The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Jack J. S. Van Rensen - One of the best experts on this subject based on the ideXlab platform.
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Influence of photoinhibition on electron transport and Photophosphorylation of isolated chloroplasts
Physiologia Plantarum, 1993Co-Authors: V.b. Curwiel, Jack J. S. Van RensenAbstract:The effects of a photoinhibition treatment (PIT) on electron transport and Photophosphorylation reactions were measured in chloroplasts isolated from triazine-resistant and susceptible Chenopodium album plants grown under high and low irradiance. Electron transport dependent on photosystem I (PSI) alone was much less affected by PIT than that dependent on both photosystem II (PSII) and PSI. There was a smaller difference in susceptibility to PIT between the Photophosphorylation activitity dependent on PSI alone and that dependent on both PSII and PSI. Because in all cases Photophosphorylation activity decreased faster upon PIT than the rate of electron transport, we conclude that photoinhibition causes a gradual uncoupling of electron transport with phosphorylation. Since the extent of the light-induced proton gradient across the thylakoid membrane decreased upon PIT, it is suggested that photoinhibiton causes a proton leakiness of the membrane. We have found no significant differences to PIT of the various reactions measured in chloroplasts isolated from triazine-resistant and susceptible plants. We have also not observed any significant differences to PIT of the Photophosphorylation reactions in chloroplasts of plants grown under low irradiance, compared with those grown under high irradiance. However, the electron transport reactions in chloroplasts from plants grown under low irradiance appeared to be somewhat less sensitive to PIT than those grown under high irradiance.
V.b. Curwiel - One of the best experts on this subject based on the ideXlab platform.
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Influence of photoinhibition on electron transport and Photophosphorylation of isolated chloroplasts
Physiologia Plantarum, 1993Co-Authors: V.b. Curwiel, Jack J. S. Van RensenAbstract:The effects of a photoinhibition treatment (PIT) on electron transport and Photophosphorylation reactions were measured in chloroplasts isolated from triazine-resistant and susceptible Chenopodium album plants grown under high and low irradiance. Electron transport dependent on photosystem I (PSI) alone was much less affected by PIT than that dependent on both photosystem II (PSII) and PSI. There was a smaller difference in susceptibility to PIT between the Photophosphorylation activitity dependent on PSI alone and that dependent on both PSII and PSI. Because in all cases Photophosphorylation activity decreased faster upon PIT than the rate of electron transport, we conclude that photoinhibition causes a gradual uncoupling of electron transport with phosphorylation. Since the extent of the light-induced proton gradient across the thylakoid membrane decreased upon PIT, it is suggested that photoinhibiton causes a proton leakiness of the membrane. We have found no significant differences to PIT of the various reactions measured in chloroplasts isolated from triazine-resistant and susceptible plants. We have also not observed any significant differences to PIT of the Photophosphorylation reactions in chloroplasts of plants grown under low irradiance, compared with those grown under high irradiance. However, the electron transport reactions in chloroplasts from plants grown under low irradiance appeared to be somewhat less sensitive to PIT than those grown under high irradiance.
Kuniaki Hosono - One of the best experts on this subject based on the ideXlab platform.
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ATP regeneration by cyclic Photophosphorylation using spinach thylakoid
Biotechnology Letters, 1991Co-Authors: Kuniaki HosonoAbstract:ATP Photophosphorylation by spinach thylakoid was examined to evaluate its use as an ATP regeneration reaction in biosynthetic reactors that consume ATP. Initial rate of cyclic Photophosphorylation mediated by phenazine methosulfate was found to be 218 μmole ATP/h.mg Chlorophyll. This activity was stable for over 3 months at −85°C. When phosphoryl transfer reactions were coupled to cyclic Photophosphorylation, ATP was continuously regenerated by thylakoid between 14–24 times in batch reactors.
Jinbo Fei - One of the best experts on this subject based on the ideXlab platform.
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Proton-consumed nanoarchitectures toward sustainable and efficient Photophosphorylation.
Journal of colloid and interface science, 2018Co-Authors: Jinbo Fei, Jong-dal HongAbstract:At present, Photophosphorylation in natural or artificial systems is accomplished by the production of protons or their pumping across the biomembranes. Herein, different from this strategy above, we demonstrate a designed system which can effectively enhance Photophosphorylation by photo-induced proton-scavenging through molecular assembly. Upon the introduction of photobase generators, a (photo-) chemical reaction occurs to produce hydroxyl ions. Accompanying the further extramembranous acid-base neutralization reaction, an outbound flow of protons is generated to drive the reconstituted adenosine triphosphate (ATP) synthase to produce ATP. That is, contrary to biochemistry, the proton gradient to drive Photophosphorylation derives from the scavenging of protons present in the external medium by hydroxyl ions, produced by the partially photo-induced splitting of photobase generator. Such assembled system holds great potential in ATP-consuming bioapplications.
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optically matched semiconductor quantum dots improve Photophosphorylation performed by chloroplasts
Angewandte Chemie, 2018Co-Authors: Jinbo Fei, Tingting Yuan, Chenlei WangAbstract:A natural-artificial hybrid system was constructed to enhance Photophosphorylation. The system comprises chloroplasts modified with optically matched quantum dots (chloroplast-QD) with a large Stokes shift. The QDs possess a unique optical property and transform ultraviolet light into available and highly effective red light for use by chloroplasts. This favorable feature enables photosystem II contained within the hybrid system to split more water and produce more protons than chloroplasts would otherwise do on their own. Consequently, a larger proton gradient is generated and Photophosphorylation is improved. At optimal efficiency activity increased by up to 2.3 times compared to pristine chloroplasts. Importantly, the degree of overlap between emission of the QDs and absorption of chloroplasts exerts a strong influence on the Photophosphorylation efficiency. The chloroplast-QD hybrid presents an efficient solar energy conversion route, which involves a rational combination of a natural system and an artificial light-harvesting nanomaterial.
Jong-dal Hong - One of the best experts on this subject based on the ideXlab platform.
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Proton-consumed nanoarchitectures toward sustainable and efficient Photophosphorylation.
Journal of colloid and interface science, 2018Co-Authors: Jinbo Fei, Jong-dal HongAbstract:At present, Photophosphorylation in natural or artificial systems is accomplished by the production of protons or their pumping across the biomembranes. Herein, different from this strategy above, we demonstrate a designed system which can effectively enhance Photophosphorylation by photo-induced proton-scavenging through molecular assembly. Upon the introduction of photobase generators, a (photo-) chemical reaction occurs to produce hydroxyl ions. Accompanying the further extramembranous acid-base neutralization reaction, an outbound flow of protons is generated to drive the reconstituted adenosine triphosphate (ATP) synthase to produce ATP. That is, contrary to biochemistry, the proton gradient to drive Photophosphorylation derives from the scavenging of protons present in the external medium by hydroxyl ions, produced by the partially photo-induced splitting of photobase generator. Such assembled system holds great potential in ATP-consuming bioapplications.