2274 results about "Reactive site" patented technology

Described herein are compositions, silicon nitride films and methods for forming silicon nitride films using at least on cyclodisilazane precursor. In one aspect, there is provided a method of forming a silicon nitride film comprising the steps of: providing a substrate in a reactor; introducing into the reactor an at least one cyclodisilazane comprising a hydrocarbon leaving group and two Si—H groups wherein the at least one cyclodisilazane reacts on at least a portion of the surface of the substrate to provide a chemisorbed layer; purging the reactor with a purge gas; introducing a plasma comprising nitrogen and an inert gas into the reactor to react with at least a portion of the chemisorbed layer and provide at least one reactive site wherein the plasma is generated at a power density ranging from about 0.01 to about 1.5 W/cm².

The invention discloses a bulk hydrotreating catalyst and a preparation method thereof. The catalyst comprises three active metal components, namely Mo, W and Ni, and the sum of active metal oxides is 30 to 70 weight percent. In the method, a proper amount of water-soluble nitrogen-containing compound is added in the bulk catalyst gelatinating process, the pore structure of the catalyst is improved, more metal active sites are exposed on the surface of the catalyst, the utilization rate of active metals is improved, the catalyst has obviously high activity compared with the common bulk catalyst under the condition of the same metal content, and the consumption of the active metals for the common bulk catalyst can be reduced and the preparation cost of the catalyst can be reduced under thecondition of the equivalent activity. In addition, the bulk catalyst has increased pore diameter and pore volume, the Ni-W high active center is fully utilized, complicated macromolecules are easier to contact the active center, and the effect is particularly more obvious when the catalyst treats distillates with high macromolecule content.

The present invention is concerned with new compounds, and particularly those having a fused bicyclic ring substituted with an amidine moiety. These compounds are each potent inhibitors of Factor D of the alternate pathway of complement, C1s of the classical pathway of complement, Factors Xa, XIIa, VIIa and thrombin of the coagulation pathway, plasmin in the fibrinolytic pathway, and kallikrein and high molecular weight kininogen in the inflammatory pathways. These proteases, which have serine in their active site, are called serine proteases and they are pivotal to most of the processes of inflammation and coagulation. In fact, these various systems are interactive with one another and it is difficult to activate one pathway without it influencing the others.

Provided are methods for enhanced sequencing of nucleic acid templates. Also provided are reaction conditions that increase branching fractions during polymerization reactions. Also provided are compositions comprising modified recombinant polymerases that exhibit branching fractions that are higher than the branching fractions of the polymerases from which they were derived. Provided are compositions comprising modified recombinant polymerases that exhibit delayed translocation relative to the polymerases from which they were derived. Also provided are compositions comprising modified recombinant polymerases that exhibit increased nucleotide or nucleotide analog residence time at an active site of the polymerase. Provided are methods for generating polymerases with the aforementioned phenotypes and methods of using such polymerases to sequence a DNA template or make a DNA. Also provided are methods and nucleic acid sequencing systems for determining which labeled nucleotide is incorporated at a site during a template-dependent polymerization reaction.

The invention discloses a high-activity catalyst which catalyzing and activating carbon dioxide to perform the copolymerization reaction with alkylene oxide to synthesize polycarbonate. The catalyst is characterized in that the catalyst is a tetradentate schiff base complex contains one or two organic base groups and has single active site initiation and controllable polymerization. The catalyst has the advantages that under milder conditions and at lower concentration of the catalyst, the catalyst can highly and efficiently catalyze the carbon dioxide to make the copolymerization reaction with the alkylene oxide to prepare the polycarbonate, the catalytic efficiency is 10<6>g polymer/mol catalyst, the polymer molecular weight is adjusted in the range of between 5,000 and 500,000, the molecular weight distribution is less than 2, the alternating structure is over 97 percent, and the catalyst can be degraded into small molecule compounds under certain condition. By utilizing the catalyst, the telomerization reaction between the carbon dioxide and two or more than two types of alkylene oxide can be catalyzed to synthesize a polycarbonate telomer with adjusting glass transition temperature.

New compositions and methods of using those compositions as bonding compositions are provided. The compositions comprise a polymer dispersed or dissolved in a solvent system, and can be used to bond an active wafer to a carrier wafer or substrate to assist in protecting the active wafer and its active sites during subsequent processing and handling. The compositions form bonding layers that are chemically and thermally resistant, but that can also be softened to allow the wafers to slide apart at the appropriate stage in the fabrication process.

