B997 

COLUMBIA C.N.A. AGAR

Formula 

B997

Ingredients 

gms/lit.

Biopeptone 

Tryptic digest of beef heart 

Corn starch 

Sodium chloride 

Colistin sulphate 

Nalidixic acid 

Agar 

20.00

3.00

1.00

5.00

0.01

0.015

10.00

Final pH (at 25°C) : 7.3 + 0.2

Directions 

Suspend 39 gms. of B997 in 1000 ml. distilled water. Heat to boiling to dissolve the medium completely. Sterilize by autoclaving at 15lbs pressure (121°C) for 15 minutes. Cool to 50°C and aspetically add 5% v/v sterile, defibrinated blood. Mix well and pour into sterile petri plates.

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