Cellulose

Cellulose is B,1-4 glycosidic linked glucoses most notably produced by plants as a structural material. Cellulose is useful to humans as a digestive and material fiber. Additionally cellulose can be extracted and polymerized with different functional groups as a bioplastic. Cellulose beta linkages are very stable and formed by plants to be very difficult to break, but the glucose monomers yield large amounts of energy once released. Waste biomass is largely cellulose and its companion polymers lignin and hemicellulose.

Bacterial Cellulose, as the name suggests is cellulose produced/grown by bacteria from a growing medium. It can be a useful material, and its derivation directly from bacteria cuts out the need to extract cellulose from other sources in what are fairly complicated processes (such as from wood or other plant matter).