Results 41 to 50 of about 907,608 (354)

Elucidation of the Electrocatalytic Function of Composite Metal Carbides Co3W3C and Co3Mo3C with Oxygen Reduction and Oxygen Evolution Reactions

Electrochemistry
Metal-air secondary batteries have attracted attention as a next-generation energy storage system due to their high energy density and environmentally friendly characteristics.
Ikki YANAGIMOTO, Masashi WADA, Satoko TAKASE, Toshiyuki TAKIZAWA, Youichi SHIMIZU   +4 more
doaj   +1 more source

The population of planetary nebulae and HII regions in M81. A study of radial metallicity gradients and chemical evolution

, 2010
We analyze the chemical abundances of planetary nebulae and HII regions in the M81 disk for insight on galactic evolution, and compare it with that of other galaxies, including the Milky Way. We acquired Hectospec/MMT spectra of 39 PNe and 20 HII regions,
Appleton, Asplund, Benjamin, Cahn, Clegg, Connolly, D. Galli, Davidge, Deharveng, Dors, Draine, E. Villaver, Fabricant, Freedman, Garnett, Garnett, Gordon, Gottesman, Henry, Hodge, Hodge, Jacoby, Karachentsev, Karakas, Kingsburgh, Kong, Käufl, L. Magrini, L. Stanghellini, Leisy, Lin, Maciel, Magrini, Magrini, Magrini, Magrini, Maraston, Marigo, Massey, Mathis, Mollá, Pagel, Perinotto, Perinotto, Rohlfs, Sabbi, Schönrich, Shaw, Stanghellini, Stanghellini, Stanghellini, Stanghellini, Stanghellini, Valle, Villaver, Walterbos, Weisz, Yun, Yun, Zaritsky   +59 more
core   +1 more source

O−O Bond Formation and Liberation of Dioxygen Mediated by N5‐Coordinate Non‐Heme Iron(IV) Complexes [PDF]

, 2019
Formation of the O−O bond is considered the critical step in oxidative water cleavage to produce dioxygen. High‐valent metal complexes with terminal oxo (oxido) ligands are commonly regarded as instrumental for oxygen evolution, but direct experimental ...
Diekmann, Marek, Grohmann, Andreas, Gülzow, Jana, Hörner, Gerald, Kroll, Nicole, Pfrommer, Johannes, Schlangen, Maria, Schoknecht, Marc, Speckmann, Ina, Stritt, Anika   +9 more
core   +1 more source

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

Reação de geração de oxigênio em eletrodos de Mn2O3 suportados em aço inoxidável Oxygen evolution reaction on Mn2O3 electrodes supported on stainless steel

Química Nova, 2000
A study of the kinetics of oxygen evolution in alkaline conditions from ceramic films of Mn2O3 supported on stainless steel was carried out. This study has been done through the determination of transfer coefficients, Tafel slopes and exchange currents ...
Hamilton Varela, Giuseppe A. Câmara, Hélio Scatena Júnior, Ernesto R. Gonzalez   +3 more
doaj   +1 more source

Development of Porous Pt Electrocatalysts for Oxygen Reduction and Evolution Reactions

Molecules, 2020
Porous Pt electrocatalysts have been developed as an example of carbon-free porous metal catalysts in anticipation of polymer electrolyte membrane (PEM) fuel cells and PEM water electrolyzers through the assembly of the metal precursor and surfactant. In
Marika Muto, Mayumi Nagayama, Kazunari Sasaki, Akari Hayashi   +3 more
doaj   +1 more source

Box Models of Volatile Cycles over the Entire Phanerozoic [PDF]

, 2006
Three stand-alone geochemical box models have been developed to simulate globally coupled biogeochemical cycles. These models reflect the evolution of the participating biotic and abiotic constituents in marine and terrestrial environments, including the
Bartdorff, Oliver
core  

Nucleosynthesis during the Merger of White Dwarfs and the Origin of R Coronae Borealis Stars [PDF]

, 2011
Many hydrogen deficient stars are characterised by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a ...
Asplund, Clayton, Cyburt, Fujimoto, Lugaro, Pandey, Pandey, Renedo, Renzini   +8 more
core   +3 more sources

Hematopoietic (stem) cells—The elixir of life?

FEBS Letters, EarlyView.
The aging of HSCs (hematopoietic stem cells) and the blood system leads to the decline of other organs. Rejuvenating aged HSCs improves the function of the blood system, slowing the aging of the heart, kidney, brain, and liver, and the occurrence of age‐related diseases.
Emilie L. Cerezo, Jonah Anderson, Emilie Dinh Vedrenne, Noël Yeh Martín, Jette Lengefeld   +4 more
wiley   +1 more source

Transition metal carbide‐based nanostructures for electrochemical hydrogen and oxygen evolution reactions

EcoEnergy, 2023
Extensive consumption of limited fossil fuel resources generates serious environmental problems, such as release of large amounts of the greenhouse gas CO2.
Md. Selim Arif Sher Shah, Gyu Yong Jang, Kan Zhang, Jong Hyeok Park   +3 more
doaj   +1 more source