1. State Key Laboratory of Heavy Oil Processing and the Centre for Bioengineering and Biotechnology China University of Petroleum (East China) Changjiang West Road Qingdao 266580 China
2. Biological Physics Laboratory School of Physics and Astronomy The University of Manchester Oxford Road Manchester M13 9PL UK
3. ISIS Pulsed Neutron Source STFC Rutherford Appleton Laboratory Didcot Oxon OX11 0QX UK