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소의 受精卵 移植에 관한 硏究 : II. 性成熟 過程의 처녀우의 多排卵 誘起와 受胎에 관한 硏究
任京淳,李用斌,鄭丘敏,金鍾國 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
This experiment was carried out to investigate the effects of superovulation on the ovarian response and embryo production of young and matured heifers. The possibility of mon-surgical recovery from the young heifers and transfer of recovered embryos to the mature recipients was also investigated. A total of 8 heifers(5 heads of Holstein, 2 Heads of Korean Native Cattle(KNC)and one head of Angus×Hereford crossbreed)were devided into 2 groups by their age. Young heifers(Group I)were 7∼10 months old and mature heifers(Group II)were 12∼18 months old. Group I and II were superovulated with muscular injection of 1,000 or 2,000 IU Pregnant Mare's Serum Gonadotrophin(PMSG)on day 10∼12 of estrus cycle followed by muscular injecion of 25mg Prostaglandin F ₂α(PGF₂α) 48 hours later. Heifers were artificially inseminated or copulated 2∼3 times with the interval of 12 hours while they were in heat. The embryos were collected non-surgically on day 6 of estrus cycle. The results obtained from this study were summarized as follows: 1. The average number of corpus lutea(CL) by the superovulation treatment was much greater in Group 11(9.2)than in Group 1(3.2) 2. The average number of unruptured follicles by the superovulation treatment was much greater in Group II(6.8)than Group I(1.0) 3. The interval to onset of estrus after PGF₂αinjection was longer in Group I(44.2 hours)than in Group II(31.8 hours).
Relative volume comparison with integral
Jong-Gug Yun 대한수학회 2004 대한수학회보 Vol.41 No.2
In this paper, we generalize the Bishop-Gromov volume comparisontheorem by considering an integral bound for the part of theradial Ricci curvature which lies below a given smooth function.We also establish a compactness theorem from this result.
On the geometry of Lorentz spaces as a limit space
Jong-Gug Yun 대한수학회 2014 대한수학회보 Vol.51 No.4
In this paper, we prove that there is no branch point in the Lorentz space (M, d) which is the limit space of a sequence {(Mα, dα)} of compact globally hyperbolic interpolating spacetimes with C± -properties and curvature bounded below. Using this, we also obtain that every max- imal timelike geodesic in the limit space (M, d) can be expressed as the limit curve of a sequence of maximal timelike geodesics in {(Mα, dα)}. Finally, we show that the limit space (M, d) satisfies a timelike trian- gle comparison property which is analogous to the case of Alexandrov curvature bounds in length spaces.
Hae-Lee Lee,Jae-Hee Park,Yong-Su Kim,Jong Gug Kim 韓國受精卵移植學會 2013 한국동물생명공학회지 Vol.28 No.1
This study examined the motility of either the unattached(upper) or attached(lower) Hanwoo sperm to bovine oviduct epithelial cell(BOEC) monolayers to determine whether there are any changes in their motility during co-culture. The cleavage and blastocyst development rate were compared among different preincubation methods in-vitro, after oocytes were fertilized in-vitro with Hanwoo sperm on BOEC monolayers. The motility of frozen-thawed sperm in BOEC co-culture group was significantly higher than controls, especially at 5 hours and 6 hours (p<0.05) of incubation, in sperm treatment medium without heparin and caffeine. The motility of frozen-thawed sperm in BOEC co-culture group was significantly higher than controls, especially at 3 hours (p<0.05) and 6 hours (p<0.01), in sperm treatment medium containing heparin and caffeine. The motility of the attached( lower) sperm was significantly higher than the unattached(upper) sperm during co-culture with BOEC at all times(p<0.01 or p<0.05), except for 6 hours. After Hanwoo oocytes were fertilized in-vitro with the sperm that had been co-cultured with BOEC in sperm treatment medium containing heparin and caffeine, we determined the cleavage and blastocyst development rate, according to the preincubation methods. Both the cleavage and blastocyst development rate from 2 hour preincubation group were the highest, but significant difference was not recognized. These results show that BOEC plays an important role on sperm hyperactivation related to capacitation regardless of heparin and caffeine in sperm treatment medium. However, oviduct epithelial cell had no significant effect on the development of embryos after in-vitro fertilization in the presence of added heparin and caffeine in sperm treatment medium.
A note on the generalized Myers theorem
Jong-Gug Yun 대한수학회 2009 대한수학회보 Vol.46 No.1
We provide a generalized Myers theorem under integral curvature bound and use this result to obtain a closure theorem in general relativity. We provide a generalized Myers theorem under integral curvature bound and use this result to obtain a closure theorem in general relativity.
A GENERALIZATION OF THE LORENTZIAN SPLITTING THEOREM
Yun, Jong-Gug Korean Mathematical Society 2012 대한수학회보 Vol.49 No.3
In this paper, we obtain a generalized Lorentzian splitting theorem by weakening the assumption of nonnegative Ricci curvature.
RELATIVE VOLUME COMPARISON WITH INTEGRAL RADIAL CURVATURE BOUNDS
Yun, Jong-Gug Korean Mathematical Society 2004 대한수학회보 Vol.41 No.2
In this paper, we generalize the Bishop-Gromov volume comparison theorem by considering an integral bound for the part of the radial Ricci curvature which lies below a given smooth function. We also establish a compactness theorem from this result.
A NOTE ON THE GENERALIZED MYERS THEOREM
Yun, Jong-Gug Korean Mathematical Society 2009 대한수학회보 Vol.46 No.1
We provide a generalized Myers theorem under integral curvature bound and use this result to obtain a closure theorem in general relativity.