检索结果-南通市图书馆

Wood anatomy chronologies of Scots pine in the foothills of the Western Sayan(Siberia)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第3期35卷 13-27页

作者： Elena A.Babushkina Dmitry R.Dergunov Mikhail S.Zharkov Liliana V.Belokopytova Dina F.Zhirnova bao Yang jingjing Liu Xiaomei Peng ·Eugene A.Vaganoy Khakass Technical Institute Siberian Federal UniversityAbakan 655017Russia Institute of Ecology and Geography Siberian Federal UniversityKrasnoyarsk 660036Russia Mathematical Methods and IT Department Siberian Federal UniversityKrasnoyarsk 660036Russia Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000People's Republic of China School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093People's Republic of China Department of Dendroecology V.N.Sukachev Institute of ForestSiberian Branch of the Russian Academy of ScienceKrasnoyarsk 660036Russia

Recent methodological advances in quantitative wood anatomy have provided new insights into the climatic responses of radial growth at the scale of cell structure of tree rings.This study considered long-term chronologies of tracheid measurements,indexed by a novel approach to separate their specific climatic responses from signal recorded in cell production(closely reflected in tree-ring width).To fll gaps in understanding the impact of climate on conifer xylem structure,Scots pine(Pinus sylvestris L.)trees>200 years old were selected within the forest-steppe zone in southern Siberia.Such habitats undergo mild moisture deficits and the resulting climatic regulation of growth processes.Mean and maximum values of cell radial diameter and cell wall thickness were recorded for each tree ring.Despite a low level of climatogenic stress,components of cell chronologies independent of cambial activity were separated to obtain significant climatic signals revealing the timing of the specific stages of tracheid differentiation.Cell expansion lasted from mid-April to July and was impacted similarly to tree-ring width(stimulated by precipitation and stressed by heat),maximum cell size formed late June.A switch in the climatic responses of mean anatomical traits indicated transition to latewood in mid-July.Secondary wall deposition lasted until mid-September,suppressed by end of season temperatures.Generally,anatomical climatic responses were modulated by a less dry May and September compared with summer months.

关键词： Quantitative wood anatomy Cell radial size Cell wall thickness Pinus sylvestris Climatic response

Three-dimensional S-wave velocity structure of the crust and upper mantle for the normal fault system beneath the Yinchuan Basin from joint inversion of receiver function and surface wave

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2023年第5期66卷 997-1014页

作者： Weilai WANG Guangyao CAI Guijuan LAI Xianwei ZENG jingjing bao Long ZHANG Jun SU Mingfei CHEN Institute of Geophysics China Earthquake AdministrationBeijing100081China Earthquake Agency of Ningxia Hui Autonomous Region Yinchuan750001China Sichuan Earthquake Agency Chengdu610041China

A series of parallel normal faults are distributed in the Helan Mountain-Yinchuan Basin tectonic belt,where a historical M8.0 earthquake occurred.It is rare that such a great earthquake occurs in a normal fault system within the continent.To deeply understand the fine structure of the normal fault system,we deployed 104 broadband temporary stations near the system,collected data from permanent stations and other temporary stations nearby,and obtained the high-precision threedimensional S-wave velocity structure beneath 206 stations via joint inversion of receiver function and surface wave.A typical graben-in-graben feature bounded by four major faults was identified in the Yinchuan Basin.We analyzed the seismicity in the normal fault system and found a seismic strip in the southern part of the basin,where there are significant changes in the sedimentary thickness,which is speculated to be the southern boundary of the normal fault system.There are significant differences in the crustal thickness and velocity structure in the crust on both sides of the boundary between the Helan Mountain and the Yinchuan Basin,and a low-velocity zone was identified in the upper mantle beneath this boundary,which could be related to the fact that the Helan Mountain-Yinchuan Basin tectonic belt is located between the Alxa Block and the Ordos Block.The M8.0 Yinchuan-Pingluo earthquake occurred at the junction of four major faults in the Yinchuan Basin,which was located in the high-velocity zone near the velocity transition zone at the basin-mountain boundary.The low-velocity zone in the upper mantle beneath this boundary may have promoted the nucleation of this earthquake.Based on evidence from geological drilling,micro seismicity,the regional stress field,and the velocity models obtained in this study,it is inferred that the eastern piedmont fault zone of the Helan Mountain was the seismogenic fault of the 1739 M8.0 Yinchuan-Pingluo earthquake.

