The invention of a molecular device that permits the cleavage of water into molecular
oxygen and metabolically bound hydrogen by solar radiation is of paramount importance for …

Cytochrome b559 (Cyt b559), β-carotene (Car), and chlorophyll (Chl) cofactors participate in
the secondary electron-transfer pathways in photosystem II (PSII), which are believed to …

The papers related to the theoretical background and experimental investigations by pulsed
electron double resonance (PELDOR) are reviewed. The main aim of this pulsed ESR …

The physical organic chemistry and spectroscopic features of the ligand phenoxyl are
reviewed. Some well‐characterized metalloproteins known to contain tyrosyl radicals are …

The crystal structure of photosystem II (PSII) at 3.0-Å resolution suggests that titratable
residues on the lumenal side of D1/D2 and PsbO form a polar channel, which might serve as …

The thermophilic cyanobacterium, Thermosynechococcus elongatus, has been grown in the
presence of Sr 2+ instead of Ca 2+ with the aim of biosynthetically replacing the Ca 2+ of the …

Photosynthetic water oxidation by photosystem II is mediated by a Mn4 cluster, a cofactor X
still chemically ill-defined, and a tyrosine, YZ (D1-Tyr161). Before the final reaction with …

The manganese complex (Mn4) which is responsible for water oxidation in photosystem II is
EPR detectable in the S2 state, one of the five redox states of the enzyme cycle. The S2 state …

As part of a project aimed at developing models for photosystem II (PSII) in green plants, we
have prepared a series of model compounds (7, 8, and 13). In these compounds, a …

Magnetic properties of the S1-state manganese cluster in the oxygen-evolving photosystem
II were studied by parallel polarization electron paramagnetic resonance spectroscopy. Dark …