Nearly half of these are capable of methanogenesis, and all have their membrane lipids ether-linked.  Insensitive to chloramphenicol, streptomycin and kanamycin, their encasings do not contain muramic acid and they use methionine as their initiator tRNA, which together with the fact that their ribosomes are sensitive to diphtheria toxin, indicates close relationship with plants, animals, and fungi.  They were first discovered by Carl Woese and George Fox in 1977, and by 
Nearly half of these are capable of methanogenesis, and all have their membrane lipids ether-linked.  Insensitive to chloramphenicol, streptomycin and kanamycin, their encasings do not contain muramic acid and they use methionine as their initiator tRNA, which together with the fact that their ribosomes are sensitive to diphtheria toxin, indicates close relationship with plants, animals, and fungi.  They were first discovered by Carl Woese and George Fox in 1977, and by 2000 there were 209 catalogued species which are commonly placed in 3 broad categories of halophiles, (*) thermophiles, and acidophiles.  This is because many are found in extreme environments.  Though they sound old, they are in fact, FTP what domain of prokaryotic organisms closer related to Eukaryotes than bacteria are?
Nearly half of these are capable of methanogenesis, and all have their membrane lipids ether-linked.  
{Archaea} (accept {Archaebacteria})