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  • 1
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    Carbonate dissolution during subduction revealed by diamond-bearing rocks from the Alps (2011)
    Springer Nature
    Details
    Publication Date: 2011-10-01
    Description: Carbonate dissolution during subduction revealed by diamond-bearing rocks from the Alps Nature Geoscience 4, 703 (2011). doi:10.1038/ngeo1246 Authors: M. L. Frezzotti, J. Selverstone, Z. D. Sharp & R. Compagnoni Subduction zones modulate the global carbon cycle. Carbon is transported into the mantle by the subducting slab and returned to the surface by degassing at arc volcanoes above the subduction zone. However, the mechanisms for the transfer of carbon from the subducting slab and sediments into the overlying mantle wedge are poorly understood. Decarbonation—a metamorphic reaction between silicate and carbonate minerals that releases CO2—was thought to be the primary mechanism. Yet, thermodynamic models show that decarbonation occurs at much greater pressures and temperatures than those found in typical subduction zones. Carbon should therefore be retained in the slab and transported to great depths in the mantle, rather than supply the arc volcanoes. Here we identify diamonds in ultrahigh-pressure rocks from the Italian western Alps that have an oceanic origin. We assess the geochemistry of diamond-bearing fluid inclusions and find that they contain bicarbonate, carbonate and sulphate ions, silica monomers, and crystals of carbonate and silicate. This fluid geochemistry indicates that carbon was released from the slab at relatively shallow depths through dissolution, not decarbonation. We conclude that dissolution, driven by fluids released from the subducted slab, is an important mechanism for the transfer of carbon into the mantle and ultimately back into the atmosphere, helping to balance the carbon flux.
    Print ISSN: 1752-0894
    Electronic ISSN: 1752-0908
    Topics: Geosciences
    Published by Springer Nature
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  • 2
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    Association of BRCA1 with the hRad50-hMre11-p95 complex and the DNA damage response (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: BRCA1 encodes a tumor suppressor that is mutated in familial breast and ovarian cancers. Here, it is shown that BRCA1 interacts in vitro and in vivo with hRad50, which forms a complex with hMre11 and p95/nibrin. Upon irradiation, BRCA1 was detected in discrete foci in the nucleus, which colocalize with hRad50. Formation of irradiation-induced foci positive for BRCA1, hRad50, hMre11, or p95 was dramatically reduced in HCC/1937 breast cancer cells carrying a homozygous mutation in BRCA1 but was restored by transfection of wild-type BRCA1. Ectopic expression of wild-type, but not mutated, BRCA1 in these cells rendered them less sensitive to the DNA damage agent, methyl methanesulfonate. These data suggest that BRCA1 is important for the cellular responses to DNA damage that are mediated by the hRad50-hMre11-p95 complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhong, Q -- Chen, C F -- Li, S -- Chen, Y -- Wang, C C -- Xiao, J -- Chen, P L -- Sharp, Z D -- Lee, W H -- CA 30195/CA/NCI NIH HHS/ -- CA 58183/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):747-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Medicine, Institute of Biotechnology, University of Texas Health Science Center at San Antonio, 15355 Lambda Drive, San Antonio, TX 78245, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426999" target="_blank"〉PubMed〈/a〉
    Keywords: BRCA1 Protein/*metabolism ; Cell Cycle Proteins/*metabolism ; Cell Nucleus/*metabolism ; Cell Survival ; *DNA Damage ; *DNA Repair Enzymes ; DNA-Binding Proteins/*metabolism ; Gamma Rays ; Genes, BRCA1 ; Humans ; Methyl Methanesulfonate/pharmacology ; Mutagens/pharmacology ; Mutation ; *Nuclear Proteins ; Rad51 Recombinase ; Recombination, Genetic ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Rapamycin fed late in life extends lifespan in genetically heterogeneous mice (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-07-10
