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Ermilova E, Bier FF, Hölzel R. Dielectric measurements of aqueous DNA solutions up to 110 GHz. Phys Chem Chem Phys 2014; 16:11256-64. [DOI: 10.1039/c3cp55272a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Li J, Zhao K, Liu C. Dielectric relaxations of poly(acrylic acid)-graft-poly(ethylene oxide) aqueous solution: analysis coupled with scaling approach and hydrogen-bonding complex. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:042603. [PMID: 23679439 DOI: 10.1103/physreve.87.042603] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 03/19/2013] [Indexed: 06/02/2023]
Abstract
Dielectric properties of poly(acrylic acid)-graft-poly(ethylene oxide) (PAA-g-PEO) aqueous solution were measured as a function of concentration and temperature over a frequency range of 40 Hz to 110 MHz. After subtracting the contribution of electrode polarization, three relaxation processes were observed at about 20 kHz, 220 kHz, and 4 MHz, and they are named low-, mid- and high-frequency relaxation, respectively. The relaxation parameters of these three relaxations (dielectric increment Δε and relaxation time τ) showed scaling relations with the polyelectrolyte concentration. The mechanisms of the three relaxations were concluded in light of the scaling theory: The relaxations of low- and mid frequency were attributed to the fluctuation of condensed counterions, while the high-frequency relaxation was ascribed to the fluctuation of free counterions. Based on the dielectric measurements of varying temperatures, the thermodynamic parameters (enthalpy change ΔH and entropy change ΔS) of the three relaxations were calculated and these relaxation processes were also discussed from the microscopic thermodynamical view. In addition, the impacts of PEO side chains on the conformation of PAA-g-PEO chains were discussed. PEO side chains greatly strengthen the hydrogen-bonding interactions between PAA-g-PEO chains, resulting in the chains overlapping at a very low concentration and the formation of a hydrogen-bonding complex. Some physicochemical parameters of PAA-g-PEO molecules were calculated, including the overlap concentration, the effective charge of the chain, the friction coefficient, and the diffusion coefficient of hydrogen counterions.
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Affiliation(s)
- Jingliang Li
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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Kryston TB, Georgiev AB, Pissis P, Georgakilas AG. Role of oxidative stress and DNA damage in human carcinogenesis. Mutat Res 2011; 711:193-201. [DOI: 10.1016/j.mrfmmm.2010.12.016] [Citation(s) in RCA: 644] [Impact Index Per Article: 49.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 12/22/2010] [Accepted: 12/31/2010] [Indexed: 04/08/2023]
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Sun Y, Zhang Y, Pickwell-Macpherson E. Investigating antibody interactions with a polar liquid using terahertz pulsed spectroscopy. Biophys J 2011; 100:225-31. [PMID: 21190675 DOI: 10.1016/j.bpj.2010.11.020] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Revised: 11/10/2010] [Accepted: 11/16/2010] [Indexed: 01/17/2023] Open
Abstract
In this article, we use terahertz spectroscopy to study the dielectric properties of the peroxidase-conjugated affinity purified goat anti-cat immunoglobulin G and the fluorescein-conjugated affinity purified goat anti-cat immunoglobulin G when they interact with polar liquids. The influence of protein concentration, as well as presence of glycerol as a cosolvent, is determined by estimation of the effective hydration shell radius of the protein in solution. The dielectric spectra in this study are measured over the frequency range 0.1-1.3 THz and it is found that the dielectric properties are dependent on the type of the charges in the hydrogen-bonded antibodies' networks. Our results indicate that the terahertz dielectric properties of polar liquids are strongly affected by the presence of the antibody and suggest that the dielectric spectrum is particularly powerful in the study of structural and conformational properties of proteins. Therefore, terahertz spectroscopy is a very sensitive approach to investigate structural features of biological systems.
