Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

4 ( 1 )

2020 ( 13 )

2019 ( 162 )

2018 ( 235 )

Custom range...

Search Results: 1 - 10 of 95633 matches for " Jandiê Araújo da;Oliveira "
All listed articles are free for downloading (OA Articles)
Page 1 /95633
Display every page Item
Rendimento produtivo e econ?mico do feij?o-caupi em fun??o de doses de potássio
Oliveira, Ademar Pereira de;Silva, Jandiê Araújo da;Lopes, Edson Batista;Silva, Erllens éder;Araújo, Lucia elena Avelino;Ribeiro, Valéria Veras;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000200042
Abstract: cowpea bean [vigna unguiculata (l) walp] is one the main crops in the northeast region of brazil. with the objective of evaluating the effect of potassium fertilization on cowpea bean cv. pitiúba, an experiment was carried out at federal university of paraíba, in areia (pb), brazil, on a quartz psamment soil, from july to september 2005. the experimental design was the randomized blocks, with six treatments (0, 50, 100, 150, 200, and 250 kg ha-1 k2o), and four replications. each plot contained 40 plants spaced 0.80 m x 0.40 m. the maximum yield of pods per plant (285 g), green grains (143 g) and dry grains (120 g) were obtained with 160, 153 and 200 kg ha-1 k2o, respectively. the levels of 210, 151, and 170 kg ha-1 k2o were responsible for the maximum yields of 4.18 t ha-1 of pods, 3.48 t ha-1 of green grains, and 1.89 t ha-1 of dry grains, respectively. the maximum level of economical efficiency for the yield of dry grains was 141 kg ha-1 k2o, with a yield of 1.87 t ha-1.
Rendimento do inhame adubado com esterco bovino e biofertilizante no solo e na folha
Silva, Jandiê A. da;Oliveira, Ademar P. de;Alves, Gibran da S.;Cavalcante, Lourival F.;Oliveira, Arnaldo N.P. de;Araújo, Maria A. M.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/S1415-43662012000300003
Abstract: the objective of this study was to evaluate the yam yield, cultivar da costa, fertilized with bovine manure doses and biofertilizer. the experimental design was randomized blocks, in subdivided plots 6 x 2 + 1 with three repetitions. in plots six doses of cattle manure (0; 6; 12; 18; 24 and 30 t ha-1) were tested, factorially combined with the presence and absence of biofertilizer and in subplots, two forms of application of biofertilizer in the soil and by spray on the leaf and an additional treatment with conventional fertilization (animal manure and npk). the doses of 30 t ha-1 of bovine manure and the biofertilizer which was applied in the soil and leaf produced tubers with ideal average weight for the commercialization. the bovine manure in doses of 19.2 t ha-1 and in the absence of biofertilizer provided maximum productivity of 20.3 t ha-1 of commercial tubers. subplots in which the biofertilizer was applied to the soil and leaf, the dose of 30 t ha-1 of cattle manure was responsible, respectively, for maximum yields of 22.8 and 24 t ha-1 of commercial tubers. the organic and conventional fertilizations did not cause any significant change in the mean tuber weight, but the conventional fertilization increased the productivity of commercial tuber.
Resposta do quiabeiro às doses de fósforo aplicadas em solo arenoso
Oliveira, Ademar P. de;Dornelas, Carina Seixas M.;Alves, Adriana U.;Alves, Anarlete U.;Silva, Jandiê Araújo da;Oliveira, Arnaldo Nonato P. de;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000200010
Abstract: the influence of phosphorus fertilization on yield of okra, cv. santa cruz was evaluated. the research was carried out in the experimental design of randomized blocks, with five treatments (0; 44; 88; 132 and 176 kg ha-1 of p), and four replications. the maximum number of fruits per plant (43) was obtained with the maximum level of 176 kg ha-1 of p. the estimated maximum yield of commercial fruits (38.6 t ha-1), was related to 139 kg ha-1 of p. the application of 137 kg ha-1 of p provided the highest economical income, yielding 38.3 t ha-1 of commercial fruits, with an increment of fruits of 17.4 t ha-1. the most economic level represented 98% of that responsible for the maximum yield, indicating that the okra responded economically to the use of p in sandy soil and, of the p level responsible for the maximum commercial yield of fruits were related to 40 mg dm-3 of available p in soil (mehlich 1), and the level responsible for the highest economic income was related to 38 mg dm-3.
Rendimento de feij?o-vagem em fun??o de doses de K2O
Oliveira, Ademar Pereira de;Silva, Jandiê Araújo;Alves, Adriana Ursulina;Dorneles, Carina Seixas M;Alves, Anarlete Ursulino;Oliveira, Arnaldo Nonato P. de;Cardoso, Edson A.;Cruz, Iordam da Silva;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000100007
Abstract: aiming to evaluate the effect of k2o levels on the increase of snap bean yield, an experiment was performed in paraíba state, brazil, in a quartz psamment soil. the experimental design was of randomized blocks, with six treatments (0; 50; 100; 150; 200 and 250 kg ha-1 of k2o), in four replications. each plot contained 40 plants spaced 1.0 m x 0.2 m. pods maximum number/plant (20 pods) and the maximum yield/plant (171 g), were obtained, respectively with 145 and 173 kg ha-1 of k2o, and pods yield reached maximum value around 25,3 t ha-1 at the level of 171 kg ha-1 of k2o. the most economic level of k2o for the production of pods was of 165 kg ha-1. the most economic level represented 96% comparing to that responsible for maximum pods production. the k2o levels that obtained maximum pods production and economic return were correlated, respectively, with 181 and 176 mg dm-3 of k available for the extractor mehlich 1.
