CRISPR/Cas9基因编辑技术已经成功应用于多种植物基因组的编辑,但是在生菜中鲜有报道。本研究拟在生菜(Lactuca sati va L.)中建立CRISPR/Cas9基因编辑体系。首先根据生菜FANCM基因序列设计靶位点,构建Lsfancm-CRISPR/Cas9载体。然后以...CRISPR/Cas9基因编辑技术已经成功应用于多种植物基因组的编辑,但是在生菜中鲜有报道。本研究拟在生菜(Lactuca sati va L.)中建立CRISPR/Cas9基因编辑体系。首先根据生菜FANCM基因序列设计靶位点,构建Lsfancm-CRISPR/Cas9载体。然后以生菜子叶作为外植体,通过农杆菌侵染、共培养、愈伤组织诱导、芽再生及生根培养等过程,对生菜进行农杆菌介导的遗传转化,共获得24株T_0代转基因阳性植株。进一步对靶位点序列进行PCR并测序分析,发现4株转基因生菜的靶位点发生基因编辑,产生fancm杂合突变体,并且在T_1代植株中鉴定到纯合突变体。以上结果表明,本研究已成功将CRISPR/Cas9基因编辑体系有效地运用于生菜中,该体系的建立可为将来生菜的基因功能研究及分子育种提供重要的技术参考。展开更多
Magnetic impurities in superconductors are of increasing interest due to emergent Yu-Shiba-Rusinov(YSR)states and Majorana zero modes for fault-tolerant quantum computation.However,a direct relationship between the YS...Magnetic impurities in superconductors are of increasing interest due to emergent Yu-Shiba-Rusinov(YSR)states and Majorana zero modes for fault-tolerant quantum computation.However,a direct relationship between the YSR multiple states and magnetic anisotropy splitting of quantum impurity spins remains poorly characterized.By using scanning tunneling microscopy,we systematically resolve individual transition-metal(Fe,Cr,and Ni)impurities induced YSR multiplets as well as their Zeeman effects in the K_(3)C_(60)superconductor.The YSR multiplets show identical d orbital-like wave functions that are symmetry-mismatched to the threefold K_(3)C_(60)(111)host surface,breaking point-group symmetries of the spatial distribution of YSR bound states in real space.Remarkably,we identify an unprecedented fermion-parity-preserving quantum phase transition between ground states with opposite signs of the uniaxial magnetic anisotropy that can be manipulated by an external magnetic field.These findings can be readily understood in terms of anisotropy splitting of quantum impurity spins,and thus elucidate the intricate interplay between the magnetic anisotropy and YSR multiplets.展开更多
The spin-transfer-torque(STT)magnetic tunneling junction(MTJ)device is one of the prominent candidates for spintronic logic circuit and neuromorphic computing.Therefore,building a simulation framework of hybrid STT-MT...The spin-transfer-torque(STT)magnetic tunneling junction(MTJ)device is one of the prominent candidates for spintronic logic circuit and neuromorphic computing.Therefore,building a simulation framework of hybrid STT-MTJ/CMOS(complementary metal-oxide-semiconductor)circuits is of great value for designing a new kind of computing paradigm based on the spintronic devices.In this work,we develop a simulation framework of hybrid STT-MTJ/CMOS circuits based on MATLAB/Simulink,which is mainly composed of a physics-based STT-MTJ model,a controlled resistor,and a current sensor.In the proposed framework,the STT-MTJ model,based on the Landau-Lifshitz-Gilbert-Slonczewsk(LLGS)equation,is implemented using the MATLAB script.The proposed simulation framework is modularized design,with the advantage of simple-to-use and easy-to-expand.To prove the effectiveness of the proposed framework,the STT-MTJ model is benchmarked with experimental results.Furthermore,the pre-charge sense amplifier(PCSA)circuit consisting of two STT-MTJ devices is validated and the electrical coupling of two spin-torque oscillators is simulated.The results demonstrate the effectiveness of our simulation framework.展开更多
文摘CRISPR/Cas9基因编辑技术已经成功应用于多种植物基因组的编辑,但是在生菜中鲜有报道。本研究拟在生菜(Lactuca sati va L.)中建立CRISPR/Cas9基因编辑体系。首先根据生菜FANCM基因序列设计靶位点,构建Lsfancm-CRISPR/Cas9载体。然后以生菜子叶作为外植体,通过农杆菌侵染、共培养、愈伤组织诱导、芽再生及生根培养等过程,对生菜进行农杆菌介导的遗传转化,共获得24株T_0代转基因阳性植株。进一步对靶位点序列进行PCR并测序分析,发现4株转基因生菜的靶位点发生基因编辑,产生fancm杂合突变体,并且在T_1代植株中鉴定到纯合突变体。以上结果表明,本研究已成功将CRISPR/Cas9基因编辑体系有效地运用于生菜中,该体系的建立可为将来生菜的基因功能研究及分子育种提供重要的技术参考。
基金financially supported by the National Key Research and Development Program of China(2022YFA1403100,2017YFA0304600)the National Natural Science Foundation of China(12141403,52388201)+1 种基金the Suzhou Science and Technology Program(SJC2021009)Nano-X from the Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),the Chinese Academy of Sciences.
