Layered manganese dioxide(δ-MnO_(2))is considered a promising ammonium ion capture electrode material for capacitive deionization(CDI)attributed to its high theoretical capacity and cost-effectiveness.Nevertheless,it...Layered manganese dioxide(δ-MnO_(2))is considered a promising ammonium ion capture electrode material for capacitive deionization(CDI)attributed to its high theoretical capacity and cost-effectiveness.Nevertheless,it continues to encounter challenges including rapid capacity degradation,structural instability,and Jahn-Teller effect.Herein,a crystal and electron synergistically regulation engineering strategy is proposed for the suppression of the Jahn-Teller effect and the improvement of ammonium ion storage dynamics in F doped MnO_(2)(MnOF).The induced action of F ions transforms the MnO_(2)structure from the original cubic[MnO_(6)]octahedron into an asymmetric[Mn(OF)_(6)]octahedron with electron redistribution,and generates a localized charge imbalance along the O-Mn-F pathway,which promotes electron transfer from Mn to F direction,accelerates electron transfer,and reduces the energy barrier of ammonium ion diffusion.As a result,the prepared MnOF exhibited a maximum salt adsorption capacity of 144.3 mg g^(−1)and an exceptionally high salt adsorption rate of 18.25 mg g^(−1)min^(-1),along with outstanding cycling stability.Besides,ex/in situ characterizations reveal that in MnOF,the formation/breaking of hydrogen bond is accompanied by the insertion/deinsertion of NH_(4)^(+).Therefore,the rational introduction of highly electronegative anions provides a new direction for the development of advanced CDI electrode materials.展开更多
Spinal cord injury is a severe neurological condition characterized by the permanent loss of nerve cell function and a failure in neural circuit reconstruction-key factors contributing to disability.Therefore,explorin...Spinal cord injury is a severe neurological condition characterized by the permanent loss of nerve cell function and a failure in neural circuit reconstruction-key factors contributing to disability.Therefore,exploring effective strategies to promote the repair and regeneration of nerve cells after spinal cord injury is crucial for optimizing patient prognosis.The purpose of this paper is to conduct an in-depth review of the pathological changes in nerve cells after spinal cord injury and to present the state of research on the role of exercise training in promoting the repair and regeneration of nerve cells after spinal cord injury.In terms of the intrinsic growth capacity of neurons,disruptions in the dynamic balance between growth cones and the cytoskeleton,the dysregulation of transcription factors,abnormal protein signaling transduction,and altered epigenetic modifications collectively hinder axonal regeneration.Additionally,the microenvironment of neurons undergoes a series of complex changes,initially manifesting as edema,which may be exacerbated by spinal cord ischemia-reperfusion injury,further increasing the extent of nerve cell damage.The abnormal proliferation of astrocytes leads to the formation of glial scars,creating a physical barrier to nerve regeneration.The inflammatory response triggered by the excessive activation of microglia negatively impacts the process of nerve repair.Non-invasive interventions involving exercise training have shown significant potential in promoting nerve repair as part of a comprehensive treatment strategy for spinal cord injury.Specifically,exercise training can reshape the growth cone and cytoskeletal structures of neurons,regulate transcription factor activity,modulate protein signaling pathways,and influence epigenetic modifications,thereby activating the intrinsic repair mechanisms of neurons.Moreover,exercise training can regulate the activation state of astrocytes,optimize the inflammatory response and metabolic processes,promote astrocyte polarization,enhance angiogenesis,reduce glial scar formation,and modulate the expression levels of nerve growth factors.It also effectively helps regulate microglial activation,promotes axonal regeneration,and improves phagocytic function,thereby optimizing the microenvironment for nerve repair.In terms of clinical translation,we summarize the preliminary results of new drug research and development efforts,the development of innovative devices,and the use of exercise training in promoting clinical advancements in nerve repair following spinal cord injury,while considering their limitations and future application prospects.In summary,this review systematically analyzes findings relating to the pathological changes occurring in nerve cells after spinal cord injury and emphasizes the critical role of exercise training in facilitating the repair and regeneration of nerve cells.This work is expected to provide new ideas and methods for the rehabilitation of patients with spinal cord injury.展开更多
Many labdane-related diterpenoids(LRDs) exhibit high values in drug development.Their diversity in structure and bioactivity,to a large extent,arise from oxidative modifications which are mainly catalyzed by cytochrom...Many labdane-related diterpenoids(LRDs) exhibit high values in drug development.Their diversity in structure and bioactivity,to a large extent,arise from oxidative modifications which are mainly catalyzed by cytochrome P450s(CYPs).The medicinal plant Euphorbia fischeriana Steud.is rich in LRDs with distinct scaffolds.Herein,we characterized three cytochrome P450s involved in LRD biosynthesis from this plant.Notably,CYP71D450 and CYP701A148 are two substrate-promiscuity CYPs.The former is the first example of CYPs which can oxidize C-3 of ent-atisane skeleton and ent-isopimara-7(8),15-diene,and the latter is the first example of CYPs which can oxidize C-19 of ent-abietane and ent-pimarane skeletons.This study expands the toolkit for bioproduction of diverse LRDs.展开更多
