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Fluorescence enhancement of Tb^(3+) complexes by adding silica-coated silver nanoparticles

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Science China Chemistry 2015年第6期58卷 979-985页

作者： dan zhou Xuemei Lin Ailing Wang Jingjing Li Yanrong Qu Haibin Chu Yongliang Zhao College of Chemistry and Chemical Engineering Inner Mongolia University

Six kinds of terbium ternary complexes with halo-benzoic acids were synthesized. Their compositions were determined by C, H elemental analyzer and EDTA titration. The infrared spectra, ultraviolet absorption spectra, and fluorescence spectra were also measured to identify the complexes. Elemental analysis showed that the compositions of these complexes were Tb（p-BrBA）3- H20, Tb（p-CIBA）3- 2H20, Tb（p-FBA）3- H20, Tb（o-FBA）3·2H20, Tb（o-CIBA）3· H20, and Tb（o-BrBA）3. H20, respectively. The monodispersed Ag@SiO2 core-shell nanoparticles with silica thicknesses of 10, 15, and 25 nm were success- fully prepared and characterized by transmission-electron microscopy. Fluorescence intensities of the complexes were detected before and after Ag@SiO2core-shell nanoparticles were added; the enhancement times were related to the silica-shell thick- ness. The fluorescence enhancement times were largest when the thickness of the silica shell was 25 nm. The mechanism may be attributed to the localized surface-plasmon resonance. Furthermore, the enhancement effect of terbium fluoro-benzoate complexes was the strongest in these complexes. This result may be attributed to the hydrogen bond between the hydroxyl on the surface of the silica shell and the fluorine atom.

关键词： Tb3+ complexes halobenzoic acids Ag@SiO2 core-shell nanoparticles metal-enhanced fluorescence

Investigation of nursing students’ knowledge of and attitudes about problem-based learning

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International Journal of Nursing Sciences 2014年第1期1卷 126-129页

作者： Yang Luo dan-dan zhou Ying Luo Yan Song dan Liu School of Nursing Central South UniversityChangshaChina Xiangya Hospital Central South UniversityChangshaChina

Purpose:To investigate nursing students’knowledge of and attitudes about problem-based learning(PBL).Methods:A total of 1200 students were surveyed at eight nursing colleges in Hunan ***:In all,1037 valid questionnaires were returned,for an effective return rate of 86.4%.Some 54.4%of the students learned that PBL was a pedagogical method from teachers,and 27.8%of the students had participated in PBL *** all of students(97.6%)were interested in PBL,and 66.7%of survey participants believed that students who were not good at solving problems would have difficulty in PBL ***:Nursing educators should guide students to adapt to new learning approaches,and encourage students to participate in the teaching reform to promote students’autonomous learning ability,innovation ability,and comprehensive ability.

关键词： Cognition Education nursing Problem-based learning

Effect of cement on the stabilization of loess

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Journal of Mountain Science 2017年第11期14卷 2325-2336页

作者： ZHANG Chong-lei JIANG Guan-lu SU Li-jun zhou Gong-dan Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and Environment Chinese Academy of Sciences Key Laboratory of High-speed Railway Engineering of Ministry of Education School of Civil Engineering Southwest Jiaotong University CAS Center for Excellence in Tibetan Plateau Earth Sciences University of Chinese Academy of Sciences

Considering the potential use of cementstabilized loess(CSL) as a construction material for structures that are subjected to frequent loess landslides, this paper explores the stabilization and improvement of geotechnical characteristics of loess achieved by the addition of 0%-9% cement by dry weight. Laboratory evaluations investigated the consistency limits, compaction, compressibility, California bearing ratio(CBR), direct shear strength, and unconfined compression strength(UCS) of CSL for different curing stages. A durability index was quantified to estimate the influence of wetting-drying(w-d) cycles on CSL strength, and an optimum cement dosage was also identified. The results reveal that the cohesion of CSL is substantially more sensitive to structure than its friction angle and that cohesion is responsible for shear strength increase after remoulding. The cement proportions have an effective role in the enhancement of compressibility. The development of UCS can be categorized into the early stage(14 days). The increase in strength primarily occurred in the first 14 days. The w-d cycles have a significantinfluence on the decrease in compression strength. The CBR value increases with increments of additional proportions and compaction times. The relationships of UCS versus the compressibility modulus and UCS versus CBR are established to facilitate the mix design for strength. A rational predictive exponential equation is proposed to predict the durability index for different w-d cycles.

