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Articles by Heng Zhang
Total Records ( 2 ) for Heng Zhang
  Heng Zhang and Shiyu Li
  Hypoxia in the Pearl River Estuary (PRE) during summer is one of the problems caused by increasing anthropogenic pollutant inputs due to population increase and economic development in recent years. The mechanism for hypoxia in the PRE has to be understood firstly before any management policy can be established. A three-dimensional water quality model was therefore developed to study the dissolved oxygen (DO) budget of the PRE in summer and to identify the roles that various physical and biochemical processes played in DO dynamics.

Results show that above the pycnocline, horizontal transport of DO is mainly balanced by reaeration, and photosynthesis appears to play a more important role in the shelf area than inside the PRE due to reduced turbidity. Below the pycnocline, horizontal transport of DO is balanced by biochemical processes. Regarding the DO depletion processes in the PRE above the pycnocline, DOC oxidation is the largest consumer of DO, while nitrification and phytoplankton respiration rank second and third, respectively. Below the pycnocline, SOD dominates DO depletion processes, following by DOC oxidation, nitrification and phytoplankton respiration. The dominant role of SOD in DO depletion processes of the PRE is caused by the shallow topography and high deposition rate of POC. Vertical DO transport in the PRE shows remarkably spatial variability due to complicated hydrology and topography in the PRE. The vertical DO fluxes are dominated by advective fluxes as a result of intense tidal forcing and gravitational circulation in deep channels, while diffusive fluxes dominate in the vertical fluxes within the shoal area as a result of increasing DO vertical gradient due to hypoxia.

  Qun-Ying Lei , Heng Zhang , Bin Zhao , Zheng-Yu Zha , Feng Bai , Xin-Hai Pei , Shimin Zhao , Yue Xiong and Kun-Liang Guan
  TAZ is a WW domain containing a transcription coactivator that modulates mesenchymal differentiation and development of multiple organs. In this study, we show that TAZ is phosphorylated by the Lats tumor suppressor kinase, a key component of the Hippo pathway, whose alterations result in organ and tissue hypertrophy in Drosophila and contribute to tumorigenesis in humans. Lats phosphorylates TAZ on several serine residues in the conserved HXRXXS motif and creates 14-3-3 binding sites, leading to cytoplasmic retention and functional inactivation of TAZ. Ectopic expression of TAZ stimulates cell proliferation, reduces cell contact inhibition, and promotes epithelial-mesenchymal transition (EMT). Elimination of the Lats phosphorylation sites results in a constitutively active TAZ, enhancing the activity of TAZ in promoting cell proliferation and EMT. Our results elucidate a molecular mechanism for TAZ regulation and indicate a potential function of TAZ as an important target of the Hippo pathway in regulating cell proliferation tumorigenesis.
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