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[Electron tunneling between photoinduced paramagnetic centers in melanin]
Biofizika
|March 1, 1980
Summary
The decay of paramagnetic centers in irradiated melanin follows a logarithmic time pattern. Electron tunneling from anion-radical sites explains this phenomenon, indicating reversible photoinduced and thermal electron transfer processes.
Area of Science:
- Biophysics
- Materials Science
- Radiation Chemistry
Context:
- Melanin pigment derived from Cladosporium transchelii K-1.
- Irradiation-induced paramagnetic centers (PC).
Purpose:
- To investigate the decay kinetics of paramagnetic centers in irradiated melanin.
- To elucidate the mechanism of electron transfer processes in melanin.
Summary:
- Paramagnetic center concentration in irradiated melanin decays linearly with the logarithm of time.
- Temperature dependence studies suggest long-range electron tunneling from thermally excited anion-radical sites.
- Photoinduced and thermal electron transfer in melanin are reversible processes.
Impact:
- Provides insights into the electronic properties and stability of melanin.
- Contributes to understanding radiation effects on biological pigments.
- Suggests potential applications in areas requiring stable, photoresponsive materials.