H. Ohta

Publication List Details

Period

1972 - 9999

Number

153

Co-Authors

Immediate and Consolidation Deformations of Clay (9999)

Ohta,H., Hata,S.

General stress-void ratio relations of anisotropically preconsolidated clay in elastic and elastic-plastic states are derived from the basic characteristics of clay on the consolidation process...

Strength of Dynamically Compacted Soils (9999)

Ohta,H., Hata,S.

The consolidation and shear strength characteristics of partly saturated soil compacted by the application of static pressure are investigated. The constant volume shear strengths of soil compacted...

Induced Anisotropy and Time Dependency in Clays (9999)

Sekiguchi,H., Ohta,H.

This paper is concerned with stress-induced anisotropy and with time dependency in anisotropically, normally consolidated clays. The stress-induced anisotropy is related to stress reversal effect on...

Cosmic Ray Tests of the Prototype TPC for the ILC Experiment (2009)

Ackermann, K., Arai, S., Arogancia, D. C., Bacala, A. M., Ball, M., Behnke, T., ...

A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments...

Canonical models of filtered $A_\infty$-algebras and Morse complexes (2008)

Fukaya, K., Ohta, H., Ono, K.

The purpose of this paper is two-fold. First we explain the construction of the canonical model of filtered $A_\infty$-algebras given in the authors' book [FOOO]. The canonical model plays a crucial...

Lagrangian Floer theory on compact toric manifolds II : Bulk deformations (2008)

Fukaya, K., Ohta, H., Ono, K.

This is a continuation of part I in the series of the papers on Lagrangian Floer theory on toric manifolds. Using the deformations of Floer cohomology by the ambient cycles, which we call bulk...

59Co, 23Na, and 1H NMR Studies of Double-Layer Hydrated Superconductors NaxCoO2-yH2O (2008)

Itoh, Y., Ohta, H., Michioka, C., Kato, M., Yoshimura, K.

We present our NMR studies of double-layer hydrated cobalt oxides NaxCoO2-yH2O (x ~ 0.35, y ~ 1.3) with various Tc = 0 - 4.8 K and magnetic transition temperatures. High-resolution $^{1}$H NMR...

Lagrangian Floer theory on compact toric manifolds I (2008)

Fukaya, K., Ohta, H., Ono, K.

The present authors introduced the notion of \emph{weakly unobstructed} Lagrangian submanifolds and constructed their \emph{potential function} $\mathfrak{PO}$ purely in terms of $A$-model data in...

Coherent and Incoherent States of Electron-doped SrTiO3 (2007)

Ishida, Y., Eguchi, R., Matsunami, M., Horiba, K., Taguchi, M., Chainani, A., ...

Resonant photoemission at the Ti 2p and O 1s edges on a Nb-doped SrTiO3 thin film revealed that the coherent state (CS) at the Fermi level (EF) had mainly Ti 3d character whereas the incoherent...

Communications, SAC-4(6):833--846, September 1986. [77] C. Ed. Topolcic. (2007)

Experimental Internet Stream, Kotikalapudi Sriram, W. Verbiest, Y. Yasuda, H. Yasuda, H. Ohta

4, Florence, Italy, May 1992. [68] Larry Press. Commercialization of the Internet. Communications of the ACM, 37(11):17--21, November 1994. [69] G. Ramamurthy and B. Sengupta. Modeling and analysis...

A GEM TPC End-Panel Pre-Prototype (2007)

Ishikawa, A., Aoza, A., Higashi, T., Sugiyama, A., Tsuji, H., Kato, Y., ...

A GEM TPC end panel pre-prototype was constructed for a large LC-TPC prototype to test its basic design philosophy and some of its engineering details. Its interim test results are presented.

Thermoelectrical properties of A-site substituted Ca1_x Rex MnO3 system (2006)

Flahaut, D., Mihara, T., Funahashi, R., Nabeshima, N., Lee, K., Ohta, H., ...

CaMnO3 is an electron-doped compound which belongs to the perovskite family. Despite its high Seebeck coefficient S value, the figure of merit at high temperature remains low due to its large...

New polarization effect and collective excitation in S=1/2 quasi 1D antiferromagnetic quantum spin chain (2006)

Demishev, S. V., Semeno, A. V., Ohta, H., Okubo, S., Tarasenko, I. E., Ishchenko, T. V., ...

Anomalous polarization characteristics of magnetic resonance in CuGeO3 doped with 2% of Co impurity are reported. For the Faraday geometry this mode is damped for the microwave field Bw aligned along...

High frequency study of the orbital ordering resonance in the strongly correlated heavy fermion metal CeB6 (2006)

Demishev, S. V., Semeno, A. V., Ohta, H., Okubo, S., Paderno, Yu. B., Shitsevalova, N. Yu., ...

We report results of the study of the recently discovered magnetic resonance in the orbitally ordered phase of CeB6 (the orbital ordering resonance) in a wide frequency range 44-360 GHz. It is found...

ESR Probing of Quantum Critical Phenomena in Doped S=1/2 AF Quantum Spin Chain (2006)

Demishev, S. V., Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Tarasenko, I. E., Ohta, H., ...

The results of high frequency (60-315 GHz) studies of the ESR in CuGeO3 single crystals containing 0.9% of the Mn impurity are reported. The quantitative ESR line shape analysis shows that the low...

