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Search Results: 1 - 10 of 659118 matches for " M.L.C.;Fahl "
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Influênciado ethephoncom e sem uréia no florescimento de plantas de abacaxi (Ananas comosus (L.) Merrill 'Cayenne') Influence of ethephon and urea on the flowering of pineapple (Ananas comosus (L.) Merril 'Cayenne')
J.I. Fahl,M.L.C. Carelli,J.F. Franco
Planta Daninha , 1981, DOI: 10.1590/s0100-83581981000200003
Abstract: Foram estudados os efeitos de ethephon, com e sem uréia no controle do florescimento de abacaxizeiro 'Cayenne". Foram utilizadas as concentra es de 475 e 950 ppm de ethephon, e essas mesmas doses em combina o com uréia a 2%, em pulveriza o sobre toda a planta. Verificou-se que 60 dias após os tratamentos, a porcentagem de inflorescências emergidas das plantas das parcelas que receberam 950 ppm de ethephon foi significativamente maior do que as que receberam 475 ppm; por outro lado, essa dose quando acrescida de uréia foi superior à de 950 ppm isolada. Entretanto, a concentra o de 950 ppm de ethephon adicionado de uréia foi o melhor tratamento, apresentando mais de 50% de inflorescéncias emergidas, enquanto que a testemunha permaneceu em estádio vegetativo. Aos 116 dias da aplica o, todas as plantas apresentaram inflorescências emergidas excetuando-se as plantas testemunhas, das quais apenas 4,6% atingiram esse estádio de desenvolvimento. A adi o de uréia ao ethephon aumentou significativamente a eficiência deste produto em antecipar o florescimento. O tempo necessário para se obt er ce rca de 100% de inflorescências emergidas foi 74, 95, 95 e 116 dias após a aplica o, respectivamente para os tratamentos de 950 ppm de ethephon + uréia a 2%, 950 ppm de ethephon, 475 ppm de ethephon + uréia a 2% e 475 ppm de ethephon. The effects of ethephon, applied at concentrations of 475 and 950 ppm alone or with urea at 2%, on the flowering of pineapple, were studied in a field experiment. At 60 days after appl ication, the treatment with 950 ppm of ethephon alone showed higher percentage of emerged inflorescences than that with 475 ppm, but this concentrations plus urea was superior than 950 ppm alone. The highest number of inflorescences, over 50%, was achieved with 950 ppm of ethephon plus urea, while the check remained in vegetative stage. At 116 days after application, all plants showed emerged inflorescences except in the check where only 4,6% reached that stage. The addition of urea to ethephon enhanced sig ni fi cative ly the efi ciency of this product in anticipate flowering. The time necessary to obtain 100% of emerged inflorescence were 74, 95, 95 e 116 days after application for 950 ppm of ethephon + urea at 2%, 950 ppm of ethephon, 475 ppm of ethephon + urea at 2% and 475 ppm of ethephon, respectively.
Varia??o dos componentes da produ??o de dois cultivares de soja, UFV-1 e IAC-7, em fun??o da época de semeadura
Nogueira, S.S.S.;Haag, H.P.;Carelli, M.L.C.;Fahl, J.L.;Maeda, J.A.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1984, DOI: 10.1590/S0071-12761984000100008
Abstract: a study was made on early, normal and delayed planting dates on the seed yield and its components of two late varieties of soybean, ufv-1 and iac-7. the field experiment was carried out at campinas experimental station in eutrophic latossolo roxo during the years 1979/80 and 1980/81. in the first year planting were made every twenty days starting from october 5 and in the second year every thirty days starting from september 17, the total being eight and seven in the consecutive years. the parameters studied were: seed yield, nodes/ /plant, podes/plant and seed weight. the planting dates affected the seed yield and its components in both varieties. the number of nodes and pods/plant were more affected than the seed weight. each variety had the same behavior with regard to the number of nodes and pods/plant and the same cannot be said to seed weight. in the first year the seed weight was not affected by the planting date and in the second, late plantings decreased the values of this parameter. the variability of yield components was more effective for highest yields planting dates. number of nodes and pods/plant exercised a greater influence on the seed yield than the seed weight.
