Photophobic and phototactic responses of Amoeba proteus in KCN and SHAM solutions

The effects of the metabolic inhibitors KCN and SHAM on phototaxis and photophobic response in Amoeba proteus have been studied. Both drugs neither change amoebae photophobic response nor the phototactic reaction. The results indicate clearly that the negative phototactic orientation is not impaired by impediment of respiration thus it is not directly coupled to the differences in energy production in different parts of A. proteus body.