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The genome-wide meiotic recombination landscape in ciliates and its implications for crossover regulation and genome evolution

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Journal of Genetics and Genomics 2024年第3期51卷 302-312页

作者： Lu Fu Chen Gu Kazufumi Mochizuki Jie Xiong wei miao Guangying Wang Key Laboratory of Aquatic Biodiversity and Conservation Institute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China University of Chinese Academy of Sciences Beijing 100049China Institute of Human Genetics(IGH) CNRSUniversity of Montpellier34396 MontpellierFrance Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture Chinese Academy of SciencesWuhanHubei 430072China Key Laboratory of Lake and Watershed Science for Water Security Chinese Academy of SciencesNanjingJiangsu 210008China

Meiotic recombination is essential for sexual reproduction and its regulation has been extensively studied in many ***,genome-wide recombination landscape has not been reported in ciliates and it remains unknown how it is affected by the unique features of ciliates:the synaptonemal complex(SC)-independent meiosis and the nuclear ***,we show the recombination landscape in the model ciliate Tetrahymena thermophila by analyzing single-nucleotide polymorphism datasets from 38 hybrid *** detect 1021 crossover(CO)events(35.8 per meiosis),corresponding to an overall CO rate of 9.9 cM/***,gene conversion by non-crossover is rare(1.03 per meiosis)and not biased towards G or C *** with the reported roles of SC in CO interference,we find no obvious sign of CO *** tends to occur within germ-soma common genomic regions and many of the 44 identified CO hotspots localize at the centromeric or subtelomeric *** ontology analyses show that CO hotspots are strongly associated with genes responding to environmental *** discuss these results with respect to how nuclear dimorphism has potentially driven the formation of the observed recombination landscape to facilitate environmental adaptation and the sharing of machinery among meiotic and somatic recombination.

关键词： Meiotic recombination Hotspot Crossover interference Adaptive evolution

Synergy of sodium doping and nitrogen defects in carbon nitride for promoted photocatalytic synthesis of hydrogen peroxide

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Chinese Chemical Letters 2024年第8期35卷 324-329页

作者： Fabrice Nelly Habarugira Ducheng Yao wei miao Chengcheng Chu Zhong Chen Shun Mao College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Baowu Water Technology Co. Ltd.Research InstituteShanghai 201999China

Photocatalytic synthesis of hydrogen peroxide has gradually become a promising method for in-situ pro-duction of hydrogen peroxide,which relies on sustainable solar ***,the commonly used photocatalyst,i.e.,carbon nitride(CN),still suffers from the drawbacks of narrow light absorption range and fast charge ***,we report a facile method to introduce nitrogen defects into carbon nitride together with sodium *** adjusting the ratio of sodium dicyandiamide,the band gap of carbon nitride can be controlled,while the carrier separation and transfer ability of carbon nitride is *** modified CN with sodium doping and nitrogen defect(SD-CN)demonstrates outstanding H_(2)O_(2)pro-duction performance(H_(2)O_(2)yield rate of 297.2μmol L^(−1)h^(−1))under visible light irradiation,which is approximately 9.8 times higher than that of pristine *** work deepens the understanding of the coordinated effect of structural defect and element doping of carbon nitride on the photocatalytic H_(2)O_(2)production performance,and provides new insight into the design of photocatalytic system for efficient production of H_(2)O_(2).

关键词： Photocatalysis H_(2)O_(2)evolution Sodium doping Nitrogen defect Metal-free catalyst

Filling the gaps in icosahedral superatomic metal clusters

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National Science Review 2024年第7期11卷 168-176页

作者： wei-miao He Jia-Hua Hu Yu-Jia Cui Jing Li Yu-Bing Si Shuai-Bo Wang Yu-Jing Zhao Zhan Zhou Lu-Fang Ma Shuang-Quan Zang College of Chemistry Zhengzhou University School of Science Xuchang University College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal University

Chemically modified superatoms have emerged as promising candidates in the new periodic table, in which Au13and its doped M_nAu13-nhave been widely studied. However, their important counterpart, Ag13artificial element, has not yet been synthesized. In this work, we report the synthesis of Ag13nanoclusters using strong chelating ability and rigid ligands, that fills the gaps in the icosahedral superatomic metal clusters. After further doping Ag13template with different degrees of Au atoms, we gained insight into the evolution of their optical properties. Theoretical calculations show that the kernel metal doping can modulate the transition of the excited-state electronic structure, and the electron transfer process changes from local excitation（LE） to charge transfer（CT） to LE. This study not only enriches the families of artificial superatoms, but also contributes to the understanding of the electronic states of superatomic clusters.

