Document Type

Journal Article

Authors

Yong Zhou, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Huilun Chen, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Jun Yao, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Minyan He, State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University
Yang Si, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Liang Feng, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Fei Wang, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Gejiao Wang, State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University
Martin M.F. Choi, Department of Chemistry, Hong Kong Baptist UniversityFollow

Department/Unit

Department of Chemistry

Title

Influence of clay minerals on the Bacillus halophilus Y38 activity under anaerobic condition

Language

English

Abstract

Studies of interaction between clay minerals and Bacillus halophilus Y38 have provided basic information on extremophile growth and physiological characteristics in hypersaline environments, which are of growing concern in microbiology, geobiology, environmental and pharmaceutical researches. In this study, we investigated B. halophilus Y38 strain growing in HGM hypersaline medium (sodium ion concentration >55mgmL-1, chloride ion concentration >80mgmL-1), with smectite, rectorite and kaolinite of different aggregate sizes (100μm, 100-50μm, and <50μm, respectively). Metabolic heat flow significantly increased in smaller particles, indicating that the stimulation of the B. halophilus Y38 growth by the clay minerals increased with decreasing aggregate sizes, and, thus, the close relationship between the bacterial growth and the mineral surface area. The CO2 flux (FCO2), total thermal effect (Qtotal), cell growth rate (Kcell) and protein synthesis rate (kprotein) were the key physiological parameters in metabolic and energy conservation reactions. These metabolic results showed that the stimulation by clay minerals on the B. halophilus activity was in the order smectite > rectorite > kaolinite. Our data may provide a strategy to evaluate the influence of clay minerals on the microbial growth and cell activity, and supplied a new experimental procedure to study interactions between minerals and microorganisms. © 2010.

Keywords

Clay minerals, Extremophiles, Microcalorimetery, Salty environments

Publication Date

2010

Source Publication Title

Applied Clay Science

Volume

50

Issue

4

Start Page

533

End Page

537

Publisher

Elsevier

DOI

10.1016/j.clay.2010.10.008

Link to Publisher's Edition

http://dx.doi.org/10.1016/j.clay.2010.10.008

ISSN (print)

01691317

ISSN (electronic)

18729053

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