• 한국미생물·생명공학회지
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• 제23권3호
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• pp.255-262
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• 1995

Intact cells of Acinetobacter sp. T5-7 completely degraded trichloroethylene (TCE) following growth with phenol. This strain could grow on at least eleven aromatic compounds, e.g., benzaldehyde, benzene, benzoate, benzylalochol, catechol, caffeic acid, 2.4-D, p-hydroxybenzoate, phenol, protocatechuate and salicylate, and did grow on alkane, such as octane. But except phenol, other aromatic compounds did not induced TCE degradation. Phenol biotransformation products, catechol was identified in the culture media. However, catechol-induced cells did not degrade TCE. So we assumed that phenol hydroxylase was responsible for the degradation of TCE. The isolate T5-7 showed growth in MM2 medium containing sodium lactate and catechol rather than phenol, but did not display phenol hydroxyalse activity, suggesting induction of enzyme synthesis by phenol. Phenol hydroxylase activity was independent of added NADH and flavin adenine dinucleotide but was dependent on NADPH addition. Degradation of phenol produced catechols which are then cleaved by meta-fission. We identified catechol-2.3-dioxygenase by active staining of polyacrylamide gel.

• The Korean Journal of Physiology and Pharmacology
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• 제2권4호
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• pp.427-433
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• 1998

In brain hypoxic-ischemia, an excess release of glutamate and a marked production of reactive oxygen species (ROS) occur in neuronal and non-neuronal cells. The present study investigated the effect of the biological antioxidants dihydrolipoic acid (DHLA) and lipoic acid (LA) on N-methyl-D-aspartate (NMDA)- and ROS-induced neurotoxicity in cultured rat cortical neurons. DHLA enhanced NMDA-evoked rises in intracellular calcium concentration ($[Ca^{2+}]_i$). In contrast, LA did not alter the NMDA-evoked calcium responses but decreased after a brief treatment of dithiothreitol (DTT), which possesses a strong reducing potential. Despite the modulation of NMDA receptor-mediated rises in $[Ca^{2+}]_i$, neither DHLA nor LA altered the NMDA receptor-mediated neurotoxicity, as assessed by measuring the amount of lactate dehydrogenase released from dead or injured cells. DHLA, but not LA, prevented the neurotoxicity induced by xanthine/xanthine oxidase-generated superoxide radicals. Both DHLA and LA decreased the glutathione depletion-induced neurotoxicity. The present data may indicate that biological antioxidants DHLA and LA protect neurons from ischemic injuries via scavenging oxygen free radicals rather than modulating the redox modulatory site(s) of NMDA receptor.

• Archives of Pharmacal Research
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• 제22권5호
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• pp.479-484
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• 1999

In this study, the effects of ursodeoxycholic acid (UDCA) on ischemia/reperfusion injury were investigated on isolated heart perfusion model. Hearts were perfused with oxygenated Krebs-Henseleit solution (pH 7.4, $37^{\circ}C$) on a Langendroff apparatus. After equilibration, isolated hearts were treated with UDCA 20 to 160 $\mu$M or vehicle (0.04% DMSO) for 10 min before the onset of ischemia. After global ischemia (30 min), ischemic hearts were reperfused and allowed to recover for 30 min. The physiological (i.e. heart rate, left ventricular developed pressure, coronary flow, double product and time to contracture formation) and biochemical (lactate dehydrogenase; LDH) parameters were evaluated. In vehicle-treated group, time to contracture formation was 21.4 min during ischemia, LVDP was 18.5 mmHg at the endpoint or reperfusion and LDH activity in total reperfusion effluent was 54.0 U/L. Cardioprotective effects of UDCA against ischemia/reperfusion consisted of a reduced TTC $(EC_{25}=97.3{\mu}M)$, reduced LDH release and enhanced recovery of cardiac contractile function during reperfusion. Especially, the treatments of UDCA 80 and $160 {\mu}M $ significantly increased LVDP and reduced LDH release. Our findings suggest that UDCA ameliorates ischemia/reperfusion-induced myocardial damage.

• 한국한의학연구원논문집
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• 제12권1호
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• pp.103-109
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• 2006

We investigated liver protection effect of the Hovenia dulcis Thunb extraction which has treated with carbon tetrachloride ($CCl_4$, 1.0 ML/kg) in SD male rat (20 weeks). We observed the amount of leukocyte, erythrocyte, hemoblobin and hematocrit are increased and the number of plaque is decreased for treatment of $CCl_4$, However, after treatment of Hovenia dulcis Thunb extraction (15 mL/kg), we have same result that of control group which has treated with $CCl_4$ The blood biological data showed that the value of AST (Aspartate aminotransferase), ALT(Alanine aminotransferase) and LDH (Lactate dehydronase) are increased significantly for the negative control group compared to that of control group. For experimental group, respectively, In addition, it was confirmed that the recovery effect of a mysterious death of an interstitial cell of the experimental group is to be compared to that of the negative control group for a sample of pathological tissue.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 2002년도 학술대회지
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• pp.545-555
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• 2002

