This is the "Miller" formulation of LB with 10 g NaCl per liter (1% w/v). Another common formulation has only 5 g NaCl per liter (0.5% w/v)! They are NOT interchangeable.
If you are performing sacB counter-selection, you may need to use even lower salt concentrations.
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To make "soft" agar for phage studies, use only 7 g agar per liter.
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To make "soft" or "top" agar for phage studies, use only 7-8 g agar per liter.