• Mycobiology
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• 제44권1호
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• pp.14-20
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• 2016

A new species and 2 new records of lichen genus Buellia were discovered from Chuja-do Island in Jeju Province during a recent floristic survey: B. chujana X. Y. Wang, S. Y. Kondr., L. $L\ddot{o}k\ddot{o}s$ & J.-S. Hur sp. nov., B. halonia (Ach.) Tuck., and B. mamillana (Tuck.) W. A. Weber. The new species is characterized by a brown, areolate thallus, the presence of perlatolic acid, and a saxicolous habitat. Together with previously recorded species, 10 Buellia species were confirmed from Jeju-do Island. Among these species, 3 growing in the exposed rocky area contained xanthone (yellowish lichen thallus, UV + orange), indicating that production of xanthone in this genus might be a defense strategy against the harm of UV light. Although the genus Buellia has been thoroughly studied in Korea before, novel species have been discovered continuously, and large species diversity has been found in this crustose genus, even from a small rocky island. This study indicates that the coastal area harbors a vast number of crustose lichen species, and there is great potential to discover unknown lichens in the coastal rocky area in Korea.

• Nuclear Engineering and Technology
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• 제51권5호
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• pp.1444-1450
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• 2019

The fast-neutron shielding behaviour (FNSB) of two clay-materials (Ball clay and Kaolin)of Southwestern Nigeria ($7.49^{\circ}N$, $4.55^{\circ}E$) have been investigated using effective removal cross section, ${\Sigma}_R(cm^{-1})$, mass removal cross section, ${\Sigma}_{R/{\rho}}(cm^2g^{-1})$ and Mean free path, ${\lambda}$ (cm). These parameters decide neutron shielding behaviour of any material. A computer program - WinNC-Toolkit has been used for computation of these parameters. The toolkit evaluates these parameters by using elemental compositions and densities of samples. The proficiency of WinNC-Toolkit code was probe by using MCNPX and GEANT4 to model fast neutron transmission of the samples under narrow beam geometry, intending to represent the actual experimental setup. Direct calculation of effective removal cross section ($cm^{-1}$) of the samples was also carried out. The results from each of the methods for each types of the studied clay-materials (Ball clay and Kaolin) shows similar trend. The trend might be the fingerprint of water content retained in each of the samples being baked at different temperature. The compositions of each sample have been obtained by Particle-Induced X-ray Emission (PIXE) technique (Tandem Pelletron Accelerator: 1.7 MV, Model 5SDH). The FNSB of the selected clay-materials have been compared with standard concrete. The cognizance of various factors such as availability, thermo-chemical stability and water retaining ability by the clay-samples can be analyzed for efficacy of the material for their FNSB.

• 한국생활과학회지
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• 제17권2호
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• pp.305-313
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• 2008

This subject investigated visual evaluation of preference and fitness level of set-in sleeve in sleeve types(form)and studied suitable sleeve type at silhouette and targeted female students in twenties. The results of study were as follows: 1. Visual evaluation factors in set-in sleeve of sleeve types were selected 6 factors; the 1st factor is decorativeness, the 2nd factor is attractiveness, the 3rd factor was activeness, the 4th factor was feminine, the 5th factor was charming and 6th factor was a figural element. Decorativeness and attractiveness factors in visual evaluation of sleeve types were the most important level. 2. The visual evaluation differences of sleeve types in set-in sleeve were as follows; in the 1st factor, S and P2 were the most decorative sleeve type. in the 2nd factor, S, P2 and P3 are the most attractive sleeve type. in the 3rd factor, B and P3 were the most active sleeve type. in the 4th factor, L was the most feminine sleeve type. in the 5th factor, P1, L and P3 were charming sleeve type. in the 6th factor, P3 was evaluated that it shows narrowened shoulder sleeve types. 3. The analysis result of preference and wearing level in each sleeve types were as follows. 20's female university students like to wear S, P1, P2 and P3 sleeve types and the most favorite sleeve types are S, P2 and P3. 4. The analysis result of silhouette set-in sleeve in sleeve types; S, B and P2 in H-type silhouette, P2, S and P1 in A-type silhouette, B and P3 in O-type silhouette, L and P3 in X-types silhouette were show the most suitable sleeve types.

