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Vertically grown MoS_(2)nanosheets on graphene with defect-rich structure for efficient sodium storage

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Rare Metals 2024年第3期43卷 1062-1071页

作者： Ying Wang Jia-Peng He Han-qing Pan qing-Peng Wang Lei Zhang Yong-chang liu qing-Hong Wang School of Chemistry&Materials Science Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional MaterialsJiangsu Normal UniversityXuzhou221116China Institute of Biopharmaceutical Research Liaocheng UniversityLiaocheng252059China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China Centre for Catalysis and Clean Energy Gold Coast CampusGriffith UniversityGold CoastQLD4222Australia

The synthesis of a perpendicular growth structure of MoS_(2)nanosheets on graphene for efficient sodium storage is challenging yet ideal due to the benefits of open ion diffusion channels and high electronic *** this study,we have successfully fabricated a novel structure of vertical MoS_(2)nanosheets on graphene,with ZnS nanoparticles serving as bonding points(MoS_(2)/ZnS/G),through a facile hydrothermal *** the synthesis process,Zn^(2+)not only acts as a landing site for the vertical growth of MoS_(2)nanosheets but also triggers the formation of a defect-rich structure in the final *** unique architecture of MoS_(2)/ZnS/G effectively combines the advantages of a vertically aligned geometry and a defectrich structure for energy *** resulting structure displays shortened transport paths for electrons/ions,enhanced conductivity,improved structural integrity,and an increased number of active sites for promising electrochemical *** expected,when used as anode for sodium-ion batteries,the as-synthesize d MoS_(2)/ZnS/G exhibits excellent rate capability(high capacity of 298 mAh·g^(-1)at 5 A·g^(-1))and good cycling stability(a capacity decay of 0.056%per cycle after 500 cycles at 1 A·g^(-1)).According to the kinetic investigations,the electrochemical process of the MoS_(2)/ZnS/G sample is primarily governe d by a pseudocapacitive behavior,which enhances the charge/discharge kinetics and allows the MoS_(2)/ZnS/G structure to remain intact during cycling.

关键词： MoS_(2) Perpendicular growth Graphene Sodium storage Electrochemical performance

Cloning and Characterization of a Salt Tolerance-Associated Gene Encoding Trehalose-6-Phosphate Synthase in Sweetpotato

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Journal of Integrative Agriculture 2014年第8期13卷 1651-1661页

作者： JIANG Tao ZHAI Hong WANG Fei-bing ZHOU Hua-nan SI Zeng-zhi HE Shao-zhen liu qing-chang Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization Ministry of Education/College of Agriculture and Biotechnology China Agricultural University

Trehalose plays an important role in metabolic regulation and abiotic stress tolerance in a variety of organisms. In plants, its biosynthesis is catalyzed by two key enzymes： trehalose-6-phosphate synthase（TPS） and trehalose-6-phosphate phosphatase（TPP）. In the present study, a TPS gene, named IbTPS, was first isolated from sweetpotato（Ipomoea batatas（L.） Lam.） cv. Lushu 3 by rapid amplification of cDNA ends（RACE）. The open reading frame（ORF） contained 2 580 nucleotides encoding 859 amino acids with a molecular weight of 97.433 kDa and an isoelectric point（pI） of 5.7. The deduced amino acid sequence showed high identities with TPS of other plants. Real-time quantitative PCR analysis revealed that the expression level of IbTPS gene was significantly higher in stems of Lushu 3 than in its leaves and roots. Subcellular localization analysis in onion epidermal cells indicated that IbTPS gene was located in the nucleus. Transgenic tobacco（cv. Wisconsin 38） plants over-expressing IbTPS gene exhibited significantly higher salt tolerance compared with the control plant. Trehalose and proline content was found to be significantly more accumulated in transgenic tobacco plants than in the wild-type and several stress tolerance related genes were up-regulated. These results suggest that IbTPS gene may enhance salt tolerance of plants by increasing the amount of treahalose and proline and regulating the expression of stress tolerance related genes.

关键词： cloning IbTPS gene Ipomoea batatas(L.) Lam. salt tolerance

Identification of QTLs for Starch Content in Sweetpotato(Ipomoea batatas(L.) Lam.)

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Journal of Integrative Agriculture 2014年第2期13卷 310-315页

作者： YU Xiao-xia ZHAO Ning LI Hui JIE Qin ZHAI Hong HE Shao-zhen LI Qiang liu qing-chang Laboratory of Crop Heterosis and Utilization Ministry of Education/Beijing Key Laboratory of Crop Genetic Improvement/China Agricultural University Xuzhou Sweetpotato Research Center

