Consulta: subjectFacets:"Chemical analysis"
Registros recuperados: 55
Data/hora: 08/06/2024 13:58:14

Extracción de hidrocarburos y compuestos derivados del petróleo en suelos agrícolas de la  cuenca baja del río Tonalá.
Provedor de dados: 32
Autores: Pons Jiménez, Mirna.
El análisis de hidrocarburos en muestras de suelos, es una de las determinaciones más frecuentes en los estudios ambientales, de las zonas productoras de petróleo crudo. Una de las técnicas más utilizadas en el análisis de hidrocarburos de la fracción pesada del petróleo en suelos, es el método establecido en la Norma Oficial Mexicana NMX-AA-134-scfi-2006. Sin embargo, en el método se indica un mismo tiempo de extracción sin considerar las diferencias en las propiedades físicas y químicas del suelo. Por lo anterior, en este trabajo, se planteó optimizar el tiempo de extracción de compuestos derivados del petróleo mediante un sistema Soxhlet, en tres suelos con diferentes características físicas y químicas, empleando tres disolventes de polaridad diferente....
Palavras-chave: Análisis químico; Suelo; Contaminación; Petróleo crudo; Chemical analysis; Soil; Contamination; Crude oil; Maestría; Producción agroalimentaria en el trópico.
Ano: 2010
URL: http://hdl.handle.net/10521/78

Extracción de hidrocarburos y compuestos derivados del petróleo en suelos agrícolas de la  cuenca baja del río Tonalá.
Provedor de dados: 32
Autores: Pons Jiménez, Mirna.
El análisis de hidrocarburos en muestras de suelos, es una de las determinaciones más frecuentes en los estudios ambientales, de las zonas productoras de petróleo crudo. Una de las técnicas más utilizadas en el análisis de hidrocarburos de la fracción pesada del petróleo en suelos, es el método establecido en la Norma Oficial Mexicana NMX-AA-134-scfi-2006. Sin embargo, en el método se indica un mismo tiempo de extracción sin considerar las diferencias en las propiedades físicas y químicas del suelo. Por lo anterior, en este trabajo, se planteó optimizar el tiempo de extracción de compuestos derivados del petróleo mediante un sistema Soxhlet, en tres suelos con diferentes características físicas y químicas, empleando tres disolventes de polaridad diferente....
Palavras-chave: Análisis químico; Suelo; Contaminación; Petróleo crudo; Chemical analysis; Soil; Contamination; Crude oil; Maestría; Producción agroalimentaria en el trópico.
Ano: 2010
URL: http://hdl.handle.net/10521/78

El uso de tecnologías de la información en el desarrollo de un plan de manejo sustentable del acuífero del Valle de Guadalupe, B. C.
Provedor de dados: 32
Autores: Salgado Tránsito, Jorge Arturo.
El presente trabajo se realizó en la región del Valle de Guadalupe, municipio de Ensenada, Baja California, y consistió en la elaboración de un Plan de manejo sustentable del acuífero a partir del uso de tecnologías de la información. El plan de manejo servirá para equilibrar las extracciones con las recargas del acuífero del Valle de Guadalupe. La metodología llevada a cabo en la investigación partió de la elaboración del Sistema de Información Geográfica de la zona. Posteriormente se realizó una estimación de la descarga del acuífero mediante el censo de las extracciones observadas en campo, así como los gastos reportados para el uso urbano. Con la información obtenida y datos de las estaciones meteorológicas de influencia se determinó el balance general...
Palavras-chave: Sistemas de Información Geográfica; Balance hídrico; Análisis químico; Desalinización; GIS; Water balance; Chemical analysis; Desalination; Doctorado; Hidrociencias.
Ano: 2010
URL: http://hdl.handle.net/10521/321

Determination of the influence of the variation of reducing and non-reducing sugars on coffee quality with use of artificial neural network
Provedor de dados: 70
Autores: Messias,José A. T.; Melo,Evandro de C.; Lacerda Filho,Adílio F. de; Braga,José L.; Cecon,Paulo R.
The present study aimed at evaluating the use of Artificial Neural Network to correlate the values resulting from chemical analyses of samples of coffee with the values of their sensory analyses. The coffee samples used were from the Coffea arabica L., cultivars Acaiá do Cerrado, Topázio, Acaiá 474-19 and Bourbon, collected in the southern region of the state of Minas Gerais. The chemical analyses were carried out for reducing and non-reducing sugars. The quality of the beverage was evaluated by sensory analysis. The Artificial Neural Network method used values from chemical analyses as input variables and values from sensory analysis as output values. The multiple linear regression of sensory analysis values, according to the values from chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee quality; Chemical analysis; Classification; Computer systems.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000200015

Comparison of Resin, Mehlich-1 and Mehlich-3 extractants for phosphorus, in Coastal Tableland soils.
Provedor de dados: 14
Autores: SOBRAL, L. F.
bitstream/CPATC-2010/21024/1/bp-44.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Solo; Análise química; Chemical analysis; Soil.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/577088

Determinação de resíduos de paclobutrazol em manga (Mangifera indida L.) por cromatografia acoplada a espectometria de massas (LC-MS/MS).
Provedor de dados: 14
Autores: FERRACINI, V. L.; QUEIROZ, S. C. do N. de; ROSA, M. A.; LOPES, P. R. C.
Paclobutrazol (PBZ) é um regulador de crescimento que tem sido utilizado para alterar o ciclo fenológico da mangueira visando a produção de frutos em qualquer época do ano. É bastante utilizado na região nordeste do Brasil e a determinação dos resíduos na fruta é importante pois há pouco conhecimen- to sobre o acúmulo desta substância na planta em condições brasileiras. Para isso foi necessário adaptar um método analítico para determinar resídu- os de paclobutrazol em frutos de manga. Após a extração do PBZ na matriz o extrato foi analisado por LC-MS/MS. Os limites de detecção (LOD) e de quantificação (LOQ) obtidos para o PBZ foram de 0,25 ?g Kg-1 e 1,25 ?g Kg-1, respectivamente. As recuperações foram de 82 a 94% e se encontram dentro da faixa considerada...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: LC-MS/MS; Resíduos de paclobutrazol; Especrometria.; Resíduo químico; Regulador de crescimento; Análise química; Cromatografia; Manga.; Paclobutrazol; Chemical residues; Chemical analysis; Chromatography; Mass spectrometry.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/898423

Carência de macronutrientes em plantas de quina.
Provedor de dados: 14
Autores: VIEGAS, I. de J. M.; CARVALHO, J. G. de; ROCHA NETO, O. G. da; SANTIAGO, E. A. de.
bitstream/item/32781/1/CPATU-BP192.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Pará; Brasil; Quassia amara; Drug plants.; Análise Química; Deficiência Nutricional; Nutrição Vegetal; Planta Medicinal; Quina.; Amazonia; Chemical analysis; Nutrient deficiencies; Plant nutrition.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/374225

