Showing papers by "Sophia University published in 1989"
TL;DR: In this article, the effect of the sample particle size on the crystal structure and the Curie temperature of BaTiO/sub 3/ powder investigated in the particle size range 0.1 to 1.0 {mu}m was discussed.
Abstract: The authors discuss the effect of the sample particle size on the crystal structure and the Curie temperature of BaTiO/sub 3/ powder investigated in the particle size range 0.1 to 1.0 {mu}m. The transformation from tetragonal to cubic symmetry occurs at a critical particle size of 0.12 {mu}m at room temperature, and the Curie temperature drops below room temperature at the critical particle size.
855 citations
TL;DR: In this paper, the Weinberg-Salam theory was used to calculate the photo-neutrino energy-loss rate in the regime 1-10 to 14th g/cu cm, 10 to 7th -10 to the 11th K.
Abstract: Detailed results of the calculation of the neutrino energy-loss rates due to pair, photo-, plasma, and bremsstrahlung processes corresponding to the density-temperature regime 1-10 to the 14th g/cu cm, 10 to the 7th - 10 to the 11th K are presented. The calculation is based on the Weinberg-Salam theory. The present calculation is the most accurate calculation to date covering the widest density-temperature regime. The discrepancies with the previous works are carefully examined. Extensive tables are prepared to show the detailed results of the photo-neutrino energy-loss rate. 26 refs.
180 citations
TL;DR: In this article, it has been shown that minerals with higher BO 3 BO 4 ratios have higher 11 B 10 B isotopic ratios than those of non-marine origin, which is explainable by the difference in crystal structure among the minerals.
114 citations
TL;DR: High choriolytic (egg envelope digesting) enzyme (HCE) was purified and some biochemical and enzymological properties were examined, and it was suggested that it was a zinc-protease.
Abstract: The hatching enzyme is an embryo-secreted enzyme(s) which digests the egg envelope, allowing the embryo to emerge at the time of hatching. The hatching enzyme of the fish, Oryzias latipes, has recently been found to consist of two kinds of proteases which may digest the inner layer of chorion (egg envelope) cooperatively [Yasumasu, S. et al. (1988) Zool. Sci. 5, 191-195]. In the present study, one of them, high choriolytic (egg envelope digesting) enzyme (HCE) was purified and some biochemical and enzymological properties were examined. The enzyme was a basic protein with a molecular weight of about 24 kDa, and exhibited choriolytic activity as well as proteolytic (caseinolytic) activity. The results of inhibitor studies and metal analyses strongly suggested that it was a zinc-protease. The purified HCE consisted of two probable isomers, HCE-1 and HCE-2. Both of them were markedly similar in amino acid composition, specific activities of choriolysis and proteolysis, and substrate specificity as determined using MCA-peptides. Moreover, they were not separable on SDS-PAGE, electrofocusing PAGE, or ultracentrifugal analysis, but were discriminated only on HPLC with a CM-300 column. Thus, the mixture of HCE-1 and HCE-2 could be regarded as almost a single enzyme, HCE. When it acted on an intact chorion, the purified HCE caused a remarkable swelling of its inner layer with concomitant release of peptides from it. Once the inner layer of chorion was swollen, the enzyme hardly digested it.
106 citations
TL;DR: The result strongly suggests that the SF substance from the liver is a precursor substance of the major component, ZI-3, of the inner layer of egg envelope in the fish.
103 citations
TL;DR: In this paper, the adsorption properties of molybdena species onto titania surfaces and the surface properties of the catalysts have been studied by using an equilibrium adaption method.
85 citations
02 Feb 1989-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, a stable glow plasma at atmospheric pressure under selected conditions was used for surface fluorination of PET (polyethylene terephthalate) film, carbon thin film deposition and polymerization of ethylene by such a plasma.
Abstract: A plasma treatment at atmospheric pressure was developed employing a stable glow plasma at atmospheric pressure under selected conditions. The structure of the electrode, the kind of dilute gas, and the frequency of power were controlled. The surface fluorination of PET (polyethylene terephthalate) film, carbon thin film deposition and polymerization of ethylene by such a plasma are described here. The surface energy could be controlled by plasma treatment at various concentrations (O 2 /CF 2 /He). The ageing effect has been observed for 9 months by measuring the contact angle of a water drop on the surface and surface composition by XPS. The friction coefficients were measured at the fluorinated surface.
82 citations
TL;DR: The present results demonstrated an essential role of LCE in choriolysis, in cooperation with HCE, and very efficiently digested the inner layer of chorion that had been swollen previously by the action of HCE.
