Abstract: A cell perifusion chamber structure capable of continuously monitoring processes during polymerase chain reaction includes a cell chamber body having a support surface with an aperture defined through the support surface, and wall structure extending upwardly from the support surface to define an interior. The wall structure includes passages therein. A gasket is disposed on the support surface so as not to cover the aperture. A first transparent cover is disposed on the gasket so as to cover the aperture. A water bath body is provided and has a first portion and a second portion extending from the first portion. The first portion defines a second support surface. The second portion is received in the interior of the cell chamber body and is in interference fit arrangement with the wall structure. The water bath body has an interior support surface with an aperture therethrough. The aperture extends through the first and second portions.

Abstract: An improved micromethod for the quantitative determination of endotoxins with Limulus Amebocyte Lysate (L.A.L.) reagent is based on the discovery that if L.A.L. reagent and a sample containing microquantities of endotoxin are incubated in a capillary tube, a clot will be formed in the plug preventing any outflow of liquids when low hydrostatic pressure is applied. Increasing the pressure will eventually force out the clot plugging the capillary and the liquid will suddenly erupt giving a clear yes-no indication of the presence of endotoxin. The hydrostatic pressure indicated to cause this eruption is a relatively precise indication of the extent of clotting which, in turn, is indicative of the concentration of endotoxin in the liquid. A kit which can be used to perform this test is also disclosed.