Técnicas eletroforéticas.
Provedor de dados: 14
Autores: MANDARINO, J. M. G.; VIDAURRE, T. J. C.
Fundamentos da tecnica: principios; Tipos de geis: geis de poliacrilamida, geis de amido; Processo eletroforetico; Tecnicas eletroforeticas: eletroforese em geis descontinuos; Eletroforese em geis acrilamida e SDS; Eletroforese em feis de agarose e acrilamida; Eletroforese bi-dimentsional ou de focalizacao isoeletrica; Eletroforese capilar; Deteccao de macromoleculas separadas pela eletroforese: coloracao com "coomassie blue", Coloracao com nitrato de prata, Tecnicas fluorescentes, Visualizacao de enzimas atraves de reacoes com substratos especificos, Visualizacao de macromoleculas, Deteccao de macromoleculas radioativas.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Analises quimicas; Brasil.; Eletroforese.; Brazil; Chemical analysis; Electrophoresis.
Ano: 1995
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445803

Caracterização botânica e química de três espécies do gênero piper no Acre.
Provedor de dados: 14
Autores: SILVA, A. C. P. R. da; OLIVEIRA, M. N. de.
A pimenta longa (Piper hispidinervum) produz óleos essenciais ricos em safrol, um fenil éter que ocorre como componente volátil, sendo utilizado como precursor na fabricação de inseticidas biodegradáveis, cosméticos e produtos farmacêuticos. Existem dúvidas com relação à identificação botânica das espécies de Piper produtoras de safrol, podendo ser Piper hispidinervum ou Piper aduncum. O Banco Ativo de Germoplasma de Piper da Embrapa Acre possui acessos de 11 municípios do estado do Acre. O material foi coletado, prensado e seco, e as amostras enviadas ao Jardim Botânico do Rio de Janeiro para classificação e ao Museu Paraense Emilio Goeldi para análise química. Foram identificadas três espécies de Piper: hispidinervum, hispidum e aduncum, com médias de...
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Classificação botânica; Acre; Amazônia Ocidental; Classificação de planta; Aceites essenciales; Análisis químico; Composición botánica; Safrol.; Óleo essencial; Análise Química; Pimenta Longa; Piper Hispidinervum.; Piper longum; Piper hispidum; Essential oils; Safrole; Chemical analysis; Botanical composition; Piper aduncum.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/495193

Validação de um método para determinação de resíduos de fungicidas em grãos de soja.
Provedor de dados: 14
Autores: QUEIROZ, S. C. do N. de; SOUZA, D. R. C. de; CERDEIRA, A. L.; PARAIBA, L. C.
O cultivo de soja utiliza diversos tipos de fungicidas para controlar fungos fitopatogênicos, que, dependendo das características físico-químicas das moléculas, podem se acumular nos grãos e causar riscos à saúde humana. Desse modo, para verificar a presença de resíduos destas substâncias nesta matriz alimentar há necessidade de desenvolver e validar métodos analíticos que sejam sensíveis e confiáveis. Assim, o objetivo deste trabalho foi adaptar e validar um método para a determinação dos fungicidas não-iônicos ciproconazol, epoxiconazol, piraclostrobina e azoxistrobina em grãos de soja, para ser aplicado na validação de um modelo matemático cinético de bioconcentração, a fim de prever o acúmulo desses agrotóxicos nesse alimento. O método analítico...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mass spectroscopy; Soybean; Fungicida; Resíduo químico; Análise química; Soja; Cromatografia gasosa; Fungicides; Chemical residues; Chemical analysis; Chromatography.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1090496

Amostragem do solo para analise quimica.
Provedor de dados: 14
Autores: MIRANDA, L. N. de.
bitstream/item/98808/1/cirtec-11.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Classificação.; Análise; Amostragem; Análise Química; Química; Solo.; Analytical methods; Chemical analysis; Soil.; Sampling.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549428

PAQLF: Programa de análise de qualidade de laboratórios de fertilidade: 30 anos.
Provedor de dados: 14
Tipo: Folders
Palavras-chave: PAQLF; Análise química do solo; Fertilidade; Soil fertility; Soil analysis; Chemical analysis.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1021883

Capacitação em espectroscopia no infravermelho próximo, tratamento de dados, aspectos práticos e aplicações analíticas: anais...
Provedor de dados: 14
Autores: WORKSHOP DA REDE NIR EMBRAPA, 3., 2013, Sete Lagoas.
O 3º Workshop da Rede NIR Embrapa: Capacitação em Espectroscopia no Infravermelho Próximo, Tratamento de Dados, Aspectos Práticos e Aplicações Analíticas, foi uma ação do Projeto Macroprograma 05 - Rede NIR Embrapa. O Workshop foi realizado em Sete Lagoas-MG, no período de 3 a 5 de setembro de 2013 e contou com a participação de 35 profissionais entre empregados da Embrapa, bolsistas e professores de Universidades. O Workshop teve como objetivo ampliar e atualizar os conhecimentos dos empregados da Embrapa que são usuários da técnica de espectroscopia no infravermelho próximo, com vistas ao aumento das parcerias institucionais para utilização dessa importante técnica analítica. Objetivo esse que vem incentivar a aplicação dos princípios da química verde e...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Química analítica; Laboratory; Laboratório; Química; Análise química; Chemical analysis; Analytical chemistry.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1012128

Controle de Qualidade da Própolis.
Provedor de dados: 14
Autores: BARRETO, A. L. H.; LOPES, M. T. do R.; PEREIRA, F. de M.; SOUZA, B. de A.
Própolis: definição e características; Elaboração e utilização da própolis; Composição da própolis; Produção da própolis; Controle de qualidade da própolis; Preparo de amostras de própolis para realização de análises físico-químicas; Obtenção do extrato etanólico de própolis por Soxhlet; Análises Físico-químicas; Perda por dessecação (umidade); Determinação de cinzas (material mineral); Massa mecânica (resíduo insolúvel em etanol); Determinação de cera; Determinação de compostos fenólicos pelo método de Folin-Denis; Determinação do teor de flavonoides; Determinação da atividade de oxidação (índice de oxidação); Determinação de resíduo seco (solúveis em etanol).
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Análise físico-química; Própolis; Sistema de Produção; Controle de Qualidade; Honey and bee products; Chemical analysis; Quality control.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1128584

Determinação de compostos antioxidantes nos frutos de camu-camu.
Provedor de dados: 14
Autores: COHEN, K. de O.; MONTE, D. de C.; PAES, N. S.; RIBEIRO, S. I.
bitstream/item/75819/1/bolpd-266.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Camu-camu; Indigenous organisms; Tropical fruit; Peel analysis; Pulp analysis; Vitamin C; Antioxidant.; Fruta Tropical; Myrciaria Dubia; Vitamina C.; Chemical analysis; Polyphenols.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/883953

Uso obrigatorio do Sistema Internacional de Unidades em resultados de analises quimicas, fertilidade de solos e nutricao vegetal.
Provedor de dados: 14
Autores: MESQUITA FILHO, M. V. de; SOUZA, A. F.
Tabela de transformacao de unidades.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Sistema International de Unidades; Internacional System Units.; Análise Química; Solo.; Chemical analysis; Soil.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/770030

Avaliação da fertilidade dos solos do Distrito Federal.
Provedor de dados: 14
Autores: MOREIRA, G. N. C.; BLOISE, R. M.; GOMES, I. A.; DYNIA, J. F.
O SNLCS tem procurado ampliar o alcance e a utilização prática, dos dados obtidos através dos levantamentos de solos que realiza. Prosseguindo as pesquisas que objetivam a elaboração do mapa de solos do Brasil a nível de reconhecimento, esta entidade vem complementando seus trabalhos com mapas de aptidão agrícola das terras, em relação com diferentes tipos de manejo e culturas. Dentro dos parâmetros usados para definir a aptidão agrícola dos solos, a fertilidade e o mais facilmente controlável e aquele cuja alteração modifica mais sensivelmente a produtividade das terras. Por outro lado, os mapas de aptidão, pela sua natureza, não mostram claramente as limitações de uso devido unicamente ao nível de fertilidade das terras. Tal informação é de grande...
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Fertilidade do Solo; Análise Química; Soil fertility; Chemical analysis.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/327957

Contamination chimique du milieu marin : de la mesure à l'évaluation des risques
Provedor de dados: 5
Autores: Abarnou, Alain.
This activity report entitled (“Chemical contamination of the marine environment: from measurement to risk assessment”) summarizes the main stages my career at Ifremer from November 1975 to june 2013. The first chapter deals with the seawater chlorination and chlorinated waters released into the sea, the identification and the conditions of the formation of various by-product of these processes. The second chapter concerns PCBs, their nature, their chemical analysis in environmental matrices. PCBs are considered as the best examples of persistant and bioaccumulable compounds and therefore, in all this report they are flagship contaminants to which other groups of studied substances are compared. The third chapter refers to studies performed within marine...
Tipo: Text
Palavras-chave: Chlore; Chloration de l’eau de mer; Oxydant; Bromoforme; Impact environnemental; Mécanismes réactionnels; Désinfection; Polluants organiques persistants (POP); PCB; Dioxines; HAP; PBDE; Chlordécone; Baie de Seine; Organismes marins; Moules; Poissons; Surveillance environnementale; Analyse; Bioaccumulation; Chlorine; Seawater chlorination; Oxidizing agent; Bromoform; Environmental impact; Reaction mechanisms; Disinfection; Persitsent organic pollutants (POPs); PCBs; Dioxins; PAHs; PBDEs; Chlordecone (kepone); Baie de Seine; Marine organisms; Mussel; Fish; Environmental monitoring; Chemical analysis; Bioaccumulation.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00168/27946/26237.pdf

Determinación de la concentración de hidrocarburos en las aguas superficiales y sedimentos y su relación con Capitella capitata para conocer la contaminación del estuario del Río Chone
Provedor de dados: 20
Autores: Paredes, P.
Durante mayo a octubre del 2007 abarcando la época seca y lluviosa, se realizaron análisis para la determinación de hidrocarburos aromáticos totales existentes en agua y sedimentos dentro del estuario del Río Chone mediante la técnica de CARIPOL; los análisis fueron realizados en el Instituto Oceanográfico de la Armada. Dentro del estuario se tomaron 4 estaciones cada una de ellas con un punto de referencia: Estación 1:Isla Corazón, Estación 2: Mangle 2000, Estación 3: Capitanía de Puerto, Estación 4: Repsol. Las muestras fueron tomadas una vez al mes; tomando en cuenta la radiación solar y mareas como variables para el estudio. La concentración de hidrocarburos aromáticos totales disueltos y dispersos en el agua fue entre 0.05-0.329 ug/L, el valor más...
Tipo: Journal Contribution
Palavras-chave: Aromatic hydrocarbons; Sediments; Chemical analysis; Indicator species; Pollution legislation.
Ano: 2010
URL: http://hdl.handle.net/1834/4217

Efecto de diferentes concentraciones de cal viva en el comportamiento de la calidad del agua en el cultivo de camarón
Provedor de dados: 20
Autores: Ceballos, B.J.; Cabrera, J. E; Galindo, J.
When evaluating the behavior of the physical, chemical and biological variables of the  water during the first 24 hours where different concentrations of  lime were applied (50,  75 and 100 mg/L) to different salinities (15 and 30 ups) to the cultivation water,   the  analysis  factorial  showed the existence of an interaction of second order among the  concentration of lime, the salinity and the time for the ammonium concentration, the pH  and the one oxygenates dissolved, while for the temperature they registered  interactions of first order for time x salinity, and time x concentration of alive lime. The  quality of the cultivation water improved when diminishing the salinity and to increase  the concentrations of lime. A preliminary analysis indicates...
Tipo: Preprint
Palavras-chave: Marine shrimp culture; Biological culture; Chemical analysis.
Ano: 2011
URL: http://hdl.handle.net/1834/4148

Características químicas de las aguas del Estrecho Bransfield-Islas Shetland del sur
Provedor de dados: 20
Autores: Valencia Trejo, M.
El presente trabajo brinda información detallada de las concentraciones de parámetros químicos, oxígeno disuelto y micronutrientes inorgánicos, fosfato, nitrito, nitrato y silicato, de las aguas del Estrecho Bransfield, a partir del análisis químico de las muestras de agua obtenidas durante la Primera Expedición Ecuatoriana a la Antártica a bordo del BAE ORION del Instituto Oceanográfico de la Armada del Ecuador. Las muestras se tomaron en el lapso comprendido entre el 8 y el 25 de enero de 1988, utilizando para ello una roseta multimuestreadora, realizándose el análisis de oxígeno disuelto por el método de Winkler y los elementos nutritivos, utilizando los métodos descritos en el Manual de Strickland y Parsons. Para el análisis de la información se...
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Dissolved oxygen; Nutrients (mineral); Chemical analysis; Dissolved oxygen; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 1989
URL: http://hdl.handle.net/1834/3870

Análisis de residuos de organoclorados en los sedimentos de zonas de manglar en la Ciénaga Grande de Santa Marta y la Bahía de Chengue, Caribe colombiano
Provedor de dados: 20
Autores: Espinosa, Luisa F.; Ramírez, Gustavo; Campos, Néstor H.
En los sedimentos superficiales aledaños al manglar, de cuatro estaciones dentro de la Ciénaga Grande de Santa Marta y una estación en la Bahía de Chengue, se analizaron las concentraciones de seis residuos de plaguicidas organoclorados (lindano, heptacloro, aldrin, pp'DDE, pp'DDD y pp'DDT), mediante la técnica de cromatografía gas-líquido. Se realizaron muestreos trimestrales entre marzo y diciembre de 1993, tratando de abarcar las principales épocas climáticas de la región (seca, lluviosa menor, seca menor y lluviosa mayor). Mediante análisis de varianza multifactorial se encontraron diferencias significativas solamente en las concentraciones de lindano, heptacloro y pp'DDE, entre las diferentes épocas climática; los otros tres compuestos (aldrin, pp'DDD...
Tipo: Journal Contribution
Palavras-chave: Ecology; Chemical analysis; Salinity effects; Gas chromatography; Organic matter; Coastal lagoons; Estuaries; Mangroves; Ecology; Organic matter; Estuaries; Gas chromatography; Coastal lagoons; Mangroves; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_11097; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 1999
URL: http://hdl.handle.net/1834/3804

