| | lignin on Encyclopedia.com (Site not responding. Last check: 2007-11-07) |
 | | The cellulose walls of the wood become impregnated with lignin, a process called lignification, which greatly increases the strength and hardness of the cell and gives the necessary rigidity to the tree. |
 | | Lignin Announces a Letter of Intent to Merge with Screen Giant Media Corp. |
 | | Biodegradation of spent pulping liquor lignins under mesophilic and thermophilic anaerobic conditions.(Environmental) |
| www.encyclopedia.com /html/l1/lignin.asp (349 words) |