[Cyborg] the nose knows
Tomm
tomm.fire at gmail.com
Fri Feb 18 20:07:26 UTC 2011
Who knew that drosphilia (and perhaps humans) might be able to perform
vibrational spectroscopy in their nose?
http://pipeline.corante.com/archives/2011/02/18/smell_the_vibrations_fruit_flies_might_be_able_to_.php
"They're checking to see if Drosophila (fruit flies) can tell the
difference between deuterated and non-deuterated compounds. The idea
here is that the size and shape of the two forms are identical; there
should be no way to smell the difference. But it appears that the flies
can: they discriminate, in varying ways, between deuterated forms of
acetophenone, octanol, and benzaldehyde. Deuterated acetophenone, for
example, turns out to be aversive to fruit flies (whereas the normal
form is attractive), and the aversive quality goes up as you move from
d-3 to d-5 and d-8 forms of the isotopically labeled compound.
The flies could also be trained, by a conditioned avoidance protocol, to
discriminate between all of the isotopic pairs. Most interestingly, if
trained to avoid a particular normal or deutero form of one compound,
they responded similarly when presented with a novel pair, which seems
to indicate that they pick up a "deuterated" scent effect that overlays
several chemical classes."
(deuterated means replacing all of the hydrogens in the molecule with
the heavy form of hydrogen, deuterium, which has two neutrons instead of
one neutron).
A less technical article is here:
http://news.sciencemag.org/sciencenow/2011/02/do-vibrating-molecules-give-us-o.html?rss=1
and some background on the theory:
https://neurophilosophy.wordpress.com/2006/12/12/the-quantum-mechanics-of-smell/
Tomm
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