On 20 Jun 2014, at 22:51, John Mikes wrote:
They ARE black! Our eyes err. - Without joke:
how about those plants that are not green? do they have a chlorophyl
variation that is not green? or a different photosynth-mechsm?
I think they contain chlorophyl, + other pigments, which plays some
role in their exploitation of light, but don't know much about this.
Bruno
JM
On Thu, Jun 19, 2014 at 8:15 PM, LizR <[email protected]> wrote:
I have long thought that plants should be black, too, for this
reason. Anyone know why not?
On 20 June 2014 11:40, 'Chris de Morsella' via Everything List <[email protected]
> wrote:
Perhaps because the two mechanisms function quite differently and
apparently evolved independently. But I also sometimes wonder why in
the many hundreds of millions of years of time that no species has
found a way to utilize the missing chunk of spectrum.
A perfect plant would have jet black leaves -- and use photons
across all wavelengths of the spectrum. Then there truly would be
black forests.
Chris
Bacteriorhodopsin - Boundless Open Textbook
Bacteriorhodopsin - Boundless Open Textbook
Bacteriorhodopsin acts a proton pump, generating cellular energy in
a manner independent of chlorophyll. Read more about
bacteriorhodopsin in the Bou...
View on www.boundless.com
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Bacteriorhodopsin acts a proton pump, generating cellular energy in
a manner independent of chlorophyll.
KEY POINTS
Bacteriorhodopsin is a proton pump found in Archaea, it takes light
energy and coverts it into chemical energy, ATP, that can be used by
the cell for cellular functions.
Bacteriorhodopsin forms chains, which contain retinal molecule
within, it is the retinal molecule that absorbs a photon from light,
it then changes the confirmation of the nearby Bacteriorhodopsin
protein, allowing it to act as a proton pump.
While chlorophyll based ATP generation depends on a protein
gradient, like bacteriorhodopsin, but with striking differences,
suggesting that phototrophy evolved in bacteria and archaea
independently of each other.
[snip]
These [bacteriochlorophylls ] also produce a proton gradient, but in
a quite different and more indirect way involving an electron
transfer chain consisting of several other proteins. Furthermore,
chlorophylls are aided in capturing light energy by other pigments
known as "antennas"; these are not present in bacteriorhodopsin-
based systems. Last, chlorophyll-based phototrophy is coupled to
carbon fixation (the incorporation of carbon dioxide into larger
organic molecules) and for that reason is photosynthesis, which is
not true for bacteriorhodopsin-based system.
From: meekerdb <[email protected]>
To: [email protected]
Sent: Thursday, June 19, 2014 10:51 AM
Subject: Re: Solar power's "bright future" [ may be brighter thanks
to us aping the quantum trickery of certain algae (cryptophytes
specifically)]
On 6/18/2014 3:15 PM, 'Chris de Morsella' via Everything List wrote:
>>But it does illustrate the way evolution can get stuck in a local
optima. And also further evidence that any purported Creator must be
completely incompetent.
Evolution always must begin with a preexisting platform -- so to
speak -- and builds on top of it (in an evolutionary way).
Yes, I'd heard the story about the purple bacteriodopsin that used
the middle part of the visible spectrum. But the implication is
that these bacteria were shading the bacteria or algae that
developed chlorophyll. Which might be true, but they've not been
shading them for the last billion years or so since plants came onto
the land. So I don't see it has a local optimum. There's a big
chunk of spectrum right there adjacent to the spectrum being used.
There doesn't seem to be any significant barrier.
Brent
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