Nanocrystalline SiC film thermistors for cryogenic applications.

We developed a heat-sensitive material based on nanocrystalline SiC films obtained by direct deposition of carbon and silicon ions onto sapphire substrates. These SiC films can be used for resistance thermometers operating in the 2 K-300 K temperature range. Having high heat sensitivity, they are relatively low sensitive to the magnetic field. The designs of the sensors are presented together with a discussion of their thermometric characteristics and sensitivity to magnetic fields.

[The ratio of components of sphingomyelin cycle and lipid composition in patients with viral hepatitis]. / Sootnoshenie komponentov sfingomielinovogo tsikla i sostav lipidov u bol'nykh virusnym gepatitom.

The aim of the study is the investigation of the content of the lipids and the sphingomyelin cycle components in the liver of the patients suffered from viral hepatitis. The methods used were thin layer chromatography for the detection of the lipid pattern and gas liquid chromatography for evaluation of the sphingomyelin fatty acid's and spectrum and ceramides. In the patients suffered from viral hepatitis HCV with moderate activity of the process cholesterin and triglycerides level were less and lysophospholipids content was two-fold and sphingomyelin level was insignificantly higher comparingly than in patients with low activity of the process. In the group of patients suffered from mixt infection (HCV + HBV) there is decreased cholesterin and both phosphatidylcholin and the sphingomyelin content along with lysophospholipids level elevation. In the fatty acid spectrum the palmitate acid (16:0) and the long chain acids (C22-C24) content were higher comparingly with ceramides. Significant difference is observed in oleic acid (18:1) content being as small as 9.3-9.9% in the liver damaged by viral hepatitis.

Activity of phospholipase A2 with different localization in liposomes.

Damages to liposomal membranes resulted from intensification of lipid peroxidation with iron ions in the presence of ascorbate or treatment with the membrane disintegrator tetrachloromethane led to activation of phospholipase A2, which depended on the enzyme localization in liposomes. Activity of phospholipase A2 located on the inner liposome surface increased less significantly compared to the enzyme bound to the outer surface.