SulfurSulfur CompoundsSulfur DioxideSulfur IsotopesAmino Acids, SulfurPositron-Emission TomographyMustard GasOtoacoustic Emissions, SpontaneousSulfidesSulfur OxidesThiosulfatesTomography, Emission-ComputedVehicle EmissionsFluorodeoxyglucose F18RadiopharmaceuticalsSulfatesChlorobiTomography, Emission-Computed, Single-PhotonAir PollutantsOxidoreductases Acting on Sulfur Group DonorsSulfur HexafluorideChromatiaceaeChemical Warfare AgentsSulfurtransferasesSulfur AcidsGreenhouse EffectFluorine RadioisotopesCysteineSpectrometry, FluorescenceAtmosphereOxidation-ReductionHydrogen SulfideChlorobiumMethionineAir PollutionMethaneEnvironmental MonitoringChromatiumCarbon FootprintSulfitesVolatilizationSulfonium CompoundsAcidithiobacillusSpectrometry, X-Ray EmissionCysteine SynthaseFossil FuelsCarbonGasolineMultimodal ImagingMolecular Sequence DataSulfur-Reducing BacteriaGasesNitrogenIron-Sulfur ProteinsTomography, X-Ray ComputedCarbon RadioisotopesSulfhydryl CompoundsCoalThiosulfate SulfurtransferaseHydrogensulfite ReductasePentanesDenitrificationBrainThiobacillusSulfur Group TransferasesPower PlantsSpectrum AnalysisCarbon DioxideEnergy-Generating ResourcesFluorescenceFluorescent DyesVolatile Organic CompoundsSeawaterThiotrichaceaeCystineEpsilonproteobacteriaSulfate AdenylyltransferaseCystathionine gamma-LyaseParticulate MatterGammaproteobacteriaNitrous OxideGeologic SedimentsAcidianusKineticsBacteriaPhylogenyRNA, Ribosomal, 16SLuminescent MeasurementsSelenium CompoundsIronTechnetiumSensitivity and SpecificityLuminescenceTime FactorsPhototrophic ProcessesOxidoreductasesVolcanic EruptionsLyasesCerebrovascular CirculationAnaerobiosis