M34. Nitrate Broth, Enriched (CDC) Infusion broth 25 g KNO3 (nitrite-free) 2 g Distilled water 1 liter
Dispense 4 ml portions into 13 x 100 mm tubes with inverted Durham tubes. Autoclave 15 min at 121°C. Final pH, 7.3 ± 0.2.
M35. Oxidative-Fermentative (OF) Test Medium Base Peptone 2 g NaCl 5 g K2HPO4 0.3 g Bromthymol blue 0.03 g Agar 2.5 g Distilled water 1 liter
Heat with agitation to dissolve agar. Dispense 3 ml portions into 13 x 100 mm tubes. Autoclave 15 min at 121°C.Cool to 50°C; pH, 7.1.
Carbohydrate stock solution. Dissolve 10 g carbohydrate in 90 ml distilled water. Sterilize by filtration through 0.22 µm membrane. Add 0.3 ml stock solution to 2.7 ml base in tube. Mix gently and cool at room temperature.Inoculate tubes in duplicate. Layer one tube with sterile mineral oil. Incubate 48 h at 35°C.For use with halophilic Vibrio spp., add NaCl to a final concentration of 2-3%.
M36. Selenite Cystine Broth Medium 1 (modification of Leifson's formulation for selenite broth)