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249篇 您的检索式:作者名="YU Xiaofeng"
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1Occurrence and Fate of Antibiotics in the Aqueous Environment and Their Removal by Constructed Wetlands in China: A review显示文摘Overuse of antibiotics has become a serious ecological problem worldwide.There is growing concern that antibiotics are losing their effectiveness due to an increased antibiotic resistance in bacteria.During the last twenty years,consumption of antibiotics has increased rapidly in China,which has been cited as one of the world's worst abusers of antibiotics.This review summarizes the current state of antibiotic contamination in China's three major rivers(the Yangtze River,Yellow River,and Pearl River) and illustrates the occurrence and fate of antibiotics in conventional municipal wastewater treatment plants(WWTPs).The analytical data indicate that traditional WWTPs cannot completely remove these concerned pharmaceuticals,as seen in the large difference between the distribution coefficient(K_d) and the uneven removal efficiency of various types of antibiotics.Although constructed wetlands(CWs)offer a potential way to remove these antibiotics from water supplies,knowledge of their mechanisms is limited.There are four main factors affecting the performance of CWs used for the treatment of antibiotics in water supplies,the types and configurations of CWs,hydraulic load rates,substrates,and plants and microorganisms.Further researches focusing on these factors are needed to improve the removal efficiency of antibiotics in CWs.GUAN Yidong WANG Bo GAO Yongxia LIU Wen ZHAO Xiaoli HUANG Xiaofeng YU Jianghuai 2017Pedosphere2017,27,1:22
2A Model to Predict Stall Inception of Transonic Axial Flow Fan/Compressors显示文摘A stall inception model for transonic fan/compressors is presented in this paper. It can be shown that under some assumptions the solution of unsteady flow field consists of pressure wave which propagates upstream or downstream, vortex wave and entropy wave convected with the mean flow speed. By further using the mode-matching technique and applying the conservation law and conditions reflecting the loss characteristics of a compressor in the inlet and outlet of the rotor or stator blade rows, a group of homogeneous equations can be obtained from which the stability equation can be derived. Based on the analysis of the unsteady phenomenon caused by casing treatments, the function of casing treatments has been modeled by a wall impedance condition which has been included in the stability model through the eigenvalues and the corresponding eigenfunctions of the system. Besides, the effect of shock waves in cascade channel on the stability prediction is also considered in the stall inception model. Finally, some numerical analysis and experimental investigation are also conducted with emphasis on the mutual comparison.SUN Xiaofeng SUN Dakun YU Weiwei 2011Chinese Journal of Aeronautics2011,24,6:20
3Curative effect of heat-sensitive moxibustion on chronic persistent asthma: a multicenter randomized controlled trial显示文摘OBJECTIVE:To compare the curative effects of heat-sensitive moxibustion with conventional drugs on chronic persistent asthma and seek a valuable therapy to replaceWestern Medicine.METHODS:The participants in this multi-center,randomized,and controlled study were randomly divided into two groups:group A(n=144),treated with heat-sensitive moxibustion(50 sessions)and group B(n=144),treated with Seretide(salmeterol50μg/fluticasone 250μg,twice a day).The scores of asthma control test(ACT),forced expiratory volume in 1 second(FEV1),peak expiratory flow(PEF),and attack frequency were measured after 15,30,60,and 90 days of treatment.Patients followed up3 and 6 months after treatment.RESULTS:There was a significant difference(P=0.0002)in the ACT score and lung function between the two groups after 3 months of treatment and(P=0.000 03)during the follow-up visits.In addition,heat-sensitive moxibustion reduced attack frequency in the period from inclusion to the6-month follow-up visit.CONCLUSION:This study shows that heat-sensitive moxibustion may have a comparable curative effect toSeretide(salmeterol/fluticasone)on asthma.Rixin Chen Mingren Chen Jun Xiong Zhenhai Chi B0 Zhang Ning Tian Zhenhua Xu Tangfa Zhang Wanyao Li Wei Zhang Xiaofeng Rong Zhen Wang Gang Sun Baohe Ge Guoxiong Yu Nanchang Song 2013Journal of Traditional Chinese Medicine2013,33,5:20
