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Lee, M.Y.,Lee, S.M.,Song, E.G.,An, J.H.,Voloshina, I.,Chong, J.R.,Johnson, W.E.,Min, M.S.,Lee, H. Pergamon Press 2016 Biochemical systematics and ecology Vol.69 No.-
<P>Accurate taxonomic classification of wildlife species is crucial for guiding biological research and for developing effective management and conservation programs. The taxonomic status of Eurasian badgers from South Korea remains poorly resolved. Here we assessed the phylogenetic relationships and genetic variation of Eurasia badgers using partial mitochondrial fragments to elucidate the evolutionary history and taxonomic status of badgers from the Korean Peninsula. Forty-eight unique haplotypes from 125 individuals were observed. Phylogenetic reconstructions and reduced median networks indicate that Eurasian badgers consisted of four geographic clades (Japan, Eastern Eurasia, Western Eurasia, and Caucasus) with a relatively weak split observed within Eastern Eurasia. Estimated divergence time between the Japanese and Eastern Eurasian clades, including the Korean population, was 467,100 years (69,200-1,085,500 years). The results of this study support the hypothesis that the Japanese badger migrated from the Eurasian continent over the Korea-Japan land bridge and that the Korean Peninsula was an important refugia during the Pleistocene. Our study confirmed that the South Korean badger, Meles metes, belongs to the Eastern Eurasian clade. Based on these results and those of previous studies, we recommend that the scientific name of the Korean badger be changed from M. metes to Meles leucurus (Asian badger). (C) 2016 Elsevier Ltd. All rights reserved.</P>
Formation of large SiC nanocrystals on Si(1 0 0) by 12C implantation and electron beam annealing
A. Markwitz,S. Johnson,J. Kennedy,M. Rudolphi,H. Baumann 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Scanning electron microscopy and nuclear reaction analysis have been used to study annealing eects of 10 keV12C implanted andelectron beam annealed silicon (10) substrates that cause the formation of large SiC nanocrystals named nanoboulderson silicon.Wafer silicon was implanted with varying uences from 0.38 to 1.14· 1017 atoms cm. 2 and subsequently annealed at 1000.C for15 s. The deuterium induced12C(d,p)13C reaction was used to measure the12C dose quantitatively. It was found that the implanted car-bon remained in the specimen after annealing. This result, coupled with geometrical analyses of the resulting nanostructures suggest thatfollowing nucleation, the SiC nanocrystals grow as a result of C and Si diusion across the substrate surface, that became oxide freeduring annealing under vacuum conditions.
s -wave scattering lengths for the Be7+p system from an R -matrix analysis
Paneru, S. N.,Brune, C. R.,Giri, R.,Livesay, R. J.,Greife, U.,Blackmon, J. C.,Bardayan, D. W.,Chipps, K. A.,Davids, B.,Connolly, D. S.,Chae, K. Y.,Champagne, A. E.,Deibel, C.,Jones, K. L.,Johnson, M. American Physical Society 2019 Physical Review C Vol.99 No.4
Field emission properties of self-assembled silicon nanostructures formed by electron beam annealing
S. Johnson,A. Markwitz,M. Rudolphi,H. Baumann,S.P. Oei,K.B.K. Teo,W.I. Milne 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Arrays of silicon nanostructures on n- and p-type silicon (100) substrates were fabricated using electron beam annealing of untreated silicon at 1100 C. Following annealing for 15 s, the nanostructures exhibit an average height of 8 ± 1 nm and a surface density of 11 lm2, independent of the substrate conduction type. Following annealing for 600 s the individual nanostructures coalesce and the surface appears roughened with an rms roughness of 30 nm. The field emission properties of these nanostructure arrays have been assessed and electron emission through Fowler–Nordheim tunnelling was confirmed. The difference in threshold field for electron emission from the nanostructured and roughened substrates is related to the geometrical differences between the substrate surfaces. At large electric fields, space charge limited conduction dominates the field emission characteristics of the nanostructured surface.