Phosphatase and tensin homolog deleted on chromosome 10(PTEN)messenger RNA(mRNA)delivery has fueled a great hope for tumor immunotherapy via augmenting the immune sensitivity in many human cancers.However,therapeutic ...Phosphatase and tensin homolog deleted on chromosome 10(PTEN)messenger RNA(mRNA)delivery has fueled a great hope for tumor immunotherapy via augmenting the immune sensitivity in many human cancers.However,therapeutic efficacy and clinical translation are limited by inadequate mRNA expression,insufficient immune stimulation and stringent storage requirements.Herein,inspired by the intrinsic properties of metal ions and exosomes,we developed a biomimetic delivery system(Mn-NP@PM)with superior stability for precise colorectal cancer immunotherapy.This platform employs adjuvant-metal-ion chelation for PTEN mRNA loading and PD-L1 antibodies(αPD-L1)-modified monocyte-macrophage membrane coating for mRNA protection and tumor targeting.Mn^(2+) was specifically selected due to its capacity for reversible mRNA binding through weak non-electrostatic interactions,facilitating efficient release,while simultaneously activating the stimulator of interferon genes(STING)pathway.Importantly,Mn-NP@PM exhibited membrane fusion for immediate cytosolic mRNA delivery,bypassing endo-lysosomal escape,optimizing transportation efficiency.Clinical-data-driven analyses further demonstrated that Mn-NP@PM-mediated PTEN restoration significantly increased T-cell infiltration and strengthened antitumor immunity in humanized patient derived xenograft(PDX)models.Collectively,this biomimetic,metal-ion-chelating,membrane-coated mRNA delivery system represents a versatile and clinically translatable strategy for personalized cancer immunotherapy.展开更多
The spatially-resolved laser-based high resolution angle resolved photoemission spectroscopy(ARPES)measurements have been performed on the optimally-doped HgBa_(2)Ca_(2)Cu_(3)O_(8+δ)(Hg1223)superconductor with a T_(c...The spatially-resolved laser-based high resolution angle resolved photoemission spectroscopy(ARPES)measurements have been performed on the optimally-doped HgBa_(2)Ca_(2)Cu_(3)O_(8+δ)(Hg1223)superconductor with a T_(c) of 133 K.Two distinct regions are identified on the cleaved surface:the single Fermi surface region where only one Fermi surface is observed,and the double Fermi surface region where two Fermi surface sheets are resolved coming from both the inner(IP)and outer(OP)CuO_(2) planes.The electronic structure and superconducting gap are measured on both of these two regions.In both cases,the observed electronic states are mainly concentrated near the nodal region.The momentum dependence of the superconducting gap deviates from the standard d-wave form.These results indicate that the surface electronic structure of Hg1223 behaves more like that of underdoped cuprates.展开更多
Bone is an endocrine organ involved in modulating glucose homeostasis. The role of the bone formation marker osteocalcin （OCN） in predicting diabetes was reported, but with conflicting results. No study has explored...Bone is an endocrine organ involved in modulating glucose homeostasis. The role of the bone formation marker osteocalcin （OCN） in predicting diabetes was reported, but with conflicting results. No study has explored the association between baseline bone resorption activity and incident diabetes or prediabetes during follow-up. Our objective was to examine the relationship between the baseline bone resorption marker crosslinked C-telopeptide of type I collagen （CTX） and glycemic dysregulation after 4 years. This longitudinal study was conducted in a university teaching hospital. A total of 195 normal glucose tolerant （NGT） women at baseline were invited for follow-up. The incidence of diabetes and prediabetes （collectively defined as dysglycemia） was recorded. A total of 128 individuals completed the 4-year study. The overall conversion rate from NGT to dysglycemia was 31.3%. The incidence of dysglycemia was lowest in the middle tertile [16.3% （95% confidence interval （CI）, 6.8%-30.70/0）] compared with the lower [31.0% （95% CI, 17.2%-46.1%）] and upper [46.5% （95% CI, 31.2%-62.6%）] tertiles of CTX, with a significant difference seen between the middle and upper tertiles （P = 0.002 5）. After adjusting for multiple confounding variables, the upper tertile of baseline CTX was associated with an increased risk of incident dysglycemia, with an odds ratio of 7.09 （95% CI, 1.73-28.99） when the middle tertile was the reference. Osteoclasts actively regulate glucose homeostasis in a biphasic model that moderately enhanced bone resorption marker CTX at baseline provides protective effects against the deterioration of glucose metabolism, whereas an overactive osteoclastic function contributes to an increased risk of subsequent dysglycemia.展开更多
The combined fouling during ultrafiltration（UF） of surface water pretreated to different extents was investigated to disclose the roles of polysaccharides, proteins, and inorganic particles in UF membrane fouling. B...The combined fouling during ultrafiltration（UF） of surface water pretreated to different extents was investigated to disclose the roles of polysaccharides, proteins, and inorganic particles in UF membrane fouling. Both reversible and irreversible fouling decreased with enhanced pretreatment（biologically active carbon（BAC） treatment and sand filtration）. The sand filter effluent fouled the membrane very slowly. The UF membrane removed turbidity to less than 0.1 nephelometric turbidity unit（NTU）, reduced polysaccharides by 25.4%–29.9%, but rejected few proteins. Both polysaccharides and inorganic particles were detected on the fouled membranes, but inorganic particles could be effectively removed by backwashing. The increase of turbidity in the sand filter effluent to 3.05 NTU did not significantly increase the fouling rate, but an increase in the turbidity in the BAC effluent to6.11 NTU increased the fouling rate by more than 100%. The results demonstrated that the polysaccharide, not the protein, constituents of biopolymers were responsible for membrane fouling. Membrane fouling was closely associated with a small fraction of polysaccharides in the feed water. Inorganic particles exacerbated membrane fouling only when the concentration of fouling–inducing polysaccharides in the feed water was relatively high. The combined fouling was largely reversible, and polysaccharides were the predominant substances responsible for irreversible fouling.展开更多
In a recent paper(Luo H et al.,2022),we found that the peak amplitudes of diurnal magnetic variations,measured during martian days(sols)at the InSight landing site,exhibited quasi Carrington-Rotation(qCR)periods at hi...In a recent paper(Luo H et al.,2022),we found that the peak amplitudes of diurnal magnetic variations,measured during martian days(sols)at the InSight landing site,exhibited quasi Carrington-Rotation(qCR)periods at higher eigenmodes of the natural orthogonal components(NOC);these results were based on~664 sols of magnetic field measurements.However,the source of these periodic variations is still unknown.In this paper we introduce the neutral-wind driven ionospheric dynamo current model(e.g.,Lillis et al.,2019)to investigate the source.Four candidates-the draped IMF,electron density/plasma density,the neutral densities,and the electron temperature in the ionosphere with artificial qCR periodicity,are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods.Results show that the electron density/plasma density,which controls the total conductivity in the dynamo region,appears to account for the greatest part of the surface qCR variations;its contribution reaches about 67.6%.The draped IMF,the neutral densities,and the electron temperature account,respectively,for only about 12.9%,10.3%,and 9.2%of the variations.Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations.We suggest also that the timevarying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km.展开更多
Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not bee...Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not been very effective in high-temperature drilling operations. Thermo-responsive Janus nanocomposites are expected to strongly interact with clay particles from the inward hemisphere of nanomaterials, which drive the establishment of a tighter hydrophobic membrane over the shale surface at the outward hemisphere under geothermal conditions for shale stabilization. This work combines the synergistic benefits of thermo-responsive and zwitterionic nanomaterials to synchronously enhance the chemical inhibitions and plugging performances in shale under harsh conditions. A novel thermoresponsive Janus nanosilica(TRJS) exhibiting zwitterionic character was synthesized, characterized,and assessed as shale stabilizer for WBDFs at high temperatures. Compared to pristine nanosilica(Si NP)and symmetrical thermo-responsive nanosilica(TRS), TRJS exhibited anti-polyelectrolyte behaviour, in which electrolyte ions screened the electrostatic attraction between the charged particles, potentially stabilizing nanomaterial in hostile shaly environments(i.e., up to saturated brine or API brine). Macroscopically, TRJS exhibited higher chemical inhibition than Si NP and TRS in brine, prompting a better capability to control pressure penetration. TRJS adsorbed onto the clay surface via chemisorption and hydrogen bonding, and the interactions became substantial in brine, according to the results of electrophoretic mobility, surface wettability, and X-ray diffraction. Thus, contributing to the firm trapping of TRJS into the nanopore structure of the shale, triggering the formation of a tight hydrophobic membrane over the shale surface from the outward hemisphere. The addition of TRJS into WBDF had no deleterious effect on fluid properties after hot-treatment at 190℃, implying that TRJS could find potential use as a shale stabilizer in WBDFs in hostile environments.展开更多
Wire arc additive manufacturing(WAAM)technique is a promising approach to producing large-scale metal components due to high deposition efficiency and low production cost.However,fundamental research about WAAM-proces...Wire arc additive manufacturing(WAAM)technique is a promising approach to producing large-scale metal components due to high deposition efficiency and low production cost.However,fundamental research about WAAM-processed Al-Mg-Sc-Zr alloy was still fewer.In this study,Al-6.54Mg-0.36Sc-0.11Zr(wt%)components were successfully manufactured by WAAM with an interlayer temperature at 100℃(named IW)and continuous printing(named CP),and the corresponding porosity,microstructure,and mechanical properties of components were studied in detail.The porosity of components as-deposited was relatively low,about 0.385%and 0.116%,respectively.The microstructures of the two components exhibited the same distribution characteristics in XZ and YZ planes:fine equiaxed grains(FEG)at remelted zone+FEG and coarse equiaxed grain(CEG)alternative distribution at middle zone+FEG at the top zone of the molten pool.The average grain size of component IW was about 10.51±6.01μm,and that of component CP significantly increased,to about 11.85±5.86μm.The short-circuit transition mode of cold metal transfer technology and the heterogeneous nucleation effect of primary Al3(Sc,Zr)and Al3(Sc,Zr,Ti)phases together promoted the formation of equiaxed grains and refined the microstructures.After heat treatment at 325℃and 6 h,nano-Al3Sc precipitated with a size of about 15-50 nm.The yield strength(YS)of components IW and CP increased from 171±3 to 261±1 MPa and 168±7 to 240±17 MPa,respectively.Component IW had the highest ultimate tensile strength,about 400±1 MPa.For WAAMprocessed Al-Mg-Sc-Zr alloys,the contribution of the strengthening mechanism to YS was solid solution strengthening>precipitation strengthening>fine grain strengthening>dislocation strengthening.展开更多
Hepatobiliary tumor (HBT), one of the leading causes of cancer deaths globally, is more frequent in East Asia including China [1].HBTincludeslivercancer,cholangiocarcinomaandgallbladder cancer.HBTburdenvariesmarkedlyb...Hepatobiliary tumor (HBT), one of the leading causes of cancer deaths globally, is more frequent in East Asia including China [1].HBTincludeslivercancer,cholangiocarcinomaandgallbladder cancer.HBTburdenvariesmarkedlybygenderandgeographic regionduetotheexposureofriskfactors.MajorityofthehepatocellularcarcinomasareassociatedwithhepatitisB-typevirus展开更多
Super-high resolution laser-based angle-resolved photoemission measurements are carried out on LiFeAs superconductor to investigate its electron dynamics. Three energy scales at ~ 20 meV, ~ 34 meV, and ~ 55 meV are re...Super-high resolution laser-based angle-resolved photoemission measurements are carried out on LiFeAs superconductor to investigate its electron dynamics. Three energy scales at ~ 20 meV, ~ 34 meV, and ~ 55 meV are revealed for the first time in the electron self-energy both in the superconducting state and normal state. The ~ 20 meV and ~ 34 meV scales can be attributed to the coupling of electrons with sharp bosonic modes which are most likely phonons. These observations provide definitive evidence on the existence of mode coupling in iron-based superconductors.展开更多
High and stable yield is the main goal of soybean genetic improvement.In this study,association analysis was used to detect the quantitative trait loci(QTL)for the plant height,and soybean growth period using 182 SSR ...High and stable yield is the main goal of soybean genetic improvement.In this study,association analysis was used to detect the quantitative trait loci(QTL)for the plant height,and soybean growth period using 182 SSR markers in the RIL population of 136 F_(4:8) lines,which developed from a cross between photoperiod-insensitive cultivar‘Dongnong 47’and photoperiod-sensitive variety PI317334–B.The results showed that 33 QTLs related to soybean growth period and plant height traits were detected by compound interval mapping,and were located on 12 linkage groups including N,C1,C2,J,D1a,B2,E,G,A2,O,L,I,with the contribution rate of 7.85–33.84%.These QTL loci and linkage markers related to soybean photoperiod sensitivity,would be helpful to identify key genes that control soybean photoperiod sensitivity,and provide an important basis for the breeding of new photoperiod-insensitive soybean varieties based on molecular design breeding.展开更多