45-Methylcytosine RNA Methylation in Arabidopsis Thaliana显示文摘5-Methylcytosine (m 5 C ) 是描绘得好的 DNA 修正,并且主要也在初核质和优核质在丰富的非编码的 RNA 被报导。然而,分发和 m 5 在植物 mRNAs 的 C 仍然保持大部分未知。这里,我们报导 RNA m 5 在由使用 m 5 C RNA immunoprecipitation 由一条深定序的途径列在后面(m 5 C-RIP-seq ) 。LC-MS/MS 和点污点分析揭示 m 5 在各种各样的纸巾并且在不同发展阶段的 C mRNA 修正。m 5 C-RIP-seq 分析识别了 6045 m 5 在 4465 的 C 山峰在年轻幼苗表示了基因。我们发现那 m 5 C 在编码序列,二座山峰在开始 codons 以后并且在站 codons 前立即定位了被充实,并且随低翻译与 mRNAs 被联系活动。我们进一步表明了那 RNA (cytosine-5 )-methyltransferase,tRNA 特定的 methyltransferase 4B (TRM4B ) ,展览 m 5 C RNA methyltransferase 活动。在 TRM4B 的变化在根开发和减少的 m 5 C 山峰。TRM4B 影响涉及根开发的基因的抄本层次,它断然与他们的 mRNA 稳定性和 m 5 C 层次。我们的结果建议那 m 5 在 mRNA 的 C 是新 epitranscriptome 标记 inArabidopsis,并且这修正的那条规定是基因的不可分的部分规章的网络位于 \O 下面植物开发。Xuean Cui Zhe Liang Lisha Shen Qian Zhang Shengjie Bao Yuke Geng Bin Zhang Vonny Leo Leah A. Vardy Tiegang Lu Xiaofeng Gu Hao Yu 2017Molecular Plant2017,10,11:19
5N6-Methyladenine DNA Methylation in Japonica and Indica Rice Genomes and Its Association with Gene Expression,Plant Development, and Stress Responses显示文摘N6-Methyladenine (6mA)DNA methylation has recently been implicated as a potential new epigenetic marker in eukaryotes,including the dioot modelArabidopsis thaliana.However,the conservation and divergence of 6mA distribution patterns and functions in plants remain elusive.Here we report high-quality 6mA methylomes at single-nucleotide resolution in rice based on substantially improved genome sequences of two rice cultivars,Nipponbare (Nip;Japonica)and 93-11 (Indica).Analysis of 6mA genomic distribution and its association with transcription suggest that 6mA distribution and function is rather conserved between rice and Arabidopsis.We found that 6mA levels are positively correlated with the expression of key stressrelated genes,which may be responsible for the difference in stress tolerance between Nip and 93-11. Moreover,we showed that mutations in DDM1 cause defects in plant growth and decreased 6mA level. Our results reveal that 6mA is a conserved DNA modification that is positively associated with gene expression and contributes to key agronomic traits in plants.Qian Zhang Zhe Liang Xuean Cui Changmian Ji Yun Li Pingxian Zhang Jingrong Liu Adeel Riaz Pu Yao Min Liu Yunpeng Wang Tiegang Lu Hao Yu Donglei Yang Hongkun Zheng Xiaofeng Gu 2018Molecular Plant2018,11,12:18
6Integrating TM and Ancillary Geographical Data with Classification Trees for Land Cover Classification of Marsh Area显示文摘The main objective of this research is to determine the capacity of land cover classification combining spec- tral and textural features of Landsat TM imagery with ancillary geographical data in wetlands of the Sanjiang Plain, Heilongjiang Province, China. Semi-variograms and Z-test value were calculated to assess the separability of grey-level co-occurrence texture measures to maximize the difference between land cover types. The degree of spatial autocorrelation showed that window sizes of 3×3 pixels and 11×11 pixels were most appropriate for Landsat TM im- age texture calculations. The texture analysis showed that co-occurrence entropy, dissimilarity, and variance texture measures, derived from the Landsat TM spectrum bands and vegetation indices provided the most significant statistical differentiation between land cover types. Subsequently, a Classification and Regression Tree (CART) algorithm was applied to three different combinations of predictors: 