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  • 1
    Electronic Resource
    Electronic Resource
    Luminescence quantum efficiency and local optical density of states in thin film ruby made by ion implantation (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5142-5147 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystal (0001) oriented, sapphire samples were implanted with 150 keV Cr ions at fluences between 6.0×1014 and 4.0×1015 Cr/cm2. The peak concentrations ranged from 0.04 to 0.28 at %. Characteristic photoluminescence of the R lines at 694.3 and 692.9 nm was observed. Annealing at 1450 °C for 2 h increased the luminescence intensity by a factor of 45, due to the increasing fraction of substitutional Cr ions as confirmed by Rutherford backscattering spectrometry. The Cr luminescence decay rate in an annealed sample implanted with 3.0×1015 at/cm2 at 300 K is 299 s−1. Decay rates were also measured for samples covered with a range of transparent liquids (refractive index n=1.33–1.57), showing a clear increase with increasing refractive index of the liquid. This effect is explained by the increase of the local optical density of states in the Cr-implanted region. By comparing the measured data with the calculated optical density of states the radiative decay rate is found to be 164±10 s−1 and the internal quantum efficiency ∼50%. The quantum efficiency decreases slightly for increasing Cr concentration. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314322
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  • 2
    Electronic Resource
    Electronic Resource
    Low-resistivity epitaxial YBa2Cu3O7 thin films with improved microstructure and reduced microwave losses (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5572-5578 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial thin films of YBa2Cu3O7 have been prepared on SrTiO3 and LaAlO3 substrates by a high-pressure planar dc-sputtering technique. By covering the substrate heater with a frame of polycrystalline YBa2Cu3O7 substantial improvements of the YBa2Cu3O7 film properties were achieved. These are characterized by dc-resistivity values ρ(T) of less than 50 μΩ cm at 100 K and ρ(300 K)/ρ(100 K) values of up to 3.9. Significant deviations from the usual linear ρ(T) behavior were found. Critical temperatures above 90 K, resistive transition widths down to 0.3 K, and critical current densities of about 5 × 106 A/cm2 at 77 K confirm the high quality of the films. As indicated by Rutherford backscattering and high-resolution transmission electron microscopy the films exhibit a microstructure characterized by a reduced density of lattice defects. However, lattice-coherent precipitates with a diameter of about 5–10 nm were observed. As an outstanding feature the films exhibit, besides the initial steep falloff at Tc, a further gradual decrease of the microwave surface resistance at 87 GHz below 50 K by at least one order of magnitude. These results are very promising for millimeter-wave applications of epitaxial YBa2Cu3O7 thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350535
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  • 3
    Electronic Resource
    Electronic Resource
    Adsorption isotherms of water in Li–, Na–, and K–montmorillonite by molecular simulation (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 3322-3329 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A biased Monte Carlo method for the insertion of water in dense clay–water systems is presented. The use of this algorithm results in a considerable increase of the success rate of insertion attempts. It allows us to compute water adsorption isotherms up to high water densities, where the conventional Monte Carlo scheme fails. The isotherms were calculated by a combination of molecular dynamics and grand-canonical Monte Carlo simulation for Li–, Na–, and K–montmorillonite at a fixed d(001) spacing of 12.0 Å. At low water pressure, the degree of clay hydration is governed by the type of counterion, Li–montmorillonite having the highest water content. Hydrogen bonding between water molecules is absent. Li+ and Na+ are small enough to be organized in two layers close to the clay mineral surfaces, whereas K+ is mainly located in the midplane. In both cases, the water molecules primarily reside in the midplane of the interlayer. Increasing the water pressure leads to water adsorption at higher energy sites closer to the surface, i.e., coordinating to the structural OH groups in the hexagonal cavities. A hydrogen bond network is formed in the clay interlayer. This points to water condensation and leads to a sharp increase in the clay water content. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1386436
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  • 4
    Electronic Resource
    Electronic Resource
    Randomized trial of omeprazole and clarithromycin combined with either metronidazole or amoxycillin in patients with metronidazole-resistant or -susceptible Helicobacter pylori strains (1999)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 13 (1999), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: : The impact of metronidazole resistance on the efficacy of proton pump inhibitor based triple therapies remains unclear.〈section xml:id="abs1-2"〉〈title type="main"〉Aim: To study whether metronidazole resistance affects Helicobacter pylori eradication rates in patients treated for 1 week with either omeprazole 20 mg b.d., metronidazole 400 mg b.d. and clarithromycin 250 mg b.d. (OMC), or omeprazole 20 mg b.d., amoxycillin 1000 mg b.d. and clarithromycin 500 mg b.d. (OAC).〈section xml:id="abs1-3"〉〈title type="main"〉Methods: A randomized, single blind, single centre study with parallel groups was conducted. H. pylori positive patients were enrolled in a metronidazole-resistant (MR; MIC 〉 8 μg/mL) or a metronidazole-susceptible group (MS; MIC 〈 4 μg/mL), as determined by E-test. Within the strata patients were randomized to either OAC or OMC.〈section xml:id="abs1-4"〉〈title type="main"〉Results: One hundred and twenty-two patients were included. The per protocol cure rate for OAC was 52 out of 57 (91%) (MS 23 out of 26 (89%); MR 29 out of 31 (94%)) and for OMC 46 out of 55 (84%) (MS 19 out of 22 (86%); MR 27 out of 33 (82%)).〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions: One-week OAC and OMC are effective therapies. OAC and OMC were equally effective in patients with metronidazole-susceptible strains of H. pylori. Using the OMC regimen, neither equality nor significant differences in treatment outcome could be shown between patients with metronidazole-resistant or –susceptible strains of H. pylori.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.1999.00565.x
