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Wang Wei,Liang Xuanyu,Niu Qinghe,Wang Qizhi,Zhuo Jinyi,Su Xuebin,Zhou Genmao,Zhao Lixin,Yuan Wei,Chang Jiangfang,Zheng Yongxiang,Pan Jienan,Wang Zhenzhi,Ji Zhongmin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8
It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method was established by the analytic hierarchy process-entropy weight method (AHP-EWM) and the fuzzy mathematics method. Finally, evaluation results were verified by the split Hopkinson Pressure Bar (SHPB) experiment and permeability test. Results show that medium sandstone, argillaceous sandstone and siltstone exhibit excellent reformability, followed by coarse sandstone and fine sandstone, while the reformability of sandy mudstone is poor and is not able to accept BEP reservoir stimulation. The permeability improvement and the distribution of damage fractures before and after the SHPB experiment confirm the correctness of evaluation results. This research provides a reformability evaluation method for the BEP of the low-permeability sandstone-type uranium deposit, which contributes to the selection of the appropriate regional and stratigraphic horizon of the BEP and the enhanced ISL of the low-permeability sandstone-type uranium deposit.
Zhuo Wang,Xiaoxv Gao,Wenfeng Li,Si Tan,Qiaoran Zheng 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.5
The aim of this study was to compare the phenoliccompound profiles and antioxidant capacities of eightvarieties of longan (Dimocarpus longan Lour.) planted inthe middle and upper Yangtze River area. The totalpolyphenols content (TPC) and total flavonoids content(TFC) of dried longan pulp ranged from 1.07 ± 0.05 to1.22 ± 0.05 mg gallic acid equivalents/g and 0.25 ± 0.07to 0.87 ± 0.14 mg rutin equivalents/g. UHPLC-QqQ-MS/MS analysis revealed 12 individual polyphenol compoundsin longan. The Fuwan8, Dongliang and FD97 varietiesshowed the strongest DPPH scavenging activity (IC50 of1.03 g/mL). The highest ABTS? scavenging activity wasfound in the Dongliang. In the enzyme assays, the Fuwan8and Dongliang varieties demonstrated maximum a-amylaseand a-glucosidase inhibition activities, with values of97.56 and 88.58%, respectively. The principal componentanalysis indicated that the Rongyu8 and Songfengbencultivars have nearly analogous polyphenol compounds.
Protective Effects of Verapamil against H2O2-Induced Apoptosis in Human Lens Epithelial Cells
( Zhuo Wang ),( Dan Wang ),( Yan Li ),( Xiuli Zhang ) 한국응용약물학회 2014 Biomolecules & Therapeutics(구 응용약물학회지) Vol.22 No.6
Verapamil is used in the treatment of hypertension, angina pectoris, and atrial fibrillation. Recently, several studies have demonstrated that verapamil increased the optic nerve head blood flow and improved the retrobulbar circulation. All these show that verapamil is potentially useful for ophthalmic treatment. Thus, the aim of this study is to investigate whether verapamil could protect human lens epithelial cell (HLEC) from oxidative stress induced by H2O2 and the cellular mechanism underlying this protective function. The viability of HLEC was determined by the MTT assay and apoptotic cell death was analyzed by Hoechst 33258 staining. Moreover, Caspase-3 expression was detected by immunocytochemistry and flow cytometry analysis. We also detected Caspase-3 mRNA expression by reverse-transcription-polymerase chain reaction and the GSH content in cell culture. The results showed that oxidative stress produced significant cell apoptotic death and it was reduced by previous treatment with the verapamil. Verapamil was effective in reducing HLEC death mainly through reducing the expression level of apoptosis-related proteins, caspase-3, and increasing glutathione content. Therefore, it was suggested that verapamil was effective in reducing HLEC apoptosis induced by H2O2.
