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Search Results: 1 - 10 of 52223 matches for " Elka Costa Santos Nascimento "
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Initial Growth and Gas Exchanges of Plants of Colored Cotton Submitted to Saline Stress  [PDF]
Hallyson Oliveira, Ronaldo do Nascimento, Samuel Silva, José Alberto Ferreira Cardoso, Rafaela Felix Basílio Guimar?es, Elka Costa Santos Nascimento
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.912115
Abstract: The objective of the research was to evaluate the effects of saline stress on the initial growth and physiological parameters of three varieties of cotton plants, being two cultivars of colored fiber (BRS Topázio and BRS Verde) and one of white fiber (BRS 286). The experiment was conducted under greenhouse conditions. After chemical depletion with sulfuric acid, five seeds were seeded in polyethylene pots of 20 kg, leaving only one plant per pot after thinning. The experimental design was completely randomized, with a factorial scheme of 3 × 5, with five replications, totaling 75 plots, being three cotton varieties and five saline stress treatments—1.1; 3.1; 5.1; 7.1; 9.1 dS m1. The evaluations occurred at 15 and 30 days after the beginning of the treatments (DAT) for growth variables (plant height, stem diameter, number of leaves and leaf area) and gas exchange (stomatal conductance, net photosynthesis rate and transpiration. The variety that was most resistant to the salt stress levels studied was BRS 286, followed by BRS Topazio and BRS Verde.
Growth and Photosynthetic Pigments of Cotton Cultivars Irrigated with Saline Water  [PDF]
Elka Costa Santos Nascimento, Ronaldo do Nascimento, André Alisson Rodrigues da Silva, Carlos Vailan de Castro Bezerra, Mateus Costa Batista, Luana Lucas de Sá Almeida Veloso, Márcia Cristina de Araújo Pereira, Hallyson Oliveira
Agricultural Sciences (AS) , 2019, DOI: 10.4236/as.2019.101007
Abstract: The cultivation of cotton is a relevant socioeconomic activity in the Brazilian agricultural scenario. In the Brazilian Northeast, however, production is limited by low rainfall, requiring water supplementation, a problem for the cotton cultivation practiced in the semi-arid region, due to the presence of saline ions in several water sources, from where the water is used for irrigation. It is necessary to identify cultivars that better tolerate saline stress in order to provide subsidies for their cultivation under such conditions. In this sense, the objective was to evaluate the tolerance of cotton cultivars to salinity. The experiment was conducted in a greenhouse, belonging to the Natural Resource Technology Center of the Federal University of Campina Grande, Campus I, Campina Grande, Brazil, in a completely randomized design in a 2 × 5 factorial scheme, with four replications, totaling 40 experimental units (BRS 368 RF and BRS SAFIRA) submitted to five saline levels (1.5, 3.0, 4.5, 6.0 and 7.5 dS·mˉ1). Irrigation with water saline of EC from 1.5 dS·mˉ1 affects adversely the growth of cotton cultivars, causing reductions in plant height, stem diameter, leaf area and number of leaves. Saline stress reduced the levels of the photosynthetic pigments of the cotton plants studied.
Qualidade de flores de girassóis ornamentais irrigados com águas residuária e de abastecimento
de Andrade,Leandro Oliveira; Raj Gheyi,Hans; Gomes Nobre,Reginaldo; da Silva Dias,Nildo; Santos Nascimento,Elka Costa;
Idesia (Arica) , 2012, DOI: 10.4067/S0718-34292012000200003
Abstract: the use of treated wastewater is being practiced in agriculture and tends to be an economical and environmental alternative for flower cultivation, especially for cut flowers, as the final product has no direct contact with the water. the objective of this research was to evaluate the use of this alternative source of irrigation water on the growth of cut sunflower genotypes under an organic system. the trial was carried out in a greenhouse at universidade federal de campina grande - pb, brazil, adopting a randomized block design in a 4 x 2 factorial with three replicates and two plants per plot, with 4 genotypes of sunflower (helianthus annuus l.) (embrapa v2000/122 - g1, sol noturno - g2, sol vermelho - g3 and debiblis crème - g4) combined with 2 irrigation treatments (municipal supply water - a1 and treated sewage wastewater - a2). the treated wastewater was significantly better for the variables plant height, stem diameter, leaf number, external and internal diameter of the capitulum , as well as number of petals. in general the best genotype was sol noturno, which stood out particularly after harvest, with the best result for durability.
