Rachlin J W, Grosso A
Department of Biological Sciences, Lehman College of the City University of New York, Bronx 10468-1589.
Arch Environ Contam Toxicol. 1991 May;20(4):505-8. doi: 10.1007/BF01065839.
The effects of pH alone, and in combination with exposure to 0.89 microM cadmium, on the growth response of the green alga Chlorella vulgaris were evaluated. Acidic (3.0-6.2) and alkaline (8.3-9.0) pH values retarded the growth of this alga. Optimal growth occurred when the pH of the medium was adjusted to values of 7.5 and 8.0. When the cells were exposed to pH adjusted medium plus the presence of 0.89 microM Cd, a value known to reduce population growth by 50% at the control pH of 6.9, the affects were additive at the acidic (3.0-5.0) pH ranges. At alkaline pH values of 8.3-9.0 all toxicity responses could be explained by pH adjustment alone, indicating that additional cadmium toxicity was absent. At pH values of 7.5 and 8.0, cadmium toxicity was mitigated against, and resultant growth at pH 8.0 was at the same enhanced rate as this pH without cadmium.
研究了单独的pH值以及与暴露于0.89微摩尔镉共同作用对普通小球藻生长反应的影响。酸性（3.0 - 6.2）和碱性（8.3 - 9.0）pH值会抑制这种藻类的生长。当培养基的pH值调整为7.5和8.0时，藻类生长最佳。当细胞暴露于pH值调整后的培养基且存在0.89微摩尔镉（已知在对照pH值6.9时会使种群增长减少50%）时，在酸性（3.0 - 5.0）pH范围内，影响是相加的。在碱性pH值8.3 - 9.0时，所有毒性反应仅通过pH值调整即可解释，表明不存在额外的镉毒性。在pH值7.5和8.0时，镉毒性得到缓解，在pH值8.0时的生长速率与无镉时该pH值下的生长速率相同且有所提高。
