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Comparison among patterns of macromolecular synthesis in Escherichia coli B/r at growth rates of less and more than one doubling per hour at 37 degrees C.

ABSTRACT

In Escherichia coli B/r, the relationship between the patterns of chromosome replication and of synthesis of envelope components differs at various growth rates. At growth rates greater than 1.0 doubling per h at 37 degrees C, the average mass and age at initiation of rounds of chromosome replication are similar to those at increase in incorporation of precursors into a major outer membrane protein and phosphatidylethanolamine. At growth rates less than 1.0 doubling per h at 37 degrees C the average mass and age at increase in the synthesis of these envelope components differ from those at initiation of chromosome replication. The average cell mass per chromosomal origin at initiation of rounds of chromosome replication is not a constant and varies between growth rates greater and less than 1.0 doubling per h.

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