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A new class of macrocyclic lanthanide complexes, Ln/DTPA-PDA-C(sub n), is developed for cellular labeling and magnetic resonance imaging (MRI) applications. These agents, combining with 3-dimensional MRI microscopy, have broad applications in imaging cell movement and localization in different biological systems in vivo.

A poly(methyl methacrylate)-intercalated graphite oxide/poly(methyl methacrylate) nanocomposite was prepared by emulsion polymerization of methyl methacrylate in the presence of graphite oxide (GO). GO was synthesized by the oxidization of natural graphite powder with KMn[O.sub.4] in concentrated sulfuric acid. The functional groups and microstructure of the oxidized graphite and the composite were carefully characterized by use of X-ray diffraction, infrared, transmission electron microscopy, and elemental analysis. The electrical conductivity and mechanical properties were also measured. Polym. Eng. Sci. 44:2335-2339, 2004. © 2004 Society of Plastics Engineers., INTRODUCTION Conducting polymer composites have been extensively studied because of their potential applications in batteries, antistatic, electromagnetic shielding, electrorheological fluids, and other applications (1-8). Since natural graphite (NG) has high [...]

Michel-addition polymerization of disulfide-based diacrylate and equimolar N-methyl ethylenediamine (MEDA) has formed ABB' type intermediates. The poly(amino ester)s have stimuli-sensitive disulfide bonds in the backbone that can be cleaved under dithiothreitol (DTT), affording these poly(amino ester)s with potential applications.