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Overexpression of a maize MYB48 gene confers drought tolerance in transgenic arabidopsis plants
Yan Wang,Qianqian Wang,MingLi Liu,Chen Bo, Xi Wang,Qing Ma,Beijiu Cheng,Ronghao Cai 한국식물학회 2017 Journal of Plant Biology Vol.60 No.6
MYBs are a vital family of transcription factorsthat play critical roles in plant development and stressresponse. However, knowledge concerning the functions ofMYBs in the non-model plants is still limited. In this study,we isolated a R1-type MYB gene from maize (Zea mays L.),designated as ZmMYB48. Quantitative RT-PCR analysisdemonstrated that ZmMYB48 expression was induced bydrought and ABA treatments. Subcellular localization analysisrevealed that ZmMYB48 protein was targeted to the nucleusin tobacco leaf epidermal cells. Transactivation assay in yeastdemonstrated that ZmMYB48 had transcriptional activationability. Heterologous overexpression of ZmMYB48 inArabidopsis remarkably improved plant tolerance to droughtstress, as determined through physiological analyses ofsurvival rate, relative water content, malonaldehyde content,relative electrolyte leakage and proline content. Moreover,overexpression of ZmMYB48 enhanced the expression ofstress/ABA-responsive genes such as P5CS1, RD22, RD29Band ABI1. In addition, ZmMYB48-overexpressing plantsaccumulated higher content of ABA than WT plants underdrought stress. These results demonstrate that ZmMYB48might act as a positive regulator that participates in thedrought stress response through ABA signalling.
Xi-yuan Zheng,Chang-hong Wang,Zi-jia Zhang,Gui-xin Chou,Tao Wu,Xue-mei Cheng,Zheng-tao Wang 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.9
Acetylcholinesterase inhibitors (AChEIs) currently form the basis of the newest drugs available for the treatment of Alzheimer's disease. For the aim of screening effective AChEIs, the methanol extracts of the seeds of genus Peganum were found to show significant inhibitory activity of acetylcholinesterase enzyme (AChE) using an in vitro TLC-bioautographic assay. In further studies to seed of P. nigellastrum Bunge, activity-guided fractionation led to the isolation of two new alkaloids nigellastrine Ⅰ (9) and nigellastrine Ⅱ (10), and along with eight known alkaloids, vasicinone (1), vasicine (2), harmine (3), deoxyvasicinone (4), deoxyvasicine (5), harmaline (6), harmol (7), harman (8), in which harmol and harman were first isolated from species P. nigellastrum Bunge. As active constituents, all compounds showed good inhibitory activities against AChE. The results of in vitro semi-quality TLC-bioautographic assay showed that harmine, harmaline and harmol displayed a similar AChE inhibitive activities comparing to galanthamine. These results indicated that these alkaloids in P. nigellastrum Bunge could be a potent class of AChEIs.
Effect of Joint Stiffness on the Stability of Cable-braced Grid Shells
Xi Wang,Ruo-qiang Feng,Gui-rong Yan,Feng-cheng Liu,Wei-jia Xu 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4
Bolted joints used in cable-braced grid shells are typically semi-rigid joints, and the joint stiffness has a significant effect on the stability of cable-braced grid shells. The effect of joint stiffness on the stability of cable-braced grid shells is studied in this paper. Based on the experimental results of improved bolted joints, finite element models of elliptic paraboloid cable-braced grid shells with bolted joints are established, and spring elements are used to simulate the joint stiffness. The effect of the joint stiffness on the nonlinear buckling load is studied by changing the joint stiffness. The main conclusions are as follows. First, the joint rotational stiffness has a significant effect on the failure mode. When the joint rotational stiffness is small to a certain extent, the failure mode of cable-braced grid shells changes from overall buckling to local buckling. Second, the nonlinear failure mode is similar to the first-order eigenvalue buckling mode and the maximal compression stress distribution. The structural integrity is weakened, and the maximal steel tube compression stress decreases with the decrease of the joint rotational stiffness. The smaller the joint rotational stiffness, the lower the utilization rate of steel strength. The results suggest that the joint stiffness of elliptic paraboloid cable-braced grid shells should not be less than 20% of the rigid joint stiffness.
Prediction model of surface subsidence for salt rock storage based on logistic function
Wang, Jun-Bao,Liu, Xin-Rong,Huang, Yao-Xian,Zhang, Xi-Cheng Techno-Press 2015 Geomechanics & engineering Vol.9 No.1
To predict the surface subsidence of salt rock storage, a new surface subsidence basin model is proposed based on the Logistic function from the phenomenological perspective. Analysis shows that the subsidence curve on the main section of the model is S-shaped, similar to that of the actual surface subsidence basin; the control parameter of the subsidence curve shape can be changed to allow for flexible adjustment of the curve shape. By using this model in combination with the MMF time function that reflects the single point subsidence-time relationship of the surface, a new dynamic prediction model of full section surface subsidence for salt rock storage is established, and the numerical simulation calculation results are used to verify the availability of the new model. The prediction results agree well with the numerical simulation results, and the model reflects the continued development of surface subsidence basin over time, which is expected to provide some insight into the prediction and visualization research on surface subsidence of salt rock storage.
