Perhaps you should try some spelling variations:
significantly improved » significantly increased (Expand Search)
significantly lower » significantly higher (Expand Search)
improved decrease » improved urease (Expand Search), marked decrease (Expand Search)
lower decrease » larger decrease (Expand Search), linear decrease (Expand Search), teer decrease (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( significantly improved decrease ) OR ( significantly lower decrease )).