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171.
The influence from high-n dielectronic satellites to Kɑ resonance line in helium-like aluminium
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Based on the multi-configuration Dirac-Fock method, this paper has made theoretical calculations for the dielectronic recombination cross-sections and the high-n dielectronic satellites to Kα resonance line in helium-like aluminium ions. It is found that high-n dielectronic satellites are seriously mixed with resonance line, which leads to a significant increase in both the apparent width and the intensity of Kα resonance line. They also induce a positional shift of Kα resonance line. 相似文献
172.
Mikuma T Ohyama T Terui N Yamamoto Y Hori H 《Chemical communications (Cambridge, England)》2003,(14):1708-1709
Haemin, iron(III)-protoporphyrin IX complex, and parallel-quadruplexed d(TTAGGG) have been shown to form a stable coordination complex which exhibits spectroscopic properties remarkably similar to those of haemoproteins. 相似文献
173.
Trifluoroethyl ester-functionalized polysiloxanes can be prepared by block condensation of 3-dichloromethylsilyl-2-methylpropionic acid 2′,2′,2′-trifluoroethyl ester with 1,5-bis(diethylamino)hexamethyltrisiloxane or with disodium tetramethyldisiloxane-1,3-diolate. The functionalized polysiloxanes may serve as supports for a variety of selector groups; for instance, nucleophilic displacements with L-valine-t-butylamide or L-α-naphthylethylamine lead to chiral polysiloxanes in high yields and with high reproducibility. Imidazole accelerates the rate of nucleophilic displacement. Capillary columns coated with such chiral polysiloxanes exhibit high enantioselectivity and thermostability. 相似文献
174.
A design study of the trace characterization, information system TRACIS, which has been partly implemented, is presented. TRACIS provides information on methods for trace characterization along with relevant fundamental data (e.g., physical constants and spectra) as required. The COOD data-base management system is considered to be most appropriate for TRACIS and is explained with examples. A preliminary design of TRACIS is presented. 相似文献
175.
Giuseppe Arena Annalinda Contino Takako Fujimoto Domenico Sciotto Yasuhiro Aoyama 《Supramolecular chemistry》2013,25(4):279-288
Abstract The complexation of tetramethylammonium (TEMA), benzyltrimethylammonium (BTMA), p-nitrobenzyltrimethylammonium (BTMAN) and N, N, N-trimethylanilinium (TMA) by the tetrasulphonate derivative of the resorcinol cyclic tetramer (1), was studied in aqueous solution by 1H NMR and calorimetry. Host 1 specifically recognizes the—N+ (CH3)3 group of TEMA, BTMA and BTMAN, whereas it binds TMA unselectively; TMA is included both via the charged group and the aromatic moiety. The binding constants of all four guests with 1, as determined by both 1H NMR and calorimetric titrations, show that all inclusion processes are almost equally stabilised. ΔHΔ and ΔSΔ values, determined by direct calorimetry, reveal specific interactions that are not expressed in the ΔGΔ terms and indicate that we are dealing with “non-classical hydrophobic effects”. The effects of the structural, conformational and electronic properties of the guests on the forces driving the inclusion processes are discussed. 相似文献
176.
Takako Masamune Hiroko Masamune Tohoru Masamune 《Chemical record (New York, N.Y.)》2013,13(2):257-264
Note from the Editor: It is with great pleasure and enthusiasm that I introduce this essay which accompanies the publication of the fourth segment of the Tetsuo Nozoe Autograph Books. In the conceptualization stages of this project—which shall appear in 15 consecutive issues of The Chemical Record as well as have a significant internet presence—I proposed to my colleagues Eva Wille and Brian Johnson that each segment be accompanied with a specially invited essay or perspective. This proposal was immediately and enthusiastically accepted. To both celebrate the life and warmth of Tetsuo Nozoe, I can hardly imagine a more appropriate essay than one written by two of his grandchildren and one of his own children! I thank the Masamune Family for their touching contribution to this project. The Nozoe Autograph Books and all the accompanying essays, including this essay, are open access for at least a three‐year period at: http://www.tcr.wiley‐vch.de/nozoe . Jeffrey I. Seeman Guest Editor, University of Richmond Richmond, Virginia 23173, USA 相似文献
177.
Ayana Hirata Hajime Ishihara Tatsuji Kawai Takako Nemoto 《Annals of Pure and Applied Logic》2019,170(10):1256-1272
We present statements equivalent to some fragments of the principle of non-deterministic inductive definitions (NID) by van den Berg (2013), working in a weak subsystem of constructive set theory CZF. We show that several statements in constructive topology which were initially proved using NID are equivalent to the elementary and finitary NIDs. We also show that the finitary NID is equivalent to its binary fragment and that the elementary NID is equivalent to a variant of NID based on the notion of biclosed subset. Our result suggests that proving these statements in constructive topology requires genuine extensions of CZF with the elementary or finitary NID. 相似文献
178.
Tomoyasu Hirose Takako KasaiTakafumi Akimoto Ayako EndoAkihiro Sugawara Kazuo NagasawaKazuro Shiomi Satoshi ōmura Toshiaki Sunazuka 《Tetrahedron》2011,67(35):6633-6643
A solution-phase total synthesis of argifin using 3,4,5-tris(octadecyloxy)benzyl tag as a hydrophobic protective group of carboxylic acid was developed to produce 44% overall yield for 16 linear steps. Argifin, a novel class of natural product chitinase inhibitor, is a highly water-soluble cyclic pentapeptide, so hitherto, only solid-phase synthesis techniques have been used to conveniently prepare the compound and its derivatives. 3,4,5-Tris(octadecyloxy)benzyl alcohol (HO-TAGa) and its esters are highly crystalline materials and highly capable of dissolving in less-polar solvents such as dichloromethane, benzene, THF, etc., but insoluble in polar solvents such as methanol and DMSO. The combination of HO-TAGa and Fmoc-based peptide synthesis, together with simple purification by recrystallization from MeOH solution, furnished an efficient and practical route of argifin production in the liquid-phase. 相似文献
179.
Komiya N Muraoka T Iida M Miyanaga M Takahashi K Naota T 《Journal of the American Chemical Society》2011,133(40):16054-16061
Instant and precise control of phosphorescent emission can be performed by ultrasound-induced gelation of organic liquids with chiral, clothespin-shaped trans-bis(salicylaldiminato)Pt(II) complexes, anti-1. Nonemissive solutions of racemic, short-linked anti-1a (n = 5) and optically pure, long-linked anti-1c (n = 7) in organic liquids are transformed immediately into stable phosphorescent gels upon brief irradiation of low-power ultrasound. Emission from the gels can be controlled by sonication time, linker length, and optical activity of the complexes. Several experimental results indicated that structure-dependent homo- and heterochiral aggregations and ultrasound-control of the aggregate morphology are key factors for emission enhancement. 相似文献
180.
Akira Matsumoto Daisuke Mitomi Hiroyuki Aota Jun-ichi Ikeda 《Macromolecular rapid communications》1999,20(7):365-368
During our investigation concerned with the free-radical crosslinking copolymerization of benzyl methacrylate with neopentyl glycol dimethacrylate in the presence of lauryl mercaptan as a chain transfer agent with the intention to remove the obstacles between allyl and vinyl polymerizations, we observed, by chance, popcorn formation in spite of the presence of a large amount of chain transfer agent. 相似文献