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Cover Picture: Sub-Picosecond Mid-Infrared Spectroscopy of Phytochrome Agp1 from Agrobacterium tumefaciens (ChemPhysChem 11/2007)
The cover picture shows a green, flowering potato plant. Greening and flower induction of plants are triggered by phytochromes, photoreceptors which are ubiquitous in plants but were also found in bacteria and fungi. The primary photoreaction of the bilin chromophore launching the signal cascade takes place on the picosecond timescale. In the article by Schumann et al. on page 1657, ultrafast infrared spectroscopy was used to monitor structural dynamics of a phytochrome from the soil bacterium Agrobacterium tumefaciens. This phytochrome incorporates the ancient type of chromophore, biliverdin. The potato plant was painted in water colour by the German artist Katrin Peper (http://www.katrin-peper.com) and provided with kind permission. The International Society for Microbial Ecology is acknowledged for the image of an Agrobacterium tumefaciens colony.