The chloroplast NADH dehydrogenase-like(NDH)complex,homologous to respiratory complex I,participates in photosystem I cyclic electron flow(PSI-CEF)and chlororespiration in photosynthesis.Phylogenetic analyses indicate...The chloroplast NADH dehydrogenase-like(NDH)complex,homologous to respiratory complex I,participates in photosystem I cyclic electron flow(PSI-CEF)and chlororespiration in photosynthesis.Phylogenetic analyses indicated that Zostera marina,a widely distributed seagrass,has a complete NDH complex,which is rarely observed in marine macrophytes.We identified all 31 ndh genes necessary for the functional NDH complex,of which ndhB and pnsb3 occurred as duplication events.Secondary structural analyses of antiporter-like subunits showed that the long amphipathic helix of NdhF was lost in Z.marina,which could exhibit an alternative mode in the generation of trans-thylakoid proton gradient.The splicing pattern of ndh exhibited tissue-specific patterns and responded to light stress.RNA editing in Z.marina presented the ancestral pattern with many of the primitive editing sites and types.The partial editing in ndhF reflected the link between light stress and RNA editing.Moreover,the predominant expression in leaves of most ndh genes suggested that their major function is in photosynthesis.The quantitative real time-PCR results show that the expression of ndh was signifi cantly upregulated in response to light stress.Nevertheless,there were two diverse responsive mechanisms of the NDH complex in PSI-CEF and chlororespiration.Overall,the presence of a complete structure,upregulated gene expression level,and multiple post-transcriptional regulations could provide a molecular basis for the powerful NDH complex and enable Z.marina to maintain eff ective photosynthetic performance.展开更多
The coupling of washing with adsorption process can be adopted for the treatment of soils contaminated with heavy metals pollution.However,the complex environment of soil and the competitive behavior of leaching chemi...The coupling of washing with adsorption process can be adopted for the treatment of soils contaminated with heavy metals pollution.However,the complex environment of soil and the competitive behavior of leaching chemicals considerably restrain adsorption capacity of adsorbent material during washing process,which demands a higher resistance of the adsorbents to interference.In this study,we synthesized strongly magnetic,high specific surface area(573.49 m^(2)/g)UiO66 composites(i.e.,UiO66-Fe_(3)O_(4))using hydrothermal process.The UiO66-Fe_(3)O_(4) was applied as an adsorbent during the ethylene diamine tetraacetic acid(EDTA)-assisted washing process of contaminated soil.The incorporation of UiO66-Fe_(3)O_(4)results in rapid heavy metal removal and recovery from the soil under low concentrations of washing agent(0.001 mol/L)with reduced residual heavy metal mobility of soil after remediation.Furthermore,UiO66-Fe_(3)O_(4)can quickly recollect by an external magnet,which offers a simple and inexpensive recovery method for heavy metals from contaminated soil.Overall,UiO66-Fe_(3)O_(4)configuration with EDTA-assisted washing process showed opportunities for heavy metals contaminated sites.展开更多
This study is to combine geological analysis and processing methods with virtual reality.establishing a modeling to greatly improved the reliability and accuracy of geological description and discrimination in Traim B...This study is to combine geological analysis and processing methods with virtual reality.establishing a modeling to greatly improved the reliability and accuracy of geological description and discrimination in Traim Basin.To improve the accuracy of oil and gas exploration.展开更多
Organic mixed ionic-electronic conductor(OMIEC)polymers with the ability of mixed charge transport have been widely used in organic electronic devices,such as organic thermoelectric transistors(OTEs)and organic electr...Organic mixed ionic-electronic conductor(OMIEC)polymers with the ability of mixed charge transport have been widely used in organic electronic devices,such as organic thermoelectric transistors(OTEs)and organic electrochemical transistors(OECTs).The development of an n-type OMIEC remains a grand challenge.Herein,a double B←N bridged bipyridine unit with strong electron deficiency is used to build acceptor-acceptor type conjugated polymers(PBN-alkyl and PBN-OEG).PBN-OEG with oligoethylene glycol side chains exhibits weaker crystallinity,improved doping efficiency,and superior ion uptake capacity relative to the counterpart polymer with alkyl side chains.As a result,PBN-OEG exhibits a higher conductivity of 1.95 S cm-1,a better power factor of 4.7μW m-1 K-2 in OTEs,and a largeμC*of 2.6 F cm-1 V-1 s-1 in OECTs.Such results demonstrate the great potential of acceptor-acceptor type organoboron polymers for OMIEC materials.展开更多
