Comparison of antibacterial effects by the traditionally used medicinal herbal extracts, Caesalpinia Sappan and Paeonia suffruticosa

Sunhwa Hong,Hyun-A Lee,Nahee Bok,Minsun Kim,Yoonhoe Kim,Minji Kang,Sujin Kim,Kahee Park,Sunyoung Park,Hyun Park,Youn-Chul Kim,Okjin Kim 한국실험동물학회 2008 한국실험동물학회 학술발표대회 논문집 Vol.2008 No.-

Evaluation of Biological Nitrate Degradation Rate by Indigenous Microorganism in Column Packed With Nitrate-Contaminated Soils Under Various Conditions

Sunhwa Park,Hyun-Gu Kim,Min-Kyeong Lee,Gyeong-Mi Lee,So-Hyun Kim,Kyungjin Han,Uijeon Hong,Moon-Su Kim,Young Kim,Tae-Seung Kim 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

In vivo inhibition of coronavirus replications by the natural herbal compound including Paeonia suffruticosa

Sunhwa Hong,Hyun-A Lee,Nahee Bok,Minsun Kim,Yoonhoe Kim,Minji Kang,Sujin Kim,Kahee Park,Sunyoung Park,Hyun Park,Youn-Chul Kim,Okjin Kim 한국실험동물학회 2008 한국실험동물학회 학술발표대회 논문집 Vol.2008 No.-

Unusual Li-ion storage through anionic redox processes of bacteria-driven tellurium nanorods

Kim, Min Gyu,Kim, Dong-Hun,Kim, Taeyang,Park, Sunhwa,Kwon, Gukyoung,Kim, Mi Sug,Shin, Tae Joo,Ahn, Hyungju,Hur, Hor-Gil The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.33

<▼1><P>Li-ion storage through an anionic redox process of biogenic tellurium nanorods to provide biogeochemistry with new insight into energy science.</P></▼1><▼2><P>The bacterial respiration process enables the facile and morphologically-selective preparation of nanomaterials, along with the removal of environmentally toxic elements. Bacteria-driven metallic tellurium Te(0) nanorods formed extra- and intracellularly by <I>Shewanella oneidensis</I> MR-1, consisting of a helically-twisted atomic-wire bundle structure, exhibited distinct Li-ion uptake properties after direct or glucose-assisted surface-carbonization of bacterial cells. By synchrotron-based <I>in situ</I> structural characterization during cycling, it was demonstrated that the carbonized polycrystalline Te materials experience phase transition to Li2Te through simple Li-ion diffusion and charge compensation by the anionic redox reaction of metallic Te to polyanionic telluride (Ten<SUP>2−</SUP>). On the other hand, the carbonized amorphous Te materials show simple Li-ion accumulation around Te element with only the anionic redox reaction. The gradual generation of electrostatic interactions between Li<SUP>+</SUP> and Ten<SUP>2−</SUP> ion pairs promotes host lattice stabilization, unlike in other metallic anode systems with volume expansion. We report that the unusual anionic redox chemistry of Te with its structural flexibility drives the reversible Li-ion uptake without any critical structural deterioration, highlighting the potential of tellurium as a new energy conversion and storage material.</P></▼2>

Study on the immunostimulatory activity by the natural herbal extracts

Sunhwa Hong,Hyun-A Lee,Nahee Bok,Minsun Kim,Yoonhoe Kim,Minji Kang,Sujin Kim,Kahee Park,Sunyoung Park,Hyun Park,Youn-Chul Kim,Okjin Kim 한국실험동물학회 2008 한국실험동물학회 학술발표대회 논문집 Vol.2008 No.-

Biogenic Hematite from Bacteria: Facile Synthesis of Secondary Nanoclusters for Lithium Storage Capacity

Kim, Tae-Yang,Park, Sunhwa,Yoon, Younggun,Lee, Ji-Hoon,Jeon, Jeongsuk,Kim, Mi Sug,Kim, Yoojin,Kim, Min Gyu,Hur, Hor-Gil American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.7

