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A method for measuring the action spectra of photosynthetic oxygen evolution in unicellular algae is described. This involves embedding the cells in a thin strip of agarose gel. These gel strips can then be used for action spectrum measurements, with a bare platinum electrode of the Haxo and Blinks type in the same way as measure· ments are made with a piece of multicellular algal thallus.

The Action Spectrum of Photosynthesis in Euglena Gracilis at Different Stages of Chloroplast Development