Objective:To explore the anti-tumor of breast cancer metastasis suppressor 1(BRMS1)on renal cell carcinoma.Methods:BRSM1 stabilized overexpressed and knockdown cell models were constructed to detect the effect of BRMS...Objective:To explore the anti-tumor of breast cancer metastasis suppressor 1(BRMS1)on renal cell carcinoma.Methods:BRSM1 stabilized overexpressed and knockdown cell models were constructed to detect the effect of BRMS1 overexpression and knockdown on viability rate of 769-P cells.Activation of PI3K/AKT-mTOR-NFκB signaling pathway,expression of cellular apoptosis-related proteins,DNA damage repair-related proteins and angiogenesis-related proteins were detected using Western blotting analysis.Results:The viability rate of 769-P cells were significantly decreased in BRMS1 overexpression cells while significantly increased in BRMS1 knockdown cells(P<0.05).The activity of PI3K/AKT-mTOR-NFκB signaling pathway was significantly inhibited with BRMS1 overexpression(P<0.05),and expression of BAX was significantly increased with significantly decreased expression of Bcl-2(P<0.05).Besides,BRMS1 overexpression could significantly decrease the expression of DNA damage repair-related proteins and angiogenesis and cell-matrix degradation related proteins(P<0.05).Conclusion:BRMS1 induces apoptosis of renal cell carcinoma and performs an anti-tumor effect via inhibition of PI3K/AKT-mTOR-NFκB signaling pathway,expression of DNA damage repair-related proteins and angiogenesis-related proteins.展开更多
Wire arc additive manufacturing(WAAM)is one of the most promising approaches to manufacturing large and complex metal components owing to its low cost and high efficiency.However,pores and coarse columnar grains cause...Wire arc additive manufacturing(WAAM)is one of the most promising approaches to manufacturing large and complex metal components owing to its low cost and high efficiency.However,pores and coarse columnar grains caused by thermal accumulation in WAAM significantly decrease the strength and increase the anisotropy,preventing the achievement of both high strength and isotropy.In this study,the strength and anisotropy of AlMg-Sc-Zr alloys were improved by regulating heat input.The results indicated that as the heat input increased from 60 to 99 J/mm,all the components had lower porosity(lower than 0.04%),the size of the Al_(3)(Sc_(1-x),Zr_(x))phases decreased,and the number density increased.The average grain size gradually decreased,and the grain morphologies transformed from coarse equiaxed grain(CEG)+fine equiaxed grain(FEG)to FEG owing to the increase in Al_(3)(Sc_(1-x),Zr_(x))phases with increasing heat input.After heat treatment at 325℃for 6 h,high-density dispersed Al_(3)Sc phases(<10 nm)precipitated.The alloy possessed the highest strength at 79 J/mm,ultimate tensile strength(UTS)of approximately 423±3 MPa,and in-plane anisotropy of approximately 4.3%.At a heat input of 99 J/mm,the in-plane anisotropy decreased to 1.2%and UTS reached 414±5 MPa.The reduction in the CEG prolonged the crack propagation path,which improved the UTS in the vertical direction and reduced the anisotropy.Theoretical calculations indicated that the main strengthening mechanisms were solid solution and precipitation strengthening.This study lays the theoretical foundations for WAAM-processed high-strength and isotropic Al alloy components.展开更多
High-precision magnetic field measurements are crucial for understanding Earth’s internal structure,space environment,and dynamic geomagnetic variations.Data from the Fluxgate Magnetometer (FGM) on the Macao Science ...High-precision magnetic field measurements are crucial for understanding Earth’s internal structure,space environment,and dynamic geomagnetic variations.Data from the Fluxgate Magnetometer (FGM) on the Macao Science Satellite-1A (MSS-1A),added to data from other space-based magnetometers,should increase significantly the ability of scientists to observe changes in Earth’s magnetic field over time and space.Additionally,the MSS-1A’s FGM is intended to help identify magnetic disturbances affecting the spacecraft itself.This report focuses on the in-flight calibration of the MSS-1 FGM.A scalar calibration,independent of geomagnetic field models,was performed to correct offsets,sensitivities,and misalignment angles of the FGM.Using seven months of data,we find that the in-flight calibration parameters show good stability.We determined Euler angles describing the rotational relationship between the FGM and the Advanced Stellar Compass (ASC) coordinate system using two approaches:calibration with the CHAOS-7 geomagnetic field model,and simultaneous estimation of Euler angles and Gaussian spherical harmonic coefficients through self-consistent modeling.The accuracy of Euler angles describing the rotation was better than 18 arcsec.The calibrated FGM data exhibit good agreement with the calibrated data of the Vector Field Magnetometer (VFM),which is the primary vector magnetometer of the satellite.These calibration efforts have significantly improved the accuracy of the FGM measurements,which are now providing reliable data for geomagnetic field studies that promise to advance our understanding of the Earth’s magnetic environment.展开更多
We consider the multiplicity of solutions to a p(x)-Laplacian problem involving supercritical Sobolev growth via Ricceri’s principle.By means of truncation combined with De Giorgi iteration,we can extend the results ...We consider the multiplicity of solutions to a p(x)-Laplacian problem involving supercritical Sobolev growth via Ricceri’s principle.By means of truncation combined with De Giorgi iteration,we can extend the results of subcritical and critical growth to supercritical growth and obtain at least three solutions to the p(x)-Laplacian problem.展开更多
基金financial support from the National Natural Science Foundation of China(22108032 and 22178055)the Dongguan Introduction Program of Leading Innovative and Entrepreneurial Talents+1 种基金the support of characterization from the Dongguan University of Technology Analytical and Testing Centerthe Guangdong Provincial Key Laboratory of Intelligent Disaster Prevention and Emergency Technologies for Urban Lifeline Engineering(2022)(Grant No.2022B1212010016).
