Search Results - (Author, Cooperation:Usadel)

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  1. 1
    Staff View
    ISSN:
    1432-1440
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01773709

    Articles: DFG German National Licenses
  2. 2
    Nowak, U. ; Misra, A. ; Usadel, K. D.

    [S.l.] : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Monte Carlo simulations of a system consisting of a ferromagnetic layer exchange coupled to a diluted antiferromagnetic layer described by a classical spin model show a strong dependence of the exchange bias on the degree of dilution in agreement with recent experimental observations on Co/CoO bilayers. These simulations reveal that diluting the antiferromagnet leads to the formation of domains in the volume of the antiferromagnet carrying a remanent surplus magnetization which causes and controls exchange bias. To further support this domain state model for exchange bias we study, in the present article, the dependence of the bias field on the thickness of the antiferromagnetic layer. It is shown that the bias field strongly increases with increasing film thickness and eventually goes over a maximum before it levels out for large thicknesses. These findings are in full agreement with experiments. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1358829

    Articles: DFG German National Licenses
  3. 3
    Moschel, A. ; Usadel, K. D.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The magnetization of thin films depends in a very sensitive way on surface anisotropy fields which often favor a perpendicular orientation and on the dipole interaction which favors an in-plane magnetization. A temperature driven transition from one to the other orientation has been observed experimentally. In order to understand this behavior theoretically we performed detailed calculations of the magnetization of very thin films (thickness of up to 5 layers) within a quantum mechanical mean field approach. A surface anisotropy that favors a perpendicular orientation and a long range dipole interaction were taken into account. It is shown that these competing interactions for certain values of the parameters may result in a temperature driven switching transition from an out-of plane to an in-plane ordered state. Varying the strength of the dipole interaction we found that the switching temperature is a very sensitive function of the ratio of these two competing interactions. A perpendicular ground state magnetization of the film is only found for values of the surface anisotropy which are larger than a critical surface anisotropy value. The reorientation of the magnetization vector has its physical origin in an entropy increase of the system when going from a perpendicular to an in-plane ordered state.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.358193

    Articles: DFG German National Licenses
  4. 4
    Badenhoop, K. ; Schwarz, G. ; Bingley, P. ; Trowsdale, J. ; Usadel, K. H. ; Gale, E. A. M. ; Bottazzo, G. F.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1989
    Staff View
    ISSN:
    1744-313X
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Medicine
    Notes:
    The localization of TNF genes on the short arm of chromosome 6 between HLA B and the complement genes focused attention to that genetic region which harbours many immunologically relevant genes and is also thought to hold susceptibility genes for a variety of autoimmune diseases that are linked to specific alleles of particular loci in the HLA D region. Since the recently established HLA-DR-DQ variation accounts only for part of the genetic susceptibility to insulin-dependent diabetes mellitus (IDDM) we searched for genomic variation of the tumour necrosis factor (TNF) alpha. We have identified a TNF-alpha restriction fragment length polymorphism (RFLP) with N coI and analysed diabetic patients including their families, controls and homozygous typing cell lines (HTC) defined by the 10th International Histocompatibility Workshop. Segregation analysis in families and HTC results show a strong linkage of the TNF-alpha 5.5 kb allele with DR types in particular with AIB8DR3. This tight linkage of TNF-alpha alleles with extended haplotypes and the significant increase of heterozygotes in patients could lead to some explanation of the DR3 association with a variety of autoimmune diseases particularly IDDM.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1744-313X.1989.tb00494.x

    Articles: DFG German National Licenses
  5. 5
    Rau, H. ; Usadel, K.H. ; Ommert, S. ; Badenhoop, K.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1995
    Staff View
    ISSN:
    1744-313X
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Medicine
    Notes:
    The polymorphism of the LST-1 gene (the human homologue of the mouse B144 gene) can be identified by Pvu II restriction enzyme digestion. We investigated the contribution of this RFLP to disease susceptibility in 117 patients with type I diabetes mellitus (IDDM), 110 with Graves’ disease (GD) and 93 healthy controls. The distribution of the different LST-1 alleles (LST-1*1:1323bp, LST-1*2:610bp/713) was similar among IDDM and GD patients as well as in controls. The combination of DQA1*0501, DQB1*0201 and DQB1*0301, all predisposing to endocrine autoimmune disease, with LST-1*1 or LST-1*2 was not increased in patients. Analysis of two informative families with IDDM demonstrated cosegregation of DQA1 and DQB1 alleles with LST-1 alleles. No association of LST-1 polymorphisms with IDDM nor GD could be demonstrated.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1744-313X.1995.tb00242.x

    Articles: DFG German National Licenses
  6. 6
    Braden, B. ; Enghofer, M. ; Schaub, M. ; Usadel, K.-H. ; Caspary, W. F. ; Lembcke, B.