1) TM imagery alone (TM-only); 2) TM imagery plus image texture (TM+TXT model); and 3) all predictors including TM imagery, image texture and additional ancillary GIS in- formation (TM+TXT+GIS model). Compared with traditional Maximum Likelihood Classification (MLC) supervised classification, three classification trees predictive models reduced the overall error rate significantly. Image texture measures and ancillary geographical variables depressed the speckle noise effectively and reduced classification error rate of marsh obviously. For classification trees model making use of all available predictors, omission error rate was 12.90% and commission error rate was 10.99% for marsh. The developed method is portable, relatively easy to im- plement and should be applicable in other settings and over larger extents.NA Xiaodong ZHANG Shuqing ZHANG Huaiqing LI Xiaofeng YU Huan LIU Chunyue 2009Chinese Geographical Science2009,19,2:14
7Real-world fuel efficiency and exhaust emissions of light-duty diesel vehicles and their correlation with road conditions显示文摘The real-world fuel efficiency and exhaust emission profiles of CO, HC and NOx for light-duty diesel vehicles were investigated. Using a portable emissions measurement system, 16 diesel taxies were tested on different roads in Macao and the data were normalized with the vehicle specific power bin method. The 11 Toyota Corolla diesel taxies have very good fuel economy of (5.9 ± 0.6) L/100 km, while other five diesel taxies showed relatively high values at (8.5 ± 1.7) L/100 km due to the variation in transmission systems and emission control strategies. Compared to similar Corolla gasoline models, the diesel cars confirmed an advantage of ca. 20% higher fuel efficiency. HC and CO emissions of all the 16 taxies are quite low, with the average at (0.05 ± 0.02) g/km and (0.38 ± 0.15) g/km, respectively. The average NOx emission factor of the 11 Corolla taxies is (0.56 ± 0.17) g/km, about three times higher than their gasoline counterparts. Two of the three Hyundai Sonata taxies, configured with exhaust gas recirculation (EGR) + diesel oxidation catalyst (DOC) emission control strategies, indicated significantly higher NO2 emissions and NO2/NOx ratios than other diesel taxies and consequently trigger a concern of possibly adverse impacts on ozone pollution in urban areas with this technology combination. A clear and similar pattern for fuel consumption and for each of the three gaseous pollutant emissions with various road conditions was identified. To save energy and mitigate CO2 emissions as well as other gaseous pollutant emissions in urban area, traffic planning also needs improvement.Jingnan Hu Ye Wu Zhishi Wang Zhenhua Li Yu Zhou Haitao Wang Xiaofeng Bao Jiming Hao 2012Journal of Environmental Sciences2012,24,5:14
8Spatial distribution and focal mechanism solutions of the Wenchuan earthquake series:Results and implications显示文摘We relocate the spatial distribution of the devastating 12 May 2008 Wenchuan earthquake and its aftershocks.The relocation database is obtained from 89 stations deployed by the China Earthquake Administration,including 54 525 seismograms from 1 376 local earthquakes over MS3.5 between 12 May 2008 and 3 August 2008.The cross-correlation technique used in this paper has greatly improved the relocation precision by giving much more accurate P-wave differential travel-time measurements than those obtained from routinely picked phase onsets.At the same time,we pick P-wave polarity observations of the Wenchuan earthquake series (hereafter referred to as WES) from 1 023 stations in China and 59 IRIS (Incorporated Research Institutions of Seismology) stations.Then,employing a newly developed program CHNYTX,we obtain 83 well-determined focal mechanism solutions (hereafter referred to as FMSs).Based on spatial distribution and FMSs of the WES,we draw following conclusions:(1) The region near the main shock exhibits a buried