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  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Merkel cells in human fetal eccrine glands (1993)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 129 (1993), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The presence of human Merkel cells in the eccrine ridges and eccrine germs was studied, using antibodies to simple epithelial keratins, in separated epidermal sheets with attached eccrine ducts. The localization of Merkel cells could be analysed three-dimensionally in the wet, whole-mount of the stained sheets. In the plantar skin of a 12-week-old human fetus, immunoreactive (ir-) Merkel cells were randomly located in the flattened epidermis. In the plantar skin of a 15-week-old human fetus, there was early development of eccrine germs, and Merkel cells were concentrated in eccrine gland ridges. In the plantar skin of a 20-week-old human fetus, eccrine germs were well formed and ir- Merkel cells were located within the developing eccrine ridges and ducts. In the plantar skin of adults, the eccrine concentration of Merkel cells was markedly reduced. Concentration of Merkel cells on the eccrine structures was also observed in the scalp skin of human fetuses. This tendency continued into adult life, although there was a marked reduction in the total number of Merkel cells. These findings suggest that epidermal Merkel cells move down into the eccrine ducts as eccrine germs extend into the mesenchyme. Alternatively, they may develop de novo from the keratinocytes of the eccrine duct. In view of the expression of nerve growth factor receptor in fetal Merkel cells, it is postulated that these eccrine gland Merkel cells play a role in the formation of the periglandular nerve plexus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1993.tb00481.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Arrector pili muscles surround human facial vellus hair follicles (1993)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 129 (1993), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Arrector pili muscles have been assumed to attach to one side of the hair follicle, specifically the posterior wall of the bulge area. In this study, we demonstrated immunohistochemically that desmin-reactive arrector pili muscle, admixed with the connective tissue sheath, is present around the entire circumference of the vellus hair follicle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1993.tb03515.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A high concentration of Merkel cells in the bulge prior to the attachment of the arrector pili muscle and the formation of the perifollicular nerve plexus in human fetal skin (1993)
    Springer
    Archives of dermatological research 285 (1993), S. 261-268 
    Details
    ISSN: 1432-069X
    Keywords: Merkel cell ; Bulge ; Arrector pili muscle ; Nerve plexus ; Skin development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The distribution of Merkel cells in human fetal hair follicles was studied using whole mounts of separated epidermis with attached hair follicles. The technique had the advantage of enabling the elucidation of the spatial relationships of Merkel cells with other cells in the skin. In a 16-week-old fetus the hair anlagen had formed one or two epithelial swellings of variable size. In a 17-week-old fetus sebaceous glands and the bulge of the hair follicle were recognizable and immunoreactive Merkel cells were present in the bulge and surrounding the acrotrichium (intraepidermal follicular canal). In a 20-week-old fetus the sebaceous gland and bulge were well formed and immunoreactive Merkel cells were concentrated in the bulge and infundibulum. In vertical sections of a 20-week-old fetus immunoreactive Merkel cells were also situated in the vicinity of the bulge. Arrector pili muscles were first observable in a 24-week-old fetus being weakly stained with anti-desmin antibody. In a 24-week-old fetus, nerves were also stained within the arrector pili muscles with S-100 protein antibody. In the presumptive arrector pili muscle immunoreactivity for S-100 protein developed before or at the same time as immunoreactivity for desmin. Merkel cells or their products in the bulge may serve as attractants for the growing arrector pili muscle which contain peripheral nerves. Following our report that dermal Merkel cells influence the formation of the dermal nerve plexus, perifollicular Merkel cells near the bulge may also play an inductive and growth-stimulative role for the perifollicular nerve plexus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371594
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Laser chemical processing of magnetic materials for recording-head application (1994)
    Springer
    Applied physics 58 (1994), S. 359-363 
    Details
    ISSN: 1432-0630
    Keywords: 81.60Bn ; 81.40.−z ; 85.70.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A laser-induced thermochemical reaction has been used to etch single crystalline magnetic ferrite for industrial application to recording-head processing. Scanning focused Ar-ion laser irradiation to ferrite in flowing aqueous solutions of KOH or H3PO4 resulted in etch rates of 350–400 μm/s with aspect ratios of up to 40. Metal-In-Gap (MIG) head structures with Sendust (FeAlSi) have been successfully fabricated using laser chemical processing. The MIG head fabricated by laser chemical processing showed better performance than that by conventional mechanical machining.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323610
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    Paper (German National Licenses)
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