关键词： icosahedral superatomic metal clusters analog clusters photoluminescence alloying near-infrared quantum yield

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高夷在东北史谱系中的地位

北方文物 2024年第4期 85-91,112页

作者：苗威山东大学东北亚学院

存在于商朝末期至东汉初年的“高夷”,在东北史谱系中是承上启下的重要古族。其源头是东北三大原始族群之一“北发”,曾在周朝初年参加“成周之会”。及燕昭王向东北拓疆,并设置辽东郡,高夷居地被纳入到该郡的辖区内。至西汉昭帝时,转... 详细信息

存在于商朝末期至东汉初年的“高夷”,在东北史谱系中是承上启下的重要古族。其源头是东北三大原始族群之一“北发”,曾在周朝初年参加“成周之会”。及燕昭王向东北拓疆,并设置辽东郡,高夷居地被纳入到该郡的辖区内。至西汉昭帝时,转归玄菟郡管辖。东汉初,高夷之地全部为高句丽占领,高夷因而成为高句丽的主要来源。

关键词：高夷东北谱系北发

Observation of Giant Topological Hall Effect in Room-Temperature Ferromagnet Cr_(0.82)Te

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Chinese Physics Letters 2024年第6期41卷 128-140页

作者：苗伟婷甄伟立陆振王恒宁王杰牛群田明亮 Anhui Key Laboratory of Low-energy Quantum Materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch Graduate School of University of Science and Technology of ChinaHefei 230026China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China

Novel magnetic materials with non-trivial magnetic structures have led to exotic magnetic transport properties and significantly promoted the development of spintronics in recent *** them is the Crx Tey family,the magnetism of which can persist above room temperature,thus providing an ideal system for potential spintronic *** we report the synthesis of a new compound,Cr_(0.82)Te,which demonstrates a record-high topological Hall effect at room temperature in this ***_(0.82)Te displays soft ferromagnetism below the Curie temperature of 340 *** magnetic measurement shows an obvious magneto-crystalline anisotropy with the easy axis located in the ab *** anomalous Hall effect can be well explained by a dominating skew scattering ***,after removing the normal Hall effect and anomalous Hall effect,a topological Hall effect can be observed up to 300 K and reaches up to 1.14μΩ·cm at 10 K,which is superior to most topological magnetic structural *** giant topological Hall effect possibly originates from the noncoplanar spin configuration during the spin flop *** work extends a new Cr_(x)Te_(y) system with topological non-trivial magnetic structure and broad prospects for spintronics applications in the future.

关键词： mechanism process topological

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弹丸定心部-身管接触模型及其应用

振动与冲击 2024年第6期43卷 157-170页

作者：缪伟尹强钱林方南京理工大学机械工程学院南京210094 西北机电工程研究所陕西咸阳712099

研究弹丸定心部与炮膛的接触现象对于理解弹丸膛内运动规律具有重要的意义,为此提出一个弹丸定心部-身管接触模型。假设定心部与阳线间的接触应力只沿阳线长度方向变化,将阳线表面简化成空间曲线;用阳线围成的笼形结构描述内膛的几何,... 详细信息

研究弹丸定心部与炮膛的接触现象对于理解弹丸膛内运动规律具有重要的意义,为此提出一个弹丸定心部-身管接触模型。假设定心部与阳线间的接触应力只沿阳线长度方向变化,将阳线表面简化成空间曲线;用阳线围成的笼形结构描述内膛的几何,提出了定心部与阳线的接触检测算法。将弹丸和身管沿着圆周方向展开,使用一个二维接触问题的解析解计算接触应力。针对接触应力的方根奇异性,采用Chebyshev-Gauss积分公式计算定心部与阳线的接触载荷。给出了确定模型参数的拟合方法和参数辨识方法。理论分析表明定心部与炮膛的接触刚度随着弹丸膛内行程变化。根据数值算例分析了弹丸质心偏移量对定心部与炮膛接触方式及前定心部磨损刻痕形成的影响。计算结果表明定心部受力的等效接触点并不位于定心部中心或棱线上。

