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Natural Hybridization between Rhododendron delavayi and ***(Ericaceae),from Morphological,Molecular and Reproductive Evidence

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Journal of Integrative Plant Biology 2010年第9期52卷 844-851页

作者： yong-peng ma Chang-Qin Zhang Jing-Li Zhang Jun-Bo Yang Kunming Botanic Garden Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Key Laboratory of Resource Plants and Biotechnology Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Graduate University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China Tunnan Agricultural University Kunming 650201 China Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

The natural hybridization that occurs between two sympatric species of Rhododendron subgenus Hymenanthes in Yunnan, China, was investigated. In field observations, it was noted that the putative hybrids between R. delavayi Franch. and R. cyanocarpum （Franch.） Franch. ex W.W. Sm. had intermediate morphologies. On the basis of morphology, chloroplast DNA （trnL-rp132） and nuclear DNA （waxy）, hybrids and parental species were identified. Hybridization occurred in both directions, but was asymmetrical, with R. delavayi as the major maternal parent. Reciprocal hand pollination treatments showed that either species, as pollen donor or pollen receiver, could produce fruits. It was noted that fruit set varied among treatments. The same pollinators （bumblebees） were shared in both parental species. From these results, we conclude that individuals with intermediate morphologies are indeed of hybrid origin from natural hybridization between R. cyanocarpum and R. delavayi. Furthermore, we presume the hybridization at the study site could have been initiated by habitat disturbance in the 1950s, and we may hence witness the early stages of hybrid swarm formation.

关键词： HYBRIDIZATION DNA CHLOROPLAST DNA POLLINATION BUMBLEBEES

Rhododendron kuomeianum(Ericaceae),a new species from northeastern Yunnan(China),based on morphological and genomic data

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Plant Diversity 2021年第4期43卷 292-298页

作者： Yu-Hang Chang Gang Yao Jens Neilsen De-Tuan Liu Lu Zhang yong-peng ma Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan 650201China Key Laboratory for Plant Diversity and Biogeography of East Asia Chinese Academy of SciencesKunmingYunnan 650201China Dobbies Garden Centre UK-DD2 PerthScotlandUK Flower Research Institute Yunnan Academy of Agricultural SciencesKunmingYunnan 650051China

Rhododendron kuomeianum ***,***&***,a new species of Rhododendron(Ericaceae)within *** in *** from Yiliang County,NE Yunnan,China,is described and *** new species is similar to ***,but it can be easily distinguished by its sparse scales on the abaxial surface of the leaf blade,fewer flowers per inflorescence and white corolla with pale red *** are also differences in the widths of calyx lobes,leaf blade shape and indumentum characteristics of the petiole between the new species and Rhododendron *** confirmed that *** is a new species closely related to *** and *** with phylogenomic studies of 10 species within this subsection based on restriction site-associated DNA sequencing(RADseq)*** phylogenomic analyses also clarified additional taxonomic problems in this subsection previously raised by morphological *** findings make a strong case for using next-generation sequencing to explore phylogenetic relationships and identify new species,especially in plants groups with complicated taxonomic problems.

关键词： Rhododendron New species RAD-seq Phylogenetic position

The Extension Dimension of Subcategories and Recollements of Abelian Categories

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Acta mathematica Sinica,English Series 2024年第4期40卷 1042-1058页

作者： Xin ma Ye Yang peng Zhao yong HUANG College of Science Henan University of EngineeringZhengzhou 451191P.R.China Department of mathematics Nanjing UniversityNanjing 210093P.R.China

We investigate the behavior of the extension dimension of subcategories of abelian categories under ***Λ',Λ,Λ"be art in algebras such that(modΛ',mod A,modΛ")is a recollement,and let D'and D"be subcategories of modΛand modΛ"*** any n,m≥0,under some conditions,we get dimΩ^(k)(D)≤dimΩ^(n)(D')+dimΩ^(m)(D")+1,where k=max{m,n}and D is the subcategory of modΛglued by D'and D";moreover,we give a sufficient condition such that the converse inequality holds *** applications,some results for Igusa-Todorov subcategories and syzygy finite sub categories are obtained.

