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  • Isotopes
  • The degree of mass fractionation of Xe isotopes relative to the modern atmosphere can provide a time stamp for dating Archean kerogens and therefore narrowing the time window for the diversification of early life during the Archean eon. (sciencemag.org)
  • Approach
  • The enrichment approach was combined with solid-phase chemical derivatization and isotopic labeling to detect O-GlcNAc modification sites and to compare site-specific O-GlcNAc occupancy levels between normal and diabetic erythrocyte proteins. (diabetesjournals.org)
  • Liquid
  • Hiserodt RD, Swijter DFH, Mussinan CJ (2000) Identification of atranorin and related potential allergens in oak moss absolute by high-performance liquid chromatography-tandem mass spectrometry using negative ion atmospheric pressure chemical ionization. (springer.com)
  • Fractionation of each of the four sediment samples was performed by separating compounds according to their polarity, planarity, and the size of the aromatic ring system in an on-line fractionation procedure on coupled high performance liquid chromatography columns. (usask.ca)
  • A method combining liquid/liquid extraction and chromatographic fractionation has been developed for the preparation of pure monophenyltin (MPhT), diphenyltin (DPhT), and triphenyltin (TPhT), synthesized from isotope-enriched Sn metal using phenylation of SnI(4) in diethylether (DEE) followed by quenching with HBr and water. (diva-portal.org)
  • atmospheric
  • Xe trapped in barite and in fluid inclusions in hydrothermal quartz of Archean ages present Xe isotopic ratios intermediate between modern atmospheric Xe and planetary precursors, showing that atmospheric evolution as a result of mass-dependent fractionation (MDF) was a protracted process still ongoing during the Archean eon [see the study of Avice et al . (sciencemag.org)
  • effects
  • 2 However, over the past 50 years an increasing body of evidence has accumulated indicating that several environmental chemicals exist that also have oestrogenic and/or potentially antioestrogenic effects both on aquatic and land based wildlife, and on humans. (bmj.com)
  • combination
  • Developments in immunoaffinity depletion and various fractionation approaches in combination with substantial improvements in LC-MS platforms have enabled the plasma proteome to be profiled with considerably greater dynamic range of coverage, allowing many proteins at low ng/ml levels to be confidently identified. (mcponline.org)
  • present
  • At present, more than 120 chemical species have been detected in the interstellar space, primarily in giant gas clouds scattered throughout our Galaxy. (arizona.edu)
  • study
  • In this study, a sequential Sr fractionation scheme was developed for wheat flour matrix. (springer.com)
  • A large number of SOM fractionation procedures have been developed to distinguish between SOM to study whether it is liable or recalcitrant to activities of soil microbes. (oalib.com)
  • products
  • A wide variety of products are made in the chemical and pharmaceutical manufacturing industries, that require large volumes of chemicals, materials, and substances that are used throughout process operations. (environmental-expert.com)
  • The access to clean, safe drinking water is seen as a fundamental human right and yet industrial-scale human activities in catchments can pollute water systems with toxic products/chemicals and compromise water quality and quantity, as well as adversely affect the ecosystems of catchments. (sourcewatch.org)
  • Studies showed that the properties of fractionated end products can be affected by fractionation processing conditions. (peerj.com)
  • initial
  • The chemical potential gradients caused by the initial assemblage appear at the far end of the melt column because that is the finite boundary condition for the diffusive supply of ions to the crystallization front. (arizonageologicalsoc.org)