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Results of 96 hr growth tests performed with Nitzschia palea (a), Gomphonema parvulum (b), Nostoc sp. (c), Komvophoron sp. (d) and Scenedesmus obliquus (e) exposed to PS50, PS350 and PS50-HA. The values are expressed as percentages of the respective control. Mean ± SE (n = 4), asterisks correspond to data significantly different from the corresponding control (*: p < 0.05); **: p < 0.01; ***: p < 0.001).