Metal−organic frameworks(MOFs),such as HKUST-1,have been used in many applications such as catalysis,gas capture,and more.However,one major limitation hindering their application is inherent chemical instability,and c...Metal−organic frameworks(MOFs),such as HKUST-1,have been used in many applications such as catalysis,gas capture,and more.However,one major limitation hindering their application is inherent chemical instability,and conducting in situ studies on their degradation with sufficient spatial-temporal resolution remains a challenge.In this work,we employ optical microscopy to quantitatively monitor the degradation of HKUST-1 under alkaline and acidic reducing environments with video-rate temporal resolution.By color-mapping the degradation progress over different time intervals with alkaline hole(h^(+))scavengers(sodium ascorbate,NaAs),we observe a sigmoidal time-dependent degradation trend.The results reveal the presence of confined regions with faster degradation.It is discovered that degradation begins with the chemical reduction of HKUST-1 into Cu_(2)O nanoparticles,followed by self-photoreduction into Cu_(2)O/Cu.Furthermore,it is observed that there is a h+scavenger concentration and laser-wavelength-dependent degradation.At higher concentrations and irradiation energy,there is faster degradation in the HKUST-1 framework.Under acidic reducing conditions with lactic acid(LA),the degradation rate constant is 22% higher than that under alkaline conditions,while the valence state of Cu remains unchanged.This can be attributed to distinct degradation mechanisms at different pH levels,in which acidolysis and metal−ligand disruption dominate in the presence of LA,while HKUST-1 degradation is primarily redox-driven in NaAs solution.These findings offer mechanistic insight into the degradation behavior of HKUST-1 and provide valuable guidance for optimizing MOF stability in practical applications.展开更多
The construction of a thin stable shell to encapsulate perovskite with effective carrier transport is a promising strategy to fabricate highly efficient and stable perovskite based optoelectronic devices.However,it is...The construction of a thin stable shell to encapsulate perovskite with effective carrier transport is a promising strategy to fabricate highly efficient and stable perovskite based optoelectronic devices.However,it is generally difficult to control the thickness and location of the encapsulating materials,ideally on perovskite grains.In this work,we developed a one-step method for the growth of titanium alkoxide networks in-situ in perovskite film forming an encapsulating layer on perovskite nanograin homogeneously.The thin encapsulating network brings much enhanced stability and allows effective carrier transport simultaneously.Light emitting diode based on this composite shows much enhanced stability under continuous operation.展开更多
Sn-based perovskites are promising thin-film photovoltaic materials for their ideal bandgap and the eco-friendliness of Sn,but the performance of Sn-based perovskite solar cells is hindered by the short carrier diffus...Sn-based perovskites are promising thin-film photovoltaic materials for their ideal bandgap and the eco-friendliness of Sn,but the performance of Sn-based perovskite solar cells is hindered by the short carrier diffusion length and large defect density in nominally-synthesized Sn-based perovskite films.Herein we demonstrate that a long carrier diffusion length is achievable in quasi-2D Sn-based perovskite films consisting of high-member low-dimensional Ruddlesden-Popper(RP)phases with a preferred crystal orientation distribution.The key to the film synthesis is the use of a molecular additive formed by phenylethylammonium cations and optimally mixed halide-pseudohalide anions,which favorably tailors the quasi-2D Sn-based perovskite crystallization kinetics.The high-member RP film structure effectively enhances device short-circuit current density,giving rise to an increased power conversion efficiency(PCE)of 14.6%.The resulting device demonstrates a near-unity shelf stability upon1,000 h in nitrogen.A high reproductivity is also achieved with a count of 50 devices showing PCEs within a narrow range from minimum 13.0%to maximum 14.6%.展开更多
基金Supported by the National Natural Science Foundation of China(No.41376154)the Yantai Municipal Key Research and Development Project(No.2019XDHZ096)。
文摘The chloroplast NADH dehydrogenase-like(NDH)complex,homologous to respiratory complex I,participates in photosystem I cyclic electron flow(PSI-CEF)and chlororespiration in photosynthesis.Phylogenetic analyses indicated that Zostera marina,a widely distributed seagrass,has a complete NDH complex,which is rarely observed in marine macrophytes.We identified all 31 ndh genes necessary for the functional NDH complex,of which ndhB and pnsb3 occurred as duplication events.Secondary structural analyses of antiporter-like subunits showed that the long amphipathic helix of NdhF was lost in Z.marina,which could exhibit an alternative mode in the generation of trans-thylakoid proton gradient.The splicing pattern of ndh exhibited tissue-specific patterns and responded to light stress.RNA editing in Z.marina presented the ancestral pattern with many of the primitive editing sites and types.The partial editing in ndhF reflected the link between light stress and RNA editing.Moreover,the predominant expression in leaves of most ndh genes suggested that their major function is in photosynthesis.The quantitative real time-PCR results show that the expression of ndh was signifi cantly upregulated in response to light stress.Nevertheless,there were two diverse responsive mechanisms of the NDH complex in PSI-CEF and chlororespiration.Overall,the presence of a complete structure,upregulated gene expression level,and multiple post-transcriptional regulations could provide a molecular basis for the powerful NDH complex and enable Z.marina to maintain eff ective photosynthetic performance.
