• 생명과학회지
• /
• 제9권4호
• /
• pp.493-495
• /
• 1999

Eicosapentaenoic (EPA, 20:5) and docosahexaenoic (DHA, 22:6) acids of gull eggs were analyzed and the results are summarized as follows: 1. EPA and DHA were 2.25% and 4.35% in the total fatty acid of gull eggs. 2. Triglyceride fractions in the fatty acids had 0.56% in EPA and 1.59% DHA. 3. Diglyceride fractions contained 1.10% EPA and 1.97% DHA. 4. Phospholipid fractions had the most abundant amounts of 4.26% EPA and 8.13% DHA.

• 한국환경과학회지
• /
• 제27권12호
• /
• pp.1271-1277
• /
• 2018

The National Environmental Specimen Bank (NESB) has been sampling and cryogenically preserving various wildlife specimens to monitor bio-accumulations of chemical pollutants since 2010. Recently, the NESB set up a plan to develop reference materials at their facility to assure the analytical quality of and validate the analytical methods for their monitoring samples. One of the crucial characteristics of reference materials is intra- and inter-bottle homogeneity. In this study, we used ANOVA for total mercury concentrations in some samples to validate their homogeneities after milling and homogenization. We examined the intra- and inter-bottle homogeneities of two cryogenically-milled samples (Korean mussel (Mytilus coruscus) and black-tailed gull's egg (Larus crassirostris). The variations in the total mercury concentrations were not significantly different intra- and inter-bottle (mussel: F=0.74, p=0.67; gull egg: F=1.96, p=0.10). Additionally, the relative standard deviations of the total mercury concentrations showed low values (mussel: 2.02%, gull egg: 1.78%). Therefore, the cryogenic-milling process statistically proves the homogeneity of the materials of mussels and sea gull eggs for chemical analysis for total mercury.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 1998년도 공동 춘계학술대회
• /
• pp.39.1-39
• /
• 1998

No Abstract, See Full Text

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2011년도 제37회 추계학술대회논문집
• /
• pp.938-941
• /
• 2011

이 논문은 에그-박스 코어의 등간 전단 탄성계수에 대해 다루고 있다. 코어의 등가 전단 탄성계수를 얻는 방법으로 유한요소해석, 수치 해석, 실험이 있다. 이번 연구에서는 에그-박스 코어의 등가 전단 탄성계수를 평가하기 위하여 3점 굽힘 시험을 수행하였으며, 그 결과로부터 상온에서의 에그-박스 코어의 등가 전단 탄성계수를 획득하였다. 이 결과를 유한요소해석으로부터 얻어진 결과와 비교하였다.

• 환경영향평가
• /
• 제26권6호
• /
• pp.538-552
• /
• 2017

본 연구에서는 연안환경 오염물질 중 수은의 생물축적 모니터링 지표종인 괭이갈매기(Larus crassirostris) 알의 산란순서 간 수은 농도차이를 서해 백령도 번식지를 대상으로 분석하였다. 첫 번째(평균${\pm}$표준오차, $234.4{\pm}11.2ng/g\;wet$) 산란한 알의 총수은 농도는 두 번째($182.8{\pm}9.1ng/g\;wet$) 산란한 알에 비해 통계적으로 유의하게 높게 나타났다(각 n=18, t=8.4, p<0.01). 또한 생체특성치에서도 장경, 단경, 중량 모두 첫 번째 알(길이: $63.10{\pm}0.49mm$, 단경: $44.51{\pm}0.19mm$, 중량 $65.53{\pm}0.87g$) 이 두 번째 알(장경: $62.37{\pm}0.40mm$, 단경: $43.55{\pm}0.17mm$, $62.48{\pm}0.72g$)보다 통계적으로 유의하게 높게 나타났다(각 n=18, 장경 t=2.4, p<0.05; 단경 t=4.3, p<0.01; 중량 t=4.2, p<0.01). 이러한 차이는 알 생성기에 암컷이 섭취하는 먹이량과 관련이 있으며, 이는 수컷이 암컷에게 먹이를 공급하다가 첫 번째 알을 낳으면 급이 빈도와 양을 줄이는 구애급이 행동패턴 변화와 관련이 있는 것으로 추측된다. 특히, 암컷의 섭취량 감소는 메틸수은이 주로 존재하는 알 속 흰자(albumen)의 감소에 영향을 미치는 것으로 판단된다. 따라서 수은의 경우, 산란순서에 따라 축적농도가 감소하는 경향이 뚜렷하기 때문에 지역 간 그리고 시기별 비교 모니터링을 수행할 때는 목적과 조사여건(번식경과를 고려한 채취 시기, 입도(入島) 체류가능기간 등) 등을 고려하여 둥지 내 알 선택방법(첫 번째 알만 선택 또는 두 번째 알만 선택 또는 랜덤선택 등)을 일관되게 적용하는 것이 중요하다고 판단된다.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2011년도 제36회 춘계학술대회논문집
• /
• pp.123-126
• /
• 2011

에그-박스 코어의 등가 전단 탄성계수를 예측하기 위하여 유한 요소 해석을 수행하였다. 유한 요소 해석을 통한 등가 전단 탄성계수 예측 방법을 검증하기 위하여 등방성 재료인 H130-폼 코어에 대한 유한 요소 해석을 수행하였다. 유한 요소 해석을 통해 얻어진 전단 탄성계수와 참고 문헌에서 주어진 전단 탄성계수가 일치함을 확인하였다. 에그-박스 코어의 상온 및 고온에서의 등가 전단 탄성계수 변화를 확인할 수 있었다.

