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...sulfide]]s, have been studied and interpreted as records of the changing [[sulfur cycle]] throughout the earth's history. ...s">{{cite journal| vauthors = Canfield DE |title=Biogeochemistry of Sulfur Isotopes|journal=[[Reviews in Mineralogy and Geochemistry]]|date=2001|volume=43|issu ...

...rm of metabolism is [[anaerobic oxidation of methane]] (AOM). The presence of AOM marks the transition from [[dissimilatory sulfate reduction]] to [[meth ...low concentrations of sulfate and methane because the anaerobic oxidation of methane consumes both molecules.<ref name="Bhatnagar 2008">{{Cite journal|l ...

{{Short description|Atoms of different elements with the same number of nucleons}} ...y stable nuclides shown in black; disconnected 'islands' are a consequence of the [[Mattauch isobar rule]].]] ...

...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% ...g others in ecology, demonstrate the utility of stable isotopes as tracers of environmental processes that are difficult to measure directly. ...

...sulfur isotope composition, it provides a valuable record of the global [[sulfur cycle]] across time and space. == Importance of sulfur (and CAS) to biogeochemistry == ...

...= J. | title = Cost-effective density functional theory (DFT) calculations of equilibrium isotopic fractionation in large organic molecules | journal = P ...13" /><ref name="liu2021">{{cite journal | title = Theoretical calculation of position-specific carbon and hydrogen isotope equilibriums in butane isomer ...

...f hydrogen]] with [[chalcogen]] atoms (elements of group 16: [[oxygen]], [[sulfur]], [[selenium]], [[tellurium]], [[polonium]], and [[livermorium]]). [[Water ...]]-poor environments and as such is one chemical responsible for the smell of [[flatulence]]. It is also a [[volcanic gas]]. Despite its toxicity, the [[ ...

{{Short description|Method of geochemical research}} ...h's history of formation and [[Planetary differentiation|differentiation]] of the solid Earth into layers. ...

...ctrometry)|characteristics of the sample itself]]. By measuring a material of known isotopic composition, fractionation within the [[Mass spectrometry|ma ...materials are seldom reported. This article aggregates the δ and R values of common and non-traditional stable isotope reference materials. ...

| workplaces = [[University of Rochester]]<br>[[Harvard University]] | alma_mater = [[Washington State University]]<br>[[University of Colombo]] ...

{{short description|Ratio of a slightly volatile element, potassium (K), to a highly refractory element, ...U ratio helps explain the evolution of the planetary system and the origin of Earth's moon. ...

...nanoscale maps of elemental or isotopic distribution, parallel acquisition of up to seven masses, [[isotope|isotopic identification]], high mass resoluti [[File:NanoSIMS50 instrument diagram.png|thumb|Simplified diagram of a NanoSims50 instrument.]] ...

{{Short description|Chemical compound of the form –O–MoO₂–O–}} [[Image:Molybdate.png|thumb|150px|Structure of molybdate]] ...

...st, but this article focuses on those that are stable. Isotopic variations of trace metals in samples are used as [[Isotopic signature|isotopic fingerpri ...(Δ; the difference between two δ values). For a more complete description of these notations, see the isotope notation section in [[Hydrogen isotope bio ...

...h by the biological activity of marine organisms and by the natural forces of the Sun and tides and movements within the Earth's crust, these are the mar ...the [[saline water|saltwater]] of seas or oceans or the [[brackish]] water of coastal [[Estuary|estuaries]]. These biogeochemical cycles are the pathways ...

...t4=Boullis |first4=Bernard |title=Recycling the Actinides, The Cornerstone of Any Sustainable Nuclear Fuel Cycles |journal=Procedia Chemistry |date=2012 ...=Vienna |isbn=978-92-0-108417-0 |edition=2018}}</ref> At the back-end step of the [[nuclear fuel cycle]], two spent fuel management options could be pote ...

{{Short description|Presence of methane on Mars}} [[File:Martian Methane Map.jpg|thumb|260px|The source of Mars methane is unknown; its detection is shown here.]] ...

...g protons to an energy of over 1&nbsp;[[TeV]] (tera electron volts). Beams of protons and antiprotons, circulating in opposite directions in the rear rin ...tion 16frames 1.6sec.gif|thumb|upright=2.2|Animation showing the operation of a [[linear particle accelerator|linear accelerator]], widely used in both p ...

{{Short description|Field of scientific study}} ...(general concept)|climate change]] over the millions to billions of years of the [[geologic time scale]]. ...

{{Short description|Spectroscopic technique based on change of nuclear spin state}} ...ld not be confused with solid state NMR, which aims at removing the effect of the same couplings by [[Magic Angle Spinning]] techniques. ...