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Search Results: 1 - 10 of 853 matches for " Mamoru Ota "
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One Case of Suspected Angiostenosis Revealed by MRA Following Carotid Endarterectomy Due to a Rare Cause  [PDF]
Yuji Endo, Naoki Sato, Hidekazu Takahashi, Mamoru Ota, Toshihito Ishikawa, Katsuhiro Endo, Kenichi Ebihara
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.83023
Abstract: We herein report on a case in which magnetic resonance angiography (MRA) following carotid endarterectomy revealed the appearance of angiostenosis due to an artifact of metallic powder, which was thought to have come from an old surgical instrument. The patient was a 77-year-old male. Carotid endarterectomy (CEA) was performed for stenosis in the internal carotid artery of his left neck (82%). Upon observing a decline in renal function following CEA surgery, a postoperative cervical MRA revealed the appearance of high-grade stenosis at the common carotid artery on which surgery was performed. No stenosis was revealed upon carotid ultrasonography and angiography. In the original MRA image, an orbicular low intensity area was observed in concordance with the narrow segment. 3D computed tomography (3D-CT) revealed a metallic finding, suggesting it was an artifact caused by metal powder. Close inspection of the metal surgical instruments used during surgery revealed slight damage to a suture snare which had been used for 30 years. Going forward, it is necessary to pay attention to old surgical instruments, introduce a system by which the number of years and the frequency of use of each surgical instrument can be learned, and replace them with new equipment as necessary.
Exploring New Socio-Economic Thoughts for a Small and Narrow Earth  [PDF]
Mamoru Kaneko
Advances in Applied Sociology (AASoci) , 2018, DOI: 10.4236/aasoci.2018.85024
Abstract: The earth has been getting smaller and narrower with the expansion of human activities. Now, it is an urgent task for social scientists to explore and study new socio-economic thoughts for this small and narrow earth. This article provides a normative theory and a descriptive theory for the present and future earth. The former is to provide, viewing the earth and human community as unity, evaluations of possible events and of designs of social institutions. The normative theory helps us think about where we should direct the earth. The latter discusses social sciences for practical management of the earth. Since, however, great diversity of cultures will remain, a unified management of the earth is practically impossible. We are required to rethink and develop new socio-economic thoughts in radical manners.
Calibration of GaAlAs Semiconductor Diode  [PDF]
S. B. Ota, Smita Ota
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310184
Abstract: The forward voltage of GaAlAs semiconductor diode has been measured in the temperature range 50 K - 300 K and for current values between 10 nA and 450 μA. The forward voltage as a function of temperature is least-squares fitted and the coefficients are given. The 1st and 2nd order least-squares fitting has high temperature root between 400 K and 950 K. The presence of the high temperature root indicates that the fitted polynomials are of similar character. The high temperature root is found to increase for the least squares fitted polynomials corresponding to higher current values.
Nature of First-Order Transition in Planar Rotator Model with Modified Potential  [PDF]
Smita Ota, Snehadri Bihari Ota
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41020
Abstract:

We have carried out micro-canonical Monte Carlosimulations of a planar rotator model in 30 × 30 lattice using periodic boundary conditions. The energy distribution of the rotator in the lattice shows features that can be associated with spin wave and vortex excitations. The results supplement the first-order transition observed in canonicalMonte Carlosimulation, due to vortex nucleation. We also see features that can be associated with the in-homogeneity of vortex charge in the critical region.

tRNA Modifying Enzymes, NSUN2 and METTL1, Determine Sensitivity to 5-Fluorouracil in HeLa Cells
Mayumi Okamoto equal contributor,Mamoru Fujiwara equal contributor,Masato Hori,Kaoru Okada,Futoshi Yazama,Hiroaki Konishi,Yegui Xiao,Guangying Qi,Fumio Shimamoto,Takahide Ota,Achim Temme,Masaaki Tatsuka
PLOS Genetics , 2014, DOI: doi/10.1371/journal.pgen.1004639
Abstract: Nonessential tRNA modifications by methyltransferases are evolutionarily conserved and have been reported to stabilize mature tRNA molecules and prevent rapid tRNA decay (RTD). The tRNA modifying enzymes, NSUN2 and METTL1, are mammalian orthologs of yeast Trm4 and Trm8, which are required for protecting tRNA against RTD. A simultaneous overexpression of NSUN2 and METTL1 is widely observed among human cancers suggesting that targeting of both proteins provides a novel powerful strategy for cancer chemotherapy. Here, we show that combined knockdown of NSUN2 and METTL1 in HeLa cells drastically potentiate sensitivity of cells to 5-fluorouracil (5-FU) whereas heat stress of cells revealed no effects. Since NSUN2 and METTL1 are phosphorylated by Aurora-B and Akt, respectively, and their tRNA modifying activities are suppressed by phosphorylation, overexpression of constitutively dephosphorylated forms of both methyltransferases is able to suppress 5-FU sensitivity. Thus, NSUN2 and METTL1 are implicated in 5-FU sensitivity in HeLa cells. Interfering with methylation of tRNAs might provide a promising rationale to improve 5-FU chemotherapy of cancer.
Observation of Vortex Lattice Related Anomalies in Polycrystalline YBa2Cu3O7-x Near the Superconducting Transition  [PDF]
S. B. Ota
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310183
Abstract: The d.c. I-V characteristic of polycrystalline YBa2Cu3O7-x high temperature superconductors (HTSC) is measured near the transition temperature (Tc). The Tc was found to be 90 K with a width of 2 K. The voltage was measured at various current values and with reversing the current. A difference in voltage was found for forward and reverse current directions near Tc. The observed directionality of the I-V characteristic can be understood in terms of quantized magnetic flux by the self-field of the current and the proximity junctions in these materials. This can also be understood qualitatively as due to the d-wave superconductivity. The measured dc voltage showed increased noise near Tc which is possibly related to 1/f noise due to the motion of Abrikosov flux lines.
Vertebral Bone Drilling (Puncture) Attenuates the Acute Pain Due to Vertebral Compression Fractures  [PDF]
Koichi Ota, Sosi Iwasaki
Open Journal of Anesthesiology (OJAnes) , 2014, DOI: 10.4236/ojanes.2014.42007
Abstract:

