In a minimal basal medium with glucose at pH 4.0 and 25 degrees C, a lowering of the magnesium and zinc concentrations or increase in the calcium concentration of the medium favoured the yeast-mycelium transition in Sporothrix schenckii. Addition of zinc (1 and 10 mM) inhibited mycelial development and induced reversion to a yeast-like morphology. EDTA and EGTA also delayed germ tube formation, possibly by their calcium-chelating effects or by altering intracellular concentrations of this or other ions. Ionophore X537A also caused a delay in germ tube formation, possibly by interfering with magnesium metabolism in these cells.
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Alsina et al. (1984) studied this question.
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