Abstract: A modified test tube is provided which can sit on any flat surface unaided by a test tube rack. The modified test tube includes a tubular containment portion and tubular neck portion. The containment portion has a flattened bottom surface and a closed end. The neck portion is angled approximately 45.degree. relative to the flattened surface and has a mouth which opens parallel to the flattened bottom surface. The flattened bottom surface of the modified test tube enables the test tube to sit prone on any flat surface by itself, unaided by a rack, and the bent neck portion prevents the contents from spilling from the test tube. This design enables the contents within the test tube to be easily monitored without moving the test tube. A test tube rack is further provided for storing the test tubes.

Abstract: A modified test tube is provided which can sit on any flat surface unaided by a test tube rack. The modified test tube includes a tubular containment portion and tubular neck portion. The containment portion has a bottom surface preferably provided with a plurality of legs and a closed end. The neck portion is angled approximately 45.degree. relative to the flattened surface and has a mouth which opens parallel to the flattened bottom surface. The legs enable the test tube to sit prone on any flat surface by itself, unaided by a rack, and the bent neck portion prevents the contents from spilling from the test tube. This design enables the contents within the test tube to be easily monitored without moving the test tube. A test tube rack is further provided for storing the test tubes. The test tube rack is generally a rectangular member having a plurality of cavities, spaced such that each does not intersect another.

Abstract: A bone marrow biopsy needle assembly for obtaining a bone marrow core biopsy and a bone marrow aspirate biopsy in a single procedure includes an outer aspiration sheath which closely surrounds a coaxial inner hollow coring needle, and a trocar which extends through the coring needle. A handle arrangement is provided to allow insertion into the bone of the central trocar, the core biopsy needle and the outer aspiration sheath as an assembly, and to further allow stable manipulation of each component of the system without displacing the outer aspiration sheath. After insertion of the combined system through the cortical bone layer, the trocar is withdrawn. Further pushing and, if desired, twisting of the remaining assembly forces a bone marrow core biopsy into the inner, coring needle. The coring needle is then withdrawn and the bone marrow core biopsy is pushed out in a retrograde manner.

Abstract: Apparatus for measurement of gases in a multiple component gas stream or sample is disclosed. A regulated pressure system delivers the gas to N thermal conductivity type detectors utilizing wheatstone bridges. The thermal conductivity detector utilizes a resistance heated element (one leg of the bridge) which heats a chamber, and the sample flow varies the heat by thermal conduction in the chamber. The circuit creates a feedback signal for purposes of stabilizing the temperature in the chamber at a specified level. As the feedback signal is varied as a result of the change in concentration in the sample flow, this change in feedback signal is a signal which is related to the input.