Types of Canine Serum Immunoglobulins

Studies of canine serum immunoglobulins demonstrated preparations considered to be canine γG and γM. and Canine γA and γE are provisionally identified. Antisera specific for these immunoglobulins were prepared. Canine reaginic antibody reactivity was absorbed from the fractions with an antibody prepared against the serum fraction considered to contain canine γE but not with rabbit antisera against canine γA, γM or γG.

The solubilities of the lower testosterone esters

The solubilities of the formate to valerate esters of testosterone have been determined in water and several organic solvents. The aqueous solubilities decrease logarithmically as the homologous series is ascended, but the acetate is less soluble than anticipated in the organic solvents. The variation in solubility from ester to ester can be predicted in the organic solvents from thermodynamic data, and is a reflection of the differences in melting point. The melting point differences are explained from the space group dimensions and the area of α to α face contact in the crystals.

The geographical distribution of Burkitt's tumour compared with the geographical distribution of other types of malignant lymphoma in Uganda

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Relative importance of formiminoglutamic and urocanic acid excretion after a histidine load

A thin-layer chromatographic method for the simultaneous assessment of formimino-glutamic (Figlu) and urocanic acid excretion after loading with 15 g. histidine has been applied to 15 control subjects and to 49 selected patients. Upper limits of normal excretion were determined for urocanic acid and Figlu alone (15 mg. and 30 mg/8 hr. respectively), and for the combined metabolites (40 mg./8 hr.). Of the 49 patients studied, 27 excreted total metabolites above 40 mg./8 hr.; of these 19 would have been revealed by their abnormal excretion of Figlu and 22 by their abnormal excretion of urocanic acid. Of 74 tests in the 64 subjects, urocanic acid was present in all but 27% of the tests, and in 29.8% of the tests urocanic acid was in excess of the amount of Figlu excreted. In six normal and six abnormal tests urocanic acid was the sole metabolite present. These results re-emphasize the value of estimating both histidine metabolites in tests for folate deficiency in man, and underline the greater relative importance of urocanic acid.