The long-term aging behavior of an alumina-toughened zirconia （ATZ） ceramic in artificial saliva hydrothermal atmosphere was determined and compared with that of tetragonal zirconia polycrystals doped with 3mo1% Y2...The long-term aging behavior of an alumina-toughened zirconia （ATZ） ceramic in artificial saliva hydrothermal atmosphere was determined and compared with that of tetragonal zirconia polycrystals doped with 3mo1% Y203 （3Y-TZP）. The specimens of 3Y-TZP and ATZ were aged in distilled water and artificial salivary respectively at 134 ~C. Monoclinic phase content was evaluated by X-ray diffraction （XRD） analysis. Specimen strength was determined by a biaxial bending test. Surface screening was done using an atomic force microscope （AFM）. No statistically significant influence of any treatment on strength was demonstrated for either material. However, XRD measurements revealed ATZ＇s anti-aging properties were much better than TZP after the aging treatment. Therefore, ATZ can be applied to the field of dentistry. Artificial saliva in ceramic surface sediments may be useful for stren^heninl ceramics.展开更多
Kanamycin is a commonly used aminoglycoside anti-infective drug with good antimicrobial effects against most Enterobacteriaceae bacteria and is often used in animal husbandry and aquaculture.However,excessive amount o...Kanamycin is a commonly used aminoglycoside anti-infective drug with good antimicrobial effects against most Enterobacteriaceae bacteria and is often used in animal husbandry and aquaculture.However,excessive amount of kanamycin can be a threat to human health.Therefore,it is crucial to develop a concise and rapid assay for kanamycin.Colorimetric assay based on nanozymes is considered as one of the effective methods for rapid and efficient detection of pollutants.Compared with natural enzymes,nanozymes have the advantages of simple synthesis,controllable cost,high stability and high catalytic efficiency.Therefore,a polyoxometalates-based material,[H_(3)PW_(12)O_(40)(BPE)_(2.5)]·3H_(2)O(PW_(12)/BPE)(BPE=1,2-bis(4-pyridyl)ethane),was synthesized by hydrothermal method in this work.PW_(12)/BPE exhibited satisfactory laccase-like activity as a nanozyme.Kinetic study showed that the laccase-mimicking performance of PW_(12)/BPE is low in K_(m)but high in V_(max).Colorimetric assay was carried out for the content of kanamycin based on the laccase-like performance of PW_(12)/BPE.The results exhibited a good linear relationship between kanamycin concentration and absorbance,and the LOD was as low as 16.66μmol·L^(-1).展开更多
基金Funded by the National High-Tech Research and Development Program of China(863Program)(No.2006AA03Z440)
文摘The long-term aging behavior of an alumina-toughened zirconia （ATZ） ceramic in artificial saliva hydrothermal atmosphere was determined and compared with that of tetragonal zirconia polycrystals doped with 3mo1% Y203 （3Y-TZP）. The specimens of 3Y-TZP and ATZ were aged in distilled water and artificial salivary respectively at 134 ~C. Monoclinic phase content was evaluated by X-ray diffraction （XRD） analysis. Specimen strength was determined by a biaxial bending test. Surface screening was done using an atomic force microscope （AFM）. No statistically significant influence of any treatment on strength was demonstrated for either material. However, XRD measurements revealed ATZ＇s anti-aging properties were much better than TZP after the aging treatment. Therefore, ATZ can be applied to the field of dentistry. Artificial saliva in ceramic surface sediments may be useful for stren^heninl ceramics.
基金supported by the National Natural Science Foundation of China (22171039)
文摘Kanamycin is a commonly used aminoglycoside anti-infective drug with good antimicrobial effects against most Enterobacteriaceae bacteria and is often used in animal husbandry and aquaculture.However,excessive amount of kanamycin can be a threat to human health.Therefore,it is crucial to develop a concise and rapid assay for kanamycin.Colorimetric assay based on nanozymes is considered as one of the effective methods for rapid and efficient detection of pollutants.Compared with natural enzymes,nanozymes have the advantages of simple synthesis,controllable cost,high stability and high catalytic efficiency.Therefore,a polyoxometalates-based material,[H_(3)PW_(12)O_(40)(BPE)_(2.5)]·3H_(2)O(PW_(12)/BPE)(BPE=1,2-bis(4-pyridyl)ethane),was synthesized by hydrothermal method in this work.PW_(12)/BPE exhibited satisfactory laccase-like activity as a nanozyme.Kinetic study showed that the laccase-mimicking performance of PW_(12)/BPE is low in K_(m)but high in V_(max).Colorimetric assay was carried out for the content of kanamycin based on the laccase-like performance of PW_(12)/BPE.The results exhibited a good linear relationship between kanamycin concentration and absorbance,and the LOD was as low as 16.66μmol·L^(-1).
