99901
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Lee SS, Oka T. Diode laser spectroscopy of the ν2 fundamental and hot bands of NH+3. J Chem Phys 1991. [DOI: 10.1063/1.459941] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99902
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99903
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Kim SK, Choi YS, Pibel CD, Zheng Q, Moore CB. Determination of the singlet/triplet branching ratio in the photodissociation of ketene. J Chem Phys 1991. [DOI: 10.1063/1.459917] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99904
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Kolodney E, Powers PS, Hodgson L, Reisler H, Wittig C. NO(X 2Π) product state distributions in molecule–surface collision‐induced dissociation: Direct inelastic scattering of n,i‐C3F7NO from MgO(100) at Eincident≤7.0 eV. J Chem Phys 1991. [DOI: 10.1063/1.459905] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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99905
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Barnes LA, Rosi M, Bauschlicher CW. Anab initiostudy of Fe(CO)n,n=1,5, and Cr(CO)6. J Chem Phys 1991. [DOI: 10.1063/1.459924] [Citation(s) in RCA: 129] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99906
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Miers JB, Postlewaite JC, Cowen BR, Roemig GR, Lee IS, Dlott DD. Preexponential‐limited solid state chemistry: Ultrafast rebinding of a heme–ligand complex in a glass or protein matrix. J Chem Phys 1991. [DOI: 10.1063/1.459957] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99907
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Coherent raman spectroscopy of nitrogen molecules and clusters in supersonic jets. ACTA ACUST UNITED AC 1991. [DOI: 10.1007/bf00357660] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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99908
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Angular momentum distributions in a direct photodissociation process of linear triatomic molecules. Chem Phys Lett 1991. [DOI: 10.1016/0009-2614(91)90178-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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99909
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Eimer W, Pecora R. Rotational and translational diffusion of short rodlike molecules in solution: Oligonucleotides. J Chem Phys 1991. [DOI: 10.1063/1.459904] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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99910
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Deutsch HP, Binder K. Interdiffusion and self‐diffusion in polymer mixtures: A Monte Carlo study. J Chem Phys 1991. [DOI: 10.1063/1.459901] [Citation(s) in RCA: 505] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99911
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del Valle F, Tomasi J. Electron correlation and solvation effects. I. Basic formulation and preliminary attempt to include the electron correlation in the quantum mechanical polarizable continuum model so as to study solvation phenomena. Chem Phys 1991. [DOI: 10.1016/0301-0104(91)80124-z] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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99912
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Ershov BG, Mikhailova TL. A study by pulse radiolysis of the radiation-chemical transformation of aqueous solutions of hydrazine in the presence of oxygen. ACTA ACUST UNITED AC 1991. [DOI: 10.1007/bf00965417] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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99913
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Abstract
A detailed model for the structure and dynamics of the interior of the lipid bilayer in the liquid crystal phase is presented. The model includes two classes of motion: (i) the internal dynamics of the chains, determined from Brownian dynamics simulations with a continuous version of the Marcelja mean-field potential, and (ii) noncollective reorientation (axial rotation and wobble) of the entire molecule, introduced by a cone model. The basic unit of the model is a single lipid chain with field parameters adjusted to fit the 2H order parameters and the frequency-dependent 13C NMR T1 relaxation times of dipalmitoyl phosphatidylcholine bilayers. The chain configurations obtained from the trajectory are used to construct a representation of the bilayer. The resulting lipid assembly is consistent with NMR, neutron diffraction, surface area, and density data. It indicates that a high degree of chain disorder and entanglement exists in biological membranes.
