Pharmacology deals with the elucidation of molecular and organismal function in relation to chemicals.
Ivan I may refer to  :. Ivan I Debranin , first Archbishop of Ochrid -LRB- 11th-century -RRB-. Ivan I Debranin. Ivan I Debranin. Ivan I of Moscow -LRB- 1288 -- 1340 -RRB- , Prince of Moscow. Ivan I of Moscow. Ivan I of Moscow. Ivan I Crnojevic of Zeta -LRB- r. 1465 -- 1490 -RRB-. Ivan I Crnojevic. Ivan I Crnojevic