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First report of Bradysia difformis (Diptera: Sciaridae) Damage to Phalaenopsis orchid in China
Qun Xin Han,Dong Mei Cheng,Juan Luo,Cui Zuan Zhou,Qing Sheng Lin,Mei Mei Xiang 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.1
Phalaenopsis orchid is among the most valuable ornamental flowering plants in the world. Since visible damage substantially decreases its amenity, limited damage is allowed in its production. An unknown insect species (Diptera: Sciaridae)was found to cause serious damage to the seedling of the Phalaenopsis orchid in greenhouses in Guangdong, China. The insect occurred in high populations in almost all greenhouses that grow Phalaenopsis orchid and the number of sciarid adults trapped on a yellow sticky card could reach as many as 303 in 24 h. An effectivemanagement strategy on any pest requires an accurate identification. Therefore, it is urgent to identify this pest correctly to mitigate its damage to the industry. Damage to Phalaenopsis orchid and morphological characteristics of the pest was described in this study. Molecular analyses based on the 488-bp portion of the mitochondrialDNA fromthe cytochrome oxidase I(mt COI) regionwere conducted to supplementmorphological characteristics in identifying this pest. Bothmorphological characteristics and phylogenetic tree constructedwith mt COI genes identified this sciarid as Bradysia difformis Frey, 1948 (= Bradysia paupera Tuomikoski, 1960) (Diptera: Sciaridae). A literature search indicated that B. difformis has been a common pest of greenhouse and forestry nurseries in Europe and South Africa. Our study is the first record of B. difformis damaging Phalaenopsis orchid in China.
Analysis of Pressure Distribution of the Bolted Joints Based on the Finite Element Method
Sheng-ao Wang,Min Zhu,Fei Wu,Tian-xi Liang,Zhao-qun Shao,Yi-long Liu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
Bolted joints widely exist in the field of the national defense industry. However, its nonlinear stiffness degradation will occur under tangential load which may lead to the reliability reduction. According to Coulomb friction theory, the pressure distribution is the key in the tangential degradation of bolted joints. Therefore, this paper aims to analyze the pressure distribution of bolted joints. Firstly, we established a threaded bolt model and two simplified models. Secondly, the accuracy of the three models describing the contact area is verified, and the influence of preload and material properties on the contact radius is analyzed. Thirdly, we compared the pressure distribution of the three models, and results show that the smooth bolt model is more suitable for pressure analysis. Finally, the accuracy of several different functions to characterize the pressure distribution of bolted joints is analyzed, and results indicated that the Fernlund function is optimal. This paper provides a feasible simplified bolt model for finite element analysis, and the optimal pressure distribution function can be applied in the tangential stiffness degradation modeling.
Shui Wang,Qun-Sheng Li,Zhao Li 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
The solubility of 4-(3,4-dichlorophenyl)-1-tetralone in eleven alcohols (methanol, ethanol, 1-propanol, 1- butanol, 1-pentanol, 1-hexanol, 2-propanol, 2-butanol, 2-pentanol, 1,2-propanediol, 1,3-propanediol) was measured by using a laser technique with a temperature range from 283 K to 323 K, and at atmospheric pressure. For mono n-alcohols, the solubility is the lowest in methanol, increasing with the carbon chain of the alcohols. The results were correlated with a semi-empirical equation. The experimental solubility and correlation equation in this work can be used as essential data and models in the purification process of 4-(3,4-dichlorophenyl)-1-tetralone.
Shui Wang,Qun-Sheng Li,Zhao Li 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
using a laser technique in the temperature range from 283.15 to 323.15 K. The results were correlated with a semi-empirical equation. The experimental solubility and correlation equation in this work can be used as essential data andmodels in the purification process of 4-(3,4-dichlorophenyl)-1-tetralone.
Two New Metabolites with Cytotoxicities from Deep-Sea Fungus, Aspergillus sydowi YH11-2
De-Hai Li,Sheng-Xin Cai,Li Tian,Zhen-Jian Lin,Tian-Jiao Zhu,Yu-Chun Fang,Pei-Pei Liu,Qian-Qun Gu,Wei-Ming Zhu 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.9
Two new compounds, 2, 3, 5-trimethyl-6-(3-oxobutan-2-yl)-4H-pyran-4-one (1) and (2R)-2, 3- dihydro-7-hydroxy-6, 8-dimethyl-2-[(E)-prop-1-enyl] chromen-4-one (2), together with six known compounds (3-8), were isolated from a deep-sea fungus, identified as Aspergillus sydowi, by a bioassay-guided method. Their structures were elucidated by spectroscopic methods and the cytotoxicities were evaluated by SRB method.
( Yun Deng ),( Bi Sheng Liu ),( Xiong Wei Fan ),( Yue Qun Wang ),( Ming Tang ),( Xiao Yang Mo ),( Yong Qing Li ),( Zao Chu Ying ),( Yong Qi Wan ),( Na Luo ),( Jun Mei Zhou ),( Xiu Shan Wu ),( Wu Zhou 한국생화학분자생물학회 (구 한국생화학회) 2010 BMB Reports Vol.43 No.3
In this study, we report the identification and characterization of a novel C2H2 zinc finger protein, ZNF552, from a human embryonic heart cDNA library. ZNF552 is composed of three exons and two introns and maps to chromosome 19q13.43. The cDNA of ZNF552 is 2.3 kb, encoding 407 amino acids with an amino-terminal KRAB domain and seven carboxyl-terminal C2H2 zinc finger motifs in the nucleus and cytoplasm. Northern blotting analysis indicated that a 2.3 kb transcript specific for ZNF552 was expressed in liver, lung, spleen, testis and kidney, especially with a higher level in the lung and testis in human adult tissues. Reporter gene assays showed that ZNF552 was a transcriptional repressor, and overexpression of ZNF552 in the COS-7 cells inhibited the transcriptional activities of AP-1 and SRE, which could be relieved through RNAi analysis. Deletion studies showed that the KRAB domain of ZNF552 may be involved in this inhibition. [BMB reports 2010; 43(3): 193-198]