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Summary
Simplified Model of a Primary Cell Wall
Description : Cellulose in higher plants is organized into microfibrils, each measuring about 3 to 6 nm in diameter and containing up to 36 glucan chains having thousands of glucose residues. Like steel girders stabilizing a skyscraper’s structure, the primary cell-wall’s mechanical strength is due mainly to the microfibril scaffold. A microfibril’s crystalline and paracrystalline (amorphous) cellulose core is surrounded by hemicellulose, a branched polymer composed of pentose (5-carbon) and hexose (6-carbon) sugars. In addition to cross-linking individual microfibrils, hemicellulose in secondary cell walls (not shown) forms covalent associations with lignin, a rigid aromatic polymer whose structure and organization within the cell wall are poorly understood. The crystallinity of cellulose and its association with hemicellulose and lignin are two key challenges preventing efficient cellulose breakdown into glucose molecules convertible to ethanol.
Copyright status
This image is public domain because it was first published by the U.S. Department of Energy
Source
http://genomics.energy.gov/gallery/biomass/detail.np/detail-04.html
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| Date/Time | Thumbnail | Dimensions | User | Comment |
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| current | 18:12, 16 July 2008 |  | 504 × 349 (210 KB) | Ashcraft | Simplified Model of a Primary Cell Wall Description : Cellulose in higher plants is organized into microfibrils, each measuring about 3 to 6 nm in diameter and containing up to 36 glucan chains having thousands of glucose residues. Like steel girders s |
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