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    题名 作者 年代 出处 被引量
1H7N9 virulent mutants detected in chickens in China pose an increased threat to humans显示文摘Jianzhong Shi Guohua Deng Huihui Kong Chunyang Gu Shujie Ma Xin Yin Xianying Zeng Pengfei Cui Yan Chen Huanliang Yang Xiaopeng Wan Xiurong Wang Liling Liu Pucheng Chen Yongping Jiang Jinxiong Liu Yuntao Guan Yasuo Suzuki Mei Li Zhiyuan Qu Lizheng Guan Jinkai Zang Wenli Gu Shuyu Han Yangming Song Yuzhen Hu Zeng Wang Linlin Gu Wenyu Yang Libin Liang Hongmei Bao Guobin Tian Yanbing Li Chuanling Qiao Li Jiang Chengjun Li Zhigao Bu Hualan Chen 2017Cell Research2017,27,12:70
2Tree ring based streamflow reconstruction for the Upper Yellow River over the past 1234 years显示文摘We established a Juniperus przewalski tree ring width chronology, based on tree ring cores collected from the A’nyêmaqên Mountains. Statistical analysis showed that the chronology was highly correlated with instrumental streamflow records from previous August to current July from the Tangnaihai Station in the upper reaches of the Yellow River, with a correlation coefficient of 0.656. Streamflow for the upper reaches of the Yellow River was reconstructed for the past 1234 years. Low flow periods for the 11-year averaged streamflow reconstruction were definite as lower than mean plus 1 standard deviation, and high flow periods were higher than mean minus 1 standard deviation. Over the past 1234 years, high flows occurred 18 times, and low flows occurred 12 times. The main low flow periods were identified as AD 1140–1156, AD 1295–1309, AD 1473–1500, and AD 1820–1847, and the main high flow periods were identified as AD 846–873, and AD 1375–1400. Extremely low streamflow over the reconstruction period was seen during the late 15th century, coinciding with a widespread drought phenomenon, which took place in the northeastern Tibetan Plateau over the same period. Reconstructed streamflow shows significant low-frequency variability, which is in line with drought variability of neighboring regions, as inferred from tree rings and other proxies. Multi-taper spectral analysis suggests the existence of significant periods of 2–5, 22, 35–38, 55–62, and 114–227 years, particularly significant for cyclic variations of years 159 and 36.GOU XiaoHua DENG Yang CHEN FaHu YANG MeiXue FANG KeYan GAO LinLin YANG Tao ZHANG Fen 2010Chinese Science Bulletin2010,55,36:37
3Rhizospheric microbial communities are driven by Panax ginseng at different growth stages and biocontrol bacteria alleviates replanting mortality显示文摘The cultivation of Panax plants is hindered by replanting problems, which may be caused by plantdriven changes in the soil microbial community. Inoculation with microbial antagonists may efficiently alleviate replanting issues. Through high-throughput sequencing, this study revealed that bacterial diversity decreased,whereas fungal diversity increased, in the rhizosphere soils of adult ginseng plants at the root growth stage under different ages. Few microbial community, such as Luteolibacter, Cytophagaceae, Luteibacter, Sphingomonas,Sphingomonadaceae, and Zygomycota, were observed; the relative abundance of microorganisms, namely,Brevundimonas, Enterobacteriaceae, Pandoraea, Cantharellales, Dendryphion, Fusarium, and Chytridiomycota,increased in the soils of adult ginseng plants compared with those in the soils of 2-year-old seedlings. Bacillus subtilis 50-1, a microbial antagonist against the pathogenic Fusarium oxysporum, was isolated through a dual culture technique. These bacteria acted with a biocontrol efficacy of 67.8%. The ginseng death rate and Fusarium abundance decreased by 63.3% and 46.1%, respectively, after inoculation with B. subtilis 50-1. Data revealed that microecological degradation could result from ginseng-driven changes in rhizospheric microbial communities;these changes are associated with the different ages and developmental stages of ginseng plants. Biocontrol using microbial antagonists alleviated the replanting problem.Linlin Dong Jiang Xu Lianjuan Zhang Ruiyang Cheng Guangfei Wei He Su Juan Yang Jun Qian Ran Xu Shilin Chen 2018Acta Pharmaceutica Sinica B2018,8,2:27
