Image findings and clinical significance of aberrant right subclavian artery / 中国现代医生

Objective To discuss the aberrant right subclavian artery in CT,X-ray imaging manifestations and clinical meanings. Methods Analyzed 34 aberrant right subclavian artery cases' imaging features retrospectively and explicitly understand the clinical datas.At the same time,analyzed clinical meanings based on the documents. Results 8 cases in X-ray barium meal examination,6 cases showed that esophagus at aortic arch margo superior in back-front and oblique directions,runs a lower left to upper right spiral impressions,which was smooth,and the esophagus was locally cramped.CT in all 34 cases,in a single lay,aberrant subclavian artery was manifested as a soft-tissue nodule alongside or behind the esophagus,or a linear leaf,both connected to the aortic arch,and the density of them was equal to the vessels'.Continuous lays and rebuilded images show that aberrant right subclavian artery originates from the distal in-wall of aortic arch,and turns around the esophagus toward the upper right.It could impress the esophagus,but most of the patients had no symptoms.in a few esophagus and trachea seriously impressed cases,particularly in the aged,ocured the dysphagia and shortness of breath. Conclusion Aberrant right subclavian artery is easily found out in CT examina-toin,and observed the impression to the esophagus and trachea.in some cases,it also ocures in barium meal,but af-firmed by CT. To correctly understand the aberrant right subclavian artery 's imaging manifestions have a significant meanings in clinic.

Effects of continuous cropping obstacle on growth of Angelica sinensis and its mechanism / 中国中药杂志

<p><b>OBJECTIVE</b>To study the effects of continuous cropping obstacles on growth of Angelica sinensis.</p><p><b>METHOD</b>The growth indexes, photosynthetic characteristic, activity of leaf protective enzymes, and the yield, essential oil content and extract content were determined.</p><p><b>RESULT</b>Continuous cropping decreased the growth and the yield, essential oil content, extract content of A. sinensis. Photosynthetic pigment, which include Chla and Chlb, and photosynthetic rate of A. sinensis leaves decreased. Activity of leaf SOD, POD and CAT were also inhibited. The content of proline, soluble sugar and MDA increased.</p><p><b>CONCLUSION</b>Through decreasing the activity of protective enzymes and their ability of cleaning free radical, continuous cropping made free radical remain in plant so that induced membrane lipid peroxidization, electrolytic leakage became heavier, content of proline and soluble sugar increased. The external manifestation of this influences were that plant growth was inhibited, content of photosynthetic pigments decreased, so did the intensity of photosynthesis and respiration, content of dry mass.</p>

Effect of various rotation systems on yield of Angelica sinensis and microbial populations in its rhizosphere / 中草药

Objective To study the effects of four rotation system on the soil microbial populations in rhizosphere,yield,and recovery rate of Ditylenchus destructor of Angelica sinensis.Methods In rhizosphere soil,the microbe amount of various rotation system was determined with the flat dilution,the bacteria were counted with the culture medium of beef-cream and peptone,the fungi were counted with the Martin culture medium,the actinomyces was counted with the improved Gao 1 culture medium.Results Compared with the rotation cropping,the bacterium amount of companion,continuous,and 3a cropping was decreased by 15.76%,30.67%,and 34.24%,respectively;The fungi amount was increased by 24.73%,119.28%,and 135.77%;The diversity indexes of microbe were decreased by 47.90%,78.84%,and 80.63%,and the yields of A.sinensis were decreased by 10.59%,29.52%,and 57.85%;The recovery rate of D.destructor was 1.37,2.52,and 4.12 times.Conclusion The total microbes,which could be cultured in soil,will be decreased.The amount of bacterium,actinomycetes,diversity index and yields,recovery rate of the first grade of A.sinensis were decreased,while fungi and recovery rate of the third grade and substandard of A.sinensis,recovery rate of D.destructor increased with the continuous cropping increasing.