Search Results - (Author, Cooperation:N. Nakajima)

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  1. 1
    N Nakajima, H Koyama, S Hashimoto and S Date
    Institute of Physics (IOP)
    Published 2018
    Staff View
    Publication Date:
    2018-06-20
    Publisher:
    Institute of Physics (IOP)
    Print ISSN:
    1757-8981
    Electronic ISSN:
    1757-899X
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by:
    http://www.iop.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2013-07-12
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Antiviral Agents/pharmacology ; Cells, Cultured ; Chickens/virology ; DNA-Directed RNA Polymerases/antagonists & inhibitors ; Dogs ; Enzyme Inhibitors/pharmacology ; Female ; Ferrets/virology ; Humans ; Influenza A Virus, H1N1 Subtype/drug effects/enzymology ; *Influenza A virus/chemistry/drug effects/isolation & purification/pathogenicity ; Influenza, Human/drug therapy/*virology ; Macaca fascicularis/virology ; Madin Darby Canine Kidney Cells ; Male ; Mice ; Mice, Inbred BALB C ; Models, Molecular ; Monkey Diseases/pathology/virology ; Neuraminidase/antagonists & inhibitors ; Orthomyxoviridae Infections/pathology/transmission/*virology ; Quail/virology ; Swine/virology ; Swine, Miniature/virology ; *Virus Replication/drug effects
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    Publication Date:
    2018-11-02
    Publisher:
    American Society of Hematology (ASH)
    Print ISSN:
    0006-4971
    Electronic ISSN:
    1528-0020
    Topics:
    Biology
    Medicine
    Keywords:
    Immunobiology and Immunotherapy, Lymphoid Neoplasia
    Published by:
    http://www.hematology.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Staff View
    Publication Date:
    2018-01-31
    Publisher:
    The American Society for Microbiology (ASM)
    Print ISSN:
    0022-538X
    Electronic ISSN:
    1098-5514
    Topics:
    Medicine
    Published by:
    http://www.asm.org/

    Latest Papers from Table of Contents or Articles in Press
  5. 5
    Hegna, C. C. ; Nakajima, N.

    [S.l.] : American Institute of Physics (AIP)
    Published 1998
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The stability properties of pressure-driven ballooning and Mercier modes in general stellarator configurations are studied. A perturbation method originally introduced to study tokamak stability by Greene and Chance [Nucl. Fusion 21, 453 (1981)] is generalized to three-dimensional systems. The effects of profile variation can be examined by introducing self-consistent variations in equilibrium quantities to a localized region whose amplitudes are small but whose cross-field derivative is large. In the general case, the set of equilibria are characterized by two free functions, which can be chosen to be the local variation of pressure and rotational transform profiles (or pressure gradient and the field-line-averaged parallel current). In this way, stability curves for Mercier and ballooning modes in three-dimensional equilibria are generated that are analogous to the s-α curves used in studying tokamak equilibrium. © 1998 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.872793

    Articles: DFG German National Licenses
  6. 6
    Bhattacharjee, A. ; Hayashi, T. ; Hegna, C. C. ; Nakajima, N. ; Sato, T.

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The role of singular currents in three-dimensional toroidal equilibria and their resolution by magnetic island formation is discussed from both analytical and computational points of view. Earlier analytical results are extended to include small vacuum islands, which may, in general, have different phases with respect to pressure-induced islands. In currentless stellarators, the formation of islands is shown to depend on the resistive parameter DR, as well as the integrated effect of global Pfirsch–Schlüter currents. It is demonstrated that the pressure-induced "self-healing'' effect, recently discovered computationally, is also predicted by analytical theory. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.871369

    Articles: DFG German National Licenses
  7. 7
    Chen, J. ; Nakajima, N. ; Okamoto, M.

