How to prepare a stock solution of α-Amylase from Porcine Pancreatic powder from Megazyme with an activity comparable to a 1000U/mg stock solution of α-Amylase from Porcine Pancreas from Sigma-Aldrich? Specifically, what is the appropriate concentration and volume of the α-Amylase powder that should be dissolved in a suitable solvent to prepare the stock solution? Additionally, what factors should be taken into account when comparing the activity of the new α-Amylase stock solution to the old one, given that the former has a different activity unit (1000 U/mg) compared to the latter (75,000 U/g)

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