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  • 1995-1999  (3)
  • 1905-1909
  • 1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6838-6842 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the role of thallium as a surfactant in the growth of InAs on GaAs(001) by molecular beam epitaxy. Thallium suppresses the transition from two-dimensional to three-dimensional growth modes for temperatures below 440 °C without incorporating significantly into the bulk InAs lattice. It extends the range of temperatures at which InAs may be grown, and appears to improve the crystalline quality of growth at 520 °C. Preliminary results indicate that at low temperature (280 °C) thallium does not prolong pseudomorphic growth beyond the normal critical layer thickness, but rather may form interfacial InTlAs with a greater concentration of thallium than has been achieved to date. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-6903
    Keywords: Prothrombin ; ELISA ; cerebrospinal fluid ; blood-CSF barrier ; Alzheimer ; neurological disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Prothrombin, known to be expressed in brain and to possess growth modulating properties, has been suggested to be involved in the pathogenesis of Alzheimer's disease (AD). We studied prothrombin concentration in lumbar CSF (L-CSF) in patients with AD (n = 25), neurologic disease controls (NDC; n = 33) covering a wide range of neurologic disorders, and subjects with Guillain-Barré syndrome (GBS; n = 4) as well as in samples of non-pathological ventricular CSF (V-CSF; n = 4). The results were evaluated with respect to CSF flow rate, as indicated by the albumin quotient (QAlb). The concentrations of prothrombin in L-CSF in NDC (mean: 0.46 mg/l, range: 0.21–0.96), and AD (mean: 0.6 mg/l, range: 0.19–1.2) were in the normal range reported previously. Expectedly, prothrombin concentration in L-CSF of GBS was increased (mean: 6.3 mg/l, range: 2.3–9.7) corresponding to the increased QAlb in this group (mean 54.6 × 10−3, range: 17–88.1). The concentrations of both prothrombin and albumin were 5.5-fold higher in L-CSF than in V-CSF (mean QAlb : 1.1 × 10−3, mean concentration of prothrombin: 0.088 mg/l). In conclusion, CSF prothrombin in all conditions evaluated here is exclusively derived from blood.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1437-2320
    Keywords: Key words Pituitary apoplexy ; Spontaneous hemorrhage ; Fatal course ; Literature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  A rare fatal course of a spontaneous pituitary apoplexy is described and its histological and pathophysiological causes are discussed. A review of the literature gives an overview of the historical and epidemiological data.
    Type of Medium: Electronic Resource
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