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Politics : Stockman Scott's Political Debate Porch
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To: lurqer who wrote (18119)4/27/2003 7:50:48 AM
From: Clappy  Read Replies (1) of 89467
 
More small:

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technologyreview.com

DNA Motor Keeps Cranking

Technology Research News April 15, 2003

Scientists working to harness DNA to construct and power
microscopic devices have gained an important tool.

Researchers at Lucent Technologies' Bell Labs and the
University of Oxford in England have found a way to keep
their DNA motor running continuously. Previously, the
researchers had to add particular strands of DNA at
different steps in the motor's cycle to keep it going.

The free-running DNA motor could eventually power
microscopic machines capable of constructing and
transporting chemicals and materials molecule by molecule.

A motor works by changing shape, then changing back again.
In previous work, the researchers coaxed to strand of DNA
into and out of a hairpin-like shape by causing a middle
portion of the strand to combine, then to combine with
another strand.

The researchers transformed that device into a free-running
motor by coaxing the portion of the strand that formed a
hairpin into a tight enough loop that it could not combine
directly with the second strand, but first needed a removal
strand to open the loop.

It is too early to tell when the devices could become
practical, according to the researchers. The work appeared
in the March 18, 2003 issue of Physical Review Letters.

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-StewartSmalley
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