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Marine bacteria and biogeochemical cycling of iron in the oceans (1999)

Tortell, Philippe D ; Maldonado, Maria T ; Granger, Julie ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology ecology 29 (1999), S. 0

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ISSN: 1574-6941

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Prokaryotic microbes play a critical role in oceanic Fe cycling. They contain most of the biogenic Fe in offshore waters and are responsible for a large portion of the Fe uptake by the plankton community. In the subarctic North Pacific, surface populations of heterotrophic species assimilate more than 50% of the dissolved Fe and thus compete directly with phytoplankton for this limiting resource. In oligotrophic tropical and subtropical waters, photosynthetic bacteria become more important in Fe cycling as the number of unicellular cyanobacteria increases and the nitrogen-fixing Trichodesmium, which contains most of the biogenic Fe in the mixed layer, becomes abundant. Like their terrestrial counterparts, heterotrophic and phototrophic marine bacteria produce Fe-binding siderophores that are involved in Fe acquisition. Evidence exists that bacteria may modify Fe chemistry in the sea through the production of these ligands and thereby play a significant role in regulating production of eukaryotic phytoplankton.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1574-6941.1999.tb00593.x

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The role of heterotrophic bacteria in iron-limited ocean ecosystems (1996)

Tortell, Philippe D. ; Maldonado, Maria T. ; Price, Nell M.

[s.l.] : Nature Publishing Group

Nature 383 (1996), S. 330-332

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] We measured intracellular iron concentrations of five oceanic bacterial isolates maintained in synthetic ocean water medium9 enriched with an organic carbon substrate extracted from a diatom culture. Under iron-sufficient conditions (concentrations of inor-ganic iron, [Fe'] 40 nM), bacterial iron ...