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Submitted on: 11 August 2014.
Revised on: 08 October 2014.
Accepted on: 05 December 2014.
___________________AIMS Microbiology---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 04 June 2015.
Revised on: 23 August 2015.
Accepted on: 10 September 2015.
___________________AIMS Microbiology---AMER INST MATHEMATICAL SCIENCES-AIMS