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Sökning: WFRF:(Parac M.)

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1.
  • Gutman, I., et al. (författare)
  • Estimating and approximating the total pi-electron energy of benzenoid hydrocarbons
  • 2000
  • Ingår i: Zeitschrift fur Naturforschung A-A Journal of Physical Sciences. - 0932-0784 .- 1865-7109. ; 55:5, s. 507-512
  • Tidskriftsartikel (refereegranskat)abstract
    • Lower and upper bounds as well as approximate formulas for the total pi-electron energy (E) of benzenoid hydrocarbons are deduced, depending only on the number of carbon atoms (n) and number of carbon-carbon bonds (m). These are better than the several previously known (n, m)-type estimates and approximations for E.
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2.
  • Jayasinghe-Arachchige, Vindi M., et al. (författare)
  • Hydrolysis of Chemically Distinct Sites of Human Serum Albumin by Polyoxometalate : A Hybrid QM/MM (ONIOM) Study
  • 2019
  • Ingår i: Journal of Computational Chemistry. - : Wiley. - 0192-8651 .- 1096-987X. ; 40:1, s. 51-61
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, mechanisms of hydrolysis of all four chemically diverse cleavage sites of human serum albumin (HSA) by [Zr(OH) (PW11O39)](4-)(ZrK) have been investigated using the hybrid two-layer QM/MM (ONIOM) method. These reactions have been proposed to occur through the following two mechanisms: internal attack (IA) and water assisted (WA). In both mechanisms, the cleavage of the peptide bond in the Cys392-Glu393 site of HSA is predicted to occur in the rate-limiting step of the mechanism. With the barrier of 27.5 kcal/mol for the hydrolysis of this site, the IA mechanism is found to be energetically more favorable than the WA mechanism (barrier = 31.6 kcal/mol). The energetics for the IA mechanism are in line with the experimentally measured values for the cleavage of a wide range of dipeptides. These calculations also suggest an energetic preference (Cys392-Glu393, Ala257-Asp258, Lys313-Asp314, and Arg114-Leu115) for the hydrolysis of all four sites of HSA. (C) 2018 Wiley Periodicals, Inc.
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