Influenza A virus(IAV) has a wide host range,including wild birds,poultry,various mammals,and even humans(Xu et al.2024).Currently,two subtypes of canine influenza virus(CIV),H3N8 and H3N2,are primarily circulating in...Influenza A virus(IAV) has a wide host range,including wild birds,poultry,various mammals,and even humans(Xu et al.2024).Currently,two subtypes of canine influenza virus(CIV),H3N8 and H3N2,are primarily circulating in dogs.The H3N8 CIV was introduced from horses into dogs in 2004(Crawford et al.2005),while the H3N2 CIV originated from chickens in Asia in 2007(Song et al.2008).In China,H3N2 is the predominant CIV subtype,with a prevalence rate of up to 5.63% in the canine population,as reported by Chen et al.(2023).CIV infection typically manifests with symptoms such as coughing,sneezing,runny nose,and fever but is rarely fatal.However,co-infection with other pathogens(e.g.,Streptococcus,Mycoplasma or canine parainfluenza virus) can exacerbate symptoms and lead to lethal outcomes(Yondo et al.2023).展开更多
Microbial fouling is an important challenge in water recovery system of manned spacecrafts for longer term missions.Microbial fouling of 5A06 aluminium alloy induced by typical extreme environment-resistant bacteria i...Microbial fouling is an important challenge in water recovery system of manned spacecrafts for longer term missions.Microbial fouling of 5A06 aluminium alloy induced by typical extreme environment-resistant bacteria in oligotrophic solutions of simulated condensate of manned spacecraft was investigated.Bacillus cereus showed poor survival ability to oligotrophic environments,and a small amount of remaining live B.cereus cells mainly existed in the form of spores without forming biofilms.And when B.cereus was mixed cultured with Cupriavidus metallidurans,the system was mainly affected by C.metallidurans biofilms rather than B.cereus cells.C.metallidurans could promote the thickness of passive films of aluminum alloy,so C.metallidurans posed a minor threat to the corrosion of 5A06 aluminum alloy.However,C.metallidurans showed strong adaptability to oligotrophic environments and formed a large number of biofilms.And the contamination threat of C.metallidurans still dominated even cultured with B.cereus.Even when cultured with B.cereus,the threat of contamination from C.metallidurans still pre-dominates.Therefore,C.metallidurans would pose a threat of microbial fouling to the oligotrophic water recovery system of manned spacecrafts.展开更多
Uranium-reducing bacteria were immobilized with sodium alginate, anthraquinone-2,6-disulfonate（AQDS）, and carbon nanotubes（CNTs）. The effects of different AQDS-CNTs contents, U（Ⅳ） concentrations, and metal ions...Uranium-reducing bacteria were immobilized with sodium alginate, anthraquinone-2,6-disulfonate（AQDS）, and carbon nanotubes（CNTs）. The effects of different AQDS-CNTs contents, U（Ⅳ） concentrations, and metal ions on U（Ⅳ） reduction by immobilized beads were examined. Over 97.5% U（Ⅵ）（20 mg/L） was removed in 8 hr when the beads were added to 0.7% AQDS-CNTs, which was higher than that without AQDS-CNTs. This result may be attributed to the enhanced electron transfer by AQDS and CNTs. The reduction of U（Ⅵ） occurred at initial U（Ⅵ） concentrations of 10 to 100 mg/L and increased with increasing AQDS-CNT content from 0.1% to 1%. The presence of Fe（Ⅲ）, Cu（Ⅱ） and Mn（Ⅱ）slightly increased U（Ⅵ） reduction, whereas Cr（Ⅵ）, Ni（Ⅱ）, Pb（Ⅱ）, and Zn（Ⅱ） significantly inhibited U（Ⅵ） reduction. After eight successive incubation-washing cycles or 8 hr of retention time（HRT） for 48 hr of continuous operation, the removal efficiency of uranium was above 90% and 92%, respectively. The results indicate that the AQDS-CNT/AL/cell beads are suitable for the treatment of uranium-containing wastewaters.展开更多
Phototheranostics have attracted tremendous attention in cancer diagnosis and treatment because of the noninvasiveness and promising effectiveness.Developing advanced phototheranostic agents with long emission wavelen...Phototheranostics have attracted tremendous attention in cancer diagnosis and treatment because of the noninvasiveness and promising effectiveness.Developing advanced phototheranostic agents with long emission wavelength,excellent biocompatibility,great tumor-targeting capability,and efficient therapeutic effect is highly desirable.However,the mutual constraint between imaging and therapeutic functions usually hinders their wide applications in biomedical field.To balance this contradiction,we herein rationally designed and synthesized