A novel lipase gene(lip4346)encoding a primary translation product with 176 amino acids was screened from the genome fine mapping of the macroalgae-associated bacterial strain Microbulbifer sp.YNDZ01.Macroalgae were c...A novel lipase gene(lip4346)encoding a primary translation product with 176 amino acids was screened from the genome fine mapping of the macroalgae-associated bacterial strain Microbulbifer sp.YNDZ01.Macroalgae were collected from the coast of the Halmahera Island of Indonesia.The lip4346 gene was cloned and heterologously expressed in Escherichia coli.The purified recombinant Lip4346 protein had a molecular mass of 19 k Da,a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE),and a maximum enzyme activity of 31.2 U m L-1.The optimal temperature and pH for the lipase activity of Lip4346 were 70℃and 10.0,respectively.Lip4346 was tolerant with a number of organic solvents and detergents,and was active toward triacylglycerols and p-nitrophenyl esters with short-and medium-chain lengths.The unique characteristics of Lip4346 indicate that it is a promising nonaqueous biocatalyst for industrial applications.展开更多
Beneficial microorganisms were extracted from municipal solid waste compost and treated under low temperature stress to prepare complex microbial inoc- ulants. Turfgrass was inoculated with the prepared microbial inoc...Beneficial microorganisms were extracted from municipal solid waste compost and treated under low temperature stress to prepare complex microbial inoc- ulants. Turfgrass was inoculated with the prepared microbial inoculants to investigate the ecological effect of ~crobial inoculants on turf storage in winter. The re- suits showed that complex low temperature tolerant microbial inoculants significandy improved plant height and aboveground biomass of turfgrass. Compared with the non-inoculated control, plant height and biomass of the first batch of inoculated turfgrass were enhanced by 6.47% and 14.32%, respectively; and they were en- hanced by 6.94% and 17.41%, respectively, for the second batch of inoculated turfgrass. Under low temperature stress in winter, the reviving rate of inoculated tarfgrass was significandy higher than that of control, which was improved by 3.34% and 43.33% for the first and second batches of inoculated turfgrass respective- ly. After low temperature storage in winter, inoculated turfgrass revived in advance; specifically, the reviving date of the second batch of inoculated turfgrass was 3 d earlier than that of control. This low temperature tolerant microbial consortium was effective for turfgrass as an ecofriendly and acceptable technology to improve plant performance and development in winter and accelerate time to market of turf.展开更多
Embracing ultrahigh theoretical capacity of 3860 mA h g^(-1)and the lowest reduction potential of-3.04 V(versus standard hydrogen electrode),lithium(Li) is considered as the "holy grail" material for pursuin...Embracing ultrahigh theoretical capacity of 3860 mA h g^(-1)and the lowest reduction potential of-3.04 V(versus standard hydrogen electrode),lithium(Li) is considered as the "holy grail" material for pursuing higher energy density,of which application has been challenged due to the unstable interface caused by the non-uniform electrodeposition as well as high chemical activity.Operating at higher temperature can be recommended to uniform electrodeposition of Li metal.Nevertheless,the intrinsic side-reaction between Li metal anode and electrolyte is inevitably aggravated and thus fosters the failure of Li metal anode rapidly with uneven electrodeposition.Here,a kind of temperature-tolerated ionic liquid(1-methyl-3-ethylimidazole bis(fluorosulfo nyl)imide/lithium bis(trifluoromethylsulfo nyl)imide,EF/LT)based electrolyte that matrixed with poly(vinylidene fluoride-hexafluoropropylene) was designed to maintain the interfacial stabilization of Li metal due to the weak interfacial reaction and uniform electrodeposition at high temperature of 80℃.It is the matter that the 660-h cycle with lower polarization is achieved with EF/LT-based electrolyte at temperature of 80 ℃ and the full cell embraces outstanding cyclic performance,without capacity fading within 100 cycles.Delighting,a door for practical application of Li metal anode for higher energy density as the carbon neutrality progresses in the blooming human society has been opened gradually.展开更多
在中低渗透高温高盐油藏聚合物驱技术中,超高相对分子质量聚丙烯酰胺(HPAM)存在不易注入、剪切降粘显著和耐温抗盐性能差等问题。本文以丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,采用过硫酸胺(NH4)2S2O8和甲基丙烯酸N,N-...在中低渗透高温高盐油藏聚合物驱技术中,超高相对分子质量聚丙烯酰胺(HPAM)存在不易注入、剪切降粘显著和耐温抗盐性能差等问题。本文以丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,采用过硫酸胺(NH4)2S2O8和甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA)作为支化结构复合引发体系,通过共聚后水解工艺,合成含支化结构耐温抗盐驱油共聚物P(AM/AMPSNa/AANa)。研究了引发温度、链转移剂用量、引发剂用量对共聚物特性黏数的影响,并通过红外光谱(IR)和13C NMR表征了产物结构。筛选特性黏数1915 m L/g左右的共聚物,进行性能评价。实验结果表明,共聚物具有优异的耐温抗盐性能、抗剪切性能、抗老化性、注入性和驱油性能,可应用在中低渗透高温高盐油藏三次采油中。展开更多
基金financially supported by the China Ocean Mineral Resources R&D Association project(No.DY 135-B2-11)the China-ASEAN Maritime Cooperation Fund。
文摘A novel lipase gene(lip4346)encoding a primary translation product with 176 amino acids was screened from the genome fine mapping of the macroalgae-associated bacterial strain Microbulbifer sp.YNDZ01.Macroalgae were collected from the coast of the Halmahera Island of Indonesia.The lip4346 gene was cloned and heterologously expressed in Escherichia coli.The purified recombinant Lip4346 protein had a molecular mass of 19 k Da,a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE),and a maximum enzyme activity of 31.2 U m L-1.The optimal temperature and pH for the lipase activity of Lip4346 were 70℃and 10.0,respectively.Lip4346 was tolerant with a number of organic solvents and detergents,and was active toward triacylglycerols and p-nitrophenyl esters with short-and medium-chain lengths.The unique characteristics of Lip4346 indicate that it is a promising nonaqueous biocatalyst for industrial applications.
