Modern problems of genetics, radiobiology, radioecology and evolution : the Second International Conference dedicated to the 105th anniversaru of the birth of N.W. Timofeeff-Ressovsky and the 70th anniversary of the paper "On the Nature of Gene Mutations and Gene Structure" by N. W/ Timofeeff-Ressovsky, K. G. Zimmer, and M. Delbruck (Yerevan, September 8-11, 2005) (2005)