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| Registros recuperados: 79 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| OLIVEIRA JUNIOR, A. de; CASTRO, C. de; SILVA, M. G. da; LEITE, R. dos S.; KLEINERT, J. J.; NARDO, A. E.; FARINE, E. L.; MOREIRA, D. A.; CAMARGO, I. S. P. de. |
| A determinação da concentração de nitrogênio (N) pelo método Kjeldhal é considerada padrão para determinação de N total. Entretanto, este método gera alta quantidade de resíduos, é moroso e passível de erros durante a destilação e a titulação. Por outro lado, a determinação indireta do teor de proteína nos grãos de soja, por meio da espectroscopia no infravermelho próximo (NIR) de vem sendo realizada com sucesso na Embrapa Soja. Por se tratar de um método que não gera resíduos, rápido e que pode ser realizado em amostras de grãos “in natura” e estar bem calibrado para a determinação do teor de proteínas em grãos de soja, o objetivo do presente trabalho foi avaliar a viabilidade de utilização do NIR em substituição ao método Kjeldahl para determinação da... |
| Tipo: Parte de livro |
Palavras-chave: NIR; Soja; Análise química; Grão; Nitrogenio; Soybeans; Chemical analysis; Grains; Nitrogen. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/907654 |
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| 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 |
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| BEHLING NETO, A.; PEREIRA, D. H.; PEDREIRA, B. C. e; SILVA, L. A. L.; AMARO, M. R.; POPE, A. M.; CARVALHO, A. P. S.; DOMICIANO, L. F.. |
| The first step for chemical evaluation is the feed drying in forced air oven. Then, to determine the feed dry matter (DM) content, after grinding the sample in a mill, a second drying is done at 105°C to evaporate remaining water. However, for silage samples, part of the fermentation products can be lost by volatilization, so, the correction of DM content is required to obtain proper water content. According to Weissbach and Strubelt (2008 a,b), it is possible to correct this variable in maize and grass samples, using an equation that includes the fermentation products concentrations, if the forage processing consists of preliminary drying at 60 to 65 °C, with a second drying for three hours at 105 °C. However, in Brazil, the most common DM content... |
| Tipo: Parte de livro |
Palavras-chave: Maize; Mato Grosso; Sinop-MT; Chemical analysis; Grass silage. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1119597 |
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| 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 |
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| 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 |
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| Registros recuperados: 79 | |
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