文摘Layered manganese dioxide(δ-MnO_(2))is considered a promising ammonium ion capture electrode material for capacitive deionization(CDI)attributed to its high theoretical capacity and cost-effectiveness.Nevertheless,it continues to encounter challenges including rapid capacity degradation,structural instability,and Jahn-Teller effect.Herein,a crystal and electron synergistically regulation engineering strategy is proposed for the suppression of the Jahn-Teller effect and the improvement of ammonium ion storage dynamics in F doped MnO_(2)(MnOF).The induced action of F ions transforms the MnO_(2)structure from the original cubic[MnO_(6)]octahedron into an asymmetric[Mn(OF)_(6)]octahedron with electron redistribution,and generates a localized charge imbalance along the O-Mn-F pathway,which promotes electron transfer from Mn to F direction,accelerates electron transfer,and reduces the energy barrier of ammonium ion diffusion.As a result,the prepared MnOF exhibited a maximum salt adsorption capacity of 144.3 mg g^(−1)and an exceptionally high salt adsorption rate of 18.25 mg g^(−1)min^(-1),along with outstanding cycling stability.Besides,ex/in situ characterizations reveal that in MnOF,the formation/breaking of hydrogen bond is accompanied by the insertion/deinsertion of NH_(4)^(+).Therefore,the rational introduction of highly electronegative anions provides a new direction for the development of advanced CDI electrode materials.
基金supported by the National Natural Science Foundation of China,No.81641048Research Project of Yan’an University,No.2023JBZR-011(both to LZ).
文摘Spinal cord injury is a severe neurological condition characterized by the permanent loss of nerve cell function and a failure in neural circuit reconstruction-key factors contributing to disability.Therefore,exploring effective strategies to promote the repair and regeneration of nerve cells after spinal cord injury is crucial for optimizing patient prognosis.The purpose of this paper is to conduct an in-depth review of the pathological changes in nerve cells after spinal cord injury and to present the state of research on the role of exercise training in promoting the repair and regeneration of nerve cells after spinal cord injury.In terms of the intrinsic growth capacity of neurons,disruptions in the dynamic balance between growth cones and the cytoskeleton,the dysregulation of transcription factors,abnormal protein signaling transduction,and altered epigenetic modifications collectively hinder axonal regeneration.Additionally,the microenvironment of neurons undergoes a series of complex changes,initially manifesting as edema,which may be exacerbated by spinal cord ischemia-reperfusion injury,further increasing the extent of nerve cell damage.The abnormal proliferation of astrocytes leads to the formation of glial scars,creating a physical barrier to nerve regeneration.The inflammatory response triggered by the excessive activation of microglia negatively impacts the process of nerve repair.Non-invasive interventions involving exercise training have shown significant potential in promoting nerve repair as part of a comprehensive treatment strategy for spinal cord injury.Specifically,exercise training can reshape the growth cone and cytoskeletal structures of neurons,regulate transcription factor activity,modulate protein signaling pathways,and influence epigenetic modifications,thereby activating the intrinsic repair mechanisms of neurons.Moreover,exercise training can regulate the activation state of astrocytes,optimize the inflammatory response and metabolic processes,promote astrocyte polarization,enhance angiogenesis,reduce glial scar formation,and modulate the expression levels of nerve growth factors.It also effectively helps regulate microglial activation,promotes axonal regeneration,and improves phagocytic function,thereby optimizing the microenvironment for nerve repair.In terms of clinical translation,we summarize the preliminary results of new drug research and development efforts,the development of innovative devices,and the use of exercise training in promoting clinical advancements in nerve repair following spinal cord injury,while considering their limitations and future application prospects.In summary,this review systematically analyzes findings relating to the pathological changes occurring in nerve cells after spinal cord injury and emphasizes the critical role of exercise training in facilitating the repair and regeneration of nerve cells.This work is expected to provide new ideas and methods for the rehabilitation of patients with spinal cord injury.
基金supported by grants from the National Natural Science Foundation of China [Nos.82474024,82293682 (82293680),82073953]the Nonprofit Central Research Institute Fund of Chinese Academy of Medical Sciences (No.2021-RC350-009)+1 种基金the CAMS Innovation Fund for Medical Sciences (No.2023-I2M-2-006)the Special Fund for the Construction of Qinghai Innovation Platform (No.2024-ZJ-T02)。
文摘Many labdane-related diterpenoids(LRDs) exhibit high values in drug development.Their diversity in structure and bioactivity,to a large extent,arise from oxidative modifications which are mainly catalyzed by cytochrome P450s(CYPs).The medicinal plant Euphorbia fischeriana Steud.is rich in LRDs with distinct scaffolds.Herein,we characterized three cytochrome P450s involved in LRD biosynthesis from this plant.Notably,CYP71D450 and CYP701A148 are two substrate-promiscuity CYPs.The former is the first example of CYPs which can oxidize C-3 of ent-atisane skeleton and ent-isopimara-7(8),15-diene,and the latter is the first example of CYPs which can oxidize C-19 of ent-abietane and ent-pimarane skeletons.This study expands the toolkit for bioproduction of diverse LRDs.
基金supported by the Basic Science Center Project of the National Natural Science Foundation of China(22388101)New Cornerstone Science Foundation(NCI202318)+6 种基金the National Natural Science Foundation of China(32171398 and T242200557)the National Key R&D Program of China(2023YFA1610200 and 2022YFA1603701)Beijing Nova Program(20220484060,20230484426,and 20240484661)Beijing Natural Science Foundation(F251001)Chinese Academy of Sciences Project for Young Scientists in Basic Research(YSBR-036)the One Hundred Talents Program of Chinese Academy of Sciences(E3G551R1ZX)Chinese Academy of Medical Sciences(CAMS)and Innovation Fund for Medical Sciences(CIFMS2019-I2M-5-018).
