化学交换饱和转移 (CEST) MRI 最近已成为一种通用的分子成像方法,其中可以利用抗磁性化合物生成 MRI 信号。为了扩大 CEST MRI 的应用范围,我们在此系统地研究了具有不同N芳族取代基的N芳基酰胺的 CEST 特性,揭示了它们的化学位移 (4.6–5.8 ppm) 和交换率(高达数千 s -1)与烷基酰胺相比,更适合用作 CEST 试剂。作为第一个概念验证研究,我们使用 CEST MRI 直接通过其固有的 CEST 信号检测药物醋丁洛尔的酶代谢,无需任何化学标记。我们的研究表明N芳基酰胺可能使许多含N-芳基酰胺的药物和作用于N-芳基酰胺的多种酶的代谢的无标记CEST MRI检测成为可能,极大地扩展了CEST MR分子成像的范围。
<i>N</i>
‐Aryl Amides as Chemical Exchange Saturation Transfer Magnetic Resonance Imaging Contrast Agents
作者:Xuekang Cai、Jia Zhang、Jiaqi Lu、Long Yi、Zheng Han、Shuixing Zhang、Xing Yang、Guanshu Liu
DOI:10.1002/chem.202002415
日期:2020.9.10
amides. As the first proof‐of‐concept study, we used CEST MRI to detect the enzymatic metabolism of the drug acebutolol directly by its intrinsic CEST signal without any chemical labeling. Our study implies that N‐aryl amides may enable the label‐free CEST MRIdetection of the metabolism of many N‐aryl amide‐containing drugs and a variety of enzymes that act on N‐aryl amides, greatly expanding the scope
化学交换饱和转移 (CEST) MRI 最近已成为一种通用的分子成像方法,其中可以利用抗磁性化合物生成 MRI 信号。为了扩大 CEST MRI 的应用范围,我们在此系统地研究了具有不同N芳族取代基的N芳基酰胺的 CEST 特性,揭示了它们的化学位移 (4.6–5.8 ppm) 和交换率(高达数千 s -1)与烷基酰胺相比,更适合用作 CEST 试剂。作为第一个概念验证研究,我们使用 CEST MRI 直接通过其固有的 CEST 信号检测药物醋丁洛尔的酶代谢,无需任何化学标记。我们的研究表明N芳基酰胺可能使许多含N-芳基酰胺的药物和作用于N-芳基酰胺的多种酶的代谢的无标记CEST MRI检测成为可能,极大地扩展了CEST MR分子成像的范围。
Reversible and irreversible inhibitory activity of succinic and maleic acid derivatives on acetylcholinesterase
against the time of incubation at several different inhibitor concentrations were determined. The K(i) for reversible competitiveinhibitors was determined. For irreversible inhibitors the K(i) for the dissociationconstant of the enzyme-inhibitor complex at the beginning of the recognition process was also determined as well as the inactivation constant of the enzyme-inhibitor adduct formation k(+2) and
Silver halide color photographic light-sensitive material
申请人:KONICA CORPORATION
公开号:EP0422505A1
公开(公告)日:1991-04-17
A silver halide photographic light-sensitive material is disclosed, which contains a novel yellow coupler in its silver hlide emulsion layer. The yellow coupler is represented by the following Formula I:
wherein Y is a hydrogen bond donating group; R is an alkyl group, an aryl group or a heterocyclic group; R₃ is a halogen atom, a hydroxyl group, a nitro group or a monovalent organic group; m is an integer of 0 to 4, provided that the groups represented by R₃ may be the same or different when m is 2 or more; and Z is a hydrogen atom or a substituent capable of splitting off upon rection with the oxdation product of an aromatic primary amine color developing agent.
本发明公开了一种卤化银感光材料,其卤化银乳剂层中含有一种新型黄色耦合剂。黄色耦合剂由下式 I 表示:
其中,Y 是氢键捐赠基团;R 是烷基、芳基或杂环基团;R₃ 是卤素原子、羟基、硝基或一价有机基团;m 是 0 至 4 的整数,但当 m 为 2 或 2 以上时,R₃ 所代表的基团可以相同或不同;Z 是氢原子或取代基,在与芳香族伯胺显色剂的氧化产物反应时能够分裂。