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MATERLALS AND METHODS Microcosms used were tanks, dilution bottles, and test tubes. The tanks were 9-liter cylindrical polypropylene containers 22 cm in diameter and 25 cm high. 906 on May 4, 2020 by guest http://aem.asm.org/ Downloaded fromdoi:10.1128/aem.38.5.906-910.1979 fatcat:cpparjniurchbf7volclqeihb4