Academic literature on the topic 'Kinetic solvent isotope effect'

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Journal articles on the topic "Kinetic solvent isotope effect"

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Away, Kenneth Charles West, and Zhu-Gen Lai. "Solvent effects on SN2 transition state structure. II: The effect of ion pairing on the solvent effect on transition state structure." Canadian Journal of Chemistry 67, no. 2 (1989): 345–49. http://dx.doi.org/10.1139/v89-056.

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Identical secondary α-deuterium kinetic isotope effects (transition state structures) in the SN2 reaction between n-butyl chloride and a free thiophenoxide ion in aprotic and protic solvents confirm the validity of the Solvation Rule for SN2 Reactions. These isotope effects also suggest that hydrogen bonding from the solvent to the developing chloride ion in the SN2 transition state does not have a marked effect on the magnitude of the chlorine (leaving group) kinetic isotope effects. Unlike the free ion reactions, the secondary α-deuterium kinetic isotope effect (transition state structure) f
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Karolczak, Stefan, Hugh A. Gillis, Gerald B. Porter, and David C. Walker. "Solvent-dependent rate constants of muonium atom reactions." Canadian Journal of Chemistry 81, no. 2 (2003): 175–78. http://dx.doi.org/10.1139/v03-009.

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The rates of reaction of muonium atoms with solutes, ionic and organic, were studied in solvents of wildly differing polarities (water, methanol, and hexane) and their rate constants were compared, where possible. In these reactions — which are those of a highly reactive atom, an isotope of hydrogen — it transpires that the reaction rates are higher in solvents in which the solute is more soluble and muonium diffuses faster. This study leads to various kinetic-solvent-effect ratios and to the observation of the reaction of muonium with free radicals being among the fastest reactions recorded s
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Westaway, Kenneth Charles, and Zhu-Gen Lai. "Isotope effects in nucleophilic substitution reactions. VI. The effect of ion pairing on the transition state structure of SN2 reactions." Canadian Journal of Chemistry 66, no. 5 (1988): 1263–71. http://dx.doi.org/10.1139/v88-205.

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Spectroscopic and conductivity studies of sodium thiophenoxide solutions in four different solvents and the secondary α-deuterium kinetic isotope effects found in the presence of 15-crown-5 ether demonstrate that the secondary α-deuterium kinetic isotope effect and transition state structure for the SN2 reaction between sodium thiophenoxide and n-butyl chloride are significantly different, depending on whether the ionic reactant is a solvent-separated ion-pair complex or a free ion. In all three solvents in which the form of the ionic reactant changes, a smaller isotope effect and tighter tran
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Pałka, Katarzyna, Katarzyna Podsadni, Jolanta Szymańska-Majchrzak, and Elżbieta Winnicka. "Deuterium isotope effects in mechanistic studies of biotransformations of l-tyrosine and p-hydroxyphenylpyruvic acid catalyzed by the enzyme l-phenylalanine dehydrogenase." Nukleonika 70, no. 2 (2025): 51–56. https://doi.org/10.2478/nuka-2025-0006.

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Abstract The mechanisms of the reversible oxidative deamination of l-tyrosine to p-hydroxyphenylpyruvic acid and reductive amination of phenylpyruvic acid to l-phenylalanine, both catalyzed by the enzyme l-phenylalanine dehydrogenase (PheDH, EC 1.4.1.20), were investigated using the kinetic isotope effect (KIE) and solvent isotope effect (SIE) methods. The values of deuterium kinetic effects in the 2-position of l-tyrosine and KIE in the (3S)-position of phenylpyruvic acid and solvent isotope effects for both reactions were determined using the non-competitive spectrophotometric method. Some m
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Inaniyan, Yashasvi, Pooja Tak, Pramila Naga, and Priyanka Purohit. "Correlation analysis of reactivity in the oxidation of some vicinal and non-vicinal diols by Tributylammonium chlorochromate: A kinetic and mechanistic approach." Research Journal of Chemistry and Environment 26, no. 9 (2022): 26–32. http://dx.doi.org/10.25303/2609rjce026032.

