Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies (2009)
Takami, Hajime, Nishimichi, Takahiro, Sato, Katsuhiko
We find statistically significant spatial correlations between the arrival directions of the highest energy cosmic rays (HECRs) observed by the Akeno Giant Air Shower Array (AGASA) and large-scale...
Takami, Hajime, Sato, Katsuhiko
The propagation trajectories of the highest energy cosmic rays can be deflected by Galactic magnetic field (GMF) and expected correlation between their arrival directions and the positions of their...
Formation of Nuclear "Pasta" in Supernovae (2009)
Watanabe, Gentaro, Sonoda, Hidetaka, Maruyama, Toshiki, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
In supernova cores, nuclear "pasta" phases such as triangular lattice of rod-like nuclei and layered structure of slab-like nuclei are considered to exist. However, it is still unclear whether or not...
Non-thermal neutrinos from supernovae leaving a magnetar (2008)
Horiuchi, Shunsaku, Suwa, Yudai, Takami, Hajime, Ando, Shin'ichiro, Sato, Katsuhiko
Under the fossil field hypothesis of the origin of magnetar magnetic fields, the magnetar inherits its magnetic field from its progenitor. We show that during the supernova of such a progenitor,...
9.6 A 150MHz Graphics Rendering Processor with 256Mb Embedded DRAM (2008)
Aurangzeb K. Khan, Hidetaka Magoshi, Tadashi Matsumoto, Katsuhiko Sato, Yujiro Yamashita, Kinying Kwan, ...
A 150MHz graphics rendering processor with 256Mb Embedded DRAM (eDRAM), delivers a rendering rate of 75M Polygons/s. 287.5M transistors (7.5M logic, 280M in 256Mb eDRAM) are integrated on one...
Cross-Correlation between UHECR Arrival Distribution and Large-Scale Structure (2008)
Takami, Hajime, Nishimichi, Takahiro, Yahata, Kazuhiro, Sato, Katsuhiko
We investigate correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and the large-scale structure (LSS) of the universe by using statistical quantities which can find...
Thermodynamic potential of a mechanical constitutive model for two-phase band flow (2008)
Sato, Katsuhiko, Yuan, Xue-Feng, Kawakatsu, Toshihiro
Starting from a simple mechanical constitutive model (the non-local diffusive Johnson-Segalman model; DJS model), we provide a rigorous theoretical explanation as to why a unique value of the stress...
Implications to Sources of Ultra-high-energy Cosmic Rays from their Arrival Distribution (2008)
Takami, Hajime, Sato, Katsuhiko
We estimate the local number density of sources of ultra-high-energy cosmic rays (UHECRs) based on the statistical features of their arrival direction distribution. We calculate the arrival...
Non-thermal neutrinos from supernovae leaving a magnetar (2008)
Horiuchi, Shunsaku, Suwa, Yudai, Takami, Hajime, Ando, Shin'ichiro, Sato, Katsuhiko
Under the fossil field hypothesis of the origin of magnetar magnetic fields, the magnetar inherits its magnetic field from its progenitor. We show that during the supernova of such a progenitor,...
Suwa, Yudai, Takiwaki, Tomoya, Kotake, Kei, Sato, Katsuhiko
We study the effects of rotation on the neutrino emission from Population III (Pop III) stars by performing a series of two-dimensional rotational collapse simulations of Pop III stellar cores. Our...
Special Relativistic Simulations of Magnetically-dominated Jets in Collapsing Massive Stars (2007)
Takiwaki, Tomoya, Kotake, Kei, Sato, Katsuhiko
We perform a series of two-dimensional magnetohydrodynamic core-collapse simulations of rapidly rotating and strongly magnetized massive stars. To study the properties of magnetic explosions for a...
Phase diagram of nuclear ``pasta' and its uncertainties in supernova cores (2007)
Sonoda, Hidetaka, Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
We examine the model dependence of the phase diagram of inhomogeneous nulcear matter in supernova cores using the quantum molecular dynamics (QMD). Inhomogeneous matter includes crystallized matter...
Distortion of Ultra-high-energy sky by Galactic Magnetic Field (2007)
Takami, Hajime, Sato, Katsuhiko
We investigate the deflections of UHE protons by Galactic magnetic field(GMF) using four conventional GMF models in order to discuss the positional correlation between the arrival distribution of...
