“…Sulphate-reducing bacteria like Desulfovibrio desulfuricans and Desulfovibrio vulgaris; nitrate-reducing bacteria like Pseudomonas stutzeri , and others. (Heselmeyer et al, 1991; Gauri et al, 1992; Ranalli et al, 2000, 2003, 2005; Cappitelli et al, 2005, 2007; Polo et al, 2010; Alfano et al, 2011; Gioventù et al, 2011; Bosch-Roig et al, 2012, 2013a,b; Troiano et al, 2013). …”