Encontrados 8 documentos, a visualizar página 1 de 1
Genome diversity in the genera Fructobacillus, Leuconostoc and Weissella determ...
Chelo, Ivo M.; Zé-Zé, Líbia; Tenreiro, RogérioPulsed-field gel electrophoresis analysis of chromosomal single and double restriction profiles of 17 strains belonging to three genera of ‘Leuconostocaceae’ was done, resulting in physical and genetic maps for three Fructobacillus, six Leuconostoc and four Weissella strains. AscI, I-CeuI, NotI and SfiI restriction enzymes were used together with Southern hybridization of selected probes to provide an assessmen...
Sensores ópticos com detecção no infravermelho próximo e médio
Lima,Kássio M. G.; Raimundo Jr.,Ivo M.; Silva,Andréa Monteiro S.; Pimentel,Maria FernandaOptical chemical sensors with detection in the near and mid infrared region are reviewed. Fundamental concepts of infrared spectroscopy and optical chemical sensors are briefly described, before presenting some aspects on optical chemical sensors, such as synthesis of NIR and IR reagents, preparation of new materials as well as application in determinations of species of biological, industrial and environmental...
Construção de uma cela de fluxo de longo caminho óptico para medidas espectrofo...
Melchert,Wanessa Roberto; Rocha,Fábio R. P.; Raimundo Jr.,Ivo M.; Reis,Boaventura F.A simple and low-cost flow cell with 30 cm optical path for spectrophotometric measurements is described. It presents desirable characteristics such as low attenuation of the radiation beam and internal volume (75 µL) comparable to that of a 1-cm conventional cell (80 µL). Despite the increase in optical path, the effect on sample dispersion was also similar to that attained in the commercial cell. The performa...
Uso de membranas de Nafion para a construção de sensores ópticos para medidas d...
Pinheiro,Silvia Cristina Lopes; Raimundo Jr,Ivo M.The behaviour of Nafion® polymeric membranes containing acid-base dyes, bromothymol blue (BB) and methyl violet (MV), were studied aiming at constructing an optical sensor for pH measurement. BB revealed to be inadequate for developing sensing phases due to the electrostatic repulsion between negative groups of their molecules and the negative charge of the sulfonate group of the Nafion®, which causes leaching ...
Gran method for end point anticipation in monosegmented flow titration
Aquino,Emerson V; Pasquini,Celio; Rohwedder,Jarbas J. R; Raimundo Jr,Ivo M; Montenegro,M. Conceição B. S. M; Araújo,Alberto NAn automatic potentiometric monosegmented flow titration procedure based on Gran linearisation approach has been developed. The controlling program can estimate the end point of the titration after the addition of three or four aliquots of titrant. Alternatively, the end point can be determined by the second derivative procedure. In this case, additional volumes of titrant are added until the vicinity of the en...
Monosegemented flow potentiometric titration for the determination of chloride ...
Vieira,Jonas A.; Raimundo Jr.,Ivo M.; Reis,Boaventura F.; Montenegro,M. Conceição B.S.M.; Araújo,Alberto N.An automated flow potentiometric titration procedure for the determination of chloride in milk and wine exploiting the monosegmented flow approach is described. The flow network was designed based on a six-way solenoid valve, controlled by a microcomputer running software written in VisualBasic 3.0, allowing selection of the titration conditions. An Ag2S tubular electrode selective for Cl- and a conventional Ag...
Espectrofotometria multicanal e arranjos de fotodiodos
Raimundo Jr.,Ivo M.; Pasquini,CelioThis paper describes some aspects of multichannel spectrophotometry, principles of photodiode arrays and their applications in Analytical Chemistry.
Prognostic systems in intensive care: general principles, development, and clin...
Carneiro, A V; Cadeira de Medicina III-A e Serviço de Medicina IV, Hospital de Santa Maria, Lisboa.; Ivo, M; Girão, J; De Pádua, F; Lopes, M GIn this review article, we present the need for prognostic scoring in clinical medicine, specially in Intensive Care Medicine (ICM). The general principles of prognostication in ICM are discussed, and three general scoring systems are presented: ACUTE PHYSIOLOGY AND CHRONIC HEALTH EVALUATION (APACHE) in its 3 versions, SIMPLIFIED ACUTE PHYSIOLOGY SCORE (SAPS) and MORTALITY PREDICTION MODEL (MPM). The use of the...
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