4LncRNA-HOTAIR inhibition aggravates oxidative stress-induced H9c2 cells injury through suppression of MMP2 by miR-125显示文摘Linlin Li Mengna Zhang Weizhen Chen Ruirui Wang Zi Ye Yanyan Wang Xiao Li Cheguo Cai 2018Acta Biochimica et Biophysica Sinica2018,50,10:20
5A 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau,China using tree-ring records显示文摘This paper presents a 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau using tree-ring records.Tree-ring samples were collected from the Hengduan Mountains in the southeastern part of the Qinghai-Tibet Plateau,China.A nearly 500-year chronology was developed using tree-ring width records.Correlation analysis shows moisture is the main factor limiting tree growth in this region.Ring-widths were significantly positively correlated with the Palmer Drought Severity Index(PDSI) and precipitation in many months.The highest correlation coefficient was found between the annual growth of trees and precipitation from the previous September to the current June(0.738).Based on this relationship,we reconstructed the precipitation history from 1509 to 2006.The reconstruction explains 54.4%(Radj2=53.5%,N=49,F=56.12) of the actual precipitation variation during the calibration period(1958-2006).During the reliable period of the reconstruction(1549-2006),some low-frequency climate signals are included,indicating this region has been getting wetter in the last 20 years.The reconstruction documents six apparently dry and five pluvial periods and the 17th century dry period lasted longer than any other.When compared with other recent studies,this study and these earlier reconstructions show a similar trend in the variation of drought and pluvial.Further spatial correlation analysis confirms that the reconstructed precipitation adequately represents the rainfall history of the entire Hengduan Mountain area.The Multi-taper method,a type of spectral analysis,reveals that precipitation in this area had significant(P<0.01) spectral peaks at 3-5 a,60 a and 79-85 a.GOU XiaoHua YANG Tao GAO LinLin DENG Yang YANG MeiXue CHEN FaHu 2013Chinese Science Bulletin2013,58,10:16
6Ubiquitination of Rheb governs growth factor-induced mTORC1 activation显示文摘Mechanistic target of rapamycin mTOR complex 1 (mTORC1)plays a key role in the integration of various environmental signals to regulate cell growth and metabolism,mTORC1 is recruited to the lysosome where it is activated by its interaction with GTP-bound Rheb GTPase.However,the regulatory mechanism of Rheb activity remains largely unknown.Here,we show that ubiquitination governs the nucleotide-bound status of Rheb.Lysosome-anchored E3 ligase RNF152 catalyzes Rheb ubiquitination and promotes its binding to the TSC complex.EGF enhances the deubiquitination of Rheb through AKT-dependent USP4 phosphorylation,leading to the release of Rheb from the TSC complex.Functionally,ubiquitination of Rheb is linked to mTORC1-mediated signaling and consequently regulates tumor growth.Thus,we propose a mechanistic model whereby Rheb-mediated mTORC1 activation is dictated by a dynamic opposing act between Rheb ubiquitination and deubiquitination that are catalyzed by RNF152 and USP4 respectively.Lu Deng Lei Chen Linlin Zhao Yan Xu Xiaoping Peng Xinbo Wang Lin Ding Jiali Jin Hongqi Teng Yanming Wang Weijuan Pan Fei Yu Lujian Liao Li Li Xin Ge Ping Wang 2019Cell Research2019,29,2:16
