다른 광물질과 혼합된 크롬 피콜린산 급여가 비육돈의 성장 , 도체특성 , 혈액성상에 미치는 영향

김지훈,한인규,김진동,김대성,양종석,손현수,현영 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.5

본 시험은 여러 가지 광물질과 혼합된 크롬 피콜린 산을 첨가한 사료의 급여가 비육돈의 성장, 도체특성, 혈액성상에 미치는 영향을 알아보기 위하여 수행되었다. 개시체중이 69㎏인 총 513두의 비육돈을 돈방당 16∼21두씩 수용하여 사양시험을 수행하였으며, 9마리가 대사시험에 사용되었다. 처리구는 2개의 단백질 수준별 대조구 (Con 12, Cen 14)와 외산 크롬 피콜린산 (CrP-CaCO₃ ; Prince사 제품). 크롬 제오라이트 (CrP-Zeolite 12, 14), 국산 크롬 피콜린산 1 (CrP-CaCO₃; KIST 개발), 크롬 피콜린산-산화아연 (CrP-CaCO₃-ZnO 12, 14) 그리고 국산 크롬 피콜린산 2 (CrP-CaCO₃ ; M. H. Lee 개발)이었다. 성장성적에 있어서는 일당중체량, 일당사료섭취량, 사료효율 등 모든 조사항목에서 처리구간의 차이가 발견되지 않았으나, 등지방 두께는 크롬 피콜린산 첨가에 의해 감소하는 경향이 발견되었고, 이러한 경향은 출하체중이 무거울수륵 뚜렷하게 나타났다. 도체등급은 크롬 제오라이트구와 크롬 피콜린산-산화아연처리구에서 높게 나타났으며, 혈액내 콜레스테를의 함량도 크롬 제오라이트구와 크롬 피콜린산-산화아연처리구에서 대조구에 비해 유의적으로 감소하였다 (p<0.05). 크롬 피콜린산-산화아연처리구와 크롬 피콜린산구에서 건물 및 단백질 소화율이 향상되었다 (p<0.05). This experiment was conducted to investigate the effects of chromium picolinate in different combinations with minerals on growth, carcass characteristics, serum traits and nutrient digestibility in finishing pigs. Five-hundred and thirteen pigs (69.0 ㎏ of initial weight) were assigned to 9 treatments, each containing three replicates of sixteen to twenty-one pigs each. Additional nine pigs were used in a digestion trial. Treatments were two controls (12% CP and 14% CP), foreign CrP-CaCO₃, two CrP-Zeolite (12% CP and 14% CP), domestic CrP-CaCO₃ 1, CrP-CaCO₃-ZnO (12% CP and 14% CP) and domestic CrP-CaCO₃ 2. ADG was not significantly different among the treatments. Tenth rib backfat thickness tended to be decreased by feeding diet with CrP. Carcass grade was improved by using zeolite and CaCO₃ + ZnO along with CrP in diets. Serum cholesterol level was significantly reduced by feeding diets containing CrP with CaCO₃ + ZnO or Zeolite compared with the control. Supplementation of Cr with CrP-CaCO₃ + ZnO or CrP-CaCO₃ in diets significantly improved the digestibility of crude protein and dry matter (p<0.05). The excretion of nitrogen was lower in pigs fed diets containing Cr regardless of the combinations with minerals. The excretion of phosphorus was lowest in the CrP-CaCO₃ + ZnO group which showed the highest phosphorus digestibility.

플라즈마질화 및 침질탄화처리한 탄소강의 경도와 내마모특성

정병호,이재식,김무길,박화순,이병찬,신성하 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.2

Commercial carbon steels containing 0.2∼0.55wt.%C were plasma-nitrided or plasma nitrocarburized at 550℃ for 21.6Ks using H₂-N₂or H₂-N₂-CO mixed gas respectively. The characteristics of hardening and wear-resistance of each treatment were studied and compared. And also microstructure of nitrided layer and nitrides formed in compound layer near surface were studied. All plasma-nitrided steels investigated showed remarkable increase of surface hardness with the increase of carbon content. But nitrocarburized steels resulted in higher surface-hardness than plasma-nitrided steels, which means that nitrocarburized has higher surface-hardening effect. Plasma-nitrided steels showed hardness increase in through-thickness direction near surface. And also nitrocarburized steels showed similar hardness distribution in through-thickness direction to that of plasma-nitrided steel. However, nitrocarburized steels had higher cross-sectional maximum-hardness than plasma-nitrided steels as much as 100Hv. Wear test showed that the amount of specific wear was reduced by both plasma-nitriding and nitrocarburized, showing that the amount of specific wear was not related to the hardness. But non-treated specimen showed that the amount of specific wear was related to the hardness.

