Quote (Deify7 @ Wed, Oct 7 2009, 04:51pm)
Calling me small-minded person? And you are the one who believes in the Mill-Urey experiment. Man, you have a lot of nerve so let me prove you wrong.
Miller-Urey experiment = does not prove life could have arisen from non-living material. Why?
First, Miller used the gases ammonia, methane, hydrogen, and water vapor which were charged with an electric charge and then condense to form soup which contained two amino acids. Well there are several problems to this and I will show you what they are:
- Miller specifically did not include oxygen because he knew that it in primitive Earth conditions oxygen would be poisonous to newly formed life. However, if you have no oxygen then you have no ozone layer. If you have no ozone layer then the sun's rays would kill any living thing instantaneously. Not only that, but the rays would destroy amonia as well. So, if you have oxygen then it would be poisonous to life; if you do not have oxygen then life could not have started.
- Miller used a close system (glass tubing) and thus would not be an ideal experiment considering Earth is an open system.
- The two amino acids produced were called "left-handed" amino acids and you must have the "right-handed" amino acids to actually make something. Also, I believe you need twenty amino acids for life and this experiment made two.
- Over 97% of the "soup" he created was/is toxic to life.
- Lastly you must remember that (even though this is not entirely important) Miller made this experiment happen which contradicts the theory of Evolution which suggests that living material erose from life through chance.

wow... aaah I don't even know where to start.. Flat out, you are 100% wrong.. I would love to read whatever you did to come to this conclusion because I dont think you could be more off-base...
Again, your statements just prove that you are the type of person who reads 1 bias article and takes it for the truth.. Please allow me to prove you wrong, Sir.
--You DID actually get this part right, he did use water, methane, ammonia, and hydrogen.
--Miller did not include oxygen in his experiment because it didnt exist in the beginning of our Earth. This is backed by the formation of hematite bands on the Ocean floors, the evolution of photosynthesis, roughly 2.5 billion years ago, released enough oxygen into the atomosphere to oxidize the free iron in the primative oceans and precipitate into hematite. And in response to your ramble about the Ozone and radiation, I guess first of all you would need to define which Rays you are talking about because a molten iron Earth would completely negate any presence of cosmic rays. However, since you mention the ozone also I will assume you are discussing UV radiation. In a short answer, Water. Between the very intense heat and evaporation that the early Earth contained, and the almost constant volcanic eruptions; The amount of water molecules in the early Earth's atmosphere reflected enough (or all depending on the experiment you read) UV radiation to protect the surface and even the lower altitudes of the atmosphere where abiogenesis would have been talking place.
--A closed system?? every experiment ever conducted is done in a controlled environment, that is what gives you accurate, unaltered results.... but just FYI, the Earth would have been the same "closed system" when looking from a cosmological perspective, and I assure you that the glass tubing didn't contribute anything to the experiment so your statement is without bearing.
-- 1) There where 5 amino acids that Miller identified in his experiment, not 2, and a later re-run of his experiment and re-analysis of his work identified 22 amino acids!. 2) Life on Earth is overwhelmingly dominated by construction of Left-handed Amino Acids.. I even got a source you can read for that 1 so you believe me..
http://web99.arc.nasa.gov/~astrochm/aachiral.html ..... but, now I am sure you will tell me NASA is wrong and you are right.. 3) Ok first of all the Miller-Urey experiment didnt say "these amino acids made life on Earth" it was a simple showing that the fundemental building blocks of life were made by the process the experiment used. The number of amino acids needed to make "life" depends on who's definition of life you are using, and as previously mentioned the experiment wasn't intended as the "Origin of life on Earth"
-- and 70% of all statistics are made up, on the spot... Again who's definition of toxic are you going by? AND what definition of LIFE are you going by, because by definition, the entire early EARTH was toxic to life, not just Miller's soup. However, I would like to remind you that toxic to one thi*ng is an opportunity to thrive to another.. google extremophiles and enjoy!
-- A mute point to argue indeed.. but abiogenesis fits into the evolutionary puzzle because it preceeds true evolution, Evolution states that life comes from pre-existing life, but people always argured, then where did the first life come from?!??! abiogenesis answers that question by showing that non-living materials, through chemical reactions, can form building blocks for living material, then that living material can aggregate into the first truly living organisms, THEN Evolution takes over to explain how the first organisms gave rise to complex organisms and then the muti-celled creatures and "animals" (bacteria)
P.S. if you would like to really argue against abiogenesis I highly suggest that, in the future, you use the arguement that abiogenesis can not yet account for the pairing of the first DNA and protiens and how they came to be because as we understand biology today, they require each-other to exist, a kind of.. chicken before the egg problem..
This post was edited by Topher_Laid on Oct 7 2009 09:25pm