检索结果-南通市图书馆

Does scatter-hoarding of seeds benefit cache owners or pilferers?

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2017年第6期12卷 477-488页

作者： Haifeng GU qingjian ZHAO Zhibin ZHANG State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

The scatter-hoarding behavior of granivorous rodents plays an important role in seed dispersal and seedling regeneration of trees,as well as the evolution of several well-known mutualisms between trees and rodents in forest *** it is difficult to identify seed hoarders and pilferers under field conditions by traditional methods,the full costs incurred and benefits accrued by scatter-hoarding have not been fully evaluated in most *** using infrared radiation camera tracking and seed tagging,we investigated the benefits and losses of scatter-hoarded seeds(Camellia oleifera)for 3 sympatric rodent species(Apodemus draco,Niviventer confucianus and Leopoldamys edwardsi)in a subtropical forest of Southwest China during 2013 to *** established the relationships between the rodents and the seeds at the individual *** each rodent species,we calculated the cache recovery rate of cache owners,as well as conspecific and interspecific pilferage *** found that all 3 sympatric rodent species had a cache recovery advantage with rates that far exceeded average pilferage rates over a 30-day tracking *** smallest species(***)showed the highest rate of scatter-hoarding and the highest recovery advantage compared with the other 2 larger species(*** and ***).Our results suggest that scatter-hoarding benefits cache owners in food competition,supporting the pilferage avoidance ***,scatter-hoarding behavior should be favored by natural selection,and plays a significant role in species coexistence of rodent community and in the formation of mutualism between seeds and rodents in forest ecosystems.

关键词： Chinese white-bellied rat Edward’s long-tailed rat oil tea scatter-hoarding benefits South China field mouse

Mechanical Force Remodeling the Adult Brain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2023年第5期39卷 877-879页

作者： Chen Zhang Shuai Liu Yong-Chun Yu qingjian Han State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200032China

The interactions between neural stem cells(NSCs)and their niche are essential for their maintenance,proliferation,differentiation,and migration,which contribute to brain plasticity,learning and memory,and cognition[1].As one of the key components of the NSC niche,astrocytes are vital in regulating the processes underlying brain development such as neuro-/gliogenesis,angiogenesis,axonal outgrowth,synaptogenesis,and synaptic pruning[2].Chemical and electrical signals mediated by adhesion molecules,the extracellular matrix,paracrine secretion.

关键词： vital maintenance migration

Two decades of suspect evidence for adaptive molecular evolution——negative selection confounding positive-selection signals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2022年第5期9卷 129-141页

作者： Qipian Chen Hao Yang Xiao Feng qingjian Chen Suhua Shi Chung-Ⅰ Wu Ziwen He State Key Laboratory of Biocontrol Guangdong Key Laboratory of Plant Resources School of Life SciencesSouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Sun Yat-sen University

There has been a large literature in the last two decades affirming adaptive DNA sequence evolution between *** main lines of evidence are from(i) the McDonald-Kreitman(MK) test,which compares divergence and polymorphism data,and(ii) the phylogenetic analysis by maximum likelihood(PAML) test,which analyzes multispecies divergence ***,we apply these two tests concurrently to genomic data of Drosophila and *** our surprise,the> 100 genes identified by the two tests do not overlap beyond random *** the non-concordance could be due to low powers leading to high false negatives,we merge every 20-30 genes into a 'supergene'.At the supergene level,the power of detection is large but the calls still do not *** rule out methodological reasons for the *** particular,extensive simulations fail to find scenarios whereby positive selection can only be detected by either MK or PAML,but not *** molecular evolution is governed by positive and negative selection concurrently,a fundamental assumption for estimating one of these(say,positive selection) is that the other is ***,in a broad survey of primates,birds,Drosophila and Arabidopsis,we found that negative selection rarely stays constant for long in *** a consequence,the variation in negative selection is often misconstrued as a signal of positive *** conclusion,MK,PAML and any method that examines genomic sequence evolution has to explicitly address the variation in negative selection before estimating positive *** a companion study,we propose a possible path forward in two stages—first,by mapping out the changes in negative selection and then using this map to estimate positive *** now,the large literature on positive selection between species has to await reassessment.

