1424 results about "Malonic acid" patented technology

Organisms are provided which express enzymes such as glycerol dehydratase, diol dehydratase, acyl-CoA transferase, acyl-CoA synthetase β-ketothiolase, acetoacetyl-CoA reductase, PHA synthase, glycerol-3-phosphate dehydrogenase and glycerol-3-phosphatase, which are useful for the production of PHAs. In some cases one or more of these genes are native to the host organism and the remainder are provided from transgenes. These organisms produce poly (3-hydroxyalkanoate) homopolymers or co-polymers incorporating 3-hydroxypropionate or 3-hydroxyvalerate monomers wherein the 3-hydroxypropionate and 3-hydroxyvalreate units are derived from the enzyme catalysed conversion of diols. Suitable diols that can be used include 1,2-propanediol, 1,3 propanediol and glycerol. Biochemical pathways for obtaining the glycerol from normal cellular metabolites are also described. The PHA polymers are readily recovered and industrially useful as polymers or as starting materials for a range of chemical intermediates including 1,3-propanediol, 3-hydroxypropionaldehyde, acrylics, malonic acid, esters and amines.

Described are methods of reducing the amount of byproduct organic acids during fermentation of an organism, based on expression of a heterologous malonyl-CoA synthetase. A polyunsaturated fatty acid [“PUFA”]-producing strain of the oleaginous yeast Yarrowia lipolytica was engineered to express a heterologous malonyl-CoA synthetase gene. The expression did not effect the production of PUFAs, but did result in a reduced amount of malonates when compared to the amount of malonates produced in the parental strain not expressing malonyl-CoA synthetase.

There is provided an aqueous dispersion for CMP with an excellent balance between chemical etching and mechanical polishing performance. The aqueous dispersion for CMP of the invention is characterized by comprising an abrasive, water and a heteropolyacid. Another aqueous dispersion for CMP according to the invention is characterized by comprising an abrasive, water, a heteropolyacid and an organic acid. Yet another aqueous dispersion for CMP according to the invention is characterized by comprising colloidal silica with a primary particle size of 5-100 nm, water and a heteropolyacid. Preferred for the heteropolyacid is at least one type selected from among silicomolybdic acid, phosphorotungstic acid, silicotungstic acid, phosphoromolybdic acid and silicotungstomolybdic acid. Preferred for the organic acid is at least one selected from among oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, fumaric acid, phthalic acid, malic acid, tartaric acid and citric acid.

The present invention discloses trivalent chromium color zinc coating passivator for passivation at normal temperature and its preparation process. The trivalent chromium color zinc coating passivator includes Cr3+ 1-7.5g/L, molybdate 1-25g/L, cobalt sulfate 5-15, ammonium bifluoride 1-8g/L, malonic acid 1-12g/L, phosphate 1-12 g/L, and silicate 0.2-6g/L. The trivalent chromium color zinc coating passivator solution has pH 1.8-2.3 regulated with sodium carbonate or nitric acid, passivating temperature of 20-35deg.c, passivating time of 30-60 sec and stoving temperature of 70-80deg.c. The present invention has the advantages of being practical and good use effect.

Collagen and hyaluronic acid or its sodium salt as main material are prepared into double layer composite material with compact layer and loose layer. The mass composition of the compact layer includes malonic acid swelling solution in 0.6-0.8 wt%; and the mass composition of the loose layer includes malonic acid swelling solution in 0.2-0.4 wt% and hyaluronic acid or its sodium salt in 5-20 wt% of dry collagen. The present invention has loose structure in one side and compact structure in the other side, and thus excellent biocompatibility capable of resisting the growth of fibroblast and other cell to the damaged part while promoting the regeneration and repairing of tissue in the damaged part. The double layer composite material has corresponding biodegrading function and may be degraded and absorbed without needing secondary operation to take out the implanted material. The present invention is suitable for repairing tissue damage.

An improved hard surface cleaning composition having an acidic pH having good soap scum stain removal capabilities. The composition of the present invention comprises: an acidic component comprising citric acid alone or in combination with citric acid selected from the group consisting of sorbic acid, acetic acid, boric acid, formic acid, maleic acid, adipic acid, lactic acid, hydroxysuccinic acid, malonic acid , glycolic acid, and mixtures thereof; at least one anionic surfactant; at least one thickener; at least one scrubbing agent; one or more optional components; Water; wherein, the pH value of the aqueous hard surface cleaning composition is less than or equal to 6.0.

