Biologically influenced mineralization either on the surfaces of, or in close proximity to bacterial cells may produce minerals that display distinct mineralogical or morphological features as a consequence of the microbial influence on the precipitation process. Characterizing such distinguishing features could potentially facilitate identification of early life in the geological record.

Many recent investigations have aimed to identify unique ‘markers’ indicative of biologically influenced mineralization, and to constrain the mechanisms controlling such precipitation. This study investigated the effects of bacterial extracellular polymers (EPS) on calcium carbonate morphology and polymorphism. Free-drift mineralization experiments were conducted using cells of the EPS-producing...

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