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  • 1
    Digitale Medien
    Digitale Medien
    Perpendicular magnetic anisotropy in Pt/Fe multilayers : 35th annual conference on magentism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5658-5660 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Perpendicular magnetic anisotropy (K⊥) and related magnetic properties in Pt/Fe multilayers [compositionally modulated multilayer films (CMFs)] are investigated. It is found that Pt/Fe CMFs with about an 18-A(ring) Pt layer and Fe layer below 5 A(ring) become perpendicularly magnetized films. Surface magnetic anisotropy (Ks) and volume anisotropy (Kv) are 0.46 erg/cm2 and about − 2 × 107 erg/cm3 at room temperature, respectively. The Ks is almost equivalent to that of Pt/Co CMFs and increases with decreasing temperature. The absolute value of Kv, however, is much larger than that of the Pt/Co system. The effective magnetic anisotropy (K⊥ eff) of [Fe(4.7 A(ring))/Pt(18.5 A(ring))]80 CMF changes from positive to negative at T(approximately-equal-to)200 K with decreasing temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347927
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  • 2
    Digitale Medien
    Digitale Medien
    Raman scattering from LO phonon-plasmon coupled modes in gallium nitride (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1098-1101 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Raman spectra of n-type gallium nitride with different carrier concentrations have been measured. The LO phonon band shifted towards the high-frequency side and broadened with an increase in carrier concentration. Results showed that the LO phonon was coupled to the overdamped plasmon in gallium nitride. The carrier concentrations and damping constants were determined by line-shape fitting of the coupled modes and compared to values obtained from Hall measurements. The carrier concentrations obtained from the two methods agree well. As a result, the dominant scattering mechanisms in gallium nitride are deformation-potential and electro-optic mechanisms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356492
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of substituted elements into the Cr layer on a CoNiCr/Cr sputtered hard disk (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 7507-7509 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A study was made on the effects of elements substituted into the Cr layer on a CoNiCr/Cr sputtered hard disk. Among the various elements tried, Si, Gd, Ce, and Cu were found to increase the coercive force in the film. For Si and Gd, alloy targets of Cr-Si and Cr-Gd were prepared, and the deposited films indicated an increase of the coercive force by about 150 Oe over those without Si or Gd element.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345810
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  • 4
    Digitale Medien
    Digitale Medien
    Magnesium formate-urea (1/2) (1992)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 793-795 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270191012301
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  • 5
    Digitale Medien
    Digitale Medien
    [(C5H5N)2H]3[PW12O40] (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 231-233 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S010827019300825X
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  • 6
    Digitale Medien
    Digitale Medien
    Cd(2,2'-bipyridine-N,N')Ni(CN)4, a highly bent close two-dimensional network of [Cd-{(NC)Ni1/4}4]n (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 496-498 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270193011126
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  • 7
    Digitale Medien
    Digitale Medien
    Genetic changes in atypical hyperplasia and lymphoma with angioimmunoblastic lymphadenopathy and dysproteinaemia in the same patients (1994)
    Springer
    Virchows Archiv 425 (1994), S. 25-32 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Angioimmunoblastic lymphadenopathy with dysproteinaemia ; Polymerase chain reaction ; T-cell receptor gene
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The transition between atypical hyperplasia and lymphoma with angioimmunoblastic lymphadenopathy and dysproteinaemia (AILD) was studied in serial lymp node biopsy specimens from five patients using DNA analysis with Southern blot analysis, polymerase chain reaction, chromosomal analysis, and immunophenotyping. The chromosomal analysis showed additional abnormalities as the disease progressed to those present initially, and immunological staining showed a corresponding increase in the numbers of CD4- and Ki67-positive cells. In the first biopsy from each patient a diagnosis of atypical hyperplasia with AILD was made and lymphoma excluding by the finding of only a few atypical lymphoid cells and the preservation of follicles with germinal centres. DNA analysis of lymph nodes at this stage showed either germ lines or oligoclonal rearrangements of the T-cell receptor (TCR) and immunoglobulin heavy chain genes. In the final biopsy, when a diagnosis of lymphoma with AILD was made, either a monoclonal rearrangement of the TCR was observed or one of the rearranged bands had increased in density. These results suggest selective proliferation of a clone of abnormal cells may account for the progression of atypical hyperplasia to lymphoma with AILD.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00193945
