? Ammonia and lower aliphatic amine in the air was collected by glass fiber filter film, which was pretreated by oxalic acid, and then analyzed by ion chromatography after the sample being extracted by ultrasonic process.

Cluster analysis of polybasic acids and higher fatty acids in flue-cured tobacco leaves in Yunnan and overseas;

Objective To analyze polybasic acids and higher fatty acids of Rosa roxburghii Tratt fruit.

The physiological activities of trace elements,low molecule organic acids,higher fatty acids and phenol compounds in liquor body of Wuliangye-- - Chinese Famous Liquor were illustrated in this paper.

Study on the use of acetic anhydride as a co reagent of fatty acid to synthesize cellulose esters.

Analysis of variation of the contents of non-volatile organic acids and senior fatty acids in different flue-cured tobacco genotypes;

The result indicates that:(1) There exists high heterosis for non-volatile organic acid,senior fatty acid and total content of organic acid.