Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids

Burkardt HJ, Mattes R, Pühler A, Heumann W (1978)
J Gen Microbiol 105(1): 51-62.

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DNA of the R plasmids RP1, RP4 and RP8 was isolated from various hosts. The lengths of these plasmid molecules were determined by electron microscopy: RP1 and RP4 were about 19 micron long, RP8 measured 31 micron. An RP4 plasmid mutant, designated RP4a, was isolated from Escherichai coli; it was about 1 micron shorter than normal RP4 DNA. To investigate the molecular relationship between RP4, RP4a and RP8 DNAs of these plasmids were partially denatured and examined in the electron microscope. Measurements of the length and denaturation pattern of the DNA molecules were used to construct physical maps. A new computer program was devised for the alignment of the circular molecules, and the effect of variations of different parameters on the reliability of the program was tested. A comparison of the denaturation pattern of RP4 and RP8 indicated that RP8 was composed of total RP4 plus an additional DNA fragment. The RP4a mutant plasmid could be defined as a deletion mutant with loss of 1 micron DNA.
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Burkardt HJ, Mattes R, Pühler A, Heumann W. Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids. J Gen Microbiol. 1978;105(1):51-62.
Burkardt, H. J., Mattes, R., Pühler, A., & Heumann, W. (1978). Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids. J Gen Microbiol, 105(1), 51-62. doi:10.1099/00221287-105-1-51
Burkardt, H. J., Mattes, R., Pühler, A., and Heumann, W. (1978). Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids. J Gen Microbiol 105, 51-62.
Burkardt, H.J., et al., 1978. Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids. J Gen Microbiol, 105(1), p 51-62.
H.J. Burkardt, et al., “Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids”, J Gen Microbiol, vol. 105, 1978, pp. 51-62.
Burkardt, H.J., Mattes, R., Pühler, A., Heumann, W.: Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids. J Gen Microbiol. 105, 51-62 (1978).
Burkardt, Hans Joachim, Mattes, R., Pühler, Alfred, and Heumann, W. “Electron microscopy and computerized evaluation of some partially denatured group P resistance plasmids”. J Gen Microbiol 105.1 (1978): 51-62.
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