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Itens para a visualização no momento 31-40 of 162
Determinação de fungicidas em sucos de laranja empregando método de extração mini-luke modificado e UPLC-MS/MS
(Universidade Federal de Santa Maria, 2014-03-26)
Orange juice is a relevant contribution to the Brazilian economy, as long as five glasses of orange juice consumed in the world, three are produced in Brazil. For the purpose of increase the production of fruits and, ...
Alcaloides ciclopeptídicos de Scutia buxifolia e suas atividades antimicrobianas
(Universidade Federal de Santa Maria, 2014-04-29)
The phytochemical investigation of the stem bark of the specie Scutia buxifolia (Rhamnaceae) led to the isolation of four cyclopeptide alkaloids: scutianine C (14) and three diastereoisomer of scutianine H (19), isolated ...
Avaliação de métodos de decomposição de chocolate e determinação de metais por ICP-OES e ICP-MS
(Universidade Federal de Santa Maria, 2014-02-13)
In this work, was evaluated the main methods of sample preparation reported in the literature for decomposition of chocolate and, in addition, was proposed the decomposition by microwave induced combustion (MIC) for further ...
Determinação de glifosato e ampa em água por injeção direta da amostra em cromatografia iônica capilar e LC-MS/MS
(Universidade Federal de Santa Maria, 2014-08-29)
Glyphosate [N-(phosphonomethyl) glycine] is the most widely used pesticide in the world for controlling weeds in agriculture. High amounts of this herbicide and its major metabolite, aminomethylphosphonic acid (AMPA), have ...
Estudo de impureza de európio em PbSe e PbTe. Uma investigação de primeiros princípios
(Universidade Federal de Santa Maria, 2014-01-30)
In this work properties were studied the structural, electronic and magnetic semiconductors
PbSe and PbTe doped with europium (Eu) in the crystalline phase. The
investigation is performed within the density functional ...
Caracterização de filmes finos magnéticos em altas frequências
(Universidade Federal de Santa Maria, 2014-08-29)
In order to determine the complex permeability of ferromagnetic samples in the GHz
range, measurement techniques with transmission lines are most appropriate. These techniques
use the modification of the scattering ...
Conjunto de testes de garantia de qualidade de um software para planejamento radioterápico
(Universidade Federal de Santa Maria, 2014-05-29)
Radiotherapy can be highlighted as one possible treatment of cancer. From this point of view, the planning system for radiotherapic treatment is crucial. In order to check the software for the computerized planning of the ...
Estudo computacional da condutividade térmica de nanofios de Si
(Universidade Federal de Santa Maria, 2014-05-15)
In this work the thermal conductivity κ of Si nanowires using molecular dynamics simulations is calculated using the Müller-Plathe method. We show that at 500 K, κ for crystaline Si is 121; 557 W/mK, while for nanowires, ...
Síntese verde e versátil de calcogenol ésteres e avaliação da atividade antibacteriana
(Universidade Federal de Santa Maria, 2014-08-30)
The present work aims the synthesis of chalcogenoesters, by a green and
versatile methodology, using low cost and non-toxic reagents, as well as the
biological activity of this kind of compounds, as antibacterial agents.
By ...
1,3,4-oxadiazóis: estratégias para síntese e derivatização a partir do ácido 4-oxopentanóico
(Universidade Federal de Santa Maria, 2014-12-19)
This study shows strategies to prepare 1,3,4-oxadiazoles and derivatives from 4-oxopentanoic acid is reported. The compounds 4-(2-(5-substituted-1,3,4-oxadiazol-2-yl)ethyl)-2-(methylthio/phenyl)-6-(trifluoromethyl)pyrimidine; ...