• 한국포장학회지
• /
• 제5권2호
• /
• pp.1-8
• /
• 1999

The state of compatability of poly(vinyl alcohol)(PVA) and methyl cellulose(MC), prepared by an aqueous solution casting, were investigated over the entire compositions by dynamical mechanical analyzer(DMA) and differential scanning calorimetry(DSC). The glass transition temperatures of the blends, estimated by DMA, indicate that the blends of PVA and MC showed a definite degree of partial miscibility by showing two glass transition temperatures below 80 wt % MC contents in the blends and one glass transition temperature above 80 wt % of MC contents. The DSC results show a depression of melting point and crystallization temperature of PVA in the blends containing more than 80 wt % MC. This indicates that a considerable compatibility in the blend above 80 wt % MC contents may be attribute to the presence of interaction of hydroxyl groups of component polymers through hydrogen bonding. The DMA study of the effect of plasticizer on the polymers showed that water was a good plasticizer for PVA and PEG400 for MC. The addition of water and PEG400 in the blends showed a synergic plasticizing effect on these blends, which resulted in the large extent of the improvement of the compatibility. The elongation of PVA, MC and blonds was found to increase with addition of PEG400 in the blends, but the tensile strength to decrease with addition of plasticizer.

• 대한수의학회지
• /
• 제38권1호
• /
• pp.161-166
• /
• 1998

Fasciola hepatica eggs were obtained from the bile of infected cattle at a local abattoir. Metacercariae(MC) were produced using Lymnaea viridis, the intermediate host of the parasite. They were stored in distilled water at refrigerator($3{\sim}5^{\circ}C$) and at room temperature($22{\sim}27^{\circ}C$). The viability and infectivity of the MC were determined at monthly intervals for 12 months. The viability was determined by both microscope and excystation, and the infectivity by infecting mice. The MC stored at room temperature had a high viability up until 60 days, and thereafter the viability declined rapidly ; at day 120, only 2.5% of the MC were excysted. Most of the MC stored at refrigerator retained the viability up until 90 days, and thereafter the viability declined slowly ; about half of them were viable at day 210 and 5% of them retained the viability until day 270. The survival rates of the MC determined by microscope were always higher than those determined by excystation(p<0.05). The infectivity of the MC wisely followed the viability at the two different storage temperatures. Most of the mice infected orally with the MC died within 3-9 weeks of acute fasciolosis.

• 한국자원식물학회지
• /
• 제24권6호
• /
• pp.696-701
• /
• 2011

The aim of this field experiment was to investigate the possible effects of mepiquat chloride (TE) and trinexapac-ethyl (MC) on oil composition, seed yield and endogenous gibberellins content of flax cultivar. Foliar application of plant growth retardants mepiquat chloride (0.897, 1.794 and 2.691 kg a.i. $ha^{-1}$) and trinexapac-ethyl (0.756, 1.512 and 2.668 kg a.i. $ha^{-1}$) had significantly increased seeds ripening rate and seed yield. In contrast, plant height was decreased by foliar application of MC and TE. The application of MC significantly increased seed oil yield (730 kg $ha^{-1}$ by 27.0%) compared to the control. Seed and oil yield, and unsaturated fatty acids (oleic acid, linoleic acid and linolenic acid) were increased by foliar application of MC.

• Journal of Periodontal and Implant Science
• /
• 제27권4호
• /
• pp.669-684
• /
• 1997

Polypeptide growth factors belong to a class of potent biologic mediators which regulate cell differentiation, proliferation, migration and metabolism. IGF-I is polypeptides secreted by skeletal cells and is considered as regulators of bone formation. The purpose of this study is to evaluate the effects of IGF-I on bone nodule formation and alkaline phosphatase activity of MC3T3-E1 cells. MC3T3-E1 cells were seeded at $1{\times}10^4$ cells/well, $1{\times}10^5$ cells/well in alpha-modified Eagle medium containing 10% fetal bovine serum, 10 mM ${\beta}-glycerophosphate$ and $5O{\mu}g/ml$ of ascorbic acid. Before 48 hours of indicated time, medium were changed with serum free medium. After 24 hours, 0.1, 1, 10 ng/ml IGF-I were added to the cells and cultured for 3, 7, 14, 21, 28 days. And histochemical analysis was done and ALP activity was measured and was expressed as nmol/min/mg of protein. The bone nodule formation in MC3T3-E1 cells of IGF-I was seen at 21, 28 days, but there were no difference between control group and experimental groups. The ALP activity decreased when it is compare to control 2 group except for 1 ng/ml, 10 ng/ml IGF-I of 21-day-groups and 1 ng/ml IGF-I of 28-day-groups. Dose response effects of IGF-I of ALP activity in MC3T3-E1 cells were seen the highest ALP activity at 1ng/ml until 21days and the highest ALP activity at 10 ng/ml of 28 daygroups. The peak times were seen at 7-day group, 14-day group on control group and experimental group respectively, and 1 ng/ml group was the highest ALP activity, From the above results, IGF-I was not seen notable effect on bone nodule formation and decreased ALP activity of MC3T3-E1 cells but the use of IGF-I to mediate biological stimulation of MC3T3-E1 cells shows promise for future therapeutic application.

