The kagome superconductor CsV_(3)Sb_(5) with exotic electronic properties has attracted substantial research interest,and the interplay between the superconductivity and the charge-density wave is crucial for understa...The kagome superconductor CsV_(3)Sb_(5) with exotic electronic properties has attracted substantial research interest,and the interplay between the superconductivity and the charge-density wave is crucial for understanding its unusual electronic ground state.In this work,we performed resistivity and AC magnetic susceptibility measurements on CsV_(3)Sb_(5) single crystals uniaxially-strained along[100]and[110]directions.We find that the uniaxial-strain tuning effect of T_(c)(dT_(c)/dε)and T_(CDW)(dT_(CDW)/dε)are almost identical along these distinct high-symmetry directions.These findings suggest the in-plane uniaxial-strain-tuning of T_(c) and T_(CDW)in CsV_(3)Sb_(5) are dominated by associated c-axis strain,whereas the response to purely in-plane strains is likely small.展开更多
A highly-controllable core-shell silica-MIPs absorbent by anchoring a MIPs layer to the surface of SiO2 nanoparticles via a surface molecular imprinting process was prepared. The templates were covalently modified wit...A highly-controllable core-shell silica-MIPs absorbent by anchoring a MIPs layer to the surface of SiO2 nanoparticles via a surface molecular imprinting process was prepared. The templates were covalently modified with functional monomers to form precursor EstSi. The latter together with coupling reagent KH-570, were grafted onto the surface of SiO2 nanoparticles before polymerization, to ensure the quantity and quality of imprinted sites on the surface of the covalently attached matrix. The as-synthesized core-shell nanomaterials (SiO2@MIP2) were then evaluated for selective adsorption of 17β-estradiol (E2) with Raman spectra as detection method. The results indicate that SiO2@MIP2 can fast and selectively adsorb E2 from structural analogues, with detection limit of 0.01 μmol/l.展开更多
Soil is the most biologically abundant ecosystem on the earth.Soil biodiversity has significant impact on maintaining soil ecological balance and agricultural production,especially on healthy growth and disease contro...Soil is the most biologically abundant ecosystem on the earth.Soil biodiversity has significant impact on maintaining soil ecological balance and agricultural production,especially on healthy growth and disease control of plants.Therefore,it is of great significance to study soil biodiversity.This paper reviewed the role of soil biodiversity in plant growth.First of all,the history of soil biodiversity was introduced.Secondly,the composition of soil biodiversity was introduced,and the role of soil biodiversity in regulating the quantity and species of soil organisms,maintaining the balance and stability of soil system,participating in nutrient circulation and energy flow,and promoting plant health were discussed based on the interactions among microbial diversity,fauna diversity and plant diversity.Finally,combined with the background of advocating the protection of soil biodiversity in the great time,the potential factors threatening soil biodiversity were analyzed.展开更多
A system which consists of a loading chamber unit, displacement sensor, data collector and processor, and a feedback control, was established for applying mechanical forces to single plant cells. The method works by c...A system which consists of a loading chamber unit, displacement sensor, data collector and processor, and a feedback control, was established for applying mechanical forces to single plant cells. The method works by compressing an agar cell-suspension block between parallel surfaces through using a force-feedback control circuit coupled to a microchip, delivering the pre-defined. The actual controlled stimulus is achieved whilst measuring the force being imposed on the cell, and its deformation. TheArabidopsisprotoplasts were utilized to test the system. It provides an experimental approach to investigate the mechanoresponses of plant cellsin vitroconditions.展开更多
Objective:To explore the therapeutic mechanism of microporous sheep acellular dermal matrix(ADM)combined with human umbilical cord mesenchymal stem cell(hUCMSC)to promote the healing of full-thickness skin defect.Meth...Objective:To explore the therapeutic mechanism of microporous sheep acellular dermal matrix(ADM)combined with human umbilical cord mesenchymal stem cell(hUCMSC)to promote the healing of full-thickness skin defect.Methods:hUCMSC was co-cultured on microporous sheep ADM to form composite biological dressings.Seventy-two nude mice were selected to make full-thickness skin injury models and randomly divided into 3 groups(hUCMSC+microporous sheep ADM group,sheep ADM group and iodophor gauze group),with 24 mice in each group.The wound healing rate of each group was detected at 14 d,21 d and 28 d after operation,qRT-PCR technique was used to detect the expression of Bax and Bcl-2 in the wound tissues,and the immunohistochemical staining technique was used to detect the expression of Collagen I and vascular endothelial growth factor(VEGF).Data were analyzed with one-way ANOVA and t test.Results:At 14 d after operation,the wound healing rate of the hUCMSC+microporous sheep ADM group was(65.34±14.72)%,which was significantly higher than that of the iodophor gauze group[(37.54±10.21)%],and higher than that of the sheep ADM group[(49.08±11.16)%],the differences were statistically significant(t=19.52,14.72;p<.05).With the gradual healing of the wound,at 28 d after operation,the wound healing rate of the hUCMSC+microporous sheep ADM group was(98.63±15.41)%,which was significantly higher than that of the iodophor gauze group[(81.74±16.27)%],and higher than that of the sheep ADM group[(63.47±14.80)%],the differences were statistically significant(t=-16.42,20.35;p<.05).The expression of Bax in the wound tissues of the