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Silicon impacts on soil microflora under Ralstonia Solanacearum inoculation

Journal of Integrative Agriculture 2020年第1期19卷 251-264页

作者： lin wei-peng JIANG Ni-hao peng Li FAN Xue-ying GAO Yang WANG Guo-ping CAI Kun-zheng College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642P.R.China Tea Research Institute Guangdong Academy of Agricultural SciencesGuangzhou 510640P.R.China Key Laboratory of Tropical Agricultural Environment in South China Ministry of AgricultureGuangzhou 510642P.R.China College of Agriculture South China Agricultural UniversityGuangzhou 510642P.R.China College of Horticulture South China Agricultural UniversityGuangzhou 510642P.R.China

Silicon(Si) can increase plant resistance against bacterial wilt caused by Ralstonia solanacearum and enhance plant immune response. However, whether Si alleviates soil-borne disease stress through altering soil microbial community component and diversity is not clear. In this study, effects of Si application under R. solanacearum inoculation with or without plant on soil bacterial and fungal communities were investigated through high-throughput pyrosequencing technique. The results showed that Si addition significantly reduced bacterial wilt incidence. However, Si did not reduce the amount of R. solanacearum in rhizosphere soil. Principal components analysis showed that soil microbial community composition was strongly influenced by Si addition. Total 63.7% bacterial operational taxonomic units(OTUs) and 43.8% fungal OTUs were regulated by Si addition regardless of the presence of tomato plants, indicating the independent effects of Si on soil microbial community. Si-added soil harbored a lower abundance of Fusarium, Pseudomonas, and Faecalibacterium. Our finding further demonstrated that exogenous Si could significantly influence soil microbial community component, and this may provide additional insight into the mechanism of Si-enhanced plant resistance against soil-borne pathogens.

关键词： bacterial wilt deep pyrosequencing Ralstonia solanacearum silicon soil microbial community

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Impacts of chemical fertilizer reduction and organic amendments supplementation on soil nutrient,enzyme activity and heavy metal content

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Journal of Integrative Agriculture 2017年第8期16卷 1819-1831页

作者： NING Chuan-chuan GAO peng-dong WANG Bing-qing lin wei-peng JIANG Ni-hao CAI Kun-zheng Key Laboratory of Tropical Agro-environment Ministry of Agriculture/South China Agricultural UniversityGuangzhou 510642P.R.China

Excessive use of agro-chemicals （such as mineral fertilizers） poses potential risks to soil quality. Application of organic amendments and reduction of inorganic fertilizer are economically feasible and environmentally sound approaches to de- velop sustainable agriculture. This study investigated and evaluated the effects of mineral fertilizer reduction and partial substitution of organic amendment on soil fertility and heavy metal content in a 10-season continually planted vegetable field during 2009-2012. The experiment included four treatments： 100% chemical fertilizer （CF100）, 80% chemical fertilizer （CF80）, 60% chemical fertilizer and 20% organic fertilizer （CF60＋OM20）, and 40% chemical fertilizer and 40% organic fertilizer （CF40＋OM40）. Soil nutrients, enzyme activity and heavy metal content were determined. The results showed that single chemical fertilizer reduction （CF80） had no significant effect on soil organic matter content, soil catalase activity and soil heavy metal content, but slightly reduced soil available N, P, K, and soil urease activity, and significantly reduced soil acid phosphatase activity. Compared with CF100, 40 or 60% reduction of chemical fertilizer supplemented with organic fertilizer （CF60＋OM20, CF40＋OM40） significantly increased soil organic matter, soil catalase activity and urease activity especially in last several seasons, but reduced soil available P, K, and soil acid phosphatase activity. In addition, continu- ous application of organic fertilizer resulted in higher accumulation of Zn, Cd, and Cr in soil in the late stage of experiment, which may induce adverse effects on soil health and food safety.

关键词： chemical fertilizer organic amendments soil fertility vegetable soil health heavy metal

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Physiological response and phenolic metabolism in tomato (Solanum lycopersicum) mediated by silicon under Ralstonia solanacearum infection

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Journal of Integrative Agriculture 2018年第10期17卷 2160-2171页

作者： FAN Xue-ying lin wei-peng LIU Rui JIANG Ni-hao CAI Kun-zheng College of Natural Resources and Environment/Key Laboratory of Tropical Agro-environment Ministry of Agriculture South China Agricultural University Laboratory of Ecotoxicity and Environmental Safety Guangdong Detection Center of Microbiology Guangdong Institute of Microbiology Tea Research Institute Guangdong Academy of Agricultural Sciences

