Agar has been used for a number of years in the preparation of elastic duplicating materials. These duplicating materials have been used mainly in partial denture prosthesis for the preparation of a duplicate refectory cast of the original stone cast of the patient's mouth. Since moderately large quantities of duplicating materials are used in these procedures, the low cost and reversibility of...

Riboflavin synthase catalyses a mechanistically complex dismutation affording riboflavin and 5-amino-6-ribitylamino-2,4(1H,3H )-pyrimidinedione from 6,7-dimethyl-8-ribityllumazine. A pentacyclic adduct (compound 2 ) of two substrate molecules was used as substrate for pre-steady-state kinetic analysis. Whereas the wild-type enzyme catalyses the decomposition of compound 2 into a mixture of ribo...

The volume flow through a Nafion membrane originated by the simultaneous action of an electric potential difference and a pressure difference has been measured using aqueous KCl solutions under different experimental conditions. The behavior has been analyzed when both gradients act in the same and in the opposite sense. The results indicate that the simultaneous action of the pressure and pote...

Although many researchers have studied the flow hydraulics in compound channels, there are still many complicated problems in determination of their flow rating curves. Many different methods have been presented for these channels but extending them for all types of compound channels with different geometrical and hydraulic conditions is certainly difficult. In this study, by aid of nearly 400 ...