Word Count : 418

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Hemicellulose and lignin are two major components of plant cell walls, and their biodegradation is critical for nutrient cycling and biomass utilization in environmental biotechnology. Hemicellulose is a heterogeneous polysaccharide consisting of pentoses, hexoses, and sugar acids. Its structure is amorphous and branched, which makes it more accessible to enzymatic attack than cellulose. Microorganisms capable of degrading hemicellulose include bacteria such as *Bacillus*, *Clostridium*, *Paenibacillus*, and fungi like *Aspergillus*, *Trichoderma*, and *Penicillium*. These organisms secrete hemicellulases, a group of enzymes including xylanases, mannanases, arabinofuranosidases, and acetylesterases, which synergistically break down the hemicellulosic polymers into monomeric sugars that can be further metabolized. The degradation of ______ _________ _____ _________ ______ _____ _____.
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