Showing papers by "Nagoya University published in 1972"
TL;DR: The reduction of nitro blue tetrazolium (NitroBT) with NADH mediated by phenazine methosulfate (PMS) under aerobic conditions was inhibited upon addition ofsuperoxide dismutase, indicating the involvement of superoxide aninon radical in the reduction of NitroBT.
3,331 citations
TL;DR: Ionic conduction in sintered oxides of the system Bi2O3-SrO was investigated by measuring the conductivity and ion transference number under various conditions as discussed by the authors.
Abstract: Ionic conduction in sintered oxides of the system Bi2O3-SrO was investigated by measuring the conductivity and ion transference number under various conditions. The ion transference numbers were measured by an oxygen concentration cell employing the specimen as the electrolyte.
216 citations
TL;DR: In this article, the authors measured the stress distribution along a tool rake face in orthogonal machining of various metals and found that the nature of stress distribution was closely connected with the strain hardening index of work material and the frictional coefficient between tool and material.
Abstract: Stress distribution along a tool rake face were measured directly in the orthogonal machining of various metals. The method of measurement was based on the use of a composite tool which was divided into two parts parallel to a cutting edge in order to measure separately the force acting on one section of the tool. The stress distributions under actual cutting conditions were revealed, and the relationship between the nature of stress distribution and the mechanical properties of work material was clarified. It was ascertained that the nature of stress distribution was closely connected with the strain hardening index of work material and the frictional coefficient between tool and material.
148 citations
TL;DR: In this article, the lattice parameters of the α-phase, the metastable α''-phase and the stable β-phase in the Fe-Ga system containing 15∼30% Ga were determined and a phase diagram is proposed according to X-ray and magnetic measurements.
Abstract: The lattice parameters of the α-phase (disordered bcc), the metastable α''-phase (Fe 3 Al type) and the stable β-phase (Cu 3 Au type) in the Fe-Ga system containing 15∼30% Ga were determined and a phase diagram is proposed according to X-ray and magnetic measurements. The magnetic properties of these phases were investigated between 4.2 K and 1100 K. The magnetic moment per Fe atom was found to be 2.05±0.06µ B and 2.39±0.06µ B for the ordered bcc and the ordered fcc Fe 3 Ga respectively. Mossbauer measurements on the α'' and β phases were carried out and the internal fields were estimated to be 274 kOe for the fcc Fe 3 Ga and 230 and 360 kOe for the A and D sites respectively of the bcc Fe 3 Al-type Fe 3 Ga. Large quadrupole interactions were found in the fcc Fe 3 Ga and its spin direction is suggested to be along . Some discussions are given in the last section.
137 citations
TL;DR: It is suggested that the effect of calcium ions on troponin can be transferred to F-actin by altering the binding between tropomyosin and several monomer units in F-actsin.
121 citations
113 citations
TL;DR: In this article, the reductive perturbation method is applied to the Vlasov equation which governs the one dimensional motion of collisionless plasmas, and it is possible to investigate the nonlinear modulation of the plasma waves with an arbitrary dispersion.
Abstract: The reductive perturbation method is applied to the Vlasov equation which governs the one dimensional motion of collisionless plasmas The present formulation makes it possible to investigate the nonlinear modulation of the plasma waves with an arbitrary dispersion Structures of the resulting nonlinear Schrodinger equation have been studied explicitly for the electron plasma wave and for the ion plasma wave
97 citations
TL;DR: No sign of degenerative changes was evident in the ultrastructure of protoplasts even after the virus had multiplied to a maximum level.
86 citations
TL;DR: In this article, a detailed theoretical study has been made of the nucleation model for wall motion in ferroelectrics, and general formulae for absolute wall velocities in various field ranges have been derived.