low-angle northwest-dipping seismic zone with the main shock at its upper end and two conjugated seismic zones dipping southeast with roughly equal dip-angle;(2) The compressional directions of all kinds of FMSs of the WES are subhorizontal,which reflects the dominant stress in this area is compressional;(3) The principal compressional direction of the regional stress around Wenchuan is roughly perpendicular to the strike of Beichuan-Yingxiu fault,while around Qingchuan it is roughly parallel to the strike of Qingchuan fault.In intermediate part of the Longmenshan area,the principal compressional direction of the stress should be in-between;(4) The possibly existed molten materials in the lower crust of Songpan-Garze terrain have small contribution to the local stress state in Longmenshan area.The listric geometries of the Longmenshan faults most probably resulted from subhorizontal compression along NW-SE direction in history.Chen Cai Chunquan Yu Kai Tao Xingping Hu Yuan Tian Hao Zhang Xiaofeng Cui Jieyuan Ning 2011Earthquake Science2011,24,1:13
9Understanding primary and secondary sources of ambient oxygenated volatile organic compounds in Shenzhen utilizing photochemical age-based parameterization method显示文摘Oxygenated volatile organic compounds(OVOCs) are key intermediates in the atmospheric photooxidation process. To further study the primary and secondary sources of OVOCs,their ambient levels were monitored using a proton-transfer reaction mass spectrometer(PTR-MS) at an urban site in the Pearl River Delta of China. Continuous monitoring campaigns were conducted in the spring, summer, fall, and winter of 2016. Among the six types of OVOC species, the mean concentrations of methanol were the highest in each season(up to 13–20 ppbv), followed by those of acetone, acetaldehyde and acetic acid(approximately 2–4 ppbv), while those of formic acid and methyl ethyl ketone(MEK) were the lowest(approximately 1–2 ppbv). As observed from a diurnal variation chart, the OVOCs observed in Shenzhen may have been affected by numerous factors such as their primary and secondary sources and photochemical consumption. The photochemical age-based parameterization method was used to apportion the sources of ambient OVOCs. Methanol had significant anthropogenic primary sources but negligible anthropogenic secondary sources during all of the seasons. Acetone, MEK and acetic acid were mostly attributed to anthropogenic primary sources during each season with smaller contributions from anthropogenic secondary sources. Acetaldehyde had similar contributions from both anthropogenic secondary and anthropogenic primary sources throughout the year.Meanwhile, anthropogenic primary sources contributed the most to formic acid.Bo Zhu Yu Han Chuan Wang Xiaofeng Huang Shiyong Xia Yingbo Niu Zixuan Yin Lingyan He 2019Journal of Environmental Sciences2019,31,1:13
10Preparation of ChlL-2 and IBDV VP2 Fusion Protein by Baculovirus Expression System显示文摘This study aims to produce an effective subunit vaccine against infectious bursal disease virus (IBDV). The genes of chicken interleukin-2 (ChIL-2) and IBDV viral protein 2 (VP2) were amplified and fused by splice overlap extension-polymerase chain reaction (SOE-PCR). The fusion gene was digested by EcoR I/Kpn I and inserted into pBacPAK8 vector, resulting in recombinant transfer plasmid pBacPakVP2-IL2. The recombinant plasmid was transfected into Sf-9 cells accompanied with hybrid nuclear polyhedrosis virus (HyNPV) genome DNA and lipofectin. Plaque-purification indicated that we had got the recombinant Hy-VP2-IL2. Fusion protein VP2-IL2was expressed effectively both in insect cells and bombyx mori. The expression of fusion protein was confirmed by ELISA, SDS-PAGE and Western blotting assay, respectively. This efficient system allows us to meet the need for inexpensive vaccines required by the poultry industry.Yan Liu Yongwei Wei Xiaofeng Wu Lian Yu 2005Cellular & Molecular Immunology2005,2,3:12
