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정해원,최진영,이원영 대한보건협회 1988 대한보건연구 Vol.14 No.1
Drug resistance of P 815 mouse tumor cells after various drug treatment were studied "by scoring the changes of cell sizes. Percent of cells with abnormal large cell size (larger than 15㎛. in diameter) increased by treatment of anticancer drugs. When the cells were treated with adriamycin, cells larger than 15㎛ in diameter were observed at second day post-treatment and the percent of larger cells reached maximum at 9th day post-treatment. Similar trends were observed following the treatment with cisplatin, 5-Fu, or methotrexate. Inverse relationship between survival of tumor cell population and percent distribution of large cells was observed when cisplatin was treated. Thus it was suggested that co-existence of abnormal large cells and cells in original size in the tumor cell population after drug treatment might be a key to determine that the cell line is resistant which thereby indication for next drug of choice.
유기물 바인더를 사용한 $YBa_2Cu_3O_{7-$\delta$}$ 초전도 Coil의 제조
정해원,박승만,김재묵,김성수 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.3
One of the possible ways to make a flexible wire of high-Tc superconductiong ceramics is the extrusion of a mixture slurry of superconducting powder with an appropriate polymer binder. The fabrication procedure for YBa2Cu3O7-$\delta$ superconducting coils with this plastic mass is described. The major factors limiting the formation of extruded wire are the binder content, powder size, and entrapped gas in the mixture slurries. The optimum content of binder for both good flexbility and strength of wire was estimated to be 30wt%. The finer the powder size is, the more homogeneous structure the extruded wire has. The vacuum degassing before extrusion was necessary to remove the entrapped gas in as-extruded wire. The formability of wire depends greatly on the wire radius and binder content. After burning out the binder and the successive sintering, the contacts between the superconducting grains could be made. The resistivity vs. temperature behavior measured in the final wire showed the transition temperature of 90K with narrow transition width. However, the critical current densities of these wires are much lower in comparison to those of conventional bulk specimens.
정해원,유영수 한국환경보건학회 1982 한국환경보건학회지 Vol.8 No.1
Ethylene oxide gas has been used as a cold sterilant for heat-sensitive medical equipments and as a fumigant for food for more than 30 years, and it is used more widely than radiation although radiation sterilization has made significant inroads in recent years. But according to recent studies of toxicities such as mutagenicity, haemolytic effect and possible carcinogenicity of Ethylene oxide (ETO) and its two main reaction products, Ethylene chlorohydrin (ETCH) and Ethylene glycol (ETG), Environmental Protection Agency in U.S.A. has suggested some regulations on residual gas in drug products and medical devices for human use. The mutagenic activity of ETO compared with that of X-ray has an equivalency of 1 ppm/hr for ETO as compared to 20 mrad for X-ray, and one could suggest the present maximum allowable concentration for ETO (50 ppm) should be 400 times lower than the radiation standard (2.5 mrad/hr). Although radiation sterilization has advantages of simplicity of operation and complete reliability, changes of physico-chemical properties with possible formation of toxic substances may occur. It is therefore necessary to make some regulations of our own for residual toxicities orginated from each sterilization method.
Acute lymphoblastic leukemia and chronic lymphocytic leukemia in dogs
정해원,정동인 충북대학교 동물의학연구소 2014 Journal of Biomedical and Translational Research Vol.15 No.1
An Australian cattle dog (case 1: 6-year-old castrated male) and a Shih-Tzu dog (case 2: 8-year-old castrated male) were referred to the Gyeongsang Animal Medical Center due to anorexia and depression. Physical examina- tions, complete blood counts, serum chemical analysis, radi- ography, ultrasonography, and bone marrow biopsy were performed. Upon physical examinations of cases 1 and 2, enlargement of superficial lymph nodes was not identified. Hematologic findings in these dogs included leukocytosis with severe lymphocytosis, anemia, and thrombocytopenia. Upon radiography, both dogs showed splenomegaly. Upon examination of a peripheral blood smear in case 1, imma- ture lymphoid cells, featuring decreased nuclear chromatin condensation and nuclear pleomorphism, were present. Biopsy samples of the bone marrow in case 1 revealed hypercellularity as well as a large number of immature lymphoblastic cells similar in shape to cells in the peripheral blood. The characteristic morphological features of periph- eral blood and bone marrow samples in case 2 were small lymphocytes. Thus, the dogs were tentatively diagnosed with acute lymphoblastic leukemia (ALL) and chronic lymphocytic leukemia (CLL), respectively. After diagnosis, the CLL patient was administered chlorambucil and pred- nisolone therapy. Due to its similarity to human leukemia, the canine leukemia model provides a valuable model for research into human leukemia.