• Preventive Nutrition and Food Science
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• 제5권2호
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• pp.81-85
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• 2000

Bromelain has been used as a meat-tenderizing agent in food processing. To increase the availability of bromelain, microencapsulation into liposome was carried out by the dehydration and rehydration method. Small unilamellar vesicles prepared by sonication treatment showed higher encapsulation efficiency (EE) than by the French press method. In the preparation of liposome, the effect of pH and centrifugal force on EE was also investigated and it showed a higher EE at acidic pH than at alkaline pH with centrifugation at 80, 000$\times$g. The actual EEs except unencapsulated bromelain which bound on the outside surface of liposome by electrostatic interaction also were investigated, and the optimal EE was at pH 4.6, at 0.6 of a ratio of bromelain to phosholipid(18.2%, w/w). Release of bromelain from liposomes was stimulated as the temperature increased at neutral pH.

• 센서학회지
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• 제25권5호
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• pp.310-319
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• 2016

Three types of gap sensors, a capacitive gap sensor, an eddy current gap sensor, and a Hall effect gap sensor are described and evaluated through experiments for the purpose of precise gap sensing for micrometer scale movement, and a novel type of differential hall effect gap sensor is proposed. Each gap sensor is analyzed in terms of resolution and environment dependency including temperature dependency. Furthermore, a transport system for AMOLED deposition is introduced as a typical application of gap sensors, which are recently receiving considerable attention. Based on the analyses, the proposed differential Hall effect gap sensor is found to be the most suitable gap sensor for precise gap sensing, especially for application to a transport system for AMOLED deposition. The sensor shows resolution of $0.63mV/{\mu}m$ for the overall range of the gap from 0 mm to 2.5 mm, temperature dependency of $3{\mu}m/^{\circ}C$ from $20^{\circ}C$ to $30^{\circ}C$, and a monotonic characteristic for the gap between the sensor and the target.

• 한국환경교육학회지:환경교육
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• 제15권1호
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• pp.101-114
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• 2002

This study is an ethnographic case study aiming at understanding the environmental education (EE) classes of 'Discretionary Activity' which has recently been introduced into Korean middle school curricula. To show the characteristics of the classes, researcher described the phenomena unique to two schools. Two middle school teachers were included in this study as research participants. Qualitative approaches were used to understand the status quo of school environmental education, teachers's perspectives on EE and their expectations for learners' changes. Data were gathered using the methods of participant observation during two school terms and in-depth interview with two teachers and nine students. Ethnographic analysis/interpretation methods such as domain analysis were used to analyze the data. To verify the research methodology and conclusions, triangulation, members checking and peers debriefing were used. Research questions emerging through the circulative research process include 1) what are the teachers' perspectives on EE and how do the teachers' perspectives affect their EE teaching? 2) what are the teachers' expectations for learners' changes and how are teachers/researcher able to perceive learners' changes? Two research participants have different life experiences and perspectives on environment and EE. The perspectives had influence on the selection of the contents and the styles of their teaching. Teachers' expectations for learners' changes were also different according to the styles of the teaching.

• Journal of Pharmaceutical Investigation
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• 제35권5호
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• pp.375-381
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• 2005

A rapid and specific high-performance liquid chromatographic method was developed and validated for the simultaneous determination of prostaglandin $E_{1}\;(PGE_{1})$ and prostaglandin $E_{1}$ ethyl ester $(PGE_{1}-EE)$ in hairless mouse skin homogenate. The sample treatment procedure involved deproteination and precipitation by acetonitrile. $PGE_{1}$ and $PGE_{1}-EE$ in supernatant were separated in a reversed-phase C18 column without being interfered by other components present in hairless mouse skin homogenate. 9-Anthracenecarboxylic acid was used as an internal standard. The retention times of $PGE_{1}$, 9-anthracenecarboxylic acid and $PGE_{1}-EE$ were, 4.5, 9.5 and 18.0 min, respectively. The assay showed linearity from 1 to $40\;{\mu}g/ml$ for both $PGE_{1}$ and $PGE_{1}-EE$. Precision expressed as RSD ranged from 2.3 to 14.1 % for $PGE_{1}$ and 1.6 to 11.0% for $PGE_{1}-EE$. Accuracy ranged from 100.5 to 119.6 % for $PGE_{1}$ and from 98.0 to 103.7% for $PGE_{1}-EE$. This method was employed successfully to follow the time course of concentrations of $PGE_{1}$ and $PGE_{1}-EE$ in hairless mouse skin homogenate for stability study.

