In this work,a novel NiP_(2)/g-C_(3)N_(4)heterojunction via homogeneous precipitation method assisted by thermal phosphorization reaction was designed and constructed,and the optimized sample showed the excellent phot...In this work,a novel NiP_(2)/g-C_(3)N_(4)heterojunction via homogeneous precipitation method assisted by thermal phosphorization reaction was designed and constructed,and the optimized sample showed the excellent photocatalytic H_(2)evolution activity under visible-light irradiation,which was nearly 112 times higher than that of pristine g-C_(3)N_(4)sample.Experimental characterizations and DFT calculations demonstrated that the NiP_(2)nanoparticles covered on the g-C_(3)N_(4)surface can form a built-in electric field at the interface to accelerate the transfer of photoexcited electrons from g-C_(3)N_(4)to NiP_(2),crucial for hindering the recombination of electron-hole pairs.Moreover,the energy barrier of hydrogen evolution reaction can also vastly reduce when combined NiP_(2)and g-C_(3)N_(4)to construct NiP_(2)/g-C_(3)N_(4)heterojunction.This work represents a method through combing experimental and theoretical tools to thoroughly investigate the mechanism of photocatalytic process.展开更多
Alcaligenes faecalis C16 was found to have the ability to heterotrophically nitrify and aerobically denitrify. In order to further understand its nitrogen removal ability and mechanism, the growth and ammonium removal...Alcaligenes faecalis C16 was found to have the ability to heterotrophically nitrify and aerobically denitrify. In order to further understand its nitrogen removal ability and mechanism, the growth and ammonium removal response were investigated at different C/N ratios and ammonium concentrations in the medium with citrate and acetate as carbon source separately. Furthermore, experiments of nitrogen sources, production of nitrogen gas and enzyme assay were conducted. Results show that the bacterium converts NH+4-N and produces NH2 OH during the growing phase and nitrite accumulation is its distinct metabolic feature. A. faecalis C16 is able to tolerate not only high ammonium concentration but also high C/N ratio, and the ammonium tolerance is associated with carbon source and C/N ratio. The nitrogen balance under different conditions shows that approximately28%–45% of the initial ammonium is assimilated into the cells, 44%–60% is denitrified and several percent is converted to nitrification products. A. faecalis C16 cannot utilize hydroxylamine, nitrite or nitrate as the sole nitrogen source for growth. However, nitrate can be used when ammonium is simultaneously present in the medium. A possible pathway for nitrogen removal by C16 is suggested. The preliminary enzyme assay provides more evidence for this nitrogen removal pathway.展开更多
Purpose::To retrospectively analyze the clinical outcomes of meniscus repair with simultaneous anterior cruciate ligament(ACL)reconstruction and explore the causes of failure of meniscus repair.Methods::From May 2013 ...Purpose::To retrospectively analyze the clinical outcomes of meniscus repair with simultaneous anterior cruciate ligament(ACL)reconstruction and explore the causes of failure of meniscus repair.Methods::From May 2013 to July 2018,the clinical data of 165 patients who were treated with meniscus surgery and simultaneous ACL reconstruction,including 69 cases of meniscus repair(repair group)and 96 cases of partial meniscectomy(partial meniscectomy group)were retrospectively analyzed.The exclusion criteria were as follows:(1)ACL rupture associated with fracture,collateral ligament injury,or complex ligament injury;(2)a history of knee surgery;or(3)a significant degree of osteoarthritis.The 69 patients in the repair group were divided into the non-failure group(62 cases)and the failure group(7 cases)depending on the repair effect.Postoperative outcomes of the repair group and the partial meniscectomy group were compared.General conditions and postoperative outcomes of the failure group and the non-failure group were compared.During the median follow-up period of 28 months(range,4-65 months)after the second arthroscopy,postoperative outcomes of seven patients in the failure group were summarized.SPSS 25.0 statistical software was used for statistical analysis.A p value less than 0.05 was considered statistically significant.Results::Seven patients in the failure group who underwent the second arthroscopy were followed up for(30±17.4)months and their postoperative outcomes were summarized.Compared with