Identifying the sources of organic matter in marine and riverine sediments of Bohai Bay and its catchment using carbon and nitrogen stable isotopes

Carbon and nitrogen stable isotopes are useful tracers for distinguishing marine and terrestrial plant sources of sedimentary organic matter(OM),and for identifying OM from different types of plants.By analyzing the carbon and nitrogen stable isotopes of marine and riverine sediments from Bohai Bay and its catchment,we were able to identify the source of OM in these sediments.The stable carbon isotope values of Bohai Bay sediments were between-22.94‰ and-23.90‰,while those of riverine sediments were from-24.45‰ to-32.50‰.Marine algae were the main source of OM in Bohai Bay sediments.However,lacustrine algae were the main source of riverine sediments,not terrestrial OM.The nitrogen isotopes in Bohai Bay sediments decreased in eastward direction,with increasing distance from the coastline,which suggested a higher degree of impact from human activities along the coast.     

针刺结合半导体激光治疗颈源性高血压病45 例临床观察

目的：探讨针刺结合半导体激光治疗颈源性高血压病的临床疗效。方法：将90 例颈源性高血压病患者随机分为治疗组和对照组,每组各45 例。治疗组予以针刺结合半导体激光治疗,对照组单用针刺治疗。治疗14 d后,观察患者血压变化、采用视觉模拟评分法（VAS）评价疼痛程度,并观察不良反应及复发情况。结果：2组收缩压和舒张压及VAS评分治疗前后组内比较及治疗后组间比较,差异均有统计学意义（P＜0.05）;治疗组不良反应发生率为6.67%（3/45）,低于对照组的31.11%（14/45）,2组比较,差异有统计学意义（P＜0.05）;复发率治疗组为11.11%（5/45）,低于对照组的31.11%（14/45）,2组比较,差异有统计学意义（P<0.05）。结论：针刺结合半导体激光治疗颈源性高血压病疗效确切,且毒副作用少、复发率低,值得临床推广。