Synthesis and detection of oxygen-18 labeled phosphate. [PDF]
PLoS ONE, 2011 Phosphorus (P) has only one stable isotope and therefore tracking P dynamics in ecosystems and inferring sources of P loading to water bodies have been difficult.
Eric S Melby +2 more
doaj +5 more sources
Production and stability of Oxygen-18 labeled Caribbean ciguatoxins and gambierones. [PDF]
Toxicon, 2022 Ciguatoxins (CTXs) and gambierones are ladder-shaped polyethers associated with ciguatera poisoning and Gambierdiscus spp. Several of these compounds contain carbonyl or hemiketal groups, which have the potential to exchange with 18O-labeled water under acidic conditions.
Mudge EM +5 more
europepmc +4 more sources
Unraveling the Photocatalytic Mechanisms on TiO2 Surfaces Using the Oxygen-18 Isotopic Label Technique [PDF]
Molecules, 2014 During the last several decades TiO2 photocatalytic oxidation using the molecular oxygen in air has emerged as a promising method for the degradation of recalcitrant organic pollutants and selective transformations of valuable organic chemicals.
Xibin Pang +5 more
doaj +2 more sources
Acid-catalyzed oxygen-18 labeling of peptides. [PDF]
Anal Chem, 2009 In enzymatic (18)O-labeling strategies for quantitative proteomics, the exchange of carboxyl oxygens at low pH is a common, undesired side reaction. We asked if acid-catalyzed back exchange could interfere with quantitation and whether the reaction itself could be used as method for introducing (18)O label into peptides. Several synthetic peptides were
Niles R +5 more
europepmc +4 more sources
Trypsin-catalyzed oxygen-18 labeling for quantitative proteomics. [PDF]
Methods Mol Biol, 2011 Stable isotope labeling based on relative peptide/protein abundance measurements is commonly applied for quantitative proteomics. Recently, trypsin-catalyzed oxygen-18 labeling has grown in popularity due to its simplicity, cost-effectiveness, and its ability to universally label peptides with high sample recovery.
Qian WJ +3 more
europepmc +4 more sources
18Oxygen Substituted Nucleosides Combined with Proton Beam Therapy: Therapeutic Transmutation In Vitro [PDF]
International Journal of Particle Therapy, 2021 Purpose: Proton therapy precisely delivers radiation to cancers to cause damaging strand breaks to cellular DNA, kill malignant cells, and stop tumor growth.
Tyvin Rich, MD +9 more
doaj +1 more source
Oxygen-18 Exchange Reactions of Aldehydes and Ketones [PDF]
Journal of the American Chemical Society, 1966 Using infra-red spectroscopy, the equilibrium exchange times have been determined for a series of ketones, aromatic aldehydes, and {beta}-ketoesters reacting with oxygen 18 enriched water. These exchange times have been evaluated in terms of steric and electronic considerations, and applied to a discussion of the exchange times of chlorophylls a and b ...
Byrn, Marianne, Calvin, Melvin
openaire +4 more sources
Factors controlling stable isotope composition of precipitation in arid conditions: an observation network in the Tianshan Mountains, central Asia [PDF]
Tellus: Series B, Chemical and Physical Meteorology, 2016 Approximately one-third of the Earth's arid areas are distributed across central Asia. The stable isotope composition of precipitation in this region is affected by its aridity, therefore subject to high evaporation and low precipitation amount.
Shengjie Wang +6 more
doaj +1 more source
Isotopic composition of Danube water in the pre-delta section from the years 2009 - 2012 [PDF]
Scientific Annals of the Danube Delta Institute, 2013 The isotopic composition of river water in the Danube Basin is mainly governed by the isotopic composition of precipitation in the catchment area, evaporation effects play only a minor role. Short-term and long-term isotope signals from precipitation are
RANK Dieter +5 more
doaj +1 more source
Hydrochemical and isotopic characterization of a complex aquifer system
Acque Sotterranee, 2023 A methodology was developed and applied to the Tindouf basin (south-western Algeria) to understand the hydrogeology of a complex aquifer system with a limited number of data, to identify the favorable areas for the design and building of new wells, and ...
Faycal Toumi +5 more
doaj +1 more source