Biofilms grown inside two sewage collecting pipes located in industrial and residential areas are studied. Bacterial biomass inside three layers of biofilms was evaluated. Biofilm cohesion under different mixing rate ...Biofilms grown inside two sewage collecting pipes located in industrial and residential areas are studied. Bacterial biomass inside three layers of biofilms was evaluated. Biofilm cohesion under different mixing rate and ionic strength was also investigated. Effects of physical and chemical parameters in the biofilms were evaluated by monitoring turbidity, chemical and biochemical oxygen demands. Extracted organic matter from biofilms was partitioned to polar, aromatic and saturated fractions using activated silica column chromatography. Results revealed that bacterial biomass growth depending on biofilm thickness and stratification. The most loaded stratum in bacteria/biomass was the sewage-biofilm interface stratum that represented 51% of the total bacteria/biomass. Stirring rate and ionic strength of mono- and bivalent salts showed a major influence in biofilm disruption. The stirring time enhanced the exchange dynamic and matter capture between biofilm fragments at the critical stirring rate 90 r/min. Sodium chloride showed the dispersing effect on biofilms in suspension, and decreased the BOD5 （biochemical oxygen demand） beyond the physiological salt concentration.展开更多
The main contribution of this paper is the design of an event-triggered formation control for leader-following consensus in second-order multi-agent systems(MASs)under communication faults.All the agents must follow t...The main contribution of this paper is the design of an event-triggered formation control for leader-following consensus in second-order multi-agent systems(MASs)under communication faults.All the agents must follow the trajectories of a virtual leader despite communication faults considered as smooth time-varying delays dependent on the distance between the agents.Linear matrix inequalities(LMIs)-based conditions are obtained to synthesize a controller gain that guarantees stability of the synchronization error.Based on the closed-loop system,an event-triggered mechanism is designed to reduce the control law update and information exchange in order to reduce energy consumption.The proposed approach is implemented in a real platform of a fleet of unmanned aerial vehicles(UAVs)under communication faults.A comparison between a state-of-the-art technique and the proposed technique has been provided,demonstrating the performance improvement brought by the proposed approach.展开更多
This work investigates the physico-chemical and mechanical properties of tannins extracted from wood for composite materials manufacturing. Sustainable knowledge (in terms of physico-chemical properties and behaviours...This work investigates the physico-chemical and mechanical properties of tannins extracted from wood for composite materials manufacturing. Sustainable knowledge (in terms of physico-chemical properties and behaviours) of the material is needed to further enhance its applications. The condensed tannins extracted from the Bark of Ficus platyphylla (BFP) and the Bark of Vitellaria paradoxa (BVP) were analyzed using Matrix Assisted Laser Desorption/Ionization Time-Of-Flight (MALDI-TOF), Mass Spectroscopy and Attenuated Total Reflectance Fourier Transform Mid-InfraRed (ATR-FT MIR) spectra in the ranges 1800 cm-1 and 600 cm-1, as well as using CP MAS 13C-NMR. It was found that, these two tannins are procyanidin/prodelphinidin and made up of catechin/epicatechin, gallocatechin/epigallocatechin units, fisetinidin, galloyl and carbohydrates residues. Furthermore, BFP and BVP tannin bonded particleboard densities lie in the range recommended by NF EN 326-1994 standard. The resins also yielded good internal bond strength results of the panels, above relevant international standard specifications minimum requirements for interior-grade panels. The Transmission Electron Microscopy with Energy Dispersive X-ray Spectroscopy Analysis (TEM/ EDXA) are showing the ultrastructure and reveal that most of the resin material appears to be in an amorphous phase mainly composed of carbon/oxygen with small amounts of K, Ca and Mg. These particles have a very irregular morphology.展开更多
Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or ...Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or to even months.In the past decade,the utilization of tMCS has witnessed a signicant increase in American and European countries.Meanwhile in Asia,the newly developed concepts and devices constituting tMCS have also made rapid progress.Nevertheless,the absence of a consensus or standardized guidelines,especially for the Asian population considering inherited polymorphism,is evident.To address this knowledge gap,eight associations/societies and experts in thiseld came up with the present consensus after repeated discussions,more specically for the Asian population.It comprehensively elucidates the commonly employed tMCS devices,criteria for patient selection,indications and contraindications,clinical management,and the optimal timing for implantation and weaning.The goal of this statement is to promote the standardized application of tMCS and make reasonable decisions in clinical practice.Full-length version of the consensus can be seen in Supplementary File,http://links.lww.com/CM9/B883.展开更多
