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뇌졸중 위험인자를 가진 어지럼 환자에서의 확산강조 자기공명영상
강형구,윤유상,이진희,박인철,이경룡,정상원,구홍두,김승호 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4
Background: The management of vertiginous patients is a great challenge to emergency physicians. We evaluated the diagnostic value of a diffusion-weighted image(DWI) in differentiating central vertigo from the peripheral vertigo in patients who presented no neurological symptoms other than risk factors for stroke. Methods: From March 2000 to February 2001, we retrospectively analyzed the cases of 68 patients who visited the emergency department with symptoms of isolated vertigo and who had risk factors for stroke. DWIs, computed tomograms(CT), and medical records were reviewed, and the final diagnose, the DWIs and the CT readings, the risk factors for stroke, and the time it took waiting for a DWI or CT scan were analyzed. Results: Of the 68 patients, 21(30.8%) had central vertigo: 15 vertebrobasilar transient ischemic attacks(VB-TIA), 4 brain stem infarctions, 1 cerebellar infarction, and 1 cerebellopeduncular infarction. The DWI showed a 28.6% sensitivity, a 97.9% specificity, and an 85.7% positive predictive value in diagnosing central vertigo. It also had a 100% sensitivity in detecting infarctions. Conclusion: A DWI had a comparable sensitivity to MRI in detecting central vertigo and small, but potentially, lethal infarctions in our patient population. We recommend clinical application of DWI in the emergency department evaluation of isolated vertigo patients with risk factors for stroke.
Production of Polyhydroxyalkanoates from Sludge Palm Oil Using Pseudomonas putida S12
( Du-kyeong Kang ),( Cho-ryong Lee ),( Sun Hee Lee ),( Jung-hoon Bae ),( Young-kwon Park ),( Young Ha Rhee ),( Bong Hyun Sung ),( Jung-hoon Sohn ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.5
Polyhydroxyalkanoates (PHAs) are biodegradable plastics produced by bacteria, but their use in diverse applications is prohibited by high production costs. To reduce these costs, the conversion by Pseudomonas strains of P HAs from crude s ludge p alm o il (SPO) a s a n inexpensive renewable raw material was tested. Pseudomonas putida S12 was found to produce the highest yield (~41%) of elastomeric medium-chain-length (MCL)-PHAs from SPO. The MCL-PHA characteristics were analyzed by gas-chromatography/mass spectrometry, gel permeation chromatography, and differential scanning calorimetry. These findings may contribute to more widespread use of PHAs by reducing PHA production costs.
Insights into Enzyme Reactions with Redox Cofactors in Biological Conversion of CO2
Kang Du-Kyeong,Kim Seung-Hwa,Sohn Jung-Hoon,Sung Bong Hyun 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.11
Carbon dioxide (CO2) is the most abundant component of greenhouse gases (GHGs) and directly creates environmental issues such as global warming and climate change. Carbon capture and storage have been proposed mainly to solve the problem of increasing CO2 concentration in the atmosphere; however, more emphasis has recently been placed on its use. Among the many methods of using CO2, one of the key environmentally friendly technologies involves biologically converting CO2 into other organic substances such as biofuels, chemicals, and biomass via various metabolic pathways. Although an efficient biocatalyst for industrial applications has not yet been developed, biological CO2 conversion is the needed direction. To this end, this review briefly summarizes seven known natural CO2 fixation pathways according to carbon number and describes recent studies in which natural CO2 assimilation systems have been applied to heterogeneous in vivo and in vitro systems. In addition, studies on the production of methanol through the reduction of CO2 are introduced. The importance of redox cofactors, which are often overlooked in the CO2 assimilation reaction by enzymes, is presented; methods for their recycling are proposed. Although more research is needed, biological CO2 conversion will play an important role in reducing GHG emissions and producing useful substances in terms of resource cycling.