7Integrated metabolomic and transcriptomic analyses revealed the distribution of saponins in Panax notoginseng显示文摘Panax notoginseng is famous for its important therapeutic effects. Saponins are bioactive compounds found in different parts and developmental stages of P. notoginseng plants. Thus, it is urgently to study saponins distribution in different parts and growth ages of P. notoginseng plants. In this study,potential biomarkers were found, and their chemical characteristic differences were revealed through metabolomic analysis. High-performance liquid chromatography data indicated the higher content of saponins(i.e., Rg1, Re, Rd, and Rb1) in the underground parts than that in the aerial parts. 20(S)-Protopanaxadiol saponins were mainly distributed in the aerial parts. Additionally, the total saponin content in the 3-year-old P. notoginseng plant(188.0 mg/g) was 1.4-fold higher than that in 2-year-old plant(130.5 mg/g). The transcriptomic analysis indicated the tissue-specific transcription expression of genes, namely, PnFPS, PnSS, PnSE1, PnSE2, and PnDS, which encoded critical synthases in saponin biosyntheses. These genes showed similar expression patterns among the parts of P. notoginseng plants.The expression levels of these genes in the flowers and leaves were 5.2 fold higher than that in the roots and fibrils. These results suggested that saponins might be actively synthesized in the aerial parts and transformed to the underground parts. This study provides insights into the chemical and genetic characteristics of P. notoginseng to facilitate the synthesis of its secondary metabolites and a scientific basis for appropriate collection and rational use of this plant.Guangfei Wei Linlin Dong Juan Yang Lianjuan Zhang Jiang Xu Feng Yang Ruiyang Cheng Ran Xu Shilin Chen 2018Acta Pharmaceutica Sinica B2018,8,3:13
8Meningeal lymphatic vessels regulate brain tumor drainage and immunity显示文摘Recent studies have shown that meningeal lymphatic vessels(MLVs),which are located both dorsally and basally beneath the skull,provide a route for draining macromolecules and trafficking immune cells from the central nervous system(CNS)into cervical lymph nodes(CLNs),and thus represent a potential therapeutic target for treating neurodegenerative and neuroinflammatory diseases.However,the roles of MLVs in brain tumor drainage and immunity remain unexplored.Here we show that dorsal MLVs undergo extensive remodeling in mice with intracranial gliomas or metastatic melanomas.RNA-seq analysis of MLV endothelial cells revealed changes in the gene sets involved in lymphatic remodeling,fluid drainage,as well as inflammatory and immunological responses.Disruption of dorsal MLVs alone impaired intratumor fluid drainage and the dissemination of brain tumor cells to deep CLNs(dCLNs).Notably,the dendritic cell(DC)trafficking from intracranial tumor tissues to dCLNs decreased in mice with defective dorsal MLVs,and increased in mice with enhanced dorsal meningeal lymphangiogenesis.Strikingly,disruption of dorsal MLVs alone,without affecting basal MLVs or nasal LVs,significantly reduced the efficacy of combined anti-PD-1/CTLA-4 checkpoint therapy in striatal tumor models.Furthermore,mice bearing tumors overexpressing VEGF-C displayed a better response to anti-PD-1/CTLA-4 combination therapy,and this was abolished by CCL21/CCR7 blockade,suggesting that VEGF-C potentiates checkpoint therapy via the CCL21/CCR7 pathway.Together,the results of our study not only demonstrate the functional aspects of MLVs as classic lymphatic vasculature,but also highlight that they are essential in generating an efficient immune response against brain tumors.Xueting Hu Qiuping Deng Lu Ma Qingqing Li Yidong Chen Yuhan Liao Fan Zhou Chen Zhang Linlin Shao Jun Feng Tubao He Weihai Ning Yan Kong Yingqing Huo Aibin He Bing Liu Jingjing Zhang Ralf Adams Yulong He Fuchou Tang Xiuwu Bian Jincai Luo 2020Cell Research2020,30,3:11
9Phosphorylcholine polymer nanocapsules prolong the circulation time and reduce the immunogenicity of therapeutic proteins显示文摘蛋白质治疗,治疗学的蛋白质在那里被交付对待混乱,为治疗疾病被认为最安全、很直接的途径。然而,它的应用被有效策略的少量高度为在他们的管理以后在 vivo 交付蛋白质和治疗学的蛋白质的快速的清理限制。这里,我们表明能显著地延长治疗学的蛋白质的发行量时间以及最小化他们的 immunogenicity 的新奇策略。这被与抵抗蛋白质吸附的 crosslinked phosphorylcholine 聚合物的薄层包含单个蛋白质分子完成。通过广泛的细胞的研究,我们证明 crosslinked phosphorylcholine 聚合物壳有效地阻止包含的蛋白质是由巨噬细胞的 phagocytosed,它在 vivo 在 nanoparticles 的清理起一个必要作用。而且,聚合物壳阻止包含的蛋白质被有免疫力的房间识别。作为结果,对治疗学的蛋白质的有免疫力的回答有效地被压制。这个工作描述一个可行方法延长循环时间并且减少治疗学的蛋白质的 immunogenicity,它可以在多样的疾病的治疗支持新奇蛋白质治疗的发展和申请。Sheng Liang Yang Liu Xin Jin Gan Liu Jing Wen Linlin Zhang Jie Li Xubo Yuan Irvin S.Y. Chen Wei Chen Hui Wang Linqi Shi Xinyuan Zhu Yunfeng Lu 2016Nano Research2016,9,4:11
