The human fungal pathogen Candida albicans alkalinizes the local extracellular environment. Two colonies of C. albicans grown for 19 days on GM-bromocresol green agar, pH 4. The fungus actively raises the pH of its surrounding environment. This alkalinization converts the normally dull green medium to a strong teal blue, whilst the filamentous fringes of the colonies (white) extend away from each other.
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