• 제목/요약/키워드: AGG

검색결과 51건 처리시간 0.027초

생체모방계에 의한 시클로헥산 산화반응에서 리간드의 영향 (Influence of Ligand on Oxidation of Cyclohexane in the Biomimetic System)

  • 김성보
    • Korean Chemical Engineering Research
    • /
    • 제43권2호
    • /
    • pp.202-205
    • /
    • 2005
  • GoAgg 생체모방계 산화반응시스템을 이용하여 상온, 상압에서 시크로헥산을 산화 반응하여 시크로헥산올과 시클로헥산온 제조를 위한 연구를 수행하였다. 반응속도론적 연구를 수행하였으며 리간드로 카르복실기를 포함하는 picolinic acid를 사용한 경우 철 촉매만 사용한 경우에 비해 15배 이상의 활성이 증가하였다. 특히 피리딘환이나 이미다졸환에 ortho 위치에 카르복실기를 포함한 경우 meta, para 위치보다 반응성이 크게 증가하였다. 이 결과로부터 새로운 매커니즘을 제안하였다.

Carrier screening for (CGG)n repeat expansion of FMR1 gene in Korean women

  • Kang, Kyung Min;Sung, Se Ra;Park, Ji Eun;Shin, Yun Jeong;Park, Sang Hee;Chin, Mi Uk;Lyu, Sang Woo;Cha, Dong Hyun;Shim, Sung Han
    • Journal of Genetic Medicine
    • /
    • 제13권1호
    • /
    • pp.14-19
    • /
    • 2016
  • Purpose: We examined the prevalence and CGG/AGG repeat structure of expanded alleles of the FMR1 gene in preconceptional and pregnant Korean women. Materials and Methods: The CGG repeats in the FMR1 genes of 1,408 women were analyzed by polymerase chain reaction and Southern blot analysis. To estimate the prevalence of expansion alleles, the individuals were divided into low risk and high risk group. Results: Within this population, 98.4% had normal alleles and 1.6% had abnormal alleles including intermediate (0.6%), premutation (0.5%), full mutation (0.1%), and hemizygous (0.4%) alleles. There were 2 premutation alleles (1:666, 95% confidence interval [CI] 1:250-1,776) in the low risk group and 5 premutation alleles (1:15, 95% 1:6-36) in the high risk group. There were 8 intermediate alleles (1:167, 95% CI 1:130-213) in the low risk group and 1 intermediate alleles (1:76, 95% CI 1:11-533) in the high group. Six of the 7 premutation alleles did not contain AGG interruptions within the repeats and 1 had a single AGG interruption. Four of the 9 intermediate alleles contained 2-3 AGG, 4 had a single AGG, and 1 had no AGG interruptions. Conclusion: Our study demonstrates the prevalence and CGG/AGG structure of expansion alleles in Korean women. The identified premutation prevalence is higher than that of other Asian populations and lower than that of Caucasian populations. Although our study is limited by size and population bias, our findings could prove useful for genetic counseling of preconceptional or pregnant women.

Synthesis of Aesculetin and Aesculin Glycosides Using Engineered Escherichia coli Expressing Neisseria polysaccharea Amylosucrase

  • Park, Soyoon;Moon, Keumok;Park, Cheon-Seok;Jung, Dong-Hyun;Cha, Jaeho
    • Journal of Microbiology and Biotechnology
    • /
    • 제28권4호
    • /
    • pp.566-570
    • /
    • 2018
  • Because glycosylation of aesculetin and its 6-glucoside, aesculin, enhances their biological activities and physicochemical properties, whole-cell biotransformation and enzymatic synthesis methodologies using Neisseria polysaccharea amylosucrase were compared to determine the optimal production method for glycoside derivatives. High-performance liquid chromatography analysis of reaction products revealed two glycosylated products (AGG1 and AGG2) when aesculin was used as an acceptor, and three products (AG1, AG2, and AG3) when using aesculetin. The whole-cell biotransformation production yields of the major transfer products for each acceptor (AGG1 and AG1) were 85% and 25%, respectively, compared with 68% and 14% for enzymatic synthesis. These results indicate that whole-cell biotransformation is more efficient than enzymatic synthesis for the production of glycoside derivatives.

