Abstract: A water-in-oil-in-water (W/O/W) emulsion to be used in an antigen delivery system to induce rapid and long-lasting immunity among populations of livestock, birds, and fish. The external aqueous phase of the W/O/W emulsion contains a thixotropic inorganic salt, such as aluminum hydroxide or alum. The presence of the inorganic salt helps to elicit both a Th1 and a Th2 response from the subject's immune system, and the thixotropic properties of the salt stabilize the water-in-oil-in-water emulsion, thereby providing a longer vaccine shelf life. The antigen dose to be delivered to the subject may be contained in entirely in the internal aqueous phase. Alternatively, a first portion of the total antigen dose may be included in the internal aqueous phase and a second portion is included in the external aqueous phase. The incorporation of a portion of the antigen in the external aqueous phase triggers a more uniform immune response across a vaccinated population.

Abstract: Irradiated or nonirradiated substantially pure .beta.-1,3-glucan polysaccharides, derivatives and coprocessed mixtures thereof with other hydrocolloids, methods for their preparation, and uses for the aqueous gels prepared from them, including their use in the electrophoresis of DNA, RNA, and their fragments.

Abstract: The invention provides an aqueous colloidal peroxygen composition comprising stable sols, gels and solids of C2 to C6 peroxycarboxylic acids with a polysaccharide gum, optionally with gum cross-linking agents such as boric acid, borate salts, urea and the like useful for delivering peracids in applications such as surface cleaners, detergent bleach, automatic dish washing formulations and the like. The compositions are particularly useful for sanitizing or bleaching at an acid or neutral pH compared with other chlorine or peroxygen bleach compounds.

Abstract: A nucleic acid sequencing gel comprising 2 to 10% of a gelling polysaccharide, preferably agarose; a denaturing agent, a non-gelling additive, preferably glycerol, and electrophoretic buffers. This composition is capable of resolving nucleic acid fragments having at least 50 bases and which differ from each other by at least one base.