hUCMSC+microporous sheep ADM group was significantly reduced,especially at 21 d after operation,the expression level was 0.25±0.06,which was significantly lower than the iodophor gauze group(0.53±0.16)and the sheep ADM group(0.41±0.12),the differences were statistically significant(t=3.52,-2.83;p<.05).The expression of Bcl-2 in the wound tissues of the hUCMSC+microporous sheep ADM group was significantly higher than those of the other two groups,especially at 21 d after operation,the expression level was 0.63±0.19,which was significantly higher than the iodophor gauze group(0.34±0.09)and the sheep ADM group(0.46±0.13),the differences were statistically significant(t=5.31,-6.07;p<.05).Immunohistochemical detection showed that the expression of Collagen I and VEGF in the hUCMSC+microporous sheep ADM group was slightly more than that of the sheep ADM group and the iodophor gauze group,but the effect was not remarkable.Conclusions:hUCMSC+microporous sheep ADM composite dressing can promote the healing of the full-thickness skin injury and reduce the production of apoptotic cells by carrying hUCMSC.展开更多
Evaluation of the effectiveness of refuge strategies involved in cotton boll- worm Bt resistance management would be aided by technologies that allow monitoring and quantification of key factors that affect the proces...Evaluation of the effectiveness of refuge strategies involved in cotton boll- worm Bt resistance management would be aided by technologies that allow monitoring and quantification of key factors that affect the process under field conditions. We hy- pothesized that characterization of stable carbon and nitrogen isotopes in adult bollworm, Helicoverpa armigera （Htibner） （Lepidoptera： Noctuidae） moths may aid in determining the larval host that they developed upon. We found moths reared from larvae fed on peanut, soybean or cotton, respectively, could be differentiated using isotopic analyses that also corresponded to their respective larval host origins. These techniques were then used to classify feral second-generation bollworm moths caught in Bt cotton （Gossypium hirsu- rum） fields into different populations based on their isotopic signatures. In 2006-2007 feral moths captured in Bt cotton fields predominantly correlated with the peanut （Arachis hypogea） having served as their larval host, indicating this is the most important refuge crop for Bt-susceptible bollworm individuals （providing 58%-64% individuals） during independent moth peaks for the second generation in North China. The remaining feral moths correlated with soybean （Glycine max） （0-10%）; other C3 plant （20%-22%） and non-C3 plant （12%-14%） host types also provided some Bt-sensitive moths. Field obser- vations showed that peanut constitutes the primary refuge crop contributing to sustaining Bt-susceptible moths dispersing into cotton in North China. These results suggest that peanut may be a more effective refuge to sustain Bt-susceptible bollworm individuals and reduce the risk of development of a Bt-resistant biotype.展开更多
Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling lea...Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling leaf morphology,increasing photosynthesis efficiency and modulating the‘‘sink-source"relationship can promote the breeding of high-yield rice as well as other cereal crops[2–4].The morphology of the leaf includes length,width展开更多
This paper develops a multi-year lag Input-Holding-Output (I-H-O) Model on educationwith exclusion of the idle capital to address the reasonable education structure in support of a sus-tainable development strategy in...This paper develops a multi-year lag Input-Holding-Output (I-H-O) Model on educationwith exclusion of the idle capital to address the reasonable education structure in support of a sus-tainable development strategy in China.First,the model considers the multiyear lag of human capitalbecause the lag time of human capital is even longer and more important than that of fixed capital.Second,it considers the idle capital resulting from the output decline in education,for example,stu-dent decrease in primary school.The new generalized Leonitief dynamic inverse is deduced to obtain apositive solution on education when output declines as well as expands.After compiling the 2000 I-H-Otable on education,the authors adopt modifications-by-step method to treat nonlinear coefficients,andcalculate education scale,the requirement of human capital,and education expenditure from 2005 to2020.It is found that structural imbalance of human capital is a serious problem for Chinese economicdevelopment.展开更多
基金supported by the National Key Projects for Research and Development of China (Grant No.2021YFA1400400)the National Natural Science Foundation of China (Grant Nos.12174029 and 11922402)+3 种基金supported by the National Key Research and Development Program of China (Grant No.2022YFA1402200)the Pioneer and Leading Goose Research and Development Program of Zhejiang Province,China (Grant No.2022SDX-HDX0005)the Key Research and Development Program of Zhejiang Province,China (Grant No.2021C01002)the National Natural Science Foundation of China (Grant No.12274363)。
文摘The kagome superconductor CsV_(3)Sb_(5) with exotic electronic properties has attracted substantial research interest,and the interplay between the superconductivity and the charge-density wave is crucial for understanding its unusual electronic ground state.In this work,we performed resistivity and AC magnetic susceptibility measurements on CsV_(3)Sb_(5) single crystals uniaxially-strained along[100]and[110]directions.We find that the uniaxial-strain tuning effect of T_(c)(dT_(c)/dε)and T_(CDW)(dT_(CDW)/dε)are almost identical along these distinct high-symmetry directions.These findings suggest the in-plane uniaxial-strain-tuning of T_(c) and T_(CDW)in CsV_(3)Sb_(5) are dominated by associated c-axis strain,whereas the response to purely in-plane strains is likely small.
