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Provider: - Institution: - Data provided by Europeana Collections- Istražen je ucinak djelomicno hidrofobnih molekula (organskog otapala i kvarterne amonijeve soli) na protonom spregnuti prijelaz ...elektrona (PCET) u reakciji askorbata s heksacijanoferat(III) ionom u vodenoj sredini, te je opažen prijelaz iz aktivacijskog režima u režim tuneliranja, dodatkom organskih otapala i kvarternih iona. Eksperimentalna opažanja koja ukljucuju povecane vrijednosti kinetičkog izotopnog učinka (KIE) u odnosu na reakciju u vodi, izotopne omjere AH/AD Arrheniusovih predeksponencijalnih faktora znacajno manje od semiklasično predviđenih, kao i izotopne razlike aktivacijskih energija procesa veće od semiklasičnih, objašnjena su u okviru markusianskog modela tuneliranja koji uzima u obzir dinamičke aspekte sustava i okoliša. Prijelaz protona dinamički je povezan s femtosekundnom dinamikom OH skupine vode. Dodatak djelomično hidrofobnih molekula u vodenu sredinu dovodi do promjena dinamike OH vode zbog interakcije s hidrofobnim dijelom molekule i ta promjena intermolekularnim rezonantnim vibracijskim mehanizmom uključuje molekulu vode u prijelaznoj konfiguraciji i promotivne vibracije povezane s reakcijskom koordinatom protonsko-elektronskog prijelaza u procesu.- The influences of molecular hydrophobic interfaces, involving organic solvents and quarternary ammonium ions, on the proton-coupled electron transfer (PCET) reaction of ascorbate monoanion with hexacyanoferrate(III) ion in water has been investigated. The kinetic isotope effect (KIE) in the reaction and the isotopic differences in Arrhenius activation energies increased and the isotopic ratios of the corresponding pre-factors AH/AD decreased significantly, suggesting a change from the apparent over-the-barrier process in neat water to a tunnelling regime on involving hydrophobic interfaces in the water solvent system. The observed phenomena are ascribed, invoking a Marcus-like tunnelling model that includes dynamical aspects of system and surroundings, to hydrogen tunnelling in reaction dynamically connected with femtosecond motions of water OH, where presence of hydrophobic interfaces causes changes in water dynamics coupled with reaction coordinate of the PCET process through intermolecular vibrational coupling mechanism of water.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Prije sedamdeset godina u Zagrebu je 1922. godine izašla iz tiska prva znanstveno utemeljena knjiga iz stomatologije u Hrvatskoj. To je bila knjiga dr. Eduarda Radoševića pod naslovom »Problemi ...zubarstva u vidu fizikalne kemije«. Dr. Radošević bio je prvi profesor stomatologije na Medicinskom fakultetu Sveučilišta u Zagrebu, izabran 20. siječnja 1922. godine. To je datum kad je utemeljena i prva katedra iz stomatologije u Zagrebu i Hrvatskoj. Prvi šef katedre za odontologiju u Hrvatskoj bio je profesor E. Radošević. Knjiga predstavlja Radoševićev pionirski rad u stomatologiji i sadrži razmatranja o fizikalnim i kemijskim procesima u zubnim tkivima zajedno s autorovim originalnim rezultatima. Radošević je istaknuo značenje znanja iz fiziologije zuba za precizno dijagnosticiranje i liječenje bolesti zuba. Znatan dio publikacije odnosi se na autorove eksperimente o permeabilnosti cakline. Posebno je istaknuta jaka povezanost karijesa i parodontnih bolesti i njihovi zajednički etiološki faktori. Autor je također istaknuo ulogu kemijskih iritacija pulpe kao uzroka nekroze pulpe. Što se tiče preventivnih mjera, Radošević je smatrao da glavni napori za prevenciju karijesa trebaju biti usmjereni i primijenjeni neposredno nakon nicanja zuba. Ta je knjiga prva u stomatologiji u Hrvatskoj koja iznosi suvremena znanja i principe dječje i preventivne stomatologije.
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