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Phyllosphere eukaryotic microalgal communities in rainforests:Drivers and diversity

Plant Diversity 2023年第1期45卷 45-53页

作者： Ben-wen liu Shu-Yin li Huan Zhu Guo-Xiang liu Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration BureauMinistry of Ecological EnvironmentWuhan 430072China

Phyllosphere algae are common in tropical rainforests,forming visible biofilms or spots on plant leaf ***,knowledge of phyllosphere algal diversity and the environmental factors that drive that diversity is *** aim of this study is to identify the environmental factors that drive phyllosphere algal community composition and diversity in *** this purpose,we used single molecule real-time sequencing of full-length 18S rDNA to characterize the composition of phyllosphere microalgal communities growing on four host tree species(Ficus tikoua,Caryota mitis,Arenga pinnata,and Musa acuminata) common to three types of forest over four months at the Xishuangbanna Tropical Botanical Garden,Yunnan Province,*** 18S rDNA sequences revealed that the green algae orders Watanabeales and Trentepohliales were dominant in almost all algal communities and that phyllosphere algal species richness and biomass were lower in planted forest than in primeval and reserve *** addition,algal community composition differed significantly between planted forest and primeval *** also found that algal communities were affected by soluble reactive phosphorous,total nitrogen,and ammonium *** findings indicate that algal community structure is significantly related to forest type and host tree ***,this study is the first to identify environmental factors that affect phyllosphere algal communities,significantly contributing to future taxonomic research,especially for the green algae orders Watanabeales and *** research also serves as an important reference for molecular diversity analysis of algae in other specific habitats,such as epiphytic algae and soil algae.

关键词： Full-length 18S rDNA sequences Cryptic diversity Environmental factors High-throughput sequence Phyllosphere algae Tropical rainforest

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A new understanding of the effect of Cr on the corrosion resistance evolution of weathering steel based on big data technology

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Journal of Materials Science & Technology 2022年第9期104卷 67-80页

作者： Xiaojia Yang Ying Yang Meihui Sun Jinghuan Jia Xuequn Cheng Zibo Pei qing li Di Xu Kui Xiao Xiaogang li Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China State Key Laboratory of Metal Material for Marine Equipment and Application AnsteelAnshan 114021China

In this work,we studied the effect of Cr element on the corrosion resistance evolution of weathering steel based on corrosion big data *** suggested that corrosion big data technology is suitable for evaluation of the effect of microalloying Cr element on the corrosion evolution behavior of weathering *** understandings prove that the effect of Cr on the corrosion process is dynamic rather than static,the processes is affected by both of the environmental factors and the electrochemical or chemical reactions in the rust ***,Cr element has both beneficial effect and detrimental effect on the corrosion resistance of weathering *** beneficial effect is that the general corrosion resistance of Cr-additional steel is better than that of Cr-free steel,while the detrimental effect is that localized corrosion is intensified as the increase of Cr content in the Cr-additional steel.

关键词： Weathering steel Cr-addition Big data Atmospheric corrosion

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Controls of accommodation to sediment-supply ratio on sedimentary architecture of continental fluvial successions

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Petroleum Science 2023年第4期20卷 1961-1977页

作者： Wei li Da-li Yue Yu-Shan Du Jian li Chi Zhang Zhi-Qiang Gong Xue-Ting Zhang qing-lin Shu Jian Gao National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Shengli Oil Field Company SINOPECDongyingShandong257015China PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China

The applicability of sequence stratigraphic models to continental fluvial successions has long been topic for debate. To improve our understanding of how fluvial architectures record responses to changes in the ratio between accommodation rate and sediment-supply rate (A/S), two case studies are analyzed, including a densely drilled subsurface fluvial reservoir imaged with a seismic cube, and an outcropping fluvial succession. The subsurface dataset provides a larger, three-dimensional perspective, whereas the outcrop dataset enables observation at higher resolution. On the basis of both datasets, channel-body density, channel-body stacking patterns and their formative river types are interpreted at different scales, and how these may reflect responses to A/S change (the rate of accommodation creation relative to the rate of sediment supply) are discussed. The results indicate that (i) channel-body stacking patterns undergo four evolutionary stages along with the A/S increase, i.e., multi-story, mixed multi- and two-story, two-story, and isolated patterns;(ii) channel-body density decreases along with the channel-body stacking patterns varying from multi-story to isolated;(iii) formative rivers types are interpreted as evolving from braided planforms to braided-meandering planforms and then to meandering ones, with the increase of A/S.

