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vi ) Novel alloying systems capable of enhancing the mechanical and biological performance of porous metallic implants are in great demand , together with new post-treatment technologies for improving the bioactivity and biocompatibility .
 engineering feature: alloying; application: mechanical; concept or principle: performance; application: porous metallic implants; manufacturing process: post-treatment; machanical property: bioactivity; machanical property: biocompatibility
Please list all entity words in the text that fit the category.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} 
Answer:
 engineering feature: alloying; application: mechanical; concept or principle: performance; application: porous metallic implants; manufacturing process: post-treatment; machanical property: bioactivity; machanical property: biocompatibility