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Search Results: 1 - 10 of 9689 matches for " Viegas Neto "
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Modelo de simula??o de sistemas de pastejo rotativo e contínuo de azevém (Lolium multiflorum lam.) na bovinocultura
Silva Neto, Benedito;Schneider, Mariane;Viegas, Julio;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000400035
Abstract: the main objective of the paper is to propose a dynamic systems simulation model for the analysis of pasture management seeking to maximize animal intake. the forage used was annual ryegrass, grazed by bovine adults. the variables considered were: animal stocking density, forage growth rate, animal apprehension rate, first entrance of the animals in the pasture (beginning of grazing) and rotation cycle (period of grazing plus period of rest of the pasture). to simulate the pasture growth the verhulst equation was used. the computational model was programmed using software berkeley madonna. simulations with this software showed that when grazing started early (until the 73 days) the rotative system provided greater animal dry matter intake than the continuous grazing system. when the grazing started between 74 and 95 days the continuous system provided greater animal dry matter intake than the rotative system. the simulations also showed that when the rotative system started early (60 days), the cycle of 30 days (a day of grazing and 29 of rest) provided greater animal dry matter intake. when the rotative system started later (75 days), variations of the grazing cycle length had little influence on dry matter intake.
Modelo de simula o de sistemas de pastejo rotativo e contínuo de azevém (Lolium multiflorum lam.) na bovinocultura
Silva Neto Benedito,Schneider Mariane,Viegas Julio
Ciência Rural , 2006,
Abstract: O principal objetivo do trabalho é propor um modelo de simula o de sistemas dinamicos para a análise do manejo de pastagens visando a maximizar o consumo de forragem pelos animais. A forrageira utilizada foi o azevém anual, pastado por bovinos adultos. Foram consideradas diversas variáveis como: lota o animal, taxa de crescimento do pasto, taxa de apreens o da forragem pelos animais, primeira entrada dos animais na pastagem após a emergência (início do pastejo) e ciclo de rota o (soma dos dias de pastejo e de descanso do pasto). Para simular o crescimento do pasto, foi utilizada a equa o de Verhulst. Simula es efetuadas em um modelo computacional formulado no aplicativo Berkeley Madonna indicaram que, quando a entrada dos animais no pasto foi mais precoce (até os 73 dias), o sistema rotativo proporcionou um maior consumo de matéria seca pelos animais que o sistema de pastejo contínuo. Já quando a entrada dos animais no pasto foi entre os 74 e os 95 dias, o sistema contínuo proporcionou um maior consumo de matéria seca pelos animais que o sistema de pastejo rotativo. As simula es indicaram também que, quando o pastejo rotativo é iniciado precocemente (60 dias), o ciclo de 30 dias (um dia de pastejo e 29 de descanso) proporcionou maior consumo de matéria seca pelos animais. Já quando o pastejo rotativo é iniciado tardiamente (75 dias), varia es da extens o do ciclo de rota o tiveram pouca influência sobre o consumo de matéria seca pelos animais.
Sele??o de progênies de meio-irm?os de milho para eficiência no uso de nitrogênio
Heinz, Rafael;Mota, Leandro Henrique de Sousa;Gon?alves, Manoel Carlos;Viegas Neto, Antonio Luiz;Carlesso, André;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000400015
Abstract: the study aimed to estimate the parameters and the genetic gain in selection of half-sib for nitrogen use efficiency, through simultaneous selection of characters. two experiments were established, differentiated by nitrogen fertilization, one with proper fertilization (high n) and another in stress conditions (low n). the experiment was using a 10x10 lattice with two replications. in the tests we used 84 different half-sib and 16 witnesses. from the mean squares of analysis of variance in each environment were the estimates of genetic parameters. after the analysis were selected in each environment 17 different half-brothers, through the classical index selection, and verified the repeatability of the progeny in both environments. observed variability among progenies, determining the potential for population screening for nitrogen use efficiency. the parameter estimates and genetic gains were higher in high n the use of selection index promoted estimates of selection gain of 24.43 and 21.05% for high and low n, respectively, for grain yield. the progenies showed average yield of 13.45 and 19.47% higher than control in high and low n, respectively.
Malforma es Fetais em Gesta o Múltipla
Brizot Maria de Lourdes,Fujita Marisa Marie,Reis Nádia Stela Viegas dos,Banduki Neto Jorge Demétrio
Revista Brasileira de Ginecologia e Obstetrícia , 2000,
Abstract: Objetivos: demonstrar os tipos de malforma es em gesta es múltiplas assim como a influência da corionicidade nestes casos. Métodos: foram analisadas 169 gesta es múltiplas submetidas à avalia o ultra-sonográfica no Setor de Medicina Fetal da Clínica Obstetrícia do Hospital das Clínicas da Faculdade de Medicina da Universidade de S o Paulo no período de janeiro de 1997 a janeiro de 1999. A corionicidade foi definida por meio de ultra-sonografia no primeiro trimestre, presen a de placentas separadas, sexos diferentes ou exame anatomopatológico da placenta. Resultados: do total de gesta es, 24 apresentavam malforma es fetais (14,2%) sendo 22 em gesta es duplas e 2 em gesta es triplas. Das gesta es gemelares que apresentavam malforma es fetais, 13 eram monocori nicas, 4 dicori nicas e em 5 a corionicidade n o era conhecida. Os tipos de malforma es fetais foram aquelas associadas unicamente a gesta es múltiplas (gêmeos unidos, n = 5; gêmeo acárdico, n = 3) e as que também ocorrem em gesta es únicas. A idade gestacional do parto de fetos com anomalias foi menor em rela o aos sem anomalias. Conclus es: a maioria das malforma es congênitas ocorreu em gesta es monocori nicas. A determina o precoce do tipo de placenta o é útil no estabelecimento do prognóstico de gesta es gemelares, permitindo o planejamento das condutas em gesta es complicadas por anomalias congênitas.