文摘A highly-controllable core-shell silica-MIPs absorbent by anchoring a MIPs layer to the surface of SiO2 nanoparticles via a surface molecular imprinting process was prepared. The templates were covalently modified with functional monomers to form precursor EstSi. The latter together with coupling reagent KH-570, were grafted onto the surface of SiO2 nanoparticles before polymerization, to ensure the quantity and quality of imprinted sites on the surface of the covalently attached matrix. The as-synthesized core-shell nanomaterials (SiO2@MIP2) were then evaluated for selective adsorption of 17β-estradiol (E2) with Raman spectra as detection method. The results indicate that SiO2@MIP2 can fast and selectively adsorb E2 from structural analogues, with detection limit of 0.01 μmol/l.
基金Supported by High-level Talents Program of Basic and Applied Basic Research Program of Hainan Province(2019RC332)。
文摘Soil is the most biologically abundant ecosystem on the earth.Soil biodiversity has significant impact on maintaining soil ecological balance and agricultural production,especially on healthy growth and disease control of plants.Therefore,it is of great significance to study soil biodiversity.This paper reviewed the role of soil biodiversity in plant growth.First of all,the history of soil biodiversity was introduced.Secondly,the composition of soil biodiversity was introduced,and the role of soil biodiversity in regulating the quantity and species of soil organisms,maintaining the balance and stability of soil system,participating in nutrient circulation and energy flow,and promoting plant health were discussed based on the interactions among microbial diversity,fauna diversity and plant diversity.Finally,combined with the background of advocating the protection of soil biodiversity in the great time,the potential factors threatening soil biodiversity were analyzed.
文摘A system which consists of a loading chamber unit, displacement sensor, data collector and processor, and a feedback control, was established for applying mechanical forces to single plant cells. The method works by compressing an agar cell-suspension block between parallel surfaces through using a force-feedback control circuit coupled to a microchip, delivering the pre-defined. The actual controlled stimulus is achieved whilst measuring the force being imposed on the cell, and its deformation. TheArabidopsisprotoplasts were utilized to test the system. It provides an experimental approach to investigate the mechanoresponses of plant cellsin vitroconditions.
