| Effect of Cu and Ni on Growth,Mineral Uptake,Photosynthesis and Enzyme Activities of Chlorella vulgaris at different pH Values |
| P.K.RAI[1] NirupamaMALLICK[2] 等 |
| 关键词：Cu Ni pH值 小球藻 生长 矿物吸收 光合作用 金属毒性 水污染 |
| 主要内容：A pH dependent reduction in growth,pigment,ATP content,O2 evolution,carbon fixation,photosynthetic electron transport system,nutrient uptake(No3^- and NH4^+) nitrate reductase,and ATPase activities and increase in K^+-efflux of Chlorella vulgaris was noticed following supplementation of Cu and Ni to the culture medium.PSⅡ was found to be more sensitive to both pH and metals than PS I.Though.nitrate reductase(NR)was more sensitive to both pH and metals,the ATP ase was however,more sensitive to metals but less sensitive to acidic pH.Acid pH was found to inhibit the nutrinent(NO3^-and NH4^+) uptake and nitrate reductase in a non-competitive manner.The inhibition produced by the test metals alone was of non-competitive type for NO3^- uptake,nitrate reductase and ATPase and competitive for NH4^+ uptake.Acidity not only inhibited the metabolic variables directly but also through facilitated uptake of metals and increased membrane permeability.A very low sensitivity of ATPase to acidic pH seems to be responsible for the survival of algae in acid environment. |
| 《生物医学与环境科学：英文版》 1994,7(1).-56-67 |
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