BetainePulmonary SurfactantsSurface-Active AgentsPulmonary Surfactant-Associated Protein APulmonary Surfactant-Associated ProteinsSurface TensionLipotropic AgentsProteolipidsPulmonary Surfactant-Associated Protein DPulmonary Surfactant-Associated Protein BSarcosineCholinePulmonary Surfactant-Associated Protein CBetaine-Homocysteine S-Methyltransferase1,2-DipalmitoylphosphatidylcholineRespiratory Distress Syndrome, NewbornPulmonary AlveoliOsmotic PressureLungWater-Electrolyte BalanceBiological ProductsPhosphatidylglycerolsCetrimonium CompoundsPhospholipidsMicellesOsmolar ConcentrationProlinePhosphatidylcholinesSodium ChlorideBronchoalveolar Lavage FluidAdsorptionSurface PropertiesFatty AlcoholsHomocysteinePolysorbatesLung ComplianceEmulsionsMethionineHomocystinuriaAirWaterBronchoalveolar LavageAmino Acids, DiaminoQuaternary Ammonium CompoundsPneumocytesPhosphorylcholine