Ad hoc Session of the IODE Group of Experts on Biological and Chemical Data Management and Exchange Practices (GE-BICH), 25 October, Ostend, Belgium
Provedor de dados: 20
Supported by IOC/IODE
Tipo: Report
Palavras-chave: Biological data; Chemical analysis; Chemical oceanography.
Ano: 2012
URL: http://hdl.handle.net/1834/4764

Effet de l’addition du thym, du laurier et du romarin sur la conservation de l’anguille fumée
Provedor de dados: 20
Autores: Zerai, T.; Mestiri, F.; Romdhane, M.S.; Mejri, S.
L’effet  de l’addition de trois types d’additifs naturels: le thym (Thymus vulgaris), le laurier (Laurus nobilis) et le romarin (Rosmarinus officinalis) sur l’amélioration de la conservation de l’anguille fumée a été étudié. Une comparaison des caractéristiques microbiologiques, physicochimiques et organoleptiques du produit, par rapport au lot témoin, fumé sans additifs a été réalisée durant 5 semaines à 4 °C. Nous avons trouvé que l’addition du thym, a permit  une réduction de la flore aérobie mésophyte totale (FAMT), a ralenti  la formation de l’azote basique volatil total (ABVT), et a permit  une réduction  de l’oxydation de la matière grasse. Le lot ainsi traité, a été très apprécié par les dégustateurs, et le thym a eu un effet améliorateur sur le...
Tipo: Journal Contribution
Palavras-chave: Chemical analysis; Cured products; Microbiological analysis; Processing fishery products; Quality; Storage life; Taste tests; Anguilla anguilla; Laurus nobilis; Rosmarinus officinalis; Http://aims.fao.org/aos/agrovoc/c_41152; Http://aims.fao.org/aos/agrovoc/c_4227; Http://aims.fao.org/aos/agrovoc/c_6660.
Ano: 2006
URL: http://hdl.handle.net/1834/4278

Polycyclic aromatic hydrocarbons and aromatic plasticiser materials in the sea water of alexandria coastal area
Provedor de dados: 20
Autores: Emara, H.I.; El-Deeb, M.K.Z.
Polycyclic aromatic hydrocarbons (PAHs), the real contaminants of petroleum, were detected in the surface seawater of Alexandria coastal area in winter and spring seasons of 1995. Their order of predominance, particularly for the individual components were principally due to the processes of input, transport and fluxes. Variation of PAHs was not following seasonal changes but it was slightly affected by partial dissolution of the lowerboiling aromatic hydrocarbons. The most abundant component of aromatic hydrocarbons was pyrene (PAH),112ngI-1 followed by naphthalene(56ngI-1) and its alkylated derivatives (dicyclic), then phenanthrene(14ngI-1) and its methylated derivatives (tricyclic). The potential fish carcinogenic PAH, dibenz [a &amp; c] anthracene was...
Tipo: Journal Contribution
Palavras-chave: Chemical analysis; Environments; Marine environment; Marine pollution; Oil pollution; Marine environment; Environment; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_2593.
Ano: 2005
URL: http://hdl.handle.net/1834/1217

IODE Group of Experts on Biological and Chemical Data Management and Exchange Practices (GE-BICH) Fifth Session IOC Project Office for IODE Oostende, Belgium 17-20 January 2011
Provedor de dados: 20
Supported by IOC for UNESCO.
Tipo: Report
Palavras-chave: Biological data; Chemical analysis.
Ano: 2011
URL: http://hdl.handle.net/1834/4326

Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier.
Provedor de dados: 20
Autores: Dartige, A.Y.
Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites...
Tipo: Other
Palavras-chave: Chemical analysis; Copper; Environmental conditions; Iron; Mercury; Size; Zinc; Copper; Iron; Environmental conditions; Mercury; Size; Zinc; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_3950; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8517.
Ano: 1999
URL: http://hdl.handle.net/1834/1225

Florecimiento de microalgas relacionado con mortandad masiva de peces en el complejo lagunar Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Mancera-P., José E.; Vidal-V., Luis A.
Entre los meses de julio y agosto de 1994 un fenómeno discontinuo de muerte masiva de peces se registró en aguas del complejo lagunar de la Ciénaga Grande de Santa Marta, Colombia. El primer evento se presentó del 15 al 19 de julio, el segundo alrededor del día 20 de agosto y el tercero entre el 26 y 31 del mismo mes. La presencia en altas concentraciones de la cianofita filamentosa Cf. Anabaenopsis sp., registrada en la literatura como altamente tóxica, podría estar relacionada con las causas del primer evento. Un incremento en las concentraciones de fósforo, y un posterior florecimiento de nano y picoplancton, especialmente cianofíceas y algas flageladas, explicaría en parte las condiciones hipóxicas y anóxicas observadas en el tercer evento, las cuales...
Tipo: Journal Contribution
Palavras-chave: Ecology; Phytoplankton; Chemical analysis; Environmental impact; Coastal lagoons; Estuaries; Ecology; Phytoplankton; Environmental impact; Estuaries; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1994
URL: http://hdl.handle.net/1834/3787

Alteraciones físico-químicas de la columna de agua, generadas por el uso del Boliche (Método de Pesca Artesanal) en la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Rueda, Mario E.; Mancera-Pineda, José E.
Con el propósito de evaluar los impactos generados por el uso de un método de pesca artesanal denominado "boliche" en la laguna costera tropical Ciénaga Grande de Santa Marta, se cuantificaron diferentes aspectos; uno de los cuales fue orientado a analizar algunas alteraciones físico-químicas de la columna de agua, producidas durante la maniobra de pesca. Se determinó la concentración de oxígeno disuelto, la transparencia del agua y la concentración y composición del seston, antes y después de 70 lances de boliche. Los resultados indican que la maniobra de pesca genera algunos cambios momentáneos de poca repercusión en el ecosistema, tales como resuspensión de partículas principalmente inorgánicas, aumento de la concentración de seston y en consecuencia...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Chemical analysis; Environmental impact; Ecology; Estuarine fisheries; Dissolved oxygen; Seston; Fishing gear; Ecology; Estuaries; Environmental impact; Estuarine fisheries; Dissolved oxygen; Coastal lagoons; Seston; Fishing gear; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2674; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_6998; Http://aims.fao.org/aos/agrovoc/c_2946.
Ano: 1995
URL: http://hdl.handle.net/1834/3774

