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  • Articles: DFG German National Licenses  (20)
  • 2000-2004  (13)
  • 1975-1979  (5)
  • 1930-1934  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Collisional effects on spectral line shape from the Doppler to the collisional regime: A rigorous test of a unified model (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 158-166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The paper presents high resolution Raman investigations of the Q(1) line of H2 in Ar mixture from low density (Doppler regime) to high density (collisional regime) analyzed with a unique line shape profile. Measurements are performed by stimulated Raman gain spectroscopy between 300 and 1000 K in a wide density range (from 0.2 to 11 amagat). All the observed spectral features are accurately described by a unified model recently proposed by two of the authors. This model accounts for a velocity-memory process, not restricted to the usual hard and soft limits. It also includes correlation between velocity- and phase-changing collisions. An exhaustive analysis of various possible mechanisms on the line shape is achieved. These mechanisms are the Dicke narrowing, the radiator speed dependence of the collisional broadening and shifting parameters, the collisionally induced speed-class exchange and the nonimpact effect. The present test shows the high consistency of the unified model, since it allows one to get a remarkable agreement with all the data by using a unique set of parameters. This model should be useful for optical diagnostics at moderate density, as required for combusting media or atmospheric work. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480570
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Speed-dependent line profile: A test of a unified model from the Doppler to the collisional regime for molecule–molecule collisions (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4951-4956 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A speed-dependent line profile combining soft and hard fully correlated Dicke-narrowing collisions was recently successfully tested on Ar-broadened H2 spectra in a wide density and temperature range. A further test for mixtures of H2 in nitrogen molecules (instead of Ar atoms) is presented. This test is also based on high resolution Raman investigation of the isotropic Q(1) line of H2 from low to high density at various temperatures. The same consistency of the speed-dependent line profile as for H2–Ar is obtained for H2–N2 through a remarkable agreement with all the data by using a unique set of four parameters (the collisional width and shift, the kinetic frequency, and a characteristic velocity memory parameter). The present study is a preliminary step for the hydrogen CARS thermometry in H2–air flames at high pressure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287824
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Small-angle X-ray studies of the scaffold in bacteriophage λ head formation (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 496-497 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The pathway of bacteriophage λ head formation has been well characterized in vivo and in vitro (Hohn, Katsura & Hohn, 1977). First a petit λ particle consisting of a shell protein pE, a protein pNu3 and minor proteins, but lacking DNA, is formed. The pNu3-containing structure is then converted to a structure which does not contain pNu3, and which is capable of taking up and cutting the viral DNA. The purpose of this work is to determine the scaffold structure, formed by pNu3, by small-angle scattering techniques based on the known physico-chemical properties of pNu3-containing and pNu3-lacking particles (Künzler & Hohn, 1978). The scaffold is found to be inside the protein shell but less concentrated than the 130 Å radius core reported from electron micrographs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013710
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    Paper (German National Licenses)
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  • 4
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    Burrow, T., and S. Bhattacharya: The Pengo Language (Book Review) (1975)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 70:4 (1975:Juli/Aug.) 403 
    Details
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1975-070-04-000004
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  • 5
    facet.materialart.
    Unknown
    Pfeiffer, M.: Elements of Kurux historical Phonology (Book Review) (1977)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 72:5 (1977:Sept./Okt.) 520 
    Details
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1977-072-05-000024
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  • 6
    facet.materialart.
    Unknown
    Rabotschaja kniga soziologa. Redkollegija: G. W. Ossipow (otwetstwenny redaktor) (Book Review) (1977)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 25:10 (1977) 1290 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    Description / Table of Contents: REZENSIONEN
    Notes: Zum 60. Jahrestag der Grossen Sozialistischen Oktoberrevolution
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1977-025-10-000020
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  • 7
    Electronic Resource
    Electronic Resource
    Lichtmikroskopische befunde zur neubildung elastischer fasern im basaliomstroma (1975)
    Springer
    Archives of dermatological research 252 (1975), S. 119-130 
    Details
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An einem auslesefreien Material von 275 Basaliomexcidaten wurde die Neubildung elastischer Fasern im Basaliomstroma mit Hilfe der Elastica-Färbungen (Orcein, Resorcin-Fuchsin) histologisch untersucht. In nahezu einem Drittel der Basaliome konnten neugebildete elastische Fasern im Stroma beobachtet werden. An Stellen, an denen eine Neubildung elastischer Fasern nachweisbar war, fanden sich ungewöhnlich zahlreich Fibroblasten und Mastzellen (Toluidin-Blaufärbung). Offensichtlich kommt es unter dem Einfluß des auswachsenden Basaliomstranges im Sinne einer dermo-epidermalen Interaktion 1. zu Mastzellvermehrung 2. zur Fibroblastenstimulierung 3. zur Neubildung elastischer Fasern. Die Beobachtungen legen den Schluß nahe, daß zwischen den genannten Befunden eine Wechselwirkung besteht. Als Folge der dermo-epidermalen Interaktion können die Fibroblasten (auch der Altershaut!) im Basaliomstroma so weit stimuliert werden, daß sie erneut die Fähigkeit erlangen, elastische Fasern zu bilden — eine Funktion, die sonst üblicherweise mit zunehmendem Alter weitgehend eingeschränkt ist. Die Befunde scheinen von Bedeutung unter dem Aspekt der “Verjüngung” menschlicher Altershaut — sie sind bisher jedoch nur von rein theoretischem Interesse.
