156results about How to "Selectivity" patented technology

The present invention provides modified molecular sieve membranes with improved CO₂/CH₄ separation selectivity and methods for making such membranes. The molecular sieve membranes are modified by adsorption of a modifying agent, such as ammonia, within and/or on the membrane.

A method and device for treatment of living cells with cold atmospheric pressure plasma while simultaneously applying selective electroporation of the cells are provided. The method is useful for the local selective killing of cancer cells, improvement of wound treatment and sterilization or decontamination of objects.

The present invention discloses an approach for making mixed matrix membranes (MMMs) and methods for using these membranes. These MMMs contain a continuous polymer matrix and dispersed microporous molecular sieve particles. In particular, the present invention is directed to make asymmetric thin-film composite MMMs by coating a thin layer of molecular sieve/polymer mixed matrix solution on top of a porous support substrate followed by controlling the formation of a thin dense selective mixed matrix layer equal or larger in thickness than any of said molecular sieve particles. The MMMs of the present invention are suitable for a variety of liquid, gas, and vapor separations. The MMMs of the present invention have at least 20% increase in selectivity for these separations compared to the polymer membranes prepared from their corresponding continuous polymer matrices.

A nonporous metal carbonate membrane for selective separation of CO₂ from a CO₂-containing fluid having a porous substrate having a feed side and a permeate side. The membrane is also suitable for removal of H₂S that may be present in the fluid.

The present invention discloses high performance UV cross-linked polymer functionalized molecular sieve/polymer mixed matrix membranes (MMMs) with either no macrovoids or voids of less than several angstroms at the interface of the polymer matrix and the molecular sieves. These UV cross-linked MMMs were prepared by incorporating polyethersulfone (PES) functionalized molecular sieves such as AlPO-14 and UZM-25 small pore microporous molecular sieves into a continuous UV cross-linkable polyimide polymer matrix followed by UV cross-linking. The UV cross-linked MMMs in the form of symmetric dense film, asymmetric flat sheet membrane, or asymmetric hollow fiber membranes have good flexibility, high mechanical strength, and exhibit significantly enhanced selectivity and permeability over polymer membranes made from corresponding continuous polyimide polymer matrices for carbon dioxide/methane and hydrogen/methane separations. The MMMs of the present invention are suitable for a variety of liquid, gas, and vapor separations.

The present invention discloses a method for making mixed matrix membranes (MMMs) and methods for using these membranes. These MMMs contain a continuous polymer matrix and dispersed microporous molecular sieve particles. This invention also pertains to control the thickness of the thin dense selective mixed matrix layer equal to or greater than the particle size of the largest molecular sieve particles for making large scale asymmetric MMMs. In particular, the invention is directed to make asymmetric hollow fiber MMM by a phase inversion technique. The MMMs of the present invention exhibit at least 20% increase in selectivity compared to the polymer membranes prepared from their corresponding continuous polymer matrices. The MMMs of the present invention are suitable for a variety of liquid, gas, and vapor separations.

The present invention discloses mixed matrix membranes (MMMs) comprising a polymer matrix and molecular sieve particles and methods for making and using these membranes. The molecular sieve particles contain micropores or mesopores and exhibit a thin plate morphology with high aspect ratio and the plate thickness no more than 300 nm. This invention also pertains to controlling the alignment of the thin plate molecular sieve particles in the continuous polymer matrix of the thin dense selective layer of the asymmetric mixed matrix membranes. These MMMs exhibited much higher selectivity improvement than those comprising molecular sieve particles with other kinds of morphology for gas separations such as CO₂/CH₄ and H₂/CH₄ separations. The thin plate morphology of molecular sieves is beneficial to make high performance mixed matrix membranes. The MMMs are suitable for a variety of liquid, gas, and vapor separations

The present invention discloses methods of separating gases using high performance UV cross-linked polymer functionalized molecular sieve/polymer mixed matrix membranes (MMMs) with either no macrovoids or voids of less than several angstroms at the interface of the polymer matrix and the molecular sieves. These UV cross-linked MMMs were prepared by incorporating polyethersulfone (PES) functionalized molecular sieves such as AIPO-14 and UZM-25 small pore microporous molecular sieves into a continuous UV cross-linkable polyimide polymer matrix followed by UV cross-linking. The UV cross-linked MMMs in the form of symmetric dense film, asymmetric flat sheet membrane, or asymmetric hollow fiber membranes have good flexibility, high mechanical strength, and exhibit significantly enhanced selectivity and permeability over polymer membranes made from corresponding continuous polyimide polymer matrices for carbon dioxide/methane and hydrogen/methane separations. The MMMs of the present invention are suitable for a variety of liquid, gas, and vapor separations.

