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Morphology and transcriptome differences between the haploid and diploid drones of Apis cerana
Wei-Yu Yan,Hai-Yan Gan,Shu-Yun Li,Jing-Hua Hu,ZilongWang,Xiaobo Wu,Zhi Jiang Zeng 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4
In general, drone honey bees are haploid and develop from unfertilized eggs. However, a diploid drone can arise in an inbred colony. In this study, the morphological characteristics and gene expression profile of the haploid and diploid drones of Apis cerana were analyzed to reveal the differences between them. The ploidy level of the droneswas identified by FlowCytometry (FCM). The characters of the forewings,wetweight of reproductive organs and of newly emerged drones, were investigated. Then, a high throughput transcriptomic analysis was performed using RNA-seq in diploid and haploid drones. The results showed that the wet weight and reproductive organs of diploid droneswere significantly lighter than those of haploid drones. About 201 million high-quality reads were generated from RNA-seq, and 75.99–78.12% of the data weremapped to Apis cerana genome. 360 genes were differentially expressed between diploid and haploid drone, with 152 up-regulated and 208 downregulated in the diploid drones. Functional analysis identified that these genes were significantly enriched in 28 pathways. Comparative transcriptomic analysis detected several differentially expressed genes, which lay a foundation for future studies on molecular mechanisms underlying biology difference in drones in Apis cerana.
Antimicrobial glycoalkaloids from the tubers of Stephania succifera
Yan-Bo Zeng,Dai-Jing Wei,Wen-Hua Dong,Cai-Hong Cai,De-Lan Yang,Hui-Min Zhong,Wen-Li Mei,Hao Fu Dai 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.4
Three new glycoalkaloids, N-formyl-asimilobine-2-O-b-D-glucoside (1), (-)-1-O-b-D-glucoside-8-oxotetrahydropalmatine(2), and 1-N-monomethylcarbamateargentinine-3-O-b-D-glucoside (3) were isolated fromtubers of Stephania succifera. The structures were establishedbased on spectroscopic analysis, and the antimicrobialactivities of the three glycoalkaloids are reported.
Constructing foldable cylindrical surfaces via unfolded waterbomb origami units
Zhao Yan,Wei Yinglei,Jia Yiyang,Li Shiling,Zhang Mingyue,Zeng Lanling,Yang Yang,Mitani Jun 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.4
Origami tessellations have shown the potential to be utilized for approximating curved target surfaces by folding a set of elemental units. As those units are in partially folded states, the origami approximation captures the outline of the target while demonstrating a corrugated surface. In this paper, we focus on the cylindrical surface and propose a method for constructing its discrete version via square or rectangular units with crease patterns inspired by the waterbomb tessellation. We unify the unit size through optimization to realize cost-efficient constructions. Three-dimensional curved structures are deployed by folding collinear creases between adjacent rows of units and the other creases in each row are remained unfolded. The deployed structure can still be folded to a compact state by folding all creases. To flexibly approximate the outline of the target surface, we analyse relationships between the width and height of the rectangular unit and utilize variations of the waterbomb tessellation to control the region of the origami structure when fully folded. The proposed method provides a novel solution to the so-called inverse-origami-design problem for generating foldable cylindrical surfaces using unfolded waterbomb origami units.
Jianling Xie,Tianlan Wei,Yan Zhan,Yan Zeng,Xiang Huang,Xia Liu,Katarzyna Gallo 아시아영어교육학회 2021 The Journal of Asia TEFL Vol.18 No.4
Grounded in social cognitive theory and expectancy-value theory, the current study aimed to present a demotivation scale — Learner Perceptions of Demotivators Scale (LPDS) — designed specifically for use in L2 research and tested empirically to provide evidence of its construct, validity, and reliability. Study 1 sample consisted of 295 Chinese college English learners. An exploratory factor analysis offered preliminary support for a factor structure comprising three dimensions: negative teacher behavior, loss of task value, and low expectancy for success. Study 2 sample consisted of another 320 Chinese college English learners. The proposed factor structure was further corroborated through confirmatory factor analysis, and support for its validity was provided by means of correlating the three dimensions with academic performance and self-efficacy measures. Specifically, all the correlations were negative except for the positive association between academic performance and negative teacher behavior. Further, whereas the model fit confirmed a well-fitting second-order model, one low first-order loading (negative teacher behavior) does not seem to support a second-order factor model. Therefore, the three dimensions should be regarded as separate to best capture the nuances of different demotivators. By establishing a nomological network (demotivation, academic performance, and self-efficacy), the current study illuminates selected aspects of ESL pedagogy.
