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  • seawater
  • Micro-crystalline barites recovered by deep-sea drilling from Site 684 on the Peru margin and Site 799 in the Japan Sea are highly enriched in the heavy sulfur isotope relative to seawater ( d34S up to +84? (pangaea.de)
  • To determine when this atmospheric build-up began, Paytan says that researchers have focused their attention on sulfates -- sulfur-based compounds that are a common ingredient in seawater today. (stanford.edu)
  • These microbes act like tiny chemical factories, consuming sulfate and converting it into another form of sulfur that eventually turns into fool's gold after chemically bonding with iron dissolved in seawater. (stanford.edu)
  • Molybdenum isotopes of these 8 sapropels encompass a range of values (d98Mo = +0.2 to +1.7), but are all 98Mo-depleted relative to seawater (d98Mo = +2.3 per mil), suggesting that quantitative removal of Mo did not occur. (pangaea.de)
  • Seawater sulfate may have dominated sulfur contributions from this source. (geoscienceworld.org)
  • chlorine
  • Researchers from Michigan State University and the RIKEN Nishina Center in Japan discovered eight new rare isotopes of the elements phosphorus, sulfur, chlorine, argon, potassium, scandium and, most importantly, calcium. (phys.org)
  • Two of the other new isotopes of sulfur and chlorine, S-49 and Cl-52, were not predicted to exist by a number of models that paint a lower resolution picture of nuclei. (phys.org)
  • 36Cl happens in trace quantities in mother nature like a cosmogenic nuclide inside a ratio of about (seven-ten) × 10−thirteen to 1 with secure chlorine isotopes: it is produced while in the atmosphere by spallation of 36Ar by interactions with cosmic ray protons. (blogolize.com)
  • geochemical
  • Geochemical redox proxies (Re, Mo, Mo isotopes, V, Fe/Al, and multiple S isotopes) in 8 sapropels from the Pleistocene confirm water column euxinic conditions of varying intensity during sapropel deposition. (pangaea.de)
  • These studies were selected to highlight the versatility of this analytical method to paleontological research and are complemented by a discussion of new techniques and instrumentation in stable isotope analysis (e.g., laser ablation and compound-specific isotope ratio mass spectrometry, and calcium and clumped isotopes), which represent the latest advances in the extension of these geochemical tools to the paleontology of fossil mammals. (mammalsociety.org)
  • In contrast, syngenetic pyrite formed within a euxinic water column typically is enriched in As, Mo and Sb, but is low in heavy metals, and the geochemical variation reflects changes in sea water composition. (wiley.com)
  • radioactive
  • If it is impossible to isolate chemically a radioactive isotope from an element of which it is part, it must be possible to use this peculiarity to follow in its details the behaviour of this element during chemical reactions and physical processes of different kinds. (nobelprize.org)
  • The situation was to be very different when Frédéric and Irène Joliot-Curie , and Fermi succeeded in producing radioactive isotopes from any element by bombarding it with particles. (nobelprize.org)
  • The most interesting short-lived isotopes synthesized during a recent experiment at RIKEN's Radioactive Isotope Beam Factory (RIBF) were calcium-59 and calcium-60, which are now the most neutron -laden calcium isotopes known to science. (phys.org)
  • Radioactive isotopes ranging from 11 O to 26 O have also been characterized, all short-lived. (wikipedia.org)
  • Opportunities have arisen recently to consider the use of stable isotope analysis in understanding the migration of wild birds and their involvement in the spread of Highly Pathogenic Avian Influenza, and these safe, non-radioactive isotopes may even be of use in diagnosis of disease or in typing pathogenic organisms. (springer.com)
  • lighter
  • But Paytan points to a recent study by D.E. Canfield and a team of researchers from Odense University in Denmark demonstrating that, at high temperatures, certain populations of sulfate-consuming bacteria show a distinct preference for lighter isotopes. (stanford.edu)
  • The humification of both dead moss and larch needles leads to retain the fraction where Zn bound most strongly thus releasing the lighter isotopes in solution and preserving the heavy isotopes in the humification products, in general accord with previous experimental and modeling works [GCA 75:7632-7643, (springeropen.com)
  • ratio
  • But when scientists analyze samples of fool's gold that are billions of years old, they often find that the ratio of Sulfur 32 to Sulfur 34 is too low to have been produced by marine bacteria. (stanford.edu)
  • fossil
  • Stable isotope analysis of fossil materials has become an increasingly important method for gathering dietary and environmental information from extinct species in terrestrial and aquatic ecosystems. (mammalsociety.org)
  • After a brief introduction to issues associated with the preservation of stable isotopic information in soft and mineralized tissues, a series of case studies involving the application of stable isotope analysis to fossil mammal research is discussed. (mammalsociety.org)
