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ECB-ART-37592
Appl Environ Microbiol 2000 Nov 01;6611:4829-33. doi: 10.1128/AEM.66.11.4829-4833.2000.
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Marine planktonic archaea take up amino acids.

Ouverney CC , Fuhrman JA .


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Archaea are traditionally thought of as "extremophiles," but recent studies have shown that marine planktonic Archaea make up a surprisingly large percentage of ocean midwater microbial communities, up to 60% of the total prokaryotes. However, the basic physiology and contribution of Archaea to community microbial activity remain unknown. We have studied Archaea from 200-m depths of the northwest Mediterranean Sea and the Pacific Ocean near California, measuring the archaeal activity under simulated natural conditions (8 to 17 degrees C, dark and aerobic [corrected]) by means of a method called substrate tracking autoradiography fluorescence in situ hybridization (STARFISH) that simultaneously detects specific cell types by 16S rRNA probe binding and activity by microautoradiography. In the 200-m-deep Mediterranean and Pacific samples, cells binding the archaeal probes made up about 43 and 14% of the total countable cells, respectively. Our results showed that the Archaea are active in the uptake of dissolved amino acids from natural concentrations (nanomolar) with about 60% of the individuals in the archaeal communities showing measurable uptake. Bacteria showed a similar proportion of active cells. We concluded that a portion of these Archaea is heterotrophic and also appears to coexist successfully with Bacteria in the same water.

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Genes referenced: LOC100887844 LOC115919910 LOC115925415

References [+] :
Andreasen, Application of microautoradiography to the study of substrate uptake by filamentous microorganisms in activated sludge. 1997, Pubmed