Abstract: Detailed theoretical study has been made of the nucleation model for wall motion in ferroelectrics. Kinetics of the wall motion has been worked out both analytically and by simulation. The wall velocity v is expressed in terms of nucleation rate I and sideways growth velocity u s of nuclei on the wall by the formula v = c w 0 I or v =1.4 c ( u s I ) 1/2 according as w 0 2 I / u s ≫1 or w 0 2 I / u s ≪1. ( c : minimum advancement of wall, w 0 : width of critical nucleus.) The nucleation rate I and the sideways growth velocity u s have been calculated on the basis of the theory of absolute reaction rates. It is shown that at very high fields two-dimensional nuclei can not nucleate, instead one-dimensional nuclei are formed, whose nucleation rate depends on field following a power law. From these results, general formulae for absolute wall velocities in various field ranges have been derived.
81 citations
TL;DR: In this article, a new method utilizing long wave components, was developed and used in the present study resulting in many possible structures, including continental under the mountain area, oceanic under the Pacific, and intermediate under the Sea of Japan.
Abstract: Studies on the crustal structure in the profile across central Japan close to the longitude 137°E were started in 1966 with 20 explosions made off the Atumi Peninsula. In 1967, twenty-one reverse shots off the Noto Peninsula and a supplementary three-ton explosion at the Ebisu Mine were observed at stations on land specially arranged for the derivation of crustal structure. Most of the stations were equipped with magnetic-tape-recording systems which provide us a filter technique to detect signals of low S/N ratio. The quality of record was extensively increased through filtering, and the following characteristic features were revealed:A. Pn waves were extensively observed in the explosions off the Atumi Peninsula but not in those in the Sea of Japan.B. Waves belonging to a granitic layer were clearly observed in the explosions off the Noto Peninsula but were absent or almost absent in the explosions off the Atumi Peninsula except for shots near the peninsula. These marked differences suggest an asymmetric crustal structure in the profile.A time-term method is satisfactory for the derivation of sediments under the Sea of Japan, but not for the derivation of the Moho discontinuity. A new method utilizing long wave components, was developed and used in the present study resulting in many possible structures. The crustal structures thus obtained are, in general, continental under the mountain area, oceanic under the Pacific, and intermediate under the Sea of Japan. The most probable one out of many is shown Fig. 17. Gravity data were also used in the selection of the best model. The thickness of the basaltic layer remains unknown, but it should be very thin in the southern half of the profile. It forms a striking contrast with the structure in the profile along the longitude 139°E which is located within a short distance of only 220km.A velocity gradient for the upper mantle was also obtained from the explosions off the Atumi Peninsula.
80 citations
TL;DR: The polymorphic nature of bacterial flagella will be discussed, and it will be necessary to consider that homogeneous polymers themselves are polymorphic and, depending on environmental conditions, capable of assuming several stable forms homologous to those which have been associated with copolymers.
TL;DR: The mean length of reconstituted flagella is nearly equal irrespective of widely varied weight ratios of flagellin to seed at the reconstitution, provided that the ratio exceeds some critical value, which suggests that there exists some self-control mechanism in the polymerization process of flagesllin.
TL;DR: Fluorescence polarisation shows that the motion of the tyrosine residues is much smaller in the presence than in the absence of Ca++, so the Ca++ binding component of troponin appears more rigid in the arrival ofCa++.
TL;DR: In this paper, the formation of solid solution in the Co3−xMnxO4 system in atmospheres of oxygen, air and argon was examined at a constant temperature of 1000 °C.
Abstract: The formation of solid solution in the Co3−xMnxO4 system in atmospheres of oxygen, air and argon was examined at a constant temperature of 1000 °C. In oxygen, a small amount of the NaCl-type compound was found to co-exist with the cubic spinel in the composition rangex≤0.1. A single phase of the cubic spinel was found in the range 0.1 to 1.3 and the tetragonal spinel above 1.9. In the rangex=1.3 to 1.9 where the cubic and tetragonal spinels co-exist they both have very broadened diffraction line profiles. In air, the identified phases and the changes in their lattice constants with composition were very similar to those in oxygen, except that the NaCl-type compound and the cubic spinel co-existed over a larger range. In argon, the cubic spinel was not observed over any of the composition range and the NaCI-type compound and the tetragonal spinel co-existed in the wide range of 1.1 to 2.3. The experimental results are discussed with regard to the cation distribution in the spinel and also to the relative stability of Co3+- and Mn3+-ions under the low partial pressure of oxygen.
