检索结果-南通市图书馆

Cloning and Characterization of Genes Coding for Fructan Biosynthesis Enzymes (FBEs) in Triticeae Plants

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

Agricultural Sciences in China 2010年第3期9卷 313-324页

作者： GAO Xiang SHE Mao-yun yin Gui-xiang YU Yang qiao Wei-hua DU Li-pu YE Xing-guo National Key Facility of Crop Gene Resources and Genetic Improvement Key Laboratory of Crop Genetics and Breeding Ministry of Agriculture/Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

Fructan is not only a carbon source for storage but also plays an important role as anti-stress agents in many plant species. Complex fructans having both β-（2,1）- and β-（2,6）-linked fructosyl units accumulate in Triticeae plants commonly. Three enzymes （sucrose： sucrose 1-fructosyltransferase, 1-SST, EC： 2.***.1.99; sucrose： fructan 6-fructosyltransferase, 6- SFT, EC： 2.***.1.10; and fructan： fructan 1-fructosyltransferase, 1-FFT, EC： 2.***.1.100） were involved in fructan biosynthesis in Triticeae plant species. We successfully isolated these genes from tetraploid wheat （Triticum turgidum, genotype： AABB）, common wheat （Triticum aestivum L., genotype： AABBDD） and three wild relatives of common wheat, Triticum urartu Thum. （the origin of the AA genome）, Aegilops speltoides （Tausch） Gren. （the putative source of the SS genome） and Aegilops tauschii Coss. （the source of the DD genome）. Sequence analysis revealed that all the FBEs （fructan biosynthetic enzymes） had three highly conserved functional motifs except 1-SST （EU981912） from tetraploid wheat species only with conserved DPNG. Low pI （isoelectric point） and potential N-glycosylation sites were predicted, which were crucial for protein compartmentation and post-translational process. Analysis on subcelluar localization signals showed that only 6-SFT had vacuolar-directed signal. Sequences alignment result showed that 1-SST and 1-FFT were more conservative and had closer relationship each other, while 6-SFT was more active during the evolution processing. According to the syntenic relationship between wheat and rice genome, FBEs were predicated to be located on the homeologous group 6 and group 2 chromosomes. Expression profile confirmed that expression of all the three FBEs were drought-stress induced. This study can assist to establish a useful theoretical platform for cold- or drought-tolerant improvement of wheat by modulating FBEs expression.

关键词： fructans fructan biosynthesis enzymes gene structure wheat evolution

The long-term prediction of the oil-contaminated water from the Sanchi collision in the East China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第3期37卷 69-72页

作者： yin Liping ZHANG Min ZHANG Yuanling qiao Fangli The First Institute of Oceanography State Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Key Laboratory of Marine Science and Numerical Modelling State Oceanic Administration Key Laboratory of Data Analysis and Applications State Oceanic Administration

The condensate and bunker oil leaked from the Sanchi collision would cause a persistent impact on marine ecosystems in the surrounding areas. The long-term prediction for the distribution of the oil-polluted water and the information for the most affected regions would provide valuable information for the oceanic environment protection and pollution assessment. Based on the operational forecast system developed by the First Institute of Oceanography, State Oceanic Administration, we precisely predicted the drifting path of the oil tanker Sanchi after its collision. Trajectories of virtual oil particles show that the oil leaked from the Sanchi after it sank is mainly transported to the northeastern part of the sink location, and quickly goes to the open ocean along with the Kuroshio. Risk probability analysis based on the outcomes from the operational forecast system for years 2009 to2017 shows that the most affected area is at the northeast of the sink location.

关键词： Sanchi collision long-term prediction oil spill

Private Keyword-Search for Database Systems Against Insider Attacks

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2017年第3期32卷 599-617页

作者： Peng Jiang Yi Mu Fuchun guo qiao-Yan Wen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Centre for Computer and Information Security Research School of Computing and Information Technology University of Wollongong Wollongong NSW 2522 Australia

The notion of searchable encrypted keywords introduced an elegant approach to retrieve encrypted data without the need of decryption. Since the introduction of this notion, there are two main searchable encrypted keywords techniques, symmetric searchable encryption （SSE） and public key encryption with keyword search （PEKS）. Due to the complicated key management problem in SSE, a number of concrete PEKS constructions have been proposed to overcome it. However, the security of these PEKS schemes was only weakly defined in presence of outsider attacks;therefore they suffer from keyword guessing attacks from the database server as an insider. How to resist insider attacks remains a challenging problem. We propose the first searchable encrypted keywords against insider attacks （SEK-IA） framework to address this problem. The security model of SEK-IA under public key environment is rebuilt. We give a concrete SEK-IA construction featured with a constant-size trapdoor and the proposed scheme is formally proved to be secure against insider attacks. The performance evaluations show that the communication cost between the receiver and the server in our SEK-IA scheme remains constant, independent of the sender identity set size, and the receiver needs the minimized computational cost to generate a trapdoor to search the data from multiple senders.

