Spontaneous Assembly of lipid bilayers (membrane compartments)
1889 - B.J. Johnson creates a mixture of palm oil (palmitic fatty acid - 16C)
            and olive oil (oleic fatty acid - 18C) and makes Palmolive soap...

  

soap - is a salt (ionized with Na, Ca, or Li) of a fatty acids used as surfactants.
            Easily form micelles- tiny spheres of fatty acids with polar hydrophilic

            groups on aqueous side & hydrophobic fatty acid tail on the interior.
             *
  micelle
          micelle
A lipid bilayer is a thin membrane made of two layers of fatty acid P-lipid molecules. Membranes are flat sheets that form a continuous barrier around cells, and cell membranes of almost all living organisms & many viruses are made of a lipid bilayer       P-lipid
   
Lipids self-assemble into a bilayer structure because of the hydrophobic effect,
   which creates an energetically unfavorable interaction between the hydrophobic lipid tails
   and a surrounding water environment, thus a lipid bilayer is held together entirely by weak
   non-covalent forces that do not involve formation of chemical bonds between individual
   molecules
.
     bilayer        membrane
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