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Interspecific competition predicts the potential impact of little fire ant Wasmannia auropunctata (Roger) (Hymenoptera: Formicidae) invasion on resident ants in southern China

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Insect Science 2023年第5期30卷 1518-1532页

作者： Lei Nie Bamisope steve Bamisile Yuling Li Hao Ran Suhang Wang Lei Wang Yijuan Xu Red Imported Fire Ant Research Center South China Agricultural UniversityGuangzhouChina

The little fire ant Wasmannia auropunctata(Roger)is a major invasive species that seriously threatens the biodiversity of invaded *** was first reported in Chinese mainland in 2022 and its impact on native species is still *** evaluate the impact of *** invasion on the ant communities in southern China,a series of interspecific competition experiments were conducted in this *** individual aggression index and group aggression experiments showed the advantage of *** in competition with 5 resident ants under equal worker *** encountering Anoplolepis gracilipes,Camponotus nicobarensis,Tetramorium bicarinatum,Polyrhachis dives,and Solenopsis invicta,*** gradually gained a competitive advantage with an increase in its number of *** the group aggression experiments with equal worker numbers,there was a negative correlation between the body length and mortality rate of resident *** results of the foraging behavior experiments showed that *** was able to dominate food resources under competition with Carebara diversa,which also displayed weak competition in the group aggression *** addition,the abilities to recruit workers and retrieve food were inhibited under competition with *** and *** results of the nesting behavior experiments showed that in the 24-h bout of space resource competition,*** was dominant over ***,***,and *** results of this study show that *** has certain advantages in competition for food and space resources over resident ants in southern China,and some resident ant species may be replaced in the future.

关键词： aggression foraging competition interspecific competition nesting compe-tition W.auropunctata

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Genetic Interactions Reveal that Speci c Defects of Chloroplast Translation are Associated with the Suppression of var2-Mediated Leaf Variegation

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Journal of Integrative Plant Biology 2013年第10期55卷 979-993页

作者： Xiayan Liu Mengdi Zheng Rui Wang Ruijuan Wang Lijun An steve R.Rodermel Fei Yu State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences Northwest A&F University Department of Genetics Development and Cell Biology Iowa State University

Arabidopsis thaliana L. yellow variegated （var2） mutant is defective in a chloroplast FtsH family metalloprotease, AtFtsH2/VAR2, and displays an intriguing green and white leaf variegation. This unique var2-mediated leaf variegation offers a simple yet powerful tool for dissecting the genetic regulation of chloroplast development. Here, we report the isolation and characterization of a new var2 suppressor gene, SUPPRESSOR OF VARIEGA TION8 （SVR8）, which encodes a putative chloroplast ribosomal large subunit protein, L24. Mutations in SVR8 suppress var2 leaf variegation at ambient temperature and partially suppress the cold-induced chlorosis phenotype of var2. Loss of SVR8 causes unique chloroplast rRNA processing defects, particularly the 23S-4.5S dicistronic precursor. The recovery of the major abnormal processing site in svr823S-4.5S precursor indicate that it does not lie in the same position where SVR8/L24 binds on the ribosome. Surprisingly, we found that the loss of a chloroplast ribosomal small subunit protein, $21, results in aberrant chloroplast rRNA processing but not suppression of var2 variegation. These findings suggest that the disruption of specific aspects of chloroplast translation, rather than a general impairment in chloroplast translation, suppress var2variegation and the existence of complex genetic interactions in chloroplast development.

关键词： Chloroplast ribosomal protein L24 chloroplast rRNA processing genetic suppressor leaf variegation var2.

