonate successions from the São Caetano Complex, northeastern Brazil, were used to constrain their depositional age and to determine large variations in the C- and Sr-isotopic composition of seawater under the framework of global tectonic events. Three C-isotope stages were identified from base to top in a composed chemostratigraphic section: (1) stage in which delta13C values vary from +2 to +3.7‰ PDB and average 3‰ PDB, (2) stage with delta13C values displaying stronger oscillations (from -2‰ to +‰ PDB), and (3) stage with an isotopic plateau with values around +3.7‰ PDB. Constant 87Sr/86Sr values (~ 0.70600) characterize C-isotope stage 1, whereas slightly fluctuating values (from 0.70600 to 0.70700)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C-isotopes; Meso-Neoproterozoic; Chemostratigraphy; Borborema Province; Northeastern Brazil.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100011

Tmesiphantes hypogeussp. nov. (Araneae, Theraphosidae), the first troglobitic tarantula from Brazil
Provedor de dados: 42
Autores: Bertani,Rogério; Bichuette,Maria Elina; Pedroso,Denis R.
A new species of Tmesiphantes Simon, 1892, is described from sandstone/quartizitic caves of Chapada Diamantina, Bahia State, Brazil. This is the fifth species of the genus and the first record of a troglobitic mygalomorph in Brazil. A key is presented for all Tmesiphantes species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cave; Mygalomorph; New species; Spider taxonomy; Tarantula.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100235

The Complex Link between Apoptosis and Autophagy: a Promising New Role for RB
Provedor de dados: 42
Autores: DELOU,JOÃO M.A.; BIASOLI,DEBORAH; BORGES,HELENA L.
ABSTRACT Physiological processes, as autophagy, proliferation and apoptosis are affected during carcinogenesis. Restoring cellular sensitivity to apoptotic stimuli, such as the antineoplastic cocktails, has been explored as a strategy to eliminate cancer cells. Autophagy, a physiological process of recycling organelles and macromolecules can be deviated from homeostasis to support cancer cells survival, proliferation, escape from apoptosis, and therapy resistance. The relationship between autophagy and apoptosis is complex and many stimuli can induce both processes. Most chemotherapeutic agents induce autophagy and it is not clear whether and how this chemotherapy-induced autophagy might contribute to resistance to apoptosis. Here, we review current...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Retinoblastoma; Neoplasm; Autophagy; Cell death; Antineoplastic agents.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602257

Air quality assessment in different urban areas from Rio Grande do Sul state, Brazil, using lichen transplants
Provedor de dados: 42
Autores: KOCH,NATÁLIA MOSSMANN; LUCHETA,FABIANE; KÄFFER,MÁRCIA ISABEL; MARTINS,SUZANA MARIA DE AZEVEDO; VARGAS,VERA MARIA FERRÃO.
Abstract Based on the need to monitor air pollution and on the importance of doing it with biological organisms, the present work had as main objective to assess air quality in urban areas through lichen transplants. Besides, we also tested whether there were differences among the studied sites, aiming to point out the main pollution characteristics of the areas. The monitoring was carried out in seven cities, which varied from mainly rural to mainly industrial, in Rio Grande do Sul, southern Brazil. The foliose lichen Parmotrema tinctorum was used as the biomonitor species. Physiological tests and contents of sulphur and heavy metals were measured in the lichen thalli. Other pollutants assessed through air samplers were available for some cities, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution; Biomonitoring; Greenhouse gases; Heavy metals; Lichenized fungi; Particulate matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502233

Bioaccumulation of mercury, cadmium, zinc, chromium, and lead in muscle, liver, and spleen tissues of a large commercially valuable catfish species from Brazil
Provedor de dados: 42
Autores: Arantes,Fábio P.; Savassi,Lourenço A.; Santos,Hélio B.; Gomes,Marcos V.T.; Bazzoli,Nilo.
The increasing amounts of heavy metals entering aquatic environments can result in high accumulation levels of these contaminants in fish and their consumers, which pose a serious risk to ecosystems and human health. We investigated the concentrations of mercury (Hg), cadmium (Cd), zinc (Zn), chromium (Cr), and lead (Pb) in muscle, liver, and spleen tissues of Pseudoplatystoma corruscans specimens collected from two sites on the Paraopeba River, Brazil. The level of heavy metals concentrations in the tissues was often higher in viscera (i.e. liver and spleen) than in muscle, and thus, the viscera should not be considered for human consumption. Correlations between metal concentrations and fish size were not significant. Although the levels of muscle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Freshwater fish; Heavy metal; Human health.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100137

Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine
Provedor de dados: 42
Autores: SILVA,PAULO A.S.F.; OLIVEIRA,TAYGOARA F. DE; BRASIL JUNIOR,ANTONIO C.P.; VAZ,JERSON R.P.
ABSTRACT Over the years most studies on wake characteristics have been devoted to wind turbines, while few works are related to hydrokinetic turbines. Among studies applied to rivers, depth and width are important parameters for a suitable design. In this work, a numerical study of the wake in a horizontal-axis hydrokinetic turbine is performed, where the main objective is an investigation on the wake structure, which can be a constraining factor in rivers. The present paper uses the Reynolds Averaged Navier Stokes (RANS) flow simulation technique, in which the Shear-Stress Transport (SST) turbulent model is considered, in order to simulate a free hydrokinetic runner in a typical river flow. The NREL-PHASE VI wind turbine was used to validate the numerical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrokinetic turbines; Wake characteristics; CFD; Turbulence.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602441

Phenolic compounds and anticancer activity of commercial sugarcane cultivated in Brazil
Provedor de dados: 42
Autores: ALVES,VANESSA G.; SOUZA,ALAN G.; CHIAVELLI,LUCAS U.R.; RUIZ,ANA L.T.G.; CARVALHO,JOÃO E.; POMINI,ARMANDO M.; SILVA,CLEUZA C.
ABSTRACT The cultivation of sugarcane hybrids (X Saccharum officinarum L.) is an important revenue source for the Brazilian economy. Herein it is reported the evaluation of the cytotoxic activity of mid-polarity sugarcane extracts against human cancer cell lines, as well as the isolation of steroids sitosterol, stigmasterol and campesterol, phenolic acids p-hydroxybenzoic, p-hydroxycinnamic, vanillic and ferulic acid, terpenoids α-tocopherol and β-carotene and a novel substance in sugarcane, the flavonoid aglycone tricin (5,7,4-trihydroxy-3,5-dimethoxyflavone). The presence of large amounts of phenolic acids and the flavonoid tricin may explain the cytostatic activity observed for the mid-polarity crude extract and filtrates.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anticancer activity; Phenolic compounds; Saccharum officinarum L.; Sugarcane.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401201

Surface modification of activated carbon by corona treatment
Provedor de dados: 42
Autores: PEGO,MATHEUS F.F.; BIANCHI,MARIA LÚCIA; CARVALHO,JANAÍNA A.; VEIGA,TAIS R.L.A.
Surface modification may lead activated carbon (AC) to take on different properties. This study aimed to promote surface modification of activated carbons using corona treatment (electrical discharge). In this study, powdered commercial activated carbon was used. Activated carbons were subjected to corona treatment at different exposure times (2, 5, 8 and 10 min) at 4.5 cm height from the source. To observe differences promoted by treatment, activated carbons were analyzed by acidity, surface functional groups, Fourier Transform Infrared Spectroscopy (FTIR), elemental analysis (CHN), proximate analysis and thermogravimetry. Corona treatment impacted surface chemistry of activated carbons. There was a trend of increasing surface acidity according to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical reactions; Electric discharge; Oxidation; Surface chemistry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100402

Rules of song development and their use in vocal interactions by birds with large repertoires
Provedor de dados: 42
Autores: Geberzahn,Nicole; Hultsch,Henrike.
Songbirds are well known for settling their disputes by vocal signals, and their singing plays a dominant role. Most studies on this issue have concentrated on bird species that develop and use small vocal repertoires. In this article we will go farther and focus on examples of how species with large song repertoires make use of their vocal competence. In particular, we will outline the study of interaction rules which have been elucidated by examining time- and pattern-specific relationships between signals exchanged by territorial neighbors. First we present an inquiry into the rules of song learning and development. In birds with large song repertoires, the ontogeny of such rules proceeds along a number of trajectories which help in understanding the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Song development; Developmental trajectories; Interaction by song; Vocal duels; Common Nightingale.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200004

Use of the correlation coefficient in agricultural sciences: problems, pitfalls and how to deal with them
Provedor de dados: 42
Autores: Kozak,Marcin; Krzanowski,Wojtek; Tartanus,MaŁgorzata.
This paper discusses a number of aspects concerning the analysis, interpretation and reporting of correlations in agricultural sciences. Various problems that one might encounter with these aspects are identified, and suggestions of how to overcome these problems are proposed. Some of the examples presented show how mistaken and even misleading the interpretation of correlation can be when one ignores simple rules of analysis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental design; Linearity; Path analysis; Simpson's paradox; Statistical analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400029

U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration
Provedor de dados: 42
Autores: Chemale Jr,Farid; Kawashita,Koji; Dussin,Ivo A.; Ávila,Janaína N.; Justino,Dayvisson; Bertotti,Anelise.
The LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MC-ICP-MS; SHRIMP; Faraday cups; Multi-ion Counting System; U-Pb in situ zircon dating.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005

Effect of Syzygium cumini leaves on laying hens performance and egg quality
Provedor de dados: 42
Autores: FREITAS,EDNARDO R.; FERNANDES,DANILO R.; SOUZA,DAVYD H.; DANTAS,FRANCISCO D.T.; SANTOS,REBECA C.; OLIVEIRA,GILSON B.; CRUZ,CARLOS EDUARDO B.; BRAZ,NÁDIA M.; CÂMARA,LORENA F.; NASCIMENTO,GERMANO A.J.; WATANABE,PEDRO H.
ABSTRACT The aim of this study was to evaluate the effect of Syzygium cumini leaves (SCL) in laying hens diets on productive performance, egg quality and lipid oxidation of yolk. A total of 108 Hysex White laying hens were distributed in a completely randomized design with three treatments and six replicates of six birds each. The treatments consisted of SCL inclusion at dietary levels of 0, 5 and 10 g/kg. There was no significant effect of SCL inclusion on feed intake, laying percentage, weight and egg mass, feed conversion ratio, Haugh units, specific gravity, percentage of yolk, albumen and egg shells and shell thickness. However, the inclusion of SCL significantly influenced the yolk color and yolk lipid oxidation measured by TBARS values. Yolk color...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Egg quality; Phytogenic additives; Yolk color.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502479

Synopsis of Dorstenia (Moraceae) in Rio Grande do Sul, Southern Brazil
Provedor de dados: 42
Autores: Boeni,Bruna De Oliveira; Singer,Rodrigo Bustos.
A taxonomic synopsis of Dorstenia (Moraceae) in Rio Grande do Sul (RS), Southern Brazil, is presented. Three species were recorded: D. brasiliensis, D. carautae, a new record for the state of RS, and D. tenuis. All species are described and illustrated through detailed photos of living specimens. A taxonomic key to separate the species, as well as details on distribution, overall phenology, habitat, conservation status and ecology are presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emygdioa; Lecanium; Morphology; South-America; Taxonomy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200925

Infinitesimal Hartman-Grobman Theorem in Dimension Three
Provedor de dados: 42
Autores: ALONSO-GONZÁLEZ,CLEMENTA.
ABSTRACTIn this paper we give the main ideas to show that a real analytic vector field in R3 with a singular point at the origin is locally topologically equivalent to its principal part defined through Newton polyhedra under non-degeneracy conditions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vector fields; Singularities; Topological type; Newton polyhedron; Principal part.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401499

Coral-based climate records from tropical South Atlantic: 2009/2010 ENSO event in C and O isotopes from Porites corals (Rocas Atoll, Brazil)
Provedor de dados: 42
Autores: Pereira,Natan S.; Sial,Alcídes N.; Kikuchi,Ruy K.P.; Ferreira,Valderez P.; Ullmann,Clemens V.; Frei,Robert; Cunha,Adriana M.C.
ABSTRACT Coral skeletons contain records of past environmental conditions due to their long life span and well calibrated geochemical signatures. C and O isotope records of corals are especially interesting, because they can highlight multidecadal variability of local climate conditions beyond the instrumental record, with high fidelity and sub-annual resolution. Although, in order to get an optimal geochemical signal in coral skeleton, sampling strategies must be followed. Here we report one of the first coral-based isotopic record from the Equatorial South Atlantic from two colonies of Porites astreoides from the Rocas Atoll (offshore Brazil), a new location for climate reconstruction. We present time series of isotopic variation from profiles along the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coral; Climate change; Rocas Atoll; Carbon and oxygen isotopes; South Atlantic Ocean.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501939

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina
Provedor de dados: 42
Autores: ALIOTTA,SALVADOR; GINSBERG,SILVIA S.; GIAGANTE,DARÍO; VECCHI,LAURA G.; SALVATIERRA,MARTA M.
The Bahía Blanca estuary (Argentina) has a morphological configuration resulting from hydrological and sedimentary processes related to Late Quaternary sea level changes. This estuarine system occupies a large coastal plain with a dense net of tidal channels, low-altitude islands and large intertidal flats. Little is known about the sedimentary units of the marine subbottom. Therefore, a stratigraphical analysis of the northern coast of Bahía Blanca estuary was carried out using high resolution seismic (3.5 kHz) in order to: i) define Quaternary sequences, ii) describe sedimentary structures, and iii) determine the paleoenvironmental conditions of sedimentation. The seismic stratigraphic data collected and their correlation with drilling lithological data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahía Blanca estuary; Deltaic sequences; Marine seismic; Pleistocene; Stratigraphy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200649

Morphology and ultrastructure of megaspores and microspores of Isoetes sehnemii Fuchs (Lycophyta)
Provedor de dados: 42
Autores: Macluf,Cecilia; Morbelli,Marta; Giudice,Gabriela.
The morphology and wall ultrastructure of megaspores and microspores of Isoetes sehnemii that grows in Brazil were analyzed as part of the study of the Isoetaceae present in Southern South America. The observations were performed with light, scanning and transmission electron microscopes. The megaspores are trilete, 350-450μm in equatorial diameter. The surface is reticulate. In section, the sporoderm is 100μm thick including the ornamentation. The wall is composed of a siliceous perispore, which consists of short fused flatten, elements forming a three-dimensional mesh. The exospore has two zones of different structure. The endospore is fibrillar. The microspores are monolete, 21-27μm in equatorial diameter. The sporoderm is composed of a sporopollinic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycophyta; Isoetes; Brazil; Spores; Ultrastructure; Sculpture; Palynology.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200010

Heparan sulfate proteoglycans: structure, protein interactions and cell signaling
Provedor de dados: 42
Autores: Dreyfuss,Juliana L.; Regatieri,Caio V.; Jarrouge,Thais R.; Cavalheiro,Renan P.; Sampaio,Lucia O.; Nader,Helena B.
Heparan sulfate proteoglycans are ubiquitously found at the cell surface and extracellular matrix in all the animal species. This review will focus on the structural characteristics of the heparan sulfate proteoglycans related to protein interactions leading to cell signaling. The heparan sulfate chains due to their vast structural diversity are able to bind and interact with a wide variety of proteins, such as growth factors, chemokines, morphogens, extracellular matrix components, enzymes, among others. There is a specificity directing the interactions of heparan sulfates and target proteins, regarding both the fine structure of the polysaccharide chain as well precise protein motifs. Heparan sulfates play a role in cellular signaling either as receptor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycosaminoglycans and protein interactions; Growth factors; Focal adhesion; Extracellular matrix; Cell cycle; Cell proliferation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300007

Lecithotrophic behaviour in zoea and megalopa larvae of the ghost shrimp Lepidophthalmus siriboia Felder and Rodrigues, 1993 (Decapoda: Callianassidae)
Provedor de dados: 42
Autores: Abrunhosa,Fernando A.; Simith,Darlan J.B.; Palmeira,Carlos A.M.; Arruda,Danielle C.B.
Food supply is considered critical for a successful culturing of decapod larvae. However, some species may present yolk reserve sufficient to complete their larval development without external food supply (known as lecithotrophic larval development). In the present study, two experiments were carried out in order to verify whether the callianassid Lepidophthalmus siriboia have lecithotrophic behaviour or, if they need external food for their larval development: Experiment 1, larvae submitted to an initial feeding period and Experiment 2, larvae submitted to an initial starvation period. High survival rate was observed in both experiments, in which only 2 megalopae and 1 zoea III died. These results strongly suggest that larvae of L. siriboia are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behaviour; Callianassidae; Larval development; Lecithotrophy; Lepidophthalmus siriboia; Starvation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400005

In vitro antifungal activity of Myracrodruon urundeuva Allemão against human vaginal Candida species
Provedor de dados: 42
Autores: OLIVEIRA,FERNANDO A. DE; RORATO,VANESSA C.; ALMEIDA-APOLONIO,ADRIANA A.; RODRIGUES,ALLAN B.; BARROS,ALINE L. DE; SANGALLI,ANDRÉIA; ARENA,ARIELLE C.; MOTA,JONAS S.; GRISOLIA,ALEXÉIA B.; OLIVEIRA,KELLY M.P. DE.
ABSTRACT Myracrodruon urundeuva is a plant native to Brazil, which is used by the indigenous population for the treatment of candidiasis. The aims of this study were to evaluate the antifungal activity of extract against human vaginal Candida species and evaluate the possible toxicological activities of M. urundeuva. Initially, ethanol extracts, ethyl acetate fractions, and hydroalcoholic fractions of the bark and leaf of M. urundeuva were used to determine the minimum inhibitory concentration. The extracts that showed antifungal activity were characterized by liquid chromatography and subjected to toxicity assessment. Toxic, cytotoxic, genotoxic, and mutagenic testing were performed using Allium cepa and Ames assays with the ethanol extracts of the bark...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardiaceae; Candidiasis; Myracrodruon urundeuva; Traditional medicine.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502423

Resonance Raman spectroscopy in one-dimensional carbon materials
Provedor de dados: 42
Autores: Dresselhaus,Mildred S.; Jorio,Ado; Pimenta,Marcos A.
Brazil has played an important role in the development and use of resonance Raman spectroscopy as a powerful characterization tool for materials science. Here we present a short history of Raman scattering research in Brazil, highlighting the important contributions to the field coming from Brazilian researchers in the past. Next we discuss recent and important contributions where Brazil has become a worldwide leader, that is on the physics of quasi-one dimensional carbon nanotubes. We conclude this article by presenting results from a very recent resonance Raman study of exciting new materials, that are strictly one-dimensional carbon chains formed by the heat treatment of very pure double-wall carbon nanotube samples.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resonance Raman spectroscopy; Carbon nanotubes; One-dimensional materials; Carbon chains.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300004

Composition and ecology of a snake assemblage in an upland forest from Central Amazonia
Provedor de dados: 42
Autores: MASSELI,GABRIEL S.; BRUCE,ALLAN D.; SANTOS,JUCIMARA G. DOS; VINCEN,TIMOTHY.; KAEFER,IGOR L.
Abstract: Most species of Amazonian snakes have wide geographic distributions. However, local environmental factors influence the formation of assemblages in different localities. In this study, we investigated the composition of the assemblage and the effect of environmental variables on the distribution of the species inhabiting an upland forest in the Experimental Farm area of the Federal University of Amazonas in Manaus, Brazil. Data collection was carried out in 24 standardized plots. Each plot was sampled four times between July 2015 and April 2017 by active search method. We recorded 83 individuals from 29 species belonging to six families. The richness in the study area corresponded to 78% of the snake species and 100% of the families previously...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community ecology; Manaus; RAPELD; Serpentes; Squamata.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200603

Latin American scientific contribution to ecology
Provedor de dados: 42
Autores: WOJCIECHOWSKI,JULIANA; CESCHIN,FERNANDA; PERETO,SUELEN C.A.S.; RIBAS,LUIZ G.S.; BEZERRA,LUIS A.V.; DITTRICH,JAQUELINE; SIQUEIRA,TADEU; PADIAL,ANDRÉ A.
ABSTRACT Latin America embodies countries of special interest for ecological studies, given that areas with great value for biodiversity are located within their territories. This highlights the importance of an evaluation of ecological research in the Latin America region. We assessed the scientific participation of Latin American researchers in ecological journals, patterns of international collaboration, and defined the main characteristics of the articles. Although Latin American publications have increased in fourteen years, they accounted up to 9% of publications in Ecology. Brazil leaded the scientific production in Latin America, followed by Argentina and Mexico. In general, Latin American articles represented a low percentage of most journals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Article citations; International collaboration; Journal impact factor; Neotropics; Research policies; Scientometrics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602663

Seasonality of reproduction of epiphytic bryophytes in flooded forests from the Caxiuanã National Forest, Eastern Amazon
Provedor de dados: 42
Autores: CERQUEIRA,GABRIELA R.; ILKIU-BORGES,ANNA LUIZA; FERREIRA,LEANDRO V.
This work aimed to recognize the reproductive biology of the epiphytic bryoflora of phorophytes of Virola surinamensis (Rol. ex. Rottb.) Warb. in várzea and igapó forests in the Caxiuanã National Forest, to answer the following question: The reproductive period of the bryophyte species is influenced by the environment due the climatic seasonality present in flooded forests, being higher the occurrence of the sexual and asexual reproduction in the rainiest months? The bryophytes were identified and analyzed for the type of reproduction, sexual system and reproductive structures. In total, 502 samples of bryophytes were analyzed, resulting in 54 species, of which 34 were fertile. The comparison of the fertility of the species in different environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Bryoflora; Fertility; Igapó forest; Várzea forest.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300903

Shallow gas accumulation in sediments of the Patos Lagoon, southern Brazil
Provedor de dados: 42
Autores: Weschenfelder,Jair; Corrêa,Iran C.S.; Aliotta,Salvador; Pereira,Carla M.; Vasconcelos,Vinicius E.B. de.
A high resolution seismic survey was conducted in the Patos Lagoon, southern Brazil, aboard of the research vessel LARUS of the Fundação Universidade Federal do Rio Grande (FURG). Around 400 km of 3.5 kHz seismic profiles were collected, which provided acoustic signals of good penetration depth and resolution. Seismic anomalies, including turbidity and pocket gas, revealed that gas-charged sediments are common in several areas of the lagoon. The gas accumulations in the Patos Lagoon are controlled by the spatial distribution of the sedimentary facies. Either in 'curtains' or in 'acoustic turbid zones', the main gas accumulations occur in areas with paleotopographic lows related to fluvial channels and valleys developed in the Rio Grande do Sul coastal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shallow gas; 3.5 kHz seismic; Coastal plain; Rio Grande do Sul.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300017

Genetic differentiation between Plectranthus grandis cramer and Plectranthus barbatus andr. (Lamiaceae)
Provedor de dados: 42
Autores: Passinho,Helna Célia R.; Margis,Rogério; Félix,Durvalina; Maia,Carla S.; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200019

Contrasting life-histories in two syntopic amphibians of the Leptodactylus fuscus group (Heyer 1978)
Provedor de dados: 42
Autores: MARANGONI,FEDERICO; COURTIS,AZUL; PIÑEIRO,JOSE M.; INGARAMO,MARÍA DEL ROSARIO; CAJADE,RODRIGO; STĂNESCU,FLORINA.
Abstract Abstract: We used skeletochronology to compare age, size, reproductive parameters and growth patterns of two related, anuran amphibians from Northern Argentina: Leptodactylus bufonius(n=69) andL. latinasus(n=56), in order to better understand their coexistence in syntopy. Previous studies showed that the two species overlap in their dietary requirements and utilize the same habitats for feeding and breeding. We found that their life-history patterns are significantly different,L. bufoniusbeing larger, and having a higher reproductive output and lifespan, compared to the smaller and shorter-livingL. latinasus. Since none of the species exhibited sexual size dimorphism, and both acquired sexual maturity after the first year of life, we suggest that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age; Anura; Body size; Growth; Leptodactylus bufonius; Leptodactylus latinansus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500605

Sunflower protein concentrate and crambe protein concentrate in diets for silver catfish Rhamdia quelen (Quoy and Gaimard, 1824): use as sustainable ingredients
Provedor de dados: 42
Autores: LOVATTO,NAGLEZI M.; LOUREIRO,BRUNO B.; PIANESSO,DIRLEISE; ADORIAN,TAIDA J.; GOULART,FERNANDA R.; SPERONI,CAROLINE S.; BENDER,ANA BETINE B.; MÜLLER,JUCIELI; SILVA,LEILA P. DA.
Abstract The objective of this study was to evaluate growth and metabolic parameters of silver catfish fed with protein concentrates of sunflower meal (SMPC) and crambe meal (CrMPC). The study evaluated two levels of substitution, where 25 or 50% of animal protein was replaced with plant-based protein. A total of 300 silver catfish (14 ± 0.26 g) were used in five treatments and three replications, in fifteen 280-liter experimental units. The results were submitted to analysis of variance and the means of the control diet was compared to the remaining treatments by Dunnett’s test at 5% significance level. At the end of the trial, no differences were observed for the variables final weight and daily weight gain. However, minor feed conversion was observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crambe abyssinica; Fish feeding; Helianthus annus; Jundiá; Liver metabolism; Plant-based protein concentrates.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703781

Energy trends and the water-energy binomium for Brazil
Provedor de dados: 42
Autores: Rocha,Gisele O. Da; Anjos,Jeancarlo P. Dos; Andrade,Jailson B. De.
According to the demands of energy saving and carbon emission reduction, the water vs. energy nexus has become a major concern worldwide. Brazil occupies a singular position in the global energy system. A major portion of the Brazilian occupancies has electricity and the energy system expansion that, at first, possesses adequate means for supporting the economic growing may experience some turnovers. The Brazil determination through alternative fuels was a natural choice, given its large hydropower potential and land agricultural base. In the transportation sector Brazil has developed its energy matrix towards an important rate of ethanol and biodiesel. Although those fuels are low carbon emitter, they may probably not be an affordable alternative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Fossil fuel; Water-energy nexus; Brazilian energy matrix.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200569

