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Surface modification of bioresorbable polymer scaffolds by laser treatment / V. V. Slabko [et al.] // Biophysics. - 2010. - Vol. 55, Is. 2. - P234-238, DOI 10.1134/S0006350910020120 . - ISSN 0006-3509
Кл.слова (ненормированные):
hydrophilicity -- laser irradiation -- microbial biocompatible and biodegradable polymers -- polyhydroxybuturate -- surface properties
Аннотация: The effect of laser irradiation on the properties of the surface of films prepared from a bioresorbable polymer poly(hydroxybuturate) has been studied. To determine the spectral region of the polymer optimal for the effective action of radiation on electron molecular bonds, theoretical investigations have been performed, which have shown that, for modifying the surface of PHB scaffolds, it is expedient to use a vacuum laser at a wavelength of 160 nm. Using laser irradiation at a power from 3 to 30 W, a series of films with modified surface, from roughnesses to perforations, have been obtained. The microstructure and properties of the film surface depending on the mode of irradiation have been examined, and conditions have been found under which the contact marginal angles of film wetting with water can be decreased to 50В° (compared with 76-80В° in starting products). Thus, conditions of laser treatment of PHB scaffolds have been theoretically substantiated and experimentally realized that provide a beneficial effect on the properties of the surface without destroying the structure of the material. В© 2010 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Biophysics, Russian Academy of Sciences, Siberian Division, Krasnoyarsk 660036, Russian Federation
Siberian State Technological University, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Slabko, V.V.; Volova, T.G.; Krasnov, P.O.; Kuzubov, A.A.; Shishatskaya, E.I.

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The architectonics of colonies of Bacillus subtilis 2335 [Text] / A. P. Puzyr' [et al.] // Microbiology. - 2002. - Vol. 71, Is. 1. - P. 57-64, DOI 10.1023/A:1017950316748. - Cited References: 12 . - ISSN 0026-2617

РУБ Microbiology

Кл.слова (ненормированные):
electron microscopy -- Bacillus subtills -- spores -- vegetative cells -- glycocalyx -- architectonics of bacterial colonies
Аннотация: Colonies grown from vegetative Bacillus subtilis 2335 cells had a standard structure, with bacillar cells occupying the whole colony volume. At the same time, the colonies of this bacterium grown from germinated spores had an abnormal structure characterized by the location of cells in a surface layer 100-200 mum thick at the colony boundary with the air. The glycocalyx of the colonies grown from spores was characterized by a wetting angle theta(e) of 120degrees-160degrees, whereas that of the colonies grown from vegetative cells had an angle theta(c) as low as 5degrees-30degrees. It is suggested that spores and vegetative cells follow different strategies of substrate colonization and that the architectonics of bacterial colonies is determined by the physicochemical properties of the glycocalyx.

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Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Puzyr', A.P.; Mogil'naya, O.A.; Krylova, T.Y.; Popova, L.Y.

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Surface wettability and energy effects on the biological performance of poly-3-hydroxybutyrate films treated with RF plasma / D. S. Syromotina [et al.] // Mater. Sci. Eng. C. - 2016. - Vol. 62. - P450-457, DOI 10.1016/j.msec.2016.01.075 . - ISSN 0928-4931
Кл.слова (ненормированные):
Plasma -- Polar component -- poly-3-hydroxybutyrate membranes -- Surface energy -- Surface treatment -- Ammonia -- Biodegradable polymers -- Cell adhesion -- Contact angle -- Free energy -- Interfacial energy -- Plasma applications -- Plasmas -- Surface chemistry -- Surface properties -- Surface roughness -- Surface topography -- Wetting -- Biological performance -- Crystalline structure -- Polar components -- Poly-3-hydroxybutyrate -- Surface free energy -- Surface roughness changes -- Surface wettability -- Water contact angle -- Surface treatment
Аннотация: The surface properties of poly-3-hydroxybutyrate (P3HB) membranes were modified using oxygen and an ammonia radio-frequency (RF, 13.56 MHz) plasma. The plasma treatment procedures used in the study only affected the surface properties, including surface topography, without inducing any significant changes in the crystalline structure of the polymer, with the exception being a power level of 250 W. The wettability of the modified P3HB surfaces was significantly increased after the plasma treatment, irrespective of the treatment procedure used. It was revealed that both surface chemistry and surface roughness changes caused by the plasma treatment affected surface wettability. A treatment-induced surface aging effect was observed and resulted in an increase in the water contact angle and a decrease in the surface free energy. However, the difference in the water contact angle between the polymers that had been treated for 4 weeks and the untreated polymer surfaces was still significant. A dependence between cell adhesion and proliferation and the polar component of the surface energy was revealed. The increase in the polar component after the ammonia plasma modification significantly increased cell adhesion and proliferation on biodegradable polymer surfaces compared to the untreated P3HB and the P3HB modified using an oxygen plasma. © 2016 Elsevier B.V.

