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Itens para a visualização no momento 41-50 of 1937
Síntese, Caracterização Estrutural e Propriedades Luminescentes de Complexos de Lantanídeos (III) com Hidrazonas e Semicarbazonas derivadas da 2,6-Diformilpiridina e com Triazenos 1-óxidos.
(Universidade Federal de Santa Maria, 2011-03-30)
Lanthanide complexes with ligands containing oxygen and nitrogen as donor atoms have been investigated in this study aiming to explore the coordinative behavior of metals with high coordination numbers, as well as a study ...
Anti-inflamatório dexametasona: estudos de biodegradabilidade, toxicidade, ocorrência e degradação oxidativa avançada em efluente hospitalar
(Universidade Federal de Santa Maria, 2010-12-15)
The presence of drugs and active substances in the environment has been a concern in recent years. A range of these compounds have been found in water treated in sewage
treatment effluents, surface waters and less frequently ...
Método rápido para a determinação simultânea de resíduos de agrotóxicos e medicamentos veterinários em alimentos de origem animal por LC-MS/MS
(Universidade Federal de Santa Maria, 2011-03-03)
Currently, one of highest trade barriers that Brazil has found for the marketing of their products from the agribusiness chain is the lack of informations on the presence of residues in foods produced in the country. Due ...
Análise estrutural de complexos derivados de telúrio
(Universidade Federal de Santa Maria, 2011-03-18)
This work describes the synthesis and structural analysis of different kinds of
tellurium based compounds, depicting the preparation of zwitterions, coordination
polymers and also heteronuclear complexes, using ...
Determinação de halogênios em carvão, coque petroquímico e alimentos após combustão iniciada por microondas
(Universidade Federal de Santa Maria, 2008-03-14)
The microwave-induced combustion (MIC) method was applied for coal and petroleum coke digestion for further determination of bromine, chlorine, fluorine and iodine
by ion chromatography (IC). Samples (up to 500 mg) were ...
Aplicação de enonas cíclicas como precursores para síntese de trifluoracetiltetraidropiridinas e 1H-pirazóis-3(5)-carboxilato de etila
(Universidade Federal de Santa Maria, 2010-07-15)
The present work describes the synthesis of novel 1-alkyl(aryl)-2-alkoxy-5-trifluoroacetyl-1,2,3,4-tetrahydropyridines, aza-condensed tetrahydropyridines and ethyl-1H-pyrazoles-3(5)-carboxylate from the use of cyclic enones ...
Síntese de 1h-pirazóis usando irradiação de ultra-som e de 2-pirrolonas derivadas do ácido levulínico
(Universidade Federal de Santa Maria, 2008-11-25)
This work describes the synthesis of 4,5-dihydropirazoles through a sonochemical methodology, from the reaction of cyclocondensation of 1,3-diaryl-2-propen-1-ones with aminoguanidine hydrochloride and thiosemicarbazide. ...
Estudo dos metabólitos secundários de Scutia buxifolia e suas atividades biológicas
(Universidade Federal de Santa Maria, 2010-04-16)
In this work, four new neutral cycle peptide , scutianenes W (210), X (211), Y (212) and Z (213), have been isolated from Scutia buxifolia Reiss (Rhamnaceae) , along with seven know compounds, four cylopeptide alkaloids, ...
Aplicação da amostragem direta-GF AAS para a determinação de elementos traço em metérias-primas para a produção de poliuretanos
(Universidade Federal de Santa Maria, 2010-02-04)
Polymeric diphenylmethane diisocyanate (PMDI) and diphenylthane dianiline (MDA) are importante raw materials in the manufacture of polyurethanes. These products have wide application in various fields such as medicine, ...
Aplicação de métodos voltamétricos de análise na especiação de cromo, selênio e antimônio em matrizes salinas
(Universidade Federal de Santa Maria, 2010-02-04)
This work aimed to explore the speciation analysis of chromium, selenium and antimony, elements of clinical and geochemical relevance, in the saline samples seawater, hydrothermal fluid and hemodialysis fluid. These samples, ...