Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 13 )

2019 ( 197 )

2018 ( 327 )

2017 ( 337 )

Custom range...

Search Results: 1 - 10 of 184957 matches for " Maurílio Fernandes de;Alvarenga "
All listed articles are free for downloading (OA Articles)
Page 1 /184957
Display every page Item
Efeito da palha e da mistura atrazine e metolachlor no controle de plantas daninhas na cultura do milho, em sistema de plantio direto
Oliveira, Maurílio Fernandes de;Alvarenga, Ramon Costa;Oliveira, Ant?nio Carlos de;Cruz, José Carlos;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000100005
Abstract: the objective of this work was to study the effect of corn plant residue and mixture of atrazine plus metolachlor on weed control in no-till corn system. this experiment was performed in an oxisol, and the weed desiccation was done using glyphosate, 15 days before planting. the experimental design was a randomized block, with three replications. before corn planting, five levels of corn plant residues (0, 3, 6, 9 e 12tha-1) were equally distributed in the plots. two treatments were applied in subplots after corn planting: one without herbicide and the other one using the commercial mixture of atrazine plus metolachlor (1,200+ 1,800gha-1). different weed species were evaluated, at 26 and 41 days after planting. the total grass weeds number was significantly affected by the plant residue levels, independently of herbicide treatments and of evaluation period. the herbicide did not show a significant effect in the first evaluation period. however, in the second evaluation period, the herbicide reduced about 53% the total number of weeds compared to the plots without herbicide. it was verified that in the herbicide absence the total population of weeds were significantly higher in the second evaluation period. however, in the herbicide presence there was no significant difference in the total population of weeds between the two evaluated periods.
Efeito da palha e da mistura atrazine e metolachlor no controle de plantas daninhas na cultura do milho, em sistema de plantio direto
Oliveira Maurílio Fernandes de,Alvarenga Ramon Costa,Oliveira Ant?nio Carlos de,Cruz José Carlos
Pesquisa Agropecuária Brasileira , 2001,
Abstract: O objetivo deste trabalho foi estudar o efeito de níveis de palha de milho e da mistura formulada atrazine e metolachlor no controle de plantas daninhas na cultura de milho, em sistema de plantio direto. O ensaio foi realizado num Latossolo Vermelho distrófico, argiloso, fase cerrado, sendo a desseca o do mato feita com glyphosate, 15 dias antes do plantio. O delineamento experimental utilizado foi o de blocos ao acaso, com parcelas subdivididas e com três repeti es. Antes do plantio do milho, distribuíram-se cinco níveis de palha de milho (0, 3, 6, 9 e 12 tha-1), nas parcelas, de modo uniforme. Nas subparcelas, após o plantio, foram considerados dois tratamentos referentes a herbicida: ausência de herbicida ou a dose de 6,0 Lha-1 de atrazine, e metolachlor (1.200+ 1.800gha-1). Avaliou-se o número das plantas daninhas, por espécie, aos 26 e 41 dias após o plantio. O número total de plantas daninhas foi reduzido significativamente pelos níveis de palha, independentemente da presen a do herbicida e da época de avalia o. O herbicida n o apresentou efeito significativo na primeira época de avalia o; entretanto, na segunda, a redu o no número total de plantas daninhas foi de, aproximadamente, 53% em rela o às parcelas que n o o receberam. A popula o total de planta daninha foi significativamente superior na segunda avalia o, na ausência do herbicida. Na presen a do herbicida, n o houve diferen a significativa na popula o total de invasoras entre as duas épocas de avalia o.
Imazaquin sorption in surface and subsurface soil samples
Oliveira, Maurílio Fernandes de;Prates,lio Teixeira;Santanna, Derli Prudente;Oliveira Júnior, Rubem Silvério de;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000300013
Abstract: the objective of this work was to study the sorption and desorption of imazaquin, in surface and subsurface soil samples from brazil. sorption and desorption steps were carried out using batch equilibration and high performance liquid chromatography analytical routines. the value of kf,ads was positively correlated with clay content, and negatively correlated with ph of supernatant. samples from typic haplustox, clayey soil profile having high clay content, provided higher kf,ads values, and negative correlation with organic carbon, silt content, cation exchange capacity and ph.
Estabilidade físico-química, microbiológica e sensorial de carne ovina embalada a vácuo estocada sob refrigera??o
Fernandes, Rafaella de Paula Paseto;Freire, Maria Teresa de Alvarenga;Guerra, Carlos Cirelli;Carrer, Celso da Costa;Balieiro,lio Cesar de Carvalho;Trindade, Marco Antonio;
Ciência Rural , 2012, DOI: 10.1590/S0103-84782012000400025
