melanin pigment plays a critical role in camouflage and   protection against harmful effects of solar radiation. melanogenesis is under   complex regulatory control by multiple agents. tyrosinase is a   multifunctional, which catalyzes the first two steps in mammalian   melanogenesis. in this study, inhibitory effects of astragalus fasciculifolius   and astragalus gypsicolus on diphenolase acti...

An approach is described for the simultaneous measurement of catalysis, the distance from an active-site moiety to fluorescent substrate moieties of an enzyme substrate complex, and the microenvironment of such substrate groups. It is illustrated by means of a three-component energy transfer relay system, consisting of cobalt carboxypeptidase, its fluorescent dansylated peptide substrates, and ...