the partial meniscectomy group,the International Knee Documentation Committee scores of patients in the repair group improved significantly(p=0.031).Compared with the non-failure group,more patients in the failure group were younger than 24 years(p=0.030).The median follow-up period was 39.5 months.All patients recovered well after subsequent partial meniscectomy and relieved clinical symptoms.Visual analog scale scores decreased significantly(p=0.026),and the International Knee Documentation Committee and Lysholm scores improved significantly(p=0.046 for both).Conclusion::The failure rate of meniscus repair in this study was 10.1%(7/69),all of which were medial meniscus tears.However,the surgical outcomes of ACL reconstruction were not affected,and there might be a role for graft protection.Therefore,meniscus retears can be successful treated by performing subsequent partial meniscectomy in patients with repair failure.展开更多
Single-atom catalysts(SACs)are promising in some reactions typically promoted by homogeneous catalysts.However,the leaching of active species from the support in liquid-phase reactions hinders their potential applicat...Single-atom catalysts(SACs)are promising in some reactions typically promoted by homogeneous catalysts.However,the leaching of active species from the support in liquid-phase reactions hinders their potential applications.Herein,taking the hydroformylation reaction as an example,we report ionic liquid(IL)-induced stabilization of single Rh atoms against leaching.Among the ILs examined.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U1862105,22108214,22050410267)Natural Science Basic Research Plan in Shaanxi Province of China(Grant Nos.2017JZ001,2018KJXX-008)+3 种基金Fundamental Research Funds for the Central Universities(Grant No.cxtd2017004)China Postdoctoral Science Foundation(Grant No.2021TQ0262)the Promotion Plan for Young People of Shaanxi Association for Science and Technology(20210605)K.C.Wong Education Foundation,Hong Kong,China。
文摘In this work,a novel NiP_(2)/g-C_(3)N_(4)heterojunction via homogeneous precipitation method assisted by thermal phosphorization reaction was designed and constructed,and the optimized sample showed the excellent photocatalytic H_(2)evolution activity under visible-light irradiation,which was nearly 112 times higher than that of pristine g-C_(3)N_(4)sample.Experimental characterizations and DFT calculations demonstrated that the NiP_(2)nanoparticles covered on the g-C_(3)N_(4)surface can form a built-in electric field at the interface to accelerate the transfer of photoexcited electrons from g-C_(3)N_(4)to NiP_(2),crucial for hindering the recombination of electron-hole pairs.Moreover,the energy barrier of hydrogen evolution reaction can also vastly reduce when combined NiP_(2)and g-C_(3)N_(4)to construct NiP_(2)/g-C_(3)N_(4)heterojunction.This work represents a method through combing experimental and theoretical tools to thoroughly investigate the mechanism of photocatalytic process.
基金National Natural Science Foundation of China(51078252)the Science and Technology Program of Taiyuan(120233)the Natural Science Foundation of Shanxi Province(2010011016–1)
文摘Alcaligenes faecalis C16 was found to have the ability to heterotrophically nitrify and aerobically denitrify. In order to further understand its nitrogen removal ability and mechanism, the growth and ammonium removal response were investigated at different C/N ratios and ammonium concentrations in the medium with citrate and acetate as carbon source separately. Furthermore, experiments of nitrogen sources, production of nitrogen gas and enzyme assay were conducted. Results show that the bacterium converts NH+4-N and produces NH2 OH during the growing phase and nitrite accumulation is its distinct metabolic feature. A. faecalis C16 is able to tolerate not only high ammonium concentration but also high C/N ratio, and the ammonium tolerance is associated with carbon source and C/N ratio. The nitrogen balance under different conditions shows that approximately28%–45% of the initial ammonium is assimilated into the cells, 44%–60% is denitrified and several percent is converted to nitrification products. A. faecalis C16 cannot utilize hydroxylamine, nitrite or nitrate as the sole nitrogen source for growth. However, nitrate can be used when ammonium is simultaneously present in the medium. A possible pathway for nitrogen removal by C16 is suggested. The preliminary enzyme assay provides more evidence for this nitrogen removal pathway.