关键词： Landslide Cement Loess stabilization Durability index Wetting-drying cycle

Neuroprotective effect of epigallocatechin-3-gallate on hemisection-induced spinal cord injury in rats

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Neural Regeneration Research 2011年第6期6卷 405-411页

作者： Fengjun Deng Rubing Li Yingbao Yang dan zhou Qian Wang Jiangping Xu Department of Pharmaceutical Sciences Hunan Yiyang Medical College Yiyang 413000 Hunan Province China Pharmaceutical Preparation Section General Hospital of Guangzhou Military Command of PLA Guangzhou 510010 Guangdong Province China Department of Pharmacology School of Pharmaceutical Sciences Southern Medical University Guangzhou 510515 Guangdong Province China Pingxiang Healthy School Pingxiang 337000 Jiangxi Province China

Epigallocatechin-3-gallate （EGCG）, a naturally occurring compound in green tea, has been widely used as an antioxidant agent. In the present study, model rats with acute spinal cord injury were intraperitoneally injected with 25, 50, and 100 mg/kg EGCG, and spinal cord ultrastructure, oxidative stress reaction, inflammatory factors, and apoptosis-associated gene expression were observed. Results showed that EGCG attenuated neuronal and axonal injury 24 hours post injury. It also decreased serum intedeukin-113, tumor necrosis factor-a, and intercellular adhesion molecule-1 release, and decreased apoptosis-associated gene expression. Furthermore, it increased the level of the superoxide anion （O2-）, superoxide dismutase, and B-cell lymphoma/leukemia-2, and reduced malondialdehyde levels. Furthermore, it reduced the expression of the pro-apoptotic protein Bax. Noticeably, EGCG at the 100 mg/kg dosage exhibited similar effects as methylprednisolone sodium succinate, which has been frequently used for clinical acute spinal cord injury. The results demonstrated that EGCG can significantly inhibit inflammation, suppress oxidation, and reduce apoptosis in acute spinal cord injury.

关键词： epigallocatechin-3-gallate spinal cord injury neuroprotective effect oxidative stress inflammation apoptosis

Characterization of docking and fusion of synaptic-like microvesicles in PC12 cells using TIRFM

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Chinese Science Bulletin 2007年第22期52卷 3089-3096页

作者： zhou Wei ZHU dan LIANG Tao LI ChenHong WU ZhengXing Key Laboratory of Molecular Biophysics/Ministry of Education and Joint Laboratory of Institute of Biophysics Huazhong University of Science and Technology Wuhan 430074 China

Neurotransmitters are released by the fusion of synaptic vesicles with presynaptic membrane,which has been extensively studied. The analysis of single vesicle fusion kinetics reveals that there exist fusion modes of "kiss and run" and "kiss and stay" which may be favored by neurons especially during strong firing beside full fusion. Pre-fusion steps of translocation,docking and priming along the exo-cytotic pathway play important roles in neurotransmitter release and its regulation. In the present report,we used dual-color imaging of VAMP2-pHluorin and VAChT-TDimer2 under total internal reflection fluorescence microscope(TIRFM) to monitor the docking and fusion of synaptic-like microvesicles(SLMVs) in PC12 cells stimulated by high K+. Our results show that "kiss and run" is a dominative fu-sion mode in PC12 cells under high K+-challenge,and the dwell time of SLMVs is prolonged by the high K+ stimulation that suggests an enhancement of vesicle priming.

