Ampicillin

50 mg/mL stock

(Final concentration in medium = 50 µg/mL)

Lasts up to 4 weeks in poured agar at 4C

0.5 g in 10 mL water

filter sterilize

1 mL aliquots (enough for 1 L medium)

0.4 mg/mL for QSB

Make 35 mL: 0.28 mL 50 mg/mL stock

35 mL sterile water

(filter sterilize if any doubt about sterility)

48 0.7 mL aliquots

Can also use carbenicillin