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Idioma Inglês (55) Espanhol (1) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 57 Primeira ... 1 2 3 ... Última On-farm broiler welfare assessment and associated training Rev. Bras. Ciênc. Avic. Butterworth,A. Around the world, people who care for animals as stock keepers, stockmen, farmers, producers are placed in a position where they can greatly influence the quality of life of the animals they manage. This is particularly true in broiler chickens, where large numbers of animals can be cared for by comparatively small numbers of people. There is an international progression to start to assess poultry welfare on farm by looking at the animals themselves using (Animal Based Measures ABMs) rather than by looking exclusively at the resources provided (space, light heat, litter material - Resource Based Measures RBM's). In general, the areas being assessed are: Are the animals properly fed and supplied with water? Are the animals properly housed? Are the animals... Tipo: Info:eu-repo/semantics/article Palavras-chave: Poultry assessment; Farm assessment; Welfare Quality protocol; Animal based measures; Outcome based measures; Resource based measures; Welfare score; Aggregation; Management support; Principles; Criteria. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000200001 Physical quality of an Oxisol after different periods of management systems Rev. Bras. Ciênc. Solo Rossetti,Karina de Vares; Centurion,José Frederico; Sousa Neto,Eurico Lucas de. Management systems may lead to a loss of soil physical quality as a result of removal of the plant cover and excessive agricultural mechanization. The hypothesis of this study was that the soil aggregate stability, bulk density, macro- and microporosity, and the S index and saturated hydraulic conductivity may be used as indicators of the soil physical quality. The aim was to study the effects of different periods and managements on the physical attributes of a medium-textured Red Oxisol under soybean and corn for two growing seasons, and determine which layers are most susceptible to variations. A completely randomized experimental design was used with split plots (five treatments and four layers), with four replications. The treatments in 2008/09... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; S index; Saturated hydraulic conductivity. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600009 Aggregate stability as affected by short and long-term tillage systems and nutrient sources of a hapludox in southern Brazil Rev. Bras. Ciênc. Solo Veiga,Milton da; Reinert,Dalvan José; Reichert,José Miguel. The ability of a soil to keep its structure under the erosive action of water is usually high in natural conditions and decreases under frequent and intensive cultivation. The effect of five tillage systems (NT = no-till; CP = chisel plowing and one secondary disking; CT = primary and two secondary distings; CTb = CT with crop residue burning; and CTr = CT with removal of crop residues from the field), combined with five nutrient sources (C = control, no nutrient application; MF = mineral fertilizers according to technical recommendations for each crop; PL = 5 Mg ha-1 y-1 fresh matter of poultry litter; CM = 60 m³ ha-1 y-1 slurry cattle manure; and SM = 40 m³ ha-1 y-1 slurry swine manure) on wet-aggregate stability was determined after nine years (four... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil tillage; Manure; Sampling time; Soil structure; Aggregation. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000400003 Aggregate stability by the "high energy moisture characteristic" method in an oxisol under differentiated management Rev. Bras. Ciênc. Solo Silva,Érika Andressa da; Oliveira,Geraldo César de; Silva,Bruno Montoani; Carducci,Carla Eloize; Avanzi,Junior Cesar; Serafim,Milson Evaldo. Studies testing the High Energy Moisture Characteristic (HEMC) technique in tropical soils are still incipient. By this method, the effects of different management systems can be evaluated. This study investigated the aggregation state of an Oxisol under coffee with Brachiaria between crop rows and surface-applied gypsum rates using HEMC. Soil in an experimental area in the Upper São Francisco region, Minas Gerais, was studied at depths of 0.05 and 0.20 m in coffee rows. The treatments consisted of 0, 7, and 28 Mg ha-1 of agricultural gypsum rates distributed on the soil surface of the coffee rows, between which Brachiaria was grown and periodically cut, and compared with a treatment without Brachiaria between coffee rows and no gypsum application. To... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Coffee production; Management systems; Method. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500028 Charge sparsity: An index to quantify cation effects on clay dispersion in soils Scientia Agricola Melo,Thadeu Rodrigues de; Machado,Wesley; Tavares Filho,João. ABSTRACT: Few approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more... Tipo: Info:eu-repo/semantics/article Palavras-chave: Colloids; Electrical double layer; Aggregation; Flocculation; Zeta potential. