• 한국해양환경ㆍ에너지학회지
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• 제2권1호
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• pp.63-73
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• 1999

3파원 해수유동모델을 이용하여 황해의 잔차류를 시뮬레이션한 결과, 북위 34° 25' 위도선을 통한 잔차류량은 조석주기당 약 4km³, 체류시간은 약 6년으로 산성되었고, 황해의 남동 경계선을 통한 잔차류량은 조석주기당 약 13km³, 체류시간은 약 2.5년으로 산정되었다. 황해의 용존산소량은 하계의 해수중 용존산소를 5.0mg/ℓ이상으로 유지하면서, 약 58×10/sup 6/ton의 화학적 산소요구량(COD)윽 수용할 수 있으므로, 유기오염 부하량의 한계로 표현한 황해의 환경용량은 황해고 유입하는 주요 하천들의 연간 유기오염 부하량의 약 8배에 해당한다. 하계에 있어서, 북위 34ℓ 25' 위도선의 전체 수층을 통한 잔차류량은 하루에 약 57×10³ton의 용존산소를 수송하고, 또한 황해의 남동 경계선의 전체 수층을 통한 잔차류량은 하구에 약 203×10³ton의 용존산소를 수송하는 것으로 산정되었다. 따라서 황해가 해수중의 용존산소를 전혀 감소시키지 않고, 유입 하천의 유기오염 부하량을 수용할 수 있는 환경용량은, 북위 34° 25' 위도선을 통한 잔차류에 의한 용존산소 수송량을 기준으로 표현할 경우에는 황해고 유입하는 주요 하천들의 화학적 산소요구량(COD) 부하의 약 3배에 해당하고, 또한 황해의 남동 경계선을 통한 잔차류에 의한 용존산소 수송량을 기준으로 표현하면, 황해로 유입하는 주요 하천들의 화학적 산소요구량(COD) 부하의 약 10배에 해당한다.

• The Korean Journal of Physiology and Pharmacology
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• 제28권3호
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• pp.209-217
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• 2024

In addition to cellular damage, ischemia-reperfusion (IR) injury induces substantial damage to the mitochondria and endoplasmic reticulum. In this study, we sought to determine whether impaired mitochondrial function owing to IR could be restored by transplanting mitochondria into the heart under ex vivo IR states. Additionally, we aimed to provide preliminary results to inform therapeutic options for ischemic heart disease (IHD). Healthy mitochondria isolated from autologous gluteus maximus muscle were transplanted into the hearts of Sprague-Dawley rats damaged by IR using the Langendorff system, and the heart rate and oxygen consumption capacity of the mitochondria were measured to confirm whether heart function was restored. In addition, relative expression levels were measured to identify the genes related to IR injury. Mitochondrial oxygen consumption capacity was found to be lower in the IR group than in the group that underwent mitochondrial transplantation after IR injury (p < 0.05), and the control group showed a tendency toward increased oxygen consumption capacity compared with the IR group. Among the genes related to fatty acid metabolism, Cpt1b (p < 0.05) and Fads1 (p < 0.01) showed significant expression in the following order: IR group, IR + transplantation group, and control group. These results suggest that mitochondrial transplantation protects the heart from IR damage and may be feasible as a therapeutic option for IHD.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.229.2-229.2
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• 2010

한 단계 수성가스전이반응(Single stage water gas shift reaction)을 위해 높은 산소저장능(OSC: Oxygen Storage Capacity)을 가진 $CeO_2$를 담체로 사용하여 $Pt/CeO_2$ 촉매를 설계하였다. 촉매의 제조 조건은 촉매 활성과 매우 밀접한 관계가 있다. 따라서 $Pt/CeO_2$ 촉매에 제조변수를 다양하게 변화하여 성능을 평가하였다. 촉매 반응 실험은 공간속도(GHSV: Gas Hourly Space Velocity) $45,515h^{-1}$에서 수행하였다. 본 연구에서는 $Pt/CeO_2$ 촉매를 최적화하기 위해 촉매 제조 조건 중 소성온도, 배치 당 제조질량, 전구체 그리고 pH 와 같은 다양한 제조 조건으로 촉매의 성능을 평가하였다.

