检索结果-南通市图书馆

舟形藻生物膜诱导下虾夷扇贝(Mizuhopecten yessoensis)幼虫的变态及其蛋白质组学响应

在线全文

学校读者我要写书评

暂无评论

海洋与湖沼 2024年第4期55卷 960-966页

作者：徐筱琰杜美荣蒋增杰姜娓娓夏苏东秦晓芳严瑾吕建福天津农学院天津300384 海水养殖生物育种与可持续产出全国重点实验室、中国水产科学研究院黄海水产研究所山东青岛266071 农业农村部海洋渔业与可持续发展重点实验室、中国水产科学研究院黄海水产研究所山东青岛266071 崂山实验室海洋渔业科学与食物产出过程功能实验室山东青岛266237 哈尔滨工程大学黑龙江哈尔滨150000

为深入了解舟形藻(Navicula sp.)生物膜诱导虾夷扇贝(Mizuhopecten yessoensis)幼虫附着变态的机制,选用舟形藻和虾夷扇贝幼虫作为研究对象,研究了4个浓度梯度舟形藻液(1A、10A、100A和1000A)下虾夷扇贝幼虫附着变态率以及幼虫响应舟形... 详细信息

为深入了解舟形藻(Navicula sp.)生物膜诱导虾夷扇贝(Mizuhopecten yessoensis)幼虫附着变态的机制,选用舟形藻和虾夷扇贝幼虫作为研究对象,研究了4个浓度梯度舟形藻液(1A、10A、100A和1000A)下虾夷扇贝幼虫附着变态率以及幼虫响应舟形藻生物膜诱导的蛋白质组学差异。结果表明,稀释10倍后的藻液(1366 ind./mm^(2))所形成的生物膜对幼虫诱导率最高为45%,与空白组(13%)差异极显著(P<0.01),过高或过低浓度都导致诱导率降低。采用非标记定量技术(4D label free)蛋白质组学分析比较舟形藻生物膜和对照组幼虫发现,经舟形藻生物膜诱导后共316个蛋白质表达显著上调或下调。如谷胱甘肽S转移酶、谷胱甘肽过氧化物酶、组织蛋白酶K、组织蛋白酶L、NAD(P)H氧化酶(形成H2O2)、软骨基质蛋白、胶原蛋白和铁蛋白等。以上这些差异蛋白表达的上下调均与贝类幼虫在附着变态过程中形态学变化息息相关。因此,舟形藻生物膜诱导虾夷扇贝幼虫附着变态的有效成分可能是其产生的胞外多糖,幼虫体内的凝集素检测到舟形藻生物膜表面的多糖后,特异性与多糖结合,最终诱导幼虫完成附着和变态。研究结果可为虾夷扇贝人工培育提供理论依据。

关键词：虾夷扇贝(Mizuhopecten yessoensis) 舟形藻生物膜变态蛋白质组学

在线全文

学校读者我要写书评

暂无评论

基于位置和多层编码的图像描述生成

信息技术 2024年第9期48卷 14-19,28页

作者：姜维维杨有汪兴建重庆师范大学计算机与信息科学学院重庆401331 重庆国家应用数学中心重庆401331 重庆教育管理学校重庆400066

针对图像描述中位置信息相关性和编码器各层信息利用不充分的问题,提出一种基于Transformer的位置和多层聚合编码的图像描述生成模型。该模型引入一种视觉对象的位置编码机制,通过提取独立区域位置信息中隐藏的相对空间信息,有助于模型... 详细信息

针对图像描述中位置信息相关性和编码器各层信息利用不充分的问题,提出一种基于Transformer的位置和多层聚合编码的图像描述生成模型。该模型引入一种视觉对象的位置编码机制,通过提取独立区域位置信息中隐藏的相对空间信息,有助于模型关注视觉对象之间的差异与联系。同时在该模型中,提出了一种多层聚合注意编码,通过门控循环单元与自注意力的结合,将多层图像编码信息传递到输出层,使获取的图像特征语义更加丰富。实验结果表明:所提出模型性能明显优于传统编解码器结构的图像描述模型,描述语句更加准确丰富。

关键词：图像描述生成 Transformer 多层聚合编码位置编码门控循环单元

在线全文

学校读者我要写书评

暂无评论

普洱茶多糖结构及抗氧化活性的比较研究

粮食与油脂 2024年第8期37卷 117-121页

作者：沈晓静袁彪郭毅冯宇王捷姜薇薇云南农业大学理学院云南昆明650201 云南省药用植物生物学重点实验室云南昆明650201 云南特色植物提取实验室云南昆明650106

