Modified COMBO Medium



Modified COMBO Medium Recipe

Directions 
This modified medium was derived from Guillard and Lorenzen's (1972) WC medium. This medium is used to support growth of cyanobacteria, cryptophytes, green algae, and diatoms.

For 1 L Total

1. To approximately 900 mL of dH2O add each of the components in the order specified while stirring continuously.
2. Adjust pH to 7.8.
3. Bring total volume to 1 L with dH2O.
4. Add vitamins to flask.
5. Do not autoclave medium! Filter sterilize only.
6. Store at refrigerator temperature.


# Component Amount Stock Solution
Concentration
Final Concentration
1 NaNO3 (Fisher BP360-500) 10 mL/L 85.01 g/L 10 mM
2 CaCl2·2H2O (Sigma C-3881) 10 mL/L 36.76 g/L 2.5 mM
3 MgSO4·7H2O (Sigma 230391) 10 mL/L 36.97 g/L 1.5 mM
4 NaHCO3 (Fisher S 233) 10 mL/L 12.6 g/L 1.5 mM
5 Na2SiO3·9H2O (Sigma 307815) 10 mL/L 28.42 g/L 1 mM
6 K2HPO4 (Sigma P 3786) 1 mL/L 8.71 g/L 0.5 mM
7 H3BO3 (Baker 0084) 10 mL/L 24 g/L 3.9 mM
8 KCl (Fisher P 217) 10 mL/L 7.45 g/L 1 mM
9 Algal Trace Elements Solution 10 mL/L    
10 Vitamin B12 1 mL/L    
11 Biotin Vitamin Solution 1 mL/L    
12 Thiamine Vitamin Solution 1 mL/L    
13 CR1 Soil 1 cc