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ACS Cent Sci ; 8(2): 150-152, 2022 Feb 23.
Artigo em Inglês | MEDLINE | ID: mdl-35233446
Nano Lett ; 21(17): 7309-7316, 2021 Sep 08.
Artigo em Inglês | MEDLINE | ID: mdl-34410724


Understanding surface reconstruction of nanocrystals is of great importance to their applications, however it is still challenging due to lack of atomic-level structural information under reconstruction conditions. Herein, through in situ spherical aberration corrected scanning transmission electron microscopy (STEM), the reconstruction of nanocrystalline SnO2 (110) surface was studied. By identifying the precise arrangements of surface/subsurface Sn and O columns through both in situ bright-field and high-angle annular dark-field STEM images, an unexpected added Sn2O model was determined for SnO2 (110)-(1 × 2) surface. The protruded Snδ+ of this surface could act as the active sites for activating O2 molecules according to our density functional theory (DFT) calculations. On the basis of in situ observation of atomic-level reconstruction behaviors and DFT calculations, an energy-driven reconstruction process was also revealed. We anticipate this work would help to clarify the long-standing debate regarding the reconstruction of SnO2 (110) surface and its intrinsic property.

Langenbecks Arch Surg ; 400(7): 767-79, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26318178


PURPOSE: The best treatment of distal radius fractures (DRFs) in the elderly is uncertain. The purpose of this meta-analysis was to compare the outcomes of surgical and nonsurgical management of DRFs in persons 65 years of age or older. METHODS: Medline, Cochrane, EMBASE, and Google Scholar databases were searched until April 27, 2015 using the following search terms: distal radius fracture, conservative treatment, nonoperative treatment, nonsurgical treatment, surgical treatment, operative, elderly, and older. The primary outcome measure was DASH score, and secondary outcomes were functional and radiological assessments. The standard difference in post-treatment means was calculated for the outcomes to compare the two groups. RESULTS: Of 59 articles identified, eight studies with a total of 440 patients in the surgical groups and 449 in the control groups were included in the analysis. No significant differences in DASH score, VAS pain score, grip strength, wrist extension, pronation, or supination, and ulnar deviation were noted between the groups. The nonsurgical group had significantly greater wrist flexion, radial deviation, and ulnar variance and less radial inclination than the surgical group. CONCLUSIONS: Surgical and nonsurgical methods produce similar results in the treatment of DRFS in the elderly, and minor objective functional differences did not result an impact on subjective function outcome and quality of life.

Moldes Cirúrgicos , Fixação Interna de Fraturas/métodos , Fraturas do Rádio/cirurgia , Amplitude de Movimento Articular/fisiologia , Traumatismos do Punho/terapia , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Feminino , Consolidação da Fratura/fisiologia , Avaliação Geriátrica , Humanos , Escala de Gravidade do Ferimento , Masculino , Medição da Dor , Radiografia , Fraturas do Rádio/diagnóstico por imagem , Fraturas do Rádio/terapia , Ensaios Clínicos Controlados Aleatórios como Assunto , Recuperação de Função Fisiológica , Medição de Risco , Traumatismos do Punho/diagnóstico por imagem