Main Reaction: Ammonium sulfate >> NH4+

Reference: PubMed ID: 26153501
Authors: Meissner L, Kauffmann K, Wengeler T, Mitsunaga H, Fukusaki E, Büchs J
Title: Influence of nitrogen source and pH value on undesired poly(γ-glutamic acid) formation of a protease producing Bacillus licheniformis strain.
Published: 2015 Sep

Ammonium sulfate --> NH4