Abstract: lamb is commercialized today almost entirely in frozen form, but, considering the current trend to greater demand for convenience products, it becomes more evident the need of availability of chilled cuts of meat in the market. the objective of this study was to evaluate the stability and safety of lamb meat packed under vacuum when stored under refrigeration. the lamb meat samples were packed in high barrier multilayer plastic films and stored under refrigeration (4±1°c). the stability was evaluated by means of physical and chemical analysis (lipid oxidation, objective color, ph value, chemical composition, cooking losses and instrumental texture), microbiological analysis (total count of psychrotrophic anaerobic, coliform count at 45°c, coagulase-positive staphylococci and the presence of salmonella) and sensory analysis (color, flavor and overall appearance). the vacuum packed lamb meat remained stable as to most physical and chemical indexes and microbiological indexes showed good stability throughout the 28 days of storage according to brazilian legislation standards to pathogenic microorganisms. in relation to the stability evaluation of chilled sheep loin, it was detected a high increase of counts for psychrotrophic anaerobic microorganisms, reaching around 107cfu g-1 sample at 14 days storage, but the pannelists did not detect significant sensory changes during all the period. it is concluded that the shelf life of sheep loin stored at 4°c, is at least, 28 days.
Sor??o do herbicida imazaquin em Latossolo sob plantio direto e convencional
Oliveira, Maurílio Fernandes de;Colonna, Ignácio;Prates,lio Teixeira;Mantovani, Evandro Chartuni;Gomide, Reinaldo Lúcio;Oliveira Júnior, Rubem Silvério de;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000800009
Abstract: the objective of this study was to evaluate the effect of spatial variation of ph and organic matter of a dark red soil, under different managements, on imazaquin herbicide sorption. soil-water sorption partitioning coefficient (kd) was used in surface soil samples collected at 0-15 cm layer in a 38 ha area, under central pivot irrigation and with till and no-till management. herbicide sorption was most strongly related to soil organic matter content and ph, revealing greatest sorption in lower ph values with greater soil organic matter content. these samples were collected at no-till management area. the ph effects on imazaquin retention occur either by controlling the organic matter ionization form as also its speciation. the clay content in the whole area had no variation, however, it didn't affect the kd values. using multivariate regression and two independent variables (soil organic matter content and ph), the prediction of herbicide sorption by soil was good (r2 = 0.91).
Bone histomorphometry of broilers submitted to different phosphorus sources in growing and finisher rations
Oliveira, Rafael Carvalho de;Costa, Luciano da Fontoura;Fernandes, Evandro Abreu;Alvarenga, Bauer Oliveira e;Matioli, Sérgio Russo;Beletti, Marcelo Emílio;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006001000009
Abstract: the objective of this work was to identify alterations in the histomorphology of the cortical bone tissue of broilers submitted to growing and finisher rations formulated with five different sources of phosphorus: dicalcium phosphate, simple superphosphate, triple superphosphate, monoammonium phosphate and araxá rock phosphate. histological images had their components segmented, and were called regions of interest (roi). images were analyzed through developed algorithms, using the scilab mathematical environment. eleven features were considered in order to obtain a complete description of the bone images: percentage of bone by area, roi area, roi perimeters, roi elongation, roi angle and their respective standard deviations, besides entropy of roi angles and a texture-oriented measure (lacunarity). the substitution of dicalcium phosphate in growing and finisher rations for any other tested source of phosphorus caused significant changes on the hystomorphology of the cortical broilers bones, for example: diminution of bone percentage by area, increase of lacuna area and worse matrix homogeneity. changes were more pronounced in the araxá rock phosphate treatments, with the highest fluorine content, than in simple superphosphate, triple superphosphate and monoammonium phosphate treatments, which were similar.
Development of a transformation system for Penicillium brevicompactum based on the Fusarium oxysporum nitrate reductase gene
Varavallo, Maurílio Ant?nio;Queiroz, Marisa Vieira de;Pereira, Jorge Fernando;Ribeiro, Ronney Adriano;Soares, Marcos Ant?nio;Ribeiro, Jo?o Batista;Araújo, Elza Fernandes de;
Brazilian Journal of Microbiology , 2005, DOI: 10.1590/S1517-83822005000200015
