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  • 1
    Digitale Medien
    Digitale Medien
    Epitaxial lutetium silicide: Growth, characterization and electrical properties (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 948-952 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The growth of lutetium silicide layers on 〈100〉 and 〈111〉Si is studied by random and channeling Rutherford backscattering spectrometry, x-ray diffractometry, and scanning electron microscopy. The LuSi2−x layers grow epitaxially with a better crystallinity on 〈100〉Si than on 〈111〉Si by vacuum annealing at 400 °C. Silicidation of Lu layers proceeds via nonuniform spatial diffusion of silicon atoms leading to a columnar growth of the silicide layer. Resistivity measurements in the temperature range 4.6–300 K show that LuSi2−x layers are metallic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351771
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  • 2
    Digitale Medien
    Digitale Medien
    Diffusion marker experiments with rare-earth silicides: The case of lutetium silicide (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7620-7622 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A marker study of the lutetium silicide prepared by vacuum furnace annealing of a Lu thin layer on Si substrate shows that Si atoms are the dominant diffusing species during the formation of LuSi2−x. Rutherford backscattering spectrometry is used to determine the position of the marker before and after the annealing. The silicide films are characterized by x-ray diffraction and scanning electron microscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349719
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  • 3
    Digitale Medien
    Digitale Medien
    UPd2Al3 singlet-ground-state magnetism in a heavy-fermion superconductor : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5421-5423 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Analysis of the leading nonlinear term of the susceptibility χ3(T) of the singlet-ground-state heavy-fermion superconductor UPd2Al3 shows evidence for a jump at TN and a "third-order'' Curie–Weiss type behavior at higher temperatures, inferring quadrupolar or magnetoelastic interactions. These effects are closely related to quadrupolar correlations observed in measurements of the nonlinear susceptibility and calculated in a crystal-electric-field approach for the singlet-ground-state systems URu2Si2 and PrNi5 .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353702
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  • 4
    Digitale Medien
    Digitale Medien
    A new centrifuge pellet injector for fusion experiments (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 983-989 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: This paper reports on the new pellet injection system for refueling the ASDEX Upgrade tokamak with cubic H2 or D2 pellets having alternative side lengths of 1.5, 1.75, and 2.0 mm and optional Ne doping. The system delivers series of about 100 pellets at a maximum repetition rate of more than 40 Hz. The pellets are accelerated by means of a centrifuge with an optimized straight acceleration arm. This configuration minimizes the compulsive force acting on the pellet during the acceleration process. Since this also minimizes stresses inside the pellet, high velocities—a maximum of 1211 m/s being achieved—are possible without destroying the hydrogen cubes. A special pellet feed-in technique based on a static stop cylinder interrupting the acceleration path successfully reduced the horizontal scattering angle to values of less than ±4°; a high efficiency, with more than 90% of the pellets arriving within the acceptance angle, was thus achieved. The whole system was found to work very reliably and reproducibly during the whole test operation period, covering about 105 pellet shots, and is now being integrated into the ASDEX upgrade experiment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144101
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  • 5
    Digitale Medien
    Digitale Medien
    Formation of monolithic masks for 0.25 μm x-ray lithography (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3105-3107 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have constructed monolithic masks for proximity x-ray lithography by forming 1 μm thick polycrystalline Si membranes directly on glass support frames. Finished masks are 78 mm in diameter and ∼5 mm thick, with the Si membrane spanning 27 mm. The monolithic design provides simple processing and unprecedented flatness of 30 nm across the membrane and 〈500 nm across the entire disk. Mask blanks were metallized with 500 nm of W that was sputter deposited under conditions that hold the film stress 〈50 MPa. Tungsten was patterned by reactive ion etching to form features as small as 0.25 μm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105778
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  • 6
    Digitale Medien
    Digitale Medien
    Synthetic glucocorticoids potentiate IgE synthesis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 49 (1994), S. 0 
    Details
    ISSN: 1398-9995
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Recently, hydrocortisone (HC) has been shown significantly to enhance interleukin-4 (IL-4)-induced in vitro IgE synthesis. For investigation of possible effects of synthetic corticosteroids but also of effects of other important human hormones, peripheral blood mononuclear cells (PBMC) were incubated with IL-4 and various concentrations of the hormones. IgE secreted in the supernatant was determined after a 14-d culture period. Like HC, all synthetic corticosteroids potentiated IgE secretion. A minor effect was noted for the mineralocorticoid aldosterone. No modulating effect on IL-4-induced IgE formation was observed for adrenocorticotropic hormone (ACTH), somatotropin (STH), thyroid-stimulating hormone (TSH), triiodothyronine, thyroxine, epinephrine, noradrenaline, insulin, and glue agon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1398-9995.1994.tb02283.x
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  • 7
    Digitale Medien
    Digitale Medien
    Pressure Stability of Proteins (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 44 (1993), S. 89-113 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pc.44.100193.000513
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  • 8
    Digitale Medien
    Digitale Medien
    Whither Biophysics? (1990)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biophysics and Biomolecular Structure 19 (1990), S. 1-8 
    Details
    ISSN: 0084-6589
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.bb.19.060190.000245
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  • 9
    Digitale Medien
    Digitale Medien
    Interactions between Erysiphe graminis and Septoria nodorum on wheat (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 43 (1994), S. 0 
    Details
    ISSN: 1365-3059
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Interactions between Erysiphe graminis f.sp. tritici and Septoria nodorum on wheat were studied in the greenhouse and in a 2-year field experiment using artificial inoculation. The integrated form of the logistic growth model dy/dt = ry (1 -y/K), with infection rate r and final accumulated disease K, was fitted to the disease progress data. Septoria nodorum substantially reduced the disease severities of E. graminis, and caused significant reductions of at least 60% in final accumulated disease K of E. graminis. In the field trials, E. graminis increased the final accumulated disease K of S. nodorum. Owing to the extremely low severity of E. graminis, the increase of S. nodorum severity was small, and significance was given in one of the two years only, with an increase in K of roughly 30%. In the pot experiment, final accumulated disease K of S. nodorum remained unchanged, but there was a significant 30% increase in the infection rate r of S. nodorum. The difference between field and pot trials was explained by the climatic conditions in the greenhouse which excluded secondary infections of 5. nodorum, and which are important factors for disease progress in the field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3059.1994.tb00565.x
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  • 10
    Digitale Medien
    Digitale Medien
    In vitro and in vivo effect of glucocorticoids on IgE and IgG subclass secretion (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 24 (1994), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Hydrocortisone (HC) as well as its synthetic derivatives have been shown to strongly enhance interleukin-4 (IL-4)-induced in vitro IgE synthesis. To investigate possible effects on IgG subclasses, peripheral blood mononuclear cells (PBMC) were incubated with different glucocorticosteroids in the absence or presence of IL-4. The glucocorticoids alone led to a strongly enhanced secretion of IgG 1, IgG2 and IgG3, but not IgG4. The addition of IL-4 induced marked increases in IgG1 and IgG4, no changes in IgG3, but a consistent decrease in IgG2 synthesis. In order to find out whether these profound in vitro effects of corticosteroids are also reflected by changes in antibody serum levels during steroid treatment, 10 healthy volunteers took 25 mg prednisone for 7 consecutive days. We could not observe any significant changes of IgE or IgG subclass serum levels during or after this period. However, cell cultures performed after the glucocorticoid treatment revealed a marked decrease in the ability to produce IgG4 and a significantly lower potential to produce IgE in response to IL-4 alone or IL-4 and HC. We conclude that, although strongly implicated by the in vitro results, glucocorticosteroid treatment does not result in an increased allergy risk.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1994.tb02738.x
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