• 한국응용과학기술학회지
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• 제7권1호
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• pp.77-80
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• 1990

Using $CdCl_2$ buffer solution as subphase for LB films deposition, it was achieved successively to fabricate the Y-type mixed LB films of (N-eicosyl pyridinium)-TCNQ(1:2) complex and arachidic acid. By measure of U.V spectra and capacitance, deposition status was confirmed. Electrical conductivity was measured on a perpendicular direction of the LB films and in consequence of calculated was average $2.5\;{\times}\;10^{-13}$ - $2\;{\times}\;10^{-14}$ S/cm.

• 한국가금학회지
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• 제26권4호
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• pp.217-236
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• 1999

Among polyunsaturated fatty acids (PURAs) targeted for manipulation in animal tissues (poultry eggs and meat), omega-3 PUFAs(n-3 PUFAs) are discussed in this review. 3 or 5% dietary menhaden oil (MO) supplemented layer diets was reported to increase docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) contents in the egg. MO at 1.5% also increased the deposition of up to 180mg total omega-3 fatty acids / yolk. Utilization of 5% ground flax seed (FS) resulted in similar total omega-3 fatty acid (FA) deposition as 1.5% MO. However, the basic feed formulations used in the Canadian feed industry usually include 10 to 20% FS in the egg laying diets. Recently several studies reported that addition of tocopherols in layer diets increased the tocopherol content more in the egg than any other tissue. One of reports said that 3.5% dietary oil with added tocopherols resulted in increasing tocopherol deposition and FA composition of the egg and other tissues. In the poultry meat, redfish meal (RM;4, 8, 12, 15 and 30% of diet) or redfish oil (RO;2.1 or 4.2% of diet) added to the practical corn-wheat-soybean based diets resulted in an increase in omega-3 FA and docosapentaenoic acid (DPA) contents in broiler meat lipids. Linseed oil (LO;1.0, 2.5, and 5.0% of broiler diet) supplemented in broiler diets also resulted in omega-3 FA and the ratio of omega-6 being significantly higher in poultry meat lipid than MO. Concern about fish flavor resulted in research about fish oil (FO) supplementation in broiler diets. Without the use of antioxidants, no more than 1.5% FO should be fed to broilers due to unacceptable orders from the chicken carcasses. One recent research project found that over 50mg/kg of vitamin E was required for maintaining the stability of unsaturated lipids in the meat. In regards to 'fishy'or 'crabby'taint in the eggs and poultry meat, poultry products remained acceptable when dietary fish oils were stabilized with antioxidants.

• 한국가축번식학회지
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• 제24권4호
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• pp.339-341
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• 2000

In mammals, fatty acid utilization is initiated by activation of fatty acid, catalyzed by acyl-CoA synthetase(ACS, EC6.2.1.3). This enzyme reaction is essential in fatty acid metabolism, since mammalian fatty acid synthetase contains a specific thioesterase to produce fatty acid as th $\varepsilon$ final reaction product. Acyl-CoA, the product of ACS, is utilized in various metabolic pathways including membrane biogenesis, energy production and fat deposition. (omitted)

• 마이크로전자및패키징학회지
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• 제18권4호
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• pp.43-48
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• 2011

탄소 기지상에 니켈도금을 하여 다공성 MCFC의 전극으로 사용하기 위하여 탄소 기지위에 산성용액과 염기성용액을 이용하여 무전해 니켈도금을 하였다. 알칼리 용액에서의 도금속도가 산성용액에서의 도금속도보다 빨랐으며 두가지 용액에서 pH가 증가함에 따라 도금속도가 증가하였다. 산성용액에서의 잔류응력은 압축응력을 보였으며 알칼리용액에서는 높은 인장응력을 보였으며 높은 잔류응력으로 인하여 pH 11 이상에서는 표면균열이 발생하였다. Thiourea를 첨가하였을 경우 0.5 ppm까지의 저농도에서 도금속도가 증가하다가 이후 감소하였으며 1.5 ppm 이상에서 두가지 용액에서 모두 도금이 더 이상 진행되지 않았다. Succine 산을 첨가한 경우 5 g/L까지 속도가 증가하다가 감소하여 일정한 값을 유지하였다.