• JSTS:Journal of Semiconductor Technology and Science
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• 제11권2호
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• pp.88-94
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• 2011

In this paper, we design a 1-kb OTP (Onetime programmable) memory IP in consideration of BCD process based EM (Electro-migration) and resistance variations of eFuse. We propose a method of precharging BL to VSS before activation of RWL (Read word-line) and an optimized design of read NMOS transistor to reduce read current through a non-programmed cell. Also, we propose a sensing margin test circuit with a variable pull-up load out of consideration for resistance variations of programmed eFuse. Peak current through the non-programmed eFuse is reduced from 728 ${\mu}A$ to 61 ${\mu}A$ when a simulation is done in the read mode. Furthermore, BL (Bit-line) sensing is possible even if sensed resistance of eFuse has fallen by about 9 $k{\Omega}$ in a wafer read test through a variable pull-up load resistance of BL S/A (Sense amplifier).

• 한국약용작물학회지
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• 제23권2호
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• pp.155-160
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• 2015

This research evaluate antioxidant and skin-whitening effect of Abeliophyllum distichum Nakai by extraction processes. First, antioxidant effects were follows: EE (70% ethanol extract) showed higher DPPH scavenging activity of 69.66% than WE (hot water exract) 59.13% at $0.3mg/m{\ell}$, also UE's (70% ethanol extract by sonication process) higher than EE. Reducing power was that also EE showed higher than WE, and it was the highest value with UE's because of ultrasonic pretreatment. Next, the whitening effect tyrosinase inhibition activity was measured that EE was 23.88%, WE's was 16.69%, and UE was 23.34%. Ultrasonic pretreatment did not influence to tyrosinase inhibition activity. Cell viability showed low cell toxicity in all groups. UE's inhibited melanin synthesis, 55.1%, that is higher than EE and WE, 52.7% and 39.5%, respectively. As a result, we confirmed that antioxidant activities and skin-whitening effect by extraction process. Also, this results confirmed that the Abeliophyllum distichum Nakai extracts worth as cosmetic materials.

• 한국식품영양과학회지
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• 제43권11호
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• pp.1709-1715
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• 2014

본 연구에서는 다양한 생리활성을 가진다고 알려져 있는 상지의 산업적 이용 증대 및 고부가가치 소재 개발을 목적으로 열수추출, 50% 에탄올추출, 초음파추출 및 가압추출 공정을 사용하여 상지 추출물의 추출방법에 따른 항산화 활성을 조사하였다. 추출수율은 가압추출, 초음파추출, 50% 에탄올추출 및 열수추출 순으로 나타났으며, 총 페놀 함량 및 플라보노이드 함량은 50% 에탄올 추출물에서 각각 334.66 mg/g 및 35.64 mg/g으로 가장 높은 함량을 나타내었으며, ORAC은 50% 에탄올 추출물에서 g당 $3,483.37{\mu}M$로 가장 높은 값을 나타내었다. DPPH radical 소거 활성은 50% 에탄올 추출물이 $100{\sim}1,000{\mu}g/mL$ 농도에서 17.34~65.84%로 가장 높은 활성을 나타내었으며, ABTS radical 소거 활성은 모든 시료에서 농도가 증가함에 따라 소거 활성이 증가하였다. Superoxide radical 소거 활성은 추출방법별 $100{\sim}500{\mu}g/mL$ 농도에서 62.56~98.74%로 높은 소거 활성을 나타내었다. FRAP 및 환원력은 50% 에탄올 추출물이 $100{\sim}1,000{\mu}g/mL$ 농도에서 각각 $189.00{\sim}974.80{\mu}M$ 및 0.12~0.82로 가장 우수하였다. Tyrosinase 저해 활성은 50% 에탄올 추출물이 $1,000{\mu}g/mL$에서 67.20%로 가장 높은 활성을 나타내었다. 따라서 50% 에탄올 추출방법이 상지의 항산화 활성이 우수한 추출물 제조방법으로 적합하였으며 산업적으로 적용 가능할 것으로 사료된다.

