Atomic absorption spectroscopy in the v.u.v.-range: determination of bromine

The conditions for the determination of elements by atomic absorption spectroscopy (AAS) in the vacuum-ultraviolet range are discussed. The requirements for the absorption vessel are considered and the equilibrium concentrations of possible dissociation products of different chemical compounds are calculated. In this way it is possible to estimate the detection limit attained with such an AAS arrangement. When losses by diffusion of sample vapour are disregarded a theoretical value of 5 × 10^?10 g Br results. AAS measurements are described using a special graphite oven in conjunction with a vacuum-ultraviolet monochromator. For KBr as a representative substance we obtained the experimental detection limit of 1.5 × 10^?9 g Br with Br I 148.86 nm.     

Oxygen effect in the radiolysis of proteins:: V. Histones

Histones of calf thymus were irradiated with X-rays in different phosphate solutions under nitrogen and air. Degradation of the monomer core histones, formation of aggregates and of fragments were determined by electrophoresis and HPL-gelchromatography. Under nitrogen loss of monomer histones are caused by aggregation, under air by fragmentation. No influence of the different ionic conditions was observed. The G-value for degradation is smaller under air than under nitrogen. These results for histones are compared with the oxygen effect of other proteins.     

N. D. Zelinskii: To the 160th Anniversary of Birth

Russian Journal of Organic Chemistry - February 2021 marked the 160th anniversary of the birth of N.D. Zelinskii, who worked for more than 50 years at Moscow University and headed a large school of...