Abstract: A preferred test system includes a chemical and/or biological sample in a liquid test medium and contains both a liquid and a gas phase that simulates air-water gas exchanges. It operates intermittently, with additions and eliminations of liquids being decoupled in time so that to make sure the medium is well mixed before eliminating any liquid; requirement for expensive fixed flow pumps, or accurate flow meters are eliminated while accurate measurement of fluxes between the chemical and/or biological sample, the liquid and the gas phase are possible by mass balance between added and eliminated liquids.

Abstract: Optical scanning device for the production of a 2D computer image of a liquid or humid biological sample observed by transparency, wherein an even thickness of the liquid biological sample is disposed in a tank optically enclosed between an illumination assembly and an optical sensing assembly, the optical sensing assembly having a moving part able to move in a plane parallel to the sample as to scan an area of the sample of sensibly equal thickness, the illumination assembly having a luminous source sensibly homogeneous at least in the scanned area and including towards the sample, an optical grid filter with a surface parallel to the plane and transmitting only light rays sensibly perpendicular to its surface. The sample can be observed by reflection. The tank is open and joint to the optical sensing assembly.

Abstract: Optical scanning device (1) for the production of a 2D computer image of a liquid or humid biological sample observed by transparency, wherein an even thickness of the liquid biological sample (30) is disposed in a tank (3) optically enclosed between an illumination assembly (2) and an optical sensing assembly (4), the optical sensing assembly having a moving part able to move in a plane parallel to the sample as to scan an area of the sample of sensibly equal thickness, the illumination assembly having a luminous source sensibly homogeneous at least in the scanned area and including towards the sample, an optical grid filter (25) with a surface parallel to the plane and transmitting only light rays sensibly perpendicular to its surface. the sample can be observed by reflection. The tank is open and joint to the optical sensing assembly. The illumination assembly and the optical sensing assembly can be tilted in relation to preparation, scanning and flushing operational phases.