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Search Results: 1 - 10 of 722919 matches for " CASTRO A.M. "
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INFLUêNCIA DO ANELAMENTO E ESTIOLAMENTO DE RAMOS NA PROPAGA??O DA LARANJEIRA VALêNCIA (Citrus sinensis Osbeck) ATRAVéS DE ESTACAS
CASTRO, A.M.;KERSTEN, E.;
Scientia Agricola , 1996, DOI: 10.1590/S0103-90161996000200001
Abstract: with the aim of studying the effect of branch conditioning through girdling and banding on valência orange cuttings a rooting trial was carried out from february to december of 1993. the girdling was performed with a thin cooper wire tightly tied at the branch base reaching the log, and the banding with black poliethylene tape, covering the branch at the base of the sprouts. each conditioned branch gave one cutting of 15 cm length, 0.5 cm diameter and a pair of half cut apical leaves. cuttings were planted on dec.04, 93, in washed and sieved sand substrate. the experimental design was completely randomized, with a factorial 3 x 3 from 0, 30 and 60 day periods, girdling and banding. there was no rooting in cuttings that remained three months in the substrate and there was up to 26.04% rooting for those ones that lasted for eight months in the substrate. the banding period significantly affected the cuttings rooting percentage.
INFLUêNCIA DO ANELAMENTO E ESTIOLAMENTO DE RAMOS NA PROPAGA O DA LARANJEIRA VALêNCIA (Citrus sinensis Osbeck) ATRAVéS DE ESTACAS
CASTRO A.M.,KERSTEN E.
Scientia Agricola , 1996,
Abstract: Objetivando estudar a influência do condicionamento de ramos, através do anelamento e estiolamento parcial, sobre o enraizamento de estacas de laranjeira cv. Valência, conduziu-se o experimento no período de fevereiro a dezembro de 1993. Para o anelamento foi utilizado arame fino de cobre com o qual provocou-se um estrangulamento na base do ramo. No estiolamento, utilizou-se fita preta de polietileno, que foi enrolada na base das brota es. De cada ramo condicionado, obteve-se apenas uma estaca com 15 cm de comprimento, diametro médio de 0,5 cm e um par de folhas apicais, cortadas pela metade. O plantio das estacas foi realizado em 12.04.93, em substrato de areia lavada e peneirada. Adotou-se o delineamento inteiramente casualizado, em esquema fatorial 3x3, resultante das combina es entre os períodos de zero, 30 e 60 dias dos fatores anelamento e estiolamento. Verificou-se que n o ocorreu enraizamento nas estacas que permaneceram três meses no substrato e variou de 0 até 26,04% para aquelas que permaneceram oito meses. O período de estiolamento influenciou significativamente o percentual de estacas enraizadas.
Mistura em tanque de boro e herbicidas em semeadura convencional de girassol
Castro, C.;Brighenti, A.M.;Oliveira Júnior, A.;
Planta Daninha , 2002, DOI: 10.1590/S0100-83582002000100012
Abstract: the objectives of this study were to determine the response of sunflower to application of boron (b) fertilizer and herbicides, alone or in combination, and to determine its weed control. a field experiment was carried out at embrapa soja, londrina, parana, brazil. the treatments were acetochlor (1.92 kg a.i. ha-1), oxyfluorfen (0.36 kg a.i. ha-1), sulfentrazone (0.35 kg a.i. ha-1), trifluralin (1.80 kg a.i. ha-1) and two controls (with and without hoeing). all treatments were applied alone or in combination with 2 kg ha-1 of b (na2b4o7.10h2 0 - borax and h3bo3 - boric acid). acetochlor plus boric acid was the most efficient treatment. herbicides mixed with boric acid provided a more homogeneous aqueous suspension when compared with herbicides plus borax. acetochlor applied alone or in combination with two b sources was efficient in controlling wandering jew (commelina benghalensis), hairy beggarticks (bidens pilosa) and morning glory (ipomoea grandifolia). oxyfluorfen and sulfentrazone applied alone or in combination with the b sources were efficient in controlling wild poinsettia (euphorbia heterophylla) and morning glory (ipomoea grandifolia), respectively. the application of b with herbicides in tank-mixes is a good strategy for avoiding b deficiency and controlling weeds in sunflower crop.
Adsorption and electrooxidation of ethylene on Au surfaces
Zinola, C.F.;Castro Luna, A.M.;
Journal of the Brazilian Chemical Society , 1997, DOI: 10.1590/S0103-50531997000200003
Abstract: the electrochemical behavior of ethylene electrooxidation on preferentially oriented au surfaces is investigated in 1 m h2 so4 aqueous solution at 25°c. a symmetric square wave periodic potential signal is applied to polycrystalline au electrodes to obtain (111)-, (110)-, and (100)-type oriented surfaces, which are characterized by cyclic voltammograms and sem micrographs. it is found that ethylene adsorbs at potentials just below the potential of zero charge of the au/1 m h2 so4 interface, and two residues are detected in an anodic stripping experiment. the adsorbed ethylene voltammetric electrooxidation, and the bulk ethylene anodic polarization curves are measured at the differently oriented au surfaces.