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New Opportunities for Lanthanide Luminescence

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Journal of Rare Earths 2007年第3期25卷 257-274页

作者： Jean-Claude G. Bünzli steve Comby Anne-Sophie Chauvin Caroline D. B. Vandevyver Laboratory of Lanthanide Supramolecular Chemistry Ecole Polytechnique Fédérale de Lausanne BCH 1402 CH-1015 Lausanne Switzerland

Trivalent lanthanide ions display fascinating optical properties. The discovery of the corresponding elements and their first industrial uses were intimately linked to their optical properties. This relationship has been kept alive until today when many high-technology applications of lanthanide-containing materials such as energy-saving lighting devices, displays, optical fibers and amplifiers, lasers, responsive luminescent stains for biomedical analyses and in cellulo sensing and imaging, heavily rely on the brilliant and pure-color emission of lanthanide ions. In this review we first outlined the basics of lanthanide luminescence with emphasis on f-f transitions, the sensitization mechanisms, and the assessment of the luminescence efficiency of lanthanide-containing emissive molecular edifices. Emphasis was then put on two fast developing aspects of lanthanide luminescence： materials for telecommunications and light emitting diodes, and biomedical imaging and sensing. Recent advances in NIR-emitting materials for plastic amplifiers and waveguides were described, together with the main solutions brought by researchers to minimize non-radiative deactivation of excited states. The demonstration in 1999 that erbium tris（8-hydroxyquinolinate） displayed a bright green emission suitable for organic light emitting diodes （OLEDs） was followed by realizing that in OLEDs, 25% of the excitation energy leads to singlet states and 75% to triplet states. Since lanthanide ions are good triplet quenchers, they now also play a key role in the development of these lighting devices. Luminescence analyses of biological molecules are among the most sensitive analytical techniques known. The long lifetime of the lanthanide excited states allows time-resolved spectroscopy to be used, suppressing the sample autofluorescence and reaching very low detection limits. Not only visible lanthanide sensors are now ubiquitously provided in medical diagnosis and in cell imaging, but the feasibili

关键词： lanthanide luminescence sensitization near infrared telecommunications organic light emitting diode (OLED) time-resolved luminescence in cellulo sensing cell imaging rare earths

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辉光放电质谱法测定超高纯铜中痕量杂质的记忆效应研究

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冶金分析 2011年第9期31卷 22-23页

作者： GUILFOYLE steve Nu仪器公司

随着高纯材料的需求日益增大,分析这种材料的辉光放电质谱技术也在不断的完善,其中一个困扰业界的问题就是记忆效应。本文采用辉光放电质谱法在分析锌样品前后分别两次测定了超高纯铜样品中10种痕量杂质(Mg、Al、Cr、Mn、Fe、Ni、Zn、As... 详细信息

随着高纯材料的需求日益增大,分析这种材料的辉光放电质谱技术也在不断的完善,其中一个困扰业界的问题就是记忆效应。本文采用辉光放电质谱法在分析锌样品前后分别两次测定了超高纯铜样品中10种痕量杂质(Mg、Al、Cr、Mn、Fe、Ni、Zn、As、Hg、Pb)。结果表明,两次测定结果基本一致,尤其是两次测定所得痕量锌含量结果一致,说明改变样品基体时,采用只清洗辉光放电池的方法可消除记忆效应。

关键词：超高纯铜辉光放电质谱法记忆效应

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Indoleamine 2,3-dioxygenase (IDO) is essential for dendritic cell activation and chemotactic responsiveness to chemokines

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Cell Research 2005年第3期15卷 167-175页

作者： Shih Ling HWANG,Nancy Pei-Yee CHUNG,Jacqueline Kwai-Yi CHAN,Chen-Lung steve LIN Department of Surgery Kaohsiung Medical University Kaohsiung Taiwan China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China

