615 results found
Allakhverdiev SI, Zharmukhamedov SK, Rodionova MV, et al., 2018, Vyacheslav (Slava) Klimov (1945-2017): A scientist par excellence, a great human being, a friend, and a Renaissance man, PHOTOSYNTHESIS RESEARCH, Vol: 136, Pages: 1-16, ISSN: 0166-8595
Tay YF, Kaneko H, Chiam SY, et al., 2018, Solution-Processed Cd-Substituted CZTS Photocathode for Efficient Solar Hydrogen Evolution from Neutral Water, JOULE, Vol: 2, Pages: 537-548, ISSN: 2542-4351
Antony RP, Zhang M, Zhou K, et al., 2018, Synergistic Effect of Porosity and Gradient Doping in Efficient Solar Water Oxidation of Catalyst-Free Gradient Mo:BiVO4, ACS OMEGA, Vol: 3, Pages: 2724-2734, ISSN: 2470-1343
Kacikas M, Renger T, van Thor J, 2017, Femtosecond Infrared Crystallography of Photosystem II core complexes: Watching exciton dynamics and charge separation in real space and time, Photosynthesis and Bioenergetics, Editors: Barber, Ruban, ISBN: 978-981-3230-29-3
Barber J, 2017, Photosynthetic Water Splitting Provides a Blueprint for Artificial Leaf Technology, JOULE, Vol: 1, Pages: 5-9, ISSN: 2542-4351
Zhao J, Sun L, Canepa S, et al., 2017, Phosphate tuned copper electrodeposition and promoted formic acid selectivity for carbon dioxide reduction, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 5, Pages: 11905-11916, ISSN: 2050-7488
Wei C, Feng Z, Scherer GG, et al., 2017, Cations in Octahedral Sites: A Descriptor for Oxygen Electrocatalysis on Transition-Metal Spinels, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648
MacGregor-Chatwin C, Sener M, Barnett SFH, et al., 2017, Lateral Segregation of Photosystem I in Cyanobacterial Thylakoids, PLANT CELL, Vol: 29, Pages: 1119-1136, ISSN: 1040-4651
Barber J, 2017, A mechanism for water splitting and oxygen production in photosynthesis, NATURE PLANTS, Vol: 3, ISSN: 2055-026X
Barber J, Ruban AV, 2017, Preface, ISBN: 9789813230293
© 2018 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. This book is a tribute to three outstanding scientists, Professors Jan Anderson FRS, Leslie Dutton FRS and John Walker FRS, Nobel Laureate. Covering some of the most recent advances in the fields of Bioenergetics and Photosynthesis, this book is a compilation of contributions from leading scientists actively involved in understanding the natural biological processes associated with the flow of energy in biological cells. The lectures found in this significant volume were presented at a meeting in March 2016 in Singapore to commemorate the outstanding research in this area. The contents begin with the ideas, specially the contribution from Nobel Laureate Rudolph Marcus, who is well-known for creating the theory of electron transport reactions. This is followed by contributions of many others on various aspects of respiratory and photosynthetic transport chains as well as the dynamic regulation of light harvesting and electron transport events in oxygenic photosynthesis. The book is highly recommended to postgraduate students and researchers who are interested in various aspects of bioenergetic cycles.
