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  • 1
    Electronic Resource
    Electronic Resource
    Bone mineral density, sex steroids, and mineral metabolism in premenopausal smokers (1994)
    Springer
    Calcified tissue international 55 (1994), S. 403-407 
    Details
    ISSN: 1432-0827
    Keywords: Bone mineral density ; Smokers ; Premenopausal women ; Mineral metabolism ; Sex steroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Smoking is related to decreased bone mass and increased risk of osteoporotic fractures. However, the harmful effects of smoking on bone have not been well characterized. The purpose of this study was to assess the repercussions of smoking on bone mass in premenopausal women, and the relationship between these effects and parameters of mineral metabolism and hormone profile. We measured bone mineral density (BMD) in 101 premenopausal women (47 smokers, 54 nonsmokers) with dualenergy X-ray absorptiometry (DeXA) of the proximal femur and lumbar spine. In a subgroup of the sample (16 smokers, 15 nonsmokers) we measured biochemical indicators of mineral metabolism and hormone profile. BMD in the femoral neck, Ward's triangle, and the intertrochanter region was significantly lower in smoker (P〈0.05) than in nonsmokers. Concentrations of sex hormone-binding globulin were higher, and free testosterone index (FTI) was lower (P〈0.05) in smokers. We found no significant differences between the groups in parameters of mineral metabolism. Concentrations of dehydroepiandrosterone sulfate and free testosterone index were directly correlated with values of BMD in different sites. Our findings show that smoking by premenopausal women is associated with decreased BMD and characteristic changes in the hormone profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298551
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of resonant and non-resonant tunneling in asymmetric coupled quantum wells (1993)
    Springer
    Applied physics 56 (1993), S. 40-42 
    Details
    ISSN: 1432-0630
    Keywords: 73.40.Gk ; 72.80.Ey ; 73.20.Dx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Within the framework of the effective mass approximation, coherent oscillations of a photoexcited electron wave packet in an asymmetric coupled quantum well structure have been studied using a time-dependent Schrödinger equation. In the method of calculation, the continuity of the current across a semiconductor heterojunction is considered. The amplitude and period of the electronic is obtained and in the case of high bias, it is found the existence of electric field-induced tunelling to semiconductor bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351901
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