Estimation Prospects of the Source Number Density of Ultra-high-energy Cosmic Rays (2007)
Takami, Hajime, Sato, Katsuhiko
We discuss the possibility of accurately estimating the source number density of ultra-high-energy cosmic rays (UHECRs) using small-scale anisotropy in their arrival distribution. The arrival...
Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources (2007)
Takami, Hajime, Sato, Katsuhiko
We investigate the possibility that near future observations of ultra-high-energy cosmic rays (UHECRs) can unveil their local source distribution, which reflects the observed local structures if...
Propagation of Ultra-high-energy Protons in Cosmic Magnetic Fields (2007)
Takami, Hajime, Sato, Katsuhiko
We simulate the arrival distribution of ultra-high-energy (UHE) protons by following their propagation processes in several strengths of a structured extragalactic magnetic field (EGMF). Comparing...
Gravitational Wave Background from Population III Stars (2007)
Suwa, Yudai, Takiwaki, Tomoya, Kotake, Kei, Sato, Katsuhiko
We estimate the gravitational wave (GW) background from Population III (Pop III) stars using the results from our hydrodynamic simulations (Suwa et al. 2007). We calculate gravitational waveforms...
Magnetorotational Collapse of Population III Stars (2007)
Suwa, Yudai, Takiwaki, Tomoya, Kotake, Kei, Sato, Katsuhiko
We perform a series of two-dimensional magnetorotational core-collapse simulations of Pop III stars. Changing the initial distributions of rotation and magnetic fields prior to collapse in a...
Cosmogenic neutrinos as a probe of the transition from Galactic to extragalactic cosmic rays (2007)
Takami, Hajime, Murase, Kohta, Nagataki, Shigehiro, Sato, Katsuhiko
There are two promising scenarios that explain the ankle, which is a dip in the spectrum of cosmic rays at $\sim 10^{19}$ eV. A scenario interprets the ankle as the transition from Galactic to...
Reply to 'Comment on 'Heavy element production in inhomogeneous big bang nucleosynthesis'' (2007)
Matsuura, Shunji, Fujimoto, Shin-ichirou, Hashimoto, Masa-aki, Sato, Katsuhiko
This is a reply report to astro-ph/0604264. We studied heavy element production in high baryon density region in early universe astro-ph/0507439. However it is claimed in astro-ph/0604264 that small...
Impact of nuclear "pasta" on neutrino transport in collapsing stellar cores (2007)
Sonoda, Hidetaka, Watanabe, Gentaro, Sato, Katsuhiko, Takiwaki, Tomoya, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Nuclear ``pasta'', nonspherical nuclei in dense matter, is predicted to occur in collapsing supernova cores. We show how pasta phases affect the neutrino transport cross section via weak neutral...
Sato, Katsuhiko, Kaneko, Kunihiko
An equation describing the evolution of phenotypic distribution is derived using methods developed in statistical physics. The equation is solved by using the singular perturbation method, and...
Sendouda, Yuuiti, Nagataki, Shigehiro, Sato, Katsuhiko
The mass spectrum of the primordial black holes formed by density perturbation in the radiation-dominated era of the Randall-Sundrum type-2 cosmology is given. The spectrum coincides with standard...
Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole (2006)
Fujimoto, Shin-ichiro, Kotake, Kei, Yamada, Shoichi, Hashimoto, Masa-aki, Sato, Katsuhiko
We perform two-dimensional, axisymmetric, magnetohydrodynamic simulations of the collapse of a rotating star of 40 Msun and in the light of the collapsar model of gamma-ray burst. Considering two...
Explosive Nucleosynthesis in GRB Jets Accompanied by Hypernovae (2006)
Nagataki, Shigehiro, Mizuta, Akira, Sato, Katsuhiko
Two-dimensional hydrodynamic simulations are performed to investigate explosive nucleosynthesis in a collapsar using the model of MacFadyen and Woosley (1999). It is shown that 56Ni is not produced...
Toward Radiation-Magnetohydrodynamic Simulations in Core-Collapse Supernovae (2005)
Kotake, Kei, Ohnishi, Naofumi, Yamada, Shoichi, Sato, Katsuhiko
We report a current status of our radiation-magnetohydrodynamic code for the study of core-collapse supernovae. In this contribution, we discuss the accuracy of our newly developed numerical code by...
Sato, Katsuhiko, Kaneko, Kunihiko
Fluctuations of cell state, e.g., abundances of some proteins, have attracted much attention both theoretically and experimentally. The distribution of such state over cells, however, is not only a...
