Re: basic question about light


"Randy Poe" <poespam-trap@xxxxxxxxx> wrote in message news:1171023849.729057.285510@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Feb 8, 5:24 pm, "Androcles" <Engin...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:
"Randy Poe" <poespam-t...@xxxxxxxxx> wrote in messagenews:1170952542.670726.97310@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[A photon] is absorbed by a pigment molecule in your retina.

Are TV signals absorbed by aluminium molecules in the antenna?

Biological and man-made systems use different strategies. Visual
pigments are not conductors. Their electrons are bound to them,
not free as in an antenna.
Here's a partial description of the transduction process:
(from http://webvision.med.utah.edu/photo1.html)

"Upon absorption of a photon of light, the retinal isomerizes from
the 11-cis form to an all-trans form which starts conformational
changes in the molecule resulting in bleaching. Several intermediaries
are formed in bleaching among them metarhodopsin II which activates
the G-protein transducin and a further cascade of events summarized
below (see review by Hargrave and McDowell (1992) and by Archer,
1995).
"Light transduces the visual pigment via the following enzyme
cascade:
photons - rhodopsin - activated rhodopsin (metarhodopsin II) - a GTP
binding protein (transducin) - an enzyme hydrolyzing cGMP
(cGMP-phosphodiesterase) - closes a membrane bound cGMP-gated
cation channel."

utah.edu, huh? The mormon home of cold fusion, wasn't it?
Thanks for the word soup, I'm sure it would have been all very
interesting if I'd bothered to read it.

I hope you'll agree that "isomerizing resulting in bleaching" or "an
enzyme cascade" is not a description of anything that happens in
an aluminum antenna upon absorption of a photon. It is, however,
what happens in your eye.

I hope you'll agree that antennae come in different sizes, with
giraffement
http://www.mccullagh.org/db9/10d-17/giraffe-1.jpg

to shrewment
http://www.taiga.net/wmac/consandmanagementplan_volume3/graphics/photos/shrew.jpg


molecules with pigment
http://www.snoopy.com/comics/peanuts/meet_the_gang/images/meet_pig_pen_big.gif

molecules
somewhere in the middle to do the photon absorbing, but you
didn't answer my question, Blind Poe. Please note the word
"basic" in the thread title.

Which part of :
"Are
TV
signals
absorbed
by
aluminium
molecules
in
the
antenna?"
did you not understand?


.

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