当归新品系“DGA2000-02”与对照品种的遗传差异分析

当归新品系"DGA2000-02"是利用兰州重离子加速器研究装置(HIRFL)对"岷归1号"进行重离子束辐照选育出来的。与岷归1号相比,DGA2000-02表现出更强的抗病性,产量也有较大提高。对这两个品种的表型、品质及遗传差异进行了系统的分析。为将来进一步选育产量高、品质好及抗逆性强的新品种提供研究基础

重离子束在中药材品种改良上的应用研究

采用55MeV/u40Ar17+中能离子和110keV14N1+超低能离子分别对当归和党参的种子进行辐照处理,探索高产、优质、抗病的优良新品种

甘肃当归新品系DGA2000-02的选育研究

当归新品系DGA2000-02是采用重离子束55MeV/u40Ar+15离子辐照甘肃当归90-01干种子,按新品种选育程序多年选育而成的。2005—2007年,在定西市岷县、渭源县、漳县、陇西县等地当归品系区域试验中,甘肃当归DGA2000-02平均产鲜当归10621.5kg/hm2,较对照品种(甘肃当归90-01)平均增产鲜当归1386.0kg/hm2,增产率15.0%。生育期790d,茎秆深紫色,根系黄白色。测定结果:总灰分4.2%,酸不溶性灰分0.4%,分别优于对照品种16%和33.3%;浸出物61.4%,较规定指标提高4.4%;阿魏酸0.148%,较规定指标提高2.96倍。质量显著优于对照品种和2005年版《中国药典》规定指标。适宜在海拔2000—2600m、年降水量500—600mm的二阴及高寒阴湿生态区栽培

Measurement of separate electron and positron spectra from 10 to 20 GeV with the geomagnetic field on DAMPE*

The cosmic-ray (CR) electrons and positrons in space are of considerable significance for studying the origin and propagation of CRs. The satellite-borne detector Dark Matter Particle Explorer (DAMPE) has been used to measure the separate electron and positron spectra, as well as the positron fraction. In this study, the Earth's magnetic field is used to distinguish CR electrons and positrons, as the DAMPE detector does not carry an onboard magnet. The energy for the measurements ranges from 10 to 20 GeV, which is currently limited at high energy by the zenith-pointing orientation of DAMPE. The results are consistent with previous measurements based on the magnetic spectrometer by AMS-02 and PAMELA, whereas the results of Fermi-LAT appear to be systematically shifted to larger values