Whole-head SQUID System in a Superconducting Magnetic Shield (2006)

H Ohta, T Matsui, Y Uchikawa

We have constructed a mobile whole-head SQUID system in a superconducting magnetic shield - a cylinder of high Tc superconductor BSCCO of 65 cm in diameter and 160cm in length. We compared the noise...

Whole-head SQUID System in a Superconducting Magnetic Shield (2006)

H Ohta, T Matsui, Y Uchikawa

We have constructed a mobile whole-head SQUID system in a superconducting magnetic shield - a cylinder of high Tc superconductor BSCCO of 65 cm in diameter and 160cm in length. We compared the noise...

Whole-head SQUID System in a Superconducting Magnetic Shield (2006)

H Ohta, T Matsui, Y Uchikawa

We have constructed a mobile whole-head SQUID system in a superconducting magnetic shield - a cylinder of high Tc superconductor BSCCO of 65 cm in diameter and 160cm in length. We compared the noise...

Whole-head SQUID System in a Superconducting Magnetic Shield (2006)

H Ohta, T Matsui, Y Uchikawa

We have constructed a mobile whole-head SQUID system in a superconducting magnetic shield - a cylinder of high Tc superconductor BSCCO of 65 cm in diameter and 160cm in length. We compared the noise...

In-plane Anisotropy of the Magnetic Fluctuations in NaxCoO2-yH2O (2006)

Michioka, C., Itoh, Y., Ohta, H., Kato, M., Yoshimura, K.

We report the $^{59}$Co NMR studies of the in-plane anisotropy of bilayer hydrated Na$_{x}\mathrm{CoO_{2}} \cdot$$y\mathrm{H_{2}O}$ using a oriented powder sample by a magnetic field in Fluorinert...

Configuration mixing calculation for complete low-lying spectra with the mean-field Hamiltonian (2006)

Shinohara, S., Ohta, H., Nakatsukasa, T., Yabana, K.

We propose a new theoretical approach to ground and low-energy excited states of nuclei extending the nuclear mean-field theory. It consists of three steps: stochastic preparation of many Slater...

23Na NMR study of non-superconducting double-layer hydrate NaxCoO2.yH2O (2006)

Ohta, H., Itoh, Y., Michioka, C., Yoshimura, K.

We report 23Na NMR studies of the polycrystalline samples of double-layer hydrated cobalt oxides NaxCoO2.yH2O (x ~ 0.35 and y ~ 1.3) with the superconducting transition temperatures Tc < 1.8K and...

Nuclear Excitations Described by Randomly Selected Multiple Slater Determinants (2006)

Shinohara, S., Ohta, H., Nakatsukasa, T., Yabana, K.

We propose a new stochastic method to describe low-lying excited states of finite nuclei superposing multiple Slater determinants without assuming generator coordinates a priori. We examine accuracy...

Potential Profiling of the Nanometer-Scale Charge Depletion Layer in n-ZnO/p-NiO Junction Using Photoemission Spectroscopy (2006)

Ishida, Y., Ohta, H., Hirano, M., Fujimori, A., Hosono, H.

We have performed a depth-profile analysis of an all-oxide p-n junction diode n-ZnO/p-NiO using photoemission spectroscopy combined with Ar-ion sputtering. Systematic core-level shifts were observed...

59Co Nuclear Quadrupole Resonance Studies of Superconducting and Non-superconducting Bilayer Water Intercalated Sodium Cobalt Oxides NaxCoO2.yH2O (2006)

Michioka, C., Ohta, H., Itoh, Y., Yoshimura, K.

We report 59Co nuclear quadrupole resonance (NQR) studies of bilayer water intercalated sodium cobalt oxides NaxCoO2.yH2O (BLH) with the superconducting transition temperatures, 2 K < T_c

Proposal of A New Structure Thermal Vacuum Sensor with Diode-Thermistors Combined with a Micro-Air-Bridge Heater (2006)

Kimura, M., Sakurai, F., Ohta, H., Terada, T., Patino Lopez, L., Gomès, S.

A new structure thermal vacuum sensor with two pn junction diodes, Th-A and Th-B, as a high sensitive temperature sensor working like a thermistor and a micro heater formed on a micro air bridge is...

Proposal of A New Structure Thermal Vacuum Sensor with Diode-Thermistors Combined with a Micro-Air-Bridge Heater (2006)

Kimura, M., Sakurai, F., Ohta, H., Terada, T., Patino Lopez, L., Gomès, S.

A new structure thermal vacuum sensor with two pn junction diodes, Th-A and Th-B, as a high sensitive temperature sensor working like a thermistor and a micro heater formed on a micro air bridge is...

Temperature Dependence of the Chemical Potential in NaxCoO2: Implications for the Large Thermoelectric Power (2005)

Ishida, Y., Ohta, H., Fujimori, A., Hosono, H.

We have performed a temperature-dependent photoemission study of a NaxCoO2 (x~0.8) epitaxial thin film prepared by the reactive solid-phase epitaxy method. The chemical potential shift as a function...

High field x-ray diffraction study on a magnetic-field-induced valence transition in YbInCu4 (2005)

Matsuda, Y. H., Inami, T., Ohwada, K., Murata, Y., Nojiri, H., Murakami, Y., ...

We report the first high-field x-ray diffraction experiment using synchrotron x-rays and pulsed magnetic fields exceeding 30 T. Lattice deformation due to a magnetic-field-induced valence transition...

