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Search Results: 1 - 10 of 225148 matches for " Carlos Alberto;De Bastos "
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Um ambiente multimídia e a resolu??o de problemas de física
Souza, Carlos Alberto;De Bastos, Fábio da Purifica??o;
Ciência & Educa??o (Bauru) , 2006, DOI: 10.1590/S1516-73132006000300006
Abstract: we act according to the methodological perspective of the investigation-action school, developing plans, involving teachers and students in the use of the technological and communicative means in classroom activities and we specify school actions of natural science, math and its technologies. we improve communication, self-reflection of those involved in the school process, sharing planning, trying to consolidate the dialogue in the classroom, problematizing situations, concepts and how to solve the problems, having as a mediator the scientific-technological knowledge, previously thematized and organized.
A intrigante bioquímica da niacina: uma revis?o crítica
Maria, Carlos Alberto Bastos de;Moreira, Ricardo Felipe Alves;
Química Nova , 2011, DOI: 10.1590/S0100-40422011001000007
Abstract: niacin (nicotinamide, nicotinic acid) interferes on homeostasis, dna regulation, signaling and longevity. nicotinic acid reduces synthesis of lipoproteins-apo-b and increases hdl. its antilipemic action in liver produces: 1) inhibition of dgat2, with decreased triacylglycerol synthesis, 2) downregulation of the b-chain of adenosine triphosphate synthase, leading to reduced hdl-apo-a-i catabolism. nicotinic acid could increase redox potential in vascular endothelium. hm74a receptor activation in macrophages would be responsible for the release of prostaglandins, causing flushing in epidermis. hm74a agonists could assist in identifying antilipemic agents. extended release niacin in combination with statin appears to protect cardiovascular system of patients with low hdl.
Compostos voláteis em méis florais
De Maria, Carlos Alberto Bastos;Moreira, Ricardo Felipe Alves;
Química Nova , 2003, DOI: 10.1590/S0100-40422003000100016
Abstract: a review about origin, composition and importance of volatile compounds in floral honeys is presented. hydrocarbons, aromatic components, acids, diacids, terpenoids, ketones, aldehydes, esters and alcohols have been found in honey aroma of different botanical origin. cis-rose oxide has been proposed as an indicator for tilia cordata honey. citrus honeys are known to contain methyl anthranilate, a compound which other honeys virtually lack. linalool, phenylethylalcohol, phenylacetaldehyde, p-anisaldehyde and benzaldehyde are important contributors for the aroma of different unifloral honeys. both isovaleric acid, gama-decalactone and benzoic acid appears to be important odourants for anarcadium occidentale and croton sp. honeys from brazil. the furfurylmercaptan, benzyl alcohol, delta-octalactone, eugenol, phenylethylalcohol and guaiacol appear to be only relevant compounds for anarcadium occidentale. the vanillin was considered an important odourant only for croton sp..
Glicídios no mel
Moreira, Ricardo Felipe Alves;De Maria, Carlos Alberto Bastos;
Química Nova , 2001, DOI: 10.1590/S0100-40422001000400013
Abstract: a review about composition, origin and importance of carbohydrates in honey is presented. fructose and glucose are the major carbohydrates, ranging from 65-85 % of the total soluble solids. other minor carbohydrates, chiefly di- and trisaccharides, have been also identified. fructose, glucose and sucrose are mainly originated from nectar. oligosaccharides are mainly formed by trans-a-d-glucosylation reactions catalysed by honeybee a-d-glucosidase. the profile of carbohydrates can be useful for the identification of the brazilian region in which honey was produced and may also be useful for testing brazilian honey authenticity.
Métodos para análise de ácido clorogênico
De Maria, Carlos Alberto Bastos;Moreira, Ricardo Felipe Alves;
Química Nova , 2004, DOI: 10.1590/S0100-40422004000400013
Abstract: this paper describes the analytical methods for determination of total chlorogenic acid (cga) and their individual isomers. spectrofotometric methods are adequate for total cga analysis in green coffee but they can provide inflated results for coffee products. high pressure liquid chromatography (hplc) with gel permeation column and ultraviolet (uv) monitoring is adequate for the simultaneous analysis of total cga, alkaloids and sugars in coffee products. hplc-uv-reversed phase is a simple, rapid and precise method for the determination of the individual isomers of cga. gas chromatography (gc) also is applied to the analysis of the individual isomers but phenolic acids need to be derivatized before analysis. both hplc- and gc-mass spectrometry provide an unequivocal identification of the individual isomers. the capillary electrophoresis method is simple, rapid and adequate to the simultaneous analysis of polyphenols and xanthines. advantages and limitations of each method are discussed throughout the text.
Glicídios no mel
Moreira Ricardo Felipe Alves,De Maria Carlos Alberto Bastos
Química Nova , 2001,
Abstract: A review about composition, origin and importance of carbohydrates in honey is presented. Fructose and glucose are the major carbohydrates, ranging from 65-85 % of the total soluble solids. Other minor carbohydrates, chiefly di- and trisaccharides, have been also identified. Fructose, glucose and sucrose are mainly originated from nectar. Oligosaccharides are mainly formed by trans-alpha-D-glucosylation reactions catalysed by honeybee alpha-D-glucosidase. The profile of carbohydrates can be useful for the identification of the brazilian region in which honey was produced and may also be useful for testing brazilian honey authenticity.