• Progress in Superconductivity
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• 제3권2호
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• pp.135-139
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• 2002

We have fabricated high-quality c-axis-oriented $MgB_2$ thin films by using a pulsed laser deposition technique. The thin films grown on (1 1 0 2) $Al_2$$O_3$ substrates show an onset transition temperature of 39.2 K with a sharp transition width of ~0.15 K. X-ray diffraction patterns indicate a c-axis-oriented crystal structure perpendicular to the substrate surface. We observed high critical current densities ($J_{c}$) of ~ 16 $MA/\textrm{cm}^2$ at 15 K and under self-field, which is comparable to or exceeds those of cuprate high-temperature superconductors. The extrapolation $J_{c}$ at 5 K was estimated to be ~ 40 MA/$\textrm{cm}^2$, which is the highest record for $MgB_2$ compounds. At a magnetic field of 5 T, the $J_{c}$ of~ 0.1 $MA/\textrm{cm}^2$ was detected at 15 K, suggesting that this compound is very promising candidate for the practical applications at high temperature with lower power consumption. As a possible explanation for the high current-carving capability, the vortex-glass phase will be discussed.d.d.d.

• Bulletin of the Korean Chemical Society
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• 제33권7호
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• pp.2325-2332
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• 2012

A series $[C_3Omim]$[X] of imidazolium cation-based ILs, with ether functional group on the alkyl side-chain have been synthesized and structure of the materials were confirmed by various techniques like $^1H$, $^{13}C$ NMR spectroscopy, MS-ESI, FTIR spectroscopy and EA. More specifically, the influence of changing the anion with same cation is carried out. The absorption capacity of $CO_2$ for ILs were evaluated at 30 and $50^{\circ}C$ at ambient pressure (0-1.6 bar). Ether functionalized ILs shows significantly high absorption capacity for $CO_2$. In general, the $CO_2$ absorption capacity of ILs increased with a rise in pressure and decreased when temperature was raised. The obtained results showed that absorption capacity reached about 0.9 mol $CO_2$ per mol of IL at $30^{\circ}C$. The most probable mechanism of interaction of $CO_2$ with ILs were investigated using FTIR spectroscopy, $^{13}C$ NMR spectroscopy and result shows that the absorption of $CO_2$ in ether functionalized ILs is a chemical process. The $CO_2$ absorption results and detailed study indicates the predominance of 1:1 mechanism, where the $CO_2$ reacts with one IL to form a carbamic acid. The $CO_2$ absorption capacity of ILs for different anions follows the trend: $BF_4$ < DCA < $PF_6$ < TfO < $Tf_2N$. Moreover, the as-synthesized ILs is selective, thermally stable, long life operational and can be recycled at a temperature of $70^{\circ}C$ or under vacuum and can be used repeatedly.

• 한국초지조사료학회지
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• 제29권4호
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• pp.337-344
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• 2009

