I prepared them on May, 2016. Still I can use them to make PBS.
A one-year shelf-life is reasonable, assuming you prepared the solution in a sterile and aseptic method and environment.
You may want to pH the solution if you had originally prepared them to a specific pH... pH will change over time.
As long as your stock solutions are sterile and perfectly sealed, you can use them as long as you wish.
Which is suitable for use with Python? MySQL or SQL Server? What is your suggestion?
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