Can someone explain to me what it means to have dextro amino digestive system(for example the quarians and turians)? Like what do they eat and why is it they cant eat human food.
I failed biology
Débuté par
Steve236
, févr. 21 2010 09:15
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#2
Posté 21 février 2010 - 09:47
marshalleck
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en.wikipedia.org/wiki/Chirality_%28chemistry%29#In_biology
note that the case of turians and quarians having "reverse" chirality from our own is pure science fiction
note that the case of turians and quarians having "reverse" chirality from our own is pure science fiction
Modifié par marshalleck, 21 février 2010 - 09:49 .
#3
Posté 21 février 2010 - 09:58
Steve236
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So quarians taste like sugar?hmmm..now that romance with tali doesnt seem so bad after all.
#4
Posté 21 février 2010 - 10:02
marshalleck
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Haha, well, I guess that's one way to look at it 
In a nutshell it means turians and quarians are made up of completely different amino acids...they are so radically different from humans that if you compared the DNA of a human, an apple tree, and a quarian, the human and tree DNA would be almost identical when compared to that of the quarian.
In a nutshell it means turians and quarians are made up of completely different amino acids...they are so radically different from humans that if you compared the DNA of a human, an apple tree, and a quarian, the human and tree DNA would be almost identical when compared to that of the quarian.
#5
Posté 21 février 2010 - 10:12
DirewolfX
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Hmm... I don't think they'd necessarily be that different. They'd just be like looking in a mirror.
I haven't found any evidence that eating dextro-amino acid based foods would make humans sick, though. In fact, evidence suggests that we'd break them down and reform them into levo-amino acids. Apparently dextro amino acids do exist in small quantities in some food items in nature.
I haven't found any evidence that eating dextro-amino acid based foods would make humans sick, though. In fact, evidence suggests that we'd break them down and reform them into levo-amino acids. Apparently dextro amino acids do exist in small quantities in some food items in nature.
#6
Posté 21 février 2010 - 10:15
marshalleck
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I think the codex talks about humans eating turian food and vice-versa. Depending on which amino acids are present, the reaction your body would have could range from simply ignoring it, and passing it through your system without deriving any significant nutrition from it to an acute allergic response including anaphylactic shock. I assume this information is based on whatever vetting they did when they came up with the whole reverse chirality aspect of turians and quarians.
So probably wise for humans to avoid turian cuisine and vice versa, just to be safe.
So probably wise for humans to avoid turian cuisine and vice versa, just to be safe.
Modifié par marshalleck, 21 février 2010 - 10:22 .
#7
Posté 21 février 2010 - 10:39
DirewolfX
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Yes, that's the Mass Effect Universe science. From what I've read about real science, they did some tests by feeding dextro-amino acid based proteins to real bacteria (levo-amino acid based, like us) and they just broke them down and rebuilt them as levo-amino acids.
#8
Posté 21 février 2010 - 10:48
Varenus Luckmann
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"Oops".DirewolfX wrote...
Yes, that's the Mass Effect Universe science. From what I've read about real science, they did some tests by feeding dextro-amino acid based proteins to real bacteria (levo-amino acid based, like us) and they just broke them down and rebuilt them as levo-amino acids.
#9
Posté 21 février 2010 - 10:51
marshalleck
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DirewolfX wrote...
Yes, that's the Mass Effect Universe science. From what I've read about real science, they did some tests by feeding dextro-amino acid based proteins to real bacteria (levo-amino acid based, like us) and they just broke them down and rebuilt them as levo-amino acids.
Nothing I said contradicts this if it's true. And what sort of bacteria were used? Were they similar to the beneficial bacteria in our own lower digestive system? If they aren't present in our systems breaking down those compounds and making them into something useful to our bodies, then it's an academic point that doesn't really change anything.
Modifié par marshalleck, 21 février 2010 - 11:04 .
#10
Posté 21 février 2010 - 11:43
brgillespie
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I imagine it would simply pass through our bodies, no harm done, no nutrition gained. The allergic response would be some other factor of the food, like someone allergic to seafood having an anaphylactic response to eating clams.