• Animal Bioscience
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• 제34권4호
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• pp.751-758
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• 2021

Objective: The objectives of this study were to investigate the relationship between the mRNA expression of adipocyte type fatty acid binding protein (A-FABP) and heart type FABP (H-FABP) in Thai native chicken crossbreeds and evaluate the level of exotic inclusion in native chicken that will improve growth while maintaining its relatively low carcass fat. Methods: The fat deposition traits and mRNA expression of A-FABP and H-FABP were evaluated at 6, 8, 10, and 12 weeks of age in 4 chicken breeds (n = 8/breed/wk) (100% Chee breed [CH] [100% Thai native chicken background], CH male and broiler female [Kaimook e-san1; KM1] [50% CH background], broiler male and KM1 female [Kaimook e-san2; KM2] [25% CH background], and broiler [BR]) using abdominal fat (ABF) and muscular tissues. Results: The BR breed was only evaluated at 6 weeks of age. At week 6, the CH breed had a significantly lower A-FABP expression in ABF and intramuscular fat (IF) compared with the other breeds. At 8 to 12 weeks, the KM2 groups showed significant upregulation (p<0.05) of A-FABP in both ABF and IF compared to the CH and KM1 groups. The expression of H-FABP did not follow any consistent pattern in both ABF and IF across the different ages. Conclusion: Some level of crossbreeding CH chickens can be done to improve growth rate while maintaining their low ABF and IF. The expression level of A-FABP correlate with most fat traits. There was no consistency of H-FABP expression across breed. A-FABPs is involved in fat deposition, genetic markers in these genes could be used in marker assisted studies to select against excessive fat accumulation.

• Animal Bioscience
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• 제34권1호
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• pp.93-101
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• 2021

Objective: Temperature could influence protein and amino acid deposition as well as gut microbiota profile and composition. However, the specific effects of ambient temperature on amino acids deposition and gut microbiota composition remain insufficiently understood. Methods: A total of 300 one-day-old Avian broilers were randomly divided into three groups and reared at high, medium, and low temperature (HT, MT, and LT), respectively. Breast muscle and fecal samples were collected for amino acid composition analysis and 16S rRNA gene sequence analysis. Results: Our data showed that compared to the MT group, there was a decrease of muscle leucine and tyrosine (p<0.05), as well as an increase of methionine in the HT group (p<0.05) and a decrease of serine in the LT group. Examination of microbiota shift revealed that at genus level, the relative abundance of Turicibacter and Parabacteroides was increased in the HT group (p<0.05) and that the relative abundances of Pandoraea, Achromobacter, Prevotella, Brevundimonas, and Stenotrophomonas in the LT group were higher than those in the MT group (p<0.05). In addition, there were substantial correlations between microbes and amino acids. In the HT group. Turicibacter was negatively correlated with aspartic acid and tyrosine, whereas Parabacteroides was positively correlated with methionine (p<0.05). In the LT group, there were multiple positive correlations between Achromobacter and arginine, isoleucine or tyrosine; between Prevotella and cysteine or phenylalanine; between Brevundimonas and cysteine; and between Stenotrophomonas and cysteine as well as a negative correlation between Stenotrophomonas and serine. Conclusion: Our findings demonstrated that amino acid content of breast muscle and intestinal microbiota profile was affected by different ambient temperatures. Under heat exposure, augmented abundance of Parabacteroides was correlated with elevated methionine. Low temperature treatment may affect muscle tyrosine content through the regulation of Achromobacter.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1994년도 한국생물과학협회 학술발표대회
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• pp.133.1-133
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• 1994

No Abstract, See Full Text

• The Korean Journal of Ecology
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• 제28권3호
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• pp.169-180
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• 2005

