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Search Results: 1 - 10 of 4895 matches for " Juliana;Alcarde "
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Radia??o gama na conserva??o do suco natural de laranja
Iemma, Juliana;Alcarde, André Ricardo;Domarco, Rachel Elisabeth;Spoto, Marta Helena Fillet;Blumer, Lucimara;Matraia, Clarice;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000500022
Abstract: the effect of gamma radiation was evaluated on the microbiological population, soluble solids content, acidity, ph and ascorbic acid content of natural orange juice. microbial activity may cause deterioration of orange juice. irradiation is a process of food conservation which eliminates microorganisms. neverthless radiation may affect some characterisitics of irradiated foods. the experimental design was a 4x5 factorial scheme, including control and 3 rates of irradiation (2.0, 4.0 and 6.0 kgy) and 5 storage periods (1, 7, 14, 21 and 28 days), with 2 replicates. samples of juice were extracted from variety "pera" oranges and irradiated at a rate of 2.0 kgy/h (60cobalt) and thereafter stored at 5 ± 3oc. results showed small changes in soluble solids content, acidity and ph, for all treatments. the ratio soluble solids/acidity was also determined and showed little variation for all treatments. there was a reduction on ascorbic acid content of the orange juice with increased radiation dosage and storage time. gamma radiation was effective in reducing the microbiological population of the juice.
Trabalhando com Ciências: o uso de oficinas pedagógicas e feira de ciências como estratégias de ensino-aprendizagem
Lígia Carolina Lavezzo,Juliana Alcarde Rudine,Flávia Amoroso Matos,Carolina Buso Dornfeld
Revista Ciência em Extens?o , 2010,
Abstract: Introdu o: A prepara o dos alunos de Licenciatura em Ciências Biológicas de Ilha Solteira conta com o auxilio das Disciplinas de Práticas Pedagógicas que levam os graduandos a produzirem materiais didáticos e os inserem na realidade da atua o profissional. Objetivos: Desta forma, o objetivo do projeto foi trazer alunos do Ensino Fundamental e Médio, da rede pública estadual e particular, para o convívio da UNESP, suplementando o conhecimento dos mesmos, sobre o conteúdo de Ciências Naturais, por meio de Oficinas Pedagógicas e Feira de Ciências realizadas ao longo do ano de 2006. Métodos: Foram ministradas quatro oficinas com diferentes temáticas e aplicados questionários de avalia o da qualidade da oficina e do aprendizado dos alunos: I) Montagem de Gibi: oferecida para 5a séries do Ensino Fundamental e repetidas dez vezes, com o tema Cadeia Alimentar e Intera es entre seres vivos, II) Rochas Ornamentais: atendendo 5a e 6a séries do Ensino Fundamental e repetidas nove vezes. Nessa atividade foram demonstrados diferentes tipos de rocha obtidas em uma cole o da UNESP, III) Ovo: realizadas em 7a e 8a séries do Ensino Fundamental, apresentando conceitos físicos (empuxo e densidade) e biológicos (conteúdo nutricional) e IV) Extra o de DNA de espécie vegetal (cebola): repetidas onze vezes e trabalhadas no Ensino Fundamental e Médio. Participaram 4 escolas: Escola Estadual Arno Hausser, Colégio Euclides da Cunha, NEP Objetivo, Escola Estadual LEA, totalizando 755 alunos. Ao fim das atividades, realizou-se uma Feira de Ciências, nos dias 29 e 30/11/2006, que representava um espa o para produ o coletiva do conhecimento e um lugar para se repensar a rela o entre educa o e sociedade. Exposi es e atividades desenvolvidas: Museu de Invertebrados, Museu de Vertebrados, Jogos, Música e Oficina do Gibi. Trabalhos apresentados pelas escolas participantes: Arno Hausser: piramide alimentar, Anglo: livro de pano, piramide alimentar e jogos, NEP: experiências de química e circula o sanguínea e Euclides da Cunha: maquetes e livros. Resultados: Analisando os questionários referentes às atividades desenvolvidas, pode-se concluir que a dura o das oficinas foi classificada como Adequada, assim como os recursos didáticos utilizados, sendo que os alunos-professores tiveram um desempenho classificado como ótimo. Por fim, considera-se que projeto trouxe novos conceitos para 98% deles, contribuindo, assim, para uma melhoria na educa o.