Sweetpotato （Ipomoea batatas （L.） Lam.） breeding is challenging due to its genetic complexity. In the present study, interval mapping （IM） and multiple quantitative trait locus （QTL） model （MQM） analysis were used to identify QTLs for starch content with a mapping population consisting of 202 F1 individuals of a cross between Xushu 18, a cultivar susceptible to stem nematodes, with high yield and moderate starch, and Xu 781, which is resistant to stem nematodes, has low yield and high starch content. Six QTLs for starch content were mapped on six linkage groups of the Xu 781 map, explaining 9.1-38.8% of the variation. Especially, one of them, DMFN 4, accounted for 38.8% of starch content variation, which is the QTL that explains the highest phenotypic variation detected to date in sweetpotato. All of the six QTLs had a positive effect on the variation of the starch content, which indicated the inheritance derived from the parent Xu 781. Two QTLs for starch content were detected on two linkage groups of the Xushu 18 map, explaining 14.3 and 16.1% of the variation, respectively. They had a negative effect on the variation, indicating the inheritance derived from Xu 781. Seven of eight QTLs were co-localized with a single marker. This is the first report on the development of QTLs co-localized with a single marker in sweetpotato. These QTLs and their co-localized markers may be used in marker-assisted breeding for the starch content of sweetpotato.

关键词： co-localized marker lpomoea batatas (L.) Lam. QTLs starch content

Characterization of a Novel Chlorophyll-Deficient Mutant Mt6172 in Wheat

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Journal of Integrative Agriculture 2012年第6期11卷 888-897页

作者： GUO Hui-jun ZHAO Hong-bing ZHAO Lin-shu GU Jia-yu ZHAO Shi-rong LI Jun-hui liu qing-chang liu Lu-xiang Key Laboratory of Crop Genomics and Genetic Improvement Ministry of Agriculture/Beo'ing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100193 P.R.China National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China

Identification of new chlorophyll-deficient mutants will provide materials for studying signaling components and pathways between plastid and nucleus. A novel chlorophyll-deficient mutant, named Mt6172, was obtained by spaceflight environment induction. Genetic analysis showed that its inheritance was controlled by nuclear and cytoplamic genes. Leaf color of its self-fertilized progenies was albino, narrow-white striped, or green. Only a few cells with abnormal chloroplasts were observed in albino plants and white section of narrow-white striped plants. These chloroplasts had obvious flaws in inner structure, and granum lamellae was extremely disordered. The narrow-white striped plants were characterized with green- and-narrow-white striped leaves, and the width of stripes between different plants was even, their plant height, number of productive tillers, and 1 000-grain weight were lower than those of the wild type. The narrow-white striped plants and the wild type had significant difference in the value of potential activity of photosystem II at all tested stages. At elongation stage, which was impacted the most seriously, effective quantum yield significantly decreased, whereas the energy for photoprotection and photodamage significantly increased. changes of electron transport rate, photochemical dissipation, Under different photosynthetic active radiation conditions, and effective quantum yield were different, electron transport rate was more impacted than other parameters. Therefore, the leaf morphology and inheritance of mutant Mt6172 was different from the other reported mutants in wheat, and it was a novel mutant of chloroDhvll deficiency.

关键词： Triticum aestivum L. space mutagenesis chlorophyll-deficient mutant agronomic traits chloroplastultrastructure

Generic Modeling and Control Framework for Power Systems Dominated by Power Converters Connected Through a Passive Transmission and Distribution Grid

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 292-301页

作者： qing-chang Zhong Marcio Stefanello Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA Syndem LLC USA.M.Stefanello is with the Fundacao Universidade Federal do Pampa at AlegreteRS97546-550Brazil

In this paper,a compact mathematical model having an elegant structure,together with a generic control framework,are proposed for generic power systems dominated by power converters that are interconnected through a passive transmission and distribution(T&D)grid,by adopting the port-Hamiltonian(pH)systems theory and the fundamental circuit *** models of generic T&D lines are developed and then the model of a generic T&D grid is *** the proposed control framework,the controlled converters are proven to be passive and Input-to-State Stable(ISS).The compact mathematical model is scalable and can be applied to power systems with multiple power electronic converters with generic passive controllers,passive local loads,and different types of passive T&D lines connected in a meshed configuration without self-loops,so it is very ***,the resulting power system is proven to be ISS as *** analysis is carried out without assumptions on constant frequency/voltage,constant loads,and/or lossless networks,except the need of passivity for all parts involved,and without using the Clarke/Park transformations or the graph *** simplify the presentation,three-phase balanced systems are adopted but the results can be easily adapted for single-phase or unbalanced three-phase systems.

关键词： Input-to-State Stable(ISS) passivity,portHamiltonian(pH)systems Power electronic converters dominated power systems Synchronized and Democratized(SYNDEM)grid architecture

Explicitness and implicitness of utterances

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Sino-US English Teaching 2007年第6期4卷 45-48,53页

作者： liu chang-qing School of Foreign Languages Langfang Teachers College Langfang 065000 China

Three pragmatic theories in terms of two properties of utterance-explicitness and implicitness are surveyed, with a general commentary and a proposal of further development in the study of explicitness and implicitnes... 详细信息

