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Search Results: 1 - 10 of 51 matches for " KEIYA ISODA "
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Genetic Diversity of Acacia mangium Seed Orchard in Wonogiri Indonesia Using Microsatellite Markers
HAYATI Journal of Biosciences , 2012,
Abstract: Genetic diversity is important in tree improvement programs. To evaluate levels of genetic diversity of first generation Acacia mangium seedling seed orchard in Wonogiri, Central Java, Indonesia, three populations from each region of Papua New Guinea (PNG) and Queensland, Australia (QLD) were selected and analyzed using 25 microsatellite markers. Statistical analysis showed that PNG populations have higher number of detected alleles and level of genetic diversity than QLD populations. This study provides a basic information about the genetic background of the populations used in the development of an A. mangium seed orchard in Indonesia.
Suppression of Superfluidity of $^4$He in a Nanoporous Glass by Preplating a Kr Layer
Yoshiyuki Shibayama,Keiya Shirahama
Physics , 2011, DOI: 10.1143/JPSJ.80.084604
Abstract: Helium in nanoporous media has attracted much interest as a model Bose system with disorder and confinement. Here we have examined how a change in porous structure by preplating a monolayer of krypton affects the superfluid properties of $^4$He adsorbed or confined in a nanoporous Gelsil glass, which has a three-dimensional interconnected network of nanopores of 5.8 nm in diameter. Isotherms of adsorption and desorption of nitrogen show that monolayer preplating of Kr decreases the effective pore diameter to 4.7 nm and broadens the pore size distribution by about eight times from the sharp distribution of the bare Gelsil sample. The superfluid properties were studied by a torsional oscillator for adsorbed film states and pressurized liquid states, both before and after the monolayer Kr preplating. In the film states, both the superfluid transition temperature $T_{\mathrm c}$ and the superfluid density decrease about 10 percent by Kr preplating. The suppression of film superfluidity is attributed to the quantum localization of $^4$He atoms by the randomness in the substrate potential, which is caused by the preplating--induced broadening of the pore size distribution. In the pressurized liquid states, the superfluid density $\rho_{\mathrm s}$ is found to increase by 10 percent by Kr preplating, whereas $T_{\mathrm c}$ is decreased by 2 percent at all pressures. The unexpected enhancement of $\rho_{\mathrm s}$ might indicate the existence of an unknown disorder effect for confined $^4$He.
Obstetric Outcomes in Women in Fukushima Prefecture during and after the Great East Japan Earthquake and Fukushima Nuclear Power Plant Accident: The Fukushima Health Management Survey  [PDF]
Masako Hayashi, Keiya Fujimori, Seiji Yasumura, Aya Goto, Akihito Nakai
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.612088
Abstract: Objective: The Great East Japan Earthquake (magnitude, 9.0) followed by a large-scale tsunami caused a severe nuclear accident at the Fukushima Daiichi Nuclear Power Plant (Tokyo Electric Company). This study aimed to evaluate the obstetric outcomes in women in Fukushima prefecture during and after the Great East Japan Earthquake and Fukushima nuclear power plant accident. Methods: We collected information for 12,300 pregnant women who conceived during the 9 months before and after the disaster in Fukushima prefecture. The data of the subjects were analyzed according to the conception date for each pregnancy. Results: Among the women who conceived within 9 months before the disaster, adverse obstetric outcomes were not observed. In contrast, in the case of women who conceived within 6 months after the disaster, an increase in the incidence of preterm birth (less than 37 weeks) and low birth weight (less than 1500 g and less than 2500 g) was observed. Moreover, these women showed an increased incidence of medical complications, such as respiratory diseases and mental disorders. Conclusion: The results of the present study show that the occurrence of adverse obstetric outcomes was higher in the women who conceived within 6 months after the disaster than in those who were pregnant at the time of the disaster. The results may be related to emotional stress such as anxiety about the disaster and emphasize the need for continued investigations and careful management of pregnant woman in disaster areas in the future.