The invention discloses a preparation method of a hydrogenation catalyst composition. According to the method, sodium meta-aluminate is adopted as an aluminum source in the preparation of a mixture of an NixWyOz composite oxide precursor and an Al2O3 precursor through a coprecipitation process, and a proper amount of a CO2 gas is accessed in the colloid forming process, so a difficult shaping problem of a bulk phase catalyst is solved, physicochemical properties of the catalyst are adjusted, and the composition which has the characteristics of large specific surface area and uniform aperture distribution and makes many metal active sites be exposed on the catalyst surface allows the utilization rate of active metals to be improved. The catalyst composition of the invention, which has increased apertures and pore volumes, allows the Ni-W high activity sites to be fully utilized and complex macrostructure molecules to easily contact with the active sites, so the catalyst composition is especially suitable for ultra-deep desulfurization reactions for the production of ultraclean diesel oil.

A build-up structure for chip to chip interconnects and System-In-Package utilizing multi-angle vias for electrical and optical routing or bussing of electronic information and controlled CTE dielectrics including mesocomposites to achieve optimum electrical and optical performance of monolithic structures. Die, multiple die, Microelectromechanical Machines (MEMs) and/or other active or passive components such as transducers or capacitors can be accurately positioned on a substrate such as a copper heatsink and multi-angle stud bumps can be placed on the active sites of the components. A first dielectric layer is preferably placed on the components, thereby embedding the components in the structure. Through various processes of photolithography, laser machining, soft lithography or anisotropic conductive film bonding, escape routing and circuitry is formed on the first metal layer. Additional dielectric layers and metal circuitry are formed utilizing multi-angle vias to form escape routing from tight pitch bond pads on the die to other active and passive components. Multi-angle vias can carry electrical or optical information in the form of digital or analog electromagnetic current, or in the form of visible or non-visible optical bussing and interconnections.

Compounds having the active site of natural lipoxins, but a longer tissue half-life are disclosed. In particular, 15-epi-lipoxins and their use in ameliorating undesired cell proliferation, which characterizes diseases such as cancer, are also disclosed.

Photographically useful materials are disclosed comprising a hyperbranched polymer segment and multiple pendant photographically useful groups. Such materials may be prepared by forming an active hyperbranched polymer segment with multiple functionalized end group sites, and reacting the active hyperbranched polymer segment with an active compound comprising a photographically useful group to form a hyperbranched polymer ended with photographically useful groups. The hyperbranched segment may comprise any kind of polymer segment with hyperbranched architecture, and the active end groups may comprise any kind of reactive site. The active hyperbranched polymer may comprise any kind of other functional groups which are located in either backbone or the ends. The hyperbranched polymers containing photographically useful groups obtained in accordance with the invention are particularly advantageous in that they enable polymer structures comprising components exhibiting different photographically useful properties, while maintaining relatively low intrinsic viscosities compared to non-hyperbranched polymers containing photographically useful groups of similar chemical compositions. Additionally, the hyperbranched polymers are advantageous with respect to dendrimer type polymers in that a wide variety of hyperbranched polymer compositions may be synthesized in accordance with commercially acceptable processes.

The present invention generally relates to a method of modifying the surface of substrates such as contact lenses and other biomedical articles by at least partially coating the surfaces of such substrates with a polymeric tie layer having reactive sites. Various other moieties may then be chemically attached to the article surface by reaction of the other moieties with the reactive sites through classical chemical attachment mechanisms.

A novel process for the selective elimination of fatty acid compounds containing carbon-carbon double bonds in trans configuration from a substrate containing cis- and trans-isomers of said fatty acid compounds, by selective adsorption by a microporous zeolite material is disclosed. The pore size and shape of usable zeolite materials enable differentiation between cis- and trans-isomers of unsaturated fatty acid chains. The zeolite materials used have a selectivity ratio alphatrans/cis higher than 1.00; this ratio is defined based on the elution properties of cis and trans double bond containing fatty acid methylesters dissolved in n-hexane during a column chromatography experiment with the zeolite material as the stationary phase and n-hexane as the mobile phase. Besides selective adsorption of trans-unsaturated fatty acid compounds, simultaneous or subsequent total or partial hydrogenation of the double bonds in said compounds can be carried out while using the same or similar zeolite material, containing finely dispersed catalytic active metals. The majority of these catalytic active sites must be inside the pores.

