Plant Homeo Domain(PHD)proteins are involved in diverse biological processes during plant growth.However,the regulation of PHD genes on rice cold stress response remains largely unknown.Here,we reported that PHD17 neg...Plant Homeo Domain(PHD)proteins are involved in diverse biological processes during plant growth.However,the regulation of PHD genes on rice cold stress response remains largely unknown.Here,we reported that PHD17 negatively regulated cold tolerance in rice seedlings as a cleavage target of miR1320.PHD17 expression was greatly induced by cold stress,and was down-regulated by miR1320 overexpression and up-regulated by miR1320 knockdown.Through 5'RACE and dual luciferase assays,we found that miR1320 targeted and cleaved the 3'UTR region of PHD17.PHD17 was a nuclearlocalized protein and acted as a transcriptional activator in yeast.PHD17 overexpression reduced cold tolerance of rice seedlings,while knockout of PHD17 increased cold tolerance,partially via the CBF cold signaling.By combining transcriptomic and physiological analyses,we demonstrated that PHD17 modulated ROS homeostasis and flavonoid accumulation under cold stress.K-means clustering analysis revealed that differentially expressed genes in PHD17 transgenic lines were significantly enriched in the jasmonic acid(JA)biosynthesis pathway,and expression of JA biosynthesis and signaling genes was verified to be affected by PHD17.Cold stress tests applied with MeJA or IBU(JA synthesis inhibitor)further suggested the involvement of PHD17 in JA-mediated cold signaling.Taken together,our results suggest that PHD17 acts downstream of miR1320 and negatively regulates cold tolerance of rice seedlings through JA-mediated signaling pathway.展开更多
An algorithm to track multiple sharply maneuvering targets without prior knowledge about new target birth is proposed. These targets are capable of achieving sharp maneuvers within a short period of time, such as dron...An algorithm to track multiple sharply maneuvering targets without prior knowledge about new target birth is proposed. These targets are capable of achieving sharp maneuvers within a short period of time, such as drones and agile missiles.The probability hypothesis density (PHD) filter, which propagates only the first-order statistical moment of the full target posterior, has been shown to be a computationally efficient solution to multitarget tracking problems. However, the standard PHD filter operates on the single dynamic model and requires prior information about target birth distribution, which leads to many limitations in terms of practical applications. In this paper,we introduce a nonzero mean, white noise turn rate dynamic model and generalize jump Markov systems to multitarget case to accommodate sharply maneuvering dynamics. Moreover, to adaptively estimate newborn targets’information, a measurement-driven method based on the recursive random sampling consensus (RANSAC) algorithm is proposed. Simulation results demonstrate that the proposed method achieves significant improvement in tracking multiple sharply maneuvering targets with adaptive birth estimation.展开更多
