Abstract: GROWTH ACCELERATION AND PHOTOSYNTHESIS OF THE SCENEDESMUS ALGAE AND COCCONEIS ALGAE IN DEUTERIUM WATERLiu Feng Wang Wenqing(Department of Technical Physiscs, Peking University, Beijing 100871)Shi Dingji(Institute of Botany, the Chinese Academy of Sciences, Beijing 100044)Luo Shanggeng(China Institute of Atomic Energy, Beijing 102413)ABSTRACTIn order to find new way to treat the radioactive tritium waste water, scenedesmus algae and cocconeis algae are cultured in medium which contains 30% (w) deuterium water. During different time, activities of photosymthesis, absorption spectrum, growth rate and lowtemperature fluorescence spectrum are measured. Accelerated growth is found in the deuterium water compared to the normal water. Activities of photosnythesis show the similar result (Fv/Fm) to the growth data. It is also concluded from lowtemperature fluorescence spectra that algae activities in the deuterium water, which are expressed by PSⅠ/PSⅡ,are more sensitive than those in the normal water.Key words Scenedesmus algae Cocconeis algae Deuterium water