The Nadarajah-Haghighi Lindley distribution
Provedor de dados: 42
Autores: PEÑA-RAMÍREZ,FERNANDO A.; GUERRA,RENATA R.; CORDEIRO,GAUSS M.
Abstract: We define a new lifetime model based on compounding the Lindley and Nadarajah-Haghighi distributions. The proposed distribution is very competitive to other lifetime models. Some of its mathematical properties are investigated including generating function, mean residual life, moments, Bonferroni and Lorenz curves and mean deviations. We discuss the estimation of the model parameters by maximum likelihood. We provide a simulation study and two applications to real data for illustrative purposes. We prove empirically that the new distribution yields good fits to both data sets, and it can be a useful alternative for other classical lifetime models.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compounding approach; Exponential distribution; Lifetime data; Lindley distribution; Nadarajah-Haghighi distribution.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100201

Stoichiometry-based estimates of ferric iron in calcic, sodic-calcic and sodic amphiboles: a comparison of various methods
Provedor de dados: 42
Autores: Gualda,Guilherme A.R.; Vlach,Silvio R.F.
An important drawback of the electron microprobe is its inability to quantify Fe3+/Fe2+ ratios in routine work. Although these ratios can be calculated, there is no unique criterion that can be applied to all amphiboles. Using a large data set of calcic, sodic-calcic, and sodic amphibole analysis from A-type granites and syenites from southern Brazil, weassess the choices made by the method of Schumacher (1997, Canadian Mineralogist, 35: 238-246), which uses the average between selected maximum and minimum estimates. Maximum estimates selected most frequently are: 13 cations excluding Ca, Na, and K (13eCNK - 66%); sum of Si and Al equal to 8 (8SiAl - 17%); 15 cations excluding K (15eK - 8%). These selections are appropriate based on crystallochemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphiboles; Stoichiometry; Ferric iron; EPMA.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300012

Anisotropy of magnetic susceptibility applied to diamictites of the Rio do Sul formation, Paraná basin: initial results
Provedor de dados: 42
Autores: Archanjo,Carlos J.; Castro,Joel C.; Castro,Marília R.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400015

Simplified three-dimensional model provides anatomical insights in lizards' caudal autotomy as printed illustration
Provedor de dados: 42
Autores: AMORIM,JOANA D.C.G. DE; TRAVNIK,ISADORA; SOUSA,BERNADETE M. DE.
Lizards' caudal autotomy is a complex and vastly employed antipredator mechanism, with thorough anatomic adaptations involved. Due to its diminished size and intricate structures, vertebral anatomy is hard to be clearly conveyed to students and researchers of other areas. Three-dimensional models are prodigious tools in unveiling anatomical nuances. Some of the techniques used to create them can produce irregular and complicated forms, which despite being very accurate, lack didactical uniformity and simplicity. Since both are considered fundamental characteristics for comprehension, a simplified model could be the key to improve learning. The model here presented depicts the caudal osteology of Tropidurus itambere, and was designed to be concise, in order...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; 3D modeling; Teaching; Learning; Tropidurus itambere.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100063

Drying and reduction in sensitivity to desiccation of seeds of Alibertia edulis: the influence of fruit ripening stage
Provedor de dados: 42
Autores: CREMON,THAIS; DRESCH,DAIANE M.; SCALON,SILVANA P.Q.; MASETTO,TATHIANA E.
ABSTRACT The intense environmental degradation in tropical regions suitable for agriculture has decreased native forest populations of plants with important fruits and medicinal properties. Alibertia edulis is a native tree from the Brazilian Cerrado. Knowledge about the effects of drying and storage on the physiological behavior of its seeds may aid in its sustainable exploitation and conservation. The goal of the present study was to determine which fruit ripening stage results in A. edulis seeds with higher tolerance to desiccation, and to investigate the effectiveness of polyethylene glycol (PEG) induced osmotic stress in combination with abscisic acid (ABA) in increasing seed desiccation tolerance during storage. Seeds were dried in activated silica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fast drying; Slow drying; Polyethylene glycol; Abscisic acid; Storage.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401481

Palynological analysis of a late Holocene core from Santo Antônio da Patrulha, Rio Grande do Sul, Southern Brazil
Provedor de dados: 42
Autores: Macedo,Renato B.; Souza,Paulo A.; Bauermann,Soraia G.; Bordignon,Sérgio A.L.
A sedimentar core collected at Santo Antônio da Patrulha, Rio Grande do Sul State, southmost Brazil, was submitted to pollen analysis to provide the vegetational history of this region, and the paleoecological and paleoclimatic changes. A total of 98 taxa of palynomorphs was identified from 35 subsamples. Three radiocarbonic datings were obtained along a section of 115 cm depth, including the basal age of 4730 ± 50 yr BP. Pollen diagrams and cluster analysis were performed based on palynomorphs frequencies, demonstrating five distinct phases (SAP-I to SAP-V), which reflected different paleoecological conditions. The predominance of plants associated with grasslands in the phase SAP-I suggests warm and dry climate conditions. A gradual increasing of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleoecology; Paleoclimatology; Atlantic rainforest; Late Holocene; Rio Grande do Sul State.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300020

The holoplankton of the Santa Catarina coast, southern Brazil
Provedor de dados: 42
Autores: Resgalla Jr,Charrid.
This paper presents information from different sampling surveys carried out along the Santa Catarina coast in order to outline the biogeographical characteristics of the zooplankton in this region and identify species or groups of species with potential use as bioindicators. Based on a checklist of species of the zooplankton community in the state, it was observed that, in the warmer months of the year, the fauna is similar to that of the states of Paraná and São Paulo (e.g. Creseis virgula f. virgula, Penilia avirostris; Acartia lilljeborgi and Oithona oswaldocruzi), while in the colder months there are coastal representatives of the fauna of Rio Grande do Sul (e.g. Acartia tonsa). However, the zooplankton consists predominantly of warm water species for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindicators; Checklist; Coastal species; Water mass; Coastal environments; Biogeography.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200017

Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data
Provedor de dados: 42
Autores: SOUZA,LENA S.B.; ROSSETTI,DILCE F.; ELIAS,VAGNER R.; PRADO,RENATO L.
Studies suggest that the Marajó Island has experienced neotectonic activity during its latest evolution. However, there are no data demonstrating the presence of tectonic structures in its shallow subsurface. This work integrates vertical electric sounding, morphostructural lineaments, and geological data aiming to show fault control on the Late Pleistocene-Holocene sedimentation of this area. Resistivity values were related to mud (&lt; 90 Ωm), clayey sand (90 and 200 Ωm), sand (200 and 500 Ωm), as well as Fe-bearing sand and laterite (&gt; 500 Ωm). The latest values were related to the unconformity with lateritic paleosol at the top of the Barreiras Formation. Despite the values ≤ 500 Ωm of both the Barreiras Formation and the Late Pleistocene-Holocene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vertical electric sounding; Faults; Quaternary; Marajó Island; Remote sensing.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100073

Ash content, carbon and C/N ratio in paricá in function of NPK fertilization
Provedor de dados: 42
Autores: VIEIRA,CRISTIANE R.; WEBER,OSCARLINA L.S.; SCARAMUZZA,JOSÉ FERNANDO.
ABSTRACT Fertilization in areas of forest plantations is needed to supplement plants´ nutritional needs until harvest. An experiment was performed to check the influence of fertilization on levels of ash, carbon and C/N relation in Schizolobium amazonicum. Soil liming was performed and fertilization occurred after 15 days of incubation. S. amazonicum seedlings were produced and submitted to fertilization with N, P and K: N = 0, 40, 80 and 120 kg ha-1; P2O5 = 0, 50, 100 and 200 kg ha-1; K2O = 0, 50, 100 and 200 kg ha-1. The plants were measured after 180 days. The seedlings of 20 treatments with the highest increase in height and diameter were transplanted to the field. Soil was fertilized and limestone was spread; seedlings were distributed into randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest nutrition; Inorganic compounds; Schizolobium amazonicum; Vegetal charcoal.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100333

Environmental fragility and vegetation cover dynamics in the Lapa Grande State Park, MG, Brazil
Provedor de dados: 42
Autores: CAMPOS,JASMINE A.; AIRES,UILSON R.V.; SILVA,DEMETRIUS D. DA; CALIJURI,MARIA LÚCIA.
Abstract: The environmental fragility analysis evaluates the susceptibility of an environment to degradation. Thus, the goals of this work are to analyze and map the environmental fragility of the Lapa Grande State Park (PELG), Brazil, and its buffer zone (ZA) and also quantify the changes in the vegetation cover before and after the implementation of the PELG. The environmental fragility was evaluated through multicriteria analysis using the factors: slope, geology, pedology and land use and land cover. The changes in the high vigor vegetation cover were determined from the normalized difference vegetation index (NDVI) for 1996, 2006 and 2016. It was verified that the central-east and northeast regions of the PELG presented the greatest environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental fragility; Environmental management; Lapa Grande park; Multicriteria analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300503

Grape juice increases the BDNF levels but not alter the S100B levels in hippocampus and frontal cortex from male Wistar Rats
Provedor de dados: 42
Autores: DANI,CAROLINE; ANDREAZZA,ANA CRISTINA; GONÇALVES,CARLOS ALBERTO; KAPIZINSKI,FLÁVIO; HENRIQUES,JOÃO A. P.; SALVADOR,MIRIAN.
ABSTRACT Several studies have shown that a high consumption of vegetables and fruits is consistently associated with a low risk of oxidative stress-induced diseases, which includes some degenerative diseases such as amyotrophic lateral sclerosis, Alzheimer and Parkinson. Therefore, the objective of this study is to verify the effects of conventional and organic grape juice in the modulation of the neurotrophic factor (BDNF) and astrocytic markers protein (S100B) in hippocampus and frontal cortex of Wistar rats. In this study, 24 male Wistar rats were divided into three groups. To the first one, it was given organic purple grape juice; to the second, conventional grape juice, while the last one received only saline. After 30 days, all rats were sacrificed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brain; Grape juice; Neuroprotection; Polyphenol.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100155

Structures related to resprouting potential of two Myrtaceae species from Cerrado: morpho-anatomical and chemical studies
Provedor de dados: 42
Autores: SILVA,GABRIELA S. DA; FERRARO,ALEXANDRE; OGANDO,FELIPE I.B.; AGUIAR,CLAUDIO L. DE; APPEZZATO-DA-GLÓRIA,BEATRIZ.
Abstract  Resprouting is a functional trait in species which occur in fire-prone ecosystems. These plants can resprout from aerial buds and by recruiting belowground bud bank using carbohydrates allocated in roots as resource. In this study, we present morpho-anatomical features and chemical composition related to the resprouting potential of two species of Eugenia L. in an area of the Cerrado (Brazilian savanna) under regeneration, after the clear-cutting of Pinus sp. with the later burning of pine needles layer. We used standard histological techniques for belowground organs analysis and aerial buds protection degree. Belowground buds in layer from soil surface down to 10 depth were counted and the chemical analyses were performed on roots. In all aerial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accessory buds; Bud bank; Brazilian savanna; Colleters; Eugenia dysenterica; Eugenia punicifolia.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100702

How a simple and stereotyped acoustic signal transmits individual information: the song of the White-browed Warbler Basileuterus leucoblepharus
Provedor de dados: 42
Autores: Aubin,Thierry; Mathevon,Nicolas; Silva,Maria Luisa da; Vielliard,Jacques M.E.; Sebe,Frederic.
The White-browed Warbler Basileuterus leucoblepharus, a common bird of the BrazilianAtlantic forest, emits only one distinct song type in the context of territorial defense. Individual or neighbor-stranger recognition may be more difficult when birds share similar songs. In fact, the analysis of songs of different individuals reveals slight differences in the temporal and the frequency domains. Effectively, a careful examination of the signals of different individuals (21) by 5 complementary methods of analysis reveals first, that one or two gaps in frequency occur between two successive notes at different moments of the song, and second, that their temporal and frequency positions are stereotyped for each individual. Playback experiments confirm these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bird acoustic communication; Individual information; Tropical forest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200022

Geochemical studies of the amazonian basin using transition elements and ree
Provedor de dados: 42
Autores: Boaventura,Geraldo R.; Seyler,Partrick.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400032

Orange and Passion Fruit Wastes Characterization, Substrate Hydrolysis and Cell Growth of Cupriavidus necator, as Proposal to Converting of Residues in High Value Added Product
Provedor de dados: 42
Autores: LOCATELLI,GABRIEL O.; FINKLER,LEANDRO; FINKLER,CHRISTINE L.L.
Abstract: Brazil is the world’s largest producer of orange and passion fruit, which are destined mainly for industrialization, generating grand volumes of wastes. The solid portion of these residues is a rich source of pectin - composed mainly of galacturonic acid and neutral sugars, which through the hydrolysis process can be used in biological conversion processes, as the production of polyhydroxyalkanoates (PHAs). This way, we characterized these wastes, followed by the extraction and hydrolysis of pectin for employ as a substrate for the cell growth of Cupriavidus necator. The results confirmed the large portion of pectin (almost 40 g.100g-1) and soluble sugars, present in these wastes. The hydrolyzed extract showed as a good source of carbon for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological conversion processes; Enzymatic hydrolyses; Orange wastes; Passion fruit wastes; Pectin; Polyhydroxyalkanoates.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100629

Comparative pollen morphological analysis in the subgenera Passiflora and Decaloba
Provedor de dados: 42
Autores: SOARES,TALIANE L.; JESUS,ONILDO N.; SOUZA,EVERTON H.; ROSSI,MÔNICA L.; OLIVEIRA,EDER J.
ABSTRACT The genus Passiflora is the most diversified of the Passifloraceae, and its palynology presents wide morphological variability. The objective of the study was to evaluate the pollen morphology of 18 Passiflora species in order to identify informative pollinic characteristics to contribute to the taxonomic classification of the genus. The morphology of the pollen grains and the exine structure were investigated using light microscopy and scanning electron microscopy. Differences in the pollen morphology were found in the studied species, mainly in terms of shape, pollen aperture and ornamentation pattern of the exine. Most of the species belonging to the subgenus Passiflora presented ornamented 6-syncolpate pollen grains with an oblate-spheroidal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passifloraceae; Pollen grains; Scanning electron microscopy; Exine; Morphological characterization.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502381

Effect of the essential oil from Piper solmsianum C.DC. leaves in mice Behaviour
Provedor de dados: 42
Autores: Moreira,Davyson de L.; Santos,Patrícia O. dos; Pereira,Nuno A.; Cardoso,Geraldo L.; Guimarães,Elsie F.; Kaplan,Maria Auxiliadora C.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200018

Contamination in mafic mineral-rich calc-alkaline granites: a geochemical and Sr-Nd isotope study of the Neoproterozoic Piedade Granite, SE Brazil
Provedor de dados: 42
Autores: Leite,Renato J.; Janasi,Valdecir A.; Martins,Lucelene.
The Piedade Granite (~600 Ma) was emplaced shortly after the main phase of granite magmatism in the Agudos Grandes batholith, Apiaí-Guaxupé Terrane, SE Brazil. Its main units are: mafic mineral-rich porphyritic granites forming the border (peraluminous muscovite-biotite granodiorite-monzogranite MBmg unit) and core (metaluminous titanite-bearing biotite monzogranite BmgT unit) and felsic pink inequigranular granite (Bmg unit) between them. Bmg has high LaN/YbN (up to 100), Th/U (&gt;10) and low Rb, Nb and Ta, and can be a crustal melt derived from deep-seated sources with residual garnet and biotite. The core BmgT unit derived from oxidized magmas with high Mg# (~45), Ba and Sr, fractionated REE patterns (LaN/YbN= 45), 87Sr/86Sr(t)~ 0.710, epsilonNd(t) ~...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Granite; Calc-alkaline; Peraluminous; Magma contamination; Sr-Nd isotope geochemistry.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200013

The inversion of the São José do Itaboraí paleocene basin (RJ) in a strike-slip regime
Provedor de dados: 42
Autores: Ferrari,André L.; Riccomini,Claudio.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400019

Assessment of cow and farm level risk factors associated with Ureaplasma diversum in pasture-based dairy systems - A field study
Provedor de dados: 42
Autores: NASCIMENTO-ROCHA,JOSEFA M.; OLIVEIRA FILHO,BENEDITO D. DE; ARNHOLD,EMANNUEL; PÔRTO,REGIANI N.G.; LIMA,SVETLANA F.; GAMBARINI,MARIA LUCIA.
ABSTRACT Potential risk factors for Ureaplasma diversum in the vaginal mucus of 1,238 dairy cows were included in a multivariate logistic regression model, based on the cow level (i.e., granular vulvovaginitis [+GVV], yearly milk production [4500 kg or more], pregnancy, predominance of Bos taurus [+Bos Taurus], score of corporal condition [at least 2.5], concomitant positivity for Escherichia coli [+E.coli]), and farm level i.e., milking room hygiene (-Milking room), dunghill location, and replacement female). Ureaplasma diversum was present in 41.1% of the samples. Independent risk factors for U. diversum were +GVV (odds ratio [OR], 1.31); +Mycoplasma spp (OR, 5.67); yearly milk production (4500 kg or more) (OR, 1.99); +Bos taurus (OR, 1.68); +E. coli...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cow; Exposure factors; Genital ureaplasmosis; Mollicutes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401779

Spatial-temporal variability of rainfall and mean air temperature for the state of Bahia, Brazil
Provedor de dados: 42
Autores: MEDAUAR,CAIQUE C.; SILVA,SAMUEL A.; CARVALHO,LUIS CARLOS C.; GALVÃO,ÍCARO M.; MACÊDO,PHILYPE V.
Abstract  The aim of this study was to evaluate spatial behavior and temporal stability of rainfall and mean air temperature in the state of Bahia, using historical series from 1975 to 2011 and 1961 to 2009, respectively. The analyses were performed considering the accumulated variables of each month of the historical series. The accumulated monthly totals were divided by the number of years of observation, obtaining the monthly average values ​​of rainfall and air temperature for each measurement point. The data were submitted to descriptive statistical analysis and linear correlation studies. Geostatistical analysis was used to verify the existence and quantify spatial dependence between the values of the studied variables. In addition, the maps were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatic variables; Geostatistics; Meteorology; Thematic maps.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100605

Morpho-physiological changes in Billbergia zebrina due to the use of silicates in vitro
Provedor de dados: 42
Autores: MARTINS,ADALVAN D.; MARTINS,JOÃO PAULO R.; BATISTA,LUCAS A.; DIAS,GABRIELEN M.G.; ALMEIDA,MIRIELLE O.; PASQUAL,MOACIR; SANTOS,HELOÍSA O. DOS.
Abstract The use of silicon in Billbergia zebrina cultivation in vitro is an alternative for optimizing micropropagation of this important ornamental plant species. The objective of the present study was to evaluate the growth and anatomical and physiological alterations in Billbergia zebrina (Herbert) Lindley plants as a function of different sources and concentrations of silicon during in vitro cultivation and acclimatization. The experimental design was completely randomized, with a double factorial arrangement and an additional control treatment (2 x 3 + 1). The first factor was relative to calcium silicate and sodium silicate added to the Murashige &amp; Skoog culture medium; the second factor was related to its concentrations, 0.5, 1.0, and 2.0 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliad; Micropropagation; Plant anatomy; Plant physiology; Silicon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703449

Comparative cytogenetic analysis in Erythrolamprus snakes (Serpentes: Dipsadidae) from Argentina
Provedor de dados: 42
Autores: FALCIONE,CAMILA; HERNANDO,ALEJANDRA; BRESSA,MARÍA JOSÉ.
ABSTRACT We described the karyotypes of five snake taxa from Argentina: Erythrolamprus almadensis, E. ceii, E. poecilogyrus caesius, E. p. schotti and E. p. sublineatus, and also intergrading individuals between the last two subspecies by conventional staining, chromosome bandings and fluorescent in situ hybridization (FISH) with 28S ribosomal DNA probes. Erythrolamprus ceii and E. almadensis share a diploid chromosome number of 2n= 28, whereas in E. poecilogyrus intraspecific variations were observed: E. p. caesius has 2n= 28, E. p. schotti and E. p. sublineatus as well as in the intergrading individuals have 2n= 32. In E. almadensis and E. p. caesius, the 2nd and 6th chromosome pairs respectively are heteromorphic by size, morphology and C-banding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ag-NOR; C-banding; Xenodontini; Fluorescent banding; RDNA-FISH; Sex chromosomes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401417

In vitro antioxidant, DNA-damaged protection and antiproliferative activities of ethyl acetate and n-butanol extracts of Centaurea sphaerocephalaL.
Provedor de dados: 42
Autores: LAHNECHE,AMINA M.; BOUCHEHAM,RATIBA; OZEN,TEVFIK; ALTUN,MUHAMMED; BOUBEKRI,NASSIMA; DEMIRTAS,IBRAHIM; BICHA,SABRINA; BENTAMENE,ALI; BENAYACHE,FADILA; BENAYACHE,SAMIR; ZAMA,DJAMILA.
Abstract: This study aimed to evaluate the in vitro antiproliferative and inhibition of oxidative DNA-damage activities of n-butanol (n-BuOH) extract of Centaurea sphaerocephala. The in vitro antioxidant activity of the ethyl acetate (EtOAc) and the n-BuOH extracts of this plant were also assayed. To investigate the antioxidant potential, extracts were tested for their capacity to scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH·) and to inhibit lipid peroxidation using the TBARs method. The contents of total phenolics and flavonoids were measured. Additionally, antiproliferative activity and DNA-damage inhibition of the n-BuOH extract was determined using XCELLigence RTCA instrument and photolyzing 46966 plasmid, respectively. The results exhibited that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centaurea sphaerocephala; Phenolics; Antioxidant; Lipid peroxidation; Antiproliferative; DNA-damaged inhibition.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500619

The Cystic Fibrosis Transmembrane Regulator (CFTR) in the kidney
Provedor de dados: 42
Autores: MORALES,MARCELO M.; FALKENSTEIN,DORIS; LOPES,ANÍBAL GIL.
The cystic fibrosis transmembrane regulator (CFTR) is a Cl- channel. Mutations of this transporter lead to a defect of chloride secretion by epithelial cells causing the Cystic Fibrosis disease (CF). In spite of the high expression of CFTR in the kidney, patients with CF do not show major renal dysfunction, but it is known that both the urinary excretion of drugs and the renal capacity to concentrate and dilute urine is deficient. CFTR mRNA is expressed in all nephron segments and its protein is involved with chloride secretion in the distal tubule, and the principal cells of the cortical (CCD) and medullary (IMCD) collecting ducts. Several studies have demonstrated that CFTR does not only transport Cl- but also secretes ATP and, thus, controls other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CFTR; Kidney; Nephron; Chloride channel.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300013

Anti-inflammatory effect of the ethanolic extract from Bowdichia virgilioides H.B.K stem bark
Provedor de dados: 42
Autores: Barros,Wander M.; Rao,Vietla S.N.; Silva,Regilane M.; Lima,Joaquim C.S.; Martins,Domingos T.O.
Bowdichia virgilioides H.B.K stem bark (Fabaceae), locally known as "sucupira-preta", is a reputed folk-remedy to treat some inflammatory disorders. To validate its traditional claim, the ethanolic extract from B. virgilioides was evaluated in several animal models of inflammation and nociception. The extract at oral doses of 100 to 1000 mg/kg body weight caused a significant inhibition of carrageenan-induced hind paw oedema, suppression of exudate volume and leukocyte immigration in rat pleurisy induced by carrageenan, and reduction of granuloma weights in the model of subcutaneous granulomas promoted by cotton pellets. In addition, the plant extract significantly inhibited the vascular permeability increase induced by intraperitoneal acetic acid. It also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bowdichia virgilioides; Fabaceae; Stem bark extract; Anti-inflammatory activity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300008

Lifespan and population dynamics of the endemic South American shrimpArtemesia longinaris (Crustacea: Penaeidae) in southeastern Brazil
Provedor de dados: 42
Autores: CASTILHO,ANTONIO L.; GRABOWSKI,RAPHAEL C.; SIMÕES,SABRINA M.; SANTOS,ANA PAULA F.; COSTA,ROGÉRIO C.; FRANSOZO,ADILSON.
ABSTRACT The present study investigated the growth, longevity and reproductive dynamics ofArtemesia longinaris in the southeastern coast of Brazil over a two-year period. Monthly collections were conducted in Ubatuba and Caraguatatuba using a shrimp fishing boat equipped with "double-rig" nets. Each region was divided into 7 sampling stations up to 35 m deep. Size frequency distributions, growth, longevity, sex ratio, and abundance of individuals in each demographic class, were compared. The relationship between abiotic factors and abundance of each demographic class was assessed using a Canonical Correlation Analysis. A total of 64,641 individuals were collected (6,928 measured) with an estimated longevity of 1.30 (Ubatuba) and 1.14 (Caraguatatuba) years...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Habitat selection; Latitudinal variation; Longevity; Penaeoidea; Reproductive dynamics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502123

