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Definition
 
enEnglish
Photosynthesis definition: The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide using energy obtained from light rather than from the oxidation of chemical compounds. Photosynthesis comprises two separate processes: the light reactions and the dark reactions. In higher plants; GREEN ALGAE; and CYANOBACTERIA; NADPH and ATP formed by the light reactions drive the dark reactions which result in the fixation of carbon dioxide. (from Oxford Dictionary of Biochemistry and Molecular Biology, 2001)
photosynthesis definition: energetic capture of visible light by certain plants and microorganisms, resulting in reduction of CO2 to carbohydrates and oxidation of water to O2; the biospheric reverse reaction of CELLULAR RESPIRATION.
photosynthesis definition: The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide (CO2) using energy obtained from light rather than from the oxidation of chemical compounds. [ISBN:0198547684]
Photosynthesis definition: The process through which light energy, water, and carbon dioxide are converted to carbohydrate and oxygen in the presence of chlorophyll. Occurs in plants, algae, cyanobacteria and lichens. (BioTech Life Science Dictionary)
electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity definition: Enables the directed movement of electrons within the cyclic electron transport pathway of photosynthesis. [GOC:ai, ISBN:0716731363]
electron transporter, transferring electrons within the noncyclic electron transport pathway of photosynthesis activity definition: Enables the directed movement of electrons within the noncyclic electron transport pathway of photosynthesis. [GOC:ai, ISBN:0716731363]
photosynthesis, dark reaction definition: A complex cycle of enzyme-mediated reactions which catalyzes the reduction of carbon dioxide to sugar. As well as carbon dioxide the cycle requires reducing power in the form of reduced nicotinamide adenine dinucleotide phosphate (NADP) and chemical energy in the form of adenosine triphosphate (ATP). The reduced NADP (NADPH) and ATP are produced by the 'light' reactions. [ISBN:0582015952]
C4 photosynthesis definition: The combination of atmospheric CO2 with a 3-carbon molecule phosphoenol pyruvate (PEP) in the mesophyll cells to make a 4-carbon acid which is immediately converted to malic acid. The malic acid is then passed across to the bundle sheath cells where it is broken down again to pyruvic acid and CO2. The acid is passed back to the mesophyll cells to be used again, while the CO2 is fed into the reductive pentose-phosphate cycle (Calvin cycle) and converted into sugar and starch. [ISBN:0816017360]
NAD-malic enzyme C4 photosynthesis definition: The process of C4 photosynthesis, as it occurs in plants in which the enzyme decarboxylating C4 acids in the bundle sheath is NAD-malic enzyme. [PMID:11788762]
NADP-malic enzyme C4 photosynthesis definition: The process of C4 photosynthesis, as it occurs in plants in which the enzyme decarboxylating C4 acids in the bundle sheath is NADP-malic enzyme. [PMID:11788762]
PEP carboxykinase C4 photosynthesis definition: The process of C4 photosynthesis, as it occurs in plants in which the enzyme decarboxylating C4 acids in the bundle sheath is phosphoenolpyruvate carboxykinase (PEPCK). [PMID:11788762]
CAM photosynthesis definition: The combination of atmospheric CO2 with a 3-carbon molecule phosphoenol pyruvate (PEP) to make malic acid. The malic acid is then passed into the vacuole where it is stored until daylight, when it is shuttled back out to be used as a substrate in the light reaction of photosynthesis. [ISBN:0582015952]
photosynthesis, light reaction definition: The light reactions of photosynthesis, which take place in photosystems II and I. Light energy is harvested and used to power the transfer of electrons among a series of electron donors and acceptors. The final electron acceptor is NADP+, which is reduced to NADPH. NADPH generated from light reactions is used in sugar synthesis in dark reactions. Light reactions also generate a proton motive force across the thylakoid membrane, and the proton gradient is used to synthesize ATP. There are two chemical reactions involved in the light reactions: water oxidation in photosystem II, and NADP reduction in photosystem I. [http://www.arabidopsis.org]
photosynthesis, light harvesting definition: Absorption and transfer of the energy absorbed from light photons between photosystem reaction centers. [GOC:sm]
photosynthesis, light harvesting in photosystem I definition: After a photon of light is absorbed by one of the many chlorophyll molecules, in one of the light-harvesting complexes of an antenna on photosystem I, some of the absorbed energy is transferred to the pair of chlorophyll molecules in the reaction center. [GOC:jic, ISBN:0716731363, ISBN:0816017360]
photosynthesis, light harvesting in photosystem II definition: After a photon of light is absorbed by one of the many chlorophyll molecules, in one of the light-harvesting complexes of an antenna on photosystem II, some of the absorbed energy is transferred to the pair of chlorophyll molecules in the reaction center. [GOC:jic, ISBN:0716731363, ISBN:0816017360]
regulation of photosynthesis, light reaction definition: Any process that modulates the frequency, rate or extent of the light-dependent reaction of photosynthesis. [GOC:jl]
regulation of photosynthesis, dark reaction definition: Any process that modulates the frequency, rate or extent of photosynthesis dark reaction. [GOC:sm]
regulation of photosynthesis definition: Any process that modulates the frequency, rate or extent of photosynthesis. [GOC:sm]
negative regulation of photosynthesis, light reaction definition: Any process that stops, prevents or reduces the frequency, rate or extent of the light-dependent reaction of photosynthesis. [GOC:jl]
 
 
deGerman
Fotosynthese definition: [1] Erzeugung organischer Stoffe aus anorganischen Stoffen in chlorophyllhaltigen Pflanzen unter Mitwirkung von Licht
 
frFrench
photosynthèse definition: Processus biochimique grâce auquel les plantes et de nombreux autres êtres vivants transforment l’énergie lumineuse en énergie chimique sous forme de sucres (molécules riches en énergie) et synthétisées à partir de gaz carbonique et d’oxygène.