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45篇 您的检索式:作者名="Dao Yan"
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1Status and distribution changes of the endangered Green Peafowl (Pavo muticus) in China over the past three decades (1990s-2017)显示文摘Background: Understanding the changes in population dynamics, including demographics, distribution and threats, is essential for species status assessing. The endangered Green Peafowl(Pavo muticus) has experienced sharp population declines and distribution range diminishing both in China and Southeast Asia. Field population surveys have not been conducted in China since the 1990 s, which hindered conservation planning and decision-making.Methods: With interview and line transects methods, we figured out the population and distribution changes of Green Peafowl across its historical ranges over the past three decades in China during 2014-2017.Results: The Green Peafowl once habituated in 54 counties in China. Nearly 60% of the distribution counties were lost in the past three decades, with the left 22 counties distributed in central, southern and western Yunnan, SW China. Population decrease detected in all distribution areas except for Shuangbai and Xinping county where more than 60% of the total population is located. Only about 30% of the former bird population were recorded with the same interviewing method as 20 years ago. Three birds, 1 carcass, 6 calls and 12 footprints were detected along the 865 km line transects, indic-ating extremely low encounter rate of Green Peafowl in field. Sharp decreases in flock sizes were also detected, from 820 birds per flock in the 1990 s to 3-5 birds at present. Poaching and habitat conversion are two widespread and long-lasting threats, while poisoning caused mortality in the past and hydropower construction affect regional population's survival. Large flocks of 18–27 birds were discovered in the field, which increases our confidence of population recovery of this endangered pheasant in China.Conclusions: Only interviewed bird number and counts based on line transects were presented in this study, without further population estimation due to limitation of the data sets. Although the actual population of this cryptic bird must be underestimated, dramatic population declines and distribution concentrations of the endangered Green Peafowl occurred over the past 30 years in China undoubtedly.Dejun Kong Fei Wu Pengfei Shan Jianyun Gao Dao Yan Weixiong Luo Xiaojun Yang 2018Avian Research2018,9,2:12
2CeCl_3·7H_2O as an efficient catalyst for one-pot synthesis of β-amino ketones by three-component Mannich reaction显示文摘Cerium trichloride heptahydrate(CeCl_3·7H_2O) was found to be an efficient and recyclable catalyst for the three-component direct Mannich reaction of anilines and benzaldehydes with acetophenone.This protocol has advantages of high yield,no environmental pollution,mild condition,and simple work-up procedure.Yan Dai Chun Xu Lü 2010Chinese Chemical Letters2010,21,1:10
3A mimotope of Pre-S_2 region of surface antigen of viral hepatitis B screened by phage display显示文摘To acquire the phage-displayed mimotopes which mimic the specificity of hepatitis B virus surface antigen (HBsAg), a random peptide library expressing linear peptide with 12 amino asids in length were used to screen with the serum from a hepatitis B virus infected patient in the recovery phase. After 3 rounds of biopanning, the positive phages were confirmed by competitive ELISA using HBsAg/P33. Two phagotopes were identified and one of them was confirmed as mimotope by competition experiment. Based on the mimotpe, a multiple antigenic peptide with four branches was synthesized by solid phase peptide synthesis. The antiginicity and specificity of the synthesized antigen was tested in BALB/c mice compared with the native epitope-based antigen. The results showed that the mimotope-based antigen could evoke higher titer of antibodies with the same specificity of the epitope-based antigen. Those findings indicate mimotopes can be used in antigen and vaccine design.WU YU ZHANG, YING WAN, DAO GUO LI, YAN TANG, WEI ZHOU Institute of Immunology, PLA, The Third Medical University, Chongqing 400038, China Medical Center, General Hospital of Weifang, Weifang 26100, China 2001Cell Research2001,11,3:7
