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119 results on '"Bagratashvili, V.N."'

15. Laser MICROSAMPLING of soil microbial community

Author

Gorlenko, M.V., Chutko, E.A., Churbanova, E.S., Minaev, N.V., Kachesov, K.I., Lysak, L.V., Evlashin, S.A., Cheptsov, V.S., Rybaltovskiy, A.O., Yusupov, V.I., Zhigarkov, V.S., Davydova, G.A., Chichkov, Boris, Bagratashvili, V.N., Gorlenko, M.V., Chutko, E.A., Churbanova, E.S., Minaev, N.V., Kachesov, K.I., Lysak, L.V., Evlashin, S.A., Cheptsov, V.S., Rybaltovskiy, A.O., Yusupov, V.I., Zhigarkov, V.S., Davydova, G.A., Chichkov, Boris, and Bagratashvili, V.N.

Abstract

Standard microorganism isolating technology applied for complex multiphase environmental samples such as soil or sediment needs pre-treatment steps to remove living cells from their mixed-phase microniche, by creating a liquid-phase sample. This process removes synergetic relationships, which help to maintain viability of yet-to-be-cultured and hard-to-culture bacteria. In this paper we demonstrate a high throughput Laser Micro-Sampling (LMS) technology for direct isolation of pure microbial cultures and microbial consortia from soil. This technology is based on laser printing of soil microparticles by focusing near-infrared laser pulses on specially prepared samples of a soil/gel mixture spread onto a gold-coated glass plate. Microsamples of soil are printed on glucose-peptone-yeast agar plates, to estimate the LMS process influence on functional and taxonomic microbial diversity, and on «Eco-log» sole carbon sources microplates, to investigate functional diversity by "metabolic fingerprinting". The obtained results are compared with traditionally treated soil samples. It was shown that LMS treatment leads to increasing of cultured biodiversity and modifies the functional diversity. The strain of rare genus Nonomuraea was isolated by LMS from complex natural environment without using media selective for this genus.

Published
2018

16. PROCEEDINGS OF VOLGA NEUROSCIENCE MEETING 2016 AND VOLGA NEUROSCIENCE SCHOOL 2016 Section BRAIN-COMPUTER INTERFACES, COGNITIVE NAVIGATION WORKSHOP AND NEUROENGINEERING

Author

Tuchina, O., Dominova, I., Klimaviciusa, L., Filiakova, N., Vasilev, A., Patrushev, M., Kasymov, V., Galkina, N.V., Koroleva, М.V., Anisimov, V.N., Luhin, А.О., Iscan, Z., Sokolova, E., Nikulin, V.V., Hramov, A.E., Grubov, V.V., Koronovskii, A.A., Kurovskaya, M.K., Runnova, A.E., Zhuravlev, M.O., Pisarchik, A.N., Lebedev, M.A., Patrushev, M.V., Bogdanov, E.A., Shusharina, N.N., Krilova, N.P., Lobov, S.A., Kastalskiy, I., Makarov, V.A., Shishkin, S.L., Nuzhdin, Y.O., Trofimov, A.G., Svirin, E.P., Fedorova, A.A., Dubynin, I.A., Velichkovsky, B.M., Grigoryan, R.K., Flatov, D.B., Kaplan, A.Y., Wittevrongel, B., Van_Hulle, M.M., Zhigulskaya, D.D., Kirjanov, D.A., Dunin-Barkowski, W.L., Shakirov, V.V., Kazantsev, V.B., Gerasimova, S.A., Mikhaylov, A.N., Korolev, D.S., Belov, A.I., Antonov, I.N., Gorshkov, O.N., Mukhina, I.V., Baliabin, A.V., Tikhobrazova, O.P., Mishchenko, T.A., Schelchkova, N.A., Davidenko, D., Poniatkovskaya, A., Timashev, P.S., Bagratashvili, V.N., Pimashkin, A., Motailo, A., Shamshin, M., and Gordleeva, S.Y.