• Childhood Kidney Diseases
• /
• 제3권2호
• /
• pp.237-240
• /
• 1999

The presence of polyostotic fibrous dysplasia of bone, hyperpigmented skin macules, and precocious sexual development in children is known as the McCune-Albright syndrome. In addition to the described in McCune-Albright syndrome, other endocrinopathies have been reported including hyperthyroidism, acromegaly, Cushing syndrome and vitamin D resistant rickets. The case describes a 6-year-old boy showing bony deformities due to polyostotic fibrous dysplasia, hyperpigmented skin macules, hyperthyroidism and vitamin D resistant rickets. The purpose of this report is to describe a patient of McCune-Albright syndrome with vitamin D resistant rickets which is very rare.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2003년도 춘계학술발표논문집 (중)
• /
• pp.1497-1500
• /
• 2003

본 논문에서는 나카가미 페이딩 채널하에서 MC DS/CDMA 방식에 FH 방식을 적용한 FH MC/DS CDMA 시스템의 성능을 분석하였다. 나카가미 페이딩 지수 m과 MRC 다이버시티의 브랜치 수 L이 증가할 때 호핑 횟수 1과 4에 대한 분석결과 약 2.8dB의 성능차이를 보이고 있음을 앞 수 있었다. 호핑 횟수의 증가는 주파수 다이버시티 효과를 가져옴으로써 FH MC DS/CDMA 시스템에서 수신측의 부담을 줄이면서 BER 성능을 향상시킬 수 있음을 의미하며 따라서 호핑 횟수를 증가시킴으로써 부담 MC/DS CDMA 시스템의 성능을 개선할 수 있음을 입증하였다.

• 한국위성정보통신학회논문지
• /
• 제5권1호
• /
• pp.94-99
• /
• 2010

In this paper, we discuss a proposed two hop relay network with PB/MC-CDMA(partial block MC-CDMA) technique. The main advantages of PB/MC-CDMA system are the increased cell capacity and the high quality of performances. In the system, we employ relay scheme to focus on the coverage reduction and hotspot problem, hotspot is a location where a cluster of users are blocked or dropped for the reason of insufficient frequency resources. Frequency resource allocation scheme is put forward in a three cells system according to each problem. The simulation result shows the performance of the two hop transmission is better than the direct transmission and the proposed network can support much more users to relief hotspot effect compared to the conventional one.

• 미국학
• /
• 제32권1호
• /
• pp.169-198
• /
• 2009

Unlike the Democratic nomination, Republican nomination struggle has ended with an easy victory of Senator John McCain. This paper claims that the easy victory of McCain should not be interpreted as Republican's return to the median voter, because it masks religious schism and ideological discord among the Republicans. Christian rights were still reluctant to support McCain mostly due to his liberal position on social issues. In addition, the conservatives who request stricter immigration policy presented the mixed feeling toward the Republican candidate. Even though McCain chose the harmony inside the Republican party, rather than sticked to his liberal attitude toward social issues during the campaign for 2008 general election, McCain's defeat is unlikely to result in a rapid change in the Republican party.

• Journal of Microbiology and Biotechnology
• /
• 제22권2호
• /
• pp.176-183
• /
• 2012

Eukaryotic translation termination is governed by eRF1 and eRF3. eRF1 recognizes the stop codons and then hydrolyzes peptidyl-tRNA. eRF3, which facilitates the termination process, belongs to the GTPase superfamily. In this study, the effect of the MC domain of eRF1a (eRF1aMC) on the GTPase activity of eRF3 was analyzed using fluorescence spectra and high-performance liquid chromatography. The results indicated eRF1aMC promotes the GTPase activity of eRF3, which is similar to the role of eRF1a. Furthermore, the increased affinity of eRF3 for GTP induced by eRF1aMC was dependent on the concentration of $Mg^{2+}$. Changes in the secondary structure of eRF3C after binding GTP/GDP were detected by CD spectroscopy. The results revealed changes of conformation during formation of the eRF3C GTP complex that were detected in the presence of eRF1a or eRF1aMC. The conformations of the eRF3C eRF1a GTP and eRF3C eRF1aMC GTP complexes were further altered upon the addition of $Mg^{2+}$. By contrast, there was no change in the conformation of GTP bound to free eRF3C or the eRF3C eRF1aN complex. These results suggest that alterations in the conformation of GTP bound to eRF3 is dependent on eRF1a and $Mg^{2+}$, whereas the MC domain of eRF1a is responsible for the change in the conformation of GTP bound to eRF3 in Euplotes octocarinatus.

• 한국통신학회논문지
• /
• 제24권10A호
• /
• pp.1471-1479
• /
• 1999

이 논문에서는 적응 배열 안테나를 갖는 MC-CDMA를 위한 적응 빔 형성 알고리듬을 제안한다. 다중경로 페이딩에 robust하고 간단히 단일 탭 등화기를 사용하여 고속 데이터 전송에 적합한 것으로 알려진 MC-CDMA 시스템의 수신단에 안테나 배열을 사용함으로서 그 성능을 크게 개선할 수 있음을 보인다. 본 논문에서 제안된 MC-CDMA 시스템의 적응 빔 형성 알고리듬은 원하는 사용자의 파이롯 심벌(기준신호)과 수신된 파이롯 신호의 오차를 주파수 영역에서 계산하고, 그 주파수 영역 오차신호를 시간영역 오차 신호로 변환한 후, MSE가 최소가 되는 방향으로 적응 빔 형성기의 계수를 갱신하므로서 유도된다. 모의 실험과 해석적 방법을 통하여 MC-CDMA 시스템에 제안된 적응 빔 형성기법을 적용할 경우 수렴특성과 성능개선 효과를 확인한다.