Antibiotic	Stock concentration	Final concentration
Ampicillin	100 mg ml-1	100 µg ml-1
Gentamicin	15 mg ml-1	15 µg ml-1
Kanamycin	50 mg ml-1	50 µg ml-1
Chloramphenicol	15 mg ml-1	15 µg ml-1
Tetracycline	5 mg ml-1	15 µg ml-1