HLA 항원이 동일한 자매에서 병발한 IgA 신병증

엄재호,한진석,이정상,김용일,김성권,이현순,김근호 대한신장학회 1989 Kidney Research and Clinical Practice Vol.8 No.3

This report described HLA identical sisters with IgA nephropathy, and it is the first case with HLA identical IgA nephropathy in Korea. The elder sister had frequent episodes of gross hematuria associated with upper respiratory tract infection, and younger sister had one episode of gross hematuria only. The renal biopsies revealed diffuse mesangial deposition of IgA, accompanied by lesser amount of C3 in immunofluorescent microscopy. Light and electron microscopic findings were compatible with IgA nephropathy. The HLA antigens were identical, which were All Aw24, B27 Bw35, Cwl Cw4, These findings are interesting in view of the association of IgA nephropathy with HLA-Bw35 antigen. Asike piror reports of HLA identical brothers with IgA nephropathy.

RTCVD 법으로 성장한 Si1-xGex 에피막의 특성

김광일,배영호,강봉구,정욱진,군영규,손병기 한국센서학회 1996 센서학회지 Vol.5 No.2

The growth and characterization of heteroepitaxial Si_(l-x)Ge_x films grown by the RTCVD (Rapid Thermal Chemical Vapor Deposition) method were described. For the growth of Si_(l-x)Ge_x heteroepitaxial layers, SiH₄/ GeH₄ / H₂ gas mixtures were used. The growth conditions were varied to investigate their effects on the Si / Ge composition ratios, the interface abruptness and crystalline properties. The experimental data shows that the misfit threading dislocation in Si_(l-x)Ge_x / Si heteroepitaxial film of about 400 A thickness was not observed at the growth temperature of as low as 650℃, and the composition ratios of Si / Ge changed linearly with SiH₄ / GeH₄ gas mixing ratios in our experimental ranges. In the in-situ boron doping experiments, the doping abruptness would be controlled within several hundreds Å/decade.

RTCVD 법으로 성장한 실리콘 에피막의 특성

김광일,손병기,정욱진,권영규,배영호,강봉구 한국센서학회 1996 센서학회지 Vol.5 No.1

Silicon epitaxial films of submicron level were successfully grown by the RTCVD method. For the growth of silicon epitaxial layers, SiH₂Cl₂/ H₂ gas mixtures and various process parameters including Hz prebake process were used. The growth conditions were varied to investigate their effects on the interface abruptness of doping profile, the film growth rates and crystalline properties. The crystallinity of the undoped silicon was excellent at the growth temperature of 900℃. The doping profiles were measured by SIMS technique. The abruptness of doping profile would be controlled within about 200A /decade in the structure of undoped Si / n^+ -Si substrate.

MgO 와 NH4Cl 의 반응을 이용한 Mg 성분추출 및 암모니아의 회수

김원배,유영홍,이건직 고려대학교 공학기술연구소 1990 고려대학교 생산기술연구소 생기연논문집 Vol.26 No.1

Reaction of MgO with NH₄Cl was investigated in order to find the fundamental data for a new extraction process of magnesium component from MgO and to recover NH₃(g) from NH₄Cl Reaction mechanisms of MgO with NH₄Cl were as follows: Reaction temperature; 225℃ - 250℃ i) MgO + 3NH₄Cl ― NH₄MgCl₃ + H₂O + 2NH₃ Reaction temperature; over 300℃ ii) 2MgO+NH₄Cl+H₂O ― Mg₂(OH)₃Cl+NH₃ iii) Mg₂(OH)₃Cl+NH₄MgCl₃ ― 3MgOHCl+NH₄Cl iv) MgO+NH₄Cl ― MgOHCl+NH₃ v) MgOHCl+NH₄Cl ― MgCl₂+NH₃+H₂O vi) MgO+2NH₄Cl ― MgCl₂+2NH₃+H₂O The optimum conditions of extraction of magnesium were as follows: Reaction time 15 min Reaction temperature 350℃ Mole ratio of NH₄Cl to MgO 4.0 N₂ gas flow rate 30 ㎤/min Under these conditions, the extraction of magnesium was 99.99% and the recovery of NH₃(g) was 81.69%. For the recovery of NH₃ Reaction time 1h Reaction temperature 400℃ Mole ratio of NH₄Cl to MgO 4.0 N₂ gas flow rate 30 ㎤min Under these conditions, the recovery of NH₃ was 93.33%.

점착 ACF 를 이용한 염기성 악취물질의 제거

김기환,김덕기,최봉각,신창섭 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1

Malodorous gases give discomfort and harm to laborers and residential neighborhoods and therefore, the removing odor materials emitted from plants and industrial facilities is important subject. The main ingredients of alkali odor are NH₃ and CH₃SH. The adsorption characteristics of odors were studied using four different activated carbon fibers(ACF) and active carbon(AC). Alkali odor was removed by using ACF impregnated with H₃PO₄ and H₂SO₄ and treated with HNO₃ and NaOH. The experimental result showed that ACF has a higher removal efficiency than AC. The adsorption capacity was increased with the impregnation and surface treatment, and H₂SO₄ was the best impregnant for the removal of alkali odor.

