• Journal of Animal Science and Technology
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• 제49권6호
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• pp.761-772
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• 2007

본 연구는 잣 부산물의 급여가 비육돈의 생산성, 혈액성상, 도체특성 및 분내 악취 발생물질에 미치는 영향에 대해 알아보기 위하여 시험을 실시하였다. 3원 교잡종 비육돈 60두를 공시하였으며, 시험 개시시 체중이 86.01±0.25 kg 이었고, 35일간 사양시험을 실시하였다. 시험설계는 1) T1(미루나무톱밥 2%), 2) T2(미루나무톱밥 1%+잣 부산물 1%) 및 3) T3(잣 부산물 2%)로 3개 처리를 하여 처리당 5반복, 반복당 4두씩 완전임의 배치하였다. 사양시험 기간 동안 일당증체량, 일당사료섭취량 및 사료효율은 처리구간에 유의적인 차이가 없었다(P>0.05). 또한, 영양소 소화율 및 혈액특성은 처리구간에 유의적인 차이가 없었다(P>0.05). 육색에 있어서 적색도를 나타내는 a*-값 및 육의 관능평가 결과 육색은 T3 처리구가 T1처리구와 비교하여 유의적으로 높게 나타났다(P< 0.05). 살코기 내 지방산 조성에 있어서 C18:1 및 total MUFA는 T1 처리구가 다른 처리구와 비교하여 유의적으로 가장 낮게 나타났으나(P<0.05), ω6 및 total PUFA는 T1 처리구가 T2처리구와 비교하여 유의적으로 높은 함량을 나타내었다(P<0.05). 지방 내 지방산 조성에서 있어서 total SFA는 T2 처리구가 T3 처리구와 비교하여 유의적으로 높게 나타났으며(P<0.05), C18:1는 T2 처리구가 T1 처리구보다 높은 함량을 나타내었다(P<0.05). 분내 유해가스 발생 물질의 함량에 있어서는 처리구간에 유의적인 차이가 없었다(P>0.05). 결론적으로, 본 시험의 결과 비육돈에 잣 부산물의 급여는 육색 및 지방산 조성에 영향을 미치는 것으로 사료된다.

• 한국자기학회지
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• 제17권5호
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• pp.183-187
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• 2007

다강체 물질인 망간 산화물 $YMn_{2-x}Fe_xO_5$ (x = 0.00, 0.01)를 졸-겔법을 이용하여 합성하였다. 결정학적 및 자기적 성질을 알아보기 위해 x-선 회절기, 고 분해능 중성자 분말 회절기, 진동 자화율 측정기를 이용하였으며, 전기적 성질은 Physical Property Measurement System(PPMS)를 사용하여 연구하였다. x-선 회절 분석 결과 $YMn_2O_5$ 시료의 결정구조는 격자상수 $a_0=7.275\;{\AA},\;b_0=8.487\;{\AA},\;c_0=5.674\;{\AA}$을 갖는 단일상의 orthorhombic 구조로 분석 되었고, Fe가 치환됨에 따른 격자상수의 변화는 없었다. $YMn_2O_5$의 중성자 회절 실험 결과 다강체 특성이 발현되는 온도($T_2=18K$)에서 격자상수의 변화 및 자기 구조에 의해 나타나는 회절 피크가 변화하는 모습을 확인하였다. 또한 우리는 뫼스바우어 분광법을 이용한 전기 사중극자 분열값의 확인을 위하여 $YMn_{1.99}Fe_{0.01}O_5$를 합성하였고 $YMn_2O_5$와 $YMn_{1.99}Fe_{0.01}O_5$의 물리적 특성의 변화는 없는 것으로 확인하였다[1]. $T_2$에서 전기 사중 극자 분열값의 변화가 확인된 $YMn_{1.99}Fe_{0.01}O_5$ 시료의 유전상수 및 자화율 그래프를 통하여 다강체 특성이 서로 연관되어 상호작용을 함을 알 수 있었다.

