Loading...
*  Isotopes of chromium - Wikipedia
The isotopes of chromium range from 42Cr to 67Cr. The primary decay mode before the most abundant stable isotope, 52Cr, is ... ISBN 978-0-8493-0485-9. Chromium isotopes data from The Berkeley Laboratory Isotopes Project's. ... Naturally occurring chromium (24Cr) is composed of four stable isotopes; 50Cr, 52Cr, 53Cr, and 54Cr with 52Cr being the most ... Chromium isotopic contents are typically combined with manganese isotopic contents and have found application in isotope ...
https://en.wikipedia.org/wiki/Isotopes_of_chromium
*  GSA Today - The case for a Neoproterozoic Oxygenation Event: Geochemical evidence and biological consequences
Chromium Isotopes. This new method may be the only one capable of tracing increases in atmospheric oxygen, because chromium ... comm.). (H) Key aspects of the Precambrian history of hexavalent chromium in sea water. Increasing Cr isotope fractionation (δ ... Sulfur Isotopes. Sulfur isotope discrimination (marine sulfate δ34S − pyrite sulfide δ34S) increased to modern values during ... Carbon Isotopes. The carbon isotope record provides insight into the Neoproterozoic global carbon cycle. Since the pioneering ...
http://geosociety.org/gsatoday/archive/21/3/article/i1052-5173-21-3-4.htm
*  Discovery Metadata Dataset:The oxygen fugacity of core segregation and the redox evolution of the mantle: constraints from iron...
Implications for fractionation during core formation Unlocking the zinc isotope systematics of iron meteorites Iron isotope ... Four papers are linked to this grant: Stable chromium isotopic composition of meteorites and metal-silicate experiments: ... CHROMIUM ISOTOPES EARTH CORE EARTH MANTLE IRON METEORITES ISOTOPES METEORITES OXIDATION PERIDOTITE PEROVSKITE PYROXENITE ... The oxygen fugacity of core segregation and the redox evolution of the mantle: constraints from iron and chromium isotopes ( ...
http://www.bgs.ac.uk/discoverymetadata/13606881.html
*  Find BGS datasets by browsing an A to Z list of keywords
Chromium (11). Chromium isotopes (1). Clay minerals (1). Climate change (14). Climatology (14) ...
https://www.bgs.ac.uk/discoverymetadata/keywords.html
*  KAKEN - Research Projects | Generation and migration dynamics of geofluids (KAKENHI-PLANNED-21109006)
Journal Article] Contributors to chromium isotope variation of meteorites2010. *. Author(s). Qin, L., Alexander, C.M.O'D., ... Journal Article] Osmium isotope anomalies in chondrites : Results for acid residues and related leachates2010. *. Author(s). ... Presentation] U-series isotope disequilibrium in subduction zone volcanic rocks. *. Author(s). Yokoyama, T. ... Journal Article] Comparison of stable isotopes, ratios of 36Cl/Cl and 129I/127I in brine and deep groundwater from the Pacific ...
https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-21109006/
*  Proterozoic oxygen rise linked to shifting balance between seafloor and terrestrial weathering | PNAS
2009) Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes. Nature 461(7261):250-253. ... 1992) Carbon isotope evidence for the stepwise oxidation of the Proterozoic environment. Nature 359(6396):605-609. ... An alternative isotope model incorporates seafloor weathering as a carbon removal pathway (28) and produces similar forg ... S6), our predicted forg fits the isotope model (8) more closely. However, the present work is primarily concerned with the ...
https://www.pnas.org/content/111/25/9073
*  Table of Contents - March 18, 2011, 331 (6023) | Science
The different chromium isotopic compositions of chondrites and the mantle offer insight into Earth's early history. ...
http://science.sciencemag.org/content/331/6023
*  Cyanobacteria - Simple English Wikipedia, the free encyclopedia
Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes. Nature 461 (7261): 250-253. Abstract: [1] ...
https://simple.wikipedia.org/wiki/Cyanobacteria
*  Table of Contents - October 23, 2018, 115 (43) | PNAS
Volatile loss following cooling and accretion of the Moon revealed by chromium isotopes Paolo A. Sossi, Frédéric Moynier, and ...
