[A rare increase in the incidence of Siamese twin deliveries (author's transl)].

Between 1964--1978 4 pairs of siamese twin were born among 28,039 deliveries. The incidence was 1 : 7009. Three pairs of siamese twins were delivered vaginally and died during delivery.

Studies on new process procedures in plasma fractionation on an industrial scale. I. Determination of the pH value of ethanol containing protein solutions at low temperatures.

A suitable combined pH electode is evaluated which provides reproducible readings under the extreme conditions of the cold ethanol plasma fractionation procedure. Adequately reproducible correlations are found between the pH measurements in protein solutions with an ethanol content of up to 40% at temperatures as low as -8 degrees C and the determination in diluted samples at room temperature using the standard procedure.