    Notes: Summary From 275 specimens of all sorts of basal cell epitheliomas the new formation of elastic fibers was histologically investigated by means of selective elastic tissue stains such as orcein and resorcinfuchsin. In nearly one third of the basal cell epitheliomas newly formed elastic fibers could be observed in the stroma. In places where a new formation of elastic fibers was demonstrated fibroblasts and mast cells (toluidine blue stain) were unusually numerous. Apparently the influence of the growing tumor masses of basal cell epitheliomas leads to a dermo-epidermal interaction in the form of 1. increase of mast cells 2. stimulation of fibroblasts 3. new formation of elastic fibers. The observation suggest that there exists a relationship between the above noted findings. Due to the dermo-epithelial interaction (even in senile skin) in the stroma of basal cell epithelioma fibroblasts can be stimulated to such a degree that they regain the ability to produce elastic fibers—a function which usually is greatly diminished with increasing age. The findings seem to be important from the view point of rejuvenation of aging human skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561834
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  • 8
    Electronic Resource
    Electronic Resource
    Expression of IFNγ, coexpression of TNFα and matrix metalloproteinases and apoptosis of T lymphocytes and macrophages in granuloma annulare (2000)
    Springer
    Archives of dermatological research 292 (2000), S. 384-390 
    Details
    ISSN: 1432-069X
    Keywords: Key words Granuloma annulare ; Cytokine ; Apoptosis ; Lymphocytes ; Macrophages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Granuloma annulare, a prototype noninfectious granulomatous dermatitis, is morphologically characterized by a necrobiotic core surrounded by a cellular infiltrate. Because of many morphological similarities to tuberculosis, granuloma annulare has been suggested to represent a delayed-type hypersensitivity (Th1) reaction in the course of which inflammatory cells elicit matrix degradation. In the present study we (1) investigated the expression of interferon-Á as the most important Th1-associated cytokine, (2) sought in situ evidence for the coexpression of the proinflammatory cytokine tumor necrosis factor-· and cytokine-regulated matrix metalloproteinases 2 (gelatinase A) and 9 (gelatinase B), and (3) sought to determine whether shrunken cells seen within necrobiotic areas of granuloma annulare are apoptotic cells. In situ hybridization combined with immunofluorescence showed that large numbers of infiltrating CD3+ lymphocytes express interferon-Á. Application of catalyzed signal amplification in immunodetection revealed that the vast majority of CD3+ lymphocytes and CD68+ macrophages contained tumor necrosis factor-·. Immunohistochemistry demonstrated that macrophages producing tumor necrosis factor-· coexpress matrix metalloproteinases 2 and 9. In situ end-labeling combined with immunofluorescence detected few apoptotic T cells in perivascular regions and numerous apoptotic macrophages within necrobiotic areas. These results suggest that in granuloma annulare interferon-Á+ Th-1 lymphocytes may cause a delayed-type hypersensitivity reaction whereby macrophages are differentiated to aggressive effector cells expressing tumor necrosis factor-α and matrix metalloproteinases. In parallel, activation-induced apoptosis in lymphocytes and macrophages may serve to restrict the destructive potential of the inflammatory cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004030000150
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of charge-density-wave depinning on the low frequency shear compliance of NbSe3 (2001)
    Springer
    The European physical journal 24 (2001), S. 425-429 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems – 72.15.Nj Collective modes (e.g., in one-dimensional conductors) – 62.30.+d Mechanical and elastic waves; vibrations – 62.40.+i Anelasticity, internal friction, stress relaxation, and mechanical resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report on measurements of the voltage dependence of the complex shear compliance of two crystals of the charge-density-wave (CDW) conductor NbSe3, for torsional frequencies between 1 Hz and 71 Hz. For both samples, there is a frequency independent, ∼1% increase of the magnitude of the compliance when the voltage exceeds the threshold for CDW depinning, but the internal friction has a striking sample dependence which we do not understand. For one sample, there is a frequency independent decrease in internal friction with CDW depinning, suggesting that the elastic changes are not relaxational and might reflect changes in the screening of the crystal strain by the CDW. For the second sample, the sign and magnitude of the change in internal friction is strongly frequency dependent, which we associate with a change in screening due to the finite electron diffusion time. The second sample also exhibits a frequency dependent peak in internal friction near threshold that may reflect relaxation of the CDW phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10051-001-8694-1
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  • 10
    Electronic Resource
    Electronic Resource
    Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission (2000)
    Springer
    The European physical journal 18 (2000), S. 215-225 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 79.60.-i Photoemission and photoelectron spectra - 74.25.Jb Electronic structure - 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Full k -maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the antiferromagnetic insulator Sr2CuO2Cl2, which is taken as a representative of an undoped cuprate, and the Fermi surfaces of overdoped, optimally doped and underdoped Bi2Sr2CaCu2O8+δ high-temperature superconductors are mapped in the normal state. The results confirm the existence of large Luttinger Fermi surfaces at high doping with a Fermi surface volume proportional to (1+x), where x is the hole concentration. At very low doping, however, we find that this assumption based on Luttinger's theorem is not fulfilled. This implies a change in the topology of the Fermi surface. Furthermore the intensity of the shadow bands observed on the Fermi surface of Bi2Sr2CaCu2O8+δ as a function of the doping is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070051
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