关键词： PC12细胞微泡分析方法神经传递素

Excellent effects and possible mechanisms of action of a new antibody–drug conjugate against EGFR-positive triple-negative breast cancer

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Military Medical Research 2022年第4期9卷 419-431页

作者： dan-dan zhou Wei-Qi Bai Xiao-Tian Zhai Li-Ping Sun Yong-Su Zhen Zhuo-Rong Li Qing-Fang Miao NHC Key Laboratory of Biotechnology of Antibiotics Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences and Peking Union Medical CollegeNo.1 Tiantan XilBeijing 100050China Department of Organic Chemistry Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences and Peking Union Medical CollegeNo.1 Tiantan XiliBeijing 100050China

Background:Triple-negative breast cancer(TNBC)is the most aggressive subtype and occurs in approximately 15%–20%of diagnosed breast *** is characterized by its highly metastatic and recurrent features,as well as a lack of specific targets and targeted *** growth factor receptor(EGFR)is highly expressed in a variety of tumors,especially in ***004-VC-MMAE is a new EGFR-targeting antibody–drug conjugate produced by our *** study aimed to evaluate its antitumor activities against EGFR-positive TNBC and further studied its possible mechanism of antitumor ***:LR004-VC-MMAE was prepared by coupling a cytotoxic payload(MMAE)to an anti-EGFR antibody(LR004)via a linker,and the drug-to-antibody ratio(DAR)was analyzed by *** gene expression of EGFR in a series of breast cancer cell lines was assessed using a publicly available microarray dataset(GSE41313)and Western ***-MB-468 and MDA-MB-231 cells were treated with LR004-VC-MMAE(0,0.0066,0.066,0.66,6.6 nmol/L),and the inhibitory effects of LR004-VC-MMAE on cell proliferation were examined by CCK-8 and colony *** migration and invasion capacity of MDA-MB-468 and MDA-MB-231 cells were tested at different LR004-VCMMAE concentrations(2.5 and 5 nmol/L)with wound healing and Transwell invasion *** cytometric analysis and tumorsphere-forming assays were used to detect the killing effects of LR004-VC-MMAE on cancer stem cells(MDA-MB-468 and MDA-MB-231 cells).The mouse xenograft models were also used to evaluate the antitumor efficacy of LR004-VC-MMAE in ***,BALB/c nude mice were subcutaneously inoculated with MDA-MB-468 or MDAMB-231 *** they were randomly divided into 4 groups(n=6 per group)and treated with PBS,naked LR004(10 mg/kg),LR004-VC-MMAE(10 mg/kg),or doxorubicin,*** sizes and the body weights of mice were measured every 4 *** effects of LR004-VC-MMAE on apoptosis and cell cycle distribution were analyzed

关键词： Triple-negative breast cancer Epidermal growth factor receptor Antibody–drug conjugate Targeted therapy Antitumor effect

Inhibiting MMP13 Attenuates Deep Vein Thrombosis in a Mouse Model by Reducing the Expression of Pdpn

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Current Medical Science 2024年第2期44卷 369-379页

作者： Ji LUO Jin zhou Jing-zeng LUO Hai-long WANG Xue-ling ZHAO Ru-dan zhou Department of Intensive Care Unit The First People's Hospital of ZiyangZiyang 641300China Department of Orthopedics Kunming Medical University Second Affiliated HospitalKunming 650033China Department of Orthopedics Kunming Medical University First Affiliated HospitalKunming 650032China Department of Orthopedics The Third People's Hospital of Yunnan ProvinceKunming 650200China

