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산양의 수정란 이식 및 조작기법 개발에 관한 연구 5 . 생쥐 및 산양 분할 수정란의 생존성 및 이식 후 수태율의 향상
박충생(C . S . Park),최상용(S . Y . Choe),이효종(H . J . Lee),이지삼(J . S . Lee),박희성(H . S . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.5
This experiment was conducted to compare different procedures for improvement of viability of embryos after bisection and to investigate some factors affecting development of the bisected embryos. Demi-embryos were successfully produced by micromanipulation of mouse and goat embryos at stages from morula to blastocyst. In mouse, a superior viability(90%) of demi-embryos was achieved by culturing expanded blastocysts after bisection. The highest pregnancy rate(57.1%) and implantation rate(28.2%), which were almost same as the rates of intact embryos. were also achieved by transferring the demi-embryos at this stage after culture for 24 h in vitro. Twenty -eight 3%) of 30 embryos collected from superovulated Korean native goats were successfully bisected, of them 23 demi-pairs were transferred to recipients. Six and 3 does of them were diagnosed pregnant on 21 and 60 days of gestation, respectively. The present result indicates that in goat, hatched blastocysts might be more suitable for successful bisection to produce monozygotic twins than morulae or earlier blastocysts.
노면굴곡형상 측정용 트레일러설계를 위한 조향특성에 관한 연구
김형윤(H.Y.Kim),이효종(H.J.Lee) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The special trailor for measuring the paved and unpaved road profiles is designed to instaneously obtain the power spectral and coherecy of the<br/> right and left vehicle tracks. In this study, we find and determine the design prameters of the steering radius and dynamics of the trailor towed<br/> by a vehicle. The equations of the trailor steering dynamics where we use the exponential function in relation of tire slip angle and conering force is calculated numerically, and the vertical load of wheels and<br/> drawing force is reviewed.<br/>
소의 Immunoglobulin G1 에 대한 단 Clone 성 항체의 생산에 관한 연구 2 . 소의 Immunoglobulin G1 에 대한 단 clone 성 항체의 생산
김정우,여상건,이효종 ( J . W . Kim,S . G . Yeo,H . J . Lee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.12
Spleen cells from Balb/c mice immunized with bovine IgG1 heavy chain were successfully fused with SP2/0 mouse myeloma cells and culture fluid of the hybrid cells were tested for specificity by enzyme-linkers immunosorbent assay. Of 48 initial hybrid clones, 21 produced antibodies to bovine IgG1. After cloning and rectoning, 2 (G1D2, G1H12) of these hybrid clones retained specificity and were grown in mass culture. The monoclonal (anti-bovine IgG1) antibody G1D2 and G1H12 were reacted to bovine IgG1 specifically in their dilution of more than 100- and 10-folds, respectively.
생쥐 8- 세포기 수정란의 핵이식에 의한 복제산자의 생산
최상용(S . Y . Choe),박희성(H . S . Park),이효종(H . J . Lee),박충생(C . S . Park) 한국축산학회 1992 한국축산학회지 Vol.34 No.2
The present study was carried out to develop a technology of cloning mammalian embryos using mouse embryos as a model and to produce cloned offsprings by transfer of reconstituted embryos to recipient females. Single nucleus from eight-cell embryos was transplanted into the enucleated two-cell embryos by micromanipulation and Sendai virus-mediated fusion. The fusion of nuclei with recipient cytoplasm and the development of reconsitituted embryos in vitro as well as in vivo were examined. The results obtained were summarized as follows: A total of 95(59.3%) nuclei from 20 donor embryos of 8-cell stage was injected successfully into the enucleated 2-cell recipient embryos, of which octa-. hepta-, hexa-, penta- and quadruplets were 0. 2, 3, 3 and 12 sets, respectively. The success in nuclei injection was lower(P$lt;0.05) from 8-cell donor embryos than 4-cell or 2-cell donor embryos. Among the embryos injected with nuclei a total of 81(85.2%) embryos were fused successfully with donor embryos of 8-cell stage. From donor embryos of 8-cell stage, 2 hexa-, 2 penta-, 11 quadru- and 5 triplets were fused successfully. A total of 46(39.l%) reconstituted embryos from 8-cell donor nuclei were developed in vitro to blastocysts, of which penta-, quadru- and triplets. twins and singles were 1, 2, 6, 6 and 3 sets, respectively. The development in vitro to blastocysts of the reconstituted embryos was lower (P$lt;0.05) from 8-cell donor embryos than 4- or 2-cell donor embryos. A total of 13(27.l%) cloned live youngs from transfer of cloned embryos using 8-cell donor embryos were produced, of which triplets, twins and singles were 2, 3 and 1 sets, respectively. The percentage of cloned youngs produced from transfer of cloned embryos using 8-cell donor embryos was lower(P$lt;0.05) than 4- or 2-cell donor embryos. The mean number of cloned live youngs produced per 8-cell donor embryo used for nuclei transplantation was 0.81.
