Abstract: The present invention relates to a process and means for separating motile sperm cells in vitro from an aqueous sperm-containing sample by means of contacting said sample with a layer of an aqueous artificial penetration medium for sperm cells, said medium having incorportated therein a water-soluble physiologically acceptable salf of hyaluronic acid, whereby motile sperm cells are caused to migrate into said layer from said sperm-containing sample. The invention also comprises fertilization with sperm cells separated in this manner.

Abstract: A sterile aqueous solution containing 0.

Abstract: A pharmaceutical product containing amino groups, which product:A. is comprised of residues of one or more diamines of the general formulaH.sub.2 N.CH.sub.2. phenylene.CH.sub.2.NH.sub.2 (I)which residues are interconnected by bridges between the residues to form a three-dimensional network, the bridges being bound to nitrogen atoms in the residues (I) and comprise straight or branched aliphatic, saturated hydrocarbon chains substituted with one or more hydroxyl groups and containing 3-30 carbon atoms, preferably 3-16 carbon atoms and which are optionally broken by one or more oxygen atoms, the amino groups being present in a free form or in the form of (the cation portion of) a non-toxic salt, andB. is insoluble in water or other solvents, but capable of swelling in water to gel form, 1 g of the dry product in the form of an HCl salt in the presence of water swelling to at least 5 ml and to at most 50 ml, preferably to at least 5 ml and to at most 25 ml, andC.