4The double face of miR-320:cardiomyocytes-derived miR-320 deteriorated while fibroblasts-derived miR-320 protected against heart failure induced by transverse aortic constriction显示文摘MicroRNAs(miRNAs)are aberrantly expressed in the pathophysiologic process of heart failure(HF).However,the functions of a certain miRNA in different cardiac cell types during HF are scarcely reported,which might be covered by the globe effects of it on the heart.In the current study,Langendorff system was applied to isolate card io myocytes(CMs)and cardiac fibroblasts(CFs)from transverse aortic constriction(TAC)-induced mice.Slight increase of miR-320 expression was observed in the whole heart tissue of TAC mice.Interestingly,miR-320 was significantly elevated in CMs but decreased in CFs from TAC mice at different time points.Then,recombinant adeno-associated virus 9 with cell-type-specific promoters were used to manipulate miR-320 expressions in vivo.Both in vitro and in vivo experiments showed the miR-320 overexpression in CMs exacerbated cardiac dysfunction,whereas overexpression of miR-320 in CFs alleviated cardiac fibrosis and hypertrophy.Mechanically,downstream signaling pathway analyses revealed that miR-320 might induce various effects via targeting PLEKHM3 and IFITM1 in CMs and CFs,respectively.Moreover,miR-320 mediated effects could be abolished by PLEKHM3 re-expression in CMs or IFITM1 re-expression in CFs.Interestingly,miR-320 treated CFs were able to indirectly affect CMs function,but not vice versa.Meanwhile,upstream signaling pathway analyses showed that miR-320 expression and decay rate were rigorously manipulated by Ago2,which was regulated by a cluster of cell-type-specific TFs distinctively expressed in CMs and CFs,respectively.Together,we demonstrated that miR-320 functioned differently in various cell types of the heart during the progression of HF.Xudong Zhang Shuai Yuan Huaping Li Jiabing Zhan Feng Wang Jiahui Fan Xiang Nie Yan Wang Zheng Wen Yanghui Chen Chen Chen Dao Wen Wang 2021Signal Transduction and Targeted Therapy2021,6,3:4
5Long-term modifications of blood pressure in normotensive and spontane-ously hypertensive rats by gene delivery of rAAV-mediated cytochrome P450 arachidonic acid hydroxylase显示文摘Arachidonic acid cytochrome P-450 (CYP) hydroxylase 4A isoforms, including 4A1, 4A2, 4A3 and 4A8 in the rat kidney, catalyze arachidonic acid to produce 19/20-Hydroxyeicosatetraenoic acids (20-HETE), a biologically active metabolite, which plays an important role in the regulation of blood pressure. However, controversial results have been reported regarding the exact role of 20-HETE on blood pressure. In the present study, we used recombinant adeno- associated viral vector (rAAV) to deliver CYP 4A1 cDNA and antisense 4A1 cDNA into Sprague-Dawley (SD) rats and spontaneously hypertensive rats (SHR), respectively, to investigate the effects of long-term modifications of blood pressure and the potential for gene therapy of hypertension. The mean systolic pressure increased by 14.2±2.5 mm Hg in rAAV·4A1-treated SD rats and decreased by 13.7±2.2 mm Hg in rAAV·anti4A1-treated SHR rats 5 weeks after the injection compared with controls and these changes in blood pressure were maintained until the experiments ended at 24 weeks. In 4A1 treated animals CYP4A was overexpressed in various tissues, but preferentially in the kidney at both mRNA and protein levels. In anti-4A1-treated SHR, CYP4A mRNA in various tissues was probed, especially in kidneys, but 4A1 protein expression was almost completely inhibited. These results suggest that arachidonic acid CYP hydroxy- lases contribute not only to the maintenance of normal blood pressure but also to the development of hypertension. rAAV-mediated anti4A administration strategy has the potential to be used as targeted gene therapy in human hyperten- sion by blocking expression of CYP 4A in kidneys.Fan ZHANG Chun Lian CHEN Jia Qing QIAN Jiang Tao YAN Katherine CIANFLONE Xiao XIAO Dao Wen WANG 2005Cell Research2005,15,9:3