Indoleamine 2, 3-dioxygenase (IDO) is a rate-limiting enzyme for the tryptophan catabolism. In human and murine cells, IDO inhibits antigen-specific T cell proliferation in vitro and suppresses T cell responses to fetal alloantigens during murine pregnancy. In mice, IDO expression is an inducible feature of specific subsets of dendritic cells (DCs), and is important for T cell regulatory properties. However, the effect of IDO and tryptophan deprivation on DC func- tions remains unknown. We report here that when tryptophan utilization was prevented by a pharmacological inhibitor of IDO, 1-methyl tryptophan (1MT), DC activation induced by pathogenic stimulus lipopolysaccharide (LPS) or inflam- matory cytokine TNF-α was inhibited both phenotypically and functionally. Such an effect was less remarkable when DC was stimulated by a physiological stimulus, CD40 ligand. Tryptophan deprivation during DC activation also regu- lated the expression of CCR5 and CXCR4, as well as DC responsiveness to chemokines. These results suggest that tryptophan usage in the microenvironment is essential for DC maturation, and may also play a role in the regulation of DC migratory behaviors.

关键词： Indoleamine 2 3-dioxygenase (IDO) dendritic cells activation T cell tryptophan chemokine.

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Shift current bulk photovoltaic effect in polar materials—hybrid and oxide perovskites and beyond

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npj Computational Materials 2016年第1期2卷 58-69页

作者： Liang Z Tan Fan Zheng steve M Young Fenggong Wang Shi Liu Andrew M Rappe The Makineni Theoretical Laboratories Department of ChemistryUniversity of PennsylvaniaPhiladelphiaPAUSA Center for Computational Materials Science United States Naval Research LaboratoryWashingtonDCUSA Geophysical Laboratory Carnegie Institution of ScienceWashingtonDCUSA

The bulk photovoltaic effect(BPVE)refers to the generation of a steady photocurrent and above-bandgap photovoltage in a single-phase homogeneous material lacking inversion *** mechanism of BPVE is decidedly different from the typical p-n junction-based photovoltaic mechanism in heterogeneous ***,there has been renewed interest in ferroelectric materials for solar energy conversion,inspired by the discovery of above-bandgap photovoltages in ferroelectrics,the invention of low bandgap ferroelectric materials and the rapidly improving power conversion efficiency of metal halide ***,as long as the nature of the BPVE and its dependence on composition and structure remain poorly understood,materials engineering and the realisation of its true potential will be *** this review article,we survey the history,development and recent progress in understanding the mechanisms of BPVE,with a focus on the shift current mechanism,an intrinsic BPVE that is universal to all materials lacking inversion *** addition to explaining the theory of shift current,materials design opportunities and challenges will be discussed for future applications of the BPVE.

关键词： mechanism effect ferroelectric

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页岩油气富集的主控因素及误辩:以美国、阿根廷和中国典型页岩为例

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地球科学（中国地质大学学报） 2017年第7期42卷 1083-1091页

作者：蒋恕唐相路 steve Osborne Thomas Anderson 犹他大学能源与地球科学学院美国盐湖城84108 中国地质大学资源学院湖北武汉430074 中国石油大学非常规天然气研究院北京102249 中国石油大学非常规油气与新能源研究院山东青岛266580

页岩气富集不均匀,无论对于不同页岩油气藏还是同一页岩油气藏不同地方,产量都是有高有低.有必要系统分析和对比全球不同页岩油气的地质、石油系统与油气富集的关系,总结页岩油气富集的主控因素,从而采取合理的勘探和开发技术.以美国、... 详细信息

页岩气富集不均匀,无论对于不同页岩油气藏还是同一页岩油气藏不同地方,产量都是有高有低.有必要系统分析和对比全球不同页岩油气的地质、石油系统与油气富集的关系,总结页岩油气富集的主控因素,从而采取合理的勘探和开发技术.以美国、阿根廷和中国典型页岩为例,基于野外和岩心观察、样品属性测试分析、储层表征、石油系统分析及油气测试,探究了页岩油气富集的主控因素及存在的认识误区.结果表明,富含有机质和脆性矿物的页岩主要分布于远离造山带物源的非深水的沉积和构造背景,富含石英和高伽马页岩并非判断优质储层的矿物和岩石物理标准,优质碳酸盐页岩应以富含碳酸盐和低伽马值为标准."页岩油气藏"实际是细粒富含有机质的自生自储或与富含有机质烃源岩相邻的贫有机质细粒沉积储层.天然裂缝对页岩油气富集具有有利和不利的双重作用.因此,页岩油气富集同时受到沉积和构造环境、岩相及矿物组成、天然裂缝的耦合影响,且对不同沉积盆地、不同属性页岩的影响差异明显.

