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plas·to·quin·one (PQ),

2,3-Dimethyl-1,4-benzoquinone with a multiprenyl side chain; a trivial name sometimes used for plastoquinone-9.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Bakeeva et al., "Mitochondria-targeted plastoquinone derivatives as tools to interrupt execution of the aging program.
Chlororespiration and poising of cyclic electron transport: plastoquinone as electron transporter between thylakoid NADH dehydrogenase and peroxidase.
The higher [F.sub.0]/[F.sub.m] indicates that the initial rate of reduction of the plastoquinone (Qa) was higher than the rate of plastoquinone reoxidation by b (Qb) and the activity of photosystem I (PSI) when plants were exposed to higher concentrations of NaCl.
In oxygenic photosynthesis, the electron transport from water to [NADP.sup.+] is mediated by two photosystems, operating in series through a chain of redox transporters that comprises plastoquinone, the cytochrome [b.sub.6],f complex and plastocyanin.
It was found that the effect of [PGE.sub.2] and [PGF.sub.2[Alpha]] was to inhibit the successive PS-I reactions from plastoquinone through P700 to the methylviologen acceptance site in the electron transport chain.
SkQ1 is a novel, rechargeable plastoquinone derivative, which accumulates in the inner mitochondrial membrane due to its molecular charge and lipophilic properties [29, 30].
The ratio RC/CSm is the amount of RCs per excited cross section (CSm), which is the density of second plastoquinone acceptors (QA) reducing PSII RC per CSm.
It is comprised of naturally occurring antioxidant plastoquinone, conjugated with transport molecule triphenylphosphonium, which ensures the penetration of the drug into the cell and its accumulation in the mitochondria [23].
2) with salinity and Pb stress might have resulted from reduced synthesis of chlorophyll and plastoquinone, distorted chloroplast ultra-structure, blocked electron transport and CO2 deficiency due to stomatal closure, all were occurring simultaneously (Sharma and Dubey, 2005; Ashraf and Harris, 2013).
Mitochondria-targeted antioxidants are usually chimeric molecules of a cation triphenylphosphonium (TPP) conjugated with an antioxidant moiety such as coenzyme [Q.sub.10] or plastoquinone [53, 54].