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• s  (of a membrane) selectively permeable

• These compact units force pressurized water across semipermeable membranes.
• In typical kidney machines, the blood is pumped past a semipermeable membrane via a complex network of tubes and pumps.
• Hardy and plentiful as they seem, frogs are actually very frail things, with a semipermeable skin that leaves them vulnerable to even the slightest hiccup in their environment.

News & Articles

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• Harvesting Power When Freshwater Meets Salty
  ckwu writes "As a way to generate renewable electricity, researchers have designed methods that harvest the energy released when fresh and saline water mix, such as when a river meets the sea. One such method is called pressure-retarded osmosis, where two streams of water, one saline and one fresh, meet in a cell divided by a semipermeable membrane. Osmosis drives the freshwater across the ...
  Dec. 2, 2013 - Slashdot

Quotes

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• Vivian Balakrishnan in New York Times
  That's part of the secret to our success: maintaining this semipermeable membrane,said Vivian Balakrishnan, a former eye surgeon who as Minister for Community Development, Youth and Sports oversees the effort to enliven Singapore. "Make it...