from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. That cannot permeate through a specified semipermeable membrane


Sorry, no etymologies found.


  • Some molecules move freely across the membrane, some are impermeant or very slowly permeant, and some move across the membrane depending upon pH.

    Another Protozoan and Front-Loading

  • Organelles are bounded by impermeant, lipid-rich membranes that ensure the physical and functional separation of vital biochemical processes.

    The Nobel Prize in Physiology or Medicine 1999 - Presentation Speech

  • When the researchers introduced its associated membrane-impermeant fluorogen, it bound to the FAP-tagged GPCR on the cell surface, emitting a bright fluorescent glow.

    Daily News & Analysis

  • Our cells use a clever and rather lazy scheme: they compensate for the high internal concentration of essential proteins by creating a high external concentration of some other substance, which is impermeant to the cell membrane.



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