• 한국발생생물학회지:발생과생식
• /
• 제15권1호
• /
• pp.41-52
• /
• 2011

In the present study, embryoid bodies (EBs) obtained from induced pluripotent stem cells (iPSCs) were induced to differentiate into germ lineage cells by treatment with bone morphogenetic protein 4 (BMP4) and retinoic acid (RA). The results were compared to the results for embryonic stem cells (ESCs) and multipotent spermatogonial stem cells (mSSCs) and quantified using immunocytochemical analysis of germ cell-specific markers (integrin-${\alpha}6$, GFR-${\alpha}1$, CD90/Thy1), fluorescence activating cell sorting (FACS), and real time-RT-PCR. We show that the highest levels of germ cell marker-expressing cells were obtained from groups treated with 10 ng/$m{\ell}$ BMP4 or 0.01 ${\mu}M$ RA. In the BMP4-treated group, GFR-${\alpha}1$ and CD90/Thy-1 were highly expressed in the EBs of iPSCs and ESCs compared to EBs of mSSCs. The expression of Nanog was much lower in iPSCs compared to ESCs and mSSCs. In the RA treated group, the level of GFR-${\alpha}1$ and CD90/Thy-1 expression in the EBs of mSSCs Induced pluripotent stem cells, Mouse embryonic stem cells, Multipotent spermatogonial stem cells, Germ cell lineage, Differentiation potential. was much higher than the levels found in the EBs of iPSCs and similar to the levels found in the EBs of ESCs. FACS analysis using integrin-${\alpha}6$, GFR-${\alpha}1$, CD90/Thy1 and immunocytochemistry using GFR-${\alpha}1$ antibody showed similar gene expression results. Therefore our results show that iPSC has the potential to differentiate into germ cells and suggest that a protocol optimizing germ cell induction from iPSC should be developed because of their potential usefulness in clinical applications requiring patient-specific cells.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
• /
• pp.661-661
• /
• 2013

열전재료는 열-전기가 상호 가역적으로 변하는 재료로서, 에너지 변환소재 분야에서 널리 각광받고 있다. 열전재료의 성능은 무차원 열전성능지수(dimensionless figure of merit, $ZT={\alpha}^2{\sigma}T/{\kappa}$)로 평가된다. 여기서 ${\alpha}$는 제벡계수(Seebeck coefficient), ${\sigma}$는 전기전도도(electrical conductivity), ${\kappa}$는 열전도도(thermal conductivity), T는 Kelvin 온도를 나타낸다. 500 K에서 800 K까지의 중온 영역에서 우수한 열전특성을 보이는 $Mg_2X$ (X=Si, Ge, Sn)와 이들의 고용체는 성분원소가 독성이 없고, 매장량이 많아 친환경 열전재료로 각광받고 있다. $Mg_2X$ 고용체 중 $Mg_2Si-Mg_2Sn$ 고용체는 Si와 Sn의 큰 원자량 차이로 인해 낮은 열전도도와 높은 성능지수(ZT)를 얻을 것이라 예상되며 열전발전 소자로서의 응용이 기대된다. Sb가 도핑된 $Mg_{2+x}Si_{0.7}Sn_{0.3}Sb_y$ (x=0, 0.1, 0.2, y=0, 0.01) 고용체를 고상합성과 기계적 합금화로 합성한 후, 진공 열간압축 성형을 통해 성공적으로 제조하였다. X선 회절분석으로 상합성과 고용체 형성 여부를 확인하였고, Mg의 과잉첨가와 Sb 도핑에 따른 열전특성의 변화를 조사하였다.

• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2005년도 총회 및 춘계학술발표회
• /
• pp.312-315
• /
• 2005

Visual MODFLOW 프로그램 내 MT3D 패키지를 이용하여 다공 추적자 시험 해석 모델을 제시하였으며, 개념모델을 설정하여 추적자 해석 모델 모사 시 입력상수인 수리전도도(K), 비산출률$(S_y)$, 유효공극률$(n_e)$, 종분산지수$({\alpha}_L)$ 및 횡분산지수$({\alpha}_T)$ 등에 따른 민감도를 분석하였다. 또한, 이를 이용하여 부산과 이천지역의 현장 추적자 시험 자료를 해석하였다. 민감도 분석 결과, 유효공극률과 종분산지수의 민감도가 가장 크게 나타났으며, 비산출률의 민감도가 가장 작게 나타났다. 유효공극률은 관측정에서 측정되는 추적자의 최고농도를 결정하는 인자이며, 종분산지수는 추적자 최고농도가 되는 경과시간과 관계가 깊은 것으로 나타났다. 재순환 추적자 시험 해석 모델을 적용한 부산지역의 경우 유효공극률은 0.15, 종분산지수는 5m인 것으로 모사되었으며, 수렴 흐름 추적자 시험 해석 모델을 적용한 이천지역의 경우 유효공극률은 0.01, 종분산지수는 13m로 산정되었다.

