Abstract: A simplified, user-friendly method and apparatus for collecting and storing a human breath sample and for detecting and indicating whether the stored breath sample is a true alveolar sample. The invention includes in one embodiment thereof a preferably transparent container and a breath delivery device for directing a subject's breath into the container. A closure device is provided for accommodating the insertion of the breath delivery device into the container and for substantially sealing the container. A detector is provided for being positioned within the sealed container for detecting and indicating to an observer whether the breath sample stored in the container is a true alveolar sample.

Abstract: A simplified, user-friendly method and apparatus for producing and collecting a human breath sample, and particularly alveolar air, for analysis of the constituent components thereof. The invention includes an elongated, hollow container and a breath delivery device for directing a subject's breath into the container. Closure means are provided for accommodating the insertion of the breath delivery device into the container and for substantially sealing the container. In one preferred embodiment, the closure means includes a flexible sealing element which allows the insertion and withdrawal of the breath delivery device and which forms a light interim seal at the opening of the hollow container while the opening is being positively sealed by the user. The volume of the container is small in comparison to the normal human breath which has the effect of purging the container of the initial breath portion and leaving primarily only the alveolar air.

Abstract: A simplified, user-friendly method and apparatus for producing and collecting a human breath sample, and particularly alveolar air, for analysis of the constituent components thereof. The invention includes an elongated, hollow container and a breath delivery device for directing a subject's breath into the container. A closure device is provided for accommodating the insertion of the breath delivery device into the container and for substantially sealing the container. The volume of the container is small in comparison to the normal human breath which has the effect of purging the container of the initial breath portion and leaving primarily only the alveolar air.

Abstract: An apparatus is disclosed for the controlled production of microorganisms by photosynthesis in a closed photobioreactor. The closed photobioreactor contain a photosynthetic culture in a substantially sealed environment and provides a system for recirculating the reactant gas through the culture. This closed loop system can be operated with expensive carbon isotopes (i.e., .sup.13 CO.sub.2 or .sup.14 CO.sub.2). Also, a system is provided for removing the molecular oxygen produced in the photosynthesis reaction from the closed photobioreactor. Furthermore, a pH-regulated control valve is utilized for controlling the addition of reactant gas to the culture in response to the alkalization of the culture.

Abstract: A biochemical device and method for the determination of dissolved gases in solution is provided which employs a dry electrode/sample interface. Dissolved oxygen or other gas concentration in a liquid sample is measured by its diffusion through a selectively permeable membrane which is an integral part of a disposable receptacle. The receptacle makes contact with a gas-sensing electrode at the locus of the selectively permeable membrane whereby the determination of the concentration of said gas is made by the electrode without ever touching the liquid sample.

Abstract: A Factor IX preparation is separated from plasma by selective adsorption of Factors II, IX and X to the substantial exclusion of Factors VII and VIII with 0.025-0.1% by weight of a water-insoluble, cross-linked polyelectrolyte copolymer of ethylene and maleic anhydride containing pendant diloweralkylaminoloweralkyl functional groups.

Abstract: The propagation and/or maintenance of living cells in vitro is accomplished by attaching and growing cells on one side or surface of a hollow fiber membrane. The attached cells are propagated and/or maintained by passing oxygen through the membrane from the other side and into contact with the cells and simultaneously incubating the cells in a nutrient medium. This method is employed in tissue and cell culturing of altered and unaltered cells which attach to a surface for maintenance and growth.