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- W1620519911 abstract "The organization of the nucleoplasm in Escherichia coli was studied by comparing the results obtained by freeze fracturing and thin sectioning. In addition to exponentially growing cells, we used chloramphenicol-treated cells which show a well-defined nucleoplasm, in the phase-contrast light microscope and can therefore function as a control for treatments necessary for electron microscopy. Two factors were found to determine the visibility of the nucleoplasm in freeze fractures: first, the state of lateral aggregation of deoxyribonucleic and fibrils, which is enhanced by postfixation with OsO4 according to the Ryter-Kellenberger technique; second, the presence of ice crystals. When their formation is prevented by the use of high concentration of freeze-protecting agents, the nucleoplasm appears as a smooth region in cells that have been prefixed. In unfixed cells, however, the freeze-protecting agent causes disappearance of the nucleoplasm by rearrangement of structures within the cell. This observation makes it hard to determine whether the deoxyribonucleic acid in vivo dispersed, as found after glutaraldehyde prefixation, or compact, as after OsO4 prefixation." @default.
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- W1620519911 date "1976-09-01" @default.
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- W1620519911 title "Organization of the nucleoplasm in Escherichia coli visualized by phase-contrast light microscopy, freeze fracturing, and thin sectioning" @default.
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- W1620519911 doi "https://doi.org/10.1128/jb.127.3.1455-1464.1976" @default.
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