
Chloranil 
Studies showed that exposure of chloranil to ultra violet light 
resulted in a two step reduction (1547). When chloranil was added to 
cultures of Aspergillus niger, Neurospora crassa, or Mucor sp., a rapid 
buildup of free radicals was observed by electron spin resonance 
spectroscopy. Yeast suspensions and extracts also exhibit a rapid build- 
up and decay of a free radical. This corresponded to the semiquinone (1617). 
Chlorate 
The toxicity of chlorate to wheat plants appeared to be coupled 
to a nitrate reductase system and to be caused by C105 that resulted 
from reduction of C103 by this system (874). 
