Oxygen availability has been identified as a major factor in governing the morphology of the lactose-fermenting yeast, Kluyveromyces marxianus var. marxianus (formerly fragilis) NRRLy241.5. In this particular strain, filamentous cells ( F forms) predominate during the initial stages of aerobic propagation whilst budding yeast cells ( Y forms) predominate during anaerobiosis. In other K . marxianus strains, and in Candida pseudotropicalis, budding cells predominate irrespective of oxygen availability. Increase…
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