• Design criteria for stable Pt/C fuel cell catalysts. (nature.com)
  • This review describes major advances in the use of functionalized molecular metal oxides (polyoxometalates, POMs) as water oxidation catalysts under electrochemical conditions. (mdpi.com)
  • The fundamentals of POM-based water oxidation are described, together with a brief overview of general approaches to designing POM water oxidation catalysts. (mdpi.com)
  • Proton exchange membrane water electrolysers require the development of active, stable and cost-effective catalysts for water oxidation. (nature.com)
  • Replacing enzymes with more stable and cheaper oxidation catalysts will reduce the cost of glucometers and extend their shelf life. (eurekalert.org)
  • Water-soluble organic carbon (WSOC) is formed by oxidation of organic compounds in particulate matter (PM) and accounts for 25-80% of the organic carbon in PM. Stable carbon isotope ratio (δ13 C) analysis is widely used to identify the sources of PM, but determining the δ13 C values of WSOC is complicated and requires a time-consuming pretreatment process. (eurekamag.com)
  • We have developed an online wet oxidation/isotope ratio mass spectrometry method with a reduced pretreatment time. (eurekamag.com)
  • Promethium-145 is the most stable promethium isotope, but the only isotope with practical applications is promethium-147, chemical compounds of which are used in luminous paint , atomic batteries and thickness-measurement devices. (wikipedia.org)
  • Livermorium's most stable isotope , livermorium-293, has a half-life of about 53 milliseconds. (jlab.org)
  • Pawlosky RJ, Flanagan VP, Pfeiffer CM. Determination of 5-methyltetrahydrofolic acid in human serum by stable-isotope dilution high-performance liquid chromatography-mass spectrometry external icon . (cdc.gov)
  • The locations of the extracted platinum atoms after Pt(100) oxidation reveal distinct differences from the Pt(111) case, which explains the different surface stability. (nature.com)
  • Now, a Ru/α-MnO 2 catalyst with in-situ-formed arrays of Ru atoms is presented for acidic water oxidation, which follows the oxide path mechanism and achieves enhanced activity and stability. (nature.com)
  • These findings suggest the possibility of utilizing these high-entropy alloys for applications where high thermal stability and oxidation resistance are required. (nanowerk.com)
  • While during the oxidation process, the GO composition and the structure do not change significantly after reaching a threshold oxidation degree, implying the chemical stability of functional groups in the oxidizing medium. (mis-asia.com)
  • Good thermal/oxidation stability protects against the formation of deposits and oil thickening prolonging the life of components and lubricant. (castrol.com)
  • Huang, Y.-F., Kooyman, P. J. & Koper, M. T. M. Intermediate stages of electrochemical oxidation of single-crystalline platinum revealed by in situ Raman spectroscopy. (nature.com)
  • The resulting new material has significant catalytic activity in the electrochemical oxidation of glucose. (eurekalert.org)
  • It incorporates the highest quality, thermally stable synthetics fortified with premium non-detergent additives for maximum protection at high temperatures. (amsoil.com)
  • It is flame-retardant, thermally stable and resistant to oxidation, ozone and radiation. (photonics.com)
  • Several studies have been devoted to understanding the corrosion behaviors of HEAs such as oxidation in air and oxygen-containing atmospheres. (nanowerk.com)
  • Inconel 718 has good oxidation and corrosion resistance at temperatures within the useful strength range of the alloy in the atmosphere encountered in the operation of jet engines and gas turbines. (nmfbihop.com)
  • Conclusion: The two solutions of peracetic acid were effective in the disinfection process, with the solution without corrosion inhibitor stable for a longer period. (bvsalud.org)
  • 8-10 Oxidation of surface atoms in ZVI in aqueous environments produces radicals that can chemically breakdown drinking water pollutants. (rsc.org)
  • the common oxidation state is +3, in which state, the behavior of americium and other actinides is similar to the lanthanides. (cdc.gov)