关键词： Recollements extension dimension Igusa–Todorov subcategories syzygy finite subcategories

Genetic diversity and structure of Rhododendron meddianum,a plant species with extremely small populations

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Plant Diversity 2021年第6期43卷 472-479页

作者： Xiu-Jiao Zhang Xiong-Fang Liu De-Tuan Liu Yu-Rong Cao Zheng-Hong Li yong-peng ma Hong ma Research Institute of Resources Insects Chinese Academy of ForestryKunming650224YunnanChina College of Forestry Nanjing Forestry UniversityNanjing210037JiangsuChina Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations Kunming Institute of BotanyChinese Academy of SciencesKunming650201YunnanChina Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology School of Ecology and Environmental ScienceYunnan UniversityKunming 650504YunnanChina

Rhododendron meddianum is a critically endangered species with important ornamental value and is also a plant species with extremely small *** this study,we used double digest restriction-siteassociated DNA sequencing(ddRAD)technology to assess the genetic diversity,genetic structure and demographic history of the three extant populations of *** of SNPs indicated that *** populations have a high genetic diversity(p?0.0772±0.0024,HE?0.0742±0.002).Both FST values(0.1582e0.2388)and AMOVA showed a moderate genetic differentiation among the *** ***,STRUCTURE,PCoA and NJ trees indicated that the *** samples were clustered into three distinct genetic *** the stairway plot,we found that *** underwent a population bottleneck about 70,000 years ***,demographic models of *** and its relative,Rhododendron cyanocarpum,revealed that these species diverged about 3.05(2.21e5.03)million years *** divergence may have been caused by environmental changes that occurred after the late Pliocene,e.g.,the Asian winter monsoon intensified,leading to a drier *** on these findings,we recommend that *** be conserved through in situ,ex situ approaches and that its seeds be collected for germplasm.

关键词： Rhododendron meddianum ddRAD Genetic diversity Population demography Conservation implications

Repellent,larvicidal and adulticidal activities of essential oil from Dai medicinal plant Zingiber cassumunar against Aedes albopictus

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Plant Diversity 2021年第4期43卷 317-323页

作者： Ming-Xiang Li yong-peng ma Hong-Xia Zhang Hong-Zheng Sun Hong-Hai Su Sheng-Ji Pei Zhi-Zhi Du Key Laboratory of Economic Plants and Biotechnology Yunnan Key Laboratory for Wild Plant ResourcesKunming Institute of BotanyChinese Academy of SciencesKunming650201China University of Chinese Academy of Sciences Beijing100049China Kunming City Center for Disease Control and Prevention Kunming650034China

Zingiber cassumunar is an important plant used in traditional medicine and as a natural mosquito ***,the compounds responsible for the repellent activity of the plant are still *** aim of the study is to identify the components of *** essential oil that show repellent activity against Aedes *** also evaluated the larvicidal and adulticidal activities of *** essential oil against ***-cage mosquito repellent experiments showed that *** essential oil possessed moderate repellent activity with a minimum effective dose(MED)of 0.16±0.01 mg/cm^(20,compared to reference standard N,N-diethyl-3-methylbenzamide(DEET,0.03±0.01 mg/cm^(20).Bioassay-guided fractionation identified the major active compound of *** essential oil as(-)-terpinen-4-ol(1)(MED:0.19±0 mg/cm^(20).We also found that *** essential oil showed moderate larvicidal activity against first instar larvae of *** with a LC50(50%lethal concentration)of 44.9 mg/L after 24 *** bioassays showed that *** essential oil exhibits moderate adulticidal activity against *** with a LC50 of 5.44%,while(-)-terpinen-4-ol showed significant adulticidal activity with a LC50 of 2.10%after 24 *** study verifies that the *** essential oil has mosquito repellent activity,and that(-)-terpinen-4-ol is mainly responsible for this ***,this study provides scientific support for the folk usage of *** essential oil as mosquito repellent and indicates that *** essential oil and(-)-terpinen-4-ol can be used as plant-derived repellents and insecticides for mosquito control.

关键词： Zingiber cassumunar Essential oil Repellent activity Larvicidal activity Adulticidal activity (-)-Terpinen-4-ol

Enhanced cyclic stability of partially disordered spinel cathodes through direct fluorination with gaseous fluorine

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Rare Metals 2024年第4期43卷 1635-1646页

作者： yong-Nian ma Ling-Chen Kong Shao-Shan Chen yong Wang Li-Dong Sun Cong peng Meng-Meng Qin Yu Li Wei Feng Tianjin Key Laboratory of Composite and Functional materials School of Materials Science and EngineeringTianjin UniversityTianjin300072China Institute of Advanced Technology and Equipment Beijing University of Chemical TechnologyBeijing100029China

Spinel-type cathodes are considered an optimal substitute for conventional layered oxide cathodes owing to their use of inexpensive and earth-abundant manganese as the redox-active ***,the introduction of cation disorder can effectively suppress the detrimental two-phase reaction to realize high capacities in a wide voltage ***,the continuous capacity decay during cycles has hindered the widespread application of these cathode *** fluorides exhibit excellent electrochemical stability at high voltage;therefore,in this study,the direct F2 gas reaction with a partially disordered spinel cathode(Li_(1.6)Mn_(1.6)O_(3.7)F_(0.3,)LMOF1.6)was initially applied to investigate the impacts of fluorination on the surface structure and electrochemical *** inorganic fluorinated layer,mainly containing LiF,was distributed uniformly on the surface of LMOF1.6nanoparticles after fluorination for an appropriate time without the turbulence caused by the valency of manganese cation,which improved the capacity retention and rate capability by the suppression of structural damage,parasitic reaction,and cation *** LMOF1.6cathode fluorinated for 0.5 h exhibited a capacity of283.6 mah·g^(-1)at 50 ma·g^(-1)and an enhanced capacity retention of 29.6%after 50 cycles in the voltage range of1.5-4.8 V,as compared to the pristine LMOF1.6 with only27.9%capacity retention.