Barber J, 2017, Bioenergetics, water splitting and artificial photosynthesis, Photosynthesis and Bioenergetics, Pages: 117-148, ISBN: 9789813230293
© 2018 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. About three billion years ago an enzyme emerged which would dramatically change the chemical composition of our planet and set in motion an unprecedented explosion in biological activity. This enzyme used solar energy to power the thermodynamically and chemically demanding reaction of water splitting. In so doing, it provided biology with an unlimited supply of reducing equivalents needed to convert carbon dioxide into the organic molecules of life while at the same time produced oxygen to transform our planetary atmosphere from an anaerobic to an aerobic state. The enzyme that facilitates this reaction and therefore underpins virtually all life on our planet, is known as photosystem II (PSII). It is a pigment-binding, multisubunit protein complex embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria. Today we have a detailed understanding of the structure and functioning of this key and unique enzyme. The journey to this level of knowledge can be traced back to the discovery of oxygen itself in the 18th century. Since then there has been a sequence of mile stone discoveries, which makes a fascinating story, stretching over 200 years. However, it is the last few years that have provided the level of detail necessary to reveal the chemistry of water oxidation and O-O bond formation. In particular, the crystal structure of the isolated PSII enzyme has been reported with ever-increasing improvement in resolution. Thus the organisational and structural details of the water splitting site were revealed as a cluster of four Mn ions and a Ca ion surrounded by amino acid side chains, of which seven provide direct ligands to the metals. The metal cluster is organised as a cubane structure composed of three Mn ions (Mn1, Mn2 and Mn3) and a Ca2+ linked by oxo-bonds with the fourth Mn ion (Mn4) connected to the cubane by two oxos (O4 and O5). This structure se
Barber J, 2017, Photosynthetic water splitting by the Mn4Ca2+OX catalyst of photosystem II: its structure, robustness and mechanism., Q Rev Biophys, Vol: 50
The biological energy cycle of our planet is driven by photosynthesis whereby sunlight is absorbed by chlorophyll and other accessory pigments. The excitation energy is then efficiently transferred to a reaction centre where charge separation occurs in a few picoseconds. In the case of photosystem II (PSII), the energy of the charge transfer state is used to split water into oxygen and reducing equivalents. This is accomplished by the relatively low energy content of four photons of visible light. PSII is a large multi-subunit membrane protein complex embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria. Four high energy electrons, together with four protons (4H+), are used to reduce plastoquinone (PQ), the terminal electron acceptor of PSII, to plastoquinol (PQH2). PQH2 passes its reducing equivalents to an electron transfer chain which feeds into photosystem I (PSI) where they gain additional reducing potential from a second light reaction which is necessary to drive CO2 reduction. The catalytic centre of PSII consists of a cluster of four Mn ions and a Ca2+ linked by oxo bonds. In addition, there are seven amino acid ligands. In this Article, I discuss the structure of this metal cluster, its stability and the probability that an acid-base (nucleophilic-electrophilic) mechanism catalyses the water splitting reaction on the surface of the metal-cluster. Evidence for this mechanism is presented from studies on water splitting catalysts consisting of organo-complexes of ruthenium and manganese and also by comparison with the enzymology of carbon monoxide dehydrogenase (CODH). Finally the relevance of our understanding of PSII is discussed in terms of artificial photosynthesis with emphasis on inorganic water splitting catalysts as oxygen generating photoelectrodes.
Kaucikas M, Maghlaoui K, barber J, et al., 2016, Ultrafast infrared observation of exciton equilibration from oriented single crystals of photosystem II, Nature Communications, Vol: 7, ISSN: 2041-1723
In oxygenic photosynthesis two photosystems work in series. Each of them contains a reaction center that is surrounded by light-harvesting antennae which absorb the light and transfer the excitation energy to the reaction center where electron transfer reactions are driven. Here, we report a critical test for two contrasting models of light harvesting by photosystem II cores, known as the trap-limited and the transfer-to-the trap limited model. Oriented single crystals of photosystem II core complexes of Synechococcus elongatus are excited by polarized visible light and the transient absorption is probed with polarized light in the infrared. The dichroic amplitudes resulting from photoselection are maintained on the 60 ps time scale that corresponds to the dominant energy transfer process providing compelling evidence for the transfer-to the–trap limitation of the overall light-harvesting process. This finding has functional implications for the quenching of excited states allowing plants to survive under high light intensities.