Explosion Mechanism, Neutrino Burst, and Gravitational Wave in Core-Collapse Supernovae (2005)
Kotake, Kei, Sato, Katsuhiko, Takahashi, Keitaro
Core-collapse supernovae are among the most energetic explosions in the universe marking the catastrophic end of massive stars. In spite of rigorous studies for several decades, we still don't...
Takami, Hajime, Yoshiguchi, Hiroyuki, Sato, Katsuhiko
We present numerical simulations on propagation of Ultra-High Energy Cosmic Rays (UHECRs) above $10^{19}$ eV in a structured extragalactic magnetic field (EGMF) and simulate their arrival...
Quadrupole formula for Kaluza-Klein modes in the braneworld (2005)
Kinoshita, Shunichiro, Kudoh, Hideaki, Sendouda, Yuuiti, Sato, Katsuhiko
The quadrupole formula in four-dimensional Einstein gravity is a useful tool to describe gravitational wave radiation. We derive the quadrupole formula for the Kaluza-Klein (KK) modes in the...
R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae (2005)
Nishimura, Sunao, Kotake, Kei, Hashimoto, Masa-aki, Yamada, Shoichi, Nishimura, Nobuya, Fujimoto, Shinichiro, ...
We investigate $r$-process nucleosynthesis during the magnetohydrodynamical (MHD) explosion of supernova in a massive star of 13 $M_{\odot}$. Contrary to the case of the spherical explosion, jet-like...
Relic neutrino background from cosmological supernovae (2004)
Ando, Shin'ichiro, Sato, Katsuhiko
Present and future observations of supernova relic neutrinos (SRNs), i.e., a cosmological neutrino background from past core-collapse supernova explosions, potentially give us useful information...
North-South Neutrino Heating Asymmetry in Strongly Magnetized and Rotating Stellar Cores (2004)
Kotake, Kei, Yamada, Shoichi, Sato, Katsuhiko
We perform a series of two-dimensional magnetohydrodynamic simulations of supernova cores. Since the distributions of the angular momentum and the magnetic fields of strongly magnetized stars are...
Simulation of Transitions between "Pasta" Phases in Dense Matter (2004)
Watanabe, Gentaro, Maruyama, Toshiki, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Calculations of equilibrium properties of dense matter predict that at subnuclear densities nuclei can be rodlike or slablike. To investigate whether transitions between phases with non-spherical...
Magneto-driven Shock Waves in Core-Collapse Supernova (2004)
Takiwaki, Tomoya, Kotake, Kei, Nagataki, Shigehiro, Sato, Katsuhiko
We perform a series of two-dimensional magnetohydrodynamic simulations of the rotational core-collapse of a magnetized massive star. We employ a realistic equation of state and take into account the...
Sendouda, Yuuiti, Kohri, Kazunori, Nagataki, Shigehiro, Sato, Katsuhiko
We investigate cosmic-ray antiprotons emitted from the galactic primordial black holes in the Randall-Sundrum type-2 braneworld. The recent results of the BESS antiproton observation implies the...
Sato, Katsuhiko, Toda, Akihiko
A simple model for the peeling process of pressure-sensitive adhesive tape is presented. The model consists of linear springs and dashpots and can be solved analytically. Based on the modeling, the...
Matsuura, Shunji, Dolgov, Alexander. D., Nagataki, Shigehiro, Sato, Katsuhiko
We study the impact of possible high density baryonic bubbles on the early formed QSO, IGM, and metal poor stars. Such bubbles could be created, under certain conditions, in Affleck-Dine model of...
Yoshiguchi, Hiroyuki, Nagataki, Shigehiro, Sato, Katsuhiko
Recently, the High Resolution Fly's Eye (HiRes) experiment claims that there is no small scale anisotropy in the arrival distribution of ultra-high energy cosmic rays (UHECRs) above $E>10^{19}$ eV...
Kotake, Kei, Yamada, Shoichi, Sato, Katsuhiko, Sumiyoshi, Kohsuke, Ono, Hiroyuki, Suzuki, Hideyuki
We perform a series of two-dimensional, axisymmetric, magnetohydrodynamic simulations of the rotational collapse of a supernova core. In order to calculate the waveforms of the gravitational wave, we...
Phases of hot nuclear matter at subnuclear densities (2003)
Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Structure of hot dense matter at subnuclear densities is investigated by quantum molecular dynamics (QMD) simulations. We analyze nucleon distributions and nuclear shapes using two-point correlation...