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  • 8
    Digitale Medien
    Digitale Medien
    Effects of hyperglycaemia on sorbitol and myo-inositol contents of cultured embryos: treatment with aldose reductase inhibitor and myo-inositol supplementation (1990)
    Springer
    Diabetologia 33 (1990), S. 597-602 
    Details
    ISSN: 1432-0428
    Schlagwort(e): Hyperglycaemia ; embryogenesis ; rat embryo culture ; malformation ; sorbitol ; myo-inositol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary To demonstrate the myo-inositol depletion hypothesis in hyperglycaemia-induced embryopathy, rat conceptuses of 9.5 days of gestation in the early head-fold stage were grown in vitro during neural tube formation for 48 h with increasing amounts of glucose. The effects of an aldose reductase inhibitor and the myo-inositol supplementation were also investigated. Sorbitol and myo-inositol contents were measured in separated embryos and extra-embryonic membranes including yolk sac and amnion at the end of culture. After addition of 33.3 mmol/l and 66.7 mmol/l glucose to the culture media, the myo-inositol content of the embryos was significantly decreased by 43.1% (p〈0.05) and 64.6% (p 〈 0.01) of the control group, while a marked accumulation of sorbitol was observed (25 and 41 times that of the control). Although the addition of an aldose reductase inhibitor (0.7 mmol/l) to the hyperglycaemic culture media containing an additional 66.7 mmol/l glucose significantly reduced the sorbitol content of embryos to approximately one-eighth, the myo-inositol content of embryos remained decreased and the frequency of neural lesions was unchanged (23.1% vs 23.9%, NS). Supplementation of the myo-inositol (0.28 mmol/l) completely restored the myo-inositol content of the embryos and resulted in a significant decrease in the frequency of neural lesions (7.1% vs 23.9%, p 〈 0.01) and a significant increase in crown-rump length and somite numbers. Much less significantly, sorbitol accumulation was also observed in the extra-embryonic membrane in response to hyperglycaemia, neither hyperglycaemia nor the myo-inositol supplementation modified the myo-inositol contents of the extra-embryonic membrane. We conclude that the mechanism of hyperglycaemia-induced teratogenicity was mediated by the myo-inositol depletion of the embryo at a critical stage of organogenesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00400203
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  • 9
    Digitale Medien
    Digitale Medien
    Suppression of pulmonary granulomatous inflammation by immunomodulating agents (1992)
    Springer
    Inflammation research 37 (1992), S. 99-106 
    Details
    ISSN: 1420-908X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We demonstrated previously that macrophages and macrophage-derived cytokines including lymphocyteactivating factors (LAFs) play a critical role in lung granuloma formation in mice and that granulomas sizes correlated with LAF activity in the lesions. In the present study, we examined the effects ofd-penicillamine (d-Pc), 2-acetylthiomethyl-3-(4-methyl-benzoyl)propionic acid (KE-298) and dexamethasone (Dex) on dextran bead-induced lung granulomas in mice. KE-298 is a newly synthesized compound containing sulfur (S) similar tod-Pc. Large granulomas developed, which reached peak intensity within 3 days and declined in size thereafter. Aqueous lung extracts of the mice contained high levels of LAF that were correlated with granuloma sizes. The lesions and local LAF activity were inhibited by administration of these agents. The most potent inhibitor was Dex. The suppressive effect of KE-298 was similar to that ofd-Pc. These results suggest that suppression of granulomas may be attributed to inhibition of LAF activity/synthesis by these agents.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01987896
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  • 10
    Digitale Medien
    Digitale Medien
    Magnetic resonance imaging of ganglion cell tumours (1993)
    Springer
    Neuroradiology 35 (1993), S. 181-184 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Magnetic resonance imaging ; Lhermitte-Duclos disease ; Ganglioglioma ; Gd-DTPA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The MRI and CT studies of four patients with ganglion cell tumours, one with a cerebellar gangliocytoma (Lhermitte-Duclos disease), and three with gangliogliomas are reported. MRI in Lhermitte-Duclos disease clearly demonstrated a mass of low signal intensity in the left cerebellum on T1-weighted spin-echo (SE) images and an area of high signal intensity with a blurred margin on T2-weighted SE images. These MRI studies were useful for delineating the lesion, which was verified at surgery. In the ganglioglioma, MRI demonstrated two isointense solid masses on T1-weighted SE images, which enhanced clearly with Gd-DTPA. The enhancement study was advantageous in planning surgery.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00588488
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