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  • Artikel: DFG Deutsche Nationallizenzen  (3)
  • biological cell  (2)
  • Bias-voltage effect  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Dielectric imaging of biological cells (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 1095-1097 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Dielectric relaxation ; scanning dielectric microscope ; interfacial polarization ; biological cell
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract A dielectric technique that can image local permittivity and conductivity has been applied to living biological cells in an aqueous environment. The local permittivity and conductivity were measured between 10 kHz and 10 MHz with a fine probe electrode, which was laterally scanned over cells on a plate electrode. The dielectric images of the cells depended on frequency, indicating dielectric relaxation that is due to interfacial polarization. The low-frequency image (at ∼10 KHz) in which the cells have high permittivity and low conductivity compared with the medium results from the presence of the plasma membrane with high resistivity. The dielectric image of the cell interior is obtainable at high frequencies (∼10 MHz), where the plasma membrane is short-circuited.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00657679
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Dielectric monitoring of biological cell sedimentation (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 78-84 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Dielectric relxation ; biological cell ; sedimentation ; erythrocyte ; interfacial polarization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract A dielectric theory was developed to analyze dielectric relaxation of a system in which biological cells are settling perpendicular and parallel to electrode planes. The theory predicts that the dielectric relaxation intensity (Δε) increases markedly with increasing time when the settling direction is perpendicular to electrode planes, whereas Δε is less sensitive to the sedimentation in a direction parallel to electrode planes. These theoretical expectations agreed well with the experimental results obtained with sheep erythrocytes. Analysis based on this theory provided the sedimentation rate of sheep erythrocytes, the results being in agreement with those obtained by the conventional method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656933
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Theoretical approach and the practice to the evaluation of structural parameters characterizing concentration polarization alongside ion-exchange membranes by means of dielectric measurement (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 766-773 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Bias-voltage effect ; concentration polarization ; dielectric relaxation ; electrodialysis ; ion-exchange membrane
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract As the application of a dielectric theory proposed previously (J Membrane Sci 64:153–161 (1991)), theoretical formulation and the practical procedure of dielectric analysis are developed to calculate the structural parameters such as the conductivity gradient and the thickness of the concentration polarization layer, the capacitances and the conductances of the two adjoining aqueous phases from the observed dielectric parameters. The procedure of calculation consequent upon the theoretical formulation was applied to double relaxation data observed for cation-exchange membrane systems under application of d.c. bias voltage. As a consequence, the structural parameters of concentration polarization were readily obtained with accuracy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00660093
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