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Itens para a visualização no momento 11-20 of 66
Síntese de novos isoxazóis e pirazóis a partir de derivados 1,3-diíno indólicos
(Universidade Federal de Santa Maria, 2015-04-06)
In this work it describe the synthesis and characterization of new 1,3-diynes indole derivatives, the 1,6-bis(1H-indol-1-yl)hexa-2,4-diynes (6 examples) and unsymmetrical 1-(5-arylpenta-2,4-diynyl)-1H-indoles (6 examples), ...
Avaliação da calibração em LA-ICP-MS usando papel filtro para análise de plantas
(Universidade Federal de Santa Maria, 2015-01-13)
In this work, a new calibration strategy was investigated for the determination of As, Ba, Cd,
Ce, Co, Cr, Cu, La, Mn, Ni, Pb, Se, Sr, Tl, V and Zn in medicinal plants by laser ablation and
inductively coupled plasma mass ...
Desemulsificação de petróleos assistida por ultrassom e posterior caracterização das fases água e óleo
(Universidade Federal de Santa Maria, 2011-08-19)
The effect of ultrasound (US) for demulsification of crude oils with different
characteristics (viscosity, density e water content) was investigated, without using
chemical demulsifier. Initially, the treatment using US ...
Síntese regiosseletiva de 2-metiltiopirimidin-4(3h)-onas N3-substituídas, uracilas derivadas e bromacil análogos
(Universidade Federal de Santa Maria, 2014-01-31)
A series of twenty-seven 3,6-disubstituted 2-methylthiopyrimidin-4(3H)-ones that have as substituents at 6 position of the pyrimidine ring the groups Me, Ph, 4-Me-C6H4, 4-OMe-C6H4, 4-F-C6H4, 4-Br-C6H4 and at 3 position the ...
Síntese de Calcogenofenos e Isoquinolinas via Reações de Ciclização Intramolecular
(Universidade Federal de Santa Maria, 2013-11-26)
In the first part of this work, a series of selenophenes and tellurophenes were prepared starting from of (Z)-chalcogenoenynes, by employing FeCl3 diorganyl dichalcogenide-mediated intramolecular cyclization. In general, ...
Determinação de tiocompostos por voltametria e coulometria em matrizes salinas
(Universidade Federal de Santa Maria, 2006-08-11)
The Laboratory of Support to Hemodialysis Clinics (LACHEM) has been investigating for many years the behaviour of many species in saline matrices as hemodialysis salts. In this work, the determination of the five thiocompounds ...
Estudo fitoquímico da raiz da espécie Melochia chamaedrys St. Hil
(Universidade Federal de Santa Maria, 2005-11-04)
Melochia chamaedrys St.Hil. is a plant that is locally known as douradinha , it is found in South America, more exactly in the south of Brazil, Argentina, and Uruguay. In the state of Rio Grande do Sul , the species M. ...
Decomposição de amostras botânicas e leite em pó utilizando peróxido de hidrogênio em sistema de alta pressão e posterior determinação elementar por ICP OES e ICP-MS
(Universidade Federal de Santa Maria, 2016-06-28)
Recently, there is an appeal to reduce the use of toxic reagents in a great effort for the development of analytical "green" methods. Thus, the paper proposes the elemental analysis of botanical and food samples without ...
Síntese de pirrolocumarinas via nitroestirenos e de novos selenetos derivados da cumarina
(Universidade Federal de Santa Maria, 2017-03-08)
This work describes the synthesis of pyrrolo[3,2-c]coumarins from 4-aminophenylcoumarins and nitrostyrenes (17 examples), which were obtained in yelds between 6 and 76 % in a reaction catalised by PTSA.H2O and under ...
Influência do tratamento culinário na concentração e biodisponibilidade in vitro de metais, não-metais e espécies de arsênio em frutos do mar
(Universidade Federal de Santa Maria, 2015-07-01)
Over the last decades a wide variety of analytical methods and bioavailability, interactions, metabolism and toxicity studies were performed in order to evaluate the risks associated with contamination of heavy metals in ...