23Na NMR Studies of Non-superconducting and Superconducting Na0.35CoO2-1.3H2O (Tc < 1.8 and ~ 4.5 K) (2005)

Ohta, H., Itoh, Y., Michioka, C., Yoshimura, K.

We report 23Na NMR studies of the polycrystalline samples of bilayer hydrated cobalt oxides Na0.35CoO2-1.3H2O with the superconducting transition temperatures Tc < 1.8 and ~ 4.5 K. The magnitude of...

Quantum critical behavior induced by Mn impurity in CuGeO3 (2005)

Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Pronin, A. A., Ohta, H., Okubo, S., ...

Results of high frequency (60-315 GHz) studies of ESR in CuGeO3 single crystals containing 0.9% of Mn impurity are reported. Quantitative EPR line shape analysis allowed concluding that low...

$^{23}$Na NMR Study of Layered Superconductor $Na_xCoO_2- yH_2O$ (2005)

Ohta, H., Michioka, C., Itoh, Y., Yoshimura, K., Sakurai, H., Takayama-Muromachi, E., ...

We measured $^{23}$Na-NMR spectra and nuclear spin-lattice relaxation rates $^{23}(1/T_1)$ of superconducting and non-superconducting bilayer hydrate $Na_xCoO_2-yH_2O$ (x ~ 0.3, y ~ 1.3). The central...

Proposal of A New Structure Thermal Vacuum Sensor with Diode-Thermistors Combined with a Micro-Air-Bridge Heater (2005)

Kimura, M., Sakurai, F., Ohta, H., Terada, T.

A new structure thermal vacuum sensor with two pn junction diodes, Th-A and Th-B, as a high sensitive temperature sensor working like a thermistor and a micro heater formed on a micro...

Proposal of A New Structure Thermal Vacuum Sensor with Diode-Thermistors Combined with a Micro-Air-Bridge Heater (2005)

Kimura, M., Sakurai, F., Ohta, H., Terada, T.

A new structure thermal vacuum sensor with two pn junction diodes, Th-A and Th-B, as a high sensitive temperature sensor working like a thermistor and a micro heater formed on a micro...

The Competition between Staggered Field and Antiferromagnetic Interactions in Cugeo3:Fe (2004)

Demishev, S. V, Semeno, A. V., Pronin, A. A., Sluchanko, N. E., Samarin, N. A., Ohta, H., ...

The EPR spectra along different crystallographic axes for single crystals of CuGeO3 containing 1% of Fe impurity have been studied in the frequency range 60-360 GHz at temperatures 0.5-30 K. The...

Quantum Critiality and Collective Effects in Low Dimensional Magnet CuGeO3 Probed by High Frequency EPR (2004)

Demishev, S. V, Semeno, A. V., Pronin, A. A., Sluchanko, N. E., Samarin, N. A., Ohta, H., ...

For the CuGeO3 single crystals doped with 1% of Fe the quantum critical behavior in a wide temperature range 1-40 K is reported. The critical exponents for susceptibility along different...

Disorder driven quantum critical behavior in CuGeO3 doped with magnetic impurity (2004)

Demishev, S. V., Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Pronin, A. A., Glushkov, V. V., ...

For the CuGeO3 doped with 1% of Fe the quantum critical behavior in a wide temperature range 1-40 K is reported. The critical exponents for susceptibility along different crystallographic axes are...

High Frequency EPR Spectroscopy of Germanium Cuprate. I. The Case of Doping with Cobalt (2004)

Demishev, S. V., Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Pronin, A. A., Inagaki, Y., ...

Resonant magnetoabsorption spectra for CuGeO3 single crystals containing 2% of Co impurity are studied in the frequency range 60-360 GHz in magnetic field up to 16 T at temperatures 2-60 K. It is...

Quantum critical point in CuGeO3 doped with magnetic impurities (2003)

Demishev, S. V., Inagaki, Y., Markina, M. M., Ohta, H., Okubo, S., Oshima, Y., ...

Using high frequency (up to 450 GHz) ESR and low temperature specific heat measurements we find that insertion of 1% Fe and 2% Co damps spin-Peierls and Neel transitions and for T

Fermi Surface Study of Quasi-Two-Dimensional Organic Conductors by Magnetooptical Measurements (2002)

Oshima, Y., Ohta, H., Koyama, K., Motokawa, M., Yamamoto, H. M., Kato, R., ...

Magnetooptical measurements of several quasi-two-dimensional (q2D) organic conductors, which have simple Fermi surface structure, have been performed by using a cavity perturbation technique. Despite...

Bulk-sensitive Photoemission of Mn5Si3 (2002)

Irizawa, A., Yamasaki, A., Okazaki, M., Kasai, S., Sekiyama, A., Imada, S., ...

We have carried out a bulk-sensitive high-resolution photoemission experiment on Mn5Si3. The measurements are performed for both core level and valence band states. The Mn core level spectra are...

Magneto-optical probe of antiferromagnetic sub-phases in a pi- d electronic system (2002)

Rutel, I., Okubo, S., Ohta, H., Tanaka, H., Kobayashi, H., Brooks, J.

The highly insulating antiferromagnetic phase of the magnetic- organic conductor lambda-(BETS)2FeCl4 has been probed by resonant mm wave methods vs. magnetic field, temperature, and frequency. Our...

Observation of High-Order Harmonic Resonances in Magnetooptical Measurements of (BEDT-TTF)2Br(DIA) (2002)

Oshima, Y., Ohta, H., Koyama, K., Motokawa, M., Yamamoto, H. M., Kato, R.

