| 1 | Formation of CoAl layered double hydroxide on the boehmite surface and its role in tungstate sorption显示文摘Sorption of tungstate on boehmite(γ-Al OOH)is increased by co-sorption with Co^(2+)over the near-neutral p H range.Batch uptake experiments show up to a 3-fold increase in tungstate uptake over the range WO_4^(2-)=50–1000μmol/L compared to boehmite not treated with Co^(2+).Desorption experiments reveal a corresponding decrease in sorption reversibility for tungstate co-sorbed with Co^(2+).Reaction of boehmite with Co^(2+)results in the formation of Co Al layered double hydroxide(LDH),as confirmed by X-ray diffraction and X-ray absorption spectroscopy.Tungsten L_3-edge X-ray absorption near edge structure(XANES)reveals that W(VI)is octahedrally coordinated in all sorption samples,with polymeric tungstate species forming at higher tungstate concentrations.X-ray diffraction and X-ray absorption spectroscopy indicate that the mechanism for enhancement of tungstate uptake is the formation of surface complexes on boehmite at low tungstate concentrations,while exchange into the Co Al LDH becomes important at higher tungstate concentrations.The results provide a basis for developing strategies to enhance tungstate sorption and to limit its environmental mobility at near-neutral pH conditions. | Hyuck Hur Richard J.Reeder | 2018 | Journal of Environmental Sciences2018，30，3： | 3 |
| 2 | Undiagnosed Borrmann type Ⅱ gastric cancer due to necrosis and regenerative epithelium显示文摘Endoscopic biopsy is essential to the proper diagnosis and treatment of gastric cancer.Unfortunately,the results of endoscopic biopsy are not always the same as what is expected based on gross endoscopic findings.The results of endoscopic biopsy can be negative for malignancy in Borrmann typeⅣadvanced gastric cancer(AGCa)or gastric lymphoma.However,in the case of typeⅡAGCa,repeated biopsies negative for malignancy have not been reported.A 49-year-old male patient underwent esophagogastroduodenoscopy three times due to large gastric ulcer suspected to be Borrmann typeⅡcancer.However,three repeat endoscopic biopsies with multiple specimens showed necrosis and superficial regenerative epithelium without malignant findings.The patient underwent laparoscopic distal gastrectomy with D2 lymph node dissection.The surgical specimen revealed that the mucosal layer was completely replaced with regenerative epithelium without cancer cells. | Joon Hur Jae Hyuck Chang Byung Kee Kim Hoon Young Ko Jong Hwan Lee Soo Jeong Kim Mi Ae Song Tae Ho Kim Chang Whan Kim Sok Won Han | 2014 | World Journal of Gastroenterology2014，20，28： | 2 |
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