chemical determinations can be performed also under aerobic conditions. 

 The major part of authors, however, report a more intensive reduction under 

 the conditions of anaerobic incubation which can be explained bj^ the competi- 

 tive effect of cytochrome system. 



Table 1. Qualitative changes in siiccinodehydi-ogenase activity in different organs during 

 metamorphosis of the sawfly Cephalcia abietis L. The activity is evaluated according 

 to the reduction degree of triphenyltetrazolium chloride which is manifested by 

 appearing the coloured f ormazan compound. For explanation see text. 



о - по colour appeared; { + ) - little if any colour; -f - faint colour; + + - intense colour; 

 -(- -|- -f - large formazan crystals; — no estimated. 



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