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Держатели документа:
Department of Experimental Physics, National Research Tomsk Polytechnic University, Tomsk, Russian Federation
Fraunhofer Institute for Interfacial Engineering and Biotechnology, IGB, Stuttgart, Germany
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, 50/50 Akademgorodok, Krasnoyarsk, Russian Federation
School of Fundamental Biology and Biotechnology, Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany
Technical Chemistry II and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany

Доп.точки доступа:
Syromotina, D. S.; Surmenev, R. A.; Surmeneva, M. A.; Boyandin, A. N.; Nikolaeva, E. D.; Prymak, O.; Epple, M.; Ulbricht, M.; Oehr, C.; Volova, T. G.

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Low-temperature argon and ammonia plasma treatment of poly-3-hydroxybutyrate films: Surface topography and chemistry changes affect fibroblast cells in vitro / R. A. Surmenev [et al.] // Eur Polym J. - 2019. - Vol. 112. - P137-145, DOI 10.1016/j.eurpolymj.2018.12.040 . - ISSN 0014-3057
Кл.слова (ненормированные):
Cell adhesion -- Dielectric barrier discharge -- Plasma treatment -- Surface etching -- Wetting behaviour -- Ammonia -- Argon -- Cell adhesion -- Cell culture -- Chemical modification -- Contact angle -- Dielectric materials -- Electric discharges -- Fibroblasts -- Mammals -- Nitrogen plasma -- Plasma applications -- Surface roughness -- Surface treatment -- Temperature -- Topography -- Ammonia plasma treatment -- Dielectric barrier discharges -- Different proportions -- Plasma treatment -- Poly-3-hydroxybutyrate -- Poly3-hydroxybutyrate (PHB) -- Surface etching -- Wetting behaviour -- Wetting
Аннотация: Poly-3-hydroxybutyrate (PHB) films were plasma-treated using pure NH3, pure Ar or mixtures of the two different proportions (20%, 30%, 40%, 50%, 70% NH3 in Ar). Surface chemistry and surface topography changes of PHB films were observed after plasma processing in all plasma regimes. The XPS results confirmed the absence of chemical modification in the case of pure Ar plasma treatment. Nitrogen-containing groups (e.g., N–C[dbnd]O) were detected on the surfaces of P3HB films treated with NH3-containing plasma. The surfaces of the untreated P3HB films were hydrophobic, and plasma treatment turned the surfaces hydrophilic, irrespective of the treatment. A significant decrease in the contact angle and an increase in the free surface energy were observed. An insignificant surface ageing effect was observed when P3HB samples were exposed to air for 10 days. In NIH 3T3 mice fibroblast cells, cell adhesion was significantly improved after plasma treatment in an Ar atmosphere, which is likely related to the fact that there was a surface ? potential of 88.6 mV at neutral pH, causing a cleavage of the polymer chains and an increase in surface roughness. © 2018 Elsevier Ltd

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Держатели документа:
Physical Materials Science and Composite Materials Centre, National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation
Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Stuttgart, 70569, Germany
Synchrotron Radiation Facility ANKA, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/50 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
School of Fundamental Biology and Biotechnology, Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Surmenev, R. A.; Chernozem, R. V.; Syromotina, D. S.; Oehr, C.; Baumbach, T.; Krause, B.; Boyandin, A. N.; Dvoinina, L. M.; Volova, T. G.; Surmeneva, M. A.

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