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Most microorganisms capable of degrading cellulose and xylan  synthesize a  range  of  isoenzymes  with  very  similar  substrate specificities (1). However, xylan present in cell wall and also in the middle of lamella of plant cells is heterogeneous in structure  and  not  degradable  by  a  single  enzyme  but  by  a  xylanolytic  enzyme complex (4). Among these enzymes, endo-1,4-¦Â-xylanase and ¦Â-D-xylosidase have been extensively studied. Others such as  those  containing  acetylxylan  esterase,  arabinase,  R-glucuroni-discovered during recent years (5). Since xylan hydrolysates such as xylose and xylo-oligosaccharides can be good for animal feeds and  pharmaceutical,  chemical,  and  health  food  industries  (5),  many scientists are attracted to investigate xylanases (6).

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xiaoqihu

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godjoy(½ð±Ò+1): 2010-03-05 21:46
godjoy(½ð±Ò+1): 2010-03-05 21:47
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