检索结果-南通市图书馆

Three novel umami peptides derived from the alcohol extract of the Pacific oyster(Crassostrea gigas):identification,characterizations and interactions with T1R1/T1R3 taste receptors

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第1期13卷 146-153页

作者： Baifeng Fu Di Wu Shuzhen Cheng Xianbing Xu Ling zhang lishu Wang Heshanm REl-Seedi Hanxiong Liu Ming Du School of Food Science and Technology Dalian Polytechnic UniversityDalian 116034China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China National Engineering Research Center of Seafood Dalian Polytechnic UniversityDalian 116034China Division of Hematology and Oncology Department of MedicineMedical College of WisconsinMilwaukee 53226USA Division of Pharmacognosy Department of Medicinal ChemistryBiomedical CentreUppsala UniversityUppsala SE-75123Sweden

Oyster(Crassostrea gigas),the main ingredient of oyster sauce,has a strong umami *** this study,three potential umami peptides,FLNQDEEAR(FR-9),FNKEE(FE-5),and EEFLK(EK-5),were identified and screened from the alcoholic extracts of the oyster using nano-HPLC-MS/MS analysis,i Umami-Scoring Card Method(i Umami-SCM)database and molecular docking(MD).Sensory evaluation and electronic tongue analysis were further used to confirm their *** threshold of the three peptides ranged from 0.38 to 0.55 mg/m *** with umami receptors T1R1/T1R3 indicated that the electrostatic interaction and hydrogen bond interaction were the main forces ***,the Phe592 and Gln853 of T1R3 were the primary docking site for MD and played an important role in umami *** with two Glu residues at the terminus had stronger umami,especially at the *** results contribute to the understanding of umami peptides in oysters and the interaction mechanism between umami peptides and umami receptors.

关键词： Oyster umami peptides iUmami-SCM Taste characterization Molecular docking

Probing magnetic-proximity-effect enlarged valley splitting in monolayer WSe2 by photoluminescence

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第12期11卷 6252-6259页

作者： Chenji Zou Chunxiao Cong Jingzhi Shang Chuan Zhao Mustafa Eginligil lishu Wu Yu Chen Hongbo zhang Shun Feng Jing zhang Hao Zeng Wei Huang Ting Yu Address correspondence to Ting Yu yuting@ntu.edu.sg Chunxiao Cong cxcong@*** Hao Zeng haozeng@bufalo.edu Wei Huang lamwhuang( ***

Possessing a valley degree of freedom and potential in information processing by manipulating valley features (such as valley splitting), group-VI monolayer transition metal dichalcogenides have attracted enormous interest. This valley splitting can be measured based on the difference between the peak energies of σ+ and σ− polarized emissions for excitons or trions in direct band gap monolayer transition metal dichalcogenides under perpendicular magnetic fields. In this work, a well-prepared heterostructure is formed by transferring exfoliated WSe2 onto a EuS substrate. Circular-polarization-resolved photoluminescence spectroscopy, one of the most facile and intuitive methods, is used to probe the difference of the gap energy in two valleys under an applied out-of-plane external magnetic field. Our results indicate that valley splitting can be enhanced when using a EuS substrate, as compared to a SiO2/Si substrate. The enhanced valley splitting of the WSe2/EuS heterostructure can be understood as a result of an interfacial magnetic exchange field originating from the magnetic proximity effect. The value of this magnetic exchange field, based on our estimation, is approximately 9 T. Our findings will stimulate further studies on the magnetic exchange field at the interface of similar heterostructures.

关键词： valley splitting transition metal dichalcogenides magnetic proximity effect heterostructure magnetic exchange field

背景噪声和密集台阵成像技术在哈尔乌素露天煤矿采空区的应用

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

CT理论与应用研究（中英文） 2023年第4期32卷 461-470页

作者：颜杰张立树洪鹤庭黄泉城雷宇航廖小龙桂来保杨旋中国神华能源股份有限公司哈尔乌素露天煤矿内蒙古鄂尔多斯017000 智地感知(合肥)科技有限公司合肥230000 中国科学技术大学地球和空间科学学院合肥230000

未知煤矿采空区是煤矿安全生产的巨大隐患,探测煤矿采空区的位置和形态对于保障煤矿安全生产具有重要意义,因此煤矿采空区探测是煤矿安全生产的关键内容之一。目前采空区探测方法较多,但存在成本高、周期长、效率低等问题。近些年来随... 详细信息

