“…The HiWo,Ba,,,, medium was either Ca2+-free or contained 10 mgil CaCl, and contained 7.5 mgil ornithine instead of arginine (Menapace and Armato, 1987). Just before use, 50 IU/ml streptomycin (Squibb and Sons S.p.A., Rome), 5.35 pg/ml imipenem monohydrate (Sigma Tau S.p.A., Rome), 5.35 pg/ml sodium cilastatin (Sigma Tau), and 250 ngiml fungizone (Mascia-Brunelli S.p.A., Milan) were added to the medium.…”