A5050970552- Photosynthetic Processes and Mechanisms
- Electrocatalysts for Energy Conversion
- Metal-Catalyzed Oxygenation Mechanisms
- Electrochemical Analysis and Applications
- Algal biology and biofuel production
- Spectroscopy and Quantum Chemical Studies
- Photoreceptor and optogenetics research
- Porphyrin and Phthalocyanine Chemistry
- Metalloenzymes and iron-sulfur proteins
- Plant Stress Responses and Tolerance
- Microbial Fuel Cells and Bioremediation
- Electrochemical sensors and biosensors
- Mitochondrial Function and Pathology
- Metal complexes synthesis and properties
- Microbial Community Ecology and Physiology
- Magnetism in coordination complexes
- Light effects on plants
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Marine and coastal ecosystems
- CO2 Reduction Techniques and Catalysts
- Copper-based nanomaterials and applications
- Lanthanide and Transition Metal Complexes
- Microbial Metabolic Engineering and Bioproduction
- Amino Acid Enzymes and Metabolism
Rutgers, The State University of New Jersey
2015-2024
Rutgers Sexual and Reproductive Health and Rights
2007-2023
Ackerman Institute for the Family
2020
Czech Academy of Sciences, Institute of Microbiology
2012-2019
Rütgers (Germany)
2011-2018
Institute of Basic Biological Problems
2000-2013
Princeton University
2002-2012
University of Wollongong
2010
Monash University
2010
ARC Centre of Excellence for Electromaterials Science
2009
Manganese oxides occur naturally as minerals in at least 30 different crystal structures, providing a rigorous test system to explore the significance of atomic positions on catalytic efficiency water oxidation. In this study, we chose systematically compare eight synthetic oxide structures containing Mn(III) and Mn(IV) only, with particular emphasis five known structural polymorphs MnO2. We have adapted literature synthesis methods obtain pure validated their homogeneity crystallinity by...
Hydrogen is the most promising fuel of future owing to its carbon-free, high-energy content and potential be efficiently converted into either electrical or thermal energy. The greatest technical barrier accessing this renewable resource remains inability create inexpensive catalysts for solar-driven oxidation water. To date, efficient system that uses solar energy oxidize water photosystem II water-oxidizing complex (PSII-WOC), which found within naturally occurring photosynthetic...
Electron paramagnetic resonance of spinach chloroplasts given a series laser flashes, n = 0, 1,..., 6, at room temperature and rapidly cooled to -140 degrees C reveals signal possessing least 16 possibly 21 or more hyperfine lines when observed below 35 K. The spectrum is consistent with pair antiferromagnetically coupled Mn ions, tetramer in which Mn(III) Mn(IV) oxidation states are present. intensity this peaks on the first fifth suggesting cyclic change state period 4. multiline produced...
Crystalline Ni<sub>5</sub>P<sub>4</sub> evolves hydrogen with electrical-efficiency comparable to platinum—while being corrosion-resistant in both acid and base for >16 hours.
A photoelectrochemical cell was designed that catalyzes the photooxidation of water using visible light as sole energy source and a molecular catalyst, [Mn4O4L6]+ (1+, L = bis(methoxyphenyl)phosphinate), synthesized from earth-abundant elements. The essential features include photochemical charge separation system, [RuII(bipy)2(bipy(COO)2)], adhered to titania-coated FTO conductive glass, 1+ embedded within proton-conducting membrane (Nafion). complete photoanode represents functional...
Herein we describe the molecular Co(4)O(4) cubane complex Co(4)O(4)(OAc)(4)(py)(4) (1), which catalyzes efficient water oxidizing activity when powered by a standard photochemical oxidation source or electrochemical oxidation. The pH dependence of catalysis, turnover frequency, and in situ monitoring catalytic species have revealed intrinsic capabilities this core type. 1 analogous Mn(4)O(4) complexes is attributed to cubical topology, that nature's catalyst, CaMn(4)O(5) cluster.
ABSTRACT The accumulation of bioenergy carriers was assessed in two starchless mutants Chlamydomonas reinhardtii (the sta6 [ADP-glucose pyrophosphorylase] and sta7 - 10 [isoamylase] mutants), a control strain (CC124), complemented strains the mutant. results indicate that genetic blockage starch synthesis increases lipids on cellular basis during nitrogen deprivation relative to CC124 as determined by conversion fatty acid methyl esters. However, this increased level lipid is energetically...
