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Production of bioethanol from sweet potato, agro industrial wastes
Raposo, Sara; Marques, L.; Tavares, C.; Duarte, C.; Lima-Costa, Maria EmíliaOne fraction of the existent petroleum is not extractable or the difficulties associated to extraction are very expensive making them unviable. This situation leads to a decrease in petroleum stocks all over the world and a resulting increment on its price, affecting in particular the transportation sector, since there is no relevant alternative to fossil petroleum.
Cost-effective bioethanol production at low content of nitrogen source from car...
Raposo, Sara; Tavares, C.; Rodrigues, B.; Lima-Costa, Maria Emília; Quintas, Célia; Rodrigues, F.Ethanol, as biofuel, has received great interest in the latest decades due to its potential as an alternative transport fuel. Nowadays, ethanol can be produced through fermentative processes, using sugar rich agricultural raw material and it may have a significant role in reducing environmental impact of fossil fuels.
Development of an empirical correlation for Newtonian and non-Newtonian fluids ...
Raposo, Sara; Azevedo, F.; Lima-Costa, Maria EmíliaMost of animal and plant cell cultures present a non-Newtonian behaviour that has a deep effect on the technological performance of bioreactors, affecting the pattern of mixing, the power input required and on the mass and energy transfer as well. In aerobic cultures, the oxygen mass transfer is still a bottleneck, particularly at industrial scale-up, where the high-cell-density biomass and production of metabo...
Sustainable bioethanol production using agro-industrial by-products
Pardão, J. M.; Diaz, I.; Raposo, Sara; Manso, Teresa; Lima-Costa, Maria EmíliaThis work aimed to evaluate a sustainable bioethanol production by a laboratorial isolate strain of Saccharomyces cerevisiae, along with the use of agro-industrial by-products as carbon source. The effect of several carbon sources and their concentrations was studied using carob pod extract (CPE) and beet molasses (BM) and compared with glucose and sucrose as conventional carbohydrates at different concentra...
Application of the focused beam reflectance measurement method (FBRM) to the ch...
Jeffers, Paul; Raposo, Sara; Lima-Costa, Maria Emília; Kieran, Patricia; Glennon, B.The ability to determine biomass levels and organism morphological characteristics is of importance in many bioprocesses.
Saline stress and cell toxicity evaluation using suspended plant cell cultures ...
Lima-Costa, Maria Emília; Ferreira, A. L.; Duarte, Amílcar; Beltrão, J.Crop salt damage consists, usually, of leaf burn and defoliation, and it is associated with accumulation of toxic levels of sodium and/or chloride in leaf cells (Storey and Walker, 1999). The cell and tissue culture are simple biological systems that offer a direct approach to the metabolic changes. The plant cell growth in a controlled environment, as a bioreactor, is a unique tool for cell ion transport studi...
Evaluation of the potential biotoxicity/essentiality of Zinc and Cadmium in sus...
Raposo, Sara; Oliveira, M. A.; Lima-Costa, Maria EmíliaFrom general biological, as well from plant physiological point of view, essential and non-essential heavy metals can be distinguished (Clijsters et al., 1999).
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