    Description: Inhibition of the TOR signalling pathway by genetic or pharmacological intervention extends lifespan in invertebrates, including yeast, nematodes and fruitflies; however, whether inhibition of mTOR signalling can extend lifespan in a mammalian species was unknown. Here we report that rapamycin, an inhibitor of the mTOR pathway, extends median and maximal lifespan of both male and female mice when fed beginning at 600 days of age. On the basis of age at 90% mortality, rapamycin led to an increase of 14% for females and 9% for males. The effect was seen at three independent test sites in genetically heterogeneous mice, chosen to avoid genotype-specific effects on disease susceptibility. Disease patterns of rapamycin-treated mice did not differ from those of control mice. In a separate study, rapamycin fed to mice beginning at 270 days of age also increased survival in both males and females, based on an interim analysis conducted near the median survival point. Rapamycin may extend lifespan by postponing death from cancer, by retarding mechanisms of ageing, or both. To our knowledge, these are the first results to demonstrate a role for mTOR signalling in the regulation of mammalian lifespan, as well as pharmacological extension of lifespan in both genders. These findings have implications for further development of interventions targeting mTOR for the treatment and prevention of age-related diseases.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2786175/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2786175/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harrison, David E -- Strong, Randy -- Sharp, Zelton Dave -- Nelson, James F -- Astle, Clinton M -- Flurkey, Kevin -- Nadon, Nancy L -- Wilkinson, J Erby -- Frenkel, Krystyna -- Carter, Christy S -- Pahor, Marco -- Javors, Martin A -- Fernandez, Elizabeth -- Miller, Richard A -- AG022303/AG/NIA NIH HHS/ -- AG022307/AG/NIA NIH HHS/ -- AG022308/AG/NIA NIH HHS/ -- AG025707/AG/NIA NIH HHS/ -- AG13319/AG/NIA NIH HHS/ -- P30 AG013319/AG/NIA NIH HHS/ -- P30 AG013319-119002/AG/NIA NIH HHS/ -- P30 AG013319-129002/AG/NIA NIH HHS/ -- P30 AG013319-139002/AG/NIA NIH HHS/ -- P30 AG013319-149002/AG/NIA NIH HHS/ -- P30 AG025707/AG/NIA NIH HHS/ -- U01 AG022303/AG/NIA NIH HHS/ -- U01 AG022307/AG/NIA NIH HHS/ -- U01 AG022307-01/AG/NIA NIH HHS/ -- U01 AG022307-02/AG/NIA NIH HHS/ -- U01 AG022307-03/AG/NIA NIH HHS/ -- U01 AG022307-04/AG/NIA NIH HHS/ -- U01 AG022307-05/AG/NIA NIH HHS/ -- U01 AG022307-05S1/AG/NIA NIH HHS/ -- U01 AG022308/AG/NIA NIH HHS/ -- England -- Nature. 2009 Jul 16;460(7253):392-5. doi: 10.1038/nature08221. Epub 2009 Jul 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Jackson Laboratory, Bar Harbor, Maine 04609, USA. david.harrison@jax.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19587680" target="_blank"〉PubMed〈/a〉
    Keywords: Administration, Oral ; Aging/*drug effects/genetics/*physiology ; Animals ; Carrier Proteins/antagonists & inhibitors/metabolism ; Diet ; Disease Susceptibility ; Female ; Longevity/*drug effects/*genetics/physiology ; Male ; Mice ; Phosphotransferases (Alcohol Group Acceptor)/antagonists & inhibitors/metabolism ; Sirolimus/*administration & dosage/*pharmacology ; Specific Pathogen-Free Organisms ; Survival Analysis ; TOR Serine-Threonine Kinases ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Upper-mantle volatile chemistry at Oldoinyo Lengai volcano and the origin of carbonatites (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-05-09
    Description: Carbonatite lavas are highly unusual in that they contain almost no SiO(2) and are 〉50 per cent carbonate minerals. Although carbonatite magmatism has occurred throughout Earth's history, Oldoinyo Lengai, in Tanzania, is the only currently active volcano producing these exotic rocks. Here we show that volcanic gases captured during an eruptive episode at Oldoinyo Lengai are indistinguishable from those emitted along mid-ocean ridges, despite the fact that Oldoinyo Lengai carbonatites occur in a setting far removed from oceanic spreading centres. In contrast to lithophile trace elements, which are highly fractionated by the immiscible phase separation that produces these carbonatites, volatiles (CO(2), He, N(2) and Ar) are little affected by this process. Our results demonstrate that a globally homogenous reservoir exists in the upper mantle and supplies volatiles to both mid-ocean ridges and continental rifts. This argues against an unusually C-rich mantle being responsible for the genesis of Na-rich carbonatite and its nephelinite source magma at Oldoinyo Lengai. Rather, these carbonatites are formed in the shallow crust by immiscibility from silicate magmas (nephelinite), and are stable under eruption conditions as a result of their high Na contents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, T P -- Burnard, P -- Marty, B -- Hilton, D R -- Furi, E -- Palhol, F -- Sharp, Z D -- Mangasini, F -- England -- Nature. 2009 May 7;459(7243):77-80. doi: 10.1038/nature07977.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, MSC03 2040, 1 University of New Mexico, New Mexico 87131-0001, USA. fischer@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19424154" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Subduction and recycling of nitrogen along the Central American margin (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-08-17
