<英文原著>外眼筋の表面筋電図と周波数分析

A new designed surface electrode for electromyogram (EMG) of extraocular muscle and spectral analysis is described. Electrode was made of a pair of silver-silver cloride wires which were embedded in both end of sclero-corneal shell which was made by silicone rubber to bring them closer to the medial and lateral rectus muscles. Power spectrum was computed of interference EMG during static and acting conditions. EMG of extraocular muscles demonstrated higher power spectrum than those of facial muscles. These enable us to pick up electrical activity of extraocular muscles and distinguish them from that of facial muscles

Controlling Surface Segregation of a Polymer To Display Carboxy Groups on an Outermost Surface Using Perfluoroacyl Groups

Controlling the surface properties of solid polymers is important for practical applications. We here succeeded in controlling the surface segregation of polymers to display carboxy groups on an outermost surface, which allowed the covalent immobilization of functional molecules via the carboxy groups on a substrate surface. Random methacrylate-based copolymers containing carboxy groups, which were protected with perfluoroacyl (R_f) groups, were dip-coated on acrylic substrate surfaces. X-ray photoelectron spectroscopy and contact-angle measurements revealed that the R_f groups were segregated to the outermost surface of the dip-coated substrates. The R_f groups were removed by hydrolysis of the R_f esters in the copolymers, resulting in the display of carboxy groups on the surface. The quantification of carboxy groups on a surface revealed that the carboxy groups were reactive to a water-soluble solute in an aqueous solution. The surface segregation was affected by the molecular structure of the copolymer used for dip-coating

Surfactant-Induced Polymer Segregation To Produce Antifouling Surfaces via Dip-Coating with an Amphiphilic Polymer

We propose a rational strategy to control the surface segregation of an amphiphilic copolymer in its dip-coating with a low-molecular-weight surfactant. We synthesized a water-insoluble methacrylate-based copolymer containing oligo­(ethylene glycol) (OEG) (copolymer <b>1</b>) and a perfluoroalkylated surfactant (surfactant <b>1</b>) containing OEG. The dip-coating of copolymer <b>1</b> with surfactant <b>1</b> resulted in the segregation of surfactant <b>1</b> on the top surface of the dip-coated layer due to the high hydrophobicity of its perfluoroalkyl group. OEG moieties of surfactant <b>1</b> were accompanied by those of copolymer <b>1</b> in its segregation, allowing the OEG moieties of copolymer <b>1</b> to be located just below the top surface of the dip-coated layer. The removal of surfactant <b>1</b> produced the surface covered by the OEG moieties of the copolymer that exhibited antifouling properties. Using this strategy, we also succeeded in the introduction of carboxy groups on the dip-coated surface and demonstrated that the carboxy groups were available for the immobilization of functional molecules on the surface