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Cell membrane damage induced by phenolic acids on wine lactic acid bacteria
Campos, F.M.; Couto, J.A.; Figueiredo, A.R.; Tóth, I.V.; Rangel, A.O.S.S.; Hogg, T.A.The aim of this work was to investigate the effect of phenolic acids on cell membrane permeability of lactic acid bacteria from wine. Several phenolic acids were tested for their effects on the cell membrane of Oenococcus oeni and Lactobacillus hilgardii by measuring potassium and phosphate efflux, proton influx and by assessing culture viability employing a fluorescence technique based on membrane integrity. T...
Modeling and simulation of wetted porous thermal barriers operating under high ...
Costa, V. A. F.; Mendonça, M. L.; Figueiredo, A. R.Porous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer i...
On the validity of lumped capacitance approaches for the numerical prediction o...
Ruivo, C. R.; Costa, J. J.; Figueiredo, A. R.In the present work, a detailed model of simultaneous heat and mass transfer through a desiccant micro-porous medium of a channel wall of compact heat and mass exchangers, such as desiccant wheels, was developed. The relevant phenomena considered by this model within the porous medium are surface diffusion of the adsorbed water, Knudsen diffusion of water vapour, heat conduction and the sorption process. A one-...
Cell membrane damage induced by phenolic acids on wine lactic acid bacteria
Campos, F. M.; Couto, J. A.; Figueiredo, A. R.; Tóth, I. V.; Rangel, A. O. S. S.; Hogg, T. A.
Influence of phenolic compounds on glucose and organic acids metabolism of wine...
Bilé, T. I.; Sá, F. S.; Campos, F. M.; Figueiredo, A. R.; Couto, J. A.; Hogg, T. A.
Fluorimetric detection of cell membrane lesions in wine lactic acid bacteria ex...
Moreira, J. M.; Reis, O. A.; Campos, F. M.; Tóth, I. V.; Figueiredo, A. R.; Couto, J. A.; Rangel, A. O. S. S.; Hogg, T. A.
Experimental analysis of the use of wet porous media for thermal protection aga...
Figueiredo, A. R.; Costa, J. J.An experimental technique is implemented to analyse the behaviour of a wet porous medium under the direct impact of a flame, and the possibility of its use as a thermal protection device. The data obtained show that relatively thin and light thermal protections, with moderate values of water consumption, can be developed, presenting high levels of protection. The presentation of the data in a dimensionless form...
Numerical simulation and experimental validation of heat transfer within rotati...
Raimundo, A. M.; Oliveira, L. A.; Figueiredo, A. R.A control volume type numerical methodology for the analysis of steady three-dimensional rotating flows with heat transfer, in both laminar and turbulent conditions, is implemented and experimentally tested. Non-axisymmetric momentum and heat transfer phenomena are allowed for. Turbulent transport is alternatively represented through three existing versions of the k-ε model that were adjusted to take into accou...
Aspectos do Comportamento Higrotérmico de um Edifício de Elevada Inércia Térmic...
Gaspar, A.; Quintela, D. A.; Figueiredo, A. R.Neste trabalho analisa-se, de forma preliminar, o comportamento higrotérmico de uma biblioteca construída no século XVIII, pertencente ao núcleo histórico-arquitectónico da Universidade de Coimbra, a partir de dados registados numa campanha de medidas executadas por termo-higrómetros, durante os meses de Junho e Julho de 1993. Caracteriza-se a envolvente do edifício do ponto de vista da sua inércia térmica e si...
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