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Understanding the mode of phytohormones' action in plants

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Science China(Life Sciences) 2011年第11期54卷 1062-1063页

作者： guo hongwei State Key Laboratory of Protein and Plant Gene Research College of Life Sciences Peking University Beijing 100871 China

Phytohormones are several small molecules that play essential roles throughout plant *** in 1880 Charles Darwin and his son Francis Darwin discovered that plant phototropism is regulated by a certain substance which is

关键词：植物激素动模弗朗西斯达尔文小分子向光性

From Endoplasmic Reticulum （ER） to Nucleus： EIN2 Bridges the Gap in Ethylene Signaling

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Molecular Plant 2013年第1期6卷 11-14页

作者： Yusi Ji hongwei guo State Key Laboratory of Protein and Plant Gene Research College of Life Sciences Peking University Beijing 100871 China Peking-Tsinghua Center for Life Sciences Beijing 100871China

The phytohormone ethylene plays essential roles in regu- lating plant growth and development. Understanding the mechanism of ethylene biosynthesis, signal transduction, and downstream responses is of great importance to frame the entire processes of plant growth. Genetic and biochemical approaches were applied in recent years to help establish an approximately linear ethylene signaling pathway.

关键词： PLANT growth PLANT hormones ETHYLENE AMINO acids POST-translational modification

To curve for survival:Apical hook development

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Journal of Integrative Plant Biology 2023年第2期65卷 324-342页

作者： Yichuan Wang Yang Peng hongwei guo Department of Biology School of Life SciencesKey Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education InstitutesInstitute of Plant and Food ScienceSouthern University of Science and Technology(SUSTech)Shenzhen 518055China

Apical hook is a simple curved structure formed at the upper part of hypocotyls when dicot seeds germinate in *** hook structure is transient but essential for seedlings’survival during soil emergence due to its efficient protection of the delicate shoot apex from mechanical *** a superb model system for studying plant differential growth,apical hook has fascinated botanists as early as the Darwin age,and significant advances have been achieved at both the morphological and molecular levels to understand how apical hook development is ***,we will mainly summarize the research progress at these two *** will also briefly compare the growth dynamics between apical hook and hypocotyl gravitropic bending at early seed germination phase,with the aim to deduce a certain consensus on their ***,we will outline the remaining questions and future research perspectives for apical hook development.

关键词： apical hook auxin gradient differential growth HOOKLESS1 phytohormones

Interplay of phytohormones and epigenetic regulation:A recipe for plant development and plasticity

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Journal of Integrative Plant Biology 2023年第2期65卷 381-398页

作者： Kai Jiang hongwei guo Jixian Zhai Institute of Plant and Food Science Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education InstitutesDepartment of BiologySchool of Life SciencesSouthern University of Science and Technology(SUSTech)Shenzhen 518055China

Both phytohormone signaling and epigenetic mechanisms have long been known to play crucial roles in plant development and plasticity in response to ambient ***,diverse signaling pathways mediated by phytohormones and epigenetic processes integrate multiple upstream signals to regulate various plant *** evidence indicates that phytohormones and epigenetic processes interact at multiple *** this review,we summarize the current knowledge of the interplay between phytohormones and epigenetic processes from the perspective of phytohormone *** also review chemical regulators used in epigenetic studies and propose strategies for developing novel regulators using multidisciplinary approaches.

关键词： chemical genetics epigenetics phytohormone plant growth and development plant growth regulator plasticity

A Deep Collocation Method for the Bending Analysis of Kirchhoff Plate

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Computers, Materials & Continua 2019年第5期59卷 433-456页

作者： hongwei guo Xiaoying Zhuang Timon Rabczuk Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Institute of Continuum Mechanics Leibniz Universität HannoverHannoverGermany Department of Geotechnical Engineering Tongji UniversityShanghaiChina Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghaiChina

In this paper,a deep collocation method(DCM)for thin plate bending problems is *** method takes advantage of computational graphs and backpropagation algorithms involved in deep ***,the proposed DCM is based on a feedforward deep neural network(DNN)and differs from most previous applications of deep learning for mechanical ***,batches of randomly distributed collocation points are initially generated inside the domain and along the boundaries.A loss function is built with the aim that the governing partial differential equations(PDEs)of Kirchhoff plate bending problems,and the boundary/initial conditions are minimised at those collocation points.A combination of optimizers is adopted in the backpropagation process to minimize the loss function so as to obtain the optimal *** Kirchhoff plate bending problems,the C^1 continuity requirement poses significant difficulties in traditional mesh-based *** can be solved by the proposed DCM,which uses a deep neural network to approximate the continuous transversal deflection,and is proved to be suitable to the bending analysis of Kirchhoff plate of various geometries.

