Geschwindigkeit der Verdünnung flüssiger Filme

Colloid and Polymer Science - Die Verdünnung eines mit löslichen Tensiden stabilisierten freien flüssigen Filmes wurde mit hydrodynamischen Methoden unter Berücksichtigung der...     

Topochemical investigations of peptide systems

The basic principles of the topochemical approach to the investigation of the structure-function relation in peptide systems are formulated. This approach makes use of the new possibility of transforming natural peptides, consisting in the modification of the molecule as a whole and utilization of the resultant analogs to elucidate the boundaries of the stereoelectronic complementarity of the biologically active peptide to the corresponding receptor. In particular, on the example of depsipeptide antibiotics and their topochemical analogs the fruitfulness of using such compounds as tools in elucidating the physicochemical basis of functioning of biological membranes is shown. The topochemical principle has also been applied in preparing specific competitive inhibitors of proteolytic enzymes, whose study may shed light on the nature of the forces binding the substrate to the contact site of the corresponding enzyme.     

Retention of analgin and anesthesin on sorbents with different polarities: The analysis of bellalgin tablets by high-performance liquid chromatography

The effects of acetonitrile and potassium dihydrogen phosphate concentrations in a mobile phase and the pH of the mobile phase on the retention of analgin (dipyrone) and anesthesin (benzocaine) on Symmetry C18 and Nova-Pak CN HP sorbents with grafted octadecylsilanol and nitrile groups, respectively, were studied. It was found that, under identical conditions, retention on the sorbent with grafted nitrile groups was weaker. A rapid and cost-effective procedure was developed for the determination of analgin and anesthesin in the analysis of Bellalgin tablets.     

Electronic Structure of Ni(II) Acetylacetonate and Its γ-Substituted Analogs

The ab initio Hartree–Fock method with the DZA basis in single- and multideterminant approximations was used to study the electronic structure of nickel bis(acetylacetonate) and its -substituted analogs (X = Cl and CH₃). The character and sequence of canonical molecular orbitals were determined; the influence of -substituents and the role of the correlation and relaxation effects were elucidated.     

Basicities of phosphinylalkylamines in water and ethanol

Conclusions The pK_a values of various phosphinylalkylamines in water and ethanol were determined. The inductive effect of phosphinyl groups on the basicities of the investigated amines was demonstrated. The inductive constants of a series of substituents were estimated.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1265–1267, June, 1982.     

Gas-Sensitive Properties of SnO2-Based Thin Films Obtained from Film-Forming Solutions

Gas-sensitive properties of SnO₂ thin-film materials doped with antimony(III) with respect to the reducing gases CO, CH₄, and H₂ were studied. The materials were obtained from film-forming solutions of Sn(II) and Sb(III) complexes with acetylacetone.