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Gyorgyi Ronto*1, Attila Berces1, Helmut Lammer2, Charles S. Cockell3, Gregorio J. Molina-Cuberos4, Manish R. Patel5 and Franck Selsis6

1MTA-SE Research Group for Biophysics, Semmelweis University, Budapest, Hungary;

2Space Research Institute, Department of Extraterrestrial Physics, Austrian Academy of Sciences, Graz, Austria;

3British Antarctic Survey, High Cross, Cambridge, UK;

4Deptartmento Fisica, Facultad de Quimica, Universidad de Murcia, Murcia, Spain;

5PIanetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes, UK and

6Centro de Astrobiologia (INTA-CSIC), Madrid, Spain

Received 21 February 2002; accepted 20 October 2002

*To whom correspondence should be addressed at: MTA-SE Research Group for Biophysics, Budapest, VIII Puskin-u 9, P.O. Box 263, H-1444, Budapest, Hungary. Fax: 36-1-266-6656; e-mail: ronto@puskin. sote.hu