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Search Results: 1 - 10 of 688408 matches for " MARTA. A. S.;LIMA "
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Erradica??o de Fusarium oxysporum em sementes de alfafa utilizando termo e quimioterapia
MENDES, MARTA. A. S.;LIMA, PAULA M. M. P.;FONSECA, JOSé N. L.;SANTOS, MARIA F.;
Fitopatologia Brasileira , 2001, DOI: 10.1590/S0100-41582001000200005
Abstract: the dry thermal treatment was conducted in a continuous air flux chamber on alfafa (medicago sativa) seeds with relative humidity under 5%. seeds underwent a pre-treatment for 60 °c during three or six hours, followed by a treatment at 90 °c for three or six hours. the wet treatment was conducted in water bath, and consisted of a pre-treatment at 40 °c for 10, 20 or 30 min, and then treatments at 50 °c or 60 °c for 10, 20 or 30 min. the chemicals tested were benomyl, thiabendazole, iprodione and thiram, at the dosages recommended by their manufactures and also at three times these dosages. the wet thermal treatment at 40 °c for 20 min, followed by the treatment at 50 °c for 20 min, were effective in the eradication of fusarium oxysporum, but significantly affected the alfafa seed germination. the dry thermal treatment at 60 °c for 3 h, followed by the treatment of 90 °c for 3 to 6 h, eradicated f. oxysporum without a significant reduction in seed germination. benomyl was the most efficient chemical product in eradicating f. oxysporum without affecting the alfalfa seed germination.
Erradica o de Fusarium oxysporum em sementes de alfafa utilizando termo e quimioterapia
MENDES MARTA. A. S.,LIMA PAULA M. M. P.,FONSECA JOSé N. L.,SANTOS MARIA F.
Fitopatologia Brasileira , 2001,
Abstract: Sementes de alfafa (Medicago sativa) contaminadas in vitro com Fusarium oxysporum foram submetidas a tratamento térmico seco, térmico úmido e químico, visando a erradica o deste patógeno. O tratamento térmico seco foi realizado em camara com fluxo de ar constante, em sementes com umidade relativa abaixo de 5%, pré-tratamento a 60 °C por 3 ou 6 h, seguido do tratamento a 90 °C por 3 ou 6 h. O tratamento térmico úmido foi realizado em banho-maria, com pré-tratamento a 40 °C por 10, 20 ou 30 min e tratamentos a 50 °C ou 60 °C por 10, 20 e 30 min. Os produtos químicos testados foram benomyl, thiabendazole, iprodione e thiram, nas dosagens recomendadas pelos fabricantes e o triplo dessas dosagens. Foram avaliados os efeitos dos tratamentos no controle de F. oxysporum, pelo método de "Blotter test", e na germina o das sementes. O tratamento térmico úmido, 40 °C por 20 min, seguido de 50 °C por 20 min, erradicou o patógeno F. oxysporum, mas reduziu significativamente a germina o das sementes. O tratamento térmico seco a 60 °C por 3 h, seguido de 90 oC por 3 ou 6 h de exposi o, erradicou F. oxysporum sem alterar significativamente a germina o das sementes. Benomyl foi o mais eficiente dos produtos químicos testados, erradicando F. oxysporum sem afetar a germina o das sementes de alfafa.
Efeito do branqueamento, processo osmótico, tratamento térmico e armazenamento na estabilidade da vitamina C de pedúnculos de caju processados por métodos combinados
SOUZA FILHO, Men de Sá M.;LIMA, Janice R.;SOUZA, Artur C. R.;SOUZA NETO, Manuel A.;COSTA, Marta C.;
Ciência e Tecnologia de Alimentos , 1999, DOI: 10.1590/S0101-20611999000200010
Abstract: cashew apples were processed by combined methods. major physical and chemical changes were ph decrease, soluble solids and reducing sugars increase. ascorbic acid loss was 23,3% after bleaching, 31,7% after one day osmosis, 35,5% after five day osmosis, 69,0% after heat treatment and 87,3% after 60 days storage at ambient temperature (~ 28° c).
