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Scientists Repeat Evolution's Most Famous Experiment

grmcdorman

Graduate Poster
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Hot on the heels of the article I just pointed out in the Toronto Star that was (mostly) favourable of evolution comes this from Scientific American:

Link is at sciam dot com, /article.cfm?chanID=sa004&articleID=9952573C-E7F2-99DF-32F2928046329479

Primordial Soup's On: Scientists Repeat Evolution's Most Famous Experiment
Their results could change the way we imagine life arose on early Earth

Quote:
When Miller repeated the experiment using the correct combo in 1983, the brown broth failed to materialize. Instead, the mix created a colorless brew, containing few amino acids. It seemed to refute a long-cherished icon of evolution—and creationists quickly seized on it as supposed evidence of evolution's wobbly foundations.

But Bada's repeat of the experiment—armed with a new insight—seems likely to turn the tables once again.

Bada discovered that the reactions were producing chemicals called nitrites, which destroy amino acids as quickly as they form. They were also turning the water acidic—which prevents amino acids from forming. Yet primitive Earth would have contained iron and carbonate minerals that neutralized nitrites and acids. So Bada added chemicals to the experiment to duplicate these functions. When he reran it, he still got the same watery liquid as Miller did in 1983, but this time it was chock-full of amino acids. Bada presented his results this week at the American Chemical Society annual meeting in Chicago.
Another one on the evolution side of the board, and a strike for creationism/ID. :D
 
Hot on the heels of the article I just pointed out in the Toronto Star that was (mostly) favourable of evolution comes this from Scientific American:

Link is at sciam dot com, /article.cfm?chanID=sa004&articleID=9952573C-E7F2-99DF-32F2928046329479

Primordial Soup's On: Scientists Repeat Evolution's Most Famous Experiment
Their results could change the way we imagine life arose on early Earth

Quote:Another one on the evolution side of the board, and a strike for creationism/ID. :D

With all the energy spent trying to separate the concept of abiogenesis from the concept of evolution, especially when talking to creationists (e.g., jesus_freak) on this site, why are you claiming that the Miller-Urey experiment "proves" evolution?
 
With all the energy spent trying to separate the concept of abiogenesis from the concept of evolution, especially when talking to creationists (e.g., jesus_freak) on this site, why are you claiming that the Miller-Urey experiment "proves" evolution?

Actually lots of stuff proves evolution. As you have been repeated shown on the thread you started. That's why scientists all over the world, not only accept it, but look towards how it all started. That is abiogenesis. How does life evolve from non life--we had a lot of the pieces of the puzzle...now we have examples of the building blocks coming from a blend of natural elements and energy. For most biologists, even creationist ones like Francis Collins--evolution was has been proven for some time. But they always hold that god had to be behind the start of it. Most scientists know that many things formerly attributed to invisible entities like gods or demons are now attributed to natural forces (things like tornados, for example). We have long sensed that this was true of abiogenesis--as well--each step of the puzzle allows us to learn more. Defaulting to "goddidit" is a dead end. It's useless for furthering understanding. And this means there's a decent chance that there is some sort of beginning life forms on Mars. So it's celebretory.

I think it's time you admit you are a creationist. To not do so, is dishonest--especially after Dr. A. defended you. And your lack of curiosity or even basic understanding on the subject confirms it. You hear what you need to hear and see what you need to see to justify the beliefs you want to have.
And you chastize those who take an extra effort to help you learn because they believed you were sincere in your inquiry.

I'm not sure your "intelligent designer" condones deception.
 
I think perhaps that some of the "confusion" about what I am saying cones from the fact that I posted the link to the wrong thread. This is the thread which I am talking about.
 
Actually lots of stuff proves evolution.

...

I think it's time you admit you are a creationist. To not do so, is dishonest--especially after Dr. A. defended you. And your lack of curiosity or even basic understanding on the subject confirms it. You hear what you need to hear and see what you need to see to justify the beliefs you want to have.
And you chastize those who take an extra effort to help you learn because they believed you were sincere in your inquiry.

I'm not sure your "intelligent designer" condones deception.

No matter what mijopaalmc's BA-wielding ;) belief background is, he has a point ; many threads here have to repeat ad nauseam that the theory of evolution is not disproven by lack of proof for abiogenesis, so equally we evilutionists ought not to say that evidence for abiogenesis is evidence for evolution. Against creationism possibly, but that's different.

(Of course, the original article headline is not much help!)

mijopaalmc, I take it that this is all you are implying by your post?
 
No matter what mijopaalmc's BA-wielding ;) belief background is, he has a point ; many threads here have to repeat ad nauseam that the theory of evolution is not disproven by lack of proof for abiogenesis, so equally we evilutionists ought not to say that evidence for abiogenesis is evidence for evolution.