Efecto del glifosato sobre el crecimiento y acumulación de azúcares libres en dos biotipos de lolium perenne de distinta sensibilidad al herbicida
Yanniccari, M.;Istilart, C.;Giménez, D.O.;Acciaresi, H.;Castro, A.M;
Planta Daninha , 2012, DOI: 10.1590/S0100-83582012000100018
Abstract: the systemic movement of glyphosate is determined by the transport of photoassimilates. in turn, the capacity of a destination to consume assimilates is conditioned by their metabolic activity. despite its importance, the relationship between the glyphosate and the sugar synthesis from source leaves has been little studied. the aim of this work was to determine the effect of glyphosate on the growth and free sugar accumulation of two lolium perenne biotypes of low and high glyphosate sensitivity. it was worked with clones of both types, in tillering, sprayed with 1,440 g a.e. ha-1 of glyphosate as treatments and without herbicide as controls. the glyphosate effects on the regrowth of leaves was studied until 50 hours post-application and on total free sugar, reducing free sugar and nonreducing free sugar from leaves to 1, 2, 3 and 5 days post-application were periodically evaluated. from 25 hours after glyphosate application, it caused on the susceptible biotype a growth decrease of 58% and an accumulation of free sugar above 90% compared to controls. in susceptible biotypes, growth inhibition does not depend on a reduced photoassimilate translocation from the overground part. therefore, the free sugar accumulation in leaves could be explained by the fall in the rate of growth. these effects are limited in the low sensitivity biotype, where growth inhibition has not been detected.
Methanol Electrooxidation on Pt-Ru Catalysts Dispersed in Conducting Polyaniline Films
Kessler,T.; Castro Luna,A.M.; Triaca,W.E.;
Portugaliae Electrochimica Acta , 2004,
Abstract: methanol electrooxidation was investigated on tailored pt-ru-polyaniline catalysts prepared applying dynamic potential routines. the electrodes characterized by sem, edx and tem present a uniform distribution of metal particles about 100 nm in size, composed of ru and pt on the fibrous polymer matrix. the effect of concentration in the range 0.05-1 m and temperature in the range 20 to 60 oc on the methanol electrooxidation rate was determined. the apparent activation energy depends on the catalyst ru content.
Methanol Electrooxidation on Pt-Ru Catalysts Dispersed in Conducting Polyaniline Films
T. Kessler,A.M. Castro Luna,W.E. Triaca
Portugaliae Electrochimica Acta , 2004,
Abstract: Methanol electrooxidation was investigated on tailored Pt-Ru-polyaniline catalysts prepared applying dynamic potential routines. The electrodes characterized by SEM, EDX and TEM present a uniform distribution of metal particles about 100 nm in size, composed of Ru and Pt on the fibrous polymer matrix. The effect of concentration in the range 0.05-1 M and temperature in the range 20 to 60 oC on the methanol electrooxidation rate was determined. The apparent activation energy depends on the catalyst Ru content.
Isolamento e identifica??o pela imunofluorescência direta e rea??o em cadeia de polimerase do vírus da artrite-encefalite caprina
Castro, R.S.;Leite, R.C.;Resende, M.;Martins, A.;Gouveia, A.M.G.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 1999, DOI: 10.1590/S0102-09351999000300006
Abstract: this paper describes the isolation of caprine arthritis-encephalitis virus (caev) in minas gerais and pernambuco states, brazil, using goat synovial membrane (gsm) explants (isolates: brmg 1-01, brmg 2-01, brmg 2-02, brmg 2-03 and brpe 1-01) or co-culture of blood mononuclear cells with gsm (brmg 1-02). the isolates were identified by cytopathic effect (cpe), direct immunofluorescence (dif) and an improved polimerase chain reaction (prc) specific to caev (strain cork) genome. it was found isolates of low (brmg 1-01 and brmg 1-02) and of high lytic (brmg 2-01, brmg 2-02, brmg 2-03 and brpe 1-01) phenotypes. the dif revealed positive results in cells infected by all isolates tested and the reference strains of caev (cork) and visna-maedi (k1514). the used pcr amplified a 286 pb fragment of dna from cells infected with all isolates and caev cork but not with visna-maedi k1514.
Cuprous Oxide Layers Grown on Copper: Effect of CO Adsorption
Gassa,L.M.; Luna,A.M. Castro; Sánchez,R.M. Torres; Zerbino,J.O.;
Portugaliae Electrochimica Acta , 2004,
Abstract: the semiconducting properties of anodic passive films formed on polycrystalline copper in aqueous borax solutions, ph 9.2, are studied using electrochemical impedance spectroscopy (eis) and voltammetry. the semiconducting nature of the cuprous passive layer is analysed in the potential region near de rest potential as a function of the electrode potential and the presence of co dissolved in the electrolyte. the oxide formation is explained as a sequence of cu2o growth, cation adsorption, cu(ii), and dissolution steps similarly to previous reported investigationsfor the metal in co free solutions. the different growth conditions change the defect or excess of cations accumulated in the outer side of the cuprous layer/electrolyte interface leading to different semiconducting properties.
Cuprous Oxide Layers Grown on Copper: Effect of CO Adsorption
L.M. Gassa,A.M. Castro Luna,R.M. Torres Sánchez,J.O. Zerbino
Portugaliae Electrochimica Acta , 2004,
Abstract: The semiconducting properties of anodic passive films formed on polycrystalline copper in aqueous borax solutions, pH 9.2, are studied using electrochemical impedance spectroscopy (EIS) and voltammetry. The semiconducting nature of the cuprous passive layer is analysed in the potential region near de rest potential as a function of the electrode potential and the presence of CO dissolved in the electrolyte. The oxide formation is explained as a sequence of Cu2O growth, cation adsorption, Cu(II), and dissolution steps similarly to previous reported investigationsfor the metal in CO free solutions. The different growth conditions change the defect or excess of cations accumulated in the outer side of the cuprous layer/electrolyte interface leading to different semiconducting properties.
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