[Proteins and their reactive groups in the roe and sperm of roach and bream]

The content of proteins soluble in the phosphate buffer in the mature eggs and sperm of the bream is higher than that in the corresponding cells of the roach. The eggs of both the roach and bream is richer in these proteins than the sperm. The amount of SH- and S-S-groups in proteins of sex cells is not the same and varies depending on the fish species. The ionization coefficient value for lateral groups of proteins soluble in the phosphate buffer at 245 and 300 nm is lower for the eggs of the roach as compared to that of the bream and for the sperm of the roach, vice versa, it is higher than for the bream sperm. This index for proteins of the roach and bream eggs at 245 and 300 nm is higher considerably as compared to that established for sperm.