Showing papers by "National Tsing Hua University published in 1974"
143 citations
57 citations
TL;DR: The results indicate that Arg-30 and Arg-33 are functionally important for the lethal activity and Arg -30 andArg-36 are more closely related to the antigenic specificity of the toxin.
39 citations
TL;DR: In this paper, the surface-state energy levels associated with a semi-infinite linear chain of atoms with two atomic orbitals have been investigated using the Green's-function formalism of Kalstein and Soven.
Abstract: The surface-state energy levels associated with a semi-infinite linear chain of atoms with two atomic orbitals have been investigated using the Green's-function formalism of Kalstein and Soven. We have made a systematic study of the dependence of the energies of both Shockley and Tamm surface states and their existence condition on parameters such as the hopping integral and the surface-potential perturbation.
27 citations
21 citations
TL;DR: In this paper, an analysis of the electronic surface states, both inside and outside, of liquid helium was carried out, and an upper bound of 38 K was established for the potential barrier seen by electron bubbles trapped inside the surface layer.
Abstract: Beginning with a microscopically obtained density profile near the free surface of liquid helium an analysis of the electronic surface states, both inside and outside, is carried out. For the potential barrier seen by electron bubbles trapped inside the surface layer we find an upper bound of 38 K, in comparison with experimental values ranging from 25 to 30 K. For outside states we find a binding energy of 9 K and a hydrogenlike spectrum. There are no adjustable parameters in the theory.
15 citations
11 citations
TL;DR: In this article, the electronic density of states at the interface of two semi-infinite linear chains consisting of atoms with $\mathrm{sp}$ orbitals was investigated using the Green's-function formalism.
Abstract: The electronic density of states at the interface of two semi-infinite linear chains consisting of atoms with $\mathrm{sp}$ orbitals is investigated using the Green's-function formalism. The effect of the interface coupling on the Shockley surface states and the bulklike densities of states is studied in detail.
11 citations
TL;DR: In this article, the spin-lattice relaxation time of conduction electrons in liquid and solid alkali metals has been calculated in terms of the dynamical structure factor which includes a Debye phonon spectrum.
Abstract: A theory of the spin-lattice relaxation timeT
1 of conduction electrons in liquid and solid alkali metals has been calculated here. TheT
1 is expressed in terms of the dynamical structure factor which includes a Debye phonon spectrum. The normal and umklapp processes are calculated separately. We find that the transverse phonons contribute greatly to the unklapp process. We also have measured the temperature dependence ofT
1 in sodium metal from 100°K to 600°K. The experimental data are in fair agreement with our theory from 13°K to 600°K.
9 citations
8 citations
TL;DR: The reduction of 2-pyridine carbaldehyde with the same reagent, however, was found to afford bis(4-dimethylaminophenyl) methane.
Abstract: Benzaldehyde, 2-pyridinecarbaldehyde, furfural, and 2-thiophenecarbaldehyde were reduced to the corresponding primary alcohols in satisfactory yields with thiourea dioxide in ethanolic alkaline solution, but 2-pyrrolecarbaldehyde, in very low yield. The reduction of p-dimethylaminobenzaldehyde with the same reagent, however, was found to afford bis(4-dimethylaminophenyl) methane.
TL;DR: The mechanism of title reaction was fully studied in this paper, where the reaction of indole with propiolic acid methyl ester gave a 2 : 1 adduct (II), and Hydrolysis of adduct II yield the corresponding carboxylic acid (IV).
Abstract: The reaction of indole with propiolic acid ia 1 : 1 mole ratio gave an adduct (I) of 2 : 1 addition with decarboxylation. The reaction of indole with propiolic acid methyl ester gave a 2 : 1 adduct (II). Hydrolysis of adduct II yield the corresponding carboxylic acid (IV). Decarboxylation of IV also gave I. The mechanism of title reaction were fully studied.
TL;DR: Several batches of CaSO4(Dy) phosphor were prepared for the investigation of the thermoluminescent response versus thermal and fast-neutron fluence at low dose level in a mixed neutron-gamma field from PuBe neutron source as discussed by the authors.
TL;DR: In this article, the energy eigenvalue equation for a free-electron gas in the presence of a dc magnetic field was solved using time-independent perturbation theory, and the longitudinal linear and nonlinear conductivity tensors were calculated by using the quantum-mechanical treatment which is valid in the high-frequency region.
