Using tetrabutyl titanate as the precursor, silver nitrate as the load agent, silver-doped titanium dioxide coating film was prepared by sol-gel method. Three agent samples were characterized by X-ray diffraction （XR...Using tetrabutyl titanate as the precursor, silver nitrate as the load agent, silver-doped titanium dioxide coating film was prepared by sol-gel method. Three agent samples were characterized by X-ray diffraction （XRD） analysis to investigate the crystal structure, which confirmed a synergistic antibacterial effect. The antibacterial and preservative effects of silver-doped titanium dioxide coating film on Nanfeng citrus were investigated preliminarily. Nutritional indicators of ripe Nanfeng citrus before and after preservation were detected to investigate the preservative properties of silver-doped titanium dioxide coating film and compare the effects of different components of composite coating film. The results showed that Ag＋/TiO2 composite coating film exhibited high antibacterial and preservative effects on Nanfeng citrus under visible light illumination condition.展开更多
In this study,a green synthesis method of silver nanoparticles(AgNPs)using cranberry polyphenols(CPs)as reducing agents was developed.Two composite nanoparticles(CP-AgNPs1 and CP-AgNPs2)were successfully constructed a...In this study,a green synthesis method of silver nanoparticles(AgNPs)using cranberry polyphenols(CPs)as reducing agents was developed.Two composite nanoparticles(CP-AgNPs1 and CP-AgNPs2)were successfully constructed and characterized through ultraviolet and visible(UV-Vis)spectroscopy,Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and scanning electron microscopy(SEM).The CP-AgNPs1 and CP-AgNPs2 systems exhibited evenly dispersed particles with good stability and average particle sizes of 68.35±0.16 and 76.65±0.25 nm,respectively.Moreover,both CP-AgNPs1 and CP-AgNPs2 exhibited better protective effects against hemolysis and preservative effects on fresh blueberries than AgNPs.Our findings showed that CPs exhibited a good dispersion ability to stabilize AgNPs and enhance their antioxidant activity.The current findings confirm the good dispersion ability of cranberry polyphenols and expand the possible application field of cranberry polyphenols.展开更多
Cetaceans are unique ecological engineers,and their restoration may have a crucial impact on the future structure of aquatic ecosystems,which calls for more investigations into their trophic ecology.Among current tech...Cetaceans are unique ecological engineers,and their restoration may have a crucial impact on the future structure of aquatic ecosystems,which calls for more investigations into their trophic ecology.Among current techniques,stable isotope analysis(SIA)has the advantages of non-invasive sampling and long timescales.However,the full benefits of SIA in cetacean research may not be achieved due to issues like different types of tissue between sampling methods and use of chemical preservation solutions in historical specimens.To address these challenges,we conducted a study on Narrow-ridged Finless Porpoises(Neophocaena asiaeorientalis).Multiple tissues from freshwater and marine subspecies,as well as tissues preserved using different solutions such as ethanol and formalin were collected for SIA.Linear mixed effects models were used for data analysis.Our results showed that,except for blubber,kidney,and stomach,differences between other tissues were correctable.In tissues from live sampling,we found no significant difference between blood and muscle,and skin could also be used for isotope analysis after proper correction.Ethanol preservation caused significant positive changes in δ^(13)C and δ^(15)N values of muscle,while formalin preservation caused negative changes in δ^(13)C and δ^(15)N.Our findings provide valuable insight into unifying data from stranded carcasses and live sampling,as well as correcting for the effect of chemical preservation on museum specimens.Findings from this research support further application of stable isotope analysis in the conservation of endangered finless porpoises,offer a reference for other similar cetaceans,and also provide guidance for chemical preservation when freezing conditions are not available.展开更多
基金Supported by National Natural Science Foundation of China(31360466)Science and Technology Support Program of Jiangxi Province(20142BBF6002)
文摘Using tetrabutyl titanate as the precursor, silver nitrate as the load agent, silver-doped titanium dioxide coating film was prepared by sol-gel method. Three agent samples were characterized by X-ray diffraction （XRD） analysis to investigate the crystal structure, which confirmed a synergistic antibacterial effect. The antibacterial and preservative effects of silver-doped titanium dioxide coating film on Nanfeng citrus were investigated preliminarily. Nutritional indicators of ripe Nanfeng citrus before and after preservation were detected to investigate the preservative properties of silver-doped titanium dioxide coating film and compare the effects of different components of composite coating film. The results showed that Ag＋/TiO2 composite coating film exhibited high antibacterial and preservative effects on Nanfeng citrus under visible light illumination condition.
基金financially supported by National-Local Joint Engineering Research Center for Development and Utilization of Small Fruits in Cold Regions(2023GCZX002)Student Innovation Practical Training Project of Northeast Agricultural University(S202310224060).
文摘In this study,a green synthesis method of silver nanoparticles(AgNPs)using cranberry polyphenols(CPs)as reducing agents was developed.Two composite nanoparticles(CP-AgNPs1 and CP-AgNPs2)were successfully constructed and characterized through ultraviolet and visible(UV-Vis)spectroscopy,Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and scanning electron microscopy(SEM).The CP-AgNPs1 and CP-AgNPs2 systems exhibited evenly dispersed particles with good stability and average particle sizes of 68.35±0.16 and 76.65±0.25 nm,respectively.Moreover,both CP-AgNPs1 and CP-AgNPs2 exhibited better protective effects against hemolysis and preservative effects on fresh blueberries than AgNPs.Our findings showed that CPs exhibited a good dispersion ability to stabilize AgNPs and enhance their antioxidant activity.The current findings confirm the good dispersion ability of cranberry polyphenols and expand the possible application field of cranberry polyphenols.
基金supported by the National Key R&D Program of China(grant No.2018YFD0900904,2022YFF1301603)the INTERNATIONAL COOPERATION Project of the Chinese Academy of Sciences(Grant No.152342KYSB20190025).
文摘Cetaceans are unique ecological engineers,and their restoration may have a crucial impact on the future structure of aquatic ecosystems,which calls for more investigations into their trophic ecology.Among current techniques,stable isotope analysis(SIA)has the advantages of non-invasive sampling and long timescales.However,the full benefits of SIA in cetacean research may not be achieved due to issues like different types of tissue between sampling methods and use of chemical preservation solutions in historical specimens.To address these challenges,we conducted a study on Narrow-ridged Finless Porpoises(Neophocaena asiaeorientalis).Multiple tissues from freshwater and marine subspecies,as well as tissues preserved using different solutions such as ethanol and formalin were collected for SIA.Linear mixed effects models were used for data analysis.Our results showed that,except for blubber,kidney,and stomach,differences between other tissues were correctable.In tissues from live sampling,we found no significant difference between blood and muscle,and skin could also be used for isotope analysis after proper correction.Ethanol preservation caused significant positive changes in δ^(13)C and δ^(15)N values of muscle,while formalin preservation caused negative changes in δ^(13)C and δ^(15)N.Our findings provide valuable insight into unifying data from stranded carcasses and live sampling,as well as correcting for the effect of chemical preservation on museum specimens.Findings from this research support further application of stable isotope analysis in the conservation of endangered finless porpoises,offer a reference for other similar cetaceans,and also provide guidance for chemical preservation when freezing conditions are not available.