Magnetooptical measurements of a quasi-two-dimensional (q2D) organic conductor (BEDT-TTF)2Br(DIA) (DIA=diiodoacetylene) were performed using a cavity perturbation technique with a millimeter vector...

Magnetism of C-60-Based molecular complexes: High-field-magnetization and magnetooptical study (2002)

Sluchanko, NE, Weckhuysen, L, Ohta, H, Okubo, S, ...

Magnetization study of the C-60 . TMTSF . 2CS(2) molecular complex in magnetic fields up to 47 T for the temperature range 1.8-300 K and ESR spectroscopy of the molecular complex (ET)(2)C-60 at T =...

Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder (2001)

Demishev, S. V., Bunting, R. V., Pronin, A. A., Sluchanko, N. E., Samarin, N. A., Ohta, H., ...

Influence of doping by iron impurity on spin-Peierls state in CuGeO3 is studied. ESR measurements for the frequency/temperature domain 60-450 GHz/ 1.8-300 K and specific heat data obtained for the...

Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO3 (1999)

Nojiri, H., Ohta, H., Okubo, S., Fujita, O., Akimitsu, J., Motokawa, M.

Transitions between the ground singlet state to the excited triplet state has been observed in CuGeO3 by means of submillimeter wave electron spin resonance. The strong absorption intensity shows the...

Estimation of the Effective Thermal Conductivity and the Analysis of Temperature Response in the Transient State for Composite Materials. (1998)

Ohta, H., Tomota, Y.

A review with 81 refs., on fundamental equations of heat transfer, estn. of the effective thermal cond. and temp. response in the transient state of such composite materials as laminates, particle...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

ON THE EXCESS CAPACITY CONTROVERSY (1977)

OHTA, H.

This paper critically reviews and resolves some controversies on the so-called “excess capacity” theorem that allegedly are deducible from the theory of monopolistic competition. The fundamental...

CHARGE-TRANSFER QUENCHING OF SINGLET EXCIPLEXES (1975)

Creed, David, Wine, P. H., Melton, L. A., Ohta, H., Caldwell, Richard A.

This work was supported, in part, by The Robert A. Welch Foundation.""

Fabrication of small microbridges (1974)

Chiao, R.Y., Feldman, M. J., Ohta, H., Parrish, P.T.

A simple, versatile technique for making very small, sturdy, reproducible microbridges is described. When exposed to air, to mechanical shock, or to repeated temperature cycling, the junctions do not...

Four photon parametric amplification (1974)

Parrish, P.T., Feldman, M. J., Ohta, H., Chiao, R.Y.

An analysis is presented describing four-photon parametric amplification in an unbiased Josephson junction. Central to the theory is the model of the Josephson effect as a nonlinear inductance....

Semimetal barrier planar Josephson junction (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The semimetal barrier planar junction is an excellent candidate for a millimeter-wave detector. It has a high resistance and a very small capacitance, it is electrically and mechanically stable, and...

Sensitivity of Josephson-effect millimeter-wave radiometer (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The noise temperature and the minimum detectable temperature of a Josephson junction in video detection of microwave and millimeter-wave radiation has been calculated. We use the well-known method...

Fabrication of small microbridges (1974)

Chiao, R.Y., Feldman, M. J., Ohta, H., Parrish, P.T.

A simple, versatile technique for making very small, sturdy, reproducible microbridges is described. When exposed to air, to mechanical shock, or to repeated temperature cycling, the junctions do not...

Four photon parametric amplification (1974)

Parrish, P.T., Feldman, M. J., Ohta, H., Chiao, R.Y.

An analysis is presented describing four-photon parametric amplification in an unbiased Josephson junction. Central to the theory is the model of the Josephson effect as a nonlinear inductance....

Semimetal barrier planar Josephson junction (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The semimetal barrier planar junction is an excellent candidate for a millimeter-wave detector. It has a high resistance and a very small capacitance, it is electrically and mechanically stable, and...

Sensitivity of Josephson-effect millimeter-wave radiometer (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The noise temperature and the minimum detectable temperature of a Josephson junction in video detection of microwave and millimeter-wave radiation has been calculated. We use the well-known method...

Fabrication of small microbridges (1974)

Chiao, R.Y., Feldman, M. J., Ohta, H., Parrish, P.T.

A simple, versatile technique for making very small, sturdy, reproducible microbridges is described. When exposed to air, to mechanical shock, or to repeated temperature cycling, the junctions do not...

Four photon parametric amplification (1974)

Parrish, P.T., Feldman, M. J., Ohta, H., Chiao, R.Y.

An analysis is presented describing four-photon parametric amplification in an unbiased Josephson junction. Central to the theory is the model of the Josephson effect as a nonlinear inductance....

Semimetal barrier planar Josephson junction (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The semimetal barrier planar junction is an excellent candidate for a millimeter-wave detector. It has a high resistance and a very small capacitance, it is electrically and mechanically stable, and...

Sensitivity of Josephson-effect millimeter-wave radiometer (1974)

Ohta, H., Feldman, M. J., Parrish, P.T., Chiao, R.Y.

The noise temperature and the minimum detectable temperature of a Josephson junction in video detection of microwave and millimeter-wave radiation has been calculated. We use the well-known method...

Long-range interaction between the P2.1 and P9.1 peripheral domains of the Tetrahymena ribozyme.