6A method for computing unsupported roof distance in roadway advancement and its in-situ application显示文摘A reasonable unsupported roof distance(URD) when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development.A mechanical model of the roof,using the relationship between the roof stress distribution and URD,obtained by the difference method,and roof stability according to the in-situ roof stress and rock mass strength was developed.We subsequently designed a proper range of URD,developed a testing method of URD with the function of mining protection,evaluated roof stability through analyzing the test data and then determined a reasonable URD.Considering the factors of the geological conditions,the immediate roof stability and the efficiency of the labor arrangement system,the URD of the advancing roadway of 9802 working face in Zhangshuanglou coal mine was determined to be 6 m using the proposed method.The results show that,when a 2 m length of roadway was reinforced by temporary support and high pre-stressed bolt support after the roadway advancement of 6 m per cycle,the speed and the security of the roadway development can be achieved and the advance rate can reach more than 400 m per month.Chen Yong Bai Jianbiao Yan Shuai Hao Shengpeng Dao Viet Doan 2016International Journal of Mining Science and Technology2016,26,4:2
7Effect of 1,25-Dihydroxyvitamin D_3 on Regulatory T Cells in Ovariectomized Mice显示文摘Objective To investigate the correlation between regulatory T(Treg) cells and postmenopausal osteoporosis and the antiosteoporotic effect of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] in relation to Treg cells. Methods Fifty female BALB/c mice were randomly divided into five groups: the basal control(BAS), Sham, ovariectomy(OVX), OVX+diethylstilbestrol(OVX+DES), and OVX+1,25(OH)2D3. Tibias were harvested and processed with decalcification for quantitative bone histomorphometry. Femurs were stained by immunohistochemistry to detect Foxp3 protein expression. Spleens were used to detect Treg and Foxp3 gene expression by flow cytometry and quantitative RT-PCR, respectively. Results In comparison with the Sham group, a significant decrease was found in the OVX group in such indices as trabecular bone volume/total tissue area(BV/TV), trabecular number(Tb.N) and trabecular thickness(Tb.Th). 1,25(OH)2D3 and DES partly prevented the decrease in BV/TV, Tb.N, Tb.Th in OVX mice. Treg cell number, Foxp3 mRNA expression in spleen and Foxp3 protein expression in femur significantly decreased in the OVX-treated group compared with those in the sham group. 1,25(OH)2D3 and DES significantly increased Treg cell number and Foxp3 expression. Treg cells and Foxp3 gene expression were related to bone histomorphometric parameters. Conclusion The decrease in Treg cell numbers is relevant to the postmenopausal osteoporosis. The antiosteoporosis of 1,25(OH)2D3 is related to regulatory T cells.LIU Jun Chen ZHOU Chen Hui ZHANG Xue CHEN Yan XU Bi Lian CUI Liao XU Dao Hua 2014Biomedical and Environmental Sciences2014,27,10:2
8Zeolite-Catalyzed Acetalization Ⅰ. Synthesis of Some Acetals and Ketals through Reaction of Carbonyl Compounds with Ethanediol显示文摘The acetalization of a series of carbonyl compounds with ethanediolwas performed over two self-steaxned HY zeolle catalpsts’ The acetal and ketaiproducts were obtained with high ytelds Espectw, the HY zeollte with highfraxnework Si/A1 ratio was proven to be suitable cataipst for the acetabotion ofunsaturated carbonyl compounds, during which the C =C double bond wasWei JIANG Yan TIAN Yu Dao MA Qi Long WANG(Department of Chemistry, Shandong University, Jinan 250100)Lei WANG(Department of Pharmacy, Shandong Medical University, Jinan, 250012) 1997Chinese Chemical Letters1997,8,5:2
9Anti-complementary effect of polysacchride B3-PS1 in Herba Scutellariae Barbatae ( Scutellaria barbata) 显示文摘Yan W Dao F C 2009Immunopharm Immurtot2009,31,4:1