关键词： Deep learning collocation method Kirchhoff plate higher-order PDEs

Effects of Joint on Dynamics of Space Deployable Structure

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 861-872页

作者： guo hongwei ZHANG Jing LIU Rongqiang DENG Zongquan School of Mechanical and Electrical Engineering Harbin Institute of Technology

Joints are necessary components in large space deployable truss structures which have significant effects on dynamic behavior of these joint dominated *** researches usually analyzed effects of one or fewer joint characters on dynamics of jointed *** of joint stiffness,damping,location,number,clearance and contact stiffness on dynamics of jointed structures are systematically *** beam model containing linear joints is developed based on finite element method,influence of joint on natural frequencies and mode shapes of the jointed system are *** results show that frequencies of jointed system decrease dramatically when peak mode shapes occur at joint locations,and there are cusp shapes present in mode *** frequencies increase with joint damping increasing,there are different joint damping to achieve maximum system damping for different joint *** nonlinear force-displacement is described by describing function method,one-DOF model containing nonlinear joints is established to analyze joints freeplay and hysteresis *** results show that nonlinear effects of freeplay and hysteresis make dynamic responses switch from one resonance frequency to another frequency when amplitude exceed demarcation *** contact stiffness determine degree of system nonlinearity,while exciting force level,clearance and slipping force affect amplitude of dynamic *** responses of joint dominated deployable truss structure under different sinusoidal exciting force levels are *** test results show obvious nonlinear behaviors contributed by joints,dynamic response shifts to lower frequency and higher amplitude as exciting force *** test results are further compared with analytical results,and joint nonlinearity tested is coincident with hysteresis *** method of joint effects on dynamic characteristics of jointed system is proposed,which ca

关键词： deployable structure joint dynamic mode shape experiment

Silicalite-1 zeolite encapsulated Fe nanocatalyst for Fenton-like degradation of methylene blue

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Chinese Journal of Chemical Engineering 2023年第1期53卷 251-259页

作者： hongwei guo Linyuan Chen Xueying Zhang Huanhao Chen Yan Shao State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China

Encapsulation of Fe nanoparticles in zeolite is a promising way to significantly improve the catalytic activity and stability of Fe-based catalysts during the degradation process of organic ***,Fe nanocatalysts were encapsulated into silicalite-1(S-1)zeolite by using a ligand-protected method(with dicyandiamide(DCD)as a organic ligand)under direct hydrothermal synthesis ***-resolution transmission electron microscopy(HRTEM)results confirmed the high dispersion of Fe nanocatalysts which were successfully encapsulated within the voids among the primary particles of the S-1 *** developed S-1 zeolite encapsulated Fe nanocatalyst(Fe@S-1)exhibited significantly improved catalytic activity and reusability in the catalytic degradation process of methylene blue(MB).Specifically,the developed Fe0.021@S-1 catalyst showed high catalytic degradation activity,giving a high MB degradation efficiency of 100%in 30 min,outperformed the conventional impregnated catalyst(Fe/S-1).Moreover,the Fe@S-1 catalyst afforded an outstanding stability,showing only ca.7.9%activity loss after five cycling tests,while the Fe/S-1 catalyst presented a significantly activity loss of 50.9%after only three ***,the encapsulation strategy enabled a relatively lower Fe loading in the Fe@S-1 catalyst in comparison with that of the Fe/S-1 catalyst,i.e.,0.35%vs.0.81%(mass).Radical scavenging experiments along with electron spin resonance(ESR)measurements confirmed that the major role ofOH in the MB degradation ***,Fe@S-1 catalyst with high molar ratio of[Fe(DCD)]Cl3 is beneficial to form Fe complexes/nanoclusters in the voids(which has large pore size of 1–2 nm)among the primary particles of the zeolite,and thus improving the diffusion and accessibility of reactants to Fe active sites,and thus exhibiting a relatively higher degradation *** work demonstrates that zeolite-encapsulated Fe nanocatalysts present potential applications in the

关键词： Zeolite Encapsulation Fe nanocatalyst Degradation Methylene blue

Survival analysis of car travel time near a bus stop in developing countries

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Science China(Technological Sciences) 2012年第8期55卷 2355-2361页

作者： YANG XiaoBao GAO ZiYou guo hongwei HUAN Mei MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology Beijing Jiaotong UniversityBeijing 100044China Department of Transportation Engineering Beijing Institute of TechnologyBeijing 100081China

This paper presents an important investigation into car travel time affected by mixed traffic flow near a bus stop on the basis of survival analysis *** time data associated with mixed traffic characteristics near a bus stop were collected by video cameras.A hazard-based duration model was introduced to analyze the effects of mixed traffic flow on car travel *** results indicate that mixed traffic flow impacts car travel time *** the presence of bus berthing violation would delay car travel *** proposed model can be used to forecast temporal shifts in car travel time due to changes in mixed traffic *** influential factors related to mixed traffic flow should be given full consideration in the planning and designing of bus stops in developing countries.

关键词： survival analysis travel time duration model bus stop mixed traffic

Post-transcriptional gene silencing in plants： a double-edged sword

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Science China(Life Sciences) 2016年第3期59卷 271-276页

作者： Xinyan Zhang Ying Zhu Huihui Wu hongwei guo State Key Laboratory of Protein and Plant Gene Research College of Life Sciences Peking University Beijing 100871 China peking-Tsinghua Center for Life Sciences Peking University Beijing 100871 China Department of Botany and Plant Pathology Purdue University West Lafayette IN 47907 USA

In plants, post-transcriptional gene silencing(PTGS) protects the genome from foreign genes and restricts the expression of certain endogenous genes for proper development. Here, we review the recent progress about how the unwanted PTGS is avoided in plants. As a decision-making step of PTGS, aberrant transcripts from most endogenous coding genes are strictly sorted to the bidirectional RNA decay pathways in cytoplasm but not to the short interference RNA(si RNA)-mediated PTGS, with the exception of a few development-relevant endogenous si RNA-producing genes. We also discuss a finely balanced PTGS threshold model that plants fully take advantage of the power of PTGS without self-harm.

关键词： post-transcriptional gene silencing short interference RNA coding-transcript-derived siRNA RNA decay