Influência de subdoses de herbicidas e de níveis de nitrogênio na nutri o nitrogenada e na produ o de plantas de trigo (Triticum aestivum L. 'IAC 5') Influence of subrates of herbicides and nitrogen levels on the nitrogen nutrition and yield of wheat (Triticum aestivum L. 'IAC 5')
M.L.C. Carelli,R. Deuber
Planta Daninha , 1981, DOI: 10.1590/s0100-83581981000100005
Abstract: Foi estudado o efeito estimulante de nitrogênio e de subdoses de herbicidas na nutri o nitrogenada e na produ o de tr igo, cultivado no campo, em dois experimentos (1977 e 1978). 0 nitrogênio na forma de sulfato de am nio foi aplicado nas doses de 0, 30 e 60 kg N/ha, no Experimento I, e nas doses de 0, 50 e 100 kg N/ha, no Experimento II, sendo 1/3 na semeadura e o restante no início do florescimento. Neste mesmo estádio de desenvolvimento das plantas foi efetuada a pulveriza o com herbicidas nas seguintes subdoses: simazine-280 g/ha, metribuzin-75 e 90 g/ha, bromacil-140 g/ha, e o tratamento testemunha sem herbicida. Os efeitos desses tratamentos foram aval iados at ravé s de : produ o de gr os; porcentagens de N total e de S nas sementes; teor de N total da folha bandeira, amostrada em duas épocas (52 e 72 dias da semeadura); número e peso de matéria seca dos gr os de 20 espigas. A produ o n o foi influenciada pela aplica o de N nos dois experimentos realizados. Excetuando-se o metribuzin-75 g/ha, os demais herbicidas reduziram a produ o, nos dois experimentos. A aduba o nitrogenada aumentou significativamente os teores de N total da folha bandeira e os teores de N total e de S dos gr os produzidos. Esses mesmos parametros n o foram influenciados pela aplica o dos herbicidas, com exce o do simazine e do bromacil, que provocaram decréscimo no teor de N total dos gr os, no Experimento II. Nos dois experimentos realizados, o número e o peso de matéria seca dos gr os de 20 espigas n o foram alterados pelos tratamentos com níveis de N ou de herbicidas, a n o ser o bromacil, que no experimento II , provocou decréscimos nesses parametros. The estimulant effect of nitrogen and subrates of herbicides on the nitrogen level and yield of wheat was studied in two field experiments. Nitrogen, as ammonium sulfate, was applied at 0, 30 and 60 kg/ha in the first experiment (1977) and at 0, 50 and 100 kg/ha in the second one (1978), being a third part at seeding and the remaining at the flower set begining. At this stage, simazine at 280 g/ha, metribuzin at 75 and 90 g/ha and bromacil at 140 g/ha, were also applied on the wheat plants. The effect of these treatments were evaluated through grain yield, N and S content in the grains, N content in the flag leave, at 52 and 72 days after seeding, and number and weight of the grains of 20 ears. The yield was not affected by the N applications in both experiments. Exception for metribuzin at 75 g/ha, the other herbicide treatments reduced yield in both experiments. The N fertilization enhanced significantly the N
Molecular typing of HLA class II antigens in a S o Paulo population
Goldberg A.C.,Chiarella J.M.,Marin M.L.C.,Rosales C.
Genetics and Molecular Biology , 1998,
Abstract: In the present paper we show data obtained from a normal population with a racially mixed profile typical of the city of S o Paulo, State of S o Paulo. Data were generated with polymerase chain reaction using sequence specific primers (PCR-SSP) for HLA-DRB and polymerase chain reaction followed by hybridization with sequence specific oligonucleotide probes (PCR-SSO) for HLA-DQA1 and HLA-DQB1 loci. HLA-DRB, DQA1, DQB1 and haplotype frequencies as well as common linkage disequilibria were found. This population was also shown to be in genetic equilibrium according to the Hardy-Weinberg law. HLA-DR typing of a normal sample from the city of Porto Velho, State of Rondonia, highlighted the importance of different sets of HLA profiles found in other regions of the country. This database provides essential information for screening studies of disease associations, forensic analyses and transplants.
Factors influencing electroporation-mediated gene transfer to Stylosanthes guianensis (Aubl.) Sw. protoplasts
Quecini, V.M.;Oliveira, C.A. de;Alves, A.C.;Vieira, M.L.C.;
Genetics and Molecular Biology , 2002, DOI: 10.1590/S1415-47572002000100014
Abstract: in order to develop a high-efficiency and reproducible transformation protocol for stylosanthes guianensis we assessed the biological and physical parameters affecting plant electroporation protoplasts. energy input, as combinations of electric field strengths discharged by different capacitors, electroporation buffer and dna form were evaluated. transformation efficiency was assayed in vivo as transient reporter gene expression, using the gfp-coding gene mgfp5 driven by a camv 35s constitutive promoter. energy input and electric field strength had a critical influence on transgene expression with higher transformation levels being achieved with 250 v.cm-1 discharged by 900 and 1000 mf capacitors. linear plasmid dna, the absence of chloride and the presence of calcium ions also increased transient gene expression, albeit not significantly.
Factors influencing electroporation-mediated gene transfer to Stylosanthes guianensis (Aubl.) Sw. protoplasts
Quecini V.M.,Oliveira C.A. de,Alves A.C.,Vieira M.L.C.
