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101.
Hideyuki Takahashi Ayako Sato Masaru Takakura Norihisa Mori Juergen Boerder Walter Knoll John Critchell 《Mikrochimica acta》2006,155(1-2):295-300
A novel specimen preparation method has been devised utilizing an Ar ion beam with a masking plate and an apparatus for this
method has been developed for the preparation of good quality cross sections for high spatial resolution microscopy and microanalysis.
This apparatus is defined as a Cross-section Polisher. The method overcomes most of the drawbacks inherent in the traditional
method of mechanical grinding and polishing and enabled us to prepare good quality cross sections with much larger areas than
those prepared by a focused ion beam method, essentially retaining the excellent characteristics of the latter method.
Microstructural observations of corrosion morphology and chemical analysis of corrosion products in a corrosion-resistant
alloy (Alloy 825) with a thermal field emission type electron probe X-ray microanalyzer are reported to show the power of
the Cross-section Polisher. 相似文献
102.
Morikawa T Matsuda H Nishida N Ohgushi T Yoshikawa M 《Chemical & pharmaceutical bulletin》2004,52(11):1387-1390
Three new aromatics glycosides, hyuganosides II, IIIa, and IIIb, were isolated from a Japanese folk medicine, the roots of Angelica furcijuga KITAGAWA. The structures of the new glycosides were determined on the basis of chemical and physicochemical evidence. 相似文献
103.
Kosaku Tamura Masashi Shiotsuki Norihisa Kobayashi Toshio Masuda Fumio Sanda 《Journal of polymer science. Part A, Polymer chemistry》2009,47(14):3506-3517
Novel conjugated polymers containing 3,9‐ or 2,9‐linked carbazole units in the main chain were synthesized by the polycondensation of ethynyl‐ and iodo‐substituted 9‐arylenecarbazolylene monomers, and their optical and electrical properties were studied. Polymers with weight‐average molecular weights of 3400–12,000 were obtained in 76–99% yields by the Sonogashira coupling polycondensation in piperidine or tetrahydrofuran (THF)/piperidine at 30 °C for 48 h. All the 3,9‐linked polymers absorbed light around 300 nm. The para‐phenylene‐linked polymer also absorbed light around 350 nm, while meta‐phenylene‐linked one did not. The 3,9‐linked polymers absorbed light at a wavelength longer than the 2,9‐linked one. The polymers emitted blue fluorescence with high quantum yields (0.21–0.78) upon excitation at the absorption maxima. The polymers were oxidized around 0.6 V, and reduced around 0.5 V. Poly( 1 ) showed the dark conductivity of 3.7 × 10?11 S/cm (103 V/cm). © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3506–3517, 2009 相似文献
104.
Accumulating evidence shows that collagen plays important roles in many biological systems by interacting with various proteins. The major limitation to determining protein-binding sites on collagen has been a lack of useful methods. We have developed a new strategy for mapping these sites using a photoreactive cross-linker, APDP. A unique -SH group can be introduced into collagen in the vicinity of the protein-binding sites by DTT reduction of the SS bond in the cross-linked product. To identify the sites of cross-linking in collagen, the strategy used was as follows: (i) derivatization of the free -SH group with fluorescein-5-maleimide (FM); (ii) fragmentation of collagen with an appropriate collagenase; (iii) separation of FM-labeled fragments by two-dimensional diagonal electrophoresis; and (iv) detection of cross-linked partners of collagen-binding protein as fluorescent spots under UV light. This strategy can be used to determine the binding sites of various proteins on collagen. 相似文献
105.
Imaizumi K Watanabe Y Nakamura K Omatsu T Kobayashi N 《Physical chemistry chemical physics : PCCP》2011,13(25):11838-11840
We investigated the properties of 4,4'-biphenyl dicarboxylic acid diethyl ester (PCE). The PCE underwent a 2-step reduction at -1.5 V and -2.2 V. The color of the PCE changed from colorless to yellow in the first step and consequently to red in the second reduction step. A PCE based EC cell using an NiO-modified electrode was also fabricated. The NiO electrode worked as a counter reaction material for PCE reduction. The PCE-NiO cell achieved multi-coloration ranging from colorless to yellow and red, and also achieved high coloration efficiency and long term switching stability. 相似文献
106.
Min Ren Dr. Song‐Song Bao Dr. Norihisa Hoshino Prof. Dr. Tomoyuki Akutagawa Prof. Dr. Bingwu Wang Yu‐Chen Ding Prof. Dr. Shiqiang Wei Prof. Dr. Li‐Min Zheng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(29):9619-9628
A new dysprosium(III) phosphonate dimer {Dy(notpH4)(NO3)(H2O)}2 ? 8 H2O ( 1 ) [notpH6=1,4,7‐triazacyclononane‐1,4,7‐triyl‐tris(methylenephosphonic acid)] that contains two equivalent DyIII ions with a three‐capped trigonal prism environment is reported. Complex 1 can be transformed into {Dy(notpH4)(NO3)(H2O)}2 ( 2 ) in a reversible manner by desorption and absorption of solvent water at ambient temperature. This process is accompanied by a large dielectric response. Magnetic studies reveal that both 1 and 2 show thermally activated magnetization relaxation as expected for single‐molecule magnets. Moreover, the magnetic dynamics of the two compounds can be manipulated by controlling the number of solvent molecules at room temperature. 相似文献
107.
Yuki Shirakawa Dr. Kiyonori Takahashi Dr. Hiroyasu Sato Dr. Norihisa Hoshino Hayato Anetai Prof. Shin-ichiro Noro Prof. Tomoyuki Akutagawa Prof. Takayoshi Nakamura 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(28):6920-6927
The pseudo-polyrotaxane structure of [(H-bpy+)- (DB-24-crown-8)]∞ (H-bpy+ = monoprotonated 4,4-bipyridinium; DB-24-crown-8 = dibenzo-24-crown-8) has been incorporated into the anion radical salt [Ni(dmit)2]− (dmit2− = 1,3-dithiole-2-thione-4,5-dithiolate). (H-bpy+)(DB-24-crown-8)[Ni(dmit)2]− crystallized as two polymorphs, crystals 1 and 2 . Crystal 1 was found to have a lower density and looser packing structure in which H-bpy+ forms a one-dimensional hydrogen-bonding chain that passes though the crown ether ring of DB-24-crown-8. DB-24-crown-8 adopts a U-shaped conformation in which two phenylene rings sandwich one of the pyridyl rings of H-bpy+ to stabilize the structure. The [Ni(dmit)2]− anions are arranged in a layer parallel to the (10) plane with uniform side-by-side interactions. A structural phase transition was observed at 235 K, accompanied by ordering of the polyrotaxane structure. In crystal 1 , at 173 K, H-bpy+ is twisted around the central C−C bond, which perturbs the arrangement of [Ni(dmit)2]− through short C−H⋅⋅⋅S contacts. As a result, the semiconducting behavior, with an activation energy of 0.21 eV, becomes insulating below 235 K. The crystal exhibits ferromagnetic interactions because of the weak side-by-side interactions between [Ni(dmit)2]− anions. Crystal 2 has a similar pseudo-polyrotaxane structure but showed no phase transition. This suggests that the looser crystal packing in crystal 1 induces the structural change of the pseudo-polyrotaxane, perturbing the electron system of [Ni(dmit)2]−. 相似文献