关键词： public key encryption with keyword search keyword privacy insider attack searchable encrypted keyword

The competition between Bidens pilosa and Setaria viridis alters soil microbial composition and soil ecological function

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 Integrative Agriculture 2024年第1期23卷 267-282页

作者： qiao Li Jianying guo Han Zhang Mengxin Zhao State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China College of Life Science Yangtze UniversityJingzhou 434025China

Bidens pilosa is recognized as one of the major invasive plants in *** invasion has been associated with significant losses in agriculture,forestry,husbandry,and *** ecosystems play an important role in alien plant *** within the soil act as intermediaries between plants and soil ecological functions,playing a role in regulating soil enzyme activities and nutrient *** the interactions between invasive plants,soil microorganisms,and soil ecological processes is vital for managing and mitigating the impacts of invasive species on the *** this study,we conducted a systematic analysis focusing on *** and Setaria viridis,a common native companion plant in the invaded *** simulate the invasion process of ***,we constructed homogeneous plots consisting of *** and *** grown separately as monocultures,as well as in *** rhizosphere and bulk soils were collected from the alien plant *** and the native plant *** order to focus on the soil ecological functional mechanisms that contribute to the successful invasion of ***,we analyzed the effects of *** on the composition of soil microbial communities and soil ecological *** results showed that the biomass of *** increased by 27.51% and that of *** was significantly reduced by 66.56%.The organic matter contents in the bulk and rhizosphere soils of *** were approximately 1.30 times those in the native plant *** TN and NO_(3)^(-)contents in the rhizosphere soil of *** were 1.30 to 2.71 times those in the native plant *** activities of acid phosphatase,alkaline phosphatase,and urease in the rhizosphere soil of *** were 1.98-2.25 times higher than in the native plant *** high-throughput sequencing of the16S rRNA gene,we found that *** altered the composition of the soil microbial ***,many genera in Actinobacteria and Proteobacteri

关键词： plant invasion Bidens pilosa soil microbial composition soil properties soil enzyme activities

Fe-Mn interdiffusion in aluminosilicate garnets

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第1期15卷 118-125页

作者： Yanjun yin Baohua Zhang Xinzhuan guo Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior Institute of GeochemistryChinese Academy of SciencesGuiyang 550081GuizhouChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Big Data in Geosciences and Deep Earth Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China

Precise determination of cation diffusivity in garnet can provide critical information for quantitatively understanding the timescales and thermodynamics of various geological processes,but very few studies have been performed for Fe-Mn *** this study,Fe-Mn interdiffusion rates in natural single crystals of Mn-bearing garnet with 750 ppm H2O are determined at 6 GPa and 1273-1573 K in a Kawai-type multi-anvil *** profiles were acquired by electron microprobe and fitted using Boltzmann-Matano *** experimental results show that the Fe-Mn interdiffusion coefficient(DFe-Mn)slightly decreases with increasing *** experimentally determined DFe-Mn in Mn-bearing garnet can be fitted by the Arrhenius equation:DFe-Mn(m2/s)=D0XFenexp(-E*/RT),where E*=(1-XFe)E*Mn+XFeE*Fe,D0=8.06-6.04+9.87×10-9 m2/s,E*Mn=248±27 KJ/mol,E*Fe=226±59 KJ/mol,n=-1.36±*** comparing the present results with previous experimental data suggest that water can greatly enhance the DFe-Mn in *** results indicate that the time required for homogenization of the compositional zoning of a garnet is much shorter than previously thought.

关键词： Fe-Mn interdiffusion Diffusion coefficient Garnet High pressure experiment Water

Nutritional regulation of skeletal muscle energy metabolism, lipid accumulation and meat quality in pigs

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

Animal Nutrition 2023年第3期14卷 185-192页

作者： Enfa Yan Jianxin guo Jingdong yin State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

The quality of pork determines consumers’ purchase intention, which directly affects the economic value of pork. Minimizing the proportion of inferior pork and producing high quality pork are the ultimate goals of the pig industry. Muscle energy metabolism, serving as a regulative hub in organism energy expenditure and storage as a fat deposit, is compatible with myofiber type composition, affecting meat color, intramuscular fat content, tenderness, p H values and drip loss. Increasing data illustrate that dietary nutrients and bioactive ingredients affect muscle energy metabolism, white adipose browning and fat distribution, and myofiber type composition in humans, and rodents. Recently, some studies have shown that modulating muscle energy metabolism and lipid accumulation through nutritional approaches could effectively improve meat quality. This article reviews the progress and development in this field, and specifically discusses the impacts of dietary supply of amino acids, lipids, and gut microbiota as well as maternal nutrition on skeletal muscle energy metabolism, lipid accumulation and meat quality of pigs, so as to provide comprehensive overview with respect to effective avenues for improving meat quality.

