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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): Pseudo-color scanning electron microscopic image of Escherichia coli cells that are supported on the surface of nanofibrous cellulose. The porous matrix is stable under a wide variety of extreme culture conditions and can be used as a versatile platform for developing solidified media for growth of extremophiles. (See related article on page 4616.)


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