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  • 1995-1999  (3)
  • 1965-1969
  • Analytical Chemistry and Spectroscopy  (1)
  • Key words: Trabecular bone strength — Bone mineral density — Proximal tibia.  (1)
  • mechanism  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The Relation Between Trabecular Bone Strength and Bone Mineral Density Assessed by Dual Photon and Dual Energy X-Ray Absorptiometry in the Proximal Tibia (1996)
    Springer
    Calcified tissue international 59 (1996), S. 311-314 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Trabecular bone strength — Bone mineral density — Proximal tibia.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The feasibility of two noninvasive methods [dual photon absorptiometry (DPA) and dual energy X-ray absorptiometry (DXA)] for prediction in vivo of local variations of trabecular bone strength within the proximal tibia was evaluated in 14 cadaveric knees. Trabecular bone strength was measured using an osteopenetrometer and from destructive compression tests performed on bone cylinders, thus measuring the penetration strength and ultimate strength in the medial, lateral, and central part of the tibial bone specimens. Linear regression analysis showed significant relations between BMD measured by DPA (r2= 72%) or DXA (r2= 73%) and ultimate strength. Even closer relations between BMD (DPA: r2= 80%, DXA r2= 81%) and penetration strength of trabecular bone were found. We conclude that DPA and DXA are suitable methods for evaluation in vivo of local variations in trabecular bone strength within the proximal tibia, and could easily be performed preoperatively before insertion of total knee arthroplasty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900131
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of DMSO and CH3S(O)OH from the gas phase reaction between DMS and OH (1996)
    Springer
    Journal of atmospheric chemistry 24 (1996), S. 299-315 
    Details
    ISSN: 1573-0662
    Keywords: products ; mechanism ; gas phase ; dimethylsulfide ; hydroxyl radical ; dimethylsulfoxide ; methanesulfinic acid ; air
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Products and mechanisms have been investigated for the reactions between dimethylsulfide (DMS) and dimethylsulfoxide (DMSO) and the hydroxyl radical (OH) in the presence of NOx. All of the experiments were performed in a 480 L reaction chamber, applying Fourier transform infrared spectroscopy (FT-IR) and ion chromatography as the analytical techniques. In addition to the sulfur containing products that are known to be produced from the gas phase reaction between DMS and OH (SO2, dimethylsulfone, methylsulfonyl peroxynitrate, methanesulfonic acid, H2SO4), DMSO and methanesulfinic acid (CH3S(O)OH) were also observed as products. Only SO2, DMSO2 and methylsulfonyl peroxynitrate were found as sulfur containing products in the reaction between DMSO and OH. Based on these new results we propose a mechanism for the atmospheric oxidation of DMS and DMSO by OH radical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210288
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Collision-induced dissociation of C60-: Effect of energy-coupling processes on the dissociation dynamics (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 114-118 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Dissociation of C60- ions induced in 30 keV collisions with atomic and molecular gases has been studied. The pattern of negativeion formation from C60- precursors is found to be distinctly different from that obtained for positive-ion fragments from C60+ precursors in that the collision-induced dissociation spectrum in the former case is dominated by small negative clusters, presumably of linear geometry, Simple arguments utilizing the relationship of electrostatic properties of different molecular structures to their electron affinities and ionization energies have been invoked to rationalize these observations. The difference in the dissociation dynamics of C60- and C60+ ions is discussed in terms of competition between different energy-coupling schemes involving either electronic degrees of freedom or nuclear (vibrational) degrees of freedom.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290090203
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    Paper (German National Licenses)
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