Nuclear pasta structure in hot neutron stars (2003)
Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Structure of cold and hot dense matter at subnuclear densities is investigated by quantum molecular dynamics (QMD) simulations. Obtained phase diagrams show that the density of the phase boundaries...
Ando, Shin'ichiro, Sato, Katsuhiko
Resonant spin-flavour (RSF) conversions of supernova neutrinos, which is induced by the interaction between the nonzero neutrino magnetic moment and supernova magnetic fields, are studied for both...
Sendouda, Yuuiti, Nagataki, Shigehiro, Sato, Katsuhiko
We investigate the spectral shape of a high-energy diffuse photon emitted by evaporating primordial black holes (PBHs) in the Randall-Sundrum type II (RS2) braneworld. In their braneworld scenario,...
Structure of cold nuclear matter at subnuclear densities by Quantum Molecular Dynamics (2003)
Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Structure of cold nuclear matter at subnuclear densities for the proton fraction $x=0.5$, 0.3 and 0.1 is investigated by quantum molecular dynamics (QMD) simulations. We demonstrate that the phases...
Gravitational Radiation from Axisymmetric Rotational Core Collapse (2003)
Kotake, Kei, Yamada, Shoichi, Sato, Katsuhiko
We have done a series of two-dimensional hydrodynamic simulations of the rotational collapse of a supernova core in axisymmetry. We have employed a realistic equation of state (EOS) and taken into...
Supernova Neutrinos, Neutrino Oscillations, and the Mass of the Progenitor Star (2003)
Takahashi, Keitaro, Sato, Katsuhiko, Burrows, Adam, Thompson, Todd A.
We investigate the initial progenitor mass dependence of the early-phase neutrino signal from supernovae taking neutrino oscillations into account. The early-phase analysis has advantages in that it...
Ando, Shin'ichiro, Sato, Katsuhiko
We study the resonant spin-flavor (RSF) conversion of supernova neutrinos, which is induced by the interaction between the nonzero neutrino magnetic moment and the supernova magnetic fields, and its...
Arrival Distribution of Ultra-High Energy Cosmic Rays: Prospects for the Future (2003)
Yoshiguchi, Hiroyuki, Nagataki, Shigehiro, Sato, Katsuhiko
We predict the arrival distribution of UHECRs above $4 \times 10^{19}$ eV with the event number expected by future experiments in the next few years. We perform event simulations with the source...
Ando, Shin'ichiro, Sato, Katsuhiko
We investigate resonant spin-flavor (RSF) conversions of supernova neutrinos which are induced by the interaction of neutrino magnetic moment and supernova magnetic fields. From the formulation which...
Supernova relic neutrinos and observational implications for neutrino oscillation (2002)
Ando, Shin'ichiro, Sato, Katsuhiko
We investigate the flux of supernova relic neutrinos (SRN) for several neutrino oscillation models with parameters inferred from recent experimental results. In the calculation, we adopt the...
Upper limit on the mass of RX J1856.5--3754 as a possible quark star (2002)
Kohri, Kazunori, Iida, Kei, Sato, Katsuhiko
Recent deep Chandra LETG+HRC-S observations suggest the possibility that RX J1856.5--3754 is a compact star whose radiation radius is 3.8--8.2 km. In this paper, we systematically calculate the...
Microscopic Study of Slablike and Rodlike Nuclei: Quantum Molecular Dynamics Approach (2002)
Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Structure of cold dense matter at subnuclear densities is investigated by quantum molecular dynamics (QMD) simulations. We succeeded in showing that the phases with slab-like and rod-like nuclei etc....
Microscopic Study of Nuclear "Pasta" by Quantum Molecular Dynamics (2001)
Watanabe, Gentaro, Sato, Katsuhiko, Yasuoka, Kenji, Ebisuzaki, Toshikazu
Structure of cold dense stellar matter at subnuclear densities is investigated with quantum molecular dynamics (QMD). We succeeded in showing that the phases with slab-like and rod-like nuclei etc....
Determining the Supernova Direction by its Neutrinos (2001)
Ando, Shin'ichiro, Sato, Katsuhiko
Supernova neutrinos, which arrive at Earth earlier than light, allow for the earliest determination of the direction of the supernova. The topic of this paper is to study how accurately we can...
Formation of Nuclear "Pasta" in Cold Neutron Star Matter (2001)
Iida, Kei, Watanabe, Gentaro, Sato, Katsuhiko
Formation and decay of rod-like and slab-like nuclei, as may be encountered in the outer parts of neutron stars, are examined within a zero-temperature stability analysis with respect to...
