methylene radical

1. Objective To investigate the effect of pulmonary injury after intestinal ischemia reperfusion ( I-R), and the mechanism of methylene blue ( MB) to radical oxygen species ( ROS).
   目的观察肠缺血再灌注（I／R）后对肺脏的影响，探讨亚甲蓝（MB）的抗自由基（ROS）损伤作用及机制。
2. It has five unsaturated bonds and four active methylene, which makes it vulnerable to light, heat, metals and free radical.
   EPA有五个不饱和键和4个活泼的亚甲基，这使得EPA极易受光、热、金属元素及自由基的影响。

noun

1. the bivalent radical CH2 derived from methane

   Synonym:    methylene groupmethylene