检索结果-南通市图书馆

Towards accurate mapping of loess waterworn gully by integrating google earth imagery and DEM using deep learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2024年第1期12卷 13-28页

作者： Rong Chen Yi Zhou Zetao Wang Ying li fan li f.ng Yang School of Geography and Tourism Shaanxi Normal UniversityXi'an710119China National Experiment and Teaching Demonstration Center for Geography Xi'an710119China SuperMap Software Co. Ltd.Beijing100015China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen518055China

Accurate mapping of loess waterworn gully(LWG)is essential to further study gully erosion and geomorphological evolution for the Chinese Loess Plateau(CLP).Due to the vertical joint and collapsibility of loess,LWGs have the characteristics of zigzag and unique slope abruptness under synthetic action of hydraulic force and *** forces existing LWG mapping methods to either focus on the improvement of mapping accuracy or center on the increase of mapping ***,simultaneously achieving accurate and efficient mapping of LWG is still in its infancy under complex topographic ***,we proposed a method that innovatively integrates the loess slope abruptness feature into an improved deep learning semantic segmentation framework for LWG mapping using 0.6 m Google imagery and 5 m DEM *** selected four study areas representing typical loess landforms to test the performance of our *** proposed method can achieve satisfactory mapping results,with the f1 score,mean Intersection-over-Union(mIoU),and overall accuracy of 90.5%,85.3%,and 92.3%,*** addition,the proposed model also showed significant accuracy improvement by inputting additional topographic information(especially the slope of slope).Compared with existing algorithms(Random forests,original DeepLabV3+,and Unet),the proposed approach in this study achieved a better accuracy-efficiency ***,the method can ensure high accuracy and efficiency of the LWG mapping for different loess landform types and can be extended to study various loess gully mapping and water and soil conservation.

关键词： Loess waterworn gully Topographic information Mapping Deep learning Soil erosion Loess plateau

Programmable synthetic receptors:the next-generation of cell and gene therapies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第2期9卷 376-400页

作者： fei Teng Tongtong Cui li Zhou Qingqin Gao Qi Zhou Wei li University of Chinese Academy of Sciences Beijing 101408China State Key Laboratory of Stem Cell and Regenerative Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China

Cell and gene therapies hold tremendous promise for treating a range of difficult-to-treat ***,concerns over the safety and efficacy require to be further addressed in order to realize their full *** receptors,a synthetic biology tool that can precisely control the function of therapeutic cells and genetic modules,have been rapidly developed and applied as a powerful *** designed and engineered,they can be applied to finetune the therapeutic activities,i.e.,to regulate production of dosed,bioactive payloads by sensing and processing user-defined signals or *** review provides an overview of diverse synthetic receptor systems being used to reprogram therapeutic cells and their wide applications in biomedical *** a special focus on four synthetic receptor systems at the forefront,including chimeric antigen receptors(CARs)and synthetic Notch(synNotch)receptors,we address the generalized strategies to design,construct and improve synthetic ***,we also highlight the expanding landscape of therapeutic applications of the synthetic receptor systems as well as current challenges in their clinical translation.

关键词： synthetic landscape payload

Effect of sodium starch octenyl succinate-based Pickering emulsion on the physicochemical properties of hairtail myofibrillar protein gel subjected to multiple freeze-thaw cycles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

food Science and Human Wellness 2024年第2期13卷 1018-1028页

作者： Huinan Wang Jiaxin Zhang Xinran liu Jinxiang Wang Xuepeng li Jianrong li Key Laboratory of food Nutrition and Safety Ministry of EducationCollege of Food Science and EngineeringTianjin University of Science and TechnologyTianjin 300457China College of food Science and Technology Bohai UniversityNational R&D Branch Center of Surimi and Surimi Products ProcessingJinzhou 121013China

A Pickering emulsion based on sodium starch octenyl succinate(SSOS)was prepared and its effects on the physicochemical properties of hairtail myofibrillar protein gels(MPGs)subjected to multiple freeze-thaw(f-T)cycles were *** whiteness,water-holding capacity,storage modulus(G')and texture properties of the MPGs were significantly improved by adding 1%-2%Pickering emulsion(Png emulsion promoted the transformation of secondary structure,enhanced hydrogen bonds and hydrophobic interactions,and promoted the transition of disulfide bond conformation from g-g-g to g-g-t and *** an emulsion concentration of 2%,theα-helix content decreased by 10.37%,while theβ-sheet content increased by 7.94%,compared to the *** f-T cycles,the structure of the MPGs was destroyed,with an increase in hardness and a decrease in whiteness and water-holding capacity,however,the quality degradation of MPGs was reduced with 1%-2%Pickering *** findings demonstrated that SSOS-Pickering emulsions,as potential fat substitutes,can enhance the gel properties and the f-T stability of MPGs.

