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IR study on the reduction of NO and NO2 by hydrazine monohydrate over Fe-BEA zeolite
Gon Seo,Se Min Park,Young San Yoo,Hyun-Sik Han 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
The adsorption of NO and NO2 and their subsequent reduction by hydrazine monohydrate (HDM) over Fe-BEA zeolite were investigated using an FT-IR spectrophotometer equipped with an in-situ cell. Although NO and NO2 molecules were adsorbed on Fe species in an unaltered state, some of them reacted with oxygen atoms, resulting in the adsorption of NO2 and NO3−, respectively. The reducing species that had originated from HDM on Fe-BEA selectively reduced these molecules to N2, while a small amount of N2O was formed in the reduction of NO by HDM. NO and NO2 were rapidly reduced by HDM through their adsorbed state even at 150 oC, and Fe species were required for their adsorption and for the formation of reducing species from HDM.
Skin barrier repair for the prevention of radiation dermatitis in head and neck cancer patients
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: To date, the clinical benefit of topical steroid use has only been demonstrated for radiation dermatitis induced by 50-60Gy in breast cancer. Radiation dermatitis is characterized by erythema, itching, pain, and burning sensation, and there is no consensus on how to prevent it. Objectives: In this study, we clarify the additional benefit of topical steroid and preventive emollient care for radiation dermatitis induced by high-dose (>60Gy) irradiation with chemotherapy in advanced squamous cell carcinoma of the head and neck (SCHN) patients. Methods: Patients with definitive chemoradiotherapy (CRT), when radiation dermatitis grade 1 is seen or total radiation dose reaches 30Gy. If radiation dermatitis worsens to grade 2, the irradiated area will be covered with a moderately absorbent surgical pad only or steroid and topical cream with it. Results: The median radiation dose before the development of grade 2 skin toxicity was <60.5Gy in patients with SCHN. Almost of patients (85.7%) complained burning and local erosion during planned CRT. Standard care was initiated on 78.5% of patients during the study (surgical pad: 78.5%, steroid only:14.4%, emollient only:21.4% both:50.0%). The most effective prescribed modalities in all arms were steroid with emollient in surgical pad covering. Conclusion: This study shows that the clinical benefit of topical steroid and emollient for radiation dermatitis induced by high-dose irradiation with chemotherapy.
Gon Seo,김미영,Ki Won Lee,박정현,신채호,이재영 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The catalytic decomposition of N2O was investigated over Fe-BEA zeolites treated with various methods such as reduction, steaming and dissolution with potassium nitrate and nitric acid solutions in order to deduce the essential components of the active sites for the decomposition. The iron species were characterized by XPS, XANES, ESR,NO adsorption, and linear sweep voltammetry. The reduction-treated Fe-BEA zeolite with the large amounts of Fe(II)and Fe(III) species showed the highest activity. On the contrary, the dissolution treatment with the potassium nitrate solution seriously deteriorated the catalytic activity of the Fe-BEA zeolite by agglomerating iron oxide clusters and interaction between iron and potassium atoms. The catalytic roles of Fe(II)/Fe(III) species and the negative effect of potassium on the catalytic activity of the Fe-BEA zeolites were discussed.
Gon Seo,Young Woo Lim,Jong Ho Kim 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Titania prepared by the calcination of sludge from waste water coagulated by titanium chloride was used as a substituent of the reinforcing material for silica-filled SBR compounds. The titania, mainly composed of anatase,was loosely aggregated and treated with various alkoxy silanes. The partial substitution of silica by the titania and silanemodified titania usually accelerated the cure rate and enhanced the thermal stability of the silica-filled SBR compounds. The extremely low concentration of hydroxyl groups of titania lowered the silica-silica interaction by introducing titania into the moieties of silica particles, resulting in decreases of the Payne effect and fractional hysteresis. Although the titanias modified with silanes were generally effective in enhancing the tensile and dynamic properties of the silicafilled SBR compounds, the silanes which contained mercapto groups, enabling them to react with rubber molecules,exhibited a high wet traction and low rolling resistance without sacrificing their tensile properties.
The prevalence of onychomycosis in patient with neurologic damage
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The role of a number of inherited, acquired and environmental factors has been identified to increase the risk of onychomycosis. Objectives: In this study, we attempt to evaluate the frequency of onychomycosis and etiological factors in patients with neurologic impairment. Methods: We investigated the distribution of gender, age, clinical features and duration of disease for all patients. The studied group (n = 242) included 140 patients with nail abnormalities raising a clinical suspicion of nail onychomycosis (with no history of neurologic impairment) and 102 neurosurgery inpatients. The control group included 80 patients with clinically normal nails. The patients were classified into one of the five diagnostic subgroups with standard photographs as reference. The presence of fungi was confirmed in direct microscopy and culture. Results: The prevalence of onychomycosis did not differ significantly between inpatients with neurologic impair and patients with nail alterations. The characteristics of isolated fungal species is yeast (Candida albicans), dermatophyte (Trichophyton rubrum), and molds (Scopulariopsis brevicaulis). Conclusion: This study shows that significantly higher incidence of onychomycosis was observed in neurologic impair patients as well as in patients with clinically abnormal nails compared to controls. The studied group supports the hypothesis that the nuerologic damange is a risk factor for onychomycosis.
Clinicopathologic findings of primary cutaneous anaplastic large cell lymphoma
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Primary cutaneous anaplastic large cell lymphoma (pcALCL) is a subtype of cutaneous T-cell lymphoma histologically characterized by large, highly atypical CD30+ T-cells. They include two clinically different entities with some overlapping features and borderline cases: lymphomatoid papulosis and primary cutaneous anaplastic large cell lymphoma. Objectives: In this review, we discuss the clinical findings of the latest developments to pcALCL including findings for diagnosis, prognosis, and therapeutic modalities. Methods: We performed a descriptive retrospective study to identify characteristics and distribution of pcALCL patients with purpose of influencing factors. Results: This study shows that patients with pcALCL typically present with solitary or localized nodules or tumors (75%) or, more unusually, papules (12.5%), with frequent ulceration (62.5%) and rapid evolution in some cases (25%) that may simulate and/or appears as progressive lymphomas (75%). Conclusion: This study shows that a clinician keep in mind a variety of clinical features of pcALCL making an accurate diagnosis through early histopathologic examination will lead to better prognosis.