Proceedings of the Korean Vacuum Society Conference
/
2011.02a
/
pp.407-408
/
2011
Natural boron consists of two stable isotopes 10B and 11B with natural abundance of 18.8 atom percent of 10B and 81.2 atom percent of 11B. The thermal neutron absorption cross-section for 10B and 11B are 3837 barn and 0.005 barn respectively. 10B enriched specific compounds are used for control rods and as a reactor coolant additives. In this work 2 methods for boron enrichment were analysed: 1) Gas irradiation in static conditions. Dissociation occurs due to multiphoton absorption by specific isotopes in appropriately tuned laser field. IR shifted laser pulses are usually used in combination with increasing the laser intensity also improves selectivity up to some degree. In order to prevent recombination of dissociated molecules BCl3 is mixed with H2S 2) SILARC method. Advantages of this method: a) Gas cooling is helpful to split and shrink boron isotopes absorption bands. In order to achieve better selectivity BCl3 gas has to be substantially rarefied (~0.01%-5%) in mixture with carrier gas. b) Laser intensity is lower than in the first method. Some preliminary calculations of dissociation and recombination with carrier gas molecules energetics for both methods will be demonstrated Boron separation in SILARC method can be represented as multistage process: 1) Mixture of BCl3 with carrier gas is putted in reservoir 2) Gas overcooling due to expansion through Laval nozzle 3) IR multiphoton absorption by gas irradiated by specifically tuned laser field with subsequent gradual gas condensation in outlet chamber It is planned to develop software which includes these stages. This software will rely on the following available software based on quantum molecular dynamics in external quantized field: 1) WavePacket: Each particle is treated semiclassicaly based on Wigner transform method 2) Turbomole: It is based on local density methods like density of functional methods (DFT) and its improvement- coupled clusters approach (CC) to take into account quantum correlation. These models will be used to extract information concerning kinetic coefficients, and their dependence on applied external field. Information on radiative corrections to equation of state induced by laser field which take into account possible phase transition (or crossover?) can be also revealed. This mixed phase equation of state with quantum corrections will be further used in hydrodynamical simulations. Moreover results of these hydrodynamical simulations can be compared with results of CFD calculations. The first reasonable question to ask before starting the CFD simulations is whether turbulent effects are significant or not, and how to model turbulence? The questions of laser beam parameters and outlet chamber geometry which are most optimal to make all gas volume irradiated is also discussed. Relationship between enrichment factor and stagnation pressure and temperature based on experimental data is also reported.
This study investigated the properties and antioxidative activities of phenolic acid concentrates of rice bran. Rice bran contains bioactive substances such as phenolic compounds, which can provide health benefits as natural antioxidants. This study examined how levels of phenolic acids can be obtained efficiently through various extraction methods. The extractions of defatted rice bran were followed by using ethylacetate (RBE-I), ethylacetate after alkaline hydrolysis (RBE-II), and 80% methanol (RBE-III). For all extracts, yields (%), total polyphenol contents (TPC), various phenolic acids and antioxidative activities were estimated. RBE-II had the highest total polyphenol contents (526.72 mg/100 g rice bran) and showed high antioxidative activity (74.7%). To concentrate the phenolic acids, RBE-II was passed through Sep-pak $C_{18}$ Vac cartridge and F1-RBE-II was collected by the elution of 50% methanol. The total phenolic content of F1-RBE-II (736.8 mg/100 g rice bran) was higher than that of RBE-II (367.1 mg/100 g rice bran), and the ratios of ferulic acid (73%) and sinapic acid (14%) increased. As RBE-II was analysed by HPLC, 6 different phenolic acids were found via chromatography, whereas F1-RBE-II showed 5 different peaks and the major phenolic acid was identified as ferulic acid. The ABTS radical scavenging activity of F1-RBE-II was the highest among the rice bran extracts. In a ${\beta}$-carotene-linoleic acid model system, linoleic acid oxidation was reduced by F1-RBE-II (73%) and RBE-II (35%).