Peripheral nerve regeneration requires stepwise and well-organized establishment of microenvironment.Since local delivery of VEGF-A in peripheral nerve repair is expected to promote angiogenesis in the microenvironmen...Peripheral nerve regeneration requires stepwise and well-organized establishment of microenvironment.Since local delivery of VEGF-A in peripheral nerve repair is expected to promote angiogenesis in the microenvironment and Schwann cells(SCs)play critical role in nerve repair,combination of VEGF and Schwann cells may lead to efficient peripheral nerve regeneration.VEGF-A overexpressing Schwann cells were established and loaded into the inner wall of hydroxyethyl cellulose/soy protein isolate/polyaniline sponge(HSPS)conduits.When HSPS is mechanically distorted,it still has high durability of strain strength,thus,can accommodate unexpected strain of nerve tissues in motion.A 10 mm nerve defect rat model was used to test the repair performance of the HSPS-SC(VEGF)conduits,meanwhile the HSPS,HSPS-SC,HSPS-VEGF conduits and autografts were worked as controls.The immunofluorescent co-staining of GFP/VEGF-A,Ki67 and MBP showed that the VEGF-A overexpressing Schwann cells could promote the proliferation,migration and differentiation of Schwann cells as the VEGF-A was secreted from the VEGF-A overexpressing Schwann cells.The nerve repair performance of the multifunctional and flexible conduits was examined though rat behavioristics,electrophysiology,nerve innervation to gastrocnemius muscle(GM),toluidine blue(TB)staining,transmission electron microscopy(TEM)and NF200/S100 double staining in the regenerated nerve.The results displayed that the effects on the repair of peripheral nerves in HSPS-SC(VEGF)group was the best among the conduits groups and closed to autografts.HSPS-SC(VEGF)group exhibited notably increased CD31+endothelial cells and activation of VEGFR2/ERK signaling pathway in the regenerated nerve tissues,which probably contributed to the improved nerve regeneration.Altogether,the comprehensive strategy including VEGF overexpressing Schwann cells-mediated and HSPS conduit-guided peripheral nerve repair provides a new avenue for nerve tissue engineering.展开更多
Background For patients with stroke with large-vessel occlusion(LVO),study of factors predicting response to intravenous thrombolysis(IVT)would allow identifying subgroups with high expected gain,and those for whom it...Background For patients with stroke with large-vessel occlusion(LVO),study of factors predicting response to intravenous thrombolysis(IVT)would allow identifying subgroups with high expected gain,and those for whom it could be considered as futile,and even detrimental.From patients included in the Mechanical Thrombectomy After Intravenous Alteplase vs Alteplase Alone After Stroke trial,we investigated clinical-imaging factors associated with optimal response to IVT.Methods We included patients receiving IVT alone.Excellent outcome was defined by a 3-month modified Rankin Scale(mRS)score≤1.Clinical-imaging predictors were assessed on multivariate analysis after multiple imputations.The predictive performance of the model was assessed with the C-statistic.Results Among 247 patients with LVO treated with IVT alone,77(31%)showed 3-month mRS≤1.Predictors of 3-month mRS≤1 were no medical history of hypertension(OR 2.43;95%CI 1.74 to 3.38;p=0.007);no current smoking(OR 2.76;95%CI 1.79 to 4.26;p=0.02);onset-to IVT time(OR 0.47 per hour increase;95%CI 0.23 to 0.78;p=0.003);diffusion-weighted imaging(DWI)volume(OR 0.78 per 10 mL increase;95%CI 0.68 to 0.89;p=0.0004);presence of susceptibility vessel sign(SVS)(OR 7.89;95%CI 1.65 to 37.78;p=0.01)and SVS length(OR 0.87 per mm increase;95%CI 0.80 to 0.94;p=0.001).The prediction models showed a C-statistic=0.79(95%CI 0.79 to 0.80).Conclusions In patients with stroke with anterior-circulation LVO treated with IVT alone,predictors of excellent outcome at 3 months were no medical history of hypertension or current smoking,reduced onset-to IVT time,small DWI volume,presence of SVS and short SVS length.These predictive factors could help practitioners in decision-making for IVT implementation in reperfusion strategies,all the more for the drip and ship paradigm.Trial registration number NCT01062698.展开更多
