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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Visualization and exact molecular weight determination of a Rhizobium meliloti megaplasmid.

The entire DNA of Rhizobium meliloti MVII /1 cells was isolated preparatively by gentle lysis and sucrose gradient centrifugation. Fractions of the sucrose gradient were investigated by electron microscopy. We found intact megaplasmids in supercoiled and relaxed form and total chromosomes. The length of the megaplasmid could be measured, which allowed an exact determination of the molecular weight. We found a length of 0.48 +/- 0.019 mm equivalent to a molecular weight of about 1000 X 10(6).[1]


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