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Search Results: 1 - 10 of 97177 matches for " Moita Ant?nio W. "
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Produ??o comercializável e teores de Cu e Zn em cenoura em decorrência da a??o residual de fósforo e composto de lixo em solo sob cerrado
Mesquita Filho, Manoel V. de;Souza, Antnio F.;Moita, Antnio W.;Ramagem, Ricardo D.;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200006
Abstract: a field experiment was conducted on a clayey yellow red oxisol to evaluate the residual effect of the application of phosphorus and urban waste compost of the previous two years on the root production of carrot cv. brasília. the soil of the previous experiment design used a factorial consisting of three levels of phosphorus (0; 400 and 800 kg ha-1), applied as triple superphosphate combined with five levels of urban waste compost (0; 20; 40; 60 and 80 t.ha-1), was arranged in randomized complete blocks with three replicates. carrot plants were harvested 90 days after planting. after the harvest, a linear and quadratic effect for phosphorus and urban waste compost (p<0,01) was observed. the linear interaction p x quadratic urban compost was highly significant (p<0,01). the maximum root total production was 26.5 t.ha-1 corresponding to 18.5 t ha-1 of marketable yield, estimated by the calculated doses of 762.5 kg ha-1 of p2o5 and 53.2 t ha-1 of urban waste compost according to the function: y(prod) = 4.541143 + 4.0088 x 10-2 p2o5 + 2.50486 x 10-1 clx - 2.5619 x 10-5 (p2o5)2 - 1.9125 x 10-5 (clx * p2o5) - 2.216 x 10-3 clx2 (r2 = 0,96), where clx = urban waste compost. doses of urban waste compost applied to the soil, affected the values of ph, electric conductivity, and the available contents of cu and zn. even under the highest levels of phosphorus and urban waste compost applied in the experiment, no phytotoxic effect on carrot plants was observed, and in the edible part, none of the elements reached the maximum tolerant limit for food, as established by the brazilian legislation.
Produ o comercializável e teores de Cu e Zn em cenoura em decorrência da a o residual de fósforo e composto de lixo em solo sob cerrado
Mesquita Filho Manoel V. de,Souza Antnio F.,Moita Antnio W.,Ramagem Ricardo D.
Horticultura Brasileira , 2002,
Abstract: Realizou-se em 1997, em condi es de campo um experimento em Latossolo Vermelho Escuro distrófico argiloso sob cerrado de Brasília, para avaliar o efeito residual das aplica es em anos anteriores, a lan o de doses de fósforo (superfosfato triplo), e de composto de lixo na produ o de cenoura (Daucus carota), cv. Brasília, assim como nos teores de cobre e zinco em raízes frescas. Aproveitou-se o mesmo delineamento experimental de blocos ao acaso com 3 repeti es, no mesmo campo experimental dos experimentos anteriores distribuídos num esquema fatorial 3 x 5 incluindo-se 3 níveis de fósforo (0; 400 e 800 kg ha-1 de P2O5) e 5 níveis de composto de lixo (0; 20; 40; 60 e 80 t ha-1). A colheita foi realizada aos 90 dias após o plantio. A análise estatística dos dados de produ o total de raízes revelou efeito residual da aduba o dos últimos dois anos em linear e quadrático altamente significativo (p<0,01) para fósforo e composto de lixo. A intera o linear de P x quadrática composto de lixo foi altamente significativa (p<0,01). A produ o total máxima de 26,5 t ha-1, correspondendo a 18,5 t ha-1 de raízes comercializáveis, foi assegurada pelas doses calculadas de 762,5 kg ha-1 de P2O5 e 53,2 t ha-1 de composto de lixo de acordo com a fun o Y(PROD) = 4,541143 + 4,0088 x 10-2 P2O5 + 2,50486 x 10-1 CLx - 2,5619 x 10-5 (P2O5)2 - 1,9125 x 10-5 (CLx * P2O5) - 2,216 x 10-3 CLx2 (R2 = 0,96), onde CLx = composto de lixo. A aplica o ao solo das doses de composto de lixo alteraram o pH, a condutividade elétrica e os teores de Cu e Zn. Mesmo nas doses mais elevadas de fósforo e de composto de lixo aplicadas n o foram observados efeitos fitotóxicos de Cu ou de Zn. Os teores desses elementos em raízes in natura estiveram abaixo dos permitidos pela legisla o brasileira de alimentos.