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Affiliation(s)
- Yiwen Sun
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong
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Bonincontro A, Cametti C, Nardiello B, Marchetti S, Onori G. Dielectric behavior of DNA in water–organic co-solvent mixtures. Biophys Chem 2006; 121:7-13. [PMID: 16380204 DOI: 10.1016/j.bpc.2005.12.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2005] [Revised: 12/06/2005] [Accepted: 12/07/2005] [Indexed: 10/25/2022]
Abstract
The radiowave dielectric dispersions of DNA in different water-organic co-solvent mixtures have been measured in the frequency range from 100 kHz to 100 MHz, where the polarization mechanism is generally attributed to the confinement of counterions within some specific lengths, either along tangential or perpendicular to the polyion chain. The dielectric dispersions have been analyzed on the basis of two partially different dielectric models, a continuum counterion fluctuation model proposed by Mandel and a discrete charged site model, proposed by Minakata. The influence of the quality of the solvent on the dielectric parameters has been investigated in water-methanol and water-glycerol mixtures at different composition, by varying the permittivity (m) and the viscosity eta of the solvent phase. The analysis of the dielectric spectra in solvents where electrostatic and hydrodynamic interactions vary with the solvent composition suggests that both the two models are able, in principle, to account for the observed high-frequency dielectric behavior. However, while some certain assumptions are necessary about the polyion structure within the Mandel model, no structural prerequisite is needed within the Minakata model, where the polarization mechanism invoked considers a radial counterion exchange with the outer medium, which is largely independent of the local polyion conformation.
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Affiliation(s)
- A Bonincontro
- Dipartimento di Fisica, Research Center SOFT-INFM-CNR and CNISM Universita' di Roma "La Sapienza" Piazzale A. Moro 5, I-00185- Rome, Italy.
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Sun M, Pejanović S, Mijović J. Dynamics of Deoxyribonucleic Acid Solutions As Studied by Dielectric Relaxation Spectroscopy and Dynamic Mechanical Spectroscopy. Macromolecules 2005. [DOI: 10.1021/ma051596j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mingyun Sun
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
| | - Srdjan Pejanović
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
| | - Jovan Mijović
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
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Vanderstraeten J, Vander Vorst A. Theoretical evaluation of dielectric absorption of microwave energy at the scale of nucleic acids. Bioelectromagnetics 2004; 25:380-9. [PMID: 15197763 DOI: 10.1002/bem.20001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A theoretical model is proposed for the evaluation of dielectric properties of the cell nucleus between 0.3 and 3 GHz, as a function of its nucleic acids (NA) concentration (CNA). It is based on literature data on dielectric properties of DNA solutions and nucleoplasm. In skeletal muscle cells, the specific absorption rate (SAR) ratio between nucleoplasm and cytoplasm is found to be larger than one for CNA above 30 mg/ml. A nearly linear relationship is found between CNA and this nucleocytoplasmic SAR ratio. Considering the nanoscale of the layer of condensed counterions and bound water molecules at the NA-solution interface, the power absorption per unit volume is evaluated at this precise location. It is found to be between one and two orders of magnitude above that in muscle tissue as a whole. Under realistic microwave (MW) exposure conditions, however, these SAR inhomogeneities do not generate any significant thermal gradient at the scale considered here. Nevertheless, the question arises of a possible biological relevance of nonnegligible and preferential heat production at the location of the cell nucleus and of the NA molecules.
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Ermolina I, Morgan H, Green NG, Milner JJ, Feldman Y. Dielectric spectroscopy of Tobacco Mosaic Virus. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1622:57-63. [PMID: 12829262 DOI: 10.1016/s0304-4165(03)00118-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The dielectric properties of the Tobacco Mosaic Virus (TMV) have been measured using time domain dielectric spectroscopy (TDDS) in the temperature range from 1 to 40 degrees C. A single dielectric dispersion is observed in the MHz range. The activation energy of the process is found to be in the range 1-2 kcal/mol. The experimental data could not be completely accounted for by current theoretical models, but evidence indicates that the dielectric loss arises from polarisation of charge on and around the virus.
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Affiliation(s)
- I Ermolina
- Bioelectronics Research Centre, Department of Electronics and Electrical Engineering, University of Glasgow, Rankine Building, Glasgow G12 8LT, Scotland, UK
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Bonincontro A, Marchetti S, Onori G, Santucci A. Complex formation between DNA and dodecyl-dimethyl-amine-oxide induced by pH. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00074-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bakewell DJ, Ermolina I, Morgan H, Milner J, Feldman Y. Dielectric relaxation measurements of 12 kbp plasmid DNA. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1493:151-8. [PMID: 10978517 DOI: 10.1016/s0167-4781(00)00176-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The dielectric properties of 12 kbp plasmid DNA have been measured as a function of temperature in the range 5 degrees C to 40 degrees C. Time domain reflectometry was used to obtain dielectric data over the frequency range from 200 kHz to 3 GHz. Values of the frequency dependent polarisability per DNA macromolecule have been determined from the measurements. Possible mechanisms that could account for the dielectric dispersion are also discussed, in particular the counterion fluctuation model of Manning-Mandel-Oosawa.
