The revolution in information sharing is fundamentally supported by the highly efficient processing,storage,and transmission of data[1].For the latter,energy consumption continuously increases with the rapid developme...The revolution in information sharing is fundamentally supported by the highly efficient processing,storage,and transmission of data[1].For the latter,energy consumption continuously increases with the rapid development of information and communication technology[2].展开更多
Cancer cell membrane(CCM)derived nanotechnology functionalizes nanoparticles(NPs)to recognize homologous cells,exhibiting translational potential in accurate tumor therapy.However,these nanoplatforms are majorly gener...Cancer cell membrane(CCM)derived nanotechnology functionalizes nanoparticles(NPs)to recognize homologous cells,exhibiting translational potential in accurate tumor therapy.However,these nanoplatforms are majorly generated from fixed cell lines and are typically evaluated in cell line-derived subcutaneous-xenografts(CDX),ignoring the tumor heterogeneity and differentiation from inter-and intra-individuals and microenvironments between heterotopic-and orthotopic-tumors,limiting the therapeutic efficiency of such nanoplatforms.Herein,various biomimetic nanoplatforms(CCM-modified gold@Carbon,i.e.,Au@C-CCM)were fabricated by coating CCMs of head and neck squamous cell carcinoma(HNSCC)cell lines and patient-derived cells on the surface of Au@C NP.The generated Au@C-CCMs were evaluated on corresponding CDX,tongue orthotopic xenograft(TOX),immunecompetent primary and distant tumor models,and patient-derived xenograft(PDX)models.The Au@C-CCM generates a photothermal conversion efficiency up to 44.2% for primary HNSCC therapy and induced immunotherapy to inhibit metastasis via photothermal therapy-induced immunogenic cell death.The homologous CCM endowed the nanoplatforms with optimal targeting properties for the highest therapeutic efficiency,far above those with mismatched CCMs,resulting in distinct tumor ablation and tumor growth inhibition in all four models.This work reinforces the feasibility of biomimetic NPs combining modular designed CMs and functional cores for customized treatment of HNSCC,can be further extended to other malignant tumors therapy.展开更多
A highly efficient coupling reaction of N-heterocyclic carbene precursors with sulfonyl azides has been developed, affording a variety of pyrido[1,2-c][1,2,4]triazole-based π-conjugated triazenes. The present reactio...A highly efficient coupling reaction of N-heterocyclic carbene precursors with sulfonyl azides has been developed, affording a variety of pyrido[1,2-c][1,2,4]triazole-based π-conjugated triazenes. The present reaction proceeds under very mild conditions with good functional group tolerance. The resulting triazenes exhibit selective and sensitive fluorescent response toward Fe3+ion.展开更多
The electrochemical corrosion behavior of both (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets prepared with dual-main-phase method and N45-type magnets was studied in 3.5 wt% NaCl,1.1 wt% NaH_(2)PO_(4),and 2.5 w...The electrochemical corrosion behavior of both (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets prepared with dual-main-phase method and N45-type magnets was studied in 3.5 wt% NaCl,1.1 wt% NaH_(2)PO_(4),and 2.5 wt% NaOH solutions,respectively.The (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets perform superior corrosion resistance than N45-type magnets in the tested solutions.In general,two kinds of magnets exhibit the best corrosion resistance property in 2.5 wt% NaOH solution,while the worst in 3.5 wt% NaCl solution.Microstructures of samples before and after corrosion were investigated.With the addition of Ce by means of dual-main-phase method,which is conducive to facilitating low-temperature sintering and grain refinement,uniform grain size and(Nd,Ce)-rich phase distribution form,give rise to narrow and thin corrosion channels.Moreover,the corrosion rate of the(Nd,Ce)-rich phase is lower than that of Nd-rich one.Acco rdingly,corro sion re sistance of (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnet is superior when compared with the commercial N45-type magnet which has comparable magnetic properties.展开更多
