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Measurement of Binding force between Microtubule-Associated Protein and Microtubule

Chinese Physics Letters 2007年第9期24卷 2714-2716页

作者：徐春华郭红莲屈娥李兆霖袁明程丙英张道中 Optical Physics Laboratory Institute of Physics and Center for Condensed Matter Physics Chinese Academy of Sciences Beijing 100080 State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural University Beijing 100094

Microtubule-associated proteins （MAPs） are important proteins in cells. They can regulate the organization, dynamics and function of microtubules. We measure the binding force between microtubule and a new plant MAP, i.e. AtMAP65-1, by dual-optical tweezers. The force is obtained to be 14.6 ± 3.5 pN from the data statistics and analysis. This force measurement is helpful to understand the function and mechanism of MAPs from the mechanical point of view and lays the groundwork for future measurements of the mechanical properties of other biological macro-molecules.

关键词： OPTICAL TWEEZERS SYSTEM breaking force DISPLACEMENT RIGIDITY MOLECULE

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Differences in breaking behavior of rice leaves under microwave and naturally drying processes

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 89-100,F0002页

作者： Meilin Wang Zhong Tang Ben Zhang Yu Li Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina

In order to fight for good farming time or harvest in bad weather,combine harvester will produce more broken leaves when threshing high moisture content rice,which will seriously hinder the grain cleaning *** this study,the breaking behavior of rice leaves under different microwave drying time and drying power was ***,based on the appearance of freshly rice leaves undergoing microwave drying,the changing property of moisture content,weightlessness rate and temperature rise of rice leaves were tested and ***,the tensile breaking force of freshly rice leaves under different microwave drying time and drying power was tested and compared with the tensile breaking force of naturally dried ***,the optimal microwaves parameters of rice leaves after drying which could result in greater breaking force than the natural drying state were *** result showed that microwave drying method will reduce the moisture content of rice leaves and change the microstructure,which would affect the tensile-breaking property of rice *** maximum tensile breaking force of rice leaves appeared at microwave dried power 70 W for 5-8 min and at microwave dried power 210 W for 3-4 *** tensile breaking property of rice leaves at microwave dried power 350 W for 6-8 min were the weakest,which was lower than that of fresh rice ***,the optimal microwave drying parameters of rice leaves will provide a basis for the application of microwave technology in the threshing process.

关键词： rice harvesting rice leaves microwave drying moisture content breaking force

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Key indicators affecting maize stalk lodging resistance of different growth periods under different sowing dates

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Journal of Integrative Agriculture 2020年第10期19卷 2419-2428页

作者： WANG Qun XUE Jun CHEN Jiang-lu FAN Ying-hu ZHANG Guo-qiang XIE Rui-zhi MING Bo HOU Peng WANG Ke-ru LI Shao-kun Key Laboratory of Oasis Eco-Agriculture Xinjiang Production and Construction Corps/agricutura1 CollegeShihezi UniversityShihezi 832000P.R.China Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture and Rural AffairsBejjing 100081P.R.China Research Institute of Agricultural Sciences Sixth Division of Xinjiang Production and Construction CorpsWujiaqu 831300P.R.China Chuxiong State Research and Extension Institute of Agricultural Science Chuxiong 675000P.R.China

The accurate evaluation of maize stalk lodging resistance in different growth periods enables timely management of lodging risks and ensures stable and high maize ***,we established five diferent sowing dates to create diferent conditions for maize *** evaluated the effects of the different growth conditions on lodging resistance by determining stalk morphology,moisture content,mechanical strength and dry matter,and the relationship between stalk breaking force and these indicators during the silking stage(R1),milk stage(R3),physiological maturity stage(R6),and 20 days after *** height at R1 positively affected stalk breaking *** R3,the cofficient of ear height and the dry weight per unit length of basal internodes were key indicators of stalk lodging *** R6,the key indicators were the coefficient of the center of gravity height and plant fresh *** R6,the key indicator was the coefficient of the center of gravity *** crushing strength of the fourth internode correlated significanty and positively with the stalk breaking force from R1 to R6,which indicates that crushing strength is a reliable indicator of stalk mechanical *** results suggest that high stalk strength and low ear height beneft lodging resistance prior to *** and after R6,the cofficient of the center of gravity height and the mechanical strength of basal internodes can be used to evaluate plant lodging resistance and the appropriate time for harvesting in fields with a high lodging risk.

关键词： maize lodging resistance stalk strength growth periods breaking force

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Prediction of Burst Pressure of a Radial Truck Tire Using Finite Element Analysis

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World Journal of Engineering and Technology 2016年第2期4卷 228-237页

作者： Kyoung Moon Jeong R&D Center Kumho Tire Co. Inc. Yongin-si South Korea

This paper is concerned with the numerical prediction of the burst pressure of a radial truck tire. Even though relatively rare, the tire fracture or failure brings up a big accident. Especially, the tire burst or rupture is a rapid loss of inflation pressure of a truck and bus tire leading to an explosion. The tire burst pressure, under this extreme loading condition, can be predicted by identifying the pressure at which the cord breaking force of the composite materials is attained. Recently, the use of finite element analysis in tire optimal design has become widely popular. In order to determine the burst pressure of a radial truck tire, an axisymmetric finite element model has been developed using a commercial finite element code with rebar element. The numerical result shows that the bead wire among the various layers modeled the rebar element breaks off first in the radial truck tire. The finite element modeling with the rebar element on the bead wire of a radial truck tire is able to well predict the tire burst pressure identifying the pressure at which the breaking force of steel bead wires is reached. The model predictions of tire burst pressure should be correlated with test data, in which case the tire is hydro-tested to destruction. The effect of the design change with the different bead structure on the tire burst pressure is discussed.

关键词： Burst Pressure Radial Truck Tire Finite Element Analysis breaking force

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