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Jung, S.C.,Yeom, J.A.,Kim, J.-H.,Ryoo, I.,Kim, S.C.,Shin, H.,Lee, A.L.,Yun, T.J.,Park, C.-K.,Sohn, C.-H.,Park, S.-H.,Choi, S.H. American Society of Neuroradiology 2014 American journal of neuroradiology Vol.35 No.6
<P><B>BACKGROUND AND PURPOSE:</B></P><P>The usefulness of pharmacokinetic parameters for glioma grading has been reported based on the perfusion data from parts of entire-tumor volumes. However, the perfusion values may not reflect the entire-tumor characteristics. Our aim was to investigate the feasibility of glioma grading by using histogram analyses of pharmacokinetic parameters including the volume transfer constant, extravascular extracellular space volume per unit volume of tissue, and blood plasma volume per unit volume of tissue from T1-weighted dynamic contrast-enhanced perfusion MR imaging.</P><P><B>MATERIALS AND METHODS:</B></P><P>Twenty-eight patients (14 men, 14 women; mean age, 49.75 years; age range, 25–72 years) with histopathologically confirmed gliomas (World Health Organization grade II, <I>n</I> = 7; grade III, <I>n</I> = 8; grade IV, <I>n</I> = 13) were examined before surgery or biopsy with conventional MR imaging and T1-weighted dynamic contrast-enhanced perfusion MR imaging at 3T. Volume transfer constant, extravascular extracellular space volume per unit volume of tissue, and blood plasma volume per unit volume of tissue were calculated from the entire-tumor volume. Histogram analyses from these parameters were correlated with glioma grades. The parameters with the best percentile from cumulative histograms were identified by analysis of the area under the curve of the receiver operating characteristic analysis and were compared by using multivariable stepwise logistic regression analysis for distinguishing high- from low-grade gliomas.</P><P><B>RESULTS:</B></P><P>All parametric values increased with increasing glioma grade. There were significant differences among the 3 grades in all parameters (<I>P</I> < .01). For the differentiation of high- and low-grade gliomas, the highest area under the curve values were found at the 98th percentile of the volume transfer constant (area under the curve, 0.912; cutoff value, 0.277), the 90th percentile of extravascular extracellular space volume per unit volume of tissue (area under the curve, 0.939; cutoff value, 19.70), and the 84th percentile of blood plasma volume per unit volume of tissue (area under the curve, 0.769; cutoff value, 11.71). The 98th percentile volume transfer constant value was the only variable that could be used to independently differentiate high- and low-grade gliomas in multivariable stepwise logistic regression analysis.</P><P><B>CONCLUSIONS:</B></P><P>Histogram analysis of pharmacokinetic parameters from whole-tumor volume data can be a useful method for glioma grading. The 98th percentile value of the volume transfer constant was the most significant measure.</P>
Kim, J.T.,Lee, S.J.,Kim, B.Y.,Lee, C.H.,Yeom, Y.I.,Choe, Y.K.,Yoon, D.Y.,Chae, S.K.,Kim, J.W.,Yang, Y.,Lim, J.S.,Lee, H.G. North-Holland Pub ; Elsevier Science Ltd 2013 FEBS letters Vol.587 No.22
Eukaryotic translation initiation factor 3 is composed of 13 subunits (eIF3a through eIF3m) and plays an essential role in translation. During apoptosis, several caspases rapidly down-regulate protein synthesis by cleaving eIF4G, -4B, -3j, and -2α. In this study, we found that the activation of caspases by cisplatin in T24 cells induces the cleavage of subunit G of the eIF3 complex (eIF3g). The cleavage site (SLRD<SUP>220</SUP>G) was identified, and we found that the cleaved N-terminus was translocated to the nucleus, activating caspase-3, and that it also showed a strong DNase activity. These data demonstrate the important roles of eIF3g in the translation initiation machinery and in DNA degradation during apoptosis.
상용 유한요소 프로그램에서 사용하는 보요소와 판요소의 대변형 거동에 관한 연구
진종태,이경식,염선일 울산대학교 1997 공학연구논문집 Vol.28 No.2
구조물 해석에 널리 쓰이는 상용 유한요소해석용 소프트웨어인 MSC/NASTRAN 과 NISA-Ⅱ를 사용하여 외팔보와 4변이 고정된 정사각형 평판 문제를 해석하고 그 결과를 각각의 이론해와 비교하였다. 미소변형일 경우 외팔보의 유한요소 해석의 결과는 본 연구에서 해석한 모든 경우에 요소수와 무관하게 이론해와 정확히 일치한다. 대변형일 경우에는 외팔보와 평판 문제 모두에서 요소수가 많을수록 또한 보의 길이나 판의 한 변의 길이가 두께에 비해 클수록 이론해에 근접해 가는 경향이 있다. 특히 길이가 높이에 비해 긴 외팔보의 경우요소수가 5 이상이면 이론해와 0.5% 이내의 오차를 보인다. 평판문제의 대변형 해석결과는 NISA-Ⅱ의 해석결과가 MSC/NASTRAN의 해석결과보다 더 이론해에 근접하다. The results of FE analysis of a uniform cantilever beam and a uniformly loaded square plate with all edges clamped, using commercial FE software( MSC/NASTRAN and NISA-Ⅱ), are compared with the analytical solutions. For small deformation in cantilever beam, the results of FE analysis for all the cases are identical with the analytic solutions regardless of the number of elements. For large deformation, the results of the FE analysis tends to approach close to the analytic solutions with the increase in the number of elements and the length to thickness ratios in both of two problems. In particular, for the case of the cantilever whose length is much longer than the depth, the errors are within 1% in cases of the number of elements are more than five. Comparing the results of the large deformation analysis of the square plate reveals that the result of the NISA-Ⅱ is closer to the analytical solution than that of the NSC/NASTRAN.
Symmetry induced peculiar Rashba effect on thallium adsorbed Si(111) surfaces
Sakamoto, K.,Oda, T.,Kimura, A.,Takeichi, Y.,Fujii, J.,Uhrberg, R.I.G.,Donath, M.,Yeom, H.W. Elsevier Scientific Pub. Co 2015 Journal of electron spectroscopy and related pheno Vol.201 No.-
The geometric symmetry of the surface plays an important role for the spin-orbit-induced spin texture of two-dimensional electronic states. This article reviews the peculiar Rashba spins induced by a C<SUB>3</SUB> symmetry, including the completely spin polarized surface states with the polarization vector oriented perpendicular to the surface, i.e. a direction that is not expected in a typical Rashba system. This review also describes that this peculiar Rashba situation has possibility to suppress backscattering and therefore to greatly improve the efficiency of spin transport, which is an essential issue in the development of high-performance semiconductor spintronic devices.