The bacterium Avibacterium paragallinarum,previously known as Haemophilus paragallinarum,is responsible for caus-ing infectious coryza(IC)in chickens and other avian species.In this case report,an outbreak of Avibacte...The bacterium Avibacterium paragallinarum,previously known as Haemophilus paragallinarum,is responsible for caus-ing infectious coryza(IC)in chickens and other avian species.In this case report,an outbreak of Avibacterium paragal-linarum occurred in the Qinling area of China,resulting in clinical symptoms of facial swelling in several bird species,including Golden pheasant,Temminck's tragopan,and Peafowls,and three Golden pheasants died due to prolonged infection.Specific PCR results confrmed the presence of the pathogen in the infected birds.The report describes the clinical symptoms and pathological changes observed in the affected birds,as well as the isolation and identification of Avibacterium paragallinarum.Whole-genome sequencing and phylogenetic anal sis y were performed,and this is the frst report of inter-and intra-species transmission of infectious coryza among wild birds in China.展开更多
A tiny number of Zn atoms were deposited on Si(111)-(797) surface to study the evolution process of Zninduced nanoclusters. After the deposition, three types(type I, II, and III) of Zn-induced nanoclusters were observ...A tiny number of Zn atoms were deposited on Si(111)-(797) surface to study the evolution process of Zninduced nanoclusters. After the deposition, three types(type I, II, and III) of Zn-induced nanoclusters were observed to occupy preferably in the faulted half-unit cells. These Zn-induced nanoclusters are found to be related to one, two, and three displaced Si edge adatoms, and simultaneously cause the depression of one, two, and three closest Si edge adatoms in the neighboring unfaulted half-unit cells at negative voltages, respectively. First-principles adsorption energy calculations show that the observed type I, II, and III nanoclusters can reasonably be assigned as the Zn3Si1, Zn5Si2, and Zn7Si3 clusters,respectively. And Zn3Si1, Zn5Si2, and Zn7Si3 clusters are, respectively, the most stable structures in cases of one, two, and three displaced Si edge adatoms. Based on the above energy-preferred models, the simulated bias-dependent STM images are all well consistent with the experimental observations. Therefore, the most stable Zn7Si3 nanoclusters adsorbed on the Si(111)-(797) surface should grow up on the base of Zn3Si1 and Zn5Si2clusters. A novel evolution process from Zn3Si1 to Zn5Si2, and finally to Zn7Si3 nanocluster is unveiled.展开更多
Given a simple graph G,the oriented graph G^(σ)is obtained from G by orienting each edge and G is called the underlying graph of G^(σ).The skew-symmetric adjacency matrix S(G^(σ))of G^(σ),where the(u,v)-entry is 1...Given a simple graph G,the oriented graph G^(σ)is obtained from G by orienting each edge and G is called the underlying graph of G^(σ).The skew-symmetric adjacency matrix S(G^(σ))of G^(σ),where the(u,v)-entry is 1 if there is an arc from u to v,and−1 if there is an arc from v to u(and 0 otherwise),has eigenvalues of 0 or pure imaginary.The k-th-skew spectral moment of Gσis the sum of power k of all eigenvalues of S(G^(σ)),where k is a non-negative integer.The skew spectral moments can be used to produce graph catalogues.In this paper,we researched the skew spectral moments of some oriented trees and oriented unicyclic graphs and produced their catalogues in lexicographical order.We determined the last 2[d/4]oriented trees with underlying graph of diameter d and the last 2[g/4]+1 oriented unicyclic graphs with underlying graph of girth g,respectively.展开更多
[Objectives]To explore the effect of psoralen combined with paclitaxel on the apoptosis of MCF-7 cells.[Methods]The effects of different concentrations of psoralen,paclitaxel,or the combination of psoralen and paclita...[Objectives]To explore the effect of psoralen combined with paclitaxel on the apoptosis of MCF-7 cells.[Methods]The effects of different concentrations of psoralen,paclitaxel,or the combination of psoralen and paclitaxel on cell viability were detected using CCK-8 assay kit.Cell cycle distribution and apoptosis after 24 h of psoralen(0.16,0.32,0.64 mmol/L),paclitaxel(0.1μmol/L),combined action of psoralen(0.32 mmol/L)and paclitaxel(0.1μmol/L)were detected using flow cytometry.[Results]Lower concentration of psoralen(0.04-0.32 mmol/L)showed no significant inhibitory effect on cells.After combined with paclitaxel,the inhibitory effect on MCF-7 cell proliferation was significantly higher than that of the group treated alone.Compared with the paclitaxel group,the cell apoptosis rate in the drug combination group was significantly increased.Different low concentrations of psoralen can block the cell cycle of MCF-7 at G 0/G 1 phase,while paclitaxel can block the cell cycle at G 2/M phase.After combined action,the number of cells blocked at G 2/M phase decreased.[Conclusions]Overall,the combined effect of psoralen and paclitaxel can enhance anti-tumor ability by inhibiting cell proliferation,inducing apoptosis,and blocking cell cycle.展开更多
