#dialysis  separation of substances in solution my means of their unequal diffusion through semipermeable membranes
  supertype:  chemical_analysis__qualitative_analysis  the act of decomposing a substance into its constituent elements
  subtype:  apheresis  hemodialysis
  part:  osmosis__osmosi  diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal

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