关键词： Channel body Sedimentary architecture Stacking pattern Formative river type Sequence stratigraphy A/S

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Effect of groove rolling on the microstructure and properties of Cu–Nb microcomposite wires

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 279-284页

作者： Peng-fei Wang Ming liang Xiao-yan Xu Jian-qing Feng Cheng-shan li Ping-xiang Zhang Jin-shan li School of Materials Northwestern Polytechnical UniversityXi’an 710072China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

Cu–Nb microcomposite wire was successfully prepared by a groove rolling *** effects of groove rolling on the diffraction peaks,microstructure,and properties of the Cu–Nb microcomposite were investigated and the microstructure evolutions and strengthening mechanism were *** tensile strength of the Cu–Nb microcomposite wire with a diameter of 2.02 mm was greater than 1 GPa,and its conductivity reached 68%of the International Annealed Copper Standard,demonstrating the Cu–Nb microcomposite wire with high tensile strength and high conductivity after groove *** results show that an appropriate groove rolling method can improve the performance of the Cu–Nb microcomposite wire.

关键词： groove rolling microstructure strengthening mechanism copper-niobium microcomposites

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Cu/Cu2O nanostructures derived from copper oxalate as high performance electrocatalyst for glucose oxidation

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Chinese Chemical Letters 2020年第7期31卷 1941-1945页

作者： Guoqiang Yuan Shangkui Yu Ji Jie Chen Wang qing li Huan Pang Guangling College Yangzhou UniversityYangzhou 225009China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China

Porous nanomaterials are classified as a kind of materials with great potential for development in the field of electrocatalysis,but there is still room for further improve ment as *** develop a threedimensional(3D)porous structure of Cu/Cu2O as an electrocatalyst for the glucose oxidation reaction(GOR)using the method of calcining the precursor CuC2O4·2H2O in *** obtained porous Cu/Cu2O nanostructure can provide more opportunities for effective reactions between particles,which can explain their efficient electrocatalytic ***,the as-synthesized Cu/Cu2O nanostructure exhibits outstanding electrocatalytic performance for the glucose,including good stability,excellent sensitivity and remarkable selectivity.

关键词： Copper oxalate Cu/Cu2O Electrocatalysis Glucose Porous

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Berberine improves central memory formation of CD8^(+)T cells:Implications for design of natural product-based vaccines

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Acta Pharmaceutica Sinica B 2023年第5期13卷 2259-2268页

作者： Mingyan li Yaling Wang lingzhi Zhang Changxing Gao Jing Jli Jiandong Jiang qing Zhu State Key Laboratory of Bioactive Substance and Function of Natural Medicines and Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation StudyChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China College of Chinese Materia Medica and Yunnan Key Laboratory of Southern Medicinal Utilization Yunnan University of Chinese MedicineYunnan 650500China

Berberine(BBR)as one of the most effective natural products has been increasingly used to treat various chronic diseases due to its immunosuppressive/tolerogenic ***,it is unknown if BBR can be applied without abrogating the efforts of *** we show that priming of CD8^(+)T cells in the presence of BBR lead to improved central memory formation(Tcm)with substantially reduced effector proliferation,primarily orchestrated through activation of AMPK and *** derived from vaccinated mice fed with BBR were able to adoptively transfer protective immunity to naIve *** of BBR-fed mice conferred better memory protection against infection without losing immediate effector efficacy,suggesting appreciable benefits from using BBR in ***,our study may help to lay the groundwork for mechanistic understanding of the immunomodulatory effects of natural products and their potential use as adjuvant that allows the design of novel vaccines with more desirable properties.

关键词： Berberine CD8^(+)T cell T cell priming Central memory AMPK Stat5 Vaccine design Naturally occurring compound

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Dynamic Analysis of Semi-Submersible Production Platform Under the Failure of Mooring lines

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China Ocean Engineering 2021年第1期35卷 84-95页

作者： CHUANG Zhen-ju liU She-wen li Chun-zheng LU Yu CHANG Xin Naval Architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China

This paper quantitatively studies the transient dynamic response of a semi-submersible production platform with the loss of one or several positioning mooring lines.A semi-submersible platform,production risers,and positioning mooring lines are all included in the numerical *** motion of the semi-submersible platform,tension variation of the remaining mooring lines/risers and the risk of mooring line or riser clashing are all investigated through fully coupled time-domain *** environmental loads are selected from irregular waves and the steady current varying from very rough to extreme sea *** dimension radiation/diffraction theories and Morison’s equation are applied to calculate first-order wave force and second-order mean drift force of floating semi-submersible *** time-domain finite element methods are employed to analyze the behavior of mooring lines and *** show that the failure of mooring lines seriously reduce the platform’s stability *** tension of the rest lines is also increased *** lines which are closer to the failed lines will have larger tension increase to ***-line distance provides practical information for the risk of clashing investigation.