Achieving valley pseudospin with large polarization is crucial in the implementation of quantum information applications.Transition metal dichalcogenides(TMDC)with different phase structures provide an ideal platform ...Achieving valley pseudospin with large polarization is crucial in the implementation of quantum information applications.Transition metal dichalcogenides(TMDC)with different phase structures provide an ideal platform for valley modulation.The valley splitting has been achieved in hybrid phase WSe_(2),while its valley polarization remains unstudied.Magnetic field controllable valley polarization is explored in WSe_(2)with coexistence of H and T phases by an all-optical route.A record high valley polarization of 58.3%is acquired with a 19.9%T phase concentration under a 4-T magnetic field and nonresonant excitation.The enhanced valley polarization is dependent on the phase component and shows various increasing slopes,owing to the synergy between the T phase WSe_(2)and the magnetic field.The magnetic field controlled local magnetic momentums are revealed as the mechanism for the large valley polarization in H∕T-WSe_(2).This speculation is also verified by theoretical simulations of the nonequilibrium spin density.These results display a considerable valley magnetic response in phase-engineered TMDC and provide a large-scale scheme for valley polarization applications.展开更多
Heterostructures based on two-dimensional(2D) transition-metal dichalcogenides(TMDCs) possess unique electronic and optical properties, which open up unprecedented opportunities in nanoscale optoelectronic devices. Sy...Heterostructures based on two-dimensional(2D) transition-metal dichalcogenides(TMDCs) possess unique electronic and optical properties, which open up unprecedented opportunities in nanoscale optoelectronic devices. Synthesizing high-quality 2D TMDC heterostructures with different core/shell size ratios is of great significance for practical applications. Here, we report a simple one-step chemical vapor deposition(CVD) method for fabricating MoS2/WS2 lateral heterostructures with controllable core/shell size ratio. An ultrathin MoO3/WO3 film prepared by thermal evaporation was used as the precursor, and a step-like heating process was adopted to separately grow MoS2 and WS2 monolayers by taking advantage of the different melting points of MoO3 and WO3 sources. High-quality MoS2/WS2 lateral heterostructures with sharp interfaces were fabricated by optimizing the key growth parameters. Furthermore, the core/shell size ratio of heterostructures could be easily controlled by changing the thickness ratio of MoO3/WO3 film, and an approximately linear dependence between them is revealed. Compared with MoS2 or WS2 monolayers, the MoS2/WS2 heterostructure exhibited a shortened exciton lifetime owing to the type-Ⅱ energy band alignment, which is conducive to the application of high-performance devices. This work provides a facile strategy for the synthesis of 2D lateral heterostructures with controllable size ratio.展开更多
For comprehensive insights into the influences of sulfate on performance,microbial community and metabolic pathways in the acidification phase of a two-phase anaerobic system,a laboratory-scale acidogenic bioreactor w...For comprehensive insights into the influences of sulfate on performance,microbial community and metabolic pathways in the acidification phase of a two-phase anaerobic system,a laboratory-scale acidogenic bioreactor was continuously operated to treat wastewater with elevated sulfate concentrations from 2000 to 14000 mg/L.The results showed that the acidogenic bioreactor could achieve sulfate reduction efficiency of greater than 70%for influent sulfate content less than 12000 mg/L.Increased sulfate induced the accumulation of volatile fatty acids(VPAs),especially propionate and butyrate,which was the primary negative effects to system performance under the high-sulfate environment.High-throughput sequencing coupled with PICRUSt2 uncovered that the accumulation of VFAs was triggered by the decreasing of genes encoding short-chain acyl-CoA dehydrogenase(EC:1.3.8.1),regulating the transformation of propanoyl-CoA to propenoyl-CoA and butanoyl-CoA to crotonyl-CoA of propionate and butyrate oxidation pathways,which made these two process hardly proceed.Besides,genes encoding(EC:1.3.8.1)were mainly carried by order Clostridiales.Desulfovibrio was the most abundant sulfate-reducing bacteria and identified as the primary host of dissimilatory sulfate reduction ftinctional genes.Functional analysis indicated the dissimilatory sulfate reduction process predominated under a low sulfate environment,but was not favored under the circumstance of high-sulfate.With the increase of sulfate,the assimilatory sulfate reduction process finally overwhelmed dissimilatory as the dominant sulfate reduction pathway in acidogenic bioreactor.展开更多
