Capturing exchange using periodic radiofrequency irradiation.

Capturing exchange using periodic radiofrequency irradiation.
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DOI:
10.1016/j.jmr.2018.09.001
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发表时间:
2018-11
期刊:
Journal of magnetic resonance (San Diego, Calif. : 1997)
影响因子:
--
通讯作者:
Michaeli S
Michaeli S
中科院分区:
其他
文献类型:
--
作者:
Liimatainen T;Laakso H;Idiyatullin D;Mangia S;Michaeli S

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本文研究了周期性射频(RF)照射期间具有不同化学位移的两个位点之间的化学交换耦合的自旋系统的动力学。当在频率扫描过程中应用有效频率的瞬时 π 翻转时,在实验室参考系中,对于小磁化顶角,观察到交换引起的弛豫率常数显着增加。速率常数的增加对应于射频脉冲期间周期性照射产生的边带。交换引起的弛豫率常数取决于交换条件、射频功率和照射周期。所描述的现象有望应用于研究蛋白质动力学和在 MRI 中生成交换特异性松弛对比度。
The dynamics of spin system coupled by chemical exchange between two sites with different chemical shifts during periodic radiofrequency (RF) irradiation was here investigated. When the instantaneous π-flip of effective frequency during the course of frequency sweep was applied, a significant increase of exchange-induced relaxation rate constants was observed for small tip angle of magnetization in the laboratory frame of reference. This increase of the rate constants corresponds to the side bands generated by the periodic irradiation during the RF pulses. The exchange - induced relaxation rate constants depend on the exchange conditions, the RF power and the irradiation period. The described phenomenon promises applications for studying protein dynamics and for generating exchange specific relaxation contrasts in MRI.
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