Amnesic Shellfish Poisoning (ASP)
Provedor de dados: 20
Autores: Ravn, H.
In this manual a review is provided of the chemical and toxicological aspects of Amnesic Shellfish Poisoning (ASP). The document contains information on chemical structure, chemical data, where to obtain standards and reference materials, the origin and occurrence, chemical analysis, mouse bioassay, epidemiology, mechanisms of action, symptoms and therapeutics. The practical use of this document has been highlighted in agreement with the Members of the Task Team on Aquatic Biotoxins. This document is prepared by Dr. H. Ravn, IOC together with Prof. T. Yasumoto, Tohoku University, Japan, Chairman of the Task Team on Aquatic Biotoxins. Dr. J. Ramsdell, National Oceanic and Atmospheric Administration (NOAA), Charleston Laboratory, USA has supplied parts of...
Tipo: Report
Palavras-chave: Fish intoxication; Poisonous organisms; Fish diseases; Shellfish; Epidemiology; Chemical analysis; Shellfish; Fish diseases; Epidemiology.
Ano: 1995
URL: http://hdl.handle.net/1834/2799

Estudio de impacto ambiental en Punta Fort William, verano austral: 1995-1996, 1997-1998
Provedor de dados: 20
Autores: Valencia T., M.
Durante los veranos australes de 1995-1996 y 1997-1998 se llevó a cabo, en Ensenada Guayaquil, cuerpo de agua aledaño a Punta Fort William, Isla Greenwich, del archipiélago de las Shetland del Sur, lugar del asentamiento de la Estación Científica "Pedro Vicente Maldonado", estudios químicos de la calidad de las aguas tendientes a determinar el eventual impacto que las actividades humanas pudieran ocasionar sobre tal ecosistema. Se presenta información acerca de las condiciones de oxigenación de las aguas, temperatura y salinidad de las mismas, la capacidad nutricia en relación con la concentración de micronutrientes inorgánicos así como información acerca de la presencia de hidrocarburos del petróleo disueltos y dispersos y, para establecer la efectividad...
Tipo: Journal Contribution
Palavras-chave: Environmental impact; Water quality; Hydrocarbons; Waste water; Dissolved oxygen; Chemical analysis; Environmental impact; Water quality; Waste water; Dissolved oxygen; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24927; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_3719.
Ano: 1998
URL: http://hdl.handle.net/1834/3850

Estudio de las características físicas y químicas de las aguas de Bahía Chile para el verano austral período 1995-1998
Provedor de dados: 20
Autores: Valencia T., M.
Se presenta un estudio de las características hidroquímicas de las aguas de Bahía Chile, para los veranos de 1995 y 1998, basado en la distribución horizontal de la concentración de parámetros físicos y químicos determinada en muestras de agua obtenidas en nueve estaciones localizadas en tres perfiles perpendiculares a las costas de la bahía, considerando tanto las aguas de la desembocadura, cuanto la parte central e interior de la misma. Las muestras fueron obtenidas a dos niveles, desde la superficie hasta treinta metros donde la profundidad lo permitió. El análisis efectuado indica la presencia de aguas con temperaturas congruentes con el área y la estación (verano); muy bién oxigenadas, con salinidad un tanto baja como producto del aporte del deshielo...
Tipo: Journal Contribution
Palavras-chave: Chemical composition; Chemical analysis; Water temperature; Phosphates; Polar waters; Chemical composition; Water temperature; Phosphates; Http://aims.fao.org/aos/agrovoc/c_1794; Http://aims.fao.org/aos/agrovoc/c_16063; Http://aims.fao.org/aos/agrovoc/c_35986.
Ano: 1998
URL: http://hdl.handle.net/1834/3847

Variación de lipoproteínas con cambios de temperatura en un grupo poblacional
Provedor de dados: 20
Autores: Andrade, P.; Aguirre, F.
La variación interindividual de los niveles de lípidos en el transcurso de la vida del hombre, producto de disbalance entre el ingreso y eliminación de estos elementos contenidos en las dietas, han determinado que las enfermedades cardiovascular ocupen los primeros sitiales como causa de muerte a nivel mundial, sumados a otros factores de riesgo como el tabaquismo, alcoholismo y vida sedentaria. La demostración más conveniente ha sido, a facilidad de causar arterioesclerosis en las especies animales suministrando dietas ricas en grasas saturadas; igualmente la microscopía electrónica ha demostrado la presencia de vacuolas lipídicas en cortes de arterias coronarias en niños de corta edad. Se estudió en un grupo poblacional considerado sano, la variación del...
Tipo: Journal Contribution
Palavras-chave: Lipoproteins; Chemical analysis; Air temperature; Risks; Lipoproteins; Air temperature; Http://aims.fao.org/aos/agrovoc/c_4367; Http://aims.fao.org/aos/agrovoc/c_230.
Ano: 1998
URL: http://hdl.handle.net/1834/3848

Amnesic Shellfish Poisoning (ASP)
Provedor de dados: 20
Autores: Ravn, H.
In this manual a review is provided of the chemical and toxicological aspects of Amnesic Shellfish Poisoning (ASP). The document contains information on chemical structure, chemical data, where to obtain standards and reference materials, the origin and occurrence, chemical analysis, mouse bioassay, epidemiology, mechanisms of action, symptoms and therapeutics. The practical use of this document has been highlighted in agreement with the Members of the Task Team on Aquatic Biotoxins. This document is prepared by Dr. H. Ravn, IOC together with Prof. T. Yasumoto, Tohoku University, Japan, Chairman of the Task Team on Aquatic Biotoxins. Dr. J. Ramsdell, National Oceanic and Atmospheric Administration (NOAA), Charleston Laboratory, USA has supplied parts of...
Tipo: Book
Palavras-chave: Fish intoxication; Poisonous organisms; Fish diseases; Shellfish; Epidemiology; Chemical analysis; Shellfish; Fish diseases; Epidemiology; Http://aims.fao.org/aos/agrovoc/c_7033; Http://aims.fao.org/aos/agrovoc/c_2920; Http://aims.fao.org/aos/agrovoc/c_2615.
Ano: 1995
URL: http://hdl.handle.net/1834/2799

Estudios químicos y bacteriológicos del río Baradero (Argentina): calidad sanitaria del agua y aptitud de los peces para consumo humano
Provedor de dados: 20
Autores: Costagliola, M.; Seigneur, G.N.; Jurquiza, V.
As a result of an agreement signed by the Municipal Government of Baradero Buenos Aires Province, Argentina and the INIDEP, the sanitary quality of the Baradero River waters was studied and fish safety assessed. Results of five field surveys carried out between 1993 and 1997 are studied. Organochlorine and organophosphorate pesticide residues, as well as traces of heavy metals were analyzed in 49 fish specimens and aerobic heterotrophic bacteria (AHB), total coliform bacteria (TC) and fecal coliform bacteria (FC) were counted out in 7 sampling stations placed on the coast and the riverbed. Alpha Hexachlorohexane, gamma Hexachlorohexane, beta Hexachlorohexane, Aldrin, Heptachlor epoxide, pp'DDE and Dieldrin were detected in fish tissues. The values of AHB...
Tipo: Journal Contribution
Palavras-chave: Freshwater pollution; Pollution surveys; Chemical analysis; Water analysis; Microbiological analysis; Pesticides; Public health; Pathogenic bacteria; Pesticides; Public health; Water analysis; Microbiological analysis; Pathogenic bacteria; Http://aims.fao.org/aos/agrovoc/c_5739; Http://aims.fao.org/aos/agrovoc/c_6349; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_25302; Http://aims.fao.org/aos/agrovoc/c_34317.
Ano: 2003
URL: http://hdl.handle.net/1834/2417

