A sample tray for containing one or more fluid samples is provided. Each sample is maintained in a separate elevated reservoir affixed to a base plate and each elevated reservoir is surrounded by a catch basin. A wall surrounds each catch basin so that the catch basins are distinct. The tray may have means for alignment of the test specimen reservoirs in cooperation with a utilization device.
The strengthening of a glass ophthalmic lens by ion exchange treatment does not alter the appearance of the lens sufficiently to render the presence or absence of such strengthening readily visually ascertainable even with the aid of a light polarizing strain detector. It being desirable to inspect for the presence or absence of strengthening by ion exchange treatment prior to dispensing glass lenses to the public, the present invention provides an auxiliary device for a light polarizing strain detector with which a lens to be inspected may be immersed in a liquid having approximately the same refractive index as the lens so that the strain detector can produce readily perceivable stress patterns in strengthened lenses.
A container for containing a liquid for use in a biochemical analysis includes a cylindrical inner side wall, a bottom wall connected to the inner side wall at its lower end and a cylindrical outer side wall surrounding concentrically the inner side wall and being separated from the inner side wall to form a ring-shaped recess therebetween. Even if the liquid overflows beyond the inner side wall, an outer surface of the outer side wall is kept free from the liquid and the operator's fingers are protected against contamination by the liquid.
A microculture tray comprising a plurality of pairs of wells, each pair of wells connected by a trough which extends downwardly approximately 2/3 of the depth of the well so that the wells in the pair are connected so as to allow free passage of supernatant but not of cells between the wells. The tray can be used for rapid testing of animal cells or non-motile microorganisms for the release of soluble mediators.
A crystallization tray includes a plurality of crystallization cells, each cell having a reservoir adapted to receive an equilibrating solution, a shelf located adjacent to the reservoir and adapted for use as a temporary cryogenic holding area for a crystallized substance and/or a sample holding area, and a sample drop receptacle carried by the shelf and adapted to receive a sample drop including a crystallizable substance. A related method for forming macromolecular crystals includes dispensing an equilibrating solution in the reservoirs, dispensing a plurality of macromolecular solution droplets in the sample drop receptacles, covering the cells with a cover; and crystallizing the crystallizable substance by vapor diffusion.
The vial is particularly designed to retrieve urine specimens from a jar or other container provided by a patient. The vial itself is in the form of a bellows biased to its expanded position. A straw is provided axially in the bellows such that the bellows can be manually collapsed and then released so that the specimen is sucked up through the straw into the bellows. The bellows itself has a bottom shaped to be received in a centrifuge and is also provided with a cap which replaces the straw prior to centrifuging. The cap itself can be removed after centrifuging and defines a fixed volume for collecting a given amount of sediment and liquid for ultimate analysis on a slide. The straw serves the dual function of axially supporting the bellows arrangement during collapsing by guiding the bellows walls and also as a conduit or passage for transferring urine into the bellows.
