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91.
Haruyuki Okamura Minoru Kayanoki Kohei Takada Hideyuki Nakajiri Keiko Muramatsu Munenori Yamashita Masamitsu Shirai 《先进技术聚合物》2012,23(8):1151-1155
High‐resolution screen printing was devised. New resist formulation contains a base polymer, which consists of acid‐labile tetrahydropyranyl‐protected carboxylic acid, hydroxyl, and methacrylic functions. As crosslinkers, multifunctional acrylates were employed. Photoacid generators were used for pattern formation. A 10‐µm feature size of resist on a screen plate was obtained on irradiation at 365 nm and followed by development on a stainless steel screen. Post‐exposure curing improved the mechanical characteristics of the resist patterns. A 13‐µm feature size silver circuit was successfully printed on poly(ethylene terephthalate) film without defect. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
92.
Masamitsu Iino 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2010,86(3):244-256
Changes in the intracellular Ca2+ concentration regulate numerous cell functions and display diverse spatiotemporal dynamics, which underlie the versatility of Ca2+ in cell signaling. In many cell types, an increase in the intracellular Ca2+ concentration starts locally, propagates within the cell (Ca2+ wave) and makes oscillatory changes (Ca2+ oscillation). Studies of the intracellular Ca2+ release mechanism from the endoplasmic reticulum (ER) showed that the Ca2+ release mechanism has inherent regenerative properties, which is essential for the generation of Ca2+ waves and oscillations. Ca2+ may shuttle between the ER and mitochondria, and this appears to be important for pacemaking of Ca2+ oscillations. Importantly, Ca2+ oscillations are an efficient mechanism in regulating cell functions, having effects supra-proportional to the sum of duration of Ca2+ increase. Furthermore, Ca2+ signaling mechanism studies have led to the development of a method for specific inhibition of Ca2+ signaling, which has been used to identify hitherto unrecognized functions of Ca2+ signals. 相似文献
93.
[reaction: see text] The TiCl(4)-catalyzed Evans-aldol reaction of optically active 3,3,3-trifluoropropanoic imide gave the non-Evans syn product stereoselectively, whereas the Reformatsky reaction of 2-bromo-3,3,3-trifluoropropanoic imide in the presence of Et(3)Al led to the Evans anti product. These new approaches enabled us to synthesize all stereoisomers of trifluoromethylated aldol products for the first time. 相似文献
94.
Shin-ichi Yusa Megumi Shibata Masamitsu Noborizato 《Journal of Dispersion Science and Technology》2013,34(2):287-292
Heat and salt induced aggregation of three well-defined double hydrophilic block copolymers (DHBCs) of sodium 2-(acrylamido)-2-methylpropanesulfonate (AMPS) and N-isopropylacrylamide (NIPAM) with constant chain length of the PAMPS block (with number-average degree of polymerization, DP n = 61) and varying chain length of the PNIPAM block with DP n = 11, 23, and 34 synthesized via reversible addition-fragmentation chain transfer (RAFT) controlled radical polymerization was investigated by turbidity, dynamic light scattering (DLS) and 1H NMR measurements. In the presence of salt or with an increase in temperature, the diblock copolymers form micelles with a PNIPAM core and PAMPS corona. The heat and salt induced aggregation in dilute aqueous solutions dependant on the molecular characteristics of the DHBC (DP n of the PNIPAM block) was observed. The DHBC becomes amphiphilic as the PNIPAM block loses hydrophilicity at higher temperature above its lower critical solution temperature (LCST). Furthermore, the presence of salt induces salting out effect of the uncharged PNIPAM block. The diblock copolymer thus forms nanosized aggregates at a high temperature or in the presence of salt. These aggregates may be multiple aggregates due to inter-micellar aggregation of the spherical core-corona micelles. 相似文献
95.
Kato H Hoshino M Tanaka H Limão-Vieira P Ingólfsson O Campbell L Brunger MJ 《The Journal of chemical physics》2011,134(13):134308
We report results from measurements for differential and integral cross sections of the unresolved (1)B(1u) and (3)E(2g) electronic states and the (1)E(1u) electronic state in benzene. The energy range of this work was 10-200 eV, while the angular range of the differential cross sections was ~3°-130°. To the best of our knowledge there are no other corresponding theoretical or experimental data against which we can compare the present results. A generalized oscillator strength analysis was applied to our 100 and 200 eV differential cross section data, for both the (1)B(1u) and (1)E(1u) states, with optical oscillator strengths being derived in each case. The respective optical oscillator strengths were found to be consistent with many, but not all, of the earlier theoretical and experimental determinations. Finally, we present theoretical integral cross sections for both the (1)B(1u) and (1)E(1u) electronic states, as calculated within the BEf-scaling formalism, and compare them against relevant results from our measurements. From that comparison, an integral cross section for the optically forbidden (3)E(2g) state is also derived. 相似文献
96.
