A reliable in vitro regeneration procedure for Populus tomentosa is a prerequisite for its trait improvement through genetic transformation. We established a systematic protocol for indirect regeneration of P. tomento...A reliable in vitro regeneration procedure for Populus tomentosa is a prerequisite for its trait improvement through genetic transformation. We established a systematic protocol for indirect regeneration of P. tomentosa using in vitro petioles of Chinese poplar cultivar ＇fasta-3＇. A high frequency of callus induction （〉97 %） was obtained from isolated petioles cultured on the modified 1/2MS basal medium supplemented with 0.5 mg/L ZT and 1.0 mg/L NAA, and the tested calli were subsequently plated on 1/2MS basal medium supplemented with 0.25 mg/L BA, 0.25 mg/L ZT, 0.25 mg/L NAA, 0.01 mg/L TDZ, and 0.5 mg/L KT for efficient regeneration of shoots after being cultured for 6 weeks. The regenerated shoots were vigorously rooted on the tested media supplemented with 1.0 mg/ L IBA and 0.5 mg/L NAA. These results can facilitate genetic transformation of P. tomentosa for trait improvements in future.展开更多
针对电机故障诊断的特点,提出一种基于遗传神经网络(BP)进行异步电机故障检测的新方法。针对神经网络易陷入局部最小点的固有缺点,采用遗传算法(Genetic A lgorithm,简称GA)对神经网络初始权值进行全局优化。实践证明该方法可以有效地...针对电机故障诊断的特点,提出一种基于遗传神经网络(BP)进行异步电机故障检测的新方法。针对神经网络易陷入局部最小点的固有缺点,采用遗传算法(Genetic A lgorithm,简称GA)对神经网络初始权值进行全局优化。实践证明该方法可以有效地实现对异步电机的故障诊断,且易于实现,有一定实用价值。展开更多
文摘A reliable in vitro regeneration procedure for Populus tomentosa is a prerequisite for its trait improvement through genetic transformation. We established a systematic protocol for indirect regeneration of P. tomentosa using in vitro petioles of Chinese poplar cultivar ＇fasta-3＇. A high frequency of callus induction （〉97 %） was obtained from isolated petioles cultured on the modified 1/2MS basal medium supplemented with 0.5 mg/L ZT and 1.0 mg/L NAA, and the tested calli were subsequently plated on 1/2MS basal medium supplemented with 0.25 mg/L BA, 0.25 mg/L ZT, 0.25 mg/L NAA, 0.01 mg/L TDZ, and 0.5 mg/L KT for efficient regeneration of shoots after being cultured for 6 weeks. The regenerated shoots were vigorously rooted on the tested media supplemented with 1.0 mg/ L IBA and 0.5 mg/L NAA. These results can facilitate genetic transformation of P. tomentosa for trait improvements in future.
文摘针对电机故障诊断的特点,提出一种基于遗传神经网络(BP)进行异步电机故障检测的新方法。针对神经网络易陷入局部最小点的固有缺点,采用遗传算法(Genetic A lgorithm,简称GA)对神经网络初始权值进行全局优化。实践证明该方法可以有效地实现对异步电机的故障诊断,且易于实现,有一定实用价值。
