The hydrogen/deuterium primary kinetic isotope effect provides useful information about the degradation mechanism of OLED host materials. (rsc.org)
In theory, replacing hydrogen with deuterium "reinforces" the bond due to the kinetic isotope effect, and such reinforced biomolecules taken up by the body will be more resistant to ROS. (wikipedia.org)
The kinetic isotope effect for β-hydride elimination from alkyliridium(I) complexes has bee found to be k H /k D = 2.28 ± 0.20. (princeton.edu)
We call this the kinetic isotope effect," explains Prof. Dr. Andreas Gansäuer of the Kekulé Institute for Organic Chemistry and Biochemistry at the University of Bonn. (uni-bonn.de)
Hydrogen isotope exchange in tungsten: Discussion as removal method for tritium. (mpg.de)
While the USA had stopped producing tritium by about 1988 due to safety reasons and ageing facilities, the Indian breakthrough underscores the fact that tritium can now be produced at a fraction of the estimated US$ 7 billion needed to produce the isotope at current costs using the accelerator process, as was done in the USA. (ccnr.org)
The pellet Moses holds is a model, but the real version will contain a few milligrams of deuterium and tritium, isotopes of hydrogen that can be extracted from water. (newsweek.com)
But instead of splitting the nucleus of an atom, you're trying to force a deuterium nucleus to merge, or fuse, with a tritium nucleus. (newsweek.com)
But next year Moses and his scientists will fire it up with a full load of deuterium-tritium fuel, and Moses feels confident it will achieve "ignition," meaning a controlled burn in which you get out more energy than you put in. (newsweek.com)
Radioactive4
A heavy isotope diet is one in that contains nutrients in which some atoms are replaced with their heavier non-radioactive isotopes, such as deuterium 2H or heavy carbon 13C. (wikipedia.org)
Because of the specificity of its uptake by the human body, radioactive isotopes of iodine can also be used to treat thyroid cancer . (wikipedia.org)
The part that scientists didn't understand until about 100 years ago is that certain elements have isotopes that are radioactive. (howstuffworks.com)
H 2 O with one deuterium atom is called semi-heavy water, because the additional neutron increases its density. (universetoday.com)
Trapping of hydrogenisotopes in radiation defects formed in tungsten by neutron and ion irradiations. (mpg.de)
Deuterium trapping at defects created with neutron and ion irradiations in tungsten. (mpg.de)
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus , while normal hydrogen has only a proton. (dictionary.com)
An isotope of hydrogen called "deuterium" has one proton plus one neutron in its nucleus. (windows2universe.org)
Neutron crystallography is emerging as a unique and highly promising technique for structural biology because, unlike other techniques, it can probe the locations of protons (or more specifically the heavier isotope deuterium) which are paramount for understanding biochemical processes, e.g. the hydrogen-bond pattern, the charge and tautomeric states, as well as the interactions with the surrounding solvent. (lu.se)
LP3 is colocalised with and closely collaborates with the DEMAX platform of the ESS on production of deuterium labeled biomolecules (proteins, lipids) for neutron scattering experiments and the development of methods for crystal growth for neutron crystallography. (lu.se)
Atoms5
Deuterated medicinal chemistry is an attempt to introduce deuterium into existing drug molecules through the replacement of hydrogen atoms (-H) with deuterium (-D). The process of deuteration is to reduce the rates of breaking the carbonhydrogen bond. (informaticsjournals.com)
Atoms of both isotopes of copper have 29 protons, but a copper-63 atom has 34 neutrons while a copper-65 atom has 36 neutrons. (howstuffworks.com)
The authors ascribed these two new peaks to single D atom-adsorbed buckyballs with different amounts of carbon isotopes ( 12 C and 13 C). The presence of the two new peaks clearly showed that buckyballs could host hydrogen atoms to enhance the spillover effect. (rsc.org)
Biomolecules that incorporate heavier isotopes give rise to more stable molecular structures, which is hypothesized to increase resistance to damage associated with ageing or diseases. (wikipedia.org)
