By Dr. Lynn Margulis (auth.), Dr. Lynn Margulis (eds.)

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FERRIS: May I suggest what I think is a minimum method, and let people jump on me? We're discussing amino acids. The usual procedure is the identification on an amino acid analyzer. The technique from there is that of a retention 44 ORIGINS OF LIFE time on an amino acid analyzer: the conventional injecting the same material in, to see if your particular thing still gives you a symmetrical peak. The next step is an elution of the material: collect it from the amino acid analyzer, and do chromatography in two or three different solvent systems.

ORO: For whatever it may be worth, in our experience mass spec has given us no problems so far. ORGEL: What is the experience of the group? Does anyone disagree with Juan? By and large, with only rare exceptions is a mass spectrometric identification acceptable? USHER: Should we distinguish high resolution from low resolution? ORGEL: We are now talking of low resolution. PONNAMPERUMA: Certainly high resolution gives a much more refined picture. USHER: I have done much high resolution work, and can think of one example where microanalysis gave an indication of something which turned out to be what looked like the parent peak on this particular compound at low resolution.

You may not believe the evidence they provide is very powerful, but you couldn't possibly mean they supply no evidence at all. Otherwise we wouldn't use them. IDENTIFICATION AND CONTAMINATION 37 ORO: I use them to begin with, but they do not provide any unequivocal information. SAGAN: But nothing provides unequivocal information. This is why I want a numerical probability attached to each method. Even mass spectroscopy is not unequivocal. You may be bollixed by other compounds which gives a spurious cracking pattern exactly like your mass spectrum.

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