A Role of Cell Adhesion Molecules and Gelatinases in Human Serum-Induced Aggregation of Human Eyelid-Derived Stem Cells In Vitro

  • Yang, Hyejin;Lim, Yoon Hwa;Yun, Sujin;Yoon, A Young;Kim, Haekwon
    • 한국발생생물학회지:발생과생식
    • /
    • 제17권4호
    • /
    • pp.409-420
    • /
    • 2013
  • Human serum (HS) has been reported to induce aggregation of human eyelid adipose-derived stem cells (HEACs) during high-density culture in vitro. The present study focused on the role of cell adhesion molecules and gelatinases during HS-induced aggregation of HEACs. HS-induced aggregation occurred between 9-15 days of culture. Cells aggregated by HS medium (HS-agg) showed stronger expression of ${\alpha}2$, ${\alpha}2B$, ${\alpha}X$, and CEACAM1 genes compared to non-aggregated cells in HS medium (HS-ex) or in control FBS-cultured cells. HS-agg were distinctly labeled with antibodies against ${\alpha}2$, ${\alpha}2B$, and ${\alpha}X$ proteins. Western blot results demonstrated that the two integrin proteins were greatly expressed in HS-agg compared to HS-ex and control FBS-cultured cells. Treatment of HEACs with anti-integrin ${\alpha}2$ antibody during culture in HS medium delayed aggregation formation. HS-agg exhibited strong expression of MMP1 and MMP9 compared to HS-ex or FBS-cultured cells. Conditioned media from HS-culture showed remarkable increase of MMP9 gelatinolytic activity in comparison to those from FBS-culture. However, there was no change of TIMP mRNA expression in relation to the HS-induced aggregation. Based on these results, it is suggested that integrin ${\alpha}2$, ${\alpha}2B$, and ${\alpha}X$, and MMP9 might play an important role in the HS-induced aggregation of HEACs.

Differentiated Service에서 공정한 자원 공유를 위한 WFQ 적용 TC 설계 (The Design of TC with WFQ for Effective Resource Sharing on Differentiated Service)

  • 장경성
    • 대한전자공학회논문지TC
    • /
    • 제41권2호
    • /
    • pp.31-40
    • /
    • 2004
  • Diff-Sew는 개별적으로 구분된 다른 트레픽에 대해서 다른 종류의 네트워크 서비스를 제공하기 위한 메카니즘이며 이용자들에게 양질의 서비스를 제공하기 위한 방법을 제시하고 있다. DS는 토큰 버켓 방법을 사용하여 고정된 호스트들에게 제공되기 때문에 이동성을 가지는 서비스나 개별적인 트레픽에 대한 차등적인 서비스를 제공할 방안이 존재하지 않는다 본 논문에서는 트래픽컨테이너(TC)를 위해서 WFQ 방법과 변방 노드들과 경계 라우터들 내부에서 제어가 가능한 AggF(Aggregate Flow)를 모니터링하여 스케쥴링하는 방법을 제시한다. 이 방법은 트래픽 비율(traffic rate)을 유동적으로 제어가 가능하며 대역폭의 효율적인 이용성을 제공하고 있다.

국내 Bordetella pertussis 분리균주에서 Agglutinogen과 Fimbriae 혈청형 변이 분석 (Serotype Variations of Agglutinogen and Fimbriae in the Korean Isolates of Bordetella pertussis)

  • 정상운;문유미;성화영;강연호;유재연
    • 미생물학회지
    • /
    • 제44권3호
    • /
    • pp.221-227
    • /
    • 2008
  • Bordetella pertussis는 유아의 호흡기감염질환인 백일해의 원인균으로 배신도입에 의해 발생률이 크게 낮아졌다. 그러나 최근에 일부 백신접종률이 높은 국가에서 증가된 백일해 발생건수가 보고되고 있으며, 그 추정 원인 중에 하나는 백신주와 유행주 사이의 유전형 흑은 혈청형 변이 이다. 따라서 분리주에 대한 변이 현황을 유전형 혹은 혈청형 분석을 통하여 확인하는 것이 필요하고 국내에서 백일해 발병증가에 대한 가능성을 추정해야 한다. 이에 본 연구에서는 $1999\sim2006$년 사이에 분리된 국내 백일해 분리균주의 변이 양상을 agglutinogen과 fimbriae에 대한 혈청형 조사를 통해 확인하였다. 그 결과 agg 1과 fim 2가 국내 분리주에서 가장 많이 발견되는 혈청형이었고, 두 항원 모두 시대에 따른 혈청형 변이 현상이 확인되었으며, 특히 agglutinogen의 경우는 백신균주(agg 1,2)와는 다른 유형(agg 1)이 증가되는 유형으로 나타났다. 그러나 fimbriae의 경우는 백신균주(fim 2)와 동일한 유형이 증가되어 차이를 나타내었다. 이러한 결과는 백일해 발병증가가 나타나는 국가들에서도 확인되는 현상으로 국내에서의 백일해 발병증가에 대한 보다 정확한 예측을 위해서는 항원결정기 유전자에 대한 변이정도 및 정상인에서의 항체가 분포양상 등에 대한 연구가 필요할 것으로 사료된다.