Abstract: One of the two component proteases of the hatching enzyme of the fish, Oryzias latipes, low choriolytic enzyme (LCE), was isolated from the hatching liquid and partly characterized. The enzyme was a basic protein with molecular weight of about 25.5 kDa. Like high choriolytic enzyme (HCE), the other component of the O. latipes hatching enzyme [Yasumasu, S. et al. (1989) J. Biochem. 105, 204-211], LCE was considered to be a zinc-protease from the results of inhibitor studies and metal analyses. However, LCE was found to be distinct from HCE not only in some biochemical characteristics such as molecular weight, amino acid composition, and isoelectric point, but also in some enzymological properties such as substrate specificity, heat stability, and mode of action toward their natural substrate, chorion (egg envelope). Although LCE was almost incapable of digesting the inner layer of intact chorion, it very efficiently digested the inner layer of chorion that had been swollen previously by the action of HCE. Taking account of the fact that HCE swells the inner layer of intact chorion by partial proteolysis but does not efficiently digest the swollen chorion any more [Yasumasu, S. et al. (1989) J. Biochem. 105, 204-211], the present results demonstrated an essential role of LCE in choriolysis, in cooperation with HCE.
81 citations
TL;DR: In this article, a-and b-type spectra are assigned and fitted to an asymmetrical-top Hamiltonian, giving A = 25 468.821 MHz, B = 2084.42 MHz, C = 1928.46 MHz, ΔJK = 371.7 kHz, ΔK = 474(10) kHz, δJ = 1.61 kHz, and hK = 10.1 kHz.
72 citations
TL;DR: In this paper, the authors have explored self-exchange-based electron transport in a variety of mixed-valent polymeric media, where the transport rate is measured as the electron diffusion coefficient, De, or the self exchange rate constant kex.
Abstract: Using microelectrochemical techniques, our laboratory has explored self-exchange-based electron transport in a variety of mixed-valent polymeric media. The transport rate is measured as the electron diffusion coefficient, De, or the self-exchange rate constant kex. The basic variables for electron transport in mixed-valent polymer materials include: (a) the physical mobility of the counterions of the polymer that migrate due to electroneutrality requirements, (b) the physical diffusion coefficient, Dphys, of the monomeric or polymeric oxidized and reduced molecular sites or ions relative to the rate of electron hopping or tunnelling between donor/acceptor pairs, (c) the observational timescale relative to these mobilities which provides the distinction between transient and steady-state experiments, and (d) the chemical environment of the polymer, whether dry and solvent-free or contacted by solvent vapour or liquid. Experimental strategies and results are presented for the measurement of rates of ion diffusion, Di, in N2-dry and solvent-wetted mixed valent polymers. In a dry, mixed-valent osmium complex polymer, the electron-transport rate measured under steady-state conditions, where no ion transport occurs concurrently, is much faster than the diffusion rate of the ion as estimated in a transient electrolysis experiment. In a solvent-wetted osmium complex polymer, the electron-transport rate measured under transient conditions is much slower than that of the ion which was measured under steady-state conditions. These circumstances allow isolation of individual processes and are interpreted as giving electron-transport rates not strongly influenced by macroscopic ion-transport rates. Cyclic voltammetry of [Co(bpy)3]2+ and of Li+TCNQ– in dry poly(ethylene oxide) polymer electrolyte solvents exhibits differing measured diffusion coefficients, Dapp, for the oxidation vs. the reduction of each compound, reflecting the coupling of physical diffusion and electron self-exchange transport. Microdisc electrode voltammetry of solutions of a synthesized ferrocene mono-tagged poly(ethylene oxide) in a polymer solvent of comparable molecular weight gives Dapp values smaller than those for ferrocene monomer dissolved in the same polymer solvent. The Dapp in the former case measures the self-diffusion rate of a linear chain polymer within a linear chain polymer solvent. Measurability of this rate has implications for assumptions about diffusive mobility of redox molecules attached to polymer chains.
71 citations
TL;DR: The behavior of p-bpa-monosaccharide complexes in vivo after injection of the complex solution is described, and the complex formation constants obtained by the UV method in pH 7.4 solution are described.
Abstract: To increase the solubility of p-boronophenylalanine (p-bpa) in neutral pH solution, the complex formation of p-bpa with some monosaccharides has been studied by 11B-NMR and UV spectroscopy. The complex formation constants (log K) obtained by the UV method in pH 7.4 solution are 2.43 (fructose), 2.19 (mannitol), 1.28 (galactose), 1.10 (mannose), and 0.85 (glucose), respectively. One hundred milligrams of p-bpa is able to dissolve in 3 ml of 0.3 M fructose solution at pH 7.98. Based on the results obtained, the behavior of p-bpa-monosaccharide complexes in vivo after injection of the complex solution is described.