A comparison of fast destruction methods for the determination of trace metals in biological materials
Provedor de dados: 27
Autores: Luyten, S.; Smeyers-Verbeke, J.; Massart, D.L.
In clinical chemistry it can be very useful to have a rapid method for the determination of trace elements in biological material available. Because the classical wet digestion method which is generally used for the destruction of biological materials requires much attention, two procedures were tried which should be less time consuming or require less attention. The two new procedures which are the soluene (a quaternary ammonium hydroxide) method of Jackson (1) and the method of Adrian (2) utilizing pressure were applied to the determination of Cu and Zn in human brain tissue and in fish meal by atomic absorption spectroscopy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical analysis; Trace metals.
Ano: 1973
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3474

Determination of methylmercury in biological samples by semiautomated headspace analysis
Provedor de dados: 27
Autores: Decadt, G.; Baeyens, W.F.J.; Bradley, D.; Goeyens, L.
Gas-liquid distribution coefficients of methylmercury halides dissolved in water or benzene have been assessed by using a headspace injection system coupled to a gas chromatograph-microwave-induced plasma system. Vapor concentrations decreased in the following order: CH&lt;sub&gt;3&lt;/sub&gt;HgI &gt; CH&lt;sub&gt;3&lt;/sub&gt;HgBr &gt; CH&lt;sub&gt;3&lt;/sub&gt;HgCl. To transform all methylmercury iodide, iodoacetic acid (IAc) is used as the liberating agent. Methylmercury iodide degradation is prevented by the addition of sodium thiosulfate (0.05 M). The results obtained with internal standard addition are not influenced by other volatile compounds including other mercury compounds. The method has been applied to a series of biological samples. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analytical techniques; Chemical analysis; Mercury compounds.
Ano: 1985
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3198

Mild and Moderate Extraction Methods to Assess Potentially Available Soil Organic Nitrogen
Provedor de dados: 90
Autores: Braos,Bruno Boscov; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Braos,Lucas Boscov; Barbosa,José Carlos.
ABSTRACT The use of chemical methods to assess the soil organic nitrogen (N) potentially available to plants is not a common practice in Brazil. However, associated with others, this tool might improve efficiency in the use of waste and nitrogen fertilizers. In our study, chemical methods were tested to assess potentially available soil N in samples of 17 representative soils of the western plateau of the state of São Paulo (10 Oxisols and 7 Ultisols). Available soil N was extracted from the collected soil samples using moderate (ISNT-Illinois Soil Nitrogen Test) and mild (hot water and heated solutions of 2 mol L-1 KCl and 0.01 mol L-1 CaCl2) extraction methods. The levels of potentially available N obtained from these chemical methods were correlated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical analysis; Organic matter; Mineralization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100422

EFFECT OF LIQUID COW MANURE ON CHEMICAL AND BIOLOGICAL PROPERTIES IN AN ANDISOL
Provedor de dados: 127
Autores: Aguilera,Paula; Briceño,Gabriela; Mora,María de la Luz; Demanet,Rolando; Palma,Graciela.
The aim of this work was to establish the effect of the dose of liquid cow manure (LCM) on some chemical properties and biological activity in an Andisol. This study was carried out under laboratory conditions using an Andisol and LCM from a dairy farm located in the South of Chile. The dose of LCM were the equivalent to 0 (SO), 100 (S100), 200, (S200) and 300 (S300) thousand L ha-1. This amount is equivalent to regular agronomic LCM applications. The chemical characterization indicated that the LCM addition modified all the tested Andisol chemical properties. These begin to return to the initial conditions from 10 days on, with the exception of EC, K and DOC. The C-C0(2) evolution indicated that LCM incorporation at increasing dose enhanced the...
Tipo: Journal article
Palavras-chave: Liquid amendment; Biological activities; Chemical analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200007

Oxisol subsurface chemical attributes related to sugarcane productivity
Provedor de dados: 63
Autores: Landell,Marcos Guimarães de Andrade; Prado,Hélio do; Vasconcelos,Antônio Carlos Machado de; Perecin,Dilermando; Rossetto,Raffaella; Bidoia,Márcio Aurélio Pitta; Silva,Marcelo de Almeida; Xavier,Mauro Alexandre.
In spite of the great homogeneity found in the morphological characteristics of Oxisols, there is great chemical diversity in subsurface layers of these soils. Studies indicate that crop yield presents significant correlation with the chemical attributes of the subsurface, which, are more stable than attributes found in the plough layer, subject to greater alterations as a consequence of agricultural exploration. This work evaluated the effects of subsurface chemical attributes of Oxisols of the South Central region of Brazil, on the yield of sugarcane clones and of variety RB72454, during the first, second and third cropping cycles. Productivity data were obtained between 1993 and 1998. Soils were characterized in terms of their mechanical analysis and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yield; Soils; Linear models; Chemical analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400020

Nutrient content of biomass components of Hamlin sweet orange trees
Provedor de dados: 63
Autores: Mattos Jr.,Dirceu; Quaggio,José Antônio; Cantarella,Heitor; Alva,Ashok Kumar.
The knowledge of the nutrient distribution in trees is important to establish sound nutrient management programs for citrus production. Six-year-old Hamlin orange trees [Citrus sinensis (L.) Osb.] on Swingle citrumelo [Poncirus trifoliata (L.) Raf. x Citrus paradisi Macfad.] rootstock, grown on a sandy Entisol in Florida were harvested to investigate the macro and micronutrient distributions of biomass components. The biomass of aboveground components of the tree represented the largest proportion of the total. The distribution of the total tree dry weight was: fruit = 30.3%, leaf = 9.7%, twig = 26.1%, trunk = 6.3%, and root = 27.8%. Nutrient concentrations of recent mature leaves were in the adequate to optimal range as suggested by interpretation of leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Mineral nutrition; Dry matter; Chemical analysis; Nutrient distribution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100023

ระดับของคาร์โบไฮเดรทและไนโตรเจนในช่วงการเกิดรากของกิ่งตัดชำ กีวีพันธุ์ Bruno
Provedor de dados: 106
Autores: Thawatchai Chinnawong.
Thesis (M.Sc. in Agriculture)
Tipo: PhysicalObject
Palavras-chave: Kiwi; Actinidia chinensis Planch.; Bruno; Stem cuttings; Carbohydrate; Nitrogen; Chemical analysis; Root formation; กีวี; พันธุ์บรูโน; กิ่งตัดชำ; คาร์โบไฮเดรท; ไนโตรเจน; การวิเคราะห์ทางเคมี; การเกิดราก.
Ano: 1981
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5517

Evaluation on food qualities and nutrient content by chemical analysis red colour sorghum inbred line for animal feed products or genetic based
Provedor de dados: 106
Autores: Yupin Boon-ampol.
3 tables
Palavras-chave: Sorghum; Inbred line; Food quality; Nutrient content; Chemical analysis; Animal feed; Genetic based; ข้าวฟ่าง; คุณค่าทางอาหาร; องค์ประกอบทางเคมี; อาหารสัตว์; ข้าวฟ่างแดง; สายพันธุ์แท้.
Ano: 1989
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4380

