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  • 1
    ISSN: 1433-2965
    Keywords: Key words:Bone mineral density (BMD) – Dual-energy X-ray absorptiometry (DXA) – Femoral neck – Hispanic – Lumbar spine – Mexican women
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: The aim of this study was to generate standard curves for normal spinal and femoral neck bone mineral density (BMD) in Mexican women using dual-energy X-ray absorptiometry (DXA), to analyze geographic differences and to compare these with “Hispanic” reference data to determine its applicability. This was a cross-sectional study of 4460 urban, clinically normal, Mexican women, aged 20–90 years, from 10 different cities in Mexico (5 in the north, 4 in the center and 1 in the southeast) with densitometry centers. Women with suspected medical conditions or who had used drugs affecting bone metabolism, were excluded. Lumbar spine BMD was significantly higher (1.089 ± 0.18 g/cm2) in women from the northern part of Mexico, with intermediate values in the center (1.065 ± 0.17 g/cm2) and lower values (1.013 ± 0.19 g/cm2) in the southeast (p〈0.0001). Similarly, femoral neck BMD was significantly higher in women from the north (0.895 ± 0.14 g/cm2), intermediate in the center (0.864 ± 0.14 g/cm2) and lower (0.844 ± 0.14 g/cm2) in the southeast part of Mexico (p〈0.0001). Northern Mexican women tend to be taller and heavier than women from the center and, even more, than those from the southeast of Mexico (p〈0.0001). However, these differences in BMD remained significant after adjustment for weight (p〈0.0001). A significant loss (p〈0.0001) in BMD was observed from 40 to 69 years of age at the lumbar spine and up to the eighth decade at the femoral neck. Higher and lower lumbar spine values, as compared with the “Hispanic” population, were observed in Mexican mestizo women from the northern and southeastern regions, respectively. In conclusion, there are geographic differences in weight and height of Mexican women, and in BMD despite adjustment for weight.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 20 (1990), S. 506-511 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The results of an investigation to determine the mechanism(s) of oxidation of sulphide ions on a gold electrode are discussed. The cyclic voltammetry results are presented in Part I and characterization results after various electrochemical pretreatments are to follow in Part II. The cyclic voltammetry studies show that several stages are involved in oxidation of sulphide ions to form elemental sulphur. Initially, sulphide ions undergo underpotential deposition to form chemisorbed sulphur as isolated atoms. As oxidation proceeds, a monolayer of chemisorbed atoms is formed which reacts with sulphide ions in solution to form polysulphides at higher potentials. As the potential for oxidation is further increased elemental sulphur is produced. The reduction of polysulphide to hydrosulphide ions occurs by a 2-electron transfer process whereas the reduction of elemental sulphur occurs by a l-electron transfer process. The latter reaction involves the formation of an activated complex which is a relatively slow process.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 20 (1990), S. 512-517 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The results of studies to characterize the gold/aqueous hydrosulphide solution interface are presented in this paper. The interface was characterized with impedance spectroscopy, contact angle and cathodic charge transfer measurements. The studies complement the cyclic voltammetry investigations presented in Part I. A detailed mechanism of the oxidation and reduction of sulphur species at gold electrodes has been suggested on the basis of this investigation. The results show that the surface becomes hydrophobic under the conditions when polysulphide ions or elemental sulphur are present at the interface.
    Type of Medium: Electronic Resource
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