Bioprocesses
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Produção de ácido gama-poliglutâmico através do aproveitamento de soro de leite e de glicerol residual de biodisel
O ácido -poliglutâmico (-PGA) é um biopolímero aniônico produzido por microrganismos do gênero Bacillus em cultivo sólido ou submerso. Esse polímero é biodegradável, comestível, atóxico para humanos e para o ambiente e solúvel em água. Por estas e outras características ele pode ser aplicado nas indústrias de alimentos, química e farma
Publicado em: 2011
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14. A fast and systematic procedure to develop dynamic models of bioprocesses: application to microalgae cultures
The purpose of this paper is to report on the development of a procedure for inferring black-box, yet biologically interpretable, dynamic models of bioprocesses based on sets of measurements of a few external components (biomass, substrates, and products of interest). The procedure has three main steps: (a) the determination of the number of macroscopic biol
Brazilian Journal of Chemical Engineering. Publicado em: 2010-09
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15. Simulação e controle do processo de produção de levedura
The yeast Saccharomyces cerevisiae can be useful in several ways in bioprocesses. It is widely used in anaerobic processes for production of bioethanol at Brazilians plants. It is also of great importance as bakers yeast, where the product is the biomass. Moved by the industrial interest this work will aggregate knowledge in the improvement of techniques of
Publicado em: 2009
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16. Comparative study of the performance of fuzzy and conventional controllers applied in a bioprocess / Estudo comparativo do desempenho de controladores fuzzy e convencional aplicados em um bioprocesso
The use of fuzzy controllers in bioprocesses has increased greatly in the last few years. In conventional controllers, assumptions and simplifications are often made to build a precise mathematical model that may be far from the real situation. In contrast, fuzzy controllers are an attractive technique for the control of plants that are ill-defined or non-li
Publicado em: 2007
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17. Theoretical and experimental study of the effects of scale-up on mixing time for a stirred-tank bioreactor
Mixing time is one of the criteria most widely used to characterize mixing intensity in bioprocesses. In bioreactors, mixing mainly depends on amount of energy consumed, reactor and stirrer shapes, airing speed and the rheology of the medium. In this work we experimentally determined the mixing times for a lab-scale bioreactor equipped with a stirrer propell
Brazilian Journal of Chemical Engineering. Publicado em: 2006-03
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18. Expert system development for aid n the Bioprocesses design and operation / Desenvolvimento de um sistema especialista para auxilio no projeto e operação de processos biotecnologicos
Os processos biotecnológicos ou Bioprocessos necessitam de maiores cuidados do que a maioria dos processos químicos comuns devido, principalmente, à sensibilidade a variações nos estados do sistema como, por exemplo, temperatura e concentração. O crescente aumento da importância dos Bioprocessos e a maior dificuldade em seu controle e simulação res
Publicado em: 2006
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19. Application of the wavelet image analysis technique to monitor cell concentration in bioprocesses
The growth of cells of great practical interest, such as, the filamentous cells of bacterium Streptomyces clavuligerus, the yeast Saccharomyces cerevisiae and the insect Spodoptera frugiperda (Sf9) cell, cultivated in shaking flasks with complex media at appropriate temperatures and pHs, was quantified by the new wavelet transform technique. This image analy
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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20. Aplicação de técnicas de análise de imagens na quantificação da concentração celular no cultivo de células de inseto.
Paradoxally, in spite of the cellular concentration to be the most important variable in a bioprocess, in practice is the less monitored as a consequence of the experimental difficulty found in its quantification in an aseptic, non invasive, discriminative (viable and not viable), in real time and, above all, in reliable way. For this reason, little progress
Publicado em: 2004
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21. The chemistry involved in the steam treatment of lignocellulosic materials
Pretreatment of lignocellulosic materials is essential for bioconversion because of the various physical and chemical barriers that greatly inhibit their susceptibility to bioprocesses such as hydrolysis and fermentation. The aim of this article is to review some of the most important pretreatment methods developed to date to enhance the conversion of lignoc
Química Nova. Publicado em: 2003-12
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22. Simultaneous optimization of dynamic bioprocesses
It is known that the optimal control may introduce significant economical benefits into production processes, thus being an important and challenging research area with practical relevance. The modeling and optimization of biotechnological processes has been object of research and their related results have generated improvements in operating conditions and
Brazilian Journal of Chemical Engineering. Publicado em: 2002-12
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23. Amorphous layer around aragonite platelets in nacre
We reveal that the aragonite CaCO3 platelets in nacre of Haliotis laevigata are covered with a continuous layer of disordered amorphous CaCO3 and that there is no protein interaction with this layer. This finding contradicts classical paradigms of biomineralization, e.g., an epitaxial match between the structural organic matrix and the formed mineral. This f
National Academy of Sciences.
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24. Osmotic Stress Response: Quantification of Cell Maintenance and Metabolic Fluxes in a Lysine-Overproducing Strain of Corynebacterium glutamicum
Osmotic stress diminishes cell productivity and may cause cell inactivation in industrial fermentations. The quantification of metabolic changes under such conditions is fundamental for understanding and describing microbial behavior during bioprocesses. We quantified the gradual changes that take place when a lysine-overproducing strain of Corynebacterium g
American Society for Microbiology.