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ultraman

Member Since 15 Jan 2010
Offline Last Active Jul 18 2012 05:19 AM
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Topics I've Started

Drop plate technique

18 July 2012 - 05:14 AM

After making serial dilution and the solution will be plated out.

For example, I prepare dilution like this.

10^-1
10^-2
10^-3
10^-4
10^-5

Change pipette tip when transferring mixtures to the next dilution in each step.
However, I'd like to know that Can I use the same pipette tip when plating out from high to low dilutions or not (from 10^-5 to 10^-1)? The number of bacteria will be the real number or not?

Thanks for answer.

DMSO and MTT assay

07 June 2012 - 12:29 AM

Dear all,

Thank you for all reply.

Today, I'd like to ask about DMSO sulution that use for mtt assay in the final step. I'd like to know that which concentration of DMSO use to dissolved formazan crystal product before measuring the absorbance.

How to prepare the MTT reagent? For the best solution. It should be filter-sterlized or not. I should place it overnight for completely dissolve or not.  

best regard,

ultra_man

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