  In the framework of a field theoretic model obtained by second quantization
of Doi-type master equation, we investigate the effects of random sources and
sinks on the reaction kinetics in the master-equation description. We show that
random sources and sinks significantly affect the asymptotic behavior of the
model and identify two universality classes when describing them using scaling
analysis. We compare the results with the Langevin-equation description of the
same process.
