Chemical Substance
Mostrando 25-36 de 200 artigos, teses e dissertações.
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25. Triterpenes from Minquartia guianensis (Olacaceae) and in vitro antimalarial activity
Minquartia guianensis, popularly known as acariquara, was phytochemically investigated. The following triterpenes were isolated from the dichloromethane extract of leaves: lupen-3-one (1), taraxer-3-one (2) and oleanolic acid (3). The dichloromethane extract of branches yielded the triterpene 3β-methoxy-lup-20(29)-ene (4). The chemical structures were chara
Quím. Nova. Publicado em: 2012
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26. Sensibilidade da microalga marinha Dunaliella tertiolecta BUTCHER a diferentes substâncias químicas utilizadas como referência em ensaios ecotoxicológicos / Sensitivity of the marine microalgae Dunaliella tertiolecta BUTCHER to the different chemical substances utilized as toxicity test reference
Os ensaios ecotoxicológicos com o fitoplâncton marinho têm sido uma importante ferramenta para o monitoramento da qualidade de águas devido à sua relevância ecológica. A variabilidade dos resultados dos ensaios ecotoxicológicos também pode ser atribuída à sensibilidade do lote de organismos-teste. O presente trabalho traz informações da sensibil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2011
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27. Avaliação ecotoxicológica e caracterização química em águas superficiais do rio Cubatão, SP / Ecotoxicological assessment and chemical characterization in surface waters of Cubatão River, SP
Ambientes dulcícolas ocupam uma pequena parcela da superfície do planeta comparada aos ambientes marinhos e terrestres, porém são de suma importância para diversas atividades humanas e essenciais à manutenção da vida. Por estarem localizadas próximas a áreas urbanizadas passam a servir como corpos receptores de efluentes domésticos e até industri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/09/2011
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28. Análise da atividade antimicrobiana dos óleos de dopaíba (C opaifera officinalis ) e da melaleuca ( Melaleuca alternifolia ) sobre Fusobacterium nucleatum e Por phyromonas gingivalis: determinação das concentrações inibitórias e bactericidas mínimas e efeito de concentrações subinibitórias sobre a agregação / Antimicrobial activity of copaiba (Copaifera officinalis) and melaleuca (Melaleuca alternifolia) oils on Porphyromonas gingivalis and Fusobacterium nucleatum: determination of minimum inhibitory and bactericidal concentrations and subinibitory effect on the aggregation
The oral cavity is a complex microbial habitat that has more than 500 bacterial species as components of the microbiota. Periodontal health is established when there is equilibrium between pathogens and host. The chlorhexidine digluconate is one of the most commonly used oral antibiotics, however, this substance has been associated with some undesirable side
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2011
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29. CARACTERIZAÇÃO QUÍMICA E DIGESTIBILIDADE IN VITRO DE LEGUMINOSAS FORRAGEIRAS TROPICAIS COM FOCO NO EFEITO DE COMPOSTOS FENÓLICOS E IDADE DA PLANTA. / CHEMICAL AND IN VITRO DIGESTIBILITY OF TROPICAL FORAGE LEGUMES FOCUSING ON THE EFFECT OF PHENOLIC COMPOUNDS AND PLANT AGE.
It were evaluated the gas production from tropical legumes with forage potential, including sun hemp (Crotalaria juncea), indian rattlebox (Crotalaria spectabilis), pigeon pea (Cajanus cajan), perennial horse gram (Macrotyloma axillare), cowage (Mucuna aterrina) wild groundnut (Calopogonium mucunoides) stylosanthes Campo Grande (Stylosantis sp .) and jack-be
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011
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30. Preparation and application of chitosan nanoparticles and nanofibers
Encapsulation and immobilization technology is important for the food processing and bioengineering industries. Chitosan is a natural polysaccharide prepared by the N - deacetylation of chitin. It has been widely used in food and bioengineering industries, including the encapsulation of active food ingredients, in enzyme immobilization, and as a carrier for
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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31. Inhibition of Saccharomyces cerevisiae Pdr5p by a natural compound extracted from Brazilian Red Propolis
Multidrug resistance of cancer cells and pathogenic microorganisms leading to the treatment failure of some forms of cancer or life-threatening bacterial or fungal infections is often caused by the overexpression of multidrug efflux pumps belonging to the ATP-binding cassette transporters superfamily. The multidrug resistance of fungal cells often involves t
Revista Brasileira de Farmacognosia. Publicado em: 12/08/2011
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32. Modulation of nociceptive-like behavior in zebrafish (Danio rerio) by environmental stressors
Zebrafish have been demonstrated to react consistently to noxious chemical stimuli and present reliable phenotypes of stress, fear, and anxiety. In this article, we describe the modulation of nociceptive-like responses of zebrafish to fear-, stress-, and anxiety-eliciting situations. Animals were exposed to an alarm substance, confinement stress, or a novel
Psychology & Neuroscience. Publicado em: 2011-06
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33. In vitro evaluation of the action of irrigating solutions associated with intracanal medications on Escherichia coli and its endotoxin in root canals
OBJECTIVE: The purpose of this study was to evaluate the effcacy of auxiliary chemical substances and intracanal medications on Escherichia coli and its endotoxin in root canals. MATERIAL AND METHODS: Teeth were contaminated with a suspension of E. coli for 14 days and divided into 3 groups according to the auxiliary chemical substance used: G1) 2.5% sodium
Journal of Applied Oral Science. Publicado em: 2011-04
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34. Chemical stability of enalapril maleate drug substance and tablets by a stability-indicating liquid chromatographic method
The chemical stability of enalapril drug substance and tablets was studied by a stability-indicating liquid chromatographic method. Stress testing was performed on drug substance under various conditions. Accelerated stability testing was carried out for different formulations of enalapril tablets. Chromatographic separation was achieved on a RP-18 column, u
Química Nova. Publicado em: 2011
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35. Dificuldades conceituais no aprendizado de equilíbrios químicos envolvendo reações ácido-base
Common student misunderstandings regarding chemical equilibrium are reported taking into account the response of freshman students to some typical questions involving acid-base reactions. Language has been shown to be one of the main issues associated with students' difficulties on this subject, such as in the case of concentration and amount of substance (m
Química Nova. Publicado em: 2011
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36. Sensory response of the egg parasitoid Telenomus podisi to stimuli from the bug Euschistus heros.
The objective of this work was to study the foraging behavior of Telenomus podisi Ashmead (Hymenoptera: Scelionidae) in the presence of stimuli from its host, Euschistus heros (Heteroptera: Pentatomidae). The stimuli selected were: egg mass; virgin males and females; volatile extracts of sexually mature males and females; components of male sex pheromone; a
Pesquisa Agropecuária Brasileira. Publicado em: 2011