Induction parameters including inducer concentration, period of induction and the cell concentration at which inducer is to be added to the fermentation broth were optimized in order to increase the yield of the EcoRI restriction endonuclease isolated from recombinant E. coli. Bacterial cells harboring the plasmid pPG430 containing EcoRI endonuclease and the methylase genes under the control of...

This study assessed whether attendance rates in a workplace predicted subsequent outcome of employment-based reinforcement of cocaine abstinence. Unemployed adults in Baltimore methadone programs who used cocaine (N=111) could work in a workplace for 4 hr every weekday and earn $10.00 per hour in vouchers for 26 weeks. During an induction period, participants provided urine samples but could wo...

The effect of water in monomer on the length of the induction period of the polymerization of methyl methacrylate was investigated for varying concentrations of water, catalyst, and inhibitor. For the benzoyl peroxide catalyzed polymerization, the induction period is markedly shortened by small quantities of water in the monomer. It is inversely proportional to the water concentration and direc...

Little is known about the induction period before the nucleation and growth of colloidal semiconductor quantum dots. Here, we introduce an approach that allows us to probe intermediates present in the induction period. We show that this induction period itself exhibits distinct stages with the evolution of the intermediates, first without and then with the formation of covalent bonds between me...

The non-enzymatic oxidation of linoleate occurs with a definite induction period. Bolland has explained the kinetics of the oxidation in terms of a chain reaction involving free radicals (1). The discovery by Privett et al. (2) that the peroxide formed by the action of lipoxidase is optically active clearly rules out the possibility of a non-enzymatic chain sequence, but it is not impossible th...

background and objective: the effect of opioids on the reproductive system has been studied as an attractive research field. in this study, the effect of morphine as an analgesic opioid was evaluated on the ovarian polycystic induction in the rat. materials & methods: in this study, 24 female virgin wistar rats weighing 200-250 g were injected with morphine (1-10 mg/kg/day) for 9 days. cont...

The induction of tryptophan pyrrolase by hydroeortisone has been studied in rats following 70% hepatectomy. An alteration in the rate of induction was observed in both sham-operated and 70% hepatectomized rats early in the postoperative period. Normal maximal values were eventually reached, however. Later in the postoperative period, induction patterns were similar to those observed in unoperat...