This paper describes two new species in the genus Eumerus Meigen,1822(Diptera:Syrphidae)from Alashan Right Banner of China.Eumerus alxaensis Huo&Liu sp.nov.is similar to E.tuberculatus Rondani,but differs from the...This paper describes two new species in the genus Eumerus Meigen,1822(Diptera:Syrphidae)from Alashan Right Banner of China.Eumerus alxaensis Huo&Liu sp.nov.is similar to E.tuberculatus Rondani,but differs from the latter by mesonotum without whitish pollinose middle stripes,tergite 4 with distinctly L-shaped whitish pollinose bands,eyes with long and dense hairs in male but shorter in female,hypandrium ventrally with a semicircular sheet protruding on the middle of lateral margins.Eumerus seximaculatum Huo&Liu sp.nov.is allied to E.strigatus(Fallén),but differs from the latter by eyes bare,vertex covered with pale yellow hairs,whitish pollinose bands on broader tergites,sternite 4 of male with deeply concave posterior margin and male terminalia distinctly different.展开更多
文摘目的:优化锁阳籽油的萃取条件并分析成分。方法:通过响应面设计优化超临界CO_2流体萃取锁阳籽油的试验条件,采用GC-MS方法对锁阳籽油进行成分分析。结果:优化的锁阳籽油超临界流体萃取条件为:萃取压力29 Pa、萃取温度37℃、CO_2流量20 m L/min、萃取时间2.5 h,在此条件下萃取率为4.71%。同时,对最优条件下所获萃取物进行了GC-MS分析,共鉴定出34种化合物。锁阳籽油中脂肪酸含量达97.69%,主要成分为反式油酸(35.589%)、十六烷酸(14.993%)、8,10-二甲氧基十八烷酸(11.633%)。结论:应用优化所得萃取条件萃取锁阳籽油,萃取率相对较高。锁阳籽油中以不饱和脂肪酸和甲氧基酸为主,二者含量共占提取物的66.61%。
基金This research is supported by the science and technology project of Alxa League(AMYY202020-1).
文摘This paper describes two new species in the genus Eumerus Meigen,1822(Diptera:Syrphidae)from Alashan Right Banner of China.Eumerus alxaensis Huo&Liu sp.nov.is similar to E.tuberculatus Rondani,but differs from the latter by mesonotum without whitish pollinose middle stripes,tergite 4 with distinctly L-shaped whitish pollinose bands,eyes with long and dense hairs in male but shorter in female,hypandrium ventrally with a semicircular sheet protruding on the middle of lateral margins.Eumerus seximaculatum Huo&Liu sp.nov.is allied to E.strigatus(Fallén),but differs from the latter by eyes bare,vertex covered with pale yellow hairs,whitish pollinose bands on broader tergites,sternite 4 of male with deeply concave posterior margin and male terminalia distinctly different.