Individual polymer-like micelles formed in aqueous mixtures of lecithi
n and bile salt were quantitatively investigated using cryo-transmissi
on electron microscopy (cryo-TEM). The overall size obtained from cryo
-TEM agrees with results from independent light-scattering measurement
s on the same sample. This demonstrates that cryo-TEM experiments not
only provide direct structural information but furthermore enable a qu
antitative determination of bulk properties of individual micelles.