关键词：页岩油气富集沉积背景构造岩相矿物组成天然裂缝石油地质

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锚杆锚固体系中的固结波速研究

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岩石力学与工程学报 2009年第A2期28卷 3604-3608页

作者：张昌锁李义 ZOU steve 太原理工大学矿业工程学院山西太原030024 达尔豪西大学土木与资源工程学院

采用理论分析、数值模拟和实验室测试对不同锚固质量锚杆中的应力波在锚固段的传播速度进行分析。模拟试验中采用不同龄期的混凝土模拟不同锚固强度,数值模拟中通过改变弹性模量和泊松比实现改变锚固强度。数值模拟和试验模拟结果定性吻... 详细信息

采用理论分析、数值模拟和实验室测试对不同锚固质量锚杆中的应力波在锚固段的传播速度进行分析。模拟试验中采用不同龄期的混凝土模拟不同锚固强度,数值模拟中通过改变弹性模量和泊松比实现改变锚固强度。数值模拟和试验模拟结果定性吻合;都显示锚杆中锚固段的应力波波速(固结波速)和锚固介质的强度直接相关,固结波速和锚固介质强度之间成抛物线关系。起初固结波速随锚固介质强度的增加而减少,到达最底点后随着锚固介质强度的增加而增加。用数值模拟结果对产生这种现象的本质原因进行分析讨论。模拟显示固结波速随锚固介质强度的变化是由锚杆中的P波以及锚杆和锚固介质界面处产生的界面波此消彼长而引起的。

关键词：岩石力学固结波速无损检测锚固质量

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UNIX系统编程

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作者： (美)Kay A. Robbins (美)steve Robbins

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Diversity in global gene expression and morphology across a watercress (Nasturtium officinale R. Br.) germplasm collection: first steps to breeding

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Horticulture Research 2015年第1期2卷 175-182页

作者： Adrienne C.Payne Graham J.J.Clarkson steve Rothwell Gail Taylor Centre for Biological Sciences Institute for Life SciencesUniversity of SouthamptonSouthamptonSO171BJUK Vitacress Salads Ltd Lower Link FarmSt Mary BourneAndoverHampshireSP116DBUK

Watercress(Nasturtium officinale ***.)is a nutrient intense,leafy crop that is consumed raw or in soups across the globe,but for which,currently no genomic resources or breeding programme *** morphological,biochemical and functional genomic variation was identified for the first time in a newly established watercress germplasm collection,consisting of 48 watercress accessions sourced from contrasting global *** length,stem diameter and anti-oxidant(AO)potential varied across the *** variation was used to identify three extreme contrasting accessions for further *** in global gene expression was investigated using an Affymetrix Arabidopsis ATH1 microarray gene chip,using the commercial control(C),an accession selected for dwarf phenotype with a high AO potential(dwarfAO,called‘Boldrewood’)and one with high AO potential alone.A set of transcripts significantly differentially expressed between these three accessions,were identified,including transcripts involved in the regulation of growth and development and those involved in secondary *** particular,when differential gene expression was compared between C and dwarfAO,the dwarfAO was characterised by increased expression of genes encoding glucosinolates,which are known precursors of phenethyl isothiocyanate,linked to the anti-carcinogenic effects well-documented in *** study provides the first analysis of natural variation across the watercress genome and has identified important underpinning information for future breeding for enhanced anti-carcinogenic properties and morphology traits in this nutrient-intense crop.

关键词： breeding dwarf germplasm

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