For assessing the folate content in a range of Brazilian PANCs, we extended the validation of an existing stable isotope dilution assay (SIDA) for the stably 13 C-labelled 10-formyl-Pte[ 13 C 5 ]Glu (10-CHO-Pte[ 13 C 5 ]Glu). (frontiersin.org)
In: Tongiorgi E (ed) Stable isotopes in oceanographic studies and paleotemperatures. (springer.com)
Friedman I, O'Neil JR (1977) Compilation of stable isotope fractionation factors of geochemical interest. (springer.com)
Gao YW, Beamish RJ (2003) Stable isotope variations in otoliths of Pacific halibut ( Hippoglossus stenolepis ) and indications of the possible 1990 regime shift. (springer.com)
Kalish JM (1991) Oxygen and carbon stable isotopes in the otoliths of wild and laboratory-reared Australian salmon ( Arripis trutta ). (springer.com)
Schwarcz HP, Gao Y, Campana S, Browne D, Knyf M, Brand U (1998) Stable carbon isotope variations in otoliths of cod ( Gadus morhua ). (springer.com)
Such adulterations are detectable by a combination of analytical techniques based on stable isotope ratio analysis (SIRA). (environmental-expert.com)
Heavier1
Researchers at the University of Bonn have presented a method that allows the heavier hydrogen "brother" deuterium to be introduced specifically into many different molecules. (uni-bonn.de)
Nucleus1
A deuteron (the nucleus of an isotope of hydrogen) has a mass of [tex] m_D [/tex] and a charge of e. (physicsforums.com)
Proton1
We show by absence of a deuterium isotope effect on the proton transfer that the ESIPT dynamics is entirely determined by the skeletal modes and that it should not be described by tunneling of the protons. (uni-muenchen.de)
Carbon5
Deuterium retention in carbon fibre composite irradiated with low-energy D ions. (mpg.de)
Deuterium Retention in Carbon Fibre Composite Materials. (mpg.de)
DeNiro MJ, Epstein S (1976) You are what you eat (plus a few permil): the carbon isotope cycle in food chains. (springer.com)
DeNiro MJ, Epstein S (1978) Influence of diet on the distribution of carbon isotopes in animals. (springer.com)
Grossman EL, Ku TL (1986) Oxygen and carbon isotope fractionation in biogenic aragonite: temperature effects. (springer.com)
Ratios1
Devereux I (1967) Temperature measurements from oxygen isotope ratios of fish otoliths. (springer.com)
Molecules3
Deuterium isotope effects (DIEs) in C-13 NMR spectra of SAN isotopomers have been compared with those observed in the corresponding isotopomers of related binuclear aromatic molecules. (irb.hr)
As shown in Figure 2, after treating the buckyball and Pt-loaded KB with deuterium molecules (D 2 ), the spectrum (red) exhibited two additional peaks with m/z of ~723.5 and ~724.5 (highlighted by arrows in the figure) compared to those of the buckyball reference (black) and the buckyball and Pt-loaded KB prior to D 2 dosage (blue). (rsc.org)
Pictures on the right show the molecular structure of a buckyball molecule and two deuterium-incorporated buckyball molecules (with different number of 13C isotope). (rsc.org)
Uptake1
1994. Gas uptake studies of deuterium isotope effects on dichloromethane metabolism in female B6C3F1 mice in vivo . (cdc.gov)
Also, the drugs experimented with using deuterium are discussed as how deuterated chemistry can help fight antimicrobial resistance. (informaticsjournals.com)
This means that introducing deuterium instead of protium into drugs causes them to have a longer effect. (uni-bonn.de)
Retention10
Deuterium retention in CFC irradiated with low-energy D ions. (mpg.de)
Deuterium retention in reduced activation ferritic/martensitic steel EUROFER97 exposed to low-energy deuterium plasma. (mpg.de)
Surface modification and deuterium retention in reduced activation ferritic martensitic steels exposed to low-energy, high flux D plasma and D 2 gas. (mpg.de)
The effect of displacement damage on deuterium retention in tungsten exposed to D neutrals and D 2 gas. (mpg.de)
Deuterium retention in tungsten damaged with W ions to various damage levels. (mpg.de)
Deuterium retention in single-crystal tungsten irradiated with 10-500 eV/D + . Journal of Nuclear Materials 438 , pp. (mpg.de)
The effect of displacement damage on deuterium retention in ITER-grade tungsten exposed to low-energy, high-flux pure and helium-seeded deuterium plasmas. (mpg.de)
