This article was aimed to carry a comparative study on the quality of 16 populations of wild herbs of rare and endangered plant ofPsammosilene tunicoidesin order to provide a basis for its domestication, GAP and selective breeding. Methods for determination of moisture content, total ash and extract content were taken in this comparative study. The results showed that different populations had different moisture content, total ash and extract content. The moisture content and the total ash ofXiang-Shan population were the lowest; and the extract content was the highest. The total ash ofLiu-De population was the highest; and the extract content was the lowest. The moisture content ofShun-Zhou population was the highest. It was concluded that different populations had different quality among 16 populations of wild herbs. Therefore, there was a probability to choose the best population.

This research is designed to detect the dynamic changes of microcirculatory ultrastructure and the MDA content, SOD and GSH-px activity in rat cerebrum immediately, 24h and 48h after exhaustive swimming. The results showed that there were obvious changes of ultrastructure in rat cerebral microcirculation immediately after exhaustive swimming. The changes were resumed in some degree after 24h and recovered almost to the normal after 48h. Immediately after exhaustive swimming, the MDA content did not change obviously; the activity of SOD increased markedly, and then it decreased markedly after 24h, but it increased again after 48h. The activity of GSH-px descended markedly after 24h; it descended synchronously with the decrease of SOD activity, showing that the consumption of SOD and GSH-px should be the most at this time. Therefore, the free radical should be removed in time for reducing the cerebral injury and promoting the recovery of cerebral microcirculation.
Animals ; Brain ; blood supply ; metabolism ; Capillaries ; ultrastructure ; Cerebrovascular Circulation ; Glutathione Peroxidase ; metabolism ; Male ; Malondialdehyde ; metabolism ; Physical Exertion ; Rats ; Rats, Sprague-Dawley ; Superoxide Dismutase ; metabolism