10Dendritic cell-based vaccination with lentiviral vectors encoding ubiquitinated hepatitis B core antigen enhances hepatitis B virus-specific immune responses in vivo显示文摘肝炎 B 病毒(HBV ) 的活动特定的细胞毒素的 T 淋巴细胞(CTL ) 戏在 HBV 的清理的一个占优势的角色。树枝状的房间(DC ) 是关键介绍抗原的房间并且在有免疫力的回答的开始起一个重要作用。我们以前验证了有效地编码 ubiquitinated 肝炎 B 核心抗原(LV-Ub-HBcAg ) 的那 lentiviral 向量导致成熟的 transduced DC,和成熟 DC 高效地导致了 T 房间极化到 Th1 并且产生了 HBcAg 特定的 CTL 前 vivo。在这研究,在 BALB/c 老鼠的 LV-Ub-HBcAg 的 HBV 特定的有免疫力的回答(H-2K d ) 被评估。LV-Ub-HBcAg 的直接注射增加了 cytokines IL-2 和 IFN- 的生产,这被显示出,得到了强壮的抗体回答,并且显著地产生了 IFN-+ 有在 BALB/c 老鼠的 HBV 特定的 CTL 回答的 CD8 + T 房间。另外, LV-Ub-HBcAg 的直接注射导致了有势力 anti-HBV 免疫者回答,类似于得到由的那些在 vitro-transduced DC。在结论,基于 DC 的治疗学的疫苗的 LV-Ub-HBcAg 得到了特定的抗体免疫者回答并且在 vivo 导致了柔韧的特定的 CTL 活动。Shenglan Dai Meng Zhuo Linlin Song Xiaohua Chen Yongsheng Yu Zhenghao Tang Guoqing Zang 2015Acta Biochimica et Biophysica Sinica2015,47,11:9
11Liraglutide alleviates cardiac fibrosis through inhibiting P4hα-1 expression in STZ-induced diabetic cardiomyopathy显示文摘Diabetic cardiomyopathy is an important contributor to morbidity and mortality of diabetic patients by causing heart failure.Interstitial and perivascular fibrosis plays a crucial role in diabetic cardiomyopathy.However,there is a lack of effective specific treatments available for diabetic cardiomyopathy.In the present study,we aim to explore the effects of Liraglutide,a GLP-1 analogue,on diabetic cardiomyopathy in STZ-induced diabetic rats fed with high-fat diet.A total of 60 male Wistar rats were randomly assigned to three groups,i.e.normal group,model group,and Liraglutide group,with 20 rats in each group.Serum levels of TC,TG,LDL-C,NEFA,and hydroxyproline were measured using commercial kits.Cardiac function was evaluated by QRS waves,LVEDd,LVESd,and LVEF.Myocardial fibrosis was measured by immunohistochemistry.Our results demonstrated that chronic administration of Liraglutide decreased the level of blood glucose and significantly alleviated lipid metabolic disturbance compared with the model group.Furthermore,Liraglutide was found to improve the damaged cardiac function.In line with this,we also found that the alleviation of cardiac dysfunction was associated with the decreased fibrosis in diabetic myocardial tissues,which was reflected by the decreased expressions of P4hα-1,COL-1,COL-3,MMP-1,and MMP-9.Our results thus suggest that Liraglutide might have a myocardial protective effect by inhibiting P4hα-1-mediated myocardial fibrosis.Tong Zhao Huiqiang Chen Fei Xu Juan Wang Yusheng Liu Xiaowei Xing Linlin Guo Mingxiang Zhang Qinghua Lu 2019Acta Biochimica et Biophysica Sinica2019,51,3:9
12Multi-omics analyses of 398 foxtail millet accessions reveal genomic regions associated with domestication,metabolite traits,and antiinflammatory effects显示文摘Foxtail millet(Setaria italica),which was domesticatedfromthewild speciesgreenfoxtail(Setaria viridis),isa richsource of phytonutrientsfor humans.To evaluate how breeding changed themetabolome offoxtail millet grains,we generated and analyzed the datasets encompassing the genomes,transcriptomes,metabolomes,and anti-inflammatory indices from 398 foxtail millet accessions.We identified hundreds of common variants that influence numerous secondary metabolites.We observed tremendous differences in natural variations of the metabolites and their underlying genetic architectures between distinct sub-groups of foxtail millet.Furthermore,we found that the selection of the gene alleles associated with yellow grains led to altered profiles of metabolites such as carotenoids and endogenous phytohormones.Using CRiSPR-mediated genome editing wevalidated the function of PHYTOENE SYNTHASE1(PSY1)gene in affecting milletgrain colorand quality.Interestingly,our in vitro cell inflammation