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排序方式: 共有236条查询结果,搜索用时 328 毫秒
51.
Dr. Sen Ye Dr. Nir Hananya Dr. Ori Green Dr. Hansen Chen Angela Qian Zhao Prof. Dr. Jiangang Shen Prof. Dr. Doron Shabat Prof. Dr. Dan Yang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(34):14432-14436
Selective and sensitive molecular probes for hydrogen peroxide (H2O2), which plays diverse roles in oxidative stress and redox signaling, are urgently needed to investigate the physiological and pathological effects of H2O2. A lack of reliable tools for in vivo imaging has hampered the development of H2O2 mediated therapeutics. By combining a specific tandem Payne/Dakin reaction with a chemiluminescent scaffold, H2O2-CL-510 was developed as a highly selective and sensitive probe for detection of H2O2 both in vitro and in vivo. A rapid 430-fold enhancement of chemiluminescence was triggered directly by H2O2 without any laser excitation. Arsenic trioxide induced oxidative damage in leukemia was successfully detected. In particular, cerebral ischemia-reperfusion injury-induced H2O2 fluxes were visualized in rat brains using H2O2-CL-510 , providing a new chemical tool for real-time monitoring of H2O2 dynamics in living animals. 相似文献
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Akira Ohashi Mayuko Ogiwara Rieko Ikeda Haruki Okada Kousaburo Ohashi 《Analytical sciences》2004,20(9):1353-1357
Cloud point extraction was successfully applied to the preconcentration of phenothiazine derivatives, such as pericyazine (PC), chlorpromazine (CP) and fluphenazine (FUL), for gas chromatography (GC). Phenothiazine derivatives were separated from surfactants by passing the surfactant-rich phase through a cation exchange column after cloud point extraction, permitting the determination of the phenothiazine derivatives extracted in the surfactant-rich phase by GC. The optimal condition for the cloud point extraction of phenothiazine derivatives was also investigated using Triton X-100, Triton X-114, and PONPE10. Triton X-114 provided the most efficient recovery of phenothiazine derivatives among the surfactants used. The addition of sodium chloride and excess ammonia to the sample solution resulted in a decrement of the recovery of the phenothiazine derivatives. The proposed method was applied to the determination of phenothiazine derivatives in spiked human serum by GC. The recoveries of PC, CP, and FUL in spiked human serum were 95.1%, 87.1%, and 84.7%, respectively. 相似文献
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Inside Cover: General and Facile Route to Isomerically Pure Tricyclic Peptides Based on Templated Tandem CLIPS/CuAAC Cyclizations (Angew. Chem. Int. Ed. 2/2018)
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Verlet JR Bragg AE Kammrath A Cheshnovsky O Neumark DM 《The Journal of chemical physics》2004,121(20):10015-10025
Electron-nuclear relaxation dynamics are studied in Hg(n) (-) (11 相似文献
60.
R. Rozik R. Oriňàková K. Markušová L. Trnková 《Journal of Solid State Electrochemistry》2006,10(7):423-429
This paper describes a process of electrolytic deposition of nickel–cobalt (Ni–Co) binary alloy on Fe powder. Electrochemical behavior of this binary alloy was studied by cyclic voltammetry with a paraffin impregnated graphite electrode as a working electrode. Deposition of individual metals (Ni, Co), as well as the simultaneous nickel–cobalt co-deposition, was performed in aqueous solutions (Watts-type electrolyte) both with and without Fe powder. Special attention was paid to the influence of suspension density on the electrode process. This density affects on the quality of iron powder electroplating. Preferential deposition of the less noble metal (Co) leading to its higher content in the deposit was observed in contrast to the more noble one (Ni) in spite of higher content of Ni in the plating solution. This anomalous phenomenon–known already for other metals (Zn, Cd, Sn)–has been confirmed and investigated for iron-group metals (Fe, Co, Ni) in this work. Electrolytic deposition of Ni–Co binary alloys, including anomalous behavior is a complicated process. Understanding the anomalous behavior would lead to better control of the deposition process and to explanation of the mechanism of Ni–Co co-deposition. 相似文献