关键词： Yinchuan Basin Helan Mountain Receiver function Surface wave tomography Normal fault system

Differences of polygonal faults related to upper Miocene channels:a case study from the Beijiao sag of Qiongdongnan basin,South China Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 84-99页

作者： Yufeng LI Renhai PU Xueqin ZHAO Gongcheng ZHANG Xiaowei FAN jingjing bao Jiong WANG School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China Key Laboratory of Marine Mineral Resources Ministry of Natural ResourcesGuangzhou 510075China CNOOC Research Institute Beijing 100028China Research Institute of Yangchang Petroleum(Group)Co.Ltd. Xi’an 710075China Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Central Sichuan Oil-Gas District Petro-China Southwest Oil and Gas Field CompanySuining 629000China

Deep-water coarse-grained channels are embedded within a polygonal fault tier,and the polygonal faults(PFs)present non-polygonal geometries rather than classic polygonal geometry in plan view.However,PFs present differences when they encounter deep-water(coarse-grained vs.fine-grained)channels with different lithology,which has not been further studied to date.Three-dimensional(3D)seismic data and a drilling well from Beijiao sag of Qiongdongnanbasin,South China Sea were utilized to document the plan view and cross-sectional properties of the PFs and their differences and genetic mechanism were investigated.Results show that,first,PFs can be divided morphologically into channel-segmenting PFs and channel-bounding PFs in plan view.The former virtually cuts or segments the axes of channels in highand low-amplitudes,and the latter nearly parallels the boundaries of the channels.Both are approximately perpendicular to each other.Secondly,channel-bounding PFs that related to low-amplitude channels are much longer than those of high-amplitude ones;channel-segmenting PFs related to low-amplitude channels are slightly longer than the counterparts related to high-amplitude channels.Lastly,the magnitudes(e.g.,heights)of the PFs are proportional to the scales(e.g.,widths and heights)of low-amplitude channels,whereas the magnitudes of the PFs are inversely proportional to the scales of high amplitude channels.Coarse-grained(high amplitude)channels act as a mechanical barrier to the propagation of PFs,whereas fine-grained(low-amplitude)channels are beneficial to the propagation and nucleation of PFs.Additionally,the genetic mechanism of PFs is discussed and reckoned as combined geneses of gravitational spreading and overpressure hydrofracture.The differences of the PFs can be used to reasonably differentiate coarse-grained channels from fine-grained channels.This study provides new insights into understanding the different geometries of the PFs related to coarse-grained and fine-grained channels and their genetic mechanism.

关键词： polygonal faults coarse-grained channels fine-grained channels gravitational spreading overpressure hydrofracture

Licorice-saponin A3 is a broad-spectrum inhibitor for COVID-19 by targeting viral spike and anti-inflammation

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2024年第1期14卷 115-127页

作者： Yang Yi Wenzhe Li Kefang Liu Heng Xue Rong Yu Meng Zhang Yang-Oujie bao Xinyuan Lai jingjing Fan Yuxi Huang Jing Wang Xiaomeng Shi Junhua Li Hongping Wei Kuanhui Xiang Linjie Li Rong Zhang Xin Zhao Xue Qiao Hang Yang Min Ye State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing100191China Yunnan Baiyao International Medical Research Center Peking UniversityBeijing100191China CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing100101China CAS Key Laboratory of Special Pathogens and Biosafety Center for Biosafety Mega-ScienceWuhan Institute of VirologyChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Department of Microbiology and Infectious Disease Center School of Basic Medical SciencesPeking University Health Science CenterPeking UniversityBeijing100191China Hubei Jiangxia Laboratory Wuhan430000China Shenzhen Children's Hospital ShenzhenGuangdong518036China

Currently,human health due to corona virus disease 2019(COVID-19)pandemic has been seriously threatened.The coronavirus severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)spike(S)protein plays a crucial role in virus transmission and several S-based therapeutic approaches have been approved for the treatment of COVID-19.However,the efficacy is compromised by the SARS-CoV-2 evolvement and mutation.Here we report the SARS-CoV-2 S protein receptor-binding domain(RBD)inhibitor licorice-saponin A3(A3)could widely inhibit RBD of SARS-CoV-2 variants,including Beta,Delta,and Omicron BA.1,XBB and BQ1.1.Furthermore,A3 could potently inhibit SARS-CoV-2 Omicron virus in Vero E6 cells,with EC50 of 1.016μM.The mechanism was related to binding with Y453 of RBD determined by hydrogen-deuterium exchange mass spectrometry(HDX-MS)analysis combined with quantum mechanics/molecular mechanics(QM/MM)simulations.Interestingly,phosphoproteomics analysis and multi fluorescent immunohistochemistry(mIHC)respectively indicated that A3 also inhibits host inflammation by directly modulating the JNK and p38 mitogen-activated protein kinase(MAPK)pathways and rebalancing the corresponding immune dysregulation.This work supports A3 as a promising broad-spectrum small molecule drug candidate for COVID-19.