Microbial Attributes of Infested Soil Suppressive to Bacterial Wilt by Bokashi Amendments  [PDF]
Mariana R. Fontenelle, Carlos A. Lopes, Carlos E. P. Lima, Daiane C. Soares, Luciana R. B. Silva, Daniel B. Zandonadi, Ronessa B. Souza, Antnio W. Moita
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.610119
Abstract: Bacterial wilt, caused by Ralstonia solanacearum, is a major tomato disease in tropical and sub-tropical regions. It is difficult to be managed, since no single measure confers significant contribution for disease control. Among the cultural practices available for disease management, bokashi provides nutrients to the plants, increasing the microbial biomass, improving the quality of the soil and, in some cases, protecting plants against diseases. In this work, we evaluated the effect of three different bokashis (Embrapa—BE; poultry—BP and cattle—BC) in two soils artificially and naturally infested with R. solanacearum, on the suppression of bacterial wilt in tomato. Disease control is discussed upon measurements on the contents of microbial biomass carbon (MBC), on total organic carbon (TOC), on basal respiration (BR), on metabolic coefficient (qCO2) and on microbial coefficient (qMIC). The experiment was implemented in greenhouse, with completely randomized design and factorial arrangement of treatments 2 × 3 (two soils × three bokashis). Disease suppression, assessed through wilt incidence 20 and 30 days after transplanting, was better observed in the naturally infested soil, where BP and BE were more efficient in controling the disease. TOC contents were higher in the artificially infested soil compared to that naturally infested, whereas the qMIC presented higher value for the naturally infested soil, which had greater contribution of MBC. Higher rates of BR and qCO2 were observed for the naturally infested soil with BC, probably indicating high plant stress caused by the disease in this treatment. Moreover, a high and positive correlation coefficient was found between the variables qCO2 and the number of infected plants at 30 days after transplanting. In the artificially infested soil, a negative correlation was found between the number of infected plants at 20 days after transplanting and TOC.
Host status of different crops for Meloidogyne ethiopica control
Lima, Edriana A.;Mattos, Jean K.;Moita, Antnio W.;Carneiro, Rui Gomes;Carneiro, Regina M.D.G.;
Tropical Plant Pathology , 2009, DOI: 10.1590/S1982-56762009000300003
Abstract: two greenhouse experiments were carried out to characterize the resistance or susceptibility reactions of 52 species of plants to meloidogyne ethiopica and their possible adverse effect on nematode population under greenhouse conditions. tested plants with reproduction factor less than one (rf<1.0) were rated as non-hosts or resistant, including: peanut (arachis hypogaea) 'cavalo vermelho', forage pigeon peas (cajanus cajan) 'iapar 43'and 'ppi 832', crotalaria grantiana, c. apioclice, c. spectabilis, dwarf velvet bean (mucuna deeringiana), castor bean (ricinus communis) 'iac 80', sorghum (sorghum bicolor) 'sara', cowpea (vigna unguiculata) 'espace 10' and 'australian', black oat (avena strigosa) 'iapar' 61', ryegrass (lolium multiflorum) 'italian', forage radish (raphanus sativus var. oleiferus) ipr116' and rye (secale cereale) 'ipr 69'. the first 11 are summer plants and the last four winter plants. the other 37 species/cultivars tested were good hosts or susceptible. some crop succession systems alternating summer and winter non-host plants are suggested for field experiments to validate these greenhouse results.
