Get Homological invariants of modules over commutative rings PDF

By Paul Roberts

ISBN-10: 2760604993

ISBN-13: 9782760604995

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Ah, but carbon-14 has a trump up its sleeve The key molecules of the cells are the genes I mentioned earlier. It is change in these which can bring about mutations and cancer. These genes contain no potassium atoms in their molecule. Any potassium-^o atoms present in the cell are located elsewhere than in the gene. Beta particles that shoot ! out of an exploding potassium-40 atom must strike a gene molecule just right or must give rise to a free radical which will though you were standing in a globular shooting gallery, blindfolded, and aimed at random in the hope of hitting a few tiny targets placed here and there on the walls, floor and ceiling.

If such a machine were hollow, there would be room in it for one thousand universes such as ours, including all the stars and galaxies and all the space between the various stars and galaxies as well. Now let us suppose that the computing machine was completely filled from edge to edge and from top to bottom with tiny computing units, each one of which could test different combinations of hemoglobin amino-acids in order to see whether it was the hemoglobin combination or not. In order to make sure that the computing units are as numerous as possible, let's suppose that each one is no larger than the least voluminous object known, the single neutrino.

In that case, the total number of hemo40 is io globin molecules on Earth, human and nonhuman, Even this number, unfortunately, is nowhere near the hemolife. Let's be generous . number and globin so it will not serve as a comparison. Let us bring in the element of time and see if that helps us The average red blood cell has a life expectancy of about one third of a year. After that it is broken up and a new red out. blood cell takes its place. red blood cell is Let us suppose that every time a new formed, it contains a completely new set of 40 hemoglobin molecules.

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Homological invariants of modules over commutative rings (Seminaire de mathematiques superieures) by Paul Roberts

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