L.S.
I have measured operational quantum yields of charge separation
[QY-IIe; variable fluorescence/maximum fluorescence] and oxygen production
[QY-O2; oxygen production/(light intensity x absorption cross section)] at
increasing light intensities for a number of microalgae. My results show, as
might be expected, that both the QY-IIe and QY-O2 decrease with increasing
light intensities. The ratio of QY-O2/QY-IIe remains more or less constant at
subsaturating light intensities. However at higher light intensities, QY-O2
declines faster than QY-IIe, leading to a logarithmical decrease in
QY-O2/QY-IIe with increasing light intensity. I would like to get some
suggestions about what might cause this discrepancy. Could this be
caused by the Mehler-peroxidase reaction? Also, I would welcome some
references to studies on quantum yields; especially studies on the linkage of
quantum yields of charge separation, oxygen production and carbon fixation.
Thanks,
Inez Flameling
