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Plasma-Confinement Physics Study in Compact Helical System
stoichi Okamura,A. Fujisawa,A. Shimizu,C. Takahashi,C. Suzuki,H. Iguchi,H. Nakano,H. Matsushita,K. Nagaoka,K. Matsuo,K. Ida,K. Toi,K. Nakamura,K. Matsuoka,M. Yoshinuma,M. Isobe,M. Takeuchi,R. Ikeda,S. 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In a CHS experiment, various types of transport barrier have been studied. An internal transport barrier (ITB) for electrons in a stellarator was first found in CHS, and the ITB for improved ion confinement was also found. H-mode (edge transport barrier) study in CHS showed many common features in transition to tokamak experiments, although the magnetic surface quantities are very different. Discharges with a combination of ETB and ITB were also found. Two heavy ion beam diagnostics in CHS showed a new direct measurement of zonal flow structure in toroidal confinement. The relation between the fluctuation and the transport barrier was also studied.
Frost, Jennifer M.,Kim, M. Yvonne,Park, Guen Tae,Hsieh, Ping-Hung,Nakamura, Miyuki,Lin, Samuel J. H.,Yoo, Hyunjin,Choi, Jaemyung,Ikeda, Yoko,Kinoshita, Tetsu,Choi, Yeonhee,Zilberman, Daniel,Fischer, R National Academy of Sciences 2018 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.115 No.20
<▼1><P><B>Significance</B></P><P>The chromatin remodeling activities of the FACT (facilitates chromatin transactions) complex are required for many cellular functions, including transcription, DNA replication, and repair. Here, we demonstrate that the two FACT subunits, SSRP1 and SPT16, are also required for genome-wide DNA demethylation and regulation of gene imprinting during <I>Arabidopsis</I> reproduction. Without FACT, <I>Arabidopsis</I> seeds undergo abnormal development and exhibit aberrant DNA hypermethylation, including at imprinting control region loci. We show that FACT associates with the DEMETER (DME) DNA demethylase, facilitating DNA demethylation at over half of DME’s targets, specifically those which reside in heterochromatin. These results provide insight into upstream events in the DNA demethylation pathway and reveal the importance of chromatin remodeling for DNA demethylation during <I>Arabidopsis</I> reproduction.</P></▼1><▼2><P>The DEMETER (DME) DNA glycosylase catalyzes genome-wide DNA demethylation and is required for endosperm genomic imprinting and embryo viability. Targets of DME-mediated DNA demethylation reside in small, euchromatic, AT-rich transposons and at the boundaries of large transposons, but how DME interacts with these diverse chromatin states is unknown. The STRUCTURE SPECIFIC RECOGNITION PROTEIN 1 (SSRP1) subunit of the chromatin remodeler FACT (facilitates chromatin transactions), was previously shown to be involved in the DME-dependent regulation of genomic imprinting in <I>Arabidopsis</I> endosperm. Therefore, to investigate the interaction between DME and chromatin, we focused on the activity of the two FACT subunits, SSRP1 and SUPPRESSOR of TY16 (SPT16), during reproduction in <I>Arabidopsis</I>. We found that FACT colocalizes with nuclear DME in vivo, and that DME has two classes of target sites, the first being euchromatic and accessible to DME, but the second, representing over half of DME targets, requiring the action of FACT for DME-mediated DNA demethylation genome-wide. Our results show that the FACT-dependent DME targets are GC-rich heterochromatin domains with high nucleosome occupancy enriched with H3K9me2 and H3K27me1. Further, we demonstrate that heterochromatin-associated linker histone H1 specifically mediates the requirement for FACT at a subset of DME-target loci. Overall, our results demonstrate that FACT is required for DME targeting by facilitating its access to heterochromatin.</P></▼2>
h Ninomiya,T. Imai,T. Fujii,T. Suzuki,T. Fujita,T. Yamamoto,Y. Uesugi,Y. Kamada,Y. Takase,Y. Kudo,Y. Miura,Y. Ikeda,Y. M. Miura,A. Shimizu,A. Kimura,A. Morioka,A. Nishimura,A. Sagara,G. Kurita,H. Kubo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The NCT Program, in which the present JT-60U is being modified into a superconducting coil machine, is discussed under nationwide collaboration in Japan. Its mission is to establish high-beta steady-state operation for DEMO and to contribute to ITER. NCT is designed to have potential to investigate such research.
IKEDA, TAKEHISA,GRIMME, STEPHEN,Ma, NING,IKEDA, SEACHIRO,FIENO, ANGELA,IVES, DAVID H,GUO, SHENYUAN,PARK, INSHIK 東亞大學校附設遺傳工學硏究所 1997 遺傳工學硏究 Vol.- No.4
Three of the four deoxynucleoside kinases required for growth of Lactobacillus acidophilus R-26 exist as heterodimeric pairs specific for deoxyadenosine(dAK) and deoxycytidine (dCK) or dAK and deoxyguanosine (dGK). However, only two tandem genes, dak/dgk, are found, and are expressed only as dAK/dGK in transformed Escherichia coli. Sequencing peptides spanning 63% of the native dCK subunit revealed a sequence identical to that deduced from dgk(beginning MTVIVL…), except that dCK lacks residues 2 and 3 (dCK is M-IVL;dGK is ·TVIVL). Also, mass spectrometry indicates that native dCK and dGK subunits are identical in mass adjusted for the first three residues. Furtheromore, the native enzymes have identical isoelectric pH values, indicating an equal number of charged residues. To enable E. coli to express peptide having the native dCK sequence, codons 2 and 3 were deleted from the dgk portion of the tandem genes, resulting in expression of protein having the specificities and regulatory properties of dAK/dCK, including heterotropic stimulation of dAK activity by deoxycytidine or dCTP (not deoxyguanosine or dGTP) and end-product inhibition of the respective activities by dATP and dCTP. Subcloning normal and mutant dgk yielded homodimeric dGK and dCK, respectively. The dCK homodimer strongly resembles human dCK with a low ?? for deoxycytidine, the ability to phosphorylate deoxyadenosine and deoxyguanosine at much higher ?? values, and end-product inhibition by dCTP. Thus two distinct and specific enzymes evidently are derived from a single Lactobacillus gene. The mechanism by which this occurs in vivo has yet to be elucidated.
A Study of the Electromagnetic Calorimeter Trigger Signal for the BELLE Experiment
H. Ikeda,천병구 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
We measured the peaking time and the noise level of the fast-shaping signal to be used for the electromagnetic calorimeter trigger of the BELLE experiment performed at the $e^{+}e^{-}$ collider (KEKB). After this measurement, we chose a shaping time of 200 ns for the fast shaper. For this case, the electronics noise was estimated to be 6030 electron-hole pairs, which corresponds to a 2.0-MeV energy deposit in CsI(T$l$) crystal. The corresponding peaking time is 760 ns, which is suitable for the requirement of BELLE global trigger timing latency.
H. I. KIM,Y. J. KIM,이기형,H. Y. JEONG,Y. IKEDA 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.7
Diesel engines are most frequently used in vehicles because of their high efficiency and durability. However,nitrogen oxide (NOx) and particulate matter (PM) from diesel engines are became problem. Recently, the premixed chargedcompression ignition (PCCI) technique has been studied specifically to reduce NOx and PM emissions simultaneously. Whilethe PCCI engine has the advantage of reducing NOx and PM emissions, control of the combustion phase is difficult. Therefore, it is very important to understand the flame developing process and heat release pattern in a real PCCI engine. However, most research into the characteristics of PCCI combustion has used an optical access engine. This paper describesthe combustion characteristics obtained using a micro-Cassegrain sensor and discusses how the sensor can be used to directlydetect the flame characteristics for future control of PCCI combustion. From this research, the differences of flamecharacteristics between PCCI engine and conventional diesel engine were clarified.
Lee, H. H.,Park, I. H.,Kim, S.,Lee, E.,Ju, H.,Jung, J.,Ikeda, M.,Habata, Y.,Lee, S. THE ROYAL SOCIETY OF CHEMISTRY 2017 Chemical science Vol.8 No.4
<P>It is a challenge to develop methodologies involving multiple transformations for preparing new materials that cannot be obtained via direct synthesis. Herein, we report an anion exchange process accompanying cation reduction and dimerisation via a single-crystal-to-single-crystal transformation. First, a direct reaction of the flexible tripyridyl dithioether ligand L with CuI afforded a mixture of four bis(ligand) complexes (1a-1d). To avoid the formation of undesired mixed products, a copper(II) nitrate complex-mediated approach involving anion exchange and cation reduction was employed to generate a monomeric complex, [Cu-II(L)NO3]NO3 center dot toluene (2). When the dark blue crystals of 2 were immersed in an aqueous NaI solution, the crystals were transformed to a pale yellow dimeric copper(I) iodide complex, [(mu-CuI2+I2)(L)(2)] (3). The observed anion exchange promotes the reduction of copper(II) to copper(I) at the expense of I-/I-3(-) oxidation as well as dimerisation via the formation of a Cu2I2 cluster. This result corresponds to the synthesis of a compound that otherwise was not able to be prepared via a direct synthetic procedure.</P>