Antimicrobial activity, cytotoxicity and intracellular growth inhibition of Portuguese Thymus essential oils
Dandlen, Susana A.;Lima, A. Sofia;Mendes, Marta D.;Miguel, M. Gra?a;Faleiro, M. Leonor;Sousa, M. Jo?o;Pedro, Luís G.;Barroso, José G.;Figueiredo, A. Cristina;
Revista Brasileira de Farmacognosia , 2011, DOI: 10.1590/S0102-695X2011005000155
Abstract: thyme essential oils are well recognized by their excellent biological activities and the antimicrobial activity of portuguese thyme essential oils has been investigated with promising results, particularly against food borne pathogens. in this study the potential antimicrobial activity of the essential oils of five species of thymus (lamiaceae), namely th. caespititius brot., th. camphoratus hoffmanns. & link, th. capitellatus hoffmanns. & link., th. carnosus boiss. and th. zygis l. was evaluated against candida albicans, haemophilus influenza, helicobacter pylori, listeria monocytogenes, salmonella enterica and streptococcus pneumoniae. h. pylori strains were the most susceptible bacteria, particularly to the essential oils of th. caespititius (planalto central), th. zygis (rebord?os) and th. caespititius (pico) which minimum inhibitory concentration (mic) values ranged from 0.05 to 0.08 mg.ml-1. th. caespititius essential oil from planalto central or its main component, carvacrol significantly (p<0.05) inhibited the intracellular growth of h. pylori, and showed no citotoxicity to the gastric cell line. our results suggest the potential of this essential oil and its main component as a promising tool as anti-helicobacter agent potentiating the eradication of this important gastroduodenal pathogen.
Anti-inflammatory activities of the hydroalcoholic extracts from Erythrina velutina and E. mulungu in mice
Vasconcelos, Silvania M. M.;Sales, Gabriel T. M.;Lima, Natália;Lobato, Rodrigo de Freitas G.;Macêdo, Danielle Silveira;Barbosa-Filho, José Maria;Leal, Luzia Kalyne A. M.;Fonteles, Marta M. F.;Sousa, Francisca Cléa F.;Oliveira, Jeania Lima;Viana, Glauce S. B.;
Revista Brasileira de Farmacognosia , 2011, DOI: 10.1590/S0102-695X2011005000134
Abstract: this work studied the anti-inflammatory activities of the hydroalcoholic extracts (haes) from erythrina velutina willd. (ev) and e. mulungu mart. ex benth. (em) in the carrageenan- and dextran-induced mice hind paw edema models. these medicinal plants belonging to the fabaceae family are used in some brazilian communities to treat pain, inflammation, insomnia and disorders of the central nervous system. in the present work, the extracts were administered orally in male mice at the doses of 200 or 400 mg/kg. in the carrageenan-induced test, only em showed anti-inflammatory activity, decreasing the paw edema, at the doses of 200 and 400 mg/kg. no effect was observed with ev in this model. on the other hand, in the dextran model, ev demonstrated anti-inflammatory effect, showing decrease of the paw edema at the 1, 2, 3, 4 and 24th h. em (200 or 400 mg/kg) presented anti-inflammatory effect at the 2, 3 and 4th h after administration of dextran, as compared to control. in conclusion, the work showed that ev and em present anti-edematous actions, which possibly occurs by distinct mechanisms. while ev seems to interfere especially in inflammatory processes in which mast cells have an important role, em exerts greater activity in the inflammatory process that depends mainly on polymorphonuclear leucocytes. however, further studies are needed to determine the exact mechanism of action of the species investigated.
