44 results about "Sodium fluorescein" patented technology

Apparatus and method for measuring the fluorescence of nanodrop liquid samples is described in which the sample is held by surface tension between two anvil surfaces. Each anvil surface has an embedded optical fiber with its end finished flush with the surface in the containment area wetted by the sample with the fiber in line. Sample excitation is provided from the side of the sample remote from the containment area. By selection of the fiber transmission numeric aperture the impact of exciting and ambient light on the measurement is minimized. A method of virtual filtering is taught in which any ambient or exciting light that does impinge on the measuring sensor is corrected by subtracting a scaled representation of the source from the measurement. The method and apparatus is capable of detecting 1 femptomole of sodium fluorescein in 1 microliter of TE buffer.

The invention discloses a preparation method of modified graphene. The graphene oxide / water dispersion with a concentration of 0.01-3.0 mg / mL is configured; sodium fluorescein is added to the graphene oxide / water dispersion and stirred; and then added Alkaline solution to adjust the pH of the system to 9-10; add a chemical reducing agent, react at 60-95 degrees Celsius for 10-100 hours, and cool to room temperature; filter or centrifuge the system, and wash with ethanol and deionized water until nearly neutral Or neutral, dry to constant weight at 40-80 degrees Celsius to obtain modified graphene. The invention is beneficial to increase and improve the dispersibility of graphene in water and organic solvents, and the preparation method is simple, the conditions are mild, and the operation and control are easy.

The invention discloses an engine coolant and a preparing method thereof. The engine coolant is prepared from, by weight, 500-700 parts of water, 40-60 parts of sodium formate, 5-15 parts of borax, 0.2-1.5 parts of potassium molybdate, 0.5-1.5 parts of octanedioic acid, 1-10 parts of sodium caprate, 0.5-1.5 parts of sodium nitrate, 0.5-1.5 parts of benzotriazole, 1-3 parts of sodium hydroxide, 1-3 parts of sodium metasilicate nonahydrate, 200-400 parts of 1,2-propylene glycol, 50-100 parts of glycerine, 0.001-0.008 part of sodium fluorescein, 0.01-0.08 part of simethicone, 0.05-0.15 part of lanthanum chloride, 0.05-0.15 part of chelating agent and 0.1-0.5 part of silicate stabilizer. The engine coolant is high in stability, freezing resistance, rust resistance and scaling resistance, capable of avoiding pipeline blocking, effectively preventing corrosion to ferrous metal, tin, copper and copper alloy, aluminum and aluminum alloy, overcoming the technical defect of traditional water-containing cooling liquid that boiling occurs easily, facilitating full-load and high-load operation of an engine and ensuring that a vehicle can travel safely in severe environments such as highlands, deserts and cold areas, and especially suitable for military vehicles, high-end vehicles and high-power heavy-load trucks and passenger cars.

The invention provides a bacillus subtilis synergist and application thereof for preparing bacillus subtilis fungicide, and belongs to the technical field of microbial preparation. The bacillus subtilis synergist is prepared from, by mass, 0.5-1.5 parts of xanthan gum, 1-3 parts of sodium fluorescein, 1-3 parts of a fluorescent brightener CBS-X, 1-3 parts of butylated hydroxytoluene, 6-9 parts ofsaccharose and 2-3 parts of potassium nitrate, wherein the xanthan gum, the sodium fluorescein and the fluorescent brightener CBS-X can achieve the good anti-ultraviolet protection effect on bacillussubtilis; the butylated hydroxytoluene can achieve the good anti-oxidation effect on the bacillus subtilis; the saccharose and the potassium nitrate can achieve the obvious synergism on the bacteriostatic activity of the bacillus subtilis. The ingredients can have the good biologic compatibility with the bacillus subtilis.