assays showed that 83 metabolites in millet grains have anti-inflammatory effects.Taken together,ourmulti-omics study illustrates how the breeding history of foxtail millet has shaped its metabolite profile.The datasets we generated in this study also provide important resources for further understanding how millet grain quality is affected by different metabolites,laying the foundations for future millet genetic research and metabolome-assisted improvement.Xukai Li Jianhua Gao Jingyi Song Kai Guo Siyu Hou Xingchun Wang Qiang He Yanyan Zhang Yakun Zhang Yulu Yang Jiaoyan Tang Hailang Wang Staffan Persson Mingquan Huang Lishuai Xu Linlin Zhong Dongqin Li Yongming Liu Hua Wu Xianmin Diao Peng Chen Xiaowen Wang Yuanhuai Han 2022Molecular Plant2022,15,8:8
13小鼠骨骼肌挫伤后基因表达的时间进程(英文)显示文摘Background:Though the mechanisms of skeletal muscle regeneration are deeply understood,those involved in muscle contusion,one of the most common muscle injuries in sports medicine clinics,are not.The objective of this study is to explore the mechanisms involved in muscle regeneration after contusion injury.Methods:In this study,a total of 72 mice were used.Eight of them were randomly chosen for the control group,while the rest were subjected to muscle contusion.Subsequently,their gastrocnemius muscles were harvested at different time points.The changes in muscle morphology were assessed by hematoxylin and eosin(HE) stain.In addition,the gene expression was analyzed by real-time polymerase chain reaction.Results:The data showed that the expression of many genes,i.e.,specific markers of immune cells and satellite cells,regulatory factors for muscle regeneration,cytokines,and chemokines,increased in the early stages of recovery,especially in the first 3 days.Furthermore,there were strict rules in the expression of these genes.However,almost all the genes returned to normal at 14 days post-injury.Conclusion:The sequence of immune cells invaded after muscle contusion was neutrophils,M1 macrophages and M2 macrophages.Some CC(CCL2,CCL3,and CCL4) and CXC(CXCL10) chemokines may be involved in the chemotaxis of these immune cells.HGF may be the primary factor to activate the satellite cells after muscle contusion.Moreover,2 weeks are needed to recover when acute contusion happens as used in this study.Weihua Xiao Yu Liu Beibei Luo Linlin Zhao Xiaoguang Liu Zhigang Zeng Peijie Chen 2016Journal of Sport and Health Science2016,5,1:8
14Intracellular and Extracellular Phosphatidylinositol 3-Phosphate Produced by Phytophthora Species Is Important for Infection显示文摘Phytophthora 病原体生产的 RxLR 受动器被建议了把 3 磷酸盐(PtdIns (3 ) P ) 绑在 phosphatidylinositol 调停他们的 translocation 进主人房间或到增加他们在 planta 的稳定性。因为在植物的 PtdIns (3 ) P 的层次是低的,我们检验了 Phytophthora 种类是否可以生产 PtdIns (3 ) 支持感染的 P。我们观察了 P 特定的 GFP 生物传感器能绑在 P 的那 PtdIns (3 ) 。parasitica 和 P。sojae hyphae 短暂地在 Nicotiana benthamiana 的感染期间离开 secreting 生物传感器,建议 hyphae 暴露了 PtdIns (3 ) 他们的血浆膜上的 P 或分泌 PtdIns (3 ) P。phosphatidylinositol 3-kinases (PI3K ) 的 Silencing 基因,有 LY294002 的处理,或 PtdIns (3 ) 的表示由 P 的 P 有约束力的蛋白质。sojae 在大豆上减少了病原体的毒力,显示综合病原体的 PtdIns (3 ) P 为完整的毒力被要求。PtdIns (3 ) 的分泌物 P 有约束力的蛋白质或由 N 的 PI3P-5-kinase。benthamiana 叶子显著地由 P 增加了抵抗的水平到感染。parasitica 和 P。capsici。一起,我们的结果支持假设那 Phytophthora 种生产外部 PtdIns (3 ) 帮助感染的 P,例如支持 RxLR 受动器的入口进宿主细胞。我们的结果源于 P。sojae RxLR 受动器 Avr1b 证实 N 终点和这个受动器的 C 终点能绑 PtdIns (3 ) P。Shan Lu 2013Molecular Plant2013,6,5:7
15Resilience-based retrofitting of existing urban RC-frame buildings using seismic isolation显示文摘The improvement of the seismic resilience of existing reinforced-concrete(RC) frame buildings, which is essential for the seismic resilience of a city, has become a critical issue. Although seismic isolation is an effective method for improving the resilient performance of such buildings, target-oriented quantitative improvements of the resilient performance of these buildings have been reported rarely. To address this gap, the seismic resilience of two existing RC frame buildings located in a high seismic intensity