本实验以金黄色葡萄球菌(St aphyl occoccus aureaus Rosenbach)、大肠埃希菌(Escheri-chi a col i)2种需氧型细菌作为供试细菌,用圆形纸片法对羊栖菜和海带的无菌水、乙醚和乙醇提取物进行抑菌试验。结果表明:采用水提法、95%乙醇浸提...本实验以金黄色葡萄球菌(St aphyl occoccus aureaus Rosenbach)、大肠埃希菌(Escheri-chi a col i)2种需氧型细菌作为供试细菌,用圆形纸片法对羊栖菜和海带的无菌水、乙醚和乙醇提取物进行抑菌试验。结果表明:采用水提法、95%乙醇浸提取法和乙醚索氏提取法均能从羊栖菜和海带中提取出活性物质,提取回收率依次为水提法>乙醇提法>乙醚提法;比较对羊栖菜和海带3种不同提取方法得出:乙醇提取物对两种菌体的抑菌活性相对水提物和乙醚提取物较好,且乙醇提取物乙酸乙酯相对水相抑菌活性较好;比较羊栖菜和海带乙醇提取物乙酸乙酯相的MIC得出:海带对大肠埃希菌和金黄色葡萄球菌的MIC相对羊栖菜较低,抑菌效果较好。展开更多
A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality at...A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality attributes of sugarcane. Foliar application of seaweed extracts were carried out on sugarcane at seedling and tillering stages. Agronomic traits,yield,sugar content,leaf drought resistance and pest resistance of sugarcane were analyzed for optimization of application time at proper phenological stages. The results that compared to the control,the application of seaweed extracts at different stages of sugarcane enhanced production of sugarcane with increase rate of 10. 83%-12. 87%,and improved theoretical sugar yield of sugarcane up to 1. 9 t/ha while enhancing water retention capacity and water content of sugarcane leaves that consequently led to wilting risk reduction by escaping drought and improved resilience to drought impact on sugarcane. Seaweed extracts also performed excellent in pest management of sugarcane,and they exerted different control effects on sugarcane borers,aphids and thrips. An increase in output of sugarcane was observed to be 15. 09% compared to control,while the net income was improved by up to 32. 64% in the seaweed extracts application treatment. Foliar application of seaweed extracts not only enhanced growth,cold resistance,pest resistance,output value but also improved economic returns,giving a positive affirmation for the recommendation of seaweed extract application.展开更多
In this work,response surface methodology(RSM)was employed to model and optimize electrodialysis process for mercury(Hg(II))removal from seaweed extracts.Box-Behnken design(BBD)was utilized to evaluate the effects and...In this work,response surface methodology(RSM)was employed to model and optimize electrodialysis process for mercury(Hg(II))removal from seaweed extracts.Box-Behnken design(BBD)was utilized to evaluate the effects and the interaction of influential variables such as operating voltage,influent flow rate,initial concentration of Hg(II)on the removal rate of Hg(II).The developed regression model for removal rate response was validated by analysis of variance,and presented a good agreement of the experimental data with the quadratic equation with high value coefficient of determination value(R2=0.9913,RAdj 2=0.9678).The optimum operating parameters were determined as 7.17V operating voltage,72.54L h−1 influent flow rate and 5.04mgL−1 initial concentration of mercury.Hg(II)removal rate of 76.45%was acquired under the optimum conditions,which showed good agreement with model-predicted(75.81%)result.The results revealed that electrodialysis can be considered as a promising strategy for removal of Hg(II)from seaweed extracts.展开更多
文摘本实验以金黄色葡萄球菌(St aphyl occoccus aureaus Rosenbach)、大肠埃希菌(Escheri-chi a col i)2种需氧型细菌作为供试细菌,用圆形纸片法对羊栖菜和海带的无菌水、乙醚和乙醇提取物进行抑菌试验。结果表明:采用水提法、95%乙醇浸提取法和乙醚索氏提取法均能从羊栖菜和海带中提取出活性物质,提取回收率依次为水提法>乙醇提法>乙醚提法;比较对羊栖菜和海带3种不同提取方法得出:乙醇提取物对两种菌体的抑菌活性相对水提物和乙醚提取物较好,且乙醇提取物乙酸乙酯相对水相抑菌活性较好;比较羊栖菜和海带乙醇提取物乙酸乙酯相的MIC得出:海带对大肠埃希菌和金黄色葡萄球菌的MIC相对羊栖菜较低,抑菌效果较好。
基金Supported by Guangdong Provincial Science and Technology Plan(2017A070701030,2017B030314123)Earmarked Fund for China Agriculture Research System(CARS-170203)+1 种基金Project of Guangdong Academy of Sciences(2017GDASCX-0105),2019GDASYL-0104012)Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences(1630052019001)
文摘A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality attributes of sugarcane. Foliar application of seaweed extracts were carried out on sugarcane at seedling and tillering stages. Agronomic traits,yield,sugar content,leaf drought resistance and pest resistance of sugarcane were analyzed for optimization of application time at proper phenological stages. The results that compared to the control,the application of seaweed extracts at different stages of sugarcane enhanced production of sugarcane with increase rate of 10. 83%-12. 87%,and improved theoretical sugar yield of sugarcane up to 1. 9 t/ha while enhancing water retention capacity and water content of sugarcane leaves that consequently led to wilting risk reduction by escaping drought and improved resilience to drought impact on sugarcane. Seaweed extracts also performed excellent in pest management of sugarcane,and they exerted different control effects on sugarcane borers,aphids and thrips. An increase in output of sugarcane was observed to be 15. 09% compared to control,while the net income was improved by up to 32. 64% in the seaweed extracts application treatment. Foliar application of seaweed extracts not only enhanced growth,cold resistance,pest resistance,output value but also improved economic returns,giving a positive affirmation for the recommendation of seaweed extract application.
基金financially supported by the Key Research Project of Shandong Province (No. 2017CXGC 1004)the National Natural Science Foundation of China (No. 21878178)+1 种基金the Shandong Science and Technology Development Plan (No. 2018GGX107001)the Young Tai- shan Scholars Program of Shandong Province
文摘In this work,response surface methodology(RSM)was employed to model and optimize electrodialysis process for mercury(Hg(II))removal from seaweed extracts.Box-Behnken design(BBD)was utilized to evaluate the effects and the interaction of influential variables such as operating voltage,influent flow rate,initial concentration of Hg(II)on the removal rate of Hg(II).The developed regression model for removal rate response was validated by analysis of variance,and presented a good agreement of the experimental data with the quadratic equation with high value coefficient of determination value(R2=0.9913,RAdj 2=0.9678).The optimum operating parameters were determined as 7.17V operating voltage,72.54L h−1 influent flow rate and 5.04mgL−1 initial concentration of mercury.Hg(II)removal rate of 76.45%was acquired under the optimum conditions,which showed good agreement with model-predicted(75.81%)result.The results revealed that electrodialysis can be considered as a promising strategy for removal of Hg(II)from seaweed extracts.