This invention pertains to methods assembly of organic molecules and electrolytes in hybrid electronic. In one embodiment, a is provided that involves contacting a surface/electrode with a compound if formula: R-L²-M-L¹-Z¹ where Z¹ is a surface attachment group; L¹ and L² are independently linker or covalent bonds; M is an information storage molecule; and R is a protected or unprotected reactive site or group; where the contacting results in attachment of the redox-active moiety to the surface via the surface attachment group; and ii) contacting the surface-attached information storage molecule with an electrolyte having the formula: J-Q where J is a charged moiety (e.g., an electrolyte); and Q is a reactive group that is reactive with the reactive group (R) and attaches J to the information storage molecule thereby patterning the electrolyte on the surface.

To provide a method for producing a wide variety of carbazole derivatives which have a simple and uncomplicated process and in which variations in the yield, purity, etc. of a desired substance which are caused by an aryl group introduced is reduced as much as possible. A method for producing a carbazole derivative represented by General Formula (1) is provided, in which 9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole having an active site at the 3-position of the carbazole skeleton and an aromatic compound having an active site are coupled.

In the formula, Ar¹ represents an aryl group with 6 to 13 carbon atoms in a ring, and Ar¹ may have a substituent.

The present invention discloses a heteratom doped carbon nano-tube-graphene complex and a preparation method thereof, and belongs to the technical field of new material preparation. The complex comprises carbon nano-tubes and graphene, wherein heteroatoms are introduced into the complex. The preparation method comprises: adopting catalyst active component loading layered material as a catalyst, adopting chemical vapor deposition, and growing the heteratom doped carbon nano-tube and graphene complex in the presence of a heteratom source. The heteratom doped carbon nano-tube-graphene complex has excellent characteristics of more active sites, good conductivity, easy chemical modification and the like based on maintaining of intrinsic e excellent performances of carbon nano-tubes and graphene, and provides good application prospects in the fields of catalysis, electrochemistry, energy storage and conversion, electronic devices, and the like. The preparation method has characteristics of simpleness, easy engineering magnification, and macroscopic quantity preparation achievement so as to promote carbon nano-tube-graphene complex industrial application.

The invention provides a method for preventing adverse effects associated with the use of a medical device in a patient by introducing into the patient a device of which at least a portion includes a prophylactic or therapeutic amount of a nitric oxide adduct. The nitric oxide adduct can be present in a matrix coating on a surface of the medical device; coated per se on a surface of the medical device; directly or indirectly bound to reactive sites on a surface of the medical device; or at least a portion of the medical device can be formed of a material, such as a polymer, which includes the nitric oxide adduct. Also disclosed is a method for preventing adverse effects associated with the use of a medical device in a patient by locally administering a nitric oxide adduct to the site of contact of said device with any internal tissue.

The compound (W-Z-M) according to the invention comprises a component (M) chosen from the group consisting of markers and therapeutic agents possessing an intracellular active site (A.S.), linked to a ligand (W-Z) comprising an arm (Z) linked to a terminal group (W), characterized in that the linkage between the arm (Z) of the ligand (W-Z) and the component (M) prevents intracellular entry of the compound (W-Z-M) and/or inhibits expression of the marker (M), in that said linkage can be selectively cleaved by factors secreted by target cells so as to permit expression of the marker (M) or entry of the therapeutic agent (M) into said target cells, and in that the terminal group (W) provides for the stability of the compound (W-Z-M) in the serum and circulating blood.

This application provides methods of improving gene therapy by combining gene therapy with active site-specific chaperones (ASSCs). The ASSC increases the stability and efficiency of the protein encoded by the recombinant gene that is administered.

Protective layers are formed on a surface of an atomic layer deposition (ALD) or chemical vapor deposition (CVD) reactor. Parts defining a reaction space for an ALD or CVD reactor can be treated, in situ or ex situ, with chemicals that deactivate reactive sites on the reaction space surface(s). A pre-treatment step can maximize the available reactive sites prior to the treatment step. With reactive sites deactivated by adsorbed treatment reactant, during subsequent processing the reactant gases have reduced reactivity or deposition upon these treated surfaces. Accordingly, purge steps can be greatly shortened and a greater number of runs can be conducted between cleaning steps to remove built-up deposition on the reactor walls.