Applications of Photonuclear Physics for International Safeguards and Security
M. S. Johnson,J. M. Hall,D. P. McNabb,J. L. McFarland,E. B. Norman,W. Bertozzi,S. E. Korbly,R. J. Ledoux,W. H. Park 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Studies of nuclear resonance fluorescence based applications are presented. Important for these applications are data for isotopes such as ^(239)Pu. Nuclear resonance fluorescence measurements of ^(239)Pu were performed at the free electron laser facility at UC Santa Barbara using photons from a bremsstrahlung beam with an endpoint energies between 4.0 MeV and 5.5 MeV. Though no discrete states with significant confidence level were measured, we have excluded the region above 27(3) eV-barns, or 4-sigma, where we would expect only a small chance of false positives. Details of the measurements and the results are presented here.
X-ray detections of submillimetre galaxies: active galactic nuclei versus starburst contribution
Johnson, S. P.,Wilson, G. W.,Wang, Q. D.,Williams, C. C.,Scott, K. S.,Yun, M. S.,Pope, A.,Lowenthal, J.,Aretxaga, I.,Hughes, D. Oxford University Press 2013 Monthly notices of the Royal Astronomical Society Vol.431 No.1
Park, S.J.,Johnson, J.L.,Wu, Y.,Kwon, Y.S.,Lee, S.,German, R.M. MPR Pub. Services 2013 INTERNATIONAL JOURNAL OF REFRACTORY METALS AND HAR Vol.37 No.-
The densification behavior of 88W-8.4Ni-3.6Fe, 88W-8.4Ni-3.6Cu, and W-15Cu during heating is compared using the master sintering curve (MSC) approach. The MSC parameters, such as the work of sintering, activation energy, and densification ratio, are calculated from dilatometry tests, based on which the densification is classified into three regions with different sintering mechanisms. This approach enables contrast and comparison of the densification sensitivity to solubility, temperature, and heating rate. The master sintering curves are combined into a master sintering surface that includes integral work and the solubility of tungsten in the liquid phase.
Characterization of the direct physical interaction of nc886, a cellular non-coding RNA, and PKR
Jeon, S.H.,Lee, K.,Lee, K.S.,Kunkeaw, N.,Johnson, B.H.,Holthauzen, L.M.F.,Gong, B.,Leelayuwat, C.,Lee, Y.S. North-Holland Pub ; Elsevier Science Ltd 2012 FEBS letters Vol.586 No.19
We have recently shown that nc886 (pre-miR-886 or vtRNA2-1) is not a genuine microRNA precursor nor a vault RNA, but a novel type of non-coding RNA that represses PKR, a double-stranded RNA (dsRNA) dependent kinase. Here we have characterized their direct physical association. PKR's two RNA binding domains form a specific and stable complex with nc886's central portion, without any preference to its 5'-end structure. By binding to PKR with a comparable affinity, nc886 competes with dsRNA and attenuates PKR activation by dsRNA. Our data suggest that nc886 sets a threshold for PKR activation so that it occurs only during genuine viral infection but not by a minute level of fortuitous cellular dsRNA.
Magnetoresistance (MR) of twisted bilayer graphene on electron transparent substrate
Hong, S.J.,Rodriguez-Manzo, J.A.,Kim, K.H.,Park, M.,Baek, S.J.,Kholin, D.I.,Lee, M.,Choi, E.S.,Jeong, D.H.,Bonnell, D.A.,Mele, E.J.,Drndic, M.,Johnson, A.,Park, Y.W. Elsevier Sequoia] 2016 Synthetic metals Vol.216 No.-
We studied the magnetoresistance (MR) of twisted bilayer graphene (tBLG) on electron transparent substrate. Samples of tBLG were assembled on free-standing silicon nitride (SiN<SUB>x</SUB>) membranes (<100nm thick) by transferring chemical vapor deposition (CVD)-grown single layer graphene (SLG) twice; this allowed the measurement of the angle of rotation between the two layers, the twist angle, by electron diffraction using a transmission electron microscope (TEM). To compare with the previous reports on tBLG, we performed Raman spectroscopy on our samples. We measured the MR of tBLG for two different twist angles: 2<SUP>o</SUP> (small) and 18<SUP>o</SUP> (large). The MR showed superposition of two Shubnikov de Haas (SdH) oscillations for both angles. An analysis of the oscillation peaks by Landau fan diagrams showed difference as twist angle. While the large twist angle (18<SUP>o</SUP>) sample had two anomalous π Berry's phases, the small twist angle (2<SUP>o</SUP>) sample had conventional 2π and anomalous π Berry's phase depending on carrier density.