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Hormones and carbohydrates synergistically regulate the formation of swollen roots in a Chinese cabbage translocation line

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Horticulture Research 2023年第8期10卷 44-58页

作者： Xiaojing Ren Wei Ma Shuxin xuan Dandan Li Yanhua Wang yuanchao xu Daling Feng Jianjun Zhao xueping Chen Shuangxia Luo Shuxing Shen Aixia Gu State Key Laboratory of North China Crop Improvement and Regulation Key Laboratory of Vegetable Germplasm Innovation and Utilization of HebeiCollaborative Innovation Center of Vegetable Industry in HebeiCollege of HorticultureHebei Agricultural University071000 BaodingChina

The genus Brassica contains a rich diversity of species and morphological types,including leaf,root,and oil crops,all of which show substantial phenotypic *** Chinese cabbage and cabbage are typical leaf-type crops with normal *** created translocation lines based on interspecific crosses between Chinese cabbage and cabbage and identified qdh225,which exhibited a swollen-root *** swollen root of qdh225 contained a large number of granular substances,and the formation of its irregular morphological tissue was caused by a thickening of the *** and metabolomic data suggested that differential expression of genes encoding nine types of enzymes involved in starch and sucrose metabolism caused changes in starch synthesis and degradation in the swollen *** genes jointly regulated sucrose and starch levels,leading to significant enrichment of starch and soluble proteins in the swollen root and a reduction in the content of soluble sugars such as d-glucose and trehalose 6-phosphate.A significant increase in auxin(IAA)and abscisic acid(ABA)contents and a decrease in gibberellin(GA)content in the swollen root likely promoted the differential expression of genes associated with hormone signal transduction,thereby regulating the development of the swollen *** together,our data suggest that accumulation of IAA and ABA and reduction in GA promote swollen root formation by regulating hormone-mediated signaling,leading to a thickening of phloem,root enlargement,and substantial accumulation of starch and soluble *** latter provide materials,energy,and nutrient sources for the development of swollen roots.

关键词： crops roots synergistic

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Zeta Potential and Rheological Behavior of ULC Castables Matrix

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China's Refractories 2008年第2期17卷 12-15页

作者： xu yuanchao WANG Zhanmin CAO Xiying Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang 471039 China

Effects of starting materials and four dispersants （ STP, SHP, FDN and FS60 ） on Zeta potential and rheological behavior of alumina based ULC castables matrix were investigated. The results show that： characteristics of silica fume and alumina cements play a very important role in Zeta potential and viscosity of suspensions of the castables matrix; the dispersants STP and SHP can change Zeta potential values of the matrix suspensions remarkably; the four dispersants can effectively improve the rheological properties of matrix suspensions. For the point of lower viscosity of the matrix suspensions, the suitable additions of the three dispersants （ SHP , FDN and FS60 ） are about 0. 2% while that of STP is about 0. 3%.

关键词： Zeta potential Viscosity Dispersant

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水声目标分类算法性能评估

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哈尔滨工程大学学报 2020年第10期41卷 1559-1565页

作者：徐源超蔡志明海军工程大学电子工程学院湖北武汉430033

水声目标分类算法研究中使用的性能指标单一且受样本不平衡影响,其评估方法也不适于样本有限的场景。针对这些问题,本文基于水声场景需求,建立了仿真模型,并分析了性能指标与样本类分布的关系,比较了不同样本条件下各评估方法的估计误... 详细信息

水声目标分类算法研究中使用的性能指标单一且受样本不平衡影响,其评估方法也不适于样本有限的场景。针对这些问题,本文基于水声场景需求,建立了仿真模型,并分析了性能指标与样本类分布的关系,比较了不同样本条件下各评估方法的估计误差。结果表明:PR曲线下面积具有稳定的鉴别力,均衡正确率等指标受样本类分布影响小,各评估方法在样本有限时估值差异显著。据此,本文构建性能指标体系可用于设计和评估算法,提出适应水声需求的修正均衡正确率,同时推荐采用5×2分层交叉验证的评估方法。