  • Based on fossil carotenoids, anoxygenic green (Chlorobiacea) and purple sulfur bacteria (Chromatiaceae) also contributed to photosynthate. (pnas.org)
  • Acid rain is caused when high sulphur fossil fuels are burnt," says Dr Mihai Borsaru, a nuclear physicist at CSIRO Exploration and Mining. (innovations-report.com)
  • compounds
  • In fact the method could be applied only in the case of heavy metals - lead, thorium, bismuth and thallium - and their compounds. (nobelprize.org)
  • calcium
  • Researchers from Michigan State University and the RIKEN Nishina Center in Japan have discovered eight new rare isotopes, including the heaviest known calcium atom, calcium-60. (phys.org)
  • The calcium isotopes are indicated from the last stable calcium-48 out to calcium isotopes that can only be reached with FRIB. (phys.org)
  • In the resulting debris of the collision, with a minuscule chance, a rare isotope such as calcium-60 is formed. (phys.org)
  • In the future, the Facility for Rare Isotope Beams (FRIB) at Michigan State University will allow scientists might be able to make calcium-68 or even calcium-70, which may be the heaviest calcium isotopes . (phys.org)
  • sediments
  • 1996): Barite fronts in continental margin sediments: A new look at barium remobilization in the zone of sulfate reduction and formation of heavy barites in diagenetic fronts. (pangaea.de)
  • Multiple S isotope data from this sapropel suggest that the redox interface where oxidative sulfur cycling occurred was present in the sediments during hemipelagic sedimentation, but moved into the water column during sapropel deposition. (pangaea.de)
  • Surprisingly, the heaviest d98Mo values are found within hemipelagic sediments. (pangaea.de)
  • Diagenetic pyrite formed within anoxic sediments generally has a high heavy metals content, and the degree of pyritization of these elements increases with increasing oxygen deficiency, similar to the degree of pyritization of reactive Fe. (wiley.com)
  • sensitivity
  • Previous spectrometer devices lacked the sensitivity to detect this heavy isotope in the atmosphere. (thefreedictionary.com)
  • These isotopic techniques that included the use of 75 Se, 32 P, 125 I, and 35 S isotopes enabled a level of sensitivity and specificity that was hitherto unrealized, and it is prescient to remind ourselves of just how successful these technologies were, in spite of their infrequent use nowadays. (springer.com)
  • scientists
  • Tarasov explained that proving the existence of a certain isotope of an element can advance scientists' understanding of the nuclear force. (phys.org)
  • Scientists expect that the portable borehole logging instrument, one of CSIRO s SIROLOG suite of products, will be used to measure sulphur in mine waste rock and in coal. (innovations-report.com)
  • atomic
  • Einsteinium's atomic number is 99 but Es has 19 known isotopes. (answers.com)
  • An atomic mass of 16 was assigned to oxygen prior to the definition of the unified atomic mass unit based upon 12 C. Since physicists referred to 16 O only, while chemists meant the naturally-abundant mixture of isotopes, this led to slightly different mass scales between the two disciplines. (wikipedia.org)
  • acid
  • Acetylmercaptoacetic acid (CAS NO.1190-93-8) will emit toxic sulfur oxide fumes by heat. (lookchem.com)
  • The sulphur oxidises and combines with water to form sulphuric acid, which, in high volumes, wreaks havoc on the environment. (innovations-report.com)
  • analysis
  • Finally, the review looks at the potential for stable isotope analysis for a variety of applications-in the tracking of animal migrations, where the migrant are potential carriers of transboundary animal diseases, and where it would be useful to determine the origins of the carrier, e.g. (springer.com)
  • researchers
  • To find out, researchers are focusing their attention on fool's gold the shiny mineral that gleams like gold but actually is made of ordinary iron and sulfur. (stanford.edu)
  • To synthesize these new isotopes, researchers accelerated an intense beam of heavy zinc particles onto a block of beryllium. (phys.org)
  • Pleistocene
  • A study was made of the heavy minerals from the glacial and interglacial deposits of Pleistocene age exposed in the Don Valley, Toronto, Ontario. (geoscienceworld.org)
  • productivity
  • Heavy metal exposure affect plant productivity by interfering, directly and indirectly, with photosynthetic reactions. (biomedcentral.com)
  • Heavy metals affect plant productivity by interfering with photosynthesis in all aspects of this process and there is a large body of evidence indicating that there is a direct effect of heavy metals on the photochemical reactions. (biomedcentral.com)
  • source
  • Long-term degassing of basalt magma may have been an important ultimate source of reduced sulfur to the dacite. (usgs.gov)
  • life
  • This life is thought to consist of small prokaryote cells with a penchant for sulphur instead of oxygen. (blogspot.com)
  • The longest-lived radioisotope is 15 O with a half-life of 122.24 seconds , while the shortest-lived isotope is 12 O with a half-life of 580(30)×10 −24 seconds (the half-life of the unbound 11 O was not measured). (wikipedia.org)