The industrially important organic compound 1,3-propanediol （1,3-PDO） is mainly used as a building block for the production of various polymers. In the present study, response surface methodology protocol was follow...The industrially important organic compound 1,3-propanediol （1,3-PDO） is mainly used as a building block for the production of various polymers. In the present study, response surface methodology protocol was followed to determine and optimize fermentation conditions for the maximum production of 1,3-PDO using marine-derived Klebsiella pneumoniae HSL4. Four nutritional supplements together with three independent culture conditions were optimized as follows： 29.3 g/L glycerol, 8.0 g/L K2HPO4, 7.6 g/L （NH4）2SO4, 3.0 g/L KH2PO4, pH 7.1, cultivation at 35℃ for 12 h. Under the optimal conditions, a maximum 1,3-PDO concentration of 14.5 g/L, a productivity of 1.21 g/（L＇h） and a conversion of glycerol of 0.49 g/g were obtained. In comparison with the control conditions, fermentation under the optimized conditions achieved an increase of 38.8% in 1,3-PDO concentration, 39.0% in productivity and 25.7% in glycerol conversion in flask. This enhancement trend was further confirmed when the fermentation was conducted in a 5-L fermentor. The optimized fermentation conditions could be an important basis for developing low- cost, large-scale methods for industrial production of 1,3-PDO in the future.展开更多
Objective:To observe the effect of moxibustion at Feishu(BL 13)on related inflammatory cells and inflammatory factors in the bronchoalveolar lavage fluid of asthma model rats,and to explore the mechanism of moxibustio...Objective:To observe the effect of moxibustion at Feishu(BL 13)on related inflammatory cells and inflammatory factors in the bronchoalveolar lavage fluid of asthma model rats,and to explore the mechanism of moxibustion in treating asthma.Methods:A total of 48 Sprague-Dawley(SD)rats were randomly divided into a normal group,a model group,a moxibustion group and a medication group,with 12 rats in each group.Except for the normal group,the rats in the other three groups were subjected to ovalbumin sensitization to stimulate the asthma.At the same time,rats in the moxibustion group received moxibustion at bilateral Feishu(BL 13),and rats in the medication group received dexamethasone by intragastric administration.Rats in the normal and the model groups only received the same fixation and normal saline by intragastric administration.After the interventions,the inspiratory resistance,the expiratory resistance,and the pulmonary compliance were measured for rats in each group;the numbers of the inflammatory cells in the bronchoalveolar lavage fluid were counted;the levels of the involved inflammatory factors in bronchoalveolar lavage fluid were detected;the pathological morphologies of the lung tissues were observed under light microscope.Results:After modeling,compared with the normal group,the rats in the model group showed obvious asthma attack-like response,significantly increased inspiratory resistance and expiratory resistance(both P<0.01),and significantly reduced pulmonary compliance(P<0.01);thickened tracheal wall and the narrowed tracheal lumen observed under the light microscope;infiltration of inflammatory cells and increased eosinophils in and around the tracheal wall;significantly increased total number of inflammatory cells and proportion of eosinophils in the bronchoalveolar lavage fluid(all P<0.01);significantly reduced levels of interleukin(IL)-10,IL-12 and interferon(IFN)-γ(all P<0.01),and significantly increased levels of IL-4,IL-5 and tumor necrosis factor(TNF)-α(all P<0.01)in the bronchoalveolar lavage fluid.After intervention,compared with the model group,rats in the moxibustion and the medication groups showed significantly reduced asthma-like reaction,pathological morphological damage of lung tissue,inspiratory resistance and expiratory resistance(all P<0.01);significantly increased pulmonary compliance(P<0.01);significantly reduced total number of inflammatory cells,proportion of eosinophils,levels of IL-4,IL-5 and TNF-αin the bronchoalveolar lavage fluid(P<0.05 or P<0.01),while significantly increased IL-12 and IFN-γlevels(all P<0.01)in the bronchoalveolar lavage fluid;rats in the medication group also showed a significantly reduced IL-10 level in the bronchoalveolar lavage fluid(P<0.01);there was no statistically significant difference between the moxibustion and the medication groups(all P>0.05).Conclusion:Both moxibustion at Feishu(BL 13)and intragastric administration of dexamethasone can improve the asthma attack-like symptoms of ovalbumin-sensitized rats;regulating the inflammatory cell numbers and the inflammatory factor contents in the lung may be one mechanism of moxibustion in treating asthma.展开更多