That may be his point -- but if so, his point is incorrect. The theories are independent but linked, and I feel confident in claiming that abiogenesis-without-evolution is philosophically ill-founded, but that evolution-without-abiogenesis is not only philosophically well-founded, but has even been explored by some well-regarded scientists.

At the most fundamental level, the theory of evolution states that life forms arise via differentiation of other life forms. It doesn't make any statement about how the first life form arose. There's nothing in "evolution" that prohibits God making the first cell or the first nucleic acid, or time-travelling space aliens from Voltaria IV dropping a half-eaten sandwich covered in BEM germs that went on to become us.

Abiogenesis, on the other hand, asserts that a life form originated from non-life. That's it. The process by which other life forms originated is left open.

The idea of abiogenesis without evolution is silly. Somehow, clay and organic soup turned into something amoeba-like -- but then, that amoeba just sat there and divided for millions of years? Where, then, did rabbits, rats, and raccoons come from? Are you seriously suggesting that rabbits and rats were placed here in their present form by God (or the Voltarians) but amoeba spontaneously came into existence? Perhaps I need to look up a stronger word than "silly."

On the other hand, evolution-without-abiogenesis is at least plausible, even if it's not supported by any evidence at all.

A more mundane analogy may help. Suppose that I claim that last month, I was in Toronto, Ontario (while a murder was going on in a distant town, or something). You exhaustively search for any record of me in a hotel registry and fail to find something. Does that prove I wasn't in Toronto?

Of course not. Just because I was in Toronto doesn't mean I stayed at a hotel. Perhaps I stayed at a friend's house, or perhaps my partner rented the room and signed the register. But on the other hand, if I can produce the hotel receipt (and register), that's strong evidence that I was actually in Toronto.

It's the old "absence of evidence" gambit. Demonstrating a plausible theory for abiogenesis adds weight to the theory of evolution. But simple failure to find such a theory doesn't detract from it. Not finding a hotel receipt doesn't mean I wasn't in the city.
 
If someone can find the line between abiogenesis and evolution, please let me know.

~~ Paul
I think the line between abiogenesis and evolution is laregly artificial and created for PR purposes. The mainstream scientific community have not proposed any realistic mechanism of abiogenesis. This distinction allows evolutionary theorists to evade obvious questions by claiming that the two problems are different.
In logic, a satisfactory theory of abiogenesis must cohere with the theory of evolution which means that there will be no formal dividing line between them.
 
Drkitten said:
At some point, there were no self-replicating systems.

At another point, a first self-replicating system originated.

Le voila!
First of all, are you sure your first point ever existed? Second, if abiogenesis encompasses nothing other than some self-replicating crystal or clay or such like, then I guess I'll grant you the boundary. But I don't think that's what most people mean by abiogenesis.

I think the line between abiogenesis and evolution is laregly artificial and created for PR purposes. The mainstream scientific community have not proposed any realistic mechanism of abiogenesis. This distinction allows evolutionary theorists to evade obvious questions by claiming that the two problems are different. In logic, a satisfactory theory of abiogenesis must cohere with the theory of evolution which means that there will be no formal dividing line between them.
But the two problems clearly are different, at far ends of the spectrum. Would anyone question the basic theory of evolution just because abiogenesis is an active, unsolved problem? I agree that ultimately they must cohere.

~~ Paul
 
Let's not get distracted by issues related to the damned creationists.

Beautiful reexamination of a classic experiment.

Beautiful new experiment.

Beautiful.
 
Actually lots of stuff proves evolution. As you have been repeated shown on the thread you started. That's why scientists all over the world, not only accept it, but look towards how it all started. That is abiogenesis. How does life evolve from non life--we had a lot of the pieces of the puzzle...now we have examples of the building blocks coming from a blend of natural elements and energy. For most biologists, even creationist ones like Francis Collins--evolution was has been proven for some time. But they always hold that god had to be behind the start of it. Most scientists know that many things formerly attributed to invisible entities like gods or demons are now attributed to natural forces (things like tornados, for example). We have long sensed that this was true of abiogenesis--as well--each step of the puzzle allows us to learn more. Defaulting to "goddidit" is a dead end. It's useless for furthering understanding. And this means there's a decent chance that there is some sort of beginning life forms on Mars. So it's celebretory.

I think it's time you admit you are a creationist. To not do so, is dishonest--especially after Dr. A. defended you. And your lack of curiosity or even basic understanding on the subject confirms it. You hear what you need to hear and see what you need to see to justify the beliefs you want to have.
And you chastize those who take an extra effort to help you learn because they believed you were sincere in your inquiry.

I'm not sure your "intelligent designer" condones deception.

Y'know, articulett, I bet if you paid more attention to what I actually said rather than what you think I said and stopped applying silly double standards, I think that would get along alot better and possibly come to respect eachother. You accuse me of ignoring the vast store of information offered to me by you and other posters, yet you don't seem to take the time to even glance at my posts before denouncing them as creationist clap-trap.

