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Unveiling an ancient whole-genome duplication event in Stentor,the model unicellular eukaryotes

Science China Life Sciences 2025年

作者： weibo zheng Chao Li Zhaorui Zhou Xiao Chen Michael Lynch Ying Yan School of Life Sciences Ludong University Key Laboratory of Evolution & Marine Biodiversity (Ministry of Education) and Institute of Evolution & Marine Biodiversity Ocean University of China Biodesign Center for Mechanisms of Evolution Arizona State University Marine College Shandong University

Whole-genome duplication(WGD) events are widespread across eukaryotes and have played a significant role in moulding the genetic architectures of diverse organisms. In the present study, the newly sequenced genome of a giant ciliated protist, Stentor roeselii, provides an opportunity for the analysis of the collinearity and retention of reciprocal best-hit genes between two Stentor species. As a main result, we have unveiled a previously undetected ancient WGD event shaping the genome of its congener, Stentor coeruleus, a model protist used in cytological and evolutionary studies. Genomes of two congeners, S. coeruleus and S. roeselii, are compared and analyzed, revealing that:(i)the former exhibits a much higher retention rate of colinear-gene pairs(28%) than does S. roeselii, and in S. coeruleus, 75% of genes that have a RBH hit in S. roeselii, have paralogs with high amino-acid identity, consistent with a WGD event in the lineage leading to S. coeruleus;(ii) the S. roeselii genome possesses extremely short intergenic regions, implying that the lengths of intergenic regions are under strong selection;(iii) the unique characteristics of introns may have been shaped in the common ancestor of heterotrichs;(iv) gene families that play a role in activities of multiple protein kinases and voltage-gated ion channels expanded rapidly in the ancestor of both taxa, possibly relating to the remarkable regenerative ability in Stentor. This study offers new insights into the evolutionary dynamics of ciliate genomes,with implications for understanding of the processes underlying the evolution of genomic complexity.

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Chromosome organization and gene expansion in the highly fragmented genome of the ciliate Strombidium stylifer

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Journal of Genetics and Genomics 2021年第10期48卷 908-916页

作者： Chao Li Xiao Chen weibo zheng Thomas G.Doak Guangyi Fan weibo Song Ying Yan Institute of Evolution&Marine Biodiversity Ocean University of ChinaQingdao 266003China Marine College Shandong UniversityWeihai 264209China School of Life Sciences Ludong UniversityYantai 264025China Department of Biology Indiana UniversityBloomingtonIN 47405USA National Center for Genome Analysis Support Indiana UniversityBloomingtonIN 47405USA BGI-Qingdao BGI-ShenzhenQingdao 266555China State Key Laboratory of Agricultural Genomics BGI-ShenzhenShenzhen 518083China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Chromosomes are well-organized carriers of genetic information in eukaryotes and are usually quite long,carrying hundreds and thousands of ***,a clade of single-celled ciliates,Spirotrichea,feature nanochromosomes—also called“gene-sized chromosomes”.These chromosomes predominantly carry only one gene,flanked by short telomere ***,the organization and copy number variation of the chromosomes in these highly fragmented genomes remain unexplored in many groups of Spirotrichea,including the marine *** deep genome sequencing,we assembled the macronuclear genome of Strombidium stylifer into more than 18,000 nanochromosomes(~2.4 Kb long on average).Our results show that *** occupies an intermediate position during the evolutionary history of Strombidium lineage and experienced significant expansions in several gene families related to guanyl ribonucleotide *** on the nucleotide distribution bias analysis and conserved motifs search in non-genic regions,we found that the subtelomeric regions have a conserved adenine-thymine(AT)-rich sequence *** also found that the copy number of nanochromosomes lacks precise *** work sheds light on the unique features of chromosome structure in eukaryotes with highly fragmented genomes and reveals that a rather specialized evolutionary strategy at the genomic level has resulted in great diversity within the ciliated lineages.

关键词： Ciliate Copy number Nanochromosome Nucleotide distribution bias Strombidium stylifer

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Research on Performance Optimization of Phase Change Thermal Storage Electric Heating Device

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Journal of Power and Energy Engineering 2024年第11期12卷 153-162页

作者： weibo zheng College of New Energy China University of Petroleum (East China) Qingdao China

At present, the main heating method for reducing crude oil viscosity is electric heating, and the all-day electric heating method has the problems of high energy consumption and high cost. In order to meet the needs of environmental protection and industrial production, a new type of phase change thermal storage electric heating device was designed by combining the crude oil viscosity reduction heating method with valley price and phase change materials. The results indicate that as the inlet flow rate of the working fluid increases, the outlet temperature continuously decreases. And when the outlet temperature rises to 10?C, the inlet flow rate of the device can meet the flow range of 1.413 - 2.120 m3/h. At the same time, the addition of foam nickel makes the internal temperature of PCM more uniform, and the internal temperature of PCM decreases with the decrease of porosity of foam metal. By increasing the number of electric heating rods and reducing the power of individual electric heating rods, the structure of the device was optimized to significantly improve local high-temperature phenomena. The use of this device can maintain high heat exchange efficiency and reduce production costs.

