oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2019 ( 85 )

2018 ( 588 )

2017 ( 576 )

Custom range...

Search Results: 1 - 10 of 383185 matches for " Luiz C. F. da;Maniero "
All listed articles are free for downloading (OA Articles)
Page 1 /383185
Display every page Item
Water transfer from S?o Francisco river to semiarid northeast of Brazil: technical data, environmental impacts, survey of opinion about the amount to be transferred
Stolf, Rubismar;Piedade, Sonia M. de S;Silva, Jair R. da;Silva, Luiz C. F. da;Maniero, Miguel ?;
Engenharia Agrícola , 2012, DOI: 10.1590/S0100-69162012000600001
Abstract: the transposition of the s?o francisco river is considered one of the greatest engineering works in brazil of all time since it will cross an extensive agricultural region of continental dimensions, involving environmental impacts, water, soil, irrigation, water payment and other multidisciplinary themes. taking into account its importance, this subject was incorporated into a discipline of ufscar (federal university of s?o carlos - brazil) named "pollution and environmental impacts". it was noted strong reaction against the project, even before the presentation. to allow a critical analysis, the first objective was to compile the main technical data and environmental impacts. the second objective was to detect the three most important aspects that cause reaction, concluding for the following reasons: assumption that the volume of water to be transferred was much greater than it actually is proposed in the project; lack of knowledge about similar project already done in brazil; the idea that the artificial canal to be built was much broader than that proposed by the project. the participants' opinion about "volume to be transferred" was raised quantitatively four times: 2-undergraduate students; 1-graduate; 1-outside community. the average resulted 14 times larger than that proposed in the project, significant according to t-test. it was concluded that the reaction to water transfer project is due in part to the ignorance combined with a preconceived idea that tend to overestimate the magnitude of environmental impacts.
Water transfer from S o Francisco river to semiarid northeast of Brazil: technical data, environmental impacts, survey of opinion about the amount to be transferred Transposi o do rio S o Francisco para o nordeste semiárido do Brasil: dados técnicos, impactos ambientais e enquete sobre o volume transposto
Rubismar Stolf,Sonia M. de S Piedade,Jair R. da Silva,Luiz C. F. da Silva
Engenharia Agrícola , 2012,
Abstract: The transposition of the S o Francisco River is considered one of the greatest engineering works in Brazil of all time since it will cross an extensive agricultural region of continental dimensions, involving environmental impacts, water, soil, irrigation, water payment and other multidisciplinary themes. Taking into account its importance, this subject was incorporated into a discipline of UFSCar (Federal University of S o Carlos - Brazil) named "Pollution and Environmental Impacts". It was noted strong reaction against the project, even before the presentation. To allow a critical analysis, the first objective was to compile the main technical data and environmental impacts. The second objective was to detect the three most important aspects that cause reaction, concluding for the following reasons: assumption that the volume of water to be transferred was much greater than it actually is proposed in the project; lack of knowledge about similar project already done in Brazil; the idea that the artificial canal to be built was much broader than that proposed by the project. The participants' opinion about "volume to be transferred" was raised quantitatively four times: 2-undergraduate students; 1-graduate; 1-outside community. The average resulted 14 times larger than that proposed in the project, significant according to t-test. It was concluded that the reaction to water transfer project is due in part to the ignorance combined with a preconceived idea that tend to