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First of all thanks for your reply.
Well I am trying to grow Helio. mobilis. I got a medium in which it grows but the problem is it contains alot of yeast. The reason why I don't want that is because I want to label the Nitrogens with 15N and since yeast already has a nitrogen source I would prefer not to have any yeast in my medium in order to get a high amount labeled.
Maybe there's a preservative in something.