• 제목/요약/키워드: Dimer

검색결과 647건 처리시간 0.033초

가와사끼병에서 D-dimer의 임상적 응용 (Clinical application of D-dimer in Kawasaki Disease)

  • 한재준;고홍기;유영;이정화;이광철;손창성;이주원
    • Clinical and Experimental Pediatrics
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    • 제50권2호
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    • pp.205-208
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    • 2007
  • 목 적: 혈관내피 손상과 섬유소 용해계의 표지자 중 하나인 D-dimer가 가와사끼병의 감별진단과 관상동맥 병변의 예측인자로서 유용한지를 알아 보고자 하였다. 방 법: 2005년 9월부터 2006년 6월까지 고려대학교 의료원에 입원한 가와사끼병 환아68명(환아군)과 급성 열성질환 환아 28명(대조군)을 대상으로 혈액검사를 시행하여 D-dimer, CRP, ESR, 전해질 및 기타 생화학적 검사를 시행하였으며, 환아군은 급성기와 발병 4, 8주에 심장초음파를 시행하여 관상동맥 병변 여부를 검사하였다. 결 과: D-dimer는 환아군에서 대조군보다 높았으나 유의하지 않았으며($1.21{\pm}0.77{\mu}g/mL$ vs $0.92{\pm}0.71{\mu}g/mL$, P=0.083), 관상동맥 이상을 보였던 군에서 관상동맥 이상이 없었던 군보다 높았으나 역시 유의하지 않았다($1.49{\pm}0.98{\mu}g/mL$ vs $1.15{\pm}0.71{\mu}g/mL$, P=0.169). D-dimer는 환아군과 대조군을 포함한 분석에서 ESR(r=0.203, P<0.05), CRP(r=0.349, P<0.001), 백혈구 수(r=0.275, P<0.01)와 유의한 상관관계를 보였다. 결 론: D-dimer는 가와사끼병에 특이적이지 못하여 다른 열성질환과의 감별진단이나 관상동맥 이상을 예측하는데 유용하지는 못하지만 염증의 정도를 나타내는 비특이인자로서 가와사끼병 환아의 중증도 평가에 보조적 인자가 될 수 있을 것이다.

주사터널링현미경(STM) 기법으로 확인된 $Si(5\;5\;12)-2\times1$ 호모에피텍시 성장 방법 (Homoepitaxial Growth Mode of $Si(5\;5\;12)-2\times1$ Confirmed by Scanning Tunneling Microscope (STH))

  • 김희동;조유미;서재명
    • 한국진공학회지
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    • 제15권1호
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    • pp.37-44
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    • 2006
  • 초고진공 아래에서 주사터널링현미경을 이용해서 $495^{\circ}C$의 Si(5 5 12) 기판에 호모에피텍시를 시도하여 층상성장의 미세한 과정을 연구하였다 최초에는 Si Dimer가 기본블록이 되어 Si(5 5 12) 단위세포 내 (337)과 (225) 부분의 Si Dimer/Adatom 자리에 우선적으로 흡착하여 Si(5 5 12) 단위세포는 Si addimer로 채워진 $3\times(337)$ 세부 부분과 $1\times(113)$ 세부 부분으로 변한다. 이 과정 중 Si(5 5 12) 단위세포 내 또 다른 (337)에 있는 Tetramer는 Si Dimer를 흡착할 수 있는 Dimer/Adatom 자리로 변환한다 추가적인 Si 흡착으로 각각의 (337) 부분은 (112)과 (113)으로 나뉘어, 마침내 Si(5 5 12) 단위세포는 $3\times(112)\;와\; 4\times(113)$의 패싯들로 바뀐다. 이 단계에서 벌집사슬형과 Dimer/Adatom의 1차원 구조의 상호 변환이 선택적으로 일어난다. 기판의 단위세포 주기를 가지는 패싯의 높이는 2.34 효까지 성장하며, 끝으로 이 패싯 사이의 골짜기가 채워진다. 마지막 단계가 끝나면 균일하고 평평한 Si(5 5 12) 테라스가 복원된다. 본 연구로부터 Si(5 5 12) 호모에피텍시가 단위세포 당 28 개의 Si 원자가 흡착됨으로써 주기적으로 이루어지고, 기판 단위세포 내에서 패시팅이 균일한 오버레이어 필름 두께를 유도하는 데에 결정적 역할을 한다는 점에서 그 성장 방식이 독특하다고 할 수 있다.

