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U–Pb LA-ICP-MS geochronology of polygenetic zircons from Beshta and Kamenistaya intrusions(the Greater Caucasus)

Acta Geochimica 2022年第6期41卷 1019-1029页

作者： David Shengelia Leonid Shumlyanskyy Giorgi Chichinadze Tamara Tsutsunava Giorgi Beridze irakli javakhishvili Al.Janelidze Institute of Geology of Iv.javakhishvili Tbilisi State University TbilisiGeorgia School of Earth and Planetary Sciences Curtin UniversityPerthAustralia M.P.Semenenko Institute of Geochemistry Mineralogy and Ore FormationKyivUkraine

The Beshta-Kamenistaya intrusions are located in the Main Range structural zone of the Greater *** are composed of tonalitic gneisses that genetically resemble granites of the tholeiitic series of the ophiolitic *** Beshta-Kamenistaya orthogneisses and associated rocks of the nappes differ markedly from those of the Main Range *** of them were overthrust to the Main Range zone during the Bretonian *** age of their protolith and the metamorphism are still not *** the zircon U-Pb LA-ICP-MS dating two age populations of zircons have been distinguished in the rocks of the Beshta-Kamenistaya *** age of the main population of zircons from orthogneisses is 426-300 *** age groups can be distinguished in this *** main group yielded a Concordia age of386.9±1.4 *** are also smaller peaks at 409-405,375-373,and 351 *** oldest ages(426-395 Ma)were detected in the core parts of the complex *** assume that the crystallization of the parental for orthogneisses rocks(tonalities)took place at 410-395 Ma,whereas the Concordia age of 386.9±1.4 Ma and a peak at 375-373 Ma correspond to the metamorphic *** whole metamorphic cycle,including progressive and regressive stages,occurred between 395 and 370 ***,dated in the Beshta-Kamenistaya intrusion at350 Ma and younger,correspond to the Late Variscan *** dated 3102-2769 Ma represent xenocrysts captured by the melts during their formation from the ancient rocks in the crystalline basement.

关键词： The Greater Caucasus Magmatism Metamorphism Orthogneisses U–Pb zircon dating

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Liver structural transformation after partial hepatectomy and repeated partial hepatectomy in rats: A renewed view on liver regeneration

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World Journal of Gastroenterology 2020年第27期26卷 3899-3916页

作者： Keti Tsomaia Leila Patarashvili Nino Karumidze irakli Bebiashvili Elza Azmaipharashvili Irina Modebadze Diana Dzidziguri Marom Sareli Sergey Gusev Dimitri Kordzaia Faculty of Medicine Ivane Javakhishvili Tbilisi State UniversityTbilisi 0159Georgia Faculty of Exact and Natural Sciences Ivane Javakhishvili Tbilisi State UniversityTbilisi 0179Georgia Department of Surgical Oncology(Surgery C) Chaim Sheba Medical Center at HaShomerTel Aviv 52621Israel Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency Moscow 119435Russia Clinical Anatomy and Operative Surgery Ivane Javakhishvili Tbilisi State UniversityTbilisi 0159Georgia

BACKGROUND The phenomenon of liver regeneration after partial hepatectomy(PH)is still a subject of considerable interest due to the increasing frequency of half liver transplantation on the one hand,and on the other hand,new surgical approaches which allow removal of massive space-occupying hepatic tumors,which earlier was considered as ***,the mechanisms of liver regeneration are extensively studied after PH but less attention is paid to the architectonics of the regenerated *** of this,the question“How does the structure of regenerated liver differ from normal,regular liver?”has not been fully answered ***,almost without any attention is left the liver's structural transformation after repeated hepatectomy(of the re-regenereted liver).ATM To compare the architectonics of the lobules and circulatory bed of normal,regenerated and re-regenerated *** The livers of 40 adult,male,albino Wistar rats were studied.14 rats were subjected to PH-the 1st study group(SG1);10 rats underwent repeated PH–the 2nd study group(SG2);16 rats were subjected to sham operation-control group(CG);The livers were studied after 9 months from PH,and after 6 months from repeated ***(Schiff reaction for the determination of DNA concentration),histological(H&E,Masson trichrome,CK8 Immunohistochemical marker,transparent slides after Indian Ink injection,),morphometrical(hepatocytes areas,perimeters and ploidy)and Electron Microscopical(Scanning Electron Microscopy of corrosion casts)methods were *** In the SG1 and SG2,the area of hepatocytes and their perimeter are increased compared to the CG(P<0.05).However,the areas and perimeters of the hepatocytes of the SG1 and SG2 groups reveal a lesser *** regenerated(SG1)and re-regenerated(SG2)livers,the hepatocytes form the remodeled lobules,which size(300-1200μm)exceeds the sizes of the lobules from CG(300-600μm).The remodeled lobules(especially the“mega-lobules”with the

