7881
We demonstrate aqueous phase biosynthesis of phase - pure metallic copper nanoparticles ( CuNPs ) using a silver resistant bacterium Morganella morganii .
 Chemical: copper; Chemical: silver
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: copper; Chemical: silver