Effects of Neutrino Trapping on Thermodynamic Properties of Nuclear ``Pasta'' (2000)
Watanabe, Gentaro, Iida, Kei, Sato, Katsuhiko
Geometrical structure of matter at subnuclear densities is investigated in the presence of a degenerate gas of neutrinos as encountered in stellar collapse. The crystalline phases with spherical,...
Numerical Analysis of the Wave Function of the Multidimensional Universe (2000)
Ochiai, Hirotaka, Sato, Katsuhiko
In the framework of the Hartle-Hawking no-boundary proposal, we investigate quantum creation of the multidimensional universe with the cosmological constant $\Lambda$ but without matter fields. In...
Dynamical Properties of Euclidean Solutions in a Multidimensional Cosmological Model (2000)
Ochiai, Hirotaka, Sato, Katsuhiko
In the framework of the Hartle-Hawking no-boundary proposal, we investigated quantum creation of the multidimensional universe with a cosmological constant ($\Lambda$) but without matter fields. We...
Thermodynamic properties of nuclear "pasta" in neutron star crusts (2000)
Watanabe, Gentaro, Iida, Kei, Sato, Katsuhiko
Equilibrium phase diagrams for neutron star matter at subnuclear densities are obtained at zero temperature. Spherical, rod-like and slab-like nuclei as well as spherical and rod-like nuclear bubbles...
Effects of hyperons on the dynamical deconfinement transition in cold neutron star matter (1998)
The influence of the presence of hyperons in dense hadronic matter on the quantum nucleation of quark matter is examined at low temperatures relevant to neutron star cores. We calculate the equation...
Explosive Nucleosynthesis in Axisymmetrically Deformed Type II Supernovae (1997)
Nagataki, Shigehiro, Hashimoto, Masa-aki, Sato, Katsuhiko, Yamada, Shoichi
Explosive nucleosynthesis under the axisymmetric explosion in Type II supernova has been performed by means of two dimensional hydrodynamical calculations. We have compared the results with the...
Matter Mixing in Axisymmetric Supernova Explosion (1997)
Nagataki, Shigehiro, Shimizu, Tetsuya, Sato, Katsuhiko
Growth of Rayleigh-Taylor (R-T) instabilities under the axisymmetric explosion are investigated by two-dimensional hydrodynamical calculations. The degree of the axisymmetric explosion and amplitude...
Quantum Nucleation of Two-Flavor Quark Matter in Neutron Stars (1997)
Rates for nucleation of two-flavor quark matter in a neutron star core, originally composed of nuclear matter in $\beta$ equilibrium, are calculated at zero temperature by a quantum tunneling...
Massive Decaying Tau Neutrino and Big Bang Nucleosynthesis (1997)
Kawasaki, M., Kohri, K., Sato, Katsuhiko
Comparing Big Bang Nucleosynthesis predictions with the light element abundances inferred from observational data, we can obtain the strong constraints on some neutrino properties, e.g. number of...
Big Bang Nucleosynthesis and Lepton Number Asymmetry in the Universe (1996)
Kohri, K., Kawasaki, M., Sato, Katsuhiko
Recently it is reported that there is the discrepancy between big bang nucleosynthesis theory and observations (BBN crisis). We show that BBN predictions agree with the primordial abundances of light...
Spin-Down of Neutron Stars and Compositional Transitions in the Cold Crustal Matter (1996)
Transitions of nuclear compositions in the crust of a neutron star induced by stellar spin-down are evaluated at zero temperature. We construct a compressible liquid-drop model for the energy of...
Totani, Tomonori, Sato, Katsuhiko
The neutrino spin-flavor conversion of \bar\nu_e and \nu_\mu which is induced by the interaction of the Majorana neutrino magnetic moment and magnetic fields in the collapse-driven supernova is...
Effects of Neutrino Oscillation on the Supernova Relic Neutrino Background (1996)
Totani, Tomonori, Sato, Katsuhiko
We investigate to what extent the oscillation or conversion of neutrinos enhances the expected event rate of the supernova relic neutrino background (SRN) at the Super-Kamiokande detector (SK). The...
Spectrum of the Supernova Relic Neutrino Background and Evolution of Galaxies (1995)
Totani, Tomonori, Sato, Katsuhiko, Yoshii, Yuzuru
The spectrum of the supernova relic neutrino background (SRN) from collapse-driven supernovae ever occurred in the universe is calculated by using a realistic, time-dependent supernova rate derived...