A semiconductor wafer cleaning formulation for use in post plasma ashing semiconductor fabrication comprising at least one organic chelating agent and at least one polar solvent, wherein the chelating agent and polar solvent are in sufficient amounts to effectively remove inorganic compound residue from a semiconductor wafer. Preferably, the chelating agent is selected from the group consisting of 2,4-Pentanedione, Malonic acid, Oxalic acid, p-Toluenesulfonic acid, and Trifluoroacetic acid; and the polar solvent is selected from the group consisting of Water, Ethylene glycol, N-Methylpyrrolidone (NMP), Gamma butyrolactone (BLO), Cyclohexylpyrrolidone (CHP), Sulfolane, 1,4-Butanediol, and Butyl carbitol.

The invention relates to a high corrosion resistant trivalent chromium pearl opal passivating agent and a preparation method of the high corrosion resistant trivalent chromium pearl opal passivating agent. The invention belongs to the metal surface treatment technical field. The passivating agent comprises a Cr³⁺ chemical compound which contains 2 to 6 g/L chromium, 5 to 8 g/L malonic acid, a Co²⁺ chemical compound which contains 0.5 to 1 g/L cobalt, 1 to 3 g/L ammonium acid fluoride, 1 to 2 g/L sodium hydroxide, 1.5 to 3 g/L NO₃^-, 0.5 to 1 g/L formic acid, a low nanometer dimension acid silicasol which contains 0.4 to 2 g/L SiO₂, and the rest being water. The preparation method of the passivating agent is that the Cr³⁺ chemical compound, the malonic acid, the ammonium acid fluoride, and the Co²⁺ chemical compound are heated up and reacted under 70 DEG C to 100 DEG C. When the temperature is from 20 DEGC to 30 DEGC, the NO₃^- is added. The formic acid and low nanometer dimension acid silicasol are added. Adding water to constant volume, the passivating agent is obtained. The passivating agent of the invention has the advantages that no hexavalent chrome is contained, and the production process has no hexavalent chrome pollution. When passivating, the passivating agent facilitates forming a uniform and dense passivation layer. And the corrosion resistance of the passivation layer is greatly promoted.

Embodiments described herein provide methods for forming indium-gallium-zinc oxide (IGZO) devices. A substrate is provided. An IGZO layer is formed above the substrate. A copper-containing layer is formed above the IGZO layer. A wet etch process is performed on the copper-containing layer to form a source region and a drain region above the IGZO layer. The performing of the wet etch process on the copper-containing layer includes exposing the copper-containing layer to an etching solution including a peroxide compound and one of citric acid, formic acid, malonic acid, lactic acid, etidronic acid, phosphonic acid, or a combination thereof.

The invention relates to porous carbon with high-volumetric-specific-capacitance composite graphene, a preparation method thereof, and an application thereof. The porous carbon comprises the raw materials of graphene oxide, hydroxyl-containing phenols and derivatives thereof (phenol, resorcinol, phloroglucin, p-hydroxybenzoic acid, or 2,4-dihydroxybenzoic acid), and aldehydes (formaldehyde, butyraldehyde, or terephthalaldehyde). A carboxyl-containing compound (amphoteric compound amino acid, malonic acid, or oxalic acid) is used for regulating the pH value of the system and for initiating a phenolic condensation polymerization reaction, such that a sandwich structure with nano-sheets embedded in a polymer is prepared. The structure is subjected to carbonization, and the porous carbon is prepared with a one-step method. The prepared porous carbon with the sandwich structure is advantaged in novel structure, simple preparation technology, high product purity, convenient application, and suitability for large-scale productions. The porous carbon shows a mass specific capacitance similar to that of a graphene-based material in the application in a super-capacitor. Also, the volumetric specific capacitance of the porous carbon is higher by a magnitude than that of the graphene-based material. Therefore, the porous carbon has great application potential and market prospect.

The invention relates to an antibacterial biological activity stent and a preparation method thereof. The method comprises the steps that gelatin microspheres are prepared; porous gelatin microspheres are prepared; gelatin microspheres carried with active factors are obtained; an antibacterial stent is prepared, wherein the preparation of the antibacterial stent comprises the steps that at least one of collagen, chitosan and silk fibroin and nano-silver grains are added to acetic acid or malonic acid to prepare a mixed solution, the mixed solution is poured into a die which is horizontally paved with the solid gelatin microspheres, the die is rapidly placed in an ultra cold refrigerator for freezing treatment, and the die is frozen and dried to obtain the antibacterial stent; and the antibacterial biological activity stent is prepared by the steps that the gelatin microspheres carried with the active factors are placed into normal saline to prepare a suspension liquid, and the suspension liquid is poured into the antibacterial stent to obtain the antibacterial biological activity stent after dried at the room temperature. According to the antibacterial biological activity stent and the preparation method thereof, pure natural polymers are taken as raw materials, the nano-silver grains and the bioactive factors are compounded to prepare the stent, so that the stent has the biological activity and antibacterial capacity, can effectively promote vascularization of cambium and can be used for skin injury healing.