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99914
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Vaidyanathan G, Coolbaugh MT, Peifer WR, Garvey JF. Argon mediated electron impact ionization of Arn(CH3OH)m heteroclusters. J Chem Phys 1991. [DOI: 10.1063/1.459959] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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99915
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Pohl M, Schmitt M, Kleinermanns K. Vibrational spectroscopy of size-assigned p-cresol/H2O-clusters in the S0 and S1 state. Chem Phys Lett 1991. [DOI: 10.1016/0009-2614(91)85025-r] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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99916
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Bielski BH, Cabelli DE. Highlights of current research involving superoxide and perhydroxyl radicals in aqueous solutions. Int J Radiat Biol 1991; 59:291-319. [PMID: 1671684 DOI: 10.1080/09553009114550301] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Selected topics of current research on HO2/O2- radical reactions in aqueous solutions are described. The subject is introduced by a brief review of the fundamental background chemistry of HO2/O2-, including a description of the rates and mechanisms of formation and decay as well as their spectral properties, current research on self-exchange rates, etc. This is followed by examples of their reactivity with simple metal complexes of iron, manganese and copper and extended to some biological significant metal-containing systems such as porphyrins, haem enzymes and superoxide dismutases. Some recent results on the interaction of these oxy-radicals with antioxidants, specifically vitamin C and E, are discussed. A brief review of some topical chemistry describing HO2/O2- involvement in atmospheric and aquatic chemistry is given. Finally, some new trends in the areas of heterogeneous catalysis and reactor chemistry that involve these species are described.
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Affiliation(s)
- B H Bielski
- Brookhaven National Laboratory, Upton, New York 11973
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99917
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99918
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Selim ETM, Fahmey MA, Ghonime HS. [C7H7]+ and [C6H5]+ fragment ions produced from methylphenol isomers by electron impact. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/oms.1210260202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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99919
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Hamano K, Kuwahara N, Mitsushima I, Kubota K, Kamura T. Universal exponents for a nonionic micellar solution of tetraethylene glycol decylether in water. J Chem Phys 1991. [DOI: 10.1063/1.460711] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99920
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Böhmer R, Loidl A. Relaxation dynamics in molecular alloys. I. Annealed (C2F6)1−x(CClF3)x mixtures. J Chem Phys 1991. [DOI: 10.1063/1.459885] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99921
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99922
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Sutton GC, Russell NJ, Quinn PJ. The effect of salinity on the phase behaviour of total lipid extracts and binary mixtures of the major phospholipids isolated from a moderately halophilic eubacterium. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1061:235-46. [PMID: 1998695 DOI: 10.1016/0005-2736(91)90289-k] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The effects of molar NaCl concentrations on the phase behaviour of the total lipid extracts and binary mixtures of the major phospholipids, namely phosphatidylethanolamine (PE) and phosphatidylglycerol (PG), isolated from the moderately halophilic eubacterium, Vibrio costicola, grown in 1 M and 3 M NaCl containing media have been studied using X-ray diffraction and freeze-fracture electron microscopy. The effect of both the PE/PG ratio and alterations in fatty acid composition were examined by using binary mixtures which mimicked the PE/PG ratio found in the native bacterial membranes. We show that the samples exhibited complex phase behaviour, including the formation of non-bilayer phases, which depend upon the salinity of both the bacterial culture medium and the suspending solution. The total lipid from bacteria cultured in 1 M NaCl-containing medium and dispersed in 1 M NaCl exhibited a mixture of L alpha and hexagonal-II phases at the optimum growth temperature of the organism (i.e., 30 degrees C), whereas the same lipid dispersed in 3 M NaCl showed only a hexagonal-II phase down to a temperature of +3 degrees C. The total lipid extracted from 3 M NaCl cultures showed only lamellar phases over the temperature range studied (+50 degrees C to -50 degrees C), but the phase transition temperatures of the various lamellar phases were generally higher when the lipid was dispersed in 3 M compared with 1 M NaCl. The phase behaviour of the binary mixtures was similar but not identical to that of the corresponding total lipid extracts and it is suggested that the minor lipid components (diphosphatidylglycerol, lysophosphatidylethanolamine and lysophosphatidylglycerol) play a part in determining the phase behaviour of the native membranes. These results show that the PE/PG ratio and fatty acid composition of the individual phospholipids, which are normally regulated by Vibrio costicola in vivo in response to culture medium salinity, are both important in maintaining a stable bilayer structure within the membrane.
