Geology Reference
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are known to exist in natural subterranean situations
(see Blyth & Frisia 2008). Consequently, lessons
learnt from the study of microbially mediated pre-
cipitation in tufa systems may well be relevant to
understanding the geochemical records of spe-
leothems. Of particular importance may be the
mechanism of 'colloid filtration', whereby the EPS
molecules collect ions in one location and then con-
centrate and release them back into solution at a
second location, potentially a significant distance
away. This mechanism may also be assumed to
play some role in promoting in-sediment precipi-
tation within lakes.
C
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The authors are pleased to thank Dr John Adams for assist-
ance with the staining and identification of the bacteria and
phototrophic cyanobacteria. Thanks also to Mr Tony Sin-
clair for assistance with the scanning electron microscopy.
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