• Journal of Korean Biological Nursing Science
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• 제12권2호
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• pp.97-105
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• 2010

Purpose: The purpose of this study was to examine the effect of yoga and health calisthenics program in the middle aged women on physiological index and life satisfaction. Methods: This research was an one group pretest-posttest design. A pre and post measurement tool of the program was applied to measure body weight, obesity, rate of body fat, vital capacity, inhalation rate of oxygen, sit-up, grasping power, total physical response, body anteversion, body mass index (BMI), total physical strength, physical strength, health age, life satisfaction. Data collected from this tool was analyzed by SPSS in paired t-test. Results: The results were summarized as follows: yoga program group, the body weight, obesity, BMI, %body fat of the decreased. The results of pulmonary yoga group, vital capacity and inhalation rate of oxygen, total physical strength examination results showed a significant difference. Conclusion: In this study, the yoga program was effective in positive on body composition and physical strength, life satisfaction in middle aged women.

• 공업화학
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• 제19권1호
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• pp.31-36
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• 2008

혐기성소화가스(ADG)를 원료로 수소를 제조하여 연료전지에 활용할 경우 ADG에 포함된 황화합물이 개질기의 촉매와 연료전지의 전극에 독으로 작용하므로 금속이온이 담지된 활성탄을 이용하여 황화합물을 제거하였다. 수분과 산소농도에 따라 고정층 흡착량이 변화하였으며, 산소 0.2 vol%, RH 90% 이상일 때 가장 높은 흡착량을 나타내었다. 본 연구에서는 KI 첨착한 활성탄에서 황화합물의 흡착특성을 고정층에서 동특성 실험을 통해 관찰하고 그 결과를 기준으로 흡착탑을 설계 제작 현장실험을 실시하였다.

• 한국토양비료학회지
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• 제50권4호
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• pp.203-214
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• 2017

Environmental toxicity due to cadmium (Cd) pollution in croplands causes critical problems worldwide. Rice (Oryza sativa L.) is an important crop in Asia, including South Korea, and numerous studies have evaluated the relationship between Cd and antioxidants to alleviate Cd uptake from the soil into plants. However, information about the relationship between phosphorus (P) and antioxidants in rice seedlings is still limited with regard to Cd phytotoxicity. We therefore investigated the physiological responses of rice (Oryza sativa L. cv 'Dongjin') seedlings to Cd toxicity and the effect of P application on reactive oxygen species (ROS) and antioxidant changes. The exposure of rice seedlings to $30{\mu}M$ Cd inhibited plant growth; increased the contents of superoxide, hydrogen peroxide, and malondialdehyde; and induced Cd uptake by the roots and leaves. Application of P to Cd-exposed seedlings decreased Cd-induced oxidative stress by enhancing the capacity of ascorbate (AsA) production and ROS-scavenging, and decreased Cd transfer from the roots to the leaves. These results suggest that P application alleviated Cd-induced growth inhibition and oxidative damage by restricting Cd translocation from the roots to the leaves and maintaining sufficient levels of AsA.

• Natural Product Sciences
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• 제18권4호
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• pp.261-265
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• 2012

