Fragmentation and Multifragmentation of 10.6A GeV Gold Nuclei

We present the results of a study performed on the interactions of 10.6A GeV gold nuclei in nuclear emulsions. In a minimum bias sample of 1311 interac- tions, 5260 helium nuclei and 2622 heavy fragments were observed as Au projec- tile fragments. The experimental data are analyzed with particular emphasis of target separation interactions in emulsions and study of criticalexponents. Multiplicity distributions of the fast-moving projectile fragments are inves- tigated. Charged fragment moments, conditional moments as well as two and three -body asymmetries of the fast moving projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents gamma, beta and tau and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.Comment: latex, revtex, 28 pages, 12 figures, 3tables, submitted to Europysics Journal

Chronology of quaternary volcanic activity in Keli highland (Greater Caucasus) on evidence of K-Ar isotope dating

The specified on the basis of K-Ar data magmatic activity phases in manifestation time coincide with certain activity phases of other large latest-volcanism centers at Greater Caucasus - Elbrus and Kazbek. The initial volcanic activity phase (225-175 thousand years ago) was marked by extrusion bodies formation in different parts of the region. In the Late neo-Pleistocene (130-60 t.y.a.) the activity had reached its maximum, at that stage predominantly lava volcanoes erupted and thus lavatic plateaus and valley streams were formed. The youngest geologic formations in the western part of Keli highland are the volcano Sev. Shadilkhokh and associated with it Hodzh stream; however, strict proof of their Holocene age requires additional data

Chronology of quaternary volcanic activity in Keli highland (Greater Caucasus) on evidence of K-Ar isotope dating

The specified on the basis of K-Ar data magmatic activity phases in manifestation time coincide with certain activity phases of other large latest-volcanism centers at Greater Caucasus - Elbrus and Kazbek. The initial volcanic activity phase (225-175 thousand years ago) was marked by extrusion bodies formation in different parts of the region. In the Late neo-Pleistocene (130-60 t.y.a.) the activity had reached its maximum, at that stage predominantly lava volcanoes erupted and thus lavatic plateaus and valley streams were formed. The youngest geologic formations in the western part of Keli highland are the volcano Sev. Shadilkhokh and associated with it Hodzh stream; however, strict proof of their Holocene age requires additional data

Polymorphism’s assessment of children’s candidate genes associated with low-level long-term exposure to strontium in drinking water

A sequencing of the candidate genes of the pupils, exposed to strontium by the method of targeted resequencing has been performed. It is shown, that under conditions of increased revenues of strontium in drinking water the number of polymorphonuclear altered portions of candidate genes increases. As a result of the targeted resequencing in conditions of strontium exposure, the maximum polymorph modifications of the following genes are defined: sulfotransferase 1A1 (SULT1A1) and methylenetetrahydrofolate. It was shown that the structure of the mutations in conditions of the strontium exposure was characterized by the formation of defects in the gene mapping detoxification (38.5 % of all mutations) and immunoregulation (22.5 %). Analysis of the cause-effect relationships in the system "factor - the number of mutations" revealed that candidate genes reflecting strontium exposure conditions (content of strontium in drinking water is 1.3 MAC), are genes: cytochrome P450, glutathione - transaminase (detoxification); dopamine (CNS), interleukin 17 and the major histocompatibility complex (immune system), methylene-tetra-hydro-folate-reductase (reproduction)