<P>Ferrihydrite, or iron(III) (oxyhydr)oxide (Fe(OH)<SUB>3</SUB>), a representative scavenger of environmentally relevant toxic elements, has been repurposed as a low-cost and scalable precursor of well-developed hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) secondary nanoclusters with a hierarchically structured morphology for lithium-ion anode materials. Here, we report that the bacteria <I>Clostridium</I> sp. C8, isolated from a methane-gas-producing consortium, can synthesize self-assembled secondary hematite nanoclusters (∼150 nm) composed of small nanoparticles (∼15 nm) through the molecular structural rearrangement of amorphous ferrihydrite under mild conditions. The biogenic hematite particles, wrapped with graphene oxide reduced in situ by the reducing bacteria <I>Shewanella</I> sp. HN-41 via one-pot synthesis, deliver an excellent reversible capacity of ∼1000 mA h g<SUP>-1</SUP> after 100 cycles at a current density of 1 A g<SUP>-1</SUP>. Furthermore, the heat-treated hematite/rGO exhibits a capacity of 820 mA h g<SUP>-1</SUP> at a high current density of 5 A g<SUP>-1</SUP> and a reversible capacity of up to 1635 mA h g<SUP>-1</SUP> at a current density of 100 mA g<SUP>-1</SUP>. This study provides an easy, eco-efficient, and scalable microbiological synthetic route to produce hierarchical hematite/rGO secondary nanoclusters with potential as high-performance Li-ion anode materials.</P> [FIG OMISSION]</BR>

한국형 소셜로봇 효돌이 지역사회 거주 독거노인의 우울증상과 삶의 질에 미치는 영향

김선화(Sunhwa Kim),김지희(Jihee Kim),김태환(Taehwan Kim),이동림(Dongrim Lee),최선용(Sunyoug Choi),이호상(Hosang Lee),옥경인(Kyungin Ok),이하나(Hana Lee),남일성(Ilsung Nam) 한국노년학회 2020 한국노년학 Vol.40 No.5

본 연구는 서울시 구로구에 거주하는 65세 이상 독거노인 169명을 대상으로 한국형 소셜로봇(효돌)이 독거노인의 우울증상과 삶의 질에 미치는 영향을 파악하기 위해 수행되었다. 효돌은 일상생활관리, 정서 지지·인지기능 향상 등을 위한 컨텐츠를 대상자에게 제공하였다. 연구결과 효돌이 독거노인의 우울증상(SGDS-K)(사전: 6.28±4.10, 사후: 3.40±4.03, 95% CI: 2.18 ~ 3.57)을 경감시켰으며, 삶의 질(EQ-5D)(사전: 0.75±0.15, 사후: 0.78±0.01, 95% CI: -0.05 ~ -0.002)을 증진시켰다. 본 연구는 이러한 결과를 바탕으로 독거노인의 우울을 예방하고 삶의 질을 증진시키며, 독거노인 담당자(전담 사회복지사, 생활관리사)의 소진을 예방하기 위한 전략으로써의 소셜로봇의 활용성을 제시하였다. This research aims to examine the effects of the socially assistive robot(Hyodol) on the depressive symptoms and quality of life of the elderly(n=169) living alone in Guro-gu, Seoul via a single group pre-post study, using paired t-test. Hyodol provided daily life management, contents for emotional support and cognitive function improvement, and etc. Socially assistive robots decreased the depressive symptoms(SGDS-K) of the elderly living alone and improved the quality of life(EQ-5D) of them. Based on these results, the potential of the socially assistive robot, which was the appropriate strategy to prevent depression of the elderly living alone to improve the quality of life and to prevent the exhaustion of social workers was discussed.

강화도의 지질별 지하수 중 자연방사성 물질의 특성

김익현(Ikhyun Kim),김문수(MoonSu Kim),함세영(Se-Yeong Hamm),김현구(Hyunkoo Kim),김동수(Dongsoo Kim),조성진(Seongjin Jo),이헌민(Heonmin Lee),황종연(Jongyeon Hwang),조훈제(Hunje Jo),박선화(Sunhwa Park),정현미(Hyenmi Chung) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1