    [S.l.] : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    By means of a global mode analysis of ideal magnetohydrodynamic (MHD) modes for Mercier-unstable equilibria in a planar axis L=2/M=10 heliotron/torsatron system with an inherently large Shafranov shift, the conjecture for global mode in Mercier-unstable equilibria from local mode analysis [N. Nakajima, Phys. Plasmas 3, 4556 (1996)] has been confirmed and the properties of pressure-driven modes inherent to such three-dimensional systems have been clarified. The Mercier-unstable equilibria are categorized into toroidicity-dominant and helicity-dominant Mercier-unstable equilibria. In the toroidicity-dominant Mercier-unstable equilibria, the pressure-driven modes change from interchange modes for low toroidal mode numbers n〈M, to tokamak-like ballooning modes for moderate toroidal mode numbers n∼M, and finally to ballooning modes purely inherent to three-dimensional systems for fairly high toroidal mode numbers n(very-much-greater-than)M. In the helicity-dominant Mercier-unstable equilibria, the pressure-driven modes change from interchange modes for n〈M or n∼M, directly to ballooning modes purely inherent to three-dimensional systems for n(very-much-greater-than)M. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.873410

    Articles: DFG German National Licenses
  8. 8
    Nakajima, N.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The characteristics of the local magnetic shear, a quantity associated with high-mode-number ballooning mode stability, are considered in heliotron/torsatron devices that have a large Shafranov shift. The local magnetic shear is shown to vanish even in the stellarator-like region in which the global magnetic shear s≡2(d ln ι(Slashthrough accent mark)/d ln ψ) (ι(Slashthrough accent mark) is the global rotational transform and 2πψ is the toroidal flux) is positive. The reason for this is that the degree of the local compression of the poloidal magnetic field on the outer side of the torus, which maintains the toroidal force balance, is reduced in the stellarator-like region of global magnetic shear because the global rotational transform in heliotron/torsatron systems is a radially increasing function. This vanishing of the local magnetic shear is a universal property in heliotron/torsatron systems with a large Shafranov shift since it results from toroidal force balance in the stellarator-like global shear regime that is inherent to such systems. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.872077

    Articles: DFG German National Licenses
  9. 9
    Nakajima, N.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    As described in the companion paper [N. Nakajima, Phys. Plasmas 3, 4545 (1996)], in heliotron/torsatron systems that have a large Shafranov shift, the local magnetic shear is found to have no stabilizing effect on high-mode-number ballooning modes at the outer side of the torus, even in the region where the global shear is stellarator-like in nature. The disappearance of this stabilization, in combination with the compression of the flux surfaces at the outer side of the torus, leads at relatively low values of the plasma pressure to significant modifications of the stabilizing effect due to magnetic field-line bending on high-mode-number ballooning modes—specifically, that the field-line bending stabilization can be remarkably suppressed or enhanced. In an equilibrium that is slightly Mercier-unstable or completely Mercier-stable due to peaked pressure profiles, such as those used in standard stability calculations, high-mode-number ballooning modes are destabilized due to these modified stability effects, with their eigenfunctions highly localized along the field line. Highly localized mode structures such as these cause the ballooning mode eigenvalues ω2 to have a strong field line dependence (i.e., α-variation) through the strong dependence of the local magnetic curvature, such that the level surfaces of ω2(ψ,θk,α) (≤0) become spheroids in (ψ,θk,α) space, where ψ labels flux surfaces and θk is the radial wave number. Because the spheroidal level surfaces for unstable eigenvalues are surrounded by level surfaces for stable eigenvalues of high-mode-number toroidal Alfvén eigenmodes, those high-mode-number ballooning modes never lead to low-mode-number modes. In configuration space, these high-mode-number modes are localized in a single toroidal pitch of the helical coils, and hence they may experience substantial stabilization due to finite Larmor radius effects. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.872071

    Articles: DFG German National Licenses
  10. 10
    Ida, K. ; Nakajima, N.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Toroidal rotation profiles are measured with charge exchange spectroscopy for a plasma heated with tangential neutral beam injection (NBI) in the Compact Helical System (CHS) heliotron/torsatron device [Ida et al., Phys. Rev. Lett. 67, 58 (1991)] to estimate the toroidal viscosity. The toroidal viscosity derived from the toroidal rotation velocity shows good agreement with the neoclassical toroidal viscosity plus the perpendicular viscosity (μ⊥=2 m2/s). © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.872091