以普洱熟茶和生茶为原料,采用超声提取熟茶粗多糖(ICP)和生茶粗多糖(ACP)并对其进行分离纯化制备熟茶精多糖(IPP)和生茶精多糖(APP)。同时,结合傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)对多糖结构特征进行表征;通过体外抗氧化... 详细信息

以普洱熟茶和生茶为原料,采用超声提取熟茶粗多糖(ICP)和生茶粗多糖(ACP)并对其进行分离纯化制备熟茶精多糖(IPP)和生茶精多糖(APP)。同时,结合傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)对多糖结构特征进行表征;通过体外抗氧化试验评估普洱茶多糖的抗氧化能力。结果表明:熟茶多糖具有紧致、密集的球状嵌合体结构,生茶多糖则呈松散的海绵状多孔结构,且APP孔状结构清晰规整。普洱茶多糖具有一定的抗氧化活性,以ICP的抗氧化活性最强。

关键词：普洱茶多糖纯化结构抗氧化活性

Evapotranspiration and Its Energy Exchange in Alpine Meadow Ecosystem on the Qinghai-Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第8期12卷 1396-1401页

作者： LI Jie jiang Sha WANG Bin jiang wei-wei TANG Yan-hong DU Ming-yuan GU Song College of Life Science Nankai University National Institute for Environmental Studies National Institute for Agro-Environmental Sciences

To understand the water and energy exchange on the Qinghai-Tibetan Plateau, we explored the characteristics of evapotranspiration （ET） and energy fluxes from 2002 to 2005 over a Kobresia meadow ecosystem using the eddy covariance method. The ratio of annual ET to precipitation （P） of meadow ecosystem was about 60%, but varied greatly with the change of season from summer to winter. The annual ET/P in meadow was lower than that in shrub, steppe and wetland ecosystems of this plateau. The incident solar radiation （Rs） received by the meadow was obviously higher than that of lowland in the same latitude; however the ratio of net radiation （Rn） to Rs with average annual value of 0.44 was significantly lower than that in the same latitude. The average annual ET was about 390 mm for 2002-2005, of which more than 80% occurred in growing season from May to September. The energy consumed on the ET was about 44% of net radiation in growing season, which was lower than that of shrub, steppe and wetland on this plateau. This study demonstrates that the Kobresia meadow may prevent the excessive water loss through evapotranspiration from the ecosystem into the atmosphere in comparison to the shrub, steppe and wetland ecosystems of the Qinghai-Tibetan Plateau.

关键词： eddy covariance evapotranspiration net radiation precipitation Qinghai-Tibetan Plateau

Expression of iNOS in early injury in a rat model of small-for-size liver transplantation

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2009年第2期8卷 146-151页

作者： jiang, wei-wei Kong, Lian-Bao Li, Guo-Qiang Wang, Xue-Hao Nanjing Med Univ Affiliated Hosp 1 Liver Transplantat Ctr Natl Inst Living Donor Liver Transplantat Nanjing 210029 Peoples R China

BACKGROUND: Living donor liver transplantation has been widely accepted as the treatment of choice for end-stage liver disease. Large amounts of nitric oxide generated by inducible nitric oxide synthase (iNOS) have been shown to play an important role in many inflammatory and immune reactions, but expression of iNOS in small-for-size liver transplantation is unknown. The aims of this study were to determine the time course of iNOS mRNA and protein as well as the redox state of liver biopsies in a rat model of small-for-size liver transplantation. METHODS: Male Sprague-Dawley rats were divided into a control group, a warm ischemia-reperfusion (IR) group, and a small-for-size liver graft group. Real-time RT-PCR and Western blotting were used to characterize the time course of the expression of iNOS mRNA and protein, respectively. Malondialdehyde (MDA) and superoxide dismutase (SOD) were used as markers to characterize the redox state of liver tissues, and the time courses of MDA and SOD levels were also measured. RESULTS: The expression of iNOS mRNA and protein levels in the warm IR and small-for-size graft groups both significantly increased after reperfusion, and peaked at 3 hours. Moreover, the increase in MDA was accompanied by increased iNOS in the period of 1-24 hours after reperfusion. The MDA levels in the warm IR and small-for-size graft groups significantly increased after reperfusion, peaked at 3 hours, and decreased thereafter. The direction of change in SOD was opposite that of the change in MDA. CONCLUSIONS: The expression of iNOS mRNA and protein is activated after reperfusion both in hepatic warm IR injury and small-for-size liver graft. Furthermore, the results of this study suggest that iNOS contributes to the damage in warm IR injury and small-for-size grafts via free oxygen radicals.

