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정종헌 ( Jong Heon Jeong ),이지영 ( Ji Young Lee ),이승호 ( Seung Ho Lee ),이애영 ( Ai-young Lee ),홍종수 ( Jong Soo Hong ) 대한피부과학회 2020 大韓皮膚科學會誌 Vol.58 No.10
Rhus is a common cause of allergic contact dermatitis (ACD), particularly in East Asia. Rhus can cause localized contact dermatitis following direct contact with the skin, and systemic contact dermatitis following its ingestion, causing pruritus, erythema, and occasionally blistering. Bullous pemphigoid (BP) is an acquired subepidermal autoimmune bullous disease that typically occurs in the elderly. Although BP usually occurs sporadically, some precipitating factors of BP have been suggested, such as other autoimmune diseases, drugs, and malignancies. We report a rare case of BP induced by ingestion of Rhus in a 54-year-old man who presented with itchy erythematous rash and blisters on the whole body, initially misdiagnosed as ACD, and treated with systemic steroids. (Korean J Dermatol 2020;58(10):691∼693)
알레르기접촉피부염 환자에서 첩포검사 결과의 분석 - 동일기관에서의 10년 전 결과와의 비교
정종헌 ( Jong Heon Jeong ),홍종수 ( Jong Soo Hong ),이승호 ( Seung Ho Lee ),이애영 ( Ai-young Lee ) 대한피부과학회 2020 대한피부과학회지 Vol.58 No.4
Background: Causative antigens in allergic contact dermatitis (ACD) can be changed by several variables, including time and place. Change in antigens over a period of time in the same institution is one way to reduce the variables; however, these investigations have rarely been performed in Korea. Objective: To investigate the change in patch test results by comparing with the results obtained 10 years ago at the same hospital. Methods: Patch test results were analyzed retrospectively through the medical records of patients with suspected ACD who underwent the patch test using Korean standard series between September 2015 and September 2018. The institutional Review Board of the Dongguk University I1san Hospital approved this study. The results of the patch test were compared with those obtained 10 years ago. Results: A total of 360 patients (males: 142, females: 218) were included. Compared with the results obtained 10 years ago, the positivity rates of metal-related allergens (nickel sulfate, cobalt chloride, and potassium dichromate), fragrance allergens, and 4-phenylenediamine base were increased, whereas the positivity rates of mercury ammonium chloride, thimerosal, and formaldehyde were decreased. Conclusion: The patch test results obtained at the same hospital over a 10-year interval suggest that causative allergens in ACD could change with time lapse. In the future, collaborative studies including a number of participating hospitals are needed for obtaining more reliable results. (Korean J Dermatol 2020;58(4):254∼259)
방소영 ( So Young Bang ),정종헌 ( Jong Heon Jeong ),주경빈 ( Kyung Bin Joo ),전재범 ( Jae Bum Jun ),성윤경 ( Yoon Kyoung Sung ) 대한류마티스학회 2009 대한류마티스학회지 Vol.16 No.4
Although gout often initially affects the peripheral joints, gout may also involve the axial joints. The radiologic changes of axial gout are more common than are clinically recognized. According to a recent report, when the spine CT images of peripheral gout were reviewed for features of axial gout, there was about a 14% frequency of suspected axial gout. The vertebral level and the finding with the most common spinal gouty changes were L4 and lumbar facet joint erosions. We describe here the case of a 36-year-old gout patient with low back and right buttock pain and his lesions were unexpectedly diagnostic of lumbar facet joint arthritis and right sacroiliitis.
