Author Topic: Cameron commissions deep sea sub for Avatar 2 filming  (Read 4469 times)

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Offline Ftiafpi

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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #40 on: May 13, 2011, 01:07:00 pm »
Any earth spiders taken to Pandora accidentally would die on the ISV.

Any Pandoran spiders would most likely die in the airlock. Human air is probably as toxic to Pandoran life, as Pandoran air is to terrestrial life. Probably.
They both have an oxygen-based metabolism. It wouldn't be nice for one to breathe Earth air, but that's more due to pollution than anything else. A human can survive in a 100% oxygen environment (as long as there are no sources of ignition...) with no problem, carbon dioxide is not a requirement in the atmosphere. Hydrogen sulphide is toxic - the (comparative) absence of it is not going to pose a problem, and the other gases are all ones like xenon which are almost completely inert under anything other than specific extreme conditions.

If you watch the background stuff in the bio lab and the shack, all plant samples are kept isolated, with gas/air pipes connected to many of them. This doesn't prove anything I know, but I feel it adds weight to the notion that the two biologies are wholly incompatible.
That would be to provide an optimal environment - plants DO need CO2 in the atmosphere, but animals do not. It's entirely plausible that a plant might not be able to survive in a much lower concentration, but animals do not perform photosynthesis. Both ecosystems are carbon-based, oxygen/nitrogen atmosphere.

Makes sense from my limited biology understanding.

Offline archaic

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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #41 on: May 18, 2011, 10:40:25 am »
Any earth spiders taken to Pandora accidentally would die on the ISV.

Any Pandoran spiders would most likely die in the airlock. Human air is probably as toxic to Pandoran life, as Pandoran air is to terrestrial life. Probably.
They both have an oxygen-based metabolism. It wouldn't be nice for one to breathe Earth air, but that's more due to pollution than anything else. A human can survive in a 100% oxygen environment (as long as there are no sources of ignition...) with no problem, carbon dioxide is not a requirement in the atmosphere. Hydrogen sulphide is toxic - the (comparative) absence of it is not going to pose a problem, and the other gases are all ones like xenon which are almost completely inert under anything other than specific extreme conditions.

If you watch the background stuff in the bio lab and the shack, all plant samples are kept isolated, with gas/air pipes connected to many of them. This doesn't prove anything I know, but I feel it adds weight to the notion that the two biologies are wholly incompatible.
That would be to provide an optimal environment - plants DO need CO2 in the atmosphere, but animals do not. It's entirely plausible that a plant might not be able to survive in a much lower concentration, but animals do not perform photosynthesis. Both ecosystems are carbon-based, oxygen/nitrogen atmosphere.
All this is pure speculation of course, and all that you say is plausible. However we do not know what the requirements of alien biochemistry are, it is possible that Pandoran life is Hydrogen sulfide dependent. You may not be aware that oxygen is toxic to some earth bacteria. 100% oxygen environments are less safe than is generally believed, they can cause brain damage and blindness in humans.
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Offline Human No More

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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #42 on: May 20, 2011, 09:00:10 am »
Any earth spiders taken to Pandora accidentally would die on the ISV.

Any Pandoran spiders would most likely die in the airlock. Human air is probably as toxic to Pandoran life, as Pandoran air is to terrestrial life. Probably.
They both have an oxygen-based metabolism. It wouldn't be nice for one to breathe Earth air, but that's more due to pollution than anything else. A human can survive in a 100% oxygen environment (as long as there are no sources of ignition...) with no problem, carbon dioxide is not a requirement in the atmosphere. Hydrogen sulphide is toxic - the (comparative) absence of it is not going to pose a problem, and the other gases are all ones like xenon which are almost completely inert under anything other than specific extreme conditions.

If you watch the background stuff in the bio lab and the shack, all plant samples are kept isolated, with gas/air pipes connected to many of them. This doesn't prove anything I know, but I feel it adds weight to the notion that the two biologies are wholly incompatible.
That would be to provide an optimal environment - plants DO need CO2 in the atmosphere, but animals do not. It's entirely plausible that a plant might not be able to survive in a much lower concentration, but animals do not perform photosynthesis. Both ecosystems are carbon-based, oxygen/nitrogen atmosphere.
All this is pure speculation of course, and all that you say is plausible. However we do not know what the requirements of alien biochemistry are, it is possible that Pandoran life is Hydrogen sulfide dependent. You may not be aware that oxygen is toxic to some earth bacteria. 100% oxygen environments are less safe than is generally believed, they can cause brain damage and blindness in humans.
Oxygen levels are almost the same - I was just using it an example to say that the lack of CO2, Xe, Ar, etc. does not harm a human or other animal - oxygen toxicity is a separate issue which is beside that point (I could have pointed out that they can also survive if they entered a sealed room where all the CO2 was replaced by additional N2). Life on Pandora is known to be carbon-based. A biological use for H2S could theoretically be an issue, but is unlikely since there is already sufficient supply in foods and the use of sulphur in organic compounds is relatively low - either way H2S does exist in an Earth atmosphere, just at a far lower concentration.
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Offline archaic

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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #43 on: May 21, 2011, 08:44:01 am »
A biology that evolved in a H2S atmosphere is more likely to need atmospheric H2S than be able to take it from food. We need Oxygen, but we can't survive on oxygen in food.

Also something that has bugged me for a very long time about the quoted constituents of Pandoran atmosphere. Why is it so toxic to humans?
"Remember people, you lose your mask, you’re unconscious in 20 seconds, you’re dead in four minutes."

Is the data reliable, or just another RDA cover up? ;)
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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #44 on: May 22, 2011, 12:20:54 am »
That would probably be the CO2.

Looks like some topic drift is occurring...


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Offline archaic

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Re: Cameron commissions deep sea sub for Avatar 2 filming
« Reply #45 on: May 22, 2011, 07:26:52 am »
1) You may be right, plus "The hydrogen sulfide present is also quite poisonous; concentrations over 1000 ppm (0.1 %) can cause immediate collapse with subsequent loss of breathing, even after inhalation of a single breath." http://james-camerons-avatar.wikia.com/wiki/Pandora

2) You're right. Sorry.
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