[ $ZnCr_2O_4$ ] shows geometrically frustrated magnet. Recently, $CoCr_2O_4$ has been investigated for multiferroic property and dielectric anomalies by spin-current model. Polycrystalline $CoCr_2O_4$ and $CoCrFeO_4$ compounds was prepared by wet-chemical process. Crystallographic and magnetic properties of $CoCr_2O_4$ and $CoCrFeO_4$ were investigate by using the x-ray diffractometer(XRD), vibrating sample magnetometer(VSM), superconducting quantum interference device magnetometer(SQUID), and $M\"{o}ssbauer$ spectroscopy. The crystal structure was found to be single-phase cubic spinel with space group of Fd3m. The lattice constants of $CoCr_2O_4$ and $CoCrFeO_4$$a_0$ were determined to be 8.340 and 8.377 ${\AA}$, respectively. The ferrimagnetic transition temperature for the both samples were observed at 97 K and 320 K. The $M\"{o}ssbauer$ absorption spectra at 4.2 K show that the well developed two sextets are superposed with small difference of hyperfine field($H_{hf1}=507\;and\;H_{hf2}=492\;kOe$). Isomer shift values($\delta$) of the two sextets are found to be 0.33 and 0.34 mm/s relative to the Fe metal, respectively, which are consistent with the high spin $Fe^{3+}$ charge state.
Park, Jung Ae;Jin, Kyong-Suk;Kwon, Hyun Ju;Kim, Byung Woo
Journal of Life Science
/
v.25
no.3
/
pp.299-306
/
2015
Chrysanthemum zawadskii, a herbaceous perennial plant belonging to the Compositae, grows wild in Asian countries, including Japan, China, and Korea. The biological, antioxidative, anti-inflammatory, and antibacterial activities of C. zawadskii have been reported, its antiobesity activity has not been elucidated. In the present study, the effect of C. zawadskii methanol extract (CZME) on pancreatic lipase enzyme activity, adipocyte differentiation, and adipogenesis was investigated using an in vitro assay and a cell model system. CZME effectively suppressed lipase enzyme activity in a dose-dependent manner. CZME also inhibited insulin, dexamethasone, 3-isobutyl-1-methylxanthine (MDI)-induced adipocyte differentiation, lipid accumulation, and the level of triglyceride in 3T3-L1 preadipocytes in a dose-dependent manner, without cytotoxicity. The antiobesity effect of CZME might be modulated by gene and protein expression of cytidine-cytidine-adenosine-adenosine-thymidine (CCAAT)/enhancer binding proteins (C/EBP) α, C/EBPβ, and the peroxisome proliferator-activated receptor γ (PPAR γ). CZME also triggered lipolysis in a dose-dependent manner in MDI-induced 3T3-L1 preadipocytes. Taken together, these results provide important new insights into the antiobesity activities of C. zawadskii, showing that they involve pancreatic lipase inhibition, as well as antiadipogenic and lipolysis effects. CZME might be a promising source in the field of nutraceuticals. However, the active compounds that confer the antiobesity activities of CZME need to be identified.
Park, Jung Ae;Jin, Kyong-Suk;Kwon, Hyun Ju;Kim, Byung Woo
Microbiology and Biotechnology Letters
/
v.42
no.4
/
pp.354-360
/
2014
In this study, the anti-obesity activity of Smilax china methanol extract (SCME) was evaluated using a pancreatic lipase enzyme inhibition assay, and a cell culture model system. Results indicated that, SCME effectively inhibited pancreatic lipase enzyme activity in a dose-dependent manner. Furthermore, SCME significantly suppressed insulin, dexamethasone, 3-isobutyl-1-methylxanthine-induced adipocyte differentiation, lipid accumulation, and triglyceride contents on 3T3-L1 preadipocytes, in a dose-dependent manner. The anti-adipogenic effect was modulated by cytidine-cytidine-adenosine-adenosine-thymidine (CCAAT)/enhancer binding proteins (C/EBP) ${\alpha}$, $C/EBP{\beta}$, and the peroxisome proliferator-activated receptor ${\gamma}$ gene and protein expressions. Moreover, SCME triggered lipolysis effects dose-dependently on adipocyte. Taken together, these results provide an important new insight into SCME, indicating that it possesses anti-obesity activity through pancreatic lipase inhibition, anti-adipogenic and lipolysis effects. SCME may therefore be utilized as a promising source in the field of nutraceuticals. The identification of active compounds that confer the anti-obesity activities of SCME may be a logical next step.
