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. 1994 Aug;60(8):2697–2703. doi: 10.1128/aem.60.8.2697-2703.1994

Changes in Bacteria Recoverable from Subsurface Volcanic Rock Samples during Storage at 4°C

Dana L Haldeman 1, Penny S Amy 1,*, David C White 2, David B Ringelberg 2
PMCID: PMC201711  PMID: 16349343

Abstract

The abundance of viable microorganisms recovered from deep subsurface volcanic rock samples increased after rock perturbation and storage for 1 week at 4°C, while the diversity and evenness of recoverable heterotrophic bacterial communities generally decreased. One sample of each morphologically distinct colony type, recovered both before and after storage of U12n rock samples, was purified and characterized by fatty acid methyl ester (MIDI) and API rapid NFT strips. As determined by MIDI cluster analysis, the composition of the recoverable microbial communities changed with storage of rock samples; some groups of organisms were recovered only before, only after, or at both sample times. In general, the isolates recovered only after storage of rock samples had a greater ability to utilize the carbohydrates included in API test strips and had faster generation times than isolates recovered only on initial plating. The nutritional versatility and faster growth rates of organisms recovered in higher proportions after sample storage provide evidence that some microbial community changes may be due to the proliferation of a few bacterial types. However, because some new genera are recovered only after storage, the possibility also exists that dormant bacterial types are resuscitated during sample perturbation and storage.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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