# 172: CYTOPHAGA (marine) MEDIUM ## Main sol. 172 1 g Yeast extract (Difco) 1 g Tryptone (Difco) 24.7 g NaCl 0.7 g KCl 6.3 g MgSO4 x 7 H2O 4.6 g MgCl2 x 6 H2O 1.2 g CaCl2 x 2 H2O 0.2 g NaHCO3 15 g Agar (Difco) 1000 ml Distilled water 1. Adjust pH to 7.2. Sodium bicarbonate and calcium chloride are autoclaved separately, each in a small volume of distilled water.