Abstract:
The present invention concerns compositions and methods for the introduction of specific genetic changes in endogenous genes of the cells of an animal. The genetic changes are effected by oligonucleotides or oligonucleotide derivatives and analogs, which are generally less than about 100 nucleotides in length. The invention provides for macromolecular carriers, optionally incorporating ligands for clathrin coated pit receptors. In one embodiment the ligand is a lactose or galactose and the genetic changes are made in hepatocytes. By means of the invention up to 40 % of the copiies of a target gene have been changed in vitro. Repair of mutant genes having a Crigler-Najjar like phenotype and Hemophilia B phenotype were observed.
Abstract:
This invention relates to the production and use of immortalized cell lines from primary chicken embryonic fibroblasts. The cells are useful as substrates for virus propagation, recombinant protein expression and recombinant virus production.
Abstract:
The present invention provides a method and apparatus for utilizing magnetoresistance devices for the measurement of weak magnetic fields. An oscillating excitation magnetic field is applied to a magnetoresistive (MR) sensing element such that the MR element is driven into one or both of two antiparallel saturation states. The amplitude of the excitation field is large enough to reverse the magnetization of the soft layer during each cycle. In one embodiment, the MR element is provided with a current, and a voltage proportional to the resistance is measured. Components of the voltage signal at multiples of the excitation frequency are then proportional to the environmental magnetic field. In one embodiment, an MR element having a resistance-versus-field transfer function that is symmetric (e.g., an anisotropic MR element) is used; while in another embodiment, an MR element having a resistance-versus-field transfer function that is asymmetric (e.g., a spin-valve MR element) is used. Various apparatus and methods for measuring the amount of time spent in one or both saturated states versus the unsaturated or transition states are described. In one embodiment, the magentic excitation field is generated using a current strip deposited onto the top of the other device layers, so that the entire device can be produced on a single chip. In one embodiment, a "flexible" magnetoresistive structure includes a "flexible" ferromagnetic layer having a hard-magnetization-portion layer, and a soft-magnetization-portion layer, thus providing a smooth magnetic transition when this bilayer switches. One embodiment includes s supporting data-read head structure that positions the flexible magnetoresistive (MR) sensing element to sense a magnetic field in a data storage device such as a magnetic-disk drive.
Abstract:
This invention relates to the identification of a gene involved in the gibberellin signal transduction pathway. Mutations to this gene mimic the effect of gibberellin treatment and transgenic plants expressing the gene correct a spindly phenotype. Methods are disclosed for isolating and using the gene from a variety of plants.
Abstract:
A process for catalytic partial oxidation of a hydrocarbon is pro vided. The process includes: providing a feed gas mixture comprising an oxygen-containing gas and a hydrocarbon gas comprising one or more normal (C2-C4)alkanes; providing a catalyst structure having a transparency of at least about 40 %; and passing the feed gas mixture through the catalyst structure at a rate such that the superficial contact time of the feed gas mixture with the catalyst structure is no greater than about 1000 microseconds to produce an exit gas mixture comprising partial oxidation products.
Abstract:
A novel pathway for the synthesis of polyhydroxyalkanoates is provided. A method of synthesizing a recombinant polyhydroxyalkanoate monomer synthase is also provided. These recombinant polyhydroxyalkanoate synthases are derived from multifunctional fatty acid synthases or polyketide synthases and generate hydroxyacyl acids capable of polymerization by a polyhydroxyalkanoate synthase.
Abstract:
An air flow system (10) for detecting target flow rates as a function of an opening (32, 42) in a flow restrictor (18, 20). A negative pressure sensor (50, 52) is triggered in response to a negative pressure condition in a chamber (23, 25) in the flow restrictor (18, 20). Target flow rates are preselected by using a flow restrictor (18, 20) having a particular size restrictor. Triggering of the negative pressure sensor (50, 52) may be used for controlling various medical treatments. A signal generated when a target flow rate is reached may be used for administering aerosols during inhalation, activation of HFCC therapy during exhalation, or to control various other medical treatments. The air flow system (10) allows for selection of a narrow flow rate range for administering aerosols during inhalation to target particular areas in the respiratory tree as major deposition sites for the aerosols.
Abstract:
Live or modified live PRRS vaccines for administration to swine are provided which are of low virulence and confer effective immunity against PRRS. The preferred vaccines include virus isolates having average plaque diameters of less than about 2 mm and low pathogenicity. A preferred vaccine includes a small plaque diameter strain, ATCC Accession No. VR2509. The vaccines of the invention may be administered to breeding females or gilts and to weaned piglets, and is effective to immunize the swine against both the respiratory and reproductive forms of the disease.
Abstract:
A polymer useful as a solid support for a variety of applications is provided. The polymer is prepared from a composition comprising at least one type of olefinic monomer and a multifunctional (meth)acrylate cross-linker of formula (I), wherein (a) R , R , and R are each independently hydrogen or a methyl group; (b) R is hydrogen or an organic group or substituent that can interact in the polymerization and/or cross-linking process or is nonreactive under the conditions of the polymerization and/or cross-linking process; (c) R , R , and R are each independently -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH(CH3)-, or -CH(CH3)-CH2-; (d) each of 1, m, and n is no greater than about 100 with the proviso that at least one of 1, m, or n is at least 1.
Abstract:
A method of preparing a korupensamine or an analog thereof comprising: (a) reacting a compound of formula (III), wherein each of R and R is CH3 or H, X is I, Y is (C1-C4)alkyl, benzyl or CHO, and each of R and R is (C1-C4)alkyl, benzyl, (C2-C5)acyl or an acid-labile hydroxy protecting group; with a compound of formula (IV), wherein R is benzyl, (C2-C5)acyl or an acid-labile hydroxy protecting group, R is B(OH)2, and R is (C1-C4)alkyl; in the presence of a Pd(0) catalyst and an inorganic base in an organic solvent, to yield a compound of formula (V), wherein Y, R , R , R , R , R and R are as defined above for compounds of formula (III) and (IV). Additionally the intermediates of formula (III), wherein X is Br, Cl or I, Y is H, (C1-C4)alkyl, benzyl, or CHO, each of R and R 3 is a protecting group selected from the group consisting of (C1-C4)alkyl, benzyl, (C2-C5)acyl and an acid-labile hydroxy protecting group; and R is H or (C2-C5)acyl; or wherein X is Br, Cl or I, Y is H, (C1-C4)alkyl, benzyl, or CHO, each of R and R is H or CH5, R is H or (C2-C5)acyl and R is a protecting group selected from the group consisting of (C1-C4)alkyl, benzyl, (C2-C5)acyl and an acid-labile hydroxy protecting group; and the intermediates of formula (IV), wherein R is Cl, Br, I, B(OH)2, an anhydride or ester of B(OH)2, or OSO2R , wherein R is (C1-C4)perfluoroalkyl, and each of R and R is H, (C1-C4)alkyl, benzyl, (C2-C5)acyl or an acid-labile hydroxy protecting group.