Phoebus A. Levene

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All nitrogenous substances completely metabolized in the organism of mammals are removed by the urine in form of urea. Every other nitrogenous constituent of the urine is either a substance which has for one reason or another escaped its final transformation, or has not been metabolized by the organism at all. Under metabolism here, of course, is understood(More)
In a communication to the Chemical Society ~ one of us reported on the property of aminoacids to form insoluble phosphotung-states. In a later publication 2 the writers showed the degree of precipitability of aminoacids by means of phosphottmgstic acid, and stated that a separation of aminoacids may be accomplished by means of this reagent. The attempt was(More)
1. For the study of the character of nitrogen metabolism in nephritis the nitrogen intake of the patient needs to he regulated in such a manner that it should not exceed the nitrogen value which the diseased kidneys are capable of eliminating. 2. The eliminating capacity of the kidneys can he established in the following manner: the patient is placed on a(More)
In my article on Phloridzin Glyeosuria, published in 1894,* I had in view the demonstration of two propositions: (1) That there existed no sut~cient grounds for v. Noorden's assumption that phloridzin glyeosuria does not at all resemble any forms of spontaneous diabetes mellitus, and that, therefore, the mechanism of this experimental glycosuria cannot be(More)
In a previous communication on tryptie digestion of gelatine one of us (Levene) reported the finding of a substance having the composition CTHi0N202.1 The mode of separation of this substance was fully described in an article published by G. Wallace and one of us (Levene 2). In the previous publications the supposition was expressed that the substance might(More)
In testing several egg lecithin preparations prepared by ourselves it was found that they did not react in complement fixation tests with immune sera made by injections with commercial egg lecithin Merck. With the flocculation method two of the preparations reacted only faintly. Also the brain lecithin and hydrolecithin gave no distinct reactions. The(More)
Thus, our conclusions harmonize with those of Brugsch and Schittenhelm in so far as they are concerned with the nuclein metabolism. They add, however, the observation that the elimination of nitrogenous substances of protein origin has a protracted character, and that the oxidation of as simple a substance as asparagin proceeds at a subnormal rate. The most(More)
1. The tripeptide glycyl-levo-alanyl-glycine in solution of either one or ten equivalents of alkali does not undergo racemization on standing. 2. The dipeptide levo-alanyl-glycine under the conditions given in (1) does not undergo racemization. 3. In ketopiperazines, levo-alanyl-glycine anhydride and in levo-prolyl-glycine anhydride under the influence of(More)