Oxygen Volumetric Mass Transfer Coefficient Kla
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Effects of oxygen transfer coefficient on dihydroxyacetone production from crude glycerol
Abstract The principal objective of this study was to evaluate the kinetics of dihydroxyacetone production by Gluconobacter frateurii CGMCC 5397 under different oxygen volumetric mass transfer coefficient (kLa) conditions in submerged bioreactors using biodiesel-derived crude glycerol as the carbon source. kLa is a key fermentation parameter for the producti
Braz. J. Microbiol.. Publicado em: 2016-03
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2. Efeito do uso de glicerol residual e carreadores de oxigênio sobre a produção de lipases de Staphylococcus warneri EX17
A transferência de oxigênio é um fator limitante para grande parte dos cultivos em biorreatores que operam com organismos estritamente aeróbios devido à baixa solubilidade do oxigênio em meios de cultivo. A introdução de meios não convencionais, como polidimetilsiloxanos (PDMS), em biorreatores pode ser vista como uma melhoria para o ajuste desses p
Publicado em: 2011
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3. Production and extraction of clavulanic acid from Streptomyces spp. by extractive fermentation using aqueous two-phase system / Produção e extração de ácido clavulânico de Streptomyces spp. por fermentação extrativa utilizando sistemas de duas fases aquosas
Clavulanic acid (CA) is a potent inhibitor of β-lactamases used in the medical field. Alternative methods, economic and simple purification are of great interest. This PhD project aims to produce and extract clavulanic acid of Streptomyces spp. By extractive fermentation using aqueous two-phase system (ATPS) - Polyethylene glycol (PEG)/phosphate salts.
Publicado em: 2010
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4. Hidrodinâmica e transferência de oxigênio em três biorreatores Airlift de circulação interna geometricamente semelhantes
Internal-loop airlift reactors (ALR) are a special class of pneumatic reactors. The use of this type of reactor has been attractive for chemical and biological reactions because of their simple construction without moving parts and low energy costs when compared with stirred tank reactors. In the present work, a study related to hydrodynamic and oxygen trans
Publicado em: 2009
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5. The effects of geometry and operational conditions on gas holdup, liquid circulation and mass transfer in an airlift reactor
In airlift reactors transport phenomena are achieved by pneumatic agitation and circulation occurs in a defined cyclic pattern through a loop. In the present work, the effect of geometrical relations on gas holdup and liquid velocity, and consequently on the gas-liquid mass transfer coefficient, was studied in a 6-liter airlift bioreactor with A D/A R = 0.63
Brazilian Journal of Chemical Engineering. Publicado em: 2003-10
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6. Studies on the rheology and oxygen mass transfer in the clavulanic acid production by Streptomyces clavuligerus
In the present work rheological characteristics and volumetric oxygen transfer coefficient (kLa) were investigated during batch cultivations of Streptomyces clavuligerus NRRL 3585 for production of clavulanic acid. The experimental rheological data could be adequately described in terms of the power law model and logistic equation. Significant changes in the
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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7. Production of Bacterial Cells from Methane
A mixed methane-oxidizing bacterial culture capable of stable and predictable growth in continuous culture was isolated. The culture consisted of two types of gram-negative nonsporulating rods resembling pseudomonads. The culture grew well at 45 C on an inorganic medium without asepsis. Specific metal requirements for Ca2+, Cu2+, MoO42−, Zn2+, Mn2+, Mg2+,