Influence of host plants on the development, survivorship, and fecundity of the summer fruit tortrix moth, Adoxophyes orana (Lepidoptera: Tortricidae)

Li Guang‐wei,Wang Hui‐min,Yang Wen‐tao,Chen Xiu‐lin,Li Bo‐liao,Chen Yu‐xin 한국곤충학회 2021 Entomological Research Vol.51 No.10

The summer fruit tortrix moth Adoxophyes orana is a seriously damaged leaf roller pest for fruit trees. In this study, we evaluated the effect of five host plants (apple, Malus domestica B.; peach, Prunus persica var. nectarina; apricot, Armeniaca vulgaris Lam.; mulberry, Morus alba L.; and jujube, Ziziphus jujuba M.) on the development, survival, and fecundity of A. orana under laboratory conditions. Results showed that the development times of A. orana on jujube were significantly longer than those on the other four plants. The preimaginal survival rate was influenced by the host plants, which were fed during the larval stage, and with the highest on peach, followed by apple, apricot, and mulberry, and with the lowest on jujube. Adult females from larvae reared on apricot laid the greatest numbers of eggs (318.11 eggs per female), while that on apple, jujube, and mulberry was smaller, and no significant difference was observed among them. The highest intrinsic rate of increase (rm) was observed on peach and apricot; these two fruit trees were considered to be the most suitable host plant for A. orana because of the shorter developmental duration, higher survival rate, and the highest fecundity.

Comparisons of Production Costs of Japonica Rice Between China and Korea

( Wei Guang Pan ),( Chung Gil Chung ) 한국농촌경제연구원 2004 Journal of Rural Development Vol.27 No.2

In order to compare the comparative advantage of japonica between China and Korea, the study analyzes the production cost. After comparing the cost and its structure, it is found that the production of Japonica in China has more comparative advantage obviously. But the increasing rate is much higher than that of Korea in recent 10 years. In the long term, the gap between two countries will become smaller, while the inferior advantage of Korea can`t be changed during short-mid term. Some measures should be adopted to develop the competitiveness of japonica in Korea, such as, adjusting agricultural structure, enlarging the land scale and making quality differentiation.

Transverse Tensile Deformation and Failure of Three-dimensional Five-directional Braided Carbon Fiber Composites

Wei Zhou,Zhi-yuan Wei,Guang-fei Wang,Kang-ning Han,Ran Liu,Lian-Hua Ma 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

Accurate characterisation of transverse tensile deformation and damage evolution is of importance for evaluatingthe failure behaviors of three-dimensional (3D) braided composites. In the present study, a finite element method (FEM) andseveral non-destructive testing methods including acoustic emission, digital image correlation, and infrared thermography aredeveloped to investigate the transverse tensile deformation and damage evolution of 3D five-directional braided composites. In the finite element approach, a matrix-impregnated fiber bundles (MIFB) model and a representative volume cell (RVC)model, which take into account the fiber bundles and matrix, are respectively established to predict the effective mechanicalproperties of fiber bundles and simulate the deformation and progressive damage of such composites. The damaged locationsand the failure modes including matrix crack, fiber debonding and shear fracture of fiber are predicted and verified byexperimental tests. The non-destructive tests show that the transverse tensile fracture process can be divided into four stageswhich correspond to acoustic emission signals severally. The combination of the FEM based numerical modeling andmultiple non-destructive characterisation methods can accurately monitor the deformation and damage behaviors of 3Dbraided composites under transverse tensile loads and thus provide a reference for structural health monitoring of compositesin practical application.

Expression profiles and ligand-binding properties of two odorant-binding proteins from Grapholita molesta (Busck) (Lepidoptera: Tortricidae)

Guang Wei Li,Xiu Lin Chen,Yong Sun,Yu Xing Chen,Shi Cai Xu,Jun Xiang Wu 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.4

The ligand-binding function of odorant binding proteins (OBPs) that are expressed exclusively or enriched in antennae are well-studied, whilst the ligand binding properties of relatively low expressed OBPs in insect antennae are still unclear. Here, two low expressed GmolOBPs (namely GmolOBP12 and GmolOBP16) were cloned based on the antennal transcriptome of Grapholita molesta, and then their expression profiles and binding properties were investigated via real-time quantitative PCR (qRT-PCR) and fluorescence binding assays, respectively. Multiple sequence alignment and phylogenetic tree analyses displayed that both of GmolOBP12 and GmolOBP16 possessed the typical six-cysteine motifs unique to the classic OBPs subfamily and were classified as such. Although the abundance of transcripts of GmolOBP12 and GmolOBP16 were relatively low compared to that of many other OBPs in the antennal transcriptome of G. molesta, qRT-PCR results indicated that the transcript levels of GmolOBP12 and GmolOBP16 in antennae were significantly higher than those in other tissues. GmolOBP12 displayed higher expression level in male antennae than in female antennae, while the transcript level of GmolOBP16 in antennae was similar for both sexes. Both recombinant GmolOBP12 and GmolOBP16 exhibited strong binding affinities to the sex pheromone (Z)-8-dodecenyl alcohol and host-plant volatile pear ester. Besides, rGmolOBP12 showed outstanding binding affinities to (E)-2-hexenal, benzaldehyde, 1-hexanol, and (Z)-3-hexenyl acetate with K i values of 4.21, 6.81, 4.68 and 4.68 μM, respectively. rGmolOBP16 had moderate binding abilities with hexanal, decanal, 1-hexanol, methyl myristate and benzonitrile. We speculated that GmolOBP12 may have dual functions in recognition of green leaf volatiles and sex pheromone components and GmolOBP16 may participate in the detection of host-plant volatiles in chemoreception.