Kim, Yong-Sik;Son, Young-Kyu;Khim, Jee-Hyung;Song, Ji-Hyeon
Journal of Korean Society of Environmental Engineers
/
v.27
no.5
/
pp.468-475
/
2005
Biofilters packed with various materials have emerged as a sustainable technology for the treatment of volatile organic compounds (VOCs); however, problems including low performance and clogging are commonly encountered. Recently, a bioactive foam reactor (BFR) using surfactants has been suggested to ensure efficient and stable VOCs removal performance. This study was mainly conducted to investigate the feasibility of BFRs using toluene as a model compound. Prior to bioreactor studies, a series of bottle tests were used to select a suitable surfactant for the BFR application. Experimental results of the batch bottle tests indicated that TritonX-100 was the most appropriate one among the surfactants tested, since it showed a minimal effect on the toluene biodegradation rate while the other surfactants lowered the toluene biodegradation rate significantly. Using the selected surfactant, the BFR performance was determined by changing operating parameters including gas residence time and toluene loading. As the gas residence time increased from 0.5 minutes to 2 minutes, the toluene removal efficiency increased from approximately 50% to 80%. In addition, an increase of the toluene loading from $38\;g/m^3/hr$ to $454\;g/m^3/hr$ resulted in a decrease of toluene removal efficiency from approximately 70% to 20%. The BFR had a maximum elimination capacity of $108\;g/m^3/hr$ for toluene, which was much higher than those generally reported in the literature. The high toluene-elimination performance indicates that the BFR be a potential alternative to the conventional, packed-type biofilters. However, the limitation of toluene solubilization and foam stability at either high or low gas flow rate are still problems to be challenged.
Park, Jung Ae;Jin, Kyong-Suk;Lee, Ji Young;Kwon, Hyun Ju;Kim, Byung Woo
Microbiology and Biotechnology Letters
/
v.42
no.3
/
pp.249-257
/
2014
In this study, the anti-oxidative and anti-obesity activities of Amomum cardamomum L. methanol extract (ACME) were evaluated using DPPH radical scavenging activity assay, pancreatic lipase enzyme inhibition assay, and the cell culture model system. ACME exhibited DPPH radical scavenging activities dose-dependently, with $IC_{50}$ of DPPH radical scavenging activities of ACME being $25.15{\mu}g/ml$. Furthermore, ACME effectively suppressed pancreatic lipase enzyme activity dose-dependently. ACME also significantly suppressed adipocyte differentiation, lipid accumulation, triglyceride (TG) contents, and triggered lipolysis activity on 3T3-L1 preadipocytes in a dose-dependent manner, without cytotoxicity. Their anti-obesity effect was modulated by the cytidine-cytidine-adenosine-adenosine-thymidine (CCAAT)/enhancer binding proteins ${\alpha}$ ($C/EBP{\alpha}$), $C/EBP{\beta}$ and the peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$) gene and protein expressions. Taken together, these results provide an important new insight that A. cardamomum L. possesses anti-oxidative and anti-obesity activities such as pancreatic lipase inhibition, anti-adipogenic, and lipolysis effects. There is therefore potential for its use as a promising component in the field of nutraceuticals and the identification of the active compounds that confer the anti-oxidative and anti-obesity activities of ACME might be an appropriate next step.
Journal of Korean Society of Environmental Engineers
/
v.31
no.2
/
pp.125-131
/
2009
Reductive dechlorination of polychlorinated dibenzo-p-dioxins (PCDDs) and its toxicity change were predicted by the linear free energy relationship (LFER) model to assess the zero-valent iron (ZVI) and anaerobic dechlorinating bacteria (ADB) as electron donors in PCDDs dechlorination. Reductive dechlorination of PCDDs involves 256 reactions linking 76 congeners with highly variable toxicities, so is challenging to assess the overall effect of this process on the environmental impact of PCDD contamination. The Gibbs free energies of PCDDs in aqueous solution were updated to density functional theory (DFT) calculation level from thermodynamic results of literatures. All of dechlorination kinetics of PCDDs was evaluated from the linear correlation between the experimental dechlorination kinetics of PCDDs and the calculated thermodynamics of PCDDs. As a result, it was predicted that over 100 years would be taken for the complete dechlorination of octachlorinated dibenzo-p-dioxin (OCDD) to non-chlorinated compound (dibenzo-p-dioxin, DD), and the toxic equivalent quantity (TEQ) of PCDDs could increase to 10 times larger from initial TEQ with the dechlorination process. The results imply that the single reductive dechlorination using ZVI or ADB is not suitable for the treatment strategy of PCDDs contaminated soil, sediment and fly ash. This LFER approach is applicable for the prediction of dechlorination process for organohalogen compounds and for the assessment of electron donating system for treatment strategies.
