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  • 1
    Electronic Resource
    Electronic Resource
    Interfacial instability and the agglutination of erythrocytes by polylysine (1985)
    Springer
    European biophysics journal 13 (1985), S. 123-130 
    Details
    ISSN: 1432-1017
    Keywords: Erythrocyte ; interfacial instability ; surface wave ; polylysine ; cell agglutination ; cell adhesion, acrosome reaction ; membrane fusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Human erythrocytes have been exposed to poylysine of molecular weight range 4 to 220 kDa and concentration range 0.5 to 2,000 μ/ml at 37°C. Threshold concentrations for cell agglutination by the polycation have been determined for the samples of different molecular weight. Light and electron micrographs show that, in the erythrocyte agglutinates, cell-cell contact is generally made only at discrete, spatially periodic, regions which are distributed over a significant part of the cell surface. The average spacing between contact regions is 0.83 μm. The cell membrane has a wavy profile between contact regions. Agglutination occurs only in cell samples whose electrophoretic mobility is significantly altered by polylysine and, in agreement with a previous report, occurs even when the electrophoretic mobility reaches high positive values. The electrophoretic mobility data implies that agglutination requires some protrusion of polylysine from the cell glycocalyx. We discuss how a resulting net attractive intercellular force could act to destabilize the aqueous layer between two cells, allowing surface wave growth which results in spatially periodic contact regions. Examples of situations where cell and membrane contact might be explained by the general concept of interfacial instability are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256532
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  • 2
    Electronic Resource
    Electronic Resource
    Real time observations of polylysine, dextran and polyethylene glycol induced mutual adhesion of erythrocytes held in suspension in an ultrasonic standing wave field (1987)
    Springer
    European biophysics journal 14 (1987), S. 499-507 
    Details
    ISSN: 1432-1017
    Keywords: Erythrocyte ; cell adhesion, cell agglutination ; acoustic radiation force ; ultrasonic levitation ; interfacial instability ; polylysine ; dextran ; polyethylene glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract A technique which enables cells to be observed in suspension for times of the order of minutes (employing acoustic radiation foreces in a 1 MHz ultrasonic standing wave field) is described. Video recordings of the mutual adhesion of human erythrocytes in suspension have been analysed. Concave-ended cell doublets and linear rouleaux developed in 0.5–1.5% w/v Dextran T500 by a gradual (2.5–17 s) increase in the area of cell contact over the cell cross-section. The concave-ended rouleaux form was not seen in polylysine or in polyethylene glycol. In 5–7% dextran and in 20μg/ml polylysine mutual adhesion was a two stage process. Cells first form a strong local contact which persists (without apparently growing in area) for a number of seconds following which the cell surfaces move suddenly to form a spherical doublet. The average initial contact time and engulfment time for cells in 7% Dextran T500 are 18 and 2.7 s, respectively. The corresponding values for cells in 20 μg/ml, 14 kDa, polylysine are 2.7 and 0.3 s. There was no initial contact delay during spherical doublet formation in mg/ml polylysine. Electron microscopy showed that the intercellular seam for spherical doublets formed with all three agglutinating molecules was bent in a wavy (λ∼4 μm) profile. The thickness of the intercellular space varied in a spatially periodic way (λ∼0.8 μm) for cells in polylysine. Examples of periodic intercellular spaces were seen by light microscopy in polyethylene glycol induced clumps. The role of interfacial instability in the adhesion processes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293260
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  • 3
    Electronic Resource
    Electronic Resource
    The adverse effect of perpendicular ion drift flow on cylindrical triple probe electron temperature measurements (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 678-681 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The cylindrical triple probe method is an attractive technique for measuring electron temperatures (Te) and electron number densities (ne) in a variety of plasmas sources. In practice, however, the cylindrical triple probe can be sensitive to sources of error that affect all Langmuir probe techniques. In particular, the presence of an ion drift velocity component that is perpendicular to the probe axis has been known to result in erroneous measurements of ne. Less obvious, however, is that ion flow perpendicular to the probe has a significant effect on the indicated Te. The purpose of this note is to make researchers aware of such an effect and to demonstrate a technique which can mitigate it. The approach taken to investigate this phenomenon was to make Te measurements in the plume of a 20 kW magnetoplasmadynamic thruster with the probe oriented at several angles with respect to the local ion flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145138
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  • 4
    Electronic Resource
    Electronic Resource