overestimate the magnitude of environmental impacts. A transposi o do Rio S o Francisco, uma das maiores obras de engenharia do Brasil de todos os tempos, cortará uma extensa regi o agrícola de dimens es continentais, envolvendo temas de caráter multidisciplinar, como impactos ambientais, água, solo, irriga o, outorga de água e outros. Devido a sua importancia, incorporou-se a partir de 2005 o tema a uma disciplina denominada Polui o e Impactos ambientais, UFSCar. Mesmo antes das apresenta es verificava-se forte oposi o. Preliminarmente, o objetivo do trabalho foi levantar os principais dados técnicos e impactos ambientais, culminando com uma análise crítica sobre a obra. O segundo objetivo constituiu-se em detectar no público participante das exposi es os três aspectos mais relevantes que causavam oposi o, concluindo-se pelas seguintes raz es: a pressuposi o de que o volume de água a ser transferido seria muito maior do que na realidade se prop e no projeto; o desconhecimento de outras obras de transposi o em opera o no Brasil e a ideia de que o canal artificial teria largura mu
Atividade de três drogas antivirais sobre os herpesvírus bovino tipos 1, 2 e 5 em cultivo celular
Dezengrini, Renata;Silva, Sara C. da;Weiss, Marcelo;Kreutz, Luiz C;Weiblen, Rudi;Flores, Eduardo F;
Pesquisa Veterinária Brasileira , 2010, DOI: 10.1590/S0100-736X2010001000008
Abstract: the activity of three anti-herpetic drugs (acyclovir [acv], gancyclovir [gcv] and foscarnet [pfa]) was tested against bovine herpesvirus 1 (bohv-1), 2 (bohv-2) and 5 (bohv-5) in vitro using the plaque reduction assay. different drug concentrations were tested against one hundred 50% tissue culture infectious dose (tcid50) of the respective viruses. drug concentrations lower than 200μg/ml resulted in viability rates of more than 80% for mdbk and hep2 cells in the mtt test (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide). the selectivity index (is) of the drugs was calculated dividing the concentration of the drug that is cytotoxic for 50% of the cells (cc50) by the concentration of the drug that was effective in reducing by 50% the number of viral plaques (ec50) for the three herpesviruses. thus, acv was shown to be moderately active against bohv-1 (ec50: 112.9μg/ml; is: 4.5), bohv-2 (ec50: 114.2μg/ml; is: 4.5) and bohv-5 (ec50: 96.9μg/ml; is: 5.3). gcv was effective against bohv-2 (ec50: 33.5μg/ml; is: 16.6), moderately effective against bohv-5 (ec50: 123.2μg/ml; is: 4.5) and poorly active against bohv-1 (ec50: 335.8μg/ml; is: 1.7). pfa exhibited the highest antiviral activity, being the only drug that, at concentration of 100μg/ml, completely inhibited plaque formation by all three viruses. pfa was the most effective in vitro against bohv-1 (ec50: 29.5μg/ml; is: 42.2), bohv-2 (ec50: 45.2μg/ml; is: 27.6) and bohv-5 (ec50: 7.8μg/ml; is: 160.6). thus, the results indicate that pfa is a promising candidate for experimental therapeutic testing in vivo against bovine herpesviruses.
Chlorine evolution reaction at Ti/(RuO2+Co3O4) electrodes
Silva, Leonardo M. da;Boodts, Julien F. C.;Faria, Luiz A. de;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000300008
Abstract: a systematic investigation of the mechanistic and electrocatalytic properties of the chlorine evolution reaction, cler, on mixed rutile/spinel oxides of nominal composition ti/[ruo2(x)+co3o4(1-x)] was done. electrodes were prepared using the thermal decomposition procedure (tcalc. = 470oc; tcalc. = 1h), with x varied between 0 and 1, changed in 0.1 steps. kinetics were studied recording quasi-stationary current-potential curves and reaction order determined with respect to h+ and cl-. a constant tafel slope of about 33 mv was found for the 0 - 80 mol% ruo2 concentration interval, increasing to 40 mv for higher ruo2 contents. experimental data support the mechanism originally proposed by erenburg et al. for the cler. the edge effect exerts an influence on the electronic transfer coefficient values. analysis of the electrocatalytic activity reveals an increase in the apparent electrocatalytic activity for the mixed oxides.
