Spontaneous chirality formation.

[metherion]

DOOOOOD. DOOOOOOOOOOOOD.

Life scientists unlock mystery of how 'handedness' arises

I found this super interesting, because the research for my master's thesis includes chiral amino acids.

Metherion

 

[juvenissun]

DOOOOOD. DOOOOOOOOOOOOD.

Life scientists unlock mystery of how 'handedness' arises

I found this super interesting, because the research for my master's thesis includes chiral amino acids.

Metherion

So, there are two types of people based on their protein chirality. Any idea on what these two types of people are in other characters? Do evolutionists have one type and creationists have another type (left wing and right wing?)?

 

[DaneaFL]

So, there are two types of people based on their protein chirality. Any idea on what these two types of people are in other characters? Do evolutionists have one type and creationists have another type (left wing and right wing?)?

Gay Scientists Isolate Christian Gene - YouTube

 

[metherion]

So, there are two types of people based on their protein chirality. Any idea on what these two types of people are in other characters? Do evolutionists have one type and creationists have another type (left wing and right wing?)?

Nothing of the sort, nor do I recall the article saying anything of the sort.

Life on earth is made up entirely of amino acids of one chirality. The experiment done in the article showed that when microfilms of non-spiral triangular structures were made, they spontaneously developed chirality and formed into chiral superstructures, and it's believed it's because of entropy.

Really neat origin of life stuff

Metherion

 

[florida2]

Nothing of the sort, nor do I recall the article saying anything of the sort.

Life on earth is made up entirely of amino acids of one chirality. The experiment done in the article showed that when microfilms of non-spiral triangular structures were made, they spontaneously developed chirality and formed into chiral superstructures, and it's believed it's because of entropy.

Really neat origin of life stuff

Metherion

Pretty awesome

Is it that we use right handed carbs and left handed amino acids, or something along those lines?

 

[SithDoughnut]

BROOOOOOO.

That's pretty cool, bro.

 

[metherion]

Is it that we use right handed carbs and left handed amino acids, or something along those lines?

Carbohydrates are almost all D, amino acids are L, so yes. (fun story, there are 3 naming systems, so it took me a moment to remember) And this might help explain why, which is neat

Metherion

 

[Lion Hearted Man]

Awesome to see more work done on this subject. Takes me back to my old OChem days and drawing stereoisomers and trying to figure out R or S...

 

[Michael]

DOOOOOD. DOOOOOOOOOOOOD.

Life scientists unlock mystery of how 'handedness' arises

I found this super interesting, because the research for my master's thesis includes chiral amino acids.

Metherion

Very cool stuff. Nature is really awesome.

 

[juvenissun]

Nothing of the sort, nor do I recall the article saying anything of the sort.

Life on earth is made up entirely of amino acids of one chirality. The experiment done in the article showed that when microfilms of non-spiral triangular structures were made, they spontaneously developed chirality and formed into chiral superstructures, and it's believed it's because of entropy.

Really neat origin of life stuff

Metherion

Do you mean ALL lives?
If so, would it also be universal? Do we find similar chirality on organics from comets?

Can we make something with the opposite chirality in the lab?

 

[metherion]

As far as I know, all life on earth is made up of amino acids of one only chirality. The others exist, and are synthesizable in lab. My master's research actually deals with separation of chiral pairs (they're very hard to separate), and it's quite difficult to make only one chirality. It's easiest to just make a batch of the compound, and then try to separate it. Trying to make only the left or right handed one usually requires either an extended reaction scheme or biological synthesis.

As far as stuff on comets, as far as I know there hasn't been life found on comets. There's no reason life on other planets couldn't be made up of the opposite chirality from that on earth, or a mixture, it just so happens that on earth, only one chirality is found to be used by life.

Metherion

 

[thaumaturgy]

DOOOOOD. DOOOOOOOOOOOOD.

Life scientists unlock mystery of how 'handedness' arises

I found this super interesting, because the research for my master's thesis includes chiral amino acids.

Metherion

I actually found Robert Hazen's work (LINKY) to be more intriguing (Especially "Selective adsorption of l- and d-amino acids on calcite: Implications for biochemical homochirality") . This is an interesting concept but I personally feel that inorganic surface selectivity for chiral adsorption is more directly related to this kind of thing.

Note that the article you cited relates to "dense systems". There are some things which may stereoselect or wind up with a bias of one enantiomer over another, but I am uncertain if that would be related to this concept outlined here.

This really does seem more "physics" related and an interesting result of random motion of achiral particles packed together, but I don't know how that would translate as clearly as the hypothesis that some mineral substrates will selectively adsorb one chirality over another in a natural setting.

Just my 2 cents.

 

[juvenissun]

As far as I know, all life on earth is made up of amino acids of one only chirality. The others exist, and are synthesizable in lab. My master's research actually deals with separation of chiral pairs (they're very hard to separate), and it's quite difficult to make only one chirality. It's easiest to just make a batch of the compound, and then try to separate it. Trying to make only the left or right handed one usually requires either an extended reaction scheme or biological synthesis.

As far as stuff on comets, as far as I know there hasn't been life found on comets. There's no reason life on other planets couldn't be made up of the opposite chirality from that on earth, or a mixture, it just so happens that on earth, only one chirality is found to be used by life.

Metherion

Just wild guesses. May be it is related to the orbiting and the rotation of the earth (and/or moon). All their movements are unidirectional (right-handed?). May be try to synthesize amino acid or some kind of biological system on a satellite which flies toward the other direction.

 

[thaumaturgy]

Just wild guesses. May be it is related to the orbiting and the rotation of the earth (and/or moon). All their movements are unidirectional (right-handed?). May be try to synthesize amino acid or some kind of biological system on a satellite which flies toward the other direction.

This is where some chemistry knowledge comes in handy. This is a topic in organic synthesis reactions called "stereoselectivity and stereospecificity". When a molecule that is chiral is synthesized often it forms a "racemic mixture" in which the two stereoisomers are produced in roughly equal proportions, but sometimes due to the conformations of the molecule ("stearic factors") it is easier for a reaction to run where it selects for one stereoisomer over another.

Here's an example of a nucleophilic substitution reaction (SN1) that is NON-stereospecific:

And here's an SN2 reaction that results in one stereoisomer forming in greater quantity than another:

But this gives a bit of insight into why specific adsorption may result in a given stereoisomer selectivity.

It could be that a reaction results in a racemic mixture but nearby mineral surfaces selectively adsorb only one stereoisomer, or it could be that if you have a reaction that requires a catalytic surface that may bias the outcome by orienting some of the reactants.

 

[juvenissun]

This is where some chemistry knowledge comes in handy. This is a topic in organic synthesis reactions called "stereoselectivity and stereospecificity". When a molecule that is chiral is synthesized often it forms a "racemic mixture" in which the two stereoisomers are produced in roughly equal proportions, but sometimes due to the conformations of the molecule ("stearic factors") it is easier for a reaction to run where it selects for one stereoisomer over another.

Here's an example of a nucleophilic substitution reaction (SN1) that is NON-stereospecific:

And here's an SN2 reaction that results in one stereoisomer forming in greater quantity than another:

But this gives a bit of insight into why specific adsorption may result in a given stereoisomer selectivity.

It could be that a reaction results in a racemic mixture but nearby mineral surfaces selectively adsorb only one stereoisomer, or it could be that if you have a reaction that requires a catalytic surface that may bias the outcome by orienting some of the reactants.

I wish I could understand what you said. But, thanks.
I only know many minerals have chirality. But I never know why.