Showing papers by "Nankai University published in 1987"
TL;DR: A method which improves carbon fiber microelectrode selectivity for cationic amines by electrocoating the fiber with a thin film of the ionic polymer, Nafion, is described.
135 citations
TL;DR: The results suggest that Al(3+) altered the architecture of membrane lipids and decreased the membrane's partiality for lipid permeators and decreased membrane permeability to water.
Abstract: This study was undertaken to quantify the effect of aluminum and calcium on membrane permeability. The influence of Ca 2+ (0.2-3.7 millimolar) and Al 3+ (0-3.7 millimolar) on the permeability of root cortical cells of Quercus rubra was measured using three nonelectrolytes (urea, methyl urea, and ethyl urea) as permeators of progressively increasing lipid solubility. Water permeability was also measured. Al 3+ (a) increased membrane permeability to the nonelectrolytes, (b) decreased the membrane9s partiality for lipid permeators, and (c) decreased membrane permeability to water. Ca 2+ had effects on permeability that were opposite to those of Al 3+ . When Al 3+ and Ca 2+ were tested in combination, these opposite effects counteracted each other. The results suggest that Al 3+ altered the architecture of membrane lipids.
133 citations
115 citations
TL;DR: In this article, the Raman spectra of ordinary and extraordinary phonons in LiNbO3 and LiTaO3 are recorded under a set of angles between wave vector and optic axis with the same backward scattering geometry.
Abstract: Raman spectra of ordinary and extraordinary phonons in LiNbO3 and LiTaO3 are recorded under a set of angles between wave vector and optic axis with the same backward scattering geometry, which makes all of the extraordinary phonons to appear in one directional-dispersion spectra series, and the directional dispersion is reliably determined. The symmetry and the number of polar phonons in both the crystals are found to be the same, 4A1T + 4A1L + 9ET + 9EL. The directional dispersion of extraordinary phonons has thirteen branches with similar coupling in LiNbO3 and LiTaO3.
[Russian Text Ignored].
62 citations
45 citations
Patent•
10 Jul 1987TL;DR: In this paper, an oscillating lever is used to make the sealing element move up and down to eliminate the clearance between the door edge and the floor, and the lever is supported by a sealing element that rotates to make it move up or down.
Abstract: Sealing device for a door, which comprises a sealing element provided on the lower edge of the door and being in the upper position when the door is opened and moving down when the door is shut to eliminate the clearance between the door edge and the floor. The sealing element is supported by an oscillating lever, which rotates to make the sealing element move up and down.
30 citations
TL;DR: In this paper, mixed crystals of indole and naphthalene gave an addition product, 1-(1,4-dihydro-1-naphthyl)indole, while irradiation in solution gave another product in addition to 1.
10 citations
TL;DR: In this paper, nonlinear photoinduced light scattering at 414 nm in LiNbO3:Fe caused by degenerate stimulated parametric scattering and its competition process with the photorefractive noise phase gratings have been observed.
Abstract: Nonlinear photoinduced light scattering at 414 nm in LiNbO3:Fe caused by degenerate stimulated parametric scattering and its competition process with the photorefractive noise phase gratings have been observed. The phase-matching scattered light was located in a plane normal to the polar axis of crystal.
8 citations
TL;DR: The high performance liquid chromatographic behavior of 56 bis-and mono-(substituted cyclopentadienyl)titanium dichlorides was investigated in this paper.
7 citations
TL;DR: In this article, the crystal and molecular structures of [η-C5H5Fe(CO)2]2(p-CH3C6H4)SnBr have been solved using the Patterson method.
7 citations
TL;DR: A method by use of cross-section differences to extract higher-twist contributions from large-P/sub T/ ..pi.. photoproduction processes and can be carried out under currently available laboratory conditions.
Abstract: We propose a method by use of cross-section differences to extract higher-twist contributions from large-P/sub T/ ..pi.. photoproduction processes. The calculation shows that this method can obtain clear higher-twist signature and can be carried out under currently available laboratory conditions.
