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| Content Provider | Springer Nature Link |
|---|---|
| Author | DeRouchey, J. Netz, R. R. Rädler, J. O. |
| Copyright Year | 2005 |
| Abstract | The internal structure of DNA-polycation complexes is investigated by synchrotron small-angle X-ray scattering (SAXS). Hexagonal packing of DNA is observed for DNA complexed with poly-L-lysine (PL), poly-L-arginine (PA), spermine (Sp), and linear and branched polyethyleneimine (lPEI and bPEI, respectively). Variations in the internal spacings and degree of long-range ordering are dependent on both polycation type and concentration of added salt. With increasing concentration of monovalent salt, a discontinuous phase transition is observed from compact to loose bundles and finally to an isotropic network phase. This salt-induced melting transition was found to be universal for all polyplexes studied and is in quantitative agreement with a simple free energy model based solely on electrostatic and entropic contributions. Using the osmotic stress method, bulk modulus (K) is measured for PL-DNA and PA-DNA polyplexes at various salt concentrations. With increasing osmotic force, we show that the salt-induced melting transition is shifted and compression in the loose bundle regime is in qualitative agreement with our model. |
| Starting Page | 17 |
| Ending Page | 28 |
| Page Count | 12 |
| File Format | |
| ISSN | 12928941 |
| Journal | The European Physical Journal E |
| Volume Number | 16 |
| Issue Number | 1 |
| e-ISSN | 1292895X |
| Language | English |
| Publisher | EDP Sciences |
| Publisher Date | 2005-01-31 |
| Publisher Place | Les Ulis |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Biotechnology Physical Chemistry Polymer Sciences Surfaces and Interfaces, Thin Films Nonlinear Dynamics, Complex Systems, Chaos, Neural Networks Soft Matter, Complex Fluids Biophysics/Biomedical Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology |
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