region of China were assessed based on the Chinese Standard for Seismic Resilience Assessment of Buildings. The critical engineering demand parameters(EDPs) affecting the seismic resilience of such buildings were identified. Subsequently, the seismic resilience of buildings retrofitted with different isolation schemes(i.e., yield ratios) were evaluated and compared, with emphasis on the relationships among yield ratios, EDPs, and levels of seismic resilience. Accordingly, to achieve the highest level of seismic resilience with respect to the Chinese standard, a yield ratio of 3% was recommended and successfully applied to the target-oriented design for the seismic-resilience improvement of an existing RC frame building. The research outcome can provide an important reference for the resilience-based retrofitting of existing RC frame buildings using seismic isolation in urban cities.Yang Cantian Xie Linlin Li Aiqun Zeng Demin Jia Junbo Chen Xi Chen Min 2020Earthquake Engineering and Engineering Vibration2020,19,4:7
16Progress in electrochemical lithium ion pumping for lithium recovery显示文摘Accelerating the development of lithium resources has attracted a great deal of attention with the explosive growth of new energy vehicles.As a new technology,electrochemical lithium ion pumping(ELIP)is featured by environment-friendly,low energy consumption and high efficiency.This review summarizes the research progress in ELIP,and focuses on the evaluation methods,electrode materials and electrochemical systems of ELIP.It can be concluded that ELIP is expected to achieve an industrial application and has a promising prospect.In addition,challenges and perspective of electrochemical lithium extraction are also highlighted.Guolang Zhou Linlin Chen Yanhong Chao Xiaowei Li Guiling Luo Wenshuai Zhu 2021Journal of Energy Chemistry2021,30,8:6
17Synthesis of chain-like MoS_2 nanoparticles in W/O reverse microemulsion and application in photocatalysis显示文摘Chain-like MoS2assemblies consisting of hexagonal MoS2nanoparticles(20-60 nm) have been successfully synthesized in a Triton X-100/cyclohexane/hexanol/water W/O reverse microemulsion in the presence of(NH 4)2MoS 4 as the molybdenum source and NH2OH·HCl as the reducing agent.The products were characterized by X-ray powder diffraction(XRD),transmission electron microscopy(TEM) and UV-vis diffuse reflectance absorption spectra.The influence of synthetic parameters such as acidity,water/oil ratio(0),aging time and annealing temperature on the formation of MoS2assemblies was investigated.TEM analysis showed that these synthetic factors played important roles in controlling the size of MoS2nanoparticles and the length of the chain-like MoS2assemblies.XRD analysis indicated that the well-crystallized MoS2nanoparticles could be obtained by annealing the precursors at 700 C for2h under a flow of N2atmosphere.In addition,the as-prepared chain-like MoS2nanoparticles exhibited excellent photocatalytic H2activity in Ru(bpy) 3 2+-MoS2-H2A three-component molecular systems under visible light irradiation.LIU MeiYing LI XiaoQian XU ZhiLing LI BoNa CHEN LinLin SHAN NanNan 2012Chinese Science Bulletin2012,57,30:6
18Seasonal and Interannual Variations of Carbon Exchange over a Rice–Wheat Rotation System on the North China Plain显示文摘Rice–wheat(R–W) rotation systems are ubiquitous in South and East Asia,and play an important role in modulating the carbon cycle and climate. Long-term,continuous flux measurements help in better understanding the seasonal and interannual variation of the carbon budget over R–W rotation systems. In this study,measurements of CO2 fluxes and meteorological variables over an R–W rotation system on the North China Plain from 2007 to 2010 were analyzed. To analyze the abiotic factors regulating Net Ecosystem Exchange(NEE),NEE was partitioned into gross primary production(GPP) and ecosystem respiration. Nighttime NEE or ecosystem respiration was controlled primarily by soil temperature,while daytime NEE