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Affiliation(s)
- G C Sutton
- Department of Biochemistry, University of Wales, Cardiff, U.K
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99923
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Bogey M, Bolvin H, Demuynck C, Destombes JL. Nonclassical double-bridged structure in silicon-containing molecules: Experimental evidence in Si2H2 from its submillimeter-wave spectrum. PHYSICAL REVIEW LETTERS 1991; 66:413-416. [PMID: 10043801 DOI: 10.1103/physrevlett.66.413] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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99924
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Madden PA, O’Sullivan K, Board JA, Fowler PW. Light scattering by alkali halide melts: A computer simulation study. J Chem Phys 1991. [DOI: 10.1063/1.459982] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99925
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Yan YJ, Mukamel S. Pulse shaping and coherent Raman spectroscopy in condensed phases. J Chem Phys 1991. [DOI: 10.1063/1.459938] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99926
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Chen Z, Stratt RM. Liquid theory for band structure in a liquid. III. The mean spherical approximation forpbands and the numerical solution of the mean spherical approximation for bothsandpbands. J Chem Phys 1991. [DOI: 10.1063/1.460001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99927
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Kim HJ, Friedman HL, Raineri FO. Smoluchowski fluctuation theory of dielectric relaxation. J Chem Phys 1991. [DOI: 10.1063/1.460002] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99928
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Rice JK, Baronavski AP. Nonstatistical CO product distributions from the hot H‐atom reaction, H+CO2→OH+CO. J Chem Phys 1991. [DOI: 10.1063/1.460056] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99929
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Oliphant N, Adamowicz L. Multireference coupled‐cluster method using a single‐reference formalism. J Chem Phys 1991. [DOI: 10.1063/1.460031] [Citation(s) in RCA: 270] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99930
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Tsong TT, Chen C. Displacement distributions in diffusion by atomic replacement: Ir atoms on Ir surfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:2007-2017. [PMID: 9997468 DOI: 10.1103/physrevb.43.2007] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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99931
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McBane GC, Kable SH, Houston PL, Schatz GC. Collisional excitation of CO by 2.3 eV H atoms. J Chem Phys 1991. [DOI: 10.1063/1.460020] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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99932
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99933
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Gross P, Neuhauser D, Rabitz H. Optimal control of unimolecular reactions in the collisional regime. J Chem Phys 1991. [DOI: 10.1063/1.460022] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99934
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Schieber JD, Biller P, Petruccione F. A new model for polymer melts and concentrated solutions. J Chem Phys 1991. [DOI: 10.1063/1.460714] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99935
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Kempton JR, Senba M, Arseneau DJ, Gonzalez AC, Garner DM, Pan JJ, Fleming DG, Percival PW, Brodovitch J, Leung S. Hot muonium and muon spur processes in nitrogen and ethane. J Chem Phys 1991. [DOI: 10.1063/1.460061] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99936
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Coalson RD. Obtaining long‐time dynamics in the spectroscopic spin‐boson model via path integration. J Chem Phys 1991. [DOI: 10.1063/1.460016] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99937
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Chantranupong L, Wildman TA. Golden‐rule treatment of hydrogen abstraction by photoexcited acridine guests in fluorene single crystals. J Chem Phys 1991. [DOI: 10.1063/1.460058] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99938
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Pupyshev VI, Panchenko YN, Bock CW, Pongor G. Harmonic force field: An approximate relationship between the exact nonrelativistic and the Hartree–Fock limit values of the force constants. J Chem Phys 1991. [DOI: 10.1063/1.460034] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99939
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Najbar J, Dorfman RC, Fayer MD. Solvent relaxation effects on the kinetics of photoinduced electron transfer reactions. J Chem Phys 1991. [DOI: 10.1063/1.460064] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99940
