Abstract: A device for transporting at least one cellular entity during culture or maturation, the device comprising a substrate having one or more wells, said one or more wells being adapted to hold a cellular entity in a fluid, lid means for preventing entry or exit of the cellular entity from the one or more wells and fluid transport means connecting the one or more wells to enable flow of fluid or diffusion of chemical species. The apparatus alternatively or in addition comprise a module for transporting a payload at a controlled temperature, the module comprising an outer housing, an outer thermally insulating region, an inner thermally insulating region, and a heat sinking region located between the inner and outer thermally insulating regions, the inner thermally insulating region defining a cavity for receiving a payload, and heating means.

Abstract: A gas sensor is described which is particularly well suited as a carbon monoxide (CO) sensor in a self test gas sensor. The sensor includes a number of aspects which may or may not be used in conjunction with one another. A first aspect is an embodiment which reduces electrical interference (or cross-talk) between a test or gas generating cell and a sensing cell. In one embodiment, baffles are provided to prevent cross-talk. In another embodiment a switching circuit ensures that a test gas generator is operational only when the gas sensor is disconnected from a current source. A second aspect is an embodiment which includes an improved wick which is in close proximity with an electrode and ensures electrolyte is always in contact with the electrode. In an alternate embodiment a solid polymer electrolyte is used between the electrodes. A third aspect is an improved catalyst which reduces the reaction energy and thereby renders the sensor more sensitive. The catalyst is also cheaper than platinum.