Abstract: Polyclonal and monoclonal antibodies that specifically bind senescent cell derived inhibitor protein (SDI-1), cell lines that produce such monoclonal antibodies, and the use of such antibodies are disclosed.

Abstract: A dry, solid, water-swellable absorbent composition of matter is prepared by blending together (a) a water-insoluble absorbent polymer and (b) from 1 to 75%, by weight of the blend, of an extender material selected from uncrosslinked cellulose derivatives, starch, certain clays and minerals, or mixtures thereof. The composition is characterized by having an absorbency exceeding the sum of the absorbencies, calculated proportionately, of the individual components. In one preferred embodiment, the absorbent polymer is a water-swellable ionic complex of a water-soluble anionic polyelectrolyte and a polyvalent metal cation having a valence of at least three.

Abstract: Polystyrene and styrene copolymers are simultaneously crosslinked and sulfonated in a homogeneous reaction mixture by incorporation of from 0.1 to 5 mole percent of specific crosslinking reagents in the polymer sulfonating solution. The crosslinking reagents are selected aryl compounds having at least two --CH.sub.2 X radicals where X is hydroxyl, chlorine or bromine.