이 종설은 산성강하물의 원인물질을 개관하고 한국, 아시아 및 세계의 산성 강하물량을 추산하며 산성비 실태를 밝히는 데 목적이 있다. 서울의 이산화황$(SO_2)$ 농도는 $1996\sim2003$년 사이에 연평균 10%씩 감소하였고 이산화질소$(NO_2)$ 농도는 8%씩 증가하였다. 서울의 빗물은 $1980\sim1991$년 사이에 연평균 pH $4.19\sim4.68$의 심한 산성비가 내렸다. 빗물의 산성도를 총 음이온 농도로 평가한 결과 한국 평균(101.3 ${\mu}equiv{\cdot}L^{-1}$), 광릉(199.2 ${\mu}equiv{\cdot}L^{-1}$) 및 관악산(341.5 ${\mu}equiv{\cdot}L^{-1}$)의 순으로 높았다. 세계 16개 국 38장소의 빗물의 총 음이온 농도를 기준으로 빗물의 산성도를 5등급으로 구분한 결과 말레이시아의 Tana Rata(16.2 ${\mu}equiv{\cdot}L^{-1}$)가 가장 청정한 비가, 중국의 중경(541.1 ${\mu}equiv{\cdot}L^{-1}$)이 가장 오염된 비가 내리고 있음이 비교되었다. 앞으로 산성 강하물은 구미에서 감소되지만 아시아 중남미 아프리카에서 증가될 전망이다.

• The Korean Journal of Ecology
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• 제21권5_1호
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• pp.449-456
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• 1998

This study was carried out to investigate the characteristics of acid deposition by stemflow, throughfall, rainfall and $SO_{2}$ in the industrial, urban and rural areas where were affected by the acid rain areas air pollution in Pinus thunbergii than Quercus spp. forest. As the stemflow pH in industrial and urban area were lowed that of rural area, the result industrial and urban, and correlation of negative ($r=-0.9415^{**}$) between pH and EC. The concentration of acid ion by stemflow, throughfall, rainfall were high $SO_{4}^{2-}$ ion at industrial areas, especially of $NO_{3}^{-}$ ion at urban areas. The concentration of basic ion all rain fall were high $Ca^{2+},\;Na^{+}$ ion at industrial areas, but there were high $Ca^{2+}$, $Na^{+}$ ion at urban areas. The concentration of $SO_{2}$ at survey areas were high $SO_{2}$ concentration at industrial and urban areas, but there was low at rural areas. There was correlation of negative ($r=-0.8007^{**}$ between pH and $SO_{2}$ concentration at survey areas. Soil acidity was also affected by stemflow and showed sigificantly low pH in industerial and urban areas.

• Carbon letters
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• 제24권
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• pp.18-27
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• 2017

Multiwall carbon nanotubes (MWCNT) with two different (L/D) aspect ratios ($7{\pm}2{\mu}m/140{\pm}30nm$ and $0.5-2{\mu}m/8-15nm$) were surface treated using nitric acid ($HNO_3$) and polyethyleneimine (PEI) prior to their deposition on carbon fibers (CF). Before the hierarchical reinforcement with CF-MWCNT, the CFs were treated with 3-glycidoxypropyltrime-thoxysilane, a coupling agent (Z6040) and with poly(amidoamine) (PAMAM) a dendrimer containing an ethylenediamine core and amine surface groups. The MWCNT were deposited on the CF using two methods, by electrostatic attraction and by chemical reactions. The changes in the CF surface morphology after the MWCNT deposition were analyzed using SEM, which revealed a higher density and uniform coverage for the PAMAM-treated CF and the short MWCNTs. The interfacial adhesion of the composite materials was evaluated using the single fiber fragmentation technique. The results indicated an improvement in the interfacial shear strength with the addition of the short-MWCNTs treated with acid solutions and grafted onto the surface of the CF fiber using electrostatic attraction.