11Characterizing oxygenated volatile organic compounds and their sources in rural atmospheres in China显示文摘Oxygenated volatile organic compounds(OVOCs) are important precursors and products of atmospheric secondary pollution. The sources of OVOCs, however, are still quite uncertain,especially in the atmosphere with much pollution in China. To study the sources of OVOCs in rural atmospheres, a proton transfer reaction mass spectrometry(PTR-MS) was deployed at a northern rural site(WD) and a southern rural site(YMK) in China during the summer of 2014 and 2016, respectively. The continuous observation showed that the mean concentration of TVOCs(totally 17 VOCs) measured at WD(52.4 ppbv) was far higher than that at YMK(11.1 ppbv), and the OVOCs were the most abundant at both the two sites. The diurnal variations showed that local sources of OVOCs were still prominent at WD, while regional transport influenced YMK much. The photochemical age-based parameterization method was then used to quantitatively apportion the sources of ambient OVOCs. The anthropogenic primary sources at WD and YMK contributed less(2%–16%) to each OVOC species. At both the sites, the atmospheric background had a dominant contribution(~ 50%) to acetone and formic acid, while the anthropogenic secondary formation was the main source(~ 40%) of methanol and MEK. For acetaldehyde and acetic acid, the biogenic sources were their largest source(~ 40%) at WD, while the background(39%) and anthropogenic secondary formation(42%) were their largest sources at YMK, respectively. This study reveals the complexity of sources of OVOCs in China, which urgently needs explored further.Yu Han Xiaofeng Huang Chuan Wang Bo Zhu Lingyan He 2019Journal of Environmental Sciences2019,31,7:12
12Arabidopsis co-chaperonin CPN20 antagonizes Mg-chelatase H subunit to derepress ABA-responsive WRKY40 transcription repressor显示文摘Our previous study demonstrated that a chloroplast co-chaperonin 20(CPN20),one of the interaction partners of the magnesium-protoporphyrin IX chelatase H subunit(CHLH/ABAR),negatively regulates ABA signaling at the same node with ABAR but upstream of WRKY40 transcription repressor in Arabidopsis thaliana.In the present experiment,we showed that ABA directly inhibits the ABAR-CPN20 interaction,and also represses expression of CPN20,which depends on ABAR.CPN20 inhibits ABAR-WRKY40 interaction by competitively binding to ABAR.ABAR downregulates,but CPN20 upregulates,WRKY40 expression.The cpn20-1 mutation induces downregulation of WRKY40,and suppresses the upregulated level of WRKY40 due to the cch mutation in the ABAR gene.ABA-induced repressive effect of the WRKY40 gene is strengthened by downregulation of CPN20 but reduced by upregulation of CPN20.Together with our previously reported genetic data,we provide evidence that CPN20 functions through antagonizing the ABAR-WRKY40 coupled pathway,and ABA relieves this pathway of repression by inhibiting the ABAR-CPN20 interaction to activate ABAR-WRKY40 interaction.ZHANG XiaoFeng JIANG Tao YU YongTao WU Zhen JIANG ShangChuan LU Kai FENG XiuJing LIANG Shan LU YanFen WANG XiaoFang ZHANG DaPeng 2014Science China(Life Sciences)2014,57,1:11
13Transcriptional Regulation of miR528 by OsSPL9 Orchestrates Antiviral Response in Rice显示文摘Many microRNAs (miRNAs) are critical regulators of plant antiviral defense.However,little is known about how these miRNAs respond to virus invasion at the transcriptional level.We previously show that defense against Rice stripe virus (RSV) invasion entailed a reduction of miR528 accumulation in rice,alleviating miR528-mediated degradation of L-Ascorbate Oxidase (AO) mRNA and bolstering the antiviral activity of AO.Here we show that the miR528-A0 defense module is regulated by the transcription factor SPL9.SPL9 displayed high-affinity binding to specific motifs within the promoter region of miR528 and activated the expression of miR528 