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The morphological , microstructural , mechanical , and chemical changes are evaluated in crosB-sectioned powder particles and compared to isolated control samples to understand the mechanisms of degradation .
 concept or principle: microstructural; application: mechanical; material: powder particles; concept or principle: samples; concept or principle: degradation
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: microstructural, mechanical, powder particles, samples, degradation 
Answer:
 concept or principle: microstructural; application: mechanical; material: powder particles; concept or principle: samples; concept or principle: degradation