Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger
Figure 2
(a) Production of proteolytic activity and (b) production of keratinolytic activity by A. niger growing on different keratinous substrates (10 g/L). (■) Bovine horn, (∆) chicken feathers, (▲) feather meal, (◆) human hair, and (●) pig hair.