Search Results - (Author, Cooperation:M. Naganuma)
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1Latest Papers from Table of Contents or Articles in PressM. Naganuma ; S. Sekine ; Y. E. Chong ; M. Guo ; X. L. Yang ; H. Gamper ; Y. M. Hou ; P. Schimmel ; S. Yokoyama
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-06-12Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Adenosine Monophosphate/analogs & derivatives/chemistry ; Alanine-tRNA Ligase/*chemistry ; Archaeoglobus fulgidus/*enzymology/*genetics ; *Base Pairing ; Base Sequence ; Catalytic Domain ; Crystallography, X-Ray ; Kinetics ; Models, Molecular ; RNA, Transfer, Ala/*chemistry/*genetics ; Substrate Specificity ; *Transfer RNA AminoacylationPublished by: -
2Articles: DFG German National LicensesNotomi, M. ; Naganuma, M. ; Nishida, T. ; Tamamura, T. ; Iwamura, H. ; Nojima, S. ; Okamoto, M.
Woodbury, NY : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: We have fabricated ultranarrow InGaAs/InP buried quantum well wires by means of electron beam lithography and reverse mesa wet etching. Owing to the reverse mesa etching profile, the lateral dimension of the wires has been reduced to 10 nm. Furthermore, we investigated the optical characteristics of these wires by photoluminescence and observed, for the first time, clear dependence of luminescence wavelength upon the wire width even for wires down to 10 nm, which is well explained by the theoretical calculation. The blue-shifted shoulder structures were also observed and they were assigned theoretically to be the second quantized level.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesMiyazawa, T. ; Kagawa, T. ; Iwamura, H. ; Mikami, O. ; Naganuma, M.
Woodbury, NY : American Institute of Physics (AIP)
Published 1989Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: A novel two-wavelength p-i-n demultiplexer is proposed and fabricated using dopant-free partial disordering of GaAs/AlAs quantum wells by rapid thermal annealing. A crosstalk attenuation of 41 dB and an interchannel spacing of 69 nm were achieved in the 0.8 μm wavelength region.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesNaganuma, M. ; Song, J. J. ; Kim, Y. B. ; Masselink, W. T. ; Morkoç, H. ; Vreeland, T.
[S.l.] : American Institute of Physics (AIP)
Published 1986Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Ultralow-power, high-resolution, pulsed-laser photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies were carried out in molecular-beam-epitaxial GaAs/AlxGa1−xAs multi-quantum-well structures at 5 K. Fine structures were observed for the first time in the PLE spectra, both in the heavy-hole and light-hole excitonic regions. Most of the fine structures are considered to arise from monolayer fluctuations in the thicknesses of the GaAs wells. Dramatic changes in the line shapes and the peak positions of the PL and PLE spectra were observed by applying selective PL detection and excitation spectroscopic techniques.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesNaganuma, M. ; Ishibashi, T. ; Horikoshi, Y.
[S.l.] : American Institute of Physics (AIP)
Published 1987Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Photoluminescence spectra were measured with molecular-beam epitaxy grown layers containing five different single quantum wells in an electric field. The photoluminescence intensity changed with the applied bias voltage in various ways according to the well width. An anti-Stokes shift in the peak energy was observed with the 2- and 3-nm quantum wells, while normal quantum confined Stark shifts were observed in the quantum wells with larger widths. These results were qualitatively interpreted in terms of the recombination rates both at the hetero-interfaces and in the quantum wells. Experimental results suggest that the impurity concentration at an interface between AlGaAs and an overlying GaAs layer is higher than that at an interface between GaAs and an overlying AlGaAs layer.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0022-0248Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyGeosciencesPhysicsType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0022-0248Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyGeosciencesPhysicsType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0022-0248Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyGeosciencesPhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1432-069XKeywords: Phototoxicity ; Lemon oil ; Photopigmentation ; Oxypeucedanin ; FurocoumarinSource: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Summary Lemon oil contains furocoumarin derivatives and is known to cause phototoxicity. In this study, lemon oil was fractionated, and its phototoxic activity was measured by means of a biological assay. The substances producing phototoxicity were identified by high-performance liquid chromatography as being oxypeucedanin and bergapten. The phototoxic potency of oxypeucedanin was only one-quarter of that of bergapten. However, the amounts of these two phototoxic compounds present in lemon oils produced in different regions of the world varied by a factor of more than 20 (bergapten, 4–87 ppm; oxypeucedanin, 26–728 ppm), and their ratio was not constant. The two compounds accounted for essentially all of the phototoxic activity of all lemon-oil samples. Among various other citrus-essential oils investigated, lime oil and bitter-orange oil also contained large amounts of oxypeucedanin. Oxypeucedanin was found to elicit photopigmentation on colored-guinea-pig skin without preceding visible erythema.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 0040-6090Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1432-1920Keywords: Hereditary motor and sensory neuropathy type III ; Sural nerve ; Magnetic resonance imagingSource: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Abstract We investigated two patients with herediatary motor and sensory neuropathy type III, one with Déjérine-Sottas disease and the other with congenital hypomyelination neuropathy based on nerve pathology and MRI of the sciatic nerve. On biopsy of the sural nerve of the patient with Déjérine-Sottas disease, myelin debris, indicating demyelination, was observed in an onion-bulb pattern surrounding myelinated fibres. In the patient with congenital hypomyelination neuropathy, onion bulbs were formed of two parallel layers of basement membrane. There was no evidence of myelin breakdown. On axial T2-weighted MRI, a severely hypertropied sciatic nerve containing multiple rounded lesions, suggesting inflammation or demyelination, was observed in the patient with Déjérine-Sottas disease. In contrast, the sciatic nerve of the patient with congenital hypomyelination neuropathy showed slight hypertrophy without demyelination. MRI of the sciatic nerve may represent a useful tool for characterisation of demyelinating disease and its prognosis.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1432-1920Keywords: Key words Hereditary motor and sensory neuropathy type III ; Sural nerve ; Magnetic resonance imagingSource: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Abstract We investigated two patients with hereditary motor and sensory neuropathy type III, one with Déjérine-Sottas disease and the other with congenital hypomyelination neuropathy based on nerve pathology and MRI of the sciatic nerve. On biopsy of the sural nerve of the patient with Déjérine-Sottas disease, myelin debris, indicating demyelination, was observed in an onion-bulb pattern surrounding myelinated fibres. In the patient with congenital hypomyelination neuropathy, onion bulbs were formed of two parallel layers of basement membrane. There was no evidence of myelin breakdown. On axial T2-weighted MRI, a severely hypertropied sciatic nerve containing multiple rounded lesions, suggesting inflammation or demyelination, was observed in the patient with Déjérine-Sottas disease. In contrast, the sciatic nerve of the patient with congenital hypomyelination neuropathy showed slight hypertrophy without demyelination. MRI of the sciatic nerve may represent a useful tool for characterisation of demyelinating disease and its prognosis.Type of Medium: Electronic ResourceURL: