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Norio Nakatsuji,Eihachiro Kawase,Takamichi Miyazaki,Itsunari Minami,Kazuhiro Aiba 한국조직공학과 재생의학회 2013 조직공학과 재생의학 Vol.10 No.4
We are recently developing novel technologies for large-scale production of high-quality human pluripotent stem cells (hPSCs) by development of defined and robust adhesion molecules for hPSCs as well as other culture technologies. We are also working on control of stem cells with chemical compounds and micro-fabricated materials for growth and differentiation of ES/iPS cells in collaboration with chemical biology groups and micro-engineering groups. So far, we have identified novel small molecules which can induce efficient and robust cardiomyocyte differentiation from many human ES and iPS cell lines in completely defined and xeno-free conditions. Finally, we have created and investigated various model cells from human ES and iPS cell lines. They include neurodegenerative disease model cells, such as Alzheimer, ALS and Huntington disease models, which are produced by genetic modification of stem cell lines and differentiation into relevant cells in each disease.
The analysis of Japanese vowel by using Real-Time Spectral Analysis
Hideto Nakatsuji,Sigeru Omatu 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
In recent year, wavelet transform has been paid attention as an analysis in time-frequency domain. Furthermore, a new analytical method with the same function of wavelet transform was presented by authors. In this method, the spectrum calculation is performed by only one input data and high-speed processing performed. In this paper, by using this analytical method for the analysis of the Japanese vowel sound, and we show how a Japanese vowel sound consists of it. There are five vowel sounds in Japanese, and these vowels consist of fundamental, harmonics and high frequency waves, and so we show how these waves affect the decision of the Japanese vowel sound.
Magnetic Order Induced by Fe Doping in the Intermediate Valence System β-YbAlB4
K. Kuga,S. Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have succeeded in doping Fe at the Al site in the intermediate valence and quantum criticalmaterial β-YbAlB4 up to 6%. Our measurements of the magnetization and the specific heat for-YbAl0.94Fe0.06B4 show magnetic ordering at 10 K. The antiferromagnetic Weiss temperature of88 K, which is smaller than the 110 K for β-YbAlB4, indicates that Fe doping suppresses the Kondotemperature and induces magnetism, driving the system away from the quantum critical point.
Single-crystal Study on the Low-temperature Magnetism of the Pyrochlore Magnet Pr2Zr2O7
Kenta Kimura,Satoru Nakatsuji,A. Agung Nugroho 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
A single-crystal study on the low-temperature magnetism of a pyrochlore magnet Pr2Zr2O7 hasbeen carried out. The temperature dependence of the magnetic susceptibility shows no magneticordering at temperatures down to 1.9 K. The Curie-Weiss behavior was observed at temperaturesbelow 10 K, yielding an effective moment µeff = 2.5µB. This result, combined with those of recentreports on other Pr3+ pyrochlore magnets, suggests that the ground state of the Pr3+ crystal electricfield is a well-separated magnetic doublet. An anisotropic magnetization process is observed at lowertemperatures, and the saturated magnetization values along the three high-symmetry directions areconsistent with a local h111i Ising anisotropy with a magnetic moment gJJ = µeff = 2.5µB.
Low Temperature Transport Properties of the Quadrupolar Kondo Lattice System PrTi2Al20
Akito Sakai,Satoru Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the low temperature transport properties of the cubic Γ3 compound PrTi2Al20. This is a quadrupolar Kondo lattice system where the nongmagnetic quadrupoles, which form a long-range order at low temperatures, have strong hybridization with the conduction electrons. A sharp drop of the resistivity due to a ferroquadrupole ordering is observed at TQ = 2.0 K. The T2 dependence of the resistivity and the large Sommerfeld coefficient γ above TQ suggest the formation of a heavy-fermion state. The temperature dependence of the resistivity below TQ does not show a power law but exponential law behavior, indicating the emergence of an anisotropy gap Δ in the collective mode associated with the ferroquadrupole order below TQ. The Fisher- Langer relation holds around TQ, suggesting the higher order scattering processes than those in Born approximation are not dominant for this ferroquadrupole ordering.
( Chao Hsuan Chen ),( Yan Han Wang ),( Teruaki Nakatsuji ),( Yu Tsueng Liu ),( Christos C. Zouboulis ),( Richard L. Gallo ),( Liangfang Zhang ),( Ming Fa Hsieh ),( Chun Ming Huang ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.4
Free fatty acids (FFAs) are known to have bacteriocidal activity and are important components of the innateimmune system. Many FFAs are naturally present in human and animal skin, breast milk, and in the bloodstream. Here, the therapeutic potential of FFAs against methicillin-resistant Staphylococcus aureus (MRSA) is demonstrated in cultures and in mice. Among a series of FFAs, only oleic acid (OA) (C18:1, cis-9) can effectively eliminate Staphylococcus aureus (S. aureus) through cell wall disruption. Lauric acid (LA, C12:0) and palmitic acid (PA, C16:0) do not have this ability. OA can inhibit growth of a number of Gram-positive bacteria, including hospital and community-associated MRSA at a dose that did not show any toxicity to human sebocytes. The bacteriocidal activities of FFAs were also demonstrated in vivo through injection of OA into mouse skin lesions previously infected with a strain of MRSA. In conclusion, our results suggest a promising therapeutic approach against MRSA through boosting the bacteriocidal activities of native FFAs, which may have been co-evolved during the interactions between microbes and their hosts.
Reduction of Stress Concentration at Stop-Hole by Bolting a Crack
Toshiyuki Ishikawa,Shogo Kiyokawa,Wataru Nakatsuji 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6
A stop-hole, which is drilling at the crack tip, is one of the famous tentative repairs of fatigue cracks in steel structures. When the crack becomes longer, the stress concentration of the stop-hole also increases. Therefore, during the tentative repair of long fatigue cracks, the chances for re-initiation of the fatigue cracks from the stop holes are high. The bolting stop-hole method is a useful technique against fatigue cracks. In this technique, bolting is applied only for the stop-holes at the crack tips. Therefore, as the crack length increases, the eff ect of the bolting stop-hole method decreases. In this paper, the authors propose a stress concentration reduction technique for a stop-hole by bolting the fatigue crack between stop-holes. The eff ect of the proposed technique was verifi ed by tensile and bending tests of specimens as well as fi nite element analysis. From the tensile and bending tests, it was clarifi ed that the stress concentration of the stop-hole was drastically reduced by bolting a crack under the condition before the slippage of bolts. Additionally, multi-bolting cracks have the advantage of improving the slippage load of the bolts in a crack. Furthermore, fi nite element analysis verifi ed the reduction in stress concentration of the stop-hole by bolting a crack, and the eff ectiveness of bolting cracks and stop-holes was also shown.