A polishing composition includes fumed alumina, alumina other than fumed alumina, colloidal silica, a first organic acid, a second organic acid, an oxidizing agent, and water. When the second organic acid is citric acid, the first organic acid is preferably malic acid, while when the second organic acid is malic acid, the first organic acid is preferably citric acid. When the second organic acid is succinic acid, iminodiacetic acid, itaconic acid, maleic acid, malonic acid, crotonic acid, gluconic acid, glycolic acid, lactic acid, or mandelic acid, the first organic acid is preferably either citric acid or malic acid. The polishing composition can be suitably used for polishing the surface of a substrate for a magnetic disk.

Disclosed is a 700V high-voltage aluminum electrolytic capacitor electrolyte. The electrolyte comprises 50-80% of main solvent, 20-50% of auxiliary solvent, 5-20% of main solute, 2-10% of auxiliary solute, 0.1-1% of auxiliary additive and 5-15% of spark additive, wherein the main solute comprises one or more of azelaic acid, ammonium hydrogen azelate, ammonium sebacate, decane dicarboxylic acid, 7, 9-dimethyl-7, 9-dimethoxy carbonyl-1, 11-dodecane dicarboxylic acid, and 7, 8-dimethyl-7, 8-dimethoxy carbonyl-1, 14 tetradecane dicarboxylic acid; and the auxiliary solvent comprises one or more of ammonium salicylate, salicylic acid, oxalic acid, malonic acid, succinic acid, ammonium benzoate, ammonium maleate, ammonium hydrogen maleate, ammonium adipate and hexanedioic acid. The spark voltage of the electrolyte is greater than 700V; and in addition, the electrolyte is simple to prepare, stable in performance and excellent in related parameters.

The invention discloses a preparation method 2,4,5-trifluorophenylacetic acid. The method is characterized by consisting of four reaction steps of: A, reaction of 2,4,5-trifluoronitrobenzene (I) and diethyl malonate which are condensed to prepare 2,5-difloro-4-nitrobenzophenone diethyl malonate; B, hydrolysis, acidification and decarboxylic reaction of dibasic ester; C, reduction reaction of nitryl; and D, diazotization fluoridation of amino. The four reaction steps can be sequentially carried out according to A, B, C and D, or A, C, B and D, or A, C, D and B. According to the preparation method provided by the invention, condensation of 2,4,5-trifluoronitrobenzene (I) and diethyl malonate is easy to realize by means of high substituting activity of nitryl p-fluorine, and the raw material 2,4,5-trifluoronitrobenzene (I) is low in cost and easy to obtain and can be easily prepared by nitration and fluorination of 2,4-dichlor fluorbenzene. Compared with the prior art, the preparation method provided by the invention has the characteristics of low-cost and easily obtained raw materials, mild reaction condition, high total yield, low production cost and the like, and is comparatively suitable for industrialized production.

The invention relates to a prediction method of ammonia release amount in main stream smoke of flue-cured tobacco leaves. The method comprises the steps of subjecting tobacco leaves to be cured firstly to sample pre-processing such as manual piece tearing, stalk removing and tobacco cutting; detecting 8 chemical components (total nitrogen, rutin, chlorine, belladonna, linolenic acid, malonic acid, potassium and linoleic acid) of a sample to be detected; calculating network values of 7 nodes of a hidden layer according to the detection results of the 8 chemical components and coefficients of input layers of a model; converting the network values of the 7 nodes of the hidden layer to output values of the 7 nodes of the hidden layer; and calculating to obtain a predicted value of the ammonia release amount in the smoke according to the output values of the 7 nodes of the hidden layer and coefficients of output layers of the model. According to the method, the ammonia release amount in the smoke can be predicted through the model, and the possible ammonia accumulated content in cigarette finished products produced in future can be predicted effectively according to raw materials of the flue-cured tobacco leaves, so that raw material choosing in a producing process is guided.

The present invention provides a quantum dot having a ligand layer on a surface thereof, the ligand layer comprises a malonic acid derivative, a thiothiol compound, a thiocarboxylic acid compound, andmore than one of an ester group and sulfur alcohol group-based compounds. The quantum dot is excellent in oxidation stability, and can be effectively applied to various applications such as a quantumdot film, a color filter, and a quantum dot light-emitting diode.