Journal of the Korean Society of Food Science and Nutrition
/
v.31
no.2
/
pp.204-210
/
2002
The quality characteristics and sensory evaluation of chungkookjang were investigated. The samples were prepared and fermented by the inoculation of Bacillus strains; B. subtilis, B. natto and B. licheniformis as a single starter, and mixed culture of B. natto and B. licheniformis on the industrialized model system. It was shown that microbial growth, protease activity, contents of amino-and ammonia-nitrogen and contents of organic acid were higher in B. subtilis inoculated sample, and were lower in B. licheniformis inoculated one. General quality characteristics of sample inoculated by mixed culture of B. natto and B. licheniformis took a middle position between each B. natto and B. licheniformis inoculated one. Fifty eight species of odor components were identified. Ethanol, 3-methyl-1-butanol, acetic acid, benzaldehyde and alkyl pyrazines were identified in all samples and most of other flavor components were strain specific. The contents of unpleasant smell components, alkyl pyrazines and benzaldehyde, were lower in B. licheniformis inoculated sample. The sensory evaluations showed that chungkookjang manufactured from mixed culture of B. natto and B.licheniformis was most acceptable. Therefore, results indicated that chungkookjang manufactured from mixed culture of B. natto and B. licheniformis induced better sensory quality than that of the control.
Hue Jin-Joo;Li Lan;Lyu Sul-Hye;Baek In-Jeoung;Yon Jung-Min;Nam Sang-Yoon;Yun Young Won;Hwang Seock-Yeon;Hong Jin Tae;Lee Beom Jun
YAKHAK HOEJI
/
v.49
no.6
/
pp.518-526
/
2005
Hwanggumgung (HGG) is a hair-care product which is composed of several plant extracts used in oriental medicine. This study was carried out to investigate effect of HGG on hair regrowth in a shaving model of C57BL6 mice. Five-week-old mice were acclimated for 1 week under 23$\pm$3$^{\circ}C$, 50$\pm10\%$ relative humidity and 12 h of a light/dark cycle before beginning experiment. There were four experimental groups including distilled water (D.W., control), 10$\%$ ethanol (EtOH, vehicle control), a positive control of 3$\%$ minoxidil (MXD), and HGG for female and male mice, respectively; Six-weeks old mice were trimmed by electric clippers so as not to damage the skin. The next day; mice without visible scraches were selected, randomized and separated in groups of 11 mice. The test compounds were topically treated with 0.15ml per mouse per day for 21 days. The hair regrowth was photographically and histologically determined during the experimental period of 21 days. Enzyme activities of $\gamma$-glutamyl transpeptidase and alkaline phosphatase were also determined using a rate assay method. There were no clinical signs in all experimental groups. The topical application of 3$\%$ MXD and HGG in female mice promoted hair regrowth earlier and faster than the control groups. In male mice, the topical application of 3$\%$ MXD and HGG also accelerated hair growth compared with the controls. Ten percent ethanol also promoted hair growth faster than D.W group. The histology of hair growth in experimental groups was strongly associated with the hair regrowth. 3$\%$ MXD and HGG promoted elongation of hair follicles compared with the controls in both female and male mice. Activities of alkaline phosphatase and $\gamma$-glutamyl transpeptidase, enzymes related to hair growth, significantly increased after treatments of 3$\%$ MXD and HGG for 2 weeks in both female and male mice (p < 0.05). These results suggest that HGG has hair growth promoting activities and it can be for treatment for alopecia.
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