three novel tumor-targeted NIR-Ⅱ probes(QR-2PEG_(321),QR-2PEG_(1000),and QR-2PEG_(5000)) by conjugating three different chain lengths of PEG onto an integrin α_(v)β_(3)-targeted NIR-Ⅱ heptamethine cyanine fluorophore,respectively.In virtue of the essential amphiphilic characteristics of PEG polymers,these probes display various degree of aggregation in aqueous buffer accompanying with differential NIR-Ⅱ imaging and photothermal(PTT) therapeutic performance.Both in vitro and in vivo results have demonstrated that probe QR-2PEG_(5000) has the best NIR-Ⅱ imaging performance with prominent renal clearance,whereas QR-2PEG_(321)possesses excellent photoacoustic signal as well as PTT effect,which undoubtedly provides a promising toolbox for tumor diagnosis and therapy.We thus envision that these synthesized probes have great potential to be explored as a toolkit for precise diagnosis and treatment of malignant tumors.展开更多
In order to alleviate the pressure on the supply of lithium resources, this research proposes the use of binary/ternary collectors with high selectivity and collecting ability to enhance the flotation purification of ...In order to alleviate the pressure on the supply of lithium resources, this research proposes the use of binary/ternary collectors with high selectivity and collecting ability to enhance the flotation purification of low-grade zinnwaldite ore. The binary collector is a mixture of dodecylamine polyoxyethylene ether and DL-2-octanol. A binary collector is added first, followed by sodium oleate, known as a ternary collector. Under acidic conditions, the recovery of Li2O in the concentrate was increased by 8.26% with the binary collector and 13.70% with the ternary collector, compared to the dodecylamine polyoxyethylene ether. The binary collector enhanced the dispersibility of the single collector, while co-adsorption strengthened the hydrophobic nature of the zinnwaldite surface. Consequently, zinnwaldite particles,after the application of binary collector, displayed inter-particle flocculation and attachment to bubbles within 60×10^(-9)m compared to other particles. Ternary collector exhibited the capacity to lower critical micelle concentration and surface tension, subsequently inducing a denser and thicker hydrophobic layer through electrostatic forces, hydrophobic interactions, and chemical reactions. The objective of this research is to facilitate the recovery of lithium resources from low-grade ores in order to meet the needs of sustainable development.展开更多
H10 subtype avian influenza viruses(AIV)have been circulating in China for 40 years.H10 AIVs in China have expanded their host range from wild birds to domestic poultry and mammals,even human.Most of the H10 subtype A...H10 subtype avian influenza viruses(AIV)have been circulating in China for 40 years.H10 AIVs in China have expanded their host range from wild birds to domestic poultry and mammals,even human.Most of the H10 subtype AIVs reported in China were isolate from the southeast part.We isolated an H10N3 AIV,A/Chicken/Liaoning/SY1080/2021(SY1080),from live poultry market(LPM)in Liaoning Province of the Northeast China.SY1080replicated efficiently in mice lungs and nasal turbinates without prior adaptation.We systematically compared SY1080 with other H10 subtype isolates in China.Phylogenetic analysis showed that SY1080 and most of the H10strains belonged to the Eurasian lineage.H10 AIVs in China have formed 63 genotypes.SY1080 as well as the H10N3 strains from human infections belonged to G60 genotype.H10Nx AIV acquired multiple mammalian adaptive and virulence related mutations during circulation and the recent reassortants derived internal genes from chicken H9N2 AIVs.The H10Nx subtypes AIVs posed potential threat to public health.These results suggested we should strengthen the surveillance and evaluation of H10 subtype strains.展开更多