IEEE IPDPS（IEEE International Parallel＆Distributed Processing Symposium）为并行与分布式计算领域的顶级国际会议。IPDPS2012将于明年5月21日至25日在上海召开。该会议将包括以下组成部分：IPDPS主会议，附属研讨会（约10个），...IEEE IPDPS（IEEE International Parallel＆Distributed Processing Symposium）为并行与分布式计算领域的顶级国际会议。IPDPS2012将于明年5月21日至25日在上海召开。该会议将包括以下组成部分：IPDPS主会议，附属研讨会（约10个），特邀演讲，半日短课程，博士生论坛。IPDPS主会信息已在http：／／www．ipdps．org发布，IPDPS博士生论坛信息的英文版则发布在http：／／www．ipdps．org／ipdps2012／2012_phd_forum．html上。IPDPS博士生论坛副主席：Dr．LucBouge,ENS Cachan，France；Dr．Bo Hong．Georgia Institute of Technology,USA。展开更多
考虑到存活目标与新生目标在动态演化特性上的差异性,提出了面向快速多目标跟踪的协同概率假设密度(collaborative probability hypothesis density,CoPHD)滤波框架。该框架利用存活目标的状态信息,将量测动态划分为存活目标量测集与新...考虑到存活目标与新生目标在动态演化特性上的差异性,提出了面向快速多目标跟踪的协同概率假设密度(collaborative probability hypothesis density,CoPHD)滤波框架。该框架利用存活目标的状态信息,将量测动态划分为存活目标量测集与新生目标量测集,在两个量测集分别运用PHD组处理更新基础上建立了处理模块的交互与协同机制,力图在保证跟踪精度的同时提高计算效率。该框架由于采用PHD组处理方式而具有状态自动提取功能。进一步给出了该框架的序贯蒙特卡罗算法实现。仿真结果表明,该算法在计算效率以及状态提取精度上具有明显优势。展开更多
目的探讨下调泛素样含PHD和环指域1(ubiquitin-like protein containing PHD and RING finger domains 1,UHRF1)基因在喉癌Hep-2细胞中的表达后对其增殖,凋亡,侵袭迁移能力的影响。方法实验分为空白组,阴性对照组和干扰组。利用UHRF1-si...目的探讨下调泛素样含PHD和环指域1(ubiquitin-like protein containing PHD and RING finger domains 1,UHRF1)基因在喉癌Hep-2细胞中的表达后对其增殖,凋亡,侵袭迁移能力的影响。方法实验分为空白组,阴性对照组和干扰组。利用UHRF1-si RNA干扰UHRF1在喉癌Hep-2细胞中的表达,采用q RT-PCR、Western blot检测UHRF1的表达变化。采用MTT法、流式细胞术、Transwell实验检测下调UHRF1表达后Hep-2细胞的增殖、凋亡、侵袭、迁移能力的变化。Western blot检测下调UHRF1表达后Hep-2细胞内Bax、Bcl-2、MMP-2、MMP-9蛋白表达的变化情况。结果与空白组和阴性对照组相比干扰组下调UHRF1的表达后可明显抑制喉癌Hep-2细胞的增殖能力(P<0.001)。空白组,阴性对照组,干扰组凋亡率分别为(5.47±2.77)%,(3.95±0.66)%,(18.95±1.10)%,干扰组凋亡率明显提高(P<0.001)。空白组,阴性对照,干扰组每视野侵袭细胞数分别为(213.7±13.1),(221.3±10.3),(97.7±7.5),干扰组侵袭细胞数明显降低(P<0.001)。空白组,阴性对照,干扰组每视野迁移细胞数分别为(230.7±5.5),(222.7±11.2),(111.7±7.6),干扰组迁移细胞数明显降低(P<0.001)。干扰组细胞Bax蛋白表达上调(P<0.001),Bcl-2蛋白表达下调(P<0.001),MMP-2蛋白、MMP-9蛋白表达下调(P<0.001)。结论在喉癌Hep-2细胞中下调UHRF1的表达后可明显抑制细胞的增殖,促进细胞凋亡,抑制细胞的侵袭迁移能力。展开更多
基金supported by the National Natural Science Foundation of China (31971826,U20A2025)Natural Science Foundation of Heilongjiang province (JQ2021C002)the College Student Innovation and Entrepreneurship Program Training Program (202210223055)。
文摘Plant Homeo Domain(PHD)proteins are involved in diverse biological processes during plant growth.However,the regulation of PHD genes on rice cold stress response remains largely unknown.Here,we reported that PHD17 negatively regulated cold tolerance in rice seedlings as a cleavage target of miR1320.PHD17 expression was greatly induced by cold stress,and was down-regulated by miR1320 overexpression and up-regulated by miR1320 knockdown.Through 5'RACE and dual luciferase assays,we found that miR1320 targeted and cleaved the 3'UTR region of PHD17.PHD17 was a nuclearlocalized protein and acted as a transcriptional activator in yeast.PHD17 overexpression reduced cold tolerance of rice seedlings,while knockout of PHD17 increased cold tolerance,partially via the CBF cold signaling.By combining transcriptomic and physiological analyses,we demonstrated that PHD17 modulated ROS homeostasis and flavonoid accumulation under cold stress.K-means clustering analysis revealed that differentially expressed genes in PHD17 transgenic lines were significantly enriched in the jasmonic acid(JA)biosynthesis pathway,and expression of JA biosynthesis and signaling genes was verified to be affected by PHD17.Cold stress tests applied with MeJA or IBU(JA synthesis inhibitor)further suggested the involvement of PHD17 in JA-mediated cold signaling.Taken together,our results suggest that PHD17 acts downstream of miR1320 and negatively regulates cold tolerance of rice seedlings through JA-mediated signaling pathway.
