When pyrophosphate has been found to influence an enzymatic reaction, its action is usually indirect, that is as a chelator of free essential metal ions rather than directly on the protein catalyst. However, it appears that the latter situation holds for the action of pyrophosphate in the modification of reduced diphosphopyridine nucleotide’ to the product obtained by the action of 3-phosphogly...

A rule use information RUI structure has been proposed to implement non standard connectives and quanti ers that generalize conjunction disjunction implication universal quanti er and existential quan ti er The current implementation of the RUI struc ture in the SNePS Inference Package SNIP main tains a single RUI set for each rule which causes a combinatorial number of substitution compatibili...

In this paper we critically analyze the so far performed and proposed tests for measuring the general relativistic Lense-Thirring effect in the gravitational field of the Earth with some of the existing accurately tracked artificial satellites. The impact of the 2nd generation GRACE-only EIGEN-GRACE02S Earth gravity model and of the 1st CHAMP+GRACE+terrestrial gravity combined EIGEN-CG01C Earth...

Traditionally, modal analysis has been the purview of the expert. However, as the technology has matured, analysis is increasingly being performed by less experienced engineers or technicians. To address this development, software solutions are frequently focusing upon either wizard-based or autonomous/semiautonomous approaches. In this paper, sev eral techniques applicable to either approach a...

Orogenic gold de pos its are char ac ter ized by struc tur ally con trolled, low-sul phide quartz veins that formed prox i mal to deep-crustal faults in greenschist-fa cies meta mor phic ter ranes. These de pos its, pre vi ously re ferred to as mesothermal, greenstone-hosted, shear-hosted and turbidite-hosted de pos its, have a wide range of as so ci ated min er al iza tion styles and as so ci ...