Acute scrotal pain(AsP)requiring surgical exploration is common in the pediatric population,but little has been reported on this subject with regard to the adult population.The aim of this study was to investigate the...Acute scrotal pain(AsP)requiring surgical exploration is common in the pediatric population,but little has been reported on this subject with regard to the adult population.The aim of this study was to investigate the demographic and clinical characteristics and outcomes of scrotal explorations performed on adult patients.Patients over 21 years of age who underwent surgical exploration for ASP with suspected testicular torsion(TT)at 14 French hospitals between January 2005 and December 2019 were included in this study.The main outcome measures were demographic characteristics,pathology found during scrotal exploration,and perioperative outcomes.Logistic regression was used to perform univariate and multivariate analyses to identify predictors of TT.Data for 1329 men were analyzed.The median age was 30(interquartile range[IQR]:25-35;range:21-89)years.Regarding the clinical examination,867(65.2%)patients presented with an elevation of the testicle,613(46.1%)patients with scrotal edema or erythema,and 211(15.9%)patients with nausea or vomiting.Operative findings identified TT in only 684(51.5%)patients,epididymo-orchitis in 112(8.4%)patients,a tumor in 16(1.2%)patients,and no causes in 475(35.7%)patients.Orchiectomy for nonviable testes was required in 101(7.6%)patients.In multivariate analysis,an elevation of the testicle,erythema/swelling,and the presence of nausea/vomiting were found to be associated with the occurrence of TT.Testicular torsion is not exclusive to children and adolescents,so must be considered in males of any age with acute scrotal findings.However,one-third of scrotal explorations in adults did not lead to a diagnosis.展开更多
Holo glutaredoxin(Grx)is a homo-dimer that bridges a[2Fe-2S]cluster with two glutathione(GSH)ligands.In this study,both monothiol and dithiol holo Grxs are found capable of transferring their iron-sulfur(FeS)cluster t...Holo glutaredoxin(Grx)is a homo-dimer that bridges a[2Fe-2S]cluster with two glutathione(GSH)ligands.In this study,both monothiol and dithiol holo Grxs are found capable of transferring their iron-sulfur(FeS)cluster to an apo ferredoxin(Fdx)through direct interaction,regardless of FeS cluster stability in holo Grxs.The ligand GSH molecules in holo Grxs are unstable and can be exchanged with free GSH,which inhibits the FeS cluster transfer from holo Grxs to apo Fdx.This phenomenon suggests a novel role of GSH in FeS cluster trafficking.展开更多
基金supported by the CEDRE (Cooperation for Evaluation and Developpement of Research) Program (No. 06EF29/L43).
文摘Biofilms grown inside two sewage collecting pipes located in industrial and residential areas are studied. Bacterial biomass inside three layers of biofilms was evaluated. Biofilm cohesion under different mixing rate and ionic strength was also investigated. Effects of physical and chemical parameters in the biofilms were evaluated by monitoring turbidity, chemical and biochemical oxygen demands. Extracted organic matter from biofilms was partitioned to polar, aromatic and saturated fractions using activated silica column chromatography. Results revealed that bacterial biomass growth depending on biofilm thickness and stratification. The most loaded stratum in bacteria/biomass was the sewage-biofilm interface stratum that represented 51% of the total bacteria/biomass. Stirring rate and ionic strength of mono- and bivalent salts showed a major influence in biofilm disruption. The stirring time enhanced the exchange dynamic and matter capture between biofilm fragments at the critical stirring rate 90 r/min. Sodium chloride showed the dispersing effect on biofilms in suspension, and decreased the BOD5 （biochemical oxygen demand） beyond the physiological salt concentration.
文摘The main contribution of this paper is the design of an event-triggered formation control for leader-following consensus in second-order multi-agent systems(MASs)under communication faults.All the agents must follow the trajectories of a virtual leader despite communication faults considered as smooth time-varying delays dependent on the distance between the agents.Linear matrix inequalities(LMIs)-based conditions are obtained to synthesize a controller gain that guarantees stability of the synchronization error.Based on the closed-loop system,an event-triggered mechanism is designed to reduce the control law update and information exchange in order to reduce energy consumption.The proposed approach is implemented in a real platform of a fleet of unmanned aerial vehicles(UAVs)under communication faults.A comparison between a state-of-the-art technique and the proposed technique has been provided,demonstrating the performance improvement brought by the proposed approach.