Plasma D-dimer Can Effectively Predict the Prospective Occurrence of Ascites in Advanced Schistosomiasis Japonica Patients

  • Wu, Xiaoying;Ren, Jianwei;Gao, Zulu;Xu, Yun;Xie, Huiqun;Li, Tingfang;Cheng, Yanhua;Hu, Fei;Liu, Hongyun;Gong, Zhihong;Liang, Jinyi;Shen, Jia;Liu, Zhen;Wu, Feng;Sun, Xi;Niu, Zhongzheng;Ning, An
    • Parasites, Hosts and Diseases
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    • 제55권2호
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    • pp.167-174
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    • 2017
  • China still has more than 30,000 patients of advanced schistosomiasis while new cases being reported consistently. D-dimer is a fibrin degradation product. As ascites being the dominating symptom in advanced schistosomiasis, the present study aimed to explore a prediction model of ascites with D-dimer and other clinical easy-achievable indicators. A case-control study nested in a prospective cohort was conducted in schistosomiasis-endemic area of southern China. A total of 291 patients of advanced schistosomiasis were first investigated in 2013 and further followed in 2014. Information on clinical history, physical examination, and abdominal ultrasonography, including the symptom of ascites was repeatedly collected. Result showed 44 patients having ascites. Most of the patients' ascites were confined in the kidney area with median area of $20mm^2$. The level of plasma D-dimer and pertinent liver function indicators were measured at the initial investigation in 2013. Compared with those without ascites, cases with ascites had significantly higher levels of D-dimer ($0.71{\pm}2.44{\mu}g/L$ vs $0.48{\pm}2.12{\mu}g/L$, P=0.005), as well ALB (44.5 vs 46.2, g/L) and Type IV collagen (50.04 vs $44.50{\mu}g/L$). Receiver operating characteristic curve analyses indicated a moderate predictive value of D-dimer by its own area under curve (AUC) of 0.64 (95% CI: 0.54-0.73) and the cutoff value as $0.81{\mu}g/L$. Dichotomized by the cutoff level, D-dimer along with other categorical variables generated a prediction model with AUC of 0.76 (95% CI: 0.68-0.89). Risks of patients with specific characteristics in the prediction model were summarized. Our study suggests that the plasma D-dimer level is a reliable predictor for incident ascites in advanced schistosomiasis japonica patients.

Predictive Value of Baseline Plasma D-dimers for Chemotherapy-induced Thrombocytopenia in Patients with Stage III Colon Cancer: A Pilot Study

  • Tanriverdi, Ozgur
    • Asian Pacific Journal of Cancer Prevention
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    • 제14권1호
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    • pp.293-297
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    • 2013
  • Background: : Chemotherapy-induced thrombocytopenia (CIT) is an important cause of morbitity in patients with cancer. Aim: To investigate the effect of the baseline plasma D-dimer level, an important marker for thrombotic activity, on chemotherapy-induced thrombocytopenia in patients with stage III colon cancer. Materials and Methods: A total of 43 (28 men) eligible patients were divided into two groups according to whether they exhibited chemotherapy-induced thrombocytopenia: Group 1 (n=21) and Group 2 (n=22). Comparison was made using demographic, histopathologic, and laboratory variables. Additionally, baseline plasma D-dimer levels underwent receiver operation characteristics curve analysis, and areas under the curve were calculated. Sensitivity, specificity, and positive and negative likelihood rates were then determined. Results: The incidence of chemotherapy-induced thrombocytopenia had a significant correlation with baseline platelet count (r=0.568, P=0.031) and baseline plasma D-dimer levels (r=0.617, P=0.036). When the cut-off point for the latter was set as 498 ng/mL, the area under the curve was 0.89 (95%CI: 0.74-0.93), the sensitivity was 91.4%, the specificity was 89.7%, the positive likelihood rate was 3.64 and the negative likelihood rate was 0.24 for chemotherapy-induced thrombocytopenia diagnosis. Conclusions: The baseline level of plasma D-dimer could help to differentiate high-risk patients for chemotherapy-induced thrombocytopenia.