본 연구에서는 논에서의 조사료 생산을 위한 작부형태별 우분액비의 시용효과를 규명하기 위하여 총체보리+수수$\times$수단그라스 교잡종 이모작구 그리고 헤어리베치를 녹비작물로 이용한후 수수$\times$수단그라스 교잡종 일모작구로 하여 논에서의 다양한 조사료 작부 형태를 배치하고, 수수$\times$수단그라스 교잡종의 생산성 및 사료가치를 조사하였다. 그리고 처리구별 토양의 지력증진 효과를 분석함과 동시에 우분액비의 시용과 경작형태에 따른 용탈수중 $NO_3$-N, $NH_4$-N 및 $PO_4$-P 등을 분석하여 환경오염에 미치는 영향을 조사하였다. 본 연구는 수수$\times$수단 그라스 교잡종의 생산성과 환경에 미치는 영향을 평가하고자 2006년 5월부터 2009년 4월 까지 3년 동안 전라북도 김제군 백산면 시험포장에서 완전임의배치 3반복으로 수행되었다. 수수$\times$수단그라스 교잡종은 총체보리와 이모작의 경우가 헤어리베치를 이용한 일모작에 비해 수량이 현저하게 증가하였다(P<0.05). 그리고 수수$\times$수단그라스 교잡종의 조단백질, NDF, ADF 및 TDN 함량은 처리구간에 큰 차이는 나타나지 않았다. 총체보리와 이모작구에서의 OM, T-N 및 $P_2O_5$ 함량은 녹비작물로 이용된 일모작구에 비해 높았다. 그리고 우분액비시용에 따른 토양 내 pH와 OM 농도는 시험전에 비해 시험종료 후에 현저하게 증가하는 경향을 나타냈다. 또한 이모작구와 일모작구에서 T-N 함량은 시험전에 비해 시험종료 후에 현저하게 증가하는 경향을 나타냈다(P<0.05). 경작형태별 우분액비 시용에 따른 토양내 양이온치환용량 ($Ca^{2+}$, K, Mg 및 Na) 농도는 시험 전에 비해 시험종료 후에 현저하게 증가하는 경향을 나타냈다(P<0.05). 또한 경작형태별 우분액비 시용에 따른 용탈수중 $NO_3$-N, $NH_4$-N 및 $PO_3$-P의 농도는 경작형태에 따른 확실한 차이를 보여주지 않았다.

• 한국미생물·생명공학회지
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• 제28권3호
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• pp.167-171
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• 2000

두엄에서 분리한 Thermoactinomycese sp. E79는 탈지 대두박(defatted soycean meal)을 특이적이로 분해하는 내열성 alkaline 단백질 분해효소를 생산한다. 이 효소를 생산하기 위한 환경인자를 조사하였는데 배지의 초기 pH가 6에서 8까지는 유사한 균체농도를 얻을 수 있었고 pH10에서는 단백질분해효소의 발현이 되지 않았다. 탄소원은 수용성 전분을 이용할 경우 최적의 값을 보여 9.2U/mL의 효소역가를 얻었고 포도당을 탄소원으로 사용한 경우 단백질분해효소의 발현이 억제되었다 최적의 효소발현을 위해 tryptone을 세포성장에 soytone을 단백질 분해효소 생산에 가장 적합한 질소원으로 선택하였다. 호기성 세균인 Thermoactinomycese sp. E79의 산소요구성으 알아보기 위해 산소전달속도를 달리하여 발효인자를 결정하였고 volumetric oxygen transfer coefficient 가 1.93$\times$102 hr-1 일 때 균체농도 6.58 g/L 효소역자 43.0 U/mL 의최대값을 보였다 또한 효소역가를 증강시키기 위해 200mg/L의 humic acid를 첨가한 경우 비첨가 대조구에 비해 단백질 분해효소 역가는 1.64배 세포성장은 1.77배 증가하였다.

• 대한화장품학회지
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• 제39권4호
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• pp.271-279
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• 2013

립스틱의 보습력을 개선하기 위해 수용성 콜라겐(30 wt%)을 역미셀 방법으로 립스틱의 유상 내에 포접하였다. 콜라겐을 포함하는 역미셀은 외부상으로서 caprylic/capric triglyceride와 계면활성제인 polyoxyethylene(10) octylphenyl ether (Triton X-100)와 보조계면활성제로 aliphatic alcohol인 1-dodecanol을 이용하여 제조되었다. 콜라겐을 포접하는 역미셀의 형성 조건은 전기전도도와 methylene blue (MB)를 이용한 UV-vis spectrum을 통해 확인하였고, 콜라겐 포접체를 함유하는 역미셀의 립스틱에서 안정성 및 보습력은 레올로지 측정, 수분량 측정 및 아미노산 정량을 통해 확인하였다. 물과 계면활성제의 농도비인 W (water-pool), [$H_2O$]/[Triton X-100]는 10이하에서 안정한 역미셀이 형성되었다. 20 wt%의 콜라겐 포접 역미셀을 함유한 립스틱은 역미셀을 함유하지 않은 립스틱과 경도에서 큰 차이없이 안정하였으며, 수분량은 59%까지 개선되었고, 아미노산 함량은 92.7%였다.