Ikawa, Y, Ohta, H, Shiraishi, H, Inoue, T

The Tetrahymena ribozyme possesses peripheral domains, termed P9.1 and P9.2. They are nonessential in the mechanism of the catalytic reaction but contribute to enhance the catalytic activity of the...

Molecular cloning and mapping of 16S-23S rRNA gene complexes of Staphylococcus aureus.

Wada, A, Ohta, H, Kulthanan, K, Hiramatsu, K

Staphylococcus aureus BB255, a derivative of NCTC8325, had six rRNA operons, and each operon contained two SmaI sites about 3 kb apart. By molecular cloning and pulsed-field gel electrophoresis, all...

Peptide sequences for sucrose splitting and glucan binding within Streptococcus sobrinus glucosyltransferase (water-insoluble glucan synthetase).

Abo, H, Matsumura, T, Kodama, T, Ohta, H, Fukui, K, Kato, K, ...

The gene encoding glucosyltransferase responsible for water-insoluble glucan synthesis (GTF-I) of Streptococcus sobrinus (formerly Streptococcus mutans 6715) was cloned, expressed, and sequenced. A...

Purification and properties of two membrane alkaline phosphatases from Bacillus subtilis 168.

Sugahara, T, Konno, Y, Ohta, H, Ito, K, Kaneko, J, Kamio, Y, ...

Two alkaline phosphatases were extracted from the membranes of Bacillus subtilis 168 stationary-phase cells and purified as homogeneous proteins by hydroxyapatite column chromatography. Alkaline...

Kinetic study of a change in intracellular ATP level associated with aerobic catabolism of ethanol by Streptococcus mutans.

Fukui, K, Kato, K, Kodama, T, Ohta, H, Shimamoto, T, Shimono, T

Streptococcus mutans, a group of lactic acid bacteria and a normal inhabitant of the human oral cavity, generates ATP by substrate-level phosphorylation coupled to oxidation of ethanol (an end...

Cloning and expression in Escherichia coli of Vibrio parahaemolyticus thermostable direct hemolysin and thermolabile hemolysin genes.

Taniguchi, H, Ohta, H, Ogawa, M, Mizuguchi, Y

Two hemolysin genes of Vibrio parahaemolyticus WP1, a thermostable direct (TSD) hemolysin gene and a thermolabile hemolysin gene, were cloned into the pBR322 vector in Escherichia coli K-12 C600. A...

Fusion regulation proteins on the cell surface: isolation and characterization of monoclonal antibodies which enhance giant polykaryocyte formation in Newcastle disease virus-infected cell lines of human origin.

Ito, Y, Komada, H, Kusagawa, S, Tsurudome, M, Matsumura, H, Kawano, M, ...

Newcastle disease virus (NDV)-infected HeLa and FL cells showed small polykaryocytes at about 24 h postinfection, while the addition of anti-FL-cell rabbit, rat, or mouse serum to the NDV-infected...

Effect of complement depletion by cobra venom factor on fowlpox virus infection in chickens and chicken embryos.

Ohta, H, Yoshikawa, Y, Kai, C, Yamanouchi, K, Taniguchi, H, Komine, K, ...

The course of infection with an attenuated strain of fowlpox virus (FPV), which is known to induce antibody-independent activation of complement via the alternative pathway, was investigated in 1- to...

Nuclease-sensitive binding of an Actinobacillus actinomycetemcomitans leukotoxin to the bacterial cell surface.

Ohta, H, Kato, K, Kokeguchi, S, Hara, H, Fukui, K, Murayama, Y

A leukotoxin of Actinobacillus actinomycetemcomitans 301-b was solubilized from cell-associated membrane vesicles by treatment with externally added DNase and RNase and was further purified by a...

Effects of oxygen on glucose-limited growth of Streptococcus mutans.

Kodama, T, Fukui, K, Shimamoto, T, Ohta, H, Kokeguchi, S, Kato, K

Aerotolerance in the growth of Streptococcus mutans and related streptococci was examined under glucose-limited conditions. The growth rate of all strains tested was more or less retarded when they...

Activation of chicken alternative complement pathway by fowlpox virus-infected cells.

Ohta, H, Kai, C, Yoshikawa, Y, Yamanouchi, K

Fresh normal chicken serum (NCS) which lacked virus-neutralizing antibody to fowlpox virus (FPV) was found to inhibit the appearance of the cytopathic effect of the virus, virus growth, and plaque...

Saliva-binding region of Streptococcus mutans surface protein antigen.

Nakai, M, Okahashi, N, Ohta, H, Koga, T

A 190-kDa surface protein antigen (PAc) of Streptococcus mutans binds to human salivary components. For detection of specific binding of the PAc protein to human salivary components, a simple...

Association of Actinobacillus actinomycetemcomitans leukotoxin with nucleic acids on the bacterial cell surface.

Ohta, H, Hara, H, Fukui, K, Kurihara, H, Murayama, Y, Kato, K

Actinobacillus actinomycetemcomitans, a periodontopathic gram-negative bacterium, produces a leukotoxin that is a member of the RTX cytotoxin family. Although genes may function in toxin secretion,...

Estrogen deficiency stimulates B lymphopoiesis in mouse bone marrow.

Masuzawa, T, Miyaura, C, Onoe, Y, Kusano, K, Ohta, H, Nozawa, S, ...

We have found that an estrogen deficiency causes a marked increase in bone marrow cells. To examine the effect of estrogen on hemopoiesis, we characterized the increased population of bone marrow...