On groups of formal diffeomorphisms of several complex variables
Provedor de dados: 42
Autores: Martelo,Mitchael; Scárdua,Bruno.
In this note we announce some results in the study of groups of formal or germs of analytic diffeomorphisms in several complex variables. Such groups are related to the study of the transverse structure and dynamics of Holomorphic foliations, via the holonomy group notion of a foliation's leaf. For dimension one, there is a well-established dictionary relating analytic/formal classification of the group, with its algebraic properties (finiteness, commutativity, solvability, among others). Such system of equivalences also characterizes the existence of suitable integrating factors, i.e., invariant vector fields and one-forms associated to the group. Our aim is to state the basic lines of such dictionary for the case of several complex variables groups. Our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Formal complex diffeomorphism; Infinitesimal generator; Holomorphic foliation; Germ of complex diffeomorphism.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400002

Pear quality characteristics by Vis / NIR spectroscopy
Provedor de dados: 42
Autores: Machado,Nicácia P.; Fachinello,José C.; Galarça,Simone P.; Betemps,Débora L.; Pasa,Mateus S.; Schmitz,Juliano D.
Recently, non-destructive techniques such as the Vis / NIR spectroscopy have been used to evaluate the characteristics of maturation and quality of pears. The study aims to validate the readings by the Vis / NIR spectroscopy as a non-destructive way to assess the qualitative characteristics of pear cultivars 'Williams', 'Packams' and 'Carrick', produced according to Brazilian conditions. The experiment was conducted at the Pelotas Federal University, UFPel, in Pelotas / RS, and the instrument used to measure the fruit quality in a non-destructive way was the NIR- Case spectrophotometer (SACMI, Imola, Italy). To determine pears' soluble solids (SS) and pulp firmness (PF), it was established calibration equations for each variety studied, done from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calibration; Firmness; Pear; Soluble solids; Validation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300027

Medicinal plants used by "Passo da Ilha" rural community in the city of Pato Branco, southern Brazil
Provedor de dados: 42
Autores: Marchese,José A.; Ming,Lin C.; Franceschi,Lucia de; Camochena,Rubia C.; Gomes,Greice D.R.; Paladini,Marcos V.; Capelin,Diogo; Marchese,Cristine F.
The scope of this work was to rescue and document the traditional knowledge regarding the medicinal plants used by Passo da Ilha rural community, in Pato Branco, Paraná State, Southern Brazil (26° 11' S, 52°36' W and 760 m high). Structured interviews were made in field research with 16 informants who had the traditional knowledge about medicinal plants. The research was carried out from October to December 2000. The plants were collected in the field, identified and their vouchers were housed at the Herbarium "Irina Delanova De Gemtchjnicov" (BOTU) of São Paulo State University, in Botucatu. A total of 47 botanical families and 114 species of medicinal plants were identified. These plants ere suitable for ore than 30 different edicinal uses. The residents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultural erosion; Ethnobotany; Medicinal plants; Traditional knowledge.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400008

Growth of the Anchovy Anchoa tricolor in a brazilian subtropical estuary
Provedor de dados: 42
Autores: CARVALHO,BARBARA M. DE; FONTOURA,NELSON F.; SPACH,HENRY L.
ABSTRACT This study aimed to describe the growth parameters of Anchoa tricolor in a subtropical estuary. From August 2010 to July 2011, 10.009 specimens of the anchovy Anchoa tricolor, mean total length 4.2 cm (±1.45), were captured in the intertidal region of the Estuarine Complex of Paranaguá (25º 15’ - 25° 35’ S and 48° 20’ - 48° 45’ W). Species´s weight/length relationship for grouped genders was described as follow:   W = 0.0000591.Lt3.282 (length in centimeters; weight in grams) showing a positive allometric growth pattern (b&gt;3; P=0.000). Significant differences concerning weight/length relationship for males, females and unsexed individuals were identified. Parameters of the length to age growth curve were estimated by adjusting a von Bertalanffy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bertalanffy; Engraulidae; Longevity; Weight/length relationship.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502097

Effects of insulin and actin on phosphofructokinase activity and cellular distribution in skeletal muscle
Provedor de dados: 42
Autores: Silva,Ana Paula P.; Alves,Gutemberg G.; Araújo,Alexandre H.B.; Sola-Penna,Mauro.
In this work, we report evidences that the association of phosphofructokinase and F-actin can be affected by insulin stimulation in rabbit skeletal muscle homogenates and that this association can be a mechanism of phos-phofructokinase regulation. Through co-sedimentation techniques, we observed that on insulin-stimulated tissues, approximately 70% of phosphofructokinase activity is co-located in an actin-enriched fraction, against 28% in control. This phenomenon is accompanied by a 100% increase in specific phosphofructokinase activity in stimulated homogenates. Purified F-actin causes an increase of 230% in phosphofructokinase activity and alters its kinetic parameters. The presence of F-actin increases the affinity of phosphofructokinase for fructose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphofructokinase; Hormone; Rabbit; Actin; Metabolism; Glycolysis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300008

A new ascarid species in cynodont coprolite dated of 240 million years
Provedor de dados: 42
Autores: SILVA,PRISCILLA A. DA; BORBA,VICTOR H.; DUTRA,JULIANA M.F.; LELES,DANIELA; DA-ROSA,ATILA A.S.; FERREIRA,LUIZ F.; ARAUJO,ADAUTO.
Cynodonts represent the transition from reptiles to mammals. They are classified as synapsids, or tetrapod animals with mammalian characteristics. We present here the finding of helminth eggs in a coprolite identified as of cynodont origin dated of nearly 240 million years. Microscopy revealed the presence of very well preserved intestinal parasite eggs. Up to now we identified an ascarid egg by morphological characteristics. Based on a previous description of the new genus Ascarites Poinar Jr and Boucot 2006 in coprolites of iguanodons from Belgium, we propose a new species,Ascarites rufferi n.sp. in cynodonts, a host that inhabited the Southern Region of Brazil in the Triassic period.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascarids; Coprolites; Cynodont; Evolution; Paleoparasitology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100265

Assessment of Anti-inflammatory and Antioxidant Properties of Safranal on CCI4-Induced Oxidative Stress and Inflammation in Rats
Provedor de dados: 42
Autores: ALAYUNT,ÖMER N.; AKSOY,LAÇINE; KARAFAKIOĞLU,YASEMIN S.; SEVIMLI,SEVCAN.
Abstract: The present study aimed to determine the antioxidative and anti-inflammatory effects of safranal on damage induced by CCl4. Experimental animals were divided into five groups. The first group was determined as the control group and no treatment was conducted. Second group rats were administered 1 mL/kg-day CCI4 during the experiment. Rats in Groups 3, 4 and 5 were administered 1 mL/kg-day CCI4 and 25 mg/kg, 50 mg/kg; 100 mg/kg safranal, respectively via gavage. Oxidative-antioxidant parameters, liver function enzymes and inflammatory cytokine levels were determined in liver samples obtained from the rats. Data analysis demonstrated that oxidative stress and inflammation markers were significantly higher in CCI4 administered groups (p&lt;0.05)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; CCI4; Inflammation; Safranal.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300704

The quaternary geological history of the Santa Catarina Southeastern Region (Brazil)
Provedor de dados: 42
Autores: CARUSO JR.,FRANCISCO; SUGUIO,KENITIRO; NAKAMURA,TOSHIO.
This paper supply subsidies for Quaternary geological reconstruction of the southeastern State of Santa Catarina coast in Brazil, being based on detailed geological mapping supported by a series of drilling data, which allowed to establish a stratigraphical hierarchy of the sedimentary deposits. Among the mapped geological units stand out the extensive Pleistocene shallow marine sandy sediments, which are commonly referred as a barrier island - lagoonal depositional system. A drilling campaign done in the domain permitted the sampling of material for 14C datings, and the obtained data confirmed some previously assumed ages. The sequence of events, that originated the Holocene deposits, has been also reconstructed through drilling and 14C dating of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quaternary geology; Depositional system; Calcareous shell deposits; Santa Catarina coastal area.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000200011

Yungahelea, a new genus of predaceous midge from northwestern Argentina (Culicomorpha: Ceratopogonidae)
Provedor de dados: 42
Autores: SPINELLI,GUSTAVO R.; RONDEROS,MARÍA M.; DONATO,MARIANO; SIRI,AUGUSTO.
ABSTRACT A new monotypic genus and species of predaceous midge from the southernmost area of the Argentinean Yungas, Yungahelea australis Spinelli and Ronderos, is described and illustrated from male and female adults. It belongs to a group containing the Ceratopogonini genera Parabezzia Malloch, Diaphanobezzia Ingram and Macfie, Spinellihelea Borkent, Grogan and Picado, Leptohelea Wirth and Blanton, and Fittkauhelea Wirth and Blanton. Phylogenetic interpretation indicates that Yungahelea is the sister group of Spinellihelea or the clade composed by Parabezzia and Diaphanobezzia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diptera; Ceratopogonidae; Yungas; New genus; Phylogeny.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100137

Effects of hormonal priming on seed germination of pigeon pea under cadmium stress
Provedor de dados: 42
Autores: SNEIDERIS,LARISSA C.; GAVASSI,MARINA A.; CAMPOS,MARCELO L.; D'AMICO-DAMIÃO,VICTOR; CARVALHO,ROGÉRIO F.
In this work we investigated whether priming with auxin, cytokinin, gibberellin, abscisic acid and ethylene, alters the physiological responses of seeds of pigeon pea germinated under water and cadmium stress. Seeds treated with water or non-treated seeds were used as control. Although compared to non-treated seeds we found that the hormone treatments improve the germination of pigeon pea under cadmium stress, however, these treatments did not differ from water. However, we also observed a trend of tolerance to the effects of cadmium in the presence of ethylene, suggesting that the use of this hormone may be an efficient method to overcome seed germination under metal stress.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cajanus Cajan; Heavy metal; Hormones; Pretreatment in seeds; Abiotic stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401847

Evaluation of the use of Leptodactylus ocellatus (Anura: Leptodactylidae) frog tissues as bioindicator of metal contamination in Contas River, Northeastern Brazil
Provedor de dados: 42
Autores: CORREIA,LÍVIA O.; SIQUEIRA JÚNIOR,SÉRGIO; CARNEIRO,PAULO L.S.; BEZERRA,MARCOS A.
This paper presents a study on the viability of the use of tissues of the Leptodactylus ocellatus species (Anura Leptodactylidae) as a bioindicator of metal pollution. The study is based on the determination and correlation of the concentrations of manganese, chromium, zinc, nickel, copper and iron in sediments and tissues (skin, muscles and viscera) of the frog Leptodactylus ocellatus collected in the middle region of the Contas River in Bahia, Brazil. The highest levels of the metals studied were found in the viscera of this animal. In this tissue, a higher correlation of the concentration of these metals with those found in sediments was also observed. The concentrations of elements found in the skin and muscles of these amphibians have revealed no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leptodactylus ocellatus; Bioindicators; Sediments; Metals; Contas River.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401549

Phytogenic as feed additive for suckling dairy calves’ has a beneficial effect on animal health and performance
Provedor de dados: 42
Autores: VOLPATO,ANDREIA; CRECENCIO,REGIANE B.; TOMASI,THAINÃ; GALLI,GABRIELA M.; GRISS,LUIZ GUSTAVO; SILVA,ANIÉLEN D. DA; SCHETINGER,MARIA ROSA C.; SCHOGOR,ANA LUIZA B.; BALDISSERA,MATHEUS D.; STEFANI,LENITA M.; SILVA,ALEKSANDRO S. DA.
Abstract: The aim of this study was to evaluate whether the use phytogenic as feed additive of Holstein calves could exert beneficial effects on animal health and performance. Thirty newborn calves were randomly divided into two groups (control and treated), and the treated consisted of 10 g of the phytogenic product diluted in milk once a day for 30 days. Blood and fecal samples were collected, and fecal score was performed daily in order to determine the occurrence of diarrhea. Treated calves showed higher hematocrit on days 45 and 60 of life. Serum levels of urea, total proteins, globulins and glucose were lower in the treated group on day 60 of life, while triglycerides were lower on days 15 and 60 of life. Serum glutathione S-transferase activity was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed; Metabolism; Calves; Oils; Nutrition; Animal health.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700804

The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil
Provedor de dados: 42
Autores: DIAS,FÁBIO L.; ASSUMPÇÃO,MARCELO; FACINCANI,EDNA M.; FRANÇA,GEORGE S.; ASSINE,MARIO L.; PARANHOS FILHO,ANTÔNIO C.; GAMARRA,ROBERTO M.
ABSTRACT The main goal of this paper is to characterize the Coxim earthquake occurred in June 15th, 2009 in the Pantanal Basin and to discuss the relationship between its faulting mechanism with the Transbrasiliano Lineament. The earthquake had maximum intensity MM V causing damage in farm houses and was felt in several cities located around, including Campo Grande and Goiânia. The event had an mb 4.8 magnitude and depth was 6 km, i.e., it occurred in the upper crust, within the basement and 5 km below the Cenozoic sedimentary cover. The mechanism, a thrust fault mechanism with lateral motion, was obtained by P-wave first-motion polarities and confirmed by regional waveform modelling. The two nodal planes have orientations (strike/dip) of 300°/55° and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Earthquake; Neotectonics; Intraplate stress; Pantanal basin; Focal mechanism.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401253

Distribution and habitat preference of Ephemeroptera and Trichoptera in subtropical mountain streams: implications for monitoring and conservation
Provedor de dados: 42
Autores: PRINCIPE,ROMINA E.; MÁRQUEZ,JAVIER A.; CIBILS-MARTINA,LUCIANA.
Abstract: The assessment of biotic-habitat relationships provides key information to predict biotic responses to perturbations and important tools for river management and monitoring. This study aimed to assess the spatial distribution of Ephemeroptera and Trichoptera in mountain streams of central Argentina. We evaluated the effect of seasonality and identified the variables conditioning the abundance of the assemblages and the habitat with the highest taxonomic richness. Sampling was carried out in four streams (Carcarañá River basin) during high and low water periods. Three lotic habitats were sampled: riffles, coarse substrate runs, and fine substrate runs; and physicochemical and habitat variables were measured. We found differences in assemblage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insects; Riffle; Run; Flow type; Substrate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500622

Active transcription and ultrastructural changes during Trypanosoma cruzi metacyclogenesis
Provedor de dados: 42
Autores: Ferreira,Ludmila R.P.; Dossin,Fernando de M.; Ramos,Thiago C.; Freymüller,Edna; Schenkman,Sergio.
The differentiation of proliferating epimastigote forms of Trypanosoma cruzi , the protozoan parasite that causes Chagas’ disease, into the infective and non-proliferating metacyclic forms can be reproduced in the laboratory by incubating the cells in a chemically-defined medium that mimics the urine of the insect vector. Epimastigotes have a spherical nucleus, a flagellum protruding from the middle of the protozoan cell, and a disk-shaped kinetoplast - an organelle that corresponds to the mitochondrial DNA. Metacyclic trypomastigotes have an elongated shape with the flagellum protruding from the posterior portion of the cell and associated with a spherical kinetoplast. Here we describe the morphological events of this transformation and characterize a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Metacyclogenesis; Transcription; RNA polymerase II.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100011

Global patterns of aboveground carbon stock and sequestration in mangroves
Provedor de dados: 42
Autores: ESTRADA,GUSTAVO C.D.; SOARES,MÁRIO L.G.
ABSTRACT In order to contribute to understand the factors that control the provisioning of the ecosystem service of carbon storage by mangroves, data on carbon stock and sequestration in the aboveground biomass (AGB) from 73 articles were averaged and tested for the dependence on latitude, climatic parameters, physiographic types and age. Global means of carbon stock (78.0 ± 64.5 tC.ha-1) and sequestration (2.9 ± 2.2 tC.ha-1.yr-1) showed that mangroves are among the forest ecosystems with greater capacity of carbon storage in AGB per area. On the global scale, carbon stock increases toward the equator (R²=0.22) and is dependent on 13 climatic parameters, which can be integrated in the following predictive equation: Carbon Stock in AGB = -16.342 + (8.341 x...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Carbon; Ecosystem services; Mangrove; Regression analysis; WorldClim.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300973

Chemical composition and antibacterial activity of essential oils from Citrus aurantifolia leaves and fruit peel against oral pathogenic bacteria
Provedor de dados: 42
Autores: LEMES,RAIANE S.; ALVES,CASSIA C.F.; ESTEVAM,ELISÂNGELA B.B.; SANTIAGO,MARIANA B.; MARTINS,CARLOS H.G.; SANTOS,TAINÁ C.L. DOS; CROTTI,ANTÔNIO E.M.; MIRANDA,MAYKER L.D.
ABSTRACT Tooth decay is a major public health problem which affects a large number of people in several countries. Even though more than 700 bacterial species have been detected in the oral cavity, Streptococcus and Lactobacillus stand out as the genera that cause tooth decay and other periodontal diseases. In this study, essential oils from Citrus aurantifolia leaves (CL-EO) and fruit peel (CP-EO) were obtained by hydrodistillation by a Clevenger-type apparatus whereas their chemical composition was analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS). Limonene (77.5 %), linalool (20.1 %), citronellal (14.5 %) and citronellol (14.2 %) were the main constituents found in the essential oils from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus aurantifolia; Limonene; Cariogenic bacteria; Essential oils; Oral pathogens.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401285

Anatomy and ontogeny of the pericarp of Pterodon emarginatus Vogel (Fabaceae, Faboideae), with emphasis on secretory ducts
Provedor de dados: 42
Autores: Paiva,Élder A.S.; Oliveira,Denise M.T.; Machado,Silvia R.
Discrepant and incomplete interpretations of fruits of Pterodon have been published, especially on the structural interpretation of the pericarp portion that remain attached to the seed upon dispersal. The present work clarified these doubts and analyzed ultrastructural aspects of the Pterodon emarginatus diaspores using light and transmission electron microscopes. Cell divisions are prevalent among the initial phases of development, and the subadaxial and adaxial meristems form the fibrous inner mesocarp and the endocarp composed of multi-seriate epidermis, respectively. At the median mesocarp, numerous secretory ducts differentiate between the lateral bundles, by lytic process. After lysis of the central cells and the formation of the lumen, the ducts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterodon emarginatus; Development; Fruit; Secretory duct; Resin; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300007

The configuration of the Brazilian scientific field
Provedor de dados: 42
Autores: BARATA,RITA B.; ARAGÃO,ERIKA; SOUSA,LUIS E.P. FERNANDES DE; SANTANA,TARIS M.; BARRETO,MAURICIO L.
This article describes the configuration of the scientific field in Brazil, characterizing the scientific communities in every major area of knowledge in terms of installed capacity, ability to train new researchers, and capacity for academic production. Empirical data from several sources of information are used to characterize the different communities. Articulating the theoretical contributions of Pierre Bourdieu, Ludwik Fleck, and Thomas Kuhn, the following types of capital are analyzed for each community: social capital (scientific prestige), symbolic capital (dominant paradigm), political capital (leadership in S &amp; T policy), and economic capital (resources). Scientific prestige is analyzed by taking into account the volume of production,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scientific community; Scientific field; Brazilian science; Scientific capital.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100505

Antiproliferative action of aqueous extracts of Hymenaea stigonocarpa Mart. (Fabaceae) on the cell cycle of Allium cepa L.
Provedor de dados: 42
Autores: LACERDA,LOURRAN P.; MALAQUIAS,GEIZ; PERON,ANA PAULA.
In this study we evaluated the action of crude aqueous extracts obtained from rhytidome of Hymenaea stigonocarpa (jatobá-do-cerrado) on Allium cepa meristematic root cells in three concentrations: 0.082, 0.164, 0.328g/mL, at exposure times of 24 and 48 h. The slides were prepared by the crushing technique, and cells analyzed throughout the cell cycle, totaling 5000 for each control group and concentration. It was found that all three concentrations, including the lowest which is considered ideal for use, in all exposure times, had significant antiproliferative action on the cell cycle of this test system. For cells under division, we observed a high number of cells in prophase. Therefore, under the conditions studied H. stigonocarpa indicated to be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Cellular division; Cells in prophase; Medicinal plant.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301147

Removal of the cortical projections alters expression of NOS in the different cell types of the superficial layers of the superior colliculus in rats
Provedor de dados: 42
Autores: TENÓRIO,FRANK; GIRALDI-GUIMARÃES,ARTHUR; MENDEZ-OTERO,ROSALIA.
Nitric oxide has several biological roles and nitric oxide synthase (NOS) is expressed in the nervous system, and co-localizes with NADPH-diaphorase. The superficial layers of the superior colliculus (SC), which receive retinal and cortical inputs, present NADPH-d staining in a sub-population of neurons that include all cell types. We have previously shown, by NADPH-diaphorase, that eye enucleation alters the intracellular distribution of NOS. Here, we studied the effect of cortical ablation on NOS expression by neurons in collicular superficial layers. Our results show that cortical ablation alters the proportion of different NOS-positive cell types, but not the intracellular distribution of the enzyme.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Superior colliculus; Nitric oxide; Visual cortex; NADPH-diaphorase.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400008

Removal of clay by stingless bees: load size and moisture selection
Provedor de dados: 42
Autores: COSTA-PEREIRA,RAUL.
Some organisms disperse energy, associated with the transportation of resource, which is not necessarily food. Stingless bees of Central Amazonia (Melipona flavolineata and M. lateralis) collect clay in banks along streams for nest building. The moisture of the clay varies along the bank, and bees collect clay from specific location, indicating that there is some sort of preference regarding their selection. This study aims at identifying: if larger bees carry more clay; if there is a preference for moisture of substrates; and if bees are less efficient accumulating and transporting clay when it is wet. In order to do so, I measured the size of the bees and of the pellets of clay found in the corbicula. I set up a field experiment to test substrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corbicula; Melipona; Substrate preference; Removal efficiency; Nest building.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301287

Occurrence of arbuscular mycorrhizal fungi on King George Island, South Shetland Islands, Antarctica
Provedor de dados: 42
Autores: BARBOSA,MARISÂNGELA V.; PEREIRA,ELISMARA A.; CURY,JULIANO C.; CARNEIRO,MARCO A.C.
ABSTRACT Arbuscular mycorrhizal fungi make up an important ecological niche in ecosystems, and knowledge of their diversity in extreme environments is still incipient. The objective of this work was to evaluate the density and diversity of arbuscular mycorrhizal fungi in the soil of King George Island in the South Shetland Islands archipelago, Antarctica. For that, soil and roots of Deschampsia antarctica were collected at the brazilian research station in Antarctica. The spore density, species diversity and mycorrhizal colonization in the roots were evaluated. There was a low density of spores (27.4 ± 17.7) and root mycorrhizal colonization (6 ± 5.1%), which did not present statistical difference. Four species of arbuscular mycorrhizal fungi were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antarctica; Deschampsia antarctica; Low temperatures; Mycorrhizal fungi.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401737

Spatial and Temporal Hydrochemical Variation of a Third Order River Network in a Quasi Pristine Coastal Watershed, at Southern Bahia, Brazil
Provedor de dados: 42
Autores: SOUZA,ELLY R.S. DE; PAULA,FRANCISCO C.F. DE.
ABSTRACTRio da Serra watershed presents well preserved fragments of rain forest at the headwaters and small farms at middle and final stretches. These features allowed the study of fluvial hydrochemistry, under quasi pristine conditions. Sampling stations were established in order to represent the basin, and visited during dry, intermediate and wet periods. Obtained results are: temperature (22.1 – 28.6 °C); electric conductivity (34 – 52 µS-cm); dissolved oxygen (35 – 110%); pH (3.8 – 7.7); total suspended solids (1.1 – 20 mg-L); chlorophyll (1.0 – 9.2 µg-L); total N (74 – 580 µmol-L); particulate N (60 – 550 µmol-L); N-NO3 (0.1 – 9.3 µmol-L); dissolved organic N (4 -70 µmol-L); total phosphorous (5.3 – 47 µmol-L); particulate P (4.4 – 59 µmol-L); P-PO4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rivers ecology; Dissolved nutrients; Biological reserve; Wetlands.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401357

Antiedematogenic activity of the indole derivative N-salicyloyltryptamine in animal models
Provedor de dados: 42
Autores: SOUSA-NETO,BENEDITO P.; GOMES,BRUNO S.; CUNHA,FRANCISCO V.M.; ARCANJO,DANIEL D.R.; GUTIERREZ,STANLEY J.C.; SOUZA,MARIA F.V.; ALMEIDA,FERNANDA R.C.; OLIVEIRA,FRANCISCO A.
ABSTRACT The N-salicyloyltryptamine (NST) is an indole derivative compound analogue to the alkaloid N-benzoyltryptamine. In the present study, the antiedematogenic activity of NST was investigated in animal models. Firstly, the acute toxicity for NST was assessed according to the OECD Guideline no. 423. The potential NST-induced antiedematogenic activity was evaluated by carrageenan-induced paw edema in rats, as well as by dextran-, compound 48/80-, histamine-, serotonin-, capsaicine-, and prostaglandin E2-induced paw edema in mice. The effect of NST on compound 48/80-induced ex vivo mast cell degranulation on mice mesenteric bed was investigated. No death or alteration of behavioral parameters was observed after administration of NST (2000 mg/kg, i.p.)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-inflammatory agents; Edema; Indoles; Inflammation mediators; N-salicyloyltryptamine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100185

Experimental models of 'Basement'-controlled salients - application to the proterozoic fold-thrust belt of the quadrilátero ferrífero (Minas Gerais, Southeastern Brazil)
Provedor de dados: 42
Autores: Gomes,Caroline J. S.; Pereira-Filho,Milton; Braga,Silvia C. M.
Scaled sandbox models are used to simulate the development of ´basement´-controlled, salients. We investigate the controlling factors on the development of closed curvatures in map-view, considering constant both the sand pack thickness and the space between obstacles. These models are compared with the Fundão-Cambotas Fault System in the Proterozoic fold-thrust belt in the Quadrilátero Ferrífero region, along the southeastern margin of the São Francisco craton. In the experiments, a pronounced curvature resulted from the margin-controlled salient process in the presence (i) of a basal ductile detachment, or (ii) of pre-existing structures. The results suggest that the convex-to-the-foreland, west-vergent Fundão-Cambotas Fault System that borders the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental modelling; Salients; Brittle deformation; Ductile deformation; Quadrilátero Ferrífero.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200010

