15570
NMRD profiles showed a strong relaxivity enhancement ( increase of 432 % in the r1 value at 20 MHz ) when the paramagnetic complex was grafted at the nanoparticle surface , because of a reduction of its mobility .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None