Xanthohumol was isolated from hops (Humulus lupulus L.), and then investigated anti-oxidant effect by AAPH-induced LLC-PK1 cell and oxygen radical absorbance capacity (ORCA) assays and MMP-12 inhibitory effect by direct MMP-12 inhibition assay. The treatment of xanthohumol protected LLC-PK1 cells from AAPH-induced cell damage such as cell viability, SOD and GSH-px reduction in a dose dependant manner (0.1, 1, and $5{\mu}M$), the SOD value was 2.98, 4.51, and 5.77 U/mg protein, and GSH-px value was 30.12, 49.32, and 60.11 U/mg protein. ORAC value of xanthohumol was showed as 4320, 12004, and $14209{\mu}M$ TE/g at the concentration 0.1, 1, and $5{\mu}M$, respectively. The change of SOD and GSH-px values was significantly correlated with the results of ORAC assay, that is, AAPH-induced cell and ORCA assays. In addition, inhibition of MMP-12 that is known to play an important role in skin aging was 14%, 37%, 46%, and 79% at the concentration of 0.01, 0.1, 1, and $5{\mu}M$, respectively. On the basis of these results, xanthohumol from hops (Humulus lupulus L.) showed interesting biological and pharmacological activity such as anti-oxidant effect and anti-aging.

• 한국수소및신에너지학회논문집
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• 제23권2호
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• pp.111-116
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• 2012

Na promoted Pt/$CeO_2$ catalysts with various Na amounts (1, 2, and 3wt%) have been applied to water gas shift reaction (WGS) at a gas hourly space velocity (GHSV) of 45515 $h^{-1}$. 1wt%Pt-2wt%Na/$CeO_2$ catalyst exhibited the highest WGS activity at $240^{\circ}C$ among the catalysts prepared in this study. In addition, 1wt%Pt-2wt%Na/$CeO_2$ catalyst showed relatively stable activity with time on stream. The high activity/stability of 1wt%Pt-2wt%Na/$CeO_2$ catalyst was correlated to its easier reducibility and higher oxygen storage capacity (OSC). As a result, 2wt% Na promoted Pt/$CeO_2$ can be a promising candidate catalyst for the single stage WGS, which requires high intrinsic activity at very high GHSV.

• Natural Product Sciences
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• 제20권3호
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• pp.176-181
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• 2014

The antioxidant activities of 29 components isolated from the aerial parts of Artemisia iwayomogi were evaluated in vitro and in cell culture. Among the tested compounds, 2, 6, 8, 10, 13, and 14 exhibited the greatest peroxyl radical-scavenging activities in the oxygen radical absorbance capacity (ORAC) assay, and 2, 10, and 14 also showed significant reducing capacities. However, all compounds showed weak metal chelating activities. Their cellular antioxidant activities were evaluated in HepG2 cells. At $10{\mu}M$, compounds 6, 8, and 14 exhibited stronger protection against 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH)-induced oxidative stress than compounds 2, 10, and 13. Moreover, Compounds 2 and 8 were more effective in protecting against $Cu^{2+}$-induced oxidative stress than compounds 6, 10, 13, and 14 at $10{\mu}M$. These results suggest that the phenolic compounds in A. iwayomogi have the potential to be developed as natural antioxidants for the treatment of oxidative stress-related diseases.

• Food Science and Biotechnology
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• 제18권1호
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• pp.239-244
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• 2009

In the current study, inhibitory activity of 8 selected Korean edible plants of Lamiaceae family against $\alpha$-glucosidases, prepared from rat small intestine acetone powder was evaluated. Total flavonoids and oxygen radical absorbance capacity (ORAC) were also investigated. Methyl alcohol extracts of Scutellaria indica (SI) had the highest $\alpha$-glucosidase inhibitory activity relevant for potentially managing hyperglycemia, followed by Clinopodium gracile (CG) and Thymus quinquecostatus (TQ). These 3 species also showed significant antioxidant activity in ORAC system. The $\alpha$-glucosidase inhibitory activity of the extracts was compared to selected phenolics. Among the standard phenolics tested quercetin which was major flavonoid in the extracts had the highest $\alpha$-glucosidase inhibitory activity. CG, TQ, and SI which had high quercetin content and ORAC values also exhibited significant sucrase inhibitory activity. Results suggested that selected 3 Korean Lamiaceae species have the potential development of effective dietary strategy for postprandial hyperglycemia and oxidative stress-linked diabetes complications.