Componentes de produ??o de pinh?o manso irrigado com água de diferentes condutividades elétrica e doses de fósforo
Sousa, Antonio Evami Cavalcante;Gheyi, Hans Raj;Soares, Frederico Antonio Loureiro;Nobre, Reginaldo Gomes;Nascimento, Elka Costa Santos;
Ciência Rural , 2012, DOI: 10.1590/S0103-84782012000600009
Abstract: the physic nut has attracted considerable interest in recent years because of the high potential to provide oil for biofuel production and this has caused the rapid expansion of cultivated area worldwide. this research aimed to evaluate the influence of irrigation with water of different electrical conductivity (ecw) and two doses of phosphorus on the production components of physic nut during the third year of production. a randomized block design in a factorial (5x2) was adopted with four repetitions, with five levels of salinity (ecw - 0.6 control; 1.2; 1.8; 2.4 and 3.0ds m-1) of the irrigation water and two doses of p2o5 (135 and 200g plant-1 year-1), in which the water of 0.6ds m-1 refers to municipal supply water and the dose of 135g plant-1 is the recommended dose for physic nut. plants were cultivated in recipient of 200l and irrigated at intervals of three days. the number of days for inflorescence, number of clusters plant-1, grain yield and oil content of physic nut seeds were negatively affected by the increasing salinity of the irrigated water. the cultivation of physic nut irrigated with electrical conductivity of 1.3ds m-1 reduces the productivity by 10% and consequently the seed oil content. only the number of days for inflorescence was affected by phosphorus doses. a positive and significant correlation between weight of 100 seeds and oil content of seeds was observed and in the treatment with the lowest ecw the values obtained were respectively 90.26g and 36.39%.
Teor de óleo no pinh?o manso em fun??o de laminas de água residuária
Sousa, Antonio Evami Cavalcante;Gheyi, Hans Raj;Soares, Frederico Antonio Loureiro;Medeiros, Everaldo Paulo de;Nascimento, Elka Costa Santos;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011000100015
Abstract: the objective of this work was to study the influence of different levels of wastewater and two doses of phosphorus on the productivity and oil content of physic nut seeds. a randomized design in a 5x2 factorial arrangement was used, with four replicates with one plant per plot. treatments consisted of a combination of five levels of irrigation depths (0.25, 0.50, 0.75, 1.00 and 1.25 of water consumption) and two doses of p2o5 (135 and 200 g per plant) per year. the productivity and oil content of the seeds were positively and significantly affected by water depths, while phosphorus doses had no influence.
Tuberculose miliar e febre Q em doente imunocompetente
Sim?es,Sandra; Santos,Arsénio; Vaio,Teresa; Leit?o,Sara; Santos,Rui M; Costa,Nascimento;
Revista Portuguesa de Pneumologia , 2009,
Abstract: miliary tuberculosis is a progressive disease resulting from the massive hematogeneous dissemination of mycobacterium tuberculosis. immunocompromised and elderly patients are the most affected. a case of an immunocompetent 45 year old man, with miliary tuberculosis and a simultaneous infection by coxiella burnetti is presented. the clinical presentation demands a high awareness for the presence of tuberculosis. the rarity of this association, only one case reported in literature, appears to be a fortuity coincidence.
Irradiance of phototherapy equipment in maternity wards in Maceió
Ferreira, Anne Laura Costa;Nascimento, Renata Medeiros do;Veríssimo, Regina Célia Sales Santos;
Revista Latino-Americana de Enfermagem , 2009, DOI: 10.1590/S0104-11692009000500016
Abstract: the effectiveness of neonatal hyperbilirubinaemia treatment depends directly on the amount of energy emitted by light (irradiance). this cross-sectional study aimed to determine the irradiance of phototherapy equipment in maternity wards in maceió, al, brazil. all equipment in use in the neonatal units in maceió was included in the study, totaling 36 devices, except those in maintenance. the measurement of irradiance was carried out with a radiometer. we observed that 72.20% of the equipment presented efficient irradiance and 27.76% were inefficient. the conclusion is that the majority of phototherapy devices are emitting the minimum required irradiance for neonatal jaundice treatment.