Yayi Cheng,Jianfeng Huang,Liyun Cao,Yongfeng Wang,Ying Ma,Shaohua Xi,Bingyao Shi,Hui Xie,Jiayin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01
SnSe2 and SnSe nanocrystals were prepared using a simple solvothermal method by changing the molar ratio of SnCl2 · 2H2O and Se powder. When SnSe2 and SnSe are acted as lithium ion battery anodes, the SnSe hybrid structure shows more excellent electrochemical performance than that of SnSe2 interconnected nanosheet. It delivers a reversible capacity of 1023 mA h g -1 at a current density of 200 mA g -1, and maintaining a capacity of 498 mA h g -1 till 120 cycles. According to many present works, SnSe2 with interconnected thin nanosheet should possess more superior property than hybrid structured SnSe due to short charge transfer paths. However, in our research, the result is the opposite. Therefore, we consider that the superior electrochemical performance of SnSe is attributed to its highly reversible conversion reaction mechanism than SnSe2.
Yanzhong Wang,Yingchang Cao,Benben Ma,Kelai Xi,Xin Cheng,Mingshui Song 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.3
Facies identification is a fundamental issue on evaluation and prediction for siliciclastic sediments. The purpose of this paper is to identify sedimentary-diagenetic facies and investigate the influence of sedimentary-diagenetic facies on reservoir quality in coarse-grained deposits from the Eocene Es4 interval, Dongying Depression, Bohai Bay Basin. Based on detailed core observation, thin section petrography combined with conventional wireline logs and core measurement analysis, 12 types of sedimentary-diagenetic facies were divided according to their lithofacies, diagenetic products and related contributions to reservoir quality. The identification and spatial distribution of these sedimentary-diagenetic facies can be determined based on the Bayes discriminant analysis and related cross-plot analysis. The variations of porosity and permeability with burial depth were precisely determined with ±2% for porosity and ±1 × 10–3 μm2 for permeability. The spatial distribution of reservoir porosity and permeability can be predicted quantitatively: high zones of porosity and permeability mainly distributed in the central sections of thick-bedded sandbody, ranging from 6% to greater than 12% for reservoir porosity and from 1 × 10–3 μm2 to greater than 6 × 10–3 μm2; relatively low zones of porosity (less than 6%) and permeability (less than 1 × 10–3 μm2) mainly occur in the bottom and the margin of the thick-bedded sandbody.
Yi-Jing Wang,Pan Zhao,Bing-Dong Sui,Nu Liu,Cheng-Hu Hu,Ji Chen,Chen-Xi Zheng,An-Qi Liu,Kun Xuan,Ya-Ping Pan,Yan Jin 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
Mesenchymal stem cell (MSC)-based regeneration, specifically cell aggregate or cell sheet engineering, is a promising approach for tissue reconstruction. Considering the advantages of ease of harvest and lack of immune rejection, the application of autologous MSCs (i.e., patients’ own MSCs) in regenerative medicine has developed considerable interest. However, the impaired cell viability and regenerative potential following MSCs impacted by disease remain a major challenge. Resveratrol (RSV) exhibits reliable and extensive rejuvenative activities that have received increasing clinical attention. Here, we uncovered that resveratrol enhances the functionality and improves the regeneration of mesenchymal stem cell aggregates. Periodontal ligament MSCs (PDLSCs) from normal control subjects (N-PDLSCs) and periodontitis patients (P-PDLSCs) were investigated. Compared to N-PDLSCs, P-PDLSCs were less capable of forming cell aggregates, and P-PDLSC aggregates showed impaired osteogenesis and regeneration. These functional declines could be mimicked in N-PDLSCs by tumor necrosis factor alpha (TNF-α) treatment. Notably, a TNF-α-induced functional decline in N-PDLSC aggregates was rescued by RSV application. More importantly, in both N-PDLSCs and P-PDLSCs, RSV promoted cell aggregate formation and improved their osteogenic potential. Furthermore, as proven ectopically in vivo, the tissue regenerative capability of P-PDLSC aggregates was also enhanced after RSV treatment during aggregate formation in vitro. Finally, in a rat in situ regeneration model, we successfully applied both N-PDLSC aggregates and P-PDLSC aggregates to repair periodontal defects upon long-term functional improvements by RSV preconditioning. Together, our data unravel a novel methodology for using pharmacology (i.e., RSV)-based cell aggregate engineering to improve the functionality and facilitate the regeneration of MSCs from both healthy and inflammatory microenvironments, shedding light on improving the application of autologous MSC-mediated regenerative medicine.