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Partial characterization of biosurfactant from Lactobacillus pentosus and compa...
Moldes, Ana; Paradelo, R.; Vecino, X.; Cruz, J. M.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Dominguez, José Manuel; Barral, M. T.The capability of a cell bound biosurfactant produced by Lactobacillus pentosus, to accelerate the bioremediation of a hydrocarbon-contaminated soil, was compared with a synthetic anionic surfactant (sodium dodecyl sulphate SDS-). The biosurfactant produced by the bacteria was analyzed by Fourier transform infrared spectroscopy (FTIR) that clearly indicates the presence of OH and NH groups, C=O stretching of ca...
Use of high pressure to increase the content of xanthohumol in beer wort
Santos, M. da C.; Domingues, F. M.; Cruz, J. M.; Saraiva, J. A.Resumo indisponível.
Photoquenching indications of a thermally triggered transition between two diff...
Fávero,P. P.; Cruz,J. M. R.In this work we report the observation of two different EL2 metastable states in GaAs and the effect of the optical/thermal history of the sample on the behavior of the photoquenching kinetics. In one thermal/optical preparation, the photoquenching curve presented two time constants that have already been interpreted as an indication of two different metastable states. With another preparation, the initial rise...
On the use of a linear interpolation method in the measurement procedure of a s...
Silva, M. C. Gameiro; Pereira, C. A. C.; Cruz, J. M. S.Calibration and measurement procedures implemented to work with a seven-hole directional pressure probe in the mapping of pressure and velocity wind tunnel flows are reported in this paper. The performances of two different methods used to derive the flow characteristics (direction and magnitude of flow velocity vector and total and dynamic pressure) from the seven pressure values measured by the probe, are com...
Evaluation of overload effects on fatigue crack growth and closure
Borrego, L. P.; Ferreira, J. M.; Pinho da Cruz, J. M.; Costa, J. M.Fatigue crack propagation tests with single tensile peak overloads have been performed in 6082-T6 aluminium alloy at several baseline [Delta]K levels and stress ratios of 0.05 and 0.25. The tests were carried out at constant [Delta]K conditions. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post-overload behaviour is discussed in terms of ove...
Ambipolar carrier diffusion in In0.53Ga0.47As single quantum wells
Monte,A.F.G.; Silva,S.W. da; Cruz,J.M.R.; Morais,P.C.; Cox,H.M.The microluminescence surface scan technique (MSST) has been used to investigate photocarrier diffusion in undoped In0.53Ga0.47 As - InP single quantum well (QW), in the temperature (T) range from 15 K to 295 K. Narrowing of the photoluminescence (PL) spatial profile is observed as the temperature is lowered, indicating reduction of the photocarrier diffusion length upon cooling. It was found that the width of ...
Esquistossomose do sistema nervoso central relato de um caso
Ferreira,M. S.; Costa-Cruz,J. M.; Gomes,M. A.O comprometimento do sistema nervoso na esquistossomose mansônica é evento raramente diagnosticado na evolução desta parasitose. Os autores descrevem o caso de uma paciente de 23 anos, natural de São Francisco-MG, que apresentava há duas semanas quadro de ceíaléia, vômitos em jato, febre e sonolência; o exame neurológico mostrava rigidez de nuca, paresia com hipertonia muscular bilateral em membros superiores, ...
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