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will probably be clarified by the continued cooperative efforts of
scientists such as those in the group that met in Berlin last
September. The staff of Dahlem Konferenzen is responsible for
making the meeting of this group memorably pleasant and pleasantly
mem- orable. Dr. Bernhard's gifts of charm, organizational skill,
and administrative toughness assured that the conference was run
elegantly, smoothly, and decisively, even down to the choice of
editors for this volume. Marie Cervantes-Waldmann performed minor
miracles extracting manuscripts gently but persistently from the
authors and in turning the typescripts into a book. The other staff
members of Dahlem Konferenzen were unfailingly helpful even under
trying circumstances. They will be well rememberedbyall who were
fortunate enough to be asked to Berlin for the first week in
September, 1980. Mineral Deposits and the Evolution of the
Biosphere, eds. H. D. Holland and M. Schidlowski, pp. 5-30. Dahlem
Konferenzen, 1982. Berl in, Heidelberg, New York: Springer-Verlag.
Microbial Processes in the Sulfur Cycle Through Time H. G. TrUper
Institut f. Microbiologie, Rheinische
Friedrich-Wilhelms-Universitat, 5300 Bonn 1, F. R. Germany
Abstract. Two microbial processes are involved in the sulfur cycle
of the earth's biosphere: anoxic dissimilatory sulfur oxidation by
phototrophic bacteria and dissimilatory sulfate reduction by
sulfate-reducing bacteria. In the presence of oxygen at chemoclines
and redoxclines dissimilatory sulfur oxidation by chemolithotrophic
bacteria (Thiobacillus, Beg- giatoa, and others) occurs. In
addition, dissimilatory sulfur reducing bacteria participate in the
sulfur cycle.
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