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Itens para a visualização no momento 201-210 of 4128
Estudo do comportamento químico de heterociclos trifluormetil substituídos em reações com DAST
(Universidade Federal de Santa Maria, 2011-03-01)
This work describes the study of the chemical behavior of trifluoromethyl substituted heterocycles as 1H-pyrazoles, 2-pyrazolines, 2H-cromenones and isoxazolines in reactions with DAST, with the aim of evaluating possible ...
Validação e aplicação de método empregando QuEChERS modificado e GC-ECD para determinação de resíduos de pesticidas em grão e casca de arroz
(Universidade Federal de Santa Maria, 2010-08-12)
The current agriculture is characterized by the use of new technologies and equipment, the increased number of agronomic research and the use of a variety of inputs such as pesticides and fertilizers. All this is directly ...
Síntese e análise estrutural de novos tetrahaloorganoteluratos(IV) monoaniônicos e hexahaloteluratos(IV) dianiônicos
(Universidade Federal de Santa Maria, 2004-09-21)
This work presents our contribution about the solid state of new anionic tetrahaloorganyltellurates(IV) and dianionic hexahalotellurates(IV) compounds. We
present the synthesis and structural characterization of seven new ...
Determinação simultânea de sulfametoxazol e trimetoprima em formulações farmacêuticas por ATR-FTIR e DRIFTS empregando calibração multivariada
(Universidade Federal de Santa Maria, 2008-03-10)
A partial least-squares calibration (PLS) procedure in combination with infrared spectroscopy has been developed for simultaneous determination of sulphamethoxazole (SMZ) and trimethoprim (TMP) in raw material powder ...
Cefalosporinas e surfactante não-iônico em efluente hospitalar: determinação, degradação por meio de fotólise e eletrocoagulação e identificação de subprodutos e metabólitos
(Universidade Federal de Santa Maria, 2009-04-06)
The currently incorrect and excessive consumption of pharmaceuticals and surfactants, mainly domestic usage, has become a concern to the scientific community around the world, due to the environmental consequences with ...
Síntese de ciclodextrinas pentafluorpropioniladas e suas aplicações como fases estacionárias quirais em cromatografia gasosa enantiosseletiva
(Universidade Federal de Santa Maria, 2008-12-05)
Three new α, β- and γ-cyclodextrins derivatives were synthesized: hexakis-(2,6-di-O-pentyl)-α-cyclodextrin, heptakis-(2,6-di-O-pentyl)-β-cyclodextrin and octakis-(2,6-di-O-pentyl)-γ-cyclodextrin. The structures were ...
Estudo fitoquímico de três espécies pertencentes à família Rhamnaceae: Discaria americana, Colletia paradoxa e Gouania ulmifolia
(Universidade Federal de Santa Maria, 2005-08-26)
The present work describes the phytochemistry study and antimicrobial activity of the aerial parts and bark root of three species from Rhamnaceae family: Discaria americana Gilles & Hook, Colletia paradoxa Sprengel and ...
Componentes dos sistemas purinérgico e colinérgico nos processos inflamatórios e neurológicos em roedores infectados experimentalmente com Toxoplasma gondii
(Universidade Federal de Santa Maria, 2014-06-06)
Toxoplasmosis is a zoonotic disease caused by Toxoplasma gondii, often leading to functional, biochemical and structural changes, especially in the central nervous system. These changes are usually accompanied by a marked ...
Determinação de arsênio e cromo em insumos farmacêuticos contendo enxofre por espectrometria de absorção atômica com forno de grafite e análise direta de amostras sólidas
(Universidade Federal de Santa Maria, 2007-09-17)
In this work a procedure was developed using direct solid sampling (DSS) and graphite furnace atomic absorption spectrometry (GF AAS). The study was applied to the determination of As in hydrochlorothiazide and barium ...
Alternativas de manejo de pastagem natural submetida a pastoreio rotativo
(Universidade Federal de Santa Maria, 2012-02-15)
This study aimed to evaluate different alternatives for management of natural pasture.
Vegetation dynamics was evaluated for a period of six years in a natural pasture, submitted
along 16 years to fire and grazing treatments. ...