The effect of temperature on the germination of Melocactus violaceus Pfeiff. (Cactaceae), a threatened species in restinga sandy coastal plain of Brazil
Provedor de dados: 42
Autores: ZAMITH,LUIZ R.; CRUZ,DENISE D.; RICHERS,BARBARA T.T.
Melocactus violaceus is an endangered species due to habitat destruction and the overcollection of this species for ornamental use. The aim of this study was to test the effect of different temperatures on the germination of M. violaceus. Three treatments were conducted: a constant temperature of 25ºC, a 20-35ºC alternating temperature, both inside germination chamber, and an alternating temperature under room temperature (mean temperature ranged from 25-37ºC). The final seed germination rates at the alternating temperature treatments were not significantly different (65% in the seed germinator and 62.5% at room condition). However, both treatments with alternating temperatures had significantly higher germination rates compared to the treatment kept at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactaceae; Conservation; Germination; Melocactus violaceus; Restinga; Temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200615

Development and evaluation of an inhalation chamber for in vivo tests
Provedor de dados: 42
Autores: SILVA,EDUARDO R. DA; BIZZO,HUMBERTO R.; FERNANDES,PATRÍCIA D.; VEIGA JUNIOR,VALDIR F. DA; LEITÃO,SUZANA G.; OLIVEIRA,DANILO R. DE.
ABSTRACT The bioavailability, toxicity, and therapeutic efficacy of a drug is directly related to its administration route. The pulmonary route can be accessed by inhalation after fumigation, vaporization or nebulization. Thus, pharmacological and toxicological evaluation accessed by an apparatus specifically designed and validated for this type of administration is extremely important. Based on pre-existing models, an inhalation chamber was developed. This presents a central structure with five animal holders. The nebulized air passes directly and continuously through these holders and subsequently to an outlet. Evaluation of its operation was performed using clove essential oil, a nebulizer, and a flow meter. The air within the chamber was collected by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological activities; Gas chromatograph; Headspace; Inhalation chamber; Syzygium aromaticum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401643

Probiotic, antibiotic and combinations in Nile tilapia juveniles culture
Provedor de dados: 42
Autores: FERREIRA,ANDRE L.; AMORIM,MATHEUS P.S.; SOUZA,EMILENE R.; SCHORER,MARIANNE; CASTRO,GUSTAVO H.F.; PEDREIRA,MARCELO M.
Abstract: This study aimed to evaluate the effect of the commercial probiotic (Saccharomyces cerevisiae), antibiotic (florfenicol), and its combination for Nile tilapia culture. The experiment was arranged in a completely randomized design with five replications, and five treatments diets: Control: water and diet without additives; YD: yeast in the diet (1 g Kg-1); AW: antibiotic in the water (0.002 g L-1); AWYD: antibiotic in the water, and yeast in the diet (0.002 g L-1 and 1 g Kg-1); and AD: antibiotic in the diet (0.01 g kg-1). The growth parameters as total and standard length, weight, weight gain, biomass, Fulton’s condition factor, specific growth rate and plasma cortisol of tilapia did not show the difference between the treatments. The survival...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Florfenicol; Yeast; Prebiotic and probiotic; Growth promoter.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700856

Mode of life of the macrofossils from the cabeças formation (Devonian), Parnaíba Basin, Brazil
Provedor de dados: 42
Autores: SILVA,CLEBER F. DA; MACHADO,DEUSANA M.C.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200010

Mitochondria-rich cells changes induced by nitrite exposure in tambaqui (Colossoma macropomum Cuvier, 1818)
Provedor de dados: 42
Autores: COSTA,OSCAR T.F. DA; RAMOS,CLEVERSON A.; DUNCAN,WALLICE P.; LAMEIRAS,JULIANA L.V.; FERNANDES,MARISA N.
ABSTRACT The gill mitochondria-rich cells of the juvenile Amazonian fish Colossoma macropomum were analyzed using light and scanning and transmission electron microscopy after 96 h exposure to 0.04 and 0.2 mM nitrite. Although the number of mitochondria-rich cells decreased significantly in the lamellar epithelium, no decrease was found in the interlamellar region of the gill filament. Nitrite exposure caused significant reduction on the apical surface area of individual mitochondria-rich cells (p &lt; 0.05), with a resulting reduction of the fractional area of these cells in both the lamellar and filament epithelium. Swelling of endoplasmic reticulum cisternae, nuclear envelope and mitochondria were the main changes found in the mitochondria-rich cells....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell damage; Fish; Gills; Morphometry; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300965

Trans fatty acid-forming processes in foods: a review
Provedor de dados: 42
Autores: Martin,Clayton A.; Milinsk,Maria C.; Visentainer,Jesuí V.; Matsushita,Makoto; de-Souza,Nilson E.
There is a mounting concern about the intake of foods containing trans fatty acids (TFA) due to their deleterious effects on human health, mainly on the cardiovascular system. In this way, it is important to consider the processes that form TFA in foods, and the alternatives to minimize them. Among the processes that result in the formation of TFA, the hydrogenation of vegetable oils stands out for its impact on the diet of people living in industrialized countries. Other processes such as edible oil refining, meat irradiation, food frying, and biohydrogenation also contribute to increase the daily intake of TFA.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trans fatty acids; Partial hydrogenation; Deodorization; Frying; Irradiation; Biohydrogenation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200015

Does ethnic ancestry play a role in smoking?
Provedor de dados: 42
Autores: SOUZA,ELISA S.T. DE; ARAÚJO,LUIZA F. DE; ALENCAR,DAYSE O. DE; SANTOS,SIDNEY E.B. DOS; SILVA Jr,WILSON A.; FERREIRA,CRISTIANE A.; BADDINI-MARTINEZ,JOSÉ.
The higher proportion of smokers among Black people in Brazil has been attributed to socioeconomic disparities, but genetic factors could also contribute for this finding. This study aimed at investigating associations between smoking status with genetically defined ethnic ancestry and socioeconomic features in Brazilians. Blood samples were collected from 448 volunteers (66.7% male; age: 37.1±11.4 years) classified as current smokers (CS: 60.9%), former smokers (FS: 8.9%) and never smokers (NS: 30.1%). Individual interethnic admixtures were determined using a 48 insertion-deletion polymorphisms ancestry-informative-marker panel. CS showed a lower amount of European ancestry than NS (0.837±0.243 X 0.883±0.194, p≤0.05) and FS (0.837±0.243 X 0.864±0.230,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Smoking; Ethnicity and health; Genetics; CYP2A6.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100447

Three new species of Cladonia (Cladoniaceae, Ascomycota) from Southern Brazil
Provedor de dados: 42
Autores: CHARNEI,ANA M.; ELIASARO,SIONARA; GUMBOSKI,EMERSON L.
Cladonia maculata, C. paranaensis and C. quiririensisare described as new to science. These species were found between the altitudes of 900 to 1887 meters on the Serra do Mar Mountain in Southern Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lichen; Paraná; Santa Catarina; Serra do Mar; Taxonomy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100101

Practical rules for summing the series of the Tweedie probability density function with high-precision arithmetic
Provedor de dados: 42
Autores: DIAS,NELSON L.; RIBEIRO JR,PAULO J.
Abstract: For some ranges of its parameters and arguments, the series for Tweedie probability density functions are sometimes exceedingly difficult to sum numerically. Existing numerical implementations utilizing inversion techniques and properties of stable distributions can cope with these problems, but no single one is successful in all cases. In this work we investigate heuristically the nature of the problem, and show that it is not related to the order of summation of the terms. Using a variable involved in the analytical proof of convergence of the series, the critical parameter for numerical non-convergence (“alpha”) is identified, and an heuristic criterion is developed to avoid numerical non-convergence for a reasonably large sub-interval of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Python; R Tweedie package; Tweedie probability density; Tweedie series.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700902

Production of lipolytic enzymes by bacteria isolated from biological effluent treatment systems
Provedor de dados: 42
Autores: FURINI,GRACIANE; BERGER,JUSSARA S.; CAMPOS,JOSÉ A.M.; SAND,SUELI T. VAN DER; GERMANI,JOSÉ C.
Abstract This work aimed to evaluate the production of lipolytic complexes, produced by microorganisms isolated from a biological treatment system of effluents from a hotel. To select the best lipolytic microorganism for use in biotechnological processes, we tested 45 bacterial isolates recovered from the raw effluent of the hotel’s restaurant waste tank. Lipase production was assayed in culture medium supplemented with olive oil and rhodamine B, incubated at 25 °C and 30 °C for 24 h - 48 h. Results showed 22 isolates lipase producers. All isolates were inoculated on medium without yeast extract to select the ones with highest enzyme yields. Out of these, nine isolates showed high lipase activity. The strain with the larger halo was assayed in submerged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipolytic enzymes; Bacteria; Submerged culture; Wastewater.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602955

The use of rocks to improve family agriculture in Brazil
Provedor de dados: 42
Autores: Theodoro,Suzi H.; Leonardos,Othon H.
During the second half of the 20th century, the introduction of new chemical agriculture technologies brought about a revolution in food production, but this has also cause deep deterioration in our relationships with the natural environment. In developing tropical countries, record yields were accompanied by rural exodus, widespread deforestation and loss of topsoil. The stonemeal research described herein is an alternative to such practices as it is an environmental friendly and socially responsible technology based on soil rejuvenation and conservation by means of the addition of natural rock powders that are rich in phosphorous, calcium, magnesium, potassium and micronutrients. The research adopted an inter-disciplinary approach and was conducted among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stonemeal; Nutrients; Small farmers.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400008

The expression of neotectonics in the Pantanal da Nhecolândia, State of Mato Grosso do Sul - Brazil
Provedor de dados: 42
Autores: OLIVEIRA,ANA PAULA G.; MACHADO,RÔMULO; RIBEIRO,ALISSON A.; MIOTO,CAMILA L.; MARCATO JÚNIOR,JOSÉ; SAAD,ANTONIO R.; SÍGOLO,JOEL B.; PARANHOS FILHO,ANTONIO C.
ABSTRACT Pantanal da Nhecolândia is one of the most well-preserved areas in the State of Mato Grosso do Sul. Located in the southern part of the Taquari River megafan, it is in tectonic contact with the fault escarpments of the Maracaju-Campo Grande plateaus to the east and with the fault escarpments of the Bodoquena plateau to the west, which continue to north. To the south and to the north, the limits are marked respectively by the lineaments of the Negro and Taquari Rivers. Nhecolândia is characterized by the existence of at least 17,631 lagoons, 17,050 (96.70 %) of which are of fresh water (baías) and 577 (3.3 %) of salty water (salinas). Studies based on (Landsat) satellite images and use of free software (QGIS, version 2.8.3) and GIS (Geographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Structural lineaments; Nhecolândia; Lagoon alignment; Landsat Images; QGIS.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401293

Evidence on the use of internet for businesses by MSEs in a Developing Country. The Indonesian case
Provedor de dados: 42
Autores: TAMBUNAN,TULUS T.H.
Abstract  This study aims to examine the development of Indonesian micro and small enterprises (MSEs) in utilizing the internet for their businesses. This is a descriptive study in nature, which analyses secondary data on MSMEs. It also reviews key literature on the use of ICT by MSMEs in developing countries. It shows that MSMEs, dominated by MSEs, have been the main player in Indonesian domestic economic activities as they accounted for more than 90 per cent of all firms and contributed to more than 50 per cent of gross domestic product (GDP). But, only a small fraction of total MSEs in Indonesia that utilize the internet for business, and the intensity of internet usage by MSEs varies by province and type of business. This is the first macro-level study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micro; Small and medium enterprises (MSMEs); Micro and small enterprises (MSEs); Internet; Information and communication technology (ICT); E-commerce.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101202

Serra Pelada: the first Amazonian Meteorite fall is a Eucrite (basalt) from Asteroid 4-Vesta
Provedor de dados: 42
Autores: ZUCOLOTTO,MARIA ELIZABETH; TOSI,AMANDA A.; VILLAÇA,CAIO V.N.; MOUTINHO,ANDRÉ L.R.; ANDRADE,DIANA P.P.; FAULSTICH,FABIANO; GOMES,ANGELO M.S.; RIOS,DEBORA C.; ROCHA,MARCILIO C.
ABSTRACT Serra Pelada is the newest Brazilian eucrite and the first recovered fall from Amazonia (State of Pará, Brazil, June 29th 2017). In this paper, we report on its petrography, chemistry, mineralogy and its magnetic properties. Study of four thin sections reveals that the meteorite is brecciated, containing basaltic and gabbroic clasts, as well of recrystallized impact melt, embedded into a fine-medium grained matrix. Chemical analyses suggest that Serra Pelada is a monomict basaltic eucritic breccia, and that the meteorite is a normal member of the HED suite. Our results provide additional geological and compositional information on the lithological diversity of its parent body. The mineralogy of Serra Pelada consists basically of low-Ca pyroxene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Serra Pelada; Meteorite; Eucrite; Vesta; Brazilian Meteorite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100003

Floristic units and their predictors unveiled in part of the Atlantic Forest hotspot: implications for conservation planning
Provedor de dados: 42
Autores: SAITER,FELIPE Z.; EISENLOHR,PEDRO V.; FRANÇA,GLAUCO S.; STEHMANN,JOÃO R.; THOMAS,WILLIAM W.; OLIVEIRA-FILHO,ARY T. DE.
ABSTRACT We submitted tree species occurrence and geoclimatic data from 59 sites in a river basin in the Atlantic Forest of southeastern Brazil to ordination, ANOVA, and cluster analyses with the goals of investigating the causes of phytogeographic patterns and determining whether the six recognized subregions represent distinct floristic units. We found that both climate and space were significantly (p ≤ 0.05) important in the explanation of phytogeographic patterns. Floristic variations follow thermal gradients linked to elevation in both coastal and inland subregions. A gradient of precipitation seasonality was found to be related to floristic variation up to 100 km inland from the ocean. The temperature of the warmest quarter and the precipitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytogeographic patterns; Environmental gradients; Spatial autocorrelation; Doce River basin.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502031

Genetic divergence among accessions of Axonopus jesuiticus x A. scoparius based on morphological and agronomical traits
Provedor de dados: 42
Autores: SCHEFFER-BASSO,SIMONE M.; FAVARETTO,ADRIANA; FELINI,VANDERLEIA; GOMES,CLAUDINEI C.; CARNEIRO,LUIS E.; CECCHIN,KALINCA.
This study had the objective of assessing the genetic divergence in giant missionary grass (Axonopus jesuiticus x A. scoparius) germplasm based on morphological and agronomic traits. Five accessions were evaluated in the field: V14337, V14403, V14404, V14405 and V14406. Three contrasting groups were formed using the UPGMA clustering method: V14337 and V14404 formed one group, V14403 and V14405 formed another, and V14406 was isolated from the other accessions. The most striking traits for the identification of the accessions were the height of the plant and the change color of the leaf. Only V14406 accession had purplish green leaves. The other four accessions differed with regards to plant height and dry matter production, with superiority of V14337 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Canopy structure; Giant missionary grass; Morphological traits; Nutritive value.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100475

On the other law of the iterated logarithm for self-normalized sums
Provedor de dados: 42
Autores: Cai,Guang-Hui.
Inthisnote, we obtain a Chung's integral test for self-normalized sums of i.i.d. random variables. Furthermore, we obtain a convergence rate of Chung law of the iterated logarithm for self-normalized sums.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chung's integral test; Self-normalized sums; Convergence rate.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300002

Translation Hypersurfaces with Constant Sr Curvature in the Euclidean Space
Provedor de dados: 42
Autores: Lima,Barnabé P.; Santos,Newton L.; Silva,Juscelino P.; Sousa,Paulo A.A.
Abstract The main goal of this paper is to present a complete description of all translation hypersurfaces with constant   r-curvature    S r, in the Euclidean space    ℝ  n + 1, where    3 ≤ r ≤  n - 1.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euclidean space; Scherk's surface; Translation hypersurfaces; R-Curvature.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602039

Antioxidant status in women with uterine leiomyoma: relation with sex hormones
Provedor de dados: 42
Autores: PEJIĆ,SNEŽANA; TODOROVIĆ,ANA; STOJILJKOVIĆ,VESNA; GAVRILOVIĆ,LJUBICA; POPOVIĆ,NATAŠA; PAJOVIĆ,SNEŽANA B.
ABSTRACTUterine leiomyomas are benign soft-tissues tumors that arise from uterine smooth muscle tissue. Etiopathogenesis of leiomyomas is not well understood. We aimed to examine whether antioxidant enzyme activities and lipid hydroperoxides level in patients with leiomyoma are influenced by changes in sex hormones and gonadotropins (estradiol (E2), progesterone, FSH, and LH) during menstrual cycle and in postmenopause. The material consisted of blood and uterine tissue specimens. Hormone concentrations were determined and assays for superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase activities and lipid hydroperoxides concentration were performed. In blood of examined women, a significant difference in catalase, glutathione...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Lipid hydroperoxides; Sex steroids; Leiomyoma.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401771

Folk uses and pharmacological properties of Casearia sylvestris: a medicinal review
Provedor de dados: 42
Autores: Ferreira,Paulo Michel P.; Costa-Lotufo,Leticia V.; Moraes,Manoel O.; Barros,Francisco W.A.; Martins,Aline M.A.; Cavalheiro,Alberto J.; Bolzani,Vanderlan S.; Santos,Andre G.; Pessoa,Claudia.
Folk uses and scientific investigations have highlighted the importance of Casearia sylvestris extracts and their relevant bioactive potential. The aim of this work was to review the pharmacological properties of C. sylvestris, emphasizing its anti-ulcer, anti-inflammatory, anti-ophidian and antitumor potentialities. Ethanolic extracts and essential oil of their leaves have antiulcerogenic activity and reduce gastric volume without altering the stomach pH, which corroborates their consumption on gastrointestinal disorders. Leaf water extracts show phospholipase A2 inhibitory activity that prevents damage effects on the muscular tissue after toxin inoculation. This antiphospholipasic action is probably related to the use as an anti-inflammatory, proposing a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Casearia sylvestris; Folk uses; Pharmacological properties.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400024

Early molecular markers predictive of dengue hemorrhagic fever
Provedor de dados: 42
Autores: Calzavara-Silva,Carlos E.; Gomes,Ana L.V.; Maia,Rita C.C.; Acioli-Santos,Bartolomeu; Gil,Laura H.V.G.; Marques Jr.,Ernesto T.A.
The management of acute dengue patients during outbreaks is a challenging problem. Most of the dengue fever cases are benign, but some cases develop into a severe and possibly lethal vasculopathy, known as dengue hemorrhagic fever. Early symptoms of dengue and hemorrhagic fever are very similar. An early differential diagnosis is needed to predict which of these two clinical presentations is crucial to proper patient care and public health management. This study evaluates the predictive potential of specific mRNA expression markers of dengue hemorrhagic fever using quantitative real-time PCR assays. Six candidate "dengue hemorrhagic fever specific signature genes" were evaluated and all showed good correlation among their transcription levels at early days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Real-time PCR; Dengue hemorrhagic fever; Molecular markers.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400006

Hybrid Geoid Model: Theory and Application in Brazil
Provedor de dados: 42
Autores: ARANA,DANIEL; CAMARGO,PAULO O.; GUIMARÃES,GABRIEL N.
Determination of the ellipsoidal height by Global Navigation Satellite Systems (GNSS) is becoming better known and used for purposes of leveling with the aid of geoid models. However, the disadvantage of this method is the quality of the geoid models, which degrade heights and limit the application of the method. In order to provide better quality in transforming height using GNSS leveling, this research aims to develop a hybridization methodology of gravimetric geoid models EGM08, MAPGEO2015 and GEOIDSP2014 for the State of São Paulo, providing more consistent models with GNSS technology. Radial Basis Function (RBF) neural networks were used to obtain the corrector surface, based on differences between geoid model undulations and the undulations obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EGM08; GEOIDSP2014; GNSS leveling; MAPGEO2015; Neural network.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401943

The behavior of Aphis gossypii and Aphis craccivora (Hemiptera: Aphididae) and of their predator Cycloneda sanguinea (Coleoptera: Coccinellidae) in cotton-cowpea intercropping systems
Provedor de dados: 42
Autores: FERNANDES,FRANCISCO S.; GODOY,WESLEY A.C.; RAMALHO,FRANCISCO S.; MALAQUIAS,JOSÉ B.; SANTOS,BÁRBARA D.B.
ABSTRACT The intercropping is an important cultural practice commonly used in pest management. It is based on the principle that increased plant diversity in the agro-ecosystem can lead to reductions of pest populations in the crop. The current study aimed to assess the impact the colored fiber cotton-cowpea intercropped systems on Aphis gossypii and Aphis craccivora and on their predator Cycloneda sanguinea and the losses and the dispersion behavior of these aphids and their predator in these cropping systems. The experiment had a randomized block experimental design with two bioassays and four treatments. The number of apterous and alate aphids (A. gossypii) per cotton plant was 1.46 and 1.73 or 1.97 and 2.19 times highest in the solid cotton system than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphids; Cowpea; Cotton; Behavior; Intercropping.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100373

Marine influence in the Barreiras Formation, State of Alagoas, northeastern Brazil
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.
Tidal processes were important for deposition of the Barreiras Formation located in northern Brazil, while correlatable deposits in northeastern Brazil have been traditionally related to continental environments. Facies analysis in southern Alagoas revealed that the Barreiras Formation consists of cross-stratified conglomerates and sandstones (facies Sx and Cgx), compound cross-stratified sandstones (facies Cx), and heterolithic beddings (facies H). A significant portion of these deposits occurs within channel morphologies displaying fining and thinning upward successions. An abundance of sedimentary features is comparable to those from the northern Brazilian counterpart. These include: tidal bundles; herringbone cross-stratification; heterolithic beddings...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miocene; Marine transgression; Tidal currents; Sedimentary structures; Northeastern Brazil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400012

Is the brazilian diverse environment is a crib for the emergence and maintenance of exotic arboviruses?
Provedor de dados: 42
Autores: MEDEIROS,DANIELE B.A.; VASCONCELOS,PEDRO FERNANDO C.
Abstract: We review the potential of Amazon forest as a source for circulation and maintenance of native arboviruses as well its capacity to host exotic arboviruses introduced in Brazil during their process of adapting to the Amazon environment. After a brief introduction about arboviruses isolated in Amazon region and description of the main arboviruses pathogenic to humans, we highlight the history of the last two exotic viruses introduced in Brazil - Chikungunya virus (CHIKV) and Zika virus (ZIKV) - and their consequences to the public health. Finally, we discuss and hypothesize what will happen with them after the outbreak. We look to the past to predict the future.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arboviruses; New introduction; Zika; Chikungunya.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600701

Singular surfaces of revolution with prescribed unbounded mean curvature
Provedor de dados: 42
Autores: LUCIANA F.,MARTINS; SAJI,KENTARO; SANTOS,SAMUEL P. DOS; TERAMOTO,KEISUKE.
Abstract: We give an explicit formula for singular surfaces of revolution with prescribed unbounded mean curvature. Using this mean curvature, we give conditions for certain types of singularities of those surfaces. Periodicity of that surface is also discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cuspidal edge; Mean curvature; Periodicity surface of revolution; Cusps.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500203

Antimicrobial activity of apitoxin, melittin and phospholipase A2 of honey bee (Apis mellifera) venom against oral pathogens
Provedor de dados: 42
Autores: Leandro,Luís F.; Mendes,Carlos A.; Casemiro,Luciana A.; Vinholis,Adriana H.C.; Cunha,Wilson R.; Almeida,Rosana de; Martins,Carlos H.G.
In this work, we used the Minimum Inhibitory Concentration (MIC) technique to evaluate the antibacterial potential of the apitoxin produced by Apis mellifera bees against the causative agents of tooth decay. Apitoxin was assayed in naturaand in the commercially available form. The antibacterial actions of the main components of this apitoxin, phospholipase A2, and melittin were also assessed, alone and in combination. The following bacteria were tested: Streptococcus salivarius, S. sobrinus, S. mutans, S. mitis, S. sanguinis, Lactobacillus casei, and Enterococcus faecalis. The MIC results obtained for the commercially available apitoxin and for the apitoxin in natura were close and lay between 20 and 40µg / mL, which indicated good antibacterial activity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial activity; Apitoxin; Melittin; Phospholipase A2; Tooth decay; Oral pathogens.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100147

Modification of the Alere GIARDIA Ag TEST immunochromatography KIT methodology for its use in frozen fecal sediment of dogs and cats
Provedor de dados: 42
Autores: COSTA,VIVIANE A.N.; BRENER,BEATRIZ; FONSECA,ANA BEATRIZ M.; SUDRÉ,ADRIANA P.
ABSTRACT Giardia duodenalis is a worldwide intestinal parasite and is one of the most frequent protozoa species infecting dogs and cats. This study aimed to modify the methodology of Alere GIARDIA Ag TEST KIT for its use in frozen fecal sediments with different storage times in a freezer (-20°C), thus expanding the range of use of this methodology. One hundred fecal sediments from dogs (n=50) and cats (n=50) previously examined by optical microscopy for Giardia cysts were selected for this study. The agreement between the modified immunochromatography and microscopy results was calculated by Kappa coefficient. To evaluate the performance of the modified immunochromatography assay on samples with different storage time, the fecal sediments were divided into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cats; Diagnosis; Dogs; Giardia duodenalis; Immunochromatography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100479

