By Dana Bell
London released army historical past - Air
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Extra info for A-10 Thunderbolt II - Warbirds Illustrated No. 40
Although the use of ''C-labelled acetates and propionates had demonstrated that they were precursors in the formation of rifamycin S it was only by the use of various '3C-precursors and assignments of the NMR spectra that the labelling pattern from acetate and propionate was established . 13C-NMR has also been used t o establish the biosynthetic pathway of streptovaricin D; the use of sodium [ l -"C]propionate established that the amide carbonyl was derived from the carboxyl group of propionate .
This final oxidation reaction, originally performed in Rittenberg tubes, has been recently modified so that the final oxidation may be semi-automated [ 102-1031. Critical appraisal of both methods for the production of nitrogen gas including inherent difficulties has been presented [ 1041, as have corrections required for atmospheric contamination of samples [ 1051. Oxygen-18. The most widely employed method for determination of oxygen isotopic content of water is equilibration with COZ followed by analysis of the COz isotopic ratio [106,107].
In both instances the enrichments measured are often large and it is normal practice to express the enrichment of a particular fraction as compared to the same fraction prior to the introduction of the labelled compound to the system. In such cases most workers express enrichment of isotopic content as either atom% or atom% excess which have been defined earlier (p, 5). Where "N is used at low enrichments and measured in an isotopic ratio instrument normally equipped to monitor the mle 28 and mle 29 ion beams, the following formula is applicable: atom% 5N= 100 2V28P291 +1 where I, = intensity of mle x .
A-10 Thunderbolt II - Warbirds Illustrated No. 40 by Dana Bell