Vertical van der Waals(vdW)heterostructures composed of two-dimensional(2D)layered materials have recently attracted substantial interests due to their unique properties.However,the direct synthesis of moirésuper...Vertical van der Waals(vdW)heterostructures composed of two-dimensional(2D)layered materials have recently attracted substantial interests due to their unique properties.However,the direct synthesis of moirésuperlattice remains a great challenge due to the difficulties in heterogeneous nucleation on smooth vdW surfaces.Here,we report a controllable chemical vapor deposition growth of complete monolayer WS_(2)on highly ordered pyrolytic graphite(HOPG)substrates through the plasma pretreatment.The results show that the morphologies of the grown WS_(2)have a strong dependence on the plasma parameters,including gas composition,source power,and treatment time.It is found that the surface C–C bonds are broken in the plasma pretreated HOPG,and the formed small clusters can act as the nucleation sites for the subsequent growth of WS_(2).Moreover,the height of clusters dominates the growth mode of WS_(2)islands.A transition from a 2D mode to three-dimensional(3D)growth mode occurs when the height is higher than the interlayer spacing of the heterostructure.Besides,diverse moirésuperlattices with different twist angles for WS_(2)/HOPG heterostructures are observed,and the formation mechanism is further analyzed by firstprinciples calculations.展开更多
Cetuximab is a widely used drug for treating head and neck squamous cell carcinomas(HNSCCs);however,it provides restricted clinical benefits,and its response duration is limited by drug resistance.Here,we conducted ra...Cetuximab is a widely used drug for treating head and neck squamous cell carcinomas(HNSCCs);however,it provides restricted clinical benefits,and its response duration is limited by drug resistance.Here,we conducted randomized“Phase II-like clinical trials”of 49 HNSCC PDX models and reveal multiple informative biomarkers for intrinsic resistance to cetuximab(e.g.,amplification of ANKH,up-regulation of PARP3).After validating these intrinsic resistance biomarkers in another HNSCC PDX cohort(61 PDX models),we generated acquired cetuximab resistance PDX models and analyzed them to uncover resistance mechanisms.Whole exome sequencing and transcriptome sequencing revealed diverse patterns of clonal selection in acquired resistant PDXs,including the emergence of subclones with strongly activated RAS/MAPK.Extending these insights,we show that a combination of a RAC1/RAC3 dual-target inhibitor and cetuximab could overcome acquired cetuximab resistance in vitro and in vivo.Beyond revealing intrinsic resistance biomarkers,our PDX-based study shows how clonal architecture changes underlying acquired resistance can be targeted to expand the therapeutic utility of this important drug to more HNSCC patients.展开更多
The quality of parts manufactured by laser powder bed fusion is closely related to the uniformity and density of the powder bed.In this work,the discrete element method is used to simulate the powder spreading process...The quality of parts manufactured by laser powder bed fusion is closely related to the uniformity and density of the powder bed.In this work,the discrete element method is used to simulate the powder spreading process by different spreader geometries with rough substrate surfaces.The results indicate that reducing the spreader inclination angle significantly increases the number of force chains,enhances compaction,and consequently improves the quality of the powder bed.Studies also show that optimizing the bottom structure of the spreader can effectively reduce exposed areas.An arc-shaped structure promotes particle packing and filling,improving the powder distribution characteristics.A narrow spreader significantly affects the packing density of the powder bed at low layer gaps,whereas a wide spreader is relatively less constrained.At high spreading speeds,the spreader with an inclination angle of 135°produces the highest quality of the powder bed.R1000 performs excellently at larger layer gaps.The above findings provide valuable guidance for optimizing powder spreading strategies in the laser powder bed fusion process.展开更多
文摘The revolution in information sharing is fundamentally supported by the highly efficient processing,storage,and transmission of data[1].For the latter,energy consumption continuously increases with the rapid development of information and communication technology[2].