Excited State Intramolecular Proton Transfer and Physical Properties of 7-Hydroxyquinoline
Kang Wee-Kyeong,Cho Sung-June,Lee Minyung,Kim Dong-Ho,Ryoo Ryong,Jung Kyung-Hoon,Jang Du-Jeon Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.2
The excited state intramolecular proton transfer and physical properties of 7-hydroxyquinoline are studied in various solutions and heterogeneous systems by measuring steady state and time-resolved fluorescence, reflection and NMR spectra. Proton transfer is observed only in protic solvents owing to its requirement of hydrogen-bonded solvent bridge for proton relay transfer. The activation energies of the proton transfer are 2.3 and 5.4 kJ/mol in $CH_3OH$ and in $CH_3OD$, respectively. Dimers of normal molecules are stable in microcrystalline powder form and undergo an extremely fast concerted double proton transfer upon absorption of a photon, consequently forming dimers of tautomer molecules. In the supercage of zeolite NaY, its tautomeric form is stable in the ground state and does not show any proton transfer.
Kang, Jin Yong,Lee, Du Sang,Park, Seon Kyeong,Ha, Jeong Su,Kim, Jong Min,Ha, Gi Jeong,Seo, Weon Taek,Heo, Ho Jin Hindawi 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-
<P>The cognitive effect of<I> Artemisia argyi H. </I>under liquid-state fermentation by<I> Monascus purpureus</I> (AAFM), which has cellular antioxidant activity and neuronal cell viability, on trimethyltin- (TMT-) induced learning and memory impairment in Institute of Cancer Research (ICR) mice was confirmed. Tests were conducted to determine the neuroprotective effects against H<SUB>2</SUB>O<SUB>2</SUB>-induced oxidative stress, and the results showed that AAFM has protective effects through the repression of mitochondrial injury and cellular membrane damage against H<SUB>2</SUB>O<SUB>2</SUB>-induced neurotoxicity. In animal experiments, such as the Y-maze, passive avoidance, and Morris water maze tests, AAFM also showed excellent ameliorating effects on TMT-induced cognitive dysfunction. After behavioral tests, brain tissues were extracted to assess damage to brain tissue. According to the experimental results, AAFM improved the cholinergic system by upregulating acetylcholine (ACh) contents and inhibiting acetylcholinesterase (AChE) activity. AAFM effectively improved the decline of the superoxide dismutase (SOD) level and the increase of the oxidized glutathione (GSH) ratio and lipid peroxidation (malondialdehyde (MDA) production) caused by TMT-induced oxidative stress. The occurrence of mitochondrial dysfunction and apoptosis was also decreased compared with the TMT group. Finally, quinic acid derivatives were identified as the major phenolic compounds in AAFM using ultra-performance liquid chromatography quadrupole-time-of-flight (UPLC-Q-TOF) MS analysis.</P>
저층 철근콘크리트 건물의 간이내진성능 평가법 신뢰성 검증에 관한 연구
이강석 ( Lee Kang Seok ),김용인 ( Kim Young-in ),위정두 ( Wi Jeong-du ),전경주 ( Jeon Kyeong-joo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
A new rapid-screening method for more reasonably evaluating the seismic capacities of low-rise reinforced concrete buildings was proposed in the author's previous research work published in reference[1]. In order to investigate the verification of reliability of the proposed method, in this study, seismic capacities of two RC building examples including a pure frame and a frame with shear walls are evaluated based on the proposed method. At the same time, the detailed seismic performance of the examples are investigated on the basis of the 2nd and 3rd level procedures of the Japanese Standard, non linear static and dynamic analyses, respectively. Finally, relationships between evaluation results of the proposed method and the detailed evaluation methods are compared. Evaluation results indicate that the method proposed in this study compares reasonably well with the detailed evaluation methods.
