Cultures were maintained on amended
Luria-Bertani agar medium (LB) containing the following (in
grams per liter): Bacto-Tryptone (Difco), 10; yeast extract,
5; NaCl, 5; and Bacto-agar (Difco), 20. The pH was adjusted
to 7.5 with 1 N NaOH before autoclaving. LB, LB amended
with 5 mM L-tryptophan (LBT), and LBT amended with
0.06% sodium dodecyl sulfate plus 1% glycerol (LBTD4; 9)
were used in experiments.
Cultures were maintained on amendedLuria-Bertani agar medium (LB) containing the following (ingrams per liter): Bacto-Tryptone (Difco), 10; yeast extract,5; NaCl, 5; and Bacto-agar (Difco), 20. The pH was adjustedto 7.5 with 1 N NaOH before autoclaving. LB, LB amendedwith 5 mM L-tryptophan (LBT), and LBT amended with0.06% sodium dodecyl sulfate plus 1% glycerol (LBTD4; 9)were used in experiments.
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