Effect of environmental factors on the abundance of decapod crustaceans from soft bottoms off southeastern Brazil
Provedor de dados: 42
Autores: FURLAN,MICHELE; CASTILHO,ANTONIO L.; FERNANDES-GÓES,LISSANDRA C.; FRANSOZO,VIVIAN; BERTINI,GIOVANA; COSTA,ROGéRIO C. DA.
This study investigated the importance of variations in environmental factors affecting the abundance patterns of decapods on the southeastern Brazilian coast. Sampling was carried out monthly from January 1998 through December 1999 in Ubatumirim and Mar Virado, Ubatuba region, using a commercial shrimp fishing boat equipped with double-rig nets. Six areas adjacent to rocky shores were chosen. Bottom-water samples were collected using a Nansen bottle, to measure the temperature and salinity. Sediment samples were also obtained by means of a Van Veen grab, for determination of texture and organic-matter content. The association of environmental factors with species abundance was evaluated by Canonical Correspondence Analysis (α = 0.05). Forty-one species of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic species; Decapod crustaceans; Environmental factors; Habitat selection.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401345

Perspectives of Dendrimer-based Nanoparticles in Cancer Therapy
Provedor de dados: 42
Autores: CASTRO,RICARDO I.; FORERO-DORIA,OSCAR; GUZMÁN,LUIS.
Abstract Currently, cancer is the second most common cause of death in the United States, exceeded only by heart disease. Chemotherapy traditionally suffers from a non-specific distribution, with only a small fraction of the drug reaching the tumor, in this sense, the use of dendrimers incorporating drugs non-covalently encapsulated inside the dendrimer or covalently conjugated have proven to be effectives against different cancer cell lines. However, at present the dendrimers used as drug-carriers still do not meet the necessary characteristic to be considered as an ideal dendrimer for drug delivery; high toxicity, bio-degradability, low toxicity, biodistribution characteristics, and favorable retention with appropriate specificity and bioavailability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendrimers; Cancer therapy; Pharmacodynamics; Nanoparticles.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502331

Porphyrinosilica and metalloporphyrinosilica: hybrid organic-inorganic materials prepared by sol-gel processing
Provedor de dados: 42
Autores: IAMAMOTO,YASSUKO; SACCO,HÉRICA C.; BIAZZOTTO,JULIANA C.; CIUFFI,KATIA J.; SERRA,OSVALDO A.
New materials porphyrinosilica and metalloporphyrinosilica template have been obtained by a sol-gel processing where functionalyzed porphyrins and metalloporphyrins "building blocks" were assembled into a three-dimensional silicate network. The optimized conditions for preparation of these materials are revised. The monomer precursors porphyrinopropylsilyl and metalloporphyrinopropylsilyl preparation reactions and subsequent one pot sol-gel processing with tetraethoxysilane are discussed. In the case of metalloporphyrins the nitrogen base coordinates to the central metal and acts as a template in the molecular imprinting technique. UV-visible absorption spectroscopy, thermogravimetric analysis, electron paramagnetic resonance, nuclear magnetic spectra,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metalloporphyrin silica; Sol-gel; Catalysis; Hybrid material.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100008

Sward structure and nutritive value of Alexandergrass fertilized with nitrogen
Provedor de dados: 42
Autores: Salvador,Paulo R.; Pötter,Luciana; Rocha,Marta G.; Hundertmarck,Anelise P.; Sichonany,Maria José O.; Amaral Neto,Luiz G.; Negrini,Mateus; Moterle,Paulo H.
This experiment evaluated forage production, sward structure, stocking rate, weight gain per area and nutritive value of forage as grazed by beef heifers on Alexandergrass (Urochloa plantaginea (Link) Hitch) pasture fertilized with nitrogen (N): 0; 100; 200 or 300 kg of N/ha. The experiment was a completely randomized design following a repeated measurement arrangement. The experimental animals were Angus heifers with initial age and weight of 15 months and 241.5±5 kg, respectively. The grazing method was continuous, with put-and-take stocking. N utilization, regardless of the level, increase by 25% the daily forage accumulation rate and the weight gain per area by 23%. The level of 97.2 kg N/ha leads to a higher leaf blade mass and increases by 20% the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf blade mass; Leaf:steam ratio; Hand plucking; Urochloa plantaginea (Link) Hitch.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100385

Assessment of scientific programs: a necessary procedure for Brazilian scientific policy - the Young Investigator Program of the State of São Paulo Research Foundation
Provedor de dados: 42
Autores: Pian,Carlos A. de; Meneghini,Rogerio.
Programs of Science and Technology research have grown significantly in Brazil over the last decades. Until the 1980s the so-called undirected programs, without specific goals and requiring only scientific merit, prevailed. The few programs with defined goals in this period were never objectively assessed. The same situation occurred in developed countries. In the early 1990s, the assessment of programs supported by public funding became mandatory in US and some European countries. In Brazil, program assessment has so far not been implemented yet. The Fundação de Amparo à Pesquisa no Estado de São Paulo (FAPESP) (Brazilian funding agency) Young Investigator (YI) Program is in its eleventh year, with approximately eight hundred projects awarded. Although it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaluation; Assessment of scientific programs; Scientific production; Statistical sampling.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300014

Tunasniyoj, a dinosaur tracksite from the Jurassic-Cretaceous boundary of Bolivia
Provedor de dados: 42
Autores: Apesteguía,Sebastián; Gallina,Pablo A.
Here we report a superbly preserved and profusely represented five-ichnotaxa dinosaur track assemblage near Icla village, 100 km southeast of Sucre, Bolivia. As preserved in reddish Jurassic-Cretaceous boundary aeolian sandstones, this rich and uncommon assemblage is, additionally, the oldest dinosaur tracksite for Bolivia. Four trackmakers were identified in the area: three quadrupedal and one bipedal, all of them with tracks of around 35 cm in lenght. One of the quadrupedals is represented by no less than five adult individuals (ichnotaxon A), and four purported juveniles (ichnotaxon B) walking in association. The other two quadrupedals (ichnotaxa C and D) involve four trackways, and the last, the bipedal trackmaker (ichnotaxon E), is represented by one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bolivia; Chuquisaca; Dinosaur prints; Ichnology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100015

E-commerce adoption in Malaysian Small and Medium Enterprises Practitioner Firms: A revisit on Rogers' model
Provedor de dados: 42
Autores: POORANGI,MEHDI M.; KHIN,EDWARD W.S.; NIKOONEJAD,SHOHREH; KARDEVANI,ARASH.
The current climate of business necessitates competitions that are often tough and unpredictable. All organizations, regardless their size and scope of operation, are facing severe competitive challenges. In order to cope with this phenomenon, managers are turning to e-commerce in their respective organizations. The present study hinges upon exploring and explaining the different dimensions of the adoption of e-commerce among Small and medium enterprises, based on the Five Factors of Diffusion of Innovation Model derived by Rogers. In this study, however, we employed the survey methods. A questionnaire was distributed to 1,200 managers and employees in the manufacturing, service and agricultural sectors by email; with a response rate of 10%. The results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: E-commerce adoption; SMEs; Rogers Model; Diffusion of innovation; E-business.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401593

Carbon isotope fluctuations in Precambrian carbonate sequences of several localities in Brazil
Provedor de dados: 42
Autores: SIAL,ALCIDES N.; FERREIRA,VALDEREZ P.; DEALMEIDA,AFONSO R.; ROMANO,ANTONIO W.; PARENTE,CLOVIS V.; DACOSTA,MARCONDES L.; SANTOS,VICTOR H.
Carbon isotope fluctuations in Precambrian sedimentary carbonates between 2.8 Ga and 0.60 Ga in Brazil are examined in this study. The carbonate facies of the BIF of the 2.8 Ga-old Carajás Formation, state of Pará in northern Brazil, has rather homogeneous delta13C (-5 o/ooPDB), compatible with carbonatization of a silicate protolith by a CO2-rich fluid from mantle degassing. The Paleoproterozoic Gandarela Formation, state of Minas Gerais, displays a narrow delta13C variation (-1.5 to +0.5 o/oo) compatible with carbon isotope signatures of carbonates deposited around 2.4 Ga worldwide. The Fecho do Funil Formation has probably recorded the Lomagundi delta13C positive anomaly (+6.4 to +7.1 o/ooPDB). The magnesite-bearing carbonates of the Orós mobile belt,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon isotopes; Carbonates; Chemostratigraphy; Archean; Paleoproterozoic; Neoproterozoic.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400006

Propolis from Southwest of Parana produced by selected bees: Influence of seasonality and food supplementation on antioxidant activity and phenolic profile
Provedor de dados: 42
Autores: CALEGARI,MATHEUS A.; PRASNIEWSKI,ANACLARA; SILVA,CLEIDIANE DA; SADO,RICARDO Y.; MAIA,FABIANA M.C.; TONIAL,LARISSA M.S.; OLDONI,TATIANE L.C.
ABSTRACT Propolis produced by selected bees Apis mellifera were collected from March to June of 2013 and in March of 2015 and analyzed in order to evaluate the influence of climate, colony of origin, and food supplementation of colonies on the content of total phenolic and flavonoid by chromatographic analysis and antioxidant activity by radical scavenging of 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and ferric reducing antioxidant power (FRAP) methods. The Principal Component Analysis (PCA) was carried out with propolis collected in 2013 and two clusters were formed. Propolis produced in the months of March and April showed a higher content of total phenolic compounds (TPC) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Ethanolic extract; Polyphenols; Principal component analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100045

Apis mellifera pollination improves agronomic productivity of anemophilous castor bean (Ricinus communis)
Provedor de dados: 42
Autores: Rizzardo,Rômulo A.G.; Milfont,Marcelo O.; Silva,Eva M.S. da; Freitas,Breno M.
Castor bean (Ricinus communis L.) is cultivated mainly for biodiesel production because of its oil-rich seeds; it is assumed to be an anemophylous species. But pollination deficit can lead to low productivity often attributed to other reasons. In this paper, we investigated pollination requirements, pollination mechanism, occurrence of pollination deficit, and the role of biotic pollinators in a large commercial plantation of castor bean. Our results show that R. communis bears a mixed breeding system favoring selfing by geitonogamy, although the wind promotes mostly outcrossing. We also found that the honey bee (Apis mellifera L.) foraging on castor bean can both transfer pollen from male to female flowers within the same raceme and boost the release of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oleaginous crop; Pollination deficit; Pollination requirements; Seed yield; Wind insect-assisted pollination.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400028

The classic episode of biological invasion: Cochliomyia macellaria (Fabricius, 1775) versus Chrysomya megacephala (Fabricius, 1794) (Diptera: Calliphoridae) - evaluation of the biotic potential
Provedor de dados: 42
Autores: BARBOSA,LEANDRO S.; COURI,MÁRCIA S.; COELHO,VALÉRIA M.A.; AVELINO-CAPISTRANO,FERNANDA.
ABSTRACT The classic episode of biological invasion: Cochliomyia macellaria (Fabricius, 1775) versus Chrysomya megacephala (Fabricius, 1794) (Diptera: Calliphoridae) - evaluation of the biotic potential. The biotic of the native fly Cochliomyia macellaria and the exotic Chrysomya megacephala was compared, through the reproductive capacity and longevity. The experiment took place in a climatized chamber, with four repetitions of 15 grouped couples of each species. The posture, egg mass weight, and death of individuals were observed daily. C. macellaria showed an average of longevity of 27.72 days while in C. megacephala the average was 41.96 days. The egg mass weight average per repetition was 0.58 g and 1.22 g, respectively. These results give a better...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breed capacity; Longevity; Competition; Caliphorids.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401401

Spatial and temporal analysis of stem bleeding disease in coconut palm in the state of sergipe, Brazil
Provedor de dados: 42
Autores: CARVALHO,REJANE R. DA COSTA E; SOUZA,PAULO E. DE; WARWICK,DULCE R.N.; POZZA,EDSON A.; CARVALHO FILHO,JOSé L.S. DE.
ABSTRACTStem bleeding disease (resinosis) of coconut palm is caused by Thielaviopsis paradoxa and is very important in the state of Sergipe, Brazil. Understanding the epidemiological behavior of the disease is essential for establishing more efficient control strategies. Thus, we characterized the temporal progression and spatial distribution of stem bleeding in a commercial orchard under conditions of natural infection in the area of Neopolis, Sergipe. Three plots with 729 plants each were selected and evaluated every two months for stem bleeding incidence. In the temporal analysis, the monomolecular model gave the best fit to data on disease incidence, as it accurately showed the temporal dynamics of the disease during the experiment period. The spatial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coconut; Epidemiology; Stem bleeding; Thielaviopsis paradoxa.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401567

Effect of thermal treatments on technological properties of wood from two Eucalyptus species
Provedor de dados: 42
Autores: Cademartori,Pedro Henrique G. de; Missio,André L.; Mattos,Bruno D.; Gatto,Darci A.
The effect of thermal treatments on physical and mechanical properties of rose gum and Sydney blue gum wood was evaluated. Wood samples were thermally modified in a combination: pre-treatment in an autoclave (127°C - 1h) and treatment in an oven (180-240°C - 4h); and only treatment in an oven at 180-240°C for 4h. Chemical changes in the structure of woods were evaluated through infrared spectroscopy. Evaluation of physical properties was performed through mass loss, specific gravity, equilibrium moisture content and dimensional stability tests. Surface changes were analyzed through apparent contact angle technique and static bending tests were carried out to evaluate the mechanical behavior. Use of pre-treatment in autoclave affected the properties...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hygroscopicity; Chemical changes; Wettability; Heat treatment; Mechanical strength.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100471

An anthropological analysis about primatology – Reports of a particular human-animal relationship with Capuchin monkeys
Provedor de dados: 42
Autores: RAPCHAN,ELIANE S.; NEVES,WALTER A.
Abstract: This ethnography is about a particular human-animal relationship based on primatological research on groups of wild robust capuchin monkeys living in Parque Estadual Carlos Botelho (Brazil), one of the largest preserved areas of Atlantic Tropical Forest in the world. It emphasizes the complex situations that highlight the difficulty of making this research. This space integrates administrative, scientific and local interests, producing a unique cartography. We reflect on the scientific research considering the relations among primatologist, field assistant and other animals and comparing it with the hunt. “Hunt” is a model inspired in techniques and in some aspects of recreational hunt to expand the comprehension of a complex routine defined to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Tropical Forest; Ethnography; Ethnography of Science; Human-animal relations; Hunt.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000701001

Marine zooplankton studies in Brazil: a brief evaluation and perspectives
Provedor de dados: 42
Autores: Lopes,Rubens M.
Marine zooplankton research in Brazil has been primarily descriptive, with most studies focusing on community structure analysis and related issues. The composition and spatial distribution of several taxonomic groups are currently well known, although less-abundant and small-sized taxa as well as initial stages of almost all species have received little attention. Some numerically important taxa such as heterotrophic protists, ctenophores, acoel turbellarians and ostracods remain virtually unstudied. Large sectors of the continental shelf have not been sampled in detail, particularly those areas influenced by the North Brazil Current (5ºN-15ºS). Zooplankton abundance and biomass in offshore waters have seldom been quantified, and information on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine zooplankton; Ecology; Taxonomy; Southwest Atlantic.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300002

The Barreiras Group in the Northeastern coast of the State of Bahia, Brazil: depositional mechanisms and processes
Provedor de dados: 42
Autores: VILAS BÔAS,GERALDO S.; SAMPAIO,FLÁVIO J.; PEREIRA,ANTONIO M. S.
The Barreiras Group is a Miocene to Lower Pleistocene continental terrigenous sedimentary deposit exhibiting a large occurrence along the Brazilian coast. In the Conde region, located in the northeastern part of the State of Bahia, the sedimentological characteristics of these sediments are indicative of a deposition as gravelly and sandy bed load in braided fluvial systems, related to alluvial fans, under an arid to semi-arid climate. The basal portion of the group is dominated by a gravelly-sandy lithofacies deposited by debris flows and pseudoplastic debris flows, with lesser occurrences of subaqueous deposits, characterizing a proximal fluvial system deposition. The upper portion is made up of gravelly-sandy sediments that include subaqueous, debris...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barreiras Group; Tertiary; Cenozoic; State of Bahia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300010

Morphophysiology, Phenotypic and Molecular Diversity of Auxin-induced Passiflora mucronata Lam. (Passifloraceae)
Provedor de dados: 42
Autores: FRANÇA,JULIANY M.; VENIAL,LUCIMARA R.; COSTA,ELOÁ B.; SCHMILDT,EDILSON R.; SCHMILDT,OMAR; BERNARDES,PAULA M.; TATAGIBA,SANDRO D.; LOPES,JOSÉ C.; FERREIRA,MARCIA F.S.; ALEXANDRE,RODRIGO S.
ABSTRACT Genetic diversity allows identification of potential intraspecific genotypes in the genus Passiflora. The objective of this study was to examine the morphological and genetic diversity of auxin-induced Passiflora mucronata. The experiments were arranged in a complete randomized block design, with a 9 x 2 factorial arrangement (nine genotypes x presence and absence of auxin, indole-3-butyric acid (IBA)), with four replicates of 16 cuttings. The rooting and vegetative growth responses were variable. Genotype 5 was more responsive in the absence of IBA and genotypes 3, 8 and 9 were more responsive in the presence of IBA. Auxin increased rooting rate and percentage, reducing the average time of root protrusion in eight days. IBA also contributed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Indol-3-butyric acid; Rooting; Genotypes; Restinga passion fruit; Molecular markers ISSR; Propagation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401799

Fundamental tone estimates for elliptic operators in divergence form and geometric applications
Provedor de dados: 42
Autores: Bessa,Gregório P.; Jorge,Luquésio P.; Lima,Barnabé P.; Montenegro,José F.
We establish a method for giving lower bounds for the fundamental tone of elliptic operators in divergence form in terms of the divergence of vector fields. We then apply this method to the Lr operator associated to immersed hypersurfaces with locally bounded (r + 1)-th mean curvature Hr + 1 of the space forms Nn+ 1(c) of constant sectional curvature c. As a corollary we give lower bounds for the extrinsic radius of closed hypersurfaces of Nn+ 1(c) with Hr + 1 &gt; 0 in terms of the r-th and (r + 1)-th mean curvatures. Finally we observe that bounds for the Laplace eigenvalues essentially bound the eigenvalues of a self-adjoint elliptic differential operator in divergence form. This allows us to show that Cheeger's constant gives a lower bounds for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fundamental tone; Lr operator; R-th mean curvature; Extrinsic radius; Cheeger's constant.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300001

The effects of the subconjunctival injection of bevacizumab (Avastin®) on angiogenesis in the rat cornea
Provedor de dados: 42
Autores: Barros,Luiz F.M.; Belfort-Jr,Rubens.
The purpose of this study was to evaluate the effects of the use of the subconjunctival injection of bevacizumab (Avastin®) on angiogenesis in the rat cornea. Corneas of 20 Wistar male rats were cauterized with silver nitrate crystal. Animals were divided in four groups: control group (GC) that received subconjunctivally 0.02 ml of 0.9% saline solution on the day of the lesion; group GO that received subconjunctivally 0.02 ml of bevacizumab just after the lesion; group G3 that received bevacizumab on day 3 and group G5 that received bevacizumab on day 5 after lesion. Animals were euthanized on day 7. The newly formed vessels were quantified after China Ink perfusion and photographs were obtained and analyzed in a computerized system (Image Pro-Plus®). In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bevacizumab; Cornea; Neovascularization; Angiogenesis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300004

Comparative studies of two dimensional and three dimensional ultrasonic nuchal translucency in trisomy assessments
Provedor de dados: 42
Autores: Wee,Lai K.; Chai,Hum Y.; Samsury,Sharul R. Bin; Mujamil,Naizaithull F. Binti; Supriyanto,Eko.
Current two-dimensional (2D) ultrasonic marker measurements are inherent with intra- and inter-observer variability limitations. The objective of this paper is to investigate the performance of conventional 2D ultrasonic marker measurements and proposed programmable interactive three-dimensional (3D) marker evaluation. This is essentially important to analyze that the measurement on 3D volumetric measurement possesses higher impact and reproducibility vis-à-vis 2D measurement. Twenty three cases of prenatal ultrasound examination were obtained from collaborating hospital after Ethical Committee's approval. The measured 2D ultrasonic marker is Nuchal Translucency or commonly abbreviated as NT. Descriptive analysis of both 2D and 3D ultrasound measurement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Three dimensional (3D); Ultrasound; Nuchal translucency (NT); Fold thickness; Trisomy; Down Syndrome.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400030

Evaluation of anaerobic threshold in non-pregnant and pregnant rats
Provedor de dados: 42
Autores: NETTO,ALINE OLIVEIRA; MACEDO,NATHÁLIA C.D.; GALLEGO,FRANCIANE Q.; SINZATO,YURI K.; VOLPATO,GUSTAVO T.; DAMASCENO,DÉBORA C.
ABSTRACT Several studies present different methodologies and results about intensity exercise, and many of them are performed in male rats. However, the impact of different type, intensity, frequency and duration of exercise on female rats needs more investigation. From the analysis of blood lactate concentration during lactate minimum test (LacMin) in the swimming exercise, the anaerobic threshold (AT) was identified, which parameter is defined as the transition point between aerobic and anaerobic metabolism. LacMin test is considered a good indicator of aerobic conditioning and has been used in prescription of training in different exercise modalities. However, there is no evidence of LacMin test in female rats. The objective was to determine AT in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise; Swimming; Anaerobic threshold; Lactate; Pregnancy; Rats.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602749

Modulatory effects of rutin on biochemical and hematological parameters in hypercholesterolemic Golden Syrian hamsters
Provedor de dados: 42
Autores: Kanashiro,Alexandre; Andrade,Daiani C.O.; Kabeya,Luciana M.; Turato,Walter M.; Faccioli,Lucia H.; Uyemura,Sérgio A.; Lucisano-Valim,Yara M.
Flavonoids have been reported to exhibit several pharmacological properties, mainly in cardiovascular and inflammatory diseases. In the present study, we observed that rutin, a known glycosylated flavonoid isolated from Dimorphandra mollis, had a lowering effect on plasma triglyceride levels of diet-induced hypercholesterolemic Golden Syrian hamsters, but did not change total cholesterol and high-density lipoprotein cholesterol levels. Moreover, high-fat or rutin supplemented diets showed no immunotoxic effects, since no significant changes were observed on total white blood cells, granulocytes and mononuclear cells, as well as on the neutrophil apoptosis degree, when compared to untreated animals. Therefore, rutin seems to be a selective and non-toxic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rutin; Golden Syrian hamster; Hypercholesterolemia; Atherosclerosis; Apoptosis; Dimorphandra mollis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100009

Comparative palynological analysis of Lygodium venustum Sw. and L. volubile Sw. (Lygodiaceae)
Provedor de dados: 42
Autores: GIACOSA,JUAN P. RAMOS; MORBELLI,MARTA A.; GIUDICE,GABRIELA E.
The genus Lygodium Sw. is one of the few climbing ferns in the world. The spores of L. venustum Sw. and L. volubile Sw. were studied using light, scanning, and transmission electron microscopy. This work is based on herbarium material. The spores are trilete, triangular, with straight to convex sides in polar view. The equatorial diameter is 72-104 µm, and the polar diameter is 64-84 µm. The ornamentation in L. venustum is verrucate-tuberculate while in L. volubile, it is verrucate-tuberculate in the proximal face but with a few ridges on the distal face, where a micro-ornamentation constituted by verrrucae and tubercles is observed. An equatorial ridge is also present. The exospore is two-layered; in L. venustum, it is smooth in contrast with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lygodiaceae; Lygodium; Morphology; Spores; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200699

Evaluation of antioxidant activity of grapevine leaves extracts (Vitis labrusca) in liver of Wistar rats
Provedor de dados: 42
Autores: SCHAFFER,THAYS K.; WOHLENBERG,MARIANE F.; MEDEIROS,NIARA; MARTINS,JÉSSICA B.; AGOSTINI,FABIANA; FUNCHAL,CLÁUDIA; DANI,CAROLINE.
The aim of this study was to evaluate the hepatoprotection of organic and conventional grapevine leaves extract (Vitis labrusca). The total polyphenol content and the isolate polyphenols by HPLC were evaluate. The animals received intraperitoneal injections of saline or extracts (conventional or organic - 30 mg/kg) for 14 days. On day 15, the rats received carbon tetrachloride (CCl4) or mineral oil (i.p.). After 4h, the animals were euthanized. The analysis of the liver enzymes activity (AST, ALT, GGT) was performed using serum, obtained by blood and the levels of lipid peroxidation (TBARS), protein oxidation (carbonyl), and the activity of antioxidant enzymes superoxide dismutase and catalase were analyzed in the liver. The results showed that the organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxidative stress; Carbon tetrachloride; Hepatoprotection; Grapes; Phenolic compounds.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100187

Restinga forests of the Brazilian coast: richness and abundance of tree species on different soils
Provedor de dados: 42
Autores: Magnago,Luiz F.S.; Martins,Sebastião V.; Schaefer,Carlos E.G.R.; Neri,Andreza V.
The aim of this study was to determine changes in composition, abundance and richness of species along a forest gradient with varying soils and flood regimes. The forests are located on the left bank of the lower Jucu River, in Jacarenema Natural Municipal Park, Espírito Santo. A survey of shrub/tree species was done in 80 plots, 5x25 m, equally distributed among the forests studied. We included in the sampling all individuals with &gt;3.2 cm diameter at breast height (1.30 m). Soil samples were collected from the surface layer (0-10 cm) in each plot for chemical and physical analysis. The results indicate that a significant pedological gradient occurs, which is influenced by varying seasonal groundwater levels. Restinga forest formations showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetation; Flooded Forests; Coastal ecosystem; Sandy Soils; Quaternary deposits; Marine influence; Riparian forests.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300023