关键词： Amino acids Fatty acid profile Gut microbiota Maternal nutrition Skeletal muscle Meat quality

A New Sufficient Degree Condition for a Graphic Sequence to Be Forcibly k-Edge-Connected

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2022年第1期38卷 223-228页

作者： Jian-hua yin Ji-yun guo School of Science Hainan UniversityHaikou 570228China

A graphic sequence π =(d1, d2,..., dn) is said to be forcibly k-edge-connected if every realization of π is k-edge-connected. In this paper, we obtain a new sufficient degree condition for π to be forcibly k-edgeconnected. We also show that this new sufficient degree condition implies a strongest monotone degree condition for π to be forcibly 2-edge-connected and a conjecture about a strongest monotone degree condition for π to be forcibly 3-edge-connected due to Bauer et al.(Networks, 54(2)(2009) 95-98), and also implies a strongest monotone degree condition for π to be forcibly 4-edge-connected.

关键词： graphic sequence forcibly k-edge-connected graphic sequence a strongest monotone degree condition

Heterogeneity in supraglacial debris thickness and its role in glacier mass changes of the Mount Gongga

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第1期59卷 170-184页

作者： ZHANG Yong HIRABAYASHI Yukiko FUJITA Koji LIU Shi yin LIU qiao State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Institute of Engineering Innovation The University of Tokyo Graduate School of Environmental Studies Nagoya University Institute of Mountain Hazards and Environment Chinese Academy of Sciences

In the Tibetan Plateau, many glaciers have extensive covers of supraglacial debris in their ablation zones, which affects glacier response to climate change by altering ice melting and spatial patterns of mass loss. Insufficient debris thickness data make it difficult to analyze regional debris-cover effects. Maritime glaciers of the Mount Gongga have been characterized by a substantial reduction in glacier area and ice mass in recent decades. The thermal property of the debris layer estimated from remotely sensed data reveals that debris-covered glaciers are dominant in this region, on which the proportion of debris cover to total glacier area varies from 1.74% to 53.0%. Using a physically-based debris-cover effect assessment model, we found that although the presence of supraglacial debris has a significant insulating effect on heavily debris-covered glaciers, il accelerates ice melting on -10.2% of total ablation zone and produces rapid wastage of -25% of the debris-covered glaciers, leading to the similar mass losses between the debris-covered and debris-free glaciers. Widespread debris cover also facilitates the development of active terminus regions. Regional differences in debris-cover effects are apparent, highlighting the im- portance of debris cover for understanding glacier mass changes in the Tibetan Plateau and other mountain ranges around the world.

关键词： Debris-cover effect Ice melting Maritime glacier Glacier status Mount Gongga

Probing into the Yield Plateau Phenomenon in Commercially Pure Titanium During Tensile Tests

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 701-709页

作者： Xiaohui Shi Zuhan Cao Zhiyuan Fan Ruipeng guo Junwei qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China

To explain the intrinsic mechanism of the yield plateau phenomenon in commercially pure titanium,the tensile behaviors of commercially pure titanium specimens after 91.6%cryorolling and subsequent annealing at 280℃,335℃,450℃and 600℃have been *** results show that the yield plateau phenomenon is a result of dislocation behaviors controlled by grain size and thus only exists within a given range of mean grain size.αgrain boundaries are the main dislocation multiplication sources of commercially pure ***-grained microstructure could offer numerous dislocation multiplication locations during *** the applied stress is above the yielding strength,dislocations multiply rapidly and the mobile dislocation density is *** retrieve the imposed strain rate,the mean dislocation velocity is bound to be ***,it takes time for them to interact with each *** a result,the movement of dislocations is hardly blocked and the deformation could continue at a nearly constant applied ***,the so-called yield plateau behavior presents in the tensile *** disappearance of yield plateau phenomenon in coarse-grained and ultrafi ne-grained microstructures is attributed to the quick realization of the mutual interactions among dislocations at the initial stage of tensile test.

关键词： Yield plateau Commercially pure titanium Tensile test Grain size Dislocation