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Showing 1 to 20 of 69 for “"isotope effects"”.

  1. Thermochemical hydrogen-deuterium isotope effects

    Duer, Wayne C.University of Missouri--Rolla2016

    … deuterium containing compounds to yield isotope effects on heats of solution. These isotope effects were interpreted in terms of hydrogen bonding and an empirical equation for the prediction of enthalpies of formation of hydrogen bonds. It was concluded that for a given isotopic pair the …

    must-thes Repository record

  2. Carbon Isotope Effects: Malonic Acid Decarboxylation

    Ikeda, Richard MasayoshiUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-05T19:37:01Z (GMT). No. of bitstreams: 1 5900526.pdf: 3674148 bytes, checksum: 7b4988e9c0a6f505ce9e8dd72b26b4bd (MD5) Previous issue date: 1958

    uiuc Repository record

  3. Relative Isotope Effects of Carbon-13 and Carbon-14

    Promislow, Albert LouisUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-05T19:36:09Z (GMT). No. of bitstreams: 1 0011527.pdf: 5248951 bytes, checksum: 448c0e5136cd3c69f179ebfe3ef8c2e6 (MD5) Previous issue date: 1955

    uiuc Repository record

  4. Theoretical and Experimental Studies of Some Carbon Kinetic Isotope Effects

    Huang, Thomas Tao-ShingUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-09T17:36:21Z (GMT). No. of bitstreams: 1 6915320.pdf: 4521250 bytes, checksum: 6bf79633e81a9e9be322b5154ac7fe79 (MD5) Previous issue date: 1969

    uiuc Repository record

  5. Carbon Isotope Effects in the Decarboxylation of Malonic Acid Vapor

    Gatz, Carole RuthUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-05T19:37:22Z (GMT). No. of bitstreams: 1 6001646.pdf: 3487741 bytes, checksum: bc4ce7161774b52e90b76ebaacd3b38f (MD5) Previous issue date: 1960

    uiuc Repository record

  6. Barrier Curvature and Medium Interaction Effects on Carbon-13 Kinetic Isotope Effects

    Keller, Joseph HerbertUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-10T23:01:53Z (GMT). No. of bitstreams: 1 7414565.pdf: 4358330 bytes, checksum: cccea4c400ff7e41c4595092a682c6d1 (MD5) Previous issue date: 1974

    uiuc Repository record

  7. Kinetics and Isotope Effects of the Thermal Decomposition of Some Solid Metal Oxalates

    Zavitsanos, Petros DemetriosUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-05T19:37:26Z (GMT). No. of bitstreams: 1 6001703.pdf: 3774363 bytes, checksum: 414cb500db84d4aff1575bcd647f8634 (MD5) Previous issue date: 1960

    uiuc Repository record

  8. Carbon Isotope Effects in Malonic Acid Decarboxylation. I. Influence of Perdeuteration. Ii. The Ionization Effect

    Koch, William GeorgeUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-09T17:34:48Z (GMT). No. of bitstreams: 1 6406093.pdf: 7747900 bytes, checksum: e5faf38c5cf92af6b31842662693a576 (MD5) Previous issue date: 1963

    uiuc Repository record

  9. The impact of metals and other stress factors on microbial ammonia oxidation physiology and isotope effects

    Martocello, Donald E., IIIMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2024

    … Central to these studies were analyses of stable isotope fractionation and how changes in AOO physiology impact expression of these isotope effects. In turn, these tools facilitate probing of the ammonia oxidation reaction mechanism and we propose an initial obligatory coordinated NH4+-NH3 uptake …

    woods-hole Repository record

  10. Deuterium isotope effects on in vitro dealkylation of 1,1-dimethylhydrazine and 1,1-dimethylnitrosamine via hepatic enzymes

    Sloane, Robert

    rit Repository record

  11. Enzymic Oxidations of Ent-Kaurene and Ent-Kaurenol in Gibberellic Acid Biosynthesis: Stereochemistry and Isotope Effects

    Sherwin, Paul FrederickUniversity of Illinois at Urbana-Champaign2014

    … acid. The stereochemistry and deuterium isotope effects (k(,H)/k(,D)) of these two oxidations were studied using stereospecifically labelled derivatives of 1 and 2 and microsomal enzyme extracts of Marah macrocarpus (wild cucumber) as the MFO source.

