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排序方式: 共有653条查询结果,搜索用时 78 毫秒
651.
Naoya Ieda Masato Sawada Runa Oguchi Masato Itoh Seina Hirakata Daisuke Saitoh Akito Nakao Mitsuyasu Kawaguchi Prof. Kazunobu Sawamoto Prof. Toshitada Yoshihara Prof. Yasuo Mori Prof. Hidehiko Nakagawa 《Angewandte Chemie (International ed. in English)》2023,62(20):e202217585
We present an optochemical O2 scavenging system that enables precise spatiotemporal control of the level of hypoxia in living cells simply by adjusting the light intensity in the illuminated region. The system employs rhodamine containing a selenium or tellurium atom as an optochemical oxygen scavenger that rapidly consumes O2 by photochemical reaction with glutathione as a coreductant upon visible light irradiation (560–590 nm) and has a rapid response time, within a few minutes. The glutathione-consuming quantum yields of the system were calculated as about 5 %. The spatiotemporal O2 consuming in cultured cells was visualized with a hypoxia-responsive fluorescence probe, MAR. Phosphorescence lifetime imaging was applied to confirmed that different light intensities could generate different levels of hypoxia. To illustrate the potential utility of this system for hypoxia research, we show that it can spatiotemporally control calcium ion (Ca2+) influx into HEK293T cells expressing the hypoxia-responsive Ca2+ channel TRPA1. 相似文献
652.
Naoya Ogata 《Macromolecular Symposia》1994,77(1):167-175
Poly(L-glutamate) having amphiphilic side chains was designed as membrane materials for optical resolution of α -amino acids. Solvent- cast films of the poly(L-glutamate) had a self-ordered structure containing α-helix of the poly(L-glutamate). Optical resolutions of various amino acids were carried out through the thin membranes of the amphiphilic poly(L-glutamate). Racemic mixtures of Tryptophan were completely separated through the membrane. Mechanism of the optical resolutions was investigated in terms of molecular recognitions of racemic Tryptophan by the ordered structure of the mambrane. 相似文献
653.
Lihua Lin Pongpen Kaewdee Vikas Nandal Ryota Shoji Hiroyuki Matsuzaki Kazuhiko Seki Mamiko Nakabayashi Naoya Shibata Xiaoping Tao Xizhuang Liang Yiwen Ma Takashi Hisatomi Tsuyoshi Takata Prof. Kazunari Domen 《Angewandte Chemie (International ed. in English)》2023,62(42):e202310607
Photocatalytic water splitting is an ideal means of producing hydrogen in a sustainable manner, and developing highly efficient photocatalysts is a vital aspect of realizing this process. The photocatalyst Y2Ti2O5S2 (YTOS) is capable of absorbing at wavelengths up to 650 nm and exhibits outstanding thermal and chemical durability compared with other oxysulfides. However, the photocatalytic performance of YTOS synthesized using the conventional solid-state reaction (SSR) process is limited owing to the large particle sizes and structural defects associated with this synthetic method. Herein, we report the synthesis of YTOS particles by a flux-assisted technique. The enhanced mass transfer efficiency in the flux significantly reduced the preparation time compared with the SSR method. In addition, the resulting YTOS showed improved photocatalytic H2 and O2 evolution activity when loaded with Rh and Co3O4 co-catalysts, respectively. These improvements are attributed to the reduced particle size and enhanced crystallinity of the material as well as the slower decay of photogenerated carriers on a nanosecond to sub-microsecond time range. Further optimization of this flux-assisted method together with suitable surface modification is expected to produce high-quality YTOS crystals with superior photocatalytic activity. 相似文献