1,166 research outputs found
In vitro screening and chemometrics analysis on a series of azole derivatives with fungicide activity against moniliophthora perniciosa
Moniliophthora perniciosa, the causal agent of witches' broom disease in Theobroma cacao, significantly decreased cacao production, especially in Bahia State, the largest cocoa producing of the American continent. Control programs developed so far have low efficiency. Azole derivatives are active both in vitro and in loco against M. perniciosa, however there is no comprehensive study on the activity of azoles against this phytopatogen. Standardized in vitro biological data were employed to develop supervised and unsupervised chemometric models that highlight physicochemical and structural features that are crucial for azole's fungicidal activity against M. perniciosa. Thus, PCA and SIMCA models suggest that electronegativity (BEHe3) and dipolar moment (JGI4), as well as H-bonding to M. pernciosa's lanosterol 14α-desmethylase active site and lack of Cl atoms 6 to 8 bonds from the azole's nitrogen atoms play a major role to azoles' fungicide activity
Detailed Analysis of Nearby Bulgelike Dwarf Stars II. Lithium Abundances
Li abundances are derived for a sample of bulgelike stars with isochronal
ages of 10-11 Gyr. These stars have orbits with pericentric distances, Rp, as
small as 2-3 kpc and Zmax < 1 kpc. The sample comprises G and K dwarf stars in
the metallicity range -0.80<[Fe/H]< +0.40. Few data of Li abundances in old
turn-off stars (> 4.5 Gyr) within the present metallicity range are available.
M67 (4.7 Gyr) and NGC 188 (6 Gyr) are the oldest studied metal-rich open
clusters with late-type stars. Li abundances have also been studied for few
samples of old metal-rich field stars. In the present work a high dispersion in
Li abundances is found for bulgelike stars for all the metallicity range,
comparable with values in M67. The role of metallicity and age on a Li
depletion pattern is discussed. The possible connection between Li depletion
and oxygen abundance due to atmospheric opacity effects is investigated.Comment: 9 pages, 7 figure
Propriedades fÃsicas e infiltração de água de um Latossolo Vermelho Amarelo (Oxisol) do noroeste do estado de São Paulo, Brasil, sob três condições de uso e manejo
This study presents the results obtained in a field experiment carried out at Glicério, Northwest of São Paulo state, Brazil, whose objective was to analyze changes of selected soil physical properties and water infiltration rates on a Yellow-Red Latosol, under three different management conditions. The experimental design was arranged as completely randomized split-block with twelve treatments, which corresponded to four depths (0-0.05 m; 0.05-0.10 m; 0.10-0.20 m and 0.20-0.40 m) and three conditions of soil use and management with four replications. The soil surface conditions were: conventional tillage (one disking with moulboard plus two levelling passes with harrow), nine months before starting filed experiences; recent conventional tillage (also one disking with moulboard plus two levelling passes with harrow) and native forest. The conventional tillage areas were cropped for about fifteen years with annual cultures. The considered soil general physical properties were: macroporosity, microporosity, total porosity, bulk density, soil moisture and penetration resistance and, in addition; soil water infiltration rates were also recorded. According to our results, differences on general soil physical properties and infiltration rates appeared when both tilled sub-treatments and native forest were compared. Both, plots recently prepared by conventional tillage and those prepared by tillage but left nine months in rest, presented a statistically significant decrease of constant (final) water infiltration rates of 92.72% and 91.91% when compared with native forest plots
Seed predation and germination of Peltogyne gracilipes (Ducke) in three forest types on Maracá Island, Roraima, Brazil
Genetic homogeneity in the deep-sea grenadier Macrourus berglax across the North Atlantic Ocean
Paucity of data on population structure and connectivity in deep sea species remains a major obstacle to their sustainable management and conservation in the face of ever increasing fisheries pressure and other forms of impacts on deep sea ecosystems. The roughhead grenadier Macrourus berglax presents all the classical characteristics of a deep sea species, such as slow growth and low fecundity, which make them particularly vulnerable to anthropogenic impact, due to their low resilience to change. In this study, the population structure of the roughhead grenadier is investigated throughout its geographic distribution using two sets of molecular markers: a partial sequence of the Control Region of mitochondrial DNA and species-specific microsatellites. No evidence of significant structure was found throughout the North Atlantic, with both sets of molecular markers yielding the same results of overall homogeneity. We posit two non-mutually exclusive scenarios that can explain such outcome: i) substantial high gene flow among locations, possibly maintained by larval stages, ii) very large effective size of post-glacially expanded populations. The results can inform management strategies in this by-caught species, and contribute to the broader issue of biological connectivity in the deep ocean
Three-vortex configurations in trapped Bose-Einstein condensates
We report on the creation of three-vortex clusters in a
Bose-Einstein condensate by oscillatory excitation of the condensate. This
procedure can create vortices of both circulation, so that we are able to
create several types of vortex clusters using the same mechanism. The
three-vortex configurations are dominated by two types, namely, an
equilateral-triangle arrangement and a linear arrangement. We interpret these
most stable configurations respectively as three vortices with the same
circulation, and as a vortex-antivortex-vortex cluster. The linear
configurations are very likely the first experimental signatures of predicted
stationary vortex clusters.Comment: 4 pages, 4 figure
Avaliação Nutricional de um Suplemento Alimentar
A escolha da nutrição mais adequada tem sido um tema estudado com grande interesse ao longo da história da humanidade tendo em conta a manutenção da Saúde, mas igualmente com outras finalidades como o atraso do envelhecimento ou outros benefÃcios.
O desafio colocado pela ingestão de frutos, vegetais, cereais, azeite e vinho aplicado pela intitulada Dieta Mediterrânica torna possÃvel o entendimento de paÃses com diversas etnias, culturas, economia e religiões, todos eles à volta do mar Mediterrâneo.
Por outro lado, o contÃnuo aparecimento de patologias como os acidentes vasculares cerebrais, o cancro e a aterosclerose podem ser de algum modo minimizadas pela ingestão de alguns compostos bioativos presentes nos alimentos, os chamados nutracêuticos e alimentos funcionais. O objetivo deste trabalho foi fazer uma revisão dos estudos publicados sobre os efeitos do licopeno na saúde humana, uma abordagem da respetiva quÃmica, fontes, biodisponibilidade e do potencial possÃvel papel e mecanismos desempenhado na prevenção de determinadas doenças crónicas e no cancro.
O licopeno é um dos antioxidantes mais potentes conhecidos, constituindo porventura o carotenóide mais importante presente na dieta, maioritariamente fornecido através do tomate e derivados. Atendendo a que o organismo humano não consegue sintetizar este composto de novo, este tem obrigatoriamente que ser fornecido pela dieta. No entanto, a sua biodisponibilidade pode ser afetada por inúmeros fatores tais como a forma de digestão da matriz alimentar, a temperatura de confecção, pela presença de outras gorduras no alimento, dosagem e outros compostos solúveis, incluindo os outros carotenóides. Esses fatores causam a libertação de licopeno a partir da matriz de alimentos e alteram assim a sua biodisponibilidade.info:eu-repo/semantics/publishedVersio
Species of Neosilba (Diptera: Lonchaeidae) recorded in citrus-producing region in the state of Pará, Brazil.
This work reports on the species of Lonchaeidae obtained from fruits of Citrus sinensis (L.) Osbeck collected in the citrus-producing region of the state of Pará, Brazil. The species registered were Neosilba glaberrima (Wiedemann), N. pendula (Bezzi, 1919) and N. zadolicha McAlpine & Steyskal, 1982
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