Dodeyl diamino thyi glycin hydrochloride(Hygien 51)의 각종항산균에 대한 항균작용에 관한 시험관내 실험

황청자,진재신,김주덕,오흥근 대한마취과학회 1970 Korean Journal of Anesthesiology Vol.3 No.1

In order to prevent cross-infection, the sterilization of used and/or contaminated anesthetic- apparatus is still a difficult problem in clinical practice, particularly, following anesthesia for known advanced pulmonary tuberculosis cases. Therefore the antibacterisl activities of, an amphoteric detergent, Dodecyl diaminoethyl glycin hydrochloride (Hygien 51) were tested in vitro as a disinfectant against mycobacteria (M. tuberculosis H37 Rv, M. bovis, M. avium, M. tuberculosis H37 Ra, M. phlei, B.C.G.) The antimycobacterial activity tests were perfomed according to the modified Kolmer method. The testing organisms were cultured in Dubos broth at 37°C, and the detergent, Hygien 51, was: diluted with sterile distilled water to 1,3,5 and 10%. One half milliliter of culture was pipetted into each tube containing 4.5 ml of diluted detergent, and at intervals of 3, 15, 30, 60, 120, 180 and 240 minutes, a 4mm loopful of the material was removed from each tube, and transferred to Ogawa media. The tests were carrid out at two different temperatures, 20°C and 50°C. The subcultures were incubated at 37°C for more than 8 weeks. The results were obtained as follows: 1) At room temperature (20°C), all mycobateria, except M. bovis, were destroyed by treatment- with 10% solution of the detergent for more than 60 minutes. M. bovis was relatively sensitive to the detergent, and was killed by 5% solution for 30 min. and 10% for 15 min., but M. avium. was very resistant, and was not killed by 10% solution for 240 min. 2) By treatment with the detergent at 50°C, the antimycobacterial activities of the detergent were highly increased. All mycobacteria were destroyed by 1% solution for 180 min, and by 10% for less than 30 min at 50°C. In the comparison of the antibacterial activities against mycobacteria and other bacteria, it shows that mycobacteria are generally more resistant to the detergent, Hygien 51.

High-rate 마그네트론 스퍼터링을 이용한 오스테나이트 스테인리스강 박막 합성

이종훈,김광석,이상율,한상묵,한전건 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2

High-rate unbalanced magnetron sputtering process was employed to deposit a STS304 stainless steel film on S45C steel. The deposition of stainless steel film was carried out at a pressure of 2×10^(-3) torr, various target power densities, substrate bias voltages and distances of target-to-substrate. Deposition rate of the STS304 stainless steel films up to 1.3㎛/min could be obtained, but it decreased more rapidly by increasing target-to-substrate distance than by decreasing ion current. The results from XRD and EDS analysis showed that unbalanced magnetron sputtering of stainless steel target could successfully transfer the multi-element composition of the bulk material to the coating without any dramatic stoichiometric variation. SEM observation of STS304 film indicated that the structure of the film was a columnar structure(zone T structure) with a fine grain size. The Knoop hardness of coated STS304 film was measured to be approximately H_k800∼850 and this high value could be attributed to the fine grain size of the film and the residual compress stress on the film. The corrosion property of the film was evaluated using salt spray test and the results indicated that the corrosion property of stainless steel coated S45C steel was similar to that of the electroplated Cr coated S45C steel.

Ti(4) 및 Fe(3) 이온을 함유한 황산 수용액중에서 D2EHPA 에 의한 용매추출에 관한 연구

신영훈,유영홍,이철태,김재용,유정근 고려대학교 공학기술연구소 1991 고려대학교 생산기술연구소 생기연논문집 Vol.27 No.1

This study was carried out to find fundamental conditions for effective solvent extraction of Ti and Fe components from leaching solution of reaction product of (NH₄)₂SO₄ and titaniferous magnetite ore. In experiment of solvent extraction of Ti and Fe components, new aqueous phase which contains only Ti(IV), Fe(III) was used instead of leaching solution of sulfation product. The extraction of Ti(IV) and Fe(III) components from aqueous phase with D₂EHPA (Di-2-ethyl hexyl phosphoric acid)-kerosine system was carried out as function of concentration of extractant in the organic phase, pH of agueous phase and shaking time. The maximum value of separation factor(β) was 102.6 at 0.05 M D₂EHPA, aqueous phase pH 1.0, and 30 min was sufficient for the condition of shaking time. In stripping of Ti and Fe components from organic phase; the higher temperature and more concentration of H₂SO₄ increased the stripping percent of Ti and Fe components and the stripping percent of Fe was always higher than that of Ti. In separation process of Ti and Fe components, when 2 step stripping process was used, 93.7%, 99.5% Ti and Fe components was obtained respectively. While, 3 stage continuous countercurrent process was used, 96.3%, 84.7% of Ti and Fe components was obtained respectively.