基金funded by The National Natural Science Foundation of China(81872199)Key Program of National Natural Science Foundation of China(82030085)+4 种基金The National Key Research and Development Program of China(2017YFC0908500)The National Natural Science Foundation of China(82002853)China Postdoctoral Science Foundation(2019M661565)Innovative Research Team of High-level Local Universities in Shanghai(SHSMU-ZLCX20212300,SSMU-ZLCX20180500)funded by“Shuguang Program”supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(19SG13)。
文摘Cancer cell membrane(CCM)derived nanotechnology functionalizes nanoparticles(NPs)to recognize homologous cells,exhibiting translational potential in accurate tumor therapy.However,these nanoplatforms are majorly generated from fixed cell lines and are typically evaluated in cell line-derived subcutaneous-xenografts(CDX),ignoring the tumor heterogeneity and differentiation from inter-and intra-individuals and microenvironments between heterotopic-and orthotopic-tumors,limiting the therapeutic efficiency of such nanoplatforms.Herein,various biomimetic nanoplatforms(CCM-modified gold@Carbon,i.e.,Au@C-CCM)were fabricated by coating CCMs of head and neck squamous cell carcinoma(HNSCC)cell lines and patient-derived cells on the surface of Au@C NP.The generated Au@C-CCMs were evaluated on corresponding CDX,tongue orthotopic xenograft(TOX),immunecompetent primary and distant tumor models,and patient-derived xenograft(PDX)models.The Au@C-CCM generates a photothermal conversion efficiency up to 44.2% for primary HNSCC therapy and induced immunotherapy to inhibit metastasis via photothermal therapy-induced immunogenic cell death.The homologous CCM endowed the nanoplatforms with optimal targeting properties for the highest therapeutic efficiency,far above those with mismatched CCMs,resulting in distinct tumor ablation and tumor growth inhibition in all four models.This work reinforces the feasibility of biomimetic NPs combining modular designed CMs and functional cores for customized treatment of HNSCC,can be further extended to other malignant tumors therapy.
基金supported by the National Natural Science Foundation of China(No.21302081)the Scientific Fund of Sichuan Province,China(No.2014JQ0052)
文摘A highly efficient coupling reaction of N-heterocyclic carbene precursors with sulfonyl azides has been developed, affording a variety of pyrido[1,2-c][1,2,4]triazole-based π-conjugated triazenes. The present reaction proceeds under very mild conditions with good functional group tolerance. The resulting triazenes exhibit selective and sensitive fluorescent response toward Fe3+ion.
基金Project supported by the Plan of National Key Research and Development of China (2021YFB3503003)the National Natural Science Foundation of China (51871063)+1 种基金the Key Research and Development Plan of Shandong Province(2019JZZY020210)the Major Projects in Inner Mongolia。
文摘The electrochemical corrosion behavior of both (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets prepared with dual-main-phase method and N45-type magnets was studied in 3.5 wt% NaCl,1.1 wt% NaH_(2)PO_(4),and 2.5 wt% NaOH solutions,respectively.The (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets perform superior corrosion resistance than N45-type magnets in the tested solutions.In general,two kinds of magnets exhibit the best corrosion resistance property in 2.5 wt% NaOH solution,while the worst in 3.5 wt% NaCl solution.Microstructures of samples before and after corrosion were investigated.With the addition of Ce by means of dual-main-phase method,which is conducive to facilitating low-temperature sintering and grain refinement,uniform grain size and(Nd,Ce)-rich phase distribution form,give rise to narrow and thin corrosion channels.Moreover,the corrosion rate of the(Nd,Ce)-rich phase is lower than that of Nd-rich one.Acco rdingly,corro sion re sistance of (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnet is superior when compared with the commercial N45-type magnet which has comparable magnetic properties.
基金This study has been supported by Shaanxi Special Fund Project of Giant Panda International Cooperation(Panda Protection Letter[2019]No.93)the Project of Course Case Library Construction(Grant No.Z1050221011).
文摘The bacterium Avibacterium paragallinarum,previously known as Haemophilus paragallinarum,is responsible for caus-ing infectious coryza(IC)in chickens and other avian species.In this case report,an outbreak of Avibacterium paragal-linarum occurred in the Qinling area of China,resulting in clinical symptoms of facial swelling in several bird species,including Golden pheasant,Temminck's tragopan,and Peafowls,and three Golden pheasants died due to prolonged infection.Specific PCR results confrmed the presence of the pathogen in the infected birds.The report describes the clinical symptoms and pathological changes observed in the affected birds,as well as the isolation and identification of Avibacterium paragallinarum.Whole-genome sequencing and phylogenetic anal sis y were performed,and this is the frst report of inter-and intra-species transmission of infectious coryza among wild birds in China.
