|
|
|
| Registros recuperados: 2.719 | |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
| Registros recuperados: 2.719 | |
|
|
|
