Imperial College London

Emeritus ProfessorJimBarber

Faculty of Natural SciencesDepartment of Life Sciences

Senior Research Investigator
 
 
 
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Contact

 

+44 (0)20 8747 1165j.barber

 
 
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Location

 

711Sir Ernst Chain BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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614 results found

Allakhverdiev SI, Zharmukhamedov SK, Rodionova MV, Shuvalov VA, Dismukes C, Shen J-R, Barber J, Samuelsson G, Govindjeeet 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

JOURNAL ARTICLE

Antony RP, Zhang M, Zhou K, Loo SCJ, Barber J, Wong LHet 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

JOURNAL ARTICLE

Tay YF, Kaneko H, Chiam SY, Lie S, Zheng Q, Wu B, Hadke SS, Su Z, Bassi PS, Bishop D, Sum TC, Minegishi T, Barber J, Domen K, Wong LHet 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

JOURNAL ARTICLE

Barber J, 2017, A mechanism for water splitting and oxygen production in photosynthesis, NATURE PLANTS, Vol: 3, ISSN: 2055-026X

JOURNAL ARTICLE

Barber J, 2017, Photosynthetic Water Splitting Provides a Blueprint for Artificial Leaf Technology, JOULE, Vol: 1, Pages: 5-9, ISSN: 2542-4351

JOURNAL ARTICLE

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.

JOURNAL ARTICLE

Barber J, 2017, Bioenergetics, water splitting and artificial photosynthesis, Photosynthesis and Bioenergetics, Pages: 117-148, ISBN: 9789813230309

© 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 see

BOOK CHAPTER

Barber J, Ruban AV, 2017, Preface, ISBN: 9789813230309

© 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.

BOOK

Kaucikas M, Barber J, Renger T, Van Thor JJet al., 2017, Femtosecond infrared crystallography of photosystem II core complexes: Watching exciton dynamics and charge separation in real space and time, Photosynthesis and Bioenergetics, Pages: 81-116, ISBN: 9789813230309

© 2018 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. We have shown structurally sensitive femtosecond time resolved infrared crystallography of oriented orthorhombic single crystals of photosystem II core complexes of Synechococcus elongatus, which allows a real-space analysis of exciton dynamics and charge separation. Directional selection of both the visible excitation and the infrared probes prepares and measures populations selectively which are analysed on the basis of X-ray crystallographic coordinates. Excited state chlorophyll a infrared absorption allows a real space probe of exciton dynamics in the local, single pigment, basis. Two contrasting models, known as the trap-limited and as transfer-to-the-trap limited model are critically tested. The dichroic amplitudes that result from photoselection are maintained on the ~60 ps time-scale that corresponds to the dominant energy transfer process which directly supports the transfer-to-the-trap limitation of the overall light-harvesting process. A detailed comparison with structure-based theory of exciton dynamics in photosystem II extends existing theory to the crystallographic case. On nanosecond time-scale non-crystallographic symmetry is developed for a structural measurement of the P680+/Pheo-charge separated state that supports the mode assignments for Pheo/Pheo-and P680/P680+.

BOOK CHAPTER

MacGregor-Chatwin C, Sener M, Barnett SFH, Hitchcock A, Barnhart-Dailey MC, Maghlaoui K, Barber J, Timlin JA, Schulten K, Hunter CNet al., 2017, Lateral Segregation of Photosystem I in Cyanobacterial Thylakoids, PLANT CELL, Vol: 29, Pages: 1119-1136, ISSN: 1040-4651

JOURNAL ARTICLE

Wei C, Feng Z, Scherer GG, Barber J, Shao-Horn Y, Xu ZJet al., 2017, Cations in Octahedral Sites: A Descriptor for Oxygen Electrocatalysis on Transition-Metal Spinels, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648