    Articles: DFG German National Licenses
  11. 11
    Koide, T. ; Miyauchi, H. ; Shidara, T. ; Nakajima, N. ; Kawabe, H. ; Fukutani, H. ; Shimada, K. ; Fujimori, A. ; Iio, K. ; Kamimura, T.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Magnetic circular dichroism (MCD) in core-level absorption provides insights into the element-specific and site-selective magnetic states of various magnetic materials. Fe7S8 and Fe7Se8 have the pseudo-NiAs-type crystal structure and are ferrimagnetic below 578 and ∼450 K, respectively. We have measured MCD spectra in the Fe 2p (L2,3) and Fe 3p (M2,3) core-level absorption of these compounds. The L2,3 MCD spectra were taken at ∼80 K with the total electron yield method. The M2,3 MCD spectra were measured at room temperature with the reflection method using the magnetic-field modulation technique. Both experiments were made using circularly polarized undulator radiation. The L2,3 MCD spectra were found to exhibit a negative peak at the L3 edge with a maximum intensity of ∼10−2 and a weaker positive peak at the L2 edge. The MCD spectrum of Fe7S8 showed sideband features near the L3 edge. Utilization of the magnetic-field modulation method allowed a detection of small MCD signals around the M2,3 edges; the maximum signal intensity was of the order of ∼3×10−3. The M2,3 MCD spectrum of Fe7S8 showed a MCD signal for a prethreshold multiplet, while that of Fe7Se8 exhibited no appreciable MCD signal for a prethreshold multiplet. The features observed in the L2,3 MCD and M2,3 MCD are consistent with an electronic band-structure calculation reported recently. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.362225

    Articles: DFG German National Licenses
  12. 12
    Koide, T. ; Nakajima, N. ; Shidara, T. ; Miyauchi, H. ; Kawabe, H. ; Fukutani, H. ; Fujimori, A. ; Iio, K. ; Katayama, T. ; Suzuki, Y.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A Co/Pt multilayer is one of the most attractive candidates for next-generation high-density magneto-optical recording media. With a decreasing Co layer thickness, the direction of the easy axis of magnetization changes from in-plane to out-of-plane. We have measured core-level MCD of Co/Pt multilayers. Six Co/Pt multilayer samples were prepared which had Co layer thicknesses from 3 to 14 A(ring). The MCD experiments were made using circularly polarized undulator radiation.The spectra were taken separately for the energy regions around the Co M2,3 (and Pt O3) and Pt N6,7 (and Pt O2) edges. The dichroic signals in reflectivity were recorded for two opposite directions of an external magnetic field of 2 T. We have also measured the reflectivity spectra down to 4 eV and have made Kramers–Kronig analyses to obtain the dielectric tensor. The dielectric tensor element which represents absorption MCD shows a dramatic change at the Co M2,3 edges. The MCD spectra of thinner Co-layer samples are more asymmetric than those of thicker ones. This shows that the orbital magnetic moment of Co is enhanced as the Co layer thickness decreases. The MCD spectra become sharper and narrower with a decreasing Co layer thickness. This feature strongly reflects a band narrowing of the Co 3d state at or around the Co/Pt interfaces. The MCD spectra at the Pt N6,7 edges show little dependence on the Co layer thickness. This can be explained by assuming that Pt atoms only at the interfaces are responsible for the MCD signals, since the surface density of Pt atoms is equal for all the samples. Combining the result at the Co M2,3 edges with that at the Pt N6,7 edges leads to the conclusion that perpendicular magnetic anisotropy mainly depends on the electronic structure of Co at Co/Pt interfaces and that Pt atoms at the interfaces play a partial role in magnetic anisotropy. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.362226

    Articles: DFG German National Licenses
  13. 13
    Nakajima, N. ; Cheng, C. Z. ; Okamoto, M.

