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- {{Short description|Methane molecules that contain two or more rare isotopes}} ...provides information independent from the traditional [[Δ13C|carbon]] or [[Isotopes of hydrogen|hydrogen isotope]] composition of methane molecules. ...35 KB (4,909 words) - 23:41, 24 June 2024
- ...erization of [[food chain]]s.<ref name=":9"/><ref>{{Cite book|title=Stable Isotopes in Ecological Research|last1=Fry|first1=B.|last2=Sherr|first2=E. B.|chapter ...ayes|first=John|date=2001-01-01|title=Fractionation of Carbon and Hydrogen Isotopes in Biosynthetic Processes|url=https://www.researchgate.net/publication/2462 ...36 KB (5,153 words) - 08:45, 7 February 2025
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- ...ratio = 0) and [[helium-3]] (''N''/''Z'' ratio = 0.5) are the only stable isotopes with neutron–proton ratio under one. [[Uranium-238]] has the highest ''N''/ ...alf-life.svg|right|thumb|Isotope half-lives. Note that the plot for stable isotopes diverges from the line {{nowrap|1=''Z'' = ''N''}} as the element number ''Z ...4 KB (576 words) - 13:51, 29 January 2024
- {{Short description|Measure of the ratio of stable isotopes nitrogen-15 and nitrogen-14}} ...tuart |date=27 March 2014 |title=Application of Nitrogen and Carbon Stable Isotopes (δ15N and δ13C) to Quantify Food Chain Length and Trophic Structure |journa ...5 KB (724 words) - 09:28, 19 November 2024
- ...al relationships|exponential relation]] that describes the partitioning of isotopes between two reservoirs as one reservoir decreases in size. The equations ca where R = ratio of the isotopes (e.g., <sup>18</sup>O/<sup>16</sup>O) in the reactant, R<sup>0</sup> = init ...3 KB (427 words) - 13:34, 24 August 2021
- '''Samarium-147''' ('''<sup>147</sup>Sm''' or '''Sm-147''') is an [[isotopes of samarium|isotope of samarium]], making up 15% of natural [[samarium]]. I * [[Isotopes of samarium]] ...5 KB (640 words) - 03:31, 31 January 2025
- ...sotope <math>i+1</math> at the rate <math>\lambda_i</math>, the amounts of isotopes in the ''k''-step decay chain evolves as: For example, for the simple case of a chain of three isotopes the corresponding Bateman equation reduces to ...4 KB (626 words) - 11:39, 27 December 2023
- ..., [[per mil]] or ''per mille'', using the ‰ symbol. Heavy and light sulfur isotopes [[fractionation|fractionate]] at different rates and the resulting δ<sup>34 ...s">{{cite journal| vauthors = Canfield DE |title=Biogeochemistry of Sulfur Isotopes|journal=[[Reviews in Mineralogy and Geochemistry]]|date=2001|volume=43|issu ...12 KB (1,694 words) - 23:28, 18 October 2024
- ...mic spectra are minute differences between the electronic energy levels of isotopes of the same element. They are the focus of a multitude of theoretical and e For two isotopes with atomic mass approximately <math>A' M_p</math> and <math>A'' M_p</math> ...11 KB (1,704 words) - 17:41, 3 December 2024
- ...t4=E.S. |last5=Rubatto |first5=D. |date=February 2019 |title=Radiogenic Ca isotopes confirm post-formation K depletion of lower crust |url=http://www.geochemic Potassium has three naturally occurring isotopes: stable {{chem|39|K}}, {{chem|41|K}} and [[radioactive]] {{chem| ...11 KB (1,554 words) - 21:30, 5 December 2023
- ...atures and concentrations separates into parts. The initial mix of the two isotopes spontaneously separates into <chem>^{4}He</chem>-rich and <chem>{}^3He</che ...7 KB (1,087 words) - 05:41, 21 May 2024
- ...ecent progress has enabled ab initio treatment of heavier nuclei such as [[isotopes of nickel|nickel]].<ref name=navratil2016>{{cite journal|first1=P.|last1=Na |title=Ab Initio Calculations of Even Oxygen Isotopes with Chiral Two-Plus-Three-Nucleon Interactions ...6 KB (780 words) - 14:55, 16 July 2022
- ...me=":0">{{cite journal | vauthors = Kleine T, Walker RJ | title = Tungsten Isotopes in Planets | journal = Annual Review of Earth and Planetary Sciences | volu ...y 114 days,<ref>{{NUBASE 2003}}</ref> such that the intermediate nuclide [[Isotopes of tantalum|tantalum-182]] (<sup>182</sup>Ta) can effectively be ignored. ...18 KB (2,464 words) - 06:59, 6 February 2025
- ...fer by the number of neutrons, and therefore the masses and volumes of two isotopes are different; these differences give rise to the [[isotopic shift]] on ato ...12 KB (1,888 words) - 05:36, 3 April 2024
- ...bar rule]] states that if two adjacent elements on the periodic table have isotopes of the same mass number, at least one of these isobars must be a [[radionuc ...6 KB (925 words) - 06:02, 17 February 2025
- ...st4=P. E. |date=1986-10-01 |title=Kinetic fractionation of stable nitrogen isotopes during amino acid transamination |url=https://dx.doi.org/10.1016/0016-7037% ...se application, among others in ecology, demonstrate the utility of stable isotopes as tracers of environmental processes that are difficult to measure directl ...23 KB (3,369 words) - 07:31, 3 November 2024
- ...ean]] relative isotopic mass of a (typical naturally occurring) mixture of isotopes. ...ommon isotopes.svg|thumb|right|300 px|Binding energy per nucleon of common isotopes. A graph of the ratio of mass number to atomic mass would be similar.]] ...22 KB (3,334 words) - 02:47, 9 January 2025
- ...=free|bibcode=2015JRRAS...8..155M }}</ref> The three different radioactive isotopes of uranium are uranium-238, [[uranium-235]], and [[uranium-234]]. Each has ...12 KB (1,783 words) - 12:54, 27 February 2025
- {{Short description|Methane molecules that contain two or more rare isotopes}} ...provides information independent from the traditional [[Δ13C|carbon]] or [[Isotopes of hydrogen|hydrogen isotope]] composition of methane molecules. ...35 KB (4,909 words) - 23:41, 24 June 2024
- ...on|The study of environmental processes using the relative abundance of Si isotopes}} ...nce of [[Silicon|Si]] [[isotope]]s. As the relative abundance of Si stable isotopes varies among different natural materials,<ref name=":6" /> the differences ...23 KB (3,173 words) - 00:03, 6 January 2024
- ...f nuclei and her role in the discovery of <sup>249</sup>No, the lightest [[Isotopes of nobelium|isotope of nobelium]]. She is a director of research for the [[ ...4 KB (493 words) - 17:22, 11 July 2024
- ...5998493}}</ref> and environmental scientists;<ref>{{Cite book|title=Stable Isotopes in Ecology and Environmental Science|date=2007-07-14|publisher=Blackwell Pu ...F/te_825_prn.pdf |title=Reference and intercomparison materials for stable isotopes of light elements |publisher=International Atomic Energy Agency |date=1995} ...15 KB (2,107 words) - 22:38, 3 February 2025