基金supported by the National Natural Science Foundation of China (61773142)。
文摘An algorithm to track multiple sharply maneuvering targets without prior knowledge about new target birth is proposed. These targets are capable of achieving sharp maneuvers within a short period of time, such as drones and agile missiles.The probability hypothesis density (PHD) filter, which propagates only the first-order statistical moment of the full target posterior, has been shown to be a computationally efficient solution to multitarget tracking problems. However, the standard PHD filter operates on the single dynamic model and requires prior information about target birth distribution, which leads to many limitations in terms of practical applications. In this paper,we introduce a nonzero mean, white noise turn rate dynamic model and generalize jump Markov systems to multitarget case to accommodate sharply maneuvering dynamics. Moreover, to adaptively estimate newborn targets’information, a measurement-driven method based on the recursive random sampling consensus (RANSAC) algorithm is proposed. Simulation results demonstrate that the proposed method achieves significant improvement in tracking multiple sharply maneuvering targets with adaptive birth estimation.
文摘IEEE IPDPS（IEEE International Parallel＆Distributed Processing Symposium）为并行与分布式计算领域的顶级国际会议。IPDPS2012将于明年5月21日至25日在上海召开。该会议将包括以下组成部分：IPDPS主会议，附属研讨会（约10个），特邀演讲，半日短课程，博士生论坛。IPDPS主会信息已在http：／／www．ipdps．org发布，IPDPS博士生论坛信息的英文版则发布在http：／／www．ipdps．org／ipdps2012／2012_phd_forum．html上。IPDPS博士生论坛副主席：Dr．LucBouge,ENS Cachan，France；Dr．Bo Hong．Georgia Institute of Technology,USA。
文摘考虑到存活目标与新生目标在动态演化特性上的差异性,提出了面向快速多目标跟踪的协同概率假设密度(collaborative probability hypothesis density,CoPHD)滤波框架。该框架利用存活目标的状态信息,将量测动态划分为存活目标量测集与新生目标量测集,在两个量测集分别运用PHD组处理更新基础上建立了处理模块的交互与协同机制,力图在保证跟踪精度的同时提高计算效率。该框架由于采用PHD组处理方式而具有状态自动提取功能。进一步给出了该框架的序贯蒙特卡罗算法实现。仿真结果表明,该算法在计算效率以及状态提取精度上具有明显优势。
文摘目的探讨下调泛素样含PHD和环指域1(ubiquitin-like protein containing PHD and RING finger domains 1,UHRF1)基因在喉癌Hep-2细胞中的表达后对其增殖,凋亡,侵袭迁移能力的影响。方法实验分为空白组,阴性对照组和干扰组。利用UHRF1-si RNA干扰UHRF1在喉癌Hep-2细胞中的表达,采用q RT-PCR、Western blot检测UHRF1的表达变化。采用MTT法、流式细胞术、Transwell实验检测下调UHRF1表达后Hep-2细胞的增殖、凋亡、侵袭、迁移能力的变化。Western blot检测下调UHRF1表达后Hep-2细胞内Bax、Bcl-2、MMP-2、MMP-9蛋白表达的变化情况。结果与空白组和阴性对照组相比干扰组下调UHRF1的表达后可明显抑制喉癌Hep-2细胞的增殖能力(P<0.001)。空白组,阴性对照组,干扰组凋亡率分别为(5.47±2.77)%,(3.95±0.66)%,(18.95±1.10)%,干扰组凋亡率明显提高(P<0.001)。空白组,阴性对照,干扰组每视野侵袭细胞数分别为(213.7±13.1),(221.3±10.3),(97.7±7.5),干扰组侵袭细胞数明显降低(P<0.001)。空白组,阴性对照,干扰组每视野迁移细胞数分别为(230.7±5.5),(222.7±11.2),(111.7±7.6),干扰组迁移细胞数明显降低(P<0.001)。干扰组细胞Bax蛋白表达上调(P<0.001),Bcl-2蛋白表达下调(P<0.001),MMP-2蛋白、MMP-9蛋白表达下调(P<0.001)。结论在喉癌Hep-2细胞中下调UHRF1的表达后可明显抑制细胞的增殖,促进细胞凋亡,抑制细胞的侵袭迁移能力。
