Isotope LabelingIsotopesNitrogen IsotopesOxygen IsotopesCarbon IsotopesBody WeightZinc IsotopesOrgan SizeSulfur IsotopesWeight LossWeight GainDeuteriumIron IsotopesBirth WeightMolecular WeightStrontium IsotopesCardiomegalyRadioisotope Dilution TechniqueMass SpectrometryIndicator Dilution TechniquesPulmonary EdemaKineticsFetal WeightLungMyocardiumTime FactorsGas Chromatography-Mass SpectrometryMercury IsotopesLiverRats, Sprague-DawleyPregnancyDeuterium OxideDisease Models, AnimalEvolution, PlanetaryLung InjuryRadioisotopesHydrogenHypertrophy, Left Ventricular