▁end osp ore - form ing ▁aer ob ic ▁or ▁fac ult atively ▁an a er ob ic , ▁Gram - pos itive ▁b acter ia ; ▁in ▁some ▁species ▁cult ures ▁may ▁turn ▁Gram - negative ▁with ▁age . ▁The ▁many ▁species ▁of ▁the ▁genus ▁exhib it ▁a ▁wide ▁range ▁of ▁phys i olog ic ▁ab ilities ▁that ▁allow ▁them ▁to ▁live ▁in ▁every ▁natural ▁environment . ▁Only ▁one ▁end osp ore ▁is ▁formed ▁per ▁cell . ▁The ▁sp ores ▁are ▁resist ant ▁to ▁heat , ▁cold , ▁radiation , ▁des ic cation , ▁and ▁dis in fect ants . ▁ ▁Origin ▁of ▁name ▁ ▁The ▁genus ▁Bac ill us ▁was ▁named ▁in ▁ 1 8 3 5 ▁by ▁Christian ▁Gott fried ▁Ehren berg , ▁to ▁contain ▁rod - sh aped ▁( b ac ill us ) ▁b acter ia . ▁He ▁had ▁seven ▁years ▁earlier ▁named ▁the ▁genus ▁B acter ium . ▁Bac ill us ▁was ▁later ▁am ended ▁by ▁Ferdinand ▁C ohn ▁to ▁further ▁describe ▁them ▁as ▁sp ore - form ing , ▁Gram - pos itive , ▁aer ob ic ▁or ▁fac ult atively ▁an a er ob ic ▁b acter ia . ▁Like ▁other ▁gener a ▁associated ▁with ▁the ▁early ▁history ▁of ▁micro bi ology , ▁such ▁as ▁Pseud omon as ▁and ▁V ib rio , ▁the ▁ 2 6 6 ▁species ▁of ▁Bac ill us ▁are ▁u bi quit ous . ▁The ▁genus ▁has ▁a ▁very ▁large ▁rib os om al ▁ 1 6 S ▁divers ity