487
Using laser diffraction , BET nitrogen adsorption , scanning electron microscopy imaging , and a microhydrodynamic analysis of milling , this study , for the first time , provides sufficient evidence for the existence of the Rehbinder effect during the milling of drugs .
 Chemical: nitrogen
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: nitrogen 
Answer:
 Chemical: nitrogen