In most of the experiments we used U-937 (human monocyte lymphoma) cells. This cell line was chosen because the response of U-937 to electric pulses has been extensively investigated by several groups in the field including ours5 (link)6 (link)20 (link)24 (link)29 (link)30 (link). U-937 and HPAF-II (human pancreatic adenocarcinoma) cells were obtained from ATCC (Manassas, VA). U-937 grow in suspension and were cultured in RPMI-1640 medium (Sigma-Aldrich, St. Louis, MO). HPAF-II grow in a monolayer and were kept in EMEM medium (ATCC). Both growth media were supplemented with L-glutamine (ATCC), 10% (v/v) fetal bovine serum (Atlanta Biologicals, Norcross, GA), 100 U/ml penicillin and 0.1 mg/ml streptomycin (Mediatech Cellgro, Herdon, VA).
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