was mainly determined by photosythetically active radiation(PAR). The responses of nighttime NEE to soil temperature and daytime NEE to light were closely associated with crop development and photosynthetic activity,respectively. Moreover,the interannual variation in GPP and NEE mainly depended on precipitation and PAR. Overall,NEE was negative on the annual scale and the rotation system behaved as a carbon sink of 982 g C m-2per year over the three years. The winter wheat field took up more CO2 than the rice paddy during the longer growing season,while the daily NEE for wheat and rice were-2.35and-3.96 g C m-2,respectively. After the grain harvest was subtracted from the NEE,the winter wheat field became a moderately strong carbon sink of 251–334 g C m-2per season,whereas the rice paddy switched to a weak carbon sink of107–132 per season.CHEN Chen LI Dan GAO Zhiqiu Jianwu TANG GUO Xiaofeng WANG Linlin WAN Bingcheng 2015Advances in Atmospheric Sciences2015,32,10:6
19First demonstration of 1.3μm quarter-wavelength shift distributed feedback(DFB) semiconductor laser based on conventional photolithography显示文摘A 1.3 μm distributed feedback(DFB) semiconductor laser with equivalent λ/4 phase shift based on reconstruction equivalent chirp(REC) technique is numerically studied and experimentally demonstrated.The simulation results show that the 1.3 μm DFB laser with equivalent λ/4 phase shift based on the REC technique performs the same as that of actual λ/4 phase shift DFB laser,with nearly the same P-I curves,the internal power distributions and the output ASE spectra.Compared with the traditional λ/4 phase shift DFB laser,the REC based laser only changes the sampling structures with the uniform seed waveguide grating instead of the actual grating structures.As a result,the fabrication of such laser will be very easy.In this paper,we successfully fabricated the 1.3 μm DFB laser based on the REC technique for the first time to the best of our knowledge.LU LinLin SHI YueChun CHEN XiangFei 2013Chinese Science Bulletin2013,58,7:6
20Excessive gestational weight gain in early pregnancy and insufficient gestational weight gain in middle pregnancy increased risk of gestational diabetes mellitus显示文摘Background:Gestational weight gain(GWG)is associated with the risk of gestational diabetes mellitus(GDM).However,the effect of weight gain in different trimesters on the risk of GDM is unclear.This study aimed to evaluate the effect of GWG on GDM during different trimesters.Methods:A birth cohort study was conducted from 2017 to 2020 in Shenzhen,China.In total,51,205 participants were included comprising two models(early pregnancy model and middle pregnancy model).Gestational weight(kg)was measured at each prenatal clinical visit using a standardized weight scale.Logistic regression analysis was used to assess the risk of GDM.Interaction analysis and mediation effect analysis were performed in the middle pregnancy model.Results:In the early pregnancy model,the risk of GDM was 0.858 times lower(95%confidence interval[CI]:0.786,0.937)with insufficient GWG(iGWG)and 1.201 times higher(95%CI:1.097,1.316)with excessive GWG after adjustment.In the middle pregnancy model,the risk of GDM associated with iGWG increased 1.595 times(95%CI:1.418,1.794)after adjustment;for excessive GWG,no significant difference was found(P=0.223).Interaction analysis showed no interaction between GWG in early pregnancy(GWG-E)and GWG in middle pregnancy(GWG-M)(F=1.268;P=0.280).The mediation effect analysis indicated that GWG-M plays a partial mediating role,with an effect proportion of 14.9%.Conclusions:eGWG-E and iGWG-M are associated with an increased risk of GDM.Strict control of weight gain in early pregnancy is needed,and sufficient nutrition should be provided in middle pregnancy.Aiqi Yin Fuying Tian Xiaoxia Wu Yixuan Chen Kan Liu Jianing Tong Xiaonian Guan Huafan Zhang Linlin Wu Jianmin Niu 2022Chinese Medical Journal2022,,9:5
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