양파(Allium cepa L.) 음료의 콜린성 활성 증가 및 뇌신경세포 보호로 인한 Amyloid β Peptide 유도에 대한 인지장애 개선 효과
박선경(Seon Kyeong Park),김종민(Jong Min Kim),강진용(Jin Yong Kang),하정수(Jeong Su Ha),이두상(Du Sang Lee),김아나(Ah-Na Kim),최성길(Sung-Gil Choi),이욱(Uk Lee),허호진(Ho Jin Heo) 한국식품영양과학회 2016 한국식품영양과학회지 Vol.45 No.11
본 연구는 양파의 불쾌치를 저감화시킨 무취음료와 양파 과피 추출물을 첨가한 생리활성 성분 강화음료의 H₂O₂로 유도된 산화적 스트레스에 대한 뇌신경세포 보호 효과와 Aβ로 유도된 인지기능 장애 동물모델에서의 개선 효과를 검증하고자 수행되었다. 뇌신경세포 보호 효과에서는 상대적으로 강화음료에서 무취음료 대비 우수한 산화적 스트레스 억제효과 및 생존율을 나타내었다. Aβ로 유도된 인지기능 장애동물모델에 있어 Y-maze, passive avoidance 및 Morris water maze test에서 강화음료가 상대적으로 우수한 학습 및 기억력 개선 효과를 나타내는 것을 확인할 수 있었다. 마우스의 뇌 조직에서 강화음료 그룹은 AChE 활성을 저해하고, 신경전달물질인 ACh의 함량을 증가시킴으로써 Aβ로 유도된 cholinergic system 장애에 있어 개선 효과를 나타내었다. 또한, 마우스 뇌에서 SOD 함량의 증가, oxidized GSH/total GSH와 MDA 함량을 감소시킴으로써 Aβ와 같은 산화적 스트레스 인자에 대한 뛰어난 항산화 효과를 나타내었다. 최종적으로 무취음료와 강화음료의 주요성분들을 QTOF UPLC/MS system을 통하여 분석한 결과, 강화음료의 경우 무취음료보다 생리활성을 가진 2개의 steroidal saponin과 6개의 phenolic 화합물 등이 추가 검출되었다. 이러한 결과들을 종합해볼 때 강화음료는 상대적으로 protocatechuic acid와 quercetin 같은 강력한 항산화 효과를 나타내는 phenolic 화합물과 steroidal saponin 계열에 의한 우수한 인지기능 개선 효과를 기반으로 한 고부가가치 식품으로 활용될 수 있는 산업적 가능성이 있다고 판단된다. To examine the cognitive function of onion (Allium cepa L.) beverages (odourless and fortified), we analyzed in vitro neuronal cell protection against H₂O₂-induced cytotoxicity and performed in vivo tests on amyloid beta (Aβ)-induced cognitive dysfunction. Cellular oxidative stress and cell viability were evaluated by DCF-DA assay and MTT assay. These results show that fortified beverage resulted in better neuronal cell protection than odourless beverage at lower concentration (0∼100 μg/mL). Fortified beverage also showed more excellent acetylcholinesterase (AChE) inhibitory activity (IC50: 4.20 mg/mL) than odourless beverage. The cognitive functions of odourless beverage and fortified beverage in Aβ-induced neurotoxicity were assessed by Y-maze, passive avoidance, and Morris water maze tests. The results show improved cognitive function in both groups treated with beverages. After in vivo tests, cholinergic activities were determined based on AChE inhibition and acetylcholine levels, and antioxidant activities were measured as SOD, oxidized glutathione (GSH)/total GSH ratio, and MDA levels in mouse brain tissue. In a Q-TOF UPLC/MS system, main compounds were analyzed as follows: odourless beverage (five types of sugars and three types of phenolics) and fortified beverages (six types of phenolics and two types of steroidal saponins).
초등 과학영재 학생의 자유탐구 보고서의 시각화 자료 활용 실태 분석 - 인포그래픽을 중심으로 -
정경두 ( Jeong Kyeong Du ),강훈식 ( Kang Hunsik ) 한국초등과학교육학회 2021 초등과학교육 Vol.40 No.2
This study analyzed the use of visualization materials in “free inquiry” reports for scientifically-gifted elementary school students focusing on infographics. From 2017 to 2019, 78 students in grades 4∼6 at a gifted science education institutes in Seoul were selected. The visualization materials in the reports (n=60) of “free inquiry” submitted by the students were analyzed from the viewpoint of using infographics. The analysis of the results showed that the visualization materials were mostly general illustrations, and infographics were very few. In addition, there were more cases of citing the existing infographics than the case of constructing the infographic. Looking at each stage of inquiry, general illustrations or infographics composed by the students appeared in ‘inquiry method’ or ‘inquiry result’ stage, but the existing infographics appeared in ‘theoretical background’ stage. Among the infographic types by ‘expression type’, ‘structural type’ and ‘process type’ were the most frequent and ‘statistical type’ or ‘comparative/analytic type’ was used frequently. Among the infographic types by ‘construction level’, ‘simple reorganization’, ‘simple layout’, and ‘reorganization’ appeared relatively more. Educational implications of these findings are discussed.