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In addition , the usefulness of using quantum dots as a proxy for other nanometals ( no acute toxicity , clear visualization in electron microscopy ) , in conjunction with several different imaging techniques in assessing uptake and accumulation of nanoparticles in daphnids was demonstrated .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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