关键词： molecular evolution neutral theory natural selection

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

残膜回收机有效作业面积监测系统设计研究

农机化研究 2025年第1期47卷 54-60页

作者：王德阳张若宇段宏伟翟志强付宇轩孟庆建石河子大学机械电气工程学院新疆石河子832003 农业农村部西北农业装备重点实验室新疆石河子832003

为便于新疆棉田残膜回收的精准作业收费和补贴,设计了一种残膜回收机有效作业面积监测系统。通过仿真试验对比锁相放大器降噪前后残膜回收机作业时经纬度数据,得出锁相滤波对于噪声环境有较好的抗干扰性能;采用高斯投影正算方法将降噪... 详细信息

为便于新疆棉田残膜回收的精准作业收费和补贴,设计了一种残膜回收机有效作业面积监测系统。通过仿真试验对比锁相放大器降噪前后残膜回收机作业时经纬度数据,得出锁相滤波对于噪声环境有较好的抗干扰性能;采用高斯投影正算方法将降噪后经纬度数据转化为平面坐标,得出1.5°带的高斯投影的相对误差相较于3°带降低了0.01%。同时,利用卡尔曼滤波算法和构成角方法筛选有效作业轨迹,使用缓冲区法计算重复作业面积,最终利用轨迹算法精准获取残膜回收机有效作业面积,得出所设计的残膜回收机有效作业面积监测系统对于大块农田测量时相对误差为2.6%,对于小块农田测量时相对误差为3.3%。研究结果表明:所设计的残膜回收机有效作业面积监测系统可以精确计算出残膜回收机的有效作业面积,为残膜回收机作业质量评估提供了一定的理论基础。

关键词：北斗导航作业面积监测高斯投影卡尔曼滤波缓冲区算法

维普期刊数据库博看期刊

A tunable, rapid, and precise drug control of protein expression by combining transcriptional and post-translational regulation systems

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2020年第11期47卷 705-712页

作者： Li Li Hongyi Meng Jianmin Zhang Yang Liu qingjian Zou Yi Gao Huaqiang Yang Liangxue Lai Department of Hepatobiliary Surgery II Guangdong Provincial Research Center for Artificial Organ and Tissue EngineeringInstitute of Regenerative MedicineZhujiang HospitalSouthern Medical UniversityGuangzhou510282China CAS Key Laboratory of Regenerative Biology Guangdong Provincial Key Laboratory of Stem Cell and Regenerative MedicineSouth China Institute for Stem Cell Biology and Regenerative MedicineGuangzhou Institutes of Biomedicine and HealthChinese Academy of SciencesGuangzhou510530China School of Biotechnology and Health Sciences Wuyi UniversityJiangmen529020China College of Animal Science South China Agricultural UniversityGuangzhou510642China

Rapid,precise,and tunable regulation of protein abundance would be significantly useful in a variety of biotechnologies and biomedical ***,we describe a system that allows tunable and rapid drug control of gene expression for either gene activation or inactivation in mammalian *** construct the system by coupling Tet-on 3 G and small molecule-assisted shutoff systems,which can respectively induce transcriptional activation and protein degradation in the presence of corresponding small *** dual-input drug inducer regulation system facilitates a bidirectional control of gene *** gene of interest can be precisely controlled by dual small molecules in a broad dynamic range of expression from overexpression to complete silence,allowing gene function study in a comprehensive expression *** results reveal that the bidirectional control system enables sensitive dosage-and time-dependent regulation for either turn-on or shutoff of gene *** also apply this system for inducible genome editing and gene activation mediated by clustered regularly interspaced short palindromic *** system provides an integrated platform for studying multiple biological processes by manipulating gene expression in a more flexible way.

关键词： Protein abundance Tet-on 3G SMASh Gene expression CRISPR Small molecule

Fine Characterization and Analysis of Drying Strain of the ELM Board via DIC Technology

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第2期11卷 567-580页

作者： Yuanchu Liu Xiaodong Zhu Zhengmin Jin Yingying Liu qingjian Wei Bonan Liang Yingchun Cai Jingyao Zhao Key Laboratory of Bio-Based Material Science and Technology(Ministry of Education) College of Material Science and EngineeringNortheast Forestry UniversityHarbin150040China

In this paper,the occurrence and development mechanism of strain on the cross-section during the wood drying is ***,strain regularity on the cross-section of 50 mm thickness elm(Ulmus rubra)board at the temperature of 40℃and 80℃is detected via digital image correlation ***,the difference between tangential and radial strain at surface and core layers was *** results showed that strain distribution in the width direction of the board is ***,a large drying shrinkage strain occurs at the near-core layer,while the maximum strain difference reaches 4.08%.Hence,the surface of the board is cracked along the thickness *** radial strain of the board is higher than the tangential strain in the early stage of drying,while these strains are reversed in the later stage of *** temperature is related to the difference between the tangential and radial strains of the elm *** differences at the core layer are larger than those of the surface *** conducted research results provide a theoretical basis for process optimization.