Xanthones from Vismia latifolia
Santos, Marcelo H. dos;Nagem, Tanus J.;Silva, Marilda C. da;Silva, Luiz G. F. e;
Journal of the Brazilian Chemical Society , 2000, DOI: 10.1590/S0103-50532000000500017
Abstract: a new xanthone,1,4,8-trihydroxyxanthone (1,4,8-trihydroxy-9h-xanthen-9-one), was isolated from the roots of vismia latifolia (guttiferae). four other known xanthones were isolated: 1,5-dihydroxy-8-methoxyxanthone, 1,7-dihydroxyxanthone, 1,6-dihydroxy-7-methoxyxanthone and 1,3,5,6-tetrahydroxyxanthone. the last two compounds were isolated for the first time from a vismia species. the structures were established by uv, ir, ms, 1d and 2d nmr spectroscopic techniques.
Soma Térmica para o Desenvolvimento dos Estádios do Tomateiro
Luiz F. Palaretti,Everardo C. Mantovani,Derly J. H. da Silva,Paulo R. Cecon
Revista Brasileira de Agricultura Irrigada , 2012, DOI: 10.7127/rbai.v6n300089
Abstract: Com o conhecimento da soma térmica, torna-se possível mensurar com maior precis o o ciclo da cultura, permitindo inferências mais refinadas em todo o ciclo produtivo. Assim, buscou-se definir a soma térmica para a cultura do tomateiro (‘Sheila’) em cada estádio de desenvolvimento, com experimento conduzido no período de junho a novembro de 2003 em Pará de Minas – MG. O plantio foi em canteiros cobertos com filme plástico e a cultura tutorada verticalmente, espa ada 1,0 x 0,8 m com duas hastes/planta, irrigada por gotejamento. O período de colheita foi de 17/09 a 10/11. No cálculo da soma térmica utilizou-se temperatura basal (10 oC) e a temperatura média diária coletada numa esta o meteorológica automática. Os valores da soma térmica ( dias) foram de 220; 118; 602 e 609 para os estádios de desenvolvimento inicial, pegamento, desenvolvimento e produ o respectivamente, totalizando 1548 graus dias.
Eugenia brachypoda, new host of Cylindrocladium pteridis in the State of Pará, Brazil
Poltronieri Luiz S.,Silva Jefferson F. da,Alfenas Acelino C.,Zauza Edival A.V.
Fitopatologia Brasileira , 2004,
Abstract:
Chlorine evolution reaction at Ti/(RuO2+Co3O4) electrodes
Silva Leonardo M. da,Boodts Julien F. C.,Faria Luiz A. de
Journal of the Brazilian Chemical Society , 2003,
Abstract: A systematic investigation of the mechanistic and electrocatalytic properties of the chlorine evolution reaction, ClER, on mixed rutile/spinel oxides of nominal composition Ti/[RuO2(x)+Co3O4(1-x)] was done. Electrodes were prepared using the thermal decomposition procedure (Tcalc. = 470oC; t calc. = 1h), with x varied between 0 and 1, changed in 0.1 steps. Kinetics were studied recording quasi-stationary current-potential curves and reaction order determined with respect to H+ and Cl-. A constant Tafel slope of about 33 mV was found for the 0 - 80 mol% RuO2 concentration interval, increasing to 40 mV for higher RuO2 contents. Experimental data support the mechanism originally proposed by Erenburg et al. for the ClER. The edge effect exerts an influence on the electronic transfer coefficient values. Analysis of the electrocatalytic activity reveals an increase in the apparent electrocatalytic activity for the mixed oxides.
Xanthones from Vismia latifolia
Santos Marcelo H. dos,Nagem Tanus J.,Silva Marilda C. da,Silva Luiz G. F. e
Journal of the Brazilian Chemical Society , 2000,
Abstract: A new xanthone,1,4,8-trihydroxyxanthone (1,4,8-trihydroxy-9H-xanthen-9-one), was isolated from the roots of Vismia latifolia (Guttiferae). Four other known xanthones were isolated: 1,5-dihydroxy-8-methoxyxanthone, 1,7-dihydroxyxanthone, 1,6-dihydroxy-7-methoxyxanthone and 1,3,5,6-tetrahydroxyxanthone. The last two compounds were isolated for the first time from a Vismia species. The structures were established by UV, IR, MS, 1D and 2D NMR spectroscopic techniques.
Primary pulmonary paraganglioma: case report and literature review
Silva Rodrigo Afonso da,Gross Jefferson Luiz,Haddad Fábio J.,Toledo Cíntia A. B.
Clinics , 2006,
Abstract:
Page 1 /383185
Display every page Item


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