Subjects
NEUROSCIENCE, NEUROENGINEERING, COGNITIVE NAVIGATION, BRAIN-COMPUTER INTERFACES, VOLGA NEUROSCIENCE MEETING
Published
2016
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19. Long-Term Neurological and Behavioral Results of Biodegradable Scaffold Implantation in Mice Brain

Author

Balyabin, A.V., primary, Tikhobrazova, O.P., additional, Muravyeva, M.S., additional, Klyuev, E.A., additional, Ponyatovskaya, A.V., additional, Shirokova, O.M., additional, Bardakova, K.N., additional, Minaev, N.V., additional, Koroleva, A.V., additional, Mitaeva, Y.I., additional, Mitroshina, E.V., additional, Vedunova, M.V., additional, Rochev, Y.A., additional, Chichkov, B.N., additional, Timashev, P.S., additional, Bagratashvili, V.N., additional, and Mukhina, I.V., additional

Published
2016
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22. Novel Biocompatible Material Based on Solid-State Modified Chitosan for Laser Stereolithography

Author

Timashev, P.S., primary, Bardakova, K.N., additional, Demina, T.S., additional, Pudovkina, G.I., additional, Novikov, M.M., additional, Markov, M.A., additional, Asyutin, D.S., additional, Pimenova, L.F., additional, Svidchenko, E.A., additional, Ermakov, A.M., additional, Selezneva, I.I., additional, Popov, V.K., additional, Konovalov, N.A., additional, Akopova, T.A., additional, Solovieva, A.B., additional, Panchenko, V.Ya., additional, and Bagratashvili, V.N., additional

Published
2015
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23. One photon and two photon process in photo-decomposition of germanium oxygen deficient centres

Author

Dong, L., Bagratashvili, V.N., Tsypina, S.I., Zavorotny, Y.S., Rybaltovskii, A.O., Chernov, P.V., Alimpiev, S.S., and Simanovskii, Y.O.

Abstract

UV photon-induced transformation of germanium oxygen deficient centres (GODC) in germanium-doped silica glass have been studied using photocurrent measurements, absorption and fluorescence bleaching. It has been identified that the photocurrent are generated via a two photon effect. Evidence have been found suggesting that the UV photon-induced destruction of GODCs is achieved via two reaction pathways, a single photon pathway and a two photon pathway. The process is discussed.

Published
1998

24. One photon and two photon process in photo-decomposition of germanium oxygen deficient centres

Author

Dong, L., Bagratashvili, V.N., and Tsypina, S.I.

Abstract

There has been much debate on the fundamental mechanism of photosensitivity in germanium-doped silica optical fibres. The importance of the effect, which was discovered by K.O.Hill in 1978, has been well demonstrated by the still rapidly increasing application areas that it has in fibre optics. Photo-induced index changes as high as ~10 in H2 loaded fibres have enabled very strong gratings to be written conveniently into optical fibres to produce filters, wavelength defining reflectors, dispersion compensators, and sensors. However, the connection between the photosensitivity and the germanium-related oxygen deficient centre (GODC), first proposed by Hand and Russell, is well recognised. Despite uncertainty on the exact microscopic structure of the GODC, the energy levels of the centre is well understood through spectroscopic studies of the centre. A diagram of such an energy level system is depicted in figure 1, with singlet states marked by S and triplet states T. Despite the fact there has been much work been done on the photo-decomposition of GODCs, there is still work to be done for a thorough understanding the process. Potentially there are two possible reaction path ways. One is a direct two photon reaction producing a photoelectron in the conduction band. Most of the photoelectrons will recombine with no net effect and some will be trapped at various sites to create a net change. The second one is a single photon process involving the long lived triplet state and a near by trapping site, probably situated at the next co-ordination sphere. The two situations are shown in figure 1. Here we report an experimental study on the reaction path way of the GODCs, demonstrating that there are both single photon and two photon process existing under different conditions

Published
1997

40. UV laser-induced current in germanosilicate fibres with built in electrodes

Author

Rybaltovskii, A.O., Bagratashvili, V.N., Chernov, P.V., Kazanskii, P.G., Pruneri, V., Tsypina, S.I., and Zavorotnyi, Yu.S.

Abstract

The nature of photocurrents is studied in germanosilicate single-mode fibres with built in electrodes. It is shown that irradiation by excimer KrF laser pulses at electric field strengths up to 1.6 MV cm-1 causes a charge formation and transfer in the core of the fibre and the injection of photoelectrons from metal electrodes to the fibre cladding. Both effects facilitate the flow of electric current through the sample. The dependences of the photocurrent on the electric field strength, the energy density in the laser pulse, the fibre temperature, and the impurity hydrogen in the fibre core are obtained.

Published
2001

41. Macroparticle distribution and chemical composition of laser deposited apatite coatings.

Author

Bagratashvili, V.N. and Antonov, E.N.

Subjects
*APATITE, *LASER ablation, *ANALYTICAL chemistry
Abstract

Examines the effects of macroparticle spatial distribution and chemical composition of apatite coatings subjected to pulse laser ablation. Description of calcium hydroxyapatite; Results of observations from 50 sets of laser-deposition conditions; Analysis of thermal decomposition and evaporation kinetics of apatite coatings.

Published
1995
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