TL;DR: In this article, a unified quarkonium potential was proposed, which combines the asymptotic freedom at the large-Q 2 and the multi-gluon effect at the lower Q 2 regions with the confinement at large distance.
TL;DR: Results suggest that the binding site of EBB on the activated Ca2+ + Mg2+-ATPase may bear structural similarity to that on calmodulin, and may be closely related to the ATP-binding site on the enzyme.
Abstract: Ca2+-stimulated Mg2+-dependent ATPase (Ca2+ + Mg2+-ATPase) stimulated by calmodulin, by partial proteolysis or by oleic acid in erythrocyte membranes was inhibited by various derivatives of the naturally occurring alkaloid berbamine. The ability of these derivatives to inhibit trypsin-activated Ca2+ + Mg2+-ATPase correlated well with their ability to inhibit the calmodulin-stimulated enzyme. Inhibition of the trypsin-activated Ca2+ + Mg2+-ATPase by O-4-(ethoxybutyl)berbamine (EBB) was competitive with respect to ATP. The Ki for inhibition was about 8 microM. These results suggest that the binding site of EBB on the activated Ca2+ + Mg2+-ATPase may bear structural similarity to that on calmodulin, and may be closely related to the ATP-binding site on the enzyme.
TL;DR: In this paper, the temperature jump technique has been used to determine the rate constants for the formation and dissociation of the mixed complex compounds Cu(Il)2,2′-bipyridyl-α-aminoacids and Cu(II) 1,10-phenanthroline-aminosacids at 25°C and I = 0.10 mol dm−3 NaClO4.
01 Jan 1987
TL;DR: Three copolymers were made from the suspension polymerization of methyl acrylate, divinyl benzene and triallyl isocyanurate and acrylamide and N,N'-methylene-bis-acrylamides and converted into derivatives of hydrazides which indicates the sorbents might be used in artificial kidney system because they sorbed the urea from hemodialysate as much as that of the pure urea in a buffer solution.
Abstract: Three copolymers were made from the suspension polymerization of methyl acrylate, divinyl benzene and triallyl isocyanurate; acrylamide and N,N'-methylene-bis-acrylamide; and styrene and divinyl benzene. These copolymers were then converted into derivatives of hydrazides through several steps. They were used as polymeric sorbents. They sorbed in situ a little bit less than 40 mg. of urea per gram of sorbent at 37 degrees C, pH = 7.0-7.4 and the percentage of urea in the buffer solution being 130 mg%. The sorption of urea was related to the specific surface area of the sorbent, temperature of sorption and time of sorption, concentration of urea, pH value of solution etc. In order to find out whether the above-prepared derivatives of hydrazide can be used clinically as polymeric sorbents in artificial kidney system, the junior author carried out experiments with patient's dialysate as imitated to hemodialysis. From the results, it indicates the sorbents might be used in artificial kidney system because they sorbed the urea from hemodialysate as much as that of the pure urea in a buffer solution.
TL;DR: Relation entre les constantes de stabilite des complexes and l'acidite et la basicite des coordinats and relation entre the constantes of stabilite and the constante de Hammett is discussed in this article.
TL;DR: In this article, the rate constants for complex formation between positronium and glycine derivatives in solution were obtained by means of a positron annihilation lifetime spectrometer with BaF 2 detectors, which mainly depend on the conjugation effect at the benzene ring and the induction effect of the substituents at phenyl.
TL;DR: In this article, the authors give sufficient conditions for the existence of solution of the nonlinear two-point boundary value problem (1.1) and employ these results to consider the boundary layer phenomena of the quasilinear weakly coupled singularly perturbed system (DP)q.
Abstract: In this paper, the objective is to give sufficient conditions for the existence of solution of the nonlinear two-point boundary value problem(1.1). And we employ these results to consider the boundary layer phenomena of the quasilinear weakly coupled singularly perturbed system (DP)q.
TL;DR: An edit-partition procedure for a tree classifier design is described, in which a nearest neighbor editing is applied to the training sample before space partition, which leads to a high recognition rate, asymptotic optimality, high speed and much flexibility.
