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형광백혈구 안저촬영술에서 플로레신 염색의 안정성과 형광림프구의 분리
김윤희,강필성,김강주,양연식,김재덕 圓光大學校 醫科學硏究所 1998 圓光醫科學 Vol.14 No.1
Recently, retinal blood flow has been studied with several methods, targeted dye delivery method, fluorescent vesicle system, laser Doppler velocimetry, acridine orange staining method. Authors presented a new method, fluorescein leukocyte angiography using a scanning laser ophthalmoscope which include external staining of leukocyte with fluorescein dye and reintroduce the fluorescent leukocyte into the blood flow. Authors tried to check security of external fluorescein staining of leukocytes and separation of fluorescent lymphocytes from whole blood and supernatant fluid using Ficoll-Paque, with cell viability, leukocyte recovery rate and erythrocyte contamination rate. There was no significant difference in cell viability, leukocyte recovery rate and erythrocyte contamination rate between fluorescein staining group and non-staining group. Fluorescent lymphocytes could be separated from whole blood and supernatant solution after gravity sedimentation with 6% hetastarch and the gravity sedimented group had low erythrocyte contamination rate than whole blood group(p≤0.05). In conclusion, external fluorescein staining procedure of leukocyte during fluorescein leukocyte angiography could be performed without cell injury compared to non-fluorescein staining group and fluorescent lymphocyte could be separated from whole blood and supernatant fluid after gravity sedimentation.
Ju-Won Kang,Jung-Pil Suh,Dong-Min Kim,Chang-Sik Oh,Ji-Min Oh,Sang-Nag Ahn 한국육종학회 2008 한국육종학회지 Vol.40 No.3
In the previous study, 141 BC3F2 lines from a cross between the Oryza sativa cv. Milyang 23 and O. glaberrima were used to identify favorable wild QTL alleles for yield component traits. In this study, we carried out QTL analysis of four grain morphology as well as four yield component traits using 141 BC3F5 lines from the same cross and compared QTLs detected in two different generations. The mean number of O. glaberrima segments in the 141 BC3F5 lines ranged from 1 to 13 with 2.69 and 5.71 of the average means of homozygous and heterozygous segments, respectively. There was a three-fold difference in the number of QTLs detected for four traits commonly evaluated in two generations (seven QTLs in the BC3F5 vs 21 in the BC3F2 population). The percentages of the phenotypic variance explained by QTLs in the BC3F5 population were similar to or less than those in the BC3F2 population. This is probably due to the difference in the genetic composition of two populations and the environmental effects. The locations of the QTLs commonly detected in both generations were in good agreement except for one QTL for spikelets per panicle. The yield QTL, yd3 was colocalized with the spikelets per panicle, spp3. Yield increase at this locus is due to the increase in spikelets per panicle, because both traits were associated with increase in spikelets per panicle and yield due to the presence of an O. glaberrima allele. Clusters of QTLs for grain morphology traits were observed in two chromosome regions. One cluster harboring five QTLs near SSR markers RM106 and RM263 was detected on chromosome 2. This population would serve as a foundation for development of the introgression line population from a cross between Milyang 23 and O. glaberrima.
압연을 이용한 Sn-37 Pb 와 Sn-3.5 Ag 솔더의 무플럭스 솔더링에 관한 연구
강춘식,정재필,홍순민,박창배,Ekere, Ndy N.,Rajkumar, D. 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.7
UBM-coated Si-wafer was fluxlessly soldered with glass substrate in N₂ atmosphere using rolled solder sheet. The bulk Sn-37wt%Pb and Sn-3.5wt%Ag solders were rolled to the sheet of 100㎛ thickness in order to achieve a bonding to Si-wafer by fluxless reflow process. The oxide layer on the solder surface was analysed by AES(Auger Electron Spectroscopy). Through rolling, the oxide layer on the solder surface became thin. It was possible to bond a solder disc to the Si-wafer with fluxless process in N₂ gas. Wetting angle of the fluxless soldered disc on the Si-wafer was about 9∼10°. The Si-wafer with a rolled solder was bonded to glass without flux in N₂ atmosphere. The joint was sound, and the thicknesse of intermetallic compound along the interface of Si-wafer was less than 2㎛.
강춘식,정재필,이진영 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.5
A new method of diffusion bonding(named as Melting Induced Diffusion Bonding) which aimed to make better Transient Liquid Phase(TLP) bonding was developed and applied to the bonding of 304/304 stainless steel. On a new method, boron layer was used as a insert material and its melting point is higher than that of the base metal, therefore insert doesn't melt during bonding, which is different from TLP bonding and brazing. Base metal is bonded by melting of base metal itself which is caused by the reaction of base metal with boron during bonding. By applying a new bonding method to 304 stainless steel, we obtained 421㎫ tensile strength and 17% elongation of the bonded joint.
Evaluation of Haemagglutinin Content by RP-HPLC to Generate Pandemic Influenza Vaccine
Kang, Hyunkyung,Roh, Hang Sik,Song, Hyemin,Lee, Kwangmoon,Chung, Seung-Tae,Ban, Sang-ja,Mo, In Pil,An, Beum-Soo,Ahn, Chi-Young Korean Society of ToxicologyKorea Environmental Mu 2016 Toxicological Research Vol.32 No.4
The potency of influenza vaccine is determined based on its hemagglutinin (HA) content. In general, single radial immunodiffusion (SRID) assay has been utilized as the standard method to measure HA content. However, preparation of reagents for SRID such as antigen and antibody takes approximately 2~3 months, which causes delays in the development of influenza vaccine. Therefore, quantification of HA content by other alternative methods is required. In this study, we measured HA contents of H1N1 antigen and H1N1 influenza vaccine by reverse phase-high performance liquid chromatography (RP-HPLC) methods. The presence of HA1 and HA2 was investigated by silver staining and Western blot assay. In addition, accuracy and repeatability of HA measurement by RP-HPLC were evaluated. Comparison of HA concentration by SRID and RP-HPLC revealed a precise correlation between the two methods. Our results suggest that RP-HPLC assay can replace SRID in the event of a pandemic flu outbreak for rapid vaccine development.