文摘Magnetic impurities in superconductors are of increasing interest due to emergent Yu-Shiba-Rusinov(YSR)states and Majorana zero modes for fault-tolerant quantum computation.However,a direct relationship between the YSR multiple states and magnetic anisotropy splitting of quantum impurity spins remains poorly characterized.By using scanning tunneling microscopy,we systematically resolve individual transition-metal(Fe,Cr,and Ni)impurities induced YSR multiplets as well as their Zeeman effects in the K_(3)C_(60)superconductor.The YSR multiplets show identical d orbital-like wave functions that are symmetry-mismatched to the threefold K_(3)C_(60)(111)host surface,breaking point-group symmetries of the spatial distribution of YSR bound states in real space.Remarkably,we identify an unprecedented fermion-parity-preserving quantum phase transition between ground states with opposite signs of the uniaxial magnetic anisotropy that can be manipulated by an external magnetic field.These findings can be readily understood in terms of anisotropy splitting of quantum impurity spins,and thus elucidate the intricate interplay between the magnetic anisotropy and YSR multiplets.
基金supported by the National Key Research and Development Program of China(2018YFA0306800,2021YFA1400400,2018YFA0306200,and 2021YFA1202901)the National Natural Science Foundation of China(92165205,11790311,12004172,51861145201,52072168,21733001,and 91750101)+2 种基金the Innovation Program for Quantum Science and Technology for China(2021ZD0302803)the Jiangsu Planned Projects for Postdoctoral Research Funds(2020Z172)the Program of High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province,China。
基金Project supported by the National Natural Science Foundation of China(Grant No.62004223)the Science and Technology Innovation Program of Hunan Province,China(Grant No.2022RC1094)+1 种基金the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics,China(Grant No.KF202012)the Hunan Provincial Science Innovation Project for Postgraduate,China(Grant No.CX20210086).
文摘The spin-transfer-torque(STT)magnetic tunneling junction(MTJ)device is one of the prominent candidates for spintronic logic circuit and neuromorphic computing.Therefore,building a simulation framework of hybrid STT-MTJ/CMOS(complementary metal-oxide-semiconductor)circuits is of great value for designing a new kind of computing paradigm based on the spintronic devices.In this work,we develop a simulation framework of hybrid STT-MTJ/CMOS circuits based on MATLAB/Simulink,which is mainly composed of a physics-based STT-MTJ model,a controlled resistor,and a current sensor.In the proposed framework,the STT-MTJ model,based on the Landau-Lifshitz-Gilbert-Slonczewsk(LLGS)equation,is implemented using the MATLAB script.The proposed simulation framework is modularized design,with the advantage of simple-to-use and easy-to-expand.To prove the effectiveness of the proposed framework,the STT-MTJ model is benchmarked with experimental results.Furthermore,the pre-charge sense amplifier(PCSA)circuit consisting of two STT-MTJ devices is validated and the electrical coupling of two spin-torque oscillators is simulated.The results demonstrate the effectiveness of our simulation framework.
