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In this study , we compared their toxicity in vivo and in vitro based on the physicochemical properties of three different types of TiO ( 2 ) nanowires , H ( 2 ) Ti ( 3 ) O ( 7 ) nanowires ( 1HTO ) , hydrothermal treatment ( 2HTO ) , and calcination ( 3HTO ) of 1HTO .
 Chemical: TiO ( 2 ); Chemical: H ( 2 ) Ti ( 3 ) O ( 7 )
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: TiO ( 2 ); Chemical: H ( 2 ) Ti ( 3 ) O ( 7 )