Results 91 to 100 of about 658,769 (293)

Metal‐Ion Regulated Light‐Free Z→E Isomerization of Azobenzene Glycomacrocycle

Chemistry – A European Journal, EarlyView.
Metal ion‐catalyzed Z→E isomerization of photoswitchable azobenzene glycomacrocycle: A new azobenzene‐based glycomacrocycle is capable of forming a 1:1 complex with divalent metal ions in both E‐ and Z‐isomers. The complexes undergo light‐free Z→E isomerization in a timescale spanning from seconds to weeks.
Yang Zhou, Jinbiao Jiao, Mathieu Lordez, Jean‐Yves Salpin, Juan Xie   +4 more
wiley   +1 more source

A strontium (87Sr/86Sr) isoscape of Southern Ethiopia: implications for hominin land use and faunal mobility patterns

Frontiers in Environmental Archaeology
Tracing human and animal mobility behavior, land use, and exploitation strategies through strontium (Sr) isotope analysis is critical for archaeological and palaeoecological research.
Seminew Asrat, Seminew Asrat, Francesco Lucchini, Mary Anne Tafuri, Caterina Aureli, Marina Gallinaro, Andrea Zerboni, Marianna Fusco, Enza E. Spinapolice   +8 more
doaj   +1 more source

Bismuth Chalcogenide‐Based Photocatalysts for Nitrogen Reduction: Recent Progress and Prospects

Chemistry – A European Journal, EarlyView.
Bismuth chalcogenides emerge as promising visible‐light photocatalysts for sustainable ammonia synthesis, driven by tunable electronic structures and strong N2 activation. Recent advances reveal how defects, doping and heterojunction design synergistically enhance charge separation and reactivity. Key challenges and future directions highlight pathways
Mukesh K. Verma, Muhammad D. Bala, Phindile B. Khoza, Tshephiso R. Papo, Mzamo L. Shozi   +4 more
wiley   +1 more source

Stable isotope dilution techniques for assessing vitamin A status and bioefficacy of provitamin A carotenoids in humans. [PDF]

, 2005
Vitamin A deficiency is a major global public health problem. Among the variety of techniques that are available for assessing human vitamin A status, evaluating the provitamin A nutritional values of foodstuffs and estimating human vitamin A ...
Judy D Ribaya-Mercado, Emorn Wasantwisut, Marjorie Haskell, Sherry Tanumihardjo, Harold C Furr, Wasantwisut, Emorn, Tang, Guangwen, Penelope Nestel, Sam Newton, Guangwen Tang, Haskell, Marjorie, Ribaya-Mercado, Judy D, Najat Mokhtar, Furr, Harold C, Nestel, Penelope, Newton, Sam, Tanumihardjo, Sherry, Green, Michael H, Michael H Green, Mokhtar, Najat   +19 more
core   +1 more source

δ26Mg, δ44Ca and 87Sr/86Sr isotope ratios constrain Mg and Ca input–output mass balances in a heavily acidified headwater catchment

Environmental Sciences Europe
A Central European catchment underlain by base-poor orthogneiss was studied using mass budgets and Mg–Ca–Sr isotope systematics. For 50 years, the catchment received large amounts of partly soluble dust from a nearby cluster of coal-burning power plants,
Martin Novak, Frantisek Veselovsky, Jakub Hruška, Chris Holmden, Alexandre V. Andronikov, Yulia V. Erban Kochergina, Vaclav Kachlik, Marketa Stepanova, Ondrej Pour, Ondrej Sebek, Eva Prechova, Arnost Komarek, Jan Curik, Frantisek Laufek, Irina E. Andronikova, Daniela Fottova, Pavla Holeckova, Tomas Paces   +17 more
doaj   +1 more source

Experimental methods in chemical engineering: Temperature‐programmed oxidation—TPO

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Temperature‐programmed oxidation (TPO) probes the oxidative capacity and redox properties of solid materials—catalysts, metal oxides, perovskites, and carbonaceous deposits. It identifies coke type, distribution, and reactivity. TPO instruments pass an oxidizing gas (diluted O2$$ {\mathrm{O}}_2 $$, air, or less commonly N2O$$ {\mathrm{N}}_2 ...
Gholamreza Roohollahi, Jildimara de Jesus Santana, Alexander R. P. Harrison, Sara Andreoli, Ewa Marek, Stuart Scott, Mohammad Latifi, Gregory S. Patience   +7 more
wiley   +1 more source

