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  • Artikel: DFG Deutsche Nationallizenzen  (3)
  • 1995-1999  (3)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Passive Q switching and mode-locking of Er:glass lasers using VO2 mirrors (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3592-3599 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Passive Q switching of an Er:glass laser with the pulse width varying between 14 and 80 ns has been demonstrated, using three resonator vanadium-dioxide-coated (VO2) mirror samples with temperature-dependent reflectivity and differing in the reflectivity contrast. The reflectivity changes because of a phase transition from a semiconductor to a metallic state. Broad band operating characteristics of VO2 mirrors provide Q switching over a wide range of wavelengths. In addition, mode-locked pulses with much shorter time scales have been observed, due to exciton formation and recombination. A simple criterion is derived for the allowable ambient temperatures at which the Q switching operates effectively. A simple relation has also been found relating the duration of the Q-switched pulse to the contrast in reflectivities of the two mirror phases. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359934
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  • 2
    Digitale Medien
    Digitale Medien
    Production of poly-(β-hydroxybutyrate) from saponified Vernonia galamensis oil by Alcaligenes eutrophus (1998)
    Springer
    Journal of industrial microbiology and biotechnology 21 (1998), S. 46-50 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Keywords: Alcaligenes eutrophus; biodegradable plastics; poly(β-hydroxybutyrate); vegetable oil; Vernonia galamensis; vernolic acid
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Saponified vernonia oil was converted exclusively to poly(β-hydroxybutyrate) (PHB) by Alcaligenes eutrophus in a single-stage batch culture. After harvesting, centrifugation followed by lyophilization, the resulting dried cells contained up to 42.8 wt% PHB having a peak molecular mass of 381 863 Da, weight-average molecular mass of 308 390 Da, and a polydispersity of 1.1. The PHB had a melting point (Tm) range of 163–174°C with a maximum at 172°C (lit. Tm, 175°C), and heat of fusion of 18.43 cal g−1. Fermentation performed under varying conditions of nitrogen limitation indicated that there was no significant effect of nitrogen concentration on the molecular mass of PHB produced from vernonia oil by A. eutrophus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/sj.jim.2900555
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  • 3
    Digitale Medien
    Digitale Medien
    Modification of in Vivo and in Vitro TNF-α, IL-1, and IL-6 Secretion by Circulating Monocytes During Hyperbaric Oxygen Treatment in Patients with Perianal Crohn's Disease (1997)
    Springer
    Journal of clinical immunology 17 (1997), S. 154-159 
    Details
    ISSN: 1573-2592
    Schlagwort(e): Crohn's disease ; hyperbaric oxygen ; cytokines
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Treatment of perianal inflammatory lesions in Crohn's disease (CD) is unsatisfactory and novel treatment modalities are pursued. We have recently reported a good clinical effect of hyperbaric oxygen (HBO) treatment in perianal CD. In the present study, seven patients with perianal CD were subjected to daily sessions of HBO in a multiplace hyperbaric chamber. Each patient received a total of 20 sessions during a time period of 1 month, and IL-1, IL-6, and TNF-α measurements were done several times during the initial sessions and after completing therapy. Pretreatment cytokine levels were elevated in patients compared to age-matched 10 normal controls. During the first 7 days of treatment, IL-1, IL-6, and TNF-α levels in supernatants of LPS-stimulated monocytes derived from patients' peripheral blood were decreased compared to pretreatment levels. Parallel measurements of serum IL-1 levels revealed an initial elevation and thereafter decreased levels, which remained low throughout the first week of HBO treatment. After completion of therapy, cytokine levels increased to pretreatment values. We conclude that alterations in secretion of IL-1, IL-6, and TNF-α may be related to the good clinical effect of HBO treatment in CD patients with perianal disease.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1027378532003
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