gene in vivo.Loss-of-function mutations in SPL9 caused a significant reduction in miR528 accumulation but a substantial increase of AO mRNA,resulting in enhanced plant resistance to RSV.Conversely,transgenic overexpression of SPL9 stimulated the expression of miR528 gene,hence lowering the level of AO mRNA and compromising rice defense against RSV.Importantly,gain in RSV susceptibility did not occur when SPL9 was overexpressed in mir528 loss-of-function mutants,or in transgenic rice expressing a miR528-resistant AO.Taken together,the finding of SPL9-mediated transcriptional activation of miR528 expression adds a new regulatory layer to the miR528-A0 antiviral defense pathway.Shengze Yao Zhirui Yang Rongxin Yang Yu Huang Ge Guo Xiangyue Kong Ying Lan Tong Zhou He Wang Wenming Wang Xiaofeng Cao Jianguo Wu Yi Li 2019Molecular Plant2019,12,8:10
14Vertically aligned reduced graphene oxide/Ti_(3)C_(2)T_(x)MXene hybrid hydrogel for highly efficient solar steam generation显示文摘Effective utilization of abundant solar energy for desalination of seawater and purification of wastewater is one of sustainable techniques for production of clean water,helping relieve global water resource shortage.Herein,we fabricate a vertically aligned reduced graphene oxide/Ti_(3)C_(2)T_(x)MXene(A-RGO/MX)hybrid hydrogel with aligned channels as an independent solar steam generation device for highly efficient solar steam generation.The vertically aligned channels,generated by a liquid nitrogen-assisted directional-freezing process,not only rapidly transport water upward to the evaporation surface for efficient solar steam generation,but also facilitate multiple reflections of solar light inside the channels for efficient solar light absorption.The deliberate slight reduction endows the RGO with plenty of polar groups,decreasing the water vaporization enthalpy effectively and hence accelerating water evaporation efficiently.The MXene sheets,infiltrated inside the A-RGO hydrogel on the basis of Marangoni effect,enhance light absorption capacity and photothermal conversion performance.As a result,the A-RGO/MX hybrid hydrogel achieves a water evaporation rate of 2.09 kg·m^(−2)·h^(−1)with a high conversion efficiency of 93.5%under 1-sun irradiation.Additionally,this photothermal conversion hydrogel rapidly desalinates seawater and purifies wastewater to generate clean water with outstanding ion rejection rates of above 99%for most ions.Wei Li Xiaofeng Li Wei Chang Jing Wu Pengfei Liu Jianjun Wang Xi Yao Zhong-Zhen Yu 2020Nano Research2020,13,11:10
15Allele-aware chromosome-level genome assembly of Artemisia annua reveals the correlation between ADS expansion and artemisinin yield显示文摘Artemisia annua is the major natural source of artemisinin,an anti-malarial medicine commonly used worldwide.Here,we present chromosome-level haploid maps for two A.annua strains with different artemisinin contents to explore the relationships between genomic organization and artemisinin production.High-fidelity sequencing,optical mapping,and chromatin conformation capture sequencing were used to assemble the heterogeneous and repetitive genome and resolve the haplotypes of A.annua.Approximately 5o,ooo genes were annotated for each haplotype genome,and a triplication event that occurred approximately 58.12million years ago was examined for the first time in this species.A total of 3,903,467-5,193,414 variants(SNPs,indels,and structural variants)were identified in the 1.5-Gb genome during pairwise comparison between haplotypes,consistent with the high heterozygosity of this species.Genomic analyses revealed a correlation between artemisinin concents and the copy number of amorpha-4,11-dienes ynthasegenes.This correlation was further confirmed by resequencing of 36A.annua samples with varied artemisinin contents.Circular consensus sequencing of transcripts facilitated the detection of paralog expression.Collectively,our study provides chromosome-level allele-aware genome assemblies for two A.annua strains and new insights into the biosynthesis of artemisinin and its regulation,which will contribute to conquering malaria worldwide.Baosheng Liao Xiaofeng Shen Li Xiang Shuai Guo Shiyu Chen Ying Meng Yu Liang Dandan Ding Junqi Bai Dong Zhang Tomasz Czechowski Yi Li Hui Yao Tingyu Mai Caroline Howard Chao Sun Haitao Liu Jiushi Liu Jin Pei Jihai Gao Jigang Wang Xiaohui Qiu Zhihai Huang Hongyi Li Ling Yuan Jianhe Wei lan Graham Jiang Xu Boli Zhang Shilin Chen 2022Molecular Plant2022,15,8:9