The role of phytophysiognomies and seasonality on the structure of ground-dwelling anuran (Amphibia) in the Pampa biome, southern Brazil
Provedor de dados: 42
Autores: MARAGNO,FRANCIÉLE P.; SANTOS,TIAGO G.; CECHIN,SONIA Z.
ABSTRACTConsidering that habitat use by amphibians is related both with climate and environmental features, we tested the hypothesis that anuran assemblages found in different phytophysiognomies and in different seasons vary in structure. Additionally, we searched for species which can be indicators of habitat and seasons. The study was conducted in the Pampa biome, southern Brazil. Sampling was done through pitfall traps placed in three phytophysiognomies: grassland, ecotone grassland/forest; and forest. The seasonality factor was created by grouping months in warn and cold seasons. Sixteen species were found and the assemblages were influenced both by phytophysiognomies and climatic seasonality. In a paired comparison, the three phytophysiognomies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibian; Community; Ecotone; Pitfalls traps; Seasons.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301105

The seed coat of Phaseolus vulgaris interferes with the development of the cowpea weevil [Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)]
Provedor de dados: 42
Autores: Silva,Luciana B.; Sales,Maurício P.; Oliveira,Antônia E. A.; Machado,Olga L. T.; Fernandes,Kátia V. S.; Xavier-Filho,José.
We have confirmed here that the seeds of the common bean (Phaseolus vulgaris, L.) do not support development of the bruchid Callosobruchus maculatus (F.), a pest of cowpea [Vigna unguiculata (L.) Walp] seeds. Analysis of the testa (seed coat) of the bean suggested that neither thickness nor the levels of compounds such as tannic acid, tannins, or HCN are important for the resistance. On the other hand, we have found that phaseolin (vicilin-like 7S storage globulin), detected in the testa by Western blotting and N-terminal amino acid sequencing, is detrimental to the development of C. maculatus. As for the case of other previously studied legume seeds (Canavalia ensiformis and Phaseolus lunatus) we suggest that the presence of vicilin-like proteins in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Phaseolin (vicilin); Testa; Resistance; Cowpea weevil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100006

Critical review of radiopharmaceutical-drug interactions, unexpected new age for a Tupiguarani settlement, and the h-index in the Brazilian Academy of Sciences
Provedor de dados: 42
Autores: Kellner,Alexander W.A.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400001

Performance and egg quality of laying hens fed with mineral sources and rosemary oil
Provedor de dados: 42
Autores: GARCIA,ELIS REGINA DE M.; CHAVES,NATÁLIA R.B.; OLIVEIRA,CARLOS ANTONIO L. DE; KIEFER,CHARLES; MELO,EVILÁSIO P. DE.
Abstract In order to evaluate the effect of rosemary oil and micro mineral sources on the performance and egg quality of laying hens, 288 hens were used and distributed in a completely randomized design using a 2x3 factorial (mineral sources x rosemary oil) with six different diets and six replications. Diets were formulated containing inorganic or organic minerals, with or without added rosemary oil (100 and 200 mg kg-1). The treatments showed interaction for average egg weight, yolk color, albumen and yolk percentage, with significant results from the use of organic minerals compared to inorganic minerals. The addition of 200 mg kg-1 rosemary oil in diets improved laying rate, egg mass, specific gravity, number of pores on the shell when compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chelated mineral; Feed intake; Haugh unit; Rosmarinus officinalis; Shell thickness.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300851

Preparation and characterization of alginate and gelatin microcapsules containing Lactobacillus rhamnosus
Provedor de dados: 42
Autores: LOPES,SUSIANY; BUENO,LUCIANO; AGUIAR JÚNIOR,FRANCISCO DE; FINKLER,CHRISTINE.
ABSTRACT This paper describes the preparation and characterization of alginate beads coated with gelatin and containing Lactobacillus rhamnosus. Capsules were obtained by extrusion method using CaCl2 as cross linker. An experimental design was performed using alginate and gelatin concentrations as the variables investigated, while the response variable was the concentration of viable cells. Beads were characterized in terms of size, morphology, scanning electron microscopy (SEM), moisture content, Fourier Transform Infrared Spectrometry (FTIR), thermal behavior and cell viability during storage. The results showed that the highest concentration of viable cells (4.2 x 109 CFU/g) was obtained for 1 % w/v of alginate and 0.1 % w/v of gelatin. Capsules were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Probiotics; Biopolymers; Functional foods; Microencapsulation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401601

Exploring the metallochromic behavior of pentacyanidoferrates in visual, electronic and Raman spot tests
Provedor de dados: 42
Autores: SHINOHARA,JORGE S.; GRASSESCHI,DANIEL; ALMEIDA,SABRINA N.; TOMA,HENRIQUE E.
Abstract: Pentacyanidoferrate(II) complexes of aromatic N-heterocycles, such as 4-cyanopyridine, exhibit characteristic colors and strong metallochromism associated with the donor-acceptor interactions of the metal ions with the cyanide ligands. In the presence of transition metal ions insoluble polymeric complexes are formed, displaying bright yellow, red, brown and green colors with zinc(II), nickel(II), copper(II) and iron(III) ions, respectively. Such metallochromic response is better observed on filter paper, allowing applications in analytical spot tests. The effects can be explored visually and probed by means of modern instrumental facilities, including spectrophotometric and resonance Raman techniques. In this way, by using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pentacyanidoferrates; Feigl spot tests; Prussian blue; Resonance Raman; Ring oven.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300401

The influence of environmental variables in the reproductive performance of Macrobrachium amazonicum (Heller, 1862) (Caridea: Palaemonidae) females in a continental population
Provedor de dados: 42
Autores: PANTALEÃO,JOÃO ALBERTO F.; CARVALHO-BATISTA,ABNER; TEODORO,SARAH S.A.; COSTA,ROGÉRIO C.
ABSTRACT Macrobrachium amazonicum is a commercially important freshwater prawn with a high degree of reproductive plasticity. The species is classified into two groups: coastal populations, with larger individuals exhibiting high fecundity and needing brackish water for larval development; and continental populations, with smaller specimens exhibiting low fecundities and completing metamorphosis in freshwater. The objective of this study was to investigate the influence of environmental factors in the fecundity, egg size and volume, and reproductive output in females of M. amazonicum from a continental population during a two-year period. We also compared our results with those obtained for other continental and coastal populations. Reproductive parameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon river prawn; Shrimp; Tietê; Abiotic factors; Reproductive output.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401445

Subcortical connections of area V4 in the macaque
Provedor de dados: 42
Autores: GATTASS,RICARDO; DISTLER,CLAUDIA; DESIMONE,ROBERT; UNGERLEIDER,LESLIE G.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300035

The evolution of Neoproterozoic magmatism in Southernmost Brazil: shoshonitic, high-K tholeiitic and silica-saturated, sodic alkaline volcanism in post-collisional basins
Provedor de dados: 42
Autores: Sommer,Carlos A.; Lima,Evandro F.; Nardi,Lauro V. S.; Liz,Joaquim D.; Waichel,Breno L.
The Neoproterozoic shoshonitic and mildly alkaline bimodal volcanism of Southernmost Brazil is represented by rock assemblages associated to sedimentary successions, deposited in strike-slip basins formed at the post-collisional stages of the Brasilian/Pan-African orogenic cycle. The best-preserved volcano sedimentary associations occur in the Camaquã and Campo Alegre Basins, respectively in the Sul-riograndense and Catarinense Shields and are outside the main shear belts or overlying the unaffected basement areas. These basins are characterized by alternation of volcanic cycles and siliciclastic sedimentation developed dominantly on a continental setting under subaerial conditions. This volcanism and the coeval plutonism evolved from high-K tholeiitic and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Post-collisional; Neoproterozoic; Volcanism; Shoshonite; Na-alkaline.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300015

Hematological and biometric traits of tuvira Gymnotus inaequilabiatus (Valenciennes, 1839) (Gymnotiformes: Gymnotidae) from the Brazilian Pantanal
Provedor de dados: 42
Autores: RODRIGUES,ROBSON A.; SILVA,EDUARDA S.; MARCONDES,SANDRIELY F.; GALINDO,GIZELA M.; OLIVEIRA,GUSTAVO G. DE; SOUZA,ALDA I. DE; RAGUSA-NETTO,JOSÉ; FERNANDES,CARLOS E.
ABSTRACT This study describes the hematological and biometric characteristics of male and female Gymnotus species from the Pantanal, Mato Grosso do Sul state, Brazil. Fifty adult specimens of Gymnotus inaequilabiatus were weighed, measured, and then euthanized. Blood was collected by puncturing the celiac mesenteric vein to determine the hematocrit, hemoglobin content, number of erythrocytes, mean corpuscular volume, mean corpuscular hemoglobin concentration, glucose level, absolute value of leukocytes, and relative value of leukocytes and thrombocytes. Body weight and relative condition factor did not differ (P &gt; 0.05) between the sexes, as well as erythrogram and the blood glucose values. Hematocrit ranged from 18.0% to 54.0%; hemoglobin from 1.1 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blood glucose; Erythrogram; Leukocytes; Sex differences; Thrombocytes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100049

Exogenous enzyme complex prevents intestinal soybean meal-induced enteritis in Mugil liza (Valenciennes, 1836) juvenile.
Provedor de dados: 42
Autores: RAMOS,LEONARDO R.V.; PEDROSA,VIRGÍNIA F.; MORI,AGNES; ANDRADE,CARLOS F.F. DE; ROMANO,LUIS A.; ABREU,PAULO C.; TESSER,MARCELO B.
ABSTRACT Four soybean meal-based diets containing increasing levels of an enzyme complex (E50, E100, E150 and E200 at 50, 100, 150 and 200 g ton-1, respectively) and one soybean meal-based diet without the enzyme complex (E0) were fed in triplicate to M. liza juveniles in a semi-static flow system with 20 fish per tank for 75 days. There were no differences between the treatments for animal performance parameters, but fish fed the enzyme complex treatment exhibited significantly (P&lt;0.05) higher values of calcium bone retention compared with control fish. Although there was no relationship between bacterial counts in different sections of the gastrointestinal tract or enzyme levels, filamentous bacteria were increased in E50 compared with E150. All of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrase; Growth; Histology; Microorganisms; Mullet; Phytase.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100341

Dialogues between social and natural sciences: contribution to the debate on socio-environmental conflicts
Provedor de dados: 42
Autores: Milanez,Bruno.
ABSTRACT In this article, I argue that attempting to solve real problems is a possible approach to bring social and natural sciences together, and suggest that - as Environmental Impact Assessment necessarily brings together social and environmental issues - this debate is a strong candidate for such a task. The argument is based on a general discussion about the possibilities and limitations of Environmental Impact Assessments, the social-environmental impacts of mining activities and three case studies. The analysis of the cases indicates possibilities and limitations of the dialogue between scientists from various areas - and of the collaboration with social movements and affected communities - in avoiding negative impacts of mining projects and,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interdisciplinary; Sustainability; Social-environmental conflicts; Mining.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502335

(4S)-4,8-dihydroxy-1-tetralone and other chemical constituents from Pestalotiopsis sp. EJC07, endophytic fromBauhinia guianensis
Provedor de dados: 42
Autores: Souza,Eleane M.C. de; Silva,Ellon L. Da; Marinho,Andrey M.R.; Marinho,Patrícia S.B.
The present work reports the isolation of eight compounds fromPestalotiopsis sp. EJC07 isolated as endophytic fromBauhinia guianensis, a tipical plant of the Amazon. The compounds (4S)-4,8-dihydroxy-1-tetralone (1), uracil (2), uridin (3), p-hydroxybenzoic acid (4), ergosterol (5), ergosterol peroxide (6), cerevisterol (7) and ducitol (8) were isolated by chromatographic procedures and identified by spectral methods of 1D and 2D NMR and MS. The compound 1 is being reported for the first time in the genusPestalotiopsis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: B. guianensis; Endophityc fungus; Pestalotiopsis; Tetralone.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100029

The coming of age of cosmophysics
Provedor de dados: 42
Autores: Jacob,Maurice.
''Cosmophysics'' as reviewed is a multidisciplinary domain which brings together astroparticle physics, fundamental physics in space and topics related to the structure and evolution of the Universe. It represents a growing interface between high-energy particle physics and astro-physics. This paper presents a general overview of the subject, focusing on cosmology, cosmic rays, dark matter searches and the soon-expected observation of gravitational waves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astrophysics; Cosmology; Gravitational wave; Space research; Universe/structure; Universe/evolution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200002

Mimics of copper proteins: structural and functional aspects
Provedor de dados: 42
Autores: FERREIRA,ANA MARIA DA COSTA; SANTOS,MARIA LÚCIA PIRES DOS; PEREIRA,ELEONICE MARIA; DAMASCENO,MARCOS OLIVEIRA; ALVES,WENDEL ANDRADE.
The importance of copper as an essential element can be estimated by the wide range of copper proteins and enzymes playing different roles in biological systems. In the last decades many bioinorganic studies were developed on mimetic complexes of copper-dependent proteins, in order to verify the interrelations between structural and functional properties of active copper centers. Among the most studied copper ion ligand, diimine compounds have deserved special attention due their flexibility, facility of preparation, and ability to stabilize both oxidation states of this metal. In our laboratory, we have been investigating some Schiff base copper complexes as mimics of different proteins, with emphasis on functional aspects, trying to elucidate mechanisms...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper protein mimics; Copper diimine complexes; EPR measurements; Characterization and reactivity studies.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000100007

Use of synthetic aperture radar for recognition of Coastal Geomorphological Features, land-use assessment and shoreline changes in Bragança coast, Pará, Northern Brazil
Provedor de dados: 42
Autores: Souza-Filho,Pedro W. M.; Paradella,Waldir R.
Synthetic Aperture Radar (SAR) images are being used more extensively than ever before for geoscience applications in the moist tropics. In this investigation, a RADARSAT1-1 C-HH SAR image acquired in 1998 was used for coastal mapping and land-cover assessment in the Bragança area, in the northern Brazil. The airborne GEMS 1000 X-HH radar image acquired in 1972 during the RADAM Project was also used for evaluating coastal changes occurring over the last three decades. The research has confirmed the usefulness of RADARSAT-1 image for geomorphological mapping and land-cover assessment, particularly in macrotidal mangrove coasts. It was possible to map mangroves, salt marshes, chenier sand ridges, dunes, barrier-beach ridges, shallow water morphologies and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geomorphology; Coastal changes; Remote sensing; Mangrove; Amazon.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300007

White sand vegetation in an Amazonian lowland under the perspective of a young geological history
Provedor de dados: 42
Autores: ROSSETTI,DILCE F.; MOULATLET,GABRIEL M.; TUOMISTO,HANNA; GRIBEL,ROGÉRIO; TOLEDO,PETER M.; VALERIANO,MÁRCIO M.; RUOKOLAINEN,KALLE; COHEN,MARCELO C.L.; CORDEIRO,CARLOS L.O.; RENNÓ,CAMILO D.; COELHO,LUIZ S.; FERREIRA,CARLOS A.C.
Abstract: What controls the formation of patchy substrates of white sand vegetation in the Amazonian lowlands is still unclear. This research integrated the geological history and plant inventories of a white sand vegetation patch confined to one large fan-shaped sandy substrate of northern Amazonia, which is related to a megafan environment. We examined floristic patterns to determine whether abundant species are more often generalists than the rarer one, by comparing the megafan environments and older basement rocks. We also investigated the pattern of species accumulation as a function of increasing sampling effort. All plant groups recorded a high proportion of generalist species on the megafan sediments compared to older basement rocks. The vegetation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian wetlands; Geological history; Late Pleistocene-Holocene; Megafan sedimentary dynamics; White sand vegetation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700503

Green method by diffuse reflectance infrared spectroscopy and spectral region selection for the quantification of sulphamethoxazole and trimethoprim in pharmaceutical formulations
Provedor de dados: 42
Autores: Silva,Fabiana E.B. da; Flores,Érico M.M.; Parisotto,Graciele; Müller,Edson I.; Ferrão,Marco F.
An alternative method for the quantification of sulphametoxazole (SMZ) and trimethoprim (TMP) using diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and partial least square regression (PLS) was developed. Interval Partial Least Square (iPLS) and Synergy Partial Least Square (siPLS) were applied to select a spectral range that provided the lowest prediction error in comparison to the full-spectrum model. Fifteen commercial tablet formulations and forty-nine synthetic samples were used. The ranges of concentration considered were 400 to 900 mg g-1SMZ and 80 to 240 mg g-1 TMP. Spectral data were recorded between 600 and 4000 cm-1 with a 4 cm-1 resolution by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The proposed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemometrics; Diffuse reflectance infrared Fourier transform spectroscopy; Green analytical method; High performance liquid chromatography; Interval partial least squares (iPLS); Synergy partial least squares (siPLS).
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100001

Contributions to a Brazilian Code of Conduct for Fieldwork in Geology: an approach based on Geoconservation and Geoethics
Provedor de dados: 42
Autores: MANSUR,KÁTIA L.; PONCIANO,LUIZA C.M.O.; CASTRO,ALINE R.S.F. DE.
ABSTRACT When considering the numerous events that have prohibited the development of scientific projects or caused destruction of outcrops, it is clear that there is rapidly increasing necessity to define a Brazilian Code of Conduct for geological fieldwork. In general, this destruction is attributed to lack of knowledge as to the relevance of geological sites. The aim of this Code of Conduct is to guide geologists to adopt good practices during geoscience activities. Proposed guidelines are based on Codes of Conduct from other countries, mainly Scotland and England, on situations described in papers and on the personal experience of the authors. In this paper 29 points are suggested, in order to guarantee that fieldwork is conducted in accordance with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geoethics; Geoconservation; Code of conduct; Sustainability principles; Geoheritage; Fieldwork.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200431

Late paleozoic glacial sedimentation in Northeastern Brazil: new results
Provedor de dados: 42
Autores: Viviani,Juliana B.; Rocha-Campos,Antonio C.; Ernesto,Marcia.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400012

Pollination of Rapeseed (Brassica napus) by Africanized Honeybees (Hymenoptera: Apidae) on Two Sowing Dates
Provedor de dados: 42
Autores: CHAMBÓ,EMERSON D.; OLIVEIRA,NEWTON T.E. DE; GARCIA,REGINA C.; DUARTE-JÚNIOR,JOSÉ B.; RUVOLO-TAKASUSUKI,MARIA CLAUDIA C.; TOLEDO,VAGNER A.
In this study, performed in the western part of the state of Paraná, Brazil, two self-fertile hybrid commercial rapeseed genotypes were evaluated for yield components and physiological quality using three pollination tests and spanning two sowing dates. The treatments consisted of combinations of two rapeseed genotypes (Hyola 61 and Hyola 433), three pollination tests (uncovered area, covered area without insects and covered area containing a single colony of Africanized Apis melliferahoneybees) and two sowing dates (May 25th, 2011 and June 25th, 2011). The presence of Africanized honeybees during flowering time increased the productivity of the rapeseed. Losses in the productivity of the hybrids caused by weather conditions unfavorable for rapeseed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Brassicaceae; Climatic conditions; Pollinators.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402087

Numbers for reducible cubic scrolls
Provedor de dados: 42
Autores: Vainsencher,Israel; Xavier,Fernando.
We show how to compute the number of reducible cubic scrolls of codimension 2 in (math blackboard symbol P)n incident to the appropriate number of linear spaces.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cubic scrolls; Enumerative geometry.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400003

The last dinosaurs of Brazil: The Bauru Group and its implications for the end-Cretaceous mass extinction
Provedor de dados: 42
Autores: BRUSATTE,STEPHEN L.; CANDEIRO,CARLOS R.A.; SIMBRAS,FELIPE M.
ABSTRACT The non-avian dinosaurs died out at the end of the Cretaceous, ~66 million years ago, after an asteroid impact. The prevailing hypothesis is that the effects of the impact suddenly killed the dinosaurs, but the poor fossil record of latest Cretaceous (Campanian-Maastrichtian) dinosaurs from outside Laurasia (and even more particularly, North America) makes it difficult to test specific extinction scenarios. Over the past few decades, a wealth of new discoveries from the Bauru Group of Brazil has revealed a unique window into the evolution of terminal Cretaceous dinosaurs from the southern continents. We review this record and demonstrate that there was a diversity of dinosaurs, of varying body sizes, diets, and ecological roles, that survived to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Cretaceous; Dinosaur; Gondwana; K-Pg boundary; Mass extinction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401465

Dinosaur osteoderms from the Adamantina Formation, upper Cretaceous of São Paulo State, Brazil
Provedor de dados: 42
Autores: TORRES,SANDRA R.; AVILLA,LEONARDO S.; ABRANTES,ÉRIKA A.L.; BERGQVIST,LÍLIAN P.
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200021

Chemical composition and natural durability of juvenile and mature heartwood of Robinia pseudoacacia L.
Provedor de dados: 42
Autores: Latorraca,João V.F; Dünisch,Oliver; Koch,Gerald.
The aim of this study was to characterize the properties of juvenile and mature heartwood of Robinia pseudoacacia L. (black locust). The content, the composition, and subcellular localization of heartwood extractives were studied in 14 old-grown trees from forest sites in Germany and Hungary, as well as in 16 younger trees of four clone types. Heartwood extractives (methanol and acetone extraction) were analysed by HPLC-chromatography. UV microspectrophotometry was used to localize the extractives in the wood cell walls. The natural durability of juvenile and mature heartwood was analysed according to the European standard EN 350-1. Growth analyses, as well as the chemical analyses, showed that in Robinia the formation of juvenile wood is restricted to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Juvenile Wood; Natural durability; Wood chemical.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300024

Treatment of fear memories: interactions between extinction and reconsolidation
Provedor de dados: 42
Autores: Fiorenza,Natália G.; Sartor,Dagieli; Myskiw,Jociane C.; Izquierdo,Iván.
Retrieval labilizes memory traces and these gates two protein synthesis-dependent processes in the brain: extinction, which inhibits further retrieval, and reconsolidation, which may enhance retrieval or change its content. Extinction may itself suffer reconsolidation. Interactions among these processes may be applied to treatments of fear memories, such as those underlying post-traumatic stress disorders.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extinction learning; Fear memories; Memory; Post-traumatic stress disorder; Reconsolidation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400023

DNA damage in children and adolescents with cardiovascular disease risk factors
Provedor de dados: 42
Autores: Kliemann,Mariele; Prá,Daniel; Müller,Luiza L.; Hermes,Liziane; Horta,Jorge A.; Reckziegel,Miriam B.; Burgos,Miria S.; Maluf,Sharbel W.; Franke,Silvia I.R.; Silva,Juliana da.
The risk of developing cardiovascular disease (CVD) is related to lifestyle (e.g. diet, physical activity and smoking) as well as to genetic factors. This study aimed at evaluating the association between CVD risk factors and DNA damage levels in children and adolescents. Anthropometry, diet and serum CVD risk factors were evaluated by standard procedures. DNA damage levels were accessed by the comet assay (Single cell gel electrophoresis; SCGE) and cytokinesis-blocked micronucleus (CBMN) assays in leukocytes. A total of 34 children and adolescents selected from a population sample were divided into three groups according to their level of CVD risk. Moderate and high CVD risk subjects showed significantly higher body fat and serum CVD risk markers than low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular diseases; Micronucleus test; Comet assay; Diet; Anthropometry; Child; Adolescent.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300025

Effect of tillage system on yield and weed populations of soybean ( Glycin Max L.)
Provedor de dados: 42
Autores: Hosseini,Seyed Z.; Firouzi,Saeed; Aminpanah,Hashem; Sadeghnejhad,Hamid R.
Field experiment was conducted at Agricultural and Natural Resources Research Center of Golestan Province, Iran, to determine the effects of tillage system and weed management regime on yield and weed populations in soybean ( Glycin max L.). The experimental design was a split plot where the whole plot portion was a randomized complete block with three replicates. Main plots were tillage system: 1- No-till row crop seeding, 2- No-till seed drilling, 3- Tillage with disc harrow and drill planting, 4- Tillage with chisel packer and drill planting. The subplots were weed management regimes: 1-Weed control with herbicide application, 2- Hand weeding, 3- Herbicide application plus hand weeding, and 4- Non-weeding. Results indicated that the main effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Tillage systems; Weed management regimes; Yield; Yield components.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100377

Late Quaternary drainage dynamics in northern Brazil based on the study of a large paleochannel from southwestern Marajó Island
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.
Marajó Island shows an abundance of paleochannels easily mapped in its eastern portion, where vegetation consists mostly of savannas. SRTM data make possible to recognize paleochannels also in western Marajó, even considering the dense forest cover. A well preserved paleodrainage network from the adjacency of the town of Breves (southwestern Marajó Island) was investigated in this work combining remote sensing and sedimentological studies. The palimpsest drainage system consists of a large meander connected to narrower tributaries. Sedimentological studies revealed mostly sharp-based, fining upward sands for the channelized features, and interbedded muds and sands for floodplain areas. The sedimentary structures and facies successions are in perfect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Sedimentology; Paleochannel; Marajó Island; Quaternary.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300017

Saturniidae and Sphingidae (Lepidoptera, Bombycoidea) assemblage in Vossoroca, Tijucas do Sul, Paraná, Brazil
Provedor de dados: 42
Autores: SANTOS,FÁBIO L.; CASAGRANDE,MIRNA M.; MIELKE,OLAF H.H.
The richness and abundance of the assemblage of species in a community are a way to understand the patterns of diversity found around the world. This study describes the assemblages of Saturniidae and Sphingidae in an area of Montana Mixed Ombrophilous Forest, Tijucas do Sul, Paraná, Brazil, 880m, 25º50'8.93"S, 49º 02'55.20"W. Samples were collected between November 2010 and September 2011 during two nights at the twelve new moons periods with a light trap equipped with black light lamp (ultraviolet) of 46 watts between two mercury mixed-light lamps HWL 250 watts from 6:00 p.m to 06:00 a.m. The sampling effort totaled 288 hours. This sampling effort was responsible for the capture of 1235 specimens, distributed in 124 species: 858 specimens and 86 species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Survey; Moths; Community.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200843

