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Ying, J,Poon, F F,Yu, J,Geng, H,Wong, A H Y,Qiu, G-H,Goh, H K,Rha, S Y,Tian, L,Chan, A T C,Sung, J J Y,Tao, Q Nature Publishing Group 2009 The British journal of cancer Vol.100 No.4
<P>Promoter CpG methylation of tumour suppressor genes (TSGs) is an epigenetic biomarker for TSG identification and molecular diagnosis. We screened genome wide for novel methylated genes through methylation subtraction of a genetic demethylation model of colon cancer (double knockout of <I>DNMT1</I> and <I>DNMT3B</I> in HCT116) and identified <I>DLEC1</I> (Deleted in lung and oesophageal cancer 1), a major 3p22.3 TSG, as one of the methylated targets. We further found that <I>DLEC1</I> was downregulated or silenced in most colorectal and gastric cell lines due to promoter methylation, whereas broadly expressed in normal tissues including colon and stomach, and unmethylated in expressing cell lines and immortalised normal colon epithelial cells. <I>DLEC1</I> expression was reactivated through pharmacologic or genetic demethylation, indicating a DNMT1/DNMT3B-mediated methylation silencing. Aberrant methylation was further detected in primary colorectal (10 out of 34, 29%) and gastric tumours (30 out of 89, 34%), but seldom in paired normal colon (0 out of 17) and gastric (1 out of 20, 5%) samples. No correlation between <I>DLEC1</I> methylation and clinical parameters of gastric cancers was found. Ectopic expression of <I>DLEC1</I> in silenced HCT116 and MKN45 cells strongly inhibited their clonogenicity. Thus, <I>DLEC1</I> is a functional tumour suppressor, being frequently silenced by epigenetic mechanism in gastrointestinal tumours.</P>
A study on the dynamic characteristics of the secondary loop in nuclear power plant
Zhang, J.,Yin, S.S.,Chen, L.,Ma, Y.C.,Wang, M.J.,Fu, H.,Wu, Y.W.,Tian, W.X.,Qiu, S.Z.,Su, G.H. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5
To obtain the dynamic characteristics of reactor secondary circuit under transient conditions, the system analysis program was developed in this study, where dynamic models of secondary circuit were established. The heat transfer process and the mechanical energy transfer process are modularized. Models of main equipment were built, including main turbine, condenser, steam pipe and feedwater system. The established models were verified by design value. The simulation of the secondary circuit system was conducted based on the verified models. The system response and characteristics were investigated based on the parameter transients under emergency shutdown and overload. Various operating conditions like turbine emergency shutdown and overspeed, condenser high water level, ejector failures were studied. The secondary circuit system ensures sufficient design margin to withstand the pressure and flow fluctuations. The adjustment of exhaust valve group could maintain the system pressure within a safe range, at the expense of steam quality. The condenser could rapidly take out most heat to avoid overpressure.
Determination of the Fe magnetic anisotropies and the CoO frozen spins in epitaxial CoO/Fe/Ag(001)
Li, J.,Meng, Y.,Park, J. S.,Jenkins, C. A.,Arenholz, E.,Scholl, A.,Tan, A.,Son, H.,Zhao, H. W.,Hwang, Chanyong,Wu, Y. Z.,Qiu, Z. Q. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.9
Wu, J,Carlton, D,Oelker, E,Park, J S,Jin, E,Arenholz, E,Scholl, A,Hwang, Chanyong,Bokor, J,Qiu, Z Q IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.34
<P>Epitaxial Py/Cu/Co/Cu(001) trilayers were patterned into micron sized disks and imaged using element-specific photoemission electron microscopy. By varying the Cu spacer layer thickness, we study how the coupling between the two magnetic layers influences the formation of magnetic vortex states. We find that while the Py and Co disks form magnetic vortex domains when the interlayer coupling is ferromagnetic, the magnetic vortex domains of the Py and Co disks break into anti-parallel aligned multidomains when the interlayer coupling is antiferromagnetic. We explain this result in terms of magnetic flux closure between the Py and Co layers for the antiferromagnetic coupling case.</P>
Zhang, J.,Yang, Z.,Qiu, J.,Lee, H. W. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.16
<P>Nitrogen (N) and sulfur (S) co-doped porous carbonmaterials (NSPCs) have been prepared by the two-dimensional interlayer confinement effect of a layered double hydroxide (LDH). The NSPCs fabricated by this method have a large specific surface area of 1493.2 m(2) g(-1) and contain plenty of micropores and mesopores, which arise from either the carbonization of organic polymers and the catalytic effect of iron in LDH layers in the calcination process, or the elimination of metal oxides produced by the LDH hosts in acid dissolution. The prepared material exhibits an excellent reversible specific capacity of 1175 mA h g(-1) at 0.5C after 120 cycles. High specific discharge capacities are maintained at fast C rates, e.g. 765, 600, 510, 419, 398, 360, and 326 mA h g(-1) at 1, 2, 6, 15, 20, 30 and 60C, with 15 cycles at each step. We found that the improved electrochemical performance is due to the large quantity of edge defects, and the micropores and mesopores in the material which can provide extra Li storage regions.</P>