06-04-2012, 04:53 PM | #11 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
In an energy-negative process powered by sunlight. Doing some calorimetry, C6H12O6 (-1,271 kJ/mol) + 6O2(0) -> 6 CO2 (-393.5 * 6) + 6 H2O (-285.8*6). Left side is -1,271, right side is -4,074.6, so it takes 2,803 kJ/mol to induce this transformation.
Last edited by Anthony; 06-04-2012 at 04:59 PM. |
06-04-2012, 04:57 PM | #12 | |
Join Date: Jul 2008
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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That process costs a whole lot of energy. In the best-known example, that whole lot of energy is derived from sunlight.
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06-04-2012, 05:07 PM | #13 | ||
Join Date: Mar 2010
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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06-04-2012, 05:13 PM | #14 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
Well, I can't think of an interaction where it wouldn't be better to just keep its mouth shut and not breathe at all.
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06-04-2012, 05:19 PM | #15 | |
Join Date: Mar 2010
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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We've plenty examples of that in the here and now. |
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06-04-2012, 05:35 PM | #16 | ||
Join Date: Jul 2008
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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But then the oxygen side of the metabolism stops making any sense. Quote:
If it's not unrelated, then you don't have so much of a problem.
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06-04-2012, 05:42 PM | #17 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
That doesn't work given the described system -- by simply keeping its mouth closed, it can take the oxygen it produced, and recombine it with food to produce energy, instead of exhaling that oxygen. It would not take evolution very long to discover that trick. The big reason to inhale CO2 and exhale oxygen is because you have surplus energy and you want to produce hydrocarbons, either because you can burn them for energy at a later point when your current energy source isn't available (plants consume oxygen at night), or because you're going to use the hydrocarbon for some other purpose. You can also use the oxygen as a convenient way of poisoning anaerobic bacteria, which may be why blue-green algae developed oxygen synthesis, but none of these fit your described creature.
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06-04-2012, 06:01 PM | #18 | |
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Join Date: Sep 2004
Location: Southeast NC
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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06-04-2012, 06:32 PM | #19 | |
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Join Date: Sep 2004
Location: Southeast NC
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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What is the energy source and chemistry when they are in CO2 -> O2 mode? If they are getting their energy from food like terrestrial animals, it makes little sense to oxidize hydrocarbons to turn carbon dioxide into hydrocarbons and oxygen. Most other practical energy sources I can think of are either too diffuse (plants need huge areas to gather sunlight) or too dangerous (a creature that can tolerate an oxidizer capable of cracking carbon dioxide could drink bleach like it was lemonade) to be biologically likely.
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06-04-2012, 11:47 PM | #20 | |
Join Date: Jul 2009
Location: UK
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Re: [Build Advice] Model Anaerobic/Aerboic Breathing?
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Of course, if this is intended to be a "ignores science" racial feature, carry right on :) |
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Tags |
alien, aliens, anaerobic, build advice, doesn't breathe, increased consumption |
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