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| Content Provider | Springer Nature Link |
|---|---|
| Author | Kveder, M. Rakoš, R. Gavella, M. Lipovac, V. Pifat, G. Pečar, S. Schara, M. |
| Copyright Year | 2004 |
| Abstract | The perturbation of the physical state of cell membranes triggered by an external oxidative stimulus has been studied with sperm cells which were chosen as a model system. Electron paramagnetic resonance (EPR) spectroscopy was applied and three different nitroxides bearing a paramagnetic group on the 5th, 7th and 13th carbon of the stearic acid acyl chain were used to probe different regions of the membrane. The theoretical simulations of the experimental spectra indicate distinct domains in the intact cell plasma membrane where local steric constraints impose different degrees of motional averaging experienced by the reporter group. Upon the external oxidative stimulus the spectral changes were proportional to the accumulated oxidation products and were detected only for the reporter group residing close to the lipid-water interface. The EPR spectra reveal that the motion of the reporter group has slowed down in the oxidized cells and that the oxidatively modified membrane shows up as a more rigid structure as compared with the native state. The results also indicate that the oxidation-induced spectral changes are supressed in the presence of gangliosides. |
| Starting Page | 77 |
| Ending Page | 86 |
| Page Count | 10 |
| File Format | |
| ISSN | 09379347 |
| Journal | Applied Magnetic Resonance |
| Volume Number | 27 |
| Issue Number | 1-2 |
| e-ISSN | 16137507 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2004-01-01 |
| Publisher Place | Vienna |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Solid State Physics Spectroscopy/Spectrometry Physical Chemistry Organic Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics |
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