• Proceedings of the Korean Vacuum Society Conference
• /
• 2015.08a
• /
• pp.162.1-162.1
• /
• 2015

The use of plasma has increased in bio-application field in recent years. Particularly, water treated by arc discharge or atmospheric pressure plasma has been actively utilized in bio-industry. In this study, we have developed a plasma activated water generating system. For this system, two kinds of plasma sources; dielectric barrier discharge (DBD) plasma and arc discharge plasma have been used. The discharge energy was calculated using the breakdown voltage and current, and the emission spectrum was measured to investigate the generated reactive species. We also analyzed the amount of reactive oxygen and nitrogen species in water using the chemical methods and nitric oxide sensor. Finally, the influence of plasma generated reactive species on the germination and growth of spinach (Spinacia oleracea) was investigated. Spinach is a green leafy vegetable that contains a large amount of various physiologically active organic compounds. However, it is characterized with a low seed germination rate.

• Bulletin of the Korean Chemical Society
• /
• v.33 no.8
• /
• pp.2675-2678
• /
• 2012

Studies on niobium anodization in the mixture of 1 M $H_3PO_4$ and 1 wt % HF at galvanostatic anodization are described here in detail. Interestingly, duplex niobium oxide consisting of thick barrier oxide and correspondingly thick porous oxide was prepared at a constant current density of higher than 0.3 $mAcm^{-2}$, whereas simple porous type oxide was formed at a current density of lower than 0.3 $mAcm^{-2}$. In addition, simple barrier or porous type oxide was obtained by galvanostatic anodization at a single electrolyte of either 1 M $H_3PO_4$ or 1 wt % HF, respectively. The formation mechanism of duplex type structures was ascribed to different forming voltages required for moving anions.

• Journal of Korean Biological Nursing Science
• /
• v.11 no.2
• /
• pp.136-142
• /
• 2009

Purpose: The purpose of this study was to identify the factors influencing health related to quality of life with hypertension patients. Methods: The subjects of this study were 409 hypertensive patients. Data were collected from March 1st to April 30th, 2008. A questionnaire consisting of exercise barrier, Psychosocial Wellbeing Index (PWI), EuroQol 5D (EQ-5D) was given. The collected data were analyzed with the SPSS program which was used for descriptive statistics, univariate and multivariate analysis. Results: There was a significant relationship between exercise barrier (t=3.57, p=.000), psychosocial wellbeing (F=29.96, p=.000) and health related to quality of life. According to the result of multiple regression, the identified significant factors were an exercise barrier (F=7.09, p=.000) and psychosocial wellbeing (F=21.5, p=.000) with health related to quality of life. Conclusion: Hypertension patients experienced exercise barrier and psychosocial distress which led to a negative effect on health related to quality of life. Therefore it is needed to encourage motivation of lasting of exercise compliance and relieving of psychosocial distress for better health promotion and high quality of life.

• Journal of Korean Biological Nursing Science
• /
• v.2 no.1
• /
• pp.34-48
• /
• 2000

The purpose of this study was to analyse the factors associated with regular exercise in office workers based on the health belief model such as health belief, self efficacy and barrier among office workers. For the study, we surveyed 253 office workers and analysed using SAS package program. That results obtained were as follows; 1. There were significant differences in sex, age, marriage status. 2. Exercise showed a significant association according to 5-6 days/week exercise, used to fitness center in company, exercise before the attendances. 3. The health belief showed a significant association according to 20-29 years old, unmarried and non exerciser. 4. The self efficacy showed a significant association according to female, nondrinker, nonsmoker, regular exerciser, motivation of exercise is maintain health and weak exerciser. 5. The barrier of exercise was high in non exerciser. 6. A negative correlation was observed between the health belief, the self efficacy and the barrier of exercise. In conclusion, this study suggests that the effective exercise program to reinforce the factors based on health belief and self efficacy, have to be developed.

• Journal of Applied Biological Chemistry
• /
• v.54 no.3
• /
• pp.190-196
• /
• 2011

Effectiveness of edible coatings containing soy protein isolate (SPI), in reducing oxidative browning and moisture loss during storage ($4^{\circ}C$) of cut apples, potatoes, carrots, and onions was investigated. The SPI coatings were shown to have antioxidative activity. Furthermore, addition of carboxymethyl cellulose (CMC) to the formulations significantly improved its antioxidative activity. Oxidative discoloration, as determined by Commission Internationale De I'Eclairage (CIE) lightness ($L^*$), redness ($a^*$), and yellowness ($b^*$) color scale, was significantly reduced (p <0.05) by SPI coating treatments over a storage time of 120 min. Loss of lightness was reduced by SPI coatings with and without CMC. These respectively showed 4.03 and 3.71% change of $L^*$ value compared to 8.56% for control. Browning of the control in cut potatoes was significantly increased by 106.6% in contrast to 34.3 and 35.2% for SPI coatings with and without CMC, respectively. The $b^*$ values also reflected effectiveness of SPI. Moisture barrier effect was significantly better for the treatments, compared to the control. SPI coatings reduced moisture loss in apples and potatoes, respectively, by 21.3 and 29.6% over the control. Cut onions did not show any treatment effect both in terms of browning and moisture loss. SPI coatings prove to be good moisture barrier and antioxidative property.

