Posted by **micro** on Monday, March 14, 2011 at 11:48pm.

How do i plot a semi log graph for OD vs. time? The values for OD are under 1

- microbiology -
**Adam**, Monday, March 14, 2011 at 11:51pm
adjust ur scale and use E-ve

numbers

try using ln instead of logs

dont be afriad to start ur graph later...instead of at 0 or 1

- microbiology -
**MathMate**, Monday, March 14, 2011 at 11:59pm
There are semi-log graph papers that you can use.

The time scale is probably linear, and the diameter is in log scale (or the other way round).

The log scales are in cycles of 10, in your case, would be 0.001 to 0.01, 0.01 to 0.1, 0.1 to 1, etc.

If you don't have semi-log graph paper, then you can take log and plot the value of log. The cycles can be adjusted accordingly.

See, for example:

http://course1.winona.edu/sberg/307s09/Labs/documents/SemiLog_files/SemiLog_22632_image001.gif

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