未知煤矿采空区是煤矿安全生产的巨大隐患,探测煤矿采空区的位置和形态对于保障煤矿安全生产具有重要意义,因此煤矿采空区探测是煤矿安全生产的关键内容之一。目前采空区探测方法较多,但存在成本高、周期长、效率低等问题。近些年来随着密集台阵观测技术的快速发展,背景噪声成像分析在浅层结构探测方面也得到了广泛应用。本文采用基于节点地震仪密集台阵观测和背景噪声成像技术,在内蒙古哈尔乌素露天煤矿区附近布设的145个台站,台间距为16 m,开展为期10 d的连续观测,利用背景噪声成像技术对煤矿采空区进行成像分析。结果表明:(1)通过背景噪声、ESPAC等方法获得探测区的橫波速度结构,背景噪声探测方法可以较好地圈划出测区内的横波低速异常体;(2)根据横波低速区域分布特征获得采空区潜在位置,与钻孔验证揭示的采空区位置吻合较好,验证该方法勾画采空区的良好效果。相关成果显示,利用地表密集地震台阵观测开展背景噪声成像并结合ESPAC方法进行数据处理是进行露天矿采空区探测的一种经济、有效的手段,具有广泛的应用前景。

关键词：背景噪声密集台阵被动源地震 ESPAC 采空区探测

Raman scattering investigation of twisted WS_(2)/MoS_(2) heterostructures: interlayer mechanical coupling versus charge transfer

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第7期14卷 2215-2223页

作者： lishu Wu Chunxiao Cong Jingzhi Shang Weihuang Yang Yu Chen Jiadong Zhou Wei Ai Yanlong Wang Shun Feng Hongbo zhang Zheng Liu Ting Yu Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore School of Information Science and Technology Fudan UniversityShanghai 200433China Shaanxi Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710129China Engineering Research Center of Smart Microsensors and Microsystems Ministry of EducationCollege of Electronics and InformationHangzhou Dianzi UniversityHangzhou 310018China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Twisted van der Waals homo-and hetero-structures have aroused great attentions due to their unique physical properties,providing a new platform to explore the novel two-dimensional(2D)condensed matter *** robust dependence of phonon vibrations and electronic band structures on the twist angle has been intensively observed in transition metal dichalcogenide(TMD)***,the effects of twist angle on the lattice vibrational properties in the TMD heterostructures have not caused enough ***,we report the distinct evolutions of Raman scattering and the underlying interlayer interactions in the twisted WS_(2)/MoS_(2) *** shifts and linewidths of E_(2g)(Γ)and A_(1g)(Γ)phonon modes are found to be twist angle *** particular,analogous to that of the twisted TMD homostructures,the frequency separations between E_(2g)(Γ)and A_(1g)(Γ)modes of MoS_(2) and WS_(2) in the twisted heterostructures varying with twist angle correlate with the interlayer mechanical coupling,essentially originating from the spacing-related repulsion between sulfur ***,the opposite shift behaviors and broadening of A_(1g)(Γ)modes caused by charge transfer are also observed in the twisted *** calculated interlayer distances and band alignment of twisted WS_(2)/MoS_(2) through density functional theory further evidence our interpretations on the roles of the interlayer mechanical coupling and charge transfer in variations of Raman *** understanding and controlling of interlayer interaction through the stacking orientation are significant for future optoelectronic device design based on the newly emerged 2D heterostructures.

关键词： van der Waals heterostructures interlayer coupling Raman scattering twist angle charge transfer

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

提升枣产品高附加值关键问题研究

农业科技管理 2013年第4期32卷 90-93页

作者：张立树刘进余肖家良刘明霞李志欣孙秀坤岳雷河北省沧州市农林科学院沧州061001 沧州市林业局沧州061001 沧州职业技术学院沧州061001

文章阐述了沧州枣产业发展的现状,分析了沧州枣产业存在的主要问题和限制枣产品高附加值提升的关键问题,并针对问题提出了调整品种结构,优化发展布局,大力推广和应用优良新品种;强化标准技术,使枣果提质增效;做大做强枣加工企业,搞好枣... 详细信息

文章阐述了沧州枣产业发展的现状,分析了沧州枣产业存在的主要问题和限制枣产品高附加值提升的关键问题,并针对问题提出了调整品种结构,优化发展布局,大力推广和应用优良新品种;强化标准技术,使枣果提质增效;做大做强枣加工企业,搞好枣产品深加工;加强对枣高附加值产品关键技术研究等多项有效措施,以期进一步提升枣产品的附加值,促进枣产业持续健康发展。

关键词：枣产品高附加值关键问题研究发展对策

在线全文

学校读者我要写书评

暂无评论

沧州枣产业发展的SWOT分析研究

河北林果研究 2016年第3期31卷 257-261页

作者：张立树刘明霞岳雷肖家良李志欣孙秀坤刘进余沧州市农林科学院河北沧州061001 沧州职业技术学院河北沧州061001 沧州市林业局河北沧州061001

在调研的基础上,对沧州枣产业发展进行SWOT分析,提出了调整结构,优化布局,应用新品种,提倡枣粮间作;扶持壮大枣加工企业,搞好深加工,提升附加值;强化标准技术,促枣果提质增效;加强红枣深加工技术的研究开发利用;加强监管力度;加强科研... 详细信息

