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Thermophilic bacteria in cool temperate soils: are they metabolically active or continually added by global atmospheric transport?

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Marchant, Roger, Franzetti, Andrea, Pavlostathis, Spyros G., Tas, Didem Okutman, Erdbrugger, Isabel, Unyayar, Ali, Mazmanci, Mehmet A. and Banat, Ibrahim (2008) Thermophilic bacteria in cool temperate soils: are they metabolically active or continually added by global atmospheric transport? APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 78 (5). pp. 841-852. [Journal article]

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DOI: 10.1007/s00253-008-1372-y

Abstract

Thermophilic soil geobacilli isolated from cool temperate geographical zone environments have been shown to be metabolically inactive under aerobic conditions at ambient temperatures (-5 to 25 degrees C). It is now confirmed that a similar situation exists for their anaerobic denitrification activity. It is necessary therefore to determine the mechanisms that sustain the observed significant viable populations in these soils. Population analysis of thermophiles in rainwater and air samples has shown different species compositions which support the view that long distance global transport and deposition in rainwater is a possible source of replenishment of the soil thermophile populations. Survival experiments using a representative Geobacillus isolate have indicated that while cells lose viability rapidly at most temperatures, populations can increase only when the temperature allows growth to take place at a rate which exceeds death rate. Long term (9-month) experiments at 4 degrees C show population increases which can be accounted for by very slow growth rates complemented by negligible death rates. These results are interpreted in the context of current hypotheses on the biogeography patterns of bacteria.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Pharmaceutical Science and Practice
ID Code:2690
Deposited By:Professor Roger Marchant
Deposited On:16 Dec 2009 09:33
Last Modified:16 May 2012 11:22

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