关键词：接触力模型弹-管接触发射动力学参数辨识

职业教育助推共同富裕的学理诠释、效用分析与实践路径——基于人力资本理论的演进脉络

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职业技术教育 2024年第16期45卷 36-43页

作者：韦妙刘小艳湖北工业大学职业技术师范学院武汉430068

职业教育作为与社会经济发展联系最密切的类型教育能推动实现共同富裕,这一观点虽受到学界广泛认可但仍缺乏理论层面的严密论证和细致分析。从人力资本理论出发,中国特色共同富裕就是要让全体人民公平地积累人力资本,回顾半个多世纪以... 详细信息

职业教育作为与社会经济发展联系最密切的类型教育能推动实现共同富裕,这一观点虽受到学界广泛认可但仍缺乏理论层面的严密论证和细致分析。从人力资本理论出发,中国特色共同富裕就是要让全体人民公平地积累人力资本,回顾半个多世纪以来人力资本理论的演化历程,人力资本教育投资的异质性、外溢性、多维性特征揭示了共同富裕的差异性、全民性、全面性三层需求。在助推共同富裕的实践进程中,职业教育应以高度的适应性主动变革,传导人力资本的经济效用,以普惠型职业教育促使社会阶层流动;释放人力资本的社会效用,以终身化职业教育促进技能型社会建设;激活人力资本的文化效用,以全人型职业教育促进人的自由和全面发展。

关键词：职业教育共同富裕人力资本理论普惠型职业教育终身型职业教育全人型职业教育

历史书写与民族认同:大韩帝国历史教科书考察

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世界历史 2024年第2期 17-30,I0002,I0003页

作者：苗威于亦璇山东大学历史文化学院山东大学东北亚学院

19世纪末20世纪初,朝鲜半岛脱离传统的中华天下秩序,融入西方世界的“条约体系”。在日本的殖民压力下,大韩帝国艰难地支撑着“独立”之名。朝鲜半岛人将救国的期待寄托于历史教育与书写,官方和民间先后主导编刊了十余部历史教科书,表... 详细信息

19世纪末20世纪初,朝鲜半岛脱离传统的中华天下秩序,融入西方世界的“条约体系”。在日本的殖民压力下,大韩帝国艰难地支撑着“独立”之名。朝鲜半岛人将救国的期待寄托于历史教育与书写,官方和民间先后主导编刊了十余部历史教科书,表达了建构民族认同的社会诉求。作为社会转型期的产物,大韩帝国历史教科书受到国内开化改革势力、爱国史家及日本殖民势力的影响,其历史书写混杂了传统“东国”史观、民族主义史观、殖民主义史观等历史观念。历史教科书采取以民族为本位的述史模式,通过始祖建构加强民族起源书写,实现对民族历史的溯源,制造共同的历史记忆,但在传统中华天下秩序中作为“东国”的区域史书写范式及历史观念仍有余响;加之日本殖民势力对朝鲜史书写的介入,导致历史教科书无法再书写独立与自主,大韩帝国覆亡后旋即遭到封禁。在东亚原有政治秩序解体的历史语境下,大韩帝国历史教科书是近代转型期朝鲜半岛史学的显性表达,展现了力图塑造民族认同的逻辑与理路。

关键词：大韩帝国历史书写历史教科书民族认同日本殖民势力

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燃气轮机提升引射冷却空气量研究

舰船科学技术 2024年第8期46卷 122-125页

作者：魏昌淼中国船舶集团有限公司第七〇三研究所无锡分部江苏无锡214151

燃气轮机使用过程,由于引射空气不足造成了箱装体超温报警故障。从引射空气原理出发,对燃气轮机试验台进行建模并计算,实际试验数据验证计算模型的准确性。利用验证后的计算模型计算,结果排气蜗壳出口面积缩小后可增大引射空气量;最后... 详细信息

燃气轮机使用过程,由于引射空气不足造成了箱装体超温报警故障。从引射空气原理出发,对燃气轮机试验台进行建模并计算,实际试验数据验证计算模型的准确性。利用验证后的计算模型计算,结果排气蜗壳出口面积缩小后可增大引射空气量;最后通过更换喷口试验,试验表明额定功率下,直径为1280 mm、1250 mm的喷口,较直径为1330 mm的喷口引射空气流量分别提高了9.4%、22.3%,箱装体出口空气温度分别降低了7℃、14℃。

关键词：燃气轮机冷却引射空气