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Science 20 January 2006:
Vol. 311. no. 5759, p. 299
DOI: 10.1126/science.311.5759.299n
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This Week in Science
Some types of microaerophilic marine bacteria contain magnetosomes, which are thought to help the organisms to avoid exposure to high concentrations of oxygen. In the Northern Hemisphere, these bacteria were assumed to seek geomagnetic north, so that in high latitudes they swim down away from oxygenated water, the converse was assumed to occur in the Southern Hemisphere. Simmons et al. (p. 371) now challenge this dogma and show that the Northern Hemisphere magnetotactic bacteria have mixed polarity with occasional blooms of south-seeking barbell-shaped bacteria. Rod-shaped greigite-producing bacteria tend to aggregate in more reducing conditions, whereas south-seeking magnetite-containing bacteria form cocci or short chains of cocci (barbells) under more oxidizing conditions.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