基金Acthe National Natural Science Foundation of China(Grant Nos.:91321102,11304257,61227009,11104229)the financial support from the Natural Science Foundation of Fujian Province(Grant Nos.:2011J05006,2009J05149,2014J01026)+2 种基金the financial support from Department of Education of Fujian Province(Grant No.:JA09146)Huang Hui Zhen Foundation of Jimei University(Grant No.:ZC2010014)the Scientific Research Foundation of Jimei University(Grant Nos.:ZQ2011008,ZQ2009004)
文摘A tiny number of Zn atoms were deposited on Si(111)-(797) surface to study the evolution process of Zninduced nanoclusters. After the deposition, three types(type I, II, and III) of Zn-induced nanoclusters were observed to occupy preferably in the faulted half-unit cells. These Zn-induced nanoclusters are found to be related to one, two, and three displaced Si edge adatoms, and simultaneously cause the depression of one, two, and three closest Si edge adatoms in the neighboring unfaulted half-unit cells at negative voltages, respectively. First-principles adsorption energy calculations show that the observed type I, II, and III nanoclusters can reasonably be assigned as the Zn3Si1, Zn5Si2, and Zn7Si3 clusters,respectively. And Zn3Si1, Zn5Si2, and Zn7Si3 clusters are, respectively, the most stable structures in cases of one, two, and three displaced Si edge adatoms. Based on the above energy-preferred models, the simulated bias-dependent STM images are all well consistent with the experimental observations. Therefore, the most stable Zn7Si3 nanoclusters adsorbed on the Si(111)-(797) surface should grow up on the base of Zn3Si1 and Zn5Si2clusters. A novel evolution process from Zn3Si1 to Zn5Si2, and finally to Zn7Si3 nanocluster is unveiled.
基金Supported by the Research Project of Jianghan University(Grant No.2021yb056)the National Natural Science Foundation of China(Grant Nos.1197115812061039).
文摘Given a simple graph G,the oriented graph G^(σ)is obtained from G by orienting each edge and G is called the underlying graph of G^(σ).The skew-symmetric adjacency matrix S(G^(σ))of G^(σ),where the(u,v)-entry is 1 if there is an arc from u to v,and−1 if there is an arc from v to u(and 0 otherwise),has eigenvalues of 0 or pure imaginary.The k-th-skew spectral moment of Gσis the sum of power k of all eigenvalues of S(G^(σ)),where k is a non-negative integer.The skew spectral moments can be used to produce graph catalogues.In this paper,we researched the skew spectral moments of some oriented trees and oriented unicyclic graphs and produced their catalogues in lexicographical order.We determined the last 2[d/4]oriented trees with underlying graph of diameter d and the last 2[g/4]+1 oriented unicyclic graphs with underlying graph of girth g,respectively.
基金Supported by the Natural Science Foundation Project of Guangxi University of Chinese Medicine(2020MS058)Youth Fund Project of Guangxi Natural Science Foundation(2022JJB140402)+4 种基金Basic Research Ability Improvement Project of Young and Middle-aged Teachers in Guangxi Universities(2022KY0278)"Youth Project"Talent Cultivation Project of Guangxi International Zhuang Medicine Hospital(2022001)High-level Key Discipline of Traditional Chinese Medicine(Zhuang Pharmacy)Construction Project of National Administration of Traditional Chinese Medicine(GZYYRJH[2022]226)Multidisciplinary Cross Innovation Team Project of Guangxi Traditional Chinese Medicine(GZKJ2309)"High-level Talent Cultivation and Innovation Team"Project of Guangxi University of Chinese Medicine(2022A008).
文摘[Objectives]To explore the effect of psoralen combined with paclitaxel on the apoptosis of MCF-7 cells.[Methods]The effects of different concentrations of psoralen,paclitaxel,or the combination of psoralen and paclitaxel on cell viability were detected using CCK-8 assay kit.Cell cycle distribution and apoptosis after 24 h of psoralen(0.16,0.32,0.64 mmol/L),paclitaxel(0.1μmol/L),combined action of psoralen(0.32 mmol/L)and paclitaxel(0.1μmol/L)were detected using flow cytometry.[Results]Lower concentration of psoralen(0.04-0.32 mmol/L)showed no significant inhibitory effect on cells.After combined with paclitaxel,the inhibitory effect on MCF-7 cell proliferation was significantly higher than that of the group treated alone.Compared with the paclitaxel group,the cell apoptosis rate in the drug combination group was significantly increased.Different low concentrations of psoralen can block the cell cycle of MCF-7 at G 0/G 1 phase,while paclitaxel can block the cell cycle at G 2/M phase.After combined action,the number of cells blocked at G 2/M phase decreased.[Conclusions]Overall,the combined effect of psoralen and paclitaxel can enhance anti-tumor ability by inhibiting cell proliferation,inducing apoptosis,and blocking cell cycle.