Soil-vegetation relationships and community structure in a "terra-firme"-white-sand vegetation gradient in Viruá National Park, northern Amazon, Brazil
Provedor de dados: 42
Autores: MENDONÇA,BRUNO A.F. DE; FERNANDES FILHO,ELPÍDIO I.; SCHAEFER,CARLOS E.G.R.; MENDONÇA,JÚLIA G.F. DE; VASCONCELOS,BRUNO N.F.
ABSTRACT Viruá National Park encompasses a vast and complex system of hydromorphic sandy soils covered largely by the white sand vegetation ("Campinarana") ecosystem. The purpose of this study was to investigate a vegetation gradient of "terra-firme"-white sand vegetation at the Viruá National Park. Nine plots representing three physiognomic units were installed for floristic and phytosociological surveys as well as to collect composite soil samples. The data were subjected to assessments of floristic diversity and similarity, phytosociological parameters and to statistical analyses, focused on principal components (PC) and canonical correspondence analysis (CCA). The vegetation of the Campinaranas types and Forest differed in biomass and species density....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Campinarana; Canonical correlation; Monodominant species; Phytosociology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301269

Reconstruction of paleoenvironments using carbon stable isotopes of specific compounds
Provedor de dados: 42
Autores: Santos Neto,Eugenio V.
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400028

Tonal vocalizations in a noisy environment: an approach to their semi-automatic analysis and examples of its application
Provedor de dados: 42
Autores: Mundry,Roger; Sommer,Christian.
Vocalizations with an emphasized fundamental are common in many species of animals. Such calls can presumably be sufficiently described by measures of their fundamental shape or 'contour'. Here we describe a software we developed to analyze such vocalizations semi-automatically. The software is particularly designed to cope with vocalizations recorded in a noisy environment. Some of the algorithms implemented (e.g. signal detection, contour detection, contour measurement, validation) and some preliminary applications dealing with calls of different species of birds are presented. Finally, we briefly discuss the possible significance of such vocalizations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tonal vocalizations; Contour measurement; Software.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200016

Population structure of the gomphothere Stegomastodon waringi (Mammalia: Proboscidea: Gomphotheriidae) from the Pleistocene of Brazil
Provedor de dados: 42
Autores: Mothé,Dimila; Avilla,Leonardo S.; Winck,Gisele R.
The Quaternary fossil record of Águas de Araxá (Q AA) is represented mainly by an accumulation of skeletal elements of several sizes, which are assigned to a population of Stegomastodon waringi. We analyzed 97 molars according to the ear stages of Sipson and Paula-Couto (1957), and developed a orphoetric ear index. The population structure (proportion of immature, subadult, adult, mature adult and senile adult individuals) was identified, and these five age classes were compared to those of extant elephant populations and defined with social implications. The analysis made possible to establish that the population is largely composed of adults: 14.89% are immature individuals, 23.04% subadults, 27.65% adults, 17.21% mature adults and another 17.21% senile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stegoastodon waringi; Age classes; Morphometric wear index; Populational structure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400020

On persistently positively expansive maps
Provedor de dados: 42
Autores: Arbieto,Alexander.
In this paper, we prove that any C¹-persistently positively expansive map is expanding. This improves a result due to Sakai (Sakai 2004).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Positively expansive maps; Expanding maps.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200002

Relationship between pollen morphology and chromosome numbers in Brazilian species of Lippia L. (Verbenaceae)
Provedor de dados: 42
Autores: Sousa,Saulo M.; Pierre,Patrícia M.O.; Torres,Giovana A.; Davide,Lisete C.; Viccini,Lyderson F.
The pollen morphology and exine structure of 17 species of Lippia L. were investigated in this work using light and scanning electron microscopy. Among the species studied, 14 showed tricolporate pollen grains, two had tri- and tetracolporate pollen grains and a single species exhibited, only tetracolporate pollen. The amb ranged from triangular to square, and the shape varied from oblate-spheroidal to prolate-spheroidal. Three different types of exine ornamentation were observed: psilate, scabrate and perforate. In addition to morphological data, we found positive association between the chromosome numbers and size of pollen grains, and also between the length and width of the colpi. The results indicate that the characteristics of pollen grains in Lippia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome numbers; Lippia; Palynology; Palynomorphology; Pollen; Verbenaceae.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100147

Selection of phytotoxin producing rhizobacteria
Provedor de dados: 42
Autores: Carvalho,Daniel D.C.; Oliveira,Denilson F.; Campos,Vicente P.; Pasqual,Moacir.
In order to select phytotoxin producing rhizobacteria to control weed plants, twenty five bacterial strains previously isolated from the rhizospheres of various plants were grown in a liquid medium and, after cell removal by centrifugation, the liquid phases were freeze-dried and the products were extracted with ethyl acetate/methanol. The extracts were concentrated to dryness under vacuum and dissolved in water and sucrose solution to be submitted to in vitro assays of lettuce (Lactuca sativa L.) seed germination and wheat (Triticum aestivum L.) coleoptile growth. Although most samples affected coleoptile growth, only those from four strains reduced lettuce seed germination. Two strains of Bacillus cereus, one strain of B. pumilus and one of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus; Stenotrophomonas; Weeds; Lettuce; Wheat.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300027

Sea-level fluctuations and coastal evolution in the state of Rio de Janeiro, southeastern Brazil
Provedor de dados: 42
Autores: CASTRO,JOÃO WAGNER A.; SUGUIO,KENITIRO; SEOANE,JOSÉ C.S.; CUNHA,ALINE M. DA; DIAS,FABIO F.
The present paper aims to investigate the relative sea-level and the coastal evolution during the Holocene in the Rio de Janeiro coastline, based on geological and biological indicators. Using topographic survey, excavation and coring, and 14C dating of these coastal deposits and beachrocks outcrops, we have reconstructed a sea-level curve for the Holocene. For the first time on the Brazilian coast it was identified a negative record of relative sea-level during Late Pleistocene and Early Holocene transition. After the transition, a relatively rapid increase of sea-level began. At approximately at 8500 cal yr BP, the sea-level was 0.5 m below the current level, was overtaken for the first time in the Holocene, at approximately 7500 cal yr BP. The maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sea-level fluctuations; Coastal evolution; Holocene; Brazilian coast.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200671

Chemical signature of two Permian volcanic ash deposits within a bentonite bed from Melo, Uruguay
Provedor de dados: 42
Autores: Calarge,Liane M.; Meunier,Alain; Lanson,Bruno; Formoso,Milton L.L.
A Permian bentonite deposit at Melo, Uruguay is composed of a calcite-cemented sandstone containing clay pseudomorphs of glass shards (0-0.50 m) overlying a pink massive clay deposit (0.50-2.10m). The massive bed is composed of two layers containing quartz and smectite or pure smectite respectively. The smectite is remarkably homogeneous throughout the profile: it is a complex mixed layer composed of three layer types whose expandability with ethylene glycol (2EG 1EG or 0EG sheets in the interlayer zone which correspond to low-, medium- and high-charge layers respectively) varies with the cation saturating the interlayer zone. The smectite homogeneity through the profile is the signature of an early alteration process in a lagoonal water which was over...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bentonite; REE; Incompatible elements; Mixed-layer minerals; Uruguay.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300012

Diversity patterns, research trends and mismatches of the investigative efforts to amphibian conservation in Brazil
Provedor de dados: 42
Autores: CAMPOS,FELIPE S.; BRITO,DANIEL; SOLÉ,MIRCO.
The number of papers on biology of amphibians has increased in the recent years. A detailed overview of the publications on amphibians can be very useful in assessing the status of our knowledge about this taxonomic group. Due to the large number of articles published, we aimed to assess the scientific contribution of herpetological researches carried out between the years 2001 and 2010 on Brazilian amphibians, considering the diversity patterns, the threats and the research topics that have been published most often. We applied scientometric attention indexes in the reviewed studies from seven scientific databases. To examine the relationship between the numbers of species recorded locally and regionally at different spatial scales, we used an additive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Scientometry; Attention index; Additive diversity partitioning; Temporal trend.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401873

On the monomial birational maps of the projective space
Provedor de dados: 42
Autores: Gonzalez-Sprinberg,Gérard; Pan,Ivan.
We describe the group structure of monomial Cremona transformations. It follows that every element of this group is a product of quadratic monomial transformations, and geometric descriptions in terms of fans.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monomial birational maps; Toric varieties.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200001

Evaluation of meso-substituted cationic corroles as potential antibacterial agents
Provedor de dados: 42
Autores: CARDOTE,TERESA A.F.; BARATA,JOANA F.B.; AMADOR,CAROLINA; ALVES,ELIANA; NEVES,MARIA GRAÇA P.M.S.; CAVALEIRO,JOSÉ A.S.; CUNHA,ÂNGELA; ALMEIDA,ADELAIDE; FAUSTINO,MARIA AMPARO F.
ABSTRACT Cationic derivatives of 5,10,15-tris[4-(pyridin-4-ylsulphanyl)-2,3,5,6-tetrafluorophenyl]-corrolategallium(III)pyridine and 5,10,15-tris[4-(pyridin-2-ylsulfanyl)-2,3,5,6-tetrafluorophenyl]-correlategallium(III)pyridine were synthesized and their photosensitizing properties against the naturally bioluminescent Gram-negative bacterium Allivibrio fischeri were evaluated. The cationic corrole derivatives exhibited antibacterial activity at micromolar concentrations against this Gram-negative bacterium strain.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allivibrio fischeri; Corroles; Photosensitizer; PDI; Bioluminescence.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301175

Histological modifications of the rat prostate following transection of somatic and autonomic nerves
Provedor de dados: 42
Autores: Diaz,Rosaura; Garcia,Luis I.; Locia,Jose; Silva,Milagros; Rodriguez,Sara; Perez,Cesar A.; Aranda-Abreu,Gonzalo E.; Manzo,Jorge; Toledo,Rebeca; Hernandez,Maria Elena.
It is known that hormones influence significantly the prostate tissue. However, we reported that mating induces an increase in androgen receptors, revealing a neural influence on the gland. These data suggested that somatic afferents (scrotal and genitofemoral nerves) and autonomic efferents (pelvic and hypogastric nerves) could regulate the structure of the prostate. Here we assessed the role of these nerves in maintaining the histology of the gland. Hence, afferent or efferent nerves of male rats were transected. Then, the ventral and dorsolateral regions of the prostate were processed for histology. Results showed that afferent transection affects prostate histology. The alveoli area decreased and increased in the ventral and dorsolateral prostate,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pelvic nerve; Hypogastric nerve; Genitofemoral nerve; Scrotal nerve.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200015

Prevalence and Fluconazole Susceptibility Profile of Candida spp. Clinical Isolates in a Brazilian Tertiary Hospital in Minas Gerais, Brazil
Provedor de dados: 42
Autores: Neves-Junior,Athayde; Cartágenes-Pinto,Ana Carolina; Rocha,Débora A.S.; Sá,Leandro F. Reis de; Junqueira,Maria de Lourdes; Ferreira-Pereira,Antonio.
Candidiasis has become an important concern for clinical practice, especially with the increasing incidence of immunocompromised patients. In this scenario, the development resistance to fluconazole presents a challenge for treating these opportunistic infections. The aim of this study was to evaluate some epidemiology features of Candidainfections in a Brazilian University Hospital using data, previously unavailable. We observed that 44% of the 93 clinical isolates tested, belonged to Candida albicansspecies and 56% belonged to non-Candida albicansspecies (mainly Candida tropicalis and Candida glabrata). Most strains were isolated from urine samples where C. albicans was predominantly detected. 29 strains presented a fluconazole resistance phenotype and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candidaspp.; Clinical isolates; Epidemiology; Fluconazole; Resistance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301349

Multiphysical modelling of fluid transport through osteo-articular media
Provedor de dados: 42
Autores: Lemaire,Thibault; Naili,Salah; Sansalone,Vittorio.
In this study, a multiphysical description of fluid transport through osteo-articular porous media is presented. Adapted from the model of Moyne and Murad, which is intended to describe clayey materials behaviour, this multiscale modelling allows for the derivation of the macroscopic response of the tissue from microscopical information. First the model is described. At the pore scale, electrohydrodynamics equations governing the electrolyte movement are coupled with local electrostatics (Gauss-Poisson equation), and ionic transport equations. Using a change of variables and an asymptotic expansion method, the macroscopic description is carried out. Results of this model are used to show the importance of couplings effects on the mechanotransduction of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomechanics; Multi-scale; Homogenization; Osteo-articular tissues; Coupling effects.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100011

Experimental study of the kinetics of the adsorption of nitrogen by coal containing different amounts of water
Provedor de dados: 42
Autores: XIAOMING,NI; LIU,ZEDONG; JIANPING,WEI; ZHAO,YONGCHAO.
Abstract: Useful insight can be gained into the underlying adsorption mechanism by studying the adsorption of nitrogen by primary structure coal with different water content. In this work, a coal-adsorption gas experimental system is used to investigate the adsorption of nitrogen by coal samples containing different amounts of water ( 2.894%, 1.871%, 0.897%, and 0%) and different pressures (0.7, 1.2, 1.7, 2.2, 2.7, 3.2, and 3.7MPa). The adsorption rates under the different conditions were calculated using a volume method, and the adsorption kinetics investigated using a kinetic model. The results show that an adsorption model based on an opposing process characterizes the adsorption behavior better than the pseudo-first order kinetic model and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption kinetics; Adsorption rate constant; Primary structural coal; Moisture content.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500503

Evaluation of the anti-osteoporotic effect of Ginkgo biloba L. in Wistar rats with glucocorticoid-induced-osteoporosis by bone densitometry using dual-energy x-ray absorptiometry (DEXA) and mechanical testing
Provedor de dados: 42
Autores: LUCINDA,LEDA M.F.; AARESTRUP,BEATRIZ J.V.; REBOREDO,MAYCON M.; PAINS,THAIS D.A.; CHAVES,RAPHAEL Z.; REIS,JOÃO E.P.; LOUZADA,MÁRIO J.Q.; GUERRA,MARTHA O.
ABSTRACT Evaluate the effect of the extract of Ginkgo biloba in the bone alkaline phosphatase, bone mineral density, in the mechanical properties of the tibia in rats with glucocorticoid-induced-osteoporosis. After osteoporosis induction, the rats were divided into five groups: Osteoporosis; EGb1 (28 mg/Kg); EGb2 (56 mg/Kg); alendronate (0.2 mg/animal) and control. The animals were treated during 20 and 30 days. The control group was compared with the osteoporosis’s (Student’s t-test), while the other were analyzed by ANOVA test followed by Tukey/Dunnett’T3 (p&lt;0.05). In the osteoporosis group the bone alkaline phosphatase, bone mineral density, the bone stiffness, the maximum load and the resilience were reduced. The bone alkaline phosphatase values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone density; DEXA scan; Ginkgo biloba; Osteoporosis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602833

Evaluation of deciduous broadleaf forests mountain using satellite data using neural network method near Caspian Sea in North of Iran
Provedor de dados: 42
Autores: HASHEMI,SEYED A.
ABSTRACT During the recent decades, deciduous forests have been molested by human intervention. Easy access, abundance and diversity of valuable forest products have led to increased population density, creating new residential areas and deforestation activities. Revealing changes is one of the fundamental methods in management and assessment of natural resources. This study is evaluated changes in forests area of 2013 using satellite images. In order to mapping the forest extent condition 2013, images of the mentioned years were digitized and geo-referenced by using the ground control points and the maps of mapping organization. After selecting the best set of band using the Bhattacharya distance index, the image classification was performed by using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Satellite data; ETM+; Forest area; Classification.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602357

Taxonomic distinctness and conservation of a new high biodiversity subterranean area in Brazil
Provedor de dados: 42
Autores: GALLÃO,JONAS E.; BICHUETTE,MARIA ELINA.
Subterranean environments, even though they do not possess a primary production (photosynthesis), may present high biodiversity, faunistic originality, endemism, phylogenetic isolations and unique ecological and/or evolution events, in addition to rare taxa. Studies investigating the biological diversity in Neotropical caves are relatively rare and recent, and most of them have been conducted in Brazil. We sampled caves from the state of Bahia, northeastern Brazil, and through sampling sufficiency tests and richness estimators, we demonstrate that the normatization for the Brazilian cave laws is not adequate for its conservation and that only α diversity index is not enough to verify faunistic patterns. We suggest that a phylogenetic diversity index be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cave conservation; Endemisms; Faunistic singularity; Speleological brazilian laws; Troglobites.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100209

Acoustic evolution in crickets: need for phylogenetic study and a reappraisal of signal effectiveness
Provedor de dados: 42
Autores: Desutter-Grandcolas,Laure; Robillard,Tony.
Cricket stridulums and calls are highly stereotyped, except those with greatly modified tegmina and/or vena-tion, or ''unusual'' frequency, duration and/or intensity. This acoustic diversity remained unsuspected until recently, and current models of acoustic evolution in crickets erroneously consider this clade homogeneous for acoustic features. The few phylogenetic studies analyzing acoustic evolution in crickets demonstrated that acoustic behavior could be particularly labile in some clades. The ensuing pattern for cricket evolution is consequently extremely complex. We argue that: (1) phylogeny should always be considered when analyzing acoustic evolution, whatever characters are considered (signals, stridulums or behaviors). Consequently, future...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic communication; Evolution; Phylogeny; Calling song effectiveness; Crickets.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200019

Population dynamics of Siderastrea stellata Verrill, 1868 from Rocas Atoll, RN: implications for predicted climate change impacts at the only South Atlantic atoll
Provedor de dados: 42
Autores: PINHEIRO,BARBARA R.; PEREIRA,NATAN S.; AGOSTINHO,PAULA G.F.; MONTES,MANUEL J.F.
ABSTRACT Coral reefs are one of the most vulnerable ecosystems to ocean warming and acidification, and it is important to determine the role of reef building species in this environment in order to obtain insight into their susceptibility to expected impacts of global changes. Aspects of the life history of a coral population, such as reproduction, growth and size-frequency can contribute to the production of models that are used to estimate impacts and potential recovery of the population, acting as a powerful tool for the conservation and management of those ecosystems. Here, we present the first evidence of Siderastrea stellata planulation, its early growth, population size-frequency distribution and growth rate of adult colonies in Rocas Atoll. Our...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Coral reefs; Rocas Atoll; Siderastrea stellata; South Atlantic Ocean.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300873

Functional role of a glycolipid in directional movements of neurons
Provedor de dados: 42
Autores: MENDEZ-OTERO,ROSALIA; SANTIAGO,MARCELO F.
Migration of neurons from their site of origin to their final destination is a critical and universal step in the formation of the complex structure of the nervous system. The migratory process is thought to be governed in part by genetically and epigenetically defined sequences of signals which are interpreted by migrating cells. The molecular mechanisms that underlie neuronal migration have been the subject of intense investigation. As in other developmental processes, many molecules must participate in neuronal migration. Some molecules, such as cell adhesion molecules and motor proteins, may contribute to discrete steps in the migration act; others, like extracellular signaling molecules, may regulate the activation and/or termination of the migration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycolipid; Ganglioside; 9-O-acetyl GD3; Neuronal Migration; Neurite outgrowth; Development.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200007

Removal of synthetic sex hormones by hydrothermal carbonization
Provedor de dados: 42
Autores: MORAIS,RUITER L.; SANTIAGO,MARIÂNGELA F.; ZANG,JOACHIM W.; FONSECA-ZANG,WARDE A.; SCHIMIDT,FERNANDO.
ABSTRACT One of the most prominent fields of environmental chemistry is the study and the removal of micro-pollutants from aqueous matrices. Analytical techniques for their identification and quantification are becoming more sensitive and comprehensive and, as a result, an increasing number of drugs have been detected in environmental samples. However, the literature shows that conventional treatments for drinking water and wastewater are not sufficient for remove these compounds. This study aims to check whether the process of hydrothermal carbonization (CHT) is effective in removing the synthetic sex hormones: ethinyl estradiol, gestodene and cyproterone acetate from aqueous samples. The system used in CHT basically consists of a pressurized reactor made...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrothermal carbonization; Liquid chromatography; Endocrine disruptors; Remediation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401327

Climatic characteristics of the 2010-2016 drought in the semiarid Northeast Brazil region
Provedor de dados: 42
Autores: MARENGO,JOSÉ A.; ALVES,LINCOLN M.; ALVALA,REGINA C.S; CUNHA,ANA PAULA; BRITO,SHEILA; MORAES,OSVALDO L.L.
ABSTRACT This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. The analysis of this event using drought indicators as well as meteorological fields shows that since the middle 1990s to 2016, 16 out of 25 years experienced rainfall below normal. This suggests that the recent drought may have in fact started in the middle-late 1990s, with the intense droughts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Northeast Brazil; Rainfall; Water deficit; El Nino; Vulnerability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501973

Nanoencapsulated Melaleuca alternifolia essential oil exerts anesthetic effects in the brachyuran crab using Neohelice granulate
Provedor de dados: 42
Autores: SOUZA,CARINE F.; LIMA,TÁBATA; BALDISSERA,MATHEUS D.; GEIHS,MÁRCIO A.; MACIEL,FÁBIO E.; NERY,LUIZ E.M.; SANTOS,ROBERTO C.V.; RAFFIN,RENATA P.; HEINZMANN,BERTA M.; CARON,BRAULIO O.; BALDISSEROTTO,BERNARDO.
ABSTRACT The aim of this study was to evaluate the efficacy and safety of several anesthetics in the brachyuran crab Neohelice granulata, an emergent experimental model. The essential oils (EOs) of Lippia alba, Aloysia tryphilla, and Melaleuca alternifolia (tea tree oil; TTO), the isolated compounds eugenol, menthol, terpinen-4-ol, and the nanoencapsulated form of TTO, were administered in one or more of the following ways: added to the water (immersion), through an arthrodial membrane (injected), or by oral gavage. Unexpectedly, most EOs did not produce an anesthetic effect after immersion. Only TTO and eugenol induced anesthesia by immersion, with very long induction and recovery times compared to anesthesia of other crustaceans. However, a good...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anesthesia; Eugenol; Terpinen-4-ol; Nanotechnology; Invertebrate; Tea-tree-oil.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602855

Grafting height does not affect Fusarium wilt control or horticultural performance of Passiflora gibertii N.E.Br. rootstock
Provedor de dados: 42
Autores: LIMA,LUCAS K.S.; SANTOS,IDÁLIA S. DOS; GONÇALVES,ZANON S.; SOARES,TALIANE L.; JESUS,ONILDO N. DE; GIRARDI,EDUARDO A.
Abstract The influence of the grafting height (5, 10, 20 and 30 cm above the root collar) of P. edulis on P. gibertii was evaluated on the incidence of Fusarium wilt and horticultural performance. Plants of P. gibertii grafted on P. edulis and non-grafted plants of both species were also studied. In addition, histopathological studies were also performed on the roots of non-grafted P. edulis collected at three severity stages of Fusarium wilt. In greenhouse, the graft take was inversely related to the grafting height in general. In the field conditions, the plant growth of P. gibertii grafted on P. edulis was superior to its reciprocal grafting, even though the former combination was susceptible to Fop. Plants of P. edulis grafted on P. gibertii at all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis; Fusarium oxysporum f.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703525

Is the secondary thickening in palms always diffuse?
Provedor de dados: 42
Autores: BOTÂNICO,MARLI P.; ANGYALOSSY,VERONICA.
Unlike other arboreal monocotyledons, the secondary growth of palms has for the past 100 years been described as diffuse. Solely cell enlargement and random parenchyma divisions, without the activity of a meristem, characterize such growth. Some previous works of the early 20th century have, however, mentioned the presence of a secondary meristem in the stems of palms, but this information was forgotten since then. Addressing to this question, we analysed palm stems of four species, with the aim to understand the possible presence of such secondary growth. We found that a meristematic band occurs between the cortex and the central cylinder and gives rise to new vascular bundles and parenchyma internally, producing parenchyma and fibres externally. It...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerial stem; Meristematic band; Palms; Secondary growth; Stem anatomy; Subterranean stem.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401461

Mesenchymal stem cells for the treatment of neurodegenerative and psychiatric disorders
Provedor de dados: 42
Autores: COLPO,GABRIELA D.; ASCOLI,BRUNA M.; WOLLENHAUPT-AGUIAR,BIANCA; PFAFFENSELLER,BIANCA; SILVA,EMILY G.; CIRNE-LIMA,ELIZABETH O.; QUEVEDO,JOÃO; KAPCZINSKI,FLÁVIO; ROSA,ADRIANE R.
Mesenchymal stem cells (MSCs) are multipotent progenitor cells that have the capacity to differentiate into all lineages of mesodermal origin, e.g., cartilage, bone, and adipocytes. MSCs have been identified at different stages of development, including adulthood, and in different tissues, such as bone marrow, adipose tissue and umbilical cord. Recent studies have shown that MSCs have the ability to migrate to injured sites. In this regard, an important characteristic of MSCs is their immunomodulatory and anti-inflammatory effects. For instance, there is evidence that MSCs can regulate the immune system by inhibiting proliferation of T and B cells. Clinical interest in the use of MSCs has increased considerably over the past few years, especially because...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mesenchymal stem cells; Treatment; Neurodegenerative disease; Psychiatric disorders.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301435