Biofloc을 기반으로 한 무 환수 사육 시스템의 수질 안정 유지에 미치는 수온의 영향
조서현(Seo-Hyun Cho),정종헌(Jong-Heon Jeong),김명희(Myung-Hee Kim),이규태(Kyu-Tae Lee),김대중(Dae-Jung Kim),김광현(Kwang-Hyun Kim),오상필(Sang-Pil Oh),한창희(Chang-Hee Han) 한국생명과학회 2015 생명과학회지 Vol.25 No.5
본 연구는 바이오플락을 기반으로 한 무 환수 사육 시스템에서 안정된 수질을 유지하기 위한 적정 수온 범위를 조사하였다. 이를 위해 다음과 같이 수온에 대한 5개의 실험 수조를 설정하였다: 10℃, 15℃, 20℃, 25℃ 그리고 30℃. 우선 각각의 실험 수조에 바이오플락을 기반으로 한 사육시스템을 조성하고, 조성된 각 실험 수조에 금붕어를 수용하여 사육수를 교환하지 않고 60일 동안 사육하였다. 바이오플락 기반 사육시스템이 조성되고, 무기 질소화합물들(NH4<SUP>+</SUP>-N, NO2<SUP>-</SUP> -N, 그리고 NO3<SUP>-</SUP> -N)의 농도가 안정되게 낮은 상태는 10℃, 15℃, 20℃, 25℃, 30oC에서 각각 17, 26, 43, 68, 그리고 78일 이후에 유지되었다. 바이오플락 기반 사육 수조에 금붕어를 사육하기 시작하면서 NH4<SUP>+</SUP>-N 농도가 10℃와 15℃에서는 지속적으로 낮은 상태가 유지되었으나, 20℃, 25℃ 그리고 30℃에서는 점진적으로 증가하였다. 10℃와 15℃에서 NO2<SUP>-</SUP> -N과 NO3<SUP>-</SUP> -N의 농도는 낮은 상태가 유지되지 않고 바로 증가하였다. 반면, 20℃ 이상에서 NO2<SUP>-</SUP> -N의 농도는 지속적으로 비교적 안정되게 낮은 농도를 유지하였으며, NO3<SUP>-</SUP> -N의 농도는 점진적으로 증가하였다. 바이오플락 기반 수조에서 15℃ 이하의 조건에서는 NO2<SUP>-</SUP> -N 농도를 낮고 안정된 상태를 유지할 수 없었다. 20℃ 이상에서 pH와 NH4<SUP>+</SUP>-N 농도 사이의 역상관관계가 pH 4.0과 6.0 사이에서 나타났다. pH 4.0과 6.0 범위에서 NH4<SUP>+</SUP>-N 농도가 감소함에 따라 pH는 증가하였다. 그러나 pH 6.0과 8.0 사이에서는 pH와 NH4<SUP>+</SUP>-N 농도 간 상관관계가 없었었으며, pH 6.0 이상에서는 NH4<SUP>+</SUP>-N 농도가 지속적으로 낮은 상태를 유지하였다. 이러한 결과는 20℃ 이상에서 NH4<SUP>+</SUP>-N 농도를 낮고 안정된 상태로 유지하기 위해서는 pH를 6.0 이상 유지해야만 한다는 것을 보여준다. This study explored adequate water temperature ranges for maintaining stable water quality in a biofloc-based zero-water exchange culture system. Five experimental tanks with the following temperatures were set up: 10℃, 15℃, 20℃, 25℃, and 30℃. First, a biofloc-based culture system was developed in the experimental tanks; then, the tanks were stocked with goldfish and went without a water exchange for 60 days. Conditions for developing a biofloc-based culture system and stable water quality in low concentrations of inorganic nitrogen compounds at 10℃, 15℃, 20℃, 25℃, and 30℃ were maintained after 17, 26, 43, 68, and 78 days, respectively. Beginning from when the goldfish were stocked in the biofloc-based culture tanks, concentrations of NH4<SUP>+</SUP>-N remained constant and at low levels at 10℃ and 15℃, but they showed a gradual increase at 20℃, 25℃, and 30℃. Concentrations of NO2<SUP>-</SUP>-N and NO3<SUP>-</SUP>-N at 10℃ and 15℃ did not remain at low levels and immediately increased. While NO2<SUP>-</SUP>-N concentrations at above 20℃ remained constant and stable at relatively low levels, NO3<SUP>-</SUP>-N concentrations showed a gradual increase. Conditions of 15℃ and below could not maintain low and stable concentrations of NO2<SUP>-</SUP>-N. In the pH range of 4.0 to 6.0, NH4<SUP>+</SUP>-N concentration decreased as the pH rose. However, there was no correlation between pH and NH4<SUP>+</SUP>-N concentration in the pH range of 6.0 to 8.0. These results indicate that pH levels should be kept at pH 6.0 and above to maintain a low and stable concentration of NH4<SUP>+</SUP>-N at above 20℃.