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Loring RF. Configurational relaxation and diffusion of a flexible polymer in a dynamically disordered medium. J Chem Phys 1991. [DOI: 10.1063/1.460010] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99941
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Lu ZM, Heagy JF, Vallières M, Yuan JM. Quantum dissociation boundary of a kicked Morse oscillator. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:1118-1121. [PMID: 9905132 DOI: 10.1103/physreva.43.1118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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99942
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Kliner DAV, Adelman DE, Zare RN. The H+para‐H2 reaction: Influence of dynamical resonances on H2 (v’=1, j ’=1 and 3) integral cross sections. J Chem Phys 1991. [DOI: 10.1063/1.460063] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99943
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Abstract
Atomic and molecular orbitals are among the tools used by chemists to view the world. The validity of this view for reaction systems can be experimentally probed by examination of the chemistry of electronically excited states and, in particular, by comparison of the reactivities of states having different orbital occupations (electron configurations). Reactivity changes associated with electron configuration are instructive with regard to chemists' views of molecular orbital interactions, but electronic excitation can also influence the course of a chemical reaction by increasing the energy content of the system or by affecting access to different potential energy surfaces by changing spin, orbital symmetry, or spin-orbit level. These various effects are illustrated by studies of gasphase transition metal-mediated H-H and C-H bond-activation processes.
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99944
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Kuipers EW, Vardi A, Danon A, Amirav A. Surface-molecule proton transfer: A demonstration of the Eley-Rideal mechanism. PHYSICAL REVIEW LETTERS 1991; 66:116-119. [PMID: 10043156 DOI: 10.1103/physrevlett.66.116] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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99945
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Abstract
The determination of the structure of proteins and other organic materials by transmission electron microscopy is a rapidly developing field. Obtaining high-resolution images of these radiation-sensitive specimens has, until recently, been problematic. The development of spot-scan imaging, in which the electron beam is focused to a spot with a diameter of about 1000 angstroms and moved over the specimen to record the image, has overcome some of the most severe problems, which result from beam-induced motion of the specimen and its image. Elimination of this motion greatly enhances the contrast of high-resolution features of the image and promises a significant increase in the speed with which future structural work can be accomplished.
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Affiliation(s)
- K H Downing
- Donner Laboratory, Lawrence Berkeley Laboratory, University of California, Berkeley 94720
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99946
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Bai YY, Segal GA, Reisler H. Ab initio calculations of dissociative electronic states of ClCN: Implications to the photodissociation dynamics of the cyanogen halides. J Chem Phys 1991. [DOI: 10.1063/1.460347] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99947
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Rettner CT, Kimman J, Auerbach DJ. Inelastic scattering of NO from Ag(111): Internal state, angle, and velocity resolved measurements. J Chem Phys 1991. [DOI: 10.1063/1.460342] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99948
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Hynes RC, Morton JR, Preston KF, Williams AJ, Evans F, Grossel MC, Sutcliffe LH, Weston SC. Electron paramagnetic resonance study of isolated free radical pairs in M+18-crown-6 TCNQ–. (TCNQ = 7,7′,8,8′-tetracyano-p-quinodimethane; M = K, Rb). ACTA ACUST UNITED AC 1991. [DOI: 10.1039/ft9918702229] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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99949
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Adamowicz L. NNOHCl complex. Ab initio calculations with the coupled cluster method and first-order correlation orbitals. Chem Phys Lett 1991. [DOI: 10.1016/0009-2614(91)90162-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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99950
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Hussein GAM, Sheppard N, Zaki MI, Fahim RB. Infrared spectroscopic studies of the reactions of alcohols over group IVB metal oxide catalysts. Part 3.—Ethanol over TiO2, ZrO2and HfO2, and general conclusions from parts 1 to 3. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/ft9918702661] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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