关键词： Partial hepatectomy Repeated hepatectomy Liver regeneration Liver reregeneration Hepatocytes hypertrophy Remodeling Ploidy Corrosion casts

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Thermal and Mechanical Properties of B4C-ZrB2 Ceramic Composite

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材料科学与工程（中英文B版） 2015年第9期5卷 385-393页

作者： Zviad Mestvirishvili irakli Bairamashvili Vakhtang Kvatchadze Nugzar Rekhviashvili 1vane javakhishvili Tbilisi State University ElevterAndronikashvili Institute of Physics. 6 Tamarashvil St. O177 Tbilisi Georgia

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Field and Laboratory Study of Accumulated Debrisflow-Forming Solid Mass Sediment on the Example of River Chokheltkhevi (Mtskheta-Mtianeti Region, Georgia)

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Journal of Geoscience and Environment Protection 2024年第6期12卷 151-160页

作者： Zurab Varazashvili Zurab Kakulia George Gaprindashvili Goga Chakhaia irakli Ramishvili Institute of Hydrogeology and Engineering Geology Georgian Technical University Tbilisi Georgia Faculty of Exact and Natural Sciences Ivane Javakhishvili Tbilisi State University Tbilisi Georgia

The paper presents the results of the field and laboratory research carried out in the Chokheltkhevi river basin, according to which the sediment-forming solid mass accumulated in the bed of the Chokhelthkhevi river was recorded and its granulometric and chemical composition, as well as physical-mechanical characteristics, were studied. Based on the results of the research, it can be said that in the debrisflow channel of the Chokheltkhevi River, coarse and sandy-clay soils are mainly accumulated, which represent an unstable mass for the expected debrisflow in the gorge, which, together with other geological, hydrological and climatic factors, helps to increase the scale of the expected ecological danger. According to the results of the laboratory research, it can be concluded that the soil accumulated in the drainage channel is low in ion concentration, and the humus content in it is minimal, which indicates the possibility of easy displacement of the solid mass accumulated in the drainage channel and, accordingly, the risk of a catastrophic debrisflow.

关键词： Georgia Geology Debrisflow Mudflow Laboratory

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Monitoring of Cadmium Contaminated Soil in Kvemo Kartli Region (Republic of Georgia)

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Open Journal of Geology 2019年第3期9卷 187-192页

作者： Guranda Avkopashvili Marika Avkopashvili irakli Avkopashvili Khvicha Kazaishvi Nikoloz Tsikaridze Green Policy Public and Scientific-Research Platforms Tbilisi Georgia Elephter Andronikashvili Institute of Physics Ivane Javakhishvili Tbilisi State University Tbilisi Georgia Ivane javakhishvili Tbilisi State University Tbilisi Georgia Ilia State University Tbilisi Georgia

Environmental pollution increases from year to year and concentrations of pollutants reach a colossal point, which ultimately affects the health of the living organisms. Industrial pollution and old mining methods are one of the sources of harmful agents in the environment. It is important to study and monitor environmental pollution in dynamics. During several years we have been researching heavy metals distribution in soils in the South East part of Georgia. “RMG Gold and Copper” mine in Kazreti is one of the biggest enterprises in Georgia. As a result of open-cast mining aerosols containing heavy metals are ejected which causes harmful effects of the environment. Within this research 21 villages in Bolnisi and Dmanisi municipalities were investigated;analysis of agricultural soils showed that the concentration of cadmium in the vicinity of the enterprise was significantly increased and exceeded maximum allowed concentrations. Through the wind, cadmium-containing dust spreads out to the 22

关键词： Cadmium Distribution Soil Contamination Gold Mine

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