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  Poly-beta-hydroxy alkanoate and the support of river biofilm metabolism following radical changes in environmental conditions

Freeman, C., Lock, M. A., & Marxsen, J. (1993). Poly-beta-hydroxy alkanoate and the support of river biofilm metabolism following radical changes in environmental conditions. Hydrobiologia, 271(3), 159-164.

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 Creators:
Freeman, Christopher, Author
Lock, Maurice A., Author
Marxsen, Jürgen1, Author           
Affiliations:
1Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976546              

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Free keywords: river biofilm; environmental change; acclimation; PHA; extracellular enzymes
 Abstract: Endogenous carbon reserves such as poly-beta-hydroxy alkanoate (PHA) can sustain microbial viability during conditions of nutrient deprivation. Microbial extracellular enzyme activities under one set of environmental conditions might be wholly inappropriate for another, and thus PHA might also serve as an energy source as the biofilm acclimates to a changed environment. In order to test this hypothesis, radical changes in environmental conditions were imposed upon river biofilms by transferring them between three rivers of acid, circum-neutral and alkaline pH. The findings supported the hypothesis; each of the transfers resulted in reduced PHA levels, while the physiology of the biofilm (metabolic activity, population density, phosphatase & glucosidase activities) acclimated to the environmental conditions of the recipient site. The greatest PHA depletion was observed when the magnitude of the imposed change resulted in an inability of phosphatase enzyme to respond to the change. The implicit greater dependence on the reserves of PHA, is similarly consistent with the hypothesis.

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Language(s): eng - English
 Dates: 1993
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 237641
Other: 0867
 Degree: -

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Title: Hydrobiologia
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 271 (3) Sequence Number: - Start / End Page: 159 - 164 Identifier: ISSN: 00188158