Objective:Total knee arthroplasty(TKA)has become an effective treatment modality for end-stage osteoarthritis and rheumatoid arthritis.Postoperative problems such as anterior knee pain affect postoperative patient sat...Objective:Total knee arthroplasty(TKA)has become an effective treatment modality for end-stage osteoarthritis and rheumatoid arthritis.Postoperative problems such as anterior knee pain affect postoperative patient satisfaction.Patellar denervation has been proposed as a technique to relieve pain,but its efficacy remains controversial.This study evaluated the mid-and long-term effects of patellar denervation on postoperative knee joint functions,hoping to provide better guidance for clinical practice.Methods:This study is a prospective randomized controlled double-blind study.58 patients undergoing bilateral non-resurfaced total knee arthroplasty were included and randomized into two groups.Both groups underwent total knee arthroplasty while patellar denervation was performed only on the experimental group.Information regarding whether if patellar denervation was performed were withheld from all patients and outcome assessors.All surgeries were performed by the same high-level professional physician,and the post-stable knee prosthesis system(PS Scorpio NRG PS,Stryker)was used during the surgeries.The knee joint functions were evaluated by professional assessors before and after surgery.The evaluation indicators mainly include KSS scoring,Western Ontario and McMaster Universities(WOMAC)scoring and Visual Analogue Scale(VAS),FJS scoring,etc.The follow-up period was 3 years and 5 years after surgery.Results:The experimental group had better KSS and FJS scores than the control group,the difference was statistically significant.There was no significant inter-group difference in WOMAC and VAS scores.Conclusion:The patellar denervation in TKA patients has positive effects on the mid-and long-term recovery of knee joint functions,and the postoperative satisfaction is better.展开更多
Src SH3 protein domain is a typical two-state protein which has been confirmed by research of denaturant-induced unfolding dynamics.Force spectroscopy experiments by optical tweezers and atomic force microscopy have m...Src SH3 protein domain is a typical two-state protein which has been confirmed by research of denaturant-induced unfolding dynamics.Force spectroscopy experiments by optical tweezers and atomic force microscopy have measured the force-dependent unfolding rates with different kinds of pulling geometry.However,the equilibrium folding and unfolding dynamics at constant forces has not been reported.Here,using stable magnetic tweezers,we performed equilibrium folding and unfolding dynamic measurement and force-jump measurement of src SH3 domain with tethering points at its N-and C-termini.From the obtained force-dependent transition rates,a detailed two-state free energy landscape of src SH3 protein is constructed with quantitative information of folding free energy,transition state barrier height and position,which exemplifies the capability of magnetic tweezers to study protein folding and unfolding dynamics.展开更多
Bauxite is one of the main raw materials in the alumina industry.Fine high-sulfur bauxite flotation desulfurization is a great challenge presently.This study aims to synthesize nanoparticle collectors(NPCs)by emulsion...Bauxite is one of the main raw materials in the alumina industry.Fine high-sulfur bauxite flotation desulfurization is a great challenge presently.This study aims to synthesize nanoparticle collectors(NPCs)by emulsion polymerization to improve the abovesaid flotation desulfurization process.The physicochemical properties of high-sulfur bauxite were analyzed,and the experimental conditions for the synthesis of NPCs were optimized.The interaction mechanism between NPCs and pyrite was studied via fundamental analyses including SEM(Scanning Electron Microscope),FT-IR(Fourier Transform Infrared spectoscopy),Zeta-potential,XPS(X-ray Photoelectron Spectroscopy),and wettability.Under the closed-circuit flotation flowsheet of"one roughing-two cleaning-three scavenging",aluminum concen-trate with a yield of 85.91%and sulfur content of 0.56%were obtained using a common collector.However,with the addition of the novel NPC,aluminum concentrate with a yield of 85.70%and sulfur content of 0.36%could be obtained by a simpler flowsheet of"one roughing-one cleaning-two scav-enging".The improvement in flotation performance is suggested to be contributed by the addition of spherical NPC,which induced a rougher and more hydrophobic pyrite surface.展开更多
Large area and uniform monolayer MoS_(2)is of great importance for optoelectronic devices but is commonly suffering from rather weak photoluminescence.Here,by engineering the concentration profiles of gaseous chemical...Large area and uniform monolayer MoS_(2)is of great importance for optoelectronic devices but is commonly suffering from rather weak photoluminescence.Here,by engineering the concentration profiles of gaseous chemicals through extra trace amounts of water,we demonstrate the uniform dendrite-type growth of monolayer MoS_(2)unraveled by spatially resolved fluorescence spectroscopy,which exhibits macroscopic monolayer flakes [up to centimeter scale] with photoluminescence intensity of orders of magnitude higher than conventional chemical vapor deposition monolayer MoS_(2).Both spectroscopic evidence and theoretical models reveal that the fast-fractal dendrite growth can be ascribed to the extra introduced water sources that generate sufficient aqueous gas around the S-poor regions nearby the central-axis zone,leading to highly efficient Mo sources transport,accelerated S atom corrosion nearby grain edges,and/or defect sites,as well as enhanced photoemission intensity.Our results may provide new insight for high throughput fabrication of MoS_(2)monolayers with high yield photoluminescence efficiency.展开更多
