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  • 1
    Electronic Resource
    Electronic Resource
    Does Leptin Have an Effect on Bone in Adult Women? (1998)
    Springer
    Calcified tissue international 63 (1998), S. 453-455 
    Details
    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
    URL: http://dx.doi.org/10.1007/s002239900556
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion of Water into Quartz and Silica Glass (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 248-249 (May 1997), p. 389-394 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.248-249.389.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Trisomie 13 bei einem 4 jährigen Jungen (1997)
    Springer
    Monatsschrift Kinderheilkunde 145 (1997), S. 482-484 
    Details
    ISSN: 1433-0474
    Keywords: Schlüsselwörter Chromosomenaberration ; Psychomotorische Entwicklungsverzögerung ; Trisomie 13 ; Key words Chromosomal aberration ; Psychomotor delay ; Trisomy 13
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The case of a four-year old boy with trisomy 13 is described. The boy does not have detectable cardiac or cerebral malformations. However, he suffers from severe psychomotor delay, muscular hypotonia, cerebral convulsions, bilateral buphthalmos and bilateral optic nerve atrophy. Trisomy 13 was detected in all mitoses analysed in lymphocytes and in skin fibroblasts. Discussion: This case should serve as a reminder that trisomy 13 is compatible with long-term survival.
    Notes: Zusammenfassung Der Fall eines 4 jährigen Jungen mit Trisomie 13 wird beschrieben. Der Junge weist keine erkennbaren kardialen oder zerebralen Mißbildungen auf, leidet jedoch an schwerer psychomotorischer Retardierung, Muskelhypotonie, zerebralen Krampfanfällen, bilateralem Buphthalmus und bilateraler Atrophie des N. opticus. In allen analysierten Mitosen aus Lymphozyten und Hautfibroblasten fand sich eine Trisomie 13. Diskussion: Dieser Fall soll daran erinnern, daß Trisomie 13 mit einem langfristigen Überleben vereinbar ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001120050145
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of water diffusion into quartz using ion beam analysis techniques (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 217-219 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Diffusion of water into quartz was studied by measuring H and 18O concentration profiles in surface layers of quartz samples treated hydrothermally in the range of 125° C to 200° C. Sample surfaces were orientated normal to the c-axis. The measurements were performed using the nuclear reactions 1H(15N,αγ)12C and 18O(p,α)15N. The diffusion profiles have widths of up to 500 nm. Diffusion rate constants derived from the profiles are in the range of 10–15 cm2/s to 10–18 cm2/s and show a distinct temperature dependence, yielding a rough estimate of about 60 kJ/mole for the activation energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050388
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  • 5
    Electronic Resource
    Electronic Resource
    Water uptake of quartz investigated by means of ion-beam analysis (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 114-116 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The diffusion of water into quartz was studied by measuring depth profiles of hydrogen and oxygen in hydrothermally treated samples using ion-beam analysis methods. Diffusion data were obtained in the temperature range 60 to 200 °C. It was found that the initial H content of the individual quartz specimen plays a crucial role for the diffusion rate, which also depends on the orientation of the sample surface relative to the quartz c-axis. External factors which possibly influence the diffusion data were examined. Hydrogen depth profiles measured on a prehistoric quartz artifact were found to be compatible with an extrapolation of the diffusion data to ambient temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051455
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  • 6
    Electronic Resource
    Electronic Resource
    SIMS and RBS analysis of leached glass: Reliability of RSF method for SIMS quantification (1996)
    Springer
    Journal of materials science 7 (1996), S. 373-379 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The reliability of the relative sensitivity factor (RSF) approach for secondary ion mass spectrometry (SIMS) quantification of the leached layers on glass was investigated by measuring comparable samples of glass with SIMS and RBS (Rutherford backscattering spectrometry). The RSF factors were calculated using the nominal bulk compositions. Accurate results can be obtained only when the leached layer and the bulk glass have the same major elemental compositions (Si and O) and the matrix effect is inhibited. The concentrations of the different elements in the leached layer obtained from the comparable samples measured by SIMS and RBS are coincident within a factor of 2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180772
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  • 7
    Electronic Resource
    Electronic Resource
    The segregation of poly(styrene-b-isoprene) diblock copolymers to the surface of a polystyrene melt: the effect of the ratio of block lengths (1999)
    Springer
    The European physical journal 7 (1999), S. 411-419 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 68.10.Gw Interface activity, spreading - 68.10.m Fluid surfaces and fluid-fluid interfaces - 68.55.a Thin film structure and morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The effect of the ratio of block lengths on the interfacial partitioning of poly(styrene-block-1,4 isoprene) diblock copolymers from their mixtures with polystyrene homopolymer melt is investigated utilizing a series of copolymers with almost constant molecular weight but different compositions. The concentration profile of the copolymer is measured directly using the nuclear reaction analysis technique; a segregation of the diblock is found at both the air/polymer surface, due to the lower surface energy of polyisoprene, and at the substrate/polymer interface. No significant effect of the block length ratio on the free-surface excess was observed. The block molecular weights have apparently led to dangling chain conformations in the non-overlapping mushroom and in the overlapping mushroom regimes whereas the brush regime was not accessible; no indications of a real border between the two former regimes was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050629
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  • 8
    Electronic Resource
    Electronic Resource
    Temperature-induced changes in the composition of floatglass surfaces (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 353 (1995), S. 408-412 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Floatglass is an important kind of commercial glass, comprising the main body of modern flat glass used in buildings and vehicles. The stoichiometry of the surface layer differs from that of the bulk and will usually change due to subsequent high-temperature process steps or attack by water or humidity. Glass samples have been investigated by means of ion beam analysis. Using resonant nuclear reaction analysis (15N technique), hydrogen concentration profiles have been determined. Profiles of the heavier glass constituents, especially sodium and tin, have been obtained by RBS. Changes in the composition of the floatglass surfaces caused by subsequent temperature treatment (up to 700 °C) and by controlled hydration treatment are reported. Possible mechanisms of hydrogen uptake and release are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021653530408
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature-induced changes in the composition of floatglass surfaces (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 353 (1995), S. 408-412 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Floatglass is an important kind of commercial glass, comprising the main body of modern flat glass used in buildings and vehicles. The stoichiometry of the surface layer differs from that of the bulk and will usually change due to subsequent high-temperature process steps or attack by water or humidity. Glass samples have been investigated by means of ion beam analysis. Using resonant nuclear reaction analysis (15N technique), hydrogen concentration profiles have been determined. Profiles of the heavier glass constituents, especially sodium and tin, have been obtained by RBS. Changes in the composition of the floatglass surfaces caused by subsequent temperature treatment (up to 700°C) and by controlled hydration treatment are reported. Possible mechanisms of hydrogen uptake and release are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322079
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