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  • 1
    Electronic Resource
    Electronic Resource
    Time-of-flight investigation of infrared laser-induced multilayer desorption of benzene (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 8330-8340 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared (IR) laser-induced resonant desorption/ablation of benzene layers condensed on liquid-nitrogen-cooled substrates has been investigated using the time-of-flight (TOF) technique. Adsorbates of up to 5 μm thickness were irradiated with a line-tuned TEA CO2 laser. Time-resolved detection of desorbed particles was performed with a quadrupole mass spectrometer (QMS). Measured TOF spectra can usually be well fitted with a stream-modified Maxwell–Boltzmann distribution. Systematic deviations from these fits were observed depending on film thickness, laser fluence, and angle of detection. Spectroscopic data of the adsorbate–substrate system needed for model calculations were measured in situ. The absorption coefficients were found to be fluence dependent. Measurements of the desorption yield and kinetic energy of the desorbed particles were performed with the P932 and P934-CO2 laser lines as a function of film thickness and laser fluence. The solid–liquid phase transition could clearly be observed in these experiments. Average kinetic energies of up to 0.8 eV were measured in the TOF spectra, where the adsorbate temperature could be estimated to be less than 600 K. IR multilayer laser-induced desorption (LID) exhibits features very similar to those reported for UV multilayer LID. A mechanism based on the sudden rise of the adsorbate vapor pressure due to fast energy deposition by the laser pulse is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465606
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  • 2
    Electronic Resource
    Electronic Resource
    Asymptotic behavior of modulated Taylor–Couette flows with a crystalline inner cylinder (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1891-1903 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear stability of a modulated Taylor–Couette system when the inner cylindrical boundary consists of a crystalline solid-liquid interface is considered. Both experimentally and in numerical calculations it is found that the two-phase system is significantly less stable than the analogous rigid-walled system for materials with moderately large Prandtl numbers. A numerical treatment based on Floquet theory is described, which gives results that are in good agreement with preliminary experimental findings. In addition, this instability is further examined by carrying out a formal asymptotic expansion of the solution in the limit of large Prandtl number. In this limit the Floquet analysis is considerably simplified, and the linear stability of the modulated system can be determined to leading order through a conventional stability analysis, without recourse to Floquet theory. The resulting simplified problem is then studied for both the narrow gap geometry and for the case of a finite gap. It is surprising that the determination of the linear stability of the two-phase system is considerably simpler than that of the rigid-walled system, despite the complications introduced by the presence of the crystal-melt interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858815
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  • 3
    Electronic Resource
    Electronic Resource
    An insoluble surfactant model for a vertical draining free film with variable surface viscosity (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 13 (2001), S. 2492-2502 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A mathematical model is constructed to study the evolution of a vertically oriented, thin, free liquid film draining under gravity when there is an insoluble surfactant, with finite variable surface viscosity, on its free surface. Lubrication theory for this free film results in three coupled nonlinear partial differential equations describing the free surface shape, the surface velocity and the surfactant transport, at leading order. In the limit of large surface viscosity and the Marangoni effect, the evolution of the free surface is that of a rigid film. For mobile films with small surface viscosity, transition from a mobile to an essentially immobile film is observed for large Marangoni effects. It is also verified that stable aqueous films can be formed in the regime of high surfactant concentrations. The theoretical results are compared with experiment; the purpose of both is to act as a model problem to evaluate the effectiveness of surfactants for potential use in foam-fabrication processes. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388540
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  • 4
    Electronic Resource
    Electronic Resource
    Immunohistological localization of trypsin in mucus-secreting cell layers of Atlantic salmon, Salmo salar L. (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 13 (1990), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Immunohistochcmical examination showed that trypsin was present in mucus-secreting cell layers of Atlantic salmon, such as surface epithelial cells of gills and intestine, and epidermal cells of dorsal skin. Trypsin in tissue slices was identified by an immunohisto-chemical technique which used affinity purified immunoglobulins from rabbit antisera against purified salmon pancreatic trypsin as primary antibodies. Most of the positively stained cells appeared to be granulated and secretory. The authors hypothesize that trypsin in mucus-secreting cell layers is a part of the non-specific immune defence of the fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1990.tb00778.x
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  • 5
    Electronic Resource
    Electronic Resource
    Transmission Experiments with Optically Generated Carriers in the 60 GHz-Region (2000)
    Springer
    Wireless personal communications 14 (2000), S. 85-101 
    Details
    ISSN: 1572-834X
