AIM: To investigate the impact of non-Descemet stripping endothelial keratoplasty(non-DSEK) on graft rejection rate,and its overall procedural effectiveness in patients.METHODS: Non-DSEK was performed on 65 eyes of 64...AIM: To investigate the impact of non-Descemet stripping endothelial keratoplasty(non-DSEK) on graft rejection rate,and its overall procedural effectiveness in patients.METHODS: Non-DSEK was performed on 65 eyes of 64 patients,and the procedural outcomes,including rejection episodes,failure and dislocation of the grafts,best corrected visual acuity(BCVA),endothelial cell density(ECD),and other complications,were analyzed retrospectively.RESULTS: Of the 65 eyes,63 recovered from bullous keratopathy with a clear cornea.The mean follow-up time was 26.4mo(range,6-84mo).The mean BCVA improved from 1.70 log MAR preoperatively to 0.54 log MAR at 3mo,0.46 logM AR at 6mo,and 0.37 logM AR at 1y after surgery.The postoperative donor ECD of the 25 patients who successfully underwent specular microscopic examination was 1918±534 cells/mm^2(range,637 to 3056 cells/mm^2),and the mean endothelial cell loss was 41.9% at 24 mo postoperatively.One eye developed secondary glaucoma and required regrafting via penetrating keratoplasty(PKP).Another eye had postoperative graft failure due to rejection at 26 mo.Postoperative graft dislocation occurred in eight eyes.All of the eight dislocated grafts were reattached using air reinjection.CONCLUSION: Immunological graft rejection of the donor graft rarely occurs in non-DSEK.Therefore,non-DSEK is a safe,concise,and effective alternative to restore corneal decompensation when the Descemet membrane is disease-free.展开更多
Pt:Pd:Co ternary alloy nanoparticles were synthesized by sodium borohydride reduction under nitrogen,and were supported on carbon black as catalysts for methanol and formic acid electro-oxidation.Compared with Pt_(0.6...Pt:Pd:Co ternary alloy nanoparticles were synthesized by sodium borohydride reduction under nitrogen,and were supported on carbon black as catalysts for methanol and formic acid electro-oxidation.Compared with Pt_(0.65_Co_(0.35)/C,Pt/C,Pd_(0.65)Co_(0.35)/C and Pd/C catalyst,Pt_(0.35)Pd_(0.35)Co_(0.30)/C exhibited relatively high durability and strong poisoning resistance,and the Pt-mass activity was 3.6 times higher than that of Pt/C in methanol oxidation reaction.Meanwhile,the Pt_(0.35)Pd_(0.35)Co_(0.30)/C exhibited excellent activity with higher current density and higher CO tolerance than that of Pt_(0.65)Co_(0.35)/C,Pt/C,Pd_(0.65)CO_(0.35)/C,and Pd/C in formic acid electro-oxidation.展开更多
A two-stage transition upon crossing the glass transition of polystyrene with increasing temperature was precisely determined and interpreted by using solid-state nuclear magnetic resonance(SSNMR), ~1H-~1H dipolar cou...A two-stage transition upon crossing the glass transition of polystyrene with increasing temperature was precisely determined and interpreted by using solid-state nuclear magnetic resonance(SSNMR), ~1H-~1H dipolar couplings based double quantum-filtered(DQF) and dipolar filter(DF) experiments and ^(13)C chemical shift anisotropy(CSA) based centerband-only detection of exchange(CODEX) experiment are used to fully characterize the time scale of molecular motions during the glass transition. While differential scanning calorimetry(DSC) and CODEX experiment predicted the first stage of glass transiton, DQF and DF experiments provided the evidence for the second stage transition during which the time scale of molecular motions changed from very slow(t > ms) to very fast(t < μs). The first stage of glass transition begins with the occurrence of remarkable slow re-orientation motions of the polymer backbone segments and ends when the degree of slow motion reaches maximum. The onset and endpoint of the conventional calorimetric glass transition of polystyrene can be quantitatively determined at the molecular level by SSNMR. In the second stage, a subsequent dramatic transition associated with the melting of the glassy components was observed. In this stage liquid-like NMR signals appeared and rapidly increased in intensity after a characteristic temperature T_f(~1.1T_g). The signals associated with the glassy components completely disappeared at another characteristic temperature T_c(~1.2T_g).展开更多
