Editor: GianFranco Donelli
Effect of simulated microgravity on growth and production of exopolymeric substances of Micrococcus luteus space and earth isolates
Article first published online: 14 APR 2010
© 2010 Empa - Laboratory for Biomaterials. Journal compilation © 2010 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd
FEMS Immunology & Medical Microbiology
Special Issue: Biofilms
Volume 59, Issue 3, pages 350–356, August 2010
How to Cite
Mauclaire, L. and Egli, M. (2010), Effect of simulated microgravity on growth and production of exopolymeric substances of Micrococcus luteus space and earth isolates. FEMS Immunology & Medical Microbiology, 59: 350–356. doi: 10.1111/j.1574-695X.2010.00683.x
- Issue published online: 13 JUL 2010
- Article first published online: 14 APR 2010
- Received 25 November 2009; revised 23 February 2010; accepted 16 March 2010.Final version published online 12 May 2010.
- Gram-negative bacteria;
- exopolymeric substances;
Microorganisms tend to form biofilms on surfaces, thereby causing deterioration of the underlaying material. In addition, biofilm is a potential health risk to humans. Therefore, microorganism growth is not only an issue on Earth but also in manned space habitats like the International Space Station (ISS). The aim of the study was to identify physiological processes relevant for Micrococcus luteus attachment under microgravity conditions. The results demonstrate that simulated microgravity influences physiological processes which trigger bacterial attachment and biofilm formation. The ISS strains produced larger amounts of exopolymeric substances (EPS) compared with a reference strain from Earth. In contrast, M. luteus strains were growing faster, and Earth as well as ISS isolates produced a higher yield of biomass under microgravity conditions than under normal gravity. Furthermore, microgravity caused a reduction of the colloidal EPS production of ISS isolates in comparison with normal gravity, which probably influences biofilm thickness and stability as well.