Transient memories,which can physically disappear without leaving traceable remains over a period of normal operation,are attracting increasing attention for potential applications in the fields of data security and g...Transient memories,which can physically disappear without leaving traceable remains over a period of normal operation,are attracting increasing attention for potential applications in the fields of data security and green electronics.Resistive random access memory(RRAM)is a promising candidate for next-generation memory.In this context,biocompatible l-carrageenan(l-car),extracted from natural seaweed,is introduced for the fabrication of RRAM devices(Ag/l-car/Pt).Taking advantage of the complexation processes between the functional groups(C–O–C,C–O–H,et al.)and Ag metal ions,a lower migration barrier of Ag ions and a high-speed switching(22.2 ns for SET operation/26 ns for RESET operation)were achieved,resulting in an ultralow power consumption of 56 fJ.And the prepared Ag/l-car/Pt RRAM devices also revealed the capacities of multilevel storage and flexibility.In addition,thanks to the hydrophilic groups of l-car molecule,the RRAM devices can be rapidly dissolved in deionized(DI)water within 13 minutes,showing excellent transient characteristics.This work demonstrates that l-car based RRAM devices have great potential for applications in secure storage applications,flexible electronics and transient electronics.展开更多
In this study,we investigated whether two brain regions,the bed nucleus of the stria terminalis(BNST)and the basolateral amygdala(BLA),affected male rats(Rattus norvigicus)ability to innately discriminate between a pr...In this study,we investigated whether two brain regions,the bed nucleus of the stria terminalis(BNST)and the basolateral amygdala(BLA),affected male rats(Rattus norvigicus)ability to innately discriminate between a predator odor(cat urine)and female rat urine.Muscimol,a GABAa receptor agonist,was bilaterally microinjected into either the BNST or BLA of rats through展开更多
Salecan is a novel exopolysaccharide produced by the strain Agrobacterium sp. 7__X09, and it is composed of only glucose monomers. The unique chemical composition and excellent physicochemical properties make Salecan ...Salecan is a novel exopolysaccharide produced by the strain Agrobacterium sp. 7__X09, and it is composed of only glucose monomers. The unique chemical composition and excellent physicochemical properties make Salecan a promising material for applications in coagulation, lubrication, protection against acute liver injury, and alleviating constipation. In this study, we cloned the Vitreosci/la hemoglobin gene into a broad-host-range plasmid pCM158. Without antibiotic selection, there was negligible loss of the plasmid in the host Agrobacterium sp. ZX09 after one passage of cultivation. The expression of Vitreoscilla hemoglobin was demonstrated by carbon monoxide （CO） dif- ference spectrum. The engineered strain Agrobacterium sp. ZX09 increased Salecan yield by 30%. The other physi- ological changes included its elevated respiration rate and cellular invertase activity.展开更多
Aims The relationships between plant species and soil microorganisms remain indeterminable in different ecosystems worldwide.In karst ecosystems,soil microbial(SM)community structure and their environmental driving fa...Aims The relationships between plant species and soil microorganisms remain indeterminable in different ecosystems worldwide.In karst ecosystems,soil microbial(SM)community structure and their environmental driving factors are poorly explored,and the relationships between plant species and soil microorganisms are unclear.This study aimed to characterize the general patterns of SM community composition and biomass,and to explore the specific tree species and soil physiochemical properties highly related to SM community diversity and biomass in a karst forest.Methods The effects of tree species on SM community composition and biomass were firstly investigated on the basis of 212 soil samples collected from five dominant tree species(Lithocarpus confinis Huang,Platycarya longipes Wu,Itea yunnanensis Franch.,Machilus cavaleriei H.Lév.and Carpinus pubescens Burkill)through phospholipid fatty acid(PLFA)analysis of a karst evergreen and deciduous broad-leaved mixed forest in central Guizhou Province,southwestern China.The relationships between SM community structure and tree species and soil physiochemical properties were statistically analysed.Important Findings A total of 132 SM-PLFA biomarkers were detected.The average number of SM-PLFA biomarkers and microbial biomass in each soil sample were 65.97 and 11.22µg g^(–1),respectively.Tree species influenced the number of SM-PLFA biomarkers but not the SM biomass.The number of SM-PLFA biomarkers of C.pubescens was significantly higher than that of other species(P<0.05);the numbers of SM-PLFA biomarkers amongst other species showed no significant difference.Microbial biomass showed no relationships with the soil physiochemical properties of nutrient-rich surface soils but positively correlated(P<0.05)with soil organic carbon,nitrogen and phosphorus concentrations in deeper soils.The karst forest in the plateau-surface terrain of central Guizhou Province presented a low fungal-to-bacterial ratio,low microbial biomass storage and high microbial community diversity.Specific tree species affect the SM community diversity in this kind of karst forest.展开更多
