Photosynthetic Reaction-Center/Graphene Biohybrid for Optoelectronics

Photosynthetic reaction center proteins (RC) purified from purple bacterial strains were deposited on graphene layer prepared by liquid phase exfoliation and light-induced resistance change was measured. By measuring the temperature dependence of the resistance change of the bare and RC covered graphene and comparing with the one inactivated by protein unfolding, two effects were possible to separate. One of them is the resistance change due to temperature effect. The other one clearly indicates a possible electric/electronic interaction between the charge flow in the graphene and the light-induced charge pair within the protein, which is, essentially, different in the open (dark, PBPheo) and closed (light, P+BPheo−) states. These results provide useful information for designing hybrid bio-photonic devices which are able to absorb and convert light energy.

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The Singlet-Triplet Splitting of the Primary Radical Pair in the Bacterial Photosynthetic Reaction Center*

Zeitschrift für Physikalische Chemie ◽

10.1524/zpch.1992.1.part_1.193 ◽

1992 ◽

Vol 1 (Part_1) ◽

pp. 193-208

Author(s):

M. Bixon ◽

J. Jortner ◽

M. E. Michel-Beyerle

Keyword(s):

Reaction Center ◽

Radical Pair ◽

Photosynthetic Reaction Center ◽

Primary Radical ◽

Triplet Splitting ◽

Primary Radical Pair ◽

Bacterial Photosynthetic Reaction Center

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Computational Investigation of the Asymmetry in Photosynthetic Reaction Center Models from First Principles

10.26434/chemrxiv.11980119.v1 ◽

2020 ◽

Author(s):

Denis Artiukhin ◽

Patrick Eschenbach ◽

Johannes Neugebauer

Keyword(s):

Spin Density ◽

Reaction Center ◽

Density Functional ◽

Photosynthetic Reaction Center ◽

Chem Phys ◽

Molecular Structures ◽

Error Characteristic ◽

Molecular Systems ◽

Density Distributions ◽

The Asymmetry

We present a computational analysis of the asymmetry in reaction center models of photosystem I, photosystem II, and bacteria from Synechococcus elongatus, Thermococcus vulcanus, and Rhodobacter sphaeroides, respectively. The recently developed FDE-diab methodology [J. Chem. Phys., 148 (2018), 214104] allowed us to effectively avoid the spin-density overdelocalization error characteristic for standard Kohn–Sham Density Functional Theory and to reliably calculate spin-density distributions and electronic couplings for a number of molecular systems ranging from dimeric models in vacuum to large protein including up to about 2000 atoms. The calculated spin densities showed a good agreement with available experimental results and were used to validate reaction center models reported in the literature. We demonstrated that the applied theoretical approach is very sensitive to changes in molecular structures and relative orientation of molecules. This makes FDE-diab a valuable tool for electronic structure calculations of large photosynthetic models effectively complementing the existing experimental techniques.

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Faculty Opinions recommendation of Light-induced structural changes in a photosynthetic reaction center caught by Laue diffraction.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.3248957.2952057 ◽

2010 ◽

Author(s):

Nathan Nelson ◽

Alexey Amunts

Keyword(s):

Reaction Center ◽

Structural Changes ◽

Photosynthetic Reaction Center ◽

Laue Diffraction

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Type II Photosynthetic Reaction Center Genes of Avocado (Persea americana Mill.) Bark Microbial Communities are Dominated by Aerobic Anoxygenic Alphaproteobacteria

Current Microbiology ◽

10.1007/s00284-021-02525-6 ◽

2021 ◽

Author(s):

Eneas Aguirre-von-Wobeser

Keyword(s):

Microbial Communities ◽

Reaction Center ◽

Photosynthetic Reaction Center ◽

Persea Americana ◽

Type Ii

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A New Supported Manganese-Based Coordination Complex as a Nano-Catalyst for the Synthesis of Indazolophthalazinetriones and Investigation of Its Antibacterial Activity

Chemistry ◽

10.3390/chemistry3030056 ◽

2021 ◽

Vol 3 (3) ◽

pp. 783-799

Author(s):

Maryam Ariannezhad ◽

Davood Habibi ◽

Somayyeh Heydari ◽

Vahideh Khorramabadi

Keyword(s):

Antibacterial Activity ◽

Simple Procedure ◽

Condensation Reaction ◽

Antibacterial Properties ◽

Coordination Complex ◽

Bacterial Strains ◽

One Pot ◽

Nano Catalyst ◽

Ft Ir ◽

The One

A new magnetic supported manganese-based coordination complex (Fe3O4@SiO2@CPTMS@MBOL@ Mn) was prepared in consecutive stages and characterized via various techniques (VSM, SEM, TEM, XRD, FT-IR, EDX, TG-DTA, and ICP). To evaluate its application, it was used for synthesis of divers Indazolophthalazinetriones in a simple procedure via the one-pot three-component condensation reaction of aldehydes, dimedone, and phthalhydrazide in ethanol under reflux conditions. The Mn catalyst can be recycled without any noticeable loss in catalytic activity. Additionally, the antibacterial properties of the nano-catalyst were studied against some bacterial strains.

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