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Affiliation(s)
- D J Bakewell
- Bioelectronics Research Centre, Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT, UK
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Blasi M, Bonincontro A, Cinelli S, Onori G, Risuleo G. Structural stability of ribosomes subjected to RNase treatment evidenced by dielectric spectroscopy and differential scanning microcalorimetry. Biophys Chem 2000; 83:73-8. [PMID: 10631481 DOI: 10.1016/s0301-4622(99)00124-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Previous studies from our laboratory demonstrated the existence of at least two levels of structural complexity in E. coli 70S ribosomes. Ribosomal RNA seems to be principally involved in the overall stability of these structures. In this paper we present an investigation of ribosomes subjected to treatment with RNase. The study is based on both differential scanning microcalorimetry and dielectric spectroscopy. In the thermograms obtained on treated ribosomes only the low temperature peak of the two typical denaturation events observed in native ribosomes, is promptly eliminated by the enzyme treatment. Dielectric spectroscopy measurements carried out on the same samples indicate an alteration of the dielectric behavior previously shown to consist of two subsequent relaxation processes. In fact, only the low frequency relaxation is affected by the treatment. The second one, observed at higher frequency, remains unaltered. The same effect on the dielectric parameters is observed if the ribosome particles are heated and then cooled prior to measurement. These results are consistent with the idea that two different structures are present within the ribosome. One is very stable and withstands both temperature and RNase treatment while the second is promptly abolished by both treatments. Data presented here strongly suggest that the RNA domains exposed to the solvent play a fundamental role in the stability of the 3-D structure of the ribosome particle.
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Affiliation(s)
- M Blasi
- INFM-Dipartimento di Fisica, Università La Sapienza, Roma, Italy
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Bonincontro A, D'Archivi AA, Galantini L, Giglio E, Punzo F. On the Micellar Aggregates of Alkali Metal Salts of Deoxycholic Acid. J Phys Chem B 1999. [DOI: 10.1021/jp990278h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adalberto Bonincontro
- INFM, Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
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Lee RS, Bone S. Dielectric studies of chain melting and denaturation in native DNA. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1397:316-24. [PMID: 9582445 DOI: 10.1016/s0167-4781(98)00024-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dielectric methods, based on time domain reflectometry (TDR), have been employed to characterise DNA chain melting and denaturation. A dielectric dispersion has been identified, centred in the low megahertz region, which has been attributed to the fluctuation of counterions along short segments of the DNA chain. Chain melting studies have shown that the magnitude of this dispersion is dependent not only on the relative proportions of single to double stranded DNA but also on the intermolecular interactions between the DNA chains.
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Affiliation(s)
- R S Lee
- Institute of Molecular and Biomolecular Electronics, University of Wales, Dean Street, Bangor, Gwynedd, LL57 1UT, UK.
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Brauns EB, Murphy CJ, Berg MA. Local Dynamics in DNA by Temperature-Dependent Stokes Shifts of an Intercalated Dye. J Am Chem Soc 1998. [DOI: 10.1021/ja973207+] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bonincontro A, Briganti G, D'Archivio AA, Galantini L, Giglio E. Structural Study of the Micellar Aggregates of Sodium Taurodeoxycholate. J Phys Chem B 1997. [DOI: 10.1021/jp964004v] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Bonincontro A, Mari C, Mengoni M, Risuleo G. A study of the dielectric properties of E. coli ribosomal RNA and proteins in solution. Biophys Chem 1997; 67:43-50. [PMID: 9397518 DOI: 10.1016/s0301-4622(97)00014-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The permittivity of ribosomal proteins and ribosomal RNA (rRNA) in solution was measured in the range 100 kHz to 1 GHz at four different temperatures (5, 15, 25 and 35 degrees C). The experimental dielectric relaxation was analysed by the Cole-Cole equation and, from the best-fit parameters, the average values of the dipole moment and molecular radius of the proteins were obtained. The activation enthalpy was calculated from an Arrhenius plot of the relaxation time. The energy involved in the dielectric polarization of free proteins has a magnitude of about one hydrogen bond. The data on RNA were analysed according to the Mandel model. This analysis allowed the calculation of the "subunit b" as defined by Mandel. This parameter is dependent on the temperature and therefore the relaxation time does not follow the Arrhenius law. Our data thus show that, in solution, the rRNA structure is thermally rather unstable and highly flexible.