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The kinetics of oxidation of four vicinal, four non-vicinal diols by tributylammonium chlorochromate (TBACC) has been studied in dimethylsulphoxide (DMSO). The main product of oxidation is the corresponding hydroxycarbonyl compound. The reaction is first order each in TBACC. Michaelies-Menten type of kinetics is observed with respect to the diols. The reaction is catalysed by hydrogen ions. The hydrogen ion dependence is taking the form: kobs = a + b[H+]. The oxidation of [1,1,2,2-2H4] ethanediol exhibits a substantial primary kinetic isotope effect (kH/kD = 5.81 at 298 K). The reaction has be
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Uspenskaya, Elena V., Tatyana V. Pleteneva, Anton V. Syroeshkin, Ilaha V. Kazimova, Tatyana E. Elizarova, and Artem I. Odnovorov. "Role of stable hydrogen isotope variations in water for drug dissolution managing." Current Issues in Pharmacy and Medical Sciences 33, no. 2 (2020): 94–101. http://dx.doi.org/10.2478/cipms-2020-0017.

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AbstractIn the present work, we provide the results of defining by utilizing Laser diffraction spectroscopy, the kinetic isotopic effect of solvent and constant of dissolution rate κ, s−1 of аn active pharmaceutical ingredient (API) in water with a different content of a stable _2^1{\rm{H}} isotope on the basis of the laws of first-order kinetics. This approach is based on the analysis of the light scattering profile that occurs when the particles of the dispersion phase in the aquatic environment are covered with a collimated laser beam. For the first time, the dependence of the rate of disso
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HUANG, Ter-Mei, Hui-Chih HUNG, Tsu-Chung CHANG, and Gu-Gang CHANG. "Solvent kinetic isotope effects of human placental alkaline phosphatase in reverse micelles." Biochemical Journal 330, no. 1 (1998): 267–75. http://dx.doi.org/10.1042/bj3300267.

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Human placental alkaline phosphatase was embedded in a reverse micellar system prepared by dissolving the surfactant sodium bis(2-ethylhexyl) sulphosuccinate (Aerosol-OT) in 2,2,4-trimethylpentane. This microemulsion system provides a convenient instrumental tool to study the possible kinetic properties of the membranous enzyme in an immobilized form. The pL (pH/p2H) dependence of hydrolysis of 4-nitrophenyl phosphate has been examined over a pL range of 8.5-12.5 in both aqueous and reverse micellar systems. Profiles of log V versus pL were Ha-bell shaped in the acidic region but reached a pla
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Seema, Kothari, K. Sharma Pradeep, and K. Banerji Kalyan. "Down the polyhalide path." Journal of Indian Chemical Society Vol. 80, May 2003 (2003): 431–39. https://doi.org/10.5281/zenodo.5839269.

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E-mail : banerjikk@rediffmail.com&nbsp; &nbsp; &nbsp;Fax: 91-291-2742977 <em>Manuscript received 10 October 2002</em> Kinetic and mechanistic studies of oxidation by several quaternary ammonium salts of poly halides, reported from this laboratory, are reviewed. Various kinetic and activation parameters have been reported. The effects of solvent composition, isotopic labeling and isotope composition of solvent have been discussed. Correlation analysis of the reactivity has been emphasized. Suitable mechanisms have been proposed.
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S., Sheik Mansoor, and Syed Shafi S. "Oxidation of formic and oxalic acids by imidazolium fluorochromate in non-aqueous media - A kinetic and mechanistic study." Journal of Indian Chemical Society Vol. 89, Jan 2012 (2012): 69–76. https://doi.org/10.5281/zenodo.5751585.

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Post Graduate and Research Department of Chemistry, C. Abdul Hakeem College, Melvisharam-632 509, Tamil Nadu, India <em>E-mail</em> : smansoors2000@yahoo.co.in Post Graduate and Research Department of Chemistry, Islamiah College, Vaniyambadi-635 752, Tamil Nadu, India <em>Manuscript received 26 August 2010, accepted 10 May 2011</em> Kinetics and mechanism of oxidation of formic and oxalic acids by imidazolium fluorochromate (IFC) have been studied in dimethyl sulphoxide (DMSO). The main product of oxidation is carbon dioxide. The reaction is first order with respect to IFC and organic acids. T
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Armesto, X. L., M. Canle L., V. García, and J. A. Santaballa. "Solvent isotope effects in the oxidation of dipeptides by aqueous chlorine." Canadian Journal of Chemistry 77, no. 5-6 (1999): 997–1004. http://dx.doi.org/10.1139/v99-105.

