Abstract:
A biodegradable cationic lipopolymer comprising a polyethylenimine (PEI), a lipid, and a biocompatible hydrophilic polymer, wherein 1) the lipid and the biocompatible hydrophilic polymer are directly linked to the PEI backbone or 2) the lipid is linked to the PEI backbone through the biocompatible hydrophilic polymer. The cationic lipopolymers of the present invention can be used for delivery of a nucleic acid or any anionic bioactive agent to various organs and tissues after local or systemic administration.
Abstract:
The invention relates to crosslinked elastin, a water-soluble crosslinking agent to be used for crosslinking, molded elastin articles, medical instruments and regeneration tissues using the crosslinked elastin, and a surgical therapy method and regeneration treatment wherein the medical instruments are employed. There is provided a biocompatible functional material having elasticity suitable for transplantation into the body without causing detachment of cell adhesion proteins.
Abstract:
A process for the preparation of (co)oligomers or (co)polymers is disclosed. The process entails first the preparation of a mixture that contains a monoethylenically unsaturated monomer conforming to HR1CnullCR2R3nullnull(M) an oxidizing agent and at least one polymer or oligomer conforming to formula (I), 1 and an optional free radical initiator and then heating the mixture at a temperature in the range of 0null C. to 220null C.
Abstract translation:公开了制备(共)低聚物或(共)聚合物的方法。 该方法首先需要制备含有符合HR 1 C = CR 2 R 3(M)的单烯属不饱和单体的混合物,氧化剂和至少一种符合式(I)的聚合物或低聚物, 和任选的自由基引发剂,然后在0℃至220℃的温度下加热该混合物。
Abstract:
Proteins and/or peptides, such as luminal cholecystokinin releasing factor (LCRF) are conjugated with amphiphilic oligomers and polymers. Such conjugates may modulate the pharmacokinetic profile of the proteins and/or peptides, thereby improving their clinical utility. Such conjugates may also stabilize and deliver the proteins and/or peptides, such as LCRF, to receptors in the gut without absorption into the bloodstream.
Abstract:
This application discloses compositions of carbohydrate-modified polymers, such as polyethylenimine modified with cyclodextrin moieties, for carrying drugs and other active agents, such as nucleic acids. Compositions are also disclosed of carbohydrate-modified polymer carriers that release such agents under controlled conditions. The invention also discloses compositions of carbohydrate-modified polymer carriers that are coupled to biorecognition molecules for targeting the delivery of drugs to their site of action.
Abstract:
A nucleic acid complex for delivering a nucleic acid or a derivative thereof to a cell comprises the components: A. a nucleic acid or a derivative thereof; B. a cationic polymer; and C. a preformed polyethylene glycol-cationic polymer copolymer. The complex has a conformation in which the nucleic acid or derivative thereof is condensed and wherein component C is bound to component A such that the poylethylene glycol groups of component C are located at the surface of the complex. The complexes which are stable to aggregation are useful for the delivery of nucleic acids or derivatives thereof to cells in biological systems.
Abstract:
The invention relates to a solid support comprising sites intended for the immobilization of oligonucleotide probes or of proteins or of biological cells having ligands, the sites being provided with chemical species bound to the support by a chemical binding function. The chemical species have a diol group connected to the support by an alkyl chain. Application to biochips.
Abstract:
A polyethylene resin composition comprising 15 to 90% by weight of a polyethylene resin composition (A) and 85 to 10% by weight of a polyolefin resin composition (B), wherein the polyethylene resin composition (A) comprises ultra-high-molecular weight polyethylene (component (a-1)) having an intrinsic viscosity nullnullnull of 10 to 40 dl/g and low-molecular weight to high-molecular weight polyethylene (component (a-2)) having an intrinsic viscosity nullnullnull of 0.1 to 5 dl/g, the amount of said component (a-1) being more than 35% by weight and not more than 90% by weight, the amount of said component (a-2) being not less than 10% by weight and less than 65% by weight, each amount being based on the total amount of the component (a-1) and the component (a-2), and the polyethylene resin composition (A) has a density of 930 to 980 kg/m3 and an intrinsic viscosity nullnullnull of 5 to 35 dl/g. The polyethylene resin composition is excellent in at least the following properties (1) to (8): (1) mechanical properties (mechanical properties equal to or higher than those of conventional ultra-high-molecular weight polyethylene), (2) abrasion resistance (abrasion resistance remarkably improved or enhanced as compared with that of conventional ultra-high-molecular weight polyethylene), (3) appearance, (4) moldability, (5) self-lubricating properties, (6) chemical resistance, (7) impact resistance (impact strength), and (8) flexibility.
Abstract:
The present invention relates to novel polyethylenamine-conjugated oligomeric compounds and to methods of making such compounds. The invention further relates to methods of enhancing the cellular uptake of oligomeric compounds comprising conjugating the compounds to fusogenic moieties such as polyethylenimine.
Abstract:
A material with controlled chemical structure includes at least a biodegradable polymer material and a polysaccharide with linear, branched or crosslinked skeleton. The material is obtained by controlled functionalizing of at least a molecule of the biodegradable polymer or one of its derivatives by covalent grafting directly at its polymeric structure, of at least a molecule of the polysaccharide. A vector preferably in the form of particles obtained from the material and its use as biological vector are also disclosed.