    New York, NY : American Institute of Physics (AIP)
    Published 1992
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The high-n helicity-induced shear Alfvén eigenmodes (HAE) are considered both analytically and numerically for the straight helical magnetic system, where n is the toroidal mode number. The eigenmode equation for the high-n HAE modes is derived along the field line and, with the aid of the averaging method, is shown to reduce to the Mathieu equation asymptotically. The discrete HAE modes are shown to exist inside the continuum spectrum gaps. The continuous spectrum gaps appear around ω2=ω2A[N(lι(large-closed-square)−m)/2]2 for N=1,2,..., where ωA is the toroidal Alfvén transit frequency, and l, m, and ι(large-closed-square) are the polarity of helical coils, the toroidal pitch number of helical coils, and the rotational transform, respectively. For the same ωA and ι(large-closed-square), the frequency of the helical continuum gap is larger than that of the continuum gap in tokamak plasmas by ||l−ι(large-closed-square)−1m||. The polarity of helical coils l plays a crucial role in determining the spectrum gaps and the properties of the high-n HAE modes. The spectrum gaps near the magnetic axis are created by the helical ripple with circular flux surfaces for l=1, and ≥3 helicals. For l=2 helical systems, the spectrum gaps are created by the ellipticity of the flux surfaces. These analytical results for the continuum gaps and the existence of the high-n HAE modes in the continuum gaps are confirmed numerically for the l=2 case, and it is found that the HAE modes exist for mode structures with the even and the odd parities.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.860119

    Articles: DFG German National Licenses
  14. 14
    Noguchi, K. ; Nakajima, N. ; Terashima, I.

    Oxford, UK : Blackwell Science Ltd
    Published 2001
    Staff View
    ISSN:
    1365-3040
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Notes:
    Acclimation of respiration to the light environments is important for a plant’s carbon balance. Respiratory rates of mature leaves of Alocasia odora, a typical shade-tolerant species, were measured during the night for 14 d after reciprocal transfers between high- (330 µ mol m−2 s−1) and low-light (20 µ mol m−2 s−1) environments. Following the transfer, both the rate of CO2 efflux and that of O2 uptake of A. odora leaves adjusted to the new light environments. The O2-uptake rates changed more slowly than the CO2-efflux rates under the new environments. Leaf mass per area also changed after the transfer. We analysed whether substrate availability or ATP-consumption rates influence the respiratory acclimation. Since the addition of sucrose to leaf segments did not influence the O2-uptake rates, the change of respiratory substrate availability was not responsible for the respiratory acclimation. The addition of an uncoupler induced increases in the O2-uptake rates, and the degree of enhancement significantly decreased after the transfer from low to high irradiance. Thus, the change in ATP-consumption rates was responsible for the changes in respiratory rates in the plants transferred from low to high light. Potential rates of O2 uptake, as measured in the presence of both the substrate and the uncoupler, changed after the transfer, and strongly correlated with the O2-uptake rates, irrespective of the directions of transfer (r = 0·961). There was a strong correlation between maximal activities of NAD-isocitrate dehydrogenase and the potential rates of O2 uptake (r = 0·933), but a weaker correlation between those of cytochrome c oxidase and the potential rates (r = 0·689). These data indicate that the changes of light environments altered the respiratory rates via the change of the respiratory ATP demand, and that the altered rates of respiration will induce the changes of the respiratory capacities.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-3040.2001.00728.x

    Articles: DFG German National Licenses
  15. 15
    Nakajima, N. ; Itoh, T. ; Takikawa, S. ; Asai, N. ; Tamaoki, M. ; Aono, M. ; Kubo, A. ; Azumi, Y. ; Kamada, H. ; Saji, H.

