دانلود رایگان مقاله لاتین جریان نوری فتوسیستم از سایت الزویر
عنوان فارسی مقاله:
جریان های نوری فتوسیستم 2 در سیستم ترکیبی اکسید فلز: مسیر انتقال الکترون
عنوان انگلیسی مقاله:
Photocurrents from photosystem II in a metal oxide hybrid system: Electron transfer pathways
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The conversion of solar energy into chemical energy through oxygenic photosynthesis is one of the most important biological processes. The key reaction is the light-driven oxidation of water, which occurs in Photosystem II (PSII) [1–4]. PSII is a large, multi-subunit transmembrane protein complex, which contains pigments and cofactors and is found in the photosynthetic membranes of cyanobacteria and photosynthetic eukaryotes [1–6]. Photoexcitation of chlorophylls in PSII initially generates a distribution of radical pairs. Rapid electron transfer reactions produce a secondary radical pair that consists of the cation radical localized on the chlorophyll known as PD1 and the anion radical localized mainly on the pheophytin, PhD1 (Fig. 1) [1–3]. Electron transfer from the pheophytin anion radical, PhD1−•, reduces a bound plastoquinone, QA, forming the semiquinone anion radical, QA −•. The electron on QA −• is transferred to a second quinone, QB, which is exchangeable when oxidized or fully reduced and is tightly bound only when in the QB −• state. When a second light-induced charge separation takes place, QB −• becomes protonated forming the quinol QBH2, which then exchanges for another quinone in the membrane pool. The electron hole at PD1+• is able to oxidize a tyrosine residue, TyrZ. The neutral tyrosyl radical, TyrZ• oxidizes a heteronuclear Mn4CaO5 cluster located on the luminal side of the enzyme. When four successive charge equivalents are accumulated on the cluster (each state known as an S-state), the metal cluster oxidizes two molecules of water with the release of O2 and four protons [1,2,4]. Knowledge of PSII has inspired the field of artificial photosynthesis, in which robust and cheap catalysts are being developed for the photochemical and electrochemical generation of fuels using solar energy [7–13]. The enzyme itself is often considered to have applications in a range of photoelectrochemical devices [14–18]. However, the use of isolated PSII in energy generation appears unrealistic, not only because of the energy, time and effort required for isolating it from the living cell, but also because PSII undergoes photodamage. Indeed the D1 protein,
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کلمات کلیدی:
Generation of Photocurrents by Bis-aniline-Cross-Linked Pt ... pubs.acs.org/doi/abs/10.1021/jp100454u by O Yehezkeli - 2010 - Cited by 55 - Related articles Apr 22, 2010 - Pt nanocrystals are implanted into photosystem I (PSI) by a ... to effective charge separation and to generation of a photocurrent, ϕ (λ = 420 nm) ... Unidirectional Photocurrent of Photosystem I on π ... - ACS Publications pubs.acs.org/doi/pdf/10.1021/acs.langmuir.5b01625 by SC Feifel - 2015 - Cited by 6 - Related articles Sep 8, 2015 - Unidirectional Photocurrent of Photosystem I on π‑System-Modified. Graphene Electrodes: Nanobionic Approaches for the Construction. Enhanced Photocurrents of Photosystem I Films on p-Doped Silicon ... onlinelibrary.wiley.com/doi/10.1002/adma.201202794/abstract by G LeBlanc - 2012 - Cited by 60 - Related articles Sep 4, 2012 - Enhanced Photocurrents of Photosystem I Films on p-Doped Silicon ... silicon results in the highest reported photocurrent enhancement for a ... Photosystem I (PSI)/Photosystem II (PSII)-Based Photo ... onlinelibrary.wiley.com/doi/10.1002/smll.201300051/abstract by O Yehezkeli - 2013 - Cited by 36 - Related articles Apr 18, 2013 - Photosystem I (PSI)/Photosystem II (PSII)-Based Photo-Bioelectrochemical Cells Revealing Directional Generation of Photocurrents ... Enhanced Photocurrents of Photosystem I Films on pDoped Silicon onlinelibrary.wiley.com/doi/10.1002/adma.201202794/pdf by G LeBlanc - 2012 - Cited by 61 - Related articles Sep 4, 2012 - Gabriel LeBlanc , Gongping Chen , Evan A. Gizzie , G. Kane Jennings , and David E. Cliffel *. Enhanced Photocurrents of Photosystem I Films ... Enhanced photocurrent from Photosystem I upon in vitro truncation of ... link.springer.com/article/10.1007/s11120-015-0162-5 by JR Carter - 2016 - Related articles Jun 2, 2015 - Enhanced photocurrent from Photosystem I upon in vitro truncation of the antennae chlorophyll. Authors; Authors and affiliations. J. Ridge ... [PDF]Organic Monolayers on p-Doped Silicon Affect Photocurrents of ... https://www.vanderbilt.edu/vinse/docs/Helena-Keller-REU-Poster.pdf Organic Monolayers on p-Doped Silicon Affect Photocurrents of Photosystem I Films. Helena Kellera, Siyuan Yangb, Gabriel LeBlancc, David E. Cliffelc and G.
