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Induction of apoptosis in HT-29 cells by quercetin through mitochondria-mediated apoptotic pathway
Zhaohui Li,Quanxin Gao 한국통합생물학회 2013 Animal cells and systems Vol.17 No.3
With increasing use of natural plant-derived components, exploring the anti-proliferative effects of phytochemicals is increasingly gaining importance in designing anticancer drugs. Quercetin, a natural constituent abundantly present in food products, is capable of inducing apoptosis in tumor cells. However, little is known about its biological effect on colon cancer cells and molecular mechanism leading to this event. The aim of this study was to investigate the effect of quercetin on the apoptotic pathway in human colon carcinoma cells (HT-29 cells). The results indicated that quercetin induced suppression of cell viability and apoptosis in HT-29 cells in a dose-dependent manner. This involved characteristic changes in nuclear morphology, activation of caspases-3 and caspases-9, collapse of Mitochondrial membrane potential (DCm), upregulation of pro-apoptotic Bax, and downregulation of antiapoptotic Bcl-2 and Bcl-XL. Quercetin, which exerts anti-proliferative effect though different signaling pathways, is a classic candidate for anti-colon cancer drug design.
Junjing Li,Bo Li,Jiejing Li,Junliang Liu,Liang Wang,Hongwei Zhang,Zhaohui Zhang,Bin Zhao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
In this study, La, N codoped TiO2 (La–N–TiO2) nano-photocatalyst was fabricated through simple sol–gel method. The resulting samples were characterized through X-ray diffraction (XRD), scanning electrons microscope (SEM), transmission electrons microscope (TEM), X-ray photoelectron spectroscopy (XPS) and UV–visible light diffuse reflection spectroscopy (UV–vis DRS). Results revealed that La elements were not implanted into the structure of TiO2 but existed as the form of Ti–O–La bonds in the interstitial site, while N dopants were incorporated into the lattice of TiO2 and coexisted in the substitutional N (N– Ti–O) and interstitial N (Ti–O–N) in the La–N–TiO2 catalyst, thereby resulting in the formation of new impurity energy level between the forbidden band and greatly enhancement of light absorption ability in visible light region. The enhanced visible light driven (VLD) photocatalytic (PC) performance for the degradation of phenol aqueous solution could be attributed to the intense light absorbance in visible light region and high separation efficiency of photogenerated charge carriers.
Approximation of Common Fixed Points of Mean Non-expansive Mapping in Banach Spaces
Gu, Zhaohui,Li, Yongjin Department of Mathematics 2014 Kyungpook mathematical journal Vol.54 No.1
Let X be a uniformly convex Banach space, and S, T be pair of mean nonexpansive mappings. Some necessary and sufficient conditions are given for Ishikawa iterative sequence converge to common fixed points, and we prove that the sequence of Ishikawa iterations associated with S and T converges to the common fixed point of S and T. This generalizes former results proved by Z. Gu and Y. Li [4].
Zhaoyi Li,Liang Sun,Zhongjun Fu,Yuchao Li,Zhaohui Jiang,Bingtao Tang,Quan Ji,Yanzhi Xia,Ming Wang,Haofei Huang 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Calcium alginate fiber is a biomaterial with promising application in textile industry. However, the poor dyeingproperty of this fiber restricts its development. In this study, three PVAm (polyvinylamine) dyes were applied to the exhaustdyeing of calcium alginate fiber and their dyeing behavior under different dyeing conditions was studied. The dyeing resultsrevealed that PVAm dyes were firmly adsorbed on calcium alginate fiber by coordination bonding formed between theprimary amino groups in PVAm backbones of dyes and Ca2+ ions in calcium alginate fiber. This special complex dyeingmode was further confirmed by a Langmuir-type adsorption manner of PVAm-1 dye for calcium alginate fiber. By theformation of this stable chelation structure between dyes and fibers, high exhaustion rates (88.9-97.1 %) and excellent colorfastness were obtained. SEM and XRD results also showed that the surface and crystal phase of dyed fibers had very slightchanges compared to those of original calcium alginate fibers. The strength property of the fiber was also maintained wellafter this special complex dyeing process.
Liu Jiansheng,Li Jiajia,Zhang Shu,Ding Mengbin,Yu Ningyue,Li Jingchao,Wang Xiuhui,Li Zhaohui 나노기술연구협의회 2022 Nano Convergence Vol.9 No.13
Infrared neural stimulation with the assistance of photothermal transducers holds great promise as a mini-invasive neural modulation modality. Optical nanoparticles with the absorption in the near-infrared (NIR) window have emerged as excellent photothermal transducers due to their good biocompatibility, surface modifiability, and tunable optical absorption. However, poor activation efficiency and limited stimulation depth are main predicaments encountered in the neural stimulation mediated by these nanoparticles. In this study, we prepared a targeted polydopamine (PDA)-coated gold (Au) nanoparticles with specific binding to thermo-sensitive ion channel as nanotransducers for second near-infrared (NIR-II) photo-stimulation of neurons in rats. The targeted Au nanoparticles were constructed via conjugation of anti-TRPV1 antibody with PEGylated PDA-coated Au nanoparticles and thus exhibited potent photothermal performance property in the second NIR (NIR-II) window and converted NIR-II light to heat to rapidly activate Ca 2+ influx of neurons in vitro. Furthermore, wireless photothermal stimulation of neurons in living rat successfully evoke excitation in neurons in the targeted brain region as deep as 5 mm beneath cortex. This study thus demonstrates a remote-controlled strategy for neuromodulation using photothermal nanotransducers.
Influence of Structural Parameters and Tolerance on Stiffness of High-Speed Ball Bearings
Zhaohui Yang,Baotong Li,Tianxiang Yu 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
High-speed ball bearings are widely used in aerospace, high-speed machining tool and other complex mechanical systems. And the stiffness is one of most critical parameter of bearings to decide the machine performance. This paper attempts to construct a 5-DOF stiffness matrix based on quasi-dynamic model of high-speed ball bearings to analyze the variation of stiffness with different work condition precisely, and the variation of stiffness with structural parameter and manufacturing errors are calculated for the optimization of tolerance. In this method, the effect of combined loads and lubrication effect are considered, which can achieve high precision analysis of the relationship between contact load and displacement. And then a 5-DOF stiffness matrix can be calculated precisely. The results can be used to optimize the design bearing for improving stiffness.