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  • Polymer and Materials Science  (2)
  • Key words: Bone — Bone density — Bone metabolism — Leptin — Obesity.  (1)
  • Knochenstoffwechsel  (1)
  • Metabolische Osteopathien  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 63 (1998), S. 453-455 
    ISSN: 1432-0827
    Keywords: Key words: Bone — Bone density — Bone metabolism — Leptin — Obesity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Recent studies have implicated leptin in the modulation of bone mass during skeletal development. Whether leptin also exerts an influence on bone after growth has stopped is unknown at present. In this cross-sectional study on 94 women (60 premenopausal, 34 postmenopausal) aged 40–60 years, we analyzed the relationship between serum leptin and bone density and bone cortex geometry and bone metabolism. Total and trabecular bone density as well as total and cortical bone area were determined by quantitative computed tomography (QCT) at the distal radius. Bone metabolism was assessed by measuring bone-specific alkaline phosphatase, osteocalcin, procollagen type I C-terminal propeptide (PICP) and collagen type I C-terminal telopeptide in serum, and deoxypyridinoline in urine samples. None of the indices of bone density or geometry was significantly related to leptin serum concentrations (P 〉 0.05) before or after adjustment for body mass index (BMI). PICP was associated with serum leptin in the postmenopausal group only (r =−0.40 after adjustment for BMI; P= 0.009). Yet, as none of the other markers of bone metabolism exhibited a significant correlation with serum leptin in any of the menopausal groups, this association is likely to be due to the influence of extraskeletal factors on PICP serum levels. Thus, it appears that leptin has less influence on the mature than on the growing skeleton.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatsschrift Kinderheilkunde 148 (2000), S. 334-341 
    ISSN: 1433-0474
    Keywords: Schlüsselwörter Bisphosphonate ; Knochenstoffwechsel ; Metabolische Osteopathien ; Osteogenesis imperfecta ; Key words Bisphosphonates ; Bone turnover ; Metabolic osteopathy ; Osteogenesis imperfecta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Bisphosphonates are a class of potent inhibitors of bone resorption which are increasingly used in pediatrics. Potential applications tested so far include short term treatment of hypercalcemia and continuous therapy in disorders with decreased bone mass (osteogenesis imperfecta, idiopathic juvenile osteoporosis, secondary osteoporosis) or increased bone turnover (hyperphosphatasia, fibrous dysplasia). The efficacy of bisphosphonates is best documented in the treatment of osteogenesis imperfecta, where they were shown to decrease fracture rate and to increase mobility. While these results are very encouraging, very little is known on the effect of long term bisphosphonate treatment on bone development. This remains the most critical aspect of their use in pediatrics. Therefore, pediatric use of bisphosphonates should at present be limited to specialised centers.
    Notes: Zusammenfassung Medikamente aus der Klasse der Bisphosphonate sind sehr wirksame Inhibitoren der Knochenresorption, die in jüngster Zeit zunehmend auch in der Pädiatrie Verwendung finden. Bisher beschriebene Einsatzgebiete sind die Akuttherapie von Hyperkalzämiezuständen und die Dauertherapie von Erkrankungen, welche mit erniedrigter Knochenmasse (Osteogenesis imperfecta, idiopathische juvenile Osteoporose, sekundäre Osteoporose) oder erhöhtem Knochenumsatz (Hyperphosphatasie, fibröse Dysplasie) einhergehen. Am besten dokumentiert ist die Wirksamkeit von Bisphosphonaten bei der Therapie der Osteogenesis imperfecta, wo sie die Frakturrate verringern und die Mobilität deutlich verbessern können. Wenn auch die bisherigen Erfahrungen sehr ermutigend sind, bleibt doch der nicht ausreichend bekannte Einfluß einer Dauertherapie auf die Knochenentwicklung weiterhin der kritischste Punkt in der pädiatrischen Anwendung. Daher sollte derzeit die Therapie von Kindern mit Bisphosphonaten auf spezialisierte Zentren beschränkt bleiben.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 435-438 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Hydrogen and hydrogen-containing species (H2O, OH etc.) play a dominant role in the various properties of glass surfaces and technical oxidic thin films deposited on glass. The amount of hydrogen and its distribution with depth are influenced by preparation and production processes, film materials, density and voids, etc. The 15N nuclear reaction technique, which works quantitatively and non-destructively, was used to investigate glass surfaces and thin films of TiO2, Ta2O5 and SiO2 produced by sol-gel processes, reactive evaporation, sputtering and ion plating on glass substrates. An increase or decrease in hydrogen content influences optical and mechanical properties such as the refractive index and adhesion of the films.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 16 (1990), S. 331-334 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The hydrogen concentration profiles of electrochromic multilayer systems produced by evaporation have been determined by means of nuclear reaction analysis. The H content of individual oxidic materials was found to be larger than for single films, especially for SiO2. The time-dependent H uptake under various ambient conditions was investigated. Systems produced by ion plating were also profiled for hydrogen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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