The generation game: A manganese–oxo complex with a cubic {Mn4O4}7+ core catalyzes the electrooxidation of water when suspended within aqueous channels Nafion membrane (see picture). Illumination visible light under an applied potential 1.0 V (vs Ag/AgCl) generates current over one thousand turnovers. catalytically active species arises from photolysis and subsequent dissociation manganese complex. Supporting information for this article is available on WWW...
Nanocrystalline spinel LiMn2O4 has been prepared and treatment of with dilute nitric acid solution resulted in the delithiation framework, while maintaining structure, λ-MnO2. is not a catalyst for water oxidation. Upon removal lithium, cubical Mn4O4 cores become active sites oxidizing to molecular oxygen, which was investigated photochemical [Ru2+(2,2′-bpy)3]/persulfate system at pH 5.8. The nanosize λ-MnO2 obtained from nanocrystalline LiMn2O4, synthesized by citrate route, shows...
We report microcrystalline Ni3P as a noble-metal-free electrocatalyst for the H2 evolution reaction (HER) with high activity just below those of Ni5P4 and Pt, two most efficient HER catalysts known. has previously been dismissed HER, owing to its anticipated corrosion low when formed an impurity in amorphous alloys. observe higher single-phase crystallites than other nickel phosphides (except Ni5P4) acid, tolerance zero alkali. compare electrocatalytic performance, stability, intrinsic...
Bioinspired nickel phosphide electrocatalysts achieve breakthrough efficiency and selectivity for C<sub>3</sub>and C<sub>4</sub>products.
The evolution of O 2 -producing cyanobacteria that use water as terminal reductant transformed Earth's atmosphere to one suitable for the aerobic metabolism and complex life. innovation oxidation freed photosynthesis invade new environments visibly changed face Earth. We offer a hypothesis how this process evolved, which identifies two critical roles carbon dioxide in Archean period. First, we present thermodynamic analysis showing bicarbonate (formed by dissolution CO ) is more efficient...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear manganese(III) complexes of potential biological significanceJohn E. Sheats, Roman S. Czernuszewicz, G. Charles Dismukes, Arnold L. Rheingold, Vasili Petrouleas, JoAnne Stubbe, William H. Armstrong, Robert Beer, and Stephen J. LippardCite this: Am. Chem. Soc. 1987, 109, 5, 1435–1444Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed valence interactions in di-.mu.-oxo bridged manganese complexes. Electron paramagnetic resonance and magnetic susceptibility studiesStephen R. Cooper, G. Charles Dismukes, Melvin P. Klein, CalvinCite this: J. Am. Chem. Soc. 1978, 100, 23, 7248–7252Publication Date (Print):November 1, 1978Publication History Published online1 May 2002Published inissue 1 November...
Surface-directed corner-sharing MnO6 octahedra within numerous manganese oxide compounds containing Mn3+ or Mn4+ oxidation states show strikingly different catalytic activities for water oxidation, paradoxically poorest oxides, regardless of assay (photochemical and electrochemical). This is demonstrated herein by comparing crystalline oxides consisting (manganite, γ-MnOOH; bixbyite, Mn2O3), (pyrolusite, β-MnO2) multiple monophasic mixed-valence oxides. Like all pure β-MnO2 has no detectable...
Who can split water? Two polymorphs of nanocrystalline cubic spinel and rhombohedral layered lithium cobalt oxides have been prepared their application in the photocatalytic oxidation water examined. The main factor that determines catalytic activity different phases is presence a Co4O4 core, which present form catalyst, but not structure (see scheme). development catalysts (WOCs) to replace costly noble metals commercial electrolyzers solar fuel cells an unmet need preventing global...
Some aquatic microbial oxygenic photoautotrophs (AMOPs) make hydrogen (H(2)), a carbon-neutral, renewable product derived from water, in low yields during autofermentation (anaerobic metabolism) of intracellular carbohydrates previously stored aerobic photosynthesis. We have constructed mutant (the ldhA mutant) the cyanobacterium Synechococcus sp. strain PCC 7002 lacking enzyme for NADH-dependent reduction pyruvate to D-lactate, major fermentative reductant sink this AMOP. Both nuclear...