Compostos voláteis em méis florais
De Maria Carlos Alberto Bastos,Moreira Ricardo Felipe Alves
Química Nova , 2003,
Abstract: A review about origin, composition and importance of volatile compounds in floral honeys is presented. Hydrocarbons, aromatic components, acids, diacids, terpenoids, ketones, aldehydes, esters and alcohols have been found in honey aroma of different botanical origin. Cis-rose oxide has been proposed as an indicator for Tilia cordata honey. Citrus honeys are known to contain methyl anthranilate, a compound which other honeys virtually lack. Linalool, phenylethylalcohol, phenylacetaldehyde, p-anisaldehyde and benzaldehyde are important contributors for the aroma of different unifloral honeys. Both isovaleric acid, gama-decalactone and benzoic acid appears to be important odourants for Anarcadium occidentale and Croton sp. honeys from Brazil. The furfurylmercaptan, benzyl alcohol, delta-octalactone, eugenol, phenylethylalcohol and guaiacol appear to be only relevant compounds for Anarcadium occidentale. The vanillin was considered an important odourant only for Croton sp..
Métodos para análise de ácido clorogênico
De Maria Carlos Alberto Bastos,Moreira Ricardo Felipe Alves
Química Nova , 2004,
Abstract: This paper describes the analytical methods for determination of total chlorogenic acid (CGA) and their individual isomers. Spectrofotometric methods are adequate for total CGA analysis in green coffee but they can provide inflated results for coffee products. High pressure liquid chromatography (HPLC) with gel permeation column and ultraviolet (UV) monitoring is adequate for the simultaneous analysis of total CGA, alkaloids and sugars in coffee products. HPLC-UV-reversed phase is a simple, rapid and precise method for the determination of the individual isomers of CGA. Gas chromatography (GC) also is applied to the analysis of the individual isomers but phenolic acids need to be derivatized before analysis. Both HPLC- and GC-mass spectrometry provide an unequivocal identification of the individual isomers. The capillary electrophoresis method is simple, rapid and adequate to the simultaneous analysis of polyphenols and xanthines. Advantages and limitations of each method are discussed throughout the text.
Produtividade, crescimento e parti??o de matéria seca em duas cultivares de feij?o
Andrade, Carlos Alberto de Bastos;Scapim, Carlos Alberto;Braccini, Alessandro de Lucca e;Martorelli, Danilo Takara;
Acta Scientiarum. Agronomy , 2009, DOI: 10.4025/actasciagron.v31i4.6397
Abstract: growth and yield of ouro negro and brs mg talism? cultivars bean grains were characterized by field experiments, in field conditions, at the coimbra experimental station, state of minas gerais, brazil, federal university of vi?osa, minas gerais state, brazil. bean vegetative growth and grain yield of two cultivars were evaluated. samples at 12, 22, 36, 51, 65 and 76 days after emergence were collected to determine foliar area, biomass of different aerial components, foliar area index, absolute growth and net assimilation rates. grain yield and its components (number of plants per area, number of pods per plant, number of grains per pod and average mass of one hundred grains) were determined at 80 days after emergence (harvest). vegetative growth of the two cultivars was similar, although the ouro negro cultivar had higher accumulation rates of total dry matter, absolute growth rate, foliar area index and net assimilation rate. relative growth rate was higher in brs mg talism? cultivar.
Produtividade, crescimento e parti o de matéria seca em duas cultivares de feij o = Yield, growth and dry matter partition in two common bean cultivars
Carlos Alberto de Bastos Andrade,Carlos Alberto Scapim,Alessandro de Lucca e Braccini,Danilo Takara Martorelli
Acta Scientiarum : Agronomy , 2009,
Abstract: Com o objetivo de caracterizar o crescimento e a produtividade de gr os, das cultivares ‘Ouro Negro’ e ‘BRS MG Talism ’, em condi es de campo, na Esta o Experimental de Coimbra, Estado de Minas Gerais, pertencente à Universidade Federal de Vi osa (UFV), experimentos de campo foram conduzidos em que se avaliaram o crescimento vegetativo e a produtividade de gr os das duas cultivares. Foram efetuadas amostragens aos 12, 22, 36, 51, 65 e 76 dias após emergência (DAE), sendo determinadas a área foliar e a biomassa dos diferentescomponentes da parte aérea, além do índice de área foliar e das taxas de crescimento absoluto e assimilatórias líquidas. Aos 80 DAE (colheita), foram determinados a produtividade de gr os e os seus componentes (número de plantas por área, número de vagens por planta, número de gr os por vagens e massa média de 100 gr os). O crescimento vegetativo de ambas as cultivares foi semelhante, mas a cultivar ‘Ouro Negro’ apresentou os maiores valores de acúmulo de matériaseca total, taxa de crescimento absoluto, índice de área foliar e taxa assimilatória líquida. A taxa de crescimento relativo foi maior na cultivar ‘BRS MG Talism ’. Growth and yield of Ouro Negro and BRS MG Talism cultivars bean grains were characterized by field experiments, in field conditions, at the Coimbra Experimental Station, state of Minas Gerais, Brazil, Federal University of Vi osa, Minas Gerais State, Brazil. Bean vegetative growth and grain yield of two cultivars were evaluated. Samples at 12, 22, 36, 51, 65 and 76 days after emergence were collected to determine foliar area, biomass of different aerial components, foliar area index, absolute growth and net assimilation rates. Grain yield and its components (number of plants per area, number of pods per plant, number of grains per pod and average mass of one hundred grains) were determined at 80 days after emergence (harvest). Vegetative growth of the two cultivars was similar, although the Ouro Negro cultivar had higher accumulation rates of total dry matter, absolute growth rate, foliar area index and net assimilation rate. Relative growth rate was higher in BRS MG Talism cultivar.
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