The kinetics of the catalysis of Fe(I1) oxidation by crystalline human ferroxidase (ceruloplasmin) has been studied under various conditions at 30’. Two Km values with respect to Fe(U), Km1 = 0.6 /.tM and Km2 = 50 PM, were obtained at pH 6.5, at which ferroxidase gave the maximum activity of 550 Fe(I1) per ferroxidase per min in an acetate buffer. Competition between the two substrates, p-pheny...

A disposable cyclic voltammetry (CV) tag is printed on a plastic film by integrating wireless power transmitter, polarized triangle wave generator, electrochemical cell and signage through a scalable gravure printing method. By proximity of 13.56 MHz RF reader, the printed CV tag generates 320 mHz of triangular sweep wave from +500 mV to -500 mV which enable to scan a printed electrochemical ce...

We report a suitable quinoxaline synthesis using molybdophosphovanadates supported on commercial alumina cylinders as catalysts. These catalysts were prepared by incipient wetness impregnation. The catalytic test was performed under different reaction conditions in order to know the performance of the synthesized catalysts. The method shows high yields of quinoxaline derivatives under heterogen...

The excited-state dynamics of a series of Wurster's salts (p-phenylenediamine radical cations) with different subtituents on the nitrogen atoms was investigated under a variety of experimental conditions using a combination of ultrafast spectroscopic techniques. At room temperature, the lifetime of the lowest excited state of all radical cations is on the order of 200 fs, independently of the s...

Holmberg and Laurell (1948) gave the name " caeruloplasmin " to a blue copper globulin complex which they had isolated from both pig and human blood (1947). It was obtained by ammonium sulphate precipitation and was found to be active as an oxidase against p-phenylenediamine. Tlhey considered it to be an a globulin with a molecular weight of about 150,000. Other workers (Scheinberg and Gitlin, ...

Reaction of [RuVI(N)(L1)(MeOH)]+ (L1 ) N,N′-bis(salicylidene)-o-cyclohexylenediamine dianion) with excess pyridine in CH3CN produces [Ru(L)(py)2] and N2. The proposed mechanism involves initial equilibrium formation of [RuVI(N)(L1)(py)]+, which undergoes rapid N · · · N coupling to produce [(py)(L1)RuIIINtN-RuIII(L1)(py)]2+; this is followed by pyridine substituion to give the final product. Th...