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Articles by Cheng Zhu
Total Records ( 3 ) for Cheng Zhu
  Yan Shi , Shanshan Dong , Zhouping Liu , Keke Yi , Junming Wang , Cheng Zhu and Feijuan Wang
  Background and Objective: Cadmium is one of the heavy metal elements in the farmland and rice pollution in China. Rice is one of the main food crops in China, how to reduce the accumulation of Cd in rice to ensure the safety of rice Cd has become a hot topic recently. Methodology: This experiment mainly study the effects of exogenous FeSO4·7H2O on the accumulation of Cd in edible rice, “Yongyou 9th” as study materials was selected through soil application of FeSO4·7H2O. The field experiments were conducted in a highly Cd polluted area (Taizhou, Zhejiang). Study on the effects of exogenous FeSO4·7H2O on the agronomic characters of rice the Cd content in different parts of rice and the soil properties. Results: The results showed that soil application of FeSO4·7H2O did not significantly affect the agronomic traits and yield of rice but it can reduce the accumulation of Cd in edible rice, among them the Cd content decreased by 21.80% in rice, exogenous FeSO4·7H2O treatment increased soil organic matter and soil pH value significantly but also reduce the content of soil available Cd. The results showed that exogenous FeSO4·7H2O through influencing the physical and chemical properties of soil and the content of available Cd in soil, so as to reduce the absorption and accumulation of Cd in different parts of rice. Conclusion: Therefore, the exogenous FeSO4·7H2O can be used as a potential and effective control technology for Cd pollution in edible rice. To a certain extent, it can ensure the safety of edible rice.
  Yuan-Hung Chien , Ning Jiang , Fang Li , Fang Zhang , Cheng Zhu and Deborah Leckband
  Micropipette manipulation measurements quantified the pre-steady state binding kinetics between cell pairs mediated by Xenopus cleavage stage cadherin. The time-dependence of the intercellular binding probability exhibits a fast forming, low probability binding state, which transitions to a slower forming, high probability state. The biphasic kinetics are independent of the cytoplasmic region, but the transition to the high probability state requires the third extracellular domain EC3. Deleting either EC3 or EC3–5, or substituting Trp2 for Ala reduces the binding curves to a simple, monophasic rise in binding probability to a limiting plateau, as predicted for a single site binding mechanism. The two stage cadherin binding process reported here directly parallels previous biophysical studies, and confirms that the cadherin ectodomain governs the initial intercellular adhesion dynamics.
  Arkadiusz G. Klopocki , Tadayuki Yago , Padmaja Mehta , Jun Yang , Tao Wu , Anne Leppanen , Nicolai V. Bovin , Richard D. Cummings , Cheng Zhu and Rodger P. McEver
  Selectin-ligand interactions (bonds) mediate leukocyte rolling on vascular surfaces. The molecular basis for differential ligand recognition by selectins is poorly understood. Here, we show that substituting one residue (A108H) in the lectin domain of L-selectin increased its force-free affinity for a glycosulfopeptide binding site (2-GSP-6) on P-selectin glycoprotein ligand-1 (PSGL-1) but not for a sulfated-glycan binding site (6-sulfo-sialyl Lewis x) on peripheral node addressin. The increased affinity of L-selectinA108H for 2-GSP-6 was due to a faster on-rate and to a slower off-rate that increased bond lifetimes in the absence of force. Rather than first prolonging (catching) and then shortening (slipping) bond lifetimes, increasing force monotonically shortened lifetimes of L-selectinA108H bonds with 2-GSP-6. When compared with microspheres bearing L-selectin, L-selectinA108H microspheres rolled more slowly and regularly on 2-GSP-6 at low flow rates. A reciprocal substitution in P-selectin (H108A) caused faster microsphere rolling on 2-GSP-6. These results distinguish molecular mechanisms for L-selectin to bind to PSGL-1 and peripheral node addressin and explain in part the shorter lifetimes of PSGL-1 bonds with L-selectin than P-selectin.
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