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Streptomyces 속 KM-48 균주가 생성하는 Bacillus amyloliquefaciens 에 대한 항생물질
Lee, Sang-Man,Song, Bang-Ho 한국미생물 · 생명공학회 1983 한국미생물·생명공학회지 Vol.11 No.1
세포외 효소를 분필하는 Bacillus amyloliquefaciens의 생육을 선택적으로 저해하는 항생물질을 분리하고저 대구 근교의 토양시료 100여점을 채취하여 Streptomyces sp. KM-48주를 최종 선별하였다. 이 균주의 Nutrient Broth 배지에서의 배양00으로부터 활성성분을 acetone 유출, $Al_2$O$_3$, chromatography, avical TLC를 하여 UV 조사하에서 청록색 형광을 나타내는 단일물질로 정제하였다. 이 물질은 주로 그람양성균과 균모, 곰팡이 등에 강한 항균효과를 나타내었으며 Bacillus amyloliquefaciens에 대한 50% 생육저해농도가 18$\mu\textrm{g}$/$m\ell$이었다. 이 물질은 열에 비교적 약하였으며 산에는 강하게 그 활성이 유지되었다. 균주의 형태 및 배양성에서 Stretommces tsusimaensis의 유이균으로 동정되었다. One of Streptomyces sp. was screened as an antibiotic producing strain against Gram positive bacteria specifically from about one hundred Actinomycetes collections. The isolated KM-48 strain, indexed in our collection, was secreted an anbitiotic in nutrient broth culture. The active principle was extracted with acetone from the lyophilized solid of cultured filtrate. The nonadsorbed elute in aluminium oxide was isolated as a purified homogeneity which revealed a sing1e spot under ultra-violet beam on avicel thin layer chromatography. The isolated antibiotic was sensitive specifically against the Gram positive bacteria and fungi. About fifty percent inhibition of the control growth on Bacillus amyloliquefaciens was 18$\mu\textrm{g}$/$m\ell$. The antibiotic was lavile against thermotreatment and stabled in acidic condition remarkably. The KM-48 was identified as a similar strain to Streptomyces tsusimaensis on its morphological and cultural characteristics.
Ji-Hae Park,Do-Gyeong Lee,Seung-Woo Yeon,Hyuk-Sang Kwon,Jong-Hee Ko,Dong-Jin Shin,Han-Sol Park,Yong-Soon Kim,Myun-Ho Bang,NAM-IN BAEK 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.4
The silkworm (Bombyx mori L.) droppings were extracted with 80% aqueous MeOH, and the concentrated extract was partitioned in succession with EtOAc, n-BuOH, and H_2O. From the EtOAc fraction, five megastigmane sesquiterpenes were isolated through repeated silica gel and ODS column chromatography. According to the results of spectroscopic data, such as NMR, MS, and IR, the chemical structures of the isolated compounds were determined as (3S,5R,8R)-3,5-dihydroxymegastigma-6,7-dien-9-one (1), (S)-dehydrovomifoliol (2), (6R,7E,9R)-9-hydroxy-4,7-megastigmadien-3-one (3), (3S,5R,6S,7E)-3,5,6-trihydroxy-7-megastigmen-9-one (4), (6R,9R)-9-hydroxy-4-megastigmen-3-one (5). Compounds 2 through 5 were isolated for the first time from silkworm droppings. GC/MS analysis indicated silkworm powder contained compound 3, and mulberry leaves contained compound 4. Compounds 1 and 5 increased the expression of heme oxygenase-1 and SIRT1 in HepG2 and HEK239 cells, respectively. Heme oxygenase-1 is considered to be an antioxidant enzyme that catabolizes heme to carbon monoxide, free iron and biliverdin, while SIRT1 is the mammalian homologue of the yeast silent information regulator (Sir)-2, which are involved in the suppression of inflammatory mediators or factors that may be used to improve atopy-related symptoms.
( Sang Yu Oh ),( Bo Ryung Park ),( Byung Uk Lee ),( Jae Ho Park ),( Byung Gyu Kim ),( Seok Won Jung ),( In Du Jeong ),( Sung-jo Bang ),( Jung Woo Shin ),( Neung Hwa Park ),( Yun Im Lee ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Either entecavir (ETV) or tenofovir disoproxil fumarate (TDF) are recommended to use as the first-line nucleoside analogues (NAs) in patients with chronic hepatitis B (CHB) due to their potent viral suppression with a lower risk of drug resistance and excellent preventive effect for hepatocellular carcinoma (HCC) development. However, the effects of ETV and TDF on HCC development in CHB patients have not been fully examined. Methods: The aims of the current study were therefore to compare the effects of ETV and TDF therapy on HCC development in CHB patients in clinical practice. A total of 1,412 ETV-naïve patients and 1,318 TDF-naı¨ve patients were enrolled into the study. Results: The baseline characteristics of both groups were no significant difference. Virological and biochemical responses were similar between the two therapy groups over time. During a median 26 months of follow-up (range 1.0-60 months), 126 patients (4.6%) developed HCC. The 1-, 2-, 3- and 5-year cumulative HCC incidence rates in all cases were 2.2%, 3.8%, 5.1% and 9.9%, respectively. There was no significant difference in cumulative rates of HCC carcinoma (HCC) development (log-rank P = 0.357) between the two therapy groups. Multivariate analysis showed that male, older age, cirrhosis, lower albumin levels and HBeAg-positve status were independently associated with HCC development. Conclusions: HCC incidence and virological response were similar between ETV and TDF therapy groups in CHB patients in clinical practice. Therefore, either ETV or TDF are recommended to use as the first-line nucleoside analogues in patients with CHB due to their potent viral suppression and similar effect for HCC development.
