Interestingly, the use of carboxylic acids showed an increasing trend over time at concentrations of 20 and 100 mg/L nZnO.
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The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities.
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The sentences
There was a decreasing trend in the detected AUC values at the same concentration on different sampling days, except for the 100 mg/L nZnO concentration, which showed a slight growth.