关键词：水声目标分类性能指标评估方法分类算法评价指标体系样本不平衡重采样

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Effects of Different Extraction and Purification Methods on the Acquisition of Phycoerythrin from Porphyridium purpureum

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Agricultural Biotechnology 2019年第2期8卷 149-152页

作者： yuanchao xu Shengxin NIE Zhen LIU Jinglong LI College of Biological Engineering Qilu University of Technology(Shandong Academy of Sciences)

Phycoerythrin, as the main light-harvesting antenna in Porphyridium purpureum, exists at the outermost end of the phycobilisome. It has advantages of good fluorescence intensity, anti-oxidation, scavenging free radicals, and high chroma, so it has been widely used in food, cosmetics, pharmaceuticals, and other industries. In this study, the effects of different extraction(ultrasonic breaking method, bead grinding method, liquid nitrogen grinding method, and freezing-thawing method) and purification methods(salting out method, ultrafiltration method, and combination of salting out and ultrafiltration method) on the acquisition of phycoerythrin from P. purpureum were studied, and the characteristics of phycoerythrin in the P. purpureum were identified. The results showed that the freezing-thawing method could extract phycoerythrin from the powder of P. purpureum to the utmost extent, and the concentration of the extracted phycoerythrin was up to 0.036 g/L. The salting out method could most effectively purify phycoerythrin, and the purity index was 2.216. The identification of phycoerythrin by ultraviolet absorption spectroscopy and fluorescence spectroscopy indicated that the phycoerythrin had the maximum absorption peak at 545 nm, and the maximum Stokes shift was up to 79 nm. Due to its high fluorescence characteristics, it can be used as a fluorescent marker in the fields of molecular biology and clinical medicine, and can also be used as a good photosensitizer in tumor therapy.

关键词： Phycoerythrin Extraction Purification Identification

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面向高通量应用的众核处理器任务调度

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清华大学学报（自然科学版） 2017年第3期57卷 244-249页

作者：徐远超杨璐首都师范大学信息工程学院北京100048 中国科学院计算技术研究所计算机体系结构国家重点实验室北京100190

具有高通量特征的大数据应用已成为目前数据中心的主流应用,这些应用在传统处理器平台上的运行效率不高,原因之一是任务调度的低效。针对高通量应用的一些典型特征以及现有任务窃取算法的不足,该文提出一种程序行为和环境感知的任务调... 详细信息

具有高通量特征的大数据应用已成为目前数据中心的主流应用,这些应用在传统处理器平台上的运行效率不高,原因之一是任务调度的低效。针对高通量应用的一些典型特征以及现有任务窃取算法的不足,该文提出一种程序行为和环境感知的任务调度机制,通过软硬件结合实现了处理器核的分区管理和任务的分级调度,减小了不同应用之间因争用共享资源对性能产生的不利影响,同时利用线程相似度高的特点提高指令缓存的命中率,从而提升系统的整体吞吐率。初步的模拟评估表明:该算法在混合负载情况下性能明显优于现有算法的,在测试的混合负载中平均优于现有算法20%。

关键词：众核处理器大数据应用高通量任务调度

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Phytoene synthases 1 modulates tomato fruit quality through influencing the metabolic flux between carotenoid and flavonoid pathways

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Horticultural Plant Journal 2024年第6期10卷 1383-1397页

作者： xue Cao Ran Du yuanchao xu Yaoyao Wu Keyi Ye Jing Ma Yaqing Lyu Tianshu Sun Xijian Zhu Zhihong Liu Jian Yin Guangtao Zhu Zejun Huang Hongjun Lyu Sanwen Huang Jinzhe Zhang College of Horticulture Northwest A&F UniversityYanglingShaanxi 712100China State Key Laboratory of Vegetable Biobreeding Institute of Vegetables and FlowersChinese Academy of Agricultural SciencesBeijing 100081China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenGuangdong 518120China Institute of Vegetables Shandong Academy of Agricultural SciencesShandong Province Key Laboratory for Biology of Greenhouse VegetablesShandong Branch of National Improvement Center for VegetablesHuang-Huai-Hai Region Scientific Observation and Experimental Station of VegetablesMinistry of Agriculture and Rural AffairsJinanShandong 250100China The AGISCAAS-YNNU Joint Academy of Potato Sciences Yunnan Normal UniversityKunmingYunnan 650500China College of Horticulture Qingdao Agricultural UniversityQingdaoShandong 266109China