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101400 An assemblage of terrestrial isopods (Crustacea) in southern Brazil and its contribution to leaf litter processing Zoologia Quadros,Aline F.; Araujo,Paula B.. We present an assemblage of terrestrial isopods in Parque Estadual de Itapuã, southern Brazil, and estimate the contribution of two species to the leaf litter processing. After one year of sampling, we obtained 3748 individuals of six species and four eco-morphologic groups (in order of abundance): Balloniscus glaber Araujo & Zardo, 1995, Atlantoscia floridana (van Name, 1940), Pseudodiploexochus tabularis (Giambiagi de Calabrese, 1939), Trichorhina sp., Alboscia itapuensis Araujo & Quadros, 2005 and Novamundoniscus gracilis Lopes & Araujo, 2003. Total monthly density corresponded to 368 individuals per square meter. The species A. itapuensis and N. gracilis represented less than 1% of total individuals. All the others showed... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Eco-morphological groups; Feeding rates; Isopoda; Species association. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000100009 Diversity of metazoan parasites in Colossoma macropomum (Serrasalmidae) from the lower Jari River, a tributary of the Amazonas River in Brazil Acta Amazonica GONÇALVES,Bianca Barata; OLIVEIRA,Marcos Sidney Brito; BORGES,William Felix; SANTOS,Gracienhe Gomes; TAVARES-DIAS,Marcos. ABSTRACT This study investigated the diversity of metazoan parasites in Colossoma macropomum from the Jari River, in the eastern Amazon, northern Brazil. We collected a total of 4966 parasites from 34 fishes, including monogeneans (Anacanthorus spathulatus, Mymarothecium boegeri, Notozothecium janauachensis and Linguadactyloides brinkmanni), nematodes (Spectatus spectatus larvae, Contracaecum sp. larvae andProcamallanus (Spirocamallanus) inopinatus), digeneans (Cladorchiidae metacercariae), acanthocephalans (Neoechinorhynchus buttnerae), crustaceans (Ergasilus turucuyus, Argulus multicolor, Perulernaea gamitanae and Braga patagonica), mites and leeches. The dominance was of monogenean species, found in the gills of the hosts. The parasites exhibited high... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Diversity; Endoparasites; Freshwater fish. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300211 Parasitic diversity of a wild Satanoperca jurupari population, an ornamental cichlid in the Brazilian Amazon Acta Amazonica TAVARES-DIAS,Marcos; OLIVEIRA,Marcos Sidney Brito; GONÇALVES,Raissa Alves; NEVES,Lígia Rigor. ABSTRACT Assessment of biodiversity is fundamental for the understanding of ecological interactions, but fish parasites were neglected in biodiversity estimates for a long time. The aim of this paper was to investigate the diversity of parasites in Satanoperca jurupari in the Amazon River system in Brazil. Of the fish examined, 90.0% were parasitized by one or more species of protozoans and metazoans, and a total of 3,110,094 parasites were collected. Ichthyophthirius multifiliis, Piscinoodinium pillulare, Sciadicleithum juruparii, Clinostomum marginatum, Posthodiplostomum sp., Genarchella genarchella, Argulus multicolor and Ergasilus coatiarus were found. However, I. multifiliis and P. pillulare were the most prevalent, abundant and dominant parasites,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Cichlidae; Freshwater fish; Parasites. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000200155 ECOLOGICAL ASPECTS OF THE PARASITES IN Cichlasoma bimaculatum (CICHLIDAE), ORNAMENTAL FISH FROM THE BRAZILIAN AMAZON Acta biol.Colomb. TAVARES-DIAS,Marcos; ALVES GONÇALVES,Raissa; BRITO OLIVEIRA,Marcos Sidney; RIGÔR NEVES,Ligia. ABSTRACT This study investigated the parasitic fauna of Cichlasoma bimaculatum of a tributary from the Amazon River system, northern Brazil. The prevalence of infection was 94.6 % and, in total, 428 267 parasites, such as Ichthyophthirius multifiliis, Piscinoodinium pillulare (Protozoa), Gussevia arilla (Monogenoidea), Posthodiplostomum sp. (Digenea) and Procamallanus (Spirocamallanus) inopinatus (Nematoda) were collected. However, the dominance was mainly of I. multifiliis, while P. (S.) inopinatus was the parasite species with the lower levels of prevalence and abundance of infection. These parasite species showed an aggregated dispersion pattern. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Endoparasites; Freshwater fish; Infection. Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2017000200006 Spatial distribution, association patterns and richness of tree species in a seasonal forest from the Serra Geral formation, southern Brazil Acta Botanica Sühs,Rafael Barbizan; Budke,Jean Carlos. This study aimed to determine the spatial distribution of the most abundant tree species, to look for relationships that may be responsible for their distribution and to compare the expected richness along the Serra Geral formation in the state of Rio Grande do Sul , Brazil. An one-hectare plot was divided in 100 contiguous 10 x 10 m sampling units and all individuals with at least 4.8 cm diameter at breast high were measured and identified. Each sampling unit received a description of the spatial position through metric coordinates (x,y) in order to quantify the spatial pattern. Later, an association index among species was applied. The observed richness was rarefied and compared to other surveys located on the slopes of Serra Geral in Rio Grande do Sul.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Rarefaction; Diversity metrics; Spatial association; Aggregation. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000300014 Diversity of parasites in wild Astronotus ocellatus (Perciformes, Cichlidae), an ornamental and food fish in Brazil Anais da ABC (AABC) 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 Physiopathological modulators of amyloid aggregation and novel pharmacological approaches in Alzheimer's disease Anais da ABC (AABC) 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 Dispersal of Cotesia flavipes in sugarcane field and implications for parasitoid releases Bragantia Dinardo-Miranda,Leila Luci; Fracasso,Juliano Vilela; Costa,Viviane Pereira da; Lopes,Diego Olympio Teixeira. Diatraea saccharalis Fabr. (Lepidoptera: Crambidae) is a major sugarcane pest in Brazil. The management of infested areas is based on the release of Cotesia flavipes (Cameron) (Hymenoptera: Braconidae), a parasitoid of D. saccharalis larvae, but there are doubts about the effectiveness of C. flavipes, primarily regarding its rate of dispersal in sugarcane fields. Thus, the objective of this study was to evaluate the dispersal of C. flavipes in a sugarcane field and suggest a release method that provides higher parasitoid efficiency. The study was carried out in four areas of approximately 1 ha, in which stalk pieces containing 20 D. saccharalis larvae were distributed in a rectangular grid, and 12,000 C. flavipes adults were released at four points, that... Tipo: Info:eu-repo/semantics/article Palavras-chave: Sugarcane borer; Diatraea saccharalis; Biological control; Aggregation; Pest management. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000200011 Stabilization of partially folded states in protein folding/misfolding transitions by hydrostatic pressure BJMBR Ferreira,S.T.; Chapeaurouge,A.; De Felice,F.G.. In the last few years, hydrostatic pressure has been extensively used in the study of both protein folding and misfolding/aggregation. Compared to other chemical or physical denaturing agents, a unique feature of pressure is its ability to induce subtle changes in protein conformation, which allow the stabilization of partially folded intermediate states that are usually not significantly populated under more drastic conditions (e.g., in the presence of chemical denaturants or at high temperatures). Much of the recent research in the field of protein folding has focused on the characterization of folding intermediates since these species appear to be involved in a variety of disease-causing protein misfolding and aggregation events. The exact mechanisms of... Tipo: Info:eu-repo/semantics/article Palavras-chave: High pressure; Protein folding; Misfolding; Amyloid; Aggregation. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800009 Volume and energy folding landscape of prion protein revealed by pressure BJMBR Cordeiro,Y.; Kraineva,J.; Winter,R.; Silva,J.L.. The main hypothesis for prion diseases proposes that the cellular protein (PrP C) can be altered into a misfolded, ß-sheet-rich isoform, the PrP Sc (from scrapie). The formation of this abnormal isoform then triggers the transmissible spongiform encephalopathies. Here, we discuss the use of high pressure as a tool to investigate this structural transition and to populate possible intermediates in the folding/unfolding pathway of the prion protein. The latest findings on the application of high pressure to the cellular prion protein and to the scrapie PrP forms will be summarized in this review, which focuses on the energetic and volumetric properties of prion folding and conversion. Tipo: Info:eu-repo/semantics/article Palavras-chave: Prion; High pressure; Structural conversion; Aggregation. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800006 Genomics and X-ray microanalysis indicate that Ca2+ and thiols mediate the aggregation and adhesion of Xylella fastidiosa BJMBR Leite,B.; Ishida,M.L.; Alves,E.; Carrer,H.; Pascholati,S.F.; Kitajima,E.W.. The availability of the genome sequence of the bacterial plant pathogen Xylella fastidiosa, the causal agent of citrus variegated chlorosis, is accelerating important investigations concerning its pathogenicity. Plant vessel occlusion is critical for symptom development. The objective of the present study was to search for information that would help to explain the adhesion of X. fastidiosa cells to the xylem. Scanning electron microscopy revealed that adhesion may occur without the fastidium gum, an exopolysaccharide produced by X. fastidiosa, and X-ray microanalysis demonstrated the presence of elemental sulfur both in cells grown in vitro and in cells found inside plant vessels, indicating that the sulfur signal is generated by the pathogen surface.... Tipo: Info:eu-repo/semantics/other Palavras-chave: Xylella fastidiosa; Aggregation; Adhesion; Methionine sulfoxide reductase; Biofilm. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000600003 Relationship between raindrops and ultrasonic energy on the disruption of a Haplic Cambisol Ciência e Agrotecnologia Ribeiro,Bruno Teixeira; Lima,José Maria de; Mello,Carlos Rogério de; Sá,Marcos Aurélio Carolino de; Oliveira,Geraldo César de. The aim of this work was to compare aggregate disruption of undisturbed soil samples by ultrasonic energy to aggregate disruption caused by the energy of simulated raindrops, to provide equations that can describe this relationship, and to evaluate whether aggregate stability, expressed by sonication method, may be used to estimate the effect that raindrops have on undisturbed soil samples. Undisturbed soil samples from A, Bi and C horizons of a Cambisol were submitted to different levels of ultrasonic energy and simulated raindrops. Sieved samples (aggregates) were also submitted to different levels of ultrasonic energy so that both disturbed and undisturbed conditions of samples could be compared. The results showed that the method using ultrasonic... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregation; Soil structure; Ultrasound. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000300021 Registros recuperados: 57 Primeira ... 1 2 3 ... Última

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