15856
Our results indicate that varying the ligand length has a direct effect on the colloidal arrangement of the system in a magnetic field , producing differences in the rate and size of chain formation , and hence systematic changes in transverse relaxation rates over time .
 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