关键词： Pickering emulsion Myofibrillar protein Gel properties freeze-thaw stability Intermolecular interactions

Arginine promotes seed energy metabolism,increasing wheat seed germination at low temperature

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第4期12卷 1185-1195页

作者： Jiayu li Zhiyuan li Yangyang Tang Jianke Xiao Vinay Nangia Yang liu College of Agronomy Northwest A&F UniversityYangling 712100ShaanxiChina International Center for Agricultural Research in the Dry Areas Rabat 999055Morocco

Low temperatures during germination inhibit seed growth,lead to small and weak seedlings,and significantly reduce the wheat *** the adverse effects of low temperature on wheat seed germination is highly important for achieving high and stable wheat *** this study,Tongmai 6(insensitive)and Zhengmai 113(sensitive),which have different low-temperature sensitivities during germination were treated with low temperature during *** transcriptome,metabolome and physiological data revealed that low temperature decreased the germination rate,downregulated the expression of a large number of genes involved in regulating glycometabolism,and inhibited carbon,nitrogen(especially amino acids)and energy metabolism in the *** content increased at low temperature,and its increase in the low-temperature-tolerant variety was significantly greater than that in the sensitive *** priming experiment showed that treatment with an appropriate concentration of arginine improved the seed germination *** conversion of starch to soluble sugar significantly increased under exogenous arginine conditions,the content of key metabolites in energy metabolism increased,and the utilization of ATP in the seeds *** together,arginine priming increased seed germination at low temperature by relieving inhibition of seed carbon and nitrogen metabolism and improving seed energy metabolism.

关键词： Low temperature Seed germination Arginine Energy metabolism Wheat

Analysis of environmental selection pressure of superoxide dismutase in deep-sea sea cucumber

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第3期42卷 893-904页

作者： Yanan li Zongfu CHEN Haibin ZHAng Ruoyu liU Shuichun CHEN li liN Guangzhou Key Laboratory of Aquatic Animal Diseases and Waterfowl Breeding College of Animal Sciences and TechnologyZhongkai University of Agriculture and EngineeringGuangzhou 510222China Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China College of Marine Science Fujian Agriculture and Forestry UniversityFuzhou 350002China Zhanjiang Tianli Sea Cucumber New Technology Development Co. Ltd.Zhanjiang 524000China

Manganese superoxide dismutase(MnSOD)is an antioxidant that exists in mitochondria and can effectively remove superoxide anions in *** a dark,high-pressure,and low-temperature deep-sea environment,MnSOD is essential for the survival of sea *** MnSODs were identified from the transcriptomes of deep and shallow-sea sea *** explore their environmental adaptation mechanism,we conducted environmental selection pressure analysis through the branching site model of PAML *** obtained night positive selection sites,and two of them were significant(97f→H,134K→V):97f→H located in a highly conservative characteristic sequence,and its polarity c hange might have a great impact on the function of MnSOD;134K→V had a change in piezophilic a bility,which might help MnSOD adapt to the environment of high hydrostatic pressure in the *** further study the effect of these two positive selection sites on MnSOD,we predicted the point mutations of f97H and K134V on shallow-sea sea cucumber by using MAESTROweb and *** show that 97f→H,134K→V might improve MnSOD’s efficiency of scavenging superoxide a nion and its ability to resist high hydrostatic pressure by moderately reducing its *** above results indicated that MnSODs of deep-sea sea cucumber adapted to deep-sea environments through their amino acid changes in polarity,piezophilic behavior,and local *** study revealed the correlation between MnSOD and extreme environment,and will help improve our understanding of the organism’s adaptation mechanisms in deep sea.

关键词： Holothuroidea environmental adaptation positive selection point mutation

Textured Perovskite/Silicon Tandem Solar Cells Achieving Over 30% Efficiency Promoted by 4-fluorobenzylamine Hydroiodide

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第9期16卷 557-570页

作者： Jingjing liu Biao Shi Qiaojing Xu Yucheng li Yuxiang li Pengfei liu Zetong Sunli Xuejiao Wang Cong Sun Wei Han Diannan li Sanlong Wang Dekun Zhang Guangwu li Xiaona Du Ying Zhao Xiaodan Zhang Renewable Energy Conversion and Storage Center Solar Energy Conversion CenterInstitute of Photoelectronic Thin Film Devices and TechnologyNankai UniversityTianjin 300350People’s Republic of China Key Laboratory of Photoelectronic Thin film Devices and Technology of Tianjin Tianjin 300350People’s Republic of China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192People’s Republic of China Engineering Research Center of Thin film Photoelectronic Technology of Ministry of Education Tianjin 300350People’s Republic of China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072People’s Republic of China Center of Single‑Molecule Sciences Institute of Modern OpticsTianjin Key Laboratory of Micro‑Scale Optical Information Science and TechnologyCollege of Electronic Information and Optical EngineeringNankai University38 Tongyan RoadJinnan DistrictTianjin 300350People’s Republic of China Shenzhen Research Institute of Nankai University 16Th FloorYantian Science and Technology BuildingHaishan StreetYantian DistrictShenzhen 518083People’s Republic of China

Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion ***,it is challenging to fabricate high-quality perovskite films and preferred crystal orientation on commercially textured silicon substrates with micrometersize ***,we introduced a bulky organic molecule(4-fluorobenzylamine hydroiodide(f-PMAI))as a perovskite *** is found that f-PMAI can retard the crystallization process of perovskite film through hydrogen bond interaction between f^(−)and fA^(+)and reduce(111)facet surface energy due to enhanced adsorption energy of f-PMAI on the(111)***,the bulky molecular is extruded to the bottom and top of perovskite film after crystal growth,which can passivate interface defects through strong interaction between f-PMA+and undercoordinated Pb^(2+)/I^(−).As a result,the additive facilitates the formation of large perovskite grains and(111)preferred orientation with a reduced trap-state density,thereby promoting charge carrier transportation,and enhancing device performance and *** perovskite/silicon TSCs achieved a champion efficiency of 30.05%based on a silicon thin film tunneling *** addition,the devices exhibit excellent longterm thermal and light stability without *** work provides an effective strategy for achieving efficient and stable TSCs.

关键词： Perovskite crystallization (111)preferred orientation Defect passivation Perovskite/silicon tandem solar cells

Migration and fate of polycyclic aromatic hydrocarbons in bioretention systems with different media:experiments and simulations

在线全文

学校读者我要写书评

暂无评论

frontiers of Environmental Science & Engineering 2024年第4期18卷 17-33页

作者： Zhaoxin Zhang Jiake li Zhe liu Yajiao li Bei Zhang Chunbo Jiang Institute of Land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi’an 710075China State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China College of Landscape Architecture and Art Northwest A&F UniversityYangling 712100China

Polycyclic aromatic hydrocarbons(PAHs)present significant risks to human health owing to their carcinogenic,teratogenic,and mutagenic *** contamination of surface water with PAHs via runoff has become a prominent source of water *** the capacity of bioretention systems to remove PAHs from runoff is recognized,the dynamics of PAH migration and degradation in these systems are not *** study aims to explain the migration and fate of PAHs in bioretention systems through a series of experiments and model *** study constructed bioretention systems with three different media types and found that these systems achieved PAH load reductions exceeding 92%.Notably,naphthalene(NAP),fluoranthene(fLT),and pyrene(PYR)tended to accumulate in the media’s upper layer,at depths of 10 to 40 *** further analyze the migration and fate of PAHs during multi-site rainfall events and across prolonged operation,we applied the HYDRUS-1D model under three distinct *** findings of this study indicated that NAP degraded in 40 d,whereas fLT and PYR showed incomplete degradation after 120 *** continuous rainfall events,there was no clear pattern of PAH accumulation;however,fLT and PYR persisted in the bioretention *** combination of experimental and simulation findings highlights the inevitable accumulation of PAHs during extended use of bioretention *** research provides a theoretical basis for improving operational efficiency,advancing PAH degradation in bioretention systems,and reducing their toxicity.

