The Pathway Ontology (PW), is currently being developed at the Rat Genome Database. For more information about this vocabulary, please see Petri et al. The rat genome database pathway portal. Database (Oxford). 2011 Apr 8;2011:bar010. Print 2011 or contact us (http://rgd.mcw.edu/contact/index.shtml).
A chemical combination caused by the action of light; specifically the formation of carbohydrates (with release of molecular oxygen) from carbon dioxide and water in the chlorophyll tissue of plants and blue-green algae under the influence of light. In bacteria, photosynthesis employs hydrogen sulfide, molecular hydrogen, and other reduced compounds in place of water, so that molecular oxygen is not released.