    Keywords: mobile communication ; broadband communication ; multichannel operation ; millimeter-wave radio communication ; optical fibres ; semiconductor lasers ; optic-millimeter wave converter ; phase noise ; sideband injection locking ; quadrature phase shift keying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Bidirectional and 2-channel 155 Mbit/s transmissionexperiments in the OQPSK format are reported usingoptically generated millimeter-waves at frequencies inthe 60 GHz band. By applying the sideband injectionlocking technique the remotely generatedmillimeter-wave signals depict quartz accuracy and lowphase noise 〈−100 dBc/Hz at offset frequencies≥1 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008950206222
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  • 6
    Electronic Resource
    Electronic Resource
    PCNA-Expression als Marker zur Charakterisierung der Proliferationsaktivität beim Mammakarzinom (1993)
    Springer
    Archives of gynecology and obstetrics 254 (1993), S. 851-853 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Wertigkeit des neuen monoklomalen Antikörpers (MAk) Anti-PCNA (Proliferating Cell Nuclear Antigen) zur Bestimmung der Proliferationsaktivität wurde anahnd von 275 histologisch gesicherten Mammakarzinomen untersucht. Etablierte Prognosefaktoren (Histologie, Grading, Tumorgröße, Nodalstatus, Hormonrezeptorstatus) und die Wachstumsfraktion-KI67 wurden mit der PCNA-Expression korreliert. PCNA erweist sich als zuverlässiger Marker zur Bestimmung der Proliferationsaktivität. Der Vorteil dieser Bestimmung liegt in der unkomplizierten Methodik und Reproduzierbarkeit durch die mögliche Anwendung an formalinfixierten und paraffineingebetteten Material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02266204
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  • 7
    Electronic Resource
    Electronic Resource
    Resolution of discrepancy between backward angle cross-section data for neutron-deuteron elastic scattering (1994)
    Springer
    Few body systems 16 (1994), S. 127-142 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-accuracy differential cross-section data for neutron-deuteron elastic scattering at centre-of-mass backward angles in the range from 140° to 178° have been measured to accuracies better than ±3% for incident neutron energies of 8.0, 10.0, and 14.0 MeV. The measurements were made by detection of the recoil deuterons and protons from a mixed CD2-CH2 foil. The new data are compared to existing data and to three-nucleon calculations with the Bonn-B nucleon-nucleon potential. We conclude that the present measurements unambiguously resolve the discrepancies among previously reported data of the same type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01355285
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  • 8
    Electronic Resource
    Electronic Resource
    Cold agglutinins of anti-Pr specificity in rubella embryopathy (1992)
    Springer
    Annals of hematology 64 (1992), S. 277-280 
    Details
    ISSN: 1432-0584
    Keywords: Autoimmune hemolytic anemia ; Cold agglutinins ; Rubella embryopathy ; Rubella infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cold agglutinins of anti-Pr specificity were detected in two newborn infants suffering from serologically ascertained rubella embryopathy, an IgM κ anti-Pra, titer 64, and an IgM λ anti-Pr1, titer 16. The cases are rare examples of cold agglutinin production in newborns; a possible relationship between anti-Pr specificity and rubella infection is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01695471
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  • 9
    Electronic Resource
    Electronic Resource
    Die Bedeutung der Wachstumsfraktion Ki 67 für Prognose und Verlauf des Mammakarzinoms (1993)
    Springer
    Archives of gynecology and obstetrics 254 (1993), S. 853-855 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die prognostische Wertigkeit des Proliferationsmarkers Ki 67 wurde bei 200 Patientinnen, die zwischen 1989 und 1990 wegen eines Mammakarzinoms in der UFK Charlottenburg operiert wurden, untersucht. Ki 67 wurde mit morphologischen Befunden und dem klinischen Verlauf korreliert. Die Beobachtungsdauer betrug 30 Monate. Es zeigte sich eine signifikante Korrelation zwischenKi 67 und dem Differenzierungsgrad (p〈0,01), Rezeptorstatus (p〈0,01) und Tumorgröße (p〈0,05). Hohe Ki 67 Werte korrelierten mit abnehmender Differenzierung, niedrigem Rezeptorstatus und zunehmender Tumorgröße. Hohe Ki 67 Werte waren mit einer erhöhten Rezidivneigung verbunden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02266205
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  • 10
    Electronic Resource
    Electronic Resource
    HSV-1 gB and VZV gp-II crossreactive antibodies in human sera (1990)
    Springer
    Archives of virology 112 (1990), S. 203-213 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The specificity and prevalence of human IgG antibodies crossreactive between HSV-1 (ANG) and VZV (Ellen) was examined in immunoblots. Using antibody fractions purified on HSV- and VZV-coated affinity chromatography columns and by preadsorption of sera with HSV and/or VZV lysates a cross-reactivity between HSV-1 gB and VZV gp-II was demonstrated. Crossreaction of human IgG antibodies among other structural and nonstructural viral proteins, however, was not detected. The frequency of human IgG antibodies crossreactive between HSV-1 gB and VZV gp-II was highest in HSV-seropositive patients experiencing an acute primary VZV infection (4 out of 5 sera tested). In contrast, no crossreactive antibodies were found in sera of HSV-seronegative patients with acute primary VZV infection (0/6) or in sera from individuals with acute recurrent HSV or VZV infection (0/12). Analysis of sera from individuals with previous HSV and/or VZV infection showed the presence of antibodies crossreactive between HSV-1 gB and VZV gp-II in 3 out of 30 sera tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323165
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