Maize properties for industrial uses
Provedor de dados: 106
Autores: Sukoncheun Sringam; Rasamee Supasri.
5 tables
Palavras-chave: Corn; Maize; Varieties; Physical properties; Chemical analysis; Water absorption; Kernel density; Amylose content; ข้าวโพด; คุณสมบัติทางกายภาพ; คุณสมบัติทางเคมี; อะไมโลส; ความหนาแน่นของเมล็ด; ปริมาณ; การดูดซับน้ำ.
Ano: 1983
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4155

Technical and economic viability and nutritional quality of mombasa guinea grass silage production
Provedor de dados: 1
Autores: Galindo, Fernando Shintate; Beloni, Tatiane; Buzetti, Salatier; Teixeira Filho, Marcelo Carvalho Minhoto; Dupas, Elisângela; Ludkiewicz, Mariana Gaioto Ziolkowski.
The objective of this study was to evaluate the viability of pasture with high production capacity and the potential for production of silage using different sources and doses of nitrogen (N) by quantifying the productivity of dry matter (DM), some qualitative characteristics, the total cost of production (TC) and total operating cost (TOC) of silage production. The experimental design was randomized block in a factorial scheme with four replications including two sources of nitrogen (urea and ammonium nitrate) and five N doses (0, 50, 100, 150, and 200 kg ha-1 by cutting). The increase in N provided greater DM and crude protein content and reduced the fiber content in neutral detergent. The source of N did not affect the chemical composition, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adubos e adubação; Nutrição de plantas; Fitotecnia nitrogen fertilization; Chemical analysis; Production cost; Tropical grass; Panicum maximum. Adubos e adubação.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/36395

Technical and economic viability and nutritional quality of mombasa guinea grass silage production
Provedor de dados: 1
Autores: Galindo, Fernando Shintate; Beloni, Tatiane; Buzetti, Salatier; Teixeira Filho, Marcelo Carvalho Minhoto; Dupas, Elisângela; Ludkiewicz, Mariana Gaioto Ziolkowski.
The objective of this study was to evaluate the viability of pasture with high production capacity and the potential for production of silage using different sources and doses of nitrogen (N) by quantifying the productivity of dry matter (DM), some qualitative characteristics, the total cost of production (TC) and total operating cost (TOC) of silage production. The experimental design was randomized block in a factorial scheme with four replications including two sources of nitrogen (urea and ammonium nitrate) and five N doses (0, 50, 100, 150, and 200 kg ha-1 by cutting). The increase in N provided greater DM and crude protein content and reduced the fiber content in neutral detergent. The source of N did not affect the chemical composition, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Chemical analysis; Production cost; Tropical grass; Panicum maximum.; Adubos e adubação.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/36395

Reutilization of chemical waste in methodologies for analyses of neutral detergent fiber and acid detergent fiber - doi: 10.4025/actascianimsci.v35i3.18591
Provedor de dados: 2
Autores: Lourenço, Maria do Socorro Nahuz; Universidade Estadual do Maranhão; Berchielli, Telma Teresinha; Universidade Estadual Paulista “Júlio de Mesquita Filho"; Sader, Ana Paula de Oliveira; Universidade Estadual Paulista “Júlio de Mesquita Filho"; Malheiros, Euclides Braga; Universidade Estadual Paulista “Júlio de Mesquita Filho"; Messana, Juliana Duarte; Universidade Estadual Paulista “Júlio de Mesquita Filho"; Canesin, Roberta Carrilho; Universidade Estadual Paulista “Júlio de Mesquita Filho".
The disposal of chemical waste and the precision of analyses of the neutral (NDF) and acid (ADF) detergent fiber contents were evaluated utilizing conventional (Van Soest) and alternative methods of analyses. The recovery of acetone promoted both economic and environmental gains, with a recovery rate of 84.12%. The precision of the analyses was not observed in most of the determinations with reutilization of chemical waste in all the analytical methods tested, in spite of promoting decrease in cost, time invested in the preparation of solutions and the disposal of chemical waste.   
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.03.00-1 animal nutrition; Chemical analysis; Sustainability.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/18591

Structural and physical-chemical analyses of sulfated polysaccharides from the sea lettuce  Ulva lactuca and their effects on thrombin generation
Provedor de dados: 3
Autores: Barcellos, Priscila Gomes; Rodrigues, José Ariévilo Gurgel; Queiroz, Ismael Nilo Lino de; Araújo, Ianna Wivianne Fernandes de; Benevides, Norma Maria Barros; Mourão, Paulo Antônio de Souza.
 Ulva lactuca (Chlorophyceae) has biotechnologically-important sulfated-polysaccharides (Ul-SPs), but their potentials on thrombin generation (TG) are unknown. This study analyzed the structural and physical-chemical features of the Ul-SPs as modulators of TG. Proteolytic digestion yielded (13.13%) extract containing sulfate (20.43%) and total sugars (65.72%), besides ulvan consisting of rhamnose, xylose, glucose, glucuronic acid and α-/β-types glycosidic linkages as characterized by one-/two-dimensions nuclear magnetic resonance (NMR) experiments. Fractionation of the Ul-SPs by DEAE-cellulose chromatography yielded Ul-SP1 and Ul-SP2 (0.50 and 0.75 M NaCl, respectively) showing sulfation (15.72-18.04%) and total sugars (59.73-60.58%) consistent with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ulvales; Complex glycans; Chemical analysis; Thrombosis.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34916

Microwave drying of plant tissue for nutritional analysis of Corymbia citriodora (Hook.) and Hevea brasiliensis Muell. Arg.
Provedor de dados: 115
Autores: Teixeira,Matheus Pozetti; Campos,Cid Naudi Silva; Prado,Renato de Mello; Caione,Gustavo; Mingotte,Fábio Luiz Checchio; Agostinho,Flavia Bastos.
Abstract The method used to dry plant tissue samples may modify its nutrient content, and results in incorrect diagnostic of crop nutritional status. The hypothesis was that microwave drying method does not affect the nutrient content of leaves neither the interpretation of the results, as compared to oven-drying procedure. In this study we evaluated the effect of microwave drying of eucalyptus (Corymbia Citriodora (Hook.)) and rubber trees (Hevea brasiliensis Muell. Arg.) leaves on dry matter and macronutrient content, as compared to oven drying. The study was performed in a laboratory at the Department of Soils and Fertilizers of Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Jaboticabal-SP-Brazil. The experiments were: one using leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical analysis; Dry matter; Nutritional status; Plant material; Plant nutrition.
Ano: 2017
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952017000500555