Genetics and Molecular Biology , 2002,
Abstract: In order to develop a high-efficiency and reproducible transformation protocol for Stylosanthes guianensis we assessed the biological and physical parameters affecting plant electroporation protoplasts. Energy input, as combinations of electric field strengths discharged by different capacitors, electroporation buffer and DNA form were evaluated. Transformation efficiency was assayed in vivo as transient reporter gene expression, using the GFP-coding gene mgfp5 driven by a CaMV 35S constitutive promoter. Energy input and electric field strength had a critical influence on transgene expression with higher transformation levels being achieved with 250 V.cm-1 discharged by 900 and 1000 muF capacitors. Linear plasmid DNA, the absence of chloride and the presence of calcium ions also increased transient gene expression, albeit not significantly.
Preparation and Characterization of Hydrous Zirconium Oxide Formed by Homogeneous Precipitation
Silva, G.L.J.P. da;Silva, M.L.C.P. da;Caetano, Tatiana;
Materials Research , 2002, DOI: 10.1590/S1516-14392002000200011
Abstract: this paper reports on the preparation, characterization and study of the ion exchange behavior of hydrous zirconium oxides formed by homogeneous precipitation from zirconium oxychloride. the precipitants used were obtained by thermal decomposition of urea, sodium nitrite or ammonium carbonate. seven compounds were prepared and characterized by thermal analysis, x-ray diffractometry and by surface area measurements. amorphous forms were obtained in each case, a result that agrees with those obtained by conventional gel precipitation methodology. all these materials present surface area values of >148 m2.g-1, determined after heat treatment at 50 °c. the ion exchange behavior of each hydrous zirconium oxide prepared was studied using k+ as the exchanged species and the results compared with those obtained for hydrous zirconium oxide originally precipitated by the sol gel method.
Evaluation of inorganic matrixes as supports for immobilization of microbial lipase
Castro, H.F.;Silva, M.L.C.P.;Silva, G.L.J.P;
Brazilian Journal of Chemical Engineering , 2000, DOI: 10.1590/S0104-66322000000400048
Abstract: candida rugosa was immobilized by physical adsorption on several inorganic supports using hexane as coupling medium. the enzymatic activities of the different derivatives were determined by both hydrolysis of olive oil and esterification of n-butanol with butyric acid. the results were compared to previous data obtained by using a controlled porous silica matrix. the goal was to contribute in searching inexpensive supports for optimum lipase performance. all supports examined exhibited good properties for binding the enzyme lipase. zirconium phosphate was the best support, giving the highest percentage of protein fixation (86%) and the highest retention of lipase activity after immobilization (34%). the operational stability performance for niobium oxide derivative was improved by previously activated the support with silane and glutaraldehyde. thermal stabilities were also examined by thermal gravimetric analysis (tg).
Preparation and Characterization of Hydrous Zirconium Oxide Formed by Homogeneous Precipitation
Silva G.L.J.P. da,Silva M.L.C.P. da,Caetano Tatiana
Materials Research , 2002,
Abstract: This paper reports on the preparation, characterization and study of the ion exchange behavior of hydrous zirconium oxides formed by homogeneous precipitation from zirconium oxychloride. The precipitants used were obtained by thermal decomposition of urea, sodium nitrite or ammonium carbonate. Seven compounds were prepared and characterized by thermal analysis, X-ray diffractometry and by surface area measurements. Amorphous forms were obtained in each case, a result that agrees with those obtained by conventional gel precipitation methodology. All these materials present surface area values of >148 m2.g-1, determined after heat treatment at 50 °C. The ion exchange behavior of each hydrous zirconium oxide prepared was studied using K+ as the exchanged species and the results compared with those obtained for hydrous zirconium oxide originally precipitated by the sol gel method.
Evaluation of inorganic matrixes as supports for immobilization of microbial lipase
Castro H.F.,Silva M.L.C.P.,Silva G.L.J.P
Brazilian Journal of Chemical Engineering , 2000,
Abstract: Candida rugosa was immobilized by physical adsorption on several inorganic supports using hexane as coupling medium. The enzymatic activities of the different derivatives were determined by both hydrolysis of olive oil and esterification of n-butanol with butyric acid. The results were compared to previous data obtained by using a controlled porous silica matrix. The goal was to contribute in searching inexpensive supports for optimum lipase performance. All supports examined exhibited good properties for binding the enzyme lipase. Zirconium phosphate was the best support, giving the highest percentage of protein fixation (86%) and the highest retention of lipase activity after immobilization (34%). The operational stability performance for niobium oxide derivative was improved by previously activated the support with silane and glutaraldehyde. Thermal stabilities were also examined by thermal gravimetric analysis (TG).
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