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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 364-369 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical properties of the ZnSe/GaAs heterostructure have been investigated using the acoustoelectric voltage spectroscopy technique, and in particular, the role of the high-resistivity ZnSe on the surface passivation of the GaAs substrate has been evaluated. From the transverse acoustoelectric voltage (TAV) spectra, the carrier type and concentration, energy band offsets, and the energy levels of various trap states at the heterostructure interface have been found. The effect of heterostructure epitaxial layer on the surface properties of GaAs has been studied by comparing the normalized changes in TAV amplitude for samples of various epitaxial layers and different thicknesses. From all these measurements, surface recombination velocities (S) have been evaluated. For the pseudomorphic ZnSe films (thickness ≤0.15 μm) on GaAs, a reduction in S has been found. As the thickness of the ZnSe film was increased, the presence of a large number of interface states due to the introduction of misfit dislocations was detected using TAV measurements.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 15 (2001), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A mycobacterial infection may be the cause of Crohn’s disease in some patients. Measurement of intestinal permeability may identify Crohn’s disease patients with a high likelihood of relapse and may quantify the severity of intestinal injury.〈section xml:id="abs1-2"〉〈title type="main"〉Aim:To assess the effect of 3 months of clarithromycin and ethambutol on the disease activity and intestinal permeability in patients with Crohn’s disease at high risk of relapse.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:Patients with Crohn’s disease, with a lactulose–mannitol permeability test above 0.03, were randomly assigned to receive either clarithromycin, 500 mg twice daily, and ethambutol, 15 mg/kg daily, or identically appearing placebo for 3 months in addition to their regular therapy. The Harvey–Bradshaw index and the lactulose–mannitol test were assessed in a blind fashion every 3 months for 12 months.〈section xml:id="abs1-4"〉〈title type="main"〉Results:Thirty-one patients were randomized to receive either drugs (n=15) or placebo (n=16). The groups were similar in age, sex, duration of disease, location of disease, past complications and disease severity. Specifically, there was no difference between the drug or placebo groups in the mean Harvey–Bradshaw index (4.8 vs. 4.4), number with active disease (33% vs. 44%) and mean lactulose–mannitol test (0.06 vs. 0.10). During the 12-month follow-up period, there were no consistent, statistically significant differences in the mean Harvey–Bradshaw index or lactulose–mannitol test between treatment and placebo groups. Individual patients showed either improvement or worsening of these indices, but these were not related to study medication. Specifically, no ‘cures’ were noted with anti-mycobacterial treatment.〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions:Three months of treatment with clarithromycin and ethambutol does not benefit Crohn’s disease patients who are receiving standard medical therapy.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Crystal Growth 138 (1994), S. 127-130 
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Crystal Growth 124 (1992), S. 628-632 
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Crystal Growth 138 (1994), S. 105-109 
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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