Abstract: For the quantitative selective removal or/and preparative isolation of tumour necrosis factor (TNF) or/and lipopolysaccharides from aqueous liquids, in particular blood, plasma or serum, the aqueous liquid is passed over an adsorption material which consists of a porous supporting material to which functional groups made of synthetic or/and semisynthetic or/and natural polyanion chains and namely in a linear or branched form, are covalently bound and if desired, the molecules chromatographically separated in this way are eluted from the adsorption material using a saline solution.

Abstract: A syringe for an injector utilizes a cylinder having a deformable wall portion in the outlet end. Excessive pressure within the syringe cylinder, or contact with the syringe piston at the end of its stroke distends the deformable wall portion of the cylinder, actuating a sensor which provides a signal.

Abstract: Improvement in a method for the fractionation and separation of proteins by dsorption on an organic gel and elution with a descending ammonium sulfate gradient, the improvement comprising treating a solution of the proteins with ammonium sulfate down to a concentration which is from 5 to 15% below the concentration normally required for protein precipitation, mixing the solution obtained with unsubstituted agarose gel, whereby the protein is precipitated onto the agarose gel, and then fractionally eluting the latter, preferably with a linearly descending gradient.