关键词： Crude Oil Viscosity Reduction Phase Change Thermal Storage Electric Heating Valley Electricity Price

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Preparation and Electrochemical Performance of Li[Ni1/3Co1/3Mn1/3]O2 Synthesized Using LizCO3 as Template

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Chinese Journal of Chemistry 2015年第11期33卷 1303-1309页

作者： Jibin Zhang Yanjun Zhong Xiaxing Shi Zhuo zheng weibo Hua Yanxiao Chen Wenyuan Liu Benhe Zhong College of Chemical Engineering Sichuan University Chengdu Sichuan 610065 China

Porous structure Li[Ni1/3Co1/3Mn1/3]O2 has been synthesized via a facile carbonate co-precipitation method using Li2CO3 as template and lithium-source. The physical and electrochemical properties of the materials were examined by many characterizations including TGA, XRD, SEM, EDS, TEM, BET, CV, EIS and galvanostatic charge-discharge cycling. The results indicate that the as-synthesized materials by this novel method own a well-ordered layered structure a-NaFeO2 [space group： R-3m（166）], porous morphology, and an average primary particle size of about 150 nm. The porous material exhibits larger specific surface area and delivers a high initial capacity of 169.9 mAh·g^-1 at 0.1 C （1 C=180 mA·g ^-1） between 2.7 and 4.3 V, and 126.4, 115.7 mAh.g 1 are still respectively reached at high rate of 10 C and 20 C. After 100 charge-discharge cycles at 1 C, the capacity retention is 93.3%, indicating the excellent cycling stability.

关键词： porous structure Li[Ni1/3Co1/3Mn1/3]O2 cathode material lithium-ion batteries rate performance

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Experimental Investigation of Regular or Wavy Two-Phase Flow in a Manifold

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Fluid Dynamics & Materials Processing 2023年第1期19卷 37-50页

作者： Xiaowei Nie Lihui Ma Yiqiu Xu Dong Sun weibo zheng Liang Zhou Xiaodong Wang Xiaohan Zhang Weijia Dong Yunfei Li Sionpec Shengli Oilfield Company Dongying257000China Technical Inspection Center Sionpec Shengli Oilfield CompanyDongying257000China Offshore Oil Engineering Co. Ltd.Dongying257000China

An experimental study was conducted to investigate the properties of stratified regular or wavy two-phase flow in two parallel separators located after a manifold.A total of 103 experiments with various gas and liquid velocity combinations in three inlet pipes were conducted,including 77 groups of outlet pipe resistance symmetry and 26 groups of outlet pipe resistance asymmetry *** experimental results have revealed that when the gas-liquid flow rate is low,the degree of uneven splitting is high,and“extreme”conditions are *** the superficial gas velocity is greater than that established in the extreme case,the direction of the liquid-phase displacement is reversed,while that of the gas remains ***,the degree of gas phase bias tends to be mitigated with an increase in the gas velocity,while the uneven splitting degree of liquid approaches 10%.Finally,varying the gas-phase outlet pipe resistance is shown to effectively change the gas-liquid two-phase flow distribution.

关键词： Uneven phase distribution two-phase flow manifold asymmetric resistance

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Vein visualization enhancement by dual-wavelength phase-locked denoising technology

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Journal of Innovative Optical Health Sciences 2024年第3期17卷 73-83页

作者： Lihua Ruan Zhiqin Yin Shibing Zhou weibo zheng Wei Lu Tao Zhang Shaowei Wang Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083P.R.China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083P.R.China Shanghai Engineering Research Center of Energy-Saving Coatings Shanghai 200083 P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Shanghai Tech University Shanghai 201210P.R.China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210P.R.China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China

Visual near-infrared imaging equipment has broad applications in various fields such as venipuncture,facial injections,and safety verification due to its noncontact,compact,and portable ***,most studies utilize near-infrared single-wavelength for image acquisition of ***,many substances in the skin,including water,protein,and melanin can create significant background noise,which hinders accurate *** this paper,we developed a dual-wavelength imaging system with phase-locked denoising technology to acquire vein *** signals in the effective region are compared by using the absorption valley and peak of hemoglobin at 700nm and 940nm,*** phase-locked denoising algorithm is applied to decrease the noise and interference of complex surroundings from the *** imaging results of the vein are successfully extracted in complex noise *** is demonstrated that the denoising effect on hand veins imaging can be improved with 57.3%by using our dual-wavelength phase-locked denoising ***,this work proposes a novel approach for venous imaging with dual-wavelengths and phase-locked denoising algorithm to extract venous imaging results in complex noisy environment better.

