Fig. 4From: Efficient isolation of keratin from protein-rich waste biomass: a practical approach to minimize environmental impact and valorize waste biomassMicrobial growth in the sample for microbial colonies isolated from soil a pure TMAOH (25% in water), b recycled TMAOH, and microbial colonies isolated from industrial sludge c pure TMAOH (25% in water), and d recovered TMAOHBack to article page