▁available ▁in ▁culture ▁collections . ▁Standard ▁bio chem ical ▁evaluation ▁pan els ▁are ▁lack ing ▁Ph y to b acter ▁s pp . ▁from ▁their ▁database , ▁thus ▁leading ▁to ▁mis ident ifications ▁with ▁other ▁Enter ob acter ales ▁species . ▁B acter ia ▁belonging ▁to ▁this ▁genus ▁are ▁not ▁p ig ment ed , ▁are ▁chem o organ ot roph ic ▁and ▁able ▁to ▁fix ▁nit ro gen . ▁They ▁are ▁la ct ose ▁fer ment ing , ▁cy to chrome - ox id ase ▁negative ▁and ▁catal ase ▁positive . ▁Gl uc ose ▁is ▁fer ment ed ▁with ▁the ▁production ▁of ▁gas . ▁Col on ies ▁growing ▁on ▁Mac Con key ▁ag ar ▁( MA C ) ▁are ▁circular , ▁convex ▁and ▁smooth ▁with ▁non - ent ire ▁marg ins ▁and ▁a ▁usually ▁elev ated ▁center . ▁Two ▁species ▁are ▁currently ▁included ▁in ▁Ph y to b acter . ▁ ▁Species ▁ ▁Ph y to b acter ▁dia z ot roph icus ▁is ▁the ▁most ▁common ▁Ph y to b acter ▁species ▁recovered ▁from ▁the ▁environment ▁and ▁humans ▁and ▁is ▁an ▁opportun istic ▁path ogen ▁associated ▁with ▁cont amin ated ▁c ath eters ▁or ▁the ▁use ▁of ▁total ▁parent eral ▁nut r ition . ▁ ▁Ph y to b acter ▁urs ing ii . ▁ ▁References ▁▁ ▁Category : B acter ia ▁gener a <0x0A> </s> ▁Pan ason ic ▁T ough pad ▁is ▁a ▁series ▁of ▁table t ▁computers ▁developed ▁and ▁designed ▁by ▁Pan ason ic ▁as ▁a ▁subset ▁of ▁its