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Articles by Z. Li
Total Records ( 4 ) for Z. Li
  Y. Liua, X. Wang , H. Wang and Z. Li
  This paper reports the result of an investigation into the effect of electric and mechanical loads on the morphological evolution of a void in piezoelectric materials based on a model for the morphological evolution of a void, the thermodynamics potential and energy principle. Thus, the path and the bifurcation condition of the morphological evolution of the void in piezoelectric materials are described, which gives some insight into the reliability of piezoelectric films under electric and mechanical loads.
  Z. Li , S. M. Henning , Y. Zhang , N. Rahnama , A. Zerlin , G. Thames , C. H. Tseng and D. Heber
 

Aims

Consumption of a high-fat diet has been demonstrated to promote endothelial dysfunction, possibly through an increase in lipid peroxidation and decrease in serum nitric oxide. The present study was designed to investigate whether consumption of a hamburger cooked with a polyphenol-rich spice mixture will reduce postprandial lipid oxidation and endothelial dysfunction in men with Type 2 diabetes.

Methods

Twenty-two subjects consumed burgers cooked with salt only (control burger) or with salt and spice mix (spice burger) in randomized order. The postprandial concentration of urinary malondialdehyde and nitrate/nitrite as well as the peripheral arterial tonometry score were determined.

Results

Eighteen subjects completed the study. Postprandial serum glucose, insulin and triglyceride concentrations were similar in all subjects after control burger or spice burger consumption. Urine malondialdehyde excretion in mmol/g creatinine was reduced by 31% (P < 0.001) after consuming the spice burger compared with the control burger. Two hours after consumption of the burgers, the peripheral arterial tonometry score was significantly different between control burger consumption (−9.7 ± 21.5%) and spice burger consumption (+18.0 ± 42.4%) (P = 0.025). Mean urinary nitrate/nitrite concentrations in urine collected during the 6 h after consumption of the control burger was 9.09 ± 5.7 mmol/g creatinine, but 12.37 ± 7.00 mmol/g creatinine after the spice burger (P = 0.053).

Conclusion

Adding a spice mix to hamburger meat prior to cooking resulted in a reduction in urinary malondialdehyde, an increase in urinary nitrate/nitrite and improvement of postprandial endothelial dysfunction in men with Type 2 diabetes. Therefore, cooking a hamburger with a polyphenol-rich spice mixture may lead to potential cardiovascular benefits in patients with Type 2 diabetes mellitus.

  J.L. Chen , Z. Li and Y.Y. Zhao
  An Al brass alloy with Ce addition has been developed with an aim to replace the As Al brass, because the latter poses health and environmental problems. The corrosion behavior of the two alloys in NaCl (35 g/L) and NaCl (35 g/L) + NH4Cl (26.75 g/L) solutions has been investigated. The morphology and compositional changes in the alloys have been studied. In both solutions, the corrosion rates of the Ce Al brass are very similar to those of As Al brass. Ce is a suitable alternative to As as an alloying element in Al brass for corrosion resistance improvement.
  R. Yang , T. Xia , G. Xu , Z. Li , Z. Ying and X. Xu
  Our study sought to investigate the immune response of cytotoxic T lymphocytes to human cytomegalovirus (HCMV) in kidney transplant recipients with virus reactivation. Nine kidney transplant recipients with serum HCMV immunoglobulin G and HLA-A*0201 genotype displayed HCMV pp65 antigenemia and were compared with 29 control recipients who were free of antigenemia. The frequency of total HCMV-specific cytotoxic T cells was determined using HLA-A2-NLVPMVATV-pentamer staining. The frequency of HCMV specific interferon (INF)-γ secreting CD8+ T cells was determined using intracellular INF-γ staining after NLVPMVATV pulsing in vitro. The proportion of IFN-γ secreting pentamer-stained CD8+ T cells was calculated, representing the capacity for INF-γ secretion among HCMV-specific CD8+ T cells. We observed that the frequency of HCMV-specific pentamer-stained CD8+ T cells and HCMV-specific IFN-γ secreting CD8+ T cells both remained unchanged, yet the proportion of IFN-γ secreting CD8+ T cells showed a significant difference between the 2 groups (39.2% ± 17.2% vs 20.0% ± 13.3% respectively; P = .004), reflecting impaired IFN-γ secreting capacity of HCMV-specific CD8+ T cells among kidney transplant recipients displaying antigenemia, which may be a crucial reason for HCMV reactivation in immunosuppressed patients.
 
 
 
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