文摘Objective:Total knee arthroplasty(TKA)has become an effective treatment modality for end-stage osteoarthritis and rheumatoid arthritis.Postoperative problems such as anterior knee pain affect postoperative patient satisfaction.Patellar denervation has been proposed as a technique to relieve pain,but its efficacy remains controversial.This study evaluated the mid-and long-term effects of patellar denervation on postoperative knee joint functions,hoping to provide better guidance for clinical practice.Methods:This study is a prospective randomized controlled double-blind study.58 patients undergoing bilateral non-resurfaced total knee arthroplasty were included and randomized into two groups.Both groups underwent total knee arthroplasty while patellar denervation was performed only on the experimental group.Information regarding whether if patellar denervation was performed were withheld from all patients and outcome assessors.All surgeries were performed by the same high-level professional physician,and the post-stable knee prosthesis system(PS Scorpio NRG PS,Stryker)was used during the surgeries.The knee joint functions were evaluated by professional assessors before and after surgery.The evaluation indicators mainly include KSS scoring,Western Ontario and McMaster Universities(WOMAC)scoring and Visual Analogue Scale(VAS),FJS scoring,etc.The follow-up period was 3 years and 5 years after surgery.Results:The experimental group had better KSS and FJS scores than the control group,the difference was statistically significant.There was no significant inter-group difference in WOMAC and VAS scores.Conclusion:The patellar denervation in TKA patients has positive effects on the mid-and long-term recovery of knee joint functions,and the postoperative satisfaction is better.
基金the National Natural Science Foundation of China(Grant Nos.11874309 and 11474237)the 111 Project(Grant No.B16029)。
文摘Src SH3 protein domain is a typical two-state protein which has been confirmed by research of denaturant-induced unfolding dynamics.Force spectroscopy experiments by optical tweezers and atomic force microscopy have measured the force-dependent unfolding rates with different kinds of pulling geometry.However,the equilibrium folding and unfolding dynamics at constant forces has not been reported.Here,using stable magnetic tweezers,we performed equilibrium folding and unfolding dynamic measurement and force-jump measurement of src SH3 domain with tethering points at its N-and C-termini.From the obtained force-dependent transition rates,a detailed two-state free energy landscape of src SH3 protein is constructed with quantitative information of folding free energy,transition state barrier height and position,which exemplifies the capability of magnetic tweezers to study protein folding and unfolding dynamics.
基金supported by the Foundation for University Key Teacher by Henan Province(grant No.2020GGJS051)Henan Polytechnic University Science Fund for Distinguished Young Scholars(grant No.J2021-1)Foundation for University Key Teacher by Henan Polytechnic University(grant No.2017XQG-12).
文摘Bauxite is one of the main raw materials in the alumina industry.Fine high-sulfur bauxite flotation desulfurization is a great challenge presently.This study aims to synthesize nanoparticle collectors(NPCs)by emulsion polymerization to improve the abovesaid flotation desulfurization process.The physicochemical properties of high-sulfur bauxite were analyzed,and the experimental conditions for the synthesis of NPCs were optimized.The interaction mechanism between NPCs and pyrite was studied via fundamental analyses including SEM(Scanning Electron Microscope),FT-IR(Fourier Transform Infrared spectoscopy),Zeta-potential,XPS(X-ray Photoelectron Spectroscopy),and wettability.Under the closed-circuit flotation flowsheet of"one roughing-two cleaning-three scavenging",aluminum concen-trate with a yield of 85.91%and sulfur content of 0.56%were obtained using a common collector.However,with the addition of the novel NPC,aluminum concentrate with a yield of 85.70%and sulfur content of 0.36%could be obtained by a simpler flowsheet of"one roughing-one cleaning-two scav-enging".The improvement in flotation performance is suggested to be contributed by the addition of spherical NPC,which induced a rougher and more hydrophobic pyrite surface.
基金supported by the National Natural Science Foundation of China (Nos. 12022403, 61735008, and 11874211)the National Key Research and Development Program of China (No. 2021YFA140070)
文摘Large area and uniform monolayer MoS_(2)is of great importance for optoelectronic devices but is commonly suffering from rather weak photoluminescence.Here,by engineering the concentration profiles of gaseous chemicals through extra trace amounts of water,we demonstrate the uniform dendrite-type growth of monolayer MoS_(2)unraveled by spatially resolved fluorescence spectroscopy,which exhibits macroscopic monolayer flakes [up to centimeter scale] with photoluminescence intensity of orders of magnitude higher than conventional chemical vapor deposition monolayer MoS_(2).Both spectroscopic evidence and theoretical models reveal that the fast-fractal dendrite growth can be ascribed to the extra introduced water sources that generate sufficient aqueous gas around the S-poor regions nearby the central-axis zone,leading to highly efficient Mo sources transport,accelerated S atom corrosion nearby grain edges,and/or defect sites,as well as enhanced photoemission intensity.Our results may provide new insight for high throughput fabrication of MoS_(2)monolayers with high yield photoluminescence efficiency.