Egg Yolk Antibody and Its Application

  • Kim, Mujo;Shinji Higashiguchi;Yoshitomo Iwamoto;Yang, Han-Chul;Cho, hong-Yon;Hsjime Hatta
    • Biotechnology and Bioprocess Engineering:BBE
    • /
    • 제5권2호
    • /
    • pp.79-83
    • /
    • 2000
  • A han transfers her serum immunoglobulin G to the agg (IgY) and gives immunity to her offspring. Therefore, The hen agg can be an effective supplier of a large amount of antigen specific antibody that accumulates in the egg yolk. Antigen specific antibody has been widely used for immunological analysis in the field of diagnosis as well as pure scientific research. The production and separation technology of IgY is demonstrated in the present study.

  • PDF

트윈롤 주조 후 열간압연된 Mg-0.6wt.%Zn-0.6wt.%Ca 합금 판재의 열처리에 따른 결정립 성장 거동 (Grain Growth Behavior of Heat Treated Mg-0.6wt.%Zn-0.6wt.%Ca Alloy Sheet Manufactured via Twin Roll Casting and Hot Rolling)

  • 이희재;박노진
    • 열처리공학회지
    • /
    • 제35권2호
    • /
    • pp.74-81
    • /
    • 2022
  • This study aims to mitigate the microstructural heterogeneity arising from the manufacture of magnesium alloy plates using the twin roll casting (TRC) process. Homogenization was introduced through hot rolling and heat treatment, followed by confirmation of observed changes in the microstructure. Following the TRC process, the hot rolled 2mm plate exhibited a dendritic cast structure tilted in the roll rotation direction, while central segregation were developed. This nonuniform structure and central segregation disappeared upon heat treatment, followed by recrystallization to form uniform and fine grains. Abnormal grain growth (AGG) was observed over the course of heat treatment; grains exhibiting AGG occupied up to 75% of the total area after having held the sample at 400℃ for 64 h. The formation of coarse grains was also observed during heat treatment at 340℃ over a relatively long duration, though the maximum grain size was significantly smaller than that corresponding to the heat treatment at 400℃. AGG in the 400℃ heat treatment occurred because of movement of the grain boundary, which had been fixed prior as a result of the grain boundary fixing effect of the precipitation phase. The re-dissolution of the Ca2Mg5Zn5 precipitated phase over the long duration of the high-temperature annealing process caused the surrounding grains to disappear and regrow.

소매시장에서 판매하는 돼지고기와 닭고기에서 분리된 Escherichia coli의 병원성 인자 (Virulence Factor Profiles of Escherichia coli Isolated from Pork and Chicken Meats Obtained from Retail Markets)

  • 최선금;이민화;이복희;정지윤;최창순
    • 한국축산식품학회지
    • /
    • 제30권1호
    • /
    • pp.148-153
    • /
    • 2010
  • 시중에서 판매되는 계육과 돈육 가검물 1085개를 구입하고, 총 217개의 대장균 분리주를 확보하였다. 현재 알려진 대장균 병원성 인자 11개(astA, elt, estI, estII, cdt, cnf, eae, afa, stx, inve, aggR)의 보유여부를 PCR 기법으로 조사하였다. 돈육유래 대장균에서 존재하는 병원성 인자는 astA(6.9%), eae와 elt(4.6%), estII(4.0%), estI(2.3%), afa (1.1%), cnf(0.6%)의 순으로 검출되었으나, cdt, stx, aggR, inve는 검출되지 않았다. 계육에서 분리된 대장균 42개 중에서 astA와 inve를 보유하고 있는 병원성 대장균이 각각 1개씩 확인되었다. 특히 astA는 돈육과 계육에서 분리된 대장균 중에서 높은 빈도로 존재하고 있음을 확인하였으며, cnf와 afa같이 기존에 알려지지 않은 병원성 인자들의 존재도 확인되었다.