Inventory and assessment of geosites to stimulate regional sustainable management: the northern coast of the state of São Paulo, Brazil
Provedor de dados: 42
Autores: GARCIA,MARIA DA GLÓRIA M.; LAMA,ELIANE A. DEL; MARTINS,LUCELENE; MAZOCA,CARLOS EDUARDO M.; BOUROTTE,CHRISTINE L.M.
Abstract: The reviewed and integrated geoheritage inventory of the northern coast of the state of São Paulo, Brazil, resulted in 43 geosites distributed in eight geological frameworks. The selected geosites are representative of a geological history from the Neoproterozoic (Brasiliano-Pan African Cycle) to the recent, covering a minimum 700-Ma timespan. Considering the dynamic character of geoheritage inventories, the results presented in this work were based on previous local, town-based surveys, which were reviewed under the light of new geological data and geoconservation methods. Both qualitative and quantitative geosites assessments were used to discuss their geological representativeness and relevance, as well as legal aspects regarding protection...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; São Paulo; Geological heritage; Geoheritage management; Inventory; Public policies.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300501

37 years of scientific activity in a Biochemistry Department in Brazil: patterns of growth and factors leading to increased productivity
Provedor de dados: 42
Autores: Gomes,Urubatã E.; Oliveira,Diogo L. de; Berti,Luciana C.; Amaral,Olavo; Souza,Diogo O.; Wofchuk,Susana T.
Scientific activity in Brazil has experienced an accelerated growth in the past decades, with an increase in productivity that greatly surpasses the international average. This growth has occurred mostly at the expense of centers of excellence in public universities, which account for the vast majority of the country's scientific output. The aim of this study was to evaluate the production of the Department of Biochemistry of a large public university in southern Brazil (Universidade Federal do Rio Grande do Sul), as well as to identify internal and external policies that have influenced this growing production profile. We have performed a historical analysis of the scientific output of this Department of Biochemistry, which accounts for a considerable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scientific productivity; Scientific growth profile; Biochemistry; UFRGS.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300030

Gill parasites of fish from two estuaries in northeastern Brazil: new hosts and geographical records
Provedor de dados: 42
Autores: GOLZIO,JÉSSICA E.S.A.; FALKENBERG,JÚLIA M.; PRAXEDES,RAYSSA C.G.; COUTINHO,ANDERSON S.; LAURINDO,MYLENA K.; PESSANHA,ANDRÉ; MADI,RUBENS R.; PATRÍCIO,JOANA; VENDEL,ANA L.; SOUZA,GEZA T.R.; MELO,CLÁUDIA M.; LACERDA,ANA CAROLINA F.
ABSTRACT Parasites are important components of communities and constitute great part of the biological diversity found in ecosystems, providing valuable information about their hosts and the environment in which they live. However, despite its importance, parasitic diversity is still not well known in some regions of Brazil, especially with respect to fish parasites in the Northeast Region. The present study aims to perform the survey of gill parasites of fish from two tropical estuaries located in northeastern Brazil: Paraíba and Mamanguape rivers. Two collections were made in each estuary, one during the dry period (November / 2013) and the other during the rainy season (July / 2014). The fish were caught using a beach seine net, dragged along the main...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish parasites; Parasite diversity; Ectoparasites; Tropical estuaries.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502281

New information on molecular features of the dengue virus type 3, panorama of the amphibian research in Brazil, and a new extinct Cretaceous angiosperm
Provedor de dados: 42
Autores: KELLNER,ALEXANDER W.A.
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401547

The rates and players of denitrification, dissimilatory nitrate reduction to ammonia (DNRA) and anaerobic ammonia oxidation (anammox) in mangrove soils
Provedor de dados: 42
Autores: LUVIZOTTO,DANICE M.; ARAUJO,JULIANA E.; SILVA,MICHELE DE CÁSSIA P.; DIAS,ARMANDO C. F.; KRAFT,BEATE; TEGETMEYE,HALINA; STROUS,MARC; ANDREOTE,FERNANDO D.
Abstract Mangroves are ecosystems located in the transition zone between land and sea, characterized by periodic flooding that confer to its unique characteristics. Little is known about the transformation of nutrients that occur during the organic matter degradation in this system. In this study, we monitor the nitrogen transformations in soils from three mangroves with distinct levels of contamination using labeled 15NO3-. We also screened the mangroves metagenomes for the presence of genes that encode enzymes involved in denitrification (nirS, nirK, nosZ, norB and narG), anaerobic oxidation of ammonia (anammox) (hh, hao and hzo) and dissimilatory nitrate reduction to ammonium (DNRA) (nrfA). The transformations of 15NO3- indicated the balance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N cycling; Anaerobiosis; Metagenome; Environmental contamination.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000200503

Brazilian fruit processing, wastes as a source of lipase and other biotechnological products: a review
Provedor de dados: 42
Autores: OKINO-DELGADO,CLARISSA H.; PRADO,DÉBORA Z.; FLEURI,LUCIANA F.
Abstract The global food loss and waste is the most urgent research area in food science to attend the current demand for more sustainable and profitable processes. Along the productive chain about 1/3 of the food is lost or wasted, this number reaches 1/2 for fruit and vegetable production in developing countries. Brazil has been investing in researches aiming to turn its wastes into byproducts, as biomolecules of high value such as lipases. These enzymes are found in a high diversity of plant sources and their researches are covered by promising market growth expectations due to the current demand for biofuels and bio-transformed food. Thus, the aim of the present study is to discuss the potential of wastes generated by the Brazilian fruit processing to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fruit waste; Biorefinery; Plant lipase; Orange waste; Papaya peel and seed; Mango peel.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602927

Role of the medulla oblongata in normal and high arterial blood pressure regulation: the contribution of Escola Paulista de Medicina - UNIFESP
Provedor de dados: 42
Autores: Cravo,Sergio L.; Campos,Ruy R.; Colombari,Eduardo; Sato,Mônica A.; Bergamaschi,Cássia M.; Pedrino,Gustavo R.; Ferreira-Neto,Marcos L.; Lopes,Oswaldo U.
Several forms of experimental evidence gathered in the last 37 years have unequivocally established that the medulla oblongata harbors the main neural circuits responsible for generating the vasomotor tone and regulating arterial blood pressure. Our current understanding of this circuitry derives mainly from the studies of Pedro Guertzenstein, a former student who became Professor of Physiology at UNIFESP later, and his colleagues. In this review, we have summarized the main findings as well as our collaboration to a further understanding of the ventrolateral medulla and the control of arterial blood pressure under normal and pathological conditions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypertension; Baroreceptor reflexes; Vasomotor nuclei; Sympathetic nerve activity; Arterial pressure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300021

New technique of intragastric sleeve: viability and survival in a pig model
Provedor de dados: 42
Autores: RIBEIRO,MARIANA S.; ZORRON,RICARDO P.A.S.; SILVA,SAULO JOSÉ Q.; CADENA,SILVIA M.R.; ANTUNES,FERNANDA; SANTOS JUNIOR,MARCELO B. DOS; MELLO,LUCIANA M.; IGREJA JUNIOR,HAROLDO JOSÉ S.; BATISTA,VILSON L.; SCHEFFER,JUSSARA P.; OLIVEIRA,ANDRÉ L.A.
Abstract Developing a less invasive, practical and cost-effective operative technique for obesity treatment represents a pressing need for our society. In this way, intragastric single port sleeve by endoplication was tested in six pigs during 18 weeks. Celiotomy was performed with animal placed in dorsal decubitus position. Single port gastrostomy was performed and double tobacco pouch sutures were made in fundic region, making a gastric sleeve. At the end, stomach layers and skin were closed in a conventional manner. Means and the standard deviations of surgical time were calculated. The procedure was simple and all animals survived; there were no significant blood loss and no intra and postoperative complications. The procedure was fast (67.4 minutes)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bariatric; Intragastric plicature; Invasiviness; Single-port.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603075

Chemical constituents of Distictella elongata (Vahl) Urb. (Bignoniaceae)
Provedor de dados: 42
Autores: SIMÕES,LEANDRO R.; MACIEL,GLAUBER M.; BRANDÃO,GERALDO C.; FILHO,JOSÉ D.S.; OLIVEIRA,ALAÍDE B.; CASTILHO,RACHEL O.
Pectolinarin, a flavone heteroside, was isolated from Distictella elongata (Vahl) Urb. leaves ethanol extract, along with a mixture of ursolic, pomolic and oleanolic acids, besides β-sitosterol. Their structures were established on the basis of spectral analysis (1H and 13C NMR, 1D and 2D) and they were compared with literature. This is the first report on the occurrence of this flavonoid in a species of the Bignoniaceae family.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bignoniaceae; Distictella elongata; Pectolinarin; Triterpenes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300873

Antifungal activities of the essential oil and its fractions rich in sesquiterpenes from leaves of Casearia sylvestris Sw.
Provedor de dados: 42
Autores: PEREIRA,FLAVIANE G.; MARQUETE,RONALDO; DOMINGOS,LEVY T.; ROCHA,MARCO E.N.; FERREIRA-PEREIRA,ANTONIO; MANSUR,ELISABETH; MOREIRA,DAVYSON L.
ABSTRACT Casearia genus (Salicaceae) is found in sub-tropical and tropical regions of the world and comprises about 160-200 species. It is a medicinal plant used in South America, also known as “guaçatonga”, “erva-de-tiú”, “cafezinho-do-mato”. In Brazil, there are about 48 species and 12 are registered in the State of Rio de Janeiro, including Casearia sylvestris Sw. There are many studies related to the chemical profile and cytotoxic activities of extracts from these plants, although few studies about the antifungal potential of the essential oil have been reported. In this work, we have studied the antifungal properties of the essential oil of C. sylvestris leaves, as well as of their fractions, against four yeasts (Saccharomyces cerevisae, Candida...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida sp.; Casearia genus; Essential oil; Medicinal plant; Saccharomyces cerevisae.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602817

The preventive effects of ascorbic acid supplementation on locomotor and acetylcholinesterase activity in an animal model of schizophrenia induced by ketamine
Provedor de dados: 42
Autores: DAMAZIO,LOUYSE S.; SILVEIRA,FLÁVIA R.; CANEVER,LARA; CASTRO,ADALBERTO A. DE; ESTRELA,JADNE M.; BUDNI,JOSIANE; ZUGNO,ALEXANDRA I.
ABSTRACT Studies have shown that schizophrenic patients seem to have nutritional deficiencies. Ascorbic acid (AA) has an important antioxidant effect and neuromodulatory properties. The aim of this study was to evaluate the effects of AA on locomotor activity and the acetylcholinesterase activity (AChE) in an animal model of schizophrenia (SZ). Rats were supplemented with AA (0.1, 1, or 10 mg/kg), or water for 14 days (gavage). Between the 9th and 15th days, the animals received Ketamine (Ket) (25 mg/kg) or saline (i.p). After the last administration (30 min) rats were subjected to the behavioral test. Brain structures were dissected for biochemical analysis. There was a significant increase in the locomotor activity in Ket treated. AA prevented the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schizophrenia; Ascorbic acid; Ketamine; Hyperlocomotion; Acetylcholinesterase.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000301133

Study of heavy metal concentration and partitioning in the Estrela River: implications for the pollution in Guanabara Bay - SE Brazil
Provedor de dados: 42
Autores: Rangel,Carlos M. A.; Baptista Neto,José A.; Fonseca,Estefan M.; McAlister,John; Smith,Bernard J.
In this study, the geochemical analysis of ten sediment samples collected along the fluvial system of the Estrela River, which flows into the northern portion of Guanabara Bay, shows the presence of anthropogenic impacts in this area. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni obtained were slightly higher, when compared with values found innatural environments. The particle size and organic matter content in most of the analyzed stations showed featuresnot conducive to the accumulation of pollutants due to the low organic matter content and the strong presence ofsand fraction. There was also the fractionation of heavy metals in sediments and it was found the prominence ofresidual and reducible phase, besides the significant occurrence of organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estrela River; Guanabara Bay; Heavy metal; Fractionation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300005

Sequence stratigraphy of the Passa Dois Group in the Serra do Espigão, Paraná basin, Brazil
Provedor de dados: 42
Autores: Canuto,José Roberto.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400010

Acute toxicity of sodium metabisulphite on mangrove crab Ucides cordatus (Decapoda, Ucididae)
Provedor de dados: 42
Autores: Pedale,Adriana B.; Fujimoto,Rodrigo Y.; Santos,Rudã F.B.; Abrunhosa,Fernando A.
The sodium metabisulphite salt is usually used in shrimp culture to prevent black spot. Unfortunately the toxicological effect of this xenobiotic in decapod crabs is unknown. Thus, the present study aims to investigate the sodium metabisulphite LC50 - 96 h in the mangrove species Ucides cordatus. Crabs were collected in the tidal creek margins in Bragança estuarine and were submitted to preliminary test (screening) and posterior definitive test. Crabs were exposed in five different concentrations and a control group in five replicates, two crabs per recipient (5 L) during 96 hours. A negative correlation was observed to sodium metabisulphite concentration in relation to dissolved oxygen and pH. At the end of the experiment were obtained the following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shrimp culture; Environmental impact; Metabisulphite; Lethal concentration; Neotropical species.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400015

Simultaneous Determination of Furan and Vinyl Acetate in Vapor Phase of Mainstream Cigarette Smoke by GC-MS
Provedor de dados: 42
Autores: XU,AIFEI; FAN,ZHONG; CHEN,ZHIYAN; ZHOU,YUN; LIU,SHAOHUA; HUANG,SHIJIE; XU,XUEQUIN; LONG,CONGYUN; WANG,WEIGANG; ZHU,JING; LI,XIAOLAN; XU,CHUNPING.
ABSTRACT A simple and sensitive method for simultaneous determination of furan and vinyl acetate (VA) in vapor phase of mainstream cigarette smoke with cold trap and gas chromatography-mass spectrometry (GC-MS) was developed. A Cambridge filter pad (CFP) was placed in front of the impingers of smoking machine to remove the particle phase from cigarette smoke. Furan and VA in vapor phase of mainstream cigarette smoke were collected in two impingers connected in series by filled with methanol at -78°C. The solutions were added with deuterium-labeled furan-d4 and VA-d6 as internal standards and analyzed by GC-MS. The results showed that the calibration curves for furan and VA were linear (r2 &gt; 0.9995) over the studied concentration range. The intra- and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vapor phase; Mainstream cigarette smoke; Furan; Vinyl acetate; Cold trap; Gas chromatography-mass spectrometry.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200383

Glass Microbeads in Analog Models of Thrust Wedges
Provedor de dados: 42
Autores: D'ANGELO,TAYNARA; GOMES,CAROLINE J.S.
ABSTRACT Glass microbeads are frequently used in analog physical modeling to simulate weak detachment zones but have been neglected in models of thrust wedges. Microbeads differ from quartz sand in grain shape and in low angle of internal friction. In this study, we compared the structural characteristics of microbeads and sand wedges. To obtain a better picture of their mechanical behavior, we determined the physical and frictional properties of microbeads using polarizing and scanning electron microscopy and ring-shear tests, respectively. We built shortening experiments with different basal frictions and measured the thickness, slope and length of the wedges and also the fault spacings. All the microbeads experiments revealed wedge geometries that were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compressional deformation models; Sand; Microbeads; Physical and frictional characterizations.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100073

Regarding the real diversity of Glyptodontidae (Mammalia, Xenarthra) in the late Pliocene (Chapadmalalan Age/Stage) of Argentina
Provedor de dados: 42
Autores: ZURITA,ALFREDO E.; TAGLIORETTI,MATÍAS; DE LOS REYES,MARTÍN; CUADRELLI,FRANCISCO; POIRE,DANIEL.
ABSTRACT A large diversity of Glyptodontidae has been proposed as characterizing the Chapadmalalan Age (Pliocene). Most of these taxa were recognized on the basis of partial dorsal carapaces and/or caudal tubes, whereas the main diagnostic characteristic is a particular morphology of the exposed surface of the osteoderms. From a biostratigraphic point of view some species are biostratigraphically important. The Upper Chapadmalalan is based on the Paraglyptodon chapadmalensis biozone. Both the re-evaluation of the type and referred materials and new significant findings from the Chapadmalal and El Polvorín Formations indicate that the diversity of Pliocene Glyptodontidae is more limited than previously supposed. The particular morphology of the exposed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Glyptodonts; Osteoderms; Pliocene; Southern South America.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300809

Weedy ferns (Polypodiopsida) in Argentina: diversity, distribution and impact on human activities and ecosystems
Provedor de dados: 42
Autores: YAÑEZ,AGUSTINA; GUTIERREZ,DIEGO G.; PONCE,MARTA MÓNICA.
Abstract  Currently, in Argentina 368 species of true ferns (i.e. Polypodiopsida class) are distributed throughout the country, however, only four of them have been mentioned until now as weeds and ruderal species. The goal of this work was to generate an update of weedy ferns from Argentina, including morphology, distribution, and type of weed according to their impact on natural habitats and/or human activities. All Argentinian fern species were analyzed based on references, herbarium specimens, and field trips. As a result of our study 25 species were recorded from Argentina and classified as segetal, ecological, or aquatic weeds, and ruderal and/or toxic species. Current taxonomic identity, diagnostic characters, origins, habitats, geographical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthropized areas; Aquatic weed; Ecological weed; Ruderal weed; Segetal weed; Toxic plant.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100721

Microbiological Indicators of Soil Quality Under Native Forests are Influenced by Topographic Factors
Provedor de dados: 42
Autores: TEIXEIRA,ANITA F.S.; SILVA,JACQUELINE S.; VILELA,LAÍZE A.F.; COSTA,PATRÍCIA F.; COSTA,ELAINE M. DA; GUIMARÃES,AMANDA A.; SANTOS,JESSÉ V. DOS; SILVA,SÉRGIO H.G.; CARNEIRO,MARCO AURÉLIO C.; MOREIRA,FATIMA M.S.
Abstract: Several microbiological indicators of soil quality present high sensitivity, but little is known about the influence of topographic factors on them. This work aimed to evaluate variability of biological indicators of soil quality across a hillslope under native forest and the influence of topographic factors on them. Four positions on a hillslope were evaluated. Activity of the enzymes β-glucosidase, acid phosphatase, urease and fluorescein diacetate (FDA) hydrolysis were determined, as well as basal and substrate-induced respiration, and density of microorganisms: total bacteria, total fungi, actinobacteria, phosphate solubilizers, ammonifiers, native rhizobia, free-living N2-fixing bacteria, spores of arbuscular mycorrhizal fungi and percentage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological indicators; Digital elevation model; Enzymes; Microbial activity; Random forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700866

Automatic extraction of road seeds from high-resolution aerial images
Provedor de dados: 42
Autores: Dal-Poz,Aluir P.; Do Vale,Giovane M.; Zanin,Rodrigo B.
This article presents an automatic methodology for extraction of road seeds from high-resolution aerial images. The method is based on a set of four road objects and another set of connection rules among road objects. Each road object is a local representation of an approximately straight road fragment and its construction is based on a combination of polygons describing all relevant image edges, according to some rules embodying road knowledge. Each one of the road seeds is composed by a sequence of connected road objects, in which each sequence of this type can be geometrically structured as a chain of contiguous quadrilaterals. Experiments carried out with high-resolution aerial images showed that the proposed methodology is very promising in extracting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Road extraction; Road objects; Road seeds; Digital photogrammetry.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300011

Molecular marker assisted selection for increasing inbreeding in S1 populations of cassava
Provedor de dados: 42
Autores: OLIVEIRA,PAULO HENRIQUE G.A. DE; BARBOSA,ANA CLAUDIA O.; DINIZ,RAFAEL P.; OLIVEIRA,EDER J. DE; FERREIRA,CLAUDIA F.
Abstract The objective of the present work was to use MAS in self-pollinated cassava populations for obtaining individuals with high inbreeding (f) aimed at rapid development of partial inbred lines. Three progenies (F0222, F1378 and F1662) were self-pollinated, generating a total of 233 S1 individuals. The progenies and the S1 individuals were evaluated in the seedlings and clonal evaluation trials (CETs). In the CET, plants were evaluated for the following traits: plant height (PH), root dry matter content (DMC), above ground yield (AGY), root (RY) and starch yield (SY). Twenty-seven microsatellites and five minisatellites were used to determine the level of inbreeding of the S1 individuals. Inbreeding (f) values varied from 0.15 to 0.89 within...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Partial inbred lines; Manihot esculenta Crantz; Microsatellites; Self-pollination.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703853

Soluble fractalkine in the plasma of fibromyalgia patients
Provedor de dados: 42
Autores: GARCIA,JUAN J.; ORTEGA,EDUARDO.
Fibromyalgia is a form of non-articular rheumatism in which inflammatory cytokines seem to be involved. However, there is still no analytical specific diagnostic criterion for this disease. The aim was to examine a possible role of fractalkine as a biomarker in fibromyalgia. Plasma levels of soluble fractalkine were compared between women diagnosed with fibromyalgia (n=17) and healthy women (n=10) as controls. Fractalkine released by monocytes was also evaluated. Fibromyalgia patients showed lower plasma fractalkine than healthy women. Since most inflammatory pathologies show elevated plasma levels of soluble fractalkine, the results may contribute towards a differential diagnosis for fibromyalgia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fractalkine; Fibromyalgia; Biomarker; Chemokine; Monocyte.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401915

Pouteria ramiflora extract inhibits salivary amylolytic activity and decreases glycemic level in mice
Provedor de dados: 42
Autores: GOUVEIA,NEIRE M. DE; ALBUQUERQUE,CIBELE L. DE; ESPINDOLA,LAILA S.; ESPINDOLA,FOUED S.
In this study, extracts of plant species from the Cerrado biome were assessed in order to find potential inhibitors of human salivary alpha-amylase. The plants were collected and extracts were obtained from leaves, bark, and roots. We performed a preliminary phytochemical analysis and a screening for salivar alpha-amylase inhibitory activity. Only three botanical families (Sapotaceae, Sapindaceae and Flacourtiaceae) and 16 extracts showed a substantial inhibition (&gt;75%) of alpha-amylase. The ethanolic extracts of Pouteria ramiflora obtained from stem barks and root barks decreased amylolytic activity above 95% at a final concentration of 20 µg/mL. Thus, adult male Swiss mice were treated orally with P. ramiflora in acute toxicity and glycemic control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha-amylase inhibition; Hypoglycemia; Pouteria ramiflora; Sapotaceae.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301141

Hepatic steatosis associated with microsporidiosis in teleost fishes from Marajó Island, Brazil
Provedor de dados: 42
Autores: VIDEIRA,MARCELA; VELASCO,MICHELE; MATOS,PATRÍCIA; CLEMENTE,SÉRGIO C. DE SÃO; SANCHES,OSIMAR; SANTOS,PATRÍCIA; MATOS,EDILSON.
A total of 40 specimens of the teleost fish Gobioides grahamae Palmer &amp; Wheeler, 1955 were obtained from the municipality of Salvaterra on Marajó Island in the Brazilian state of Pará. Their livers were removed and processed for light microscopy. Overall, 90% of the specimens presented some degree of steatosis of the liver, which was invariably associated with the presence of Microsporidium sp. The present study confirms the occurrence of steatosis in G. grahamae associated with parasitic infections by Microsporidium. The findings indicate that the condition of otherwise healthy fishes in their natural environment may be affected negatively by parasites.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marajó Island; Gobioides grahamae; Liver; Steatosis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301347

Karyological studies in Brazilian species of Lippia L. (Verbenaceae)
Provedor de dados: 42
Autores: Sousa,Saulo M.; Torres,Giovana A.; Viccini,Lyderson F.
The genus Lippia (Verbenaceae) comprise around 160 species spread out mainly in South and Central Americas with few African species, some of them with potential medicinal use. Brazil is one the most important centers of diversity with approximately 75% of the species described so far. Innumerous species are endemic and poorly studied especially at a cytological level. Here, chromosomal length, karyomorphology and chromosome asymmetry of twelve Brazilian species of Lippia were evaluated [L. alba (Miller) N.E.Brown, L. diamantinensis Glaz., L. florida Cham., L. hermanioides Cham., L. lacunosa Mart. &amp;amp; Schauer, L. lupulina Cham., L. pohliana Schauer, L. pseudothea (St. Hil) Schauer, L. rosella Moldenke, L. rotundifolia Cham., L. rubella Moldenke and L....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Cytology; Dysploidy; Karyology; Lippia; Polyploidy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400017

On Maurício M. Peixoto and the arrival of Structural Stability to Rio de Janeiro, 1955
Provedor de dados: 42
Autores: JORGE,SOTOMAYOR.
Abstract This essay is a historical exploration of the circumstances, and subsequent mathematical consequences, of the encounter, in 1955, of Maurício M. Peixoto (1921 - 2019) with the work of Henry F. DeBaggis (1916 - 2002) on Structural Stability, Princeton 1952, developing a notion introduced by Alexander A. Andronov and Lev S. Pontrjagin, Gorkii 1937.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andronov; DeBaggis; Lefschetz; Peixoto; Structural Stability; Differential Equations.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100301

Lines of principal curvature on canal surfaces in R³
Provedor de dados: 42
Autores: Garcia,Ronaldo; Llibre,Jaume; Sotomayor,Jorge.
In this paper are determined the principal curvatures and principal curvature lines on canal surfaces which are the envelopes of families of spheres with variable radius and centers moving along a closed regular curve in R³. By means of a connection of the differential equations for these curvature lines and real Riccati equations, it is established that canal surfaces have at most two isolated periodic principal lines. Examples of canal surfaces with two simple and one double periodic principal lines are given.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riccati equation; Principal curvature lines; Canal surfaces.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300002