Abstract:To improve the transformability of stable protoplast type L‐forms of Proteus mirabilis for recombinant plasmid DNA, conditions for efficient electrotransformation were explored. Exposing cells from the exponential phase of growth at a density of 6−8 × 109/ml in electrotransformation buffer having a conductivity of 1.4 mS/cm to a field strength of 6.5 kV/cm for a mean pulse duration time of 1.2 ms reproducibly yielded transformation efficiencies in the order of 5 × 104 transformants per μg of DNA. Compared to t… Show more
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