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Search Results: 1 - 10 of 290503 matches for " Jo?o B.;Silva "
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Deconvolu??o de Euler: passado, presente e futuro - um tutorial
Barbosa, Valéria C. F;Silva, Joo B. C;
Revista Brasileira de Geofísica , 2005, DOI: 10.1590/S0102-261X2005000300004
Abstract: in this tutorial we present a historical overview of the evolution of euler deconvolution method consisting of three sections. in the first section, we recall the euler deconvolution 2d and 3d classic formulation as a method to automatically locate sources of potential fields anomalies and point out the difficulties of this formulation: the presence of an undesirable spray of solutions, the empiric criteria used to determine the structural index (a parameter related with the source nature), the feasibility of applying euler deconvolution to small ground data survey, and the determination of the dip and susceptibility contrast of geological contact (or the product of the susceptibility contrast and the thickness when applied to thin dike). in the second section, we present recent improvements aiming at minimizing some of the difficulties presented in the first section. they include: i) selecting the solutions essentially associated with observations presenting the largest signal-to-noise ratios; ii) using the correlation between the estimated anomaly baselevel and the observed anomaly itself or combining euler deconvolution with the analytic signal to determine the structural index; iii) combining the results from (i) and (ii) to allow estimating the structural index independently of the number of solutions so that a small number of observations (such as in a ground survey) may be used; and iv) introducing additional equations, which are independent from euler's equation to estimate the dip and susceptibility of 2d sources. in the third section we provide a short- to medium-term outlook into future developments. the main prospects are: i) furthering the improvements on the problems singled out in the second section; ii) developing methods to take vertical and lateral interferences into accounts; and iii) incorporating euler deconvolution to constrain the source location estimates and use them in inversion methods to obtain a source delineation in a user-friendly comp
Nutritional Quality and Health Benefits of Vegetables: A Review  [PDF]
Joo Silva Dias
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.310179
Abstract: Vegetables are considered essential for well-balanced diets since they supply vitamins, minerals, dietary fiber, and phytochemicals. Each vegetable group contains an unique combination and amount of these phytonutriceuticals, which distinguishes them from other groups and vegetables whithin their own group. In the daily diet vegetables have been strongly associated with improvement of gastrointestinal health, good vision, and reduced risk of heart disease, stroke, chronic diseases such as diabetes, and some forms of cancer. Some phytochemicals of vegetables are strong antioxidants and are thought to reduce the risk of chronic disease by protecting against free radical damage, by modifying metabolic activation and detoxification of carcinogens, or even by influencing processes that alter the course of tumor cells. All the vegetables may offer protection to humans against chronic diseases. Nutrition is both a quantity and a quality issue, and vegetables in all their many forms ensure an adequate intake of most vitamins and nutrients, dietary fibers, and phytochemicals which can bring a much-needed measure of balance back to diets contributing to solve many of these nutrition problems. The promotion of healthy vegetable products has coincided with a surging consumer interested in the healthy functionality of food. Because each vegetable contains a unique combination of phytonutriceuticals, a great diversity of vegetables should be eaten to ensure that individual’s diet includes a combination of phytonutriceuticals and to get all the health benefits. This article make a review and discusses the nutritional quality and health benefits of the major groups of vegetables. More interdisciplinary work is required that involves nutritional and food scientists as well as others from biomedical fields to ascertain the thrue function of specific phytonutriceuticals.
Nutritional Quality and Effect on Disease Prevention of Vegetables  [PDF]
Joo Silva Dias
Food and Nutrition Sciences (FNS) , 2019, DOI: 10.4236/fns.2019.104029
Abstract: Vegetables have remarkable nutritional and health benefits. There are good reasons to include vegetables in human diet since they are enriched in bioactive compounds and by this reason they may help reduce the risk of some diseases. In this paper it was analyzed the nutrition quality and effect on disease prevention of vegetables. Each vegetable family and each vegetable contain a unique combination of bioactive compounds. The health benefit of vegetables should not be linked to one type of vegetable. It is presented some experimental research evidences that vegetables exert anti-oxidative, anti-carcinogenic, anti-diabetic and cardiovascular disease lowering effects. The mechanism by which vegetable bioactive compounds decrease the risk of some of these diseases is complex and sometimes unknown.