关键词： COVID-19 Inflammation Licorice-saponin A3 Receptor-binding domain(RBD) SARS-CoV-2

Regeneration and anti-migration of sand waves associated with sand mining in the Taiwan Shoal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第9期42卷 71-78页

作者： jingjing bao Feng Cai Chengqiang Wu Huiquan Lu Yongling Zheng Yufeng Li Li Sun Chungeng Liu Yongbao Li Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Physical and Geological Processes Xiamen 361005China Fujian Provincial Key Laboratory of Marine Ecological Protection and Restoration Xiamen 361005China Xiamen Ocean Engineering Exploration and Design Institute Co.Ltd. Xiamen 361005China School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China

Sand waves in the Taiwan Shoal are characterized by two distinct spatial scales. Giant sand waves have a length of2 kilometers with height between 5 m and 25 m, whilst small sand waves is less than 100-m long with height less than 5 m between giant sand wave peaks(crests). A series of five high-resolution multi-beam echo-sounding surveys between 2012 and 2020 in the middle of Taiwan Shoal indicated that artificial dredging on the giant sand waves had caused sand wave reform and evolution. Overall, the removal of giant sand waves significantly affected the migration of small sand waves adjacent to the dredging site, with the latter on both sides of the former appear to migrate towards the dredging pit. Moreover, in the dredging area, new sand waves emerged with wavelength much smaller than the original giant sand waves, while the convergent pattern of the small sand waves tends to store and form the giant sand waves, which might spread far beyond the survey period.

关键词： small sand wave giant sand wave anti-migration regrowing sand mining Taiwan Shoal

在线全文

学校读者我要写书评

暂无评论

华北克拉通地区基于程函方程的面波层析成像

地球物理学报 2024年第2期67卷 503-519页

作者：包晶晶王未来蔡光耀刘慧杰中国地震局地球物理研究所北京100081

利用布设在华北克拉通地区的流动和固定地震台站记录到的地震波数据,使用基于程函方程的面波成像方法获得了整个华北克拉通地区瑞利波15~150 s周期的相速度,并反演了研究区S波速度结构.中长周期相速度结果显示,在上地幔及岩石圈深度范围... 详细信息

利用布设在华北克拉通地区的流动和固定地震台站记录到的地震波数据,使用基于程函方程的面波成像方法获得了整个华北克拉通地区瑞利波15~150 s周期的相速度,并反演了研究区S波速度结构.中长周期相速度结果显示,在上地幔及岩石圈深度范围内,燕山地区表现为高速特征,华北克拉通中部大同盆地及其以南地区、太行山等区域的低速体与华北盆地的低速体相连,呈现大面积的低速异常,低速体的速度值比青藏高原东北缘的速度值更低;S波速度显示鄂尔多斯岩石圈厚度较厚,克拉通中部和华北盆地岩石圈厚度相差不大,燕山地区岩石圈厚度要厚于华北盆地.本文认为华北克拉通岩石圈破坏存在分区性,克拉通中部和燕山地区均存在一定的克拉通破坏,但破坏程度不同,鄂尔多斯地块北部存在局部克拉通改造,但克拉通稳定性特征依然存在;破坏的主要动力学来源更可能是太平洋板块的西向俯冲.研究发现克拉通中部和东部的强震分布区与克拉通破坏区域重合,大部分强震发生在岩石圈强度边界上,分析认为岩石圈强度的差异是岩石圈强度边界上显示出较高的强震活动性的原因.

关键词：华北克拉通程函方程面波成像瑞利波相速度强震活动性

羟丙基-β-环糊精-姜黄素包合物的制备及其光动力杀灭沙门氏菌的机制

在线全文

学校读者我要写书评

暂无评论

食品工业科技 2024年第12期45卷 75-84页

作者：鲍悦忻陈艳红马钰黄晶晶王佳华中农业大学食品科学技术学院湖北武汉430070

沙门氏菌是国内外引起人类食源性疾病最主要的食源性致病菌之一,开发新型有效的抗菌技术对保障食品安全至关重要。本研究利用羟丙基-β-环糊精(HP-β-CD)的包合作用,包合姜黄素(Curcumin,CUR)作为光敏剂,研究其介导光动力技术(Photodyna... 详细信息

沙门氏菌是国内外引起人类食源性疾病最主要的食源性致病菌之一,开发新型有效的抗菌技术对保障食品安全至关重要。本研究利用羟丙基-β-环糊精(HP-β-CD)的包合作用,包合姜黄素(Curcumin,CUR)作为光敏剂,研究其介导光动力技术(Photodynamic Inactivation Technology,PDI)对食品样品中鼠伤寒沙门氏菌ATCC14028的杀菌效果及作用机制。设置乙醇浓度为40%、HP-β-CD与CUR摩尔比为2:1,在45℃条件下包合4 h时,所形成的CUR包合率最大,为60.08%,该包合物经结构表征后测定其水溶性显著(P<0.05)提高,达到3.98×10^(3)μg/mL。结果表明,当包合物质量浓度(以CUR浓度计)为20µg/mL,初始鼠伤寒沙门氏菌菌落数量级为106 CFU/mL时,LED蓝光(450 nm)照射40 min可使菌落数减少3.73 lg(CFU/mL),可杀灭47.92%~64.40%的耐药沙门氏菌,并且对即食生菜中的沙门氏菌也有一定的控制作用。在光动力技术处理后,沙门氏菌胞内产生了较高水平的活性氧,胞内容物明显减少,推测CUR-HP-β-CD介导的PDI可能通过破坏细胞膜结构达到杀菌抑菌的目的。本研究将光动力杀菌技术应用于食品安全领域,这为食品工业中防治沙门氏菌等食源性致病菌的污染提供了重要的理论基础和技术支撑。

