About the Cover
Cover illustration: Reflected light image of the lower surface of a Phaseolus vulgaris leaf after exposure to 250 nmol mol-1 ozone for 3h is superimposed on an image of the operating quantum efficiency of PSII photochemistry in the leaf at a photon flux density of 270 mmol m-2 s-1. The dashed lines indicate the positions of the stomata. (See Leipner et al., pp. 1689-1696.)
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