To investigate the effect of nitrogen on the photoluminescence properties of carbon quantum dots (CO Ds), N-doped carbon quantum dots (N-CQDs)were synthesized by one-step hydrothermal treatment using biomass tar as th...To investigate the effect of nitrogen on the photoluminescence properties of carbon quantum dots (CO Ds), N-doped carbon quantum dots (N-CQDs)were synthesized by one-step hydrothermal treatment using biomass tar as the carbon precursor.As an inevitable organic pollutant,the unsaturated bonds in biomass tar,such as carboxylic acids,aldehydes,and aromatics,are favorable for formation of the graphitic carbon lattice.The obtained N-CQDs are spherical with an average particle size of 2.64nm and the crystal lattice spacing is 0.25nm,corresponding to the (100)facet of graphitic carbon.The N-CQDs emit bright blue photoluminescence under 365nm ultraviolet light,and they have excellent water solubility and stability with a high quantum yield of 26.1%.Coordination between the functional groups on the N-CQD surface and Fe^3+ ions is promoted because of the improved electronic properties and surface chemical reactivity caused by N atoms,leading to a significant fluorescence quenching effect of the N-CQDs in the presence of Fe^3+ions with high selectivity and sensitivity.There is a linear relationship between In (Fo/F)and the Fe^3+ concentration in the N-CQD concentration range 0.06-1400μmol/L with a detection limit of 60nmol/L, showing that the N-CQ.Ds have great potential as a fluorescent probe for Fe^3+detection.展开更多
Controlled drug delivery holds great potential for effective tumor treatment owing to the merits of overcoming drug resistance and improving therapeutic efficacy while minimizing systemic toxicity.However,accurate and...Controlled drug delivery holds great potential for effective tumor treatment owing to the merits of overcoming drug resistance and improving therapeutic efficacy while minimizing systemic toxicity.However,accurate and controllable delivery of chemotherapeutics into tumor tissue with high efficiency remains a huge challenge.Taking advantage of the UV-emitting characteristics of upconversion nanoparticles(UCNPs),herein we for the first time report an MMP-2 enzyme and near infrared(NIR)dual-mediated sequential drug delivery and in-situ immobilization(ENDDI)system that is fabricated by decorating UCNPs with MMP-2 responsive and photocrosslinkable peptide bearing anticancer drug doxorubicin(DOX)for overcoming multidrug resistance.Upon cleavage with tumor-specific MMP-2,the peptide fragment containing a photolabile benzophenone(BP)and DOX could be released and in-situ immobilized within the tumor through the covalent crosslinking reaction between BP and neighboring biomolecules under the excitation of converted UVemission from UCNPs,which remarkably blocks the exocytosis of DOX leading to prolonged drug retention,achieving significant suppression of DOX-resistant breast tumors.Our current dual stimuli-mediated sequential drug delivery and in-situ immobilization represent a generalizable strategy for the effective treatment of multidrug resistant tumors.展开更多
Influencing factors on bioaccumulation of Ni by Synechcoccus were studied in this paper. The equilibration time of Ni bioaccumulation was about 80 min in aqueous solution. Bioaccumulation quantity reached maximum when...Influencing factors on bioaccumulation of Ni by Synechcoccus were studied in this paper. The equilibration time of Ni bioaccumulation was about 80 min in aqueous solution. Bioaccumulation quantity reached maximum when mass ratio of Ni to dry weight concentration of Synechcoccus was 16-18%. Bioaccumulation quantity increased with increasing pH. The optimum pH was 9-10 and higher pH led to precipitation of Ni（OH）2. Bioaccumulation quantity was also influenced by temperature and light intensity reaching their optima at 35℃ and 3 000 lx respectively. Bioaccumulation of nonliving algae was larger than that of living algae.展开更多
Electro-optic modulators,which convert electrical signals onto the transmission light,are key devices in electro-optic modulating systems.Modulation efficiency is one of the most important parameters of an electro-opt...Electro-optic modulators,which convert electrical signals onto the transmission light,are key devices in electro-optic modulating systems.Modulation efficiency is one of the most important parameters of an electro-optic modulator,which directly determines the footprint and power consumption of the device.Generally,modulation efficiency strongly depends on the electro-optic response of the crystal.The Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIN-PMN-PT)single crystal with giant electro-optic coefficient(λ_(c))and high transparency indicates the potential to achieve greatly enhanced modulation efficiency.In this study,a prototype PIN-PMN-PT phase modulator was fabricated based on a titanium(Ti)in-diffusion waveguide,which is reported for the first time.The influences of titanium in-diffusion on the composition and domain structure of the PIN-PMN-PT single crystal were studied by transmission electron microscopy(TEM)and piezoelectric force microscopy(PFM),respectively.Finally,a half-wave voltage(V_(π))of 2.3 V was obtained using a device with 6-mm-long(L)electrodes.Furthermore,the electro-optic modulation efficiency(V_(π)L)was calculated as 1.38 V-cm,which was approximately one order of magnitude lower than that of commercial lithium niobate(LiNbO_(3),LN)phase modulators.Such enhanced modulation efficiency indicates more compact device and lower power consumption,which is of great significance for electro-optic modulation systems used in micro-fiber gyroscope,integrated photonic devices,etc.展开更多