    Oxford, UK : Blackwell Science, Ltd
    Published 2002
    Staff View
    ISSN:
    1365-3040
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Notes:
    Antisense DNA for an ozone-inducible 1-aminocyclopropane-1-carboxylate (ACC) synthase (EC 4.4.1.14; LE-ACS6) from tomato, under the control of the cauliflower mosaic virus 35S promoter, was introduced into tobacco to generate transgenic plants. Lower rates of ozone-induced ethylene production were observed in three of seven transgenic plants than in the wild-type plants. Ozone-induced visible damage was attenuated in these three lines, and the extent of damage was positively related to the level of ozone-induced ethylene production. In the most ozone-resistant line, ozone-induced accumulation of ACC and levels of transcripts for ozone-inducible endogenous ACC synthases were suppressed compared with those in wild-type plants, demonstrating that ozone-inducible ACC synthases have a key role in the expression of leaf damage by ozone exposure. No significant differences in growth and morphology were observed between transgenic and wild-type plants. Stomatal conductance of transgenic plants during ozone exposure was higher than that of wild-type plants. These findings indicate that the introduction of antisense DNA for an ozone-inducible ACC synthase can improve the ozone tolerance of plants without reducing their gas absorption and productivity.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-3040.2002.00862.x

    Articles: DFG German National Licenses
  16. 16
    Nakajima, N. ; Sado, T.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-4781
    Keywords:
    Amino acid sequence homology ; Lamin A ; Nuclear envelope ; Nucleotide sequence
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-4781(93)90072-L

    Articles: DFG German National Licenses
  17. 17
    SHIBATA, T. ; YAMASHITA, T. ; NAKAJIMA, N. ; UEDA, M. ; ISHIJIMA, T. ; SHIGEZUMI, M. ; ARISUE, M.

    Oxford UK : Blackwell Science Ltd
    Published 2002
    Staff View
    ISSN:
    1365-2842
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    Summary Eminoplasty using T-shaped titanium miniplate was performed on 15 joints in nine patients suffering from recurrent dislocation of the temporomandibular joint with several general complications. After the conventional pre-auricular approach to the zygomatic arch and eminence, the bent over miniplate was inserted anteriorly against the articular eminence and fixed to the zygomatic arch with miniscrews to limit the over-movement of the condyle. In one case, the miniplate fractured, but no recurrence of dislocation was observed. In another case, it was possible to evaluate the mandibular movement by Sirognathograph analysis, which proved satisfactory function of the joints.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-2842.2002.00900.x

    Articles: DFG German National Licenses
  18. 18
    Yamaguchi, T. ; Nakajima, N. ; Kuwayama, H. ; Ito, Y. ; Iwasaki, A. ; Arakawa, Y.

    Oxford, UK : Blackwell Science Ltd
    Published 2000
    Staff View
    ISSN:
    1365-2036
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    Background: Helicobacter pylori causes gastritis and is strongly associated with gastroduodenal ulcer and gastric cancer. The bacterium is associated with an increased rate of epithelial proliferation, which can be reversed by eradication of the organism. The mechanism of this response is not known, but this epithelial proliferation is one of the risk factors for developing gastric carcinoma. Recently, apoptosis also was found to be increased in the gastric mucosa of persons carrying H. pylori. Methods: cagA-positive H. pylori isolated from a human gastric ulcer was inoculated into BALB/C mice. At 4, 6, 12, 18 and 24 weeks, mice were injected with bromodeoxyuridine 5 mg/kg and killed 1 h later. Proliferation was analysed by histochemical staining for BrdU; apoptosis was examined by the TUNEL assay. Results: The number of BrdU-labelled cells in the antrum was significantly increased by H. pylori infection beginning 12 weeks after infection. The number of apoptotic cells in this tissue was increased significantly by 6 weeks after inoculation. Conclusion: The proliferation observed in H. pylori infection may be a response to increased apoptosis.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-2036.2000.014s1068.x

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    0922-338X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0922-338X(90)90142-J

    Articles: DFG German National Licenses
  20. 20
    Kunimatsu, K. ; Aramata, A. ; Nakajima, N. ; Kita, H.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0022-0728
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0022-0728(86)87078-4

    Articles: DFG German National Licenses