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Microbial Ecology

, Volume 47, Issue 2, pp 150–158 | Cite as

Microbial Monitoring of Spacecraft and Associated Environments

  • M. T. La Duc
  • R. Kern
  • K. Venkateswaran
Article

Abstract

Rapid microbial monitoring technologies are invaluable in assessing contamination of spacecraft and associated environments. Universal and widespread elements of microbial structure and chemistry are logical targets for assessing microbial burden. Several biomarkers such as ATP, LPS, and DNA (ribosomal or spore-specific), were targeted to quantify either total bioburden or specific types of microbial contamination. The findings of these assays were compared with conventional, culture-dependent methods. This review evaluates the applicability and efficacy of some of these methods in monitoring the microbial burden of spacecraft and associated environments. Samples were collected from the surfaces of spacecraft, from surfaces of assembly facilities, and from drinking water reservoirs aboard the International Space Station (ISS). Culture-dependent techniques found species of Bacillus to be dominant on these surfaces. In contrast, rapid, culture-independent techniques revealed the presence of many Gram-positive and Gram-negative microorganisms, as well as actinomycetes and fungi. These included both cultivable and noncultivable microbes, findings further confirmed by DNA-based microbial detection techniques. Although the ISS drinking water was devoid of cultivable microbes, molecular-based techniques retrieved DNA sequences of numerous opportunistic pathogens. Each of the methods tested in this study has its advantages, and by coupling two or more of these techniques even more reliable information as to microbial burden is rapidly obtained.

Keywords

International Space Station Microbial Detection Facility Surface Witness Plate Spacecraft Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Funding was provided by the Mars Program Office, and Advanced Environmental Monitoring and Control. Technical assistance by D. Pierson, R. Sumner, W. Nicholson, S. Chung, G. Kazarians, F. Chen, M. Kempf, G. Kuhlman, and T. Ma is appreciated. We are thankful to D. Jan, K. Buxbaum and T. Luchik for support and encouragement.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Biotechnology and Planetary Protection GroupJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109USA

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