50ppm

1

Higher concentration of CuCl_2 ( 50ppm ) could destroy the memberane system of chloroplasts . The number of stacks of grana was reduced and the arrangement of grana was also irregular under above-mentioned conditions .

较高浓度的氯化铜溶液（50ppm）处理可破坏叶绿体的膜系统，使叶绿体基粒垛迭减少，排列不规则。
2

The effect of root growing was better when using NAA ( 150ppm ), and IBA ( 50ppm , 100ppm ), and the rate of growing root were 75 % , 69 % and 71 % respectively .

150mg/L的萘乙酸和50mg/L、100mg/L的吲哚丁酸处理催根效果较好，插条生根率分别为75%、69%和71%。
3

Trace Cl ~ - ( 50ppm ) has a slight inhibition effect on the anodic dissolution of the material because of its adsorption on the surface , but corrosion rate increases when the concentration of Cl ~ - increases to 200 ppm .

结果表明，微量Cl~-（50ppm）的吸附对316L的活性溶解有抑制作用。Cl~-浓度再高则腐蚀速度增大。