基金Supported by Key Science and Technology Support Program of Tianjin Municipality(13ZCZDNC00200)
文摘Beneficial microorganisms were extracted from municipal solid waste compost and treated under low temperature stress to prepare complex microbial inoc- ulants. Turfgrass was inoculated with the prepared microbial inoculants to investigate the ecological effect of ~crobial inoculants on turf storage in winter. The re- suits showed that complex low temperature tolerant microbial inoculants significandy improved plant height and aboveground biomass of turfgrass. Compared with the non-inoculated control, plant height and biomass of the first batch of inoculated turfgrass were enhanced by 6.47% and 14.32%, respectively; and they were en- hanced by 6.94% and 17.41%, respectively, for the second batch of inoculated turfgrass. Under low temperature stress in winter, the reviving rate of inoculated tarfgrass was significandy higher than that of control, which was improved by 3.34% and 43.33% for the first and second batches of inoculated turfgrass respective- ly. After low temperature storage in winter, inoculated turfgrass revived in advance; specifically, the reviving date of the second batch of inoculated turfgrass was 3 d earlier than that of control. This low temperature tolerant microbial consortium was effective for turfgrass as an ecofriendly and acceptable technology to improve plant performance and development in winter and accelerate time to market of turf.
基金financially supported by the Natural Science Foundation of Hunan Province(2020JJ5653)the National Natural Science Foundation of China(21875282,22102212)+1 种基金the National University of Defense Technology Scientific Research Project(ZK20-44)financial support from the Ministry of Science and Higher Education of the Russian Federation(075-15-2022-1150)。
文摘Embracing ultrahigh theoretical capacity of 3860 mA h g^(-1)and the lowest reduction potential of-3.04 V(versus standard hydrogen electrode),lithium(Li) is considered as the "holy grail" material for pursuing higher energy density,of which application has been challenged due to the unstable interface caused by the non-uniform electrodeposition as well as high chemical activity.Operating at higher temperature can be recommended to uniform electrodeposition of Li metal.Nevertheless,the intrinsic side-reaction between Li metal anode and electrolyte is inevitably aggravated and thus fosters the failure of Li metal anode rapidly with uneven electrodeposition.Here,a kind of temperature-tolerated ionic liquid(1-methyl-3-ethylimidazole bis(fluorosulfo nyl)imide/lithium bis(trifluoromethylsulfo nyl)imide,EF/LT)based electrolyte that matrixed with poly(vinylidene fluoride-hexafluoropropylene) was designed to maintain the interfacial stabilization of Li metal due to the weak interfacial reaction and uniform electrodeposition at high temperature of 80℃.It is the matter that the 660-h cycle with lower polarization is achieved with EF/LT-based electrolyte at temperature of 80 ℃ and the full cell embraces outstanding cyclic performance,without capacity fading within 100 cycles.Delighting,a door for practical application of Li metal anode for higher energy density as the carbon neutrality progresses in the blooming human society has been opened gradually.
文摘在中低渗透高温高盐油藏聚合物驱技术中,超高相对分子质量聚丙烯酰胺(HPAM)存在不易注入、剪切降粘显著和耐温抗盐性能差等问题。本文以丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,采用过硫酸胺(NH4)2S2O8和甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA)作为支化结构复合引发体系,通过共聚后水解工艺,合成含支化结构耐温抗盐驱油共聚物P(AM/AMPSNa/AANa)。研究了引发温度、链转移剂用量、引发剂用量对共聚物特性黏数的影响,并通过红外光谱(IR)和13C NMR表征了产物结构。筛选特性黏数1915 m L/g左右的共聚物,进行性能评价。实验结果表明,共聚物具有优异的耐温抗盐性能、抗剪切性能、抗老化性、注入性和驱油性能,可应用在中低渗透高温高盐油藏三次采油中。
