Microorganisms Who Love Acid
Acid-tolerance is another survival factor shown by various groups of primitive microbes of relevance to early Earth and potential relevance to Hesperian Mars. Some are photosynthetic, such as the primitive unicellular red alga Cyanidium caldarium, which can tolerate pH values of 0.05. Others are chemosynthetic, such as the extremely acidiphilic archaebacterium Sulpholobus acidocaldarius. They are often also thermophilic as befits their primitive origins.
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