Galactic Nonlinear Dynamic Model

We develop a model for spiral galaxies based on a nonlinear realization of the Newtonian dynamics starting from the momentum and mass conservations in the phase space. The radial solution exhibits a rotation curve in qualitative accordance with the observational data.Comment: 6 pages, 1 figure. Talk given in the 7th Alexander Friedmann International Seminar, June 29 to July 5, 2008, Joao Pessoa, PB, Brazi

Deteriorações pós-colheita da uva.

Deterioriações físicas e patológicas; fatores que favorecem as deteriorações patológicas; deteriorações químicas; fisiológicas; manejo integrado das deteriorações pós colheita.bitstream/item/133220/1/ID-35888.pdfApostila apresentada no Curso sobre Técnicas para a Produção de Uvas de Mesa, 2001, Petrolina

Mucosal delivery of tuberculosis vaccines: a review of current approaches and challenges.

Introduction: Tuberculosis (TB) remains a major health threat and it is now clear that the current vaccine, BCG, is unable to arrest the global TB epidemic. A new vaccine is needed to either replace or boost BCG so that a better level of protection could be achieved. The route of entry of Mycobacterium tuberculosis, the causative organism, is via inhalation making TB primarily a respiratory disease. There is therefore good reason to hypothesize that a mucosally delivered vaccine against TB could be more effective than one delivered via the systemic route.Areas covered: This review summarizes the progress that has been made in the area of TB mucosal vaccines in the last few years. It highlights some of the strengths and shortcomings of the published evidence and aims to discuss immunological and practical considerations in the development of mucosal vaccines.Expert opinion: There is a growing body of evidence that the mucosal approach to vaccination against TB is feasible and should be pursued. However, further key studies are necessary to both improve our understanding of the protective immune mechanisms operating in the mucosa and the technical aspects of aerosolized delivery, before such a vaccine could become a feasible, deployable strategy

Produtividade de coqueiro-anão verde irrigado submetido a práticas agroecológicas de proteção do solo.

O presente trabalho tem por escopo avaliar o efeito das coberturas vegetais e dos volumes de irrigação nas variáveis de produção de coco (Cocos nucifera L),de variedade Nana, (número de folhas vivas, número de folhas mortas, número de frutos da folha 14, número de frutos colhidos, número de cachos colhidos, volume água fruto central, peso médio do fruto central), durante o período de um ano e meio após o inicio da aplicação dos tratamentos como alternativa para aumento da produtividade e redução do consumo de água . As plantas foram escolhidas em esquema blocos ao acaso com 03 repetições e 05 plantas úteis por parcela, sendo que, utilizou-se para testar a infl uencia da redução da irrigação em ralação a produção utilizando inicialmente 200 litros de água e reduzindo 25% dessa pra cada tratamento até a irrigação reduzida de 50 litros. Por sua vez para verifi car a manutenção da produção com redução da irrigação e o emprego de coberturas utilizou-se 100 e 50 litros de agua combinados com o emprego de revestimento morto (Mulche) disposta a 50% e a 100% da área do coroamento, aplicou-se também biomanta de fi bra integral posta naquelas proporções, visando observar o que melhor mantem a umidade do solo reduzindo assim a irrigação e garantindo melhoramento da produção e redução dos custos

Genetic divergence among Brazilian garlic cultivars based on morphological characters and AFLP markers.

This study aimed to evaluate the genetic diverity of 20 garlic cultivars by using morphological characters and amplified fragment length polymorphism (AFLP) markers to identify possible duplicate cultivars

Genetic parameters of agronomic characters in Panicum maximum hybrids.

This study was carried out with the objective of estimating the genetic parameters of agronomic traits in Panicum maximum hybrids. Genotypes obtained from the crosses between the sexual plants S10 and S12 and cultivars Tanzania and Mombasa were evaluated. The design was an incomplete blocks design with two replicates (clones) and 33 blocks. Each block was constituted by three lines or plots with nine plants each, which were evaluated in six harvests. All the characters presented low broad sense heritabilities for both the individual harvest and for the mean of harvests and a large difference between the heritability and the individual repeatability coefficient, which may be due to the high permanent environmental variance, mainly for forage dry matter and leaf dry matter. On the other hand, the percentage of leaves also presented low repeatability and permanent environmental variance. The genotypic coefficients of variation were high, except for leaf percentage, but they were also associated with high residual coefficients of variation. Both the broad sense heritabilities per harvest and for the mean of harvests were of moderate magnitude for the agronomic traits evaluated in hybrid individuals of P. maximum. On the other hand, there is variability for selection of important characters such as total and leaf dry matter yields and selection for leaf percentage needs a greater number of harvests to improve selection efficiency. The genotypes presented great variability for Bipolaris maydis leaf spot incidence and this character can be included in the P. maximum breeding program

Genetic parameters of agronomic characters in Panicum maximum hybrids.

This study was carried out with the objective of estimating the genetic parameters of agronomic traits in Panicum maximum hybrids. Genotypes obtained from the crosses between the sexual plants S10 and S12 and cultivars Tanzania and Mombasa were evaluated. The design was an incomplete blocks design with two replicates (clones) and 33 blocks. Each block was constituted by three lines or plots with nine plants each, which were evaluated in six harvests. All the characters presented low broad sense heritabilities for both the individual harvest and for the mean of harvests and a large difference between the heritability and the individual repeatability coefficient, which may be due to the high permanent environmental variance, mainly for forage dry matter and leaf dry matter. On the other hand, the percentage of leaves also presented low repeatability and permanent environmental variance. The genotypic coefficients of variation were high, except for leaf percentage, but they were also associated with high residual coefficients of variation. Both the broad sense heritabilities per harvest and for the mean of harvests were of moderate magnitude for the agronomic traits evaluated in hybrid individuals of P. maximum. On the other hand, there is variability for selection of important characters such as total and leaf dry matter yields and selection for leaf percentage needs a greater number of harvests to improve selection efficiency. The genotypes presented great variability for Bipolaris maydis leaf spot incidence and this character can be included in the P. maximum breeding program