Walker, David J F
Adhikari, Ramesh Y
Holmes, Dawn E
Ward, Joy E
Woodard, Trevor L
Nevin, Kelly P
Lovley, Derek R
Article History
Received: 17 March 2017
Revised: 17 June 2017
Accepted: 25 July 2017
First Online: 5 September 2017
Competing interests
: The authors declare no conflict of interest.