BIODEGRADATION OF CHICKEN FEATHER WASTE USING BACILLUS SUBTILIS FOR THE PRODUCTION OF KERATINASE, ITS PURIFICATION AND IMMOBILIZATION WITH POLY (VINYL ALCOHOL)-ASSISTED SILVER NANO-PARTICLES. JMHSR [Internet]. 2025 Aug. 10 [cited 2026 Mar. 23];2(3). Available from: https://jmhsr.info/index.php/jmhsr/article/view/562