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A glycoprotein antigen was isolated from the membrane of hydatid cysts of sheep and human origin. The constituent sugars of the carbohydrate moiety of this antigen are galactose, galactosamine, and glucosamine. The antigen shows a high P1 blood group activity when tested by hemagglutination-inhibition assay with anti-P1 sera. Moreover, it precipitates 11 out of 21 sera of human patients with echniococcosis. However, none of these sera has complete or incomplete agglutinating anti-P1 antibodies. The immunochemical analysis shows that P1 determinants reactive with anti-P1 sera, and antigenic determinants reactive with human precipitating antibodies are on the same macromolecule. Patients with cyst pulmonary localization show a higher reactivity as compared with those with hepatic localization. The immunodominant group involved in the precipitin reaction appears to be an α-galactosyl residue.

Viene esaminato lo spettro del bromo ottenuto con la scarica senza elettrodi nella regione 3000–2100 AA. La possibilita di regolare a volonta le condizioni di eccitazione ed operare in atmosfera di gas molto puro hanno permesso ricavare nuovi risultati; in questa prima Nota vengono esposti i seguenti: 1. Si ricava uno spettro totalmente continuo. 2. La banda continua 2930 A (FowlereStrutt) subisce un’evoluzione al variare dell’eccitazione che fa ritenere lo spettro continuo appartenente ad un livello di energia piu basso rispetto a quello che produce questa banda. 3. Viene identificato lo spettro di arco in questa regione.

The sensitivity of the indirect haemagglutination test for the diagnosis of hydatid disease, although high, is insufficient. Agar gel diffusion tests for the diagnosis of this disease have not received much attention in the past and have been considered unsatisfactory. The authors propose such a test and evaluate its results in comparison with those of the indirect haemagglutination test.