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| Content Provider | Springer Nature Link |
|---|---|
| Author | Yevdokimov, Yu. M. Skuridin, S. G. Salyav, V. I. Kats, E. I. |
| Copyright Year | 2016 |
| Abstract | The circular dichroism spectra of liquid-crystalline dispersions obtained by phase exclusion of linear double-stranded DNA molecules from aqueous saline solutions of polyethylene glycol (120 ≤ C $_{PEG}$ ≤ 300 mg/mL) have been investigated. The formation of liquid-crystalline dispersions at polyethylene glycol concentrations ranging from 120 to 200 mg/mL was accompanied by the emergence of an abnormal negative band in the spectrum of circular dichroism; this is indicative of cholesteric packing of the double stranded DNA molecules in the particles of the dispersion. Liquid-crystalline dispersions formed at PEG concentrations higher than 220 mg/mL and room temperature did not show any abnormal bands in the circular dichroism spectra; this is indicative of hexagonal packing of double-stranded DNA molecules in the particles of the dispersions. Heating of optically inactive liquid crystal dispersions induced a transition of the dispersions into a different state accompanied by the emergence of an abnormal negative band in the spectrum of circular dichroism. This transition is considered within the concept of the transformation of a hexagonal packing of DNA molecules into a cholesteric packing. A qualitative mechanism of such a transition is proposed that is formulated in the terms of the “quasinematic” layers of double-stranded DNA molecules that change their spatial orientation under the competing influences of the osmotic pressure of the solvent, orientational elasticity of the cholesteric packing, and thermal fluctuations. |
| Starting Page | 351 |
| Ending Page | 360 |
| Page Count | 10 |
| File Format | |
| ISSN | 00063509 |
| Journal | Biophysics |
| Volume Number | 61 |
| Issue Number | 3 |
| e-ISSN | 15556654 |
| Language | English |
| Publisher | Pleiades Publishing |
| Publisher Date | 2016-08-16 |
| Publisher Place | Moscow |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | particles of liquid-crystalline DNA dispersions circular dichroism abnormal optical activity hexagonal and cholesteric packing of DNA molecules “quasinematic” layers the transition from hexagonal to cholesteric packing Biophysics and Biological Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biophysics |
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