FCCT Biochemistry Lab:M9 medium/minimal: Difference between revisions
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'''M9 stock solution''' (10x) is: | '''M9 salts stock solution''' (10x) is: | ||
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| 60 g Na<sub>2</sub>HPO<sub>4</sub> x 7 H<sub>2</sub>O | | 60 g Na<sub>2</sub>HPO<sub>4</sub> x 7 H<sub>2</sub>O |
Latest revision as of 01:34, 27 March 2008
We used to prepare the plain M9 medium as follows:
900 ml sterile water |
100 ml M9 salts stock solution |
1 ml autoclaved 1 M MgSO4 |
0.1 ml autoclaved 1 M CaCl2 |
M9 salts stock solution (10x) is:
60 g Na2HPO4 x 7 H2O |
30 g KH2PO4 |
5 g NaCl |
10 g NH4Cl |
add water to 1000 ml and autoclave |
Notes
Note 1: salts that are added last often tend to precipitate. I didn't bother about it too much as obviously it didn't influence bacterial growth. There might be a way to avoid precipitation (eventually adding magnesium and calcium first) but I didn't investigate this in detail.
Note 2: The M9 stock solution here is essentially as in the M9 salts recipe just that the concentration of Na-phosphate is not exactly the same - see the Talk section therein.