Objective:To investigate the effects of powdered silver zeolite(SZ)on the in vitro growth of the fish pathogen Saprolegnia sp.Methods:The antifungal activity of SZ was evaluated by determining the minimum inhibitory c...Objective:To investigate the effects of powdered silver zeolite(SZ)on the in vitro growth of the fish pathogen Saprolegnia sp.Methods:The antifungal activity of SZ was evaluated by determining the minimum inhibitory concentrations using two-fold serial dilutions of powdered SZ in a glucose yeast extract agar at 22℃.The growth of Saprolegnia sp.on the SZ agar treatments was compared to that on SZ-free agar controls.Results:The results showed that SZ had an inhibitory effect on the in vitro growth of the tested fungi.The minimum inhibitory concentration of SZ for Saprolegnia sp.was also calculated at 600 mg/L,which is equal to 0.06 percent.Conclusions:SZ is a potential good candidate to replace teratogenic and toxic agents,such as malachite green in aquaculture systems.展开更多
Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec-...Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec- troscopy with pyridine adsorption （Py-IR）, N2 adsorption and X-ray diffraction （XRD）. The effects of Ag loading and steaming treatment on catalytic performances were studied. It is found that the activity ofHT_SM-5 （HZ） catalyst significantly decreases with the steaming time, whereas AgHZ catalysts show stable activity in the steaming time of 24-48 h and their activities increase with the Ag loading. When the steaming time is 24-48 h, the yield of propylene over HZ catalyst significantly decreases, whereas it is stable over AgHZ catalysts. The AgHZ catalysts with Ag loadings of 0.28%-0.43% （by mass） show similar propylene yields （-30%）, which are higher than that over the AgHZ catalyst with a Ag loading of 0.55% （by mass）. These results indicate that the steam-treated AgHZ catalysts with optimum Ag loadings have higher yield of propylene and are more stable than the steam- treated HZ catalyst. The regeneration stability measurement in butene cracking also shows that the AgHZ catalyst steam-treated under a suitable condition has better stability than the HZ catalyst.展开更多
基金Supported by Tarbiat Modares University(TMU)of Iran and Nanomaterial Technology Development Program(Green Nano Technology Development Program)through the National Research Foundation of Korea(NRF)funded by the Korean Ministry of Education,Science and Technology(No.2011-0020090).
文摘Objective:To investigate the effects of powdered silver zeolite(SZ)on the in vitro growth of the fish pathogen Saprolegnia sp.Methods:The antifungal activity of SZ was evaluated by determining the minimum inhibitory concentrations using two-fold serial dilutions of powdered SZ in a glucose yeast extract agar at 22℃.The growth of Saprolegnia sp.on the SZ agar treatments was compared to that on SZ-free agar controls.Results:The results showed that SZ had an inhibitory effect on the in vitro growth of the tested fungi.The minimum inhibitory concentration of SZ for Saprolegnia sp.was also calculated at 600 mg/L,which is equal to 0.06 percent.Conclusions:SZ is a potential good candidate to replace teratogenic and toxic agents,such as malachite green in aquaculture systems.
基金Supported by the National Science Foundation of China(U1162129)the Science and Technology Department of Zhejiang Province(2009R50020)
文摘Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec- troscopy with pyridine adsorption （Py-IR）, N2 adsorption and X-ray diffraction （XRD）. The effects of Ag loading and steaming treatment on catalytic performances were studied. It is found that the activity ofHT_SM-5 （HZ） catalyst significantly decreases with the steaming time, whereas AgHZ catalysts show stable activity in the steaming time of 24-48 h and their activities increase with the Ag loading. When the steaming time is 24-48 h, the yield of propylene over HZ catalyst significantly decreases, whereas it is stable over AgHZ catalysts. The AgHZ catalysts with Ag loadings of 0.28%-0.43% （by mass） show similar propylene yields （-30%）, which are higher than that over the AgHZ catalyst with a Ag loading of 0.55% （by mass）. These results indicate that the steam-treated AgHZ catalysts with optimum Ag loadings have higher yield of propylene and are more stable than the steam- treated HZ catalyst. The regeneration stability measurement in butene cracking also shows that the AgHZ catalyst steam-treated under a suitable condition has better stability than the HZ catalyst.