Efeito de extratos vegetais no controle de Fusarium oxysporum f. sp tracheiphilum em sementes de caupi
Silva, Jandiê Araújo da;Pegado, Claúdia Maria Alves;Ribeiro, Valéria Veras;Brito, Noelma Miranda de;Nascimento, Luciana Cordeiro do;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000200039
Abstract: wilt caused by fusarium sp. in cowpea crop is a disease of great importance because it causes yield decrease. the control of this disease has been accomplished with uncontrolled applications of chemical fungicides causing problems for humans and environment. the present work had the objective to compare the effect of natural extracts on the control of fusarium oxysporum f. sp tracheiphlum, originated from seeds of cowpea (vigna unguiculata l), compared to chemical fungicide effect. extracts of allium sativum, anadenanthera colubrine, and ocimum basilicum were used alone or in combination with mancozeb. a 50 μl aliquot of each treatment was added in a hole (6 mm of diameter) made in the center of petri dishes with bda and a fungus mycelia disk was inoculated on it. evaluations were done during seven days, measuring the pathogen mycelial growth. seeds of cowpea were disinfected with sodium hypochlorite, sowed in plastic bags with autoclaved soil. eight days after germination, wounds were made on the basal part of the plantlets, and fungus spore suspension (1.4 x 10-5 con/ml) was applied on it. evaluations of the disease severity were accomplished daily during 30 days after inoculation, using a disease index. combination of extracts of a. sativum + ocimum basilicum and anadenanthera colubrina + ocimum basilicum did not reduce fungus mycelial growth, whereas ocimum basilicum extract alone showed minor mycelial growth, indicating fungicide action of this treatment on f. oxysporum f. sp tracheipphlum under the conditions studied. combination of mancozeb + anadenanthera colubrina was responsible for lower average of severity on the evaluated plants.
Stability and Sensory Quality of Dried Papaya  [PDF]
Ronielli Cardoso Reis, Eliseth de Souza Viana, Siomara Costa Santana da Silva, Maria Eugênia de Oliveira Mamede, ídila Maria da Silva Araújo
Food and Nutrition Sciences (FNS) , 2018, DOI: 10.4236/fns.2018.95038
Abstract: Fruit dehydration is a way of supplying the population with healthy and nutritious foods. The shelf life of dried fruit can be defined by the evaluation of changes occurred in chemical characteristics during storage. This study aims to evaluate the sensory quality and the stability of papaya cv. Tainung n° 1 dehydrated by convective drying. Fresh and dried papaya were evaluated for color, moisture, pH, acidity, water activity, soluble solids, vitamin C, carotenoids, total extractable polyphenols (TEP) and antioxidant activity (ABTS). The sensorial acceptance of the dried papaya was evaluated using a structured nine-point hedonic scale. For the stability study, the analysis of moisture, pH, titratable acidity, water activity, total carotenoids and vitamin C were carried out every 30 days of storage until 120 days. During storage, the moisture content of dried papaya remained constant, but there were undesirable changes in color, increase of acidity and reduction of soluble solids. The degradation of total carotenoids and vitamin C followed the first order reaction, and the half-life time was 346 days for carotenoids, whereas for vitamin C it was only 29 days. In the sensory analysis, the dried papaya received grades between 5.0 and 6.0 for all evaluated attributes. Dried papaya is recommended to be consumed up to 30 days, since within this period a product with higher total carotenoids content, vitamin C and with satisfactory physicochemical and sensorial characteristics were obtained.
Influence of Sub-Lethal and Lethal Concentrations of Chlorhexidine on Morphology and Glucosyltransferase Genes Expression in Streptococcus mutans UA159  [PDF]
Andréa Cristina Barbosa da Silva, Rafael Nóbrega Stipp, Renata de Oliveira Mattos-Graner, Fábio Correia Sampaio, Demetrius Ant?nio Machado de Araújo
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.413105
Abstract: Chlorhexidine (CHX) is regarded as one of the most successful antiplaque agents in controlling the formation of dental biofilm. Nevertheless, molecular mechanisms of their effects in Streptococcus mutans are largely unknown. In this work, the effects of sub-lethal and lethal concentrations of chlorhexidine (CHX) on planktonic or biofilm-organized Streptococcus mutans cells were investigated in dose- and time-dependent manner. The Minimum Inhibitory Concentration (MIC) and the Minimum Bactericidal Concentration (MBC) for planktonic cells and biofilm conditions were determined by standard methods. Quantitative PCR (qPCR) was used to quantify the relative levels of glucosyltransferase B (gtfB), gtfC and gtfD transcription of S. mutans in the presence of CHX. The CHX activity in the initial biofilm structure and morphological alterations in planktonic cells were examined by Scanning Electron Microscopy (SEM). The results indicate that CHX increased expression of gtfC and gtfD in planktonic S. mutans cells and CHX reduced the expression of gtfB, gtfC, and gtfD in biofilms. High concentrations of CHX resulted in several wilted S. mutans planktonic cells with spilled intracellular material, while decreased cells’ chain length and matrix was found when the initial biofilm was exposed to increasing concentrations of CHX. CHX’s effects against bacteria depend on the type of growth organization and the concentration and time of exposure to the drug. At sub-lethal concentrations, CHX affects the expression of glucosyltransferases, which may have anticariogenic effect.