Molecular and biological characterization of fusion regulatory proteins (FRPs): anti-FRP mAbs induced HIV-mediated cell fusion via an integrin system.

Ohta, H, Tsurudome, M, Matsumura, H, Koga, Y, Morikawa, S, Kawano, M, ...

Anti-FRP mAbs induced polykaryocyte formation of U2ME-7 cells (CD4+U937 cells transfected with the HIV gp160 gene). Anti-FRP-1 mAb immunoprecipitated gp80-85, gp120 and homodimers of these peptides,...

Characterization of brush borders purified in iso-osmotic medium and microvillar membranes subfractionated from mouse small intestine.

Fujita, M, Ohta, H, Uezato, T

Brush borders free of nuclei were isolated by repeated homogenization and centrifugation in iso-osmotic medium. They showed typical morphology under electron microscopy. The mean recovery and...

Sphingosine 1-phosphate stimulates proliferation and migration of human endothelial cells possibly through the lipid receptors, Edg-1 and Edg-3.

Kimura, T, Watanabe, T, Sato, K, Kon, J, Tomura, H, Tamama, K, ...

Sphingosine 1-phosphate (S1P) stimulates thymidine incorporation (DNA synthesis), cell growth and cell migration in human aortic endothelial cells (HAECs). The extent of the S1P-induced responses are...

Extracellular mechanism through the Edg family of receptors might be responsible for sphingosine-1-phosphate-induced regulation of DNA synthesis and migration of rat aortic smooth-muscle cells.

Tamama, K, Kon, J, Sato, K, Tomura, H, Kuwabara, A, Kimura, T, ...

Exogenous sphingosine 1-phosphate (S1P) increased cytosolic Ca(2+) concentration, stimulated thymidine incorporation (DNA synthesis) and inhibited cell migration in rat aortic smooth-muscle cells...

Coupling of Metabolism and Bioconversion: Microbial Esterification of Citronellol with Acetyl Coenzyme A Produced via Metabolism of Glucose in an Interface Bioreactor

Oda, S., Inada, Y., Kobayashi, A., Kato, A., Matsudomi, N., Ohta, H.

Microbial esterification of citronellol with acetyl coenzyme A (acetyl-CoA) produced via metabolism of glucose was performed with Hansenula saturnus IFO 0809 in an interface bioreactor by using a...

Non-enzymic glycation of human extracellular superoxide dismutase.

Adachi, T, Ohta, H, Hirano, K, Hayashi, K, Marklund, S L

The secretory enzyme extracellular superoxide dismutase (EC-SOD) is in plasma heterogenous with regard to heparin-affinity and can be divided into three fractions, A that lacks affinity, B with...

Chemical constituents of peppers (Piper spp.) and application to food preservation: naturally occurring antioxidative compounds.

Nakatani, N, Inatani, R, Ohta, H, Nishioka, A

In a structure analysis of the compounds of the genus Piper (Family Piperaceae), we identified five phenolic amides from Piper nigrum, seven compounds from P. retrofractum, and two compounds from P....

Long-range interaction between the P2.1 and P9.1 peripheral domains of the Tetrahymena ribozyme.

Ikawa, Y, Ohta, H, Shiraishi, H, Inoue, T

The Tetrahymena ribozyme possesses peripheral domains, termed P9.1 and P9.2. They are nonessential in the mechanism of the catalytic reaction but contribute to enhance the catalytic activity of the...

Molecular cloning and mapping of 16S-23S rRNA gene complexes of Staphylococcus aureus.

Wada, A, Ohta, H, Kulthanan, K, Hiramatsu, K

Staphylococcus aureus BB255, a derivative of NCTC8325, had six rRNA operons, and each operon contained two SmaI sites about 3 kb apart. By molecular cloning and pulsed-field gel electrophoresis, all...

Peptide sequences for sucrose splitting and glucan binding within Streptococcus sobrinus glucosyltransferase (water-insoluble glucan synthetase).

Abo, H, Matsumura, T, Kodama, T, Ohta, H, Fukui, K, Kato, K, ...

The gene encoding glucosyltransferase responsible for water-insoluble glucan synthesis (GTF-I) of Streptococcus sobrinus (formerly Streptococcus mutans 6715) was cloned, expressed, and sequenced. A...

Purification and properties of two membrane alkaline phosphatases from Bacillus subtilis 168.

Sugahara, T, Konno, Y, Ohta, H, Ito, K, Kaneko, J, Kamio, Y, ...

Two alkaline phosphatases were extracted from the membranes of Bacillus subtilis 168 stationary-phase cells and purified as homogeneous proteins by hydroxyapatite column chromatography. Alkaline...

Kinetic study of a change in intracellular ATP level associated with aerobic catabolism of ethanol by Streptococcus mutans.

Fukui, K, Kato, K, Kodama, T, Ohta, H, Shimamoto, T, Shimono, T

Streptococcus mutans, a group of lactic acid bacteria and a normal inhabitant of the human oral cavity, generates ATP by substrate-level phosphorylation coupled to oxidation of ethanol (an end...

Cloning and expression in Escherichia coli of Vibrio parahaemolyticus thermostable direct hemolysin and thermolabile hemolysin genes.

Taniguchi, H, Ohta, H, Ogawa, M, Mizuguchi, Y

Two hemolysin genes of Vibrio parahaemolyticus WP1, a thermostable direct (TSD) hemolysin gene and a thermolabile hemolysin gene, were cloned into the pBR322 vector in Escherichia coli K-12 C600. A...

