CREATE TABLE table_16083989_1 (voges_proskauer VARCHAR2, citrate VARCHAR2)

What are the results for testing the species with voges-proskauer when citrate yields a positive result?
SELECT voges_proskauer FROM table_16083989_1 WHERE citrate = "Positive"
SELECT "voges_proskauer" FROM "table_16083989_1" WHERE "Positive" = "citrate"