Abstract: penicillium brevicompactum is a filamentous fungus that presents a potential for industrial use due its efficient pectinase production. a heterologous transformation system was developed for p. brevicompactum based on the complementation of a nitrate reductase mutant. nitrate reductase mutants were obtained by resistance to chlorate in a rate of 23.24% when compared to other mutations that lead to the chlorate resistance. one mutant named 4457-18x was chosen for the transformation experiments with the pnh24 vector containing de fusarium oxysporum nitrate reductase gene. a frequency of approximately 3 transformants/μg dna was obtained using the circular vector pnh24. this frequency was multiplied about 10 fold using the linearized vector with the xba i restriction enzyme. southern analysis of the transformants showed a tendency of the linearized vector to diminish the number of integrations compared to the use of the circular vector. the integration was random and stable in the analyzed transformants. the establishment of a transformation system for p. brevicompactum is fundamental for genetic manipulation of this microorganism.
Lipoxigenases e teor de ácido linolênico relacionados à qualidade de sementes de soja
Oliveira, Dario Alves de;Piovesan, Newton Deniz;José, Inês Chamel;Barros, Everaldo Gon?alves de;Dias, Denise Cunha Fernandes dos Santos;Moreira, Maurílio Alves;
Revista Brasileira de Sementes , 2006, DOI: 10.1590/S0101-31222006000100005
Abstract: the fatty acid content of soybean seeds has not been considered when evaluating the quality of seeds in research work carried out so far. the objective was to determine the effects of absence of lipoxygenases and low linolenic acid content on seed quality after delayed harvest. four different bulks were constructed: (a) seeds with lipoxygenase and normal linolenic acid content; (b) seeds with lipoxygenase and low linolenic acid content; (c) seeds without lipoxygenase and normal linolenic acid content and (d) seeds without lipoxygenase and low linolenic acid content. f5 seeds were harvested at the r8 stage and 10, 20 and 30 days after r8 stage. seed physiological quality was evaluated by the standard germination test, accelerated aging test and emergence speed index. seeds with low linolenic acid content presented higher seed quality as measured by the accelerated aging test. seeds with lipoxygenase showed higher vigor as compared to those lacking these isozymes as determined by the emergence speed index.
Teste rápido de condutividade elétrica e correla??o com outros testes de vigor
Carvalho, Luzineide F. de;Sediyama, Carlos Sigueyuki;Dias, Denise Cunha Fernandes dos Santos;Reis, Múcio Silva;Moreira, Maurílio Alves;
Revista Brasileira de Sementes , 2009, DOI: 10.1590/S0101-31222009000100027
Abstract: the objective of this study was to estimate the correlation between the results of the electric conductivity test carried out with different temperatures and soaking periods and other tests that estimate seed physiological quality. soybean seeds were harvested at the r8 stage and 15, 30 and 45 days after r8, in the 2001/2002 and 2002/2003 growing seasons. seed quality was evaluated by the germination, first germination count, accelerated aging, sand bed emergence and electric conductivity tests. in addition to the traditional electric conductivity test, at 25oc for 24 hours, other methodologies were evaluated, using 20 subsamples of 10 seeds kept at 32oc or 40oc for 10, 30, 60 and 120 minutes. the studied methodologies correlated well with the traditional methodology, as well as with the other tests evaluated and the 120-min period, at both temperatures, correlated best with the other evaluated tests, being equivalent to the 24-h period.
Retardamento de colheita como método de diferencia??o de genótipos de soja para qualidade de sementes
Lima, Wanderlei Ant?nio Alves de;Borém, Aluízio;Dias, Denise Cunha Fernandes Santos;Moreira, Maurílio Alves;Dias, Luiz Ant?nio dos Santos;Piovesan, Neuton Deniz;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000100026
Abstract: the experiment was carried out with the objective of evaluating the effect of harvest delay on the differentiation of seed quality in soybean. four different genotypes were utilized: lox-linb (seeds without lipoxygenase and low linolenic acid content); lox+linn (seeds with lipoxygenase and normal linolenic acid content); lox-linn (seeds without lipoxygenase and normal linolenic acid content) and lox+linb (seeds with lipoxygenase and low linolenic acid content). the seeds were harvested at the r8 stage, and at r8+15 days and r8+30 days. seed physiological quality was evaluated by germination, accelerated aging, germination speed, electric conductivity and seedling emergence tests. it was concluded that: the delayed harvest from r8+15 days was efficient to differentiate genotypes for seed physiological quality. genotypes without lipoxygenase showed higher seed physiological quality than genotypes with lipoxygenase.
Page 1 /184957
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.