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实验在6只蟾蜍和19只小白鼠上进行。观察紫苏外用于血管是否有收缩血管的作用。实验结果表明用药后的血管口径与用药前相比，均能明显缩小，有统计意义（p＜0．05～p＜0．01）。这种收缩血管的作用，不为α-受体阻断剂所阻断。此外去鞣酸紫苏和去阳离子紫苏，均能使血管收缩。设想紫苏含有多种活性成分，共同参与血管的收缩作用。
Experiments were performed on 6 baboons and 19 mice. Observe whether the use of basil outside the blood vessels has the effect of constricting blood vessels. The experimental results showed that the caliber of the blood vessels after drug administration was significantly reduced compared with that before drug use, with statistical significance (p<0.05-p<0.01). This contraction of blood vessels is not blocked by alpha-blockers. In addition to the citrate basil and to the cationic perilla, can make blood vessels shrink. It is assumed that perilla contains a variety of active ingredients and participates in the contraction of blood vessels.