• 사상체질의학회지
• /
• 제29권2호
• /
• pp.154-173
• /
• 2017

Objectives This study was conducted to evaluate the effects of Yeoldahanso-tang on obesity in rats induced by high fat diet experimentally. Methods The experiment was conducted with rats divided into 5 groups. Rats were evaluated for change of weight, hematologic and serum biochemical parameters. Results Yeoldahanso-tang group showed significant reductions in FER, body weight, adipose tissue weight and size. The level of Creatinine, glucose, ALP, T-cholesterol, Triglyceride, LDL-cholesterol, Leptin and IGF-1 of Yeoldahanso-tang group was significantly lower than those in HFD-CTL group. The level of HDL-cholesterol, free fatty acid and Adiponectin in Yeoldahanso-tang group was significantly higher than those in HFD-CTL group. As compared with HFD-CTL group, AMPK-${\alpha}1$, UCP2 and adiponectin mRNA in liver of Yeoldahanso-tang group were significantly increased and AP2/FABP4, AMPK-${\alpha}2$ and PPAR-${\gamma}$ mRNA in liver of Yeoldahanso-tang group was significantly decreased. Conclusion These results suggest that Yeoldahanso-tang has inhibitory effects on obesity in high fat diet induced obese mice.

• 대한한의진단학회지
• /
• 제17권3호
• /
• pp.263-273
• /
• 2013

Objectives This study was designed to investigate the anti-inflammatory effect of extracts from Ligustrum obtusifolium S. fruits(LOF) in RAW 264.7 Macrophages stimulated with lipopolysaccharide(LPS). Methods We examined productions of nitric oxide(NO), reactive oxygen species(ROS), inducible isoforms of NO synthase(iNOS), cyclooxygenase-2(COX-2) to investigate the anti-inflammatory effect of LOF extracts. In addition, we measured generation of pro-inflammatory cytokines(TNF-${\alpha}$, IL-6). Results Cell viability showed that LOF extracts had no cytotoxicity in Raw 264.7 cells. The treatment with LOF extracts significantly decreased the generation of NO and pro-inflammatory cytokines(TNF-${\alpha}$, IL-6) in LPS-stimulated macrophage cells. Furthermore LOF extracts inhibited intracellular ROS generation dose dependently and reduced the expression of iNOS, COX-2 proteins. Conclusions These results showed that the LOF extracts had an anti-inflammatory effect on LPS-stimulated Raw 264.7 cells. These findings provide scientific support for the use of this Ligustrum obtusifolium S. for inflammatory-related diseases.

• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2019년도 추계학술대회
• /
• pp.76-76
• /
• 2019

The purpose of this study was to evaluate the antioxidant and whitening action of Fagopyrum esculentum and F. tataricum buckwheat seeds depending on their germination time. In a previous study, we reported significant changes in sprout yield and phytochemical content in ethanol extracts from F. esculentum and F. tataricum seeds with increase in germination times. DPPH radical scavenging activities of F. tataricum increased with increasing germination time, whereas that of F. esculentum decreased. Next, we investigated anti-melanogenic activities of these species by estimation of melanin content and tyrosinase activity. Inhibition of melanin production in ${\alpha}-MSH$ (${\alpha}$-melanocyte stimulating hormone)-induced B16F10 cells by extracts from these seeds were analyzed. Among the two, F. tataricum extracts were characterized by higher inhibitory activity against melanin production. In addition, when B16F10 cells were incubated with L-DOPA for detection of in situ tyrosinase activity, F. tataricum and F. esculentum extracts were observed to reduce melanin production in cells. Taken together, these results indicate that extracts from buckwheat seeds could influence cellular processes via modulation of tyrosinase activity. Hence, buckwheat seeds could be utilized as whitening agents in the cosmetic industries and as therapeutics for hyperpigmentation disorders in a clinical setting.

