出典:Wikipedia
出典:『Wikipedia』 (2011/08/05 18:00 UTC 版)
Carbon fixation refers to any process through which gaseous carbon dioxide is converted into a solid compound. It refers mostly to the processes found in autotrophs (organisms that produce their own food), usually driven by photosynthesis, whereby carbon dioxide is changed into sugars. Carbon fixation can also be carried out by the process of calcification in marine calcifying organisms such as Emiliania huxleyi and also by heterotrophic organisms in some circumstances.