关键词： pragmatics communication utterance explicitness implicitness

双烯丙醇一锅法合成的有机化学综合实验教学设计

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贵州师范学院学报 2024年第6期40卷 68-75页

作者：刘长青李慧娟张恩立袁明薛洪宝蚌埠医科大学药物合成教研室安徽蚌埠233030

结合课题组的前期研究成果,介绍了一个格氏试剂、炔基砜和查尔酮的一锅法合成双烯丙醇的有机化学综合实验教学设计。产物结构经过^(1)H NMR、^(13)C NMR和HRMS表征,并通过自动熔点仪测定出产物的熔点。实验中涉及格氏试剂的制备以及化... 详细信息

结合课题组的前期研究成果,介绍了一个格氏试剂、炔基砜和查尔酮的一锅法合成双烯丙醇的有机化学综合实验教学设计。产物结构经过^(1)H NMR、^(13)C NMR和HRMS表征,并通过自动熔点仪测定出产物的熔点。实验中涉及格氏试剂的制备以及化学性质的研究,丰富了有机化学实验的教学内容。将科研成果融入到有机化学综合实验教学中,不仅能够锻炼学生的综合实验技能和提高学习兴趣,而且能够拓宽学生的科学研究视角和激发学生的创新思维能力;同时,这也能为学生本科毕业论文设计的开展打下扎实的基础。

关键词：教学设计有机化学综合实验格氏试剂炔基砜查尔酮双烯丙醇

Wide‑field swept‑source OCT angiography of the periarterial capillary‑free zone before and after anti‑VEGF therapy for branch retinal vein occlusion

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Eye and Vision 2024年第2期10卷 31-40页

作者： Wenyi Tang Wei liu Jingli Guo Lili Zhang Gezhi Xu Keyan Wang qing chang Department of Ophthalmology Eye and ENT Hospital of Fudan University83 Fenyang RoadShanghai 200031China Shanghai Key Laboratory of Visual Impairment and Restoration Fudan UniversityShanghaiChina NHC Key Laboratory of Myopia(Fudan University) Laboratory of MyopiaChinese Academy of Medical SciencesShanghaiChina

Background:The aim of the study was to investigate the changes in the periarterial capillary-free zone(paCFZ)after anti-vascular endothelial growth factor(VEGF)therapy in patients with branch retinal vein occlusion(BRVO)by widefield swept-source optical coherence tomography angiography(SS-OCTA)and assess their associations with clinical ***:In this retrospective observational study of 54 treatment-naive BRVO patients with macular edema,we reviewed the findings of 12×12 mm^(2)SS-OCTA at baseline,3,6,and 12 months after intravitreal ranibizumab *** paCFZ and major retinal artery areas were measured on SS-OCTA *** paCFZ area to artery area(P/A)ratio was ***:The paCFZ areas and P/A ratios of first-and second-order arteries were significantly greater in BRVO eyes than in contralateral eyes(all P<0.01),but there were no differences in the first-and second-order artery areas(P=0.20 and 0.25,respectively).The paCFZ areas and P/A ratios decreased significantly at 3,6,and 12 months after anti-VEGF therapy(all P<0.01).The baseline P/A ratio was significantly correlated with the baseline best-corrected visual acuity(BCVA),central retinal thickness,and their improvements at 3,6,and 12 months(all P<0.05).Baseline BCVA and P/A ratios of first-and second-order arteries were independently associated with the final BCVA in multivariate linear ***:Wide-field SS-OCTA shows that anti-VEGF therapy can lead to a significant improvement in the paCFZ parameters in *** baseline P/A ratios on SS-OCTA tend to predict better visual outcomes at 12 months after anti-VEGF therapy.

关键词： Swept-source optical coherence tomography angiography Branch retinal vein occlusion Periarterial capillary free zone Anti-VEGF treatment Prognosis

2012—2021年河北省营养改善计划地区义务教育阶段学生身高及生长迟缓率变化

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现代预防医学 2024年第2期51卷 250-253+384页

作者：苗润晓罗晓燕赵晶晶周园园田美娜乔晓芳刘长青河北省疾病预防控制中心

目的了解2012—2021年“农村义务教育学生营养改善计划”实施以来，河北省营养改善地区学生身高的变化及生长迟缓状况的变化，为更好的改善学生健康状况以及为下一步决策提供依据。方法采用分层整群的抽样方法对河北省纳入监测的学校... 详细信息

目的了解2012—2021年“农村义务教育学生营养改善计划”实施以来，河北省营养改善地区学生身高的变化及生长迟缓状况的变化，为更好的改善学生健康状况以及为下一步决策提供依据。方法采用分层整群的抽样方法对河北省纳入监测的学校的学生进行体检，测量其身高计算生长迟缓率。结果 2021年同年龄段男生、女生平均身高比2012年平均增长3.62 cm、2.65 cm(P均<0.01)。2012—2021年间男生平均身高增长的峰值在12、13岁，增加值为5.7 cm,女生平均身高增长的峰值在11、12岁，增加值为4.3 cm。男生、女生的生长迟缓率逐年下降(卡方线性趋势检验P均<0.005)。结论 2012—2021年我省农村学生营养改善计划地区6～15岁学生平均身高均增加，但身高平均增速低于全国水平，学生生长迟缓率呈逐年下降趋势，生长迟缓率低于全国平均水平。

关键词：营养改善学生身高生长迟缓