Principais características da raiz de cenoura na perspectiva de agentes da cadeia produtiva
Onoyama, Silvia S;Silva, Giovani Olegario da;Moita, Antnio W;Vieira, Jairo V;Lopes, Carlos Alberto;Souza, Geraldo da S e;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000300022
Abstract: the present investigation aimed at elucidating the carrot attributes which stake holders view as the most important. a research was carried out with carrot growers, seed companies, supplier salespersons, washers, food processors, wholesalers and supermarket managers and was compared to the perception of consumers from supermarkets located in the federal district of brazil. data sets were collected through structured interviews with closed questions about the importance of a range of attributes on a 1 (not important) to 5 (very important) scale. statistic method based on categorical analysis was used to rank the attributes and calculate the average contrasts. the survey indicated that, according to consumers, nutritional value, texture, external color and taste are the most important attributes. in contrast, the other stake holders pay more attention to characteristics related to shape uniformity, external color and green shoulder. in addition, differences of perception by specific chain agents were detected, in special to the consumers group, affected by gender, age, educational level, marital status and supermarket location. these results are very important for directing carrot research projects, which must meet the productive sector and consumers requirements.
Detec??o por sorologia do Melon yellowing associated virus (MYaV) em áreas produtoras de mel?o no Nordeste brasileiro
Lima, Mirtes F;Nagata, Tatsuya;Neves, Filipe M;Inoue-Nagata, Alice K;Moita, Antnio W;Sousa, Carla;Vecchia, Marília Della;Rangel, Maurício G;Dias, Rita de CS;Dutra, Luiza S;ávila, Antnio C de;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000400013
Abstract: the northeast region of brazil is the main melon-producing region of the country, being responsible for more than 90% of the total national production. a new disease, known as "yellowing of melon plants", which has been associated to a new viral agent, the melon yellowing-associated virus (myav), has been reported to cause damage on this crop since 1999. in this study we evaluated the occurrence of the myav in melon plants exhibiting suspicious symptoms of the disease in major melon growing states of the northeast region. in november 2007, commercial melon fields were inspected for the occurrence of this virus. a total of 374 plants was collected in melon fields of the states of rio grande do norte (54) and ceará (37) and in the submédio do vale do s?o francisco (283), in bahia and pernambuco states. sample evaluation was performed by das-elisa using polyclonal antibodies developed at the embrapa hortali?as for myav detection. extracts prepared from leaves and stems of symptomatic plants were used as antigen. the myav was detected in 58.0% of the collected samples. interestingly, the virus concentration was higher in stems than in leaves. the incidence of myav was higher in samples collected from rio grande do norte (96.3%) and ceará (75.7%) fields than from those in the submédio do vale do s?o francisco (pernambuco and bahia, with 48.4%). these data confirmed the widespread occurrence of the virus in melon fields of the main melon-producing areas of northeastern brazil and the efficiency of the antibody for myav detection.
Reaction of coffee genotypes to different populations of Meloidogyne spp.: detection of a naturally virulent M. exigua population
Muniz, Maria de Fátima S.;Campos, Vicente P.;Moita, Antnio W.;Gon?alves, Wallace;Almeida, Maria Ritta A.;Sousa, Fábio Rodrigues de;Carneiro, Regina Maria D. G.;
Tropical Plant Pathology , 2009, DOI: 10.1590/S1982-56762009000600002
Abstract: the reaction of seven genotypes of coffea arabica to 10 meloidogyne spp. populations collected mainly from coffee plantations in brazil and costa rica was evaluated under greenhouse conditions. the inoculum consisted of 10,000 eggs per plant. evaluations were done 8 months after inoculations considering the root fresh weight, gall and egg mass indices, number of eggs per gram of root and reproduction factor (rf). the cultivars obat? iac 1669-20, sarchimor iac 4361 and tupi amarelo iac 5111 exhibited susceptibility to the four brazilian m. exigua populations tested. however, cv. tupi vermelho iac 1669-33 revealed resistance (rf value of 0.7) to the m. exigua population from lavras, minas gerais state, brazil. a population of m. exigua from bom jesus de itabapoana, rio de janeiro state, brazil, was highly virulent on cv. iapar 59 (rf= 165.7), bearing resistance gene mex-1, and was also virulent on genotype paraíso (h 419-5-4-5-2) (rf=396.2). a meloidogyne sp. population on coffee from gar?a, s?o paulo state, brazil, reproduced at low rates (rf ranging from 0.1 to 3.9) on all genotypes. all tested cultivars were susceptible to m. incognita and m. paranaensis. m. mayaguensis of guava from paraná state, brazil, reproduced at low rates in all coffee genotypes; however, another population of coffee, from costa rica, was more aggressive and showed rf value that ranged from 0.8 to 12.4. results of this study point for the first time to the ability of a naturally occurring m. exigua population to overcome the resistance conferred by the mex-1 gene.