Study of the Electric Field Screening Effect for Field Emitter Arrays
Nannan Li,Fei Yan,Shucai Pang,Lei Chen,Dazhi Jin,Wei Xiang,De Zhang,Jingyi Dai,Baoqing Zeng 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.8
Understanding the influence of the interaction of emitters on the field emission performance of a field emitter array is of great importance for the design of a multi-emitter device. In this work, a screening factor S is defined to quantify the effect of electric field screening due to the interaction of emitters in an array. A three-dimensional finite integration technique is used to study the electric field screening effect for Spindt-type field emitter arrays which have potential applications in flatscreen displays and high-power vacuum electronics. The dependences of the electric field screening on the tip-to-tip spacing, half-angle of the emitter, height of the emitter and radius of the tip’s curvature are analyzed. The effects of the variations in the size of the emitter’s geometry on the most efficient arrangement to achieve maximum emission efficiency in an array are discussed.
Hydrogen sulfide inhibits the growth of Escherichia coli through oxidative damage
Liu-Hui Fu,Zeng-Zheng Wei,Kang-Di Hu,Lan-Ying Hu,Yan-Hong Li,Xiao-Yan Chen,Zhuo Han,Gai-Fang Yao,Hua Zhang 한국미생물학회 2018 The journal of microbiology Vol.56 No.4
Many studies have shown that hydrogen sulfide (H2S) is both detrimental and beneficial to animals and plants, whereas its effect on bacteria is not fully understood. Here, we report that H2S, released by sodium hydrosulfide (NaHS), significantly inhibits the growth of Escherichia coli in a dose-dependent manner. Further studies have shown that H2S treatment stimulates the production of reactive oxygen species (ROS) and decreases glutathione (GSH) levels in E. coli, resulting in lipid peroxidation and DNA damage. H2S also inhibits the antioxidative enzyme activities of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) and induces the response of the SoxRS and OxyR regulons in E. coli. Moreover, pretreatment with the antioxidant ascorbic acid (AsA) could effectively prevent H2S-induced toxicity in E. coli. Taken together, our results indicate that H2S exhibits an antibacterial effect on E. coli through oxidative damage and suggest a possible application for H2S in water and food processing.
IL-35 Over-expression is Associated with Genesis of Gastric Cancer
Fan, Yong-Gang,Zhai, Jing-Ming,Wang, Wei,Feng, Bing,Yao, Guo-Liang,An, Yan-Hui,Zeng, Chao Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7
Overexpression of interleukin (IL)-35 has been found in a variety of malignancies, but the expression status in gastric cancer has yet to be elucidated clearly. In the present study, positive expression of EBI3 and p35 was 63.3% and 70.0% of cases, respectively. EBI3 expression was strongly related with larger tumor size and invasion depth (P<0.05). Similarly, expression of p35 was also correlated with larger tumor size (P<0.05). These results indicate that IL-35 might be involved in growth of gastric cancer. Interestingly, EBI3 and p35 expressions were positive correlated with Ki-67 expression. Moreover, EBI3 immunoreactivity was associated with Bcl-2 staining. Our data suggest IL-35 is correlated with genesis of gastric cancer by regulating growth and apoptosis.
Honeybees (Apis mellifera) modulate dance communication in response to pollution by imidacloprid
Zhang Zu Yun,Li Zhen,Huang Qiang,Yan Wei Yu,Zhang Li Zhen,Zeng Zhi Jiang 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Imidacloprid, one of the most commonly used insecticides, is highly toxic to honeybees and other beneficial insects. Imidacloprid is a chloronicotinyl insecticide, which has a highly specific affinity to the nicotinic acetylcholine receptors (nAChRs) in the honeybee’s nervous system. So it may interfere with dance behavior and memory formation. We found the waggle dances were modulated in honeybees fed sucrose water containing imidacloprid (pesticide group) compared to those fed normal sucrose water (control group). In our data, dancers of the pesticide group significantly increased the variance of divergence angle and the return phases in waggle dances than the control group. And the dance followers in pesticide group significantly increased the variance of crop content than the control group. Furthermore, four learning and memory related genes were significantly regulated at the gene expression levels between pesticide and control group. Our data revealed that the sublethal dose of imidacloprid impaired the honeybees’ learning and memory and resulted in cognitive disorder. The dancers may adjust their recruitment behavior leading to the observed reduced number of followers. We conclude that modulation of in-hive communication serves to protect the colony from foraging toxic food.