TRANSFER OF THE ATRAZINE-RESISTANT GENE OF BLACK NIGHTSHADE TO SOYBEAN CHLOROPLAST GENOME AND ITS EXPRESSION IN TRANSGENIC PLANTS

The atrazine-resistant psbA gene of black nightshade was transferred to the chloroplast genome of atrazine-susceptible soybean by means of ovary microinjection during the stage of zygote. The identification was carried out by using the methods of spraying the leaves directly with atrazine solution, examining the change of leaf fluorescence kinetics under a brighter light induction, molecular hybridization, etc. The experimental results show that the transgenic soybean plants do have been obtained for the first time.     

基于多基因遗传规划的储层岩石静态模量预测

声发射技术作为一种动态无损检测手段,主要实现对材料产生的缺陷进行动态监测及损伤位置的预测。微机电系统声发射传感器在检测材料疲劳裂纹位置和扩展方向上应用广泛,实现其对材料裂纹的3-D动态位移检测,对于无损检测技术的发展具有重要意义。该文提出了一种新型3-D微机电系统声发射传感器,首先对3-D微机电系统声发射传感器进行了结构设计和性能分析,结构方面主要包括z方向响应传感单元和x、y方向响应传感单元设计;其次通过传感器的阻尼、谐振点处灵敏度计算,证明传感器的性能良好;最后采用有限元软件ANSYS对z方向响应传感单元做了模态和谐响应分析,x、y方向响应传感单元做了模态分析和谐响应分析,仿真结果与理论值吻合较好,验证了结构设计的合理性,对实现材料裂纹的三维动态检测具有一定的参考意义。     

Modulation of brain functional connectivity with manual acupuncture in healthy subjects: An electroencephalograph case studying

Manual acupuncture is widely used for pain treatment and stress control. Previous studies on acupuncture have shown its modulatory effects on functional connectivity associated with one or a few preselected brain regions. To investigate how manual acupuncture modulates the organization of functional networks at a whole-brain level, we acupuncture at ST36 of right leg to obtain electroencephalograph (EEG) signals. By coherence estimation, we determine the synchronizations between all pairwise combinations of EEG channels in three acupuncture states. The resulting synchronization matrices are converted into functional networks by applying a threshold, and clustering coefficients and path lengths are computed as a function of threshold. The results show that acupuncture can increase functional connections and synchronizations between different brain areas. For a wide range of threshold, the clustering coefficient during acupuncture and post-acupuncture period is higher than that during the pre-acupuncture control period, whereas characteristic path length is shorter. We provide further support for the presence of "small-world" network characteristics in functional networks by acupuncture. These preliminary results highlight the beneficial modulations of functional connectivity by manual acupuncture, which could contribute to the understanding of acupuncture effects on the entire brain, as well as the neurophysiological mechanisms underlying acupuncture. Moreover, the proposed method may be a useful approach to the further investigation of the complexity of patterns of interrelations between EEG channels.     

The modulation of brain functional connectivity with manual acupuncture in healthy subjects:An electroencephalograph case study

Manual acupuncture is widely used for pain relief and stress control.Previous studies on acupuncture have shown its modulatory effects on the functional connectivity associated with one or a few preselected brain regions.To investigate how manual acupuncture modulates the organization of functional networks at a whole-brain level,we acupuncture at ST36 of a right leg to obtain electroencephalograph(EEG) signals.By coherence estimation,we determine the synchronizations between all pairwise combinations of EEG channels in three acupuncture states.The resulting synchronization matrices are converted into functional networks by applying a threshold,and the clustering coefficients and path lengths are computed as a function of threshold.The results show that acupuncture can increase functional connections and synchronizations between different brain areas.For a wide range of thresholds,the clustering coefficient during acupuncture and postacupuncture period is higher than that during the pre-acupuncture control period,whereas the characteristic path length is shorter.We provide further support for the presence of "small-world" network characteristics in functional networks by using acupuncture.These preliminary results highlight the beneficial modulations of functional connectivity by manual acupuncture,which could contribute to the understanding of the effects of acupuncture on the entire brain,as well as the neurophysiological mechanisms underlying acupuncture.Moreover,the proposed method may be a useful approach to the further investigation of the complexity of patterns of interrelations between EEG channels.     

Negative capacitance in doped bi-layer organic light-emitting devices

This paper reports that the doped bi-layer organic light-emitting devices are fabricated by doping in different regions of the light-emitting layer,the admittance and luminance spectra to characterize the capacitance and luminance of the device are measured.Negative capacitance (NC) appeared at low frequencies when the doped devices are biased with high voltages.The measured phase difference between AC voltage applied across the device and AC current flowing through the device show that the device is inductive when NC appears.     

龙葵Atrazine抗性基因向大豆叶绿体的转移及在转基因植株中的表达

本文将龙葵Atrazine抗性psbA基因采用合子期子房微注射法,导入对Atrazine敏感的大豆叶绿体基因组中,经直接用Atrazine涂抹叶片及叶片在较强光诱导下荧光动力学研究和间接分子杂交试验等检测方法鉴定,表明本项研究首次获得了转基因大豆植株。     

二维MXene材料的制备与电化学储能应用

将MAX相陶瓷通过液相刻蚀等方法移除A原子层可得到与石墨烯（Graphene）类似二维结构的过渡金属碳或氮化物（MXene）,是近年来二维材料领域出现的新成员。独特的二维结构与丰富可调的组分使得MXene具有优异的导电与机械性能、高亲水表面与离子传输性能,受到越来越广泛的关注。目前已成功制备出的MXene材料有20余种,研究发现MXene应用于锂离子、非锂离子（如Na⁺、K⁺、Mg²⁺、Ca²⁺和Al³⁺）二次电池和电化学超级电容器均表现出优异的性能,是一种很有潜力的电极材料。本文总结对比了MXene材料制备方法,简要概述了MXene材料的电子、电磁与机械性能,重点介绍了MXene在电化学电池与超级电容器储能方面的应用,最后对MXene材料目前存在的主要问题及未来研究与应用前景进行了展望。