Resistência de genótipos de batata a Meloidogyne javanica
Charchar, Jo?o Maria;Moita, Antnio Williams;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000300019
Abstract: the resistance of 48 brazilian and european potato genotypes to infection by meloidogyne javanica was evaluated in a naturally infested field, in the dry and rainy seasons in the federal district, brazil. the experimental design was the complete randomized block with four replicates and plots with ten plants. in the dry season (may to september), the infection levels on the marketable tubers reached up to 9.7%, with the soil temperatures ranging from 13.5oc to 27.7oc. the levels of infection varied from 31.0% to 93.5% in the rainy season (november to march), under higher soil temperatures ranging from 27.0oc to 33.0oc. 'achat' behaved as the most resistant to m. javanica among the 48 potato genotypes, and presented percentages of infection on the marketable tubers of 1% in the dry season and 31.0% in the rainy season.
Resistência de genótipos de batata a Meloidogyne javanica
Charchar Jo?o Maria,Moita Antnio Williams
Pesquisa Agropecuária Brasileira , 2001,
Abstract: A resistência de 48 genótipos de batata brasileiros e europeus à infec o por Meloidogyne javanica foi avaliada em campo naturalmente infestado, em época seca e chuvosa, no Distrito Federal. O delineamento experimental foi o de blocos casualizados, com quatro repeti es e parcelas com dez plantas. Na época seca (maio a setembro), os níveis de infec o em tubérculos comerciais foram de, no máximo, 9,7%, com as temperaturas do solo variando de 13,5oC a 27,7oC. Na época chuvosa (novembro a mar o), os níveis de infec o por M. javanica variaram de 31,0% a 93,5% em tubérculos de batata em solo com temperaturas mais elevadas, de 27,0oC a 33,0oC. 'Achat', com maior grau de resistência a M. javanica entre os 48 genótipos de batata avaliados, apresentou porcentagem de infec o de tubérculos comerciais de 1% na época seca e de, no máximo, 31% na época chuvosa.
The Cadherin Superfamily in Anopheles gambiae: a Comparative Study With Drosophila melanogaster
Catarina Moita,Sérgio Sim es,Luís F. Moita,António Jacinto,Pedro Fernandes
Comparative and Functional Genomics , 2005, DOI: 10.1002/cfg.473
Abstract: The cadherin superfamily is a diverse and multifunctional group of proteins with extensive representation across genomes of phylogenetically distant species that is involved in cell–cell communication and adhesion. The mosquito Anopheles gambiae is an emerging model organism for the study of innate immunity and host–pathogen interactions, where the malaria parasite induces a profound rearrangement of the actin cytoskeleton at critical stages of infection. We have used bioinformatics tools to retrieve present sequence knowledge about the complete repertoire of cadherins in A. gambiae and compared it to that of the fruit fly, Drosophila melanogaster. In A. gambiae, we have identified 43 genes coding for cadherin extracellular domains that were re-annotated to 38 genes and represent an expansion of this gene family in comparison to other invertebrate organisms. The majority of Drosophila cadherins show a 1 : 1 Anopheles orthologue, but we have observed a remarkable expansion in some groups in A. gambiae, such as N-cadherins, that were recently shown to have a role in the olfactory system of the fruit fly. In vivo dsRNA silencing of overrepresented genes in A. gambiae and other genes showing expression at critical tissues for parasite infection will likely advance our understanding of the problems of host preference and host𕢓pathogen interactions in this mosquito species.
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