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The synthesis and characterization of a collagen mimetic dendrimer composed of the Gly-Pro-Nleu sequence is described. The dendrimer is built on a ‘first generation’ poly(amidoamine) core and is synthesized in 38% yield. This dendrimer exhibits a melting temperature of 25 °C, which is in between previously studied analogous molecules of identical sequence and length. 相似文献
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The synthesis and characterization of hydroxamic acid containing single-chain and TRIS-assembled (where TRIS is tris(carboxyethoxymethyl)aminomethane) collagen mimetics are reported. We have engineered an Fe(III)-binding domain by placing a hydroxamic acid group at the C termini of collagen mimetic chains composed of the Gly-Pro-NLeu sequence. The circular dichroism spectra and thermal denaturation studies show an enhancement in triple-helical thermal stability upon the addition of Fe(III) for the TRIS-assembled structure. No triple-helical structure was detected for the single-chain collagen mimetic. From the absorbance shown in the UV-vis spectra, we believe that the thermal stabilization of the triple helix is the direct result of a coordination complex between Fe(III) and the hydroxamate groups tethered to the C termini of the collagen mimetic peptide chains. 相似文献
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The structural and electronic transport properties of La1−x
Ce
x
MnO3 (x=0.0–1.0) have been studied. All the samples exhibit orthorhombic crystal symmetry and the unit cell volume decreases with
Ce doping. They also make a metal-insulator transition (MIT) and transition temperature increases with increase in Ce concentration
up to 50% doping. The system La0.5Ce0.5MnO3 also exhibits MIT instead of charge-ordered state as observed in the hole doped systems of the same composition. 相似文献
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Jérôme JP. Leon 《Letters in Mathematical Physics》1981,5(1):75-80
We establish a transformation which connects the potentials of the one-dimensional Dirac and Klein-Gordon operators. This transformation links the solutions of the nonlinear evolution equations solvable by means of the two inverse spectral transforms which use the Dirac and Klein-Gordon direct and inverse spectral problems. 相似文献
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