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  • Engineering General  (1)
  • Ultrastructure
  • 1970-1974  (2)
  • 1970  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Morphogenesis of the hair follicle during catagen (1970)
    Springer
    Cell & tissue research 107 (1970), S. 174-186 
    Details
    ISSN: 1432-0878
    Keywords: Hair follicle growth ; Catagen ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During catagen, the transition period between growth and quiescence, the growing (anagen) hair follicle is reorganized to form the resting (telogen) follicle. The last portion of the hair shaft produced at the onset of catagen consists only of cortex. Surrounding the cortex and attached tightly to it are the club cells, which resemble the cortex in structure and development except that the filaments of the club are oriented randomly and do not exhibit the “keratin pattern” seen in the cortex. The club cells in turn are attached to a capsule of germ cells which are formed by progressive transformation of the outer root sheath cells at the middle of the growing follicle. When the capsule of germ cells is formed, the follicle below it undergoes resorption, presumbaly mediated by hydrolytic enzymes. As the follicle disintegrates, the surrounding basal lamina undergoes extensive pleating and is eventually resorbed. Collagen fibers around the basal lamina are engulfed and degraded by the large number of macrophages that surround the hair follicle at this time. The dermal papilla remains as a compact ball of cells just below the capsule of germ cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335223
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  • 2
    Electronic Resource
    Electronic Resource
    Energy transfer through chains of impacting rods (1970)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 2 (1970), S. 363-385 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A solution has been formulated, which allows one to analyse all the major performance characteristics in a chain of impacting elastic ‘rods’. By allowing one end of the elastic chain to impact against a surface which resists penetration according to a specified penetration law it is possible to analyse the impact system of a variety of mechanical devices such as percussive tools and squeeze film dampers. Virtually, unlimited variety in the number and geometry of the impacting rods, and virtually unlimited complexity in the form of the reaction of the terminal face is permitted. A computer program for treating one or two elastic rods has been developed. The program prints out all important stresses as well as the stress history at several selected points. It also prints out the depth of penetration, the energy transferred from rod to rod, the overall energy transfer into the receiver, rebound velocities and times of separation between rods and between rod and 4receiver. Agreement with exact solutions and experiments is demonstrated.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620020306
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