ABSTRACT
<p><b>OBJECTIVE</b>This study aimed to determine the effects of copper content on the corrosion resistance of CoCrMoCu alloy and its in vitro antibacterial performance.</p><p><b>METHODS</b>CoCrMoCu specimens with different Cu contents (2%, 3%, 5%, and 7%) were prepared by vacuum melting method. CoCrMo without Cu served as control. The corrosion resistance of the specimens was measured by electrochemistry. The antibacterial effects of the specimens on Staphylococcus aureus and Escherichia coli were analyzed by coating-film method.</p><p><b>RESULTS</b>Compared with CoCrMo without Cu, the addition of 2%-5% Cu to CoCrMo improved the pitting and uniform corrosion of CoCrMo alloy and decreased the corrosion current density. The antibacterial performance of CoCrMoCu alloy increased with increased Cu content. The antibacterial rate of alloy was 99% when Cu content exceeded 5%.</p><p><b>CONCLUSIONS</b>Cu addition had a statistically significant influence on the corrosion resistance and antibacterial performance of CoCrMoCu. CoCrMoCu has better corrosion resistance and antibacterial performance when Cu content is 5%.</p>
ABSTRACT
Objective: To construct the mutants of oncogene p28GANK with different ankyrin repeats deleted, so as to further study the potential role of p28GANK in hepatocellular carcinoma (HCC). Methods: QuikChang Site-Directed Mutagenesis Kit was used to construct five p28GANK mutants with different ankyrin repeats deleted and their influences on p53 were also investigated. Results: Five deletion mutants of p28GANK were as follows: 39-71aa, 72-104aa, 105-137aa, 138-170aa, and 171-203aa. Agarose gel electrophoresis and Western blotting analysis confirmed the correct construction of these mutants. Wild type p28GANK promoted degradation of p53, but the 5 mutants had no noticeable effects on expression of p53. Conclusion: We have successfully constructed five p28GANK ankyrin repeat-deleted mutants. It is confirmed that the regulation of p53 needs the complete ankyrin repeats of p28GANK, which paves a way for further research on ankyrin and the role of p28GANK in HCC.