基金Supported by the Scientific Research Project of Marine Public Welfare Industry of China(No.201205020-4)the Knowledge Innovation Project of Chinese Academy of Sciences(No.KSCX2-EW-G-12B)the Administration of Ocean and Fisheries of Guangdong Province(No.GD2012-D01-002)
文摘The industrially important organic compound 1,3-propanediol （1,3-PDO） is mainly used as a building block for the production of various polymers. In the present study, response surface methodology protocol was followed to determine and optimize fermentation conditions for the maximum production of 1,3-PDO using marine-derived Klebsiella pneumoniae HSL4. Four nutritional supplements together with three independent culture conditions were optimized as follows： 29.3 g/L glycerol, 8.0 g/L K2HPO4, 7.6 g/L （NH4）2SO4, 3.0 g/L KH2PO4, pH 7.1, cultivation at 35℃ for 12 h. Under the optimal conditions, a maximum 1,3-PDO concentration of 14.5 g/L, a productivity of 1.21 g/（L＇h） and a conversion of glycerol of 0.49 g/g were obtained. In comparison with the control conditions, fermentation under the optimized conditions achieved an increase of 38.8% in 1,3-PDO concentration, 39.0% in productivity and 25.7% in glycerol conversion in flask. This enhancement trend was further confirmed when the fermentation was conducted in a 5-L fermentor. The optimized fermentation conditions could be an important basis for developing low- cost, large-scale methods for industrial production of 1,3-PDO in the future.
文摘Objective:To observe the effect of moxibustion at Feishu(BL 13)on related inflammatory cells and inflammatory factors in the bronchoalveolar lavage fluid of asthma model rats,and to explore the mechanism of moxibustion in treating asthma.Methods:A total of 48 Sprague-Dawley(SD)rats were randomly divided into a normal group,a model group,a moxibustion group and a medication group,with 12 rats in each group.Except for the normal group,the rats in the other three groups were subjected to ovalbumin sensitization to stimulate the asthma.At the same time,rats in the moxibustion group received moxibustion at bilateral Feishu(BL 13),and rats in the medication group received dexamethasone by intragastric administration.Rats in the normal and the model groups only received the same fixation and normal saline by intragastric administration.After the interventions,the inspiratory resistance,the expiratory resistance,and the pulmonary compliance were measured for rats in each group;the numbers of the inflammatory cells in the bronchoalveolar lavage fluid were counted;the levels of the involved inflammatory factors in bronchoalveolar lavage fluid were detected;the pathological morphologies of the lung tissues were observed under light microscope.Results:After modeling,compared with the normal group,the rats in the model group showed obvious asthma attack-like response,significantly increased inspiratory resistance and expiratory resistance(both P<0.01),and significantly reduced pulmonary compliance(P<0.01);thickened tracheal wall and the narrowed tracheal lumen observed under the light microscope;infiltration of inflammatory cells and increased eosinophils in and around the tracheal wall;significantly increased total number of inflammatory cells and proportion of eosinophils in the bronchoalveolar lavage fluid(all P<0.01);significantly reduced levels of interleukin(IL)-10,IL-12 and interferon(IFN)-γ(all P<0.01),and significantly increased levels of IL-4,IL-5 and tumor necrosis factor(TNF)-α(all P<0.01)in the bronchoalveolar lavage fluid.After intervention,compared with the model group,rats in the moxibustion and the medication groups showed significantly reduced asthma-like reaction,pathological morphological damage of lung tissue,inspiratory resistance and expiratory resistance(all P<0.01);significantly increased pulmonary compliance(P<0.01);significantly reduced total number of inflammatory cells,proportion of eosinophils,levels of IL-4,IL-5 and TNF-αin the bronchoalveolar lavage fluid(P<0.05 or P<0.01),while significantly increased IL-12 and IFN-γlevels(all P<0.01)in the bronchoalveolar lavage fluid;rats in the medication group also showed a significantly reduced IL-10 level in the bronchoalveolar lavage fluid(P<0.01);there was no statistically significant difference between the moxibustion and the medication groups(all P>0.05).Conclusion:Both moxibustion at Feishu(BL 13)and intragastric administration of dexamethasone can improve the asthma attack-like symptoms of ovalbumin-sensitized rats;regulating the inflammatory cell numbers and the inflammatory factor contents in the lung may be one mechanism of moxibustion in treating asthma.
