The first light-induced ESR signals of plant photosynthetic material were discovered in 1954
by Commoner et al.[238]. Subsequent work [81,239—241] revealed two signals, a narrow …

One possible source of information about the primary reactions of photosynthesis is a light-
induced transient ESR signal. Such transient ESR signals have been observed to have an …

The technique of simultaneous optical and electron spin resonance spectroscopy has been
used to show that the ratio of light-induced spins in the esr signal I to bleached P700 species …

Purified Photosystem I particles from spinach when reduced with 10 mM dithionite at pH 9
exhibited a 50% light reversible-ESR Signal 1 (P-700+) at about 10 K. It was possible to …

We have reported evidence that the light dependent narrow EPR signal in photosynthetic
material is due to the photooxidized form of photoconverter P700 (Beinert et al., 1962). If this …

Fig. 2. Spectrum of irreversible absorption changes at T= 110 K (oee). Spectrum of
reversible absorption changes of X-320 at 2950K according to [7] computed on the basis of …

The interaction EPR split signals from photosystem II (PSII) have been reported from the S0,
S1, and S3 states. The signals are induced by illumination at cryogenic temperatures and …

After a 500 μs laser flash a 120 μs phase in the decay of delayed fluorescence is visible
under a variety of circumstances in spinach chloroplasts and subchloroplast particles …

Quantitative determinations were made of the number of spins responsible for the sharp, fast
decaying EPR signal induced by light in photosynthetic material. The species resposible for …

We have investigated the effects of temperature on the formation and decay of the light-
induced multiline EPR signal species associated with photosynthetic oxygen evolution …