ZntR positively regulates T6SS4 expression in Yersinia pseudotuberculosis
Tietao Wang,Keqi Chen,Fen Gao,Yiwen Kang,Muhammad Tausif Chaudhry,Zhuo Wang,Yao Wang,Xihui Shen 한국미생물학회 2017 The journal of microbiology Vol.55 No.6
The type VI secretion system (T6SS) is a widespread and versatile protein secretion system found in most Gram- negative bacteria. Studies of T6SS have mainly focused on its role in virulence toward host cells and inter-bacterial inter-actions, but studies have also shown that T6SS4 in Yersinia pseudotuberculosis participates in the acquisition of zinc ions to alleviate the accumulation of hydroxyl radicals induced by multiple stressors. Here, by comparing the gene expression patterns of wild-type and zntR mutant Y. pseudotubercu-losis cells using RNA-seq analysis, T6SS4 and 17 other bio-logical processes were found to be regulated by ZntR. T6SS4 was positively regulated by ZntR in Y. pseudotuberculosis, and further investigation demonstrated that ZntR regulates T6SS4 by directly binding to its promoter region. T6SS4 ex-pression is regulated by zinc via ZntR, which maintains in-tracellular zinc homeostasis and controls the concentration of reactive oxygen species to prevent bacterial death under oxidative stress. This study provides new insights into the regulation of T6SS4 by a zinc-dependent transcriptional regu-lator, and it provides a foundation for further investigation of the mechanism of zinc transport by T6SS.
Advances of Cancer Therapy by Nanotechnology
Xu Wang,Yiqing Wang,Zhuo (Georgia) Chen,Dong M. Shin 대한암학회 2009 Cancer Research and Treatment Vol.41 No.1
Recent developments in nanotechnology offer researchers opportunities to significantly transform cancer therapeutics. This technology has enabled the manipulation of the biological and physicochemical properties of nanomaterials to facilitate more efficient drug targeting and delivery. Clinical investigations suggest that therapeutic nanoparticles can enhance efficacy and reduced side effects compared with conventional cancer therapeutic drugs. Encouraged by rapid and promising progress in cancer nanotechnology, researchers continue to develop novel and efficacious nanoparticles for drug delivery. The use of therapeutic nanoparticles as unique drug delivery systems will be a significant addition to current cancer therapeutics.
Huaxin Wang,Xuan Peng,Yayi Huang,Yeda Xiao,Zhuo Wang,Liying Zhan 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.12
Purpose: The aim of this study was to investigate whether propofol could attenuate hypoxia/reoxygenation-induced apoptosisand autophagy in human renal proximal tubular cells (HK-2) by inhibiting JNK activation. Materials and Methods: HK-2 cells were treated with or without propofol or JNK inhibitor SP600125 for 1 hour and then subjectedto 15 hours of hypoxia and 2 hours of reoxygenation (H/R). Cell viability and LDH release were measured with commercial kits. Cell apoptosis was evaluated by flow cytometry. The expressions of p-JNK, cleaved-caspase-3, Bcl-2, and autophagy markers LC3and p62 were measured by Western blot or immunofluorescence. Results: HK-2 cells exposed to H/R insult showed higher cell injury (detected by increased LDH release and decreased cell viability),increased cell apoptosis index and expression of cleaved-caspase-3, a decrease in the expression of Bcl-2 accompanied byincreased expression of p-JNK and LC3II, and a decrease in expression of p62. All of these alterations were attenuated by propofoltreatment. Similar effects were provoked upon treatment with the JNK inhibitor SP600125. Moreover, the protective effects weremore obvious with the combination of propofol and SP600125. Conclusion: These results suggest that propofol could attenuate hypoxia/reoxygenation induced apoptosis and autophagy inHK-2 cells, probably through inhibiting JNK activation.
Xia Wang,Changcun Wu,Jun Sun,Chuanxiang Qin,Jianjun Wang,Qiqi Zhuo,Lixing Dai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
This study introduces a facile method to prepare syndiotactic poly(vinyl alcohol) (s-PVA) fibers containing singlewalledcarbon nanotubes (SWNTs) from the corresponding composite dispersions with tea polyphenols (TP) as dispersantunder high-speed shear flow. The formation of the composite fibrous precipitates at high shear rate is largely facilitated by theSWNTs in the dispersions and slight flow resistance. Interestingly, the obtained s-PVA/SWNTs composite precipitatespossess a three-level hierarchical structure, that is, a single fiber is assembled by fibrils which are composed of microfibrils ofs-PVA-coated SWNTs. And the s-PVA fibrous precipitates containing high amounts of SWNTs could be obtained by shearingthe dispersion with relatively low SWNTs loadings, as a result, the composite fiber containing 20.7 wt% SWNTs wasprepared from the dispersion with 10.0 wt% SWNTs. In addition, with the increase of SWNTs loadings, the amount of theprecipitates increases, but crystallinity of the precipitates decreases instead.