The paper for the March 25 meeting is:
Membrane-inlet mass spectrometry reveals a high driving force for oxygen production by photosystem II
Dmitriy Shevelaa, Katrin Beckmann, Jürgen Clausen, Wolfgang Jung, and Johannes Messinger
3602–3607 PNAS March 1, 2011 vol. 108 no. 9 doi/10.1073/pnas.1014249108