We report the experimental observation of traveling fronts during the electroless deposition of copper on passive steel substrates. The low-carbon steel samples are passivated in nitric acid prior to the plating experiment, thus creating a thin, protective oxide layer on the steel surface. The deposition experiments are carried out from slightly acidic (pH 3.2) copper sulfate solution and coppe...

Three different orientations of non-blue, type 2 cupric complexes on DNA fibers are obtained from EPR data. The cupric complex of bleomycin, CuBlm, binds as described previously (Shields, H., McGlumphy,C., and Hamrick, P., J., Jr. (1982) Biochim. Biophys. Acta 697, 113-120), except possibly with more restricted motion. The square plane of CuBlm makes an angle of about 65 degrees with the fiber ...

The UV absorption method and the thiobarbituric acid (TBA) test for oxidation of an aqueous suspension of linoleate were compared. The absorption method depends on the formation of hydroperoxides having conjugated double bonds that absorb strongly at 233 nm. The absorption at 233 nm increased markedly during oxidation of linoleate catalyzed by either ascorbic acid or cupric ions. The concentrat...

An empirical equation that describes deviations from Michaelian kinetics is proposed. The equation allows the limiting values of the Michaelis constant at v/Vmax --> 0 and v/Vmax --> 1 to be estimated (v is the rate of the enzymatic reaction and Vmax is the limiting value of v at saturating concentrations of substrate). The applicability of the equation is demonstrated for kinetic data obtained...

The oxidative action of copper on different trout Oncorhynchus mykiss erythrocyte components was studied. The results indicate that: --cupric ions differently influence the oxidative status of two trout hemoglobin components I and IV (HbI and HbIV) having different structural and functional properties; --reactive oxygen species (ROS) production associated with hemoglobins autoxidation is not in...

EPR measurements at X- (9.5 GHz), Q- (34 GHz) and W-band (94 on paddlewheel (PW) type post-synthetic metal exchanged DUT-49(M,M): M- Zn, Mn, Cu MOFs are here reported (DUT–Dresden University of Technology). Temperature-dependent X-band recorded from T = 7 K to 170 monometallic DUT-49(Cu), DUT-49(Mn), bimetallic DUT-49(Cu 0.7 Zn 0.3 ), 0.5 Mn ) MOFs. In the case II - dimers in an isotropic excha...

In the course of a comparative study of several methods for the determination of sugar in blood, the results of which will be recorded elsewhere, it became desirable to investigate the reaction betsveen copper sulfate and potassium iodide which is concerned in a number of methods for sugar determination (Bang (l), Maclean (2), Scales (3), Lehmann (4), Riegler (4), Peters (4), Kendall (5)). In c...