Hohe Strahlenresistenz der Aktivit�t und der lichtinduzierten Aktivit�tssteigerung der NADP-abh�ngigen Glycerinaldehyd-3-Phosphat-Dehydrogenase in Ankistrodesmus braunii

Abstract

In Ankistrodesmus braunii, a unicellular alga, the activity of NADP-dependent glyceraldehyde phosphate dehydrogenase (GPD) in darkness is very resistant to X-rays. The light-induced increase in the activity of this enzyme within one minute is also not affected by irradiation. Doses up to 1060 Krad had no inhibitory effect. The increase of GPD activity during the life cycle, however, is very sensitive to X-rays.