Alpha Defensins Genes and Vulvovaginal Candidiasis: A Study of Cases  [PDF]
Humberto F. Boatto, Elaine C. Francisco, Joo P. Kleine, Ismael D. Silva, Manoel J. B. C. Gir?o, Alexandre P. Machado, Olga Fischman
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.59071
Abstract: Objective: To evaluate the alpha-defensin (α-DF) genes polymorphism in women with vulvovaginal candidiasis and recurrence. Methods: This observational study included clinical vaginal secretion samples collected over four years from 88 women, ranging in age from 18 to 65 years, from medical centers of Sao Paulo and Mogi das Cruzes, Brazil. Thirty-six of these women were asymptomatic (control group) and 52 presented clinical condition compatible with vulvovaginitis (38 primary or episodic as non-recurrent forms, and 14 recurrent vulvovaginal candidiasis). A portion of each sample was plated on Sabouraud dextrose agar with chloramphenicol and grown on CHROMagar Candida for presumptive characterization. The identification of the species was obtained by sequencing of the ITS1 region of rDNA. α-DF genes were amplified for subsequent evaluation of polymorphisms by endonuclease restriction assay. Results: From 88 samples were isolated 60 Candida albicans and 28 non-albicans Candida spp. Resistant C. albicans strains and non-albicans Candida spp. were more prevalent in recurrence. In all groups, the number of resistant non-albicans Candida spp. was most high than susceptible strains. α-DF1, α-DF3 and α-DF1/α-DF3 genotypes were found in 32 (36.4%), 17 (19.3%), 6 (6.8%) vaginal samples, respectively. About 33 samples were not amplified. Recurrence and
Characterization and Bioaccessibility of Minerals in Seeds of Salvia hispanica L.  [PDF]
Aline D. Barreto, érika M. R. Gutierrez, Mauro R. Silva, Fabiano O. Silva, Nilton O. C. Silva, Inayara C. A. Lacerda, Renata A. Labanca, Raquel L. B. Araújo
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.715204
Abstract: Salvia hispanica L. is a herbacia plant that originates from Mexico and Guatemala, and it is currently known by the popular name of chia. Currently, chia seeds have been considered to be of great importance for human health and nutrition because they have a high concentration of polyunsaturated fatty acids. They contain the largest known percentage of fatty α-linolenic acid (ALA) in plants—approximately 68%. Furthermore, they are an excellent source of protein, dietary fiber, calcium, magnesium, iron, vitamin B and phenolic compounds that have antioxidant properties. However, despite the high nutritional value present in the food and the possible health benefits of its nutrients, there is a need to evaluate the bioaccessibility of its micronutrients to measure their effectiveness. Thus, we evaluated the chemical composition of chia seeds from different producers, their lipid profiles and the bioaccessibility of some of their minerals.
Climate risk in maize crop in the northeastern of Brazil based on climate change scenarios
Silva, Vicente de P. R. da;Campos, Joo H. B. da C.;Silva, Madson T.;
Engenharia Agrícola , 2012, DOI: 10.1590/S0100-69162012000600019
Abstract: this study evaluates the impacts of climate change on the agricultural zoning of climatic risk in maize crop cultivated in the northeastern of brazil, based on the intergovernmental panel on climate change (ipcc) reports. the water balance model, combined with geospatial technologies, was used to identify areas of the study region where the crops could suffer yield restrictions due to climate change. the data used in the study were the time series of rainfall with at least 30 years of daily data, crop coefficients, potential evapotranspiration and duration of the crop cycle. the scenarios of the increasing of air temperature used in the simulations were of 1.5oc, 3oc and 5oc. the sowing date of maize crop from january to march appears to be less affected by warming scenarios than the sowing in november and december or april and may.
Impacto do aquecimento global no cultivo do feij?o-caupi, no Estado da Paraíba
Campos, Joo H. B. da C.;Silva, Madson T.;Silva, Vicente de P. R. da;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010000400008
Abstract: this study evaluates the impacts of climate change, based on the reports of the ipcc, on the agricultural zoning of climatic risk of the rainfed cowpea (vigna unguiculata l. walp) crop grown in the paraíba state. the water balance model combined with gis techniques was used for identifying areas in the state where the cowpea crop will suffer yield restrictions due to climate changes. model input variables were: rainfall, crop coefficients, potential evapotranspiration and duration of the crop cycle. the limit value of 0.5 was adopted for the water requirement satisfaction index (wrsi). the date acceptable for seeding was that when the water balance simulation presented, for at least 80% minimum frequency, wrsi value greater than that limit value. an increase in air temperature of 3 and 6 oc, as suggested by the ipcc, will cause a significant reduction in the areas currently favorable for cowpea crop growth in the paraíba state.
