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In return, the zooxanthellae provide compounds that give energy to the coral through photosynthesis. [19] This relationship has allowed coral to survive for at least 210 million years in nutrient-poor environments. [19] Coral bleaching is caused by the breakdown of this relationship. [2] Coral bleaching in ecosystems is a complex dynamic.
The cyclic light-dependent reactions occur only when the sole photosystem being used is photosystem I. Photosystem I excites electrons which then cycle from the transport protein, ferredoxin (Fd), to the cytochrome complex, b 6 f, to another transport protein, plastocyanin (Pc), and back to photosystem I. A proton gradient is created across the ...
Pc(Cu +) + Fd[ox] + hν → Pc(Cu 2+) + Fd[red] The cooperation between Photosystems I and II creates an electron and proton flow from H 2 O to NADP + , producing NADPH needed for glucose synthesis. This pathway is called the ' Z-scheme ' because the redox diagram from H 2 O to NADP + via P680 and P700 resembles the letter Z. [ 11 ]
In this process, hydrogen chloride is oxidized by oxygen over a copper chloride catalyst, resulting in the production of chlorine. This was widely used in the paper and textile industries as a bleaching agent, and as a result sodium carbonate was no longer the primary product of these plants, and henceforth sold at a loss.
The principal example is tert-butyl hypochlorite, which is a useful chlorinating agent. [3] Most hypochlorite salts are handled as aqueous solutions. Their primary applications are as bleaching, disinfection, and water treatment agents. They are also used in chemistry for chlorination and oxidation reactions.
Calvin cycle step 1 (black circles represent carbon atoms) Calvin cycle steps 2 and 3 combined. The enzyme RuBisCO catalyses the carboxylation of ribulose-1,5-bisphosphate, RuBP, a 5-carbon compound, by carbon dioxide (a total of 6 carbons) in a two-step reaction. [6] The product of the first step is enediol-enzyme complex that can capture CO 2 ...
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NADPH is a universal agent used to reduce CO 2 into sugars as well as other biosynthetic reactions. Reaction center chlorophyll–protein complexes are capable of directly absorbing light and performing charge separation events without the assistance of other chlorophyll pigments, but the probability of that happening under a given light ...