산란계 사료내 CLA 함유 Oil (CLAzen 80) 첨가가 난황내 지방산 조성에 미치는 영향

황보종,장종수,정일병,이병석,김동운,조성백,김희도,배해득,손진혁,홍의철,최낙진,Hwangbo J.,Chang J. S.,Chung I. B.,Lee B. S.,Kim D. U.,Cho S. B.,Kim H. D.,Bae H. D.,Son J. H.,Hong U. C.,Choi N. J. 한국가금학회 2005 韓國家禽學會誌 Vol.32 No.1

본 연구는 oil 형태의 conjugated linoleic acid(CLAzen 80)를 산란계 사료에 수준별로 첨가 급여하였을 때 산란율과 난황내 지방산 조성의 변화를 조사하기 위하여 수행하였다. 59주령의 산란계 72수를 완전임의배치법으로 4개 처리구에 6주간 공시하였다. 처리구는 CLAzen 80를 첨가하지 않은 대조구와 각각 1, 2 및 $3\%$를 첨가구를 두었다. 연구 결과를 살펴보면 산란율은 처리구별 통계적 유의차가 없었지만, 난황내 지방산 조성은 CLAzen 80 첨가에 의하게 크게 영향을 받았다. 난황내 C16:0과 C18:0과 같은 포화 지방산 함량은 CLAzen 80 첨가에 의하여 증가하였으나, 일가불포화지방산인 C18:1 함량은 오히려 감소하였다. 한편, 난황내 C18:2와 C18:3와 같은 다가불포화지방산은 CLAzen 80 급여 2$\~$4주사이에는 모든처리구들에 있어서 그 함량이 일정하게 유지되었다. 그러나, 대조구와 비교하여 CLAzen 80 급여 6주 째에는 난황내 C18:2 함량이 감소하였다. 불포화지방산:포화지방산 비율과 n-6:n-3 불포화지방산 비율은 2$\~$4주 사이에는 처리구별간에 통계적 유의차가 없었고, 6주째 불포화지방산:포화지방산 비율이 CLAzen 80 첨가에 의하여 감소하였다. 한편, 난황내 CLA 함량은 CLAzen 80 첨가수준에 비례하여 증가하였다. 따라서, 산란계 사료 내 CLAzen 80 첨가는 난황내 CLA 함량을 증진시키는 것으로 요약할 수 있다. The objectives of the present study were to investigate the effects of varying levels of dietary oil containing conjugated linoleic acid (CLA) on the egg production and fatty acid composition of egg yolk. Seventy-two 59-wk-old ISA Brown laying hens were randomly allotted to four dietary treatments, each consisting of three replicates with six birds per replicate. There were four treatments that consist of diets containing 0, 1, 2, or $3\%$ commercial CLA-containing oil. Egg production was not significantly different among the dietary treatments at 0, 2, 4, and 6 week. The proportion of saturated fatty acids such as C16:0 and C18:0 in egg yolk were increased, but that of monounsaturated fatty acid C18:1 was decreased by feeding CLA-containing oil supplementation. However, the proportion of polyunsaturated fatty acids such as C18:2 and C18:3 in egg yolk were not different among dietary treatments at 2 and 4 wk of the experiment. At 6 week, the proportion of C18:2 in egg yolk was decreased by feeding CLA-containing oil compared with the control. Polyunsaturated fatty acid:saturated fatty acid (P:S) ratio and n-6:n-3 polyunsaturated fatty acid ratio were similar across the treatments between 2 and 4 week. The P:S ratio was decreased by dietary CLA-containing oil supplementation at 6 week. The proportion of CLA in egg yolk was linearly increased with increasing levels of CLA-containing oil supplementation. In conclusion, dietary supplementation of CLA-containing oil to laying hens increased beneficially increased CLA content in their egg yolk.

食品에 있어서의 有毒性農藥의 殘留量測定硏究 (第10報)

宋哲,權佑昌,李興在,元敬豊,李哲遠,鄭英姬,盧晶培 國立保健硏究院 1977 국립보건연구원보 Vol.14 No.-

産業廢水와 河川汚染

鄭周雄 가톨릭대학산업의학센타 산업의학연구소 1965 韓國의 産業醫學 Vol.4 No.3

3차원 분자모형을 활용한 수업자료

이충길,이우붕,여환진,이광필,배준웅,이무상,여수동,정원우 慶北大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.-

The purpose of this study was to develop the PC program of learning aids by using three dimension molecular model for high school chemistry class. Specifically, this study developed instructional materials of molecular structure and crystall model using Virtual Reality modeling Language The developed program would be expected to be helpful for constructing image of molecular and crystal structure in high school students. Also, it may be useful for chemistry teachers who want to introduce molecular and crystal model into their classes.