인천시 강화도의 지질별(중생대 화강암, 선캠브리아 편마암, 편암) 지하수의 자연방사성 물질과 수리지화학 성분의 특성을 연구하였다. 이 연구를 위하여, 8년 동안 69개 관정에서 지하수 시료를 채수하였다. 통계 분석을 이용하여 지하수의 수리지화학 성분과 자연방사성 물질의 관계를 분석하였다. 연구 지역 지하수의 수질유형은 Ca(Na)-HCO 3 형으로 나타났다. 우라늄은 3 개 지하수 시료에서 US EPA의 MCL(최대 오염 물질 수준)인 30 ug/L을 초과하였다. 라돈은 28개 지하수 시료에서 US EPA의 제안치인 AMCL(대체 최대 오염 물질 수준)인 4,000 pCi/L을 초과하였다. 모든 지하수 시료의 전알파(Gross-alpha)는 US EPA MCL인 15 pCi/L를 초과하지 않았다. 지하수에서의 우라늄과 라돈의 평균농도는 화강암에서 가장 높고, 그 다음으로 편마암, 편암의 순이다. 편암 지역의 라돈은 HCO 3 와 –0.40, 우라늄은 SO 4 과 0.54의 상관계수를 보였고, 편마암 지역의 경우 라돈은 우라늄과 0.55, 우라늄은 SO 4 과 0.41의 상관계수를 보였다. 요인분석에 의하면, 지질별로 각각 다른 거동특성을 가진다. 전체 지하수의 통계 분석 결과, 우라늄과 라돈 그리고 지화학 성분들 간에는 대체로 특이한 상관성을 나타내지 않았다. 자연방사성 물질의 거동과 운명을 보다 명확하게 이해하기 위해서는 자연방사성 물질의 수리지질학적, 지구화학적, 지질학적 특성에 대한 보다 상세한 연구가 요구된다. Groundwaters in different rock types (Mesozoic granite, Precambrian gneiss, and schist) of Ganghwa island, Incheon City were characterized by using naturally occurring radioactive materials (NORM) and hydrogeochemical constituents. For the study, groundwater samples from 69 wells had been collected over eight years. Statistical methods were applied to relate hydrogeochemical components and NORM in the groundwater samples. The groundwater samples belonged to Ca(Na)-HCO 3 types. The uranium concentrations in three groundwater samples exceeded 30 ug/L of United States Environmental Protection Agency (US EPA) maximum contaminant level (MCL). The radon concentrations in 28 groundwater samples exceeded 4,000 pCi/L (picocuries per Liter) of US EPA alternative maximum contaminant level (AMCL). Gross-alpha in all the groundwater samples did not exceed 15 pCi/L of US EPA MCL. The average concentrations of uranium and radon in groundwater were the highest in granite area, and then gneiss, schist areas in order. In schist area, the correlation coefficient (R) between radon and HCO 3 is –0.40 and R between uranium and SO 4 is 0.54. In gneiss area, the R between radon and uranium is 0.55 and the R between uranium and SO 4 is 0.41. According to factor analysis, each geological area shows different chemical characteristics. The statistical analysis of whole groundwater resulted in nearly no significant relationship among uranium, radon and chemical constituents. Subsequently, more detailed studies on hydrogeological, geochemical, and geological characteristics related to NORM are required to better understand the behavior and fate of NORM.

Simultaneous Analysis of 13 Pesticides in Groundwater and Evaluation of its Persistent Characteristics

Dahee Song,Sunhwa Park,Sang-Ho Jeon,Ki-In Kim,Jong Yeon Hwang,Moonsu Kim,Hun-Je Jo,Deok-hyun Kim,Gyeong-Mi Lee,Hye-Jin Kim,Tae-Seung Kim,Hyen Mi Chung,Hyun-Koo Kim 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5

For this study, groundwater samples for 3 years from 2011 through 2013 were collected at 106 groundwater monitoring site in Korea. These groundwater samples were analyzed for 13 pesticides such as cabofuran, pentachlorobenzene, hexachlorobenzene, simazine, atrazine, lindane (gamma-HCH), alachlor, heptachlor, chlordane (total), endosulfan (1, 2), dieldrin, endrin, 4,4-DDT. The objectives of this study were to determine the detection frequency and their concentrations of 13 pesticides and evaluate the health risk level considering ingestion, inhalation, and skin contact using concentrations of 13 pesticides in groundwater samples. An analysis was used for the simultaneous determination for 13 pesticides using GC-MS. GC-MS was performed on HP-5ms, using helium (1 ml min<SUP>-1</SUP>) as carrier gas. The average recoveries of the pesticides were from 92.8% to 120.8%. The limits of detection (LODs) were between 0.004 μg L<SUP>-1</SUP> and 0.118 μg L<SUP>-1</SUP> and the limits of quantification (LOQs) were between 0.012 μg L<SUP>-1</SUP> and 0.354 μg L<SUP>-1</SUP>. 106 groundwater wells were selected. 54 wells were from well to monitor background groundwater quality and 52 wells were from well to monitor groundwater quality in industrial or contamination source area. Eight pesticides including pentachlorobenzene, lindane (Gamma-HCH), heptachlor, chlordane (total), Endosulfan (1, 2), dieldrin, endrin, and 4,4-DDT were not detected in groundwater samples. The detection frequency for hexachlorobenzene, alachlor, carbofuran and simazine was 23.4%, 11.4%, 7.3%, and 1.0%, respectively. Atrazine was detected once in 2011. The average concentrations were 0.00423 μg L<SUP>-1</SUP> for carbofuran, 0.000243 μg L<SUP>-1</SUP> for alachlor, 0.00015 μg L<SUP>-1</SUP> for simazine, and 0.00001 μg L<SUP>-1</SUP> for hexachlorobenzene. The detection frequency of hexachlorobenzene was high, but the average concentration was low. In the contaminated groundwater, the detection frequency for hexachlorobenzene, alachlor, carbofuran, simazine and atrazine was 26.1%, 21.3%, 7.1%, 1.9% and 0.3%, respectively. In the uncontaminated groundwater, detection frequency for hexachlorobenzene, carbofuran and alachlor were 20.2%, 7.5%, and 1.9% respectively. Simazine and atrazine were not detected at uncontaminated groundwater wells. According to the purpose of groundwater use, atrazine was detected for agricultural groundwater use. Hexachlorobenzene showed high detection frequency at agricultural groundwater use area where the animal feeding area and golf course area were located. Alachlor showed more than 50% detection frequency at cropping area, pollution concern river area, and golf course area. Atrazine was detected in agricultural water use area. By land use, the maximum detection frequency of alachlor was found near an orchard. For human risk assessment, the cancer risk for the 5 pesticides was between 10<SUP>-7</SUP> and 10<SUP>-10</SUP>, while the non-cancer risk (HQ value) was between 10<SUP>-4</SUP> and 10<SUP>-6</SUP>. For conclusion, these monitoring study needs to continue because of the possibility of groundwater contamination based on various purpose of groundwater use.

