A method of determining the penicillin content in biological, metabolic, and alimentary substances by partially inactivating penicillinase with iodine in the presence of and in proportion to the amount of a penicillin contained in a specimen, and measuring the residual activity of the enzyme by contact with a suitable substrate such as an S-type penicillin in the presence of an indicator whose color change signifies accumulation of the hydrolyzate penicillinoic acid and is correlated in terms of...

A method of treating an aqueous biological slurry comprising the steps of feeding the slurry through an evaporator plant where it is subjected to heat treatment and where a part of its water content is removed by evaporation, filtering the slurry which has passed through the evaporation plant and recycling the aqueous filtrate for further treatment with the slurry in the evaporator plant and an installation for performing same.

A reliable leak-proof biological door seal for use with cabinets containing ighly infectious materials therein. The door is provided with a beaded resilient membrane which is stretched over a continuous U-shaped frame section describing the near peripheral portions of each side of the inside of the door which is contacted by mating seating flange integral the cabinet proper for maintaining the cabinet absolutely tight under positive or negative pressures.

A biological cell analyzing system which is capable of automatically categorizing unstained biological cells as normal or non-normal. The cells are made to flow through a transparent tube in single file and are scanned with a mixture of ultra-violet and visible light. The cytoplasm and nucleus of each cell absorb ultra-violet radiation to different degrees, and the emergent light signal, as modulated by the scanned cells, is detected, amplified, and extended to a data processor which logically a...

The present invention relates to a process for the disruption of biological material and to a device for this process. The device according to the invention comprises in combination a pressure vessel provided with inlet and outlet means, pressure regulating means connecting the pressure vessel with a container of a compressed gaseous medium and means for determining the pressure established in the pressure vessel.

Method and apparatus for substantially upgrading the operating efficiency of wastewater treatment plants is disclosed. The invention utilizes forcibly rotating bodies that are partially submerged in the wastewater to provide surface area on which biological slimes develop and serve the purpose of removing pollutants from the wastewater. The rotating, partially submerged bodies are located in the upper portion of the treatment tanks, and, in addition to providing oxygen and nutrients for the grow...

This disclosure describes apparatus for automatically processing special laboratory slides carrying specific antigenic material with samples of blood serum taken from patients to detect the presence of specific antibodies in the serum as an indication of previous exposure to the antigen. Specifically, the disclosure describes the apparatus as applied to the fluorescent treponemal antibody (FTA) test for syphilis using an indirect fluorescent antibody technique with T. pallidum (Nichols strain) a...

A sample of material such as blood, urine, spinal fluid, or the like to be tested for the presence of biological activity is placed into a sterile container together with a suitable growth medium which includes a C.sup.14 carbon containing carbon source (such as C.sup.14 substituted glucose) which is fermentable to produce gaseous C.sup.14 O.sub.2. An incubator is provided for exposing the container and its contents to conditions conducive to growth. After a suitable incubation period, a portion...

The invention relates to preparation of precise micro and other values of volumetric concentrations of chemicals, standards, reagents, pharmaceuticals and biologicals in solvents therefor and utilizes dry segments from an inert, integrally divisible and absorbent carrier uniformly impregnated with said substances, each of the segments carrying a computed quantity of the impregnation based on the proportionate size with respect to the carrier. One of the objects of the invention is in the prepara...

The biological reactor contains in a vessel (11) a bundle (13) of tubes (15). The bundle (13) is formed by a plurality of plastic tubes (15) being of preferably square cross-section. The walls of the plastic tubes serve as growth surfaces for microorganisms. A distributing device (17) feeds the different ducts (18) evenly with liquid organic refuse. The ducts (18) are not completely filled. The liquid level in the reactor is at a certain distance from the top of the tubes (15). Accordingly, if o...