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  • Bone mineral density  (1)
  • Chemistry  (1)
  • Electrochemical detector  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Measurement of naltrexone in rat brain regions and serum by high performance liquid chromatography with electrochemical detection (1988)
    Springer
    Chromatographia 25 (1988), S. 91-94 
    Details
    ISSN: 1612-1112
    Keywords: High performance liquid chromatography ; Electrochemical detector ; Naltrexone ; Rat brain regions and serum analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is described for the determination of naltrex-one in discrete rat brain regions and serum. Separation and quantitation are performed by reversed-phase high-performance liquid chromatography with electrochemical detection. The drug gave a linear response over the range of 12.5–100ng for either 1.0ml for cerebellar homogenate or 25μl for serum (1.25–10ng on column). Recoveries of naltrexone, added to the homogenate or serum, were 94±7 and 86±6%, respectively, when compared with naltrexone dissolved in water. The mean between-run relative standard deviations were 5.8 and 6.8% for cerebellar homogenate and serum, respectively, over the concentration range studied. The within-run relative standard deviations for cerebellar homogenate (12.5ng/ml) or serum (12.5ng/25μl) were 7.7%. The application of the method to an in vivo animal experiment is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cigarette smoking, sex hormones and bone density in women (1997)
    Springer
    European journal of epidemiology 13 (1997), S. 553-558 
    Details
    ISSN: 1573-7284
    Keywords: Bone mineral density ; Oestrogens ; Sex hormones ; Smoking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It is known that among women over the age of 65, bone mineral density is lower, and the risk of hip fracture higher, in smokers than non-smokers. We report a study in 1334 health pre- and postmenopausal women aged 35–64 years, to determine whether this effect can be attributed to lower oestrogen levels in smokers. Among 676 premenopausal women forearm bone density was no lower in smokers (95% confidence interval 1% lower, 4% higher). Among 543 postmenopausal women who had not used hormone replacement therapy (HRT) for more than a year there was no statistically significant difference, but the lower confidence interval was consistent with a lower bone density in older smokers (by 8% at age 55–59, 16% at age 60–64). Measurements in 194 postmenopausal women not taking HRT showed that oestrone and oestradiol were similar in smokers and non-smokers, as were cortisol and FSH, LH and prolactin. Meta-analysis of the present study and previous studies confirmed significantly higher levels in smokers of the androgens DHEAS (by 37%) and androstenedione (by 34%). Oestrogens were no lower in smokers, and the lower confidence limit excluded more than a trivial effect of smoking in lowering oestrogen. These results indicate that the recognised lower bone density in elderly smokers cannot be explained by an effect of smoking on oestrogen, since in premenopausal women bone density is no lower in smokers and in postmenopausal women oestrogens are no lower in smokers. The data suggest a balance between higher androgen levels but lower rates of conversion of androgens to oestgrogens in smokers. The effect of smoking on bone may be due to impaired response of bone and other target organs to oestrogen, or to actions independent of oestrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007389712487
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the adhesion of polyimide coatings on copper foil (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 45 (1992), S. 947-956 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The peel strength and the color of the copper foil peeled at 90 degrees from five different polyimide films were studied. The interfacial surfaces of copper foil and polyimide were examined by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy dispersion analysis by X-ray (EDAX). There is a correlation between peel strength, and the color of the interfacial side copper caused by oxygen diffusion. Study of the imidization process carried out in vacuum indicates that the geometric arrangements of the atoms of polyimide also play a very important role in peel strength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070450602
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    Paper (German National Licenses)
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