    Description: We report N and He isotopic and relative abundance characteristics of volatiles emitted from two segments of the Central American volcanic arc. In Guatemala, delta15N values are positive (i.e., greater than air) and N2/He ratios are high (up to 25,000). In contrast, Costa Rican N2/He ratios are low (maximum 1483) and delta15N values are negative (minimum -3.0 per mil). The results identify shallow hemipelagic sediments, subducted into the Guatemalan mantle, as the transport medium for the heavy N. Mass balance arguments indicate that the subducted N is efficiently cycled to the atmosphere by arc volcanism. Therefore, the subduction zone acts as a "barrier" to input of sedimentary N to the deeper mantle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, Tobias P -- Hilton, David R -- Zimmer, Mindy M -- Shaw, Alison M -- Sharp, Zachary D -- Walker, James A -- New York, N.Y. -- Science. 2002 Aug 16;297(5584):1154-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA. fischer@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12183622" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Terrestrial water fluxes dominated by transpiration (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-04-05
    Description: Renewable fresh water over continents has input from precipitation and losses to the atmosphere through evaporation and transpiration. Global-scale estimates of transpiration from climate models are poorly constrained owing to large uncertainties in stomatal conductance and the lack of catchment-scale measurements required for model calibration, resulting in a range of predictions spanning 20 to 65 per cent of total terrestrial evapotranspiration (14,000 to 41,000 km(3) per year) (refs 1, 2, 3, 4, 5). Here we use the distinct isotope effects of transpiration and evaporation to show that transpiration is by far the largest water flux from Earth's continents, representing 80 to 90 per cent of terrestrial evapotranspiration. On the basis of our analysis of a global data set of large lakes and rivers, we conclude that transpiration recycles 62,000 +/- 8,000 km(3) of water per year to the atmosphere, using half of all solar energy absorbed by land surfaces in the process. We also calculate CO2 uptake by terrestrial vegetation by connecting transpiration losses to carbon assimilation using water-use efficiency ratios of plants, and show the global gross primary productivity to be 129 +/- 32 gigatonnes of carbon per year, which agrees, within the uncertainty, with previous estimates. The dominance of transpiration water fluxes in continental evapotranspiration suggests that, from the point of view of water resource forecasting, climate model development should prioritize improvements in simulations of biological fluxes rather than physical (evaporation) fluxes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jasechko, Scott -- Sharp, Zachary D -- Gibson, John J -- Birks, S Jean -- Yi, Yi -- Fawcett, Peter J -- England -- Nature. 2013 Apr 18;496(7445):347-50. doi: 10.1038/nature11983. Epub 2013 Apr 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA. jasechko@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23552893" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Carbon Dioxide/analysis/metabolism ; Ecosystem ; Fresh Water/*analysis/chemistry ; Lakes ; Oceans and Seas ; Photosynthesis ; Plant Transpiration/*physiology ; Plants/*metabolism ; Rain ; Rivers ; Uncertainty ; Volatilization ; *Water Movements
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 7
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    Jasechko et al. reply (2014)
    Nature Publishing Group (NPG)
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    Publication Date: 2014-02-14
    Description: replying to A. M. J. Coenders-Gerrits et al. 506, http://dx.doi.org/10.1038/nature12925 (2014)In their Comment, Coenders-Gerrits et al. suggest that our conclusion that transpiration dominates the terrestrial water cycle is biased by unrepresentative input data and optimistic uncertainty ranges related to runoff, interception and the isotopic compositions of transpired and evaporated moisture. We clearly presented the uncertainties applied in our Monte-Carlo sensitivity analysis, we reported percentile ranges of results rather than standard deviations to best communicate the nonlinear nature of the isotopic evaporation model, and we highlighted that the uncertainty in our calculation remains large, particularly in humid catchments (for example, figure 2 in our paper).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jasechko, Scott -- Sharp, Zachary D -- Gibson, John J -- Birks, S Jean -- Yi, Yi -- Fawcett, Peter J -- England -- Nature. 2014 Feb 13;506(7487):E2-3. doi: 10.1038/nature12926.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA. ; 1] Alberta Innovates-Technology Futures, Vancouver Island Technology Park, Victoria, British Columbia V8Z 7X8, Canada [2] Department of Geography, University of Victoria, Victoria, British Columbia V8W 3R4, Canada. ; 1] Alberta Innovates-Technology Futures, Vancouver Island Technology Park, Victoria, British Columbia V8Z 7X8, Canada [2] Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24522604" target="_blank"〉PubMed〈/a〉
