[ Objective] The aim was to study pretreatment of ultrasound enhancing dilute H2SO4 on cellulase activity of corn straw liquid fermentation and explore the pretretment＇ s optimal conditions. [ Method ] By using ortho...[ Objective] The aim was to study pretreatment of ultrasound enhancing dilute H2SO4 on cellulase activity of corn straw liquid fermentation and explore the pretretment＇ s optimal conditions. [ Method ] By using orthogonal test, the pretretment of ultrasound enhancing dilute H2SO4 on corn straw was studied, then straw was fermented as the sole carbon source. Finally, the cellulase activity in extracellular fermentation broth was determined. [Result] The results showed that cellulase activity in extracellular broth was greatest under the conditions of acid bath time 3 h, acid concentration 3.5%, ultrasonic power 150 W, and ultrasonic time 5 h. They were FPA 15.82 U/ml, Cx 39.9 U/ml, 13-Giu 55.94 U/ml respectively. [ Conclusion] Under the above conditions, extracellular cellulase production has a high stability.展开更多
选取饱满籽粒的美洲商陆（Phytolacca americana L．）种子，用以下方法破除种子休眠：（1）98％H2SO4浸种20、40、60min；先用98％H2SO4浸泡40min，再分别用100、200、300、400mg．L^-1的赤霉素（GA3）浸种60min。（2）用去离子水浸泡...选取饱满籽粒的美洲商陆（Phytolacca americana L．）种子，用以下方法破除种子休眠：（1）98％H2SO4浸种20、40、60min；先用98％H2SO4浸泡40min，再分别用100、200、300、400mg．L^-1的赤霉素（GA3）浸种60min。（2）用去离子水浸泡并以超声波处理30、60、90min（超声频率40kHz，温度50℃，下同）；超声波处理60min后，再分别用100、200、300、400mg．L^-1 GA，处理60min。展开更多
The blast furnace slag bearing Ti02 in Panzhihua, China, is an important resource to be utilized. In the present paper, the effects of the ratio of slag to H2S04, the reaction temperature, the particle size of the sla...The blast furnace slag bearing Ti02 in Panzhihua, China, is an important resource to be utilized. In the present paper, the effects of the ratio of slag to H2S04, the reaction temperature, the particle size of the slag, and the concentration of H2S04 on the reaction rate and the acidolysis ratio of Ti were studied. The results indicated that the maximum acidolysis ratio reached 98%, which can serve as an experimental basis for the production of titania from the slag.展开更多
基金Supported by the National Key Technology R&D Program during the11~(th)five-year Plan(2007BAD34B03)the Important Project of Ministryof Education(107127)Scientific Research Foundation ofHefei University of Technology(113-036404)~~
文摘[ Objective] The aim was to study pretreatment of ultrasound enhancing dilute H2SO4 on cellulase activity of corn straw liquid fermentation and explore the pretretment＇ s optimal conditions. [ Method ] By using orthogonal test, the pretretment of ultrasound enhancing dilute H2SO4 on corn straw was studied, then straw was fermented as the sole carbon source. Finally, the cellulase activity in extracellular fermentation broth was determined. [Result] The results showed that cellulase activity in extracellular broth was greatest under the conditions of acid bath time 3 h, acid concentration 3.5%, ultrasonic power 150 W, and ultrasonic time 5 h. They were FPA 15.82 U/ml, Cx 39.9 U/ml, 13-Giu 55.94 U/ml respectively. [ Conclusion] Under the above conditions, extracellular cellulase production has a high stability.
文摘选取饱满籽粒的美洲商陆（Phytolacca americana L．）种子，用以下方法破除种子休眠：（1）98％H2SO4浸种20、40、60min；先用98％H2SO4浸泡40min，再分别用100、200、300、400mg．L^-1的赤霉素（GA3）浸种60min。（2）用去离子水浸泡并以超声波处理30、60、90min（超声频率40kHz，温度50℃，下同）；超声波处理60min后，再分别用100、200、300、400mg．L^-1 GA，处理60min。
文摘The blast furnace slag bearing Ti02 in Panzhihua, China, is an important resource to be utilized. In the present paper, the effects of the ratio of slag to H2S04, the reaction temperature, the particle size of the slag, and the concentration of H2S04 on the reaction rate and the acidolysis ratio of Ti were studied. The results indicated that the maximum acidolysis ratio reached 98%, which can serve as an experimental basis for the production of titania from the slag.
