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Advanced electron microscopy techniques including electron backscatter diffraction and transmission electron microscopy were used to identify the mechanism of interface formation .
 process characterization: electron microscopy; process characterization: electron backscatter diffraction; process characterization: transmission electron microscopy; concept or principle: mechanism; concept or principle: interface
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: electron microscopy, electron backscatter diffraction, transmission electron microscopy, mechanism, interface 
Answer:
 process characterization: electron microscopy; process characterization: electron backscatter diffraction; process characterization: transmission electron microscopy; concept or principle: mechanism; concept or principle: interface