• Applied Chemistry for Engineering
• /
• v.23 no.6
• /
• pp.608-613
• /
• 2012

Dielectric barrier discharge plasma reactor was applied to the removal of ethylene from a simulated storage facility ($1.0m^3$) of fruits and vegetables. The system operated in a closed-loop mode by feeding the contaminated gas to the plasma reactor and recirculating the treated gas back to the storage facility. The experiments were carried out with parameters such as discharge power, circulation flow rate, initial ethylene concentration and treatment time. The rate of ethylene decomposition was mainly controlled by the discharge power and the treatment time. With the other conditions kept constant, the ethylene decomposition rate in the presence of the manganese oxide ozone control catalyst installed downstream from the plasma reactor was lower than that in the absence of it. The suggests that unreacted ozone from the plasma reactor accumulated in the storage facility where it additionally decomposed ethylene. On the basis of an initial ethylene concentration of 50 ppm, the energy requirement for completing the decomposition was about 60 kJ.

• Korean Journal of Environmental Agriculture
• /
• v.24 no.1
• /
• pp.29-33
• /
• 2005

To develop proper soil management practices for reducing soil erosion, experiments were carried out by using lysimeters in Pyeongchang highland, Korea. Lysimeters installed at Hoenggye bad 13% slope, 15 m slope length and 3 m width. Lysimeters with 23% slope, 15 m slope length and 3 m width were also installed at Yongsan. Soil textures in Hoenggye and Yongsan lysimeter plots were silty clay loam and sandy loam, respectively. In the lysimeters potato was cultivated, and slant furrow culture and contour culture were applied. Up-down furrow and continuous fallow lysimeter was included in the experiments as a control plot. For the slant furrow and contour culture methods, minimum furrow mulching and gravel barrier were placed at each end of the furrows in the lysimeters from April to October in 2000 and 2001 to prevent soil and nutrient losses. In Heonggye, in two years experiments, average soil loss of 17 Mg/ha was found in the up-down and continuous fallow lysimeter and 2.6 Mg/ha from furrow minimum straw and slant furrow treatment, and 1.8 Mg/ha from slant furrow and gravel bag treatment. In the contour culture, the soil losses were further reduced. In Yongsan, soil loss in the slant furrow culture without any protection treatment was 167 Mg/ha, and the soil loss was reduce to 61 and 86 Mg/ha with minimum straw and gravel bag treatments, respectively. The soil loss could be reduced more than 45% by furrow minimum straw and gravel barrier. The furrow minimum straw or gravel bag barrier successfully reduced soil loss in clay loam soil in Heonggye, but still the treatments were not enough to reduce soil loss in saprolite piled sandy loam soil in Yongsan.

• Journal of the Korean Physical Society
• /
• v.80
• /
• pp.817-851
• /
• 2022

Nonthermal biocompatible plasma (NBP) sources operating in atmospheric pressure environments and their characteristics can be used for plasma bioscience, medicine, and hygiene applications, especially for COVID-19 and citizen. This review surveyed the various NBP sources, including a plasma jet, micro-DBD (dielectric barrier discharge) and nanosecond discharged plasma. The electron temperatures and the plasma densities, which are produced using dielectric barrier discharged electrode systems, can be characterized as 0.7 ~ 1.8 eV and (3-5) × 10^14-15 cm^-3, respectively. Herein, we introduce a general schematic view of the plasma ultraviolet photolysis of water molecules for reactive oxygen and nitrogen species (RONS) generation inside biological cells or living tissues, which would be synergistically important with RONS diffusive propagation into cells or tissues. Of the RONS, the hydroxyl radical [OH] and hydrogen peroxide H₂O₂ species would mainly result in apoptotic cell death with other RONS in plasma bioscience and medicines. The diseased biological protein, cancer, and mutated cells could be treated by using a NBP or plasma activated water (PAW) resulting in their apoptosis for a new paradigm of plasma medicine.

• Reproductive and Developmental Biology
• /
• v.34 no.3
• /
• pp.153-159
• /
• 2010

The 34 potently pig pheromonal odorants (1-32, 5755 & 7113) through structure-based virtual screening and ligand-based virtual screening method were selected and their ADMET and pharmacokinetics characters were evaluated and discussed quantitatively. The pheromonal odorants were projected on the following pre-calculated models, Caco-2 cell permeability, blood-brain barrier permeation, hERG inhibition and volume-distribution. From the results of in silico study, it is found that an optimal compound (31) either penetrating or have a little ($P_{caco2}$=-8.143) for Caco-2 cell permeability, moderate penetrating ability ($P_{BBB}$=0.082) for blood-brain barrier permeation, the low QT prolongation ($P_{hERG}$=1.137) for the hERG $K^+$ channel inhibition, and low distribution into tissues ($P_{VD}$=-5.468) for volume-distribution. Therefore, it is predicted that the compound (31) a topical application may be preferable from these based foundings.

• Proceedings of the SCSK Conference
• /
• 2003.09a
• /
• pp.498-498
• /
• 2003

Sphingolipids are important structural components of the stratum corneum lipids and serve the epidermal permeability barrier function. Recent investigations on biological activities of sphingolipids have revealed that they have a number of important biological functions in the cell such as cell proliferation and differentiation, anti-inflammation, mediation of signal transduction and many more.(omitted)