Abstract
Nostoc calcicola cells exposed to mercuric chloride (0.05–0.25 μM), methyl mercuric chloride (0.05–0.15 μM) and the fungicide ceresan (phenyl mercuric acetate; 0.05–0.20 μM) showed sensitivity in the sequence: methyl mercury<phenyl mercury<inorganic mercury. With the exception of inorganic Hg, cyanobacterial cells showed recovery from lethal concentrations of both the organomercurials, thus suggesting their possible volatilization. The uptake comparisons put methyl mercury as the most highly mobile species as evidenced by the bioconcentration factor (2.7×103) over phenyl mercuric acetate (0.51×103); inorganic mercury occupied the intermediate position with a bioconcentration factor of 1.32×103. The data infer that larger molecules of organomercurials may not be taken up by cells at the rate and extent comparable to the smaller species.
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