关键词：姜黄素羟丙基-β-环糊精光动力技术沙门氏菌杀菌机理

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

肉羊种业科技创新发展现状与趋势

中国畜禽种业 2024年第4期20卷 117-132页

作者：鲍晶晶张莉中国农业科学院北京畜牧兽医研究所北京100193

肉羊种业是肉羊产业的“芯片”,其科技创新在保障肉羊种源安全、提升群体性能以及促进肉羊产业高质量发展等方面发挥着关键作用。该文介绍了国内外肉羊种业概况,从基础研究和育种核心技术等方面总结了肉羊种业科技创新的发展现状,分析... 详细信息

肉羊种业是肉羊产业的“芯片”,其科技创新在保障肉羊种源安全、提升群体性能以及促进肉羊产业高质量发展等方面发挥着关键作用。该文介绍了国内外肉羊种业概况,从基础研究和育种核心技术等方面总结了肉羊种业科技创新的发展现状,分析了未来肉羊种业科技创新的发展趋势。并针对我国肉羊种业科技创新发展中存在的突出问题,提出了相应的对策与建议,以期为提高我国肉羊种业科技创新能力、实现科技自立自强、增强肉羊种业核心竞争力和推动肉羊产业高质量发展奠定理论基础。

关键词：肉羊种业科技创新研究现状发展趋势

猫疱疹病毒Ⅰ型gIgE基因缺失毒株的构建及生物学特性分析

在线全文

学校读者我要写书评

暂无评论

南京农业大学学报 2024年第3期47卷 515-521页

作者：张晶晶孙慧敏宋家升鲍恩东南京农业大学动物医学院江苏南京210095 浙江迪福润丝生物科技有限公司浙江杭州310051

[目的]为了开发一种能够预防感染、阻止潜伏期建立的猫疱疹病毒Ⅰ型(FHV-1)弱毒疫苗,利用同源重组以及CRISPR/Cas9技术将FHV-1的gIgE基因替换为红色荧光蛋白基因(RFP)。[方法]构建针对gIgE基因的3条sgRNA及表达Cas9蛋白的质粒,将含有sg... 详细信息

[目的]为了开发一种能够预防感染、阻止潜伏期建立的猫疱疹病毒Ⅰ型(FHV-1)弱毒疫苗,利用同源重组以及CRISPR/Cas9技术将FHV-1的gIgE基因替换为红色荧光蛋白基因(RFP)。[方法]构建针对gIgE基因的3条sgRNA及表达Cas9蛋白的质粒,将含有sgRNA及Cas9蛋白的质粒与含有RFP的转移载体共转染到猫肾细胞(F81),通过噬斑纯化以及有限稀释方法进行病毒纯化,以重组病毒感染F81细胞连续10代验证其遗传稳定性,通过测定重组病毒以及亲本病毒H07的病毒滴度、一步生长曲线以及判断噬斑大小评价其生物学特性。[结果]成功构建了FHV-1 gIgE基因缺失毒株并将其命名为FHV-ΔgIgE-RFP;提取重组病毒DNA,通过PCR验证gIgE基因无目的条带,表明重组病毒纯化成功,再通过PCR验证RFP基因有目的条带,表明重组病毒成功插入外源基因。病毒滴度测定结果显示,与亲本病毒相比重组病毒的病毒滴度下降了90%;在F 1—F 10连续传代过程中RFP荧光表达且无减弱现象,表明重组病毒可稳定表达外源基因;测定FHV-ΔgIgE-RFP以及H07的生长曲线,重组病毒的生长趋势与亲本病毒大致相同,表明插入外源基因并不会改变病毒本身的生长特性;噬斑观察及染色结果显示,在病毒感染细胞前、后期,重组病毒的噬斑都小于亲本病毒,表明缺失gIgE基因后病毒毒力下降。[结论]成功构建并筛选出FHV-1 gIgE基因缺失致弱毒株,为开发疱疹病毒弱毒活载体疫苗奠定了基础。

关键词：猫疱疹病毒Ⅰ型(FHV-1) 致弱毒株重组病毒病毒筛选

维普期刊数据库博看期刊