Lipoxygenase(LOXs)is a kind of dioxygenase without heme and iron,which plays an important role in the development and adaptation of many plants to the environment.However,the study of strawberry LOX gene family has no...Lipoxygenase(LOXs)is a kind of dioxygenase without heme and iron,which plays an important role in the development and adaptation of many plants to the environment.However,the study of strawberry LOX gene family has not been reported.In this study,14 LOX genes were identified from the diploid woodland strawberry genome.The phylogenetic tree divides the FvLOX gene into two subfamilies:9-LOX and 13-LOX.Gene duplication event analysis showed that whole-genome duplication(WGD)/segmental duplication and dispersed duplication effectively promoted the expansion of strawberry LOX family.QRT-PCR analysis showed that FvLOX genes were expressed in different tissues.Expression profile analysis showed that FvLOX1 and FvLOX8 were up-regulated under low temperature stress,FvLOX3 and FvLOX7 were up-regulated under drought stress,FvLOX6 and FvLOX9 were up-regulated under salt stress,FvLOX2,FvLOX3 and FvLOX6 were up-regulated under salicylic acid(SA)treatment,FvLOX3,FvLOX11 and FvLOX14 were up-regulated under methyl jasmonate(MeJA)treatment,FvLOX4 and FvLOX14 were up-regulated under abscisic acid(ABA)treatment.Promoter analysis showed that FvLOX genes were involved in plant growth and development and stress response.We analyzed and identified the whole genome of strawberry FvLOX family and characterized a variety of FvLOX candidate genes involved in abiotic stress response.This study laid a theoretical and empirical foundation for the response mechanism of strawberry to abiotic stress.展开更多
在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处...在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处理中采用边沿处理技术,能有效地抑制量化误差。实验表明,在10 bit A/D采样分辨率下,测量分辨率较原有A/D测量分辨率提高了一个数量级甚至更高。该方法可以在频率、相位等参数的精密测量、控制中发挥重要作用。展开更多
随着电动汽车和大规模储能电网的快速发展,锂离子电池将不可避免地面临有限的能量密度无法满足日益增长的需求和成本不断上升的两大困境。室温钠-硫电池因具有高能量密度和低成本的优势而备受关注,但其存在多硫化钠的“穿梭效应”导致...随着电动汽车和大规模储能电网的快速发展,锂离子电池将不可避免地面临有限的能量密度无法满足日益增长的需求和成本不断上升的两大困境。室温钠-硫电池因具有高能量密度和低成本的优势而备受关注,但其存在多硫化钠的“穿梭效应”导致电池的循环性能较差的问题,亟需解决。在此,本文提出将纳米TiO_(2)颗粒构筑于多通道炭纤维以稳定硫,从而实现室温钠-硫电池电化学性能的提高。首先通过静电纺丝和热处理技术制得有纳米TiO_(2)负载的多通道炭纤维载体材料,后续采用熔融扩散载硫方法制备出硫基复合正极材料。纳米TiO_(2)颗粒的加入可增强了对多硫化物的吸附力,同时促进其向Na2S2和Na2S的快速转化。在0.1 A g^(−1)电流密度条件下,电极材料经循环100次后的比容量为445.1 mAh g^(−1),库仑效率接近100%;即使在电流密度为2 A g^(−1)时,经500次循环,该电极材料仍保持有300.5 mAh g^(−1)的容量,显现出优异的倍率和循环性能。通过表征测试手段与理论计算相结合,验证了纳米TiO_(2)颗粒的加入可增强碳基材料对多硫化物的吸附作用。这项工作有望为高性能室温钠-硫电池正极材料的优化设计提供理论依据与技术指导。展开更多
基金supported by the Science and Technology Innovation Fund of Fujian Agriculture and Forestry University(KHF200005)。
文摘Lipoxygenase(LOXs)is a kind of dioxygenase without heme and iron,which plays an important role in the development and adaptation of many plants to the environment.However,the study of strawberry LOX gene family has not been reported.In this study,14 LOX genes were identified from the diploid woodland strawberry genome.The phylogenetic tree divides the FvLOX gene into two subfamilies:9-LOX and 13-LOX.Gene duplication event analysis showed that whole-genome duplication(WGD)/segmental duplication and dispersed duplication effectively promoted the expansion of strawberry LOX family.QRT-PCR analysis showed that FvLOX genes were expressed in different tissues.Expression profile analysis showed that FvLOX1 and FvLOX8 were up-regulated under low temperature stress,FvLOX3 and FvLOX7 were up-regulated under drought stress,FvLOX6 and FvLOX9 were up-regulated under salt stress,FvLOX2,FvLOX3 and FvLOX6 were up-regulated under salicylic acid(SA)treatment,FvLOX3,FvLOX11 and FvLOX14 were up-regulated under methyl jasmonate(MeJA)treatment,FvLOX4 and FvLOX14 were up-regulated under abscisic acid(ABA)treatment.Promoter analysis showed that FvLOX genes were involved in plant growth and development and stress response.We analyzed and identified the whole genome of strawberry FvLOX family and characterized a variety of FvLOX candidate genes involved in abiotic stress response.This study laid a theoretical and empirical foundation for the response mechanism of strawberry to abiotic stress.
文摘在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处理中采用边沿处理技术,能有效地抑制量化误差。实验表明,在10 bit A/D采样分辨率下,测量分辨率较原有A/D测量分辨率提高了一个数量级甚至更高。该方法可以在频率、相位等参数的精密测量、控制中发挥重要作用。
文摘随着电动汽车和大规模储能电网的快速发展,锂离子电池将不可避免地面临有限的能量密度无法满足日益增长的需求和成本不断上升的两大困境。室温钠-硫电池因具有高能量密度和低成本的优势而备受关注,但其存在多硫化钠的“穿梭效应”导致电池的循环性能较差的问题,亟需解决。在此,本文提出将纳米TiO_(2)颗粒构筑于多通道炭纤维以稳定硫,从而实现室温钠-硫电池电化学性能的提高。首先通过静电纺丝和热处理技术制得有纳米TiO_(2)负载的多通道炭纤维载体材料,后续采用熔融扩散载硫方法制备出硫基复合正极材料。纳米TiO_(2)颗粒的加入可增强了对多硫化物的吸附力,同时促进其向Na2S2和Na2S的快速转化。在0.1 A g^(−1)电流密度条件下,电极材料经循环100次后的比容量为445.1 mAh g^(−1),库仑效率接近100%;即使在电流密度为2 A g^(−1)时,经500次循环,该电极材料仍保持有300.5 mAh g^(−1)的容量,显现出优异的倍率和循环性能。通过表征测试手段与理论计算相结合,验证了纳米TiO_(2)颗粒的加入可增强碳基材料对多硫化物的吸附作用。这项工作有望为高性能室温钠-硫电池正极材料的优化设计提供理论依据与技术指导。
