Science and Culture Today Discovering Design in Nature
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selectivity filters

airport security
Photo credit: danjo paluska, via Flickr (cropped).

Secrets of Active Transport Become Visible

TSA workers at airports could never boast of this much quality control in their authentication protocols. Read More ›
traffic cop

Security Gates in the Cell

A key characteristic of life is active transport: control over what enters and exits the cell. Closer looks reveal exquisite “selectivity filters” with moving parts that make active transport work. Read More ›
Origin-channel-unlabeled

Membrane Channels Show Astonishing Specificity

The “selectivity filters” in membrane channels of living cells are able to discriminate between very similar molecules or atoms using complex mechanisms. Read More ›

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