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  • 1
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 44 (1972), S. 2347-2351 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-072X
    Keywords: Streptococcus mutans ; Protonmotive force ; Sugar transport ; Chemostat culture ; Dental disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Streptococcus mutans Ingbritt was grown in glucose-excess continuous culture to repress the glucose phosphoenolpyruvate phosphotransferase system (PTS) and allow investigation of the alternative glucose process using the non-PTS substrate, (3H) 6-deoxyglucose. After correcting for non-specific adsorption to inactivated cells, the radiolabelled glucose analogue was found to be concentrated approximately 4.3-fold intracellularly by bacteria incubated in 100 mM Tris-citrate buffer, pH 7.0. Mercaptoethanol or KCl enhanced 6-deoxyglucose uptake, enabling it to be concentrated internally by at least 8-fold, but NaCl was inhibitory to its transport. Initial uptake was antagonised by glucose but not 2-deoxyglucose. Evidence that 6-deoxyglucose transport was driven by protonmotive force (Δp) was obtained by inhibiting its uptake with the protonophores, 2,4-dinitrophenol, carbonylcyanide m-chlorophenylhydrazine, gramicidin and nigericin, and the electrical potential difference (ΔΨ) dissipator, KSCN. The membrane ATPase inhibitor, N,N1-dicyclohexyl carbodiimide, also reduced 6-deoxyglucose uptake as did 100 mM lactate. In combination, these two inhibitors completely abolished 6-deoxyglucose transport. This suggests that the driving force for 6-deoxyglucose uptake is electrogenic, involving both the transmembrane pH gradient (ΔpH) and ΔΨ. ATP hydrolysis, catalysed by the ATPase, and lactate excretion might be important contributors to ΔpH.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4221-4227 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The laser and phosphor host material with nominal composition LaMgAl11O19 is shown to be nonstoichiometric. Czochralski grown crystals are hexagonal, with space group P63/mmc, and a=5.589 82(5), c=21.9738(12) A(ring) at 295 K. The thermal expansivity has been determined over the range 295 to 860 K: at 295 K, α1=4.97(2)×10−6 K−1 and α3=8.14(3)×10−6 K−1and at 775 K, α1=7.01(1)×10−6 K−1 and α3=10.1(2)×10−6 K−1. The integrated intensities of 20 487 reflections within a reciprocal lattice sphere of radius (sin θ)/λ=1.0 A(ring)−1 were measured on a CAD-4 diffractometer with MoKα radiation, resulting in 18 232 reflections above background. Correction and averaging gave 864 independent structure factors with an internal agreement factor of 0.0145. The crystal structure was solved from the Patterson function and Fourier series and refined by the method of least squares. The final agreement factor R=0.013 98. The composition corresponds to La1−xMgAl11+xO19, with x=0.0502(8): the La deficiency is exactly compensated by excess Al. The principal La site is not fully occupied, but contains 4.76 at. % Al and 5.2 at. % Schottky defects. The remaining 4.94 at. % La and 0.26 at. % Al are distributed over two threefold satellite sites 0.583(3) A(ring) distant from the principal La sites. The Mg atoms share a tetrahedral site equally with Al, while the Al atoms in the trigonal bipyramidal site undergo anharmonic motion. The remaining Al atoms occupy distorted octahedral or trigonal antiprismatic sites, with the latter sharing faces to give an Al–Al distance of 2.6541(9) A(ring). Other polyhedra share only oxygen atom corners or edges. The superior lasing characteristics are due at least partially to the wide separation of 5.5898 A(ring) between principal La sites. The small average atomic radial vibrational amplitude of 0.071 A(ring) corresponds to a Debye characteristic temperature of 631 K.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6012-6020 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Lead tungsten oxyfluoride, Pb5W3O9F10, is a new ferroelectric material that crystallizes in the tetragonal system with space group I4 and four formulas in the unit cell. The lattice constants at 295 K are a=14.583(3) and c=7.365(1) A(ring) for λ(MoKα1,2)=0.709 30, 0.713 59 A(ring). The integrated intensities of all 10 757 reflections within a reciprocal hemisphere of radius (sin θ)/λ ≤0.91 A(ring)−1 were measured on a CAD-4 diffractometer with MoKα radiation and resulted in 7080 F2m ≥2σF2m. Correction for linear anisotropic radiation damage, followed by averaging the symmetry equivalent reflections, gave 2933 independent 〈 F2m〉≥2σ〈 F2m〉 with internal agreement factor Rint〈Fm〉 =0.0289.The crystal structure was solved from the Patterson function and difference Fourier series and refined on w〈 F2m〉 by the method of least squares. The final agreement factors between measurement and model were R=0.0382 and wR=0.0329 on 〈 Fm〉. The as-grown crystal contained equal volumes of ±Z domains. The three independent tungsten atoms form WO6, WO3F3, and WO2F4 octahedra, and the three independent lead atoms form two different PbO4F5 and a PbO4F4 polyhedron. The major local dipole contribution to the spontaneous polarization is associated with a tungsten atom that is displaced 0.172(43) A(ring) from the center of its octahedron. The corresponding predicted Curie temperature is 590(260) K, in agreement with the experimental value of 785(15) K. All six metal atoms undergo anharmonic thermal vibrations, which are fitted either to fifth or sixth order in a Gram–Charlier expansion of the probability density function. The average interatomic distances are W–F=1.798(8) A(ring), W–O=1.944(18) A(ring), Pb–F=2.68(19) A(ring), and Pb–O=2.72(21) A(ring): standard deviations are from Bessel's relationship. The atomic rearrangement required in forming Pb5W3O9F10 from PbF2 and WO3 is discussed, and similarities and contrasts between the related families for which Pb5W3O9F10, SrAlF5, and Sr3(FeF6)2 provide the archetype structures are considered. All three families exhibit ferroelectric behavior.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 265-269 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The variation (often decline) in intensity standards measured during a typical X-ray diffraction structure determination is commonly corrected by means of an isotropic polynomial expression of the form It = I0(1 - Σn Antn), where t is the exposure time in hours, I0 is the integrated intensity at zero exposure and 1 ≤ n ≤ 7. A linear decline corresponding to n = 1 is reported in many studies. In the simplest (linear) anisotropic case, the variation may be represented by It = I0[1 - t(α11h2 + α22k2 + α33l2 + 2α12hk + 2α13hl + 2α23kl)/(h2 + k2 + l2)] where the αij are coefficients of a radiation-damage-effect ellipsoid. Higher-order and exponential time dependences have also been investigated. The results of applying the anisotropy relation both to an organometallic and an inorganic structure, as evaluated by the method of least squares, are presented. For each case the linear anisotropic correction leads to significant reductions in Rint and wRint, with additional improvement resulting from inclusion of quadratic decline correction terms. The smallest number of experimental data required to evaluate the radiation damage anisotropy consists of two sets of symmetry-equivalent reflections.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Banking and Finance 14 (1990), S. 399-421 
    ISSN: 0378-4266
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mechanisms of Development 47 (1994), S. 73-80 
    ISSN: 0925-4773
    Keywords: Mouse ; T-complex ; Tcp-11 ; Testis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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