10Cunninghamia praelanceolata sp. nov. with associated epiphyllous fungi from the upper Miocene of eastern Zhejiang, S.E China and their palaeoecological implications显示文摘Bao-Xia Du De-Fei Yan Bai-Nian Sun Xiang-Chuan Li Ke-Qun Dao Xiao-Qiang Li 2012Review of Palaeobotany and Palynology2012,,:1
11Activation of transient receptor potential vanilloid type - 1 channel prevents adipogenesis and obesity 显示文摘Zhang Li Li Liu Dao Yan Ma Li Qun 2007Circulation Research2007,100,:1
12Polymorphisn of mthionine ynthase gene in nuclear families of congenital heart disease显示文摘Zhu WL Cheng J Dao JJ Zhao RB Yan LY Li SQ 2004Biomed Environ Sci2004,17,1:1
13Enhanced ferroelectric polarization with less wake-up effect and improved endurance of Hf_(0.5)Zr_(0.5)O_(2)thin films by implementing W electrode显示文摘This paper reports the improvement of electrical,ferroelectric and endurance of Hf_(0.5)Zr_(0.5)O_(2)(HZO)thinfilm capacitors by implementing W electrode.The W/HZO/W capacitor shows excellent pristine 2 P_(r)values of 45.1 gC/cm^(2)at±6 V,which are much higher than those of TiN/HZO/W(34.4μC/cm^(2))and W/HZO/TiN(26.9μC/cm^(2))capacitors.Notably,the maximum initial 2 P_(r)value of W/HZO/W capacitor can reach as high as 57.9μC/cm^(2)at±7.5 V.These strong ferroelectric polarization effects are ascribed to the W electrode with a fairly low thermal expansion coefficient which provides a larger in-plane tensile strain compared with TiN electrode,allowing for enhancement of o-phase formation.Moreover,the W/HZO/W capacitor also exhibits higher endurance,smaller wake-up effect(10.1%)and superior fatigue properties up to 1.5×10^(10)cycles compared to the TiN/HZO/W and W/HZO/TiN capacitors.Such improvements of W/HZO/W capacitor are mainly due to the decreased leakage current by more than an order of magnitude compared to the W/HZO/TiN capacitor.These results demonstrate that capping electrode material plays an important role in the enhancement of o-phase formation,reduces oxygen vacancies,mitigates wake-up effect and improves reliability.Dao Wang Yan Zhang Jiali Wang Chunlai Luo Ming Li Wentao Shuai Ruiqiang Tao Zhen Fan Deyang Chen Min Zeng Jiyan Y.Dai Xubing B.Lu J-M.Liu 2022Journal of Materials Science & Technology2022,,9:1
14Activation of transient receptor potential vanilloid type-1 channel prevents adipogenesis and obesity 显示文摘Zhang Li Li Liu Dao Yan Ma Li Qun 2007Circulation Research2007,100,:1
15A novel open-framework gallium phosphate containing two different building units显示文摘Dao F S Rong C Yan Q S 2003Eur J Inorg Chem2003,28,:1
16Direct Enantiomer Separation of 2-PhenylcyclopropanecarboxylateEsters on Cyclodextrin Derivatives Stationary Phases in GC显示文摘Direct enantiomeric separation of all four optical isomers of 2-phenylcyclopropanecarboxylate ester was first achieved on each of the three different β-cyclodextrin chiral stationaryphases (CSPs) in GC. Using these CSPs, enantiomeric excess of the products of enantioselectivecyclopropanation can be determined directly, conveniently and fast.Meng Yan NIE Liang Mo ZHOU Xue Liang LIU Qing Hai WANG Dao Qian ZHU(Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116012) 1999Chinese Chemical Letters1999,10,11:1
17Application of the compatibility theory and the solubility parameter theory in SBS modification asphalt 显示文摘Yang Peng Liu Dao sheng Yan Feng 2002Petroleum Science and Technology2002,20,3:1
18Synthesis and cytotoxic activity of heterocycle-substituted phthalimide derivatives显示文摘一系列代替 heterocycle 的 phthalimide 衍生物被综合。有杂环的戒指的在结构上多样的衍生物包括呋喃, imidazo [ 1,2-a ] pyridine , 1,3,4-thiadiazine , imidazo [ 2,1-b ][ 1,3,4 ] thiadiazine , pyrazole , 1,2,4-triazolo [ 3,4-b ][ 1,3,4 ] thiadiazine , thiazole 和 thiazoline ,被与包含氧,氮和硫原子的各种各样的 nucleophiles 中间的伪- bromoketone 的反应获得。他们的细胞毒素的活动也在 vitro 与五根人的癌症房间线被作比较。Ya Jun Yang Ya Nan Yang Jian Shuang Jiang Zi Ming Feng Hong Yan Liu Xian Dao Pan Pei Cheng Zhang 2010Chinese Chemical Letters2010,21,8:1
19Analysis of Schisandra chinensis and Schisandra sphenanthera显示文摘Yan Lu Dao - Feng Chen 2009Journal of Chrom - atography A2009,1216,:1
20Analysis of Schisandra chinensis and Schisandra sphenanthera显示文摘Yan L Dao F C 2009Journal of Chromatography A2009,1216,:1
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