Computer Science
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.168....1g&link_type=abstract
Earth and Planetary Science Letters, Volume 168, Issue 1-2, p. 1-6.
Computer Science
4
Scientific paper
Rock magnetic measurements, including low temperature susceptibility and Curie Temperature experiments, show that the most recent sediments from the Bay of Vidy, close to Lausanne on the north shore of Lake Geneva, Switzerland, are rich in superparamagnetic magnetite. The 137Cs dated increase in magnetite concentration coincides with the beginning of sewage de-phosphatization by the addition of iron chloride. Extracts of fine-grained magnetite, imaged by transmission electron microscopy, form amorphous masses visually comparable to those detected as the product of extracellular magnetite production by bacteria. This is the first indication that extracellular, dissimilatory magnetite may survive and make a dominant contribution to the magnetic properties of sediments. Final confirmation of the bacterial origin of the magnetite will depend on rRNA sequencing.
Dominik J.
Gibbs-Eggar Z.
Jude B.
Loizeau Jean-Luc
Oldfield Frank
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