Albanese P, Nield J, Tabares JAM, et al., 2016, Isolation of novel PSII-LHCII megacomplexes from pea plants characterized by a combination of proteomics and electron microscopy, PHOTOSYNTHESIS RESEARCH, Vol: 130, Pages: 19-31, ISSN: 0166-8595
Bassi PS, Li X, Fang Y, et al., 2016, Understanding charge transport in non-doped pristine and surface passivated hematite (Fe2O3) nanorods under front and backside illumination in the context of light induced water splitting, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 18, Pages: 30370-30378, ISSN: 1463-9076
Barber J, 2016, Mn4Ca Cluster of Photosynthetic Oxygen-Evolving Center: Structure, Function and Evolution, BIOCHEMISTRY, Vol: 55, Pages: 5901-5906, ISSN: 0006-2960
Albanese P, Manfredi M, Meneghesso A, et al., 2016, Dynamic reorganization of photosystem II supercomplexes in response to variations in light intensities, BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS, Vol: 1857, Pages: 1651-1660, ISSN: 0005-2728
Antony RP, Baikie T, Chiam SY, et al., 2016, Catalytic effect of Bi5+ in enhanced solar water splitting of tetragonal BiV0.8Mo0.2O4, APPLIED CATALYSIS A-GENERAL, Vol: 526, Pages: 21-27, ISSN: 0926-860X
Antony RP, Bassi PS, Abdi FF, et al., 2016, Electrospun Mo-BiVO4 for Efficient Photoelectrochemical Water Oxidation: Direct Evidence of Improved Hole Diffusion Length and Charge separation, ELECTROCHIMICA ACTA, Vol: 211, Pages: 173-182, ISSN: 0013-4686
MacDonald JT, Kabasakal BV, Godding D, et al., 2016, Synthetic beta-solenoid proteins with the fragment-free computational design of a beta-hairpin extension, Proceedings of the National Academy of Sciences of the United States of America, Vol: 113, Pages: 10346-10351, ISSN: 1091-6490
The ability to design and construct structures with atomic level precisionis one of the key goals of nanotechnology. Proteins offer anattractive target for atomic design, as they can be synthesized chemicallyor biologically, and can self-assemble. However the generalizedprotein folding and design problem is unsolved. One approach tosimplifying the problem is to use a repetitive protein as a scaffold.Repeat proteins are intrinsically modular, and their folding and structuresare better understood than large globular domains. Here, wehave developed a new class of synthetic repeat protein, based onthe pentapeptide repeat family of beta-solenoid proteins. We haveconstructed length variants of the basic scaffold, and computationallydesigned de novo loops projecting from the scaffold core. Theexperimentally solved 3.56 ˚A resolution crystal structure of one designedloop matches closely the designed hairpin structure, showingthe computational design of a backbone extension onto a syntheticprotein core without the use of backbone fragments from knownstructures. Two other loop designs were not clearly resolved in thecrystal structures and one loop appeared to be in an incorrect conformation.We have also shown that the repeat unit can accommodatewhole domain insertions by inserting a domain into one of the designedloops.
Barber J, 2016, 'Photosystem II: the water splitting enzyme of photosynthesis and the origin of oxygen in our atmosphere', QUARTERLY REVIEWS OF BIOPHYSICS, Vol: 49, ISSN: 0033-5835
Tran PD, Tran TV, Orio M, et al., 2016, Coordination polymer structure and revisited hydrogen evolution catalytic mechanism for amorphous molybdenum sulfide, NATURE MATERIALS, Vol: 15, Pages: 640-+, ISSN: 1476-1122
Bassi PS, Antony RP, Boix PP, et al., 2016, Crystalline Fe2O3/Fe2TiO5 heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation, NANO ENERGY, Vol: 22, Pages: 310-318, ISSN: 2211-2855
Raine R, Bhaird CNA, Xanthopoulou P, et al., 2015, Use of a formal consensus development technique to produce recommendations for improving the effectiveness of adult mental health multidisciplinary team meetings, BMC Psychiatry, Vol: 15, ISSN: 1471-244X
Zhao J, Tran PD, Chen Y, et al., 2015, Achieving High Electrocatalytic Efficiency on Copper: A Low-Cost Alternative to Platinum for Hydrogen Generation in Water, ACS CATALYSIS, Vol: 5, Pages: 4115-4120, ISSN: 2155-5435
Gurudayal, Sabba D, Kumar MH, et al., 2015, Perovskite-Hematite Tandem Cells for Efficient Overall Solar Driven Water Splitting, NANO LETTERS, Vol: 15, Pages: 3833-3839, ISSN: 1530-6984
Chen Y, Tran PD, Boix P, et al., 2015, Silicon Decorated with Amorphous Cobalt Molybdenum Sulfide Catalyst as an Efficient Photocathode for Solar Hydrogen Generation, ACS NANO, Vol: 9, Pages: 3829-3836, ISSN: 1936-0851
Gurudayal, Chee PM, Boix PP, et al., 2015, Core-Shell Hematite Nanorods: A Simple Method To Improve the Charge Transfer in the Photoanode for Photoelectrochemical Water Splitting, ACS APPLIED MATERIALS & INTERFACES, Vol: 7, Pages: 6852-6859, ISSN: 1944-8244
van Oort B, Kargul J, Maghlaoui K, et al., 2015, Fluorescence kinetics of PSII crystals containing Ca2+ or Sr2+ in the oxygen evolving complex (vol 1837, pg 264, 2014), BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS, Vol: 1847, Pages: 377-377, ISSN: 0005-2728
Hu P, Ngaw CK, Tay YY, et al., 2015, A "uniform'' heterogeneous photocatalyst: integrated p-n type CuInS2/NaInS2 nanosheets by partial ion exchange reaction for efficient H-2 evolution, CHEMICAL COMMUNICATIONS, Vol: 51, Pages: 9381-9384, ISSN: 1359-7345
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.