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Aunt Yersinia

How To Ask For Reagents

Greetings, I’m a research student and I’m having a lot of trouble in finding the right antibodies for my study, because I need both monoclonal and polyclonal. And I need to start addressing some other international scientists. The problem is that I don’t know how to address the situation. If they indeed have antibodies that…

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Am I Damaging My E. coli by Spinning at High Speeds?

Dear Aunt Yersinia, A very annoying postdoc in our group keeps telling me off for spinning E.coli at 13K in a tabletop centrifuge. The postdoc claims that high speed damages cytoskeleton and this will reduce my transformation frequency. But I don’t believe her as the cells are cushioned by water during centrifugation. Can you tell…

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Help: My Gal Promoter Doesn’t Work

Dear Aunt Yersinia, I work with a yeast vector where my gene is under a Gal promoter. My boss told me to grow yeast in medium with sucrose, and then add galactose to induce the promoter. I did it, but my protein is not induced; the Western blot is empty. I sequenced a part of…

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To Pour or to Spread, This is the Question

Dear Aunt Yersinia, What are advantages and disadvantages of pour and spread plates? Antonio   It is refreshing to see such wisdom – knowing that there are at least two methods of pouring plates – in a young man. While all molecular biologists know or have at least seen a ”spread plate” aka Petri dish…

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