IUBio GIL .. BIOSCI/Bionet News .. Biosequences .. Software .. FTP

quantum yields

Flameling, Inez flameling at cemo.nioo.nl
Mon May 15 06:22:25 EST 1995

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. 

Inez Flameling

More information about the Photosyn mailing list

Send comments to us at archive@iubioarchive.bio.net