关键词： Digital image correlation technology drying strain fine characterization moisture content distribution

Detection and analysis of anti-latent membrane protein 2A antibodies in the sera of patients with Epstein-Barr virus associated malignancies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2005年第9期118卷 725-730页

作者： CHENYun YAOKun SUNHua qingjian PENGGuang-yong DepartmentofMicrobiologyandImmunology NanjingMedicalUniversityNanjing210029China CollegeofEnglish HehaiUniversityNanjing210098China CenterforCellandGeneTherapy BaylorCollegeofMedicineHoustonTexas77054USA

Background Epstein-Barr virus (EBV) associated malignancies with a Type Ⅱ latency gene expression pattern, such as Hodgkin’s disease, and nasopharyngeal carcinoma (NPC), frequently express the EBV antigen latent membrane protein 2A (LMP2A). We expected to establish a highly expressing LMP2A yeast cell strain and get the high quality LMP2A protein, which was used for detection, analysis and characterization of its antibodies in various patients’ sera of EBV associated *** The plasmid pPICZαA-LMP2A containing the full length of LMP2A cDNA was constructed and transformed to Pichia pastoris GS115 to express LMP2A protein. After fermentation and purification, the LMP2A protein was used as an antigen to detect anti-LMP2A antibodies (Abs) in the sera of patients with EBV-associated malignancies in enzyme linked immunosorbent assay (ELISA) or *** LMP2A was expressed successfully with an expected molecular weight of approximately 54 kD and Abs to LMP2A were strikingly specific to NPC. Two-thirds or more sera from NPC patients were positive for anti-LMP2A immunoglobulin G (IgG) Abs. The antibodies were absent from the sera of other EBV-associated diseases except a small fraction of the gastric carcinoma. Comparing anti-viral capsid Ags (VCA) IgA and LMP2A IgA titers in the sera from 76 NPC patients, only 55% were positive for anti-LMP2A IgA Abs while 70% were positive for anti-VCA IgA. However, we found that 3 sera negative for VCA IgA were positive for LMP2A *** The results suggested the potential significance of LMP2A specific Abs for the diagnosis of EBV-associated malignancies, especially NPC.

关键词： latent membrane 2 pastoris nasopharyngeal cancer malignancies

Sympathetic Nerve Mediated Spinal Glia Activation Underlies Itch in a Cutaneous T-Cell Lymphoma Model

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2022年第4期38卷 435-439页

作者： Fang Tong Qianru He Wan-Jie Du Huan Yang Dongping Du Shaofeng Pu qingjian Han State Key Laboratory of Medical Neurobiology and MOE Frontier Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200433China Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education Co-Innovation Center of NeuroregenerationJiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury RepairNantong UniversityNantong 226001China Pain Management Center Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200233China

Dear Editor,Cancer-associated itch can be described as pruritus associated with *** intractable itch associated with specific types of cancer afflicts patients badly,few effective treatments are available due to limit... 详细信息

关键词： malignancy cancer Cancer

THE GUIDING ROLE OF CHINA-AFRICA COOPERATION IN ADVANCING THE BELT AND ROAD INITIATIVE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Contemporary World 2018年第3期 37-40页

作者： LIU qingjian the school of international studies renmin university of china

China-proposed Belt and Road Initiative provides a huge and inclusive platform for the cooperation between China and developing countries in Asia, Africa and Latin America. China-Africa cooperation, as creative and historic experience of South-South cooperation, has played a leading role in promoting the cooperation between China and the develop- ing countries in Asia, Africa and Latin America under the Belt and Road Initiative. The leading role of China-Africa cooperation is visible four aspects.

关键词：一带一路中国经济发展发展现状