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Articles by Y. J. Liu
Total Records ( 4 ) for Y. J. Liu
  L. X. Tian , Y. J. Liu , S. S. O. Hung , D. F. Deng , H. J. Yang , J. Niu and G Y. Liang
  Problem statement: Feeding strategy is the important factor in aquaculture. Feeding strategy not only could affect the growth performance of grass carp and feed efficiency, but also could affect the quality and environment of water resource. We have proved that glucose was more suitable than starch as the carbohydrate source for grass carp under the restricted feeding frequency. While different feeding strategies may have resulted in the differences in carbohydrate utilization among fish species. No studies have so far been reported that compare the utilization of carbohydrate source in different feeding strategy of grass carp. Approach: A 9-weeks growth trial was conducted to determine the effect of feeding frequency (2, 6, 12 and 23 meals day-1) and two different carbohydrate source (30% starch versus 30% glucose) on the carbohydrate utilization of grass carp (Ctenopharyngodon idella). Both of the two diets with the same feeding rates but with four different feeding frequencies were fed to triplicate groups of grass carp (mean initial wet weight 35.94±1.86 g). Results: In the glucose diet groups, significantly (p<0.05) higher Final Body Weight (FBW, g), Weight Gain (WG, %), Specific Growth rate (SGR, % day-1), Feed Efficiency (FE, %), Protein Efficiency Ratio (PER), body lipid and serum Triglyceride (serum TG) were observed in the 6, 12 and 23 meals day-1 feeding treatments than that in 2 meals day-1 feeding treatment, all these indexes were not significantly different among the 6, 12 and 23 meals day-1 feeding treatments. While in the starch diet groups, FBW, WG and SGR of fish only in the 6 meals day-1 feeding treatment were significantly (p<0.05) higher than that of fish in the 2 meals day-1 feeding treatment and FBW, WG and SGR of fish in the 12 and 23 meals day-1 feeding treatments provided intermediate results and were not significantly different from the 2 and 6 meals day-1 feeding treatments. When compared the effects between the glucose and starch diet groups in the same feeding frequency, significantly (p<0.05) higher FBW, WG, SGR, FE and PER were observed in the glucose than the starch fed grass carp, only body lipid content was significantly higher in grass carp fed the starch than the glucose diets. Conclusion: It suggested that 6 meals day-1 feeding was sufficient for the optimal growth and feed efficiency for grass carp on 35.1-37.5 g. Furthermore, the growth performance also suggested that glucose was superior to starch as the carbohydrate source for grass carp under the feeding frequency of 6, 12 and 23 meals day-1.
  Y. J. Liu , P. Kuschk , A. N. Zhang and X. C. Wang
  Two new strains named XA05 and FG03 were isolated from activated sludge and phenol-contaminated soils, respectively. Analysis of 16S rRNA gene sequences showed that XA05 belonged to an Acinetobacter sp. and FG03 was closely related to Sphingomonas sp. Strains XA05 and FG03 were cultivated in minimal medium supplemented with different phenol concentrations as a sole carbon source. Results showed that 99.5% and 78.3% phenol were removed by strain XA05 within 45 h and 60 h, with an initial concentration of 800 mg/l and 1000 mg/l phenol, respectively. In addition, 97.6% and 68.1% phenol were removed by strain FG03 under the same conditions. When two strains were mixed at the ratio of 1:1, 99.8% and 97.2% of phenol were removed within 35 h and 60 h, with an initial concentration of 800 mg/l and 1000 mg/l phenol, respectively. Kinetics of phenol degradation by strain XA05 and FG03 and the influence of other aromatic compounds such as benzophenone, 4-hydroxybenzoic acid, cinnamic acid and resorcin to the growth of two strains were also investigated in this study.
  W Cao , L Bover , M Cho , X Wen , S Hanabuchi , M Bao , D. B Rosen , Y. H Wang , J. L Shaw , Q Du , C Li , N Arai , Z Yao , L. L Lanier and Y. J. Liu

Plasmacytoid dendritic cells (pDCs) produce copious type I interferon (IFN) upon sensing nucleic acids through Toll-like receptor (TLR) 7 and TLR9. Uncontrolled pDC activation and IFN production are implicated in lymphopenia and autoimmune diseases; therefore, a mechanism controlling pDC IFN production is essential. Human pDCs specifically express an orphan receptor, immunoglobulin-like transcript 7 (ILT7). Here, we discovered an ILT7 ligand expressed by human cell lines and identified it as bone marrow stromal cell antigen 2 (BST2; CD317). BST2 directly binds to purified ILT7 protein, initiates signaling via the ILT7–FcRI complex, and strongly inhibits production of IFN and proinflammatory cytokines by pDCs. Readily induced by IFN and other proinflammatory cytokines, BST2 may modulate the human pDC’s IFN responses through ILT7 in a negative feedback fashion.

  N Lu , Y. H Wang , K Arima , S Hanabuchi and Y. J. Liu

Whether thymic stromal lymphopoietin (TSLP) directly induces potent human CD4+ T cell proliferation and Th2 differentiation is unknown. We report that resting and activated CD4+ T cells expressed high levels of IL-7 receptor a chain but very low levels of TSLP receptor (TSLPR) when compared with levels expressed in myeloid dendritic cells (mDCs). This was confirmed by immunohistology and flow cytometry analyses showing that only a subset of mDCs, with more activated phenotypes, expressed TSLPR in human tonsils in vivo. IL-7 induced strong STAT1, -3, and -5 activation and promoted the proliferation of naive CD4+ T cells in the presence of anti-CD3 and anti-CD28 monoclonal antibodies, whereas TSLP induced weak STAT5 activation, associated with marginally improved cell survival and proliferation, but failed to induce cell expansion and Th2 differentiation. The effect of TSLP on enhancing strong human T cell proliferation was observed only when sorted naive CD4+ T cells were cultured with mDCs at levels as low as 0.5%. TSLP could only induce naive CD4+ T cells to differentiate into Th2 cells in the presence of allogeneic mDCs. These results demonstrate that IL-7 and TSLP use different mechanisms to regulate human CD4+ T cell homeostasis.

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