Isoindolin-1-ones from the stems of Nicotiana tabacum and their antiviral activities

Guang-Yu Yang,Jia-Meng Dai,Zhen-Jie Li,Jin Wang,Feng-Xian Yang,Xin Liu,Jing Li,Qian Gao,Xue-Mei Li,Yin-Ke Li,Wei-Guang Wang,Min Zhou,Qiu-Fen Hu 대한약학회 2022 Archives of Pharmacal Research Vol.45 No.8

In previous studies, several isoindolin-1-oneanalogs that exhibited signifi cant anti-tobacco mosaic virus(anti-TMV) activities were isolated from Nicotiana tabacum . Since gene-editing mutants provide a new sample for thediscovery of active metabolites, we focused on the stems ofYN-18–23 (a mutant N. tabacum for gene editing with thealkaloid metabolic pathway cultivated by Yunnan TobaccoCompany), which led to the isolation of four new ( 1–4 )and four known ( 5–8 ) isoindolin-1-ones. To the best of ourknowledge, nicindole C ( 3 ) is the fi rst subclass of isoindolin-1-one bearing a pentacyclic ketone, while nicindole D ( 4 )is the fi rst example of isoindolin-1-one bearing a methylpyridin-2-(1 H )-one moiety. Compounds 1–4 were testedfor their anti-TMV activities, and the results revealed thatcompounds 1 , 3 , and 4 exhibited high anti-TMV activities atconcentrations of 20 μM with inhibition rates of 48.6, 42.8,and 71.5%, respectively. These rates are higher than the inhibitionrate of the positive control (33.2%). The mechanisticstudy of compound 4 , which had the highest anti-TMV activityrevealed that increased potentiation of defense-related enzyme activities and downregulation of expression of theNtHsp70 protein may induce resistance in tobacco againstthe viral pathogen TMV. Molecular docking studies alsorevealed that the isoindolin-1-one substructure is fundamentalfor anti-TMV activity. The methyl-pyridin-2-(1 H )-onemoiety in compound 4 and the 2-oxopropyl groups in compounds1 and 3 at the N -2 position may increase inhibitoryactivities. This study of the structure–activity relationshipis helpful for fi nding new anti-TMV activity inhibitors. Tostudy whether the isoindolin-1-ones have broader antiviralactivities, compounds 1–4 were also tested for their antirotavirusactivities. Compound 4 exhibited high anti-rotavirusactivity with a therapeutic index (TI) value of 20.7. This TI value is close to that of the positive control (20.2).

Sparse Structured Non-fragile H∞ Controller Design for Linear Systems

Wei-Wei Che,Guang-Hong Yang,Xiao-Zheng Jin 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.4

This paper presents a study on the problem of designing non-fragile H∞ controllers with sparse structures for linear continuous-time systems. A new algorithm is proposed to define and further design sparse structured controllers. Firstly, sparse structures are specified from a given fully parameterized H∞ controller. Then, a three-step design procedure for non-fragile dynamic output feedback H∞ controllers with the sparse structures is provided. The resulting designs guarantee that the closed-loop system is asymptotically stable and the H∞ performance from the disturbance to the regulated output is less than a prescribed level. A numerical example is given to illustrate the design methods.

Study on Optimum Design of Vibration Isolation Handles

Wei Guang Feng,Kazuto Seto,Fumio Doi,Itsuro Kajiwara 대한기계학회 1997 Asia-Pacific Vibration Conference Vol.1 No.1

Borehole stability analysis in oil and gas drilling in undrained condition

Wei, Jian-Guang,Yan, Chuan-Liang Techno-Press 2014 Geomechanics & engineering Vol.7 No.5

Borehole instability during drilling process occurs frequently when drilling through shale formation. When a borehole is drilled in shale formation, the low permeability leads to an undrained loading condition. The pore pressure in the compressed area near the borehole may be higher than the initial pore pressure. However, the excess pore pressure caused by stress concentration was not considered in traditional borehole stability models. In this study, the calculation model of excess pore pressure induced by drilling was obtained with the introduction of Henkel's excess pore pressure theory. Combined with Mohr-Coulumb strength criterion, the calculation model of collapse pressure of shale in undrained condition is obtained. Furthermore, the variation of excess pore pressure and effective stress on the borehole wall is analyzed, and the influence of Skempton's pore pressure parameter on collapse pressure is also analyzed. The excess pore pressure decreases with the increasing of drilling fluid density; the excess pore pressure and collapse pressure both increase with the increasing of Skempton's pore pressure parameter. The study results provide a reference for determining drilling fluid density when drilling in shale formation.

Molecular characterization of glutathione peroxidase gene from the Liver of silver carp, bighead carp and grass carp

( Guang Zhao Li ),( Xu Fang Liang ),( Wei Yao ),( Wan Qin Liao ),( Wei Feng Zhu ) 생화학분자생물학회 2008 BMB Reports Vol.41 No.3

Active Disturbance Rejection Control for Nanopositioning Systems with Piezoelectric Actuators

Wei Wei,Ran Zhang,Jing Wang,Guang-Bo Hao 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10

Nanopositioning proposes a high demand for its control system. However, hysteresis, a common nonlinear phenomenon existing in piezoelectric actuator, decreases precision of nanopositioning. In this paper, active disturbance rejection control (ADRC) is designed to estimate and cancel the influence of hysteresis, and integral time absolute error (ITAE) optimal index is chosen to determine the parameters of ADRC. Simulations are performed on the basis of mathematic model of nanopositioning system, and numerical results show that ADRC is effective in the control of nanopositioning.