E I B DRESEL

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INTRODUCTION It is generally agreed that the most primitive type of nitrogenous excretory product, arising directly from the a-amino-N of proteins by deamination, is ammonia. In an extensive survey of the invertebrates, Delaunay (1927) was able to account for more than 50 % of the total non-protein nitrogen (N.P.N.) excreted in terms of ammonia in a large(More)