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NON-METAL KEY CHAIN FEATURING A
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Technical Examples
- A main chain-type or side chain-type polymeric compound having a structure wherein at least one metal complex segment having a plurality ligands is introduced into a main chain or a side chain is provided. In the case where the polymeric compound is the main chain-type polymeric compound, the metal complex segment has at least one ligand constituting a polymer main chain of the polymeric compound and having a carbon atom and oxygen atom bonded to a metal atom. On the other hand, in the case where the polymeric compound is the side chain-type polymeric compound, a polymer main chain thereof has a conjugated structure, preferably a conjugated double bond. A ligand for the polymeric compound includes a chain or cyclic ligand, of which a bidentate ligand having an organic cyclic structure is preferred, and the ligand has at least one carbon atom or oxygen atom and is bonded to a center metal atom, preferably iridium, via the carbon atom or oxygen atom. In a case of forming a luminescence layer by using the polymeric compound as a luminescent material, a resultant organic luminescence device is less liable to cause a concentration extinction and is a high-luminescence efficiency device excellent in stability.
- A low CTE metal-ceramic composite material featuring carbon fibers reinforcing a matrix featuring silicon metal or silicon alloy. The fibers have a low coefficient of thermal expansion (CTE) in the axial direction, and preferably negative. The principles of making Si/SiC composites can be adapted to produce the instant Si matrix composites. The CTE of the composite body depends not only upon the relative CTE's of the fibers and matrix, and their relative amounts (e.g., loadings), but also upon the relative elastic moduli of the fibers and matrix. Thus, Si/SiC matrices produced by a reaction-bonding process inherently possess low CTE, but the instant inventors prefer to make such composites having relatively large fractions of unreacted silicon, thereby driving composite CTE lower still. Here, the carbon fibers are protected from reaction with the silicon infiltrant with one or more materials disposed between the fibers and the infiltrant. Providing at least a degree of toughness or impact resistance can also be realized in these composites. Laminates produce Isotropic or quasi-isotropic properties in the composite body can be realized by, for example, providing the fibers in the form of cross-plied laminates featuring the fibers in parallel or woven arrays.
- The present invention provides metal ion affinity peptides, fusion proteins comprising metal ion affinity peptides, and polynucleotides encoding the fusion proteins. A feature of the subject invention is that the metal ion affinity peptide has a formula selected from the group consisting of: formula 1: (His-X1-X2)n1-(His-X3-X4-X5)n2-(His-X6)n3, wherein each of X1 and X2 is independently an amino acid with an aliphatic or an amide side chain, each of X3, X4, X5 is independently an amino acid with a basic side chain (except His) or an acidic side chain, each X6 is an amino acid with an aliphatic or an amide side chain, n1 and n2 are each independently 1-3, and n3 is 1-5; formula 2: (His-Asn)n, where n=3 to 10; and formula 3: (His-X1-X2)n, wherein each of X1 and X2 is an amino acid having an acidic side chain, and n=3 to 10. The invention further provides recombinant vectors comprising subject polynucleotides, and host cells comprising the recombinant vectors. The invention further provides methods and kits for purifying a fusion protein comprising a metal ion affinity peptide.
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