关键词： Dual-wavelength phase-locked denoising vein visualization enhancement.

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不同支付条件银行授信约束折现流项目调度

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系统工程理论与实践 2016年第8期36卷 2013-2023页

作者：何正文郑维博刘人境西安交通大学管理学院西安710049 过程控制与效率工程教育部重点实验室西安710049

支付条件对于项目现金流分布并进而对承包商的项目收益会产生重要影响.本文基于这一现实情况,研究不同支付条件下的银行授信额度约束折现流项目调度问题.作者首先综述该问题的研究现状;然后对所研究问题进行界定,进而构建项目调度优化模... 详细信息

支付条件对于项目现金流分布并进而对承包商的项目收益会产生重要影响.本文基于这一现实情况,研究不同支付条件下的银行授信额度约束折现流项目调度问题.作者首先综述该问题的研究现状;然后对所研究问题进行界定,进而构建项目调度优化模型;针对问题的NP-hard属性,设计模拟退火启发式算法;在随机生成的标准算例集合上,对算法的绩效进行对比测试及验证;最后用一个算例对研究进行说明,并分析项目收益对关键参数的敏感性,得到如下结论:项目净现值随银行授信额度和截止日期的增加而边际效应递减地上升,随支付比例的增加而线性单调上升,随折现率的增加以负指数形式下降.本文的研究可以为承包商安排项目进度并优化现金流量提供决策支持.

关键词：折现流项目调度优化模型模拟退火银行授信额度支付条件

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Breakthrough in enclosed aquatic ecosystems in space:Supporting zebrafish survival for 43 days

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The Innovation 2024年第6期5卷 9-10页

作者： Maobin Xie Qing Tian Gaohong Wang weibo zheng Shaowei Wang Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China Shanghai Engineering Research Center of Energy-Saving Coating Shanghai 200083China University of Chinese Academy of Sciences Beijing 100049China

In June 2024,the China space station’s closed aquatic ecosystem(CSS’s CAES)achieved a remarkable feat:zebrafish completed their life stages,from growth to development and reproduction,in 43 days,setting a new record for space ecological *** not onlymeans progress inChina’s space ecosystem technology but also provides valuable data and technical support for closed-loop ecosystems in space missions.

关键词： ecosystems fish record

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一种基于交互式遗传算法的图书经费分配群决策模型

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图书情报工作 2010年第19期54卷 90-93页

作者：郑微波绵阳师范学院图书馆绵阳621000

提出一种基于交互式遗传算法的大学图书馆藏书建设中图书采购经费分配群决策系统模型,通过人工智能技术把定性决策与定量决策结合起来,解决文献经费分配决策中优化目标非定量化、难以较高效率获得专家群体意见共识的问题。模拟实验反映... 详细信息

提出一种基于交互式遗传算法的大学图书馆藏书建设中图书采购经费分配群决策系统模型,通过人工智能技术把定性决策与定量决策结合起来,解决文献经费分配决策中优化目标非定量化、难以较高效率获得专家群体意见共识的问题。模拟实验反映出该模型能以较高效率达成专家群体意见共识。

关键词：交互式遗传算法图书采购经费分配群决策模型

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模型还原:传播系统的结构表述——一项基于大系统理论的三峡工程影像传播研究

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江淮论坛 2010年第4期 145-150页

作者：郑微波西南政法大学全球新闻传播学院重庆400031

将大系统理论里面的模型还原方法运用到社会科学当中,用以解剖如三峡工程影像传播系统这样的结构复杂,功能重叠的社会系统,具有重要意义。通过建立模型,还原了该系统的结构,并研究了与结构相联系的具体功能,同时分析了这个具体社会系统... 详细信息

将大系统理论里面的模型还原方法运用到社会科学当中,用以解剖如三峡工程影像传播系统这样的结构复杂,功能重叠的社会系统,具有重要意义。通过建立模型,还原了该系统的结构,并研究了与结构相联系的具体功能,同时分析了这个具体社会系统的运行机制。文章通过基本结构和功能的阐释,论证三峡工程影像传播系统存在并运行良好的逻辑合理性,以期待最终证明在现今的传播系统工作环境下,多级递阶的整体结构可以成为大多数传播系统参照的模型结构。

关键词：大系统模型还原多级递阶

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