Chemical Substance
Mostrando 13-24 de 200 artigos, teses e dissertações.
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13. Development and validation of a stability indicating method for quantification of the sesquiterpene lactone eremantholide C from Lychnophora trichocarpha (Brazilian arnica)
ABSTRACT Pharmacological activities as anti-inflammatory, anti-hyperuricemic, anti-gouty arthritis, antitumor and trypanocidal activities of the aerial parts from Lychnophora trichocarpha (Spreng.) Spreng. ex Sch.Bip., Asteraceae (Brazilian arnica) have already been proved. Eremantholide C is a sesquiterpene lactone and one of the active chemical constituent
Rev. bras. farmacogn.. Publicado em: 2017-08
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14. Streptomyces lunalinharesii 235 prevents the formation of a sulfate-reducing bacterial biofilm
ABSTRACT Streptomyces lunalinharesii strain 235 produces an antimicrobial substance that is active against sulfate reducing bacteria, the major bacterial group responsible for biofilm formation and biocorrosion in petroleum reservoirs. The use of this antimicrobial substance for sulfate reducing bacteria control is therefore a promising alternative to chemic
Braz. J. Microbiol.. Publicado em: 2016-09
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15. Identification of a fat-soluble fraction of Sparganium stoloniferum that inhibits cervical cancer HeLa cells
ABSTRACT Context The rizoma of Sparganium stoloniferum has been used as a traditional Chinese medicinal herb for thousands of years. Sparganium stoloniferum is a stasis-breaking drug to treat a wide range of diseases including cancer,however, its activity of extract on cervical cancer HeLa cells and the mechanisms remains unknown. Objective This study aime
Braz. arch. biol. technol.. Publicado em: 07/07/2016
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16. Antigenotoxicity and antimutagenicity of ethanolic extracts of Brazilian green propolis and its main botanical source determined by the Allium cepa test system
Abstract Brazilian green propolis is a resinous substance prepared by bees from parts of the plant Baccharis dracunculifolia. As it possess several biological properties, this work assessed the cytotoxic/anticytotoxic, genotoxic/antigenotoxic and mutagenic/antimutagenic potential of ethanolic extracts of Brazilian green propolis (EEGP) and of B. dracunculifo
Genet. Mol. Biol.. Publicado em: 24/05/2016
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17. CRAQUEAMENTO TÉRMICO DA GLICERINA: UMA PROPOSTA DE EXPERIMENTO PARA QUÍMICA ORGÂNICA
In this work, an undergraduate organic chemistry experiment based on thermal cracking of glycerin is proposed. The reagent is obtained as a by-product from the practice of biodiesel synthesis, and allows reduction of waste produced in the lab. The main product obtained from thermal cracking was characterized by GC analysis as acrolein. This substance was
Quím. Nova. Publicado em: 2015-06
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18. Estudo da variação do perfil químico de laranja pêra e tangor Murcott após a inoculação do fungo Alternaria alternata
This paper describes the study of variation in the chemical profile of citrus after inoculation of the fungus Alternaria alternata, who causes the disease known as alternaria brown spot (ABS), which is one of the most serious diseases in orchards of tangerines, causing major damage to the Brazilian citrus. For this, A. alternate was inoculated in sweet orang
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2013
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19. Growth study and essential oil analysis of Piper aduncum from two sites of Cerrado biome of Minas Gerais State, Brazil
Piper aduncum L., Piperaceae, stands out due to its biological activities, however, it is still found in the wild and little is known about its agronomic point of view. The aim of this study was to evaluate the growth and to analyze the chemical composition of essential oils from leaves of P. aduncum collected in two different sites of Cerrado as well as in
Rev. bras. farmacogn.. Publicado em: 2013-10
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20. In vitro antimicrobial activity of auxiliary chemical substances and natural extracts on Candida albicans and Enterococcus faecalis in root canals
Objective: The aim of this study was to evaluate the antimicrobial activity of auxiliary chemical substances and natural extracts on Candida albicans and Enterococcus faecalis inoculated in root canals. Material and Methods: Seventy-two human tooth roots were contaminated with C. albicans and E. faecalis for 21 days. The groups were divided according to t
J. Appl. Oral Sci.. Publicado em: 2013-04
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21. Chemical and botanical characterization of Chilean propolis and biological activity on cariogenic bacteria Streptococcus mutans and Streptococcus sobrinus
Propolis is a non-toxic natural substance with multiple pharmacological properties including anticancer, antioxidant, fungicidal, antibacterial, antiviral, and anti-inflammatory among others. The aim of this study was to determine the chemical and botanical characterization of Chilean propolis samples and to evaluate their biological activity against the car
Braz. J. Microbiol.. Publicado em: 2013
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22. UtilizaÃÃo de extrato hidrossolÃvel de soja na elaboraÃÃo de bebida fermentada simbiÃtica / Use of hydrosoluble soybean extract in the preparation of symbiotic fermented beverage
In Brazil, the grain harvest in 2007/08 was about 145 million tons, a record for the domestic agriculture. In 2008 soybeans led to participation in the value of production of temporary and permanent crops with 39.18% which were superseded by the 2009/2010, in which the Paranà state reached the first place in soybean production in Brazil. As possible benefit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2012
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23. Valores de referência para metais potencialmente tóxicos em sedimentos e em moluscos filtradores no Rio Ribeira de Iguape / Reference values to potentially toxic metals in sediments and mussels in the River Ribeira de Iguape
The Ribeira do Iguape River Basin (RIRB) was historically influenced by intense mining activities mainly related to lead (Pb) extraction. For many decades, such exploitation was conducted under rudimentary conditions without control of environmental impacts produced during the stages of ore extraction and beneficiation. Thus, mining wastes and metallurgical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2012
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24. Análise forense: pesquisa de drogas vegetais interferentes de testes colorimétricos para identificação dos canabinoides da maconha (Cannabis Sativa L.)
Marijuana (Cannabis sativa L.) is the most cultivated, trafficked and consumed illicit drug worldwide. Estimates indicate 10% of individuals experiencing marijuana become daily users, and 20-30% use it weekly. Around 489 natural compounds have been identified in this plant, of which 70 are cannabinoids, responsible for psychic effects. The most relevant cann
Quím. Nova. Publicado em: 2012