[Cataract surgery at the Berlin Virchow clinic. Overview of the last 16 years].

Purpose: The aim was to compare the different techniques of cataract surgery regarding early postoperative astigmatism and visual acuity.

Patients And Methods: The data of three groups of patients (100 eyes) were analyzed retrospectively (1980-1982; 1987-1990; 1991-1993). Three different techniques of cataract surgery were used.

Separation of two hepatitis B human antibody fractions by cold-ethanol precipitation.

Antibodies to three different samples of hepatitis B antigen-positive serum were found to be absent from a Cohn fraction II hepatitis B immune globulin preparation, but present in the whole plasma from which the immune globulin was made. Fractions containing the antibodies specific for the three antigen samples were isolated from the plasma by euglobulin precipitation, and the antibodies were characterized as to immunoglobulin class and precipitability in the Cohn fractionation procedure. They appear to be IgG antibodies which, however, were detectable only in Cohn fraction I, while the remainder of the HB specificity present in the original plasma was found, as expected, in fraction II.

The Duffy blood group system: a review of recent developments.

Five antigenic specificities are associated with the Duffy blood group system. Fya, Fyb, By3 and Fy4 are under the genetic control of a locus near the centromere of chromosome 1. Fy5 is absent from Fy (a-b-) red cells and also from cells that have the Rhnull phenotype.