• 한국식품과학회지
• /
• 제29권6호
• /
• pp.1248-1254
• /
• 1997

옻나무를 극성이 각각 다른 chloroform, n-hexane, ethanol에 침지한후 추출물질에 따라 항산화력을 DPPH 및 thiocyanate 방법으로 측정했으며, 쥐 뇌세포를 배양하여 glucose oxidase (GO)에 의해 생성되는 hydroxy radical에 대한 항산화 효과를 측정하였다. DPPH및 thiocyanate 방법에 의한 항산화력은 에탄올 추출물의 항산화력이 다른 용매로 추출한 것에 비해 높았고, column을 이용해 100drop씩 분획하여 얻은 에탄을 추출물 5개 peak중 peak II의 항산화력이 thiocyanate 방법으로 측정한 결과 다른 peak에 비해 컸으며, peak III와 IV의 항산화력은 적었고, peak I과 V의 항산화력은 매우 약하게 나타났다. 항산화 효과에 있어서 쥐 뇌세포에 에탄올 추출물 (30 mg/mL)로서, GO 20 mU/mL system의 hydroxy radical에 대한 에탄올 추출물의 항산화 효과를 측정한 결과는 GO 20 mU/mL만을 처리한 구에서는 쥐 뇌세포의 생존율이 56%인데 반하여, 옻나무 에탄을 추출물을 $1\;{\mu}L\;(297\;{\mu}g/mL)$와 $2\;{\mu}L\;(588\;{\mu}g/mL)$ 첨가시 생존율은 대조구에 비해 각각 59%와 68%였으며, $4\;{\mu}L\;(1,154\;{\mu}g/mL)$ 첨가시 74%, $7\;{\mu}L\;(1,963\;{\mu}g/mL)$와 $10\;{\mu}L\;(2,727\;{\mu}g/mL)$ 첨가시 각각 83% 및 95%로서 높은 생존율을 보였다. 이것은 에탄올 추출물 $10\;{\mu}L\;(2,727\;{\mu}g/mL)$첨가에 있어서 hydroxy radical에 대한 항산화 효과를 대조구에 비교할 때 $P{\leq}0.01$의 유의성을 보여주었다. 한편 에탄올 추출물과 천연항산화제인 ascorbic acid, ${\alpha}-tocopherol$, catalase의 항산화 효과를 비교한 결과 쥐 뇌세포 생존율이 대조구에 비해 $10\;{\mu}L\;(2,727\;{\mu}/mL)$ 에탄올 추출물 첨가시 95%이었고, $10\;{\mu}g/mL$, $20\;{\mu}g/mL$ catalase에서는 각각 98%와 99%였으며, 50 uM, 100uM ascorbic acid는 각각 83%와 88%, 50 uM, 100 uM ${\alpha}-tocopherol$에서는 각각 72%, 77%로 나타났다. 따라서 에탄을 추출물 $273\;{\mu}g/mL$은 $1\;{\mu}/mL$ catalase에 상응되는 항산화력을 가지고 있다.

• 한국치위생학회지
• /
• 제14권6호
• /
• pp.943-949
• /
• 2014

Objectives: The purpose of the study is to investigate the relationship between the personality types and satisfaction of education satisfaction in dental hygiene students. Methods: A self-reported questionnaire was filled out by 898 students in Busan, Gyeongnam, and Ulsan from March 2 to 25, 2014. Data were analyzed through t-test, correlation analysis, and multiple regression analysis. The instruments used personality types and satisfaction of education. The personality types was adapted from Korean Eyesenck Personality Questionnaire that was modified by Lee on the basis of Eysenck Personality Questionnaire(Eysenck & Eysenck, 1971). The questionnaire consisted of 44 questions including extroversion factors(18 questions) and neurotic tendency(26 questions). The questionnaire was score by Likert 5 scale. Cronbach alpha was 0.835 in the study. The neurotic tendency consisted of 26 questions and the higher score showed the higher neurotic tendency. Cronbach alpha was 0.927 in the study. The instrument for satisfaction of education was adapted from Kim and Go and partly modified. The instrument was categorized into dental hygiene department satisfaction(6 questions), major satisfaction(6 questions), facilities satisfaction(4 questions), lecture satisfaction(7 questions), and faculty satisfaction(4 questions). The instrument was scored by Likert 5 scale. Cronbach alpha of education satisfaction was 0.928 in the study. Results: Extroverted students showed 3.70 point which was the highest score in the department satisfaction(p<0.001). Less neurotic students showed 3.68 point which was the highest score in the department satisfaction(p<0.001). There was a strong positive correlation between the major satisfaction and department satisfaction(p<0.01). The personality types that affected the education satisfaction were related to the extroverted students and less neurotic students(p<0.01). Conclusions: The personality types had much influences on the satisfaction of the major and academic accomplishment.