Development of an Interaction Assay between Single-Stranded Nucleic Acids Trapped with Silica Particles and Fluorescent Compounds
T. Isoda,R. Maeda
Journal of Functional Biomaterials , 2012, DOI: 10.3390/jfb3030601
Abstract: Biopolymers are easily denatured by heating, a change in pH or chemical substances when they are immobilized on a substrate. To prevent denaturation of biopolymers, we developed a method to trap a polynucleotide on a substrate by hydrogen bonding using silica particles with surfaces modified by aminoalkyl chains ([A-AM silane]/SiO 2). [A-AM silane]/SiO 2 was synthesized by silane coupling reaction of N-2-(aminoethyl)-3-aminopropyltrimethoxysilane (A-AM silane) with SiO 2 particles with a diameter of 5 μm at 100 °C for 20 min. The surface chemical structure of [A-AM silane]/SiO 2 was characterized by Fourier transform infrared spectroscopy and molecular orbital calculations. The surface of the silica particles was modified with A-AM silane and primary amine groups were formed. [A-AM silane]/SiO 2 was trapped with single-stranded nucleic acids [(Poly-X; X = A (adenine), G (guanine) and C (cytosine)] in PBS solution at 37 °C for 1 h. The single-stranded nucleic acids were trapped on the surface of the [A-AM silane]/SiO 2 by hydrogen bonding to form conjugated materials. The resulting complexes were further conjugated by derivatives of acridine orange (AO) as fluorescent labels under the same conditions to form [AO:Poly-X:A-AM silane]/SiO 2 complexes. Changes in the fluorescence intensity of these complexes originating from interactions between the single-stranded nucleic acid and aromatic compounds were also evaluated. The change in intensity displayed the order [AO: Poly-G: A-AM silane]/SiO 2 > [AO:Poly-A:A-AM silane]/SiO 2 >> [AO:Poly-C:A-AM silane]/SiO 2. This suggests that the single-stranded nucleic acids conjugated with aminoalkyl chains on the surfaces of SiO 2 particles and the change in fluorescence intensity reflected the molecular interaction between AO and the nucleic-acid base in a polynucleotide.
Quantum Critical Phenomena of 4He in Nanoporous Media
Thomas Eggel,Masaki Oshikawa,Keiya Shirahama
Physics , 2010, DOI: 10.1103/PhysRevB.84.020515
Abstract: The superfluid transition in liquid 4He filled in Gelsil glass observed in recent experiments is discussed in the framework of quantum critical phenomena. We show that quantum fluctuations of phase are indeed important at the experimentally studied temperature range owing to the small pore size of Gelsil, in contrast to 4He filled in previously studied porous media such as Vycor glass. As a consequence of an effective particle-hole symmetry, the quantum critical phenomena of the system are described by the 4D XY universality class, except at very low temperatures. The simple scaling agrees with the experimental data remarkably well.
Superfluidity of $^4$He Confined in Nano-Porous Media
Keiya Shirahama,Keiichi Yamamoto,Yoshiyuki Shibayama
Physics , 2007, DOI: 10.1063/1.2908885
Abstract: We have examined superfluid properties of $^4$He confined to a nano-porous Gelsil glass that has nanopores 2.5 nm in diameter. The pressure-temperature phase diagram was determined by torsional oscillator, heat capacity and pressure studies. The superfluid transition temperature $T_{\mathrm c}$ approaches zero at 3.4 MPa, indicating a novel "quantum" superfluid transition. By heat capacity measurements, the nonsuperfluid phase adjacent to the superfluid and solid phases is identified to be a nanometer-scale, localized Bose condensation state, in which global phase coherence is destroyed. At high pressures, the superfluid density has a $T$-linear term, and $T_{\mathrm c}$ is proportional to the zero-temperature superfluid density. These results strongly suggest that phase fluctuations in the superfluid order parameter play a dominant role on the phase diagram and superfluid properties.