• 한방비만학회지
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• 제3권1호
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• pp.7-16
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• 2003

Objectives : The lipolytic effects of catecholamines in adipose tissue are mediated by members of adrenergic receptors. This study was conducted to examine the effects of ${\beta}2-AR$ Gln27Glu (Q27E) polymorphism on obesity indices and risk among obesity clinic patients. Methods : 532 subjects, 38 men and 494 women, who attended a weight loss program in a local obesity clinic were analyzed. Height, weight, BMI, WHR and obesity index were measured or calculated. Body composition was measured by bio-impedance analysis. Genotype of ${\beta}2-AR$ polymorphism in codon 27 was analyzed by PCR-RFLP method. Serum concentrations of fasting glucose, total and HDL cholesterol, and triglyceride were determined by autobiochemical analyzer. Results: The Genotype distributions of ${\beta}2-AR$ gene were QQ type 81.3%, QE type 17.9% and EE type 8%. Therefore, the frequency of E allele of ${\beta}2-AR$ gene was 0.170 in the total subjects. The frequency of the ${\beta}2-AR$ variant genotype(QE+EE) was significantly higher in obese group($BMI{\geqq}25$) compared with non-obese group(p=0.027). Weight was significantly higher in variant(QE+EE) type compared with normal(QQ) type in total subjects(p=0.001), male(p=0.022) and female(p=0.013). BMI, obesity index and WHR were also significantly higher in QE+EE type. Body fat man was significantly higher in QE+EE type in total subjects(p=0.005) and female(p=0.027). When forward stepwise regression analysis was used to create a model of risk predictors of obesity($BMI{\geqq}25$), QE+EE type of ${\beta}2-AR$ gene was found to be a significant risk factor for obesity (p=0.042, ORs 1.597). Conclusions: QE+EE genotype of ${\beta}2-AR$ was associated with increased obesity indices and might be a significant risk factor for obesity.

• Journal of Ginseng Research
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• 제42권3호
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• pp.389-399
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• 2018

Background: The antioxidant effects of Panax ginseng have been reported in several articles; however, little is known about the antimelanogenesis effect, skin-protective effect, and cellular mechanism of Panax ginseng, especially of P. ginseng calyx. To understand how an ethanol extract of P. ginseng berry calyx (Pg-C-EE) exerts skin-protective effects, we studied its activities in activated melanocytes and reactive oxygen species (ROS)-induced keratinocytes. Methods: To confirm the antimelanogenesis effect of Pg-C-EE, we analyzed melanin synthesis and secretion and messenger RNA and protein expression levels of related genes. Ultraviolet B (UVB) and hydrogen peroxide ($H_2O_2$) were used to induce cell damage by ROS generation. To examine whether this damage is inhibited by Pg-C-EE, we performed cell viability assays and gene expression and transcriptional activation analyses. Results: Pg-C-EE inhibited melanin synthesis and secretion by blocking activator protein 1 regulatory enzymes such as p38, extracellular signal-regulated kinases (ERKs), and cyclic adenosine mono-phosphate response element-binding protein. Pg-C-EE also suppressed ROS generation induced by $H_2O_2$ and UVB. Treatment with Pg-C-EE decreased the expression of matrix metalloproteinases, mitogen-activated protein kinases, and hyaluronidases and increased the cell survival rate. Conclusion: These results suggest that Pg-C-EE may have antimelanogenesis properties and skin-protective properties through regulation of activator protein 1 and cyclic adenosine monophosphate response element-binding protein signaling. Pg-C-EE may be used as a skin-improving agent, with moisture retention and whitening effects.

• 한국식품저장유통학회지
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• 제17권6호
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• pp.861-866
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• 2010

산삼배양근을 식품소재 첨가물로의 이용성을 알아보고자 열수 및 70% 에탄올 추출물에 대한 항산화 활성을 측정하였다. 열수추출물의 수율은 건물당 27.86%이었으며, 70% 에탄올추출물은 18.33%이었다. 총 폴리페놀 함량은 열수 및 70% 에탄올 추출물에서 각각 17.90 mg/g 및 22.63 mg/g 이었다. Ginsenoside Rb1 및 Rg1의 함량은 각각 1.45 mg/g 및 0.96 mg/g 이었다. 1~20 mg/mL 농도에서 물추출물 및 70% 에탄올 추출물의 전자공여능은 각각 2.82~60.58% 및 3.88~70.88% 이었으며, 환원력에서는 70% 에탄올 추출물이 0.07~1.90이었고 물 추출물은 대체적으로 낮았다. SOD 유사활성은 물 추출물은 큰 차이가 없었으나 70%에탄올 추출물에서는 농도가 증가함에 따라 유의적으로 증가하였다. 아질산염 소거능은 SOD 유사활성의 결과와 유사하였다. 지질산패 억제능은 70% 에탄올 추출물은 9.18~66.59%로 물 추출물의 4.74~24.88%에 비하여 1.9~2.8 배 높은 활성을 나타내었다. 이상의 결과로 볼 때 산삼배양근 추출물은 70% 에탄올 추출물의 항산화성이 우수하여 산화방지제 및 기능성 증진용 소재 활용에 효과가 있을 것으로 판단된다.