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A kinetic study of the mechanism of oxidation of Ala-Gly and Pro-Gly by aqueous chlorine has been carried out. Among other experimental facts, the deuterium solvent isotope effects were used to clarify the mechanisms involved. In a first stage, N-chlorination takes place, and then the (N-Cl)-dipeptide decomposes through two possible mechanisms, depending on the acidity of the medium. The initial chlorination step shows a small isotope effect. In alkaline medium, two consecutive processes take place: first, the general base-catalyzed formation of an azomethine (β ca. 0.27), which has an inverse
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Dissertations / Theses on the topic "Kinetic solvent isotope effect"

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Lai, Chung-Jeng. "Fumarate Activation and Kinetic Solvent Isotope Effects as Probes of the NAD-Malic Enzyme Reaction." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc278864/.

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The kinetic mechanism of activation of the NAD-malic enzyme by fumarate and the transition state structure for the oxidation malate for the NAD-malic enzyme reaction have been studied. Fumarate exerts its activating effect by decreasing the off-rate for malate from the E:Mg:malate and E:Mg:NAD:malate complexes. The activation by fumarate results in a decrease in K_imalate and an increase in V/K_malate by about 2-fold, while the maximum velocity remains constant. A discrimination exists between active and activator sites for the binding of dicarboxylic acids. Activation by fumarate is proposed
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Lu, Siran. "Single molecule kinetic isotope effect." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526483.

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Belhadj, Hamza [Verfasser]. "Solvent isotope effect (D2O) in photocatalytic systems / Hamza Belhadj." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1150536683/34.

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Mauve, Caroline. "Production et hydrolyse des amides : mécanismes chimiques, isotopie et applications : étude de la glutamine synthétase." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112397.

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La nutrition azotée des bactéries et des plantes est actuellement un sujet de grande importance, notamment pour comprendre comment améliorer les voies métaboliques aboutissant à l’assimilation de l’azote et à plus grande échelle, optimiser des apports d’engrais et augmenter le rendement des cultures. Dans ce contexte, la réaction d’amidation catalysée par la glutamine synthétase (GS), qui fixe l’ammonium (NH₄)⁺ en glutamine, est cruciale car elle est à la fois le point d’entrée de l’azote dans les végétaux, et une étape-clef du recyclage de l’azote (en particulier, NH₄⁺ photorespiratoire). Dan
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Kopec-Harding, Kamilla Rosa. "Computational studies of the kinetic isotope effect inmethylamine dehydrogenase." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/computational-studies-of-the-kinetic-isotope-effect-inmethylamine-dehydrogenase(b6883173-40ea-4a35-948b-c966105230cd).html.

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There is currently experimental evidence of hydrogen tunnelling in over 20 different enzymes include yeast alcohol dehydrogenase (YADH), morphinone reductase (MR) and methylamine dehydrogenase (MADH). Various models have been used to describe hydrogen tunnelling in enzymes including the static barrier model, the vibrationally enhanced ground state tunnelling model (VEGST) and the environmentally coupled tunnelling model (ECT). Despite some differences in these models, there is a general consensus that a temperature dependent kinetic isotope effect (KIE) is indicative of tunnelling dominated by
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Yidan, Shen. "Solvent Isotope Effect and Hydrogen Bond Effect on The Self-assembly Process of Macroions." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1522256710854143.

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Burke, Erin E. "Heavy atom and hydrogen kinetic isotope effect studies on recombinant, mammalian sialyltransferases." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011586.

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Ingle, Shakti Singh. "RNA structure investigation: a deuterium kinetic isotope effect/hydroxyl radical cleavage experiment." Thesis, Boston University, 2013. https://hdl.handle.net/2144/12787.

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Thesis (Ph.D.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>The hydroxyl radical is widely used as a high-resolution footprinting agent for DNA and RNA. The hydroxyl radical abstracts a hydrogen atom from the sugar- phosphate backbone of a nucleic acid molecule, creatin
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Yousefi-Shivyari, Niloofar. "Isotope ratios in source determination of formaldehyde emissions." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99308.

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Formaldehyde emissions from non-structural wood composites are regulated and the regulation target is urea-formaldehyde (UF) resin. UF resins are hydrolytically unstable and constantly emit formaldehyde as a function of temperature and relative humidity. When heated, wood also generates formaldehyde, but this was of little concern until 2010 when formaldehyde regulations became much more demanding. This regulation motivated the industry to account for all formaldehyde sources, synthetic as from resin, and biogenic as from wood. This effort represents first steps towards quantifying biogenic an
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Kumwimba, Ghislain Mutamba. "Effect of process variables on the kinetic and thermodynamic parameters of platinum solvent extraction by cyanex 921." Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/870.