文摘This work investigates the physico-chemical and mechanical properties of tannins extracted from wood for composite materials manufacturing. Sustainable knowledge (in terms of physico-chemical properties and behaviours) of the material is needed to further enhance its applications. The condensed tannins extracted from the Bark of Ficus platyphylla (BFP) and the Bark of Vitellaria paradoxa (BVP) were analyzed using Matrix Assisted Laser Desorption/Ionization Time-Of-Flight (MALDI-TOF), Mass Spectroscopy and Attenuated Total Reflectance Fourier Transform Mid-InfraRed (ATR-FT MIR) spectra in the ranges 1800 cm-1 and 600 cm-1, as well as using CP MAS 13C-NMR. It was found that, these two tannins are procyanidin/prodelphinidin and made up of catechin/epicatechin, gallocatechin/epigallocatechin units, fisetinidin, galloyl and carbohydrates residues. Furthermore, BFP and BVP tannin bonded particleboard densities lie in the range recommended by NF EN 326-1994 standard. The resins also yielded good internal bond strength results of the panels, above relevant international standard specifications minimum requirements for interior-grade panels. The Transmission Electron Microscopy with Energy Dispersive X-ray Spectroscopy Analysis (TEM/ EDXA) are showing the ultrastructure and reveal that most of the resin material appears to be in an amorphous phase mainly composed of carbon/oxygen with small amounts of K, Ca and Mg. These particles have a very irregular morphology.
基金National Natural Science Foundation of China(Nos.81974034,81970396,81670351,and 82001701)National Key Research and Development Program(No.2021YFA 1101900)
文摘Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or to even months.In the past decade,the utilization of tMCS has witnessed a signicant increase in American and European countries.Meanwhile in Asia,the newly developed concepts and devices constituting tMCS have also made rapid progress.Nevertheless,the absence of a consensus or standardized guidelines,especially for the Asian population considering inherited polymorphism,is evident.To address this knowledge gap,eight associations/societies and experts in thiseld came up with the present consensus after repeated discussions,more specically for the Asian population.It comprehensively elucidates the commonly employed tMCS devices,criteria for patient selection,indications and contraindications,clinical management,and the optimal timing for implantation and weaning.The goal of this statement is to promote the standardized application of tMCS and make reasonable decisions in clinical practice.Full-length version of the consensus can be seen in Supplementary File,http://links.lww.com/CM9/B883.
基金This work was supported by the National Natural Science Foundation of China(Grant No.:NSFC 81871493,81871503)the Medical Science Advancement Program(Clinical Medicine)of Wuhan University(Grant No.:TFLC2018002,2018003)。
文摘Peripheral nerve regeneration requires stepwise and well-organized establishment of microenvironment.Since local delivery of VEGF-A in peripheral nerve repair is expected to promote angiogenesis in the microenvironment and Schwann cells(SCs)play critical role in nerve repair,combination of VEGF and Schwann cells may lead to efficient peripheral nerve regeneration.VEGF-A overexpressing Schwann cells were established and loaded into the inner wall of hydroxyethyl cellulose/soy protein isolate/polyaniline sponge(HSPS)conduits.When HSPS is mechanically distorted,it still has high durability of strain strength,thus,can accommodate unexpected strain of nerve tissues in motion.A 10 mm nerve defect rat model was used to test the repair performance of the HSPS-SC(VEGF)conduits,meanwhile the HSPS,HSPS-SC,HSPS-VEGF conduits and autografts were worked as controls.The immunofluorescent co-staining of GFP/VEGF-A,Ki67 and MBP showed that the VEGF-A overexpressing Schwann cells could promote the proliferation,migration and differentiation of Schwann cells as the VEGF-A was secreted from the VEGF-A overexpressing Schwann cells.The nerve repair performance of the multifunctional and flexible conduits was examined though rat behavioristics,electrophysiology,nerve innervation to gastrocnemius muscle(GM),toluidine blue(TB)staining,transmission electron microscopy(TEM)and NF200/S100 double staining in the regenerated nerve.The results displayed that the effects on the repair of peripheral nerves in HSPS-SC(VEGF)group was the best among the conduits groups and closed to autografts.HSPS-SC(VEGF)group exhibited notably increased CD31+endothelial cells and activation of VEGFR2/ERK signaling pathway in the regenerated nerve tissues,which probably contributed to the improved nerve regeneration.Altogether,the comprehensive strategy including VEGF overexpressing Schwann cells-mediated and HSPS conduit-guided peripheral nerve repair provides a new avenue for nerve tissue engineering.