RNA interfering therapy has emerged as a promising therapeutic modality to treat cancer.The specific and efficient delivery of RNA into a tumor is crucial for achieving effective cancer gene therapy but remains a huge...RNA interfering therapy has emerged as a promising therapeutic modality to treat cancer.The specific and efficient delivery of RNA into a tumor is crucial for achieving effective cancer gene therapy but remains a huge challenge.Herein,we report a novel furin-responsive small interfering RNA(siRNA)delivery vehicle with multiple functions for colorectal tumor treatment.A peptide-based siRNA delivery vehicle RVRR-P18-Gd,consisting of furin enzyme-specific peptide substrate Arg-Val-Arg-Arg(RVRR)with positive charge for siRNA binding,a Gd(III)chelated 1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴-tetraacetic acid(DOTA)(DOTA-Gd)for magnetic resonance imaging,and purpurin 18 as photosensitizer for photodynamic therapy(PDT),was rationally designed and synthesized.Taking advantage of the cationic amphiphilic feature,RVRR-P18-Gd molecules spontaneously self-assembled with negatively charged Hif-1αsiRNA into stable nanoparticles via attractive electrostatic interaction,which effectively prevented siRNA degradation by nucleases,prolonged the circulation half-life,and enhanced tumor accumulation.Moreover,the specific release of Hif-1αsiRNA mediated by endogenous furin significantly downregulated Hif-1αexpression in colorectal cancer cells,resulting in enhanced therapeutic susceptibility,and with the PDT effect,effectively suppressed HCT116 tumor growth in living mice.This work highlights a powerful and universal approach to precisely deliver siRNA to targeted tumors for efficient synergistic therapy.展开更多
基金supported by the National Key Research and Development Program of China (2021YFD1800200)the National Natural Science Foundation of China (32170539)。
文摘Influenza A virus(IAV) has a wide host range,including wild birds,poultry,various mammals,and even humans(Xu et al.2024).Currently,two subtypes of canine influenza virus(CIV),H3N8 and H3N2,are primarily circulating in dogs.The H3N8 CIV was introduced from horses into dogs in 2004(Crawford et al.2005),while the H3N2 CIV originated from chickens in Asia in 2007(Song et al.2008).In China,H3N2 is the predominant CIV subtype,with a prevalence rate of up to 5.63% in the canine population,as reported by Chen et al.(2023).CIV infection typically manifests with symptoms such as coughing,sneezing,runny nose,and fever but is rarely fatal.However,co-infection with other pathogens(e.g.,Streptococcus,Mycoplasma or canine parainfluenza virus) can exacerbate symptoms and lead to lethal outcomes(Yondo et al.2023).
基金supported by the National Natural Science Foundation of China(Nos.51971032,52371048,and 52071019).
文摘Microbial fouling is an important challenge in water recovery system of manned spacecrafts for longer term missions.Microbial fouling of 5A06 aluminium alloy induced by typical extreme environment-resistant bacteria in oligotrophic solutions of simulated condensate of manned spacecraft was investigated.Bacillus cereus showed poor survival ability to oligotrophic environments,and a small amount of remaining live B.cereus cells mainly existed in the form of spores without forming biofilms.And when B.cereus was mixed cultured with Cupriavidus metallidurans,the system was mainly affected by C.metallidurans biofilms rather than B.cereus cells.C.metallidurans could promote the thickness of passive films of aluminum alloy,so C.metallidurans posed a minor threat to the corrosion of 5A06 aluminum alloy.However,C.metallidurans showed strong adaptability to oligotrophic environments and formed a large number of biofilms.And the contamination threat of C.metallidurans still dominated even cultured with B.cereus.Even when cultured with B.cereus,the threat of contamination from C.metallidurans still pre-dominates.Therefore,C.metallidurans would pose a threat of microbial fouling to the oligotrophic water recovery system of manned spacecrafts.
