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  • 2005-2009  (2)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 131-133 (Oct. 2007), p. 553-558 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The effect of phonon confinement and impurity doping in silicon nanowires (SiNWs)synthesized by laser ablation were investigated. The diameter of SiNWs was controlled by thesynthesis parameters during laser ablation and the subsequent thermal oxidation. Thermal oxidationincreases the thickness of the SiNWs’ surface oxide layer, resulting in a decrease in their crystallineSi core diameter. This effect causes a downshift and asymmetric broadening of the Si optical phononpeak due to phonon confinement. Boron doping was also performed during the growth of SiNWs.Local vibrational modes of boron (B) in silicon nanowires (SiNWs) synthesized by laser ablationwere observed at about 618 and 640 cm–1 by Raman scattering measurements. Fano broadening dueto coupling between discrete optical phonons and the continuum of interband hole excitations wasalso observed in the Si optical phonon peak. These results prove that B atoms were doped in theSiNWs
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : The epidemiology and pathophysiology of non-erosive gastro-oesophageal reflux disease differs from erosive gastro-oesophageal reflux disease. There is a possibility that non-erosive gastro-oesophageal reflux disease treatment requires a different regimen/approach but it is not yet acknowledged.Aim : To investigate the efficacy of famotidine and omeprazole in the treatment of gastro-oesophageal reflux disease, especially non-erosive gastro-oesophageal reflux disease.Patients and methods : A randomized, open-label trial was conducted. Fifty-four gastro-oesophageal reflux disease patients were assigned to treatment with famotidine at a dosage of 20 mg twice daily; or omeprazole, 20 mg once daily, for a period of 8 weeks. The Short Form-36 Health Survey and Gastrointestinal Symptom Rating Scale administered at baseline and after 8 weeks of treatment as well as a symptom questionnaire were conducted daily.Results : Short Form-36 revealed that gastro-oesophageal reflux disease has severe impact on health-related quality of life. Thirty-nine subjects (77%) were endoscopically diagnosed as non-erosive gastro-oesophageal reflux disease. The mean Gastrointestinal Symptom Rating Scale abdominal pain, and indigestion score of non-erosive gastro-oesophageal reflux disease significantly improved in famotidine-treated patients (P 〈 0.05), but not in the omeprazole. There was no significant change regarding improved heartburn symptoms of non-erosive gastro-oesophageal reflux disease between treatments in the daytime or night-time.Conclusion : Famotidine and omeprazole were both effective in improving symptoms of gastro-oesophageal reflux disease, particularly non-erosive gastro-oesophageal reflux disease.
    Type of Medium: Electronic Resource
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