TL;DR: Mg++ like Ca++ induces a conformational change in the Ca++-binding component of troponin, but this change cannot be propagated to other muscle proteins, and therefore has no physiological meaning.
01 Apr 1972-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the compositional ranges for the σ phase in the Cr-Ni, Cr-Fe, and Cr-Co systems are from low chromium to 68, 63.4, and 62.1 wt pct Cr, respectively.
Abstract: Structural analyses were performed on alloy particles of chromium-rich Cr-Ni, Cr-Fe, Cr-Co, and Cr-Ni-Fe systems. Fine alloy particles (100 to 1000A in diameter) were prepared by evaporation of parent alloys in argon at 20 torr. In addition, alloy structures of bulk specimens of the Cr-Ni system were investigated using X-ray diffraction techniques to confirm the results obtained from the particulate alloys. In these binary systems, δ phase with W3O structure (A-15) and a phase withβ-uranium structure (D
8
) were identified in addition to the α (bcc) and γ (fcc) terminal solid solutions. The compositional ranges for the σ phase in the Cr-Ni, Cr-Fe, and Cr-Co systems are from low chromium to 68, 63.4, and 62.1 wt pct Cr, respectively. The δ phase exists in the range from pure chromium to 68, 58, and 54 wt pct Cr in the respective Cr-Ni, Cr-Fe, and Cr-Co alloy systems. Similarly, in the Cr-Ni-Fe system, it was found that δ phase occurs in the chromium corner while σ phase exists in the region bridging the two binary σ phases of the Cr-Ni and Cr-Fe systems. Possible modification of phase diagrams of these systems is discussed in view of these results.
TL;DR: It is stated that trypsin disrupts the sperm-binding site on the vitelline membrane and causes reduction of the fertilizability of the egg.
TL;DR: The Melting Temperature of Thermally Reversible Gel: as discussed by the authors The Melting temperature of reversible gel is the temperature at which the gel degrades to polyvinyl chloride.
Abstract: The Melting Temperature of Thermally Reversible Gel. I. Poly(vinyl chloride)–Organic Solvent Gels
TL;DR: This study investigated circular dichroism spectra from the two solutions, in order to compare secondary structures of flagellin before and after polymerization, and found a large difference in spectral curves.
TL;DR: It is suggested that BHK-HVJ cells would provide a convenient system for experiments to analyze the maturation steps in the growth of paramyxovirus, and the step of incorporation of hemagglutinin into the outer membrane of the cells was temperature sensitive.
TL;DR: In this article, the authors observed a neutron yield from a solid deuterium target irradiated by the beam of a glass laser, which had a power of 20 GW for 2 nsec.
Abstract: As lasers have an ability to deliver a large amount of energy very rapidly to matter, one can produce a plasma of thermonuclear temperature by laser bombardment of matter. We observed a neutron yield from a solid deuterium target irradiated by the beam of a glass laser, which had a power of 20 GW for 2 nsec. The theoretically estimated threshold laser power for anomalous heating owing to the parametric instability was in agreement with the experimental result. Above this threshold, an increase in the electron temperature, the appearance of a fast-ion group, and an anomaly in the reflection of light from the plasma were observed. These phenomena were closely correlated with the neutron yield. At the high-temperature region above a few hundred electron volts, the anomalous heating plays an essential role in reaching the fusion-reaction temperature.
01 Jan 1972
TL;DR: The temperature at which paramecia gathered in a temperature gradient cell correlated closely with the temperature of the maximum steady velocity, which had a sharp maximum at the culture temperature and decreased on both sides of this temperature.
Abstract: SYNOPSIS. The effect of temperature on the swimming velocity of Paramecium was investigated. When paramecia cultured at 25 C were transferred to various temperatures, their swimming velocity was increased immediately and then decreased exponentially with time to a new steady velocity. The relaxation time was about 1 min, independent of the new temperature. At a constant temperature the steady velocity was inversely proportional to viscosity. The velocity acceleration was observed when the sudden temperature change was larger than ± 1 C. Its magnitude became constant when the temperature change was greater than several degrees. The steady velocity as a function of temperature had a sharp maximum at the culture temperature and decreased on both sides of this temperature. Incubation of paramecia at 30 C for several hr after cultivation at 25 C shifted the maximum temperature of the steady velocity to 30 C. The temperature at which paramecia gathered in a temperature gradient cell correlated closely with the temperature of the maximum steady velocity.