Liquid-Solid Transition and Phase Diagram of ^4He Confined in Nanoporous Glass
Keiichi Yamamoto,Yoshiyuki Shibayama,Keiya Shirahama
Physics , 2007, DOI: 10.1143/JPSJ.77.013601
Abstract: We have studied the liquid - solid (L-S) phase transition of ^4He confined in nanoporous glass, which has interconnected nanopores of 2.5 nm in diameter. The L-S boundary is determined by the measurements of pressure and thermal response during slow cooling and warming. Below 1 K, the freezing pressure is elevated to 1.2 MPa from the bulk freezing pressure, and appears to be independent of temperature. The T-independent L-S boundary implies the existence of a localized Bose-Einstein condensation state, in which long-range superfluid coherence is destroyed by narrowness of the nanopores and random potential.
Thermodynamic Evidence for Nanoscale Bose-Einstein Condensation in ^4He Confined in Nanoporous Media
Keiichi Yamamoto,Yoshiyuki Shibayama,Keiya Shirahama
Physics , 2007, DOI: 10.1103/PhysRevLett.100.195301
Abstract: We report the measurements of the heat capacity of ^4He confined in nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher than the superfluid transition temperature obtained using the torsional oscillator technique. The peak provides a definite thermodynamic evidence for the formation of localized Bose-Einstein condensates (LBECs) on nanometer length scales. The temperature dependence of heat capacity is well described by the excitations of phonons and rotons, supporting the existence of LBEC.
Adaptive Responses of Soybean and Cotton to Diurnal Changes in Solar Radiation and Leaf Movement
Inamullah,Akihiro Isoda,Nazir Hussain Shah
Asian Journal of Plant Sciences , 2006,
Abstract: Adaptive responses to diurnal changes in solar radiation and leaf movement restraint in soybean in comparison with cotton, which observes different heliotropism from that of soybean, were investigated in terms of leaf temperature (TL), Flow Rate of Stem Sap (FRSS), transpiration rate (E), stomatal conductance (gs) and stomatal aperture. Cotton showed higher FRSS and E while smaller TL than that of restrained (RLM) and Not-restrained Leaf Movement (NRLM) soybean. The RLM soybean showed higher FRSS, E at noon and TL than that of NRLM soybean. Larger FRSS and E of cotton could be attributed to its higher stomatal density, stomatal aperture, gs and the diaheliotropic leaf movement. In NRLM soybean, smaller FRSS and smaller E at noon as compared with RLM soybean might be due to the smaller abaxial stomatal aperture, gs and the paraheliotropic leaf movement. It was concluded that cotton responded to increase in diurnal solar radiation by increasing its transpiration to reduce TL. Increase in transpiration of cotton was due to increase in the size of stomatal aperture, gs and the diaheliotropic leaf movement. NRLM soybean responded to increase in solar radiation by observing paraheliotropism in order to reduce its TL while RLM soybean increased its transpiration in order to reduce TL. Increase in transpiration of RLM soybean was due to increase in abaxial stomatal aperture.
Papillary Fibroelastoma of the Papillary Muscle of the Tricuspid Valve: Reconstruction of the Papillary Muscle*  [PDF]
Susumu Isoda, Tamizo Kimura, Kenji Nishimura, Nozomu Yamanaka, Shingo Nakamura, Tadaaki Maehara
Open Journal of Thoracic Surgery (OJTS) , 2013, DOI: 10.4236/ojts.2013.33014
Abstract: Cardiac papillary fibroelastoma is the third most frequent primary cardiac tumor, after myxoma and fibroma. A papillary fibroelastoma that arises from the papillary muscle is rare. We removed a papillary fibroelastoma located at the anterior papillary muscle of the tricuspid valve. The papillary muscle needed reconstruction. We used the loop technique to adjust the length of the papillary muscle and performed annuloplasty by using an artificial ring.
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