Hierarchically mesoporous titanosilicate Ti-SBA-1 was synthesized with organic mesomorphous complexes of polyelectrolyte(poly(acrylic acid)(PAA)) and cationic surfactant(hexadecyl pyridinium chloride(CPC)) as template...Hierarchically mesoporous titanosilicate Ti-SBA-1 was synthesized with organic mesomorphous complexes of polyelectrolyte(poly(acrylic acid)(PAA)) and cationic surfactant(hexadecyl pyridinium chloride(CPC)) as template, tetraethylsiloxane as silica source and titanium ethoxide as titanium source.By adjusting the amount of titanium ethoxide in the synthesis, a series of Ti-SBA-1 particles with different Si/Ti ratio(79–180) were prepared. After incorporation of Ti into the silica framework the wellordered cubic Pm3n mesostructure remained, as well as the morphology, particle size. UV–vis DR spectra of the Ti-SBA-1 materials indicated that incorporated titanium species existed in a highly dispersed state and exhibited tetrahedral and octahedral coordination in the silica framework.展开更多
Mesoporous single crystal-like Y_2O_3 nanocubes have been prepared through a coordination-based selfassembly process.Firstly,a uniform nanocube-Iike Y-lysine precursor was simply prepared with hydrothermal treatment.A...Mesoporous single crystal-like Y_2O_3 nanocubes have been prepared through a coordination-based selfassembly process.Firstly,a uniform nanocube-Iike Y-lysine precursor was simply prepared with hydrothermal treatment.After the simple thermal treatment process,nanocube-shaped yttrium oxides with the morphology inherited from the Y-lysine precursor were successfully prepared.The phase,morphology,size and crystalline structure were well characterized by XRD,SEM and TEM.N_2adsorption-desorption demonstrates the mesoporous characteristics of the Y_2O_3 nanocubes,showing a relatively high surface area of 60 m^2/g.展开更多
PtSn_2-SnO_2/C nanocatalyst was prepared by co-reduction of Pt and Sn precursor at ca,15℃.The formation of PtSn_2-SnO_2 nanoparticle was determined by XRD,TEM and XPS characterization.This PtSn_2-SnO_2/C nanocatalyst...PtSn_2-SnO_2/C nanocatalyst was prepared by co-reduction of Pt and Sn precursor at ca,15℃.The formation of PtSn_2-SnO_2 nanoparticle was determined by XRD,TEM and XPS characterization.This PtSn_2-SnO_2/C nanocatalyst exhibits stronger resistance to CO poisoning and effectively improves methanol electro-catalytic effect,up to 3 times than the commercial Pt/C catalyst.展开更多
基金Supported by Science Research Foundation of Aier Eye Hospital Group(No.AFl44D11)
文摘AIM: To investigate the impact of non-Descemet stripping endothelial keratoplasty(non-DSEK) on graft rejection rate,and its overall procedural effectiveness in patients.METHODS: Non-DSEK was performed on 65 eyes of 64 patients,and the procedural outcomes,including rejection episodes,failure and dislocation of the grafts,best corrected visual acuity(BCVA),endothelial cell density(ECD),and other complications,were analyzed retrospectively.RESULTS: Of the 65 eyes,63 recovered from bullous keratopathy with a clear cornea.The mean follow-up time was 26.4mo(range,6-84mo).The mean BCVA improved from 1.70 log MAR preoperatively to 0.54 log MAR at 3mo,0.46 logM AR at 6mo,and 0.37 logM AR at 1y after surgery.The postoperative donor ECD of the 25 patients who successfully underwent specular microscopic examination was 1918±534 cells/mm^2(range,637 to 3056 cells/mm^2),and the mean endothelial cell loss was 41.9% at 24 mo postoperatively.One eye developed secondary glaucoma and required regrafting via penetrating keratoplasty(PKP).Another eye had postoperative graft failure due to rejection at 26 mo.Postoperative graft dislocation occurred in eight eyes.All of the eight dislocated grafts were reattached using air reinjection.CONCLUSION: Immunological graft rejection of the donor graft rarely occurs in non-DSEK.Therefore,non-DSEK is a safe,concise,and effective alternative to restore corneal decompensation when the Descemet membrane is disease-free.
基金supported by NSFC(No.21373116)Tianjin Natural Science Research Fund(No.13JCYBJC18300)+1 种基金RFDP(No. 20120031110005)MOE Innovation Team of China(No. IRT13022)
文摘Pt:Pd:Co ternary alloy nanoparticles were synthesized by sodium borohydride reduction under nitrogen,and were supported on carbon black as catalysts for methanol and formic acid electro-oxidation.Compared with Pt_(0.65_Co_(0.35)/C,Pt/C,Pd_(0.65)Co_(0.35)/C and Pd/C catalyst,Pt_(0.35)Pd_(0.35)Co_(0.30)/C exhibited relatively high durability and strong poisoning resistance,and the Pt-mass activity was 3.6 times higher than that of Pt/C in methanol oxidation reaction.Meanwhile,the Pt_(0.35)Pd_(0.35)Co_(0.30)/C exhibited excellent activity with higher current density and higher CO tolerance than that of Pt_(0.65)Co_(0.35)/C,Pt/C,Pd_(0.65)CO_(0.35)/C,and Pd/C in formic acid electro-oxidation.
