A5066078516- Photosynthetic Processes and Mechanisms
- Metal-Catalyzed Oxygenation Mechanisms
- Metalloenzymes and iron-sulfur proteins
- Electrocatalysts for Energy Conversion
- Algal biology and biofuel production
- Porphyrin and Phthalocyanine Chemistry
- Photoreceptor and optogenetics research
- Metal complexes synthesis and properties
- Magnetism in coordination complexes
- Advanced battery technologies research
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Microbial Community Ecology and Physiology
- Crystallization and Solubility Studies
- Mitochondrial Function and Pathology
- Electrochemical Analysis and Applications
- Catalysis for Biomass Conversion
- Machine Learning in Materials Science
- Biocrusts and Microbial Ecology
- Light effects on plants
- Enzyme Catalysis and Immobilization
- Aquatic Ecosystems and Phytoplankton Dynamics
- Lanthanide and Transition Metal Complexes
- Layered Double Hydroxides Synthesis and Applications
- Biochemical and biochemical processes
Uppsala University
2012-2024
Virginia Commonwealth University
2008
University of Sheffield
2008
Stockholm University
2003-2005
Lund University
1997-2005
Chalmers University of Technology
1997-2003
KTH Royal Institute of Technology
1997-1999
Université Paris-Saclay
1998
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1998
CEA Paris-Saclay
1998
Photosynthesis is performed by a multitude of organisms, but in nearly all cases, it variations on common theme: absorption light followed energy transfer to reaction center where charge separation takes place. This initial form chemical stabilized the biosynthesis carbohydrates. To produce these energy-rich products, substrate needed that feeds reductive equivalents. When photosynthetic microorganisms learned use water as some 2 billion years ago, fundamental barrier against unlimited solar...
The photoinduced electron-transfer reactions in a Mn2II,II-RuII-NDI triad (1) ([Mn2(bpmp)(OAc)2]+, bpmp = 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenolate and OAc acetate, RuII tris-bipyridine ruthenium(II), NDI naphthalenediimide) have been studied by time-resolved optical EPR spectroscopy. Complex 1 is the first synthetically linked electron donor-sensitizer-acceptor which manganese complex plays role of donor. spectroscopy was used to directly demonstrate light induced formation...
In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidation primary electron donor P680, which subsequently retrieves electrons from tyrosyl residue, functioning as an interface oxygen-evolving manganese complex. first step toward mimicking these reactions, we have made Ru(II)−polypyridine complex with attached moiety. The photoexcited ruthenium played role P680 and was oxidized by external acceptors. Combined transient absorbance EPR studies...
The filamentous cyanobacterium Nostoc sp. strain PCC 7120 is capable of fixing atmospheric nitrogen. labile nature the core process requires terminal differentiation vegetative cells to form heterocysts, specialized with altered cellular and metabolic infrastructure mediate N2-fixing process. We present an investigation targeting proteomic expression heterocysts compared a population cultured under conditions. New 8-plex iTRAQ reagents were used on enriched replicate heterocyst cells,...
Abstract On the path to an energy transition away from fossil fuels sustainable sources, European Union is for moment keeping pace with objectives of Strategic Energy Technology-Plan. For this trend continue after 2020, scientific breakthroughs must be achieved. One main objective produce solar and water in direct processes accomplish efficient storage a chemical form. This grand challenge. important approach achieve goal Artificial Photosynthesis. The Research Alliance has launched Joint...
As a model for redox components on the donor side of photosystem II (PS II) in green plants, supramolecular complex 4 has been prepared. In this, ruthenium(II) tris-bipyridyl which mimics function P680 PS II, covalently linked to tyrosine unit bears two hydrogen-bonding substituents, dipicolylamine (dpa) ligands. Our aim is mimic interaction between tyrosineZ and basic histidine residue, namely His190 PSII, also use dpa ligands coordination manganese. Two different routes synthesis compound...
In plants, solar energy is used to extract electrons from water, producing atmospheric oxygen. This conducted by Photosystem II, where a redox "triad" consisting of chlorophyll, tyrosine, and manganese cluster, governs an essential part the process. Photooxidation chlorophylls produces electron transfer which forms radical. The radical cluster together providing biosphere with unlimited source. As partial model for this system we constructed ruthenium(II) complex covalently attached...
The uptake hydrogenase HupSL became a H<sub>2</sub>producer in<italic>N. punctiforme</italic>after modifying the proximal FeS cluster with single point mutation C12P.
The biosynthesis of jasmonates in plants is initiated by 13S-lipoxygenase (LOX), but details jasmonate fungi, including Fusarium oxysporum, are unknown. genome F. oxysporum codes for linoleate 13S-LOX (FoxLOX) and manganese LOX (Fo-MnLOX), an uncharacterized homolog 13R-MnLOX Gaeumannomyces graminis. We expressed Fo-MnLOX compared its properties to Cg-MnLOX from Colletotrichum gloeosporioides. Electron paramagnetic resonance metal analysis showed that contained catalytic Mn. oxidized 18:2n-6...
Artificial hydrogenases based on designed protein-inorganic hybrids are a promising venue to improve catalysis for sustainable fuel production.
To mimic the electron-donor side of photosystem II (PSII), three trinuclear ruthenium complexes (2, 2a, 2b) were synthesized. In these complexes, a mixed-valent dinuclear Ru2(II,III) moiety with one phenoxy and two acetato bridges is covalently linked to Ru(II) tris-bipyridine photosensitizer. The properties photoinduced electron/energy transfer studied. results show that moieties in readily undergo reversible one-electron reduction oxidation give Ru2(III,III) states, respectively. This...
Photoactivation of photosystem II has been studied in the FUD 39 mutant Chlamydomonas reinhardtii that lacks 23 kDa extrinsic subunit II. We have taken advantage slow photoactivation rate 39, earlier demonstrated Rova, E. M., et al. [(1996) J. Biol. Chem. 271, 28918−28924], to study events during intermediate stages process. By measuring EPR multiline signal, decay variable fluorescence after single flashes, and electron transfer from water QB site, we found a good correlation between...
The preparation of donor (D)-photosensitizer (S) arrays, consisting a manganese complex as D and ruthenium tris(bipyridyl) S has been pursued. Two new complexes containing coordinating sites for one (2a) two ions (3a) were prepared in order to provide models the side photosystem II green plants. site consists bridging terminal phenolate well pyridyl ligands. corresponding ruthenium-manganese complexes, monomer 2b dimer 3b, obtained. For our data suggest that intramolecular electron transfer...