▁al umn i ▁Category : Year ▁of ▁birth ▁missing ▁( l iving ▁people ) <0x0A> </s> ▁Bac ill us ▁( Lat in ▁" st ick ") ▁is ▁a ▁genus ▁of ▁Gram - pos itive , ▁rod - sh aped ▁b acter ia , ▁a ▁member ▁of ▁the ▁ph yl um ▁F irm ic utes , ▁with ▁ 2 6 6 ▁named ▁species . ▁The ▁term ▁is ▁also ▁used ▁to ▁describe ▁the ▁shape ▁( rod ) ▁of ▁certain ▁b acter ia ; ▁and ▁the ▁pl ural ▁Bac illi ▁is ▁the ▁name ▁of ▁the ▁class ▁of ▁b acter ia ▁to ▁which ▁this ▁genus ▁belongs . ▁ ▁Bac ill us ▁species ▁can ▁be ▁either ▁oblig ate ▁aer ob es : ▁o xygen ▁dependent ; ▁ ▁or ▁fac ult ative ▁an a er ob es : ▁having ▁the ▁ability ▁to ▁be ▁an a er ob ic ▁in ▁the ▁absence ▁of ▁o xygen . ▁Cult ured ▁Bac ill us ▁species ▁test ▁positive ▁for ▁the ▁en zym e ▁catal ase ▁if ▁o xygen ▁has ▁been ▁used ▁or ▁is ▁present . ▁ ▁Bac ill us ▁can ▁reduce ▁themselves ▁to ▁o val ▁end os por es ▁and ▁can ▁remain ▁in ▁this ▁d orm ant ▁state ▁for ▁years . ▁The ▁end osp ore ▁of ▁one ▁species ▁from ▁Mor oc co ▁is ▁reported ▁to ▁have ▁surv ived ▁being ▁he ated ▁to ▁ 4 2 0   ° C . ▁▁ ▁End osp ore ▁formation ▁is ▁usually ▁triggered ▁by ▁a ▁lack ▁of ▁nut ri ents : ▁the ▁b acter ium ▁div ides ▁within ▁its