• The Korean Journal of Zoology
• /
• v.34 no.3
• /
• pp.389-393
• /
• 1991

To obtain monozygotic multiplets from 8-cell mouse embryos, we artificially constructed chimeric embryos by introducing one blastomere (donor) of 8-cell embryos of Fl hybrid (C57BL/6 X CBA) mice into 4-cell ICR mouse embryos (carrier) of which one blastomere had been previously removed with a micromanipulator. After 42 h of culture, the developmental frequency of chimeric embryos to normal morula and blastocyst was 95% (310/328). When chimeric embryos at morula or blastocvst stage were transferred to pseudopregnant mice,39%, (70/180) of them were born. Most of the offspring (56/70) were the carrier type in coat color, whereas only three of them were the donor type, of which ho were assumed to be derived from single 8-cell donor embryo. Because the two donor type mice Ivere the same sex and produced only the donor type offspring from a testcross, they are probably monozvgotic multiplets of 8-cell mouse embryos. However, since their internal chimerism was not able to be examined, it remains to be determined if their genetic constitutions are identical.

• Progress in Medical Physics
• /
• v.23 no.2
• /
• pp.114-122
• /
• 2012

For the determination of absorbed dose to water from a linear accelerator photon beams, it needs a exposure calibration factor $N_x$ or air kerma calibration factor $N_k$ of air ionization chamber. We used the exposure calibration factor $N_x$ to find the absorbed dose calibration factors of water in a reference source through the TG-21 and TRS-277 protocol. TG-21 used for determine the absorbed dose in accuracy, but it required complex calculations including the chamber dependent factors. The authors obtained the absorbed dose calibration factor $N_{dw}{^{Co-60}}$ for reduce the complex calculations with unknown $N_{dw}$ only with $N_x$ or $N_k$ calibration factor in a TM31010 (S/N 1055, 1057) ionization chambers. The results showed the uncertainty of calculated $N_{dw}$ of IC-15 which was known the $N_x$ and $N_{dw}$ is within -0.6% in TG-21, but 1.0% in TRS-277. and TM31010 was compared the $N_{dw}$ of SSDL to that of PSDL as shown the 0.4%, -2.8% uncertainty, respectively. The authors experimented with good agreement the calculated $N_{dw}$ is reliable for cross check the discrepancy of the calibration factor with unknown that of TM31010 and IC-15 chamber.

• Bulletin of the Korean Chemical Society
• /
• v.33 no.8
• /
• pp.2703-2706
• /
• 2012

New C60 fullerenes derivatives [G1]-C60 (1) and [G2]-C60 (2) comprising of phenylenevinylene bridges and phenylquinoline peripheral surface groups were synthesized by 1,3-dipolar cycloaddition reaction of fullerene C60 with azomethine ylide in situ generated from [Gx]-CHO dendrons (x = 1 and 2) and sarcosine.

• Bulletin of the Korean Chemical Society
• /
• v.29 no.8
• /
• pp.1572-1574
• /
• 2008

• Journal of Chest Surgery
• /
• v.23 no.2
• /
• pp.366-369
• /
• 1990

Primary choriocarcinoma of the lung is extremely rare. The patient was 28-year-old female and had no specific signs and symptoms except right chest pain for 5 years. On simple chest film, 8X8 cm sized, well demarcated, homogeneous ovoid mass was found on right lower lung field. The qualitative urine \ulcorner-HCG was 17140 mIU/ml. The result of percutaneous needle biopsy highly suggested choriocarcinoma. Under the impression of primary choriocarcinoma of the lung, right middle and lower lobectomy was done. On 33 postoperative days, serum \ulcorner-HCG level was within normal limit, the patient was discharged without complications after one-cycle chemotherapy.

• Journal of Biomedical Engineering Research
• /
• v.2 no.1
• /
• pp.39-46
• /
• 1981

Microstructural phases of the dental amalgams have been studied by optical microscope, scanning electron microprobe and X-ray diffractometer. r1 ($Ag_2Hg_3$) phase and r2 ($Sn_{7-8}Hg$) phase are found on conventional compositioned alloys. On high copper single compositioned alloy, rl ($Ag_2Hg_3$) phase and V ($Cu_6Sn_5$) phase are found but brittle r2 ($Sn_(7-8)Hg$) phase.

• Bulletin of the Korean Chemical Society
• /
• v.32 no.8
• /
• pp.2761-2764
• /
• 2011

A new Ruddlesden-Popper phase $NdSr_2MnCrO_7$ has been prepared by the standard ceramic method. The powder X-ray diffraction studies suggest that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. The electrical transport properties show that the phase is an electrical insulator and the electrical conduction in the phase occurs by a 3D variable range hopping mechanism. The magnetic studies suggest that the ferromagnetic interactions are dominant.

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 1986.10a
• /
• pp.8-11
• /
• 1986

Data acquisition system is needed in signal analysis and processing by using computer. This paper realizes the high speed data acquisition system by using 8bit, 20MHZ refresh A/D converter and 18 x 64 Byte high speed memory. The high speed data acquisition system provides converted data to IBM-PC XT micro computer.

• Bulletin of Food Technology
• /
• v.9 no.4
• /
• pp.119-123
• /
• 1996

필자들은 96년 8월 19일부터 8월 25일까지 6박 7일간 중국의 상해와 광주에 있는 식품연구소와 업체를 방문하여 중국내 최근연구현황 조사 및 연구과제를 탐색하였다. 또한 홍콩에서 개최된 제7차 Food Expo에 참석하여 식품에 관련된 신제품의 개발 현황을 살펴보았다. 수집한 정보중 싱해에서 발간된 95년도 중국식품공업지(ISSN 1004-471X)에 나타난 주요 제목을 분야별로 나누어 언급하고자 하며, 식품공업지의 권, 호와 페이지를 생략했음을 양지하여 주길 바라는 마음이다.

• Bulletin of the Korean Chemical Society
• /
• v.27 no.8
• /
• pp.1227-1230
• /
• 2006