基金supported by the National Science Fund for Excellent Young Scholars(Grant No.62022068)the National Natural Science Foundation of China(Grant Nos.61874092,61974123,61804129,and 62274139)the Science and Technology Project of Fujian Province of China(Grant Nos.2018I0017 and 2019H0002).
文摘Achieving valley pseudospin with large polarization is crucial in the implementation of quantum information applications.Transition metal dichalcogenides(TMDC)with different phase structures provide an ideal platform for valley modulation.The valley splitting has been achieved in hybrid phase WSe_(2),while its valley polarization remains unstudied.Magnetic field controllable valley polarization is explored in WSe_(2)with coexistence of H and T phases by an all-optical route.A record high valley polarization of 58.3%is acquired with a 19.9%T phase concentration under a 4-T magnetic field and nonresonant excitation.The enhanced valley polarization is dependent on the phase component and shows various increasing slopes,owing to the synergy between the T phase WSe_(2)and the magnetic field.The magnetic field controlled local magnetic momentums are revealed as the mechanism for the large valley polarization in H∕T-WSe_(2).This speculation is also verified by theoretical simulations of the nonequilibrium spin density.These results display a considerable valley magnetic response in phase-engineered TMDC and provide a large-scale scheme for valley polarization applications.
基金supported by the National Natural Science Foundation of China (Grant Nos. 61974123, 61774128, 61874092, 11604275, 6170404061804129)+4 种基金National Science Fund for Excellent Young Scholars (Grant No. 62022068)Natural Science Foundation of Fujian Province of China(Grant Nos. 2018I0017, and 2019H0002)Natural Science Foundation of Jiangxi Province of China (Grant No. 20192BAB217013)Science and Technology Key Projects of Xiamen (Grant No. 3502ZCQ20191001)Fundamental Research Funds for the Central Universities (Grant Nos.20720190055, and 20720190058)。
文摘Heterostructures based on two-dimensional(2D) transition-metal dichalcogenides(TMDCs) possess unique electronic and optical properties, which open up unprecedented opportunities in nanoscale optoelectronic devices. Synthesizing high-quality 2D TMDC heterostructures with different core/shell size ratios is of great significance for practical applications. Here, we report a simple one-step chemical vapor deposition(CVD) method for fabricating MoS2/WS2 lateral heterostructures with controllable core/shell size ratio. An ultrathin MoO3/WO3 film prepared by thermal evaporation was used as the precursor, and a step-like heating process was adopted to separately grow MoS2 and WS2 monolayers by taking advantage of the different melting points of MoO3 and WO3 sources. High-quality MoS2/WS2 lateral heterostructures with sharp interfaces were fabricated by optimizing the key growth parameters. Furthermore, the core/shell size ratio of heterostructures could be easily controlled by changing the thickness ratio of MoO3/WO3 film, and an approximately linear dependence between them is revealed. Compared with MoS2 or WS2 monolayers, the MoS2/WS2 heterostructure exhibited a shortened exciton lifetime owing to the type-Ⅱ energy band alignment, which is conducive to the application of high-performance devices. This work provides a facile strategy for the synthesis of 2D lateral heterostructures with controllable size ratio.
基金We gratefully acknowledge generous support provided by the National Natural Science Foundation of China(No.51978328).
文摘For comprehensive insights into the influences of sulfate on performance,microbial community and metabolic pathways in the acidification phase of a two-phase anaerobic system,a laboratory-scale acidogenic bioreactor was continuously operated to treat wastewater with elevated sulfate concentrations from 2000 to 14000 mg/L.The results showed that the acidogenic bioreactor could achieve sulfate reduction efficiency of greater than 70%for influent sulfate content less than 12000 mg/L.Increased sulfate induced the accumulation of volatile fatty acids(VPAs),especially propionate and butyrate,which was the primary negative effects to system performance under the high-sulfate environment.High-throughput sequencing coupled with PICRUSt2 uncovered that the accumulation of VFAs was triggered by the decreasing of genes encoding short-chain acyl-CoA dehydrogenase(EC:1.3.8.1),regulating the transformation of propanoyl-CoA to propenoyl-CoA and butanoyl-CoA to crotonyl-CoA of propionate and butyrate oxidation pathways,which made these two process hardly proceed.Besides,genes encoding(EC:1.3.8.1)were mainly carried by order Clostridiales.Desulfovibrio was the most abundant sulfate-reducing bacteria and identified as the primary host of dissimilatory sulfate reduction ftinctional genes.Functional analysis indicated the dissimilatory sulfate reduction process predominated under a low sulfate environment,but was not favored under the circumstance of high-sulfate.With the increase of sulfate,the assimilatory sulfate reduction process finally overwhelmed dissimilatory as the dominant sulfate reduction pathway in acidogenic bioreactor.