일부 영세 도금사업장의 국소배기성능과 공기중 총크롬 , 6가 크롬 및 니켈농도와의 관계분석

박동욱,박두용,신용철,오세민,정규철 한국산업위생학회 1993 한국산업보건학회지 Vol.3 No.1

To evaluate efficiencies of the local exhaust systems installed in chromium and nickel electroplating tanks, specifications of each tank and general performances of the local exhaust systems were measured in 16 electroplating plants from July 3 to November 24, 1992. Airborne concentrations of total chromium, hexa-chromium and nickel were also measured. Most of the local exhaust systems installed in electroplating plants were inadequately designed. Average capture velocities of local exhaust systems in chromium and nickel tanks were 0.45 m/sec and 0.29 m/sec. Average slot velocities in chromium and nickel tanks were 7.30 m/sec and 2.87 m/sec respectively. Both average capture and slot velocities were in noncompliance with the standards recommended by American Conference of Governmental Industrial Hygienists (ACGIH) and National Institute for Occupational Safety and Health (NIOSH). Exhausted air volume was insufficient in all local exhaust systems surveyed. Worker exposure levels to total chromium, hexa-chromium and nickel were 43.0 ㎍/㎥, 1.7 ㎍/㎥ and 9.3 ㎍/㎥, which were below the Korean Standard and U.S. Occupational Health and Safety Administration (OHSA) Permissible Exposure Limit (PEL). However, Worker exposure level to hexa-chromium exceeded the NIOSH Recommended Exposure Limit(REL) of 1 ㎍/㎥. As the result of Scheffee's multiple comparions, worker exposure levels to all metals were significantly different between two groups by the management state of existing local exhaust systems (p$lt;0.05). However, Difference between a group with local exhaust systems which were poorly managed and another group without local exhaust system was satatistically non-significant.

한국인 십이지장궤양 환자에 있어서 Omeprazole(로섹^(�))의 치료효과

박경남,윤종만,정준모,양웅석,민영일,선희식,이상인 최신의학사 1989 最新醫學 Vol.32 No.2

공간자료와 지면모형을 이용한 면적증발산 추정

윤진일,남재철,홍석영,김준,김광수,정유란,채남이,최태진 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.3

Evapotranspiration (ET) is a critical component of the hydrologic cycle which influences economic activities as well as the natural ecosystem. While there have been numerous studies on ET estimation for homogeneous areas using point measurements of meteorological variables, monitoring of spatial ET has not been possible at landscape - or watershed - scales. We propose a site-specific application of the land surface model, which is enabled by spatially interpolated input data at the desired resolution. Gyunggi Province of South Korea was divided into a regular grid of 10 million cells with 30m spacing and hourly temperature, humidity, wind, precipitation and solar irradiance were estimated for each grid cell by spatial interpolation of synoptic weather data. Topoclimatology models were used to accommodate effects of topography in a spatial interpolation procedure, including cold air drainage on nocturnal temperature and solar irradiance on daytime temperature. Satellite remote sensing data were used to classify the vegetation type of each grid cell, and corresponding spatial attributes including soil texture, canopy structure, and phenological features were identified. All data were fed into a standalone version of SiB2(Simple Biosphere Modell) to simulate latent heat flux at each grid cell. A computer program was written for data management in the cell - based SiB2 operation such as extracting input data for SiB2 from grid matrices and recombining the output data back to the grid format. ET estimates at selected grid cells were validated against the actual measurement of latent heat fluxes by eddy covariance measurement. We applied this system to obtain the spatial ET of the study area on a continuous basis for the 2001-2003 period. The results showed a strong feasibility of using spatial - data driven land surface models for operational monitoring of regional ET.

탄소나노튜브 캐소드에서 본딩재료가 전계강화와 전계방출 특성에 미치는 영향

신허영,김동희,안병건,최우석,정원섭,정우창,조영래 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6

Carbon nanotube cathodes with a high current density were investigated for use in flat panel displays. The field emission properties of cathodes fabricated by a screen-printing process were characterized in a high-vacuum chamber in the diode mode. The change in composition of the bonding materials comprise of a glass-frit and an Agpaste greatly affected the sheet resistance of the films after a heat treatment at 350℃. A higher volume fraction of insulating glass-frit in the bonding materials resulted in a larger value for the sheet resistance. However, the electric field enhancement factor(β) in the Fowler-Nordheim equation was not greatly affected by the composition changes of the bonding materials. Compared with the field enhancement factor, the current density was increased much more. Based on these findings, we conclude that the higher value of the current density was due to both an increased field enhancement factor and an increased number of carbon nanotubes protruding from the film surface. (Received May 10, 2004)

Amelioration of obesity in high-fat diet-fed mice by chestnut starch modified by amylosucrase from Deinococcus geothermalis