Objective:Matrix metalloproteinase 13(MMP13)is an extracellular matrix protease that affects the progression of atherosclerotic plaques and arterial thrombi by degrading collagens,modifying protein structures and regulating inflammatory responses,but its role in deep vein thrombosis(DVT)has not been *** purpose of this study was to investigate the potential effects of MMP13 and MMP13-related genes on the formation of ***:We altered the expression level of MMP13 in vivo and conducted a transcriptome study to examine the expression and relationship between MMP13 and MMP13-related genes in a mouse model of *** screening genes possibly related to MMP13 in DVT mice,the expression levels of candidate genes in human umbilical vein endothelial cells(HUVECs)and the venous wall were *** effect of MMP13 on platelet aggregation in HUVECs was investigated in ***:Among the differentially expressed genes,interleukin 1 beta,podoplanin(Pdpn),and factor VIII von Willebrand factor(F8VWF)were selected for analysis in *** MMP13 was inhibited,the expression level of PDPN decreased significantly in *** HUVECs,overexpression of MMP13 led to an increase in the expression level of PDPN and induced platelet aggregation,while transfection of PDPN-siRNA weakened the ability of MMP13 to increase platelet ***:Inhibiting the expression of MMP13 could reduce the burden of DVT in *** mechanism involves downregulating the expression of Pdpn through MMP13,which could provide a novel gene target for DVT diagnosis and treatment.

关键词： deep vein thrombosis matrix metalloproteinase 13 podoplanin

EBNA3C combines with Gemin3 and up-regulates its expression

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中国现代医学杂志 2011年第6期21卷 697-708页

作者： Qian Wang dan zhou Yi Guo Department of Laboratory Medicine the First Affiliated Hospital China Medical University Shenyang Liaoning 110001 P.R.China Department of Obstetrics and Gynecology Dashiqiao Municipal Central Hospital Dashiqiao Liaoning 115100 P.R.China Department of Gynecology the First Affiliated Hospital China Medical University Shenyang Liaoning 110001 P.R.China

Objective To investigate the combination of Epstein-Barr virus nuclear protein 3C (EBNA3C) with Gemin3 and its effect on Gemin3 expression. Methods Co-immunoprecipitation, GST pull-down and immunofluorescent assay were used to determine the combination of EBNA3C and Gemin3 and their combining domain. Stable EBNA3C knockdown cell lines were made by lentivirus-delivered small hairpin RNA and then puromycin selection. Western blot was used to check the effect of EBNA3C on Gemin3 expression. Results EBNA3C and Gemin3 combined with each other in vivo and in vitro through their C-terminals. EBNA3C up-regulated Gemin3 gene expression. Conclusion EBNA3C forms complex with Gemin3 and up-regulates its expression.

关键词： EBNA3C Gemin3 gene expression regulation gene knock down

Synthesis and Phase Behavior of Poly(1-alkyne) with Liquid Crystalline-induced Luminescence Enhancement

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Chemical Research in Chinese Universities 2010年第6期26卷 1035-1044页

作者： zhou dan CHEN Yi-wang CHEN Lie LI Fan NIE Hua-rong YAO Kai Institute of Polymers Department of Chemistry Nanchang University Nanchang 330031 P. R. China

Poly（1-alkyne） with octoxy spacer —{[HC=C（CH2）8O—terphenyl—CN]}n—（PA8CN） and terphenyl liquid crystalline pendant was synthesized,and the effects of structure on the optical properties,especially the liquid crystallinity behavior of the polymer and monomer were *** monomer was prepared in high yields（92.30%） by coupling and etherification reactions and successfully polymerized in the presence of Rh catalyst and Et3N cocatalyst in high yields with trans-rich（86.27%） stereoregular *** to the monomer showing mixed monolayer structure,its corresponding polymer PA8CN formed homogeneous monolayer *** photoexcitation,strong blue emission peak of PA8CN appeared at 413 nm[fluorescence quantum yield,ΦF = 68% when excited at 330 nm in tetrahydrofuran（THF） solution].Compared with its solid film photoexcitated at 330 nm at room temperature,the UV light-emitting band of PA8CN solid film from its liquid crystalline with liquid nitrogen quenched rapidly at 236 ℃ was red-shift 10 nm with higher intensity,which may be ascribed to the fact that the effectual conjugation and the order degree of the molecule in the liquid crystalline state of the polymer were enhanced,the energy loss caused by the thermal vibration was decreased,thus resulting in the observed hyperchromic effect.

关键词： Polyacetylene Liquid crystallinity Phase transition Photoluminescence