Temperature dependence of surface morphology and deuterium retention in polycrystalline ITER-grade tungsten exposed to low-energy, high-flux D plasma. (mpg.de)
Deuterium retention in plasma spray tungsten coatings exposed to low-energy, high flux D plasma. (mpg.de)
Deuterium retention in porous vacuum plasma-sprayed tungsten coating exposed to low-energy, high-flux pure and helium-seeded D plasmas. (mpg.de)
Separation4
Herein the use of this material for H 2 /D 2 isotope separation is demonstrated. (bris.ac.uk)
Isotope separation was achieved using breakthrough separation with a single pass through a packed bed at moderate temperatures (293 K) and pressures (0.17 MPa) when one species was in a sufficiently low concentration. (bris.ac.uk)
Use of this material for hydrogen isotope separation would significantly lower the total energy demand compared with current hydrogen isotope separation techniques such as cryogenic distillation and is applicable to separating out low concentrations of D 2 (0.0156%) present in standard grade H 2 . (bris.ac.uk)
Herein the use of this material for H2/D2 isotope separation is demonstrated. (bris.ac.uk)
This allows us to introduce a deuterium atom at a single location and with a very specific and desired spatial orientation," Gansäuer says. (uni-bonn.de)
Effects4
The use of deuterium isotope effects to probe the active site properties, mechanism of cytochrome P450-catalyzed reactions, and mechanisms of metabolically dependent toxicity. (informaticsjournals.com)
5 ], were undertaken to characterize the critical behavior in the system and clarify and describe substantial isotope effects on liquid miscibility. (hindawi.com)
In these studies, they observed a shrinking of the miscibility gap in the presence of THF- d8 and a widening of the gap in the presence of D 2 O. Isotope effects are also evident in the crystal structure determinations of clathrate hydrates, due to the covalent distances being longer and the hydrogen bonds being stronger in D 2 O than those in H 2 O. (hindawi.com)
Solvent deuterium isotope effects on kcat/KM and kcat were inverse and unity, respectively. (bvsalud.org)
Tungsten1
Deuterium ion-driven permeation through tungsten. (mpg.de)
Compounds1
Herein, we developed different reaction conditions to enable the site-selective Cp*Co-catalyzed deuteration of aromatic compounds containing up to twenty prevalent coordinating directing groups, with two readily available deuterium sources, D2O and CD3OD. (iciq.org)
Mechanism1
By modelling the data obtained in the reaction scope through multivariable linear regression (MLR), we suggest that a shift in the substrate-dependent mechanism dictates the need for a specific source of deuterium. (iciq.org)
Temperature1
Gauldie RW, West IF, Coote G, Merrett N (1995) Strontium variation and the oxygen isotope water temperature record in the otoliths of the deep water fishes Trachyrincus murrayi and Coryphaenoides mediterraneus . (springer.com)
Despite the growing interest in directed Hydrogen Isotope Exchange (HIE) reactions, the existing synthetic protocols mainly rely on noble metals and the choice of the deuterium source remains unclear. (iciq.org)
Water4
However, the dramatic nature of the H/D isotope effect causes changes in both the physical and chemical properties of binary mixtures or water and water-miscible organic solvents. (hindawi.com)
Understanding how the behavior in the THF-water and other hydrate systems is affected by isotope substitution is critical to developing a complete understanding of their stability. (hindawi.com)
12 ] previously measured the isotope effect on cooling curves in the THF-water system, where substitution with D 2 O shifts the curve to higher temperatures. (hindawi.com)
The study is " Deuterium-enriched water ties planet-forming disks to comets and protostars " and it's published in the journal Nature. (universetoday.com)
Although deuterium, like all isotopes, has nearly identical chemical reactions to the non-isotopic hydrogen, the extra mass retards chemical reaction rate s. (everything2.com)
Deuterium has been the focus of pharmaceutical research for some years, because it can ensure that drugs are broken down 5, 10 or even 50 times more slowly. (uni-bonn.de)
Energy1
If you replace hydrogen with deuterium, the activation energy usually increases somewhat," says Gansäuer. (uni-bonn.de)