1. Department
of Applied Physics, The Hebrew University of Jerusalem, Edmond
J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
2. Institute
of Physics, Kazan Federal University, Kremlevskaya str.18, Kazan 420008, Tatarstan, Russia
3. Department
of Biological Regulation, Weitzman Institute of Science, Rehovot 761001, Israel