Uptake of lead by two populations of Grimmia doniana |
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Abstract: | AbstractAnalyses of populations of Grimmia doniana from Old Red Sandstone walls (Brecon Beacons, Breconshire) and vitrified lead slag (Charterhouse, Somerset) showed the former to have a low and the latter a high lead content. Lead in material from the field was shown to be ionically bound to an extracellular site. Uptake of lead from solutions of lead nitrate was by a passive physical process, without penetration of the cytoplasm. No difference in lead uptake capacity was detected between the two populations. The results are discussed in terms of a natural non-specific lead tolerance mechanism occurring in Grimmia doniana. |
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