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2-Octyne, also known as methylpentylethyne and oct-2-yne, [1] is a type of alkyne with a triple bond at its second carbon (the '2-' indicates the location of the triple bond in the chain). Its formula is C 8 H 14. [2] Its density at 25 °C and otherwise stable conditions is 0.759 g/ml. [3] The boiling point is 137 °C. [3]
This plastoquinol is later oxidized back to PQ, releasing the 2e-to the cytochrome b 6 f complex and the two H + ions into the thylakoid lumen. The electrons then pass through Cyt b 6 and Cyt f to plastocyanin , using energy from photosystem I to pump hydrogen ions (H + ) into the thylakoid space.
5 cluster (including two chloride ions), one non heme Fe 2+ and two putative Ca 2+ ions per monomer. [4] There are several crystal structures of photosystem II. [5] The PDB accession codes for this protein are 3WU2, 3BZ1, 3BZ2 (3BZ1 and 3BZ2 are monomeric structures of the Photosystem II dimer), [4] 2AXT, 1S5L, 1W5C, 1ILX, 1FE1, 1IZL.
Photosystems are functional and structural units of protein complexes involved in photosynthesis. Together they carry out the primary photochemistry of photosynthesis: the absorption of light and the transfer of energy and electrons. Photosystems are found in the thylakoid membranes of plants, algae, and cyanobacteria.
Octynes are alkynes with one triple bond and the molecular formula C 8 H 14. ... 2-Octyne; 3-Octyne; 4-Octyne This page was last edited on 3 January 2022, at 15:02 ...
A proton gradient is created across the thylakoid membrane (6) as protons (3) are transported from the chloroplast stroma (4) to the thylakoid lumen (5). Through chemiosmosis, ATP (9) is produced where ATP synthase (1) binds an inorganic phosphate group (8) to an ADP molecule (7).
The thylakoid lumen is a continuous aqueous phase enclosed by the thylakoid membrane. It plays an important role for photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
In oxygenic photosynthesis, water (H 2 O) serves as a substrate for photolysis resulting in the generation of diatomic oxygen (O 2). This is the process which returns oxygen to Earth's atmosphere. Photolysis of water occurs in the thylakoids of cyanobacteria and the chloroplasts of green algae and plants. [3]