Radia o gama na conserva o do suco natural de laranja
Iemma Juliana,Alcarde André Ricardo,Domarco Rachel Elisabeth,Spoto Marta Helena Fillet
Scientia Agricola , 1999,
Abstract: Este trabalho estudou o efeito da radia o gama na popula o microbiológica, teor de sólidos solúveis, acidez titulável, pH and conteúdo de vitamina C do suco natural de laranja. A atividade microbiana pode causar a deteriora o do suco de laranja. A irradia o é um processo de conserva o de alimentos através da elimina o dos microrganismos, porém pode afetar algumas características do produto. O delineamento experimental foi em esquema fatorial 4x5 referentes ao controle mais 3 doses de radia o (2,0; 4,0 and 6.0 kGy) e 5 períodos de armazenamento (1, 7, 14, 21 e 28 dias) com 2 repeti es. As amostras de suco natural foram extraídas de laranjas da variedade "Pêra", irradiadas a uma taxa de dose de 2,0 kGy por hora (cobalto-60), e em seguida foram armazenadas sob refrigera o (5 ± 3oC). Os resultados mostraram pequenas varia es no teor de sólidos solúveis, acidez titulável e pH, em rela o aos tratamentos testados. A raz o sólidos solúveis/acidez titulável foi determinada e também mostrou pequena varia o em todos os tratamentos. Com o aumento da dose de radia o e o prolongamento do período de armazenamento houve redu o no conteúdo de vitamina C do suco. A radia o gama se mostrou eficaz na redu o da popula o microbiana do suco de laranja.
A determina??o do boro em plantas pelo método colorimétrico da curcumina
Alcarde, J.C.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1969, DOI: 10.1590/S0071-12761969000100004
Abstract: the determination of boron in vegetables by the curcumin colorimetric method is based on the formation of the rosocianin complex in acetic-sulphuric media. in this procedure the reaction takes place in solution at room temperature, needing not to control the temperature at 55 3°c, as with the common method in which the rubrocurcumin complex is formed. an aliquot of the vegetable extract is rendered alkiline by adding a solution of naoh and then dried over a vapor bath. to the residue is added a 0,125% curcumin acetic solution and a (1 + 1) acetic-sulphuric solution. the reaction is completed in 15 minutes. in the application of the method to plant materials analysis, several aspects were studied: interferents and their elimination, the recovery of boron from the ashed samples, the contamination due to filtration through paper filter, and the precision and accuracy of the method. among the normally found elements in vegetable aske, the one interfering were: ca2+, mg2+, fe3+, mn2+ and co2+. they were separated by passing the extract through cation exchange resin. the method, as described, may be considered efficient for the boron determination in vegetables, since it showed good precision and accuracy, coupled with high sensitivity, allowing the determination of as low as 2 ppm of boron in vegetables, within the limits of the least erros.
Solubilidade de micronutrientes contidos em formula??es de fertilizantes, em extratores químicos
Alcarde, J. C.;Vale, F.;
Revista Brasileira de Ciência do Solo , 2003, DOI: 10.1590/S0100-06832003000200016
Abstract: in brazilian legislation, the control for micronutrient concentrations in mineral fertilizers considers the total content. as a consequence, low-cost by-products and even industrial residues are generally used as a source for micronutrients, despite their low availability to plants. to evaluate fertilizer solubilities, water, citric acid 20 g l-1, and neutral ammonium citrate (1 + 9) extracting solutions were applied to mixtures containing micronutrients. the same study was realized for micronutrient sources. results were similar for both sources and mixtures. citric acid solution 20 g l-1 was the most promising option to evaluate micronutrient contents in fertilizer mixtures. from the agronomic point of view, the total content is an inadequate criterion for the determination of micronutrient contents in chemical fertilizers.
Solubilidade de micronutrientes contidos em formula es de fertilizantes, em extratores químicos
Alcarde J. C.,Vale F.
Revista Brasileira de Ciência do Solo , 2003,
Abstract: A legisla o brasileira adota o teor total para a garantia dos micronutrientes em fertilizantes. Isso permite a utiliza o de subprodutos de várias origens, baratos, mas que nem sempre apresentam os micronutrientes em formas disponíveis às plantas. Estudou-se a solubilidade dos micronutrientes em formula es de fertilizantes, utilizando os extratores água e solu es de ácido cítrico 20 g L-1 e citrato neutro de am nio (1 + 9), já usados na avalia o de matérias-primas. Os resultados foram semelhantes, tanto na avalia o das formula es como de matérias-primas, isto é, a solu o de ácido cítrico a 20 g L-1 possibilita avaliar, com mais seguran a, o conteúdo de micronutrientes em formula es de fertilizantes, representando uma alternativa para o teor total, que n o é um critério adequado, do ponto de vista agron mico, para avaliar os micronutrientes contidos em fertilizantes.
