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스테로이드가 신생 흰쥐 해마형성체 신경원의 퇴행에 미치는 영향
임경택,채희선,김성수,김경용,이원복 중앙대학교 의과대학 의과학연구소 1998 中央醫大誌 Vol.23 No.1
The influences of adrenal corticosteroid on the development and regression of the neurons of hippocampal and dentate were examined in the steroid overloaded neonatal rats. The results obtained were as follows. The regression occurred naturally in numerous dentate granule cells and hippocampal pyramidal cells, which was the apoptotic process. The apoptotic granule cells in dentate gyrus decreased in number with steroid overload, and this change was more prominent at 6 days than at 4 days. The decrease in the number of apoptotic neurons by steroid overload occurred only in the upper limb of dentate gyrus at 6 days. The gradient of regression in dentate gyrus had no relation with the gradient of neurogenesis, and the regression of hippocampal pyramidal cells decreased in the gyrus but not in CA regions. In conclusion, the cell death occurred in neurons of hippocampal formation, which was the process of apoptosis. The adrenal corticosteroid seemed to be influential significantly on the development and regression of the neurons.
소의 분변과 도체에서 shiga toxin-producing Escherichia coli의 분리와 특성
채희선 ( Hee Sun Chae ),김능희 ( Neung Hee Kim ),한혜진 ( Hye Jin Han ),손홍락 ( Hong Rak Son ),김창기 ( Chang Ki Kim ),김선흥 ( Sun Heung Kim ),이정학 ( Jung Hark Lee ),김종택 ( Jong Taek Kim ) 한국동물위생학회 2009 한국동물위생학회지 (KOJVS) Vol.32 No.3
Shiga toxin (Stx)-producing Escherichia coli (STEC) strains can cause broad spectrum of human disease, including diarrhea, hemorrhagic colitis, and the life-threatening hemolytic uremic colitis (HUS). We examined 868 samples was taken from bovine feces and carcass from January to December 2008 in Seoul. Twenty two (9.5%) shiga toxin -producing Escherichia coli were isolated from the 230 of bovine feces, and two (0.31%) were isolated from the 638 of carcasses. Serotype of E. coli isolates were O157 (10, 41.6%), O26 (10, 41.6%), O111 (1, 4.2%) and UT (3, 12.6%). In PCR, the isolates displayed three different stx gene combination (stx1〔2, 8.4%〕], stx2〔3, 12.6%〕and stx1 and stx2〔19, 87.5%〕). The eaeA and hlyA gene were found in 11 (45.8%) of the 24 strains. Saa gene was present only one strains (4.2%). Toxin typing using reverse passive latex agglutination test showed the same result in VT 1. But it showed different result in VT 2. In antimicrobial susceptibility test, all isolates were sensitive to amikacin, amoxicillin/clavulanic acid, ciprofloxacin and colistin. Eighteen strains (75.0%) of 24 isolates showed the multi-resistant patterns with over 3 drugs. PFGE was performed after the genomic DNA of twenty four isolates was digested with Xba I. the 24 isolates showed 7 (A~G) PFGE type.
( Taek Hwan Lee ),( Ji Hee Kang ),( Jae Ok Seo ),( So Hyeon Baek ),( Sang Hyun Moh ),( Jae Kyoung Chae ),( Yong Un Park ),( Young Tag Ko ),( Sun Yeou Kim ) 한국응용약물학회 2016 Biomolecules & Therapeutics(구 응용약물학회지) Vol.24 No.1
We already reported that genetically engineered resveratrol-enriched rice (RR) showed to down-regulate skin melanogenesis. To be developed to increase the bioactivity of RR using calli from plants, RR was adopted for mass production using plant tissue culture technologies. In addition, high-pressure homogenization (HPH) was used to increase the biocompatibility and penetration of the calli from RR into the skin. We aimed to develop anti-melanogenic agents incorporating calli of RR (cRR) and nanoparticles by high-pressure homogenization, examining the synergistic effects on the inhibition of UVB-induced hyperpigmentation. Depigmentation was observed following topical application of micro-cRR, nano-calli of normal rice (cNR), and nano-cRR to ultraviolet B (UVB)-stimulated hyperpigmented guinea pig dorsal skin. Colorimetric analysis, tyrosinase immunostaining, and Fontana-Masson staining for UVB-promoted melanin were performed. Nano-cRR inhibited changes in the melanin color index caused by UVBpromoted hyperpigmentation, and demonstrated stronger anti-melanogenic potential than micro-cRR. In epidermal skin, nanocRR repressed UVB-promoted melanin granules, thereby suppressing hyperpigmentation. The UVB-enhanced, highly expressed tyrosinase in the basal layer of the epidermis was inhibited by nano-cRR more prominently than by micro-cRR and nano-cNR. The anti-melanogenic potency of nano-cRR also depended on pH and particle size. Nano-cRR shows promising potential to regulate skin pigmentation following UVB exposure.
Module level EMC verification method for replacement items in nuclear power plant
Hee-Taek Lim,Moon-Gi Min,Hyun-Ki Kim,Gwang-Hyun Lee,Chae-Hyun Yang Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Internal replaceable electronic module substitutions can impact EMC (ElectroMagnetic Compatibility) qualification testing and results if EMC testing is conducted at the cabinet level. The impact of component substitutions on EMC qualification results therefore should be evaluated. If a qualitative evaluation is not adequate to ensure that the modified product will not impact the cabinet level EMC qualification results, a new qualification testing should be conducted. Component level retesting should be conducted under electromagnetically equivalent conditions with the cabinet level test. This paper analyzes the propagation of conducted susceptibility test waveforms in a representative cabinet and evaluates the impact of component substitutions on cabinet level EMC qualification results according to the location of the replacement items. A guideline for a qualitative evaluation of the impact of component substitutions is described based on the propagation of the conducted susceptibility test waveforms. A module level test method is also described based on an analysis of the shielding effectiveness of the cabinet.
