The change of ammonia nitrogen concn . in the waterbody had no significant difference from that of the control group.
对于水体中氨氮的浓度，罗非鱼的影响则不明显。
2
The inhibin plasmid DNA was extracted and purified by alkaline lysis method and DEAE-fiber column chromatography and its concn.
采用碱裂解法与DEAE -纤维柱层析法提取与纯化抑制素质粒dna，用分光光度法测定其浓度和纯度。
3
Effects of acidity, concn. of potassium iodide and dosage of reducing agent on determination are investigated. It is simple and rapid with relative standard deviation 1.08%.