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Cho, EunAe,Kwon, HyukSang,Bernard, Frederic 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.4
The electronic properties of the passive film formed on Fe-20Cr ferritic stainless steel in pH 8.5 buffer solution containing 0.05 M EDTA (ethylene diammine tetraacetic acid) were examined by the photocurrent measurements and Mott-Schottky analysis for the film. XPS depth profile for the film demonstrated that Cr content in the outermost layer of the passive film was higher in the solution with EDTA than that in the solution without EDTA, due to selective dissolution of Fe by EDTA. In the solution with EDTA, the passive film showed characteristics of an amorphous or highly disordered n-type semiconductor. The band gap energies of the passive film are estimated to be ∼ 3.0 eV, irrespective of film formation potential from 0 to 700 mV_(SCE) and of presence of EDTA. However, the donor density of the passive film formed in the solution with EDTA is much higher than that formed in the solution without EDTA, due to an increase in oxygen vacancy resulted ti-om the dissolution of Fe-oxide in the outermost layer of the passive film. These results support the proposed model that the passive film formed on Fe-20Cr in pH 8.5 buffer solution mainly consists of Cr-substituted γ-Fe₂0₃.
Cho, Eunae,Jeong, Daham,Paik, Hyun-Dong,Jung, Seunho Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
Dimeric ${\beta}$-cyclodextrin linked by a thioether bridge was synthesized from a reaction of mono-6-iodo-6-deoxy-${\beta}$-cyclodextrin with sodium sulfide, and the structure was analyzed using nuclear magnetic resonance spectroscopy and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The effects of thioether-bridged dimeric ${\beta}$-CD on the aqueous solubility of flavonols (myricetin, quercetin, and kaempferol) were investigated by ultraviolet-visible spectroscopy. The aqueous solubility of myricetin, quercetin, and kaempferol were enhanced 33.6-, 12.4-, and 10.5-fold following the addition of 9 mM of thioether-bridged dimeric ${\beta}$-CD. In comparison, the aqueous solubility of myricetin, quercetin, and kaempferol were enhanced 5.4-, 3.3-, and 2.7-fold using the same concentration of monomeric ${\beta}$-cyclodextrin. Furthermore, the formation of flavonol/thioether-bridged dimeric ${\beta}$-CD inclusion complexes was confirmed with nuclear magnetic resonance, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and scanning electron microscopy. The results showed that the nature of the complexes significantly differed from that of free flavonols. Herein, we suggest that the thioether-bridged dimeric ${\beta}$-CD can act as an effective complexing agent for flavonols.
Poster Session : PS 1003 ; Lactulose Breath Test as Prognostic Factor in Irritable Bowel Syndrome
( Eunae Cho ),( Jong Sun Rew ),( Hyun Soo Kim ),( Chang Hwan Park ),( Seon Young Park ),( Sung Kyu Choi ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Traditional symptom-based therapies of irritable bowel syndrome (IBS) are directed at the relief of individual IBS symptoms. However, prognostic factors for responses to these treatments have not yet been well studied. The purpose of this study was to evaluate predictors for treatment response in patients with IBS. Methods: A total of 183 patients diagnosed with IBS according to Rome III criteria and underwent lactulose breath test (LBT) from October 2010 to June 2014 were reviewed retrospectively. All participants had checked global IBS symptom questionnaire on the day of the LBT. Overall improvement of global IBS symptoms was reassessed after 4 weeks of treatment. Results: Sixty-one subjects (33.3%) were classified as diarrhea-predominant IBS (IBS-D), 38 (20.8%) as constipation-predominant IBS (IBS-C), 17 (9.3%) as mixed-symptoms IBS (IBS-M), and 67 (36.6%) as unspecifi ed type IBS (IBS-U). LBT results were not signifi cantly different in relation to IBS subtypes. One hundred and nineteen patients (65%) had positive LBT, while 64 patients (35%) had negative LBT. Among the 119 patients with positive LBT, overall symptom improvement was observed in 91 patients (76.5%). Subjects with underlying psychological problems were less likely to have symptom improvement (4/28 vs. 3/91 p=0.031). High basal hydrogen level (>20 ppm) was more frequent in the subjects without symptom improvement (6/28 vs. 6/91, p=0.023). However, underlying psychological problems and high basal hydrogen level were not signifi cantly associated with poor treatment response in patients with negative LBT. Conclusions: High basal hydrogen production correlates with poor treatment response in patients with IBS and positive LBT. This result suggests that LBT can be used as a tool for prediction of treatment response in patients with IBS and positive LBT.
Cho Eunae,Park Chang Hwan,Kim Youngjung,Cho Seo Yeon 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.2
Background/Aims: Endoscopic retrograde cholangiopancreatography (ERCP) in patients with surgically altered anatomy (SAA) is challenging to gastrointestinal endoscopists. The aim of this study was to evaluate the impact of scope exchange from a long single balloon enteroscope (SBE) to a gastroscope during SBE-assisted ERCP (SBE-ERCP) in patients with SAA. Methods: Patients who underwent SBE-ERCP between February 2019 and October 2020 were retrospectively identified. Intubation success, scope exchange success, cannulation success, and therapeutic success were analyzed along with complications. Results: Fifty-six patients with various SAAs underwent SBE-ERCP procedures, including Billroth II subtotal gastrectomy (B-II, n=13), pylorus-preserving pancreato-duodenectomy (PPPD, n=6), Roux-en-Y hepaticojejunostomy (REY HJ, n=4), and total gastrectomy with REY anastomosis (TG REY, n=33). Overall intubation, cannulation, and therapeutic success rates were 89.3%, 82.1%, and 82.1%, respectively. Therapeutic success rates did not differ significantly among the type of SAA. Successful scope exchange rate after successful intubation was significantly higher in native papilla (B-II and TG REY, 83.3%, 35/42) compared to bilioenteric anastomosis (PPPD and REY HJ, 0%, 0/8, p<0.001). Intubation success, scope exchange, and cannulation success were associated with therapeutic success (p<0.001). In multivariate analysis, successful scope exchange was the only factor related to cannulation success (p=0.02). The major complication rate was 1.8% (one perforation). Conclusions: SBE-ERCP is a safe and effective procedure to treat biliary problems in patients with SAA. Successful scope exchange may lead to higher therapeutic success by way of cannulation success.