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Search Results: 1 - 10 of 77994 matches for " José Amauri;Torres "
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Shoot tip culture and thermotherapy for recovering virus-free plants of garlic
Torres, Antonio Carlos;Fajardo, Thor Vinícius;Dusi, André Nepomuceno;Resende, Renato de Oliveira;Buso, José Amauri;
Horticultura Brasileira , 2000, DOI: 10.1590/S0102-05362000000300010
Abstract: garlic shoot tip culture associated with dry heat thermotherapy (cloves exposed to 37°c for 35 days) were essential for recovering virus free plants of the cv amarante. in this condition 70% of the explants developed in vitro and produced plants. a total of 77% of those plants was virus free when indexed by isem, which resulted in a final index of 54% of virus free plants from treated cloves. the percentage of regeneration decreased to 20% as the temperature increased up to 40°c. however 90% of those plants were virus free, leading to a final index of 18% virus free plants out of treated cloves.
Detection of three Allexivirus species infecting garlic in Brazil
Melo Filho, Péricles de Albuquerque;Nagata, Tatsuya;Dusi, André Nepomuceno;Buso, José Amauri;Torres, Antonio Carlos;Eiras, Marcelo;Resende, Renato de Oliveira;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000800002
Abstract: garlic viruses often occur in mixed infections under field conditions. in this study, garlic samples collected in three geographical areas of brazil were tested by dot-elisa for the detection of allexiviruses using monoclonal specific antibodies to detect garlic virus a (garv-a), garlic virus b (garv-b), garlic virus c (garv-c) and a polyclonal antiserum able to detect the three virus species mentioned plus garlic virus d (garv-d). the detected viruses were biologically isolated by successive passages through chenopodium quinoa. reverse transcriptase polimerase chain reaction (rt-pcr) was performed using primers designed from specific regions of the coat protein genes of japanese allexiviruses available in the genetic bank of national center of biotechnology information (ncbi). by these procedures, individual garlic virus genomes were isolated and sequenced. the nucleotide and amino acid sequence analysis and the one with serological data revealed the presence of three distinct allexiviruses garv-c, garv-d and a recently described allexivirus, named garlic mite-borne filamentous virus (garmbfv), in brazil.
Levantamento preliminar de ra?as de Sphaerotheca fuliginea no Brasil
Reis, Ailton;Buso, José Amauri;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000300026
Abstract: sphaerotheca fuliginea is the causal agent of powdery mildew, one of the most important cucurbit diseases in brazil. disease control is achieved by using fungicides, but resistant varieties of cultivars can also be used. this fungus presents physiological specificity in melons with race 1 being apparently prevalent in brazil and world wide. knowledge of prevalent races of the pathogen in a specific region is of vital importance to plant breeders. in this research a total of 31 isolates was obtained from different cucurbit species, showing symptoms of powdery mildew, cultivated in several brazilian states. all isolates were identified as s. fuliginea. isolates were maintained on plants growing in the greenhouse and evaluated for virulence on a set of differential melon and one watermelon cultivars. twenty-one isolates were identified as race 1, and eight as race 2. two isolates from watermelon were considered specific to this species because they infected only the cultivar "crimson sweet" of watermelon. race 1 is the most prevalent in brazil and race 2 is present in the federal district. race 2 seems to be adapted to greenhouse conditions as the isolates from this race were found only under this specific condition. this is the first report of race 2 of s. fuliginea in the federal district of brazil.
