Identificação de genótipos de milho para tolerância à seca por análise multivariada.

The identification of genotypes that are tolerant to water deficit is crucial for the maintenance of the agricultural production. This study aimed to evaluate the genotypic variation for drought tolerance among corn genotypes by means of multivariate analysis, as well as to identify hybrids with high grain yield under conditions of water deficit and full irrigation. For this purpose, an experiment was conducted in a randomized block design, with 36 corn hybrids, being 34 experimental elite and two commercial (controls) hybrids, under water deficit and full irrigation, during the reproductive stage, with four replications. The irrigation levels, added to the rainfall, totaled 691.6 mm under full irrigation and 490.8 mm under water deficit

Optimisation of biomass production and nutritional value of two marine diatoms (Bacillariophyceae), Skeletonema costatum and Chaetoceros calcitrans

S. costatum and C. calcitrans are two cosmopolitan high-value centric diatoms, with a rich nutritional profile. The following work optimised the culture medium of S. costatum and C. calcitrans cultures, respectively, in a stepwise process as follows: 2.4 mM and 1.2 mM of silicate, 4 mM of nitrate, 100 µM of phosphate, 20 and 80 µM iron, and 0.5 mL L−1 of micronutrients. The results that were obtained revealed an increase in biomass productivity with a 1.8- and 3.2-fold increase in biomass that was produced by S. costatum and C. calcitrans, respectively. The biochemical profile showed an increase in high-value PUFAs such as 2.6-fold and 2.3-fold increase in EPA for S. costatum and C. calcitrans, respectively, whilst a 2.6-fold increase in DHA was detected in S. costatum cultures. The present work provides the basic tools for the industrial cultivation of S. costatum and C. calcitrans with enhanced productivity as well as improved biomass quality, two factors which are highly relevant for a more effective application of these diatoms to aquaculture and nutraceutical production.info:eu-repo/semantics/publishedVersio

Bicudo do algodoeiro: identificação, biologia, amostragem e táticas de controle.

bitstream/CNPA/18282/1/CIRTEC79.pd

Non-Commutative Correction to Thin Shell Collapse in Reissner Nordstro¨\ddot{o}m Geometry

This paper investigates the polytropic matter shell collapse in the non-commutative Reissner-Nordstr$\ddot{o}$m geometry. Using the Israel criteria, equation of motion for the polytropic matter shell is derived. In order to explore the physical aspects of this equation, the most general equation of state, $p=k{\rho}^{({1+\frac{1}{n}})}$, has been used for finite and infinite values of $n$. The effective potentials corresponding to the equation of motion have been used to explain different states of the matter shell collapse. The numerical solution of the equation of motion predicts collapse as well as expansion depending on the choice of initial data. Further, in order to include the non-commutative correction, we modify the matter components and re-formulate the equation of motion as well as the corresponding effective potentials by including non-commutative factor and charge parameter. It is concluded that charge reduces the velocity of the expanding or collapsing matter shell but does not bring the shell to static position. While the non-commutative factor with generic matter favors the formation of black hole.Comment: 18 pages,17 figure

Utilização de proteases vegetais na fabricação de queijos coalho com leite de cabra.

Na indústria alimentícia, as proteases têm encontrado diversas aplicações, algumas bastante tradicionais, a exemplo da quimosina, amplamente utilizada na fabricação de queijos. Entretanto, o aumento do consumo de queijos e a diminuição na disponibilidade de estômagos de bezerro lactentes têm ocasionado a demanda por coalhos alternativos como os de origem microbiana e animal, obtidos muitas vezes por manipulação genética. Produtos de ocorrência natural, como proteases extraídas de vegetais e destinadas à fabricação de queijos, apresentam a vantagem de serem mais facilmente aceitos pelos consumidores e aprovados para comercialização. Em estudos anteriores na Embrapa Caprinos e Ovinos, observou-se que sementes de girassol (Helianthus annus) apresentaram atividade coagulante no leite. Baseados nestes estudos realizaram-se novos experimentos com objetivo de avaliar o potencial da utilização de extratos das sementes de girassol na fabricação de queijos de leite de cabra. Para alcançar este objetivo, queijos foram fabricados com enzima tradicional (quimosina) e comparados com os fabricados com extratos de girassol, com base em eletroforeses e análises físico-químicas. Apresentando semelhança entre as características físico-químicas e eletroforéticas entre os dois processamentos, mostrando ser possível a fabricação de queijos fabricados a partir de extratos de sementes de girassol

Atividade microbiana do solo em diferentes sistemas de cultivo de manga no Vale do São Francisco.

O objetivo deste trabalho foi avaliar o impacto decorrente de diferentes sistemas de produção de manga no Submédio do Vale do São Francisco sobre a atividade microbiana do solo. As amostras foram coletadas em agosto de 2010 nas camadas de 0-10 cm e 10-20 cm em áreas com cultivo de manga, em Petrolina, PE e Juazeiro, BA. Foram estudadas áreas sob manejo: convencional, integrado e orgânico, tendo como referência áreas adjacentes de Caatinga remanescente. Determinouse o teor total de nutrientes, C e N do solo, biomassa microbiana e respiração basal, estimando-se os valores de quociente metabólico (qCO2) e quociente Microbiano (qMIC). Os resultados mostraram que as áreas de Caatinga remanescente apresentaram maior teor de carbono orgânico total, enquanto áreas sob manejo integrado e convencional apresentaram os maiores teores de N. Áreas com o cultivo orgânico apresentaram maior biomassa microbiana, enquanto as áreas sob manejo convencional apresentaram o maior valor de qCO2, indicando, neste caso, estado de desequilíbrio do solo neste sistema de produção

Amyotrophic lateral sclerosis: one or multiple causes?

The Amyotrophic lateral sclerosis (ALS) is the most common form of motor neuron disease in the adulthood, and it is characterized by rapid and progressive compromise of the upper and lower motor neurons. The majority of the cases of ALS are classified as sporadic and, until now, a specific cause for these cases still is unknown. To present the different hypotheses on the etiology of ALS. It was carried out a search in the databases: Bireme, Scielo and Pubmed, in the period of 1987 to 2011, using the following keywords: Amyotrophic lateral sclerosis, motor neuron disease, etiology, causes and epidemiology and its similar in Portuguese and Spanish. It did not have consensus as regards the etiology of ALS. Researches demonstrates evidences as regards intoxication by heavy metals, environmental and occupational causes, genetic mutations (superoxide dismutase 1), certain viral infections and the accomplishment of vigorous physical activity for the development of the disease. There is still no consensus regarding the involved factors in the etiology of ALS. In this way, new research about these etiologies are necessary, for a better approach of the patients, promoting preventive programs for the disease and improving the quality of life of the patients

Influência da região do palmito na indução da embriogênese somática de folhas imaturas de dendezeiro (Elaeis guineensis Jacq.).

O objetivo do trabalho foi avaliar a região do palmito mais responsiva à indução da embriogênese somática de folhas imaturas de dendezeiro