TL;DR: It is proposed that segments A-D of the M2 and phi 29 DNA polymerases constitute a structure which forms the cleft for holding template DNA and that segment D is a region for interacting with dNTP.
TL;DR: In this paper, three new types of ceramic actuators have been developed: digital displacement transducers or shape-memory ceramics, monomorph actuators, and photostrictive devices.
Abstract: Electromechanical solid state devices are currently being actively investigated. Very recently, three new types of ceramic actuators have been under development: 1) digital displacement transducers or shape-memory ceramics, 2) monomorph actuators, and 3) photostrictive devices. These devices are reviewed with particular emphasis on the initial processes of the discovery.
TL;DR: In this article, the effect of impurity doping on the electrostrictive properties (the magnitude of the induced strain and hysteresis) has been investigated for (Pb,Ba) (Zr,Ti)O3 ceramics.
Abstract: The effect of impurity doping on the electrostrictive properties (the magnitude of the induced strain and hysteresis) has been investigated for (Pb,Ba) (Zr,Ti)O3 ceramics. When doping with a donor impurity, the strain becomes larger and the degree of hysteresis becomes smaller than that observed for non-doped samples, while acceptor doping leads to a smaller strain and a larger degree of hysteresis. The strain and hysteresis are also influenced by the concentration of the metal oxide dopant.
TL;DR: In this article, two sulfur atoms of the different dithiolato ligands are added to one of the double bonds of NBD and the reactions of 1 with quadricyclane (Q) are 103-104 times faster than those with NBD.
TL;DR: There is strong evidence that endothelin is one etiological factor in the development of hypoglycemic/ischemic brain injury, as a result of interaction with specific receptors which activate the voltage-sensitive Ca2+ channel.
TL;DR: In this article, drive voltage dependence of electromechanical resonance has been investigated in PLZT piezoelectric ceramics, and the changes in the parameters can be computer-simulated theoretically by introducing nonlinear capacitive and resisitive terms into an electrical equivalent circuit.
Abstract: Drive voltage dependence of electromechanical resonance has been investigated in PLZT piezoelectric ceramics. With increasing the ac drive voltage, some electromechanical parameters change remarkably: the resonance frequency fm decreases, the anti-resonance frequency fn does not shift, the mechanical quality factor Qm decreases drastically, and the electromechanical coupling factor kr increases. On the contrary, these parameters do not change significantly with changing the dc bias voltage, keeping the ac voltage amplitude. The changes in the parameters can be computer-simulated theoretically by introducing non-linear capacitive and resisitive terms into an electrical equivalent circuit.
TL;DR: In this article, the allylation of benzaldehyde by (E)-but-2-en-1-ol using catalyst PdCl2(PhCN)2 and SnCl2 was achieved by the choice of polar solvents.
TL;DR: In this article, the epithermal NAA was used for rare earth element (REE) determination in acidic hot spring and crater lake waters by neutron activation analysis (NAA).
Abstract: Determination of the rare earth elements (REE's) in acidic hot spring and crater lake waters by neutron activation analysis (NAA), in which activation was performed mostly by epithermal neutrons (epithermal NAA) was investigated. Nine REE's, La, Ce, Sm, Eu, Tb, Ho, Tm, Yb and Lu, out of fourteen naturally existing REE's were determined at ppb levels with satisfactory precision. The epithermal NAA was found to be more effective in the determination of Sm, Tb, Ho and Yb than normal NAA, in which activation was performed mainly by thermal neutrons. Combined use of the epithermal and normal NAA's enabled the determination of eleven REE's, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Lu.
TL;DR: It is proposed that the endogenous kinase is the catalytic subunit of the cAMP-dependent protein kinase, and the sequence around the phosphorylation site probably is close to the C-terminus of the paramyosin molecule.
Abstract: 1. 1. Myofibrils isolated from Mercenaria mercenaria were phophorylated by endogenous kinase. Over a range of ionic strengths only paramyosin was phosphorylated. 2. 2. Thiophosphorylation of paramyosin caused an inhibition of steady-state actin-activated ATPase activity of the myofibrils. 3. 3. It is proposed that the endogenous kinase is the catalytic subunit of the cAMP-dependent protein kinase. 4. 4. The sequence around the phosphorylation site was determined. 5. 5. The phosphorylation site probably is close to the C-terminus of the paramyosin molecule.