Methods and systems for controlling a wind turbine in a manner that takes into account the degree of loading of and damage to one or more components of the turbine are provided. An operational load on a wind turbine part is determined, and is used to compute a damage signal. The damage signal is indicative of the potential damage to the component or to the turbine as a whole that will result if action is not taken to reduce or mitigate the determined load. When the damage signal exceeds a pre-determined threshold, load-reducing wind turbine control means are activated to obviate the estimated damage.

The present invention discloses a method using 1,4-dihydroxy-9,10-anthraquinone thiosemicarbazone compound as a fluorescent probe to detect copper ions, and belongs to the technical field of optical analysis detection. The recognition effect of the 1,4-dihydroxy-9,10-anthraquinone thiosemicarbazone compound and various metal ions is investigated and studied experimentally, a good copper ion selective recognition effect of probe molecule ESN is found, due to the solubility of hydroxyl and water, the probe molecule can achieve the fluorescence identification of the copper ions in an aqueous solution, a better result can be achieved under physiological pH condition, the method is green, specific in copper ion selectivity and relatively high in sensitivity, and can play fluorescence quenching role in short reaction time, and the probe molecule can be successfully applied to the detection of the copper ions in biological living cells.

The present invention provides a methanation catalyst prepared by depositing Pt and Ru on a metal oxide carrier by incipient wetness impregnation or precipitation deposition, drying and calcining the deposited carrier to obtain a Pt—Ru/metal oxide catalyst. This catalyst can selectively catalyze methanation of CO, wherein hydrogen and CO in a hydrogen-rich reformate or synthesis gas are reacted to form methane and water, thereby the CO concentration in the hydrogen-rich reformate is reduced.

The present invention discloses an approach for making mixed matrix membranes (MMMS) and methods for using these membranes. These MMMs contain a continuous polymer matrix and dispersed microporous molecular sieve particles. This invention also pertains to control of the thickness of the thin dense selective mixed matrix membrane layer that is equal to or greater than the particle size of the largest molecular sieve particles for making large scale asymmetric MMMs. In particular, the invention is directed to making asymmetric flat sheet MMM by a phase inversion technique. The MMMs of the present invention exhibit at least 20% increase in selectivity compared to the polymer membranes prepared from their corresponding continuous polymer matrices. The MMMs of the present invention are suitable for a variety of liquid, gas, and vapor separations.

The present invention features a device for treating liquid including a containment member comprised of rigid porous polymer configured to form a containment space. Nonbonded particulate media is disposed in the space in contact with and contained by the containment member. Pores in the containment member are characterized by pore paths and pore sizes effective to permit flow of liquid through the pores while preventing the media from traveling through the pores. The containment member may be in various shapes and include different numbers of components. One variation of the containment member includes first and second containment layers comprised of the rigid porous polymer, which are configured and arranged so as to form a space therebetween in which the media is contained. Another variation of the containment member includes first and second porous polymer tubes forming a space in which the media is contained. Also featured is a method of using the device. Another aspect of the invention is a system that includes the device and a pH adjuster device that may function as an acidifier or basifier, which improves the performance of the liquid treatment device in removing substances from liquids by raising or lowering the pH of the influent traveling through the media of the liquid treatment device.

The invention discloses a magnetic dual-template protein molecule imprinted nano particle and a preparation method thereof. The surface amino-functionalization superparamagnetic nano particle is used as a carrier, and two types of protein are used as template molecules; the template molecules are fixed on the surface of the magnetic carrier; the polymer is formed under the effect of 3-aminopropyl triethoxysilane and octyltrimethylsilicane; then the template molecule in the polymer is washed out to obtain the magnetic dual-template protein molecule imprinted nano particle. The magnetic dual-template protein molecule imprinted nano particle prepared through the method is low in material cost, simple to prepare, rapid to separate, and various abundant protein constituents in complex biological systems are simultaneously, effectively and selectively removed and enriched more easily.

The present invention provides antisense phosphorodiamidate morpholino oligomers which are useful for the suppression or inhibition of the HTT gene involved in Huntington's disease. The oligomers can selectively suppress mutant forms of the HTT protein while allowing the normal protein to be expressed in sufficient quantity to retain its function in the cell. Methods for treatment of Huntington's disease are also provided.

The invention relates to an activity enhanced ketoreductase mutant, which is derived from wild-type ketoreductase of Candida magnoliae, can transform 4-chloroacetoacetic acid ethyl ester into (S)-4-chloro-3-hydroxy butyric acid ethyl ester, and has one or more mutations of E9R, S42Q, T190L and E234M. The ketoreductase mutant provided by the invention has obvious high specific enzyme activity, which is increased by 2-20 times than wild-type ketoreductase. According to the invention, the reaction conditions are mild, the requirement for equipment is low, the production process has need for high temperature or cooling, the energy consumption is low, and as enzyme catalysis has high efficiency and specific selectivity, production of the statin drug key intermediate (S)-4-chloro-3-hydroxy butyric acid ethyl ester by the method generates no by-product, and purification can be convenient. In addition, most solvents involved in the reaction of the invention are water, thus having low discharge of three wastes, and being green and environment-friendly.