文摘Background For patients with stroke with large-vessel occlusion(LVO),study of factors predicting response to intravenous thrombolysis(IVT)would allow identifying subgroups with high expected gain,and those for whom it could be considered as futile,and even detrimental.From patients included in the Mechanical Thrombectomy After Intravenous Alteplase vs Alteplase Alone After Stroke trial,we investigated clinical-imaging factors associated with optimal response to IVT.Methods We included patients receiving IVT alone.Excellent outcome was defined by a 3-month modified Rankin Scale(mRS)score≤1.Clinical-imaging predictors were assessed on multivariate analysis after multiple imputations.The predictive performance of the model was assessed with the C-statistic.Results Among 247 patients with LVO treated with IVT alone,77(31%)showed 3-month mRS≤1.Predictors of 3-month mRS≤1 were no medical history of hypertension(OR 2.43;95%CI 1.74 to 3.38;p=0.007);no current smoking(OR 2.76;95%CI 1.79 to 4.26;p=0.02);onset-to IVT time(OR 0.47 per hour increase;95%CI 0.23 to 0.78;p=0.003);diffusion-weighted imaging(DWI)volume(OR 0.78 per 10 mL increase;95%CI 0.68 to 0.89;p=0.0004);presence of susceptibility vessel sign(SVS)(OR 7.89;95%CI 1.65 to 37.78;p=0.01)and SVS length(OR 0.87 per mm increase;95%CI 0.80 to 0.94;p=0.001).The prediction models showed a C-statistic=0.79(95%CI 0.79 to 0.80).Conclusions In patients with stroke with anterior-circulation LVO treated with IVT alone,predictors of excellent outcome at 3 months were no medical history of hypertension or current smoking,reduced onset-to IVT time,small DWI volume,presence of SVS and short SVS length.These predictive factors could help practitioners in decision-making for IVT implementation in reperfusion strategies,all the more for the drip and ship paradigm.Trial registration number NCT01062698.
文摘Acute scrotal pain(AsP)requiring surgical exploration is common in the pediatric population,but little has been reported on this subject with regard to the adult population.The aim of this study was to investigate the demographic and clinical characteristics and outcomes of scrotal explorations performed on adult patients.Patients over 21 years of age who underwent surgical exploration for ASP with suspected testicular torsion(TT)at 14 French hospitals between January 2005 and December 2019 were included in this study.The main outcome measures were demographic characteristics,pathology found during scrotal exploration,and perioperative outcomes.Logistic regression was used to perform univariate and multivariate analyses to identify predictors of TT.Data for 1329 men were analyzed.The median age was 30(interquartile range[IQR]:25-35;range:21-89)years.Regarding the clinical examination,867(65.2%)patients presented with an elevation of the testicle,613(46.1%)patients with scrotal edema or erythema,and 211(15.9%)patients with nausea or vomiting.Operative findings identified TT in only 684(51.5%)patients,epididymo-orchitis in 112(8.4%)patients,a tumor in 16(1.2%)patients,and no causes in 475(35.7%)patients.Orchiectomy for nonviable testes was required in 101(7.6%)patients.In multivariate analysis,an elevation of the testicle,erythema/swelling,and the presence of nausea/vomiting were found to be associated with the occurrence of TT.Testicular torsion is not exclusive to children and adolescents,so must be considered in males of any age with acute scrotal findings.However,one-third of scrotal explorations in adults did not lead to a diagnosis.
基金supported by grants from Minis-try of Science and Technology of China(Nos.2012CB910703 and 2006DFA31210)National Natural Science Foundation of China(Grant No.30570353)to BXthe ANR Grant(No.2010BLAN1616)to NR and JPJ.
文摘Holo glutaredoxin(Grx)is a homo-dimer that bridges a[2Fe-2S]cluster with two glutathione(GSH)ligands.In this study,both monothiol and dithiol holo Grxs are found capable of transferring their iron-sulfur(FeS)cluster to an apo ferredoxin(Fdx)through direct interaction,regardless of FeS cluster stability in holo Grxs.The ligand GSH molecules in holo Grxs are unstable and can be exchanged with free GSH,which inhibits the FeS cluster transfer from holo Grxs to apo Fdx.This phenomenon suggests a novel role of GSH in FeS cluster trafficking.