Fusion regulation proteins on the cell surface: isolation and characterization of monoclonal antibodies which enhance giant polykaryocyte formation in Newcastle disease virus-infected cell lines of human origin.

Ito, Y, Komada, H, Kusagawa, S, Tsurudome, M, Matsumura, H, Kawano, M, ...

Newcastle disease virus (NDV)-infected HeLa and FL cells showed small polykaryocytes at about 24 h postinfection, while the addition of anti-FL-cell rabbit, rat, or mouse serum to the NDV-infected...

Effect of complement depletion by cobra venom factor on fowlpox virus infection in chickens and chicken embryos.

Ohta, H, Yoshikawa, Y, Kai, C, Yamanouchi, K, Taniguchi, H, Komine, K, ...

The course of infection with an attenuated strain of fowlpox virus (FPV), which is known to induce antibody-independent activation of complement via the alternative pathway, was investigated in 1- to...

Nuclease-sensitive binding of an Actinobacillus actinomycetemcomitans leukotoxin to the bacterial cell surface.

Ohta, H, Kato, K, Kokeguchi, S, Hara, H, Fukui, K, Murayama, Y

A leukotoxin of Actinobacillus actinomycetemcomitans 301-b was solubilized from cell-associated membrane vesicles by treatment with externally added DNase and RNase and was further purified by a...

Effects of oxygen on glucose-limited growth of Streptococcus mutans.

Kodama, T, Fukui, K, Shimamoto, T, Ohta, H, Kokeguchi, S, Kato, K

Aerotolerance in the growth of Streptococcus mutans and related streptococci was examined under glucose-limited conditions. The growth rate of all strains tested was more or less retarded when they...

Activation of chicken alternative complement pathway by fowlpox virus-infected cells.

Ohta, H, Kai, C, Yoshikawa, Y, Yamanouchi, K

Fresh normal chicken serum (NCS) which lacked virus-neutralizing antibody to fowlpox virus (FPV) was found to inhibit the appearance of the cytopathic effect of the virus, virus growth, and plaque...

Saliva-binding region of Streptococcus mutans surface protein antigen.

Nakai, M, Okahashi, N, Ohta, H, Koga, T

A 190-kDa surface protein antigen (PAc) of Streptococcus mutans binds to human salivary components. For detection of specific binding of the PAc protein to human salivary components, a simple...

Association of Actinobacillus actinomycetemcomitans leukotoxin with nucleic acids on the bacterial cell surface.

Ohta, H, Hara, H, Fukui, K, Kurihara, H, Murayama, Y, Kato, K

Actinobacillus actinomycetemcomitans, a periodontopathic gram-negative bacterium, produces a leukotoxin that is a member of the RTX cytotoxin family. Although genes may function in toxin secretion,...

Estrogen deficiency stimulates B lymphopoiesis in mouse bone marrow.

Masuzawa, T, Miyaura, C, Onoe, Y, Kusano, K, Ohta, H, Nozawa, S, ...

We have found that an estrogen deficiency causes a marked increase in bone marrow cells. To examine the effect of estrogen on hemopoiesis, we characterized the increased population of bone marrow...

Molecular and biological characterization of fusion regulatory proteins (FRPs): anti-FRP mAbs induced HIV-mediated cell fusion via an integrin system.

Ohta, H, Tsurudome, M, Matsumura, H, Koga, Y, Morikawa, S, Kawano, M, ...

Anti-FRP mAbs induced polykaryocyte formation of U2ME-7 cells (CD4+U937 cells transfected with the HIV gp160 gene). Anti-FRP-1 mAb immunoprecipitated gp80-85, gp120 and homodimers of these peptides,...

Non-enzymic glycation of human extracellular superoxide dismutase.

Adachi, T, Ohta, H, Hirano, K, Hayashi, K, Marklund, S L

The secretory enzyme extracellular superoxide dismutase (EC-SOD) is in plasma heterogenous with regard to heparin-affinity and can be divided into three fractions, A that lacks affinity, B with...

Characterization of brush borders purified in iso-osmotic medium and microvillar membranes subfractionated from mouse small intestine.

Fujita, M, Ohta, H, Uezato, T

Brush borders free of nuclei were isolated by repeated homogenization and centrifugation in iso-osmotic medium. They showed typical morphology under electron microscopy. The mean recovery and...

Sphingosine 1-phosphate stimulates proliferation and migration of human endothelial cells possibly through the lipid receptors, Edg-1 and Edg-3.

Kimura, T, Watanabe, T, Sato, K, Kon, J, Tomura, H, Tamama, K, ...

Sphingosine 1-phosphate (S1P) stimulates thymidine incorporation (DNA synthesis), cell growth and cell migration in human aortic endothelial cells (HAECs). The extent of the S1P-induced responses are...

Extracellular mechanism through the Edg family of receptors might be responsible for sphingosine-1-phosphate-induced regulation of DNA synthesis and migration of rat aortic smooth-muscle cells.

Tamama, K, Kon, J, Sato, K, Tomura, H, Kuwabara, A, Kimura, T, ...

Exogenous sphingosine 1-phosphate (S1P) increased cytosolic Ca(2+) concentration, stimulated thymidine incorporation (DNA synthesis) and inhibited cell migration in rat aortic smooth-muscle cells...

