Ontology type: schema:ScholarlyArticle Open Access: True
1983-07
AUTHORSHarry Hiemstra, Lubbert Dijkhuizen, Wim Harder
ABSTRACTIn the yeast Hansenula polymorpha an oxygen-requiring enzyme, alcohol oxidase, catalyzes the conversion of methanol into formaldehyde. After growth on methanol cells of the organism were harvested and entrapped in barium-alginate gels. The diffusion of oxygen towards these cells is seriously hindered by the polymer network. This caused significant changes in the kinetics of methanol oxidation by the immobilized cells as compared to that observed with cells free in suspension. The apparent KS(O2) of the immobilized cells was dependent upon the density of the cells in the alginate beads and the bead radius. Using a well-known theoretical model, originally developed to describe the kinetics of oxygen diffusion in mold pellets, the diffusion coefficient for oxygen in barium-alginate gels was estimated. This coefficient was only 25% of that in water. The model also allowed an adequate simulation of the observed kinetics of methanol oxidation by the immobilized cells. More... »
PAGES189-196
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