• Animal Bioscience
• /
• 제37권3호
• /
• pp.500-508
• /
• 2024

Objective: Due to current selection practices for increased egg production and peak persistency, the production profile, age at maturity, and body weight criteria for commercial layers are constantly changing. Body weight and age at the time of photostimulation will thus always be the factors that need to be adequately addressed among various production systems. The current study was carried out to determine the effects of pullets' body weight (low, medium, and heavy) on their performance, welfare, physiological response, and hormonal profile. Methods: With regard to live weight, 150 16-week-old pullets were divided into three groups using a completely randomized design (CRD) and held until the 50th week. One-way analysis of variance was used to evaluate the data under the CRD, and the least significant difference test was used to distinguish between treatment means. Results: In comparison to the medium and light birds, the heavy birds had higher body weight at maturity, an earlier age at maturity, and higher egg weight, eggshell weight, eggshell thickness, egg yolk index, breaking strength, egg surface area, egg shape index, egg volume, and hormonal profile except corticosterone. However, the medium and light birds had lower feed consumption rates per dozen eggs and per kilogram of egg mass than the heavy birds. Light birds showed greater body weight gain, egg production, and egg specific gravity than the other categories. At 20 weeks of age, physiological response, welfare aspects, and catalase were non-significant; however, at 50 weeks of age, all these factors-aside from catalase-were extremely significant. Conclusion: The findings of this study indicate that layers can function at lower body weights during photostimulation; hence, dietary regimens that result in lighter pullets may be preferable. Additionally, the welfare of the birds was not compromised by the lighter weight group.

• 환경영향평가
• /
• 제22권6호
• /
• pp.745-751
• /
• 2013

Environmental Specimen Banks (ESBs) have been established widely in the world since 1979 for monitoring long-term bio-accumulation of environmental pollutants. The ESBs perform the retrospective analysis of representative biological samples collected regularly and store them in cryogenic condition. In Korea, National Environmental Specimen Bank (NESB) was established in 2009. Since then, NESB had prepared the standard operating procedures (SOPs) for the seven kinds of specimens (Red Pine (Pinus densiflora), Common Carp (Cyprinus carpio), and etc.) for monitoring the effect of environmental pollution on the terrestrial ecosystem and river ecosystem. In 2012, NESB added Black-tailed Gull (Larus crassirostris)'s eggs to the list of the environmental specimen for monitoring marine environmental pollution. In this study, we sampled the eggs of the Black-tailed Gull on two islands (Baekryeongdo of the West Sea and Hongdo of the South Sea). Especially, we selected eggs which remained in the early stages of embryo development for certifying the consistent and stable monitoring for environmental pollutants in egg contents. However, it was not considered to classify an order of eggs per clutch in this study. It is known that the concentration variations of pollutants exist among eggs in one clutch. Therefore, it is needed to consider the positions of eggs in the laying sequences to meet the objective of bioaccumulation monitoring. We collected 30 eggs in each site but the amount may be insufficient to achieve storage target (over 2,000 g). Therefore, we need to consider an optimal sampling size.

• Ocean and Polar Research
• /
• 제31권3호
• /
• pp.277-282
• /
• 2009

Saunders' gulls (Laurs saundersi) which are listed as globally vulnerable species on the IUCN Red List are distributed in East Asia and breed mainly in China and Korea. Their population is estimated to be between 7,100 to 9,600. Songdo reclaimed lands in the western coast of South Korea are the main breeding sites for these species. However, most of these breeding sites have been seriously disturbed in the last several years because of new urban development constructions. This study was conducted to provide baseline data on the breeding ecology of Saunders' gulls. Since 1998, the breeding population has rapidly increased in South Korea, with the number of nests rising from 85 nests in 2000 to 185 nests in 2005. Egg volume is more variable than breadth or length. Clutch size, hatching and breeding success were $2.9{\pm}0.81$ (n=182, mean$\pm$sd.), 48.07% (75 hatched egg/156 eggs) and 29.08% (155 fledglings/533 eggs), respectively. Factors affecting breeding failure were predation, rainfall, starvation and supernormal clutches. These results are provided along with other cited literature to argue for conservation of Saunders' gulls.

• 한국수산과학회지
• /
• 제29권6호
• /
• pp.754-760
• /
• 1996

Effects of washing and additives on the texture of squid surimi gel which has been known to hard to gelation due to high protease activities and many water solubles were studied by SDS-PAGE, compression test, jelly strength and transmission electron microscopy analysis (TEM). Myosin (205 kDa) heavy chain was the major protein in water soluble fractions. It was impossible to make a gel after washing of the minced squid meat. These results suggested that squid (Todarodes pacificus) minced meat does not need a washing for good jelly products. $3.0\%$ of bovine plasma protein (BPP) produced the hardest gel ($16\%$ harder than the control) among the additives including egg white (EW), potato extracts (PE) and transglutaminase-K (TG-K) by compression test (P>0.05). Microstructure of control, $2\%$ EW and $4\%$ TG-K treated gels showed a sponge-like structure with more vacant space. Gels containing $3\%$ BPP formed the most rigid and arranged networks. Those results indicates that poor gel-network formation Was due to the degradation of myofibrillar proteins by proteases contained in the minced meat, which result in non-interlinkage.