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Articles by Rui Liu
Total Records ( 4 ) for Rui Liu
  Bin Zhou , Xiao-Lin Yang , Rui Liu and Wei Wei
  In many practical fields, image segmentation is the most important procedure. The purpose of image segmentation is to detect the objects in images. The methods based on statistic theory can work well on images with no noise or little noise. But the procedure of segmentation is difficult to be obtained and the accuracy of result often depends on some artificial parameters. A lot of physical phenomenon can be described by Partial Differential Equations (PDEs) and related procedure is easy to be displayed. With the applications of PDEs, it is convenient to accomplish segmentation and represent the procedure.
  Xiao-Ying Yang , Rui Liu , Tao-yan Dou , Jie Wang , Huai-Zhen He and Wen Lu
  Background and Objective: Imperatorin, isolated from medicinal plant Radix Angelica dahurica, has the same furocoumarin nucleus with psoralen and 8-Methoxypsoralen. The purpose of this study was to investigate the melanocyte activity of imperatorin and its synthetic derivative. Methodology: The effects of imperatorin and its derivative on the activity of tyrosinase and the content of melanin were tested on A375 cells. The possibility of healing vitiligo in Guinea pigs was assessed by using Lillie iron staining, DOPA staining and ELISA assay. Results: Psoralen, 8-Methoxypsoralen, imperatorin and its derivative all increased cellular tyrosinase activity and the contents of melanin in a dose-dependent manner. These four compounds significantly increased the number of melanocyte mm–2 compared with the model control group (p<0.01). The activity of tyrosinase in plasma and cholinesterase in serum were increased contrast to the model control (p<0.01). Conclusion: Imperatorin and its derivative can induce the production of melanocytes in vitiligo animal model, which could be helpful in treating vitiligo and clarifying structure-activity relationship.
  Peng Wu , Yunchang Zhang , Rui Liu , Yi Lv and Xiandeng Hou
  Flame furnace atomic absorption spectrometry (FF-AAS) is a newly developed flame atomic absorption spectrometric technique based on arranging a flame furnace onto the top of the flame burner head. In this fundamental investigation, 25 elements were carefully tested by using either thermospray FF-AAS or tungsten coil electrothermal vaporization FF-AAS, of which 15 volatile and semi-volatile elements (Cd, Tl, Ag, Pb, Zn, Hg, Cu, Sb, Bi, Te, In, As, Se, Sn and Au) exhibited better limits of detection compared to those by conventional FAAS; however, non-volatile or refractory elements (Fe, Co, Ni, Cr, Mn, Pd, Pt, Al, Be and V) showed inferior sensitivities by the proposed methods.
  Xuemin Wang , Bruno D. Fonseca , Hua Tang , Rui Liu , Androulla Elia , Michael J. Clemens , Ulrich-Axel Bommer and Christopher G. Proud
  Signaling through mammalian target of rapamycin complex 1 (mTORC1) is stimulated by amino acids and insulin. Insulin inactivates TSC1/2, the GTPase-activator complex for Rheb, and Rheb·GTP activates mTORC1. It is not clear how amino acids regulate mTORC1. FKBP38 (immunophilin FK506-binding protein, 38 kDa), was recently reported to exert a negative effect on mTORC1 function that is relieved by its binding to Rheb·GTP. We confirm that Rheb binds wild type FKBP38, but inactive Rheb mutants showed contrasting abilities to bind FKBP38. We were unable to observe any regulation of FKBP38/mTOR binding by amino acids or insulin. Furthermore, FKBP38 did not inhibit mTORC1 signaling. The translationally controlled tumor protein (TCTP) in Drosophila was recently reported to act as the guanine nucleotide-exchange factor for Rheb. We have studied the role of TCTP in mammalian TORC1 signaling and its control by amino acids. Reducing TCTP levels did not reproducibly affect mTORC1 signaling in amino acid-replete/insulin-stimulated cells. Moreover, overexpressing TCTP did not rescue mTORC1 signaling in amino acid-starved cells. In addition, we were unable to see any stable interaction between TCTP and Rheb or mTORC1. Accumulation of uncharged tRNA has been previously proposed to be involved in the inhibition of mTORC1 signaling during amino acid starvation. To test this hypothesis, we used a Chinese hamster ovary cell line containing a temperature-sensitive mutation in leucyl-tRNA synthetase. Leucine deprivation markedly inhibited mTORC1 signaling in these cells, but shifting the cells to the nonpermissive temperature for the synthetase did not. These data indicate that uncharged tRNALeu does not switch off mTORC1 signaling and suggest that mTORC1 is controlled by a distinct pathway that senses the availability of amino acids. Our data also indicate that, in the mammalian cell lines tested here, neither TCTP nor FKBP38 regulates mTORC1 signaling.
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