• Natural Product Sciences
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• 제26권3호
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• pp.207-213
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• 2020

Characterization and in vitro inhibition studies of protease inhibitor from the mushroom Pleurotus floridanus (PfTI) towards the pest Papilio demoleus is studied. The addition of 1 mM Mn²⁺, Na²⁺, Ba²⁺ and Ni ²⁺ enhanced the PfTI activity. The ICP-atomic emission spectrum showed the presence of Ca²⁺, Mg²⁺ and Zn²⁺ in the PfTI. Surfactants SDS and CTAB at a concentration of 1% reduced the PfTI activity whereas, the nonionic detergents Triton X and Tween 80 increased the activity. The inhibitory activity gradually decreased with increase in concentration of DMSO and H₂O₂. The activity was increased by dithiothreitol up to a concentration of 80 μM and inactivated at 140 μM. The activity of PMSF modified PfTI was drastically reduced to 0.234 U/mL at 4 mM concentration and similar results were obtained for modification of cysteine by N-Ethylmaleimide at slightly higher concentrations. The complex of trypsin and PfTI showed complete loss in fluorescence intensity at 343 nm compared with control. In vitro inhibition studies of PfTI with midgut proteases isolated from citrus pest P. demoleus with protease activity of 1.236 U was decreased to 0.613 U by 50 μL (0.1 mg/mL) of the inhibitor. Inhibitor was stable up to 0.04 M concentration of HCl.

• 한국식품과학회지
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• 제29권1호
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• pp.161-166
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• 1997

식용버섯류를 대상으로 혈액응고계를 활성화시키는데 주된 역할을 하는 것으로 알려진 단백질인 tissue factor에 대한 저해활성을 시험관내에서 측정하였으며 몇 가지 유기용매를 이용하여 추출분획을 조제하고 이들의 TF에 대한 저해활성을 비교 검색하여 다음과 같은 결과를 얻었다. 검색된 버섯류의 메탄올 추출물들은 모두 TF에 대한 저해활성을 나타내었으며 특히 표고버섯은 비교적 강한 저해활성을 나타내었고 양송이버섯과 영지버섯 역시 TF 저해활성을 갖는 것으로 나타났다. 양송이버섯의 메탄올 추출물의 $IC_{50}$은 in vitro에서 $1.30\;{\mu}g$이었고 영지버섯은 $4.32\;{\mu}g$, 표고버섯은 $0.25\;{\mu}g$으로 각각 조사되었다. 유기용매를 이용하여 용매분획을 실시하고 각 용매분획의 TF 저해활성을 측정한 결과 표고버섯의 에틸아세테이트 분획에서 강한 TF 저해활성이 확인되었고 영지버섯의 에틸아세테이트 분획에서도 TF에 대한 저해활성이 나타났으며 표고버섯의 에틸아세테이트 분획에서 얻은 결정성 물질 역시 TF를 저해하는 활성을 나타내었다. 모든 버섯의 물층에서는 활성이 확인되지 않았으며 영지버섯의 에틸아세테이트 분획의 $IC_{50}$은 $107\;{\mu}g$, 표고버섯의 경우 $770\;{\mu}g$의 값을 나타냈고 표고버섯의 에틸아세테이트 분획으로부터 얻은 결정성물질의 $IC_{50}$은 10.2 mg이었다.