Purpose: The Investigational Vertebroplasty Efficacy and Safety Trial (INVEST), a randomized blinded controlled study of Vertebroplasty, demonstrated similar improvements in pain between blinded Vertebroplasty and sham-Vertebroplasty groups. The result from the RCT study suggested that the observed efficacy of the Vertebroplasty procedure, instead of representing the cement-mediated reduction in pain, may relate to the vertebral bone drilling per se. The aim of this study was to demonstrate the effectiveness of pain relief of vertebral bone drilling at the site of painful osteoporotic vertebral compression fractures in the acute phase. Materials and Methods: Twenty-six patients with painful osteoporotic compression fractures underwent the vertebral bone drilling. We assessed primary outcome measures in the NRS pain score and RDQ score at day 0 and 3 following the drilling. Comparisons were made by using Wilcoxon signed rank test. Results: The mean baseline NRS and RDQ score, and the mean NRS and RDQ score at day 3 were 7.3 ± 1.2, 15.7 ± 4.2, 4.6 ± 1.4, 7.3 ± 2.2, respectively. Among the patients, we detected significant improvements in NRS pain score and RDQ score at day 3 following the drilling compared with day 0 (P < 0.001). Conclusion: Vertebral bone drilling at the site of painful vertebral compression fractures alleviated the intractable pain due to osteoporotic vertebral compression fractures.

THE BALKANS BETWEEN THE EU AND NATO: FOCUSING ON THE FORMER YUGOSLAVIA
Mamoru Sadakata
Romanian Journal of European Affairs (RJEA) , 2006,
Abstract: The fragmentation of Yugoslavia has wrought extensive political and social changes in the Balkans and Europe more generally. After the collapse of communism and the breakup of Yugoslavia, many Balkan countries have transformed their political system and have begun to forge new foreign and security policy. Some of them have already joined the EU and NATO, and some are about to access these organizations. But the Western Balkan states seem to be farther in the future. In regard to the former Yugoslavia, the United States, European states and international organizations, such as the EU, NATO and UN, have attempted to engage and manage this breakup on an individual and collective basis. They have greatly influenced the process of the post-conflict nation building of this region. From this viewpoint, the paper discusses the political and social transformation of the Balkans after the breakup of the Yugoslav conflict, and the role of the EU and NATO in the process of the democratization and nation building in the former Yugoslavia. Moreover, attention is paid to the features of the involvement of the EU and NATO in the former Yugoslav conflict. In the process of Yugoslav fragmentation one can see the ‘Eastern Question’ revisited and the ‘Powder keg of Europe’ once again rising to its brim.
Property $(T_B)$ and Property $(F_B)$ restricted to a representation without non-zero invariant vectors
Mamoru Tanaka
Mathematics , 2011,
Abstract: In this paper, we give a necessary and sufficient condition for which a finitely generated group has a property like Kazhdan's Property $(T)$ restricted to one isometric representation on a strictly convex Banach space without non-zero invariant vectors. Similarly, we give a necessary and sufficient condition for which a finitely generated group has a property like Property $(FH)$ restricted to the set of the affine isometric actions whose linear part are one isometric representation on a strictly convex Banach space without non-zero invariant vectors. If the Banach space is the $\ell^p$ space ($1
Multi-way expansion constants and partitions of a graph
Mamoru Tanaka
Mathematics , 2011,
Abstract: In this paper, we consider a relation between $k$-way expansion constant of a finite graph and the expansion constants of subgraphs in a $k$-partition of the graph. Using this relation, we show that a sequence of finite graphs which have uniformly bounded $k+1$-way expansion constants and uniformly bounded degrees can be divided into $k$ or less sequences of expanders. Furthermore, we prove that such sequence of finite graphs is not coarsely embeddable into any Hilbert space.
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