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Invariant Mass Spectroscopy for the Neutron Rich Nuclei
Satou, Y.,Tshoo, K.,Bhang, H. C.,Choi, S. H.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Sugimoto, T.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N. Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics
Satou, Y.,Tshoo, K.,Bhang, H.,Choi, S.,Hwang, J. W.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N.,Takeu Springer-Verlag 2013 Few-body systems Vol.54 No.1
Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005
Kuwata, M.,Kondo, Y.,Miyazaki, Y.,Komazaki, Y.,Kim, J. H.,Yum, S. S.,Tanimoto, H.,Matsueda, H. Copernicus GmbH 2008 Atmospheric Chemistry and Physics Vol.8 No.11
<P>Abstract. We measured the number concentrations of cloud condensation nuclei (CCN) and the size distributions of CCN/CN (CN: condensation nuclei) ratios at supersaturations (SSs) of 0.097, 0.27, 0.58, and 0.97% at Jeju Island, Korea during March-April 2005. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. The CCN/CN ratios increased with increasing particle diameter, and the diameter at CCN/CN=0.5 was defined as D50. D50 represents the activation dry diameter of atmospheric particles. The average D50 at SS=0.097% and 0.97% was 136±17 nm and 31±3 nm, respectively. The temporal variation of D50 at SS=0.097% was correlated with the mass fraction of water-soluble components (inorganic ions + WSOC), indicating that the temporal variation of CCN activity was mainly controlled by changes in the water-soluble components fraction. The critical dry diameter (Dcrit), which is the threshold dry diameter for CCN activation, was calculated from the observed aerosol chemical compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although Dcrit was larger than D50 by 20-29% on average. The systematic difference between D50 and Dcrit could be caused by the size dependence of the aerosol chemical compositions or surface tension lowering caused by the mixing of water-soluble organic compounds. This difference corresponds to a 27±14% uncertainty in the CCN number concentration estimated from the observed particle number size distribution. </P>
Tshoo, K.,Satou, Y.,Bertulani, C.A.,Bhang, H.,Choi, S.,Nakamura, T.,Kondo, Y.,Deguchi, S.,Kawada, Y.,Nakayama, Y.,Tanaka, K.N.,Tanaka, N.,Togano, Y.,Kobayashi, N.,Aoi, N.,Ishihara, M.,Motobayashi, T. Elsevier 2014 Physics letters: B Vol.739 No.-
<P><B>Abstract</B></P> <P>One-neutron knockout from <SUP>24</SUP>O leading to the first excited state in <SUP>23</SUP>O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of <SUP>23</SUP>O was reconstructed from the measured four momenta of the <SUP>22</SUP>O fragment and emitted neutron. A sharp peak was found at <SUB> E decay </SUB> = 50 ± 3 keV , corresponding to an excited state in <SUP>23</SUP>O at 2.78 ± 0.11 MeV , as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with <I>d</I>-wave neutron knockout, providing support for a <SUP> J π </SUP> assignment of 5 / <SUP> 2 + </SUP> . The associated spectroscopic factor was deduced to be <SUP> C 2 </SUP> S ( 0 <SUB> d 5 / 2 </SUB> ) = 4.1 ± 0.4 by comparing the measured cross section ( σ − 1 n exp = 61 ± 6 mb ) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0 <SUB> d 5 / 2 </SUB> orbital is in line with the N = 16 shell closure in <SUP>24</SUP>O.</P>
Jang, B.,Jeon, Y. C.,Shin, H. Y.,Lee, Y. J.,Kim, H.,Kondo, Y.,Ishigami, A.,Kim, Y. S.,Choi, E. K. HUMANA PRESS INC 2018 Molecular Neurobiology Vol.55 No.4
<P>Myelin basic protein (MBP) citrullination by peptidylarginine deiminase (PAD) enzymes leads to incomplete protein-lipid bilayer interactions and vulnerability to proteolytic enzymes, resulting in disorganization of the myelin sheath in the central nervous system. Therefore, citrullinated MBP (citMBP) has been suggested as a hallmark of demyelination, but how citMBP is implicated in prion diseases remains unknown. For the first time, we developed mouse monoclonal anti-citMBP IgG1 (clones 1B8, 1H1, and 3C6) and IgM (clone 3G5) antibodies that recognize human citMBP at its R25, R122, and R130 residues and at its C-terminal region (or the corresponding sites in mouse MBP), respectively. Using a biochemical, immunohistochemical, and immunogold-silver staining for electron microscopy techniques, we found that MBP residue R23 (corresponding to human R25) was specifically citrullinated, was stained as intense punctae in the corpus callosum, the striatum, and the cerebellar white matter, and was predominantly localized in disorganized myelin in the brains of scrapie-infected mice. In the brains of Creutzfeldt-Jakob disease (CJD) patients, MBP residues R25, R122, and R130 were markedly citrullinated and were stained as fibrils and punctae. In particular, white matter regions, such as the midbrain and the medulla, exhibited high levels of citMBP compared to other regions. However, the high levels of citMBP were not correlated with PAD2 expression. The clone 3G5 recognized significantly increased expression of the 18.5 kDa and/or 21.5 kDa variants of MBP in prion disease. Our findings suggest that significantly increased levels of citMBP may reflect demyelinating neuropathology, and that these newly developed antibodies may be useful for identifying demyelination.</P>
Jung, J.,Kim, Y.J.,Lee, K.Y.,Kawamura, K.,Hu, M.,Kondo, Y. Pergamon Press ; Elsevier [distribution] 2011 Atmospheric environment Vol.45 No.39
Two semi-continuous Sunset carbon analyzers, with different peak inert mode temperatures (615 and 740 <SUP>o</SUP>C), were simultaneously operated to measure fine particulate organic carbon (OC) and elemental carbon (EC) using a thermal-optical transmittance method at an urban site in Beijing, China, from 16 August to 3 September 2006 during the CAREBeijing 2006 campaign. Excellent agreements were obtained between the collocated semi-continuous carbon analyzers, with slopes of 1.02 (R<SUP>2</SUP> = 0.91) for OC and 1.06 (R<SUP>2</SUP> = 0.93) for EC, resulting in very similar average EC/total carbon (TC) ratios of ∼0.36. These results imply that the different peak inert mode (100% helium) temperatures did not cause significant biases on the semi-continuous OC and EC measurements. However, it was found that the EC/TC ratio was greatly influenced by the accumulated refractory particles remaining on a quartz filter (PM<SUB>refractory</SUB>). Fresh quartz filters, with low PM<SUB>refractory</SUB> loadings, which is defined as a laser correction factor >=0.94, gave ∼8-10% lower EC/TC ratios than aged quartz filters with high PM<SUB>refractory</SUB> loadings. The linear regression slope between EC and optically measured EC (OPT-EC) was much higher with fresh quartz filters (slope = 1.03, R<SUP>2</SUP> = 0.96) than aged quartz filters (slope = 0.89, R<SUP>2</SUP> = 0.95), suggesting the underestimation of EC on fresh quartz filters by ∼15% compared to those measured on aged quartz filters. Authentic standard humic-like substances (HULIS) on the clean quartz filter showed the highest extent of pyrolyzed organic carbon (POC) formation (47.4% in total detected carbon mass), followed by those on the Asian dust loaded quartz filter (37%) and the refractory urban pollutant loaded quartz filter (34.1%), indicating that the Asian dust and refractory urban pollutant reduced the POC formation from the HULIS. Thus, this study suggested that the PM<SUB>refractory</SUB> loading plays an important role in the semi-continuous OC and EC measurements by altering the degree of POC formation in the inert atmosphere.