基金supported by the China Ocean Mineral Resources Research Program (No. DY125-15-T-08)the National Natural Sciences Foundation of China (Nos. 21176026 21176242)
文摘Uranium-reducing bacteria were immobilized with sodium alginate, anthraquinone-2,6-disulfonate（AQDS）, and carbon nanotubes（CNTs）. The effects of different AQDS-CNTs contents, U（Ⅳ） concentrations, and metal ions on U（Ⅳ） reduction by immobilized beads were examined. Over 97.5% U（Ⅵ）（20 mg/L） was removed in 8 hr when the beads were added to 0.7% AQDS-CNTs, which was higher than that without AQDS-CNTs. This result may be attributed to the enhanced electron transfer by AQDS and CNTs. The reduction of U（Ⅵ） occurred at initial U（Ⅵ） concentrations of 10 to 100 mg/L and increased with increasing AQDS-CNT content from 0.1% to 1%. The presence of Fe（Ⅲ）, Cu（Ⅱ） and Mn（Ⅱ）slightly increased U（Ⅵ） reduction, whereas Cr（Ⅵ）, Ni（Ⅱ）, Pb（Ⅱ）, and Zn（Ⅱ） significantly inhibited U（Ⅵ） reduction. After eight successive incubation-washing cycles or 8 hr of retention time（HRT） for 48 hr of continuous operation, the removal efficiency of uranium was above 90% and 92%, respectively. The results indicate that the AQDS-CNT/AL/cell beads are suitable for the treatment of uranium-containing wastewaters.
基金financial support from the Training Program of the Major Research Plan of the National Natural Science Foundation of China (No. 91959123)National Natural Science Foundation of China (No. 22077092)+2 种基金Key Research and Development Program of Social Development of Jiangsu Province (No. BE2018655)the Open Project Program of the State Key Laboratory of Radiation Medicine and Protection (Nos. GZK1202132, GZK1202140 and GZK1202017)funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘Phototheranostics have attracted tremendous attention in cancer diagnosis and treatment because of the noninvasiveness and promising effectiveness.Developing advanced phototheranostic agents with long emission wavelength,excellent biocompatibility,great tumor-targeting capability,and efficient therapeutic effect is highly desirable.However,the mutual constraint between imaging and therapeutic functions usually hinders their wide applications in biomedical field.To balance this contradiction,we herein rationally designed and synthesized three novel tumor-targeted NIR-Ⅱ probes(QR-2PEG_(321),QR-2PEG_(1000),and QR-2PEG_(5000)) by conjugating three different chain lengths of PEG onto an integrin α_(v)β_(3)-targeted NIR-Ⅱ heptamethine cyanine fluorophore,respectively.In virtue of the essential amphiphilic characteristics of PEG polymers,these probes display various degree of aggregation in aqueous buffer accompanying with differential NIR-Ⅱ imaging and photothermal(PTT) therapeutic performance.Both in vitro and in vivo results have demonstrated that probe QR-2PEG_(5000) has the best NIR-Ⅱ imaging performance with prominent renal clearance,whereas QR-2PEG_(321)possesses excellent photoacoustic signal as well as PTT effect,which undoubtedly provides a promising toolbox for tumor diagnosis and therapy.We thus envision that these synthesized probes have great potential to be explored as a toolkit for precise diagnosis and treatment of malignant tumors.
基金supported by the National Key Research and Development Program of China(No.2023YFC2811403).
文摘In order to alleviate the pressure on the supply of lithium resources, this research proposes the use of binary/ternary collectors with high selectivity and collecting ability to enhance the flotation purification of low-grade zinnwaldite ore. The binary collector is a mixture of dodecylamine polyoxyethylene ether and DL-2-octanol. A binary collector is added first, followed by sodium oleate, known as a ternary collector. Under acidic conditions, the recovery of Li2O in the concentrate was increased by 8.26% with the binary collector and 13.70% with the ternary collector, compared to the dodecylamine polyoxyethylene ether. The binary collector enhanced the dispersibility of the single collector, while co-adsorption strengthened the hydrophobic nature of the zinnwaldite surface. Consequently, zinnwaldite particles,after the application of binary collector, displayed inter-particle flocculation and attachment to bubbles within 60×10^(-9)m compared to other particles. Ternary collector exhibited the capacity to lower critical micelle concentration and surface tension, subsequently inducing a denser and thicker hydrophobic layer through electrostatic forces, hydrophobic interactions, and chemical reactions. The objective of this research is to facilitate the recovery of lithium resources from low-grade ores in order to meet the needs of sustainable development.