关键词： Bioretention Polycyclic aromatic hydrocarbons HYDRUS-1D Model simulation Migration

Expanding the targeting scope of CRISPR/Cas9-mediated genome editing by Cas9 variants in Brassica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

aBIOTECH 2024年第2期5卷 202-208页

作者： Wenjing li Xuan li Chunyang Wang Guanzhong Huo Xinru Zhang Jintai Yu Xiaoxiao Yu Jing li Chao Zhang Jianjun Zhao Yan li Jun li State Key Laboratory of North China Crop Improvement and Regulation College of Life SciencesHebei Agricultural UniversityBaoding 071001China Hebei Key Laboratory of Plant Physiology and Molecular Pathology Hebei Agricultural UniversityBaoding 071001China Key Laboratory of Vegetable Germplasm Innovation and Utilization of Hebei Collaborative Innovation Center of Vegetable Industry in HebeiCollege of HorticultureHebei Agricultural UniversityBaoding 071001China College of Modern Science and Technology Hebei Agricultural UniversityBaoding 071001China

CRISPR/Cas9,presently the most widely used genome editing technology,has provided great potential for functional studies and plant ***,the strict requirement for a protospacer adjacent motif(PAM)has hindered the application of the CRISPR/Cas9 system because the number of targetable genomic sites is ***,the engineered variants Cas9-ng,SpG,and SpRY,which recognize non-canonical PAMs,have been successfully tested in plants(mainly in rice,a monocot).In this study,we evaluated the targeted mutagenesis capabilities of these Cas9 variants in two important Brassica vegetables,Chinese cabbage(Brassica rapa ***)and cabbage(Brassica oleracea ***).Both Cas9-ng and SpG induced efficient mutagenesis at ngN PAMs,while SpG outperformed Cas9-ng at ngC and ngT *** achieved efficient editing at almost all PAMs(NRN>NYN),albeit with some self-targeting activity at transfer(T)-DNA *** SpRY-induced mutants were detected in cabbage plants in a PAM-less ***,an adenine base editor was developed using SpRY and TadA8e deaminase that induced A-to-G conversions within target sites using non-canonical ***,the toolboxes developed here induced successful genome editing in Chinese cabbage and *** work further expands the targeting scope of genome editing and paves the way for future basic research and genetic improvement in Brassica.

关键词： Brassica Cas9 variants CRISPR Genome editing Non-canonical PAM

Bioactivity of silk fibroin peptides on vascular endothelial cells

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 Materials Science 2024年第1期18卷 85-94页

作者： Mengnan Dai Meng li Peixuan li Boyu Zhang Jianmei Xu Jiannan Wang National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversityNo.199 Ren-ai RoadSuzhou Industrial ParkSuzhou 215123China

To determine the contribution of non-repetitive domains to the bioactivity of the heavy chain in silk fibroin(Sf)macromolecules,a gene motif f(1)encoding this fragment and its multimers(f(4)and f(8))were biosynthesized from Escherichia coli *** on the positive application potential of Sf materials for the vascular tissue engineering,this study focused on examining the active response of these polypeptides to vascular endothelial *** polypeptides f(1),f(4),and f(8)were separately grafted onto the surfaces of bioinert polyethylene terephthalate(PET)films,resulting in remarkable improvements in the spread and proliferation of human umbilical vein endothelial cells(HUVECs).Using the same grafting dose,the activity of cells on polypeptide-modified PET films enhanced with the increase of the molecular weight of those grafted polypeptides from f(1)to f(8).Meanwhile,the growth of cells on the surface of the alkaline-treated PET film was improved,indicating that the hydrophilicity of the surface material had influence on the growth of ***,on surfaces with the same water contact angle,the spread and proliferation activity of cells on PET films were significantly lower than those on polypeptide-modified PET films.

关键词： silk fibroin heavy chain non-repetitive fragment cytoactive endothelial cell