Ginsenosides of 20(S)-protopanaxadiol and 20(S)-protopanaxatriol classification including the aglycones, PD, PI and ginsenosides Rh2, Rhl were shown to posses characteristic effects on proliferation of THP-l human leukaemia cells. A similar result was not apparent for ginsenoside Rg3 or dexamathasone. The concentration to inhibit $50\%$ of cells $(LC_{50})$ for PD, Rh2, PI and Rhl were 13 ${\mu}g/mL,\;15{\mu}g/mL,\;19{\mu}g/mL\;and\;210\;{\mu}g/mL$ respectively. Cell cycle analysis showed apoptosis with PD and PI treatment of THP-1 cells resulting in a build up of sub-G1 cells after 24, 48 and 72 hours of treatment. Rh2, and dexamathasone treatments also increased apoptotic cells after 24 hours, where as Rhl did not. After 48 and 72 hours Rh2, Rhl and dexamathasone similarly increased apoptosis, but these effects were significantly (P<0.05) lower than observed for both PD and PI treatments. Furthermore, treatments that produced the largest build up of apoptotic cells were also found to have the largest release of lactate dehydrogenase (LDH). It can be concluded from these studies that the presence of sugars to PD and PI aglycone structure reduces the potency to induce apoptosis, and alternately alter membrane integrity. These cytotoxic effects to THP-l cells were different from dexamethasone.

• 대한임상검사과학회지
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• 제53권3호
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• pp.201-207
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• 2021

The 2019 coronavirus outbreak poses a threat to scientific, societal, financial, and health resources. The complex pathogenesis of severe acute respiratory syndrome coronavirus centers on the unpredictable clinical progression of the disease, which may evolve abruptly and result in critical and life-threatening clinical complications. Effective clinical laboratory biomarkers that can classify patients according to risk are essential for ensuring timely treatment, and an analysis of recently published studies found cytokine storm and coagulation disorders were leading factors of severe COVID-19 complications. The following inflammatory, biochemical, and hematology biomarkers markers have been identified in COVID-19 patients; neutrophil to lymphocyte ratio, c-reactive protein, procalcitonin, urea, liver enzymes, lactate dehydrogenase, serum amyloid A, cytokines, d-dimer, fibrinogen, ferritin, troponin, creatinine kinase, and lymphocyte, leukocyte, and platelet counts. These factors are predictors of disease severity and some are involved in the pathogenesis of COVID-19. CRP is an acute-phase, non-specific serological biomarker of inflammation and infection and is related to disease severities and outcomes. In the present study, CRP levels were found to rise dramatically among COVID-19 patients, and our findings suggest CRP could be utilized clinically to predict COVID-19 prognosis and severity even before disease progression and the manifestation of clinical symptoms.

• 한국식품영양학회지
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• 제17권3호
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• pp.328-336
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• 2004

돌복숭아(Prunus persica Batsch var. davidiana Max.)의 생리 활성 추출 물질이 생체내 지질 대사 이상 및 각종 질환의 예방과 개선효과 등에 많은 생리적 효능이 있을 것으로 판단되어 실험동물을 통한 혈청 지질개선 작용과 간 기능 효소의 활성 변동등을 구명하기 위해 Sprague Dawley계 숫 흰쥐에 기본 식이만을 급여한 대조군과 돼지 기름, 콜레스테롤 등으로 유발된 고지혈증 군, 고지혈증을 유발한 군에 돌복숭아 5.0 g% 추출액을 각각 급여하여 5주간 실험 사육한 결과, 혈청 총콜레스테롤 농도, 동맥 경화 지수, low density lipoprotein (LDL) 및 LDL-콜레스테롤, 유리 콜레스테롤, 콜레스테롤 에스테르 비, 중성지방, 인지질 농도 및 혈당 농도 등에서 돌복숭아 추출액을 급여하므로서 유의성 있는 농도감소를 나타내었으며, HDL-콜레스테롤 농도 및 총콜레스테롤에 대한 HDL-콜레스테롤의 비는 상승되는 것으로 나타났다. 또한, AST, ALT, LDH 및 ALP활성도 고지혈증 유발군에 돌복숭아 추출액을 급여함으로써 유의적으로 저하되는 것으로 나타났다. 따라서 돌복숭아의 추출액이 지질 대사이상 등에서 모는 각종 성인병의 예방 및 치료 개선 효과가 있을 것으로 사료된다.

