History Main / NoBiochemicalBarriers

14th Sep '17 9:09:11 PM PaulA
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* Slightly averted, yet mostly played straight, in Julian May's ''Literature/GalacticMilieu Trilogy/Pliocene Exile saga''. The Ship specifically searched for a highly compatible world for the Tanu/Firvulag, only finding one several galaxies over and dying in the process of getting them there. Later, the Milieu is largely composed of mostly biologically compatible species - the Krondaku are uncomfortable on Earth, as it lacks enough oxygen and has twice the gravity of their homeworld (although it supplies some of the galaxy's top-notch booze); the Gi are also a light-grav species (although more socially incompatible); normal enough for the mostly photosynthetic Simbiari (although high concentrations of [=CO2=] are an intoxicant); eminently compatible for the Poltroy, if a little warm and lacking in those so-tasty sulfites; it's a good question if the Lylmik even ''have'' a metabolism, being mostly incorporeal, but if they ever did it was pretty wild (the few glimpses of their ecosystem are alien in the extreme, and explicitly stated to be artificially constructed to be at least slightly compatible with all the other races); and the strangest human of the lot, Jack the Bodiless, is perfectly compatible because he requires little more than light and the odd organic molecule, and is otherwise completely unaffected by the environment.

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* Slightly averted, yet mostly played straight, in Julian May's ''Literature/GalacticMilieu Trilogy/Pliocene Exile saga''.Trilogy/Literature/SagaOfTheExiles''. The Ship specifically searched for a highly compatible world for the Tanu/Firvulag, only finding one several galaxies over and dying in the process of getting them there. Later, the Milieu is largely composed of mostly biologically compatible species - the Krondaku are uncomfortable on Earth, as it lacks enough oxygen and has twice the gravity of their homeworld (although it supplies some of the galaxy's top-notch booze); the Gi are also a light-grav species (although more socially incompatible); normal enough for the mostly photosynthetic Simbiari (although high concentrations of [=CO2=] are an intoxicant); eminently compatible for the Poltroy, if a little warm and lacking in those so-tasty sulfites; it's a good question if the Lylmik even ''have'' a metabolism, being mostly incorporeal, but if they ever did it was pretty wild (the few glimpses of their ecosystem are alien in the extreme, and explicitly stated to be artificially constructed to be at least slightly compatible with all the other races); and the strangest human of the lot, Jack the Bodiless, is perfectly compatible because he requires little more than light and the odd organic molecule, and is otherwise completely unaffected by the environment.
5th Sep '17 4:57:01 PM Peteman
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* Brutally averted in ''Anime/EurekaSevenAO'' when it turns out that the trapar-rich atmosphere is [[spoiler:deadly to [[HalfHumanHybrid human-Coralien hybrids]] as well as non-adapted humans, prompting Renton to send his family to another dimension]].

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* Brutally averted Averted in ''Anime/EurekaSevenAO'' when it turns out that the trapar-rich atmosphere is [[spoiler:deadly to [[HalfHumanHybrid human-Coralien hybrids]] as well as non-adapted humans, prompting Renton to send his family to another dimension]].
5th Sep '17 2:35:46 AM PaulA
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* Averted in "Literature/TheWhispererInDarkness", where it's mentioned that the alien visitors "could not eat the things and animals of earth, but brought their own food from the stars".
29th Aug '17 1:59:57 AM PaulA
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* Present Creator/UrsulaKLeGuin's Hainish novels. Characters from one planet frequently live on other planets, sometimes for years at a time (Genly, a Terran, on Gethen in ''Literature/TheLeftHandOfDarkness'' and Old Music, a Hainishman, on Werel in several short stories, among others). May be justified given that all of the people involved evolved from a common race, the Hainish, and so may have sufficiently similar biology to be able to eat one another's foods without complication.

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* Present in Creator/UrsulaKLeGuin's Hainish Literature/{{Hainish}} novels. Characters from one planet frequently live on other planets, sometimes for years at a time (Genly, a Terran, on Gethen in ''Literature/TheLeftHandOfDarkness'' and Old Music, a Hainishman, on Werel in several short stories, among others). May be justified given that all of the people involved evolved from a common race, the Hainish, and so may have sufficiently similar biology to be able to eat one another's foods without complication.
9th Jul '17 3:35:12 PM DarkHunter
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** ''Andromeda'': On Kadara, the planet's water has a heavy sulfuric acid content. So potent that it can dissolve steel alloys in seconds. If Drack (a krogan) is in the landing party:
--->'''Drack''': I bet I could drink it.\\
'''Lexi''': ''[exasperated]'' No, Drack, no.


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** ''VideoGame/MassEffectAndromeda'': Habitat 7, while originally a viable candidate for a human colony, had its atmosphere altered by the Scourge and is now toxic to human lungs. The kett don't seem to have a problem with it, though they can also breathe atmospheres comfortable for humans.
9th Jul '17 3:27:25 PM DarkHunter
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** A minor plot point in ''VideoGame/MassEffectAndromeda'': one human colonist that's woken up is found to have a deadly and extremely contagious disease. She runs from the Nexus before it becomes contagious, but then everyone worries that if the angara (the natives of this sector of Andromeda) can contract it, there could be a pandemic. [[spoiler:In the end, the woman is located and it's discovered that the angara are totally immune to her disease... so some alien-hating angara hit upon using the disease as a bioweapon against the Milky Way "invaders".]]
9th Jul '17 3:23:18 PM DarkHunter
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** ''VideoGame/MassEffectAndromeda'' continues the shenanigans in another galaxy, as several characters work on finding edible plant life. The angara render all their food into a nutrient paste for maximum efficiency; apparently this is edible by Milky Way species but not very tasty. Jaal samples some Milky Way food, and complains that most of it is bland, though he also finds out that while angara are not affected by capsaicin (spicy foods) there is something in human sweets that makes his throat burn.
30th Jun '17 1:40:35 AM bfunc
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** In the ''Literature/IntoTheLookingGlass'' series, mostly co-written with Creator/TravisSTaylor, the alien food is used as a diet plan, because while filling, it has no nutritional value, and thus doesn't provide energy in a form human biochemistry can use. Used in that anyone from one of the four biological patterns (called Green, Blue, Red and Orange based on the version of chlorophyll found) can eat anything of that pattern. However, even same-pattern foods may or may not be nutritious, or even safe- there's just a better chance of it being digestible.

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** In the ''Literature/IntoTheLookingGlass'' series, mostly co-written with Creator/TravisSTaylor, the alien food is used as a diet plan, because while filling, it has no nutritional value, and thus doesn't provide energy in a form human biochemistry can use. Used in that anyone from one of the four biological patterns (called Green, Blue, Red and Orange based on the version of chlorophyll found) can eat anything of that pattern. However, even same-pattern foods may or may not be nutritious, or even safe- safe[[note]]though Earth plants presumably use the same "biological pattern" as humans, in real life some of them are poisonous anyway[[/note]] - there's just a better chance of it being digestible.
30th Jun '17 12:49:57 AM bfunc
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* '''All Atmospheres Are Equal''' - While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' -- presumably, AllPlanetsAreEarthlike.

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* '''All Atmospheres Are Equal''' - While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example) example[[note]]though nitrogen is unreactive enough that it's commonly used in glove boxes when an inert atmosphere is needed[[/note]]) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' -- presumably, AllPlanetsAreEarthlike.
6th Jun '17 5:52:39 PM AnonFangeekGirl
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