    Hysteresis loops of ferroelectric bilayers and superlattices (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2755-2757 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A ferroelectric superlattice with an antiferroelectric interfacial coupling is considered; the same model describes a bilayer with antiferroelectric coupling. By mapping minimum points in the Landau free energy expression and plotting them against the applied electric field, a triple hysteresis loop pattern is obtained. The loop patterns vary between typically ferroelectric and typically antiferroelectric depending on the layer thicknesses and the magnitude of the interfacial-coupling constant. This work suggests the possibility of designing multilayer elements for computer memories with four or more different storage states. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1320040
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  • 5
    Electronic Resource
    Electronic Resource
    Hyperthermia-induced changes in the morphology of CHO-K1 and their refractile inclusions
    Amsterdam : Elsevier
    Journal of Thermal Biology 7 (1982), S. 231-242 
    Details
    ISSN: 0306-4565
    Keywords: CHO-K1 ; blebbing ; cinemicroscopy ; cytoskeleton ; hyperthermia ; microcapillaries ; organelle movement ; refractile inclusions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0306-4565(82)90030-4
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal denaturation of the erythrocyte cytoskeleton alters the morphological changes associated with osmotic swelling
    Amsterdam : Elsevier
    Journal of Thermal Biology 10 (1985), S. 187-190 
    Details
    ISSN: 0306-4565
    Keywords: Human erythrocyte ; membrane bilayer couple ; membrane deformability ; osmotic swelling ; plasma membrane ; stomatocytes ; thermal denaturation of spectrin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0306-4565(85)90038-5
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  • 7
    Electronic Resource
    Electronic Resource
    Proximity effect of a superconductor on an antiferromagnetic metal (1967)
    Springer
    The European physical journal 6 (1967), S. 236-242 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé Dans un métal antiferromagnétique l'energie de découplage des paires doit être constituée de deux facteurs. Le premier, considéré dejà parde Gennes etSarma, est dû au désordre parmi les ions magnetiques. Le deuxième est produit par la contribution de la dispersion électron-magnon, et dépend de la temperature. Ce facteur, calculé dans le domaine de temperatureT N(J/μ)2≪T≪T N, est de l'ordre deT 2/T N. (T N = temperature de Néel,μ = energie de Fermi,J = intégrale d'échange entre les electrons conducteurs et les ions magnétiques).
    Abstract: Zusammenfassung Es gibt in einem antiferromagnetischen Metall zwei Energiebeiträge, welche der supraleitenden Paarbildung entgegenwirken. Der erste wurde vonde Gennes undSarma diskutiert und beruht auf der Unordnung der magnetischen Ionen. Die Elektron-Magnon-Streuung liefert einen temperaturabhängigen Beitrag. Dieser wurde für den TemperaturbereichT N(J/μ)2≪T≪T N berechnet und ist proportional zuT 2/T N. (T N = Néeltemperatur,μ = Fermienergie,J = Austauschintegral zwischen Leitungselektronen und magnetischen Ionen.)
    Notes: Abstract There should be two contributions to the pair breaking energy in an antiferromagnetic metal. The first, already discussed byde Gennes andSarma, is due to disorder on the magnetic sites. The second is a temperature dependent contribution from electron magnon scattering. This term is calculated for the temperature rangeT N(J/μ)2≪T≪T N and found to be of orderT 2/T N. (T N = Néel temperature,μ = Fermi energy,J = exchange coupling between conduction electrons and magnetic ions.)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422720
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  • 8
    Electronic Resource
    Electronic Resource
    Far infrared measurements of bulk and surface phonons in GaAs/AlAs superlattices (1990)
    Springer
    International journal of infrared and millimeter waves 11 (1990), S. 901-917 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have used far-infrared oblique-incidence reflection spectroscopy to study bulk phonon polaritons, and attenuated total reflection (ATR) spectroscopy to study surface phonon polaritons, in long-period GaAs/AlxGa1−xAs and short-period GaAs/AlAs superlattices. Results on the former are in good agreement with an effective-medium bulk-slab model of the dielectric tensor of the superlattice; results on the latter are analysed in terms of a model that contains dielectric-tensor contributions from the confined optic phonons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008634
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  • 9
    Electronic Resource
    Electronic Resource
    Time dependent Ginzburg-Landau equation and normal state correlation function (1970)
    Springer
    The European physical journal 238 (1970), S. 399-403 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that the kernel of the integral equation for the time dependent pair potential can be expressed in terms of a retarded classical normal state correlation function, as conjectured by Bergmann. The proof makes the same assumptions as the corresponding proof for the time independent equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409424
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of the inelastic reflection of light off a superconductor (1972)
    Springer
    The European physical journal 254 (1972), S. 71-80 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We give a general formulation for the problem of scattering of light off the surface of a superconductor with the creation of two quasiparticles. The cross-section is evaluated at all temperatures for a pure superconductor; at zero temperature the result agrees with earlier calculations by Abrikosov and Falkovskii and by Tong and Maradudin. At zero temperature there is no scattering with a frequency shift ω of less than 2Δ; as the temperature increases the scattering for ω〈2 Δ increases progressively because of the increasing number of thermally excited quasiparticles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379691
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