Soil Water Availability on Growth and Development of Safflower Plants  [PDF]
Edna Maria Bonfim-Silva, Ellen Cristina Alves de Anicésio, Jakeline Rosa de Oliveira, Helon Hébano de Freitas Sousa, Tonny José Araújo da Silva
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.613207
Abstract: Safflower (Carthamus tinctorius L.) is a promising culture to be widespread in Brazil. However, the lack of basic knowledge about cultivation techniques, such as water demand by the culture, is still obstacle to the expansion of safflower in that country. The objective was, then, to evaluate the effect of the soil water availability on growth and development of safflower in the Cerrado soil of Mato Grosso, Brazil. The experiment was conducted in a greenhouse, in a completely randomized design with five water availabilities (25%, 50%, 75%, 100% and 125% of the maximum water holding capacity in the soil) and four replications. Maintenance soil moisture was performed by gravimetric method with daily weighing of experimental units. The variables analyzed were: plant height, stem diameter, number of leaves, number of heads, heads diameter, dry mass of shoots, heads, and roots. The results were submitted to analysis of variance and regression test at 5% probability by SISVAR program. All variables set to the quadratic regression model, showing the best results in the water availability between 64% and 76%. Safflower is shown to be more sensitive to water stress with increased tolerance to water deficit in the soil than to flooding.
Soil Water Availabilities in the Content and Accumulation of Nitrogen and Chlorophyll Index in the Safflower  [PDF]
Edna Maria Bonfim-Silva, Ellen Cristina Alves de Anicésio, Jakeline Rosa de Oliveira, Helon Hébano de Freitas Sousa, Tonny José Araújo da Silva
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614231
Abstract: The safflower (Carthamus tinctorius L.) is adapted to grow in adverse conditions, is tolerant to salinity and water deficit, however, its productivity increases when grown in areas with greater availability of water and in fertilized conditions, showing that the knowledge of crop management can bring income gains for producers. It is known that extreme conditions of soil moisture damage the crop development. Given this context, the objective was to evaluate the influence of water availability on the nutritional characteristics of the safflower. The experiment was conducted in a greenhouse in a completely randomized design with five water availabilities (25%, 50%, 75%, 100% and 125% of the maximum water holding capacity of the soil) in four replications. Maintaining soil moisture was performed by gravimetric method with daily weighing of experimental units. The variables analyzed were SPAD reading (chlorophyll content), concentration and accumulation of nitrogen in the shoot and in the sections. The results were submitted to analysis of variance and regression test at 5% probability by Sisvar program. There was adjusting of variables to linear and quadratic regression models. Water availabilities between 65% and 75% have greater potential to promote better nutrition for safflower plants. Both deficit and excess of water in the soil are detrimental to the absorption of nitrogen and reduce the chlorophyll content. Safflower is less tolerant to excess than to deficit of water.
Infographics and Pericyclic Reactions: Multimodal Resources in Teaching of Organic Chemistry  [PDF]
Aldo Sena de Oliveira, Ana Carolina Araújo da Silva, Patrícia Bulegon Brondani, Mor-gana Aline Voigt, Paola Stéfany Maass, Mauricio Raitz Junior, Eduarda Giese
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.715214
Abstract: In this article we report the use of infographics as a pedagogical alternative to the study of a very important theme in Chemistry Teaching. We discussed the possibility of using infographics in the classroom, as a differential to extend the learning for the construction of elaborations of multiple languages and written readings. We have created dynamical content utilizing ThingLink, an online software that enables the authors to bring life to imagens through the addition of audio, videos, social network profiles, texts and other related contents. After creating a free account within the service, the user may upload a base image and attach the complementary content in a very simple manner, without the need of knowledge of advanced programming techniques. The approach makes use of multimodal modes that enhance learning and is in line with the development of proposals for education in contemporary times.
Page 1 /95633
Display every page Item

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