the membrane phospholipids ( estimated as the polar lipid fatty acids , the lipid phosphate , and phosopholipid glycerol phosphate ) , lipopolysaccharide lipid a ( estimated as the lps hydroxy fatty acids ) , cell walls ( estimated as the muramic acid ) , and adenosine triphosphate all give essentially identical estimates of cell numbers and dry weight as the direct counts , using conversion factors determined on subsurface microorganism monocultures .
C0023767
lipid a
C0023810
lps