Spectrum of the relic neutrino background from past supernovae and cosmological models (1995)
Totani, Tomonori, Sato, Katsuhiko
It is greatly expected that the relic neutrino background from past supernovae is detected by Superkamiokande (SK) which is now under construction. We calculate the spectrum and the event rate at SK...
The University of Tokyo, Theoretical Astrophysics Group (UTAP)
Sato, Katsuhiko, Suto, Yasushi
An official site of the UTAP (The University of Tokyo, Theoretical Astrophysics Group). The group works on the research on three specific areas of research interest; "Physics of the Early Universe",...
On the relation between fluctuation and response in biological systems
Sato, Katsuhiko, Ito, Yoichiro, Yomo, Tetsuya, Kaneko, Kunihiko
A general relationship between fluctuation and response in a biological system is presented. The fluctuation is given by the variance of some quantity, whereas the response is given as the average...
Cloning of a Novel Gene for Quinolone Resistance from a Transferable Plasmid in Shigella flexneri 2b
Hata, Mami, Suzuki, Masahiro, Matsumoto, Masakado, Takahashi, Masao, Sato, Katsuhiko, Ibe, Shiro, ...
A novel gene for quinolone resistance was cloned from a transferable plasmid carried by a clinical isolate of Shigella flexneri 2b that was resistant to fluoroquinolones. The plasmid conferred...
Isolation of an Influenza C Virus Introduced into Japan by a Traveler from Malaysia
Matsuzaki, Yoko, Sato, Katsuhiko, Sugawara, Kanetsu, Takashita, Emi, Muraki, Yasushi, Morishita, Takayuki, ...
An influenza C virus was isolated from a Japanese traveler who had visited Malaysia in April 1999. Phylogenetic analysis indicated that the genome composition of this virus was distinct from that of...
Comparison of the Mutation Rates of Human Influenza A and B Viruses
Nobusawa, Eri, Sato, Katsuhiko
Human influenza A viruses evolve more rapidly than influenza B viruses. To clarify the cause of this difference, we have evaluated the mutation rate of the nonstructural gene as revealed by the...
On the relation between fluctuation and response in biological systems
Sato, Katsuhiko, Ito, Yoichiro, Yomo, Tetsuya, Kaneko, Kunihiko
A general relationship between fluctuation and response in a biological system is presented. The fluctuation is given by the variance of some quantity, whereas the response is given as the average...
Cloning of a Novel Gene for Quinolone Resistance from a Transferable Plasmid in Shigella flexneri 2b
Hata, Mami, Suzuki, Masahiro, Matsumoto, Masakado, Takahashi, Masao, Sato, Katsuhiko, Ibe, Shiro, ...
A novel gene for quinolone resistance was cloned from a transferable plasmid carried by a clinical isolate of Shigella flexneri 2b that was resistant to fluoroquinolones. The plasmid conferred...
Isolation of an Influenza C Virus Introduced into Japan by a Traveler from Malaysia
Matsuzaki, Yoko, Sato, Katsuhiko, Sugawara, Kanetsu, Takashita, Emi, Muraki, Yasushi, Morishita, Takayuki, ...
An influenza C virus was isolated from a Japanese traveler who had visited Malaysia in April 1999. Phylogenetic analysis indicated that the genome composition of this virus was distinct from that of...
Comparison of the Mutation Rates of Human Influenza A and B Viruses
Nobusawa, Eri, Sato, Katsuhiko
Human influenza A viruses evolve more rapidly than influenza B viruses. To clarify the cause of this difference, we have evaluated the mutation rate of the nonstructural gene as revealed by the...
The University of Tokyo, Theoretical Astrophysics Group (UTAP)
Sato, Katsuhiko, Suto, Yasushi
An official site of the UTAP (The University of Tokyo, Theoretical Astrophysics Group). The group works on the research on three specific areas of research interest; "Physics of the Early Universe",...
A Nationwide Epidemic of Influenza C Virus Infection in Japan in 2004▿
Matsuzaki, Yoko, Abiko, Chieko, Mizuta, Katsumi, Sugawara, Kanetsu, Takashita, Emi, Muraki, Yasushi, ...
During the period from January to July 2004, a total of 131 influenza C viruses were detected by cell culture or reverse transcription-PCR (RT-PCR) from specimens that were obtained from children...