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81.
Kazuhiko Tsukagoshi Miwa Otsuka Yukihiro Shikataand Riichiro Nakajima 《Journal of chromatography. A》2001,930(1-2):165-169
Peak areas, peak heights, and apparent theoretical plate numbers were examined as a function of sample injection times by use of the batch-type CL detection cell. Comparing the experimental data with those obtained by absorption detector, some considerations were carried out about the peak shape. The peak shape in CL detection was influenced by not only concentration distribution of sample in a sample zone but also sample diffusion and CL reaction at the capillary outlet. The sample injection time of ca. 35 s was recommended for the present CE with CL detector. The injection time much influenced peak shape as well as sensitivity in the CL detection cell. 相似文献
82.
Choji Kashima Yoshihiro Tsukamoto Yohei Miwa Kohei Higashide 《Journal of heterocyclic chemistry》2001,38(3):601-606
The enantioselective reduction of ketones was accomplished by borane in the presence of pyrazole derivatives, particularly 2‐methoxymethyl‐3‐phenyl‐1‐menthopyrazole (8). The catalysis of zinc chloride makes it possible to lower the reaction temperature below 0 °C, and to promote enantioselectivity. 相似文献
83.
Justin Z. Tam Talulla Palumbo Julie M. Miwa Brian Y. Chen 《Molecules (Basel, Switzerland)》2022,27(19)
Protein-protein interactions often involve a complex system of intermolecular interactions between residues and atoms at the binding site. A comprehensive exploration of these interactions can help reveal key residues involved in protein-protein recognition that are not obvious using other protein analysis techniques. This paper presents and extends DiffBond, a novel method for identifying and classifying intermolecular bonds while applying standard definitions of bonds in chemical literature to explain protein interactions. DiffBond predicted intermolecular bonds from four protein complexes: Barnase-Barstar, Rap1a-raf, SMAD2-SMAD4, and a subset of complexes formed from three-finger toxins and nAChRs. Based on validation through manual literature search and through comparison of two protein complexes from the SKEMPI dataset, DiffBond was able to identify intermolecular ionic bonds and hydrogen bonds with high precision and recall, and identify salt bridges with high precision. DiffBond predictions on bond existence were also strongly correlated with observations of Gibbs free energy change and electrostatic complementarity in mutational experiments. DiffBond can be a powerful tool for predicting and characterizing influential residues in protein-protein interactions, and its predictions can support research in mutational experiments and drug design. 相似文献
84.
Prof. Dr. Shoichi Kutsumizu Akane Kawafuchi Prof. Dr. Yasuhisa Yamamura Dr. Taro Udagawa Takashi Otaki Masaki Masuda Prof. Dr. Yohei Miwa Prof. Dr. Kazuya Saito 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(40):10293-10302
A recent intriguing finding that a helical network arrangement forms the bicontinuous cubic phase is attracting great attention for the possibility of new routes to asymmetric synthesis by achiral molecules. However, the design of the molecular structure for the cubic phase is still unrevealed. In this work, a nonsymmetric core molecule with larger naphthalene and smaller benzene moieties at each side of the central linkage and the same disiloxanyldecyloxy terminal at both terminals is shown to be the first example of molecule forming both single-layered and double-layered core assembly modes in the Ia3d phase as a single molecule system. The molecule forms the former mode at high temperatures as a thermodynamically stable phase, similarly to the symmetric naphthalene core system, whereas, on cooling below a temperature (∼350 K), a metastable Ia3d phase forms a double-layered core state down to room temperature, which is common to the benzene core system. As another effect of the nonsymmetric core, the cubic phase is maintained at room temperature for more than 100 days with slight distortion. Infrared spectral studies and quantum chemical calculations suggested the easy transformation between the two core assembly modes. The core nonsymmetry can be a versatile fine-tuning of the core assembly mode and phase stability for the cubic phase molecules. 相似文献
85.
Fusion of the eight vertex SOS model 总被引:4,自引:0,他引:4
Etsuro Date Michio Jimbo Tetsuji Miwa Masato Okado 《Letters in Mathematical Physics》1986,12(3):209-215
A higher spin analogue is presented of the eight vertex-SOS correspondence in the sense of Andrews-Baxter-Forrester. The resulting hierarchy of solvable models contain the hard hexagon model and its recent multi-state generalizations. 相似文献
86.
87.
For some site-vacant species of Keggin and Dawson polyanions α-[PW12O40]3? and α-[P2W18O62]6? containing hypothetic 相似文献
88.
The structural stability indexes of some previously unreported heteropoly- and isopoly-compounds are discussed. Compounds studied here are mono-substituted Keggin and Dawson heteropolyanions with the general formulas [XZ(H2O)M11O39]n? and [X2Z(H2O)M17O61]n? (X is a heteroatom; Z is a substituted metal ion; M is Mo, or W), two Finke-type heteropolyanions with the formulas [P2W18Z4(H2O)2O68]10? and [P4W30Z4(H2O)2O112]16? (Z = Co(II), Cu(II), Zn(II)), heteropolyvanadates containing high valence heteroatoms [XV13O38]7? (X = Mn(IV), Ni(IV)), isopolyvanadate [V10O28]6?, some heteropolyvanadates with capped-Keggin structures, and [As4W40O140]28? as an inorganic cryptate. An additional rule concerning the conversion between the heteropoly- and isopoly-anions is proposed as the fourth rule. The actual stability of heteropolyanions with the small structural index is interpreted by the presence of a significant contribution from the heteroatom or other supporting metal ions. 相似文献
89.
Taking the XXZ chain as the main example, we give a review of an algebraic representation of correlation functions in integrable
spin chains obtained recently. We rewrite the previous formulas in a form which works equally well for the physically interesting
homogeneous chains. We discuss also the case of quantum group invariant operators and generalization to the XYZ chain.
Communicated by Vincent Rivasseau
Dedicated to the memory of Daniel Arnaudon
Submitted: January 18, 2006; Accepted: February 28, 2006 相似文献
90.
The microgravimetric and voltammetric responses of a polycrystalline Pt electrode in 0.1 mol L−1 NaOH solution in the presence and the absence of 1.6 × 10−4 Zn2+, at 0.1 V s−1 were analyzed. During the positive potential sweep, the water molecules are progressively substituted by OH− ions, prior to PtO formation. The voltammetric charges obtained under the Znads dissolution peaks suggest that 0.7 monolayers are deposited, with each Zn ad-atom occupying one active site and transferring two electrons. The total loss of mass due to the dissolution of the Zn ad-layer was 136.6 ng cm−2 and the mass increase due to PtO formation was found to be only 12 ng cm−2 less than the theoretical ones, 157.5 and 37.4 ng cm−2, respectively, indicating that both processes are overlapped. In this way it is proposed that an adsorbed by-layer of Zn and OH− ions is formed. 相似文献