The efficiency in selective extraction of photosystem (PS) 2 oxygen evolving complexes was compared among seven detergents. These were applied to thylakoid membranes of the thermophilic cyanobacterium Synechococcus elongatus. Used were five non-ionic detergents with one ionic and one zwitterionic for comparison. To compare the suitability and efficiency of the detergents the following properties of the extracts were examined: maximum rate of oxygen evolution with various electron acceptors, the relative variable fluorescence (FV/FM), the contamination of the extract with photosystem (PS) 1, and the status of the electron acceptor side of PS2 reaction centre. None of the detergents yielded a highly selective extraction of the PS2 complexes (negligible contamination with PS1) which would simultaneously display a high photochemical activity and high structural intactness. Heptylthioglucoside and dodecylmaltoside yielded the nearest approximation to the optimum result. Kinetic fluorometry was applied here for the first time to characterize the functional and structural properties of PS2 particles from cyanobacteria. and E. Šetlíková ... [et al.].
On the basis of two new publications associated with Richard Weiner the man and his work, i.e. an edition of Weiner’s French correspondence with members of the French group Le Grand Jeu, published under the title Correspondances croisées 1927–1937 (eds. Erika Abrams and Billy Dranty) and a collection of early prose works compiled by Michal Jareš (The Broken Thread and Other Prose), this article reflects on selected issues, problems and themes involving textology, editology and text interpretation.