The crystal structure of potassium magnesium niobium oxide phosphate, KMg(1/3)Nb(2/3)OPO(4), which was described in the space group P4(3)22 [McCarron & Calabrese, (1993 ▶). J. Solid State Chem.102, 354-361], has been redetermined in the revised space group P4(1). Accordingly, the assignment of the space group P4(3)22 and, therefore, localization of K at a single half-occupied position, as noted...

The isotope Sb is known as the lightest ground state proton emitter [1]. In an experiment performed at Berkeley [2], a 478±15 keV proton line was reported and assigned to the the proton emission from the spherical πd5/2 orbital in Sb. As the experimental technique used in this experiment, namely a helium-jet system, did not allow for background suppression, the proton energy spectrum contained ...

Reinvestigation of the Lewis acid catalyzed rearrangement of some open-chain permethyloligosilanes with the Al(Fe)Cl(3) catalyst system exhibited several cases of additional reactivity: namely, a fragmentation/cyclization reaction. Introduction of (trimethylsilyl)methyl substituents into the oligosilane substrates strongly facilitated this reaction, yielding cyclic or bicyclic carbacyclosilanes...

where e = the total enzyme concentration, s = the substrate concentration, t = the time, and K’ = the proteolytic coefficient (3) of the system. Reinvestigation of the above reaction over a greater range of initial substrate concentrations has now shown that the initial reaction velocity at 25’ is essentially independent of the initial substrate concentration for concentrations varying from 0.0...

Ascorbic Acid, Dehydroascorbic Acid, Redox Potential, Free Radical, ESR The previously reported interaction between ascorbate monoanion and dehydroascorbic acid yielding semidehydroascorbic acid has been shown to be thermodynamically unfeasible and non-existent. No evidence for radical for­ mation in the reinvestigation of the reaction using ESR spectroscopy under careful exclusion of air could...