The deterioration in fruit quality of commercial tomatoes is a major concern of modern tomato ***,the metabolism and genetics of fruit quality are poorly ***,we performed transgenic and molecular biology experiments to reveal that tomato phytoene synthase 1(SlPSY1)is responsible for the accumulation of an important flavor chemical,6-methyl-5-hepten-2-one(MHO).To dissect the function of SlPSY1 in regulating fruit quality,we generated and analyzed a dataset encompassing over 2000 compounds detected by GC-MS and LC-MS/MS along with transcriptomic *** combined results illustrated that SlPSY1 deficiency imparts novel flavor to yellow tomatoes with 236 volatiles significantly changed and improves fruit firmness,possibly due to accumulation of seven *** analysis indicated SlPSY1 is essential for carotenoid-derived metabolite biosynthesis by catalyzing prephytoene-PP(PPPP)to ***,we showed that SlPSY1 can influence the metabolic flux between carotenoid and flavonoid pathways,and this metabolic flux was confirmed by silencing *** study provided insights into the multiple effects of SlPSY1 on tomato fruit metabolome and highlights the potential to produce high-quality fruit by rational design of SlPSY1 expression.

关键词： Tomato Flavor Metabolome Phytoene synthase 1 Carotenoid Flavonoid

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Chromosome-scale genome assembly of Cucumis hystrix-a wild species interspecifically cross-compatible with cultivated cucumber

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Horticulture Research 2021年第1期8卷 655-668页

作者： Xiaodong Qin Zhonghua Zhang Qunfeng Lou Lei Xia Ji Li Mengxue Li Junguo Zhou Xiaokun Zhao yuanchao xu Qing Li Shuqiong Yang Xiaqing Yu Chunyan Cheng Sanwen Huang Jinfeng Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural University210095 NanjingChina College of Horticulture Qingdao Agricultural University266109 QingdaoChina Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences100081 BeijingChina College of Horticulture and Landscape Henan Institute of Science and Technology453003 XinxiangChina Agricultural Genomics Institute Chinese Academy of Agricultural Sciences518120 ShenzhenChina

Cucumis hystrix Chakr.(2n=2x=24)is a wild species that can hybridize with cultivated cucumber(*** L.,2n=2x=14),a globally important vegetable ***,cucumber breeding is hindered by its narrow genetic ***,introgression from *** has been anticipated to bring a breakthrough in cucumber ***,we report the chromosome-scale assembly of *** genome(289 Mb).Scaffold N50 reached 14.1 *** 90%of the sequences were anchored onto 12 chromosomes.A total of 23,864 genes were annotated using a hybrid ***,we conducted a comprehensive comparative genomic analysis of cucumber,***,and melon(*** L.,2n=2x=24).Whole-genome comparisons revealed that *** is phylogenetically closer to cucumber than to melon,providing a molecular basis for the success of its hybridization with ***,expanded gene families of *** were significantly enriched in“defense response,”and *** harbored 104 nucleotide-binding site-encoding disease resistance gene ***,121 genes were positively selected,and 12(9.9%)of these were involved in responses to biotic stimuli,which might explain the high disease resistance of *** alignment of whole *** genome with cucumber genome and self-alignment revealed 45,417 chromosome-specific sequences evenly distributed on *** ***,we developed four *** alien addition lines and identified the exact introgressed chromosome using molecular and cytological *** assembled *** genome can serve as a valuable resource for studies on Cucumis evolution and interspecific introgression breeding of cucumber.

