background: mushroom tyrosinase a potent candidate in clinical studies known as polyphenol oxidase, is a metaloenzyme from the oxidase superfamily widely distributed from lower to higher life forms. it plays a crucial role in sclerotization of exoskeleton in insects, also responsible for skin pigmentation in mammalians. objective: in this study, after reconstitution of mt by some metal ions, th...

this survey is aimed to compare the hierarchical structure of subject directories, including yahoo, the open directory and looksmart with dewey decimal classification (ddc) in 10 selective subjects. five questions are raised to compare the broadness and the depth of the hierarchical structures in the subject directories and ddc and to study the effectiveness of the usage of ddc in the organizat...

the current paper aims to investigate the effect of entrepreneurial marketing on innovation considering the moderating effect of two-factor learning orientation and organizational structure. then, the relationship between innovation and the marketing performance was assessed. in this research, sales and marketing managers of 42 sample companies were selected from three industries including: ind...