Table 1. Results of pDNA isolation. Isolation steps: AL—alkaline lysis, silica—binding with silicon dioxide, GF—gel filtration, IPA—isopropanol precipitation, Qiagen kit—Qiagen plasmid maxi kit. OD₂₆₀/OD₂₈₀ is the ratio of optical densities of DNA solutions at 260 nm and 280 nm.