1. Contribution from the Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, Poland, Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland, Nencki Institute of Experimental Biology, Pasteura 3, 02-093 Warsaw, Poland, and Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan