Lemon balm contains eugenol , tannins , and terpenes .  It also contains (+)-citronellal , 1-octen-3-ol , 10-α-cadinol , 3-octanol , 3-octanone , α-cubebene , α-humulene , β-bourbonene , caffeic acid , caryophyllene , caryophyllene oxide , catechin , chlorogenic acid , cis -3-hexenol , cis -ocimene , citral A , citral B , copaene , δ-cadinene , eugenyl acetate , γ-cadinene , geranial , geraniol , geranyl acetate , germacrene D , isogeranial , linalool , luteolin-7-glucoside , methylheptenone , neral , nerol , octyl benzoate , oleanolic acid , pomolic acid ((1 R )-hydroxy ursolic acid ), protocatechuic acid , rhamnazin , rosmarinic acid, stachyose , succinic acid , thymol , trans -ocimene and ursolic acid .   Lemon balm may contain traces of harmine . 
While photosynthesis is highly-evolved in the procaryotes, it apparently originated in the Bacteria and did not spread or evolve in Archaea . But the Archaea, in keeping with their unique ways, are not without representatives which can conduct a type of light-driven photophosphorylation. The extreme halophiles , archaea that live in natural environments such as the Dead Sea and the Great Salt Lake at very high salt concentration (as high as 25 percent NaCl) adapt to the high-salt environment by the development of " purple membrane ", actually patches of light-harvesting pigment in the plasma membrane. The pigment is a type of rhodopsin called bacteriorhodopsin which reacts with light in a way that forms a proton gradient on the membrane allowing the synthesis of ATP. This is the only example in nature of non photosynthetic photophosphorylation . These organisms are heterotrophs that normally respire by aerobic means. The high concentration of NaCl in their environment limits the availability of O 2 for respiration so they are able to supplement their ATP-producing capacity by converting light energy into ATP using bacteriorhodopsin.