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Cho, Eun Sook,Jin, Byung Rae,Sohn, Hung Dae,Choi, Kwang Ho,Kim, Soung Ryul,Kang, Seok Woo,Yun, Eun Young,Kim, Sang Hyun,Kim, Keun Young,Je, Yeon Ho,Kang, Seok Kwon 한국잠사학회 1998 한국잠사곤충학회지 Vol.40 No.2
To construct transfurmed Bm5 cells, Autographa californica nuclear polyhedrosis virus(AcNPV) IE1 gene, an immediate early viral gene was firstly used in this study. AcNPV IE1 gene, which shares on 95.3% nucleotide sequence homology with Bombyx mori nuclear polyhedrosis virus (BmNPV) IE1 gene, was isolated and cloned into pBluescript. Neomycin gene from pKO-neo was inserted under the control of the IE1 promoter to yield pAcIE1-neo. The plasmid pAcIE1-neo was transfected into Bm5 or Sf9 cells, and neomycin-resistant cells were selected in TC100 medium containing 10% fetal bovine serum (FBS) and 1 mg/ml G4l8 for two weeks. Individual clones were picked and each was amplified for further characterization. The genomic DNA from neomycin-resistant cells was isolated and characterized by PCR using AcNPV IEI gene-specific primers and by Southern blot analysis using neomycin gene probe. We concluded that AcNPV IE1 gene was functional in B. mori-derived Bm5 cells as well as Spodoptera fugjprrda-derived Sf9 cells to produce stably-transformed insect cells
Cho, Jeong-Rae,Cho, Keunhee,Park, Sung Yong,Kim, Sung Tae,Kim, Byung-Suk Canadian Science Publishing 2010 Canadian journal of civil engineering Vol.37 No.5
<P> This study examined the effect of aggregate size and density on the shear and tensile bond characteristics of the coarse sand coated interface between stay-in-place fibre-reinforced polymer (FRP) formwork and concrete. Shear and tension tests were performed for five test variables according to aggregate size and density. Based on the test results, the appropriate size and distribution density of the aggregates is examined. In addition, based on the shear test results, the local shear bond stress-slip model for each of the test variables was derived through an optimization process. </P>
A Study on Breeding Ecology of Oystercatcher (Haematopus ostralegus) at Yubu Island
Sang-Duck Lee,Sun-Gyeum Kim,Sun-Ho No,Heui-Young Kang,Chung-Yeol Baek,Sam-Rae Cho 한국조류학회II 2014 한국조류학회지 Vol.21 No.2
A survey of the breeding ecology of Oystercatcher (Haematopus ostralegus) inhabiting in the Youbu Island was conducted from February to August 2006. The maximum number of Oystercatcher was 2,500 in February and the minimum 150 in July. The nests had outer diameter of 191.7±6.14 mm, inner diameter of 127.3±3.90 mm, depth of 34.2±16.2 mm, and had far from high tide of 617.2±302.0 cm. The laying of eggs starts at the early April with average incubation of 29 days. The total number of eggs laid was 168, and the clutch size was 2.47±0.89. The eggs had a major axis of 57.51±0.06 mm, minor axis of 39.15±0.34 mm, and the weight was 44.30±0.26 g. The hatching success rate among 168 eggs was 78.6% (132 eggs), and the fledgling success rate was 9.8% (13 eggs). During the period of study, there were disturbance factors on 105 occasions and it was accounted for 54.3% by other birds, 14.3% by fishermen, 10.5% by fish boat and 20.9% by other causes.
Comparison of Spermatozoa Recovery Methods on Cauda Epididymal Sperm of Hanwoo Bulls
Sung-Sik Kang,Ui-Hyung Kim,Min-Hyeong Jeon,Myung-Suk Lee,Sang-Rae Cho 한국수정란이식학회 2018 한국동물생명공학회지 Vol.33 No.4
In this study, two epididymal spermatozoa recovery methods in relation to sperm number, motility, viability and acrosome reaction were examined. Seven bulls were castrated and 7 testicles with epididymides were transferred to the laboratoy. Epididymis in each bull was randomly used for flushing and mincing methods with semen extender (Optixcell, IMV, France). The recovered spermatozoa with adjusted sperm concentration to 40 × 106 cells/mL was diluted with optixcell and cryopreserved. In experiment 1, the difference in the total number of spermatozoa using flushing and mincing methods was insignificant (2570.0 and 2505.2 × 106 cells/mL, respectively). For experiment 2, the percentage of motile spermatozoa and motility parameters between flushing and mincing methods were studied through the use of sperm class analyzer after frozen-thawing. The percentage of total motile sperm between flushing and mincing methods was almost the same with 89.5±12.8 and 91.4±7.9%, respectively. The same is the case with experiment 3 wherein the viability and acrosomal integrity of frozen-thawed epididymal spermatozoa by flushing and mincing was insignificantly different. The results from the study showed that both flushing and mincing methods can be used for epididymal spermatozoa recovery in bull.
Cho, Sang-Rae,Kim, Ui-Hyung,Kumar, Kuldeep,Lee, Seung-Hwan,Lee, Myeung-Sik,Kim, Hyeon-Shup,Lee, Hyun-Jae,Yang, Byoung-Chul The Korean Society of Embryo Transfer 2014 한국동물생명공학회지 Vol.29 No.4
The objective of this study was to investigate the interrelationship of weight and hormonal changes through the administration of vitamin A to first time pregnant heifers. A total of 28 Korean heifers was used for this study. The heifers were divided into two groups - with vitamin A (n=14) and without vitamin A (control) (n=14) in the feed. Body weight increased in vitamin A treated heifers starting 9 months until 15 months. After pregnancy, vitamin A treated heifers were found to maintain higher body weights than the control group. Pre-pregnancy and post pregnancy progesterone levels were not different between the two groups. Serum estradiol levels of heifers at different growth stages showed relatively higher E2 levels than the control. Also, the control during pregnancy may show higher serum E2 levels than the vitamin A treated heifers. The growth phase serum estradiol levels in heifers may be relatively higher than the control. During pregnancy it showed a similar trend. Serum levels of vitamin A treated heifers did not differ from pregnant heifers at 5 months of age. However, after 5 months from conception until 8 months of treatment it showed a high level. Serum cholesterol in pregnant cows was higher in the control group than the treatment from beginning until the end of pregnancy. This is considered to be related to fetus development during pregnancy, as well as the mother's health.