在调研的基础上,对沧州枣产业发展进行SWOT分析,提出了调整结构,优化布局,应用新品种,提倡枣粮间作;扶持壮大枣加工企业,搞好深加工,提升附加值;强化标准技术,促枣果提质增效;加强红枣深加工技术的研究开发利用;加强监管力度;加强科研联合攻关,提供科技支撑;增强防灾减灾抗灾能力等对策,以促进沧州枣产业的持续健康发展。

关键词：沧州红枣产业 SWOT分析对策

在线全文

学校读者我要写书评

暂无评论

早熟优质杏新品种——沧早甜杏2号

园艺学报 2005年第1期32卷 175-175页

作者：刘进余李志欣张立树范文良苗锋孙秀坤河北省沧州市农林科学院沧州061001

‘沧早甜杏2号’是利用具有优良特性的杏树资源,采取自然杂交实生选育法培育出的极早熟杏新品种。单果平均55g,果实卵圆形,色泽艳丽,香气浓,汁液多,酸甜可口,离核,可溶性固形物含量15.5%,5月下旬成熟,适宜在杏适栽区内发展。

关键词：杏品种

Tunable excitonic emission of monolayer WS2 for the optical detection of DNA nucleobases

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第3期11卷 1744-1754页

作者： Shun Feng Chunxiao Cong Namphung Peimyoo Yu Chen Jingzhi Shang Chenji Zou Bingchen Cao lishu Wu Jing zhang Mustafa Eginligil Xingzhi Wang Qihua Xiong Arundithi Ananthanarayanan Peng Chen Baile zhang Ting Yu Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore School of Information Science and Technology Fudan University Shanghai 200433 China Key Laboratory of Flexible Uectronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China Division of Bioengineering School of Chemical and Biomedical Engineering Nanyang Technological University Singapore 637457Singapore

Two-dimensional transition metal dichalcogenides （2D TMDs） possess a tunable excitonic light emission that is sensitive to external conditions such as electric field, strain, and chemical doping. In this work, we reveal the interactions between DNA nucleobases, i.e., adenine （A）, guanine （G）, cytosine （C）, and thymine （T） and monolayer WS2 by investigating the changes in the photoluminescence （PL） emissions of the monolayer WS2 after coating with nucleobase solutions. We found that adenine and guanine exert a clear effect on the PL profile of the monolayer WS2 and cause different PL evolution trends. In contrast, cytosine and thymine have little effect on the PL behavior. To obtain information on the interactions between the DNA bases and WS2, a series of measurements were conducted on adenine-coated WS2 monolayers, as a demonstration. The p-type doping of the WS2 monolayers on the introduction of adenine is clearly shown by both the evolution of the PL spectra and the electrical transport response. Our findings open the door for the development of label-free optical sensing approaches in which the detection signals arise from the tunable excitonic emission of the TMD itself rather than the fluorescence signals of label molecules. This dopant-selective optical response to the DNA nucleobases fills the gaps in previously reported optical biosensing methods and indicates a potential new strategy for DNA sequencing.

关键词： tungsten disulfide photoluminescence optical biosensing chemical doping

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

网络游记文本中旅游行程链提取方法

地球信息科学学报 2024年第2期26卷 477-487页

作者：阮陵葛军莲张翎王黎淑王晓宣安徽师范大学地理与旅游学院芜湖340200 南京师范大学地理科学学院南京210023 滁州学院实景地理环境安徽省重点实验室滁州239000

网络游记是旅游者在互联网上发布的自述性旅游过程记录,描述了旅游的前后过程和感受体验。从网络游记文本中提取旅游行程链,分析行程结构,能给游客的行程制定、线路设计提供重要的参考。传统的游记文本行程提取大多依赖于人工识别文本... 详细信息

网络游记是旅游者在互联网上发布的自述性旅游过程记录,描述了旅游的前后过程和感受体验。从网络游记文本中提取旅游行程链,分析行程结构,能给游客的行程制定、线路设计提供重要的参考。传统的游记文本行程提取大多依赖于人工识别文本中的行程节点,再进行串联、合并处理,工作量较大。自动提取游记文本中的旅游行程链,能够提高数据处理和分析效率。本文基于自然语言处理技术,在深入分析游记网络文本的段落结构和表达特点的基础上,归纳了行程节点和节点次序关系的句法表达规则,构建了行程节点触发词表,进而提出了基于句法规则的旅游行程链提取方法,主要包含行程节点的识别、节点次序关系的识别和旅游行程链的生成,能实现网络游记文本的旅游行程重构。本文采集了蚂蜂窝平台17 226篇南京市网络游记文本数据,采用最长公共子序列算法,开展了本文方法的试验验证。通过对比分析,本文方法提取的旅游行程链和人工识别的真实行程链相似度达到86.14%,高于实体关系抽取领域的BERT-BiLSTM-CasRel深度学习模型的83.1%。相比现有关系提取类深度学习方法需要开展大量的数据标注,本文方法计算更加便捷,准确率相对较高,仅需构建区域旅游点名录,即可实现网络游记文本中行程信息的自动提取。

关键词：网络游记网络文本旅游行程链行程重构行程提取节点识别规则匹配