    Oxford UK : Blackwell Science Ltd
    Published 2002
    Staff View
    ISSN:
    1365-2036
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    In patients with diabetic gastroparesis, delayed food delivery to the intestine may become a major obstacle to post-prandial glycaemic control.〈section xml:id="abs1-2"〉〈title type="main"〉Aim:To investigate whether cisapride accelerates gastric emptying in the long term or improves diabetes control in patients with diabetic gastroparesis.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:Eighty-five patients with long-standing insulin-dependent diabetes mellitus (glycosylated haemoglobin (HbA1c) 〉 7.0%), dyspepsia and diabetic neuropathy were tested for impaired gastric emptying of solids by the 13C-octanoate breath test. Nineteen of these patients with severe diabetic gastroparesis (i.e. t1/2 〉 170 min) were randomly treated with 10 mg cisapride t.d.s. (n=9) or placebo (n=10) for 12 months. Thereafter, the breath test, dyspeptic symptoms and HbA1c values were reassessed.〈section xml:id="abs1-4"〉〈title type="main"〉Results:Half emptying times in nine patients with diabetic gastroparesis were significantly shortened by cisapride (175 ± 46 min vs. 227 ± 40 min; P 〈 0.03). Half emptying times in the 10 patients taking placebo did not change (205 ± 37 min vs. 211 ± 36 min, P=0.54). Cisapride significantly reduced dyspepsia (score: 4.1 ± 1.6 vs. 2.0 ± 0.5, P=0.002). HbA1c values after 12 months of treatment were not different (cisapride: 7.7 ± 0.4% vs. 7.6 ± 0.9%, P=0.76; placebo: 7.5 ± 0.6% vs. 7.6 ± 1.5%, P=0.89).〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions:Prokinetic treatment with cisapride accelerates gastric emptying of solids and improves dyspeptic symptoms in diabetic gastroparesis. Glycaemic control, however, is not affected by cisapride.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-2036.2002.01257.x

    Articles: DFG German National Licenses
  7. 7
    Buttner, G. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4526(90)90496-H

    Articles: DFG German National Licenses
  8. 8
    Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0920-5632
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0920-5632(88)90020-5

    Articles: DFG German National Licenses
  9. 9
    Gerber, H.J. ; Usadel, K.D. ; Brieskorn, G.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4526(89)90123-3

    Articles: DFG German National Licenses
  10. 10
    Nowak, U. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4526(90)90497-I

    Articles: DFG German National Licenses
  11. 11
    Buttner, G. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0921-4526(90)80954-H

    Articles: DFG German National Licenses
  12. 12
    Nieschlag, E. ; Usadel, K.H. ; Kley, H.K.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0022-4731
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0022-4731(75)90184-3

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    0039-128X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Medicine
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0039-128X(75)90094-X

    Articles: DFG German National Licenses
  14. 14
    Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0038-1098
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0038-1098(86)90234-6

    Articles: DFG German National Licenses
  15. 15
    Usadel, K.D. ; Schmitz, B.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0038-1098
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0038-1098(87)90575-8

    Articles: DFG German National Licenses
  16. 16
    Fischer, G. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0038-1098
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0038-1098(71)90265-1

    Articles: DFG German National Licenses
  17. 17
    Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0038-1098
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0038-1098(72)90775-2

    Articles: DFG German National Licenses
  18. 18
    Nowak, U. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0378-4371
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0378-4371(92)90528-X

    Articles: DFG German National Licenses
  19. 19
    Nowak, U. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0921-4526(90)80955-I

    Articles: DFG German National Licenses
  20. 20
    Buttner, G. ; Kopec, T.K. ; Usadel, K.D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0375-9601
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0375-9601(90)90423-L

    Articles: DFG German National Licenses