Lee, E.S.,Lee, B.H.,Shin, D.U.,Lim, M.Y.,Chung, W.H.,Park, C.S.,Baik, M.Y.,Nam, Y.D.,Seo, D.H. IRL Press ; Elsevier Science Ltd 2018 Food hydrocolloids Vol.75 No.-

The ameliorative effect of enzymatically modified chestnut starch on high-fat diet (HFD)-induced obesity in a mouse model and the underlying mechanism were investigated. Chestnut starch was enzymatically modified by amylosucrase from Deinococcus geothermalis (DGAS). In vitro analyses including Englyst's assay and determination of the starch digestive pattern to investigate starch digestibility revealed that chestnut starch naturally contained higher slowly digestible starch and resistant starch than corn starch. Modification of chestnut native starch by DGAS increased the proportion of resistant starch, rendering it unavailable for catalysis by small-intestinal mucosal α-glucosidase. The amylose ratio and branch-chain of amylopectin in chestnut starch were increased by DGAS. In an in vivo study, HFD (45% kcal from fat)-induced obese C57BL/6 model mice were orally administered DGAS-modified chestnut starch at the dose of 1500 mg/kg b.w for 10 weeks. Supplementation of DGAS-modified chestnut starch to obese mice significantly reduced features of obesity as compared with HFD- or native chestnut starch-fed mice. Food intake and the gut hormones PYY and GLP-1 were not significantly changed. However, we found that feeding DGAS-modified chestnut starch led to a significant increase in empty cecum weight, indicating short-chain fatty acid production in the cecum. Additionally, DGAS-modified chestnut starch induced the short-chain fatty acid receptor GPR43-mediated suppression of insulin signaling. Changes in all these factors were resistant starch content-dependent. In conclusion, DGAS modification of chestnut starch increases non-digestible resistant starch and this ameliorates diet-induced obesity via GPR43-mediated suppression of insulin signaling, thereby presumably reducing fat accumulation in white adipose tissue.

High Temperature Application of Iron Removal Chemical Cleaning Solvent in the Secondary Side of Nuclear Steam Generators

허도행,이은희,정한섭,김우철,Hur, D.H.,Lee, E.H.,Chung, H.S.,Kim, U.C. Korean Nuclear Society 1994 Nuclear Engineering and Technology Vol.26 No.1

원전 증기발생기 2차측 제철 화학세정을 기존의 93$^{\circ}C$ 표준공정보다 고온인 1$25^{\circ}C$에서 검증시험을 수행하였다. 원전 증기발생기를 1$25^{\circ}C$에서 화학 세정한다는 가정아래 현장세정 조건을 결정하고 이를 다시 모사하여 3l 용량의 소형 검증시험 조건을 결정하였다. 1 gallon 용량의 316 스텐레스강 압력용기를 반응용기로 사용하는 화학세정 시험장치에서 검증시험을 수행하여 스러지 용해거동, 모재 부식률, 세정제 화학조성 변화거동 등을 측정하였다. 1$25^{\circ}C$ 검증시험 결과에서 93$^{\circ}C$ 표준공정보다 세정시간을 절반이하로 단축시키고도 더 효율적인 세정효과를 얻을 수 있을 뿐만이 아니라 2차측 모재의 부식률도 감소함을 확인할 수 있었다. 그러나 고온 세정공정은 아직 현장적용 경험이 없고, 별도의 외부순환 세정 장치를 이용하는 93$^{\circ}C$ 표준공정과는 달리 주냉각재의 잠열로 2차측을 가열하므로 세정이 완료될 때까지 주냉각 펌프를 계속 가동하여야 하는 단점이 있다. 가동중인 증기발생기에 대한 화학세정을 수행할 때 93$^{\circ}C$ 표준공정과 고온공정의 장 단점을 신중히 검토하여 최적공정을 적용하여야 할 것이다. A qualification test was performed for the iron removal chemical cleaning of the secondary side of nuclear steam generators at the selected temperature, 1$25^{\circ}C$, higher than the standard application temperature, 93$^{\circ}C$. The field cleaning condition for a nuclear unit was tested in a bench scale test loop including a SUS 316 stainless steel autoclave with one gallon capacity as a test vessel. The kinetics of sludge dissolution, corrosion of the secondary side materials and change of solvent chemistry were monitored. Test results indicated that more thorough cleaning was accomplished in less than half of the cleaning time required at 93$^{\circ}C$. And the total corrosions of the secondary side materials were found to be less than the values at 93$^{\circ}C$. While the solvent is recirculated and heated by an external chemical cleaning equipment for the conventional 93$^{\circ}C$ process, the secondary side is heated by the lateral heat of the primary coolant without the recirculation of the cleaning solution, and the solvent is mixed by vigorous boiling induced by periodic ventilation for the high temperature process. The requirement that the reactor coolant pumps should be running during the cleaning operation is the major disadvantage of the high temperature process which also should be considered when chemical cleaning is planned for steam generators under operation.