저용량 adefovir dipivoxil에 의한 저인산염혈증과 다발성 근육통
유기덕 ( Ki Deok Yoo ),정종헌 ( Jong Heon Jeong ),조수경 ( Soo Kyung Cho ),김근호 ( Gheun Ho Kim ),최호순 ( Ho Soon Choi ),김동선 ( Dong Sun Kim ),전재범 ( Jae Bum Jun ) 대한내과학회 2010 대한내과학회지 Vol.78 No.2
Adefovir dipivoxil (ADV) effectively inhibits lamivudine-resistant hepatitis B virus replication. Hypophosphatemia and elevated serum creatinine are ADV-related nephrotoxicity caused by high-dose ADV. Hypophosphatemic osteomalacia is very rare and is induced by low-dose ADV. A 61-year-old man suffering from chronic hepatitis B manifested with generalized myalgia and bone pain, especially in both ankles and knees. He had been administered ADV for 56 months, since lamivudine-resistant HBV was detected. He developed severe hypophosphatemia and elevated serum alkaline phosphatase levels with a high bone fraction. Bone densitometry and a whole-body bone scan revealed osteoporosis and multiple hot uptake lesions. Blood chemistry and clinical symptoms improved after discontinuing the ADV. (Korean J Med 78:261-265, 2010)
분리기술,열역학 : 화학적으로 표면처리된 활성탄소섬유 디스크에 의한 코발트이온의 전기흡착
김한상 ( Kim Han Sang ),유승곤 ( Yu Seung Gon ),정종헌 ( Jeong Jong Heon ),박광규 ( Park Gwang Gyu ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.6
ACF discs were surface treated using NaOH, HNO, and connected to a graphite bar, for the electrosorption of cobalt ions from an aqueous solution. The total acidity of ACF decreased by NaOH treatment which maintaining the same average pore size and specific surface area. The total acidity, specially carboxyl groups, increased by HNO, treatment, although the specific surface area was reduced by co. 20%. The Point of Zero Charge (PZC) of ACF decreased from pH 3. 1 to 2.6 and 2.2 by HNO, and NaOH treatment, as a result of increases in anode ion density on ACF disc surface. Therefore, the adsorption rate of cabalt ion by NaOH treated ACF disc was twice larger than that of non-treated ACF disc, while that of HNO, treated ACF disc was only one fifth of the non-treated ACF disc in electrosorption. The electrosorption rate increased with the electrolyte concentration, however, it slowly decreased above 0.2 N NaCl because of competition between Co^(2+) and Na`.
Citric acid 용액에 의한 magnetite 용해반응
원휘준 ( Won Hwi Jun ),최왕규 ( Choe Wang Gyu ),김계남 ( Kim Gye Nam ),정종헌 ( Jeong Jong Heon ),오원진 ( O Won Jin ) 한국공업화학회 2003 공업화학 Vol.14 No.5
수용액의 온도를 일정하게 유지한 상태에서 0.05M citric acid (H₃Y)에 대한 마그네타이트 분말의 용해특성을 조사하였다. 모든 실험은 pH 2.0~5.0의 산성영역과 50℃에서 이루어졌으며, 수용액의 pH는 NaOH 및 HNO₃를 사용하여 조절하였다. Citric acid의 이온화 상수를 사용하여 pH의 변화에 따른 해리 화학종별 농도를 계산하였으며 마그네타이트의 표면전위를 측정하였다. 측정된 표면전위 값과 해리 화학종인 H₂Y^(-) 및 HY^(2-)를 비교함에 의해 citric acid에 의한 마그네타이트의 용해특성을 잘 설명할 수 있었다. 마그네타이트로부터 철 성분이 용해될 때까지 3 h 이상의 유도기간이 존재하는 것으로 나타났으며 시간 경과에 따른 철 성분의 농도 변화를 A [1-e^(-B(x-C))] 식으로 묘사하였다. 실험범위의 pH 영역에서 최적화된 변수들을 구하였으며 각 값들의 물리적 의미를 용해반응 모델 식으로부터 설명하였다. Dissolution of magnetite powders by 0.05 hl citric acid (H_(3)Y) was investigated at 50℃. All the tests were performed in the pH range between 2.0 to 5.0, which was adjusted using nitric acid or sordium hydroxide. Concentration of each of the dissociated chemical species of citric acid under various pHs was calculated using the ionization constants. Variation of zeta potential of magnetite with pH changes was also investigated. It was found that the main chemical species in the experimental range were H_(2)Y^(-) and HY^(2-). The dissolution reaction was explained by comparing with the concentration of the dissociated chemical species of citric acid with the zeta potential. Longer than 3 h of induction time was required to dissolve the magnetite. The dissolution behaviour of magnetite was well described by the equation, A[1-e^(H(x-C))]. The parameters of the equation were optimized by Levenberg-Marquardt iteration method. and the physical meaning of each parameter was explained successfully from the model equation.