Avalia??o genética de bovinos da ra?a holandesa usando a produ??o de leite no dia do controle
Ferreira, William José;Teixeira, Nilson Milagres;Euclydes, Ricardo Frederico;Verneque, Rui da Silva;Lopes, Paulo Sávio;Torres, Robledo de Almeida;Wenceslau, Amauri Arias;Silva, Marcos Vinícius Gualberto Barbosa da;Magalh?es Júnior, Márcio Nery;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000200007
Abstract: 153,963 test day milk yield records and 13,273 first lactations of holstein cows calving between 1989 and 1998, were used with the objective of estimating genetic, phenotypic and environmental parameters for test day milk yield (pldc) and 305 day milk yield (p305) and to study the convenience of using test day yields in genetic evaluations to replace p305. four models were used. models 1 and 2 differed according contemporary grouping and monthly milk records were considered as repeated measures. in model 1 (pldcm01) records were grouped by herd-year-season of test day yield and in model 2 (pldcm02) by herd-year-season of calving. in a third (model 3), monthly yield records were analyzed as individual traits (c01 to c10); and the fourth (model 4) was the traditional 305-day model. restricted maximum likelihood methodology was used with the mtdfreml system. the estimates of heritability for pldc, using model 1, model 2 and for p305 were 0.27, 0.15 and 0.25, respectively. heritabilities for monthly milk records ranged from 0.11+0.02 (c01) to 0.21+0.03 (c08), with the largest values occurring beginning in the fourth month. genetic correlation estimates between monthly records and p305 ranged from 0.76 to 1.00, with the highest correlations occurring in the middle lactation. it was concluded that using test day milk yield is promising and that selecting for middle lactation records could have advantages over 305-day milk yield.
Positive Impact of Utilizing More Formative Assessment over Summative Assessment in the EFL/ESL Classroom  [PDF]
José O. Torres
Open Journal of Modern Linguistics (OJML) , 2019, DOI: 10.4236/ojml.2019.91001
Abstract: Numerous studies about the role of assessment in English as a Foreign Language (EFL) and English as a Second Language (ESL) have been conducted in the last few decades. These studies describe a close connection between language assessment and language teaching. Evidence shows that the way students perceive their results after taking an exam strongly influences their motivation toward using the target language in real communication (Torrance, 2012). In compliance with such studies, this paper provides a general view of language assessment and its implications in the EFL/ESL classroom. The paper aims to provide a general background of language assessment, as well as a contrastive analysis of both summative and formative assessment. The paper approaches the topic from the point of view of both agents involved in the learning process; instructors and students. The findings suggest that students benefit more from formative assessment since it provides them with timely appropriate feedback that helps them shape the way they approach language learning (Huang, 2016). On the other hand, the study highlights that novice teachers usually opt for the traditional summative assessment in order to avoid challenges that formative assessment represents.
Matéria seca e altura das plantas de soja e arroz em fun??o do grau de compacta??o e do teor de água de dois latossolos
Beutler, Amauri N.;Centurion, José F.;
Engenharia Agrícola , 2004, DOI: 10.1590/S0100-69162004000100016
Abstract: this research was carried out to evaluate the height of plants and production of aerial and root dry matter of soybean and rice in two water contents (water content at tension 0.05 and 0.01 mpa) and three levels of resistance to penetration (between 0.25 and 6.46 mpa) determined with penetrometer dinamometric ring. samples of haplustox and eutrustox, medium and clayey texture were collected in depth of 0.0-0.20 m and compact in layers of 0.03 m in pots of 0.20 m of height and 0.25 m of diameter. the height of plants was reduced in values of penetration resistance greater of 3.0 mpa. the smaller production of aerial part dry matter of the plants occurred in penetration resistance of 3.76 and 3.37 mpa for soybean; 3.93 and 3.37 mpa for rice, in haplustox and eutrustox, respectively, in the water content in tension of 0.05 mpa, and in the greater water content only occurred reduction of root dry matter.
Study of the nature of non-metallic inclusions in samples of aluminum and silicon killed low carbon steels, collected in the refining treatment and continuous casting stages
Pires, José Carlos Santos;Garcia, Amauri;
Materials Research , 2004, DOI: 10.1590/S1516-14392004000400002
Abstract: the amount, distribution, size and chemical composition of non-metallic inclusions have a direct influence on steel properties. by controlling size and chemical composition of these inclusions, it is possible to get a product with good quality. the identification of the nature and the control of inclusion formation are very important for steel cleanness. the behavior of these inclusions is predictable, in some extent, by the determination of the chemical composition of non-metallic phases that form such inclusions. with the objective of studying the chemical composition, the size and the distribution of such inclusions, samples of aluminum and silicon killed low carbon steels were collected in a national steel industry in the secondary refining and continuous casting stages. these samples were analyzed in the scanning electron microscope (sem) coupled to an energy dispersive analysis system (eds). from the results, it was possible to evaluate the nature of inclusions and to analyze the effectiveness of the refining process in the reduction of the number and area fraction of the inclusions. it was also possible to verify that the inclusions that remained after treatment, are less damage both to the steel properties as to the continuous casting process (clogging of the submerged valve).
