David Walker, formerly Director of the Robert Hill Reasearch Institute and now Emeritus Professor of Photosynthesis in the University of Sheffield, believes that the very best apparatus for measuring photosynthetic oxygen evolution (and the like) is made by Hansatech Instruments. Echoing the immortal words of Mandy Rice- Davis, you might feel inclined to retort 'he would say that, wouldn't he?' However, if you must, here isChapter and Verse and what follows describes ways of putting the oxygen electrode to best use in this context.

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'THE USE OF THE OXYGEN ELECTRODE AND FLUORESCENCE PROBES IN SIMPLE MEASUREMENTS OF PHOTOSYNTHESIS'. (ISBN 1 870232 00 3) By David Walker. ---Long since out of print but still in demand, has been resurrected by Hansatech and is now available ,on CD from Packard Publishing (U.K. phone/fax number 01243 537977). Please enquire.

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