[ox] Nano-Tech [was: Bakterien- Composites als Nano- Fabber?]
- From: "Soenke Zehle" <soenke.zehle web.de>
- Date: Fri, 21 Nov 2003 15:14:15 +0100
Hier noch 'was zum Thema Nano-Tech, ausserdem einige Orgs, die sich mit der
oekopolitischen Dimension (sozusagen) der Nano-Technologie beschäftigen:
<http://www.i-sis.org.uk/>
<http://www.etcgroup.org/>
<http://www.piecesetmaindoeuvre.com>
ISIS hat z. B. gerade einen kritischen Kommentar zum Thema Nano-Tubes (s.u.)
veröffentlicht.
Die EU widmet sich dem Thema Nano - welche Überraschung - u. a. aufgrund
ihrer vermeintlichen Umweltfreundlichkeit, erinnert mich an die Art und
Weise, wie in der unsäglichen Agenda 21 die Themen Biotechnologie,
Biologische Vielfalt, und Nachhaltigkeit in einem biotechnologischen Nexus
auf durchaus industriefreundliche Weise verknüpft wurden:
<http://www.cordis.lu/fp6/nmp.htm>
sz
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Nano-transistor self-assembles using biology
======================
A functional electronic nano-device has been manufactured using
biological self-assembly for the first time. Israeli scientists at the
Technion used proteins to allow carbon nanotubes to bind to specific
sites on strands of DNA and turned the remainder of the DNA molecule
into a conducting wire. The work has been greeted as 'spectacular'.
The researchers coated a central part of a long DNA molecule with
proteins from an E. coli bacterium. Next, graphite nanotubes coated with
antibodies were added, which bound onto the protein. After this, a
solution of silver ions was added. The ions chemically attach to the
phosphate backbone of the DNA, but only where no protein has attached.
Aldehyde then reduces the ions to silver metal, forming the foundation
of a conducting wire. To complete the device, gold was added, which
nucleates on the silver and creates a fully conducting wire.
The end result is a carbon nanotube device connected a both ends by a
gold and silver wire, which operates as a transistor when a voltage
applied across the substrate is varied. This causes the tubes to either
bridge the gap between the wires - completing the circuit - or not.
New Scientist / Science - November 20, 2003
<http://www.newscientist.com/news/news.jsp?id=ns99994406>
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