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# DRT

Member Since 19 Feb 2009
Offline Last Active Today, 01:19 AM

### #154404Method of calculating p value for Pearson's correlation coefficient

Posted on 29 April 2013 - 03:37 PM

The formula you have given looks like it should be t=r/Sqrt((1-r^2)/(N—2)) the t statistic for testing if the correlation coefficient is significant, it can then be converted to a p value using the T.DIST function in Excel.

### #145585Calculating enzyme activity

Posted on 20 November 2012 - 11:19 AM

You are on the right track; just go carefully through your units.
The first step is correct to get 3.7x10^-5 M
But this is over 60min so you have 6.17x10^-7 M/min
Then convert to uM/min
To get to enzyme units you need to remember uM is an abbreviation for umol/L so you can multiply out the assay volume to leave umol/min

Your standard curves of enzyme vs OD are important for demonstrating that you have a linear response wrt enzyme concentration.

### #140124Drug recrystallize when i added to DMEM

Posted on 28 August 2012 - 12:36 PM

sometimes disolving in FBS or BSA will help