p-aminodiphenylamine을 이용한 폴리아닐린 분자량 조절 (Control of Polyaniline Molecular Weight Based on p-aminodiphenylamine)

  • 홍장후;전제열
    • 공업화학
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    • 제20권1호
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    • pp.75-79
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    • 2009
  • 아닐린 단량체(monomer)의 화학적 중합시 사슬성장의 핵심생성구간에서 아닐린 이합체(dimer, p-aminodiphenylamine)의 몰 비율을 조절하여 반응용액에 첨가함으로써 분자량(Mw, 20000~10000) 조절이 가능한 폴리아닐린을 합성 하였다. 중합반응의 개시로 부터 측정된 반응시간에 따른 open-circuit potential 측정결과 첨가된 이합체의 몰수가 증가할수록 중합속도가 빨라짐을 확인하였다. 첨가된 이합체의 몰수가 증가할수록 UV/Vis. 측정결과 합성된 폴리아닐린의 흡수띄가 단파장으로 이동하였으며, GPC 측정결과 분자량이 감소하는 것을 볼 수 있었다.

NMR PEAK ASSIGNMENT FOR THE ELUCIDATION OF THE SOLUTION STRUCTURE OF T4 ENDONUCLEASE V

  • Im, Hoo-Kang;Jee, Jun-Goo;Yu, Jun-Suk;Lee, Bong-Jin
    • 한국생물물리학회:학술대회논문집
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    • 한국생물물리학회 1996년도 정기총회 및 학술발표회
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    • pp.18-18
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    • 1996
  • Bacteriophage T4 endonuclease V initiates the repair of ultraviolet (UV)-induced pyrimidine dimer photoproducts in duplex DNA. The mechanism of DNA strand cleavage involves four sequential steps: linear diffusion along dsDNA, pyrimidine dimer-specific binding, pyrimidine dimer-DNA glycosylase activity, and AP lyase activity. (omitted)

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Ab initio SCF Calculations of Potential Energy Surfaces for the Proton Transfer in a Formamide Dimer

  • Kong, Young-Shik;Jhon, Mu-Shik
    • Bulletin of the Korean Chemical Society
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    • 제12권1호
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    • pp.22-26
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    • 1991
  • Potential energy surfaces for the proton transfer in a formamide dimer have been obtained by ab initio SCF calculations with STO-3G, 3-21G, and 4-31G basis sets and several features have been discussed. Energy minima for a formamide dimer and its tautomer are varied with basis sets. But the general features of the potential energy surfaces are similar among them.

Theoretical Studies on the Potential Energy Profiles for Proton Transfer Reaction in Formamide Dimer

  • Young Shik Kong;Mu Shik Jhon
    • Bulletin of the Korean Chemical Society
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    • 제10권6호
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    • pp.488-491
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    • 1989
  • Theoretical studies on the proton transfer reaction in a formamide dimer have been done by Ab initio SCF calculation. In this study, we have shown several effects on the potential energy profile of the proton transfer in a formamide dimer, such as the effect of a basis set, the effect of a geometry optimization, and the effect of a distance between proton-donor and proton-acceptor.

Tl-Tl Interactions in Tl Dimer Investigated by Relativistic and Nonrelativistic EHT Calculations

  • Lee, Yoon-Sup;Do, Young-Kyu
    • Bulletin of the Korean Chemical Society
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    • 제10권4호
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    • pp.346-348
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    • 1989
  • Interactions between Tl atoms for the Tl dimer are studied by relativistic and nonrelativistic EHT methods. Relativistic bond weakening for the Tl dimer is qualitatively explained by comparing orbital energies from relativistic and nonrelativistic calculations. It is also shown that significant overlap exists, especially for 6p orbitals, at the internuclear distance larger than 4 ${\AA}$, implying that Tl-Tl interaction is not just the electrostatic interaction in the recently discovered dimeric thallacarborane.