  • Traditional metals or alloys are believed to form crystalline oxides based on the composition and oxidation conditions, but when five or more principle elements are involved in a single phase, novel behavior during oxidation may exist due to the built-in high entropy,' Boao Song from the Department of Mechanical and Industrial Engineering at the University of Illinois at Chicago, and the paper's first author, tells Nanowerk. (nanowerk.com)
  • The +2 oxidation state is very unstable and has only been produced in solid compounds. (cdc.gov)
  • Two just-reported examples are the synthesis of a dichromium complex with the shortest metal-metal bond length on record and the synthesis of the first stable magnesium(I) compounds that also happen to contain rare Mg-Mg bonds. (acs.org)
  • In the dimagnesium case, chemists are just getting over the shock that stable Mg(I) compounds actually exist, and now they can decide what to make of them. (acs.org)
  • This perspective focuses on two areas that have yielded new useful information during the last 20 years: (i) structure-activity relationship (SAR) studies of contact allergy based on the concept of hapten-protein binding and (ii) mechanistic investigations regarding activation of nonsensitizing compounds to contact allergens by air oxidation or skin metabolism. (cdc.gov)
  • Many compounds are not allergenic themselves but are activated in the skin (e.g., metabolically) or before skin contact (e.g., via air oxidation) to form skin sensitizers. (cdc.gov)
  • The clinical importance of air oxidation to activate nonallergenic compounds has been demonstrated. (cdc.gov)
  • mechanistic investigations regarding activation of nonsensitizing compounds to contact allergens by air oxidation or skin metabolism. (cdc.gov)
  • A combination of 1,1,1,3,3,3-hexafluoroispropanol (HFIP) and H 2 O 2 enables a straightforward synthesis of N,N -disubstituted formamides from imines in very good yields via an oxidation-rearrangement sequence under smooth reaction conditions. (organic-chemistry.org)
  • At the same time, in contrast to analogs, the oxidation reaction effectively proceeds in a neutral medium of a phosphate buffer solution, which corresponds to the acidity of human blood. (eurekalert.org)
  • Fig. 1: Dissolution and atomic-scale structural changes during Pt oxidation. (nature.com)
  • Americium is a human-made actinide element (atomic number 95) and has no stable isotopes. (cdc.gov)
  • I want to get the latest chemistry news from C&EN in my inbox every week. (acs.org)
  • Interesting - conductive, relatively stable and resistant to oxidation. (reprap.org)
  • This is possible because Nextel 440 is inherently oxidation resistant, light weight, electrically insulating and flexible. (3m.com)
  • The use of urea-hydrogen peroxide as terminal oxidant in the presence of diphenyl diselenide as catalyst enables a highly selective catalytic oxidation of sulfides into the corresponding sulfoxides. (organic-chemistry.org)
  • A general, high yielding, and user and environmentally friendly catalytic oxidation procedure for the chemoselective oxidation of imines to nitrones is reported. (organic-chemistry.org)
  • Platinum dissolution and restructuring due to surface oxidation are primary degradation mechanisms that limit the lifetime of platinum-based electrocatalysts for electrochemical energy conversion. (nature.com)
  • Some are intended to protect against oxidation, others support the effects of the first group, and others eliminate substances that accelerate fat degradation. (foodnavigator.com)
  • A new research report in ACS Nano ( ' In Situ Oxidation Studies of High-Entropy Alloy Nanoparticles' ) offers key insights into how HEA nanoparticles behave under high-temperature oxidizing environment and sheds light on future design options of highly stable alloys under complex service conditions. (nanowerk.com)
  • Schematic illustration of the oxidation process of high-entropy alloy nanoparticles. (nanowerk.com)
  • We were intrigued to find out that the transition metals in HEA nanoparticles can co-segregate into the oxide layer and form a disordered phase that can slow down the whole oxidation process. (nanowerk.com)
  • For the first time, this work directly captured the whole oxidation process of HEA nanoparticles in real-time and at the nanoscale. (nanowerk.com)
  • It also confirms the much slower oxidation kinetics of HEA nanoparticles. (nanowerk.com)
  • Schematic of the in situ gas-cell (S)TEM device to study the oxidation of HEA nanoparticles. (nanowerk.com)
