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The synthesis of the Drosophila pigments droso- and isodrosopterin ( 7 ) from 7.8-dihydropterin ( 3 ) and 2-hydroxy-3-oxobutyric acid ( 4 ) is described. A reaction mechanism is discussed and proven by isotope experiments. Droso- and isodrosopterin form in weak acidic medium in the presence of NH ions two red reaction products each one of which seems to be identical with neodrosopterin. 相似文献
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The convective diffusion equation for the downstream distribution of products and intermediates produced on a tube electrode under conditions of laminar flow is solved. For distances which are large compared to the thickness of the electrode, an analytical solution in real space can be found. The solution of the equation has been applied to an apparatus in which the intermediates and products are detected by e.s.r. The species are transported by laminar flow from the electrode through an e.s.r. cavity. Results are presented for two systems and are found to be in good agreement with the theory. 相似文献