Aloni, B., Research and Development Authority and Department of Biology, University of the Negev, Beer ShevaIsrael
Shinitzky, M., Department of Biophysics, The Weizmann Institute of Science, RehovotIsrael
Livne, A., Research and Development Authority and Department of Biology, University of the Negev, Beer ShevaIsrael

Microviscosity, η and fusion energy, ΔE, in the lipid core of intact human erythrocyte membranes, their ghost membranes and in liposomes prepared from their lipid extracts were determined between 0 and 40°C by a fluorescence-polarization technique which was previously utilized for similar purposes. All three systems possess ΔE = 7 kcal/mole but the η value in the ghost membrane is greater by 50% than that of the intact cell and is similar to that found in the liposomes. © 1974.