Alternative dark energy models: an overview
Lima, J. A. S.;
Brazilian Journal of Physics , 2004, DOI: 10.1590/S0103-97332004000200009
Abstract: a large number of recent observational data strongly suggest that we live in a flat, accelerating universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named dark energy or quintessence. the basic set of experiments includes: observations from sne ia, cmb anisotropies, large scale structure, x-ray data from galaxy clusters, age estimates of globular clusters and old high redshift galaxies (ohrg's). it is now widely believed that such results provide the remaining piece of information connecting the inflationary flatness prediction (wt = 1) with astronomical observations. from a theoretical viewpoint, they have also stimulated the current interest for more general models containing an extra component describing this unknown dark energy, and simultaneously accounting for the present accelerating stage of the universe. in this review we present a simplified picture of the main results and discuss briefly some difficulties underlying the emerging dark energy paradigm.
Alternative dark energy models: an overview
Lima J. A. S.
Brazilian Journal of Physics , 2004,
Abstract: A large number of recent observational data strongly suggest that we live in a flat, accelerating Universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named Dark Energy or Quintessence. The basic set of experiments includes: observations from SNe Ia, CMB anisotropies, large scale structure, X-ray data from galaxy clusters, age estimates of globular clusters and old high redshift galaxies (OHRG's). It is now widely believed that such results provide the remaining piece of information connecting the inflationary flatness prediction (W T = 1) with astronomical observations. From a theoretical viewpoint, they have also stimulated the current interest for more general models containing an extra component describing this unknown dark energy, and simultaneously accounting for the present accelerating stage of the Universe. In this review we present a simplified picture of the main results and discuss briefly some difficulties underlying the emerging dark energy paradigm.
Age of the Universe, Average Deceleration Parameter and Possible Implications for the End of Cosmology
J. A. S. Lima
Physics , 2007,
Abstract: A new expression to the total age of the Universe is derived in terms of the average deceleration parameter. This kinematic result holds regardless of the curvature of the universe as well as of the underlying gravity theory. It remains valid even in the context of brane-world motivated cosmologies. Since the present age parameter of the Universe is accurately adjusted to $H_0t_0 = 1$, it is shown that the time averaged value of the deceleration parameter is zero. This also means that the cosmic age today is exactly the one predicted by a relativistic flat cosmological model filled by K-matter, a fluid satisfying the equation of state $p = -{{1/3}}\rho$. By assuming the validity of this relation (in an average long time meaning), it is argued that the decelerating stages of the expansion must exactly be compensated by the accelerated phases, as if the observed Universe coasts forever. If this is true, the present accelerating stage must be followed by a subsequent decelerating phase as predicted by some recent scalar field and brane-world motivated cosmologies.
Thermodynamics of Decaying Vacuum Cosmologies
J. A. S. Lima
Physics , 1996, DOI: 10.1103/PhysRevD.54.2571
Abstract: The thermodynamic behavior of vacuum decaying cosmologies is investigated within a manifestly covariant formulation. Such a process corresponds to a continuous irreversible energy flow from the vacuum component to the created matter constituents. It is shown that if the specific entropy per particle remains constant during the process, the equilibrium relations are preserved. In particular, if the vacuum decays into photons, the energy density $\rho$ and average number density of photons $n$ scale with the temperature as $\rho \sim T^{4}$ and $n \sim T^{3}$. The temperature law is determined and a generalized Planckian type form of the spectrum, which is preserved in the course of the evolution, is also proposed. Some consequences of these results for decaying vacuum FRW type cosmologies as well as for models with ``adiabatic'' photon creation are discussed.
Cosmologies with Photon Creation and the 3K Relic Radiation Spectrum
J. A. S. Lima
Physics , 1996, DOI: 10.1023/A:1018850330860
Abstract: A new Planckian distribution for cosmologies with photon creation is derived using thermodynamics and semiclassical considerations. This spectrum is preserved during the evolution of the universe and compatible with the present spectral shape of the cosmic microwave background radiation(CMBR). Accordingly, the widely spread feeling that cosmologies with continuous photon creation are definitely ruled out by the COBE limits on deviation of the CMBR spectrum from blackbody shape should be reconsidered. It is argued that a crucial test for this kind of cosmologies is provided by measurements of the CMBR temperature at high redshifts. For a given redshift $z$ greater than zero, the temperature is smaller than the one predicted by the standard FRW model.
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