Effect of Different Operational Parameters on Bio-degradation of Chicken Feathers by Aspergillus niger: Investigation Under Submerged Fermentation Process: Parameters on Bio-degradation of Chicken Feathers. Pakistan Journal of Scientific & Industrial Research. 2020;63(2):71-76. doi:10.52763/PJSIR.BIOL.SCI.63.2.2020.71.76