• 한국수산과학회지
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• 제31권4호
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• pp.523-528
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• 1998

즉살 활어 수송방법을 확립시키기 위한 연구의 일부로, 냉각시키기 전에 활 넙치의 생사의 차이가 냉각저장 ($0^{\circ}C$)중에 넙치육의 사후조기의 물리$\cdot$화학적 변화에 미치는 영향에 대하여 실험한 결과를 요약하면 다음과 같다. 1. 냉각시키기 전에 살아있는 것이 마취사 시킨 것보다 경직개시시간 및 완전경직에 도달하는 시간이 빨랐다. 2. ATP 분해도 냉각시키기 전에 살아있는 것이 마취시킨 것보다 빨랐다. 즉, 냉각시키기 전에 살아있는 것은 냉각저장 17.5시간 후에 완전히 분해되었지만, 마취사 시킨 것은 20시간까지 서서히 감소하다가 그 후에 급속히 분해되어 30시간 후에 완전히 분해되었다. 3. 육의 파괴강도는 냉각시키기 전에 살아있는 것이 냉각저장 7.5시간후에 대조구보다 약 $26\%$증가하여 최대값을 나타내었으며, 마취사 시킨 것은 저장 20시간 후에 약 $22\%$만큼 증가하여 최대값을 나타내었다. 4. 유산의 증가는 냉각시키기 전에 마취사 시킨 것은 저장 10시간까지 유산생성이 억제되었으며, 그 이후로 증가하여 저장 25시간 후에 최대값에 도달하였다 한편, 살아있는 것은 유산의 증가가 빨라 저장 15시간 후에 최대 값에 도달하였다.

• Animal Bioscience
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• 제34권6호
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• pp.1029-1037
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• 2021

Objective: This study was conducted to investigate effects of antifungal substance and carboxylesterase-producing inoculant on fermentation indices and rumen degradation kinetics of whole crop rice (WCR) silage ensiled at different dry matter (DM) contents. Methods: Dual-purpose inoculants, Lactobacillus brevis 5M2 and Lactobacillus buchneri 6M1, confirmed both activities of antifungal and carboxylesterase in the previous study. The WCR at mature stage was chopped, and then wilted to obtain three different DM contents consisting of 35.4%, 43.6%, and 51.5%. All WCR forages were applied distilled water (CON) or mixed inoculants with 1:1 ratio at 1×105 colony forming unit/g (INO), and ensiled into 20 L mini silo (5 kg) in quadruplicates for 108 d. Results: The INO silages had lower lactate (p<0.001) and butyrate (p = 0.022) with higher acetate (p<0.001) and propionate (p<0.001) than those of CON silages. Ammonia-N (p<0.001), lactate (tendency; p = 0.068), acetate (p = 0.030), and butyrate (p<0.001) concentrations of INO silages decreased linearly with increasing DM content of WCR forage. The INO silages presented higher lactic acid bacteria (p<0.001) with lower molds (p<0.001) than those of CON silages. Yeasts (p = 0.042) and molds (p = 0.046) of WCR silages decreased linearly with increasing DM content of WCR forage. In the rumen, INO silages had higher the total degradable fraction (p<0.001), total volatile fatty acid (tendency; p = 0.097), and acetate (p = 0.007), but lower the fractional degradation rate (p = 0.011) and propionate (p<0.001) than those of CON silage. The total degradable fraction (p<0.001), total volatile fatty acid (p = 0.001), iso-butyrate (p = 0.036), and valerate (p = 0.008) decreased linearly with increasing DM content of WCR forage, while the lag phase (p<0.001) was increased linearly. Conclusion: This study concluded that application of dual-purpose inoculants on WCR silage confirmed antifungal and carboxylesterase activities by inhibiting mold and improving rumen digestibility, while increase of wilting times decreased organic acids production and rumen digestibility.

• Korean Journal of Radiology
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• 제21권11호
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• pp.1265-1272
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• 2020

Objective: We investigated the prevalence of pneumonia in novel coronavirus disease 2019 (COVID-19) patients using chest radiographs to identify the characteristics of those with initially negative chest radiographs, who were positive for pneumonia on follow-up. Materials and Methods: Retrospective cohort data of 236 COVID-19 patients were reviewed. Chest radiography was performed on admission, with serial radiographs obtained until discharge. The 'positive conversion group' was defined as patients whose initial chest radiographs were negative but were positive for pneumonia during follow-up. Patients with initially positive chest radiographs were defined as the 'initial pneumonia group.' Patients with negative initial and follow-up chest radiographs were defined as the 'non-pneumonia group.' Clinical and laboratory findings were compared between groups, and predictors of positive conversion were investigated. Results: Among 236 patients, 108 (45.8%) were in the non-pneumonia group, 69 (29.2%) were in the initial pneumonia group, and 59 (25%) were in the positive conversion group. The patients in the 'initial pneumonia group' and 'positive conversion group' were older, had higher C-reactive protein (CRP) and lactate dehydrogenase levels, and lower absolute lymphocyte counts than those in the 'non-pneumonia group' (all p < 0.001). Among patients with negative initial chest radiographs, age ≥ 45 years (odds ratio [OR]: 3.93, 95% confidence interval [CI]: 1.76-8.75, p = 0.001), absolute lymphocyte count < 1500 cells/μL (OR: 2.25, 95% CI: 1.03-4.89, p = 0.041), and CRP > 0.5 mg/dL (OR: 3.91, 95% CI: 1.54-9.91, p = 0.004) were independent predictors for future development of pneumonia. Conclusion: More than a half of COVID-19 patients initially had normal chest radiographs; however, elderly patients (≥ 45 years of age) with abnormal laboratory findings (elevated CRP and low absolute lymphocyte counts) developed pneumonia on follow-up radiographs.