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• W2077884220 abstract "Electric parameters, osmolality, temperature, and pH of the suspending medium and the growth phase of cells, etc., are known to influence the efficiency of the pulsed electric field (PEF)-induced DNA transfection of cells. PEF-induced transfection of Escherichia coli JM105 by plasmid DNA PUC18, PUC19, PBR322, and PMSG has been used as a model system to establish quantitative relationships between these parameters and transfection efficiency. The main findings are summarized for experiments using unipolar square wave PEF. (a) For a given field strength (up to 6 kV/cm), the transfection efficiency (TE) was linearly dependent on the pulse width (up to 1 ms). (b) When field strength is fixed, Log [TE] correlated with the number of pulses applied. Similarly, when field duration was fixed, Log [TE] correlated with the number of pulses. (c) In the absence of MgCl2, TE showed a maximal value at 50 mM sucrose and was reduced by several fold at lower and higher sucrose concentrations. Cell survival was nearly constant in the range 1-300 mM sucrose. (d) E. coli in the early and mid-exponential growth phases was more susceptible to PEF for DNA transfection than it was in the stationary phase. (e) For a given set of electric parameters, TE was the highest at neutral pH and was greatly reduced at acidic and alkaline pH. (f) Increasing the temperature from 0 to 37 degrees C resulted in the reduction of TE by three orders of magnitude. This could reflect a rapid shrinking of pores at higher temperatures. (g) TE was inversely proportional to the square of the size of the plasmid DNA. By adjusting the above parameters to optimize transfection, a TE of 1010 1microg-1 DNA (PUC18) has been recorded. Further improvement in percent cell transfection may be expected by a more exhaustive search of conditions than the present study has done." @default.
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• W2077884220 date "1992-07-01" @default.
• W2077884220 modified "2023-09-30" @default.
• W2077884220 title "Study of mechanisms of electric field-induced DNA transfection. III. Electric parameters and other conditions for effective transfection" @default.
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• W2077884220 doi "https://doi.org/10.1016/s0006-3495(92)81580-1" @default.
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