基金supported by the University Basic Research Fund of China(No.2232020A-10)the Joint Foundation of Iron and Steel,National Natural Science Foundation of China(No.U1660107)。
文摘The coupling of washing with adsorption process can be adopted for the treatment of soils contaminated with heavy metals pollution.However,the complex environment of soil and the competitive behavior of leaching chemicals considerably restrain adsorption capacity of adsorbent material during washing process,which demands a higher resistance of the adsorbents to interference.In this study,we synthesized strongly magnetic,high specific surface area(573.49 m^(2)/g)UiO66 composites(i.e.,UiO66-Fe_(3)O_(4))using hydrothermal process.The UiO66-Fe_(3)O_(4) was applied as an adsorbent during the ethylene diamine tetraacetic acid(EDTA)-assisted washing process of contaminated soil.The incorporation of UiO66-Fe_(3)O_(4)results in rapid heavy metal removal and recovery from the soil under low concentrations of washing agent(0.001 mol/L)with reduced residual heavy metal mobility of soil after remediation.Furthermore,UiO66-Fe_(3)O_(4)can quickly recollect by an external magnet,which offers a simple and inexpensive recovery method for heavy metals from contaminated soil.Overall,UiO66-Fe_(3)O_(4)configuration with EDTA-assisted washing process showed opportunities for heavy metals contaminated sites.
文摘This study is to combine geological analysis and processing methods with virtual reality.establishing a modeling to greatly improved the reliability and accuracy of geological description and discrimination in Traim Basin.To improve the accuracy of oil and gas exploration.
基金support from the National Natural Science Foundation of China(Nos.52273201,52473199)J.L.thanks the Jilin Scientific and Technological Development Program(No.20230402070GH)+1 种基金a grant for Distinguished Young Scholars of the National Natural Science Foundation of China(Overseas)A portion of this work is based on the data obtained at BSRF-1W1A.The authors gratefully acknowledge the cooperation of the beamline scientists at the BSRF-1W1A beamline.
文摘Organic mixed ionic-electronic conductor(OMIEC)polymers with the ability of mixed charge transport have been widely used in organic electronic devices,such as organic thermoelectric transistors(OTEs)and organic electrochemical transistors(OECTs).The development of an n-type OMIEC remains a grand challenge.Herein,a double B←N bridged bipyridine unit with strong electron deficiency is used to build acceptor-acceptor type conjugated polymers(PBN-alkyl and PBN-OEG).PBN-OEG with oligoethylene glycol side chains exhibits weaker crystallinity,improved doping efficiency,and superior ion uptake capacity relative to the counterpart polymer with alkyl side chains.As a result,PBN-OEG exhibits a higher conductivity of 1.95 S cm-1,a better power factor of 4.7μW m-1 K-2 in OTEs,and a largeμC*of 2.6 F cm-1 V-1 s-1 in OECTs.Such results demonstrate the great potential of acceptor-acceptor type organoboron polymers for OMIEC materials.
基金support from the Ministry of Education,Singapore,under its Academic Research Fund Tier 1(No.RG60/21,RG1/23,RG9/24)the Singapore Agency for Science,Technology and Research(A*STAR)MTC IRG grant(No.M21K2c0110).
