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  • Articles: DFG German National Licenses  (9)
  • 1985-1989  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Structural and electrical properties of epitaxial Si on insulating substrates (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 586-588 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work the role of extended defects on the electrical performance of epitaxial silicon on substrates containing an insulating SiO2 layer has been examined. The buried SiO2 layers in the substrates were obtained by two techniques: implantation of oxygen and zone melt recrystallization. In order to make a thorough structural and electrical evaluation of silicon on the insulator substrates, 5-μm-thick epitaxial capping layers have been simultaneously deposited via chemical vapor deposition on representative insulating substrates and reference wafers. The average minority-carrier lifetime was found to vary from 2.5 to 242 μs depending on the density and distribution of dislocations emerging from the capping epitaxial layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101841
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Outdiffusion of oxygen and carbon in Czochralski silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 69-71 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The outdiffusion behavior of oxygen and carbon in heat-treated Czochralski (CZ) silicon has been investigated by secondary ion mass spectroscopy. The results show that oxygen diffusion is greatly retarded by oxygen precipitation and strongly support a vacancy-dominant diffusion mechanism for oxygen in silicon. In carbon-doped CZ silicon, the diffusion of both oxygen and carbon is greatly enhanced at 750 °C, but is significantly retarded at 1000 °C. In conjunction with the infrared absorption data, the enhanced diffusion has been attributed to the formation of fast-diffusing O-C complexes, while the retarded diffusion of carbon has been tentatively attributed to the formation of slow-diffusing complexes, such as Si-O-C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100126
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Minority-carrier lifetime of magnetic field applied Czochralski silicon wafers (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1850-1852 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of minority-carrier lifetimes and diffusion length on starting silicon materials grown by the magnetic field applied Czochralski (MCZ), conventional Czochralski(CZ), and float-zone (FZ) methods has been investigated with a capacitance-time relaxation technique. MCZ silicon yields longer minority-carrier lifetimes and diffusion length than those of both CZ and FZ silicon materials. The generation lifetime of MCZ silicon increases, while the recombination lifetime decreases, with the initial oxygen concentration. These characteristics are correlated with grown-in defects and gettering by oxygen-related defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100374
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Book reviews (1988)
    Springer
    Wood science and technology 22 (1988), S. 191-192 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00355854
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of the novel α-glucosidase inhibitor 4-O-α-D-glucopyranosyl-N-methylmoranoline (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 1809-1811 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187090085
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Serum C3 and C4 levels and complement-dependent antibody-mediated cytotoxic activity of islet cell surface antibody in Type 1 (insulin-dependent) diabetic children (1987)
    Springer
    Diabetologia 30 (1987), S. 869-873 
    Details
    ISSN: 1432-0428
    Keywords: Human ; insulin-dependent ; diabetes mellitus ; complement ; antibody-dependent cell cytotoxicity ; auto-antibodies ; antigens ; surface ; Islands of Langerhans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The role of complement in the pathogenesis of diabetes was studied in 31 Type 1 (insulin-dependent) diabetic children by assaying serum islet cell surface antibody, C3, C4 and serum complement-dependent antibody-mediated cytotoxicity. Nine of 21 islet cell surface antibody-positive children were within 5 months of disease onset and showed significantly lower serum C3 and C4 levels than either 1 year later or the remainder of the islet cell surface antibody-positive children at 6–12 months after disease onset. The overall trend of all islet cell surface antibody-positive diabetic children within 1 year of disease onset was toward increased serum C3 and C4 levels as the disease progressed. Serum C4 concentration and complement-dependent antibody-mediated cytotoxicity which showed an initial negative correlation were uncorrelated 1 year later. Four children who were initially strongly islet cell surface antibody-positive but negative 1 year later also exhibited significantly higher (p〈0.05) mean serum C4levels after 1 year. There was a significant decrease in complement-dependent antibody-mediated cytotoxicity when sera from the diabetic children were treated with either ethylene glycol tetra-acetic acid or ethylene diamine tetra-acetic acid. These data strongly suggest that complement-dependent antibody-mediated cytotoxicity induced by the classical complement pathway involving an islet cell surface antibody may play an important role in the pathogenesis of Type 1 diabetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274796
