The dielectric properties of aqueous nucleic acid solutions

1966 ◽  
Vol 291 (1426) ◽  
pp. 368-388 ◽  
Keyword(s):  
Dielectric Properties ◽  
High Frequency ◽  
Deoxyribonucleic Acid ◽  
General Pattern ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Theoretical Interpretation ◽  
Acid Solutions ◽  
Dispersion Region ◽  
Ionic Polarization

The dielectric properties of aqueous solutions of the sodium salts of ribonucleic acid and deoxyribonucleic acid have been determined. The general pattern of behaviour observed for other aqueous polyelectrolyte systems has been verified in these studies. There are indications that a low frequency dispersion region (below 2 Mc/s) is present as well as the normal high frequency dispersion region. The theoretical interpretation of the experimental results makes use of the O’Konski theory of ionic polarization and the formulation of an equilibrium between counterions ‘non-specifically bound’ and ‘free’ from the electrostatic field of the polyion. Calculations are made on the basis of this theory and estimates of the values of the specific conductivities existing at the polyion surface are made.

Magnetic Permeability and Relaxation Frequency in High Frequency Magnetic Materials.

2001 ◽  
Vol 674 ◽  
Author(s):  
M.I. Rosales ◽  
H. Montiel ◽  
R. Valenzuela
Keyword(s):  
High Frequency ◽  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Anisotropy Constant ◽  
Relaxation Frequency ◽  
Resonance Relaxation ◽  
Frequency Behavior

ABSTRACTAn investigation of the frequency behavior of polycrystalline ferrites is presented. It is shown that the low frequency dispersion (f < 10 MHz) of permeability is associated with the bulging of pinned domain walls, and has a mixed resonance-relaxation character, closer to the latter. It is also shown that there is a linear relationship between the magnetocrystalline anisotropy constant, K1, and the relaxation frequency. The slope of this correlation depends on the grain size. Such a relationship could allow the determination of this basic parameter from polycrystalline samples.

DIELECTRIC PROPERTIES OF DRY, GEOLOGIC MATERIALS

Geophysics ◽  
1970 ◽  
Vol 35 (4) ◽  
pp. 624-645 ◽  
Author(s):  
M. Saint‐Amant ◽  
David W. Strangway
Keyword(s):  
Dielectric Properties ◽  
Loss Tangent ◽  
Relaxation Times ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Relaxation Peak ◽  
Debye Relaxation ◽  
Thermally Activated ◽  
Geologic Materials ◽  
Frequency Independent

A detailed investigation of the dielectric properties of powdered and solid dry rocks in the frequency range of 50 hz to 2 mhz has revealed the following general characteristics: 1) All dry rocks, powdered and solid, show an increase in both the dielectric constant and the loss tangent as frequency decreases and as temperature increases. This dispersion is believed to be due to polarization associated with charge buildup at grain boundaries or at grain imperfections. 2) Dry powdered rocks often show a thermally‐activated relaxation peak with a typical Debye‐relaxation character. This is due to the presence of pyroxene and biotite and may be associated with other minerals. The relaxation peak is not seen in solid rocks, where it is hidden by the low‐frequency dispersion. 3) At high frequencies, the loss tangent approaches a constant value which is frequency independent. This behavior is observed in many dielectrics and may be the result of a distribution of relaxation times.

Dielectric properties of amino acid solutions II. Dielectric dispersion in aqueous proline and hydroxyproline solutions

1968 ◽  
Vol 307 (1490) ◽  
pp. 345-357 ◽  
Keyword(s):  
Amino Acid ◽  
Dielectric Properties ◽  
Complex Permittivity ◽  
Aminocaproic Acid ◽  
Dielectric Dispersion ◽  
Acid Solutions ◽  
Dispersion Region ◽  
Central Regions ◽  
Amino Acid Solutions

Measurements of the complex permittivity of 1 M proline and 1 M hydroxyproline solutions have been made between 300 and 2000 Mc/s and of 3 and 6 M proline solutions between 80 and 2000 Mc/s at a number of temperatures between 0 and 50°C. Considerable dispersion is observed in all cases and the shift of the dispersion region to longer wavelengths with concentration enables the central regions of very large dispersions to be observed for the 3 and 6 M proline solutions. The method of interpretation is as used for ɛ -aminocaproic acid solutions in paper I.

Analysis of the unusual position of the low-frequency dispersion region of a heterogeneous mixture-spacers system

1982 ◽  
Vol 25 (7) ◽  
pp. 590-593
Author(s):  
V. V. Zagoskii ◽  
E. A. Zamotrinskaya ◽  
T. G. Mikhailova ◽  
V. M. Nesterov
Keyword(s):  
Low Frequency ◽  
Frequency Dispersion ◽  
Heterogeneous Mixture ◽  
Dispersion Region ◽  
Unusual Position

Influence of Iodine on Low Frequency Dielectric Properties of Anthrone

1995 ◽  
Vol 60 (11) ◽  
pp. 1809-1814
Author(s):  
Grzegorz W. Bak ◽  
Marian Kryszewski
Keyword(s):  
Charge Transfer ◽  
Dielectric Properties ◽  
Dielectric Response ◽  
Charge Transfer Complex ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Low Loss ◽  
Remarkable Change ◽  
Ct Complex

Low frequency dielectric properties of polycrystalline anthrone and anthrone/iodine charge-transfer complex are presented. Polycrystalline anthrone proves to be a typical low-loss material. Iodization of anthrone pellets leads to a remarkable change in dielectric properties. Dielectric response of anthrone/iodine CT complex shows comparatively strong low frequency dispersion. The change in dielectric properties proves to be reversible to great extend as removing of iodine by heating at 373 K for a few hours almost completely restores the dielectric values of a virgin anthrone sample.

Zur Deutung der kernmagnetischen Relaxation in Proteinlösungen

1970 ◽  
Vol 25 (11) ◽  
pp. 1680-1684 ◽  
Author(s):  
R. Kimmich ◽  
F. Noack
Keyword(s):  
Relaxation Time ◽  
High Frequency ◽  
Relaxation Times ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Proton Relaxation ◽  
Protein Solutions ◽  
Longitudinal Relaxation Time ◽  
Two Phase ◽  
Protein Molecules

Abstract Measurements of longitudinal and transversal proton relaxation times in both H2O and mixed H2O/D2O protein solutions show a low-frequency as well as a high-frequency dispersion of the longitudinal relaxation time and a nonexponential two-phase transversal relaxation. These results are discussed qualitatively in terms of “rigid” and “mobile” relaxation centers within the protein molecules.

Complex Dielectric Spectroscopy Characterization of a Li0.982Ta1.004O3 Ferroelectric Single Crystal

1997 ◽  
Vol 500 ◽  
Author(s):  
Ming Dong ◽  
Rosario A. Gerhardt
Keyword(s):  
Dielectric Properties ◽  
Single Crystal ◽  
Measurement Data ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Nonlinear Least Squares ◽  
Electrical Measurement ◽  
Ferroelectric Single Crystal ◽  
Crystal Bulk

ABSTRACTThe dielectric properties of a c-oriented ferroelectric Li0.982Ta1.004O3 single crystal have been investigated. The frequency and the temperature dependence of the dielectric properties have been measured from 500 to 650°C at frequencies ranging from 5 to 106 Hz. Both blocking and non-blocking electrodes were used for separating the electrode effect from the crystal bulk dielectric response. A low-frequency dispersion was identified to be due to the contribution of Li+ ionic carriers. Based on the electrical measurement data and complex nonlinear least squares fitting, an equivalent circuit is proposed to represent the dielectric properties of the single crystal.

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