Noun
English Wikipedia has an article on:photosystemWikipedia
photosystem (plural photosystems)
(biochemistry) Either of two biochemical systems, active in chloroplasts, that are part of photosynthesis
However, since photosystem II is the first step of the Z-scheme, an external source of electrons is required to reduce its oxidized chlorophyll a molecules. Source: Internet
Its production leaves chlorophyll in photosystem I with a deficit of electrons (chlorophyll has been oxidized), which must be balanced by some other reducing agent that will supply the missing electron. Source: Internet
In contrast, photosystem I and ATP synthase are large protein complexes which jut out into the stroma. Source: Internet
Photosystem II and photosystem I contain light-harvesting complexes with chlorophyll and carotenoids that absorb light energy and use it to energize electrons. Source: Internet
In the non-cyclic reaction, the photons are captured in the light-harvesting antenna complexes of photosystem II by chlorophyll and other accessory pigments (see diagram at right). Source: Internet
The antenna system is at the core of the chlorophyll molecule of the photosystem II reaction center. Source: Internet