Bacterial wilt, caused by Ralstonia solanacearum（Rs） is a serious soil-borne disease and silicon can enhance tomato resistance against this disease. However, few studies have focused on the mechanisms of Si-mediated pathogen resistance from the rhizosphere perspective. In this study, two tomato genotypes, HYT（susceptible） and H7996（resistant）, were used to investigate the effects of silicon application on disease inhibition, root growth, and organic acid content in both roots and root exudates under R. solanacearum infection. The results showed that Si application significantly suppressed bacterial wilt in HYT, but had no effect in H7996. Silicon concentrations in roots, stems and leaves of tomato were significantly increased by Si treatment under R. solanacearum inoculation. In HYT, Si application increased root dry weight by 22.8-51.6% and leaf photosynthesis by 30.6-208.0%, and reduced the concentrations of citric acid in root exudates by 71.4% and in roots by 83.5%. However, organic acids did not influence R. solanacearum growth. Results also demonstrated that salicylic acid（SA） content in roots was significantly increased by silicon addition for H7996 and exogenous SA application could reduce bacterial wilt disease index. Collectively, these results suggest that Si-modulated phenolic compound metabolism in roots or root exudates, especially citric acid and SA, may be a potential mechanism in the amelioration of bacterial wilt disease by Si.

关键词： silicon root root exudates Solanum lycopersicum Ralstonia solanacearum organic acids

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Hounsfield units in assessing bone mineral density in ankylosing spondylitis patients with cervical fracture-dislocation

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World Journal of Clinical Cases 2024年第23期12卷 5329-5337页

作者： Zhong-Ya Gao wei-lin peng Yang Li Xu-Hua Lu Department of Orthopaedics Shanghai Changzheng HospitalNaval Medical UniversityShanghai 200003China

BACKGROUND Cervical spine fracture-dislocations in patients with ankylosing spondylitis(AS)are mostly unstable and require ***,osteoporosis,one of the comorbidities for AS,could lead to detrimental *** are few accurate assessments of bone mineral density in AS *** To analyze Hounsfield units(HUs)for assessing bone mineral density in AS patients with cervical *** The HUs from C2 to C7 of 51 patients obtained from computed tomography(CT)scans and three-dimensional reconstruction of the cervical spine were independently assessed by two trained spinal surgeons and statistically ***-reader reliability and agreement were assessed by interclass correlation *** The HUs decreased gradually from C2 to *** mean values of the left and right levels were significantly higher than those in the *** the 51 patients,25 patients(49.02%)may be diagnosed with osteoporosis,and 16 patients(31.37%)may be diagnosed with *** The HUs obtained by cervical spine CT are feasible for assessing bone mineral density with excellent agreement in AS patients with cervical fracture-dislocation.

关键词： Hounsfield unit Ankylosing spondylitis Fracture-dislocation Cervical spine Osteoporosis

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可变波片构造等效线性可转波片的研究

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光子学报 2009年第7期38卷 1780-1783页

作者：李伟文林伟鹏董小鹏厦门大学电子工程系福建厦门361005

利用四元数理论分析了可变延迟波片,并依此由可变延迟波片组合构造了等效可转线性半波片和四分之一波片.提出由可变延迟波片按可转波片控制算法设计偏振控制器,以避免可变延迟波片偏振控制器所需的复位重置过程.仿真结果显示,按此构想... 详细信息

利用四元数理论分析了可变延迟波片,并依此由可变延迟波片组合构造了等效可转线性半波片和四分之一波片.提出由可变延迟波片按可转波片控制算法设计偏振控制器,以避免可变延迟波片偏振控制器所需的复位重置过程.仿真结果显示,按此构想得到的四波片控制器,能把任意偏振态转换为固定线偏振输出,其光强波动小于1%,相移范围不超过2π,控制过程不需要附加复位操作,其相移变化平缓.

关键词：光纤通信可转波片可变延迟片偏振控制器四元数

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Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-Gui peng peng Wu Zong-lin Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

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基于相位调制和光纤双折射光学倍频法

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光子学报 2011年第1期40卷 45-49页

作者：李伟文刘勇林伟鹏董小鹏厦门大学电子工程系福建厦门361005

为实现毫米波信号的光学倍频法产生,利用相位调制器和光纤梳状滤波器,构建了光学倍频系统.其中光纤梳状滤波器由起偏器、双折射光纤和检偏器组成.理论分析表明,在该倍频系统中,通过对梳状滤波器双折射延迟量的选择,可有效地抑制非期望... 详细信息

为实现毫米波信号的光学倍频法产生,利用相位调制器和光纤梳状滤波器,构建了光学倍频系统.其中光纤梳状滤波器由起偏器、双折射光纤和检偏器组成.理论分析表明,在该倍频系统中,通过对梳状滤波器双折射延迟量的选择,可有效地抑制非期望的奇次(偶次)谐波成分;通过对调相指数的优化,可进一步提高期望谐波分量的比例.仿真结果说明,利用该系统可有效地产生60 GHz的毫米波信号,并实现2.5 Gbps基带信号的传输.理论分析和仿真验证也表明,基于相位调制的光学倍频系统属于谐波倍频,而非扫频倍频.