• 한국환경과학회지
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• 제3권3호
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• pp.197-207
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• 1994

Microorganisms capable of utilizing 2,4,5-trichlorophenoxyacetic acid(2,4,5-T) as sole carbon source were isolated from soil by enrichment culture. Among these strains, EL-O7IP had the highest biodegradability of 2,4,5-7, and according to its morphological and physiological characteristics, it was identified as Pseudomonas sp. This strain was resistant to rifampicin, streptomycin, ampicillin, kanamycin and such metal ions as $Zn^{2+}$, $Cu^{2+}$ Various compounds of chlorinated phenol and substrate analogs were more easily utilized than 2,4,5-7, but biodegradation rate for each compound was different. The strain easily utilized the compounds of chlorinated substituents on phenol in the order of ortho-, para-, and meta- position. The biodegradability of this strain was very stable. Key words : 2,4,5- trichlorophenoxyacetic acid, Pseudomonas sp .

• 한국수산과학회지
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• 제45권2호
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• pp.97-103
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• 2012

This study compared the composition and texture of muscle and levels of detoxification and antioxidant enzymes in the livers of stocked and cultivated rockfish Sebastes schlegeli released after the primary culture stage in Tongyoung, South Korea. The crude lipid content of muscle was significantly higher ($P$<0.05) in cultivated rockfish than stocked rockfish, while the texture did not differ significantly ($P$>0.05). The condition factor (CF) and hepatosomatic index (HSI) did not differ significantly and the growth of stocked and cultivated rockfish was similar. The levels of the detoxification enzymes cytochrome P450 (CYP) and Ethoxyresorufin-O-deethylase (EROD) were significantly lower in the livers of stocked rockfish, perhaps because of their reduced exposure to xenobiotic compounds. In addition, stocked rockfish had a significantly ($P$<0.05) lower CAT and higher GR than cultivated rockfish, but similar levels of tGPx, SOD, GSH, and GSSG. The present study shows that the growth rates of stocked and cultivated rockfish are similar and that stocked rockfish are exposed to fewer xenobiotic compounds and less oxidative stress.

• Tribology and Lubricants
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• 제19권4호
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• pp.203-210
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• 2003

In order to enhance the thermal stability of binder materials of bonded type solid lubricants, several metal-alkoxide based sol-gel materials such as methyltrimethoxysilane(MTMOS), titaniumisopropoxide (Ti(Opr$\^$i/)$_4$), zirconiumisopropoxide (Zr(Opr$\^$i/)$_4$) and aluminumbutoxide (Al(Obu$\^$t/)$_4$) were modified chemically by both epoxy and acrylic silane compounds. Friction and wear characteristics of the bonded solid lubricants, whose binders were of several hybrid ceramic materials, were tested with a reciprocating tribo-tester. Wear life was evaluated with respect to the heat-curing temperature, friction temperature, type of supplement lubricants, and ratio of binder materials. Test results showed that the Si-Zr hybrid ceramic materials modified by epoxy-silane compounds had a higher wear life compared to others. Sb$_2$O$_3$ was the most effective supplement lubricants in the high temperature, and BUS analyses revealed that it was caused mainly by a strong anti-oxidation effect to MoS$_2$ particles. The higher heat-curing temperature resulted in the higher wear life, and the higher friction temperature resulted in the lower wear life.

• Journal of Applied Biological Chemistry
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• 제50권4호
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• pp.259-263
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• 2007

Trapa pseudoincisa Nakai, an aquatic plant, was extracted with 80% aqueous MeOH, and the concentrated extract was successively partitioned with EtOAc, n-BuOH, and $H_2O$. The EtOAc fraction gave three compounds, which were isolated through the repeated silica gel and ODS column chromatographies. Based on the spectroscopic data obtained from NMR, MS, and IR, the chemical structures of the compounds were determined as cycloeucalenol (1), ursolic acid (2), and 2${\beta}$,3${\alpha}$,23-trihydroxyurs-12-en-28-oic acid (3). These triterpenoids were isolated for the first time from Hydrocaryaceae plants including T. pseudoincisa NAKAI.