01 Jan 1987
TL;DR: Improved understanding of protein as well as peptide interactions brings with it the ability increasingly to use these phenomena in technology, for example, as vehicles for separation, enzyme regulation, immunodiagnostics and therapy, the redesign of native macromolecules to produce new functions and the de novo design of non-biological surrogates.
Abstract: Macromolecular recognition is a unifying theme in biology and biotechnology and understanding the mechanisms underlying this phenomenon remain important goals of biochemical study The structural nature of recognition surfaces for an increasing array of macromolecules, especially proteins, can now be described at high resolution thanks largely to diffraction analysis of their crystals Such protein structures offer an improved opportunity to focus solution biochemical experiments in order to define the forces responsible for their surface interactions and consequent functions Moreover, improved understanding of protein as well as peptide interactions brings with it the ability increasingly to use these phenomena in technology, for example, as vehicles for separation, enzyme regulation, immunodiagnostics and therapy, the redesign of native macromolecules to produce new functions and the de novo design of non-biological surrogates
TL;DR: Using the atomic transition theory, this article obtained a mathematical expression for the Doppler-free laser OA signal and two conclusions deduced from this expression are consistent with experimental results presented in other relevant papers.
TL;DR: The invariants, canonical forms, and the minimal realizations of singular linear multivariable systems are investigated and two new algorithms of the minimal realization are given by means of the invariants and canonical forms.
TL;DR: A series of iron-sulfur cluster complexes have been synthesized by reductive cleavage of an S-S bond of μ-S2Fe2(CO)6 with Grignard reagents, followed by nucleophilic substitution of the intermediates toward ClCH2C(O)OEt as mentioned in this paper.
Abstract: A series of iron-sulfur cluster complexes (μ-RS) (μ-EtOC(O)CH2S)Fe2(CO)6 (A) have been synthesized by reductive cleavage of an S-S bond of μ-S2Fe2(CO)6 with Grignard reagents, followed by nucleophilic substitution of the intermediates, (μ-RS) (μ-XMgS)Fe2(CO)6 (B) toward ClCH2C(O)OEt. The complexes (A) may be also synthesized by CF3COOH-acidolysis of (B), followed by condensation of (μ-RS) (μ-HS)Fe2(CO)6 (C) with ClCH2C(O)OEt in the presence of Et3N. For the former method, the manipulations are more convenient and the starting materials are more easily available and much cheaper. Through conformational analysis, it has been shown that each of the complexes is a mixture of either three conformers of ae, ee and ea or two conformers in a given ratio.
01 Jan 1987
TL;DR: Various types of macroporous resin beads were screened for the adsorption of middle molecules in vitro and Hemoperfusion with acute renal failure rat model showed good clearance with X-5 resin for middle molecules.
Abstract: Various types of macroporous resin beads were screened for the adsorption of middle molecules in vitro. In order to obtain high adsorption capacity, the pore size of the resin should be large enough to allow diffusion of the middle molecules. The adsorption capacity of X-5 resin for Vitamin B12, inulin and cytochrome C was 35.3 mg/g, 1.2 mg/g and 42.9 mg/g respectively in vitro tests. Hemoperfusion with acute renal failure rat model showed good clearance (0.35 +/- 0.25) with X-5 resin for middle molecules.
TL;DR: The results indicate that plant cells with intact cell walls can be directly transformed by A. tumefaciens, and had the ability to grow in the absence of plant hormones and very easily regenerated into plants, although nopaline was not detected in the tissues and plants from transformed cells.
Abstract: In vitro transformation of suspension cultured single cells of carrot by Agrobacterium tumefaciens strain C58 was reported here. The results indicate that plant cells with intact cell walls can be directly transformed by A. tumefaciens. At 25℃,and at a ratio of 100 bacteria per plant cell, the transformation frequency was about 10 -4 .The transformed cells had the ability to grow in the absence of plant hormones and very easily regenerated into plants, although nopaline was not detected in the tissues and plants from transformed cells.The differences in the growth rate and regeneration ability between tumors induced by A.tumefaciens strain C58 and hairy roots induced by A. rhizogenes strain A4 on carrot disks were compared.
