Electron tunneling in ferritin and associated biosystems

Macroscopic Resonant Tunneling of Magnetization in Ferritin

We report experimental evidence of macroscopic quantum tunneling in antiferromagnetic particles. The zero-field maximum in the dependence of the magnetic relaxation rate on the magnetic field in ferritin has been observed. This observation provides a new insight into the origin of the nonmonotonic field dependence of the blocking temperature reported recently by Gider et al. [J. Appl. Phys. 79,...

Electron tunneling and superconductivity.

Electron tunneling pathways in proteins.

Long-range electronic interactions between electron donors and acceptors in proteins depend on the structure of the intervening polypeptide. Several methods have been developed for calculating these weak couplings. New challenges in protein electron-transfer research include identifying the role of protein dynamics, and characterizing multistep tunneling over very long distances.

Electron tunneling in protein crystals.

The current understanding of electron tunneling through proteins has come from work on systems where donors and acceptors are held at fixed distances and orientations. The factors that control electron flow between proteins are less well understood, owing to uncertainties in the relative orientations and structures of the reactants during the very short time that tunneling occurs. As we report ...

Electron tunneling in biological molecules*

Electron transfers in photosynthesis and respiration commonly occur between protein-bound prosthetic groups that are separated by large molecular distances (often greater than 10 AÊ ). Although the electron donors and acceptors are expected to be weakly coupled, the reactions are remarkably fast and proceed with high speci®city. Tunneling timetables based on analyses of Fe/Cu to Ru electron-tra...