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박충서 中央醫學社 1972 中央醫學 Vol.23 No.4
Eleven cases of cryptogenic brain atrophy v. as selected from several hundred brain atrophy cases to be analyzed in detail. It can occur at any age with symptoms of headache, dizziness, weak vision, poor memory, paresthesia etc as those in neurosis. Physical examination discloses often pyramidal signs mainly or nothing neurological but for neurotic signs. Electroencephalograms show theta or delta waves diffusely or focally and spinal fluid manifests occasional increase of cells and/or protein.
朴忠緖 現代醫學社 1968 現代醫學 Vol.9 No.1
The aim of this study is to prepare biodegradable microspheres without the use of surfactants or emulsifiers for a novel sustained delivery carriers of protein drugs. A poly(e-caprolactone)/ poly(ethylene glycol)/poly(s-caprolactone) (CEC) triblock copolymer was synthesized by the ring-opening of e-caprolactone with dihydroxy poly (ethylene glycol) to prepare surfactant-free microspheres. When dichloromethane (DCM) or ethyl formate (EF) was used as a solvent, the formation of microspheres did not occur. Although the microspheres could be formed prior to lyophilization under certain conditions, the morphology of microspheres was not maintained during the filtration and lyophilization process. Surfactant-free microspheres were only formed when ethyl acetate (EA) was used as the organic solvent and showed good spherical micro-spheres although the surfaces appeared irregular. The content of the protein in the micro-sphere was lower than expected, probably because of the presence of water channels and pores. The protein release kinetics showed a burst release until 2 days and after that sustained release pattern was showed. Therefore, these observations indicated that the formation of microsphere without the use of surfactant is feasible, and, this the improved process, the protein is readily incorporated in the microsphere.