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

Yong Zhou, Huilun Chen, Jun Yao*, Minyan He, Yang Si, Liang Feng, Fei Wang, Gejiao Wang, Martin M F CHOI

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)533-537
Number of pages5
JournalApplied Clay Science
Volume50
Issue number4
DOIs
Publication statusPublished - Dec 2010

Scopus Subject Areas

  • Geology
  • Geochemistry and Petrology

User-Defined Keywords

  • Clay minerals
  • Extremophiles
  • Microcalorimetery
  • Salty environments

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