TL;DR: High choriolytic enzyme (HCE), a constituent protease of the hatching enzyme of the teleost, Oryzias latipes, swells its natural substrate, egg envelope (chorion) by hydrolyzing it partially and the binding between the enzyme and the chorion seems to be stoichiometric.
TL;DR: To investigate the cellular basis for the scale arrangement pattern, cell arrangement in the epidermal monolayer of the pupal wing of a small white cabbage butterfly is examined by scanning electron microscopy and light microscopy.
Abstract: In most species of lepidopteran insects, anteroposterior rows formed by scales are arranged at regular intervals in the adult wing; within each row two kinds of scales are alternately arranged. To investigate the cellular basis for the scale arrangement pattern, we examined cell arrangement in the epidermal monolayer of the pupal wing of a small white cabbage butterfly, Pieris rapae, by scanning electron microscopy and light microscopy.
The arrangement of scale precursor cells, closely resembling that of scales in the adult wing, was observed in the wing epidermis of the early pupa. Scale precursor cells are proximodistally elongated and form anteroposterior rows. Within a row two kinds of scale precursor cells are nearly alternately arranged, which is not so precise as the alternation of scales in the adult wing. Individual rows of scale precursor cells are separated by rows of single or double undifferentiated general epidermal cells. Occasionally, arrangement abnormalities occur both in the adult and the pupal wing. The cellular basis for the regular spacing of scale rows is discussed.
TL;DR: In this article, the synthesis and X-ray diffraction study of the title copper(II) complex have been carried out, and the results showed that the copper atom is in a trigonal-bipyramidal geometry, ligated by a nitrogen atom, a carboxylato oxygen atom, two hydroxyl oxygen atoms and a Carboxylate oxygen atom of the neighboring unit.
TL;DR: In this paper, a coprecipitation process in which aluminium was used as a collector was used to enhance the concentrations of rare earth elements and reduce the amounts of interfering nuclides before neutron irradiation.
Abstract: Hot spring water and crater lake water samples were analyzed for their rare earth elements: (REE's) by neutron activation method, which, in the irradiation, sample preparation, incorporated a coprecipitation process in which aluminium was used as a collector. Ten REE's, La, Ce, Sm, Eu, Gd, Tb, Dy, Tm, Yb and Lu, were consequently detected and determined at the ppb level with satisfactory precision. It was shown that the aluminium coprecipitation is effective in enhancing concentrations of the REE's and reducing the amounts of interfering nuclides before neutron irradiation.
TL;DR: In this article, a fine-grained barium titanate powder with a particle size of 0.1μm was sintered by the HIP (Hot Isostatic Pressing) method using a platinum capsule.
Abstract: Pure fine-grained barium titanate powder with a particle size of 0.1μm was sintered by the HIP (Hot Isostatic Pressing) method using a platinum capsule. HIP is an effective process for sintering barium titanate for reducing the sintering temperature and grain size. The densification proceeded at the HIP temperature 800°C under the pressure of 500MPa. The HIP sintered fine-grained barium titanate exhibited a lower dielectric constant and broader temperature characteristics at the Curie point (Tc) than that for a normal-sintered sample. A close relationship was obtained between the dielectric constant and the HIP treatment temperature. With lowering the HIP treatment temperature or time, both the dielectric constant and the peak temperature of the dielectric constant decreased. The grain size of the samples ranged under 1μm, much smaller than that of the normal-sintered samples.
TL;DR: In this article, a detailed study of the weak interaction form factors and the magnetic moments of the octet baryons is presented, where the volume-type cloudy bag model is used as a possible framework for incorporating mesonic contributions in a systematic manner.
TL;DR: In this paper, a variety of advantages using 13 C as a target for solar neutrino detection in scintillation counters are discussed. But none of these advantages can be used to detect neutrinos in a massive CH 2 -scintillator.
TL;DR: The results suggest that F-actin negatively affects the gel formation of fish muscle proteins in the thermal gelation of muscle proteins.
Abstract: Although a relatively large amount of actin is contained in myofibril, the role of F-actin in the thermal gelation of muscle proteins has been little studied. We investigated the dynamic viscoelastic behavior of F-actin on heating to clarify the role of F-actin in the thermal gelation. F-actin did not form an elastic gel on heating but did turn into a curdy matter. In addition, F-actin showed no development either of the storage modulus or the loss modulus during a rise in temperature. These results suggest that F-actin negatively affects the gel formation of fish muscle proteins.