关键词： inducible nitric oxide synthase small-for-size graft ischemia-reperfusion injury liver transplantation

Highly homogeneous zero-index metamaterials make devices more compact and perform better

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第5期13卷 806-807页

作者： wei-Xiang jiang State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University210096 NanjingChina

A highly homogeneous microwave zero-index metamaterial based on high-permittivity SrTiO3 ceramics is demonstrated to realize the small-aperture high-directivity *** a novel technique is a remarkable step forward to de... 详细信息

关键词： ceramics SrTiO3 Highly

An extended numerical model of the first exothermic peak for three dimensional printed cement-based materials

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

Frontiers of Structural and Civil Engineering 2024年第1期18卷 80-88页

作者： wei jiang Wenqian LI Xi CHEN School of Materials Science and Engineering Tongji UniversityShanghai 200092China School of Civil Engineering Tongji UniversityShanghai 200092China

The first exothermic peak of cement-based material occurs a few minutes after mixing,and the properties of three dimensional(3D)printed concrete,such as setting time,are very sensitive to *** this background,based on the classical Park cement exothermic model of hydration,we propose and construct a numerical model of the first exothermic peak,taking into account the proportions of C_(3)S,C_(3)A and quicklime in *** calculated parameters are calibrated by means of relevant published exothermic test *** is found that this developed model offers a good simulation of the first exothermic peak of hydration for C_(3)S and C_(3)A proportions from 0 to 100% of cement clinker and reflects the effect of quicklime content at 8%-10%.The unique value of this research is provision of an important computational tool for applications that are sensitive to the first exothermic peak of hydration,such as 3D printing.

关键词： 3D printed cement-based materials cement hydration the first exothermic peak liquid quick-setting agent numerical model

A Quantitative Seismic Topographic Effect Prediction Method Based upon BP Neural Network Algorithm and FEM Simulation

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 Earth Science 2024年第4期35卷 1355-1366页

作者： Qifeng jiang Mianshui Rong wei wei Tingting Chen Shandong Seismic Hazard Prevention Center Shandong Earthquake AgencyJinan250014China Shandong Institute of Earthquake Engineering Jinan250021China Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education Beijing University of TechnologyBeijing100124China Publicity and Education Center Shandong Earthquake AgencyJinan250014China Shandong Earthquake Station Shandong Earthquake AgencyJinan250014China

Topography can strongly affect ground motion,and studies of the quantification of hill surfaces’topographic effect are relatively *** this paper,a new quantitative seismic topographic effect prediction method based upon the BP neural network algorithm and three-dimensional finite element method(FEM)was *** FEM simulation results were compared with seismic records and the results show that the PGA and response spectra have a tendency to increase with increasing elevation,but the correlation between PGA amplification factors and slope is not obvious for low *** BP neural network models were established for the prediction of amplification factors of PGA and response *** kinds of input variables’combinations which are convenient to achieve are proposed in this paper for the prediction of amplification factors of PGA and response spectra,*** absolute values of prediction errors can be mostly within 0.1 for PGA amplification factors,and they can be mostly within 0.2 for response spectra’s amplification *** input variables’combination can achieve better prediction performance while the other one has better expandability of the predictive ***,the BP models only employ one hidden layer with about a hundred nodes,which makes it efficient for training.

关键词： seismic topographic effect finite element method BP neural network algorithm earthquake disaster prevention

Multi-Beam Interference Transmission Spectrum Observed from an Eccentric Core Single-Mode Fiber

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第2期28卷 122-125页

作者： FAN Lin-Yong jiang wei-wei ZHAO Rui-Feng PEI Li JIAN Shui-Sheng Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong UniversityBeijing 100044

An eccentric core single-mode fiber,whose core is away from the axis of the fiber,is fabricated by using the fiber preform goniometric-groove method and the stack-and-draw *** eccentric core single-mode fiber without coating is spliced between two single-mode *** mode and cladding modes are excited at one splicing point between the eccentric core single-mode fiber and the single-mode fiber,and propagate in the eccentric core single-mode fiber,then interfere with each other at the other splicing ***-beam interference transmission spectrum is *** in-line fiber interferometric strain sensor based on the eccentric core single-mode fiber is realized.

关键词： fiber mode cladding