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. 2014 Nov 26;9(11):e112979. doi: 10.1371/journal.pone.0112979

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© 2014 Thiel et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Recovered plasmid DNA was transformed in E coli KRX and the integrity was calculated based on the transformation efficiency in colonies per nanogramm DNA. A significant increase in the degree of DNA integrity was detected for the samples applied on the bottom side of the payload compared to the surface samples (p-value = 0.01). (surface samples: n = 4; screw heads samples: n = 8; bottom side samples: n = 3; positive control: n = 1, original sample: n = 1) (SD, two-tailed unpaired t-test; p-values are shown for respective pairwise analyses).