龙胆科龙胆属Gentiana秦艽组Sect.Cruciata多种植物作为中药秦艽及藏药解吉(■)的基原,具有重要的药用价值。在课题组前期品种整理及遗传背景分析基础上,本文分别测定秦艽组10种23个居群69份样品以及外类群椭圆叶花锚Halenia elliptica ...龙胆科龙胆属Gentiana秦艽组Sect.Cruciata多种植物作为中药秦艽及藏药解吉(■)的基原,具有重要的药用价值。在课题组前期品种整理及遗传背景分析基础上,本文分别测定秦艽组10种23个居群69份样品以及外类群椭圆叶花锚Halenia elliptica 3份样品的线粒体nad1基因第2内含子区(nad 1/b-c)以及nad5基因第4内含子区(nad5/d-e)部分序列,对其在秦艽组植物的分子系统发育分析及物种鉴定中的意义进行评价。结果显示:nad1/b-c具一粗壮秦艽G.robusta King ex Hook.f.稳定变异位点;同时,对粗茎秦艽G.crassicaulis Duthie ex Burk.及西藏秦艽G.tibetica King ex Hook.f.有一定物种分辨率;nad5/d-e序列相似度高,仅大叶秦艽G.macrophylla Pall.、黄管秦艽G.officinalis H.Smith及管花秦艽G.siphonantha Maxim.ex Kusnez.存在种内不同基因型。进而基于粗壮秦艽G.robusta King ex Hook.f.nad 1/b-c物种分子标记,设计一特异鉴定引物,建立粗壮秦艽特异性引物-PCR鉴定方法。本工作可为协同进化不完全、遗传背景复杂多样的中藏药高山基原植物DNA条形码的构建提供新思路。展开更多
The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from ...The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared （FTIR） results indicate that sp2 hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425cm-1, respectively. Fhrthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN ~ddition content in the synthesis system.展开更多
In this article, the authors report on the use of Radio Frequency (RF) Magnetron Sputtering combined with Plasma-Based Ion Implantation (PBII) technique to synthesize the Boron-Carbon (B-C) films. High purity of boron...In this article, the authors report on the use of Radio Frequency (RF) Magnetron Sputtering combined with Plasma-Based Ion Implantation (PBII) technique to synthesize the Boron-Carbon (B-C) films. High purity of boron carbide (99.5%) disk was used as a target with an RF power of 300 W. The mixtures of Argon (Ar)-Methane (CH4) ware used as reactive gas under varying CH4 partial flow pressure at the specified range of 0 - 0.15 Pa and fixed total gas pressure and total gas flow at 0.30 Pa and 30 sccm, respectively. The effect of CH4 flow ratio on the friction coefficient of B-C films was studied. The friction coefficient of the film depended on the concentration of B. When it was 10% or lower, the coefficient decreased to 0.2 or lower. In this concentration range of B, the specific wear rate also decreased to the order of 10-7 mm3/Nm, and excellent wear resistance was displayed.展开更多
文摘龙胆科龙胆属Gentiana秦艽组Sect.Cruciata多种植物作为中药秦艽及藏药解吉(■)的基原,具有重要的药用价值。在课题组前期品种整理及遗传背景分析基础上,本文分别测定秦艽组10种23个居群69份样品以及外类群椭圆叶花锚Halenia elliptica 3份样品的线粒体nad1基因第2内含子区(nad 1/b-c)以及nad5基因第4内含子区(nad5/d-e)部分序列,对其在秦艽组植物的分子系统发育分析及物种鉴定中的意义进行评价。结果显示:nad1/b-c具一粗壮秦艽G.robusta King ex Hook.f.稳定变异位点;同时,对粗茎秦艽G.crassicaulis Duthie ex Burk.及西藏秦艽G.tibetica King ex Hook.f.有一定物种分辨率;nad5/d-e序列相似度高,仅大叶秦艽G.macrophylla Pall.、黄管秦艽G.officinalis H.Smith及管花秦艽G.siphonantha Maxim.ex Kusnez.存在种内不同基因型。进而基于粗壮秦艽G.robusta King ex Hook.f.nad 1/b-c物种分子标记,设计一特异鉴定引物,建立粗壮秦艽特异性引物-PCR鉴定方法。本工作可为协同进化不完全、遗传背景复杂多样的中藏药高山基原植物DNA条形码的构建提供新思路。
基金Supported by the National Natural Science Foundation of China under Grant No 51172089the Natural Science Foundation of Guizhou Province Education Department under Grant No KY[2013]183the Natural Science Foundation of Guizhou Province Science and Technology Agency under Grant Nos LH[2015]7232 and LH[2015]7228
文摘The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared （FTIR） results indicate that sp2 hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425cm-1, respectively. Fhrthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN ~ddition content in the synthesis system.
文摘In this article, the authors report on the use of Radio Frequency (RF) Magnetron Sputtering combined with Plasma-Based Ion Implantation (PBII) technique to synthesize the Boron-Carbon (B-C) films. High purity of boron carbide (99.5%) disk was used as a target with an RF power of 300 W. The mixtures of Argon (Ar)-Methane (CH4) ware used as reactive gas under varying CH4 partial flow pressure at the specified range of 0 - 0.15 Pa and fixed total gas pressure and total gas flow at 0.30 Pa and 30 sccm, respectively. The effect of CH4 flow ratio on the friction coefficient of B-C films was studied. The friction coefficient of the film depended on the concentration of B. When it was 10% or lower, the coefficient decreased to 0.2 or lower. In this concentration range of B, the specific wear rate also decreased to the order of 10-7 mm3/Nm, and excellent wear resistance was displayed.
