Abstract: The present invention concerns new cationic quaternary ammonium compounds which exhibit excellent adsorption properties on negatively charged surfaces. These ones can notably be obtained firstly by reacting an internal ketone with a twin-tail amine under reductive amination conditions to obtain a twin tail triamine, then subjecting the twin tail triamine to a quaternization reaction. They can also obtained be obtained by the quaternization reaction of a certain diamine.

Abstract: The present invention concerns new cationic quaternary ammonium compounds which exhibit excellent adsorption properties on negatively charged surfaces. These ones can notably be obtained firstly by reacting an internal ketone with a twin-tail amine under reductive amination conditions to obtain a twin tail triamine, then subjecting the twin tail triamine to a quaternization reaction. They can also obtained be obtained by the quaternization reaction of a certain diamine.

Abstract: The invention relates to a device for the actively-controlled deposition of microdrops of biological solutions. The inventive device includes at least one flat silicon lever comprising a central body and an end area which forms a point, a slit or groove being disposed in said point. The invention is characterized in that it also comprises at least one metallic track which is disposed on one face of the central body and which runs alongside said slit or groove at least partially. The invention also relates to a method of producing the inventive device and a method for the active-controlled deposition and sampling of microdrops of biological solutions using said device.

Abstract: Said method for predetermining at least one conversion parameter uses at least one transfer between a liquid phase and a gas phase, wherein: a gas phase is injected into a liquid phase so as to form a heterogeneous flow including a series of bubbles, formed from the gas phase, within the liquid phase; said heterogeneous flow is caused to occur within a flow member so as to carry out at least one transfer between the liquid and gas phases; the decrease in the volume of the bubbles is observed along said flow member; and said at least one parameter is derived therefrom.

Abstract: The aim of the invention is to improve the surface characterization of solid materials, facilitating the implementation thereof, while producing reliable and accurate results. The method of the invention comprises the following steps: obtaining a material (M) to be characterized, in powder form, and a gas mixture (G) containing a probe molecule (S) that can interact with the material, performing gas percolation through the material by flowing the gas mixture into the free spaces between the grains of the material, while leaving said grains in contact with each other, during the gas percolation through the material (M), measuring a radiative heat flux (F) emitted by the material, and at least one surface characteristic relating to the material (M) is deduced from the radiative heat flux (F) measurements.

Abstract: The invention relates to a device for the actively-controlled deposition of microdrops of biological solutions. The inventive device includes at least one flat silicon lever comprising a central body and an end area which forms a point, a slit or groove being disposed in said point. The invention is characterized in that it also comprises at least one metallic track which is disposed on one face of the central body and which runs alongside said slit or groove at least partially. The invention also relates to a method of producing the inventive device and a method for the active-controlled deposition and sampling of microdrops of biological solutions using said device.

Abstract: The invention relates to a device for the actively-controlled deposition of microdrops of biological solutions. The inventive device consists of at least one flat silicon lever comprising a central body and an end area which forms a point, a slit or groove being disposed in said point. The invention is characterized in that it also comprises at least one metallic track which is disposed on one face of the central body and which runs alongside said slit or groove at least partially. The invention also relates to a method of producing the inventive device and a method for the active-controlled deposition and sampling of microdrops of biological solutions using said device.

Abstract: A procedure for determining the flow rate of a fluid includes introducing a fluid into a flow member (6) in the form of a series of plugs (20) separated by segments (22) of a carrier phase, measuring the rate of movement of the plugs in the flow member, and determining therefrom the flow rate of the fluid (20, 22).

Abstract: A fluidic analysis device includes a small plate (2), at least one flow channel (4) formed in this plate, means (18) for directing a fluid into the flow channel, and at least two analytical means (28?, 28?, 361, 362 46) suitable for analyzing a sample of unique composition of said fluid.

Abstract: The invention relates to a device for the actively-controlled deposition of microdrops of biological solutions. The inventive device consists of at least one flat silicon lever comprising a central body and an end area which forms a point, a slit or groove being disposed in said point. The invention is characterized in that it also comprises at least one metallic track which is disposed on one face of the central body and which runs alongside said slit or groove at least partially. The invention also relates to a method of producing the inventive device and a method for the active-controlled deposition and sampling of microdrops of biological solutions using said device.