The E. coli protein WrbA is an FMN-dependent NAD(P)H:quinone oxidoreductase that has been implicated in oxidative defense. Three subunits of the tetrameric enzyme contribute to each of four identical, cavernous active sites that appear to accommodate NAD(P)H or various quinones, but not simultaneously, suggesting an obligate tetramer with a ping-pong mechanism in which NAD departs before oxidiz...

Evidence is presented based on requirements for exchange in the partial reactions, initial velocity and exchange kinetics and product inhibition, that the pyruvate, phosphate dikinase reaction of propionibacteria occurs by a nonclassical Tri Uni Uni Ping Pong mechanism. The mechanism involves a pyrophosphoryl enzyme, a phosphoryl enzyme, and the free enzyme, and three functionally distinct and ...

It has become clear as the result of the pioneering studies of Northrop on transcarboxylase (l), and the later studies in Lardy’s (2) and Utter’s (3) laboratories on pyruvate carboxylase that biotin-containing enzymes have two-site ping-pong mechanisms in which biotin is carboxylated at one site, and in turn carboxylates a substrate at the second site. The rate equations for such mechanisms hav...

Two-body correlations of the isotope-resolved light and heavy clusters are measured in $^{86}$Kr+$^{\rm 208}$Pb reactions at 25 MeV/u. The yield kinetic variables $A=3$ isobars, triton $^3$He, analyzed coincidence with $7\le A \le 14$ emitted earlier chance. While velocity spectra both $^3$He exhibit scaling behavior over type clusters, ratios ${\rm t/^3He}$ correlate reversely to neutron-to-pr...

The crucial issue of quantum communication protocol is its security. A quantum communication scheme must be based on the existing or nearly existing technology, but its security must be guaranteed against an eavesdropper whose technology is limited only by the laws of quantum mechanics. In this paper, we show that all the deterministic and direct two-way quantum communication protocols, sometim...

Introducation. The activities of physical culture and sport subjects are related to the issues popularization certain sports among population. result development game should be seen in quantitative qualitative achievements indicators involvement groups population one or another sport. Aim: establish dynamics basic Ivano-Frankivsk region during 2019−2021. Material methods. Theoretical analysis g...

The unexpected change in user equipment (UE) velocity is recognized as the primary explanation for poor handover quality. In order to resolve this issue, while limiting ping-pong (PP) events we carefully and dynamically optimized handover parameters for each UE unit according to its velocity and the coverage area of the access point (AP). In order to recognize any variations in velocity, we app...