Description_x000D_ General description_x000D_ Subunit molecular weight: ~90,770_x000D_ Composed of six subunits with total molecular weight: ~544,620_x000D_ Packaging_x000D_ 100 mL in glass bottle_x000D_ Biochem/physiol Actions_x000D_ Urease activity has been shown to be inhibited by benzpyrene following exposure to light. This inhibition was due to the effect of benzpyrene on urease′s sulfhydryl groups._x000D_ Unit Definition_x000D_ One micromolar unit will liberate 1.0 μmole of NH3 from urea per min at pH 7.0 at 25 °C. It is equivalent to 1.0 I.U. or 0.054 Sumner unit (1.0 mg ammonia nitrogen in 5 minutes at pH 7.0 at 20 °C)