Perhaps you should try some spelling variations:
"50 ng_ decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 mg_ decrease" (Expand Search), "10 ng_ decrease" (Expand Search), "5 ng_ decrease" (Expand Search), "50 nsg_ decrease" (Expand Search), "50 μg_ decrease" (Expand Search), "50 _g_ decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 nsg decrease" (Expand Search), "50 μg decrease" (Expand Search), "50 _g decrease" (Expand Search)
"50 _g decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 mg decrease" (Expand Search), "50 μg decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 μ decrease" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("50 ng decrease") OR ("50 _g decrease"))) OR ("50 ng_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 ng decrease\") OR (\"50 _g decrease\"))) OR (\"50 ng_ decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 ng decrease ) OR ( 50 _g decrease ))) OR ( 50 ng_ decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 ng decrease") OR ("50 _g decrease"))) OR ("50 ng_ decrease"))) OR ("50 n decrease"))*.