Bioruffo
Molecular Biology protocols, utilities and oddities
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Excel can sometimes be a heavy yet effective substitute for coded programs. I've used it this way for some time now, and I'm quite enjoying it. I'm planning to pass many works to Python as soon as I learn it well enough.
 
Transformation Efficiency Assistant - a spreadsheet that will guide you from experimental design to interpretation of results.
 
...many many more, allow me time to write how to use them...