title: III.1.a General introduction.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D008163:Luminescent Measurements; D009602:Nitrosamines / Q000032:analysis*; D010782:Photolysis; D010947:Plants, Toxic; D013329:Structure-Activity Relationship; D014026:Nicotiana / Q000032:analysis
chemical_list: D009602:Nitrosamines