    uiuc Repository record

  12. Secondary deuterium isotope effects in the solvolysis of propionyl-D₀, -2, 2-D₂ and -3,3,3-D₃ chlorides

    Kang, Uan Gen, 1938-1969

    Thesis (M.S.)--Michigan State University. Dept. of Chemistry, 1969

    msu Repository record

  13. Reactions of energetic carbon atoms produced by ¹²C(p,pn)¹¹C in alkanes and alkyl chlorides: moderator effects and deuterium isotope effects

    Taylor, Kathleen Karen CarrollVirginia Tech1974

    The reactions of energetic carbon atoms produced by the nuclear reaction ¹²C(p,pn)¹¹C in some specifically-deuterated ethanes and propanes were investigated.

    vt Repository record

  14. Stereochemistry, isotope effects, and inhibition of terpene biosynthesis: I. Stereospecificity and mechanism of monoterpene cyclases. II. Inhibition by heteroatom analogs of carbocation intermediates

    Pyun, Hyung-JungUniversity of Illinois at Urbana-Champaign2011

    … deprotonate non-regiospecifically. Deuterium isotope effects on the monoterpene product distribution from incubations of (1-$\sp3$H;8,9-$\sp2$H$\sb6$) GPP with the pinene cyclases are too small to explain by isotopically sensitive branching between limonene and the bicyclic monoterpenes.

    uiuc Repository record

  15. 1. The Endocyclic Restriction Test: Oxygen Transfer From N-Sulfonyl Oxaziridines to Alkenes and Fluorine From N-Fluorosultams to Carbanions. 2. Intra- and Intermolecular Kinetic Isotope Effects in Directed Lithiations

    Anderson, David R.University of Illinois at Urbana-Champaign2015

    … by measuring intra- and intermolecular kinetic isotope effects. The results were more in line with a two-step mechanism where an organolithium base coordinates to the heteroatom of the directing group prior to the deprotonation step. These experiments underscore the inability of this method to …

    uiuc Repository record

  16. A study of the kinetic and thermodynamic properties of carbon acids in methanol

    Filger, Dennis L.University of Missouri--Rolla2016

    … temperatures.</p> <p>The hydrogen-deuterium isotope effects for the reaction of chloroform, iodoform or 9-phenylfluorene with methoxide were determined in methanol at various temperatures. These isotope effects were found to be small for chloroform and iodoform (1.25 and 1.02 at 0°C, …

    must-thes Repository record

  17. Orientation and chemistry of alkoxides on copper(111)

    Street, Shane ClarkUniversity of Illinois at Urbana-Champaign2011

    … as aldehydes. The influence of deuterium isotope labelling, selective fluorination, and chain length on this mechanism has been studied. Temperature Programmed Reaction (TPR) spectra for the reactions of ethoxides and 1-propoxides and their selectively deuterated counterparts reveal both …

    uiuc Repository record

  18. Investigating Controls on Variation in Isotopic Fractionation during Biodegradation of Chlorinated Ethenes and Ethanes

    Douglas, Lisa Marie2015

    Kinetic isotope effects occur due to different reaction rates for light and heavy isotope-containing molecules, and are controlled by the bonds broken during degradation. For many primary pollutants, stable carbon, hydrogen, and chlorine isotope effects have been found to fit a Rayleigh model, …

    toronto-retro Repository record

  19. The oxidation of secondary alcohols by dipotassium tetraoxoferrate (VI) In concentrated and dilute potassium hydroxide solutions

    Lewis, William C.

    … intermediate, other than iron-VI. Deuterium isotope effects show that the breaking of the C-1! bond on the alpha-carbon is the rate determining step for the oxidation. The isotope effects also indicate, by applying the Swain Criteria, that a hydride mechanism is likely. The salt effect, …

    binghamton Repository record

  20. The Dynamics of Dehydrogenases - A Phase Space Odyssey

    Varga, Matthew J.The University of Arizona.2017

    … present a method for the calculation of kinetic isotope effects from first principles, using transition path sampling and centroid molecular dynamics. This method allows for the calculation of kinetic isotope effects without the assumptions necessitated by transition state theory or free energy …

    arizona-thes Repository record

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