Abstract: Using time-independent perturbation theory, the energy eigenvalue equation for a free-electron gas in the presence of a dc magnetic field $\stackrel{\ensuremath{\rightarrow}}{B}$ is solved. The energy-band structure applied here is supposed to be the Cohen nonellipsoidal nonparabolic model. Then the longitudinal linear and nonlinear conductivity tensors are calculated by using the quantum-mechanical treatment which is valid in the high-frequency region. It is found that these conductivity tensors for ultrasound propagating parallel to the dc magnetic field depend upon the magnetic field and sound frequency. Some oscillations and discontinuities in these conductivity tensors are observed. This can be explained by the fact that the linear and nonlinear conductivity tensors have the logarithmic singularities of a purely quantum origin related to the degeneracy of the electron gas. We also present some numerical calculations of the absorption coefficient and change in sound velocity in bismuth. It is found that the absorption coefficient and change in sound velocity oscillate with the dc magnetic field and sound frequency when the ultrasound propagates parallel to the magnetic field.
TL;DR: In this paper, the average width is 160 \ifmmode\pm\else\textpm\fi{} 60 keV, which is consistent with the value 153 keV predicted by Hsu's relationship.
Abstract: 10 intermediate resonances with their spins and parities were identified in this study. The average width is 160 \ifmmode\pm\else\textpm\fi{} 60 keV, which is consistent with the value 153 keV predicted by Hsu's relationship.NUCLEAR REACTION $^{28}\mathrm{Si}(d,p)$, $E=2.0\ensuremath{-}4.2$ MeV; measured $\ensuremath{\delta}(E;\ensuremath{\theta})$; $\ensuremath{\theta}=15\ensuremath{-}165\ifmmode^\circ\else\textdegree\fi{}$, $\ensuremath{\Delta}\ensuremath{\theta}=15\ifmmode^\circ\else\textdegree\fi{}$; channel correlation analysis; discussed intermediate structure.
TL;DR: By introducing the use of initial velocity in the kinetic studies of proteolytic enzymes with protein as the substrate, this study makes clear that the kinetics of the enzymatic proteolysis very well fits the Michaelis-Menten law instead of the Schutz law.
Abstract: A method using ninhydrin reagent for proteolytic activity measurement and kinetic studies with protein or modified protein as substrate was explored As the reagent is specific for amino group, quantitative expression can be made with the number of peptide bonds cleaved The sensitivity of the method made it possible for the determination of various kinetic parameters such as Km, Vmax and Kcat with the measurement of initial velocity As an example, these quantities were determined for pancreas protease with casein and N,N-dimethylcasein as substrates This study made clear the possibility of using a common substrate of proteolytic enzymes for kinetic studies and a general reference for activity expression By introducing the use of initial velocity in the kinetic studies of proteolysis with protein as the substrate, this study also makes clear that the kinetics of the enzymatic proteolysis very well fits the Michaelis-Menten law instead of the Schutz law
TL;DR: In this paper, the Koringa-Kohn-Rostoker (KKR) method was applied to LiHg, a metallic alloy in the ordered β phase, and its cohesive energy was determined by the combination of the quantum defect and the KKR method.
TL;DR: In this paper, an emission spectrographic determination of fifteen rare earth elements in thorium was developed, the procedure was carried out using low current d.c. arc and using Sc as an internal standard.
Abstract: An emission spectrographic determination of fifteen rare earth elements in thorium was developed, the spectrographic procedure was carried out using low current d.c. arc and using Sc as an internal standard. The rare earth impurities were concentrated with cation-exchange resin. Very high sensitivity was achieved with 1 g sample. The detection limits range from 0.01 μg for Yb to 0.5 μg for Pr and Nd.
TL;DR: In this article, a simple method has been worked out for theoretical analysis of the galvanomagnetic tensor elements for metals with ellipsoidal-nonparabolic (ENP) band structure in low magnetic fields.
TL;DR: In this paper, the authors measured the neutron spectrum outside a reactor beam port using a 3 He semiconductor neutron spectrometer and found that only neutrons between 2 and 10 MeV can be obtained.
TL;DR: A tentative mechanism with the migration of positive hole is proposed for the formation of UV-induced new radicals following γ-irradiation in 3-methylpentane glasses at 77°K; and to account for all the experimental observation as mentioned in this paper.
Abstract: Studies on the isotropic hyperfine splitting constants of protiated and deuterated 3-methylpentyl radicals produced by γ-ray accompanied with the radical yield determinations reveal that the radicals are distributed in clusters in the matrix. A tentative mechanism with the migration of positive hole is proposed for the formation of UV-induced new radicals following γ-irradiation in 3-methylpentane glasses at 77°K; and to account for all the experimental observation.
TL;DR: In this paper, the phonon peaks in Ge have been observed and identified using electron tunneling experiments with metal-Ge-metal junctions, and they have been identified using an electron detector.
TL;DR: In this article, it was shown rigorously that spin-1 Ising-like Hamiltonians with biliniar and biquadratic exchange interactions and a Hamiltonian with uniaxial and quadrupolar pair interactions have exactly the same thermodynamic properties.