TL;DR: It is likely that ovary trehalase in silkworm pupae plays an important role in glycogen accumulation in the ovaries, especially those of the diapause type, and it is suggested that the diAPause hormone may elevate its activity through de novo synthesis of the enzyme protein.
TL;DR: In this paper, a method to investigate directly the dynamical properties of dislocations was developed by means of HVEM, which was observed in thick foil specimens of Fe-Si being stretched in a VTR operated at 500 kV.
Abstract: A new method to investigate directly the dynamical properties of dislocations was developed by means of HVEM. The motions of edge and screw dislocations were observed in thick foil specimens of Fe-Si being stretched in a HVEM operated at 500 kV. The dislocation motions were recorded continuously on a video tape recorder (VTR) with the aid of an image intensifier and the corresponding stress-strain curve was also recorded simultaneously. Edge dislocations moved well below the yield stress and the frequency of their motions increased with increasing applied stress. Luders band nucleated at upper yield point and propagated in transition from upper to lower yield points. The motions of screws were observed immediately after upper yield point, accompanying dislocation multiplication. Edge dislocations had much higher mobility than screws but both of them moved much faster in comparison with the observation by etch-pitting technique.
TL;DR: The Minamata disease originates from the consumption of great amounts of fish and shellfish caught in the minamata Bay, the Kumamoto Prefecture of Kyushu, Japan, which has been polluted by methyl mercuric sulfide and methyl Mercuric chloride.
Abstract: The Minamata disease originates from the consumption of great amounts of fish and shellfish caught in the Minamata Bay, the Kumamoto Prefecture of Kyushu, Japan (Figure 1). The water system of the Minamata Bay has been polluted by methyl mercuric sulfide (CH3HgSCH3) and methyl mercuric chloride (CH3HgCl) through waste water discharged into the Minamata River by a vinylchloride and acetaldehyde plant (Figure 2).
TL;DR: In this paper, the separation and structures of two new alkaloids, secodaphniphylline (I) and methyl homosecodaphnipphyllate (II), are described.
TL;DR: It is suggested that ouabain inhibits the function of membrane-bound Na, K-adenosine triphosphatase of the chick embryo cells and thus prevents accumulation of K ion in them, which is needed for events of exponential growth of virus to proceed.
Abstract: The effect of ouabain (g-strophanthin), a cardiac glycoside, on the growth of several enveloped viruses was examined. It was found that the growth of HVJ (Sendai virus) in chick embryo cells was markedly inhibited by the drug at a concentration as low as 5 × 10−5m. A virus-inhibitory concentration of ouabain did not cause morphological changes in uninfected cells, nor did it have the capacity to inactivate virus infectivity. Ouabain interfered with the intracellular synthesis of viral macromolecules. Although viral ribonucleic acid and viral antigens were synthesized by the ouabain-treated cells, the rate of synthesis was slower, and the total amounts of these macromolecules were smaller than those in the untreated control cells. It is suggested that ouabain inhibits the function of membrane-bound Na, K-adenosine triphosphatase of the chick embryo cells and thus prevents accumulation of K ion in them. Accumulation of intracellular K ion to a certain level would be needed for events of exponential growth of virus to proceed, and ouabain might inhibit this step by preventing such accumulation of K ion. This view was supported by the finding that the concentration of K ion in the HVJ-infected cells was rapidly reduced by the treatment with ouabain, and that, when the ouabain-treated culture was shifted to a medium containing a higher concentration of K ion than normal medium, virus production started in parallel with the increase of intracellular K ion. The fact that the concentration of K ion in BHK-21 cells, which support virus growth in the presence of ouabain, is not reduced by the treatment with the drug also suggested this possibility.