Coupling of Metabolism and Bioconversion: Microbial Esterification of Citronellol with Acetyl Coenzyme A Produced via Metabolism of Glucose in an Interface Bioreactor

Oda, S., Inada, Y., Kobayashi, A., Kato, A., Matsudomi, N., Ohta, H.

Microbial esterification of citronellol with acetyl coenzyme A (acetyl-CoA) produced via metabolism of glucose was performed with Hansenula saturnus IFO 0809 in an interface bioreactor by using a...

Chemical constituents of peppers (Piper spp.) and application to food preservation: naturally occurring antioxidative compounds.

Nakatani, N, Inatani, R, Ohta, H, Nishioka, A

In a structure analysis of the compounds of the genus Piper (Family Piperaceae), we identified five phenolic amides from Piper nigrum, seven compounds from P. retrofractum, and two compounds from P....

Lysis of horse red blood cells mediated by antibody-independent activation of the alternative pathway of chicken complement.

Ohta, H, Yoshikawa, Y, Kai, C, Yamanouchi, K, Okada, H

Horse red blood cells (HRBC) were found to be lysed when incubated with fresh normal chicken serum (NCS). By comparison of the properties of the lysis of HRBC with those of the complement-dependent...

In vivo activation of mouse spleen lymphocytes by lipid A in carrier-free form.

Mita, A, Ohta, H, Mita, T

The immunogenic potential of lipid A, isolated from Salmonella minnesota R595 and made soluble by mild alkaline hydrolysis, was investigated using ICR mice and a modification of the Jerne plaque...

Positive inotropic and chronotropic effects of trypsin and some other proteolytic enzymes in the guinea-pig heart.

Imai, S., Kawada, T., Kimura, T., Ohta, H., Nakazawa, M., Yoshida, Y.

1 In atrial preparations of the young guinea-pig (body weight 150-250 g), five proteolytic enzymes (trypsin, chymotrypsin, bacterial-Al-proteinase (nagarse), bromelain and kallikrein) produced...

Positive inotropic effects induced by carbachol in rat atria treated with islet-activating protein (IAP)--association with phosphatidylinositol breakdown.

Imai, S., Ohta, H.

1. To elucidate the functional consequences of phosphatidyl inositol (PI) breakdown produced by activation of the muscarinic receptor of the atrial muscle, and to clarify the subtypes of the...

Contribution of cyclic GMP formation to KRN2391-induced relaxation in coronary artery of the pig.

Jinno, Y., Kasai, H., Ohta, H., Nishikori, K., Fukushima, H., Ogawa, N.

1. In the present study, we investigated the relationship between relaxation and guanosine 3':5'-cyclic monophosphate (cyclic GMP) formation induced by KRN2391, compared with those induced by...

Exclusion mapping of the hereditary dentatorubropallidoluysian atrophy gene from the Huntington's disease locus.

Kondo, I, Ohta, H, Yazaki, M, Ikeda, J E, Gusella, J F, Kanazawa, I

Hereditary dentatorubropallidoluysian atrophy (DRPLA) is an autosomal dominant neurodegenerative disorder. Clinical and genetic findings in hereditary DRPLA are very similar to those of Huntington's...

Probing a Traffic Congestion Controversy: Density and Flow Scrutinized.

Ohta, H.

Probing a die-hard traffic congestion controversy, this paper scrutinizes two key variables, density and flow, under equilibrium versus optimal states.

Endogenous Mercantilism and Oligopoly Dumping.

McGuire, M., Ohta, H.

Although the world and its global economy become more and more integrated with each passing year, not all the correlated increase in trade could be unambiguously be called free trade. A significant...

GENERAL EQUILIBRIUM OF SPATIAL PRODUCT AND LABOR MARKETS

KOHLHASE, J.E., OHTA, H.

spatial analysis ; labour market ; products ; monopolies ; technology

Sustainability in Small Open Economies Under Uncertainty.

Katayama, S., Ohta, H.

We have analysed the impact of price and other uncertainties on Hartwick's rule. It is well known, by the rule that the consumption level for a source exporting small open economy is kept constant...

Sustainability in Small Open Economies Under Uncertainty.

Katayama, S., Ohta, H.

We have analysed the impact of price and other uncertainties on Hartwick's rule. It is well known, by the rule that the consumption level for a source exporting small open economy is kept constant...

Löschian spatial competition and the related labor market

J E Kohlhase, H Ohta

A single-good Löschian model of spatial pricing is expanded to incorporate elements of the reisted input market. Technical change in the labor sector induces the entry of new firms. Short-run and...

Derivation of optimal spatial prices

M L Greenhut, H Ohta, J Greenhut

The price of a good prevailing at some local market point may or may not be identical to the price of that same good at another market point. Price differentials over regions depend in part upon the...

各種野菜及び果實の仔犬消化管通過に就て

太田, 裕, Ohta, H.

Es gibt wohl zahlreiche Experimente uber die Physiologie der Milchverdauung im Sauglingsalter, aber es scheint uns, dass bisjetzt wenig auf die Verdauungsphysiologie der Gemuse-sowie Obstarten im...

紫外線照射による催乳法の乳汁に及ぼす影響

太田, 裕, Ohta, H.

Uber die etwaige Veranderung der Beschaffenheit der Frauenmilch bei der kunstlichen Beforderung der Milchsekretion ist bisher nur wenig angegeben. Neuerdings wurde nachgewiesen, dass die...