基金the National Natural Science Foundations of China(Nos.61974123,61874092,and 61804129)the National Science Fund for Excellent Young Scholars(No.62022068)the Fundamental Research Funds for the Central Universities(Nos.20720190055 and 20720190058).
文摘Vertical van der Waals(vdW)heterostructures composed of two-dimensional(2D)layered materials have recently attracted substantial interests due to their unique properties.However,the direct synthesis of moirésuperlattice remains a great challenge due to the difficulties in heterogeneous nucleation on smooth vdW surfaces.Here,we report a controllable chemical vapor deposition growth of complete monolayer WS_(2)on highly ordered pyrolytic graphite(HOPG)substrates through the plasma pretreatment.The results show that the morphologies of the grown WS_(2)have a strong dependence on the plasma parameters,including gas composition,source power,and treatment time.It is found that the surface C–C bonds are broken in the plasma pretreated HOPG,and the formed small clusters can act as the nucleation sites for the subsequent growth of WS_(2).Moreover,the height of clusters dominates the growth mode of WS_(2)islands.A transition from a 2D mode to three-dimensional(3D)growth mode occurs when the height is higher than the interlayer spacing of the heterostructure.Besides,diverse moirésuperlattices with different twist angles for WS_(2)/HOPG heterostructures are observed,and the formation mechanism is further analyzed by firstprinciples calculations.
基金The National Key Research and Development Program of China(2017YFC0908500)The National Natural Science Foundation of China(81872199)+1 种基金grants from Key Program of National Natural Science Foundation of China(82030085)Innovative Research Team of High-level Local Universities in Shanghai(SHSMU-ZLCX20212300,SSMUZLCX20180500).
文摘Cetuximab is a widely used drug for treating head and neck squamous cell carcinomas(HNSCCs);however,it provides restricted clinical benefits,and its response duration is limited by drug resistance.Here,we conducted randomized“Phase II-like clinical trials”of 49 HNSCC PDX models and reveal multiple informative biomarkers for intrinsic resistance to cetuximab(e.g.,amplification of ANKH,up-regulation of PARP3).After validating these intrinsic resistance biomarkers in another HNSCC PDX cohort(61 PDX models),we generated acquired cetuximab resistance PDX models and analyzed them to uncover resistance mechanisms.Whole exome sequencing and transcriptome sequencing revealed diverse patterns of clonal selection in acquired resistant PDXs,including the emergence of subclones with strongly activated RAS/MAPK.Extending these insights,we show that a combination of a RAC1/RAC3 dual-target inhibitor and cetuximab could overcome acquired cetuximab resistance in vitro and in vivo.Beyond revealing intrinsic resistance biomarkers,our PDX-based study shows how clonal architecture changes underlying acquired resistance can be targeted to expand the therapeutic utility of this important drug to more HNSCC patients.
基金supported by the National Natural Science Fund for Excellent Young Scholars(62022068)the National Key Research and Development Program of China(2018YFB0406603)+3 种基金the National Natural Science Foundation of China(61804129,61974123 and 61874092)the Science and Technology Key Project of Xiamen(3502ZCQ20191001)the Science and Technology Project of Fujian Province,China(2019H0002)the Natural Science Foundation of Jiangxi Province,China(20192BAB217013)。
文摘The quality of parts manufactured by laser powder bed fusion is closely related to the uniformity and density of the powder bed.In this work,the discrete element method is used to simulate the powder spreading process by different spreader geometries with rough substrate surfaces.The results indicate that reducing the spreader inclination angle significantly increases the number of force chains,enhances compaction,and consequently improves the quality of the powder bed.Studies also show that optimizing the bottom structure of the spreader can effectively reduce exposed areas.An arc-shaped structure promotes particle packing and filling,improving the powder distribution characteristics.A narrow spreader significantly affects the packing density of the powder bed at low layer gaps,whereas a wide spreader is relatively less constrained.At high spreading speeds,the spreader with an inclination angle of 135°produces the highest quality of the powder bed.R1000 performs excellently at larger layer gaps.The above findings provide valuable guidance for optimizing powder spreading strategies in the laser powder bed fusion process.