Evaluation on Four Volatile Organic Compounds (VOCs) Contents in the Groundwater and Their Human Risk Level

Dahee Song,Sunhwa Park,Sang-Ho Jeon,Jong Yeon Hwang,Moonsu Kim,Hun-Je Jo,Deok-Hyun Kim,Gyeong-Mi Lee,Ki-In Kim,Hye-Jin Kim,Tae-Seung Kim,Hyen Mi Chung,Hyun-Koo Kim 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.4

In this study, we monitored 4 volatile organic compounds (VOCs) such as chloroform, dichloromethane, 1,2-dichloroethane, and tetrachloromethane in groundwater samples to determine the detection frequency and their concentrations and evaluated the health risk level considering ingestion, inhalation, and skin contact. 75 groundwater wells were selected. 24 wells were from monitoring background groundwater quality level and 51 wells were from monitoring groundwater quality level in industrial or contamination source area. In the results, the detection frequency for chloroform, dichloromethane, 1,2-dichloroethane, and tetrachloromethane was 42.3%, 8.1%, 6.0%, and 3.4%, respectively. The average concentrations of VOCs were high in the order of chloroform (1.7 μg L<SUP>-1</SUP>), dichloromethane (0.08 μg L<SUP>-1</SUP>), tetrachloromethane (0.05 μg L<SUP>-1</SUP>), and 1,2-dichloroethane (0.05 μg L<SUP>-1</SUP>). Chloroform had the highest detection frequency and average detection concentration. In the contaminated groundwater, the detection frequency of VOCs was high in the order of chloroform, dichloromethane, 1,2-dchloroethane, and tetrachloromethane. The average concentrations for chloroform, dichloromethane, 1,2-dichloroethane, and tetrachloromethane were 2.23 μg L<SUP>-1</SUP>, 0.08 μg L<SUP>-1</SUP>, 0.07 μg L<SUP>-1</SUP>, and 0.06 μg L<SUP>-1</SUP>, respectively. All the 4 compounds were detected at industrial complex and storage tank area. The maximum concentration of chloroform, dichloromethane, and 1,2-dichloroethane was detected at industrial complex area. Especially, the maximum concentration of chloroform and dichloromethane was detected at a chemical factory area. In the uncontaminated groundwater, the detection frequency of VOCs was high in the order of chloroform, dichloromethane, and 1,2-dchloroethane and tetrachloromethane was not detected. The average concentrations for chloroform, dichloromethane, and 1,2-dichloroethane were 0.57 μg L<SUP>-1</SUP>, 0.07 μg L<SUP>-1</SUP>, and 0.03 μg L<SUP>-1</SUP>, respectively. Although chloroform in the uncontaminated groundwater was detected the most, the concentration of chloroform was not exceeding water quality standards. By land use, the maximum detection frequency of 1,2-dichloroethane was found near a traffic area. For human risk assessment, the cancer risk for the 4 VOCs was 1<SUP>0-6</SUP>~10<SUP>-9</SUP>, while the non-cancer risk (HQ value) for the 4 VOCs is 10<SUP>-2</SUP>~10<SUP>-3</SUP>.