National Library of Energy BETA

Sample records for oilb gasc ngld


    E-Print Network [OSTI]

    Fox, J.P.


    and inorganic carbon, The solid waste, referred to as spent45 Kg (25 to 100 pounds) of solid waste per barrel of oil,be disposed with other solid wastes in an on-site solid

  2. Short Notes Genetic differentiation in two European tree frog (Hyla arborea)

    E-Print Network [OSTI]

    Alvarez, Nadir

    in contrasted landscapes of western Switzerland Sylvain Dubey1,2, , Sylvain Ursenbacher1,3 , Jérôme Pellet1. In Switzerland, only two sectors in its western part still harbour metapopulations. The first is characterised to southern Sweden, and from the Balkans to west Asia (Gasc et al., 1997). As in several other amphibian

  3. A self-consistent MoD-WM/MM structural refinement method: characterization of hydrogen bonding in the orytricha nova G-1uar

    SciTech Connect (OSTI)

    Batista, Enrique R [Los Alamos National Laboratory; Newcomer, Micharel B [YALE UNIV; Raggin, Christina M [YALE UNIV; Gascon, Jose A [YALE UNIV; Loria, J Patrick [YALE UNIV; Batista, Victor S [YALE UNIV


    This paper generalizes the MoD-QM/MM hybrid method, developed for ab initio computations of protein electrostatic potentials [Gasc6n, l.A.; Leung, S.S.F.; Batista, E.R.; Batista, V.S. J. Chem. Theory Comput. 2006,2, 175-186], as a practical algorithm for structural refinement of extended systems. The computational protocol involves a space-domain decomposition scheme for the formal fragmentation of extended systems into smaller, partially overlapping, molecular domains and the iterative self-consistent energy minimization of the constituent domains by relaxation of their geometry and electronic structure. The method accounts for mutual polarization of the molecular domains, modeled as Quantum-Mechanical (QM) layers embedded in the otherwise classical Molecular-Mechanics (MM) environment according to QM/MM hybrid methods. The method is applied to the description of benchmark models systems that allow for direct comparisons with full QM calculations, and subsequently applied to the structural characterization of the DNA Oxytricha nova Guanine quadruplex (G4). The resulting MoD-QM/MM structural model of the DNA G4 is compared to recently reported highresolution X-ray diffraction and NMR models, and partially validated by direct comparisons between {sup 1}H NMR chemical shifts that are highly sensitive to hydrogen-bonding and stacking interactions and the corresponding theoretical values obtained at the density functional theory DFT QM/MM (BH&H/6-31 G*:Amber) level in conjunction with the gauge independent atomic orbital (GIAO) method for the ab initio self consistent-field (SCF) calculation of NMR chemical shifts.