关键词： Spinel-type cathodes Direct fluorination Capacity retention ability High rate capability

A Deep Deterministic Policy Gradient-Based Method for Enforcing Service Fault-Tolerance in MEC

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Chinese Journal of Electronics 2024年第4期33卷 899-909页

作者： Tingyan LONG peng CHEN Yunni XIA yong ma Xiaoning SUN Jiale ZHAO Yifei LYU College of Computer Science Chongqing University School of Computer and Software Engineering Xihua University School of Computer and Information Engineering Jiangxi Normal University School of Computer and Information Science Chongqing Normal University

Mobile edge computing(MEC) provides edge services to users in a distributed and on-demand *** to the heterogeneity of edge applications, deploying latency and resource-intensive applications on resourceconstrained devices is a key challenge for service providers. This is especially true when underlying edge infrastructures are fault and error-prone. In this paper, we propose a fault tolerance approach named DFGP, for enforcing mobile service fault-tolerance in MEC. It synthesizes a generative optimization network(GON) model for predicting resource failure and a deep deterministic policy gradient(DDPG) model for yielding preemptive migration *** show through extensive simulation experiments that DFGP is more effective in fault detection and guaranteeing quality of service, in terms of fault detection accuracy, migration efficiency, task migration time, task scheduling time,and energy consumption than other existing methods.

关键词： Fault tolerance Multi-access edge computing Processor scheduling Fault detection Image edge detection Fault tolerant systems Quality of service

Epigenetic regulation of SARS-Cov-2 spike protein modulates cellular viability and nascent RNA transcription in neuronal cells

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Genes & Diseases 2024年第2期11卷 535-538页

作者： Xi Kong peng Lu Jinyue Zhang Zheng Bao Chenghao Kuang Bingqing Xie Jianhua peng Ning ma yong Jiang Shigang Yin Laboratory of Neurological Diseases and Brain Function The Affiliated Hospital of Southwest Medical UniversityLuzhouSichuan 646000China Institute of Epigenetics and Brain Science Southwest Medical UniversityLuzhouSichuan 646000China Department of Neurosurgery The Affiliated Hospital of Southwest Medical UniversityLuzhouSichuan 646000China Inflammation and Allergic Diseases Research Unit The Affiliated Hospital of Southwest Medical UniversityLuzhouSichuan 646000China

SARS-CoV-2 has been demonstrated to be highly susceptible to neuron-and glial-like cells,1 but there is no consensus regarding how the virus affects neurons following *** is therefore unknown if and how SARS-CoV-2 maintains the homeostasis of neuronal ***,we revealed that the receptor-binding domain(RBD)of the SARS-CoV-2 spike protein acted as an extracellular remodeling component to undermine epigenetic regulation,perturbnascentRNA(nsRNA)transcription,promote mitochondrial biogenesis,and increase cellular viability in SH-SY5Y cells.

关键词： invasion homeostasis maintain

Guaranteed Cost Attitude Tracking Control for Uncertain Quadrotor Unmanned Aerial Vehicle Under Safety Constraints

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1447-1457页

作者： Qian ma peng Jin Frank L.Lewis School of Automation Nanjing University of Science and TechnologyNanjing 210094China UTA Research Institute University of Texas at ArlingtonFort WorthTexas 76118 USA IEEE

In this paper,guaranteed cost attitude tracking con-trol for uncertain quadrotor unmanned aerial vehicle(QUAV)under safety constraints is ***,an augmented system is constructed by the tracking error system and reference *** transformation aims to convert the tracking control prob-lem into a stabilization control ***,control barrier function and disturbance attenuation function are designed to characterize the violations of safety constraints and tolerance of uncertain disturbances,and they are incorporated into the reward function as penalty *** on the modified reward function,the problem is simplified as the optimal regulation problem of the nominal augmented system,and a new Hamilton-Jacobi-Bellman equation is ***,critic-only rein-forcement learning algorithm with a concurrent learning tech-nique is employed to solve the Hamilton-Jacobi-Bellman equa-tion and obtain the optimal *** proposed algorithm can not only ensure the reward function within an upper bound in the presence of uncertain disturbances,but also enforce safety *** performance of the algorithm is evaluated by the numerical simulation.

关键词： Attitude tracking control quadrotor unmanned aerial vehicle(QUAV) reinforcement learning safety constraints uncertain disturbances.