为筛选适于甘草愈伤组织诱导及带芽茎段丛生芽增殖的最佳激素配比,选取萌发能力最强的甘草种子作为试验材料,获得无菌苗,取其下胚轴和带芽茎段为外植体,在不同激素配比下诱导愈伤组织,统计愈伤组织的生长状况、颜色状态、诱导率和出愈...为筛选适于甘草愈伤组织诱导及带芽茎段丛生芽增殖的最佳激素配比,选取萌发能力最强的甘草种子作为试验材料,获得无菌苗,取其下胚轴和带芽茎段为外植体,在不同激素配比下诱导愈伤组织,统计愈伤组织的生长状况、颜色状态、诱导率和出愈率等指标,并研究不同激素对甘草带芽茎段丛生芽增殖的影响,统计带芽茎段丛生芽株高、节间距、真叶数、增殖倍数等指标。结果表明:MS+6 BA 1.0 mg·L^(-1)+2,4 D 2.0 mg·L^(-1)和MS+6 BA 1.0 mg·L^(-1)+NAA 2.0 mg·L^(-1)有利于下胚轴愈伤组织的诱导,MS+6 BA 0.2~0.6 mg·L^(-1)有利于带芽茎段愈伤组织的形成;MS+6 BA 1.8 mg·L^(-1)对带芽茎段的生长最为有利,MS+6 BA 1.0~2.2 mg·L^(-1)有利于带芽茎段丛生芽的增殖,随着6 BA浓度的升高,甘草带芽茎段丛生芽的增殖倍数也随之增加。展开更多
A simultaneous self-Q-switched and mode-locked laser in a direct 885nm diode-pumped Cr,Nd:YAG crystal is demonstrated.An improvement of the slope efficiency (38.1%) in the absorbed pump power is obtained under direct ...A simultaneous self-Q-switched and mode-locked laser in a direct 885nm diode-pumped Cr,Nd:YAG crystal is demonstrated.An improvement of the slope efficiency (38.1%) in the absorbed pump power is obtained under direct pumping.Under the maximum output power of 3.36 W,the repetition rate of the Q-switched envelopes is 95 kHz and the corresponding pulse width is 400 ns.Almost 100% mode-locked modulation depth is observed at the output power of 75 m W.The repetition rate of mode-locked pulses within a Q-switched envelope is 130 MHz,and the mode-locked pulse width stays within the scale of 500ps.展开更多
CaCu _(3)Ti_(4)O_(12)(CCTO)thin films were fabricated on ITO−covered MgO(100)substrates.The rectification characteristics were observed in the CCTO capacitance structure with Pt top electrodes at temperatures ranging ...CaCu _(3)Ti_(4)O_(12)(CCTO)thin films were fabricated on ITO−covered MgO(100)substrates.The rectification characteristics were observed in the CCTO capacitance structure with Pt top electrodes at temperatures ranging from 150 K to 330 K,which are attributed to the formation of a Schottky junction between n-type semiconducting CCTO and Pt due to the difference of their work functions.At low forward-bias voltage,the current-voltage characteristics of the Schottky junction follow J=JsD exp[qV/(k0T)].A strong decrease in ideality factor with the increasing temperature is obtained by linear fitting at the low bias voltage.展开更多
文摘为筛选适于甘草愈伤组织诱导及带芽茎段丛生芽增殖的最佳激素配比,选取萌发能力最强的甘草种子作为试验材料,获得无菌苗,取其下胚轴和带芽茎段为外植体,在不同激素配比下诱导愈伤组织,统计愈伤组织的生长状况、颜色状态、诱导率和出愈率等指标,并研究不同激素对甘草带芽茎段丛生芽增殖的影响,统计带芽茎段丛生芽株高、节间距、真叶数、增殖倍数等指标。结果表明:MS+6 BA 1.0 mg·L^(-1)+2,4 D 2.0 mg·L^(-1)和MS+6 BA 1.0 mg·L^(-1)+NAA 2.0 mg·L^(-1)有利于下胚轴愈伤组织的诱导,MS+6 BA 0.2~0.6 mg·L^(-1)有利于带芽茎段愈伤组织的形成;MS+6 BA 1.8 mg·L^(-1)对带芽茎段的生长最为有利,MS+6 BA 1.0~2.2 mg·L^(-1)有利于带芽茎段丛生芽的增殖,随着6 BA浓度的升高,甘草带芽茎段丛生芽的增殖倍数也随之增加。
基金Supported by the National Natural Science Foundation of China under Grant No 61078005the National Basic Research Program of China(2007CB613205).
文摘A simultaneous self-Q-switched and mode-locked laser in a direct 885nm diode-pumped Cr,Nd:YAG crystal is demonstrated.An improvement of the slope efficiency (38.1%) in the absorbed pump power is obtained under direct pumping.Under the maximum output power of 3.36 W,the repetition rate of the Q-switched envelopes is 95 kHz and the corresponding pulse width is 400 ns.Almost 100% mode-locked modulation depth is observed at the output power of 75 m W.The repetition rate of mode-locked pulses within a Q-switched envelope is 130 MHz,and the mode-locked pulse width stays within the scale of 500ps.
基金by the National Key Basic Research Program of China under Grant No 2011CB301802.
文摘CaCu _(3)Ti_(4)O_(12)(CCTO)thin films were fabricated on ITO−covered MgO(100)substrates.The rectification characteristics were observed in the CCTO capacitance structure with Pt top electrodes at temperatures ranging from 150 K to 330 K,which are attributed to the formation of a Schottky junction between n-type semiconducting CCTO and Pt due to the difference of their work functions.At low forward-bias voltage,the current-voltage characteristics of the Schottky junction follow J=JsD exp[qV/(k0T)].A strong decrease in ideality factor with the increasing temperature is obtained by linear fitting at the low bias voltage.
