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By John Barrett (auth.)

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Verticil/atum), trematodes (E. revolutum) and nematodes (A. lumbricoides). The latter also contain diacylglycerol alk-l-enyl ethers. Both diacylglycerol alkyl ethers and diacylglycerol alk-1-enyl ethers are quite widely distributed minor constituents of animal lipids (vertebrates and invertebrates). In A. lumbricoides cleavage of the ether link of diacylglycerol alkyl and alk-1-enyl ethers yields saturated and cx-f3 unsaturated C18 aldehydes. 27 LIPIDS Glycosylacylglycerols These occur in nervous tissue, but have not been reported in parasitic helminths.

However, a number of parasites have been found to contain relatively large amounts (5 to 10% of the phospholipids) of lysophosphatidy1choline (F. hepatica, T. hydatigena larvae, S. cervi, A. caninum) or lysophosphatidylethanolamine (T. spiralis larvae, Dipylidium caninum, S. mansoni eggs). In A. lumbricoides lipids, lysophosphatidy1choline, lysophosphatidylethanolamine and lysophosphatidylserine each comprise about 3% of the total phospholipids. 5. However, it must also be remembered that lysophosphoglycerides can arise by hydrolysis of the corresponding phosphoglycerides during extraction and analyses.

Equorum, A. lumbricoides, A. columnaris, A. 17). 5). In all cases, the glycone (sugar mOiety) appears to be the same, and is 3,6-dideoxY-L-arabinohexose (ascarylose), a sugar not found in any other eukaryote. Ascarylose has only been unambiguously identified in the ascarosides of P. equorum and A. 5 The structure of ascarosides . LIPIDS 33 but there is fairly good evidence that it is the glycone in the other species as well. The aglycones of the monol ascarosides are a mixture of long chain secondary alcohols, with the hydroxyl group on carbon 2 (L-2·alkanols).

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