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윤정빈,김광하,박도윤,김영금,편성익,이봉은,송근암 대한상부위장관ㆍ헬리코박터학회 2017 Korean Journal of Helicobacter Upper Gastrointesti Vol.17 No.2
Background/Aims: Gastric hepatoid adenocarcinoma (GHA), a rare type of primary gastric cancer, is characterized by a histologyresembling hepatocellular carcinoma. Previous case studies reported that patients with GHA have a poor prognosis due to earlylymph node or liver metastasis, but information concerning GHA is still limited. Therefore, we aimed to evaluate the clinicopathologicalfeatures of GHA. Materials and Methods: We reviewed the medical records of 9 patients who were diagnosed as having GHA between January 2011and December 2016. The clinicopathological characteristics of these patients were retrospectively analyzed. Results: The median age of the patients at diagnosis was 68.9 years. Seven of the 9 patients were male. Serum AFP levels were elevatedin 3 of 4 patients. All the tumors were >4 cm (range, 4∼12 cm), and 7 tumors were located at the lower third of the stomach. Five tumors were classified as Borrmann’s type 3, with a purple, berry-like surface. Of the 6 patients without distant metastasis, 5received curative-intent surgery and 3 received adjuvant chemotherapy. Three patients with distant metastasis received either palliativeoperation and/or chemotherapy. Their median survival time was 11.8 months (range, 1∼36 months). Two patients with elevatedserum CEA levels had poor outcomes. Conclusions: GHA is a rare subtype of gastric cancer that is prone to liver metastasis. All GHAs are advanced gastric cancer witha purple, berry-like surface at diagnosis. Although the prognosis of advanced-stage GHA is poor, active multimodality treatmentmight provide some benefit.
Determination of Water Content in Bioethanol Using the 1H NMR Chemical Shift Change
윤정빈,윤수연,김병주,안상두,최기환 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.4
Chemical shift change in 1H NMR spectroscopy was used to determine water content in bioethanol. As water content in ethanol is increased, the proton peaks shifted to down-field due to the change in the microstructure of the water-ethanol mixture. The linear correlation between water content and chemical shift change enables the evaluation of water content in bioethanol. Because the same relationship between chemical shift change and the water content is obtained for both ethanol and bioethanol, water content in bioethanol can be determined using the calibration curve obtained with anhydrous ethanol. The developed method was validated by comparison to the results of Karl Fischer titration and was applied to commercially available bioethanols.