The regulation of the decay of nitrate reductase. Evidence for the existence of at least two mechanisms of decay.

There seem to be at least two different mechanisms of decay of nitrate reductase in Neurospora in vivo: one which is very sensitive to EDTA and cycloheximide, decreases with mycelial age and is not increased by an increase in temperature from 27 to 37 degrees C, the other which is relatively insensitive to EDTA and cycloheximide, increases with the age of the mycelium and with the above temperature shift.