Jeong-Chae Lee,Hee-Young Jung,Kye-Taek Lim 한국독성학회 1999 Toxicological Research Vol.15 No.2
The study was carried out to investigate the effects of water or ethanol extracts from Rhus verniciflua Stokes (RVS) on antitumor and cholesterol level in mouse. Also, to measure antioxidative activities, the extracts from RVS were estimated by deoxyribose and hypoxanthine/xanthine oxidase assay. When mice were treated with RVS extracts as described in experimental design, concentration of total plasma cholesterol (TC), low density lipoprotein (LDL), and very low density lipoprotein (VLDL) cholesterol were significantly lower (P<0.001) in the two groups treated with water or ethanol extracts respectively, compared to it in control. To test the inhibitory effect of RVS extracts on tumor growth, in vivo, mice (BALB/c) were inoculated with 0.25 ml/head CT-26 cells (1 ×106 cells/ml) subcutaneously. On day 1, 4, 8, and 16 after inoculation, the mice were injected directly into the tumor tissues with 25 ㎕ of water extract (30 mg/ ml) or 25 ㎕ of ethanol extracts (30 mg/ml) from RVS individually. On day 23, the mice were killed and the size of tumor tissues were measured as unit of centimeter through diameter. When the mice were injected with water or ethanol extracts on day 1 after inoculation of CT-26 cells, the tumor sizes were measured with 0.4 cm or 0.5 cm respectively, while the size was 1.5 cm in control, which was not treated with any RVS extracts after inoculation of CT-26 cells. In general, ethanol extracts of RVS were shown more inhibitory effect of tumor growth than that in water extracts of RVS. In deoxyribose and hypoxanthine/xanthine oxidase assay, all the RVS extracts resulted to scavenge superoxide (0-₂) as well as hydroxyl radical (OHㆍ) efficiently. Especially the antioxidative activity against hydroxyl radical was shown more specific in ethanol extract of RVS than that of water extract. In conclusion, this experiment indicated that RVS extracts can playa role as tumor growth inhibitors as well as natural antioxidant and reduced cholesterol level in mouse plasma.
소와 돼지도체에서 Listeria monocytogenes의 분리 및 PCR 검출 방법에 관한 연구
채희선 ( Hee Sun Chae ),김두환 ( Doo Hwan Kim ),김규현 ( Gu Hyun Kim ),신방우 ( Bang Woo Shin ),조미영 ( Mi Yoeng Jo ),권택부 ( Taek Boo Kweon ),이정학 ( Jung Hak Lee ) 한국동물위생학회 2003 한국동물위생학회지 (KOJVS) Vol.26 No.2
From February 2000 to December 2001, A total of 1,785 samples was taken from beef and pork carcasses in Seoul. Seven(0.69%) Listeria spp. were isolated from the 1,014 of beef carcasses, and five(0.65%) were isolated from the 771 of pork carcasses. The isolates were identified L monocytogenes by API listeria, and VIDAS LMO kit, serological test and PCR assay were performed. A total 12 strains of L monocytogenes were isolated form samples tested and all of the strains were classified into serotype 1. PCR primers are selected to amplify a 520-base pair(bp) DNA fragment from the listeolysin O gene(hlyA) of Listeria monocytogenes. A 520-bp product was detected in PCR with DNA from L monocytogenes, but not from the other Listeria species tested.
Lee, Taek Hwan,Kang, Ji Hee,Seo, Jae Ok,Baek, So-Hyeon,Moh, Sang Hyun,Chae, Jae Kyoung,Park, Yong Un,Ko, Young Tag,Kim, Sun Yeou The Korean Society of Applied Pharmacology 2016 Biomolecules & Therapeutics(구 응용약물학회지) Vol.24 No.1
We already reported that genetically engineered resveratrol-enriched rice (RR) showed to down-regulate skin melanogenesis. To be developed to increase the bioactivity of RR using calli from plants, RR was adopted for mass production using plant tissue culture technologies. In addition, high-pressure homogenization (HPH) was used to increase the biocompatibility and penetration of the calli from RR into the skin. We aimed to develop anti-melanogenic agents incorporating calli of RR (cRR) and nanoparticles by high-pressure homogenization, examining the synergistic effects on the inhibition of UVB-induced hyperpigmentation. Depigmentation was observed following topical application of micro-cRR, nano-calli of normal rice (cNR), and nano-cRR to ultraviolet B (UVB)-stimulated hyperpigmented guinea pig dorsal skin. Colorimetric analysis, tyrosinase immunostaining, and Fontana-Masson staining for UVB-promoted melanin were performed. Nano-cRR inhibited changes in the melanin color index caused by UVB-promoted hyperpigmentation, and demonstrated stronger anti-melanogenic potential than micro-cRR. In epidermal skin, nano-cRR repressed UVB-promoted melanin granules, thereby suppressing hyperpigmentation. The UVB-enhanced, highly expressed tyrosinase in the basal layer of the epidermis was inhibited by nano-cRR more prominently than by micro-cRR and nano-cNR. The anti-melanogenic potency of nano-cRR also depended on pH and particle size. Nano-cRR shows promising potential to regulate skin pigmentation following UVB exposure.