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Thesis(MTech( Engineering))--Cape Peninsula University of Technology, 2012<br>Platinum is a precious metal which may be processed under acidic conditions. Accordingly, the extraction of platinum from an acidic chloride media is of immense practical importance. In this study, the extraction of platinum was investigated in a Pt(IV)-HCl-Cyanex 921 matrix in order to establish the effect of temperature, extractant concentration, pH and the initial platinum concentration which had been used in the evaluated solvent extraction (SX) process. The extractant phase contained a mixture of Cyanex 921 and
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Books on the topic "Kinetic solvent isotope effect"

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Jiang, Wenyi. Using kinetic isotope effects to determine the effect of ion pairing, substituents and the solvent on the structure of the Sn2 transition state. Laurentian University Press, 1995.

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Quigley, Kim. The use of deuterium kinetic solvent isotope effects and the proton inventory method in the elucidation of the catalyticmechanism of the cysteine protease papain. University of Birmingham, 1987.

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E, Buncel, and Lee C. C. 1924-, eds. Secondary and solvent isotope effects. Elsevier, 1987.

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Wilson, Mathew John. Investigating the possibility of measuring a primary leaving group iodine kinetic isotope effect. Laurentian University, 1999.

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Osborne, Craig. Measuring the rate constant and secondary a-deuterium kinetic isotope effect for the SN2 reaction between para-nitrobenzyl choride and cyanide ion in 15% aqueous DMSO. Laurentian University, 1996.

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Bruce, Cook. The Feasibility of measuring the rate constant and secondary [alpha]-deuterium kinetic isotope effect for the Sn2 reaction between sodium phenoxide and benzyl chloride at low concentrations of phenoxide ion. Laurentian University, 1995.

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Book chapters on the topic "Kinetic solvent isotope effect"

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Leichus, Betty N., and John S. Blanchard. "PIG HEART LIPOAMIDE DEHYDROGENASE: SOLVENT KINETIC ISOTOPE EFFECTS." In Flavins and Flavoproteins 1990, edited by B. Curti, S. Ronchi, and G. Zanetti. De Gruyter, 1991. http://dx.doi.org/10.1515/9783110855425-114.

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Kobayashi, Kensei. "Kinetic Isotope Effect." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_5240.

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Kobayashi, Kensei. "Kinetic Isotope Effect." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_5240.

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Kobayashi, Kensei. "Kinetic Isotope Effect." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_5240-1.

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Scheer, Milton D. "A Kinetic Isotope Effect in the Thermal Dehydration of Cellobiose." In Fundamentals of Thermochemical Biomass Conversion. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4932-4_5.

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Vanoni, M. A., K. K. Wong, and J. S. Blanchard. "Kinetic isotope effect studies on yeast, spinach and human erythrocyte glutathione reductases." In Flavins and Flavoproteins 1987, edited by D. E. Edmondson and D. B. McCormick. De Gruyter, 1987. http://dx.doi.org/10.1515/9783110884715-010.

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Shackelford, Scott A. "Mechanistic Investigations of Condensed Phase Energetic Material Decomposition Processes Using the Kinetic Deuterium Isotope Effect." In Chemistry and Physics of Energetic Materials. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2035-4_18.

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Shackelford, Scott A. "Mechanistic Relationships of the Decomposition Process to Combustion and Explosion Events from Kinetic Deuterium Isotope Effect Investigations." In Chemistry and Physics of Energetic Materials. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2035-4_19.

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Wei, Wen, Min Liu, Lan Chen, W. Phillip Huskey, and Frank Jordan. "Solvent and Carbon Kinetic Isotope Effects on Active-Site and Regulatory-Site Variants of Yeast Pyruvate Decarboxylase." In Thiamine. CRC Press, 2003. http://dx.doi.org/10.1201/9780203913420.ch13.

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Shi, Buchang, and Burtron H. Davis. "The kinetic isotope effect for alkane dehydrocyclization." In 11th International Congress On Catalysis - 40th Anniversary, Proceedings of the 11th ICC. Elsevier, 1996. http://dx.doi.org/10.1016/s0167-2991(96)80326-0.

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Conference papers on the topic "Kinetic solvent isotope effect"

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Takeshita, Yukitoshi, Takashi Miwa, Ethan Becker, Seizo Sakata, Takuya Kamisho, and Takashi Sawada. "Kinetic Water Sorption Behavior of Water-Bone Urethane/Epoxy Coating and Its Effect on Mechanical Strength." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-4018.

