PENGARUH KONSENTRASI AMONIUM SULFAT TERHADAP AKTIVITAS PROTEASE EKSTRASELULER Lactobacillus plantarum B1765 ISOLAT BEKASAM THE EFFECT OF AMMONIUM SULPHATE CONCENTRATION TOWARD EXTRACELLULER PROTEASE ACTIVITY OFLactobacillus plantarum B1765 OF BEKASAM ISOLATE - PURI PANGASTUTI PANGGAYUH, DIAH (UNESA Journal of Chemistry, 1970)