文摘Phosphatase and tensin homolog deleted on chromosome 10(PTEN)messenger RNA(mRNA)delivery has fueled a great hope for tumor immunotherapy via augmenting the immune sensitivity in many human cancers.However,therapeutic efficacy and clinical translation are limited by inadequate mRNA expression,insufficient immune stimulation and stringent storage requirements.Herein,inspired by the intrinsic properties of metal ions and exosomes,we developed a biomimetic delivery system(Mn-NP@PM)with superior stability for precise colorectal cancer immunotherapy.This platform employs adjuvant-metal-ion chelation for PTEN mRNA loading and PD-L1 antibodies(αPD-L1)-modified monocyte-macrophage membrane coating for mRNA protection and tumor targeting.Mn^(2+) was specifically selected due to its capacity for reversible mRNA binding through weak non-electrostatic interactions,facilitating efficient release,while simultaneously activating the stimulator of interferon genes(STING)pathway.Importantly,Mn-NP@PM exhibited membrane fusion for immediate cytosolic mRNA delivery,bypassing endo-lysosomal escape,optimizing transportation efficiency.Clinical-data-driven analyses further demonstrated that Mn-NP@PM-mediated PTEN restoration significantly increased T-cell infiltration and strengthened antitumor immunity in humanized patient derived xenograft(PDX)models.Collectively,this biomimetic,metal-ion-chelating,membrane-coated mRNA delivery system represents a versatile and clinically translatable strategy for personalized cancer immunotherapy.
基金supported by the National Key Research and Development Program of China(Grant Nos.2021YFA1401800,2022YFA1604200,2022YFA1403900,2023YFA1406002,2024YFA1408301 and 2024YFA1408100)the National Natural Science Foun-dation of China(Grant Nos.12488201,12374066,12374154,12494593)+2 种基金Quantum Science and Technology-National Science and Technology Major Project(Grant No.2021ZD0301800)CAS Superconducting Research Project(Grant No.SCZX-0101)the Synergetic Extreme Condition User Facility(SECUF).
文摘The spatially-resolved laser-based high resolution angle resolved photoemission spectroscopy(ARPES)measurements have been performed on the optimally-doped HgBa_(2)Ca_(2)Cu_(3)O_(8+δ)(Hg1223)superconductor with a T_(c) of 133 K.Two distinct regions are identified on the cleaved surface:the single Fermi surface region where only one Fermi surface is observed,and the double Fermi surface region where two Fermi surface sheets are resolved coming from both the inner(IP)and outer(OP)CuO_(2) planes.The electronic structure and superconducting gap are measured on both of these two regions.In both cases,the observed electronic states are mainly concentrated near the nodal region.The momentum dependence of the superconducting gap deviates from the standard d-wave form.These results indicate that the surface electronic structure of Hg1223 behaves more like that of underdoped cuprates.
基金supported by projects from the National Natural Science Foundation of China(81370977,81570796 and 81370018)by the Shanghai Science and Technology Committee(14411960900)
文摘Bone is an endocrine organ involved in modulating glucose homeostasis. The role of the bone formation marker osteocalcin （OCN） in predicting diabetes was reported, but with conflicting results. No study has explored the association between baseline bone resorption activity and incident diabetes or prediabetes during follow-up. Our objective was to examine the relationship between the baseline bone resorption marker crosslinked C-telopeptide of type I collagen （CTX） and glycemic dysregulation after 4 years. This longitudinal study was conducted in a university teaching hospital. A total of 195 normal glucose tolerant （NGT） women at baseline were invited for follow-up. The incidence of diabetes and prediabetes （collectively defined as dysglycemia） was recorded. A total of 128 individuals completed the 4-year study. The overall conversion rate from NGT to dysglycemia was 31.3%. The incidence of dysglycemia was lowest in the middle tertile [16.3% （95% confidence interval （CI）, 6.8%-30.70/0）] compared with the lower [31.0% （95% CI, 17.2%-46.1%）] and upper [46.5% （95% CI, 31.2%-62.6%）] tertiles of CTX, with a significant difference seen between the middle and upper tertiles （P = 0.002 5）. After adjusting for multiple confounding variables, the upper tertile of baseline CTX was associated with an increased risk of incident dysglycemia, with an odds ratio of 7.09 （95% CI, 1.73-28.99） when the middle tertile was the reference. Osteoclasts actively regulate glucose homeostasis in a biphasic model that moderately enhanced bone resorption marker CTX at baseline provides protective effects against the deterioration of glucose metabolism, whereas an overactive osteoclastic function contributes to an increased risk of subsequent dysglycemia.
基金supported by the China Major Science and Technology Program for Water Pollution Control and Treatment (No. 2012ZX07404-002)
文摘The combined fouling during ultrafiltration（UF） of surface water pretreated to different extents was investigated to disclose the roles of polysaccharides, proteins, and inorganic particles in UF membrane fouling. Both reversible and irreversible fouling decreased with enhanced pretreatment（biologically active carbon（BAC） treatment and sand filtration）. The sand filter effluent fouled the membrane very slowly. The UF membrane removed turbidity to less than 0.1 nephelometric turbidity unit（NTU）, reduced polysaccharides by 25.4%–29.9%, but rejected few proteins. Both polysaccharides and inorganic particles were detected on the fouled membranes, but inorganic particles could be effectively removed by backwashing. The increase of turbidity in the sand filter effluent to 3.05 NTU did not significantly increase the fouling rate, but an increase in the turbidity in the BAC effluent to6.11 NTU increased the fouling rate by more than 100%. The results demonstrated that the polysaccharide, not the protein, constituents of biopolymers were responsible for membrane fouling. Membrane fouling was closely associated with a small fraction of polysaccharides in the feed water. Inorganic particles exacerbated membrane fouling only when the concentration of fouling–inducing polysaccharides in the feed water was relatively high. The combined fouling was largely reversible, and polysaccharides were the predominant substances responsible for irreversible fouling.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB41010304)the National Key R&D Program of China (Grant No.2018YFC1503806)the National Natural Science Foundation of China (41874080, 41674168, 41874197)
文摘In a recent paper(Luo H et al.,2022),we found that the peak amplitudes of diurnal magnetic variations,measured during martian days(sols)at the InSight landing site,exhibited quasi Carrington-Rotation(qCR)periods at higher eigenmodes of the natural orthogonal components(NOC);these results were based on~664 sols of magnetic field measurements.However,the source of these periodic variations is still unknown.In this paper we introduce the neutral-wind driven ionospheric dynamo current model(e.g.,Lillis et al.,2019)to investigate the source.Four candidates-the draped IMF,electron density/plasma density,the neutral densities,and the electron temperature in the ionosphere with artificial qCR periodicity,are applied in the modeling to find the main factor likely to be causing the observed surface magnetic field variations that exhibit the same qCR periods.Results show that the electron density/plasma density,which controls the total conductivity in the dynamo region,appears to account for the greatest part of the surface qCR variations;its contribution reaches about 67.6%.The draped IMF,the neutral densities,and the electron temperature account,respectively,for only about 12.9%,10.3%,and 9.2%of the variations.Our study implies that the qCR magnetic variations on the Martian surface are due primarily to variations of the dynamo currents caused by the electron density variations.We suggest also that the timevarying fields with the qCR period could be used to probe the Martian interior's electrical conductivity structure to a depth of at least 700 km.
