Anammox is anoxic ammonia oxidation

Anoxygenic photosynthesis is photosynthesis in which O₂ is not produced

Antenna pigments are light-harvesting chlorophylls or bacteriochlorophylls in photocomplexes that funnel energy to the reaction center

Bacteriochlorophyll is the chlorophyll pigment of anoxygenic phototrophs

Carotenoid is a hydrophobic accessory pigment present along with chlorophyll in photosynthetic membranes

Hydrogenase is an enzyme, widely distributed in anaerobic microorganisms, capable of taking up or evolving H₂

The hydroxypropinate pathway is an autotrophic pathway found in Chloroflexus and a few archaea

Nitrogenase is an enzyme capable of reducing N₂ to NH₃ by nitrogenase

Photophosphorylation is the production of ATP in photosynthesis

Phycobiliprotein is the accessory pigment complex in cyanobacteria that contains phycocyanin and allophycocyanin or phycoerythrin coupled to proteins

A reaction center is a photosynthetic complex containing chlorophyll or bacteriochlorophyll and several other components within which occurs the initial electron transfer reactions of photosynthetic electron flow

The reverse citric acid cycle is a mechanism for autotrophy in green sulfur bacteria and a few other phototrophs

Reverse electron transport is the energy-dependent movement of electrons against the thermodynamic gradient to form a strong reductant from a weaker electron donor

RubisCO is the acronym for ribulose bisphosphate carboxylase, a key enzyme of the Calvin cycle

Thylakoids are membrane stacks in cyanobacteria or in the chloroplast of eukaryotic phototrophs