Objective to seek for a method of anti-oxidizing injury by the combination of pulmonary surfactant ( PS) and superoxide dismutase (SOD), as well as a way to enchance the transport of PS-SOD liposome into lung tissue, so as to lessen the injury of lung tissue caused by CPB,hyperxia and NO. The result may be helpful to future clinical work. Methods 1) SOD is labeled by FITC through Clark's method. Its labeling rate is detected through ultraviolet spectrophotometer. The activity of SOD is detected ...