• 약학회지
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• 제42권4호
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• pp.353-358
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• 1998

The MeOH extract of the bark of Paeonia moutan showed potent inhibitory effect on the mushroom tyrosinase activity in vitro. The activity-guided fractionation of t he MeOH extract resulted in the isolation of three active compounds. The chemical structures of these compounds were elucidated by chemical and spectroscopic evidence as catechin, 1,2,3,6-tetra-O-galloyl-${\beta}$-D-glucose and 1,2,3,4,6-penta-0-galloyl-${\beta}$-D-glucose, respectively. Among them, the inhibitory activity by 1,2,3,6-tetra-galloyl-${\beta}$-D-glucose on mushroom tyrosinase was more potent $(IC_{50}=3.5\;{\mu}M)$ than that of kojic acid $(IC_{50}=8.7\;{\mu}M)$ ,but catechin enhanced the mushroom tyrosinase activity 50% in the concentration of 34.5M.

• 대한화학회지
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• 제65권5호
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• pp.313-319
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• 2021

Menthol (M) is a cyclic monoterpenode and is a major component of essential oils. Menthol, along with menthol, isomenton, etc., gives taste and odor of the mint plant, and when it comes to menthol in general, L- or (-) -menthol is usually used. Included in pharmaceuticals, cosmetics and pesticides. It has antimicrobial, antibacterial, antioxidant properties. It is also known that the licorice plant (Glycyrrhiza Glabra L.) differs from other types of plants by its medicinal properties. For many years it has been used in folk medicine. Extraction of licorice root revealed up to 25% glycyrrhizinic acid (GA). Its aglycone - glycyrrhizic acid is notable for its structural similarity to the adrenal cortex hormones. Currently, GA and glycyrrhizic acid are widely used in medicine as a remedy for colds, allergies, viral diseases, tumors. The biological activity of menthol and GA-based supramolecular compounds has been poorly studied, and their effect on the functional parameters of rat liver mitochondria has been studied little. For this purpose, in our experiments, the effect of menthol (M), glycyrrhizinic acid (GA) and their supramolecular complexes obtained in different proportions on in vitro and in vivo studies on rat liver mitochondria was studied.

• 대한화학회지
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• 제67권2호
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• pp.137-144
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• 2023

In this study were evaluated the whitening and anti-oxidative activities from the extracts of Sorbus alnifolia branches, and identified the chemical structures of the active ingredients. In the whitening tests using α-MSH stimulated B16F10 melanoma cells, the 70% ethanol extract and n-butanol (n-BuOH) fractions concentration-dependently inhibited cellular melanogenesis and intracellular tyrosinase activities without causing cell toxicity. The total polyphenol content of n-BuOH and ethyl acetate (EtOAc) fractions were measured to be respectively 241.1 ± 1.1 and 222.9 ± 2.4 (mg/g GAE), and the total flavonoid content of EtOAc fraction was 75.3 ± 2.0 (mg/g QE). Upon anti-oxidant studies with DPPH and ABTS⁺ radicals, potent radical scavenging activities were observed in the EtOAc and n-BuOH fractions. Moreover, in the study of cell protection efficacy using HaCaT keratinocytes damaged by H₂O₂, the EtOAc and n-BuOH fractions showed a very positive results on prevention of oxidative stress. Phytochemical studies for this extract resulted in the isolation of four compounds; 2-oxopomolic acid (1), euscaphic acid (2), epi-catechin (3), prunasin (4). These results suggested that the extract of S. alnifolia branches containing compounds 1-4 as natural ingredients could be used as whitening and anti-oxidant ingredients in cosmetic formulations.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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• pp.27-30
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• 2006

In this paper, the undoped and Co-doped $Zn_4SnSe_6$ single crystals grown by the chemical transporting reaction(CTR) method using iodine as a transporting agent are investigated. For the crystal growth, the temperature gradient of the CTR furnace was kept at $680^{\circ}C$ for the source zone and at $780^{\circ}C$ for the growth zone for 7days. It was found from the analysis of x-ray diffraction that the $Zn_4SnSe_6$ and $Zn_4SnSe_6Co^{2+}$ compounds have a monoclinic structure. The direct optical energy band gap of the $Zn_4SnSe_6$ and $Zn_4SnSe_6Co^{2+}$ single crystals at 300K were found to be 2.146eV and 2.042eV.