Since geoman correctly intepreted what I was asking in my question, I hope you read his post and took the time to thoroughly absorb and understand it. Nevertheless, I will try to explain the intent of my question in my own words.

My intent was to point out the inconsistency with which information is disseminated in the forum as a whole, above the level of individual posters. As I pointed out, a thread was recently posted with the hopes of answering some of jesus_freak's questions abot the science of evolution in which his initial question was:
How did life start? I know you will say evolution has nothing to do with the begining of life, but at some point non life had to evolve into life. Is that fair?
which he followed up with:
Ok here is another question then...
When, where, why, and how did life learn to reproduce itself?
both of were met with a resound "abiogenesis is not evolution" argument from the other posters, which strangely included drkitten who is also claiming here that somehow my objection to equation of abiogenesis with evolution makes me a creationist despite her rather emphatic posts against such an equation in the aforementioned thread. For people who are so interested in honesty (which in this case means that the same person should not use the same data to support two contradictory conclusions), you seem to be applying a gross double standard when you accuse me of seeing only what I what to see in the post while you collectively either affirm or deny the the equation of abiogenesis with evolution simply because the affirmation allows you to claim that the title reproduction of the Miller-Urey experiment proves that evolution is real, while the denial allows you to avoid tough questions about how the lack of a definite pathway for abiogenesis (although there are many candidate pathways) effects the underpinning of evolution.

My personal belief (although it is irrelevant to my critique of the inconsistencies in the dissemination) is that abiogenesis and evolution are two separate issues in biology. Since two componenets of the definiton of life are 1) that life replicates itself and 2) that life evolves, if abiogenesis is defined as an emergence of self-replicating (i.e., living) organisms from non-self-replicating (i.e., non-living precursors), abiogenesis by definition excludes evolution, which only happens in living organisms. I realize that such a formulation assumes not only that if something is alive then it evolves (which is in the defintion) but also that if something evolves then it is alive. In other words, life and evolution are logically biconditional (i.e., something is alive if and only if it evolves or evolution is a neccesary but not sufficient condition for life). You can feel free to pick at my definitions and conclusions drawn thereof, but please refrain from calling me a creationist simply because you disagree with or misunderstand me.

Now that I have delineated my understanding of abiogenesis and its relation to evolution which is at least in part corroberated by TalkOrigins in the seciton of the Index to Creationist Claims on abiogenesis (labeled CB on the page), especially CB090: Evolution without biogenesis and some correspondence in the archive that speak of confusion of abiogenesis with evolution or other forms of that phrase, I would like to re-emphasize its irrelevance to my critique. Regardless of what I belive about the relationship between abiogenesis and evolution, the information was still conveyed inconsistently, seemingly to support evolution despite the internal contradiction in the logic. This appears equally as devious as my alleged pretense of being confused while trying to advocate a creationist postion, yet you insist that it is acceptable for you to perform in defense of evolution.
 
If someone can find the line between abiogenesis and evolution, please let me know.

~~ Paul

I was going to say this.

Separating life from non-life is a fasle dichotomy. I don't know why people feel obliged to distinguish evolution from biogenesis. We are complex, competing chemical reactions. Even if those chemical reactions are simpler and occur without the benefit of distinct membrane boundaries, they are still evolving.

Athon
 
The point is that evolution can only apply to systems that can replicate themselves and have natural selection weed out beneficial mutations from the rest.

Abiogenesis does NOT use that process. Since there is no self replication at first, there can be no natural selection. It is basically completely random until one of those amino acid chains is able to replicate itself, and then evolution takes over.

There, you have a non-arbitrary definition and there's a good reason to point this out. Before self replicating systems, one can't say there is natural selection for rocks, or planets, or stars, or anything of the sort. No process is making the stars with planets more likely to survive than the others. No process is making planets that are more earthlike more likely to survive than others. No process, with these amino acids, makes one chain more likely to survive than others, UNTIL one can self replicate, at which point that chain is the one most likely to survive and natural selection can finally take place.

The thing is, creationists like to draw cosmology and everything else into evolution like they are related. Yes, we depend on an earthlike planet, but it sure doesn't depend on us, and that's the roughest way of putting the point.
 
I don't see the problem in admitting that it would be nice to have an answer to the question about the beginning. No, it does not invalidate the Theory of Evolution not to know exactly what happened, but it sure wouldn't hurt to know.

I see mijopaalmc's point, but I think it's valid to see this finding as a strength for evolution, while still wanting to keep abiogenesis and evolution separated.

Theory E depends on either A, B or C to be true (f.inst abiogenesis, transpermia or deist-god). In isolation the lack of evidence for A does not necessarily invalidate E, while evidence for A is a strength for E.
 
Hey I want to know how it all started as much as anyone else. I never said I would rather this information NOT be available, nor do I think anyone else here has.
 

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