산양의 수정란 이식 및 조작기법 개발에 관한 연구 3 . PMSG 와 FSH 를 이용한 산양의 과배란 유기
박충생(C . S . Park),최상용(S . Y . Choe),이효종(H . J . Lee),이지삼(J . S . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.4
This study was conducted to investigate the effects of PMSG or FSH treatment with PGF₂α to induce superovulation in Korean native goats. Does were treated with a single s.c. injection of 1,000 IU PMSG on Day 12 or twice daily s.c. injections of a total of 20 ㎎ FSH in decreasing doses over 4 days beginning on Day 12 of the estrous cycle, Estrus was induced by a single i.m. injection of 10 ㎎ PGF₂α 48 hours after the first gonadotropins injection. The does in estrus were mated with intact bucks twice daily 12 hours apart. Ovarian responses and embryo development were observed by laparotomv 72 hours after mating. Mean interval from PGF₂α injection to onset of estrus was significantly(p$lt;0.01) shorter (45.2±7.5 hours) in FSH group than ill PMSG group(64.8±9.6 hours). Duration of estrus, length of estrous cycle and the incidence of short estrous cycle following superovulation were not significantly different between the 2 treatment groups. The mean number of corpora lutea(P$lt;0.01) and ma recovered(P$lt;0.05) were significantly greater for FSH group(13.2 and 9.2) than for PMSG group(5.1 and 3.5). The mean number of trans-ferable embryos kva, 5.9 and 1.9 in FSH-treated and PMSG-treated group. respectively. These results indicate that FSH treatment with PGF₂α could be superior to PMSG treatment with PGF₂α for the induction of superovulation in Korean native goats.
산양의 수정란 이식 및 조작기법 개발에 관한 연구 Ⅰ. 산양의 발정유기 및 동기화에 관하여
박충생(C . S . Park),최상용(S . Y . Choe),이효종(H . J . Lee),이지삼(J . S . Lee) 한국축산학회 1989 한국축산학회지 Vol.31 No.1
This experiment was conducted to find out an efficient method for estrus induction and synchronization in goats. Sixty of 83 pluriparous Korean native goats received a single i.m. injection of 3㎎ PGF2α on Days 3 to 12 of the estrous cycle. Remained 23 goats received twice daily i.m. injection of 5㎎ progesterone for 6 or 7 days and a single i. m. injection of 3㎎ PGF2α 1 day before the last injection of progesterone. Serum progesterone concentrations were analyzed by RIA. A single intramuscular injection of 3㎎ prostaglandin F2α(PGE2α) on Days 5 to 12 of the estrous cycle induced estrus in 96% of 50 goats treated, but this treatment on Day 3 to 4 was not effective. Estrus was induced in all of 23 goats injected 3㎎ PGF 2αi.m. 24 hours before the last one of successive injections of 5mg progesterone for 6 or 7 days. The onset of estrus was significantly(P$lt;0.01) earlier in PGF 2α treated goats during Days 5 to 6 of the estrous cycle than those treated on Days 7 to 12. PGF 2α treatment with progesterone delayed significantly (P$lt;0.01) the onset of returning to estrus, compared with the PGF2α injection only during mid-luteal phase of the cycle. Serum progesterone concentration was decreased to a nadir at 24 hours following PGF2α administration on Days 5 to 8 of the cycle, but increased to 2.39±0.66 to 2.69±0.56ng / ml at 48 hours after PGF2α injection on Days 3 to 4. Incidence of short estrous cycle following estrus synchronization by PGF2α with or without progesterone was 26.1 % and 26.0 %, respectively. More effective synchronization of estrus was feasible by progesterone treatment for 6 or 7 days plus PGF2α injection 24 hours prior to the last progesterone administration, compared with a single intramuscular injection of 3㎎ PGF2α alone.