关键词：光学倍频法毫米波相位调制梳状滤波器双折射光纤

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宇宙大尺度结构数值模拟的研究进展

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天文学进展 2018年第2期36卷 136-172页

作者：唐林林伟鹏中国科学院上海天文台星系与宇宙学重点实验室上海200030 中国科学院大学北京100049 中山大学物理与天文学院广州510275

宇宙的结构是由初始密度扰动发展而成的。在引力和宇宙膨胀的作用下,初始密度扰动不断增长,经过线性和非线性阶段,逐渐演化为现今的宇宙结构。在一个给定的宇宙学模型下,可以用一系列动力学方程来描述宇宙中暗物质和重子物质的运动及演... 详细信息

宇宙的结构是由初始密度扰动发展而成的。在引力和宇宙膨胀的作用下,初始密度扰动不断增长,经过线性和非线性阶段,逐渐演化为现今的宇宙结构。在一个给定的宇宙学模型下,可以用一系列动力学方程来描述宇宙中暗物质和重子物质的运动及演化历史。在过去的几十年间,随着算法的完善和计算机技术的发展,从最初几十个粒子的纯引力模拟到1010个粒子在秒差距量级的多体加流体动力学模拟,大量不同的数值模拟技术被用来研究宇宙结构的形成和演化。在这个过程中,数值模拟的分辨率和精度不断提高,模型中对重子物质物理过程的描述也越来越完善。这些模拟技术与观测结果相结合,使人们对宇宙的大尺度结构以及星系团的形成和演化有了更深刻的理解,也在一定程度上影响了观测的发展方向和设备研发。不同数值模拟结果在纯引力研究方面得到了较好的统一,但不同的星系模型使得流体模拟的结果存在较大的差异。

关键词：宇宙大尺度结构星系形成和演化数值模拟多体动力学流体动力学

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Boosting bidirectional sulfur conversion enabled by introducing boron-doped atoms and phosphorus vacancies in Ni2P for lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第1期100卷 760-769页

作者： lin peng Yu Bai Hang Li Meixiu Qu Zhenhua Wang Kening Sun Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical Engineering Beijing Institute of Technology

Lithium-sulfur （Li-S） batteries have gained great attention due to the high theoretical energy density and low cost,yet their further commercialization has been obstructed by the notorious shuttle effect and sluggish redox ***,we supply a strategy to optimize the electron structure of Ni2P by concurrently introducing B-doped atoms and P vacancies in Ni2P （Vp-B-Ni2P）,thereby enhancing the bidirectional sulfur *** study indicates that the simultaneous introduction of B-doped atoms and P vacancies in Ni2P causes the redistribution of electron around Ni atoms,bringing about the upward shift of d-band center of Ni atoms and effective d-p orbital hybridization between Ni atoms and sulfur species,thus strengthening the chemical anchoring for lithium polysulfides （LiPSs） as well as expediting the bidirectional conversion kinetics of sulfur ***,theoretical calculations reveal that the incorporation of B-doped atoms and P vacancies in Ni2P selectively promotes Li2S dissolution and nucleation ***,the Li-S batteries with Vp-B-Ni2P-separators present outstanding rate ability of 777 m A h g-1at 5 C and high areal capacity of 8.03 mA h cm-2under E/S of 5μL mg-1and sulfur loading of 7.20 mg *** work elucidates that introducing heteroatom and vacancy in metal phosphide collaboratively regulates the electron structure to accelerate bidirectional sulfur conversion.

关键词： Lithium sulfur batteries

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星系际弥散恒星成分研究进展

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天文学进展 2011年第3期29卷 260-276页

作者：董旭策林伟鹏中国科学院上海天文台星系和宇宙学研究中心上海200030 中国科学院研究生院北京100039

对于星系际弥散恒星的研究是分别从观测、数值模拟和半解析模型这三个方面进行的。现在已经在邻近星系团及中低红移处观测到弥散恒星,甚至在Virgo及Coma星系团中观测到了单个的弥散恒星。观测数据的积累使得人们能够从统计上了解星系际... 详细信息

对于星系际弥散恒星的研究是分别从观测、数值模拟和半解析模型这三个方面进行的。现在已经在邻近星系团及中低红移处观测到弥散恒星,甚至在Virgo及Coma星系团中观测到了单个的弥散恒星。观测数据的积累使得人们能够从统计上了解星系际弥散恒星的性质。研究表明星系际弥散恒星围绕着星系团势阱中心呈椭球状对称分布,其在星系团恒星总质量中所占比例在10%～30%的范围内,和星系团总质量的关系不大,但是和星系团的富集程度有很大的相关,如在一个像Coma这样恒星富集度比较高的星系团中,这个比例能够达到40%甚至50%。数值模拟和半解析模型比较成功地预言了弥散恒星的起源和动力学性质,使得人们能够了解弥散恒星是在何时以何种方式形成,与星系团中最亮星系间的关系及其对星系形成模型的影响,从而对宇宙学研究中的恒星形成、星系中重子物质的分布等做出限制。

关键词：星系团弥散恒星星系形成与演化

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