The genetic alteration of a cell resulting from the direct uptake, incorporation and expression of exogenous genetic material from its surroundings and taken up through the cell membrane.
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+50
What medical and commercial proteins are made using genetically modified animals?
Recombinant technologies in micro-organisms being used to produce commercial and medically useful proteins like insulin are fairly common.
However some proteins are still produced commercially in ...
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1answer
64 views
How is the exogenous DNA protected from degradation during bacterial transformation?
During transformation, a bacterium can take up DNA from its environment. A small fraction of bacterial species are known to be naturally competent, meaning that they can engage in this sort of ...
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2answers
1k views
Why is PEG important for efficient yeast transformation?
One way to do an yeast transformation is by using lithium acetate, a single-stranded carrier DNA, and PEG (1). I was wondering why is the polyethylene glycol important for the efficient ...
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1answer
20 views
How the concentration of an antibiotic is chosen for YPD medium?
I need to prepare YPD plates containing hygromycin, but I don't know which concentration I can use. I'll select transformants of Hansenula polymorpha.
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1answer
144 views
Sparking during electroporation of plasmid DNA into bacterial cells
During electroporation of bacterial cells (I work with Mycobacterium tuberculosis, but I think this applies to E. coli as well), sometimes I get sparking. I've read this is due to salts present, ...
8
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2answers
5k views
Why is SOC medium recommended for transformations?
In pretty much every transformation protocol I've seen SOC medium is used to grow the bacteria for a short while after the tranformation and before plating.
I've usually substituted LB medium for ...