• Nutrition Research and Practice
• /
• 제11권4호
• /
• pp.265-274
• /
• 2017

BACKGROUND/OBJECTIVES: Nelumbo leaves have been used in traditional medicine to treat bleeding, gastritis, hemorrhoids, and halitosis. However, their mechanisms have not been elucidated. MATERIALS/METHODS: The present study prepared two Nelumbo leaf extracts (NLEs) using water or 50% ethanol. Inflammatory response was induced with LPS treatment, and expression of pro-inflammatory mediators (inducible nitric oxide synthase, cyclooxygenase-2, tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$), interleukin (IL)-$1{\beta}$, and IL-6 and nitric oxide (NO) and prostaglandin $E_2$ ($PGE_2$) productions were assessed. To determine the anti-inflammatory mechanism of NLEs, we measured nuclear factor-${\kappa}B$ (NF-${\kappa}B$) activity. Major metabolites of NLEs were also analyzed and quantified. RESULTS: NLEs effectively reduced the expression and productions of pro-inflammatory mediators such as IL-$1{\beta}$, IL-6, TNF-${\alpha}$, $PGE_2$, and NO. NLEs also reduced NF-${\kappa}B$ activity by inhibiting inhibitor of NF-${\kappa}B$ phosphorylation. Both extracts contained catechin and quercetin, bioactive compounds of NLEs. CONCLUSIONS: In this study, we showed that NLEs could be used to inhibit NF-${\kappa}B$-mediated inflammatory responses. In addition, our data support the idea that NLEs can ameliorate disease conditions involving chronic inflammation.

• 생명과학회지
• /
• 제34권4호
• /
• pp.254-263
• /
• 2024

한국의 장은 콩을 발효시켜 만든 식품으로 대표적인 종류로는 고추장, 된장, 청국장, 간장이 있다. 본 연구에서는 콩 발효식품의 미생물 군집을 분석하고, 각 장류의 유형에 따른 미생물 군집 구조 차이에 영향을 미치는 미생물(biomarker)과 분포 차이를 비교하기 위해 총 200종의 장류 시료를 next-generation sequencing을 통해 16S rRNA 마이크로바이옴 분석을 수행하였다. Alpha-diversity 분석 결과 종 풍부도를 나타내는 지수 CHAO는 고추장과 청국장에서 분석에서 된장과 간장 그룹에 비해 유의미하게 높은 경향을 보였다 (p<0.001). 네 가지 장류의 미생물 분포 분석 결과 목(order) 수준에서 Bacillales가 고추장, 된장, 청국장 그룹에서 우세한 반면, 간장의 경우 Lactobacillales가 우세한 것으로 차이가 나타났다. LEfSe (Linear dis- criminant analysis Effect Size)분석을 통해 전통 장류의 과(family)와 종(species) 수준에서 바이오마커를 분석하였다. Leuconostocaceae, Thermoactinomycetaceae, Bacillaceae, Enterococcaceae가 과 수준에서 장 유형에 따른 미생물 군집 구조 차이에 큰 기여를 하는 바이오마커로 나타났으며, Bacillus subtilis, kroppenstedtia sanguinis, Bacillus licheniformis, Tetragenococcus halophilus가 종 수준에서 네 종류의 발효식품을 미생물학적으로 분류할 수 있는 가장 중요한 특징으로 나타났다. PERMANOVA (Permutational multivariate analysis of variance) 분석 결과 네 가지 장류는 미생물 군집 구조가 통계학적으로 유의미한 차이가 나타났으며 (p=0.001), 그 중 간장 그룹의 미생물 군집 구조가 가장 차이를 보였다. 본 연구의 결과는 한국 발효식품의 미생물학적 분포 특성과 장류 유형별 미생물 군집 구조차이에 영향을 미치는 미생물을 규명하였으며, 발효과정에 참여하는 미생물에 대한 지식을 넓히고 발효 콩 식품의 품질을 향상시키는 데 도움이 될 것으로 기대한다.