文摘Objective:To explore the therapeutic mechanism of microporous sheep acellular dermal matrix(ADM)combined with human umbilical cord mesenchymal stem cell(hUCMSC)to promote the healing of full-thickness skin defect.Methods:hUCMSC was co-cultured on microporous sheep ADM to form composite biological dressings.Seventy-two nude mice were selected to make full-thickness skin injury models and randomly divided into 3 groups(hUCMSC+microporous sheep ADM group,sheep ADM group and iodophor gauze group),with 24 mice in each group.The wound healing rate of each group was detected at 14 d,21 d and 28 d after operation,qRT-PCR technique was used to detect the expression of Bax and Bcl-2 in the wound tissues,and the immunohistochemical staining technique was used to detect the expression of Collagen I and vascular endothelial growth factor(VEGF).Data were analyzed with one-way ANOVA and t test.Results:At 14 d after operation,the wound healing rate of the hUCMSC+microporous sheep ADM group was(65.34±14.72)%,which was significantly higher than that of the iodophor gauze group[(37.54±10.21)%],and higher than that of the sheep ADM group[(49.08±11.16)%],the differences were statistically significant(t=19.52,14.72;p<.05).With the gradual healing of the wound,at 28 d after operation,the wound healing rate of the hUCMSC+microporous sheep ADM group was(98.63±15.41)%,which was significantly higher than that of the iodophor gauze group[(81.74±16.27)%],and higher than that of the sheep ADM group[(63.47±14.80)%],the differences were statistically significant(t=-16.42,20.35;p<.05).The expression of Bax in the wound tissues of the hUCMSC+microporous sheep ADM group was significantly reduced,especially at 21 d after operation,the expression level was 0.25±0.06,which was significantly lower than the iodophor gauze group(0.53±0.16)and the sheep ADM group(0.41±0.12),the differences were statistically significant(t=3.52,-2.83;p<.05).The expression of Bcl-2 in the wound tissues of the hUCMSC+microporous sheep ADM group was significantly higher than those of the other two groups,especially at 21 d after operation,the expression level was 0.63±0.19,which was significantly higher than the iodophor gauze group(0.34±0.09)and the sheep ADM group(0.46±0.13),the differences were statistically significant(t=5.31,-6.07;p<.05).Immunohistochemical detection showed that the expression of Collagen I and VEGF in the hUCMSC+microporous sheep ADM group was slightly more than that of the sheep ADM group and the iodophor gauze group,but the effect was not remarkable.Conclusions:hUCMSC+microporous sheep ADM composite dressing can promote the healing of the full-thickness skin injury and reduce the production of apoptotic cells by carrying hUCMSC.
文摘Evaluation of the effectiveness of refuge strategies involved in cotton boll- worm Bt resistance management would be aided by technologies that allow monitoring and quantification of key factors that affect the process under field conditions. We hy- pothesized that characterization of stable carbon and nitrogen isotopes in adult bollworm, Helicoverpa armigera （Htibner） （Lepidoptera： Noctuidae） moths may aid in determining the larval host that they developed upon. We found moths reared from larvae fed on peanut, soybean or cotton, respectively, could be differentiated using isotopic analyses that also corresponded to their respective larval host origins. These techniques were then used to classify feral second-generation bollworm moths caught in Bt cotton （Gossypium hirsu- rum） fields into different populations based on their isotopic signatures. In 2006-2007 feral moths captured in Bt cotton fields predominantly correlated with the peanut （Arachis hypogea） having served as their larval host, indicating this is the most important refuge crop for Bt-susceptible bollworm individuals （providing 58%-64% individuals） during independent moth peaks for the second generation in North China. The remaining feral moths correlated with soybean （Glycine max） （0-10%）; other C3 plant （20%-22%） and non-C3 plant （12%-14%） host types also provided some Bt-sensitive moths. Field obser- vations showed that peanut constitutes the primary refuge crop contributing to sustaining Bt-susceptible moths dispersing into cotton in North China. These results suggest that peanut may be a more effective refuge to sustain Bt-susceptible bollworm individuals and reduce the risk of development of a Bt-resistant biotype.
基金supported by the National Key Research and Development Program (2016YFD0101801)the National Natural Science Foundation of China (31570184, 31770195, 91535205 and 31671666)
文摘Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling leaf morphology,increasing photosynthesis efficiency and modulating the‘‘sink-source"relationship can promote the breeding of high-yield rice as well as other cereal crops[2–4].The morphology of the leaf includes length,width
基金supporting by the Key Project of National Natural Science Foundation of China under Grant No. 60874119Innovation Funds of Chinese Academy of Sciences+6 种基金Research Fund for HurnanitiesSocial Sciences in colleges under Grant No. 06BJY102Key project in Jiangxi Soft Science Project under Grant No. [2006]188Jiangxi Research Fund for HumanitiesSocial Sciences in colleges under Grant No. 03J J01Henan Research Fund for HumanitiesSocial Sciences in colleges under Grant No. 2008-ZD-002
文摘This paper develops a multi-year lag Input-Holding-Output (I-H-O) Model on educationwith exclusion of the idle capital to address the reasonable education structure in support of a sus-tainable development strategy in China.First,the model considers the multiyear lag of human capitalbecause the lag time of human capital is even longer and more important than that of fixed capital.Second,it considers the idle capital resulting from the output decline in education,for example,stu-dent decrease in primary school.The new generalized Leonitief dynamic inverse is deduced to obtain apositive solution on education when output declines as well as expands.After compiling the 2000 I-H-Otable on education,the authors adopt modifications-by-step method to treat nonlinear coefficients,andcalculate education scale,the requirement of human capital,and education expenditure from 2005 to2020.It is found that structural imbalance of human capital is a serious problem for Chinese economicdevelopment.