Resistência à penetra??o em latossolos: valor limitante à produtividade de arroz de sequeiro
Beutler, Amauri Nelson;Centurion, José Frederico;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000600019
Abstract: the objetive of this work was to evaluate the value of resistance to penetration limit to dry land rice yield (oryza sativa cv. iac 165) grown in soil with water content at tension of 0.05 and 0.01mpa. soil was sampled at 0.00-0.20m depth in haplustox, medium texture (lvd) and eutrustox, clayey (lvef) and compacted in layers of 0.03m in pots of 0.20m height and 0.25m diameter (0.00982m3). the values of resistance to penetration were measured by dinamometric ring penetrometer. the experiment was complete randomized, in a 4 x 2 factorial, with 3 replications. for the water content at tension of 0.01mpa, the value of resistance to penetration limit to dry land rice yield was 2.38 and 2.07mpa, respectively, for lvd and lvef. higher rice yield was obtained in smaller value of resistance to penetration in water content at tension of 0.05mpa. the dry land rice was less productive in soil with water content at tension of 0.05mpa.
Compacta??o do solo no desenvolvimento radicular e na produtividade da soja
Beulter, Amauri Nelson;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000600010
Abstract: in compacted soils, changes in the distribution of plant root system occur in depth. the objective of this study was to evaluate the compaction effect in soybean root development and yield in an oxisol. the treatments were 0, 1, 2, 4 and 6 passed of a 11 mg tractor, side, by side, on soil surface. the experimental design was a completely randomized, with four replications. in december, 2002, soybean (glycine max cv. embrapa 48) was sown, and after that, the samples were collected in layers of 0.02-0.05, 0.07-0.10 and 0.15-0.18 m, for physical determinations. in r6 stadium, samples of 0.10 m in line x 0.20 m between lines, in layers of 0.0-0.05, 0.05-0.10, 0.10-0.15 and 0.15-0.20 m were collected. soybean yield was evaluated in plots of 3.6 m2. the increase in compaction increased the root density and the root dry matter in layer of 0.0-0.05 m and caused linear decrease in the most compacted layers of 0.05-0.10 and 0.10-0.15 m. from the decrease of 18% of root density, in resistance to penetration of 0.85 mpa, in the depth of 0.05-0.15 m, there was reduction in soybean yield. soil compaction promoted modifications in the distribution of the soybean root system.
Efeito do conteúdo de água e da compacta??o do solo na produ??o de soja
Beutler, Amauri Nelson;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000700009
Abstract: soil compaction has been limiting physical factor to plants growth. this work aimed to evaluate the production of soybean (glycine max cv. embrapa 48) as affected by water content and soil compaction. the experimental design was completely randomized, in a factorial scheme 4x2, i.e., four levels of resistance to penetration (between 0.27 and 4.32 mpa) and two levels of soil water retention (0.05 and 0.01 mpa). samples of red latossol medium texture and red latossol clayey were collected in 020 cm depth, sieved in mesh of 0.4 cm and compacted in layers of 3 cm in pots of 20 cm height and 25 cm of diameter (9.82 l). the levels of resistance to penetration were determined with dynamometric ring penetrometer. the critical level of soil resistance to penetration, in relation to grains production, was 1.66 and 2.22 mpa, in red latossol medium texture, and 3.05 and 2.81 mpa, in red latossol clayey, for the water content in tension of 0.05 and 0.01 mpa, respectively. the higher grains production was obtained in tension of 0.01 mpa. soybean production is affected by levels of soil resistance to penetration superior to 2 mpa in latossols under tension of 0.01 mpa.
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