How many E. coli = 1 O.D. unit?

P. Friedl di58 at
Wed Jun 28 09:06:28 EST 1995

In article <3sb250$nbu at>, "Edward K.L. Chan" <echan at> says:
>Hi netters,
>   I wonder if someone may be able to provide a reliable formula to calculate
>the number of DH5-alpha or XL1-Blue based on O.D. measurement.  Thanks in advance.

with E.coli an OD (420nm) of 0.06 corresponds to 2x10E7 cells per ml

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