基金supported by the National Key Research and Development Program of China(2021YFD1800200)the National Natural Science Foundation of China(32170539,32000357)Liaoning Revitalization Talents Program,China(XLYC2007114)。
文摘H10 subtype avian influenza viruses(AIV)have been circulating in China for 40 years.H10 AIVs in China have expanded their host range from wild birds to domestic poultry and mammals,even human.Most of the H10 subtype AIVs reported in China were isolate from the southeast part.We isolated an H10N3 AIV,A/Chicken/Liaoning/SY1080/2021(SY1080),from live poultry market(LPM)in Liaoning Province of the Northeast China.SY1080replicated efficiently in mice lungs and nasal turbinates without prior adaptation.We systematically compared SY1080 with other H10 subtype isolates in China.Phylogenetic analysis showed that SY1080 and most of the H10strains belonged to the Eurasian lineage.H10 AIVs in China have formed 63 genotypes.SY1080 as well as the H10N3 strains from human infections belonged to G60 genotype.H10Nx AIV acquired multiple mammalian adaptive and virulence related mutations during circulation and the recent reassortants derived internal genes from chicken H9N2 AIVs.The H10Nx subtypes AIVs posed potential threat to public health.These results suggested we should strengthen the surveillance and evaluation of H10 subtype strains.
基金Major Science and Technology Program for Water Pollution Control and Treatment (2015ZX07205-003)the China Ocean Mineral Resources Research &Development Program (DY125-15-T-08)the National Natural Science Foundation of China (21176026,21176242).
文摘To investigate the effect of nitrogen on the photoluminescence properties of carbon quantum dots (CO Ds), N-doped carbon quantum dots (N-CQDs)were synthesized by one-step hydrothermal treatment using biomass tar as the carbon precursor.As an inevitable organic pollutant,the unsaturated bonds in biomass tar,such as carboxylic acids,aldehydes,and aromatics,are favorable for formation of the graphitic carbon lattice.The obtained N-CQDs are spherical with an average particle size of 2.64nm and the crystal lattice spacing is 0.25nm,corresponding to the (100)facet of graphitic carbon.The N-CQDs emit bright blue photoluminescence under 365nm ultraviolet light,and they have excellent water solubility and stability with a high quantum yield of 26.1%.Coordination between the functional groups on the N-CQD surface and Fe^3+ ions is promoted because of the improved electronic properties and surface chemical reactivity caused by N atoms,leading to a significant fluorescence quenching effect of the N-CQDs in the presence of Fe^3+ions with high selectivity and sensitivity.There is a linear relationship between In (Fo/F)and the Fe^3+ concentration in the N-CQD concentration range 0.06-1400μmol/L with a detection limit of 60nmol/L, showing that the N-CQ.Ds have great potential as a fluorescent probe for Fe^3+detection.
基金supported by the National Natural Science Foundation of China(22077092)the Training Program of the Major Research Plan of the National Natural Science Foundation of China(91959123)+1 种基金the Open Project Program of the State Key Laboratory of Radiation Medicine and Protection(GZK1202132,GZK1202017,GZK1202140)the Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘Controlled drug delivery holds great potential for effective tumor treatment owing to the merits of overcoming drug resistance and improving therapeutic efficacy while minimizing systemic toxicity.However,accurate and controllable delivery of chemotherapeutics into tumor tissue with high efficiency remains a huge challenge.Taking advantage of the UV-emitting characteristics of upconversion nanoparticles(UCNPs),herein we for the first time report an MMP-2 enzyme and near infrared(NIR)dual-mediated sequential drug delivery and in-situ immobilization(ENDDI)system that is fabricated by decorating UCNPs with MMP-2 responsive and photocrosslinkable peptide bearing anticancer drug doxorubicin(DOX)for overcoming multidrug resistance.Upon cleavage with tumor-specific MMP-2,the peptide fragment containing a photolabile benzophenone(BP)and DOX could be released and in-situ immobilized within the tumor through the covalent crosslinking reaction between BP and neighboring biomolecules under the excitation of converted UVemission from UCNPs,which remarkably blocks the exocytosis of DOX leading to prolonged drug retention,achieving significant suppression of DOX-resistant breast tumors.Our current dual stimuli-mediated sequential drug delivery and in-situ immobilization represent a generalizable strategy for the effective treatment of multidrug resistant tumors.