Individual and Combined Effects of the Extractant, Surfactant and Modifier Concentrations on the Droplet Coalescence Time of the Primary Emulsion in the Liquid Surfactant Membrane Extraction Process  [PDF]
Adriane Salum, Lorena da Costa Nascimento, Tania Lúcia Santos Miranda, Leandro Dornellas Sampaio Andrade, Cibele Konzen, Julio Cézar Balarini, Estêv?o Magno Rodrigues Araújo, Fabrício Eduardo Bortot Coelho
Advances in Chemical Engineering and Science (ACES) , 2018, DOI: 10.4236/aces.2018.84014
Abstract: In this work, the individual and combined effects of the extractant, surfactant and modifier concentrations on the droplet coalescence time of the primary emulsion in the liquid surfactant membrane extraction process were evaluated, through emulsification experiments. Adogen 464 was used as extractant (carrier), and Escaid 110, as diluent. Two systems were studied. The first one composed by the extractant, the surfactant and the diluent, and the second one composed by the same reagents, but with the addition of 1-decanol as modifier. It was observed that, when the modifier is not present in the membrane phase, the surfactant not only stabilizes the primary emulsion, but, apparently, it also plays a role similar to that of the alcohol, promoting the solvation of the amine in a low polarity diluent. Furthermore, the extractant, a quaternary amine, helps to stabilize the primary emulsion in systems without a modifier. For membrane phases consisting of 1 or 5% w/w of Adogen 464 and 2% or 5% w/w of ECA 4360, a concentration of 3% w/w of 1-decanol was sufficient to promote the solvation of Adogen 464 in Escaid 110 and to obtain a low droplet coalescence time.
Síndromes coronarianas agudas na ausência de doen?a arterial coronariana significativa
Pinheiro, Maria das Gra?as Viana;Rabelo Jr., Alvaro;Jesus, Rogerio Santos de;Nascimento, Luciana Cunha;Costa, Ursula Maria Moreira;
Arquivos Brasileiros de Cardiologia , 2005, DOI: 10.1590/S0066-782X2005000100006
Abstract: objective: to assess the clinical characteristics, evolution, and in-hospital complications of patients with acute coronary syndromes (acs) in the absence of significant obstructive coronary artery disease (cad). methods: cross-sectional study of patients hospitalized from august 1996 to march 2002 with acute coronary syndrome, with or without an elevation in the st segment, and with (= 50%) or without (<50%) significant coronary stenosis. their clinical and demographic characteristics and their in-hospital complications were analyzed. results: of the 1351 patients admitted with acute coronary syndrome, 28% had an elevation in the st segment and 72% had no elevation. the patients with acute coronary syndrome with no elevation in the st segment and no significant coronary obstruction were younger, predominantly females, and had a lower frequency of dyslipidemia, previous coronary arterial disease, diabetes mellitus, smoking, and systemic arterial hypertension, when compared with those with significant obstructive lesion. among the individuals with acute coronary syndrome and an elevation in the st segment, smoking was the most prevalent risk factor in patients with nonsignificant obstructive lesion. in regard to complications, recurring ischemia, congestive heart failure, and arrhythmias were more frequent in patients with acute coronary syndrome with no elevation in the st segment and no significant obstructive coronary lesion. conclusion: patients with acute coronary syndrome with no elevation in the st segment and with nonsignificant obstructive coronary lesions are younger, predominantly females, have a greater frequency of risk factors for coronary arterial disease, and a lower incidence of complications as compared with patients with significant obstructive coronary lesion.
Nitrogênio e boro na produ??o e incidência de haste oca em couve-flor 'Sharon'
Mello, Simone da Costa;Camargo, M?nica Sartori de;Vivian, Rafael;Nascimento, Thaisa Sampaio;Oliveira, érica Santos de;Bertanha, Raphael;
Bragantia , 2009, DOI: 10.1590/S0006-87052009000300024
Abstract: the objective was evaluate nitrogen (100, 150, 200 and 250 kg ha-1) and boron rates (0; 1.5 kg ha-1 at planting and 1.5 kg ha-1 after 45 transplanting days and 3.0 kg ha-1 at planting) on yield and hollow stem disorder of cauliflower 'sharon' in blocks randomized in factorial design with four replications. the experiment was carried out in field conditions, in piracicaba, s?o paulo state, at nitossolo vermelho eutrófico soil during november/2005 until march/2006. the nitrogen and boron did not effect on commercial and total yield, inflorescence mass, n and b levels of leaves and inflorescences. hollow stem incidence was reduced by b application.
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