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| 1 | Phytosterol content and the campesterol:sitosterol ratio influence cotton fiber development: role of phytosterols in cell elongation显示文摘Phytosterols play an important role in plant growth and development,including cell division,cell elongation,embryogenesis,cellulose biosynthesis,and cell wall formation.Cotton fiber,which undergoes synchronous cell elongation and a large amount of cellulose synthesis,is an ideal model for the study of plant cell elongation and cell wall biogenesis.The role of phytosterols in fiber growth was investigated by treating the fibers with tridemorph,a sterol biosynthetic inhibitor.The inhibition of phytosterol biosynthesis resulted in an apparent suppression of fiber elongation in vitro or in planta.The determination of phytosterol quantity indicated that sitosterol and campesterol were the major phytosterols in cotton fibers;moreover,higher concentrations of these phytosterols were observed during the period of rapid elongation of fibers.Furthermore,the decrease and increase in campesterol:sitosterol ratio was associated with the increase and decease in speed of elongation,respectively,during the elongation stage.The increase in the ratio was associated with the transition from cell elongation to secondary cell wall synthesis.In addition,a number of phytosterol biosynthetic genes were down-regulated in the short fibers of ligon lintless-1mutant,compared to its near-isogenic wild-type TM-1.These results demonstrated that phytosterols play a crucial role in cotton fiber development,and particularly in fiber elongation. | Shasha Deng Ting Wei Kunling Tan Mingyu Hu Fang Li Yunlan Zhai Shue Ye Yuehua Xiao Lei Hou Yan Pei Ming Luo | 2016 | Science China(Life Sciences)2016，59，2： | 5 |
| 2 | Crystallization in Zr_(60)Al_(15)Ni_(25) bulk metallic glass subjected to rolling at room temperature显示文摘The microstructure evolution of Zr60Al15Ni25 bulk metallic glass during rolling at room temperature is investigated by differential scanning calorimetry(DSC),high-resolution transmission electron microscopy(HRTEM) and selected area electronic diffraction(SAED).The HRTEM images show that shear bands are produced in the rolled specimens,indicating the essence of inhomogeneous deformation due to rolling,and that there exist nanocrystals with size of about 5-10 nm in the transition regions between the shear bands and the undeformed matrix in the rolled specimens with deformation degrees of 80% and 95%.Based on the polyhedral structure model and the shear transformation zone(STZ) theory,the influence of viscous flow,free volume,viscosity and the stress situation on the crystallization behaviors in the metallic glass during rolling is discussed. | YAN ZhiJie,YAN Jun,HU Yong & DANG ShuE School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China | 2010 | Science China(Technological Sciences)2010，53，1： | 3 |
| 3 | A Study on the Characterization of Mechanical Properties of Grade X80 High Strain Line Pipe Steel显示文摘This paper introduces mechanical and metallurgical properties of 27mm thick Grade X80 high strain line pipe steel which aims at constructing long distance natural gas over permafrost and seismic areas.The steel is molybdenum and boron free.Dual phase of the X80 steel plates are regulated by thermal-mechanical controlled processing.The outer diameter of 1219mm pipes are manufactured by UOE process.DWTT toughness and longitudinal tensile properties including the Rt0.5/Rm,Rt1.5/Rt0.5 and Rt2.0/Rt1.0 are analyzed on both the plates and the pipes.Strain aging properties are also evaluated on the base material of the pipe,demonstrating that the pipe complies well with the pipeline construction requirements.Strengthening effects of precipitates are analyzed,revealing a 58.1MPa strengthening contribution by precipitates less than 20nm in size.Dislocation hardening is approximately 176MPa in the present studied steel. | Weihua Sun Shue Hu Guobao Li Hao Yu Lei Zhang Liwei Liu | 2015 | 材料科学研究(中英文版)2015，4，4： | 0 |
| 4 | Empowering beginners in bioinformatics with ChatGPT显示文摘The impressive conversational and programming abilities of ChatGPT make it an attractive tool for facilitating the education of bioinformatics data analysis for beginners.In this study,we proposed an iterative model to fine-tune instructions for guiding a chatbot in generating code for bioinformatics data analysis tasks.We demonstrated the feasibility of the model by applying it to various bioinformatics topics.Additionally,we discussed practical considerations and limitations regarding the use of the model in chatbot-aided bioinformatics education. | Evelyn Shue Li Liu Bingxin Li Zifeng Feng Xin Li Gangqing Hu | 2023 | Quantitative Biology2023，11，2： | 0 |
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