文摘Influencing factors on bioaccumulation of Ni by Synechcoccus were studied in this paper. The equilibration time of Ni bioaccumulation was about 80 min in aqueous solution. Bioaccumulation quantity reached maximum when mass ratio of Ni to dry weight concentration of Synechcoccus was 16-18%. Bioaccumulation quantity increased with increasing pH. The optimum pH was 9-10 and higher pH led to precipitation of Ni（OH）2. Bioaccumulation quantity was also influenced by temperature and light intensity reaching their optima at 35℃ and 3 000 lx respectively. Bioaccumulation of nonliving algae was larger than that of living algae.
基金supported by the National Natural Science Foundation of China(Grant Nos.52102143,51772239,62001369,62075088,and 51761145024)Shaanxi Province Project(Grant Nos.2017ktpt-21 and 2018TD-024)Jiangxi Technological Innovation Guidance Science and Technology Plan(Grant No.S20212BDH80017).
文摘Electro-optic modulators,which convert electrical signals onto the transmission light,are key devices in electro-optic modulating systems.Modulation efficiency is one of the most important parameters of an electro-optic modulator,which directly determines the footprint and power consumption of the device.Generally,modulation efficiency strongly depends on the electro-optic response of the crystal.The Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIN-PMN-PT)single crystal with giant electro-optic coefficient(λ_(c))and high transparency indicates the potential to achieve greatly enhanced modulation efficiency.In this study,a prototype PIN-PMN-PT phase modulator was fabricated based on a titanium(Ti)in-diffusion waveguide,which is reported for the first time.The influences of titanium in-diffusion on the composition and domain structure of the PIN-PMN-PT single crystal were studied by transmission electron microscopy(TEM)and piezoelectric force microscopy(PFM),respectively.Finally,a half-wave voltage(V_(π))of 2.3 V was obtained using a device with 6-mm-long(L)electrodes.Furthermore,the electro-optic modulation efficiency(V_(π)L)was calculated as 1.38 V-cm,which was approximately one order of magnitude lower than that of commercial lithium niobate(LiNbO_(3),LN)phase modulators.Such enhanced modulation efficiency indicates more compact device and lower power consumption,which is of great significance for electro-optic modulation systems used in micro-fiber gyroscope,integrated photonic devices,etc.
基金the National Science Foundation of China(grant no.22077092)the Open Project Program of the State Key Laboratory of Radiation Medicine and Protection(grant no.GZK1202140)+2 种基金Science and Technology Development Plan of Suzhou(grant no.SLJ2022018)Scientific Research Project of Suzhou Commission of Health(grant no.GSWS2020028)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘RNA interfering therapy has emerged as a promising therapeutic modality to treat cancer.The specific and efficient delivery of RNA into a tumor is crucial for achieving effective cancer gene therapy but remains a huge challenge.Herein,we report a novel furin-responsive small interfering RNA(siRNA)delivery vehicle with multiple functions for colorectal tumor treatment.A peptide-based siRNA delivery vehicle RVRR-P18-Gd,consisting of furin enzyme-specific peptide substrate Arg-Val-Arg-Arg(RVRR)with positive charge for siRNA binding,a Gd(III)chelated 1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴-tetraacetic acid(DOTA)(DOTA-Gd)for magnetic resonance imaging,and purpurin 18 as photosensitizer for photodynamic therapy(PDT),was rationally designed and synthesized.Taking advantage of the cationic amphiphilic feature,RVRR-P18-Gd molecules spontaneously self-assembled with negatively charged Hif-1αsiRNA into stable nanoparticles via attractive electrostatic interaction,which effectively prevented siRNA degradation by nucleases,prolonged the circulation half-life,and enhanced tumor accumulation.Moreover,the specific release of Hif-1αsiRNA mediated by endogenous furin significantly downregulated Hif-1αexpression in colorectal cancer cells,resulting in enhanced therapeutic susceptibility,and with the PDT effect,effectively suppressed HCT116 tumor growth in living mice.This work highlights a powerful and universal approach to precisely deliver siRNA to targeted tumors for efficient synergistic therapy.
