DMPO

The formation of free radicals OH and H in a naturally air-saturated aqueous solution exposed to therapeutic CW ultrasound at the frequency of 820 kHz has been confirmed by using spin trapping 5, 5-dimethyl-1-pyrroline-1-oxide ( DMPO) and electron spin resonance ( ESR) technique.

本文利用5,5-dimethy1-1-purrolinel-oxide（DMPO）自旋捕集剂及电子自旋共振（ESR）技术研究证明，理疗级超声辐照可在自然空气饱和的水溶液中导致OH及H自由基的形成。

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The purpose of this study was to compare the dosimetric differences between traditional technique and direct machine parameter optimization ( DMPO) technique in the treatment of nasopharyngeal carcinoma ( NPC) using step and shoot IMRT.

本研究比较鼻咽癌静态调强放射治疗（IMRT）中采用直接机器参数优化（DMPO）技术和传统技术的剂量学差异。

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Method Hydroxyl radicals produced in Fenton reaction is determinated by ESR with spin trapping technique, and the effects of antioxidants on eliminating hydroxyl radicals were related with the decrease of relative peak height of ESR spectra of DMPO-OH · adducts.

方法通过加入水溶性的抗氧化剂，减弱DMPO自旋捕获Fenton反应产生的羟自由基的加合物（DMPO-OH·）信号强度，信号强度减弱的程度反映抗氧化剂清除羟自由基的能力。

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The signal of a nitrogen-centered radical adduct of DMPO was observed. The results obtained indicate that the trapped radical is a cation radical of diamine produced from diamine and photogenerated hole.

观察到DMPO与氮中心自由基加合物的ESR信号，表明捕捉到的自由基是脂二胺与光生空穴作用而产生的胺的阳离子自由基。

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Their scavenging effect on Hydroxyl free radicals have been studied by ESR technique with DMPO as spin trap.

其中（4）为新化合物。用电子自旋共振技术（ESR）研究了它们对羟自由基即（·OH）的清除作用。

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Objective To compare two planning modes, multiple-step ( MS) and direct machine pa-rameter optimization ( DMPO) modes, for intensity-modulated radiation therapy.

目的分步设计和直接子野优化是设计静态调强放疗计划的两种模式，本研究比较两种计划模式的特点。

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ESR Studies of Radical Produced in the Photosensitive Systems of Hematoporphyrin Derivatives by Spin Trapping Agent DMPO

在血卟啉衍生物光敏体系中DMPO捕集自由基的ESR研究

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