01 Jan 1987
TL;DR: In this paper, a series of iron-sulfur cluster complexes (μ-RS) were synthesized by reductive cleavage of an S-S bond of μ-S_2Fe_2(CO)_6 with Grignard reagents, followed by nucleophilic substitution of the intermediates, i.e.
Abstract: A series of iron-sulfur cluster complexes (μ-RS) (μ-EtOC(O)CH_2S)Fe_2(CO)_6(A) have been synthesized by reductive cleavage of an S--S bond of μ-S_2Fe_2(CO)_6 with Grignard reagents, followed by nucleophilic substitution of the intermediates, (μ-RS) (μ-XMgS)Fe_2(CO)_6(B) toward ClCH_2C(O)OEt. The complexes (A) may be also synthesized by CF_3COOH-aidolysis of (B), fol- lowed by condensation of (μ-RS) (μ-HS)Fe_2(CO)_6(C) with CICH_2C(O)OEt in the presence of Et_3N. For the former method, the manipulations are more convenient and the starting materials are m(?)(?)(?) easily available and much cheaper. Through conformational analysis, it has been shown that each of the complexes is a mixture of either three conformers of ae, ee and ea or two conformers in a given ratio.
TL;DR: The conformers of these complexes and the ratios of the conformers have been discussed ac-cording to the chemical shifts and integrated values of methyl, methylene and methyne groups attachedto the sulfur atoms in the complexes as mentioned in this paper.
Abstract: Twenty new Fe-S cluster complexes having a general formula (μ-RS) (μ-R'S)-Fe_2(CO)_6 were synthe-sized through reduction of -S_2Fe_2(CO)_6 with RMgC1, followed by in situ nucleophilic substitution of RXwith the intermediates (μ-RS)(μ-C1MgS)Fe_2(CO)_6. Besides the data of m.p., C/H, IR and ~1H NMRdetermined, the conformers of these complexes and the ratios of the conformers have been discussed ac-cording to the chemical shifts and integrated values of methyl, methylene and methyne groups attachedto the sulfur atoms in the complexes.
TL;DR: RP(S)2 reacting with R'NH2 gave the corresponding substituted thioureas and new compounds with the general formular, this article, which is the same as the one we use here.
Abstract: RP(S)(NCS)2 reacting with R'NH2 gave the corresponding substituted thioureas and new compounds with the general formular,
TL;DR: It would be worthwhile to test whether the alpha transfer mechanism can also explain the nonstatistical intermediate structure of the excitation function often found in 4N nuclei scattering.
Abstract: A molecular orbital theory for the 3\ensuremath{\alpha} transfer process has been formulated and applied to the $^{16}$O${+\mathrm{}}^{28}$Si scattering case. The \ensuremath{\alpha} transfer mechanism has already been applied successfully in the interpretation of the anomalous large angle scattering between 4N nuclei. It would be worthwhile to test whether the alpha transfer mechanism can also explain the nonstatistical intermediate structure of the excitation function often found in 4N nuclei scattering. The excitation function at 180\ifmmode^\circ\else\textdegree\fi{} is known to be much more sensitive to the details of the optical potential than are the fits to the angular distribution. Both the experimental data of the excitation function at 180\ifmmode^\circ\else\textdegree\fi{} in the energy region from 14 to 52 MeV and all thirteen differential cross sections in the energy region 18.67\char21{}34.80 MeV can be fitted well simultaneously with a common set of parameters.
TL;DR: After healing of the infection, the defected elbow was successfully bridged by the two times of iliac bone grafting, and the patient is satisfied in his daily activities 2 years after the injury.
Abstract: A case of severe open fracture of the right elbow in a 21-years-old male patient caused by car accident was reported.The distal humerus and the olecranon were splintered and the elbow was dislocated with a large wound on its dorsal side. Initially, the elbow was immobilized with an external fixateur, being resulted in severe deep infection which was cured by two times of sequestrotomy and skin grafting with the large bony defect and adhesive scar tissues.After healing of the infection, the defected elbow was successfully bridged by the two times of iliac bone grafting, and the patient is satisfied in his daily activities 2 years after the injury.