#11
Posté 21 février 2010 - 11:50
FrancisKitt
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I wonder if you can get a test done, the guard on Noveria talks about eating a donut, and I don't think he'd leave it to chance.
#13
Posté 22 février 2010 - 01:19
Pannamaslo
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Steve236 wrote...
gotta love fictional pseudo science
LOL. So true...
#14
Posté 22 février 2010 - 02:41
Akinra
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And now for the science bit...
It must be clearly stated that there is no evidence for the toxicity of D-ammo acids in humans, although their metabolic fate has not been definitely established. D-Amino acid oxidases have been demonstrated to be active in humans, but other factors could influence the metabolism of D-amino acids, such as rates of transport, action of intestinal enzymes and bacteria, absorption and renal clearance. However, no toxic effects have been observed following intravenous administration of chemically pure racemic amino acids to adults and infants19
in larger concentrations than expected to be consumed from normal food intakes. (Marchelli et al, 96. Trends in Food Science and Technology).
I don't work in food science myself (I'm in another area of cell biology) but from this article (which is quite old I admit) it seems that most food with dextro amino acids would be fine (at least not lethal). From other stuff I've read it seems that dextro amino acids would only be harmful when part of a protein. So food with dextro amino acids and not proteins based on dextro amino acids should be fine.
If that's true it would mean Mordin's warning about not ingesting would be correct. Poor Garrus.
It must be clearly stated that there is no evidence for the toxicity of D-ammo acids in humans, although their metabolic fate has not been definitely established. D-Amino acid oxidases have been demonstrated to be active in humans, but other factors could influence the metabolism of D-amino acids, such as rates of transport, action of intestinal enzymes and bacteria, absorption and renal clearance. However, no toxic effects have been observed following intravenous administration of chemically pure racemic amino acids to adults and infants19
in larger concentrations than expected to be consumed from normal food intakes. (Marchelli et al, 96. Trends in Food Science and Technology).
I don't work in food science myself (I'm in another area of cell biology) but from this article (which is quite old I admit) it seems that most food with dextro amino acids would be fine (at least not lethal). From other stuff I've read it seems that dextro amino acids would only be harmful when part of a protein. So food with dextro amino acids and not proteins based on dextro amino acids should be fine.
If that's true it would mean Mordin's warning about not ingesting would be correct. Poor Garrus.
#15
Posté 22 février 2010 - 02:46
medlish
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Steve236 wrote...
So quarians taste like sugar?hmmm..now that romance with tali doesnt seem so bad after all.
awesome.
#16
Posté 22 février 2010 - 03:54
JJDrakken
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Akinra wrote...
And now for the science bit...
It must be clearly stated that there is no evidence for the toxicity of D-ammo acids in humans, although their metabolic fate has not been definitely established. D-Amino acid oxidases have been demonstrated to be active in humans, but other factors could influence the metabolism of D-amino acids, such as rates of transport, action of intestinal enzymes and bacteria, absorption and renal clearance. However, no toxic effects have been observed following intravenous administration of chemically pure racemic amino acids to adults and infants19
in larger concentrations than expected to be consumed from normal food intakes. (Marchelli et al, 96. Trends in Food Science and Technology).
I don't work in food science myself (I'm in another area of cell biology) but from this article (which is quite old I admit) it seems that most food with dextro amino acids would be fine (at least not lethal). From other stuff I've read it seems that dextro amino acids would only be harmful when part of a protein. So food with dextro amino acids and not proteins based on dextro amino acids should be fine.
If that's true it would mean Mordin's warning about not ingesting would be correct. Poor Garrus.
Yes, but you'r a rebuilt Shepard, you drank Krogan Booze, that apparently would kill most folks & set off security alarms, most you got was passing out & feeling bit woozy for a minute or 2.
JJ
#17
Posté 23 février 2010 - 03:02
mattp420
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Akinra wrote...
...From other stuff I've read it seems that dextro amino acids would only be harmful when part of a protein. So food with dextro amino acids and not proteins based on dextro amino acids should be fine.
If that's true it would mean Mordin's warning about not ingesting would be correct. Poor Garrus.
Poor Tali.
Sorry, bad joke.
