Amino 1500

I work in research and development of plastics. Do you know your math.
Homochirality and chance

By constructing a simple model of the synthesis of amino acids, make the following hypothesis: left and right handed amino acids were uniformly distributed throughout the earth at the beginning. Assume also that at least 500 amino acids are needed to form a polymer operation.

Thus, the probability that a strand of 500 amino acids long is 100% of the left hand is simply. This type of statistic, reported in other books [5], is simply the multiplication rule. Embedded is the assumption that the selection of amino acids is independent and identically distributed. It is questionable this assumption (ie the functionality of independence) and claim that natural selection has been used to obtain a component of 100% of the left hand. However, by definition, natural selection can not be formed before the formation of life, because there is no life to select [3].

Imagine that the synthesis of amino acids was strong enough to allow the greatest number of 10 of the 500 amino acids to be right handed. Then we could set up a statistical hypothesis test base. The null hypothesis would be that blind chance, was used in the formation of amino acid strand. In other words, P0 = 50%, since blind chance does not distinguish between L and D amino acids. The alternative hypothesis is that p> p0, where p is the actual probability. Let W be a random variable with a distribution (bin N, p0), where n = 500. Ie 0,001 is our level of significance (a). Then:



This result shows that we can reject our null hypothesis in favor of our alternative hypothesis (p> p0). If we made a two-tailed test with p a‰  p0 alternative hypothesis, the statistic above is twofold. Even with the statistical doubled, the test indicates that blind chance, is clearly insufficient to select 490 or more amino acids (the same orientation) 500.

In addition, we can estimate a confidence interval of 99% for P using the Moivre-Laplace theorem [6]. Let x0 = 2.575, n = 500 and Sn = 490 (since we allow 10 right-handed amino acids). Then by the theorem:





Note that the upper limit for p greater than 1! This occurs for two reasons: we analyze the extreme tail of the binomial distribution, and there is an approximation made in isolating P. Therefore, to maintain the confidence interval, let us correct the error and pass both the limits to the left of 0.03. The result tells us that 99% of the time, our confidence interval [0.89, 1] p will be bound.

According to the statistics above relatively simplistic, we can rule out chance as blind as a cause of homochirality. Using either intuition or mathematical rigor, the scientific community has already reached the same conclusion that we have. Even Stanley Miller admits, "There is no way, I think you will sort the D and L amino acids in separate pools [2].

Instead, scientists have tried to find natural causes for an initial enantiomeric excess (greater abundance of orientation of amino acids). Once the excess can be explained, then homochirality may well be possible, they say. Here are the theories most visible

There may be a bias in the natural selection of the left hand of amino acids that comes from various sources, such as a difference of potential energy. This bias may be amplified by reactions like Soai reaction [7].
forms of life have been the oldest to the original racemic, and the feature of homochirality may have evolved later [2].
Some parts of space can be generated amino acids left more often than right-handed amino acids. A collection of predominance of the left hand amino acids could be transported to earth by meteorites (such as the Murchison meteorite) [8].
.