4940
We studied the mechanism of aerobic inactivation of Desulfovibrio fructosovorans nickel - iron ( NiFe ) hydrogenase by quantitatively examining the results of electrochemistry , EPR and FTIR experiments .
 Chemical: nickel - iron; Chemical: NiFe
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: nickel - iron; Chemical: NiFe