title: Quantitation of the lecithin-sphingomyelin ratio in amniotic fluid by a simple charring method.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis* / Q000378:metabolism; D002855:Chromatography, Thin Layer; D003720:Densitometry; D005314:Embryonic and Fetal Development; D005260:Female; D005782:Gels; D008168:Lung / Q000196:embryology; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis* / Q000378:metabolism; D011247:Pregnancy; D012822:Silicon Dioxide; D013109:Sphingomyelins / Q000032:analysis* / Q000378:metabolism; D013464:Sulfuric Acids
chemical_list: D005782:Gels; D010713:Phosphatidylcholines; D013109:Sphingomyelins; D013464:Sulfuric Acids; D012822:Silicon Dioxide