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  • 1
    Electronic Resource
    Electronic Resource
    Compositional distribution in the cross section of chemical-vapor-deposited Nb3Ge tape conductors and its correlation with superconducting properties (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 305-310 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chemical-vapor-deposited Nb3Ge tapes 2.5 mm wide with Nb3Ge layer thickness of 5–60 μm were prepared under various processing conditions. Though the depth profile of the Nb concentration in the Nb3Ge tapes determined by x-ray microanalysis was fairly uniform, with a variation less than 4 at. % for many Nb3Ge tapes, the distribution of the Nb concentration over the whole cross section of the Nb3Ge layer varied considerably, with a variation of 10–18 at. % for various Nb3Ge tapes. In this distribution, Nb concentrations at the tape edges were found to be higher than those on its sides for all of the Nb3Ge tapes prepared. The origin of this singular distribution of the composition is discussed. The Tc values for narrower tapes cut out lengthwise from the 2.5-mm-wide tapes were measured resistively. They correlated closely with the compositional distribution in the cross section of the Nb3Ge tapes. The Tc values (midpoints) of Nb3Ge tapes incorporating compositions within the Nb concentration range of 70–75 at. % were found to be near or above 20 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338821
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  • 2
    Electronic Resource
    Electronic Resource
    Propagation of intense ion beams across a plasma-filled magnetic cusp (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4095-4101 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preionized plasma has been compared with vacuum and with neutral gas as a medium for the propagation of intense ion beams across magnetic fields. Two cusp-injection ion ring experiments have been used to study the effectiveness of these three cusp-fill media for space-charge neutralization, as shown by the subsequent spreading of the injected rings. In the ion ring experiment a (approximately-less-than)100-ns ion beam was injected into ∼20-eV plasma fills of (approximately-less-than)1012/cm3, giving much better propagation than vacuum, but not as good as 100-mTorr H2 gas. In the long-pulse ion ring experiment with (approximately-greater-than)200-ns beam rise time, plasma fill and vacuum gave similar propagation. The results suggest that for complete neutralization of space charge in ion beams propagating across magnetic fields, background media must be provided to meet certain minimum requirements of conductivity and collisionality which depend upon the beam current and rise time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337794
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  • 3
    Electronic Resource
    Electronic Resource
    Blue light-regulation of cell division in Adiantum protonemata: kinetic properties of the photosystem (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Blue-light-induced cell division in single-celled Adiantum protonemata was studied by using two or three pulses (pulse duration: 30 s) separated by various periods and by using relatively long irradiation (e.g. 30 min). The results showed: (1) that the response is saturated by a single pulse, (2) that after the application of a saturating pulse, the protonemata gradually become responsive to another pulse, showing time-dependent saturation to the second pulse, and (3) that although reciprocity holds in the pulse-induced response, it becomes invalid as the exposure duration extends in the range of minutes. These results were analysed in view of a reaction model in which a molecular component is considered to exist in two forms A and B. The response to a single pulse is considered to result from a light-dependent conversion of the component (A→B), and the restoration response measured by two pulses, from its dark reversion (B→A). The analyses yielded (1) the value of the constant which relates the fluence rate to the rate constant of the light-induced reaction, and (2) the rate constant of the dark reaction. The model was extended to formulate the responses to long irradiations as a function of the integrated concentration of B over time. The responses predicted by the formula by using the parameter values estimated from the pulse responses were able to explain the responses measured for long irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1988.tb01794.x
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  • 4
    Electronic Resource
    Electronic Resource
    Blue light-regulation of cell division in Adiantum protonemata: an approach with pulse stimulation (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Cell division of the single-celled Adiantum protonemata produced by red-light (RL) incubation of germinated spores is induced by transfer to darkness and is stimulated by blue light (BL). It is known that the cellular process leading to this cell division includes one cell cycle and the BL response results from shortening of the Gl phase. The authors studied this BL regulation of cell cycle by giving a pulse of BL after RL termination and measuring changes in the proportion of divided cells. To minimize phytochrome responses arising from BL irradiation, the plants were kept in continuous far-red light instead of total darkness after the RL incubation. The response to a pulse (10–100 s) approached saturation with increasing rluences in a manner that reciprocity is valid. The sensitivity to BL, investigated by measuring the response to a saturating pulse, showed an increase in the first several hours after RL termination, followed by a sustained sensitivity for 20 h. Time courses of the pulse-induced responses showed a lag of about 12 h, which was considerably shorter than in the non-stimulated control; the lag was approximately independent of the strength of BL stimulation or the timing of BL application after RL termination, and the major difference occurred in the slope. It is concluded that the sensitivity to BL is retained during the time span in which the dark-dependent Gl phase progresses, and that the BL response is initiated independently of the reactions involved in the dark-dependent Gl phase. A minimal reaction model of Gl phase is suggested to unify the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1988.tb01793.x
