19737
The decreased level of cell toxicity for small AgNPs was 32 +/- 0 . 7 % , whereas it was only 10 . 6 +/- 5 . 2 % for large AgNPs kept 24h under light irradiation .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None