Diagnostics, rehabilitation and models of Parkinson’s disease  [PDF]
Juliana Dushanova
Health (Health) , 2012, DOI: 10.4236/health.2012.431178
Abstract: Diagnostics and rehabilitation of Parkinson’s disease (PD) presents the current information pertaining to etiology, early biomarkers for diagnostics, novel methods to evaluate symptoms, multidisciplinary rehabilitation, new applications of brain imaging and invasive methods to the study of PD. Researchers have only recently begun to focus on the non-motor symptoms of PD, which are poorly recognized and inadequately treated by clinicians. The non-motor symptoms of PD have a significant impact on patient quality of life and mortality, and include cognitive impairments, autonomic, gastrointestinal, and sensory symptoms. Indepth discussion of the use of imaging tools to study disease mechanisms is also provided, with emphasis on the abnormal network organization in parkinsonism. Deep brain stimulation management is a paradigm-shifting therapy for PD, essential tremor and dystonia. In the recent years, new approaches of early diagnostics, training programmes and treatments have vastly improved the lives of people with PD, substantially reducing symptoms and significantly delaying disability. PD results primarily from the death of dopaminergic neurons in the substantia nigra. Current PD medications treat symptoms; none halt or retard dopaminergic neuron degeneration. The main obstacle to developing neuroprotective therapies is a limited understanding of the key molecular mechanisms that provoke neurodegeneration. The discovery of PD genes has led to the hypothesis that misfolding of proteins and dysfunction of the ubiquitin-proteasome pathway are pivotal to PD pathogenesis. Previously implicated culprits in PD neurodegeneration, mitochondrial dysfunction and oxidative stress, may also act in part by causing the accumulation of misfolded proteins, in addition to producing other deleterious events in dopaminergic neurons. Neurotoxin-based models have been important in elucidating the molecular cas-cade of cell death in dopaminergic neurons. PD models based on the manipulation of PD genes should prove valuable in elucidating important aspects of the disease, such as selective vulnerability of substantia nigra dopaminergic neurons to the degenerative process.
"O pH de solu??es de ácido acético, cítrico, oxálico e tartárico"
Catani, R. A.;Alcarde, J. C.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1966, DOI: 10.1590/S0071-12761966000100015
Abstract: this paper reports the data obtained concerning the determination of ph of acetic acid, citric acid, oxalic acid and tartaric acid solutions from 0,005 m to 0,5 m. there is a linear relationship, between ph and pc log 1/c, where c is the concentration in molarity, of studied acids. on the other hand, the calculation of ph through a quadratic equation, using only the first thermodynamic constant, furnishes data very close to the determinated values. the calculated ph of acetic acid solutions (from 0,55 to 0,0055 m) of citric acid solutions (from 0,25 to 0,025 m) and of tartaric add solutions (from 0,25 to 0,05 m) through an equation of first degree, using only the first thermodynamic constant, gave results which are also very close to the determined ph value. it was possible to establish two equations for the line of regression of ph on pc for each acid. in the first equation the determined ph is the dependent variable and in the second equation the calculated ph is dependent variable. the independent variable in both equations is pc.
Método simplificado de solubiliza??o de amostras de calcários agrícolas para a determina??o de cálcio e do magnésio
Alcarde, J.C.;Barbin, D.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1978, DOI: 10.1590/S0071-12761978000100027
Abstract: two methods for solubilization of agricultural limestone samples for determination of calcium and magnesium were studied. one method, supported on vigorous acid digestion, is indicated for determination of the total of those elements; and another one, simple and rapid, is used in routine laboratories; both were applied to different granulometric fractions of the samples. the results, statisticaly analysed, did not show significative differences between both methods as well as between calcium and magnesium oxide percentages contained in the different granulometric fractions that compose the commercial limestones. the simplified solubilization method is indicated to characterize soluble calcium and magnesium oxides in agricultural limestones.
Determina??o do zinco e cobre em fertilizantes por espectrofotometria de absor??o at?mica
Alcarde, J. C.;Ponchio, C. O.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1972, DOI: 10.1590/S0071-12761972000100023
Abstract: the determinations of zinc and copper in fertilizers by atomic absorption spectrophotometry are not influenced by the concentration of hc1 in the extracts, in the range of 0,1 n to 0,5 n and neither by the anions phosphate, sulfate and nitrate in the same range of hc1 concentration. the methods are precise and accurate for the determinations of zinc and copper in fertilizers.
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