Anticoagulant activity of a sulfated polysaccharide isolated from the green seaweed Caulerpa cupressoides
Provedor de dados: 52
Autores: Rodrigues,José Ariévilo Gurgel; Vanderlei,Edfranck de Sousa Oliveira; Bessa,Érika Façanha; Magalhães,Francisco de Araújo; Paula,Regina Célia Monteiro de; Lima,Vilma; Benevides,Norma Maria Barros.
The aim of this study was to evaluate certain molecular characteristics of a sulfated polysaccharide (SPs) with anticoagulant properties, isolated from Caulerpa cupressoides (Chlorophyta). Crude SPs were extracted by proteolytic digestion (papain), followed by ion-exchange chromatography on a DEAE-cellulose column. The fractions obtained were analyzed for molecular mass, 0.5% agarose gel electrophoresis and chemical composition. The activated partial thromboplastin time (APTT) test was applied using normal human plasma and standard heparin (HEP) (193 IU mg-1). The yield was ~ 3%, and the chromatography procedure separated the material into three different SP fractions (F I, F II and F III), eluted at the concentrations of 0.50, 0.75 and 1.00 M of NaCl,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine algae; Sulfated macromolecules; Chemical analysis; APTT test.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400007

Chemical composition of flours made of residues from the king palm (Archontophoenix alexandrae) industry
Provedor de dados: 52
Autores: Vieira,Manoela Alano; Podestá,Rossana; Tramonte,Karina Cardoso; Amboni,Renata Dias de Mello Castanho; Simas,Karina Nunes de; Avancini,Sandra Regina Paulon; Amante,Edna Regina.
Residues from King palm (Archontophoenix alexandrae) processing were used for the production of flours, which were then chemically characterized. The protein content in these flours ranged from 3.62 to 9.75 g/100g and was higher in sifted leaf flour (SLF). The dietary fiber contents varied from 64 to 72 g/100g. These values were high when compared to those of flours used in human nutrition. Analysis of anti-nutritional factors showed phytate contents to be below the levels that affected the bioavailability of minerals in human diet. Tannin contents were compatible with those found in legumes, between 0 and 2000 mg/100g. These flours showed high mineral content, which suggested a possibility for them to be used as food supplement. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archontophoenix alexandrae; Residues; Flour; Chemical analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400021

Antiproliferative Effect of Urera baccifera Leaves Against Ovarian Carcinoma Cell Line (OVCAR-3)
Provedor de dados: 52
Autores: Benvenutti,Régis Carlos; Gomes,Denise B.; Zanchet,Barbara; Locateli,Gelvani; Vechia,Cristian Alex Dalla; Zanotelli Serpa,Patrícia; Lutinski,Junir; Rodrigues Junior,Sinval Adalberto; Schönell,Amanda Patrícia; Diel,Kriptsan Abdon Poletto; Miorando,Daniela; Ernetti,Jackeline; Alves,Bianca de Oliveira; Zilli,Gabriela Adriany Lisboa; Banzato,Thais Petrochelli; Ruiz,Ana Lúcia Tasca Gois; Vidal Gutiérrez,Max; Vilegas,Wagner; Roman Junior,Walter Antônio.
Abstract Natural products, especially phytochemicals, have been extensively studies and have exhibited important antiproliferative effects. The American native species Urera baccifera (L.) Gaudich. ex Wedd. (Urticaceae) is widely distributed in Brazil, where it is known as urtiga-vermelha or urtigão. The leaves are popularly used as anti-inflammatory, antirheumatic and in the treatment of gastric disorders. However, the antiproliferative potential of this plant against human tumor cells remain to be elucidated. In this study, we evaluated the antiproliferative effects of U. baccifera leaves extracts and fractions against a panel of human tumor cell lines in vitro besides a chemical evaluation of the most active sample by mass spectrometry (ESI-IT-MSn). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumor agents; Medicinal plants; Chemical analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100412

Antimicrobial effect of a crude sulfated polysaccharide from the red seaweed Gracilaria ornata
Provedor de dados: 52
Autores: Amorim,Rodrigo das Neves dos Santos; Rodrigues,José Ariévilo Gurgel; Holanda,Márjory Lima; Quinderé,Ana Luíza Gomes; Paula,Regina Célia Monteiro de; Melo,Vânia Maria Maciel; Benevides,Norma Maria Barros.
The aim of this study was to determine the yield, chemical composition, specific rotation (SR), infrared (IR) spectroscopy and the effect on bacterial growth of a crude sulfated polysaccharide (SP) from the red marine alga G. ornata (Go). Go-1 (25°C), Go-2 (80°C), and Go-3 (80°C) were sequentially extracted and yielded 9.2%. The contents of sulfate (5.88-10.3%) and proteins (0.1-3.7%) were small. The values of SR were [µ]D20°f -19.0, -51.0, and -56.5, respectively. IR spectrums showed the presence of galactose-4 sulfate and absence of 3,6-anydrogalactose-2 sulfate, galactose-6 sulfate and galactose-2 sulfate. SR and IR techniques confirmed SPs. Go-3 was tested on the growth of bacteria (Bacillus subtilis, Staphylococcus aureus, Enterobacter aerogens,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Sulfated macromolecules; Chemical analysis; Antimicrobial.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200001

Evaluation of On-Farm Quick Tests on Slurries from Southern Chile Dairy Farms
Provedor de dados: 117
Autores: Salazar S,Francisco; Rosas U,Marianela.
Currently in Chile, there is a lack of tools to determine the real-time nutrient contribution of slurries. This study aims to evaluate three quick tests for their accuracy in estimating the total contents of N (TN), P (TP), K (TK), and ammonium-N (N-NH4+) in dairy slurries. The quick tests included the Agros Nova Meter, Quantofix N Volumeter, and a hydrometer. While the Agros and Quantofix meters directly measure the ammonium-N content; the hydrometer indirectly estimates the total content of N, P, and K based on linear relationships with the slurry DM. Samples (73) were collected from dairy farms along Southern Chile (39° to 44° S and 71 to 73° W). Analyses were carried out on laboratory conditions using conventional techniques as well as using each of...
Tipo: Journal article
Palavras-chave: Slurry; Organic residue; Chemical analysis; Nutrients.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300021

Analysis of soil organic matter in tropical soils with near-infrared spectroscopy (NIRS) and chemometrics
Provedor de dados: 118
Autores: Jarquín-Sánchez,Aarón; Salgado-García,Sergio; Palma-López,David J; Camacho-Chiu,Wilder.
The objective of this study was to predict the concentration of soil organic matter (SOM) in tropical soils using near-infrared spectroscopy (NIRS) for samples measured within a polyethylene bag and without a bag. One hundred and fifty six soil samples from the humid tropics of Tabasco, Mexico with contrasting chemical characteristics were selected. The samples were dried, ground, and sieved through 2 mm and 5 mm screens, and their SOM contents were determined using the Walkley-Black method. The soil samples were packed in polyethylene bags, and SOM was measured directly with and without a bag using a quartz probe (FOSS 5000 model of NIRsystems, DK-3400 Hillerod,Denmark) for a range from 1100 to 2000 nm to obtain a prediction model of SOM. The model for...
Tipo: Journal article
Palavras-chave: Chemical analysis; Tropical soil; Optical fiber; Model; Organic matter prediction.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200015