Abstract: A laboratory apparatus for continuously producing high purity distilled water includes a distillation flask, a carboy and condenser unit. A double walled microwave oven with a spacing between the walls, large enough to accommodate piping and valving means for controlling the flow of water to the distillation flask. The microwave oven supplies the heat to the system.

Abstract: A laboratory stand assembly for use in emptying sample vials used to monitor the concentration of solvent vapor in air. The assembly consists of a base, a support extending vertically therefrom with a sample holder adjustably positioned in the support. A clamp is attached to the top of the sample holder to secure the adsorption tube to the sample holder. Support means for receiving a sample vial are also provided.

Abstract: An apparatus for preventing microorganisms from passing from outside into sterile closed systems containing sterile water or other fluids for general or biomedical use.

Abstract: An apparatus for preventing microorganisms from passing from outside into sterile closed systems containing sterile water or fluids for general or biomedical use wherein an ultraviolet light source is attached to the outlet valve, exposing it to an effective amount of ultraviolet light of a wavelength range of 2300A.degree. to 2900A.degree..

Abstract: An apparatus for the continuous production of high-purity water includes a distillation flask, a carboy and a condenser unit, all of borosilicate glass. A respective filter, preferably in the form of a polytetrafluoroethylene sheet, is provided between the ambient atmosphere and the interiors of the flask, the carboy and the condenser unit to remove airborne bacteria and dust particles. An inlet valve is provided for feeding water to be purified into the flask, all water-contacting parts of this valve being of polytetrafluoroethylene. The open parts are interconnected with flexible, polytetrafluoroethylene tubing. A two-way, stopcock allows high-purity water to be removed from the carboy. The flask is provided with a glass overflow trap. In one variant, the water is fed into the flask via members between the trap and the flask.

Abstract: A new convenient and more reliable spectrophotometric method for assaying endotoxins at levels as low as 1 to 5 ppb. Representative members of six different groups of endotoxins, Shigella, Serratia marcescens, Salmonella, Escherichia coli, Pseudomonas and Porteus. were examined and each exhibited an absorption maxium of 258 to 260 nm.

Abstract: A new convenient and more reliable spectrophotometric method for assaying endotoxins at levels as low as 10 ppb. Five different solutions of endotoxins, E. coli 0127:B8, E. coli 055:B5, S. abortus equi, S. enteritidis and S. flexneri were examined and each exhibited an absorption maximum of 259 mm.

Abstract: An apparatus for the continuous production of high-purity water includes a distillation flask, a carboy and a condenser unit, all of borosilicate glass. A respective filter is provided between the ambient atmosphere and the interiors of the flask, the carboy and the condenser unit to remove airborne bacteria and dust particles. An inlet valve is provided for feeding water to be purified into the flask, all water-contacting parts of this valve being of polytetrafluoroethylene. The open parts are interconnected with flexible, polytetrafluoroethylene tubing. A two-way, stopcock allows high-purity water to be removed from the carboy.