https://www.pnas.org/content/115/43
*  Marine Drugs | Free Full-Text | Plastids of Marine Phytoplankton Produce Bioactive Pigments and Lipids | HTML
Fluctuations in precambrian atmospheric oxygenation recorded by chromium isotopes. Nature 2009, 461, 250-253. [Google Scholar ... A Stable-Isotope Mass Spectrometry-Based Metabolic Footprinting Approach to Analyze Exudates from Phytoplankton ... Bano, F.; Zutshi, S.; Fatma, T. Chromium (VI) induced oxidative stress in Hapalosiphon fontinalis. World J. Microbiol. ... elevated levels of β-carotene and Asta were observed in the cyanobacteria Hapalosiphon fontinalis in response to chromium (VI ...
http://www.mdpi.com/1660-3397/11/9/3425/htm
*  Publications
Chromium isotope fractionation in ferruginous sediments.. - Geochimica et Cosmochimica Acta. , 223. , pp. 198-215. .. DOI: http ...
https://www.gfz-potsdam.de/en/section/geomicrobiology/publications/
*  A popular tool to trace Earth's oxygen history can give false positives | EurekAlert! Science News
If it was a chromium isotope system reading that caused the enthusiasm, it might need to be curbed. ... "On a global level, the chromium isotope system is still a great indicator of atmospheric oxygen levels through the ages," Tang ... IMAGE: It's relatively simple to take a chromium isotope reading on a rock sample. First, crush the sample. Second, dissolve ... Today, researchers test deep rock layer samples for the relation between two chromium isotopes, 52Cr, by far the most common Cr ...
https://www.eurekalert.org/pub_releases/2017-11/giot-apt111417.php
*  The rise and fall of oxygen
The researchers noted the distribution of chromium isotopes and redox-sensitive metals in these soils. Chromium isotopes are ... Studies of sulphur isotope relations allow researchers to make inferences about whether there was an ozone layer in the early ... sensitive to reactions involving oxygen, with the heavier isotope being slightly more soluble when oxidised than the lighter ...
http://theconversation.com/the-rise-and-fall-of-oxygen-18954
*  Great Oxygenation Event - Wikipedia
"Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes". Nature. 461 (7261): 250-253. Bibcode: ... Chromium is not easily dissolved and its release from rocks would have required the presence of a powerful acid. One such acid ... Besides marine cyanobacteria, there is also evidence of cyanobacteria on land.[citation needed] A spike in chromium contained ... This change from MIF to MDF of sulfur isotopes also may have been caused by an increase in glacial weathering, or the ...
https://en.wikipedia.org/wiki/Great_Oxygenation_Event
*  Index to Publication Data
Schauble EA, Rossman GR, Taylor HP Jr (2002) Theoretical estimates of equilibrium chromium-isotope fractionations. Geochimica ... Schauble EA, Rossman GR, Taylor HP (2004) Theoretical estimates of equilibrium chromium-isotope fractionations. Chemical ... Ma C, Beckett JR, Rossman GR (2010) Discovery of a new chromium sulfide mineral, Cr5S6 in Murchinson. 73rd Annual Meteoritical ... Chemtob SM, Rossman GR, Young ED, Ziegler K, Eiler JM, Hurowitz JA (2013) Si isotope systematics of acidic alteration of fresh ...
http://minerals.gps.caltech.edu/Manuscripts/Index.html
*  A Popular Tool to Trace Earth's Oxygen History Can Give False Positives | Elixir Of Knowledge
The chromium isotope system tends to work thus followed by how organic ligands tend to make for false positives - The Earth, a ... Chromium Isotope System - Great Indicator of Atmospheric Oxygen Levels. Yuanzhi Tang, co-leading the study commented that they ... Tang had commented that on a global level, the chromium isotope system is yet a great indicator of atmospheric oxygen levels ... Presently researchers tend to test deep rock layer samples for the link between two chromium isotopes, 53Cr, by far the most ...
https://www.elixirofknowledge.com/2018/01/a-popular-tool-to-trace-earths-oxygen.html
*  Wasservorkommen im Universum - Wikipedia
Neutron-rich chromium isotope anomalies in supernova nanoparticles. In: The Astrophysical Journal. Nr. 720, 2010, S. 1577. doi: ... The hydroxyl content and hydrogen isotope composition of lunar apatites. In: 43rd Lunar and Planetary Science Conference. 2012 ...
