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Electrocompetent cells: Difference between revisions
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''Note: When harvesting cells by decanting, be very careful to not disturb the pellet-- this could result in a much lower yield. If necessary, aspirate instead of decant the supernatant. Get someone to show you how to aspirate. Also, if the pellet seems loose, sometimes it is helpful to re-spin the cells down.'' | ''Note: When harvesting cells by decanting, be very careful to not disturb the pellet-- this could result in a much lower yield. If necessary, aspirate instead of decant the supernatant. Get someone to show you how to aspirate. Also, if the pellet seems loose, sometimes it is helpful to re-spin the cells down.'' | ||
*Centrifuge 1: Transfer the cultures to ice-cold centrifuge bottles. Harvest the cells by centrifugation at 1000g (2500 rpm) for 15 minutes at 4°C. Decant the supernantant and resuspend the cell pellet in 500 ml of ice-cold DI water. ''Note: I think this should be done for each of the two 500ml cultures, i.e this is a 1:1 resuspension rather than a concentration by a factor of 2 [[ | *Centrifuge 1: Transfer the cultures to ice-cold centrifuge bottles. Harvest the cells by centrifugation at 1000g (2500 rpm) for 15 minutes at 4°C. Decant the supernantant and resuspend the cell pellet in 500 ml of ice-cold DI water. ''Note: I think this should be done for each of the two 500ml cultures, i.e this is a 1:1 resuspension rather than a concentration by a factor of 2 [[Barry Canton|BC]]''. | ||
*Centrifuge 2 (water): Harvest the cells by centrifugation at 1000g for 20 minutes at 4°C. Decant the supernatant and resuspend the cell pellet in 250 ml ice-cold DI water. | *Centrifuge 2 (water): Harvest the cells by centrifugation at 1000g for 20 minutes at 4°C. Decant the supernatant and resuspend the cell pellet in 250 ml ice-cold DI water. | ||