基金financially supported by the National Science Fund for Distinguished Young Scholars(No.20825416)the National Natural Science Foundation of China(No.21374051)+2 种基金973 program(No.2012CB821503)PCSIRT(No.IRT1257)CERS-1-61.A.C.S.acknowledges the support of the Natural Science and Engineering Council(NSERC)of Canada
文摘A two-stage transition upon crossing the glass transition of polystyrene with increasing temperature was precisely determined and interpreted by using solid-state nuclear magnetic resonance(SSNMR), ~1H-~1H dipolar couplings based double quantum-filtered(DQF) and dipolar filter(DF) experiments and ^(13)C chemical shift anisotropy(CSA) based centerband-only detection of exchange(CODEX) experiment are used to fully characterize the time scale of molecular motions during the glass transition. While differential scanning calorimetry(DSC) and CODEX experiment predicted the first stage of glass transiton, DQF and DF experiments provided the evidence for the second stage transition during which the time scale of molecular motions changed from very slow(t > ms) to very fast(t < μs). The first stage of glass transition begins with the occurrence of remarkable slow re-orientation motions of the polymer backbone segments and ends when the degree of slow motion reaches maximum. The onset and endpoint of the conventional calorimetric glass transition of polystyrene can be quantitatively determined at the molecular level by SSNMR. In the second stage, a subsequent dramatic transition associated with the melting of the glassy components was observed. In this stage liquid-like NMR signals appeared and rapidly increased in intensity after a characteristic temperature T_f(~1.1T_g). The signals associated with the glassy components completely disappeared at another characteristic temperature T_c(~1.2T_g).
基金supported by National Science Foundation of China (Nos. 21373116 and 21421001)Tianjin Natural Science Research Fund (No. 13JCYBJC18300)+3 种基金RFDP (No. 20120031110005)the Technology Planning Project of Hunan Province (No. 2014SK2019)National Science Foundation for Post-doctoral Scientists of China (No. 2014T70774)the Scientific Research Fund of Hunan Provincial Education Department (No. 14C0343)
文摘Hierarchically mesoporous titanosilicate Ti-SBA-1 was synthesized with organic mesomorphous complexes of polyelectrolyte(poly(acrylic acid)(PAA)) and cationic surfactant(hexadecyl pyridinium chloride(CPC)) as template, tetraethylsiloxane as silica source and titanium ethoxide as titanium source.By adjusting the amount of titanium ethoxide in the synthesis, a series of Ti-SBA-1 particles with different Si/Ti ratio(79–180) were prepared. After incorporation of Ti into the silica framework the wellordered cubic Pm3n mesostructure remained, as well as the morphology, particle size. UV–vis DR spectra of the Ti-SBA-1 materials indicated that incorporated titanium species existed in a highly dispersed state and exhibited tetrahedral and octahedral coordination in the silica framework.
基金supported by NSFC(No.21373116)Tianjin Natural Science Research Fund(No.13JCYBJC18300)+1 种基金RFDP(No. 20120031110005)MOE Innovation Team(No.IRT13022) of China
文摘Mesoporous single crystal-like Y_2O_3 nanocubes have been prepared through a coordination-based selfassembly process.Firstly,a uniform nanocube-Iike Y-lysine precursor was simply prepared with hydrothermal treatment.After the simple thermal treatment process,nanocube-shaped yttrium oxides with the morphology inherited from the Y-lysine precursor were successfully prepared.The phase,morphology,size and crystalline structure were well characterized by XRD,SEM and TEM.N_2adsorption-desorption demonstrates the mesoporous characteristics of the Y_2O_3 nanocubes,showing a relatively high surface area of 60 m^2/g.
基金supported by NSFC (Nos. 21373116 and 21421001)the Tianjin Natural Science Research Fund (No. 13JCYBJC18300)+1 种基金RFDP (No. 20120031110005)the MOE Innovation Team (No. IRT13022) of China
文摘PtSn_2-SnO_2/C nanocatalyst was prepared by co-reduction of Pt and Sn precursor at ca,15℃.The formation of PtSn_2-SnO_2 nanoparticle was determined by XRD,TEM and XPS characterization.This PtSn_2-SnO_2/C nanocatalyst exhibits stronger resistance to CO poisoning and effectively improves methanol electro-catalytic effect,up to 3 times than the commercial Pt/C catalyst.