关键词： mooring line failure the transient response of platform tension variation of mooring line risk of lines clashing coupling effect between platform and mooring system

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Physical properties and phase diagram of NaFe_(1-x)V_(x)As

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Chinese Physics B 2021年第1期30卷 100-103页

作者： Guang-Yang Dai Xin He Zhi-wen li Chang-ling Zhang Lu-Chuan Shi Run-Ze Yu Xian-Cheng Wang Chang-qing Jin Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Materials Research Laboratory at Songshan Lake Dongguan 523808China

We grew a series of NaFe_(1-x)V_(x) As(0 ≤ x ≤ 0.03) single crystals and performed the measurements of resistance,magnetic susceptibility, and specific heat to study the superconducting phase diagram by doping V into Na Fe As. Both the structural and the spin-density-wave(SDW) transitions are slightly suppressed by V-doping. While superconducting transition temperature is enhanced to the maximum value of 15 K when the optimal doping level x = 0.007 and then is suppressed rapidly with further V-doping, displaying a small superconducting dome. Our results suggest that V-impurities should act as strong magnetic scattering centers which cause the sharp suppression of superconductivity in NaFe_(1-x)V_(x) As.

关键词： iron based superconductor "111"type NaFeAs V doping phase diagram

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Waxy allele diversity in waxy maize landraces of Yunnan Province, China

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Journal of Integrative Agriculture 2022年第2期21卷 578-585页

作者： WU Xiao-yang LONG wen-jie CHEN Dan ZHOU Guo-yan DU Juan WU Shao-yun CAI qing Biotechnology and Germplasm Resources Institute Yunnan Academy of Agricultural SciencesKunming 650223P.R.China

Waxy maize is one of the main fresh-eating maize types,and a mutation of the waxy gene causes the waxy character of maize *** is rich in waxy maize landraces,and Yunnan and its surrounding areas,are the place of origin and genetic diversity center of Chinese waxy *** six known waxy alleles of Chinese waxy maize are wx-D7,wx-D10,wx-Cin4,wx-124,wx-Reina,and *** mutation sites of these alleles all occur in the coding region of the waxy gene,however,the mechanism by which the waxy characteristic is caused by the mutation in the regulatory region has only been reported rarely in *** this study,405 waxy maize landraces from Yunnan were used as materials to identify the insertion and deletion of a large sequence fragment in the upstream~3.5 kb regulatory region of the waxy gene by molecular marker *** different waxy alleles were identifed in this study:wx-PIF/Harbinger,wx-hAT and *** three types of mutations all represented transposons inserted into the regulatory region of the waxy ***-PIF/Harbinger was a 304-bp MITE class transposon insertion belonging to the PIF/Harbinger family,while wx-hAT was a 560-bp MITE class transposon insertion belonging to the hAT family,and wx-Elote2 was a 6560-bp LTR-like transposon *** this study,the alleles were identifed for more than 70%of the waxy maize landraces in Yunnan,which provids a basis for the utilization of these waxy maize landraces.

关键词： waxy maize landraces Waxy allele transposon gene regulatory region Yunnan

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A mini review on oxidative dehydrogenation of propane over boron nitride catalysts

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Petroleum Science 2023年第4期20卷 2488-2498页

作者： Zhu Fu De-Zheng li li-Dai Zhou Yu-Ming li Jia-wen Guo Yu-Qiao li Hui-Min liu Qi-Jian Zhang School of Chemical and Environmental Engineering Liaoning University of TechnologyJinzhouLiaoning121001China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China

Oxidative dehydrogenation of propane is an attractive route for the synthesis of propylene due to its favorable thermodynamic and kinetic characteristics, however, it is challenging to realize high selectivity towards propylene. Recently, it has been discovered that boron nitride (BN) is a promising catalyst that affords superior selectivity towards propylene in oxidative dehydrogenation of propane. Summarizing the progress and unravelling the reaction mechanism of BN in oxidative dehydrogenation of propane are of great significance for the rational design of efficient catalysts in the future. Herein, in this review, the underlying reaction mechanisms of oxidative dehydrogenation of propane over BN are extracted;the developed BN catalysts are classified into pristine BN, functionalized BN, supported BN and others, and the applications of each category of BN catalysts in oxidative dehydrogenation of propane are summarized;the challenges and opportunities on oxidative dehydrogenation of propane over BN are pointed out, aiming to inspire more studies and advance this research field.

关键词： Oxidative dehydrogenation of propane Boron nitride Propylene Reaction mechanism

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