Abstract:The phycocycins (PC) from the thermophilic cyanobacterium Myxosarcina concinna Printz and the Chi a-containing liposomes were prepared and their spectral characteristics were measured before the energy transfer from PC to Chi a-containing liposomes was studied. It was found that the efficiency of light energy transfer was decreased when the surface of the vesicle bilayer was negatively charged. It was relatively increased when the membrane was incorporated with the positively-charged surfactaht, dioctadecy-ldimethylammonium chloride (DODAC), of increasing concentration from 0 to 30 mol%. These results indicated that the electrostatic force might have great effects on the energy transfer from phycocycins to Chi a-containing liposomes.