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The photo-dynamic action of neutral red on Triturus viridescens viridescens

, : The photo-dynamic action of neutral red on Triturus viridescens viridescens. Jour Exp Zool 83(2): 161-190

The photodynamic effect of neutral red on the integument of T. viridescens was the checking of divisions in 2 places in metaphase and in prophase. If checked at metaphase the process of mitosis was completed normally. If checked at prophase the following abnormalities of cell division arose: pycnosis, pseudoamitosis, fractional nuclei, followed by complete cessation of mitotic activity. In newts kept for 24 hrs. in diffuse light in a solution of 1:10,000 neutral red, after one of staining in the dark and 1 hr. of irradiation, the integument showed abnormal resting cells, cells with extrusions of chromosomes through the nuclear membrane and finally disintegration and death. The same was true in animals kept for 26 hrs. in neutral red in diffuse light. If newts were placed in pond water immediately following 1 hr. of staining in the dark and 1 hr. of irradiation in a 1:10,000 neutral red soln., normal karyokineses reappeared in 96 hrs.


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