Shodai Takahashi Kenjiro Hanaoka Yohei Okubo Honami Echizen Takayuki Ikeno Toru Komatsu Tasuku Ueno Kenzo Hirose Masamitsu Iino Tetsuo Nagano Yasuteru Urano 《化学:亚洲杂志》2020,15(4):524-530
Fluorescence imaging in the near‐infrared (NIR) region (650–900 nm) is useful for bioimaging because background autofluorescence is low and tissue penetration is high in this range. In addition, NIR fluorescence is useful as a complementary color window to green and red for multicolor imaging. Here, we compared the photoinduced electron transfer (PeT)‐mediated fluorescence quenching of silicon‐ and phosphorus‐substituted rhodamines (SiRs and PRs) in order to guide the development of improved far‐red to NIR fluorescent dyes. The results of density functional theory calculations and photophysical evaluation of a series of newly synthesized PRs confirmed that the fluorescence of PRs was more susceptible than that of SiRs to quenching via PeT. Based on this, we designed and synthesized a NIR fluorescence probe for Ca2+, CaPR‐1 , and its membrane‐permeable acetoxymethyl derivative, CaPR‐1 AM , which is distributed to the cytosol, in marked contrast to our previously reported Ca2+ far‐red to NIR fluorescence probe based on the SiR scaffold, CaSiR‐1 AM , which is mainly localized in lysosomes as well as cytosol in living cells. CaPR‐1 showed longer‐wavelength absorption and emission (up to 712 nm) than CaSiR‐1 . The new probe was able to image Ca2+ at dendrites and spines in brain slices, and should be a useful tool in neuroscience research. 相似文献
97.
Masato Ohmi Manabu Tanizawa Atsushi Fukunaga Masamitsu Haruna 《Optical and Quantum Electronics》2005,37(13-15):1175-1183
In laser ablation of biological tissue, tomography of the tissue surface is necessary for measurement of the crater shape and the crater depth. In this paper, we demonstrate in-situ observation of biological-tissue surface in laser ablation by optical coherence tomography (OCT). Depth of a crater of human tooth is measured by these OCT images, and then the ablation rate of 0.21 μm/pulse is determined. 相似文献
98.
Md. Nizam Uddin Osama A. Fouad Masaaki Yamazato Masamitsu Nagano 《Applied Surface Science》2005,240(1-4):120-130
Carbon nitride thin films were deposited on Si(1 0 0) substrate by microwave plasma-enhanced chemical vapor deposition (PECVD). Hexamethylenetetramine (HMTA) was used as carbon and nitrogen source while N2 gas was used as both nitrogen source and carrier gas. The sp3-bonded C---N structure in HMTA was considered significantly in the precursor selection. X-ray diffraction analysis indicated that the film was a mixture of crystalline - and β-C3N4 as well as graphitic-C3N4 and β-Si3N4 which were not easily distinguished. Raman spectroscopy also suggested the existence of - and β-C3N4 in the films. X-ray photoelectron spectroscopy study indicated the presence of sp2- and sp3-bonded C---N structures in the films while sp3C---N bonding structure predominated to the sp2 C---N bonding structure in the bulk composition of the films. N was also found to be bound to Si atoms in the films. The product was, therefore, described as CNx:Si, where x depends on the film depth, with some evidences of crystalline C3N4 formation. 相似文献
99.
A novel type of tunable laser is developed that integrates dye-doped plastics laser waveguides with a distributed feedback
structure. The waveguide matrix is dye doped poly-hydroxyethylmethacrylate:methylmethacrylate, and a single-mode waveguide
is achieved by refractive index control. The wavelength coverage is over 560-1100 nm using a frequency doubled Nd:YAG microchip
laser. The miniaturizing of the optical-pumped solid-state dye laser extended the lifetime to more than million shots and
decreased the required laser threshold energy to less than 1 $mUJ. Novel type spectroscopic applications using the multiple
wavelength laser array chip are also proposed and demonstrated. 相似文献
100.
Kanji Suyama Hiroaki Iriyama Masahiro Tsunooka Masamitsu Shirai 《Journal of polymer science. Part A, Polymer chemistry》2004,42(11):2612-2620
Carbamoyloxyimino (COI) groups are precursors of photochemically base‐generating groups as well as those of thermally isocyanate‐generating groups. In this study, photochemical and thermal reactions of COI groups in oligomers were investigated by spectral analyses and solubility changes. Oligomers bearing three types of COI groups were prepared. COI groups in all oligomer films were photolyzed on irradiation with 254 nm of light and were deblocked to form isocyanato groups on heating. From the IR spectral analyses, the formation of urea linkage was confirmed by the decrease in isocyanato groups and peak generation because of urea groups on postexposure bake (PEB) treatment. For all oligomer films, PEB was effective for the enhancement of insolubilization of the films in tetrahydrofuran. Heating followed by irradiation was also effective for the insolubilization. These results indicated that photochemical and thermal treatments of COI groups afforded highly sensitive crosslinking systems because of photochemically generated basic groups and thermally generated isocyanato groups. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2612–2620, 2004 相似文献