    Keywords: Fresh Water/*analysis ; Plant Transpiration/*physiology ; Plants/*metabolism ; *Water Movements
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    The chlorine isotope composition of the moon and implications for an anhydrous mantle (2010)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2010-08-07
    Description: Arguably, the most striking geochemical distinction between Earth and the Moon has been the virtual lack of water (hydrogen) in the latter. This conclusion was recently challenged on the basis of geochemical data from lunar materials that suggest that the Moon's water content might be far higher than previously believed. We measured the chlorine isotope composition of Apollo basalts and glasses and found that the range of isotopic values [from -1 to +24 per mil (per thousand) versus standard mean ocean chloride] is 25 times the range for Earth. The huge isotopic spread is explained by volatilization of metal halides during basalt eruption--a process that could only occur if the Moon had hydrogen concentrations lower than those of Earth by a factor of approximately 10(4) to 10(5), implying that the lunar interior is essentially anhydrous.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sharp, Z D -- Shearer, C K -- McKeegan, K D -- Barnes, J D -- Wang, Y Q -- New York, N.Y. -- Science. 2010 Aug 27;329(5995):1050-3. doi: 10.1126/science.1192606. Epub 2010 Aug 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87122, USA. zsharp@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20688980" target="_blank"〉PubMed〈/a〉
    Keywords: Chlorides/analysis ; Chlorine/*analysis ; Extraterrestrial Environment ; Glass/chemistry ; Hydrogen/*analysis ; Isotopes/analysis ; Metals ; *Moon ; Silicates/chemistry ; Volatilization ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Unique meteorite from early Amazonian Mars: water-rich basaltic breccia Northwest Africa 7034 (2013)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2013-01-05
    Description: We report data on the martian meteorite Northwest Africa (NWA) 7034, which shares some petrologic and geochemical characteristics with known martian meteorites of the SNC (i.e., shergottite, nakhlite, and chassignite) group, but also has some unique characteristics that would exclude it from that group. NWA 7034 is a geochemically enriched crustal rock compositionally similar to basalts and average martian crust measured by recent Rover and Orbiter missions. It formed 2.089 +/- 0.081 billion years ago, during the early Amazonian epoch in Mars' geologic history. NWA 7034 has an order of magnitude more indigenous water than most SNC meteorites, with up to 6000 parts per million extraterrestrial H(2)O released during stepped heating. It also has bulk oxygen isotope values of Delta(17)O = 0.58 +/- 0.05 per mil and a heat-released water oxygen isotope average value of Delta(17)O = 0.330 +/- 0.011 per mil, suggesting the existence of multiple oxygen reservoirs on Mars.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agee, Carl B -- Wilson, Nicole V -- McCubbin, Francis M -- Ziegler, Karen -- Polyak, Victor J -- Sharp, Zachary D -- Asmerom, Yemane -- Nunn, Morgan H -- Shaheen, Robina -- Thiemens, Mark H -- Steele, Andrew -- Fogel, Marilyn L -- Bowden, Roxane -- Glamoclija, Mihaela -- Zhang, Zhisheng -- Elardo, Stephen M -- New York, N.Y. -- Science. 2013 Feb 15;339(6121):780-5. doi: 10.1126/science.1228858. Epub 2013 Jan 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, USA. agee@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23287721" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/analysis ; Crystallization ; Iron/analysis ; Manganese/analysis ; *Mars ; *Meteoroids ; North America ; Oxygen Isotopes/analysis ; Radiometric Dating ; Water/analysis/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Chlorine Isotope Geochemistry (2017)
    Mineralogical Society of America
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    Publication Date: 2017-02-01
    Print ISSN: 1529-6466
    Electronic ISSN: 1943-2666
    Topics: Geosciences
    Published by Mineralogical Society of America
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