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One-Dimensional Vertical ECEI Diagnostic for HT-7 Tokamak HT-7托卡马克的一维垂直ECEI诊断

IF 1.7 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

Plasma Science & Technology

Pub Date : 2006-01-01 DOI: 10.1088/1009-0630/8/1/17

Wang Jun, Xu Xiaoyuan, Wen Yi-Zhi, Yu Changxuan, Wan Baonian, N. Luhmann, Wang Jian, Xia Zhengang

At the first stage of the electron cyclotron emission imaging (ECEI) diagnostic project on HT-7, a 16-channel vertical-resolved ECEI diagnostic has been developed and installed on HT-7 tokamak to measure electron cyclotron emission with a temporal resolution of 0.5 μsec. The system works at a fixed frequency of 97.5 GHz. The sample volumes of the system are aligned vertically with a vertical channel spacing of 11 mm, and can be shifted across the plasma cross-section by varying the toroidal magnetic field. The high spatial resolution of the system is achieved by utilizing a low-cost linear mixer/receiver array and an optical imaging system. The focus location may be shifted horizontally when translating one of the optical imaging elements. The details of the system design and laboratory testing of the ECEI optics are presented together with the preliminary experimental results.

在HT-7上的电子回旋发射成像(ECEI)诊断项目的第一阶段，研制了一台16通道垂直分辨率ECEI诊断装置，安装在HT-7托卡马克上，用于测量电子回旋发射，时间分辨率为0.5 μsec。系统工作在97.5 GHz的固定频率下。该系统的样品体积垂直排列，垂直通道间距为11 mm，并且可以通过改变环向磁场在等离子体横截面上移动。该系统的高空间分辨率是利用低成本的线性混频器/接收器阵列和光学成像系统实现的。当平移光学成像元件之一时，焦点位置可以水平移动。介绍了ECEI光学器件的系统设计和实验室测试，并给出了初步的实验结果。

引用次数: 13

Replicase-derived resistance against pea early browning virus in Nicotiana benthamiana is an unstable resistance based upon posttranscriptional gene silencing. 复制酶衍生的抗豌豆早褐化病毒性是一种基于转录后基因沉默的不稳定抗性。

IF 3.5 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

Plasma Science & Technology

Pub Date : 2001-02-01 DOI: 10.1094/MPMI.2001.14.2.196

T van den Boogaart, F Wen, J W Davies, G P Lomonossoff

Virus resistance in Nicotiana benthamiana plants containing a translatable Pea early browning virus (PEBV) 54K sequence from the 201K replicase gene has been reported previously. Resistant plants contain multiple transgene copies divided between two loci. Analysis of a genetic series containing the two loci in separate homozygous or heterozygous condition suggest that only one of the loci is necessary to induce the resistance. The resistance observed in R2 and R3 generations of lines containing both transgene loci in homozygous condition became less consistent in R4 and R5 generations. This inversely correlated with steady-state transgene transcript levels of the segregating populations. The use of recombinant Potato virus X vectors carrying PEBV 54K sequences showed that the resistance is based upon posttranscriptional gene silencing, is non-strand specific, and recognizes 3' located sequences within the PEBV 54K sequence.

此前曾有报道称，含有可翻译的豌豆早期褐变病毒（PEBV）54K 序列（来自 201K 复制酶基因）的烟草植物具有病毒抗性。抗性植株含有多个转基因拷贝，分属两个基因位点。对含有这两个基因位点的基因系列进行分析后发现，只有其中一个基因位点能诱导抗性。在 R2 和 R3 代中观察到的两个转基因位点同源的抗性在 R4 和 R5 代中变得不那么一致。这与分离群体的稳态转基因转录本水平成反比。使用携带 PEBV 54K 序列的重组马铃薯病毒 X 载体表明，抗性是基于转录后的基因沉默，是非链特异性的，并能识别 PEBV 54K 序列中位于 3' 的序列。

引用次数: 19

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