Perhaps you should try some spelling variations:
significantly improved » significantly increased (Expand Search)
significantly largest » significantly larger (Expand Search), significantly less (Expand Search), significantly affect (Expand Search)
improved decrease » improved urease (Expand Search), marked decrease (Expand Search)
largest decrease » larger decrease (Expand Search), marked decrease (Expand Search)

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

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