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02-10-2002, 08:09 PM | #281 | |||||
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End of part I of my response. |
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02-10-2002, 11:53 PM | #282 | |||||
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There was no Adam. There was no Eve. Quote:
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Ed, you have a great deal of learning to do. And, so far, you haven't shown any sign of beginning your journey. Until you do, you are wasting everyone's time. |
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02-11-2002, 07:12 PM | #283 | |||||||||||
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02-11-2002, 11:00 PM | #284 | ||||||
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Imagine a cloud with density rho and radius r. It has mass M ~ rho*r^3. Imagine that it changes size by a factor x. Its gravitational self-energy is GM^2/r; its change with a size change is - (GM^2/r)*x Its internal-pressure energy is P*r^3, and a change in it is (rho*a^2*r^3)*x where a is the speed of sound in the cloud. The combined effect is (rho*a^2*r^3 - G*rho^2*r^5)*x -- if the multiplier of x is positive, then the cloud will have a "bounce" and be stable; otherwise, it will collapse under its own weight. And the minimum size for doing so is the Jeans radius, which is r ~ a/sqrt(G*rho) Let's see if Ed can follow this reasoning. Since we all know how supersmart he is, we expect that he should have no trouble doing so. |
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02-11-2002, 11:49 PM | #285 | |
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Ed, it's perfectly obvious that you're just making up this crap on the spot. Isn't it time to admit that this whole thread is just a joke? |
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02-13-2002, 07:14 AM | #286 | ||||||||||
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[ February 13, 2002: Message edited by: Ed ]</p> |
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02-13-2002, 07:06 PM | #287 | |||||||||
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02-13-2002, 11:45 PM | #288 | |||||||||||
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First, I'm disappointed that
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Having gotten those two files, notice that you can manipulate them separately, with changes in one not being reflected in the other. Ed, if you choose to do this experiment, you'll be teaching yourself a bit of genetics, so why not? And there are big loads of evidence of gene duplication in the history of life. I will give only a few of them: Most vertebrate hemoglobin consists of a protein tetramer containing two "alpha" subunits and two "beta" subunits; all of them have one iron/porphyrin (heme) group each. One can find molecular family trees with the alpha and beta sequences -- and one finds that they diverged from a common ancestral sequence not long before the divergence of the shark and a group containing the bony fish and the land vertebrates. So some long-ago fish had suffered a duplication of its hemoglobin gene, with the two copies then evolving to produce the familiar tetramer. Hemoglobin-gene duplications have happened more than once; human fetuses have a special variety of hemoglobin that is recognizably related to the adult variety. Also, homeobox genes, which specify front-to-rear patterning, are likely duplicates of some ancestral gene; comparison of fruit fly and mouse homeobox genes indicates that mice have 4 sets of homeobox genes, each of which corresponds with the fruit-fly set, though the mouse genes have some drop-outs. Quote:
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02-14-2002, 07:37 PM | #289 | |
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02-14-2002, 08:24 PM | #290 | ||||||
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