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Abstract Conventional coating films are typically solvent based and contain a high percentage of volatile organic compounds (VOCs), which are environmentally damaging and pose health risks to humans. Our developments have been made to the introduction of water-bone low VOC coating systems. Research into the bulk material properties of these low VOC coatings is necessary to understand the degradation process of the coatings. Water sorption behavior of the bulk was focused in this research. We attempt to determine the kinetic of water sorption properties of water-bone urethane/epoxy coating and
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Das, Gaurav, Jerzy Kosinski, Ronald D. Springer, and Andre Anderko. "Scaling Risk Assessment and Remediation in Geothermal Operations Using a Novel Theoretical Approach." In CONFERENCE 2024. AMPP, 2024. https://doi.org/10.5006/c2024-20701.

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Abstract Geothermal power holds immense potential as a renewable energy source with low emissions utilizing the Earth's natural heat to generate electricity. With growing concerns over climate change and the need for sustainable energy alternatives, geothermal power can provide energy independence, economic benefits, and versatility. Mineral scaling has been recognized as a major hindrance in seamless geothermal operations due to the harsh and diverse operating conditions, which can cause significant issues resulting in higher operating costs while reducing energy production's efficiency and o
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Das, Gaurav, Ronald D. Springer, Jerzy Kosinski, and Andre Anderko. "Induction Time Modeling for Common Scaling Minerals in the Absence and Presence of Inhibitors Using a Novel Theoretical Framework." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18805.

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Abstract Mineral scaling in the oil and gas industry poses a significant challenge for flow assurance due to changes in process conditions, such as pressure and temperature changes, dissolved gases, or incompatibility between waters that are mixed in waterflooding process and chemical treatment operations. This study focuses on understanding the scaling threat of common mineral scales (barite, celestine, gypsum, calcite) and on the effectiveness of phosphonate inhibitors at various solution conditions including the concentrations of background electrolytes and temperature. We propose a novel m
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Lobyshev, V. I. "PROSPECTS FOR THE USE OF ISOTOPE-MODIFIED WATER IN BIOLOGY AND MEDICINE." In NOVEL TECHNOLOGIES IN MEDICINE, BIOLOGY, PHARMACOLOGY AND ECOLOGY. Institute of information technology, 2022. http://dx.doi.org/10.47501/978-5-6044060-2-1.87-91.

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The review gives a brief history of the study of biological isotopic effects associated with the replacement of H2O by D2O, explains the quantum nature of kinetic and thermodynamic iso-topic effects of deuterium, as well as isotopic effects of heavy water as a solvent. Some possible medical applications are considered.
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Jarupula, Ramesh, and Surajit Kalal, Maity. "EXCITED STATE DEACTIVATION VIA SOLVENT TO CHROMOPHORE PROTON TRANSFER IN ISOLATED 1:1 MOLECULAR COMPLEX: EXPERIMENTAL VALIDATION BY MEASURING THE ENERGY BARRIER AND KINETIC ISOTOPE EFFECT." In 2023 International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2023. http://dx.doi.org/10.15278/isms.2023.7133.

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Jiang, Clancy Zhijian, Itay Halevy, and Nicholas Tosca. "Kinetic Isotope Effect of C in Siderite Growth at 298.15 K." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1191.

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Mat Don, Mashitah, and Teoh Yi Peng. "Solid-Liquid Extraction of Active Compounds from Schizophyllum commune and Pycnoporus sanguineus: Effect of Solvent Types and Kinetic Study Effect of Solvent and Kinetic study for solid-liquid extraction." In Annual International Conference on Chemistry, Chemical Engineering and Chemical Process. Global Science & Technology Forum (GSTF), 2013. http://dx.doi.org/10.5176/2301-3761_ccecp.08.

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Ober, Douglas, Mitchio Okumura, and TzuLing Chen. "SINGLE SUBSTITUTION KINETIC ISOTOPE EFFECT MEASUREMENTS FOR CH4 + O(1D) USING CAVITY RING-DOWN SPECTROSCOPY." In 2020 International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2020. http://dx.doi.org/10.15278/isms.2020.fb09.

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Kohl, Issaku, Bryan Killingsworth, Edward Young, Nils Kuhlbusch, Max Coleman, and Karen Ziegler. "Sulfate triple-oxygen isotopes from microbially catalyzed pyrite oxidation carry an extreme kinetic isotope effect associated with atmospheric oxygen incorporation." In Goldschmidt 2024. Geochemical Society, 2024. https://doi.org/10.46427/gold2024.24345.

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Jiang, Clancy Zhijian, Itay Halevy та Nicholas Tosca. "Kinetic isotope effect in siderite growth; an abiotic origin for depleted δ13C-siderite in banded iron formations." У Goldschmidt2021. European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.4155.

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