17889
The extent to which different forms of nanoparticles of titanium dioxide ( nano - TiO2 ) aggregated with microalgae , decreased food levels and hence impaired growth , reproduction and fitness of Daphnia magna individuals were studied .
 Chemical: titanium dioxide; Chemical: TiO2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: titanium dioxide; Chemical: TiO2