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  • 1
    Electronic Resource
    Electronic Resource
    An order–disorder phase transition in monolayer CO/LiF(001) (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 5653-5656 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monte Carlo simulations of CO physisorbed on a LiF(001) surface show that a monolayer of CO molecules forms an ordered p(2(square root of 2)×(square root of 2))R45 herringbone structure which undergoes an order–disorder phase transition around 30 K. The CO molecules sit near the Li+ sites (C atom down) with a tilt of ∼40° from the surface normal. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475974
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  • 2
    Electronic Resource
    Electronic Resource
    Structures and stability of CO layers on the MgO(001) surface (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 5133-5143 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monte Carlo simulations of CO/MgO(001) show that below 41 K the CO molecules form a c(4×2) structure with six molecules per unit cell distributed into two kinds of adsorption sites: a perpendicular site and a tilted site (polar angle of 31°). Both sites are localized near Mg2+ ions. The occupancy of perpendicular sites to tilted sites occurs in the ratio of 1:2. At 41 K the c(4×2) phase undergoes a phase transition into a less dense, disordered phase accompanied by the expulsion of some molecules to form a partial second layer. The density of the remaining disordered layer is the same as for a p(3×2) phase and portions of the disordered layer show regions of short range ordering with either the c(4×2) or p(3×2) structures. The p(3×2) phase contains four molecules per unit cell and also consists of perpendicular and tilted sites, but in the ratio of 1:1. This structure was found to be stable up to 50 K after which the expulsion of some molecules and disordering of the layer occurred. A model to test the relative stability of these two phases by examining the difference in Gibbs free energy is constructed and shows that below 41 K the c(4×2) phase is the most stable but above 41 K the p(3×2) phase is the most stable. However, at low pressures the model suggests that the p(3×2) phase will not be observed and the layer will instead transform from the c(4×2) phase to a disordered phase at 41 K. This result reconciles the findings of low-energy electron diffraction (LEED) experiments [p(3×2) phase observed] with those of helium atom scattering (HAS) and polarization infrared spectroscopy (PIRS) experiments (disordered phase observed). It is proposed that the c(4×2)→p(3×2) transition is part of an infinite sequence of transitions involving (n×2)-type structures which, under suitable conditions of temperature and pressure, constitutes an example of the devil's staircase phenomenon. Such a phenomenon has been suggested by previous LEED experiments. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481070
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  • 3
    Electronic Resource
    Electronic Resource
    The monolayer and multilayer structure of CO2/NaCl(001) (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2547-2550 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of a Monte Carlo simulation of monolayer and multilayers of CO2 molecules adsorbed on the (001) surface of NaCl at temperature T=55 K are presented. It is found that the monolayer adopts a (2×1) structure; bilayers adopt either a (2×1) or a c(2×2) structure with the latter configuration energetically favored; and trilayers adopt a c(2×2) structure owing to the instability of the (2×1) structure. These results are in accord with recent helium scattering work.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473159
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  • 4
    Electronic Resource
    Electronic Resource
    A simulation of the phase transition in monolayer CO/NaCl(001) (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2551-2554 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a Monte Carlo simulation of the p(2×1)→p(1×1) phase transition in a monolayer of CO molecules adsorbed on a NaCl(001) surface. In the p(2×1) phase the CO molecules are tilted by 24° from the surface normal and have preferred azimuthal orientations whereas in the p(1×1) phase the molecules are oriented perpendicular to the surface with no preferred azimuthal orientation. The transition temperature is estimated to lie in the range 30–35 K. Multiple domains and phase coexistence are also observed.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473349
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of surface-aligned photochemistry (theory). II. Localized H-atom scattering in the HBr(ad)/LiF(001)+hν system (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 9458-9467 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The angular and energy distributions of 1.1 and 2.6 eV H-atom scattering from a LiF(001) surface are compared for two different sources of hot H-atoms (1) localized H-atoms produced by the photolysis of HBr molecules adsorbed on the LiF surface; and (2) H-atoms from a beam at the same energy and angle of approach to the LiF surface as in (1). These distributions are the results of classical stochastic trajectories carried out on a 7×7 slab of LiF(001). The calculated angular distributions are compared with experimental distributions [E. B. D. Bourdon et al., J. Chem. Phys. 95, 1361 (1991)]. The computed effects of changing H-atom energy and surface temperature are also reported; localized scattering becomes increasingly nonspecular at lower photon energies, and broader at higher surface temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463967
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of ranitidine and cimetidine on the pharmacokinetics and pharmacodynamics of metoprolol (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 2 (1988), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The impact of cimetidine, ranitidine and placebo on the pharmacokinetics of metoprolol, given either as a single dose (100 mg) or for 7 days (100 mg b.d.), has been evaluated in two separate studies. The doses used were 800 mg cimetidine daily and 300 mg ranitidine daily. The subjects were all young, healthy volunteers. In the single dose study, cimetidine produced a marked increase in the peak plasma concentration of metoprolol and in the area under the plasma concentration-time curve; ranitidine had less effect, though the area under the curve was significantly greater than placebo. In the chronic dosing study, the area under the curve for metoprolol was also significantly higher on cimetidine (1796 ng h/ml; P 〈 0.001) whereas the area under the curve on ranitidine (1258 ng h/ml) was comparable to that on placebo (1183 ng h/ml). Despite these drug-induced changes in plasma metoprolol concentration, neither cimetidine nor ranitidine altered the change in exercise-induced heart rate during dosing with metoprolol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2036.1988.tb00726.x
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamics of surface-aligned photochemistry (Theory). IV. Hydrogen atom reactions in the hydrogen bromide(ad)/lithium fluoride(001) + h.nu. system (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 12541-12552 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100150a016
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  • 8
    Electronic Resource
    Electronic Resource
    A good read (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 602-602 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - That science is more complex that it was fifty years ago is reflected in the fragmentation of subjects into more and more specialities, each requiring at least one journal of its own to lend an air of respectability. The hard-pressed scientist wishing to keep a tenuous grasp on the broad ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293602d0
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical analysis of polymorphic drug metabolism data using the Rosin Rammler Sperling Weibull distribution (1983)
    Springer
    European journal of clinical pharmacology 25 (1983), S. 443-448 
    Details
    ISSN: 1432-1041
    Keywords: statistical analysis ; pharmacogenetics ; metoprolol ; acebutolol ; isoniazid ; sparteine ; debrisoquine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The Rosin Rammler Sperling Weibull distribution and its use in the analysis of complex data is explained with reference to metoprolol and acebutolol AUC values and isoniazid plasma concentrations. The technique is then applied to sparteine and debrisoquine data to resolve populations into distinct sub-groups. Goodness of fit is measured by applying the X 2 test to the untransformed data. The method is simple to use and sub-groups can be identified rapidly. Each sub-group can be characterised by a simple exponential equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542108
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  • 10
    Electronic Resource
    Electronic Resource
    Variability of plasma drug concentrations: Some observations (1983)
    Springer
    European journal of clinical pharmacology 25 (1983), S. 569-570 
    Details
    ISSN: 1432-1041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542131
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