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Facilitation of milk ejection-related activation of oxytocin-secreting neurones by osmotic stimulation in the rat (1987)
    Springer
    Experimental brain research 65 (1987), S. 312-316 
    Details
    ISSN: 1432-1106
    Keywords: Oxytocin cells ; Osmotic stimuli ; Milk ejection ; Paraventricular nucleus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Extracellular recordings were made from antidromically identified neurosecretory cells in the paraventricular nucleus of the hypothalamus in urethane-anesthetized lactating rats. Sixty-six percent of the rats tested (n=80) showed reflex milk ejections during suckling. Oxytocin neurones could be distinguished from other neurosecretory neurones by a characteristic high-frequency burst of spikes displayed before a reflex milk ejection. Twenty-three of the oxytocin neurones recorded from twenty-three individual animals were tested for the effect of intraperitoneal injection of 1.5 M NaCl (1 ml), which raised the plasma osmotic pressure from 299.3±2.4 (SE) mosmole/kg to 313.0±2.4 mosmole/kg. The injection significantly increased not only the firing rate of the oxytocin neurones (from 1.7±0.3 spikes/s to 4.9±0.6 spikes/s) but also the number of spikes per burst (from 53.6±7.4 to 75.5±7.5) and burst duration (from 3.38±0.22 s to 3.80±0.18 s). The amplitude of reflex milk ejection was also increased to 1.9 times. However, the injection did not change the interval between bursts. On the other hand, intraperitoneal injection of 0.15 M NaCl affected neither these parameters of oxytocin neurones nor the amplitude of milk ejection. Some of the antidromically identified neurones recorded in the rats which showed no detectable reflex milk ejection during suckling displayed intermitent bursts of action potentials. Ten of these neurones in ten individual rats were tested for the effect of 1.5 M NaCl. The number of spikes per burst was significiantly increased and reflex milk ejection was induced by the injection in eight of these rats. Then the bursts became milk ejection-related. These results indicate that increased plasma osmotic pressure influences the milk ejection reflex by enhancing the burst activity of oxytocin neurones which precedes reflex milk ejection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236303
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The role of the anteroventral 3rd ventricle area in the osmotic control of paraventricular neurosecretory cells (1989)
    Springer
    Experimental brain research 76 (1989), S. 497-502 
    Details
    ISSN: 1432-1106
    Keywords: AV3V ; Paraventricular nucleus ; Oxytocinergic cell ; Vasopressinergic cell ; Osmoreceptor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To obtain electrophysiological evidence of an involvement of the anteroventral 3rd ventricle (AV3V) area in the osmotic control of neurohypophysial hormone release, extracellular action potentials of paraventricular (PVN) oxytocinergic and vasopressinergic cells during osmotic stimulation induced by i.p. injection of 1.5 M-NaCl solution were obtained from urethane anesthetized AV3V-lesioned, intact and sham-lesioned lactating rats. In intact and sham-lesioned rats the electrical activities of both oxytocinergic and vasopressinergic cells increased in response to the i.p. injection of hypertonic saline. After electrolytic lesion of the AV3V, the responsiveness of both types of cells to osmotic stimuli was severely impaired, whereas oxytocinergic cells were still capable of responding to suckling stimuli by displaying high frequency discharges of action potentials preceding milk-ejection. These results provide electrophysiological evidence that destruction of the AV3V area selectively impairs osmoregulatory input to PVN neurones and that the area has osmosensitive elements which activate the PVN neurosecretory cells when plasma osmotic pressure rises.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248905
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Chronological evaluation of the occurrence and growth of the traumatic intracerebral hematoma (1989)
    Springer
    Neurosurgical review 12 (1989), S. 149-152 
    Details
    ISSN: 1437-2320
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01790638
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    Paper (German National Licenses)
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