基金financially supported by the National Natural Science Foundation of China(Grant No.52150410427)the Key Support Program for Foreign Experts of the Ministry of Science and Technology of the People's Republic of China(No.wgxz2022057)funding for post-doctoral work by the Department of Human Resources and Social Security of Hubei Province。
文摘Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not been very effective in high-temperature drilling operations. Thermo-responsive Janus nanocomposites are expected to strongly interact with clay particles from the inward hemisphere of nanomaterials, which drive the establishment of a tighter hydrophobic membrane over the shale surface at the outward hemisphere under geothermal conditions for shale stabilization. This work combines the synergistic benefits of thermo-responsive and zwitterionic nanomaterials to synchronously enhance the chemical inhibitions and plugging performances in shale under harsh conditions. A novel thermoresponsive Janus nanosilica(TRJS) exhibiting zwitterionic character was synthesized, characterized,and assessed as shale stabilizer for WBDFs at high temperatures. Compared to pristine nanosilica(Si NP)and symmetrical thermo-responsive nanosilica(TRS), TRJS exhibited anti-polyelectrolyte behaviour, in which electrolyte ions screened the electrostatic attraction between the charged particles, potentially stabilizing nanomaterial in hostile shaly environments(i.e., up to saturated brine or API brine). Macroscopically, TRJS exhibited higher chemical inhibition than Si NP and TRS in brine, prompting a better capability to control pressure penetration. TRJS adsorbed onto the clay surface via chemisorption and hydrogen bonding, and the interactions became substantial in brine, according to the results of electrophoretic mobility, surface wettability, and X-ray diffraction. Thus, contributing to the firm trapping of TRJS into the nanopore structure of the shale, triggering the formation of a tight hydrophobic membrane over the shale surface from the outward hemisphere. The addition of TRJS into WBDF had no deleterious effect on fluid properties after hot-treatment at 190℃, implying that TRJS could find potential use as a shale stabilizer in WBDFs in hostile environments.
基金supported by the Basic Key Research Program of Basic Strengthening Plan(No.2021-JCJQ-ZD-075-11)the CISRI Independent Research and Development Programs(Nos.21H62580Z and No.23H60450Z)the National Natural Science Foundation of China(Grant No.52374365).
文摘Wire arc additive manufacturing(WAAM)technique is a promising approach to producing large-scale metal components due to high deposition efficiency and low production cost.However,fundamental research about WAAM-processed Al-Mg-Sc-Zr alloy was still fewer.In this study,Al-6.54Mg-0.36Sc-0.11Zr(wt%)components were successfully manufactured by WAAM with an interlayer temperature at 100℃(named IW)and continuous printing(named CP),and the corresponding porosity,microstructure,and mechanical properties of components were studied in detail.The porosity of components as-deposited was relatively low,about 0.385%and 0.116%,respectively.The microstructures of the two components exhibited the same distribution characteristics in XZ and YZ planes:fine equiaxed grains(FEG)at remelted zone+FEG and coarse equiaxed grain(CEG)alternative distribution at middle zone+FEG at the top zone of the molten pool.The average grain size of component IW was about 10.51±6.01μm,and that of component CP significantly increased,to about 11.85±5.86μm.The short-circuit transition mode of cold metal transfer technology and the heterogeneous nucleation effect of primary Al3(Sc,Zr)and Al3(Sc,Zr,Ti)phases together promoted the formation of equiaxed grains and refined the microstructures.After heat treatment at 325℃and 6 h,nano-Al3Sc precipitated with a size of about 15-50 nm.The yield strength(YS)of components IW and CP increased from 171±3 to 261±1 MPa and 168±7 to 240±17 MPa,respectively.Component IW had the highest ultimate tensile strength,about 400±1 MPa.For WAAMprocessed Al-Mg-Sc-Zr alloys,the contribution of the strengthening mechanism to YS was solid solution strengthening>precipitation strengthening>fine grain strengthening>dislocation strengthening.
基金supported by grants from the “919 Tumor Pre-cision Medicine Public Welfare Foundation”the International Sci-ence and Technology Cooperation Projects(2015DFA30650 and 2016YFE0107100)+2 种基金Chinese Academy of Medical Sciences(CAMS) Innovation Fund for Medical Sciences(CIFMS)(2017-I2M-4-003)the Capital Special Research Project for the Clinical Application(Z151100004015170)Beijing Natural Science Foundation Haid-ian Joint Fund Frontier Project(L172055)
文摘Hepatobiliary tumor (HBT), one of the leading causes of cancer deaths globally, is more frequent in East Asia including China [1].HBTincludeslivercancer,cholangiocarcinomaandgallbladder cancer.HBTburdenvariesmarkedlybygenderandgeographic regionduetotheexposureofriskfactors.MajorityofthehepatocellularcarcinomasareassociatedwithhepatitisB-typevirus
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0300300,2016YFA0300600,2017YFA0302900,2018YFA0704200,2018YFA0305600,and 2019YFA0308000)the National Natural Science Foundation of China(Grant Nos.11888101,11922414,and 11874405)+2 种基金the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant Nos.XDB25000000 and XDB33010300)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2017013)the Research Program of Beijing Academy of Quantum Information Sciences(Grant No.Y18G06)。
文摘Super-high resolution laser-based angle-resolved photoemission measurements are carried out on LiFeAs superconductor to investigate its electron dynamics. Three energy scales at ~ 20 meV, ~ 34 meV, and ~ 55 meV are revealed for the first time in the electron self-energy both in the superconducting state and normal state. The ~ 20 meV and ~ 34 meV scales can be attributed to the coupling of electrons with sharp bosonic modes which are most likely phonons. These observations provide definitive evidence on the existence of mode coupling in iron-based superconductors.