  • The researchers managed to successfully capture the high-temperature oxidation of FeCoNiCuPt HEA nanoparticles in real-time by utilizing the advanced in situ gas-cell transmission electron microscopy (TEM) technique combined with density functional theory (DFT) calculations. (nanowerk.com)
  • We found that the oxidation kinetics of HEA nanoparticles are significantly slower than those of monometallic and bimetallic alloys,' says Song. (nanowerk.com)
  • Combining in situ energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) analyses, we confirmed that the oxidation of HEA nanoparticles are governed by Kirkendall effects displaying outwards segregation of Fe, Co, Ni and Cu. (nanowerk.com)
  • For example, the mechanism that controls the oxidation process and why the differences are so huge compared to monometallic nanoparticles is still unknown. (nanowerk.com)
  • Morphological changes resulting from the oxidation of zero valent iron (ZVI) nanoparticles were measured as an assessment of their mechanical robustness in mixed matrix membranes for water treatment applications. (rsc.org)
  • Additionally a metabolism study with [1′-C-13, 3′, 3′-H-2(2)]-hyoscyamine has established that the alkaloid is metabolically stable at C-3′ with no evidence for a reversible in vivo oxidation process to the corresponding aldehyde. (sinapse.ac.uk)
  • The advanced in situ transmission electron microscopy (TEM) technique used by the UIC team allows real-time imaging and analytical methods, and thus provides clear evidence of the co-segregation of transition metals during the oxidation process. (nanowerk.com)
  • Transition metals are well known for having more than one stable oxidation state. (sserc.org.uk)
  • Also like other transition metals, these oxidation states are coloured. (sserc.org.uk)
  • UHP is used in an efficient solid state oxidation of different organic molecules: hydroxylated aldehydes and ketones (to hydroxylated phenols), sulfides (to sulfoxides and sulfones), nitriles (to amides) and nitrogen heterocycles (to N -oxides). (organic-chemistry.org)
  • The dependences of the nature, electronic relaxation, dynamics of paramagnetic centers, and the charge transfer mechanism on the method of synthesis, the structure of the acid molecule, and the polyaniline oxidation level are shown. (researchgate.net)
  • The Great Oxidation Event ( GOE ) or Great Oxygenation Event , also called the Oxygen Catastrophe , Oxygen Revolution , Oxygen Crisis or Oxygen Holocaust , [2] was a time interval during the Early Earth 's Paleoproterozoic Era when the Earth's atmosphere and the shallow ocean first experienced a rise in the concentration of oxygen . (wikipedia.org)
  • When the Fatty acid (FA) oxidation capacity in the muscle decreases, the intramyocellular lipid concentration increases ( 5 ). (frontiersin.org)
  • 58 exposed to the allergen in a concentration exceeding the Oxidation individual threshold. (cdc.gov)
  • Plasma lipoprotein, plasma lipid peroxide, and LDL oxidation studies were performed every 6 weeks. (mapi.com)
  • Other functions of MPO include tyrosyl radical production and chlorination, generation of tyrosine peroxide, mediation of the adhesion of myeloid cells via b2-integrins, and oxidation of serum lipoproteins. (medscape.com)
  • Fazili Z, Whitehead RD Jr, Paladugula N,Pfeiffer CM. A high-throughput LC-MS/MS method suitable for population biomonitoring measures five serum folate vitamers and one oxidation product external icon . (cdc.gov)
  • Under chronic hyperinsulinemia, FA oxidation progressively decreases with a consequent alteration in glucose transport, and/or phosphorylation pathways associated with normal glucose uptake ( 5 ). (frontiersin.org)
  • Promethium shows only one stable oxidation state of +3. (wikipedia.org)
  • Under normal environmental conditions, only the +2 oxidation state is stable enough to be important. (cdc.gov)
  • Copper sulphate is an inorganic salt with copper in a high oxidation state. (europa.eu)
  • The oxygen in copper sulphate pentahydrate is bound in stable sulphate structural groupings with strong oxygen bonds. (europa.eu)
  • Fat oxidation can be assessed clinically by measuring respiratory quotient (RQ), which is the ratio of the carbon dioxide expired to the oxygen consumed during indirect calorimetry. (frontiersin.org)
  • You, H., Zurawski, D. J., Nagy, Z. & Yonco, R. M. In-situ x-ray reflectivity study of incipient oxidation of Pt(111) surface in electrolyte solutions. (nature.com)
