GasesPositron-Emission TomographyOtoacoustic Emissions, SpontaneousKiller Cells, NaturalTomography, Emission-ComputedChromatography, GasGas Chromatography-Mass SpectrometryVehicle EmissionsFluorodeoxyglucose F18RadiopharmaceuticalsTomography, Emission-Computed, Single-PhotonPulmonary Gas ExchangeGas, NaturalNoble GasesGreenhouse EffectBlood Gas AnalysisGas PoisoningFluorine RadioisotopesSpectrometry, FluorescenceMethaneCarbon FootprintCarbon DioxideAir PollutantsFossil FuelsVolatilizationAtmosphereEnvironmental MonitoringBiological ProductsPentanesVolatile Organic CompoundsMultimodal ImagingTomography, X-Ray ComputedBrainTime FactorsGas GangreneNitrous OxideGasolineCarbon RadioisotopesConservation of Natural ResourcesOil and Gas FieldsMolecular Sequence DataFluorescent DyesSensitivity and SpecificityOxygenFluorescencePower PlantsCoalDenitrificationMagnetic Resonance ImagingSpectrometry, X-Ray EmissionLuminescenceModels, TheoreticalCerebrovascular CirculationLuminescent MeasurementsReproducibility of ResultsEnergy-Generating ResourcesEcosystemManureAir PollutionTemperatureCarbonConservation of Energy ResourcesSoilMolecular StructureModels, BiologicalNatural Language ProcessingKineticsImage Processing, Computer-AssistedNatural Killer T-CellsMustard GasHydrocarbonsOrganotechnetium CompoundsGlobal WarmingPhotonsCochleaAgricultureNitrogen RadioisotopesHeliumHemiterpenesIncinerationAirParticulate MatterWaterNitrogenThallium RadioisotopesAmino Acid SequenceRadioactive TracersCytotoxicity, ImmunologicNatural HistoryAir Pollutants, OccupationalSelection, GeneticOximesDiagnostic ImagingRacloprideDeoxyglucoseCopper RadioisotopesHydrogen-Ion ConcentrationRadioisotopesAlgorithmsFertilizers