We investigated the adsorption of hexylamine (in its hydrated form, hexylammonium ion) on the solution-platinum interface in 1 M HClO4 in the presence of 0.1 M Fe2+ and 0.1 Fe3+ by potentiodynamic and impedance methods, and also at the solution-air interface by the maximum bubble pressure technique. We show that the physical adsorption of hexylamine at both interfaces is described by the Dhar-Flory-Huggins isotherm equation. The values of adsorption constant and free adsorption energy are close for both interfaces. For the solution-air interface, the hydrophobic effect is the main reason for the surfactant adsorption at this interface. Based on the closeness of the main adsorption characteristics for both interfaces, we suggest that the adsorption of hexylamine on platinum occurs mainly due to the hydrophobic interaction of hexylamine polar molecules with water polar molecules as well. It has been shown that for the solution–platinum interface, the share of the hydrophobic effect is about 60%, and that of the van der Waals interaction is about 40%.

Satellite radar (SAR) and visible band data from Envisat ASAR, ERS-2 SAR, Lansat-5,7,8 sensors were used to investigate internal waves (IWs) in the Black Sea. The three main areas of the Black Sea where surface manifestations of internal waves (SMIWs) were mostly observed are: the Danube Delta, Crimea Peninsula and the northeastern region near Novorossiysk. The main goal of our investigation was to define the mechanisms of IW generation in the non-tidal sea. In the first area, IWs are observed rather often due to surface intrusions of fresh waters of the Danube River. In contrast to usual soliton-like IW trains caused by river plumes, soliton trains near the Danuba Delta propagate in different directions and often subject to nonlinear interactions. The interrelation between location and orientation of IW trains and fresh water fronts is discussed. In the area off Crimea, in our opinion, IWs are generated mainly by upwelling relaxation and interaction between internal inertial waves and bottom topography features. SMIW in the northeastern part of the Black Sea are scarce, though IWs are regularly revealed by in-situ measurements.Field measurements were conducted in the northeastern part of the Black Sea from a small boat and from scientific sea platform near Crimea employing CTD probes, thermistor chain and Acoustic Doppler Current Profilers (ADCP). ADCP measurements allowed us to detect a number of IW trains. Their amplitudes were estimated to reach 5-8 m. Joint analysis of satellite SAR and subsatellite data gave an assessment of their typical wavelength at 90-100 m.

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Резюме. Российская лабораторная сеть (РЛС) по надзору за корью и краснухой в своей работе использует модифицированный алгоритм лабораторного подтверждения случаев кори независимо от первичного диагноза. Алгоритм включает в себя, наравне с тестами по выявлению IgM-и IgG-антител, тест по определению степени авидности IgG. Результаты, полученные при обследовании лиц с подозрением на коревую инфекцию (637 человек), а также больных с пятнисто-папулезной сыпью и лихорадкой (423 человек) показали, что целесообразность введения данного теста может быть использована в следующих случаях: а) при наличии одного образца сыворотки; б) при несоблюдении интервала между парными сыворотками; в) при отсутствии диагностического нарастания IgG-антител; г) для определения типа иммунного (первичного, вторичного) ответа и д) для исключения «ложноположительных» результатов по антителам класса М. Кроме того, в работе представлены данные о вовлечении в эпидемический процесс по кори не только не привитых (79,7%), но и лиц, получивших ранее 1 или 2 дозы коревой вакцины (20,3%).

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