基金This study was supported by Integrated application of technol-ogy and comprehensive demonstration Project of Scientific and Technological Winter Olympics of Zhangjiakou in 2020(20110004D)It was supported by Integrated application of technology and comprehensive demonstration Project of Scientific and Technological Winter Olympics of Zhangjiakou in 2021(21110006D)It was supported by 2019(2019YFF0302305)Nation Key Research and Development Program for"Science and Technology Winter Olympics"of China.It was also supported by the scientific research fund of Peking University Health Science Center,BMU2018MX030.
文摘Purpose::To retrospectively analyze the clinical outcomes of meniscus repair with simultaneous anterior cruciate ligament(ACL)reconstruction and explore the causes of failure of meniscus repair.Methods::From May 2013 to July 2018,the clinical data of 165 patients who were treated with meniscus surgery and simultaneous ACL reconstruction,including 69 cases of meniscus repair(repair group)and 96 cases of partial meniscectomy(partial meniscectomy group)were retrospectively analyzed.The exclusion criteria were as follows:(1)ACL rupture associated with fracture,collateral ligament injury,or complex ligament injury;(2)a history of knee surgery;or(3)a significant degree of osteoarthritis.The 69 patients in the repair group were divided into the non-failure group(62 cases)and the failure group(7 cases)depending on the repair effect.Postoperative outcomes of the repair group and the partial meniscectomy group were compared.General conditions and postoperative outcomes of the failure group and the non-failure group were compared.During the median follow-up period of 28 months(range,4-65 months)after the second arthroscopy,postoperative outcomes of seven patients in the failure group were summarized.SPSS 25.0 statistical software was used for statistical analysis.A p value less than 0.05 was considered statistically significant.Results::Seven patients in the failure group who underwent the second arthroscopy were followed up for(30±17.4)months and their postoperative outcomes were summarized.Compared with the partial meniscectomy group,the International Knee Documentation Committee scores of patients in the repair group improved significantly(p=0.031).Compared with the non-failure group,more patients in the failure group were younger than 24 years(p=0.030).The median follow-up period was 39.5 months.All patients recovered well after subsequent partial meniscectomy and relieved clinical symptoms.Visual analog scale scores decreased significantly(p=0.026),and the International Knee Documentation Committee and Lysholm scores improved significantly(p=0.046 for both).Conclusion::The failure rate of meniscus repair in this study was 10.1%(7/69),all of which were medial meniscus tears.However,the surgical outcomes of ACL reconstruction were not affected,and there might be a role for graft protection.Therefore,meniscus retears can be successful treated by performing subsequent partial meniscectomy in patients with repair failure.
基金from the Singapore National Research Foundation(ANR-17-CE06-001701 and WBS:R-279-000-530-281)for their finiancial support.The XAS were collected at the beamline BL01B1 at the SPring-8(Japan Synchrotron Radiation Research Institute,Hyogo,Japan)under the approval of JASRI(Proposal No.2019A1398).Q.H.thanks the NRF Fellowship(NRF-NRFF11-2019-0002)from the National Research Foundation of Singapore.M.G.and J.H.acknowledge the MEXT Project of Integrated Research Consortium on Chemical Science(IRCCS),the Photoexcitonix Project at Hokkaido University,and JSPS KAKENHI(JP20K05217).Some of the computations were performed at RCCS(Okazaki,Japan).
文摘Single-atom catalysts(SACs)are promising in some reactions typically promoted by homogeneous catalysts.However,the leaching of active species from the support in liquid-phase reactions hinders their potential applications.Herein,taking the hydroformylation reaction as an example,we report ionic liquid(IL)-induced stabilization of single Rh atoms against leaching.Among the ILs examined.