文摘Metal−organic frameworks(MOFs),such as HKUST-1,have been used in many applications such as catalysis,gas capture,and more.However,one major limitation hindering their application is inherent chemical instability,and conducting in situ studies on their degradation with sufficient spatial-temporal resolution remains a challenge.In this work,we employ optical microscopy to quantitatively monitor the degradation of HKUST-1 under alkaline and acidic reducing environments with video-rate temporal resolution.By color-mapping the degradation progress over different time intervals with alkaline hole(h^(+))scavengers(sodium ascorbate,NaAs),we observe a sigmoidal time-dependent degradation trend.The results reveal the presence of confined regions with faster degradation.It is discovered that degradation begins with the chemical reduction of HKUST-1 into Cu_(2)O nanoparticles,followed by self-photoreduction into Cu_(2)O/Cu.Furthermore,it is observed that there is a h+scavenger concentration and laser-wavelength-dependent degradation.At higher concentrations and irradiation energy,there is faster degradation in the HKUST-1 framework.Under acidic reducing conditions with lactic acid(LA),the degradation rate constant is 22% higher than that under alkaline conditions,while the valence state of Cu remains unchanged.This can be attributed to distinct degradation mechanisms at different pH levels,in which acidolysis and metal−ligand disruption dominate in the presence of LA,while HKUST-1 degradation is primarily redox-driven in NaAs solution.These findings offer mechanistic insight into the degradation behavior of HKUST-1 and provide valuable guidance for optimizing MOF stability in practical applications.
基金the National Key Research and Development Program of China(No.2021YFA0715502)the National Natural Science Foundation of China(Nos.61935016,92056119,22175118,and 62004125)+3 种基金Science and Technology Commission of Shanghai Municipality(Nos.20JC1415800 and 20XD1402500)the Double First-Class Initiative Fund of ShanghaiTech University and Open Research Fund of China National Key Laboratory of Materials for Integrated Circuits(No.NKLJC-K2023-04)support from Analytical Instrumentation Center(#SPST-AIC10112914),SPST,ShanghaiTech Universitythe support from Centre for High-resolution Electron Microscopy(ChEM),SPST,ShanghaiTech University under contract NO.EM02161943.
文摘The construction of a thin stable shell to encapsulate perovskite with effective carrier transport is a promising strategy to fabricate highly efficient and stable perovskite based optoelectronic devices.However,it is generally difficult to control the thickness and location of the encapsulating materials,ideally on perovskite grains.In this work,we developed a one-step method for the growth of titanium alkoxide networks in-situ in perovskite film forming an encapsulating layer on perovskite nanograin homogeneously.The thin encapsulating network brings much enhanced stability and allows effective carrier transport simultaneously.Light emitting diode based on this composite shows much enhanced stability under continuous operation.
基金financially supported from the National Key Research and Development Program of China(2021YFA0715502)the National Natural Science Foundation of China(61935016,92056119,22175118)+9 种基金the Science and Technology Commission of Shanghai Municipality(20XD1402500,20JC1415800)Shanghai Tech start-up fundingthe Early Career Scheme(22300221)from the Hong Kong Research Grant Councilthe Excellent Young Scientists Funds(52222318)from National Natural Science Foundation of Chinathe start-up grants,the Initiation Grant-Faculty Niche Research Areas(IG-FNRA)2020/21the Interdisciplinary Research Matching Scheme(IRMS)2020/21 of Hong Kong Baptist Universitysupport from the Hong Kong Research Grant Council(16302520)Seed Funding from the University Research Committee(URC)of the University of Hong Kongpartially supported by the Centre for High-Resolution Electron Microscopy(ChEM),SPST,Shanghai Tech University under contract No.EM02161943the Analytical Instrumentation Center,SPST,Shanghai Tech University under contract No.SPST-AIC10112914。
文摘Sn-based perovskites are promising thin-film photovoltaic materials for their ideal bandgap and the eco-friendliness of Sn,but the performance of Sn-based perovskite solar cells is hindered by the short carrier diffusion length and large defect density in nominally-synthesized Sn-based perovskite films.Herein we demonstrate that a long carrier diffusion length is achievable in quasi-2D Sn-based perovskite films consisting of high-member low-dimensional Ruddlesden-Popper(RP)phases with a preferred crystal orientation distribution.The key to the film synthesis is the use of a molecular additive formed by phenylethylammonium cations and optimally mixed halide-pseudohalide anions,which favorably tailors the quasi-2D Sn-based perovskite crystallization kinetics.The high-member RP film structure effectively enhances device short-circuit current density,giving rise to an increased power conversion efficiency(PCE)of 14.6%.The resulting device demonstrates a near-unity shelf stability upon1,000 h in nitrogen.A high reproductivity is also achieved with a count of 50 devices showing PCEs within a narrow range from minimum 13.0%to maximum 14.6%.
