Survivability of bacteria ejected from icy surfaces after hypervelocity impact

Burchell, M.J. and Galloway, J.A. and Bunch, A.W. and Brandao, P.F.B. (2003) Survivability of bacteria ejected from icy surfaces after hypervelocity impact. Origins of Life and Evolution of the Biosphere, 33 (1). pp. 53-74. ISSN 0169-6149 . (The full text of this publication is not available from this repository)

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Abstract

Both the Saturnian and Jovian systems contain satellites with icy surfaces. If life exists on any of these icy bodies (in putative subsurface oceans for example) then the possibility exists for transfer of life from icy body to icy body. This is an application of the idea of Panspermia, wherein life migrates naturally through space. A possible mechanism would be that life, here taken as bacteria, could become frozen in the icy surface of one body. If a high-speed impact occurred on that surface, ejecta containing the bacteria could be thrown into space. It could then migrate around the local region of space until it arrived at a second icy body in another high-speed impact. In this paper we consider some of the necessary steps for such a process to occur, concentrating on the ejection of ice bearing bacteria in the initial impact, and on what happens when bacteria laden projectiles hit an icy surface. Laboratory experiments using high-speed impacts with a light gas gun show that obtaining icy ejecta with viable bacterial loads is straightforward. In addition to demonstrating the viability of the bacteria carried on the ejecta, we have also measured the angular and size distribution of the ejecta produced in hypervelocity impacts on ice. We have however been unsuccessful at transferring viable bacteria to icy surfaces from bacteria laden projectiles impacting at hypervelocities.

Item Type: Article
Additional information: 0169-6149 (Print) Journal Article
Uncontrolled keywords: *Bacterial Physiology *Environmental Microbiology *Exobiology *Extraterrestrial Environment *Ice Models, Biological
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Mark Burchell
Date Deposited: 05 Sep 2008 13:06
Last Modified: 14 Jan 2010 14:19
Resource URI: http://kar.kent.ac.uk/id/eprint/5026 (The current URI for this page, for reference purposes)
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