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Summary: Scanning electron microscopic studies showed that the morphology of Penicillium chrysogenum Thom in fermentation cultures changed in response to changes in COz concentration. At influent COz partial pressures between 0.03% (air) and 8 %, the predominant morphological form was filamentous, whereas at 15% CO2, swollen and stunted hyphae predominated, and a significant quantity of spherical or yeast-like cells was observed.
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