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  • 5
    Electronic Resource
    Electronic Resource
    Tracer study on a paracellular route in experimental hydrocephalus (1985)
    Springer
    Acta neuropathologica 65 (1985), S. 247-254 
    Details
    ISSN: 1432-0533
    Keywords: Hydrocephalus ; Blood brain barrier ; Tight junction ; Paracellular pathway ; Ionic lanthanum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Considering the possibility of a paracellular pathway for edema resoltuion, we studied the intracerebral movement of proteins and ionic lanthanum in rats with experimental hydrocephalus. Hydrocephalus was induced by injection of kaolin suspension into the cisterna magna. After induction of hydrocephalus, horseradish peroxidase (HRP), microperoxidase (MP), or lanthanum chloride (LaCl3) were perfused into the ventricle system. HRP and MP were localized mainly in the intercellular spaces between ependymal cells, glial cells, and in perivascular spaces and were restricted by endothelial tight junctions. Ionic lanthanum (La3+), however, penetrated these tight junctions and moved between the blood and CSF cavities by paracellular pathways. These findings indicate that in obstructive hydrocephalus, the tight junctions may constitute part of a paracellular pathway for the transendothelial movement of small solutes, although they prevent the movement of larger molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687004
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  • 6
    Electronic Resource
    Electronic Resource
    Immunohistochemical characterization of oligodendrogliomas: an analysis of multiple markers (1986)
    Springer
    Acta neuropathologica 72 (1986), S. 15-22 
    Details
    ISSN: 1432-0533
    Keywords: Oligodendroglioma ; Cell markers ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty-eight oligodendrogliomas and seven oligoastrocytomas were immunotested by the peroxidase-antiperoxidase (PAP) method with antiglial fibrillary acidic protein (GFAP) serum, anti-Leu 7 monoclonal antibody (Mab), anti-myelin-associated glycoprotein (MAG) Mab, anti-myelin basic protein (MBP) serum, anti-carbonic anhydrase C (CA C) serum and anti-neuron-specific enolase (NSE) serum. The immunoreactivity of their vascular pattern was studied withUlex europaeus type I lectin (UEA I). According to their morphology and distribution GFAP-positive cells were respectively interpreted as reactive astrocytes, neoplastic astrocytes and neoplastic oligodendrocytes. Reactive astrocytes were found in the tumor, around the tumor and surrounding the supporting blood vessels. Neoplastic astrocytes were mainly found in the oligoastrocytomas and usually closely intermingled with neoplastic oligodendrocytes. GFAP-positive neoplastic oligodendrocytes were found in the typical oligodendrogliomatous areas. They had central nuclei and GFA positivity was mainly found in the perinuclear cytoplasm. They correspond to the “gliofibrillary oligodendrocytes” described by Herpers and Budka [11]. Of the oligodendrogliomas 91% displayed Leu 7 positivity, but anti-Leu 7 cannot be considered as a specific marker for oligodendrogliomas since other neuroepithelial tumors have been reported to react with this antibody [20]. MAG-, CA C- and NSE-positivities were found in a number of tumor cells in a few oligodendrogliomas. All the tumor cells were MBP-negative, but myelin sheaths and fragments of myelin in the infiltrated white matter were clearly demonstrated by this antiserum. UEA I strikingly demonstrated the vascular pattern of the tumors, and its usefulness as a discriminating marker for the supportive endothelial cells was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687942
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  • 7
    Electronic Resource
    Electronic Resource
    Expression of epithelial membrane antigen in perineurial cells and their derivatives (1987)
    Springer
    Acta neuropathologica 75 (1987), S. 160-165 
    Details
    ISSN: 1432-0533
    Keywords: Epithelial membrane antigen ; Pacinian corpuscles ; Perineurial cells ; Perineurioma ; Neurothekeoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Paraffin-embedded surgical pathology specimens from skin (5) and muscle (2) biopsies, from Morton's neuromas (3), traumatic neuromas (8), schwannomas (21), neurofibromas (12), and from one perineurioma and one neurothekeoma were studied by immunoperoxidase histochemistry and antibodies against epithelial membrane antigen (EMA), Leu 7 epitopes (Leu 7), S-100 protein (S-100) and cytokeratins. Normal, reactive and neoplastic perineurial cells stain consistently for EMA, whereas Schwann cells express Leu 7 and/or S-100 positivity. None of the immunoreactive cells stained for cytokeratin. Our findings indicate that perineurial and Schwann cells can easily be distinguished by their different patterns of immunoreactivity with the above markers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687077
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  • 8
    Electronic Resource
    Electronic Resource
    Discovery of the short γ -ray burst GRB 050709 (2005)
    [s.l.] : Nature Publishing Group
    Nature 437 (2005), S. 855-858 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Gamma-ray bursts (GRBs) fall into two classes: short-hard and long-soft bursts. The latter are now known to have X-ray and optical afterglows, to occur at cosmological distances in star-forming galaxies, and to be associated with the explosion of massive stars. In contrast, the distance scale, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04213
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