16Phylogenetic and genetic characterization of a 2017 clinical isolate of H7N9 virus in Guangzhou,China during the fifth epidemic wave显示文摘Pathogenic H7N9 influenza viruses continue to pose a public health concern. The H7N9 virus has caused five outbreak waves of human infections in China since 2013. In the present study, a novel H7N9 strain(A/Guangdong/8 H324/2017) was isolated from a female patient with severe respiratory illness during the fifth wave of the 2017 H7N9 epidemic. Phylogenetic analysis showed that the H7N9 viruses collected during the fifth wave belong to two different lineages: the Pearl River Delta lineage and the Yangtze River Delta lineage. The novel isolate is closely related to the Pearl River Delta H7N9 viruses, which were isolated from patients in Guangdong Province. The novel H7N9 isolate has an insertion of three basic amino acids in the cleavage site of hemagglutinin(HA), which may enhance virulence in poultry. The 2017 isolate also possesses an R292 K substitution in the neuraminidase(NA)protein, which confers oseltamivir resistance. This study highlights the pandemic potential of the novel H7N9 virus in mammals;thus, future characterization and surveillance is warranted.Yongqiang Deng Chunlin Li Jianfeng Han Yingfen Wen Jian Wang Wenxing Hong Xiaofeng Li Zhongyu Liu Qing Ye Jing Li Changshuai Zhou Lei Yu Chengfeng Qin Fuchun Zhang Tao Jiang 2017Science China(Life Sciences)2017,60,12:9
17A LysM Receptor Heteromer Mediates Perception of Arbuscular Mycorrhizal Symbiotic Signal in Rice显示文摘Symbiotic microorganisms improve nutrient uptake by plants.To initiate mutualistic symbiosis with arbus-cular mycorrhizal(AM)fungi,plants perceive Myc factors,including lipochitooligosaccharides(LCOs)and short-chain chitooligosaccharides(CO4/CO5),secreted by AM fungi.However,the molecular mechanism of Myc factor perception remains elusive.In this study,we identified a heteromer of LysM receptor-like kinases consisting of OsMYR1/OsLYK2 and OsCERK1 that mediates the perception of AM fungi in rice.CO4 directly binds to OsMYR1,promoting the dimerization and phosphorylation of this receptor complex.Compared with control plants,Osmyr1 and Oscerk1 mutant rice plants are less sensitive to Myc factors and show decreased AM colonization.We engineered transgenic rice by expressing chimeric receptors that respectively replaced the ectodomains of OsMYR1 and OsCERK1 with those from the homologous Nod factor receptors MtNFP and MtL YK3 of Medicago truncatula.Transgenic plants displayed increased cal-cium oscillations in response to Nod factors compared with control rice.Our study provides significant mechanistic insights into AM symbiotic signal perception in rice.Expression of chimeric Nod/Myc recep-tors achieves a potentially important step toward generating cereals that host nitrogen-fixing bacteria.Jiangman He Chi Zhang Huiling Dai Huan Liu Xiaowei Zhang Jun Yang Xi Chen Yayun Zhu Dapeng Wang Xiaofeng Qi Weichao Li Zhihui Wang Guoyong An Nan YU Zuhua He Yong-Fei Wang Youli Xiao Peng Zhang Ertao Wang 2019Molecular Plant2019,12,12:9