Epidemiología molecular del virus sincicial respiratorio en pacientes pediátricos en un período de seis a?os
Viegas,Mariana;
Acta bioqu?-mica cl?-nica latinoamericana , 2011,
Abstract: human respiratory syncytial virus (hrsv) is the leading cause of acute lower respiratory tract infections (alri) in children. despite considerable efforts there is as yet no satisfactory vaccine available. in this work, nasopharyngeal aspirates taken from hospitalized children with alri were analyzed over six consecutive epidemic seasons (1999-2004). by rt-pcr, 353 positive samples for hrsv by direct immunofluorescence were subtypified. among them, 65.7% belonged to subtype a and 34.3% to subtype b. therefore, a phylogenetic analysis was performed using rflp and sequence analysis of the g-glycoprotein gene, the main neutralizing antigen. the results for a subtype, showed that there were two main restriction patterns (pa1 and pa2) and two genotypes (ga2 and ga5) cocirculating during the period studied. the phylodinamic analysis showed that there were some genetic clades which along this period of time alternated their circulation between argentina and other countries and that other clades cocirculated worldwide. the subtype b analysis enabled the description of an unusual genetic event such us a 60 nucleotide duplication. the phylodinamic analysis showed that all of these viruses, designated ba, circulated in our country during the period studied and were associated with strains reported wordlwide, showing a common ancestor which had probably been generated in a single genetic event between 1997 and 1999 in argentina. this work contributes to a better understandig of this virus evolution, giving a fundamental role to the virology laboratory in the active molecular surveillance.
Efeito inibidor de cárie dental de uma única aplica??o tópica de solu??o de fluofosfato acidulada em adultos jovens: experiência de um ano
Viegas,Yvette;
Revista de Saúde Pública , 1970, DOI: 10.1590/S0034-89101970000100009
Abstract: the purpose of this investigation was to verify whether the acid fluophosphate solutions would give in young adults similar results like the ones obtained in children. in this study one topical application of acid fluophosphate solution, ph approximately 3, with 1.23% of fluoride, was done in 75 students with an average of 20 years of age. the percentage of difference between the control hemiarchs and the experimental ones was 27.66%. this reduction in the incidence of dental caries was statistically significant.
Gesta??o e cárie dental
Viegas,Yvette;
Revista de Saúde Pública , 1970, DOI: 10.1590/S0034-89101970000100011
Abstract: the purpose of this investigation was to verify if the incidence of dental decay increases during pregnancy.in this study 82 pregnant and 40 nonpregnant women were included. in both groups the incidence of attacked surfaces was studied in a period of six months. the observed incidence of dental caries between the groups was not statistically significant.
Fluosilicato de zinco na preven??o de cárie dental em ratos
Viegas,Yvette;
Revista de Saúde Pública , 1967, DOI: 10.1590/S0034-89101967000100010
Abstract: the purpose of this research performed in rats (rattus norwegicus) was to observe if there is a synergic action of fluorine and zinc in order to obtain a greater reduction in dental caries. the study incolved three groups of rats receiving: a) zinc silicofluoride - 1 ppm, b) sodium fluoride - 1 ppm and c) tap water. all groups included males and females, and were divided in sub-groups in accordance with cariogenic and non cariogenic diets. the data were treated by analysis of variance and the main conclusions obtained were the following: 1st) the group of zinc silicofluoride has shown less caries than the sodium fluoride group, but the difference was not statistically significant. when both groups a and b were compared to group c, the results were significant. 2nd) the rats receiving zinc silicofluoride or sodium fluoride have shown higher levels of fluorine in the bone ashes but the difference between them was not statistically significant. 3rd) the rats of both groups - zinc silicofluoride and sodium fluoride - have shown bone demineralizantion at equal level.
Prevalência de cárie dental em Barretos, SP, Brasil, após dezesseis anos de fluoreta??o da água de abastecimento público
Viegas,Yvette; Viegas,Alfredo Reis;
Revista de Saúde Pública , 1988, DOI: 10.1590/S0034-89101988000100004
Abstract: data of baseline and sixteen year surveys of the prevalence of dental caries in children 5 to 14 years and adults of 15 to 24 in barretos (s. paulo state, brazil), were analysed to verify the reduction observed during the sixteen year period of water fluoridation. the reduction in the prevalence of dental caries observed is similar to those obtained in other studies in brazil and other countries. in the children 5 and 6 years old 66.1% were caries-free, in the age group 6 to 14 there was a reduction of 54% in the dmf average and the children of 12 years of age have a dmf of 3.5. in the individuals of 18 years of age 72.3% retained all their permanent teeth, and in the individuals of 15 to 24 years of age there was a reduction of 90.25% in the level of edentulousness.
Análise dos dados de prevalência de cárie dental na cidade de Barretos, SP, Brasil, depois de dez anos de fluoreta??o da água de abastecimento público
Viegas,Yvette; Viegas,Alfredo Reis;
Revista de Saúde Pública , 1985, DOI: 10.1590/S0034-89101985000400001
Abstract: data of baseline and ten-year surveys of the prevalence of dental caries in children 3 to 14 years old, and young adults of 14 to 19, in barretos (s. paulo state, brazil), were analysed to verify the reduction observed in caries in the primary and permanent teeth during the ten-year period of water fluoridation. the reduction in the prevalence of dental caries observed is similar to the ones obtained in the pilot studies in brazil and other countries. in the age group 7 to 10, 50% of children do not have any permanent teeth attacked by caries, and 51.6% in the group 3 to 5 are in the same condition as regards their primary teeth.
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