Classification Chemometric Methods
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Estudos das relações estrutura-toxicidade de agrotóxicos
Computational methods such as electrostatic and structural similarity of compounds were used to determine a similarity pattern for pesticides present in the database of the Medicinal Chemistry Group IQSC/USP. A collection consisting of herbicides and insecticides allowed and banned, according to the World Health Organization was used in this study. Several c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2012
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2. Acoplamento de técnicas espectrométricas com métodos quimiométricos de classificação e calibração multivariada em alimentos / Coupling spectrometric techniques with chemometric methods for classification and multivariate calibration in food
This research work describes three studies of chemometric methods employed for the classification and characterization of edible oils and its quality parameters through Fourier Transform mid infrared spectroscopy and near infrared spectroscopy, and for the monitoring the oxidative stability and quality of yogurt using fluorescence spectroscopy . The first an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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3. Aplicações de métodos quimiométricos para classifica-ção de cigarros / Applications of chemometric methods for grading of cigarettes
Os constituintes inorgânicos potencialmente tóxicos presente no cigarro são oriundos da própria planta do tabaco, que os absorve através do solo como conseqüência da utilização dos fertilizantes e fatores ambientais. Para muitas das funções vitais do metabolismo humano os constituintes inorgânicos são necessários, de modo que o excesso ou defic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/08/2009
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4. Aplicações de métodos quimiométricos para classifica-ção de cigarros / Applications of chemometric methods for grading of cigarettes
Os constituintes inorgânicos potencialmente tóxicos presente no cigarro são oriundos da própria planta do tabaco, que os absorve através do solo como conseqüência da utilização dos fertilizantes e fatores ambientais. Para muitas das funções vitais do metabolismo humano os constituintes inorgânicos são necessários, de modo que o excesso ou defic
Publicado em: 2009
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5. Avaliação do emprego de técnicas de RMN e IV aliadas a métodos quimiométricos na investigação de autenticidade da droga vegetal comercial quebra-pedra / Evaluation of employment of nmr techniques and ir combined with chemometric methods in the inquiry of authenticity of the "quebra-pedra" commercial herbal drug
The importance of medicinal plants and their use in industrial purposes is increasing. Among the herbal drugs being commercialized there are "quebra-pedras". According to the the Brazilian Pharmacopoeia, the recognized officially species as medicinal plants having the attributed pharmacological properties to "quebra-pedras" are: Phyllanthus niruri and Phylla
Publicado em: 2009
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6. Aplication of the NMR and IR spectroscopic techniques and chemometrics methods in lichens chemotaxonomy. / Aplicação das técnicas espectroscópicas de RMN e IV e de métodos quimiométricos na quimiotaxonomia de liquens. / Aplicação das técnicas espectroscópicas de RMN e IV e de métodos quimiométricos na quimiotaxonomia de liquens. / Aplication of the NMR and IR spectroscopic techniques and chemometrics methods in lichens chemotaxonomy. / Aplicação das técnicas espectroscópicas de RMN e IV e de métodos quimiométricos na quimiotaxonomia de liquens. / Aplication of the NMR and IR spectroscopic techniques and chemometrics methods in lichens chemotaxonomy.
This present work describes the chemotaxonomic analysis of lichens through the utilization of NMR spectroscopic techniques, HR-MAS and NMR in solution, and IR allied with chemometrics methods. This analysis were carried out with eleven species set of lichens divided in two families and six genera. The HR-MAS NMR spectra together the chemometric, obtained fro
Publicado em: 2007
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7. "Planejamento de quinonas com atividade tripanossomicida" / Planning of quinone compounds with trypanocidal activity
A set of 25 quinone compounds with anti-trypanocidal activity was studied by using the Density Functional Theory (DFT) method in order to calculate electronic atomic and molecular properties to be correlated with the biological activity. The chemometric methods Principal Component Analysis (PCA), Hierarchical Cluster Analysis (HCA), Stepwise Discriminant Ana
Publicado em: 2007
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8. 25 anos de quimiometria no Brasil
Chemometric activities in Brazil are described according to three phases: before the existence of microcomputers in the 1970s, through the initial stages of microcomputer use in the 1980s and during the years of extensive microcomputer applications of the ´90s and into this century. Pioneering activities in both the university and industry are emphasized. A
Química Nova. Publicado em: 2006-12
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9. Analises de mel e propolis utilizando metodos quimiometricos de classificação e calibração / Propolis and honey analysis using calibration and crustering chemometric methods
This research work describes four studies of chemometrical methods employed for the characterisation of honey and propolis. In the first study honey quality parameters, that is, acidity, humidity, and reducing sugars, were measured with the aid of mid-infrared spectroscopy by attenuated total reflectance and partial least squares multivariate calibration. Th
Publicado em: 2006