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Affiliation(s)
- A Bonincontro
- Dipartimento di Fisica, Università di Roma La Sapienza, Italy.
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Bone S, Lee RS, Hodgson CE. Dielectric studies of intermolecular interactions in native DNA. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1306:93-7. [PMID: 8611629 DOI: 10.1016/0167-4781(95)00232-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The concentration dependence of the high frequency dielectric dispersion exhibited by solutions of DNA and the sensitivity of this to the ionic strength of the solution are described. Dielectric data obtained are consistent with a model involving the fluctuation of counterions along short segments of the DNA chain. The concentration and ion strength dependencies are discussed in terms of intermolecular interactions which are considered responsible for the existence of structure in DNA solutions.
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Affiliation(s)
- S Bone
- Institute of Molecular and Biomolecular Electronics, University of Wales, Bangor, Gwynedd, UK
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Bone S, Small CA. Dielectric studies of ion fluctuation and chain bending in native DNA. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1260:85-93. [PMID: 7999800 DOI: 10.1016/0167-4781(94)00181-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The high-frequency dielectric dispersion exhibited by solutions of native DNA is characterised as a function of electrolyte concentration, counterion type, temperature and pH. The data are interpreted in terms of counterion fluctuation along short segments (subunits) of the DNA chain. From calculation of the subunit length from dielectric relaxation time and increment, information is derived regarding the static and dynamic bending of the DNA chain. Activation enthalpies for the ion fluctuation process are obtained from temperature-dependent dielectric data.
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Affiliation(s)
- S Bone
- Institute of Molecular and Biomolecular Electronics, University of Wales, Bangor, Gwynedd, UK
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Bonincontro A, Matzeu M, Mazzei F, Minoprio A, Pedone F. Influence of defects on the electrophoretic, thermodynamic and dielectric properties of a 21 base pair DNA in solution. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1171:288-94. [PMID: 8424952 DOI: 10.1016/0167-4781(93)90067-n] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The thermodynamic and dielectric properties of a 21 base pair DNA have been evaluated and compared with those of samples with some defects. In particular, fragments in which the absence of a phosphate group (nick) or of two nucleotides (gap) causes chain interruptions were studied. Measurements of ultraviolet absorption as a function of temperature at different oligomer concentrations and at various ionic strengths were performed. Dielectric spectroscopy at radiofrequencies (1 MHz-1 GHz) was applied on aqueous solutions of the duplexes at 5 degrees C, where the solutes are thermally stable. Dielectric dispersions with 30-40 MHz characteristic frequencies were defined. The results of melting experiments indicate a thermal destabilization of the oligomers containing the defects. Electrophoretic data and the dielectric results show that the conformations of the nicked and control samples are very similar, while the oligomer with a gap is more compact with a different charge distribution at the ends.
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Affiliation(s)
- A Bonincontro
- Dipartimento di Fisica, Università La Sapienza, Roma, Italy
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Bonincontro A, Giansanti A, Pedone F, Risuleo G. Radiofrequency dielectric spectroscopy of ribosome suspensions. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1115:49-53. [PMID: 1958704 DOI: 10.1016/0304-4165(91)90010-e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Dielectric measurements on different ribosome suspensions were carried out in the frequency range from 10 kHz to 1 GHz. In intact ribosomes two dispersions were detected: one around 100 kHz and the other one in the MHz region. In separated ribosomal subunits and in ribosomes resuspended in a buffer with no magnesium ions (relaxed ribosomes) only the MHz dispersion was observed. Electrical conductivities of the samples at 1 kHz were also measured. The temperature dependence of the two dispersions was investigated and a tentative attribution was proposed.
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Affiliation(s)
- A Bonincontro
- Dipartimento di Fisica, Università degli Studi di Roma, La Sapienza, Italy
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