18Rapid removal of bisphenol A on highly ordered mesoporous carbon显示文摘Bisphenol A (BPA) is of global concern due to its disruption of endocrine systems and ubiquity in the aquatic environment.It is important,therefore,that efforts are made to remove it from the aqueous phase.A novel adsorbent,mesoporous carbon CMK-3,prepared from hexagonal SBA-15 mesoporous silica was studied for BPA removal from aqueous phase,and compared with conventional powdered activated carbon (PAC).Characterization of CMK-3 by transmission electron microscopy (TEM),X-ray diffraction,and nitrogen adsorption indicated that prepared CMK-3 had an ordered mesoporous structure with a high specific surface area of 920 m 2 /g and a pore-size of about 4.9 nm.The adsorption of BPA on CMK-3 followed a pseudo second-order kinetic model.The kinetic constant was 0.00049 g/(mg·min),much higher than the adsorption of BPA on PAC.The adsorption isotherm fitted slightly better with the Freundlich model than the Langmuir model,and adsorption capacity decreased as temperature increased from 10 to 40°C.No significant influence of pH on adsorption was observed at pH 3 to 9;however,adsorption capacity decreased dramatically from pH 9 to 13.Qian Sui Jun Huang Yousong Liu Xiaofeng Chang Guangbin Ji Shubo Deng Tao Xie Gang Yu 2011Journal of Environmental Sciences2011,23,2:8
19Control Method for Steel Strip Roughness in Two-stand Temper Mill Rolling显示文摘How to control surface roughness of steel strip in a narrow range for a long time has become an important question because surface roughness would significantly influence the appearance of the products. However, there are few effective solutions to solve the problem currently. In this paper, considering both asperities of work roll pressing in and squeezing the steel strip, two asperity contact models including squeezing model and pressing in model in a two-stand temper mill rolling are established by using finite element method(FEM). The simulation investigates the influences of multiple process parameters, such as work roll surface roughness, roll radius and roll force on the surface roughness of steel strip. The simulation results indicate that work rolls surface roughness and roll force play important roles in the products; furthermore, the effect of roll force in the first stand is opposite to the second. According to the analysis, a control method for steel strip surface roughness in a narrow range for a long time is proposed, which applies higher work roll roughness in the first stand and lower roll roughness in the second to make the steel strip roughness in a required narrow range. In the later stage of the production, decreasing the roll force in the first stand and increasing the roll force in the second stand guarantee the steel strip roughness relatively stable in a long time. The following experimental measurements on the surface topography and roughness of the steel strips during the whole process are also conducted. The results validate the simulation conclusions and prove the effect of the control method. The application of the proposed method in the steel strip production shows excellent performance including long service life of work roll and high finished product rate.LI Rui ZHANG Qingdong ZHANG Xiaofeng YU Meng WANG Bo 2015Chinese Journal of Mechanical Engineering2015,28,3:8
20IGF-1 alleviates ox-LDL-induced inflammation via reducing HMGB1 release in HAECs显示文摘动脉粥样硬化, multifactorial 长期的煽动性的反应,仔细与氧化地修改的低密度的脂蛋白(ox-LDL ) 被联系。(HMGB1 ) 高活动性的组盒子 1 是 DNA 有约束力的蛋白质,它在从房间的版本之上展出有势力煽动性的行动。(IGF-1 ) 像胰岛素的生长因素 1 能包括增长和 anti-apoptosis 得到细胞的回答的一个全部剧目。然而,在发炎的 IGF-1 的角色仍然是不清楚的。在现在的学习,我们试图在发炎和内在的机制调查 IGF-1 的角色。人的大动脉的 endothelial 房间被 ox-LDL (50 g/ml ) 刺激导致发炎。细胞间的粘附分子 1 的表示(ICAM-1 ) 被西方的污点分析和 immunofluorescence 估计。HMGB1 的版本被连接酶的 immunosorbent 试金决定。IGF-1 受体(IGF-1R ) 表示被反向的抄写聚合酶链反应和西方的污点分析估计。IGF-1R phosphorylation 被西方的污点分析决定。Ox-LDL 刺激减少了 IGF-1R mRNA 和蛋白质表示,但是增加了 HMGB1 版本。IGF-1 处理减少了 ox-LDL-induced ICAM-1 表示,潜在地通过减少 HMGB1 释放 picropodophyllin,一个 IGF-1R 特定的禁止者,增加了煽动性的反应。在结论, IGF-1 能由减少 HMGB1 版本减轻 ox-LDL-induced 发炎,建议在煽动性的疾病的 IGF-1 的一个意外有益的角色。Xiaofeng Yu Chunyan Xing Yinghua Pan Housheng Ma Jie Zhang Wenjun Li 2012Acta Biochimica et Biophysica Sinica2012,44,9:8
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