关键词： breeding alignment closer

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基于双对数谱和卷积网络的船舶辐射噪声分类

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电子与信息学报 2022年第6期44卷 1947-1955页

作者：徐源超蔡志明孔晓鹏海军工程大学电子工程学院武汉430033

卷积层平移等变性与线性谱不适配,卷积网络对高维特征的长距离依赖建模能力不足。该文提出一种双对数谱特征用于船舶辐射噪声分类。双对数谱通过重新排列对数谱频点,保证高频端分辨率的同时,规避使用太深的卷积网络。利用双对数谱各行... 详细信息

卷积层平移等变性与线性谱不适配,卷积网络对高维特征的长距离依赖建模能力不足。该文提出一种双对数谱特征用于船舶辐射噪声分类。双对数谱通过重新排列对数谱频点,保证高频端分辨率的同时,规避使用太深的卷积网络。利用双对数谱各行表征同一目标的先验知识,构建卷积网络和目标函数。DeepShip数据集上的试验结果表明,特征维数相同情况下,提出的算法分类正确率比以线性谱为输入的卷积网络提高2.4%以上。

关键词：船舶辐射噪声分类卷积神经网络对数谱低频分析记录平移等变性

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面向新型非易失存储的文件系统研究综述

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计算机应用研究 2021年第6期38卷 1601-1610页

作者：徐远超首都师范大学信息工程学院北京100048

新型非易失存储(NVM)可字节寻址,具有近似内存的低延迟特性以及外存的非易失性,受限于软硬件技术成熟度,目前首先被用于外存。讨论了NVM用于持久性外存所面临的一系列问题,以及管理上的一些挑战;对现有的典型NVM文件系统及其主要特性进... 详细信息

新型非易失存储(NVM)可字节寻址,具有近似内存的低延迟特性以及外存的非易失性,受限于软硬件技术成熟度,目前首先被用于外存。讨论了NVM用于持久性外存所面临的一系列问题,以及管理上的一些挑战;对现有的典型NVM文件系统及其主要特性进行了梳理。归纳起来,这些特性主要围绕降低一致性开销、降低软件栈开销、内存与外存的融合、分布式文件系统、NVM文件系统安全、容错、空间管理几个方面展开。最后,展望了NVM文件系统仍然有待探讨的几个研究方向,包括扩展性问题、虚拟内存与文件系统的有机融合以及分布式文件系统等。

关键词：非易失存储文件系统虚拟内存持久性外存远程直接内存访问

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eMMC可靠性分析与增强对策研究

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计算机应用研究 2017年第11期34卷 3367-3372页

作者：徐远超首都师范大学信息工程学院北京100048

eMMC是可以自我管理的闪存(NAND Flash)芯片,内部集成了控制器,实现了多芯片封装,简化了应用接口设计,节省了板级空间,在移动终端领域得到了广泛应用。然而,基于Flash的存储器件在掉电时容易出现比特位损坏、元数据损坏、非串行写,甚至... 详细信息

eMMC是可以自我管理的闪存(NAND Flash)芯片,内部集成了控制器,实现了多芯片封装,简化了应用接口设计,节省了板级空间,在移动终端领域得到了广泛应用。然而,基于Flash的存储器件在掉电时容易出现比特位损坏、元数据损坏、非串行写,甚至器件不可用等可靠性问题,针对如何提高eMMC的可靠性进行了研究,提出了一些可靠性增强措施。全面梳理了eMMC规范提供的可靠性特性,包括分区管理、写保护管理、可靠写、数据标签、断电通知等;对现有的各种可靠性措施进行了综合分析,并提出了一些提升可靠性的措施,包括文件系统感知的磨损均衡、根据数据属性映射到合理分区、减少写入次数、降低写放大效应、面向手机应用的元数据去冗、应用差异化细粒度控制可靠性、确保一致性的前提下减少日志等。

关键词： eMMC 可靠性元数据损坏掉电保护闪存

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