基金This study was conducted in the Key Laboratory of Soybean Biology of Chinese Education Ministry,and financially supported by National Natural Science Foundation of China(32072086,31771820)Heilongjiang Province Natural Science Foundation(ZD2020C002).
文摘High and stable yield is the main goal of soybean genetic improvement.In this study,association analysis was used to detect the quantitative trait loci(QTL)for the plant height,and soybean growth period using 182 SSR markers in the RIL population of 136 F_(4:8) lines,which developed from a cross between photoperiod-insensitive cultivar‘Dongnong 47’and photoperiod-sensitive variety PI317334–B.The results showed that 33 QTLs related to soybean growth period and plant height traits were detected by compound interval mapping,and were located on 12 linkage groups including N,C1,C2,J,D1a,B2,E,G,A2,O,L,I,with the contribution rate of 7.85–33.84%.These QTL loci and linkage markers related to soybean photoperiod sensitivity,would be helpful to identify key genes that control soybean photoperiod sensitivity,and provide an important basis for the breeding of new photoperiod-insensitive soybean varieties based on molecular design breeding.
基金This study was supported by Tianjin Municipal Science and Technology Project(Grant No.16ZXHLSY00120).
文摘Objective:To explore the anti-tumor of breast cancer metastasis suppressor 1(BRMS1)on renal cell carcinoma.Methods:BRSM1 stabilized overexpressed and knockdown cell models were constructed to detect the effect of BRMS1 overexpression and knockdown on viability rate of 769-P cells.Activation of PI3K/AKT-mTOR-NFκB signaling pathway,expression of cellular apoptosis-related proteins,DNA damage repair-related proteins and angiogenesis-related proteins were detected using Western blotting analysis.Results:The viability rate of 769-P cells were significantly decreased in BRMS1 overexpression cells while significantly increased in BRMS1 knockdown cells(P<0.05).The activity of PI3K/AKT-mTOR-NFκB signaling pathway was significantly inhibited with BRMS1 overexpression(P<0.05),and expression of BAX was significantly increased with significantly decreased expression of Bcl-2(P<0.05).Besides,BRMS1 overexpression could significantly decrease the expression of DNA damage repair-related proteins and angiogenesis and cell-matrix degradation related proteins(P<0.05).Conclusion:BRMS1 induces apoptosis of renal cell carcinoma and performs an anti-tumor effect via inhibition of PI3K/AKT-mTOR-NFκB signaling pathway,expression of DNA damage repair-related proteins and angiogenesis-related proteins.
基金supported by National Key Research and Development Program(Grant No.2024YFB4609700)the National Natural Science Foundation of China(Grant No.52374365)。
文摘Wire arc additive manufacturing(WAAM)is one of the most promising approaches to manufacturing large and complex metal components owing to its low cost and high efficiency.However,pores and coarse columnar grains caused by thermal accumulation in WAAM significantly decrease the strength and increase the anisotropy,preventing the achievement of both high strength and isotropy.In this study,the strength and anisotropy of AlMg-Sc-Zr alloys were improved by regulating heat input.The results indicated that as the heat input increased from 60 to 99 J/mm,all the components had lower porosity(lower than 0.04%),the size of the Al_(3)(Sc_(1-x),Zr_(x))phases decreased,and the number density increased.The average grain size gradually decreased,and the grain morphologies transformed from coarse equiaxed grain(CEG)+fine equiaxed grain(FEG)to FEG owing to the increase in Al_(3)(Sc_(1-x),Zr_(x))phases with increasing heat input.After heat treatment at 325℃for 6 h,high-density dispersed Al_(3)Sc phases(<10 nm)precipitated.The alloy possessed the highest strength at 79 J/mm,ultimate tensile strength(UTS)of approximately 423±3 MPa,and in-plane anisotropy of approximately 4.3%.At a heat input of 99 J/mm,the in-plane anisotropy decreased to 1.2%and UTS reached 414±5 MPa.The reduction in the CEG prolonged the crack propagation path,which improved the UTS in the vertical direction and reduced the anisotropy.Theoretical calculations indicated that the main strengthening mechanisms were solid solution and precipitation strengthening.This study lays the theoretical foundations for WAAM-processed high-strength and isotropic Al alloy components.
文摘High-precision magnetic field measurements are crucial for understanding Earth’s internal structure,space environment,and dynamic geomagnetic variations.Data from the Fluxgate Magnetometer (FGM) on the Macao Science Satellite-1A (MSS-1A),added to data from other space-based magnetometers,should increase significantly the ability of scientists to observe changes in Earth’s magnetic field over time and space.Additionally,the MSS-1A’s FGM is intended to help identify magnetic disturbances affecting the spacecraft itself.This report focuses on the in-flight calibration of the MSS-1 FGM.A scalar calibration,independent of geomagnetic field models,was performed to correct offsets,sensitivities,and misalignment angles of the FGM.Using seven months of data,we find that the in-flight calibration parameters show good stability.We determined Euler angles describing the rotational relationship between the FGM and the Advanced Stellar Compass (ASC) coordinate system using two approaches:calibration with the CHAOS-7 geomagnetic field model,and simultaneous estimation of Euler angles and Gaussian spherical harmonic coefficients through self-consistent modeling.The accuracy of Euler angles describing the rotation was better than 18 arcsec.The calibrated FGM data exhibit good agreement with the calibrated data of the Vector Field Magnetometer (VFM),which is the primary vector magnetometer of the satellite.These calibration efforts have significantly improved the accuracy of the FGM measurements,which are now providing reliable data for geomagnetic field studies that promise to advance our understanding of the Earth’s magnetic environment.
基金supported by the Fundamental Research Funds for the Central Universities(2024KYJD2006).
文摘We consider the multiplicity of solutions to a p(x)-Laplacian problem involving supercritical Sobolev growth via Ricceri’s principle.By means of truncation combined with De Giorgi iteration,we can extend the results of subcritical and critical growth to supercritical growth and obtain at least three solutions to the p(x)-Laplacian problem.
