28977
FTIR measurements showed that supramolecular aggregation proceeded without the formation of beta - aggregated structures and AFM images revealed the presence of oligomers and amorphous aggregates ; no fibrillar structures were observed .
 None
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