  • Fraunhofer researchers say they saw an opportunity to add omega-3s to foods that were particularly popular in Germany, like bread, sausages, pasta and pizza, thereby increasing consumption - but first they had to overcome the fishy smell of omega-3 fats, which are susceptible to oxidation. (foodnavigator.com)
  • Researchers have demonstrated that patients with stable coronary artery disease had an increased cardiovascular risk if plasma MPO levels were elevated. (medscape.com)
  • All are stable groupings in high oxidation states. (europa.eu)
  • High RQ values are indicative of low fat oxidation and high carbohydrate oxidation ( 7 ). (frontiersin.org)
  • and remains stable in adverse weather and other water-exposure conditions. (exxonmobil.com)
  • Copper sulphate is therefore considered inert under the conditions of oxidation. (europa.eu)
  • Oxidation also requires specific conditions. (ukessays.com)
  • The headspace of the ampoules is replaced with nitrogen during the filling process to prevent oxidation of the API. (who.int)
  • Good foam control reduces heat, oxidation and wear. (amsoil.com)
  • Low-density lipoprotein (LDL) oxidation is central to the pathogenesis of atherosclerosis. (mapi.com)
  • AMSOIL PC Series Oil has low friction properties, resists viscosity increase from oxidation and helps improve operating efficiency. (amsoil.com)
  • Negative plasmon dispersion in 2H-NbS2 beyond charge-density-wave interpretation- Stable monolayer honeycomb-like structures of RuX2 X S, Se. (dtic.mil)
  • Next, the use of POMs for homogeneous, solution-phase water oxidation is described together with a summary of theoretical studies shedding light on the POM-WOC mechanism. (mdpi.com)
  • The slurry output is uniform and stable, the density of the foam concrete finished product i. (mis-asia.com)
  • The use of urea-hydrogen peroxide and phthalic anhydride in ethyl acetate enables a metal-free, environmentally benign oxidation of substituted sulfides to their corresponding sulfones without observation of the possible sulfoxide oxidation product. (organic-chemistry.org)
  • 3M™ Nextel™ Tape BP-18 is designed to meet the toughest thermal, mechanical and electrical performance requirements for applications that require a narrow, edge stable woven product. (3m.com)
  • The data provided show that the product is not stable at 30°C and it should be stored at not above 25°C, with avoidance of excursions above this temperature. (who.int)
  • Copper sulphate is a stable inorganic substance. (europa.eu)
  • Conclusions: Our results pave the way for stable transformation of plants to be used as biological pheromone sources in different pest control strategies. (lu.se)
  • While the perception that surface oxidation of ZVI may limit the longer term use of these materials, studies focusing on the post-treatment of ZVI have demonstrated that the activity of ZVI can be renewed with post-treatment, making them attractive for long-term purification applications. (rsc.org)
  • Actually psilocin is the less stable of the two, and you usually lose a good percentage of it when drying. (shroomery.org)
  • First stable Mg(I) compound also sports a rare Mg-Mg bond. (acs.org)
  • They are very stable due to large resonance energy. (ukessays.com)
  • Strontium can exist in two oxidation states: 0 and +2. (cdc.gov)
  • The results show that MAK-4 and MAK-5 inhibit LDL oxidation in patients with hyperlipidemia. (mapi.com)
  • Eco-friendly laboratory procedures allow the oxidative iodination of various activated and deactivated arenes with molecular iodine, in the presence of UHP (percarbamide), a stable, strongly H-bonded, solid urea-hydrogen peroxide adduct as the oxidant. (organic-chemistry.org)
  • Although the event is inferred to have constituted a mass extinction , [7] due in part to the great difficulty in surveying microscopic organisms' abundances, and in part to the extreme age of fossil remains from that time, the Great Oxidation Event is typically not counted among conventional lists of "great extinctions", which are implicitly limited to the Phanerozoic eon . (wikipedia.org)
  • After 12 weeks of treatment with MAK-4 and MAK-5 , a time-dependent increase in the lag phase and delay in the propagation phase of oxidation of LDL by Cu+2 and endothelial cells was seen. (mapi.com)