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Thus , it can be concluded that heterogeneous nucleation is the primary mechanism by which inoculants can influence the microstructure in the present study .
 material: be; concept or principle: heterogeneous nucleation; concept or principle: mechanism; concept or principle: microstructure
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: be, heterogeneous nucleation, mechanism, microstructure 
Answer:
 material: be; concept or principle: heterogeneous nucleation; concept or principle: mechanism; concept or principle: microstructure