Tolerancia de mamoneira ao herbicida pendimethalin em solos com diferentes capacidades de adsor o Tolerance of castor bean to pendimethalin herbicide in soils with different adsorption capacities
Karoliny C. Silva,Vivianny N. B. Silva,Valdinei Sofiatti,Joo H. Zonta
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/s1415-43662012001200006
Abstract: A mamoneira é uma espécie de crescimento inicial lento. A ausência de herbicidas registrados para esta cultura, ainda é fator limitante para sua expans o; assim, objetivou-se, com este trabalho, avaliar a tolerancia da mamoneira ao herbicida pendimethalin em solos com diferentes capacidades de adsor o. O experimento foi conduzido em casa de vegeta o, em delineamento inteiramente casualizado com cinco repeti es e consistiu em uma combina o fatorial de oito doses do herbicida pendimethalin aplicado em pré-emergência (0; 187,5; 375; 750; 1.500; 3.000; 6.000 e 12.000 g ha-1 i.a.) e quatro tipos de substrato, sendo três solos de textura: franco-argilo-arenosa, franco-argilosa e franco-arenosa, além do substrato arenoso. Aos 22 dias após a semeadura determinaram-se as variáveis altura de plantas, área foliar, massa fresca e seca da parte aérea, volume e massa seca do sistema radicular. Concluiu-se que a dose do herbicida pendimethalin tolerado pela mamoneira é influenciada pela capacidade de adsor o do solo. O herbicida mostrou-se seletivo à cultura n o ocasionando redu o do crescimento nas doses utilizadas para controle de plantas daninhas. The castor bean is a species of slow initial growth. The absence of registered herbicides for this crop is still a limiting factor for its expansion. The aim of this study was to evaluate the castor bean tolerance to the herbicide pendimethalin in soils with different adsorption capacities. The experiment was conducted under greenhouse conditions in a completely randomized design with five replications and consisted of a factorial combination of eight doses of the herbicide pendimethalin applied as pre-emergence (0; 187,5; 375; 750; 1500; 3000; 6000 and 12000 g ha-1 i.a.), and four types of substrate (clay loam, sandy clay loam, sandy loam and sandy soil). At 22 days after sowing the variables: plant height, leaf area, fresh and dry mass of shoots, root system volume and dry weight were determined. It was concluded that the dose of the herbicide pendimethalin tolerated by the castor bean is influenced by the adsorption capacity of the soil. The herbicide was found to be very selective to this crop, not causing significant reduction of plant growth at the doses indicated to be used for weed control.
Climate risk in maize crop in the northeastern of Brazil based on climate change scenarios Riscos climáticos para o milho no nordeste do Brasil com base em cenários de mudan a do clima
Vicente de P. R. da Silva,Joo H. B. da C. Campos,Madson T. Silva
Engenharia Agrícola , 2012,
Abstract: This study evaluates the impacts of climate change on the agricultural zoning of climatic risk in maize crop cultivated in the Northeastern of Brazil, based on the Intergovernmental Panel on Climate Change (IPCC) reports. The water balance model, combined with geospatial technologies, was used to identify areas of the study region where the crops could suffer yield restrictions due to climate change. The data used in the study were the time series of rainfall with at least 30 years of daily data, crop coefficients, potential evapotranspiration and duration of the crop cycle. The scenarios of the increasing of air temperature used in the simulations were of 1.5oC, 3oC and 5oC. The sowing date of maize crop from January to March appears to be less affected by warming scenarios than the sowing in November and December or April and May. Este estudo avalia os impactos das altera es climáticas sobre o zoneamento agrícola de risco climático do milho cultivado na regi o Nordeste do Brasil, com base nos relatórios do IPCC (Intergovernmental Panel on Climate Change). O modelo de balan o hídrico, combinado com técnicas de geoprocessamento, foi utilizado para identificar as áreas da regi o de estudo onde a cultura poderá sofrer restri es de rendimento devido à mudan a do clima. Os dados utilizados no estudo foram as séries históricas de precipita o, com no mínimo 30 anos de dados diários, coeficientes de cultura, evapotranspira o potencial e a dura o do ciclo da cultura. Os cenários de aumento na temperatura do ar utilizados nas simula es foram de 1,5; 3,0 e 5,0 oC. A época de semeadura, de janeiro a mar o, da cultura de milho é menos afetada pelos cenários de aquecimento do que a semeadura nos meses de novembro e dezembro ou de abril e maio.
Fitotoxidade de herbicidas aplicados em pós-emergência na fase inicial da cultura do milho
Magalh?es, Paulo C.;Silva, Joo B. da;Dur?es, Frederico O. M.;
Planta Daninha , 2000, DOI: 10.1590/S0100-83582000000200009
Abstract: herbicide application at post emergence stage may cause injuries to maize plants, when these plants are reached randomly by non selective products. since these herbicides act basically blocking metabolic processes , the question which has been raised is concerned what are the effects that these injuries will result in the grain production. therefore the objective of this work was to study the phytotoxic effects caused by the application of herbicides at the initial phase and at late post emergency stage of the crop and its effect in the grain production. it was used the hybrid brs 3123, with 12 treatments in 4 replications. these treatments were performed by the combination of the application of the following herbicides: cyanazine + simazine with or without assist, applied at growth stages of 4 and 6 corn leaves; paraquat + extravon and ametryn + assist, applied as directed spray at the growth stage of 12 leaves. in addition, it was included the treatment with and without hoeing and the defoliation of first and third pair of leaves at the 12 leaf stage. it was evaluated: leaf area, dry matter, chlorophyl content in the leaves, plant height, ear height, ear index, weight of ears and grains. the first year (1994/95) the variables of growth were not affected by the treatments, whereas at the following year (1995/96), the best development of plants was obtained by the application of cyanazine + simazine, and the worst treatments were paraquat + extravon, ametryn + assist and the plot without hoeing. the greater production of ears and grains at first year came from the treatment cyanazine + simazine + assist, whereas in the second year, paraquat + extravon and ametryn + assist resulted in the best yield. application of herbicides in post emergence at the initial phase of the crop, besides providing a good weed control, did not affect the development of maize plant.
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