The Origin of the Nitrates in the Urine
نویسندگان
چکیده
Nitrates appear to be constant constituents of human urine. Calculated as the potassium salt, human urine contains’ ordinarily 100 to 200 mg. of nitrate per liter, and occasionally 300 to 400 mg. or more. On normal rations other animals also excrete nitrates in the urine. The question of the origin of the urinary nitrates has not been settled satisfactorily, at least in the case of human urine. Thus the evidence is not conclusive as to whether they are derived only from the food or whether they are formed to some extent, by animal tissues. The problem is of peculiar theoretical interest, since the production of an oxidized nitrogenous radicle by R.nimal tissues would be unique. ,4 somewhat extended historical introduction to this rather obscure question seems necessary for a proper appreciation of the experiments described later.
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