https://de.m.wikipedia.org/wiki/Wasservorkommen_im_Universum
*  Chromium - Wikipedia
Isotopes[edit]. Main article: Isotopes of chromium. Naturally occurring chromium is composed of three stable isotopes; 52Cr, 53 ... A large number of chromium(III) compounds are known, such as chromium(III) nitrate, chromium(III) acetate, and chromium(III) ... "Chromium". Retrieved 24 Aug 2008.. *^ a b c Dennis, JK; Such, TE (1993). "History of Chromium Plating". Nickel and Chromium ... with manganese isotopes. This circumstance is useful in isotope geology. Manganese-chromium isotope ratios reinforce the ...
https://en.wikipedia.org/wiki/Chromium
*  Researchers discover heaviest known calcium atom; eight new rare isotopes discovered in total
Researchers from Michigan State University and the RIKEN Nishina Center in Japan discovered eight new rare isotopes of the ... which may be the heaviest calcium isotopes. Explore further: ISOLDE mints isotopes of chromium ... ISOLDE mints isotopes of chromium. July 6, 2018 CERN's nuclear physics facility, ISOLDE, has minted a new coin in its ... The facility has forged neutron-rich isotopes of the element chromium for the first time, and in prodigious quantities. ... ...
https://phys.org/news/2018-07-heaviest-calcium-atom-rare-isotopes.html
*  Chromium: The mineralogy of Chromium
Main isotopes of Chromium. Isotope. % in Nature. Half Life. Decay type. Decay product. ... Most widespread minerals containing Chromium. This list of minerals containing Chromium is built from the mindat.org locality ... Element association of Chromium in the Mineral World. This table compares the known valid mineral species listed listed with ... chromium (III) nitrate nonahydrate. [Cr(H2O)6](NO3)3 · 3H2O. +3. ...
https://www.mindat.org/element/Chromium
*  Chromium - New World Encyclopedia
Chromium compounds of oxidation state +6 are powerful oxidants.. Isotopes. The isotopes of chromium range in atomic weight from ... Chromium metal and chromium(III) compounds are not usually considered health hazards, but hexavalent chromium (chromium VI) ... Chromium(III) oxide. Chromium(III) oxide (Cr2O3) also known as chromium sesquioxide or chromia, is one of four oxides of ... The human body needs trace amounts of trivalent chromium (chromium(III)) for sugar metabolism, but hexavalent chromium ( ...
http://www.newworldencyclopedia.org/entry/Chromium
*  moynier | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS
Mass-independent isotope fractionation in the chemical exchange reaction of chromium (III) using a crown ether. Journal of ... Mougel, B. Moynier, F. Gopel, C., Koeberl, C. Chromium isotope evidence in impact ejecta for the nature of the impactors of the ... Foriel, J., Moynier, F., Shultz, T., Koeberl, C. Chromium isotope anomaly in an El'gygytgyn crater impactite: Evidence for a ... In situ analysis of non-traditional isotopes by SIMS and LA-MC-ICP-MS: key aspects and the example of Mg isotopes in olivines ...
http://www.ipgp.fr/fr/moynier-frederic
*  PSRD: Fossil Meteorite Unearthed From Crater
Their laboratory analyses show that the meteorite has chondritic chromium isotope ratios and identical platinum-group element ... pyroxene) and chromium (up to 0.35% Cr2O3 in the orthopyroxene, and 0.69% in clinopyroxene). Third, and unique to Morokweng's ... This melt sheet has high abundances of chromium, nickel, cobalt, and the platinum-group elements. The age of the crater was ...
http://www.psrd.hawaii.edu/June06/Morokweng.html
*  A case for low atmospheric oxygen levels during Earth's middle history | Emerging Topics in Life Sciences
Chromium isotopes have emerged in recent years as an alternative window to ancient pO2 (e.g. [4,26-29]). This system is ... 2016) The chromium isotope composition of reducing and oxic marine sediments. Geochim. Cosmochim. Acta 184, 1-19 doi:10.1016/j. ... 2018) Chromium isotope fractionation induced by ligand-promoted mobilization of a Cr(III)-containing mineral. Nat. Commun. 1590 ... 2009) Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes. Nature 461, 250-253 doi:10.1038/ ...
http://www.emergtoplifesci.org/content/2/2/149