Ratio of 4:1 between ZnGeAs2and MnAs phases in a single composite and its impact on the structure-driven magnetoresistance.

A strong influence of the lattice degree of freedom on magnetoresistance (MR) under high pressure underlies the conception of 'structure-driven' magnetoresistance (SDMR). In most magnetic or topological materials, the suppression of MR with increasing pressure is a general trend, while for some magnetic composites the MR enhances and even shows unusual behavior as a consequence of structural transition. Here we investigated the SDMR in the composite material based on the ZnGeAs2semiconductor matrix and MnAs magnetic inclusions in a phase ratio of 4:1. At ambient pressure, its magnetic and transport properties are governed by MnAs inclusions, i.e. it shows a Curie temperatureTC≈ 320 K and metallic-like conductivity. Under high pressure, the low-field room temperature MR undergoes multiple changes in the pressure range up to 7.2 GPa. The structural transition in the ZnGeAs2matrix has been found at ∼6 GPa, slightly lower than in the pure ZnGeAs2(6.2 GPa). The huge SDMR as high as 85% at 6.8 GPa and 2.5 kOe, which contains both positive and negative MR components, is accompanied by a pressure-induced metallic-like-to-semiconductor-like transition and the enhanced ferromagnetic order of MnAs inclusions. This observation offers a competing mechanism between the robust extrinsic ferromagnetism and high-pressure electronic properties of ZnGeAs2.

[Stomatological help delivery perfection for patients with hematological problems].

Complex examination of dentistry status of the hematologic patients organized in condition of many profile hospitals. From 35 examined light degree of gravity of hemophilia A was revealed in 9 (25,7%) patients, average - in 11 (31,4%), heavy - in 15 (42,9%). Undertaking, complex integrated action within the framework of primary preventive maintenance of oral cavities in patients with hemophilia have allowed for two years to perfect of the dentistry status: reduce average hygienic index on 12,6%, index PMA on 15,5%, intensities of caries on 8,1% in the absence for this period of the development of the complicated forms of caries.

[Determination of gustatory sensitivity thresholds and functional mobility of receptor elements of oral cavity in patients with diabetes mellitus].

Condition of the gustatory perception in diabetes mellitus patients with compensated (51,9%), sub- (39,0%) and decompensated (9,1%) forms of glycolitic disorders was studied. Results allow to note that in the group of patients with decompensated form of the glucose homeostasis disorders reduction of the under investigation factor was more expressing (64,7+/-3,5%), than in the group with compensated (73,6+/-1,9%) and subcompensated (68,6+/-2,2%) forms of diabetes mellitus.

[Cytological study of gum epithelium in connection with diabetes mellitus compensation stage].

The structure of interphased nuclei of gum's epithelium and inflammation of periodontal structure in patients with glycolitic disorders in coonection of degree compensation of diabetes mellitus were studied. In patients with diabetes mellitus and inflammation of gum mucosa 67,33+/-0,05% of gum's cells epithelium had morphology changes nuclei from the date of control group (50,99+/-0,05%) patients. This difference were more essential at deterioration of compensation (62,03+/-0,08%), sub - (67,05+/-0,05%), decompensate (75,11+/-0,07%) diabetes mellitus.