Solar-powered multi-scale sensor node on Imote2 platform for hybrid SHM in cable-stayed bridge
Ho, Duc-Duy,Lee, Po-Young,Nguyen, Khac-Duy,Hong, Dong-Soo,Lee, So-Young,Kim, Jeong-Tae,Shin, Sung-Woo,Yun, Chung-Bang,Shinozuka, Masanobu Techno-Press 2012 Smart Structures and Systems, An International Jou Vol.9 No.2
In this paper, solar-powered, multi-scale, vibration-impedance sensor node on Imote2 platform is presented for hybrid structural health monitoring (SHM) in cable-stayed bridge. In order to achieve the objective, the following approaches are proposed. Firstly, vibration- and impedance-based hybrid SHM methods are briefly described. Secondly, the multi-scale vibration and impedance sensor node on Imote2-platform is presented on the design of hardware components and embedded software for vibration- and impedance-based SHM. In this approach, a solar-powered energy harvesting is implemented for autonomous operation of the smart sensor nodes. Finally, the feasibility and practicality of the smart sensor-based SHM system is evaluated on a full-scale cable-stayed bridge, Hwamyung Bridge in Korea. Successful level of wireless communication and solar-power supply for smart sensor nodes are verified. Also, vibration and impedance responses measured from the target bridge which experiences various weather conditions are examined for the robust long-term monitoring capability of the smart sensor system.
A Compact Cryocooling System With Subcooled Liquid Nitrogen for Small HTS Magnets
Ho-Myung Chang,Min-Jee Kim,Jung Wook Sim,Bang-Wook Lee,Il-Sung Oh IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>A compact cryogenic cooling system is developed for small HTS magnets to be continuously refrigerated in subcooled liquid nitrogen at temperatures below 77 K by a cryocooler. This thermal design is particularly useful when electrical insulation and compactness are significant at the same time. HTS elements are immersed in a cylindrical liquid-nitrogen vessel, and a copper band is brazed around the exterior sidewall of the cylinder at vertical location just under the liquid level in order to achieve peripherally uniform cooling with a GM cryocooler. The vapor space above liquid nitrogen in the vessel provides a fully open room for current leads and mechanical supports to the magnets. Heat is removed from the HTS magnets by natural convection of subcooled liquid nitrogen to the cold sidewall. The key components are designed based on heat transfer analysis. A prototype is fabricated, and it is successfully demonstrated that the thermal load is effectively removed and temperature is spatially uniform.</P>
Sung-Un Lee,Sang-Rok Lee,Joon-Hak Bang,Byeong-Ho Yoon,Jong-Hyun Lee 한국정보과학회 1999 Journal of Electrical Engineering and Information Vol.4 No.4
We present the architecture of an optical cross-connect (OXC) employing wavelength demultiplexers, optical switches, wavelength converters and wavelength multiplexers. It features expansibility. It has been shown that the proposed OXC can be implemented using commercial devices with lower insertion loss compared to the conventional OXC based on the delivery and coupling switch.
A Study on the Eclipse Estimation and Management of the COMS for On-station Operation
Sang-Cherl Lee,Koon-Ho Yang,Bong-Kyu Park,Bang-Yeop Kim 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
The COMS will be located at 128.2 deg East in geostationary orbit with three missions, one is a continuous monitoring of imagery and extracting of meteorological products, another is a monitoring of marine environments around Korean peninsular. The other is experimental telecommunication with Ka band payload. In space, especially geostationary orbit. various space circumstances, especially eclipse should be considered to operate the COMS in safety. The eclipse management which has two types of the Sun eclipse that causes a geostationary satellite to be in the shadow. The most common one is caused by the Earth blocking the sunlight and happens near equinoxes. The Earth caused eclipses can continue up to 45 days around equinox with the satellite being in the shadow up to 72 minutes each day. The eclipse estimation which is classified with the Sun eclipse by the Moon. the Sun eclipse by the Earth and the Moon eclipse by the Earth, are required for the purpose of the payloads and satellite operation. On station, two sub-system are concerned by the Sun eclipse, the one is AOCS because the Sun is used in normal mode for yaw estimation, the other is electrical power subsystem, because there is no more the Sun on the solar array to provide the power. We estimate entry and exit of eclipse of partial and total eclipse from geometrical relationship between the Sun, the Moon, the Earth and the COMS. This estimation is based on the stationkeeping simulation plan which will be done with 7 days period.