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  • 5
    Electronic Resource
    Electronic Resource
    A systematic review of Helicobacter pylori eradication therapy—the impact of antimicrobial resistance on eradication rates (1999)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 13 (1999), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: : We systematically reviewed all available data in the literature to determine the overall eradication rates of currently advised Helicobacter pylori eradication regimens and to resolve conflicting evidence on the impact of antimicrobial resistance on the eradication rates.〈section xml:id="abs1-2"〉〈title type="main"〉Methods: A comprehensive search of all published trials on H. pylori eradication therapy was carried out via an electronic database search, hand-searching and checking reference lists of pharmaceutical companies and other reviews. Full papers and abstracts in the English language which study currently advised eradication regimes were included.〈section xml:id="abs1-3"〉〈title type="main"〉Results: 770 study-arms were analysed. Mean eradication rates for bismuth based triple, proton pump inhibitor triple, quadruple and ranitidine bismuth citrate combination therapies vary from 65 to 92%. In case of nitroimidazole resistance, a drop in efficacy of up to 50% was found for bismuth-based triple and proton pump inhibitor-based triple therapies. For quadruple therapy, a significant difference in efficacy was found in the equal-effects analysis; however, this could not be confirmed in the random-effects analysis. In case of clarithromycin resistance, a mean drop in efficacy of 56% was found for one- and two-week clarithromycin containing proton pump inhibitor-triple therapies and of 58% for two-week ranitidine bismuth citrate combined with clarithromycin therapies. For ranitidine bismuth citrate combined with clarithromycin and nitroimidazole, no difference in efficacy was found in case of nitroimidazole or clarithromycin resistance, but data are still scarce.〈section xml:id="abs1-4"〉〈title type="main"〉Conclusions: The cure rate with most regimens dropped significantly, in case of nitroimidazole-resistant strains, compared to nitroimidazole-susceptible strains. In case of clarithromycin resistance, the efficacy of most regimens is also decreased; however, data are still scarce. These data should allow physicians to make a better choice of an appropriate therapy for their patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.1999.00555.x
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  • 6
    Electronic Resource
    Electronic Resource
    Case mix measures and diagnosis-related groups: opportunities and threats for inpatient dermatology (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 19 (2005), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective  The changing healthcare environment world-wide is leading to extensive use of per case payment systems based on diagnosis-related groups (DRG). The aim of this study was to examine the impact of application of different DRG systems used in the German healthcare system.Methods  We retrospectively analysed 2334 clinical data sets of inpatients discharged from an academic dermatological inpatient unit in 2003. Data were regarded as providing high coding quality in compliance with the diagnosis and procedure classifications as well as coding standards. The application of the Australian AR-DRG version 4.1, the German G-DRG version 1.0, and the German G-DRG version 2004 was considered in detail. To evaluate more specific aspects, data were broken down into 11 groups based on the principle diagnosis.Main outcome measure  DRG cost weights and case mix index were used to compare coverage of inpatient dermatological services. Economic impacts were illustrated by case mix volumes and calculation of DRG payments.Results  Case mix index results and the pending prospective revenues vary tremendously from the application of one or another of the DRG systems. The G-DRG version 2004 provides increased levels of case mix index that encourages, in particular, medical dermatology.Conclusions  The AR-DRG version 4.1 and the first German DRG version 1.0 appear to be less suitable to adequately cover inpatient dermatology. The G-DRG version 2004 has been greatly improved, probably due to proceeding calculation standards and DRG adjustments. The future of inpatient dermatology is subject to appropriate depiction of well-established treatment standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-3083.2005.01258.x
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  • 7
    Electronic Resource
    Electronic Resource
    Rhythms of cell proliferation in the hindlimb epidermis of control and thyroxine-treated Rana pipiens tadpoles
    Amsterdam : Elsevier
    General and Comparative Endocrinology 53 (1984), S. 272-280 
    Details
    ISSN: 0016-6480
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0016-6480(84)90253-3
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical studies on the stereochemistry of the coordination compounds SiF"4.2py and SiCl"4.2py
    Amsterdam : Elsevier
    Journal of Inorganic and Nuclear Chemistry 33 (1971), S. 937-945 
    Details
    ISSN: 0022-1902
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-1902(71)80159-8
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  • 9
    Electronic Resource
    Electronic Resource
    Absolutberechnung der kristallstruktur des lithiumhydrids
    Amsterdam : Elsevier
    Journal of Inorganic and Nuclear Chemistry 31 (1969), S. 919-923 
    Details
    ISSN: 0022-1902
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-1902(69)80138-7
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  • 10
    Electronic Resource
    Electronic Resource
    Coordinative interactions in chelated complexes of boron and silicon - VI. Multinuclear magnetic resonance of 1,2,3,4,-tetrahydro-1,10-phenanthroline-boron and -silicon complexes
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 258 (1983), S. 137-146 
    Details
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-328X(00)99250-7
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