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  • 1
    Electronic Resource
    Electronic Resource
    Platelet-activating factor (PAF) and the development of chronic subdural haematoma (1994)
    Springer
    Acta neurochirurgica 129 (1994), S. 20-25 
    Details
    ISSN: 0942-0940
    Keywords: Chronic subdural haematoma ; histochemistry ; PAF-acetylhydrolase ; platelet-activating factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Platelet activating factor (PAF) content and PAF-acetylhydrolase (PAFAH) activity were measured in the plasma and haematoma of 34 chronic subdural haematoma (CSH) patients. The plasma PAF level in patients with CSH was higher than that in healthy controls. Although there was no correlation between the plasma PAF levels and the interval between the onset of symptoms and the day of sampling, namely, the interval after bleeding, the haematoma PAF level gradually decreased according to the interval after the onset of symptoms. There was no difference between plasma PAFAH activity in patients with CSH and that in healthy controls, and haematoma enzyme activity gradually increased correlated with the interval between the onset of symptoms and surgery. In addition, the localization of PAF in haematoma capsules was histochemically determined. PAF was solely localized to the peri-sinusoidal vessels in the outer membrane of haematoma capsules. Based on these biochemical and histochemical studies, we speculated that PAF may play a role in the development of chronic subdural haematomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400868
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in the cerebral vascular bed in experimental hydrocephalus: An angio-architectural and histological study (1992)
    Springer
    Acta neurochirurgica 114 (1992), S. 43-50 
    Details
    ISSN: 0942-0940
    Keywords: Hydrocephalus ; ventriculo-peritoneal shunting ; microscopy ; cerebral blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The angio-architectural and histological changes of small cerebral blood vessels in experimental hydrocephalus were studied to assess the changes of the vascular bed in the cerebral mantle. Change of the microvasculature assessed from microcorrosion casts by scanning electron microscopy (SEM) and the histological changes shown by light and electron microscopy were compared before and after shunting for hydrocephalus. The changes of the rCBF were also evaluated by the hydrogen clearance method. In hydrocephalus, a reduction in the number and caliber of the capillaries was noted in both the white and gray matter in the SEM study, but the capillaries were preserved and changes were mild and nonspecific in the electron microscopic examination. Shunting resulted in the reversal of all these changes to normal along with recovery of the rCBF, which had decreased in hydrocephalus. These observations suggest that changes of the vascular bed participate in the alteration of cerebral mantle width in the hydrocephalic process, and that the changes of the microvasculature result not only from damage to the capillaries themselves but also from changes of the perivascular structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01401113
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    ArF excimer laser doping of boron into silicon (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3656-3659 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Boron doping into silicon has been investigated using an ArF excimer laser. Dopant atoms are obtained by pyrolysis of BF3. Two kinds of doping, the doping in BF3 ambients and the doping using adsorbed layers, have been performed. In both cases, the sheet resistance decreases with increasing the number of pulses. The surface concentration and the junction depth increase with the number of pulses. From these results, it is found that dopant atoms are supplied from only adsorbed layers of BF3 formed on the silicon surface. Moreover, the supply of dopant atoms from adsorbed layers limits the doping process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339245
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    150 Mbits−1 ch−1 12-channel optical parallel interface using an LED and a PD array (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. S479 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An optical fibre parallel interface has been developed for card-cage to card-cage and board-to-board interconnections, representing a practical and promising optical interconnection. For a system design of a 12 channel, 150 Mbits−1 ch−1 optical parallel interface over a distance of 100 m, it is shown that the choice of a long wavelength LED/PD array with graded index optical fibre array meets the requirements for both power budget and skew limitation over this transmission distance. A 7 mm thick compact package transmitter and receiver module was developed, employing a Zn-doped, mesa structure, 1.3μm LED array and an isolated InGaAs PD array. An optical parallel transmission experiment over 100 m was successfully demonstrated using these modules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619513
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    Paper (German National Licenses)
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