JOURNAL ARTICLE

Zhao J, Sun L, Canepa S, Sun H, Yesibolati MN, Sherburne M, Xu R, Sritharan T, Loo JSC, Ager JW, Barber J, Molhave K, Xu ZJet 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

JOURNAL ARTICLE

Albanese P, Manfredi M, Meneghesso A, Marengo E, Saracco G, Barber J, Morosinotto T, Pagliano Cet 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

JOURNAL ARTICLE

Albanese P, Nield J, Tabares JAM, Chiodoni A, Manfredi M, Gosetti F, Marengo E, Saracco G, Barber J, Pagliano Cet 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

JOURNAL ARTICLE

Antony RP, Baikie T, Chiam SY, Ren Y, Prabhakar RR, Batabyal SK, Loo SCJ, Barber J, Wong LHet 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

JOURNAL ARTICLE

Antony RP, Bassi PS, Abdi FF, Chiam SY, Ren Y, Barber J, Loo JSC, Wong LHet 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

JOURNAL ARTICLE

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

JOURNAL ARTICLE

Barber J, 2016, Mn4Ca Cluster of Photosynthetic Oxygen-Evolving Center: Structure, Function and Evolution, BIOCHEMISTRY, Vol: 55, Pages: 5901-5906, ISSN: 0006-2960

JOURNAL ARTICLE

Bassi PS, Antony RP, Boix PP, Fang Y, Barber J, Wong LHet 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

JOURNAL ARTICLE

Bassi PS, Li X, Fang Y, Loo JSC, Barber J, Wong LHet 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

JOURNAL ARTICLE

Kaucikas M, Maghlaoui K, Barber J, Renger T, van Thor JJet al., 2016, Ultrafast infrared observation of exciton equilibration from oriented single crystals of photosystem II, NATURE COMMUNICATIONS, Vol: 7, ISSN: 2041-1723

JOURNAL ARTICLE

MacDonald JT, Kabasakal BV, Godding D, Kraatz S, Henderson L, Barber J, Freemont PS, Murray JWet 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: 0027-8424

JOURNAL ARTICLE

Tran PD, Tran TV, Orio M, Torelli S, Truong QD, Nayuki K, Sasaki Y, Chiam SY, Yi R, Honma I, Barber J, Artero Vet al., 2016, Coordination polymer structure and revisited hydrogen evolution catalytic mechanism for amorphous molybdenum sulfide, NATURE MATERIALS, Vol: 15, Pages: 640-+, ISSN: 1476-1122

JOURNAL ARTICLE

Chen Y, Tran PD, Boix P, Ren Y, Chiam SY, Li Z, Fu K, Wong LH, Barber Jet 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

JOURNAL ARTICLE

Flicek RC, Hills DA, Barber JR, Dini Det al., 2015, Determination of the shakedown limit for large, discrete frictional systems, EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, Vol: 49, Pages: 242-250, ISSN: 0997-7538

JOURNAL ARTICLE

Gurudayal, Chee PM, Boix PP, Ge H, Fang Y, Barber J, Wong LHet 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

JOURNAL ARTICLE

Gurudayal, Sabba D, Kumar MH, Wong LH, Barber J, Graetzel M, Mathews Net al., 2015, Perovskite-Hematite Tandem Cells for Efficient Overall Solar Driven Water Splitting, NANO LETTERS, Vol: 15, Pages: 3833-3839, ISSN: 1530-6984

JOURNAL ARTICLE

Hu P, Ngaw CK, Tay YY, Cao S, Barber J, Tan TTY, Loo SCJet 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

JOURNAL ARTICLE

Raine R, Bhaird CNA, Xanthopoulou P, Wallace I, Ardron D, Harris M, Barber J, Prentice A, Gibbs S, King M, Blazeby JM, Michie S, Lanceley A, Clarke A, Livingston Get 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

JOURNAL ARTICLE

Zhao J, Tran PD, Chen Y, Loo JSC, Barber J, Xu ZJet 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

JOURNAL ARTICLE

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