基金supported financially by the National Key Research and Development Program of China(Grant No.2023YFB4402301)the National Science Fund for Distinguished Young Scholars(Grant No.52025022)+3 种基金the National Natural Science Foundation of China(Grant Nos.U19A2091,62004016,51732003,52072065,11974072,52372137,and 52272140)the“111”Project(Grant No.B13013)the Fundamental Research Funds for the Central Universities(Grant Nos.2412022QD036 and 2412023YQ004)the funding from Jilin Province(Grant Nos.20210201062GX,20220502002GH,20230402072GH,20230101017JC,and 20210509045RQ)。
文摘Transient memories,which can physically disappear without leaving traceable remains over a period of normal operation,are attracting increasing attention for potential applications in the fields of data security and green electronics.Resistive random access memory(RRAM)is a promising candidate for next-generation memory.In this context,biocompatible l-carrageenan(l-car),extracted from natural seaweed,is introduced for the fabrication of RRAM devices(Ag/l-car/Pt).Taking advantage of the complexation processes between the functional groups(C–O–C,C–O–H,et al.)and Ag metal ions,a lower migration barrier of Ag ions and a high-speed switching(22.2 ns for SET operation/26 ns for RESET operation)were achieved,resulting in an ultralow power consumption of 56 fJ.And the prepared Ag/l-car/Pt RRAM devices also revealed the capacities of multilevel storage and flexibility.In addition,thanks to the hydrophilic groups of l-car molecule,the RRAM devices can be rapidly dissolved in deionized(DI)water within 13 minutes,showing excellent transient characteristics.This work demonstrates that l-car based RRAM devices have great potential for applications in secure storage applications,flexible electronics and transient electronics.
文摘In this study,we investigated whether two brain regions,the bed nucleus of the stria terminalis(BNST)and the basolateral amygdala(BLA),affected male rats(Rattus norvigicus)ability to innately discriminate between a predator odor(cat urine)and female rat urine.Muscimol,a GABAa receptor agonist,was bilaterally microinjected into either the BNST or BLA of rats through
基金supported by the Fundamental Research Funds for the Central Universities of China(No.30920130121013)the National Natural Science Foundation of China(No.31300111)
文摘Salecan is a novel exopolysaccharide produced by the strain Agrobacterium sp. 7__X09, and it is composed of only glucose monomers. The unique chemical composition and excellent physicochemical properties make Salecan a promising material for applications in coagulation, lubrication, protection against acute liver injury, and alleviating constipation. In this study, we cloned the Vitreosci/la hemoglobin gene into a broad-host-range plasmid pCM158. Without antibiotic selection, there was negligible loss of the plasmid in the host Agrobacterium sp. ZX09 after one passage of cultivation. The expression of Vitreoscilla hemoglobin was demonstrated by carbon monoxide （CO） dif- ference spectrum. The engineered strain Agrobacterium sp. ZX09 increased Salecan yield by 30%. The other physi- ological changes included its elevated respiration rate and cellular invertase activity.
基金the National Basic Research Program of China(2016YFC0502304,2018YFC0507203,2016YFC0502101)the National Science Foundation of China(31870462)and the Natural Science Foundation of Zhejiang Province(LQ20C030003).
文摘Aims The relationships between plant species and soil microorganisms remain indeterminable in different ecosystems worldwide.In karst ecosystems,soil microbial(SM)community structure and their environmental driving factors are poorly explored,and the relationships between plant species and soil microorganisms are unclear.This study aimed to characterize the general patterns of SM community composition and biomass,and to explore the specific tree species and soil physiochemical properties highly related to SM community diversity and biomass in a karst forest.Methods The effects of tree species on SM community composition and biomass were firstly investigated on the basis of 212 soil samples collected from five dominant tree species(Lithocarpus confinis Huang,Platycarya longipes Wu,Itea yunnanensis Franch.,Machilus cavaleriei H.Lév.and Carpinus pubescens Burkill)through phospholipid fatty acid(PLFA)analysis of a karst evergreen and deciduous broad-leaved mixed forest in central Guizhou Province,southwestern China.The relationships between SM community structure and tree species and soil physiochemical properties were statistically analysed.Important Findings A total of 132 SM-PLFA biomarkers were detected.The average number of SM-PLFA biomarkers and microbial biomass in each soil sample were 65.97 and 11.22µg g^(–1),respectively.Tree species influenced the number of SM-PLFA biomarkers but not the SM biomass.The number of SM-PLFA biomarkers of C.pubescens was significantly higher than that of other species(P<0.05);the numbers of SM-PLFA biomarkers amongst other species showed no significant difference.Microbial biomass showed no relationships with the soil physiochemical properties of nutrient-rich surface soils but positively correlated(P<0.05)with soil organic carbon,nitrogen and phosphorus concentrations in deeper soils.The karst forest in the plateau-surface terrain of central Guizhou Province presented a low fungal-to-bacterial ratio,low microbial biomass storage and high microbial community diversity.Specific tree species affect the SM community diversity in this kind of karst forest.
