Cover photograph (Copyright © 2004, American Society for Microbiology. All Rights Reserved.): Behavior of the dye neutral red at a butanol-water interface. The image was rotated 90 degrees clockwise, with water on the left and butanol on the right. (Photo by Paul Straight and Esteban Martínez.) (For articles in this issue describing the responses of the bacterium Clostridium acetobutylicum to butanol stress, see pages 1959 and 2006).
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