Stable oxygen and carbon isotope compositional fields for skeletal and diagenetic components in New Zealand Cenozoic nontropical carbonate sediments and limestones: A synthesis and review [PDF]

, 1996
The stable oxygen isotope composition (δ18O) of a precipitated carbonate depends mainly on the isotope composition, salinity, and temperature of the host fluid, whereas the stable carbon isotope composition (δ13C) reflects the source of CO2 for ...
Nelson, Campbell S., Campbell S. Nelson, Smith, Abigail M., Abigail M. Smith   +3 more
core   +1 more source

Polyoxometalates in Photocatalytic CO2 Reduction: Multielectron Redox Regulation Across Molecular and Hybrid Architectures

EcoEnergy, EarlyView.
This review focuses on multielectron redox regulation across molecular and hybrid architectures for photocatalytic CO2 reduction, covering intrinsic POM photocatalysts, photosensitizer‐assisted assemblies, POM–metal–organic complexes, and POM‐integrated semiconductors and MOF/COF heterostructures to link structural motifs with charge transport, product
Bonan Li, Xiaowen Ruan, Sai Kishore Ravi
wiley   +1 more source

Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques [PDF]

, 2009
Internationally distributed organic and inorganic oxygen isotopic reference materials have been calibrated by six laboratories carrying out more than 5300 measurements using a variety of high-temperature conversion techniques (HTC) in an evaluation ...
Weise, Stephan M., Mroczkowski, S. J., Brand, Willi A., Qi, H., Stuart-Williams, Hilary,, Geilmann, Heike, Aerts-Bijma, A. T., Weise, S. E., Jansen, H., Geilmann, Heike,, Qi, Haiping, Coplen, T. B., Bohlke, J., Coplen, Tyler B.,, J. K. Böhlke, Qi, H. P., Aerts-Bijma, Anita T.; id_orcid, Meijer, Harro A. J., Weise, S., Soergel, Karin,, Groning, M., Böhlke, J.K., Gröning, Manfred,, Stephan M. Weise, Gröning, Manfred, Haiping Qi, Anita T. Aerts‐Bijma, Jansen, Henk G.,, Heike Geilmann, Meijer, H. A. J., Gehre, Matthias, Jansen, Henk G., Meijer, Harro A. J.; id_orcid, Roland A. Werner, Werner, Roland A.,, Coplen, Tyler B., Böhlke, J.K.,, Werner, R., Werner, Roland A., Geilmann, H., Jansen, H. G., Aerts-Bijma, Anita T., Stuart-Williams, H., Karin Soergel, Henk G. Jansen, Stanley J. Mroczkowski, Aerts-Bijma, Anita T.,, Gehre, Matthias,, Gehre, M., Bohlke, J. K., Mroczkowski, Stanley J.,, Meijer, Harro A.J.,, Meijer, H., Mroczkowski, S., Mroczkowski, Stanley J., Brand, W., Tyler B. Coplen, Soergel, Karin, Hilary Stuart‐Williams, Weise, Stephan M.,, Willi A. Brand, Aerts-Bijma, A., Matthias Gehre, Brand, Willi A.,, Manfred Gröning, Soergel, K., Coplen, T., Qi, Haiping,, Stuart-Williams, Hilary, Harro A. J. Meijer   +69 more
core   +1 more source

Random forest-based bioavailable strontium isoscape for environmental and archaeological applications in central eastern Argentina and western Uruguay.

PLoS ONE
Bioavailable strontium (Sr) isoscapes are essential tools in studies on environmental processes, animal and human mobility and provenance. The success of these studies relies on the comparison between the measured 87Sr/86Sr isotope ratios of specimens ...
Cinzia Scaggion, Tommaso Giovanardi, Daniel Loponte, Mirian Carbonera, Elena Armaroli, Sara Bernardini, Stefano Benazzi, Andrés Gascue, Alejandro Acosta, Giulia Marciani, Eugenio Bortolini, Anna Cipriani, Federico Lugli   +12 more
doaj   +1 more source