As we all know,vanillin is a kind of crystalline powder.In your article Amyloid-β Deposition and Olfactory Dysfunction in an Alzheimer's Disease Model Olfactory behavior test ,you mentioned that Vanillin and ethyl acetate were diluted to 1 × 10-5 and 1 × 10-6 with distilled water. ethyl acetate is liquid easy to dilute,while vanillin is powder,what's the meaning of diluting to that concentration？thanks a lot for answering me.