A single โคโลนี that appeared after two to three days was cultured in 3 ml of อาหาร LB. 2 ml of the culture
solution that reached the stationary phase was added to 200 ml of
อาหาร LB, followed by culture with shaking at 180 rpm. The
culture solution in which OD550 was 0.5 to 1.0 was centrifuged
(4,000xg, 4°C, 10 min), and the precipitate was washed with
sterile water three times. The amount of sterile water was 200 ml
in the first wash and 100 ml in the second wash and in the third
wash. The washed precipitate was suspended in 2 ml of 100
glycerol. The สารแขวนลอย was dispensed into microcentrifugation
tubes by 50 ytl, frozen with liquid nitrogen, and preserved as
อะโกรแบคทีเรียม competent cells at -80°C.
[0057]
5. 2 อะโกรแบคทีเรียม การทรานสฟอร์ม by อิเลคโทรพอเรชัน
0.5 ytg of the DNA was added to the competent cells, and
the mixture was placed into a cuvette (2-mm gap). Thereafter, อิเลคโทรพอเรชัน was performed under the following สภาวะ.