An enzymatic process for preparing aliphatic polycarbonates via terpolymerization or transesterification using a dialkyl carbonate, an aliphatic diester, and an aliphatic diol or triol reactant. A catalyst having an enzyme capable of catalyzing an ester hydrolysis reaction in an aqueous environment is subsequently added to the reaction mixture. Next, polymerization of the reaction proceeds for an allotted time at a temperature≦100° C. Finally, the copolymer is isolated from an the catalyst via filtration.

The invention relates to a ketoreductase mutant deriving from wild type ketoreductase of lactobacillus kefir. The ketoreductase mutant is capable of converting ethyl-4-chloroacetoacetate to generate (S)-4-chloro-3-hydroxy ethyl butyrate and has one or multiple of mutations in A94S, F147V, L199P and A202V. The ketoreductase mutant provided by the invention has obvious high specific enzyme activity which is improved by 2-20 times in comparison with the wild type ketoreductase; the enzyme can be used for biologically catalyzing to convert the ethyl-4-chloroacetoacetate to generate (S)-4-chloro-3-hydroxy ethyl butyrate; the reaction condition is mild, and the requirement on equipment is low, the production process is free from high temperature or cooling, and the energy consumption is low; since the enzyme catalysis is efficient and unique in selectivity, the method can be used for producing statins key intermediate (S)-4-chloro-3-hydroxy ethyl butyrate without producing byproduct, and the purification is convenient; in addition, the vast majority solvent in the reaction is water, the three-waste emission is low, and the ketoreductase mutant is environmental friendly.

The invention discloses a ratio-type two-photon formaldehyde fluorescent probe, a preparation method therefor and use of the ratio-type two-photon formaldehyde fluorescent probe. The ratio-type two-photon formaldehyde fluorescent probe has a structure as follows shown in the description. Molecules of the fluorescent probe disclosed by the invention show relatively high selectivity and sensitivity to formaldehyde in a coexisting system of molecules of the formaldehyde and other aldehydes, amino acids and the like. Proven by cytotoxicity tests, the molecules of the fluorescent probe disclosed by the invention are almost free of toxic action on cells; and shown by two-photon fluorescence microscopy imaging experiments, the molecules of the fluorescent probe disclosed by the invention have good cell permeability to MCF-7 cells, so that the fluorescent probe is applicable to the detection of presence of formaldehyde molecules in the cells.

The invention discloses a two-channel two-photon fluorescent polar probe, a preparation method and uses thereof, wherein the structure of the two-channel two-photon fluorescent polar probe is definedin the specification. According to the present invention, the two-channel two-photon fluorescent polar probe has specific response to polarity in a system containing the probe and other interference factors; and the cytotoxicity test results show that the probe has almost no toxic side effects on cells, and the two-photon confocal fluorescence microscopy imaging experiment results show that the probe has good permeability to HeLa cells and can effectively locate the mitochondria in the cells (positioning coefficient of 0.95), such that the probe is suitable for the two-channel two-photon fluorescence imaging and quantitative detection of the polarity in cell mitochondrial.

A terminal-selective card connector includes a housing, a slide plate, a spring, a slide hood, and an injecting/ejecting device. At least two groups of terminals are mounted inside the housing. The slide plate is longitudinally slidably mounted at an internal lower side of the housing, having a plurality of elongated slots and a first action point located at a rear end thereof. The second group of terminals runs through bottom sides and then top sides of the elongated slots. The spring is mounted inside the housing for keeping forward movement of the slide plate. The slide hood has a second action point and a stopping portion for contacting against an inserted predetermined card. The injecting/ejecting device is mounted inside the housing for working on the slide hood. Thus, selectivity of the terminals is effected to enable different actions while different cards are inserted.

The present invention relates to a process for the preparation of esters of hydroxy tiglic aldehydes which are the key intermediates for Vitamin-A acetate synthesis and various perfumistic products, said process relates to the hydroformylation of biscarboxylic esters of but-2-ene-1,4-diol, followed by deacetoxylation of its hydroformylation compound, in the presence of heterogeneous catalyst having rhodium complex entrapped, anchored or teethered on the acidic support, said acidic support causes deacetoxylation in the reaction mixture immediately after hydroformylation, to give 100% selectivity to the carboxylic esters of hydroxyl tiglic aldehydes in a single step.