Nanodiamond finding in the hyblean shallow mantle xenoliths.

Most of Earth's diamonds are connected with deep-seated mantle rocks; however, in recent years, μm-sized diamonds have been found in shallower metamorphic rocks, and the process of shallow-seated diamond formation has become a hotly debated topic. Nanodiamonds occur mainly in chondrite meteorites associated with organic matter and water. They can be synthesized in the stability field of graphite from organic compounds under hydrothermal conditions.

[Low-frequency Raman spectra in water and in weak aqueous solutions. Spatial inhomogeneity in hydrogen peroxide solution].

We describe some examples of the study of intermolecular interactions in water and in weak aqueous solutions using the low-frequency Raman spectra. An improved method of determining parameters of the dynamic susceptibility from the Raman spectra is described. The nine spectral parameters (the intensity, the frequency and the width of the two oscillators, the intensity and the width of the relaxation motion and the intensity of fluorescent background) completely describe the spectrum in the frequency range of 4 to 320 cm(-1).

Two phases of the contingent negative variation in humans: association with motor and mental functions.

The question of the relationship between contingent negative variation and the mechanisms controlling motor and mental functions has received inadequate study. The aims of the present work were to investigate the relationship between the early and late phases of contingent negative variation and the state of motor and mental functions in patients with Parkinson's disease and to study the effects of levodopa on contingent negative variation. Patients with Parkinson's disease showed significant decreases in the amplitudes and areas of both phases of contingent negative variation as compared with subjects of similar age.