• 한국식품과학회지
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• 제5권2호
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• pp.119-128
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• 1973

마늘은 강장(强壯), 강정(强精) 식품으로 인정되어 왔으나 그 원인은 아직 미지이다. 여기에는 비타민 E와 밀접한 연관성이 있는 Se 함유아미노산에 기인됨을 가정하고 병아리에 비타민 E, Se 및 마늘을 투여하여 각 장기에 대한 Se 의 함량을 조사하였다. 마늘을 투여한 동물은 Se 및 비타민 E와 Se 투여군보다 Se 함량이 많으며 특히 정소에는 수배이나 축적됨으로 정력제로 될수 있는 요인이 된다고 본다. 쥐에 Se를 $2\;{\mu}g/ml\;(Na_2SeO_3\;Na_2SeO_4)$ 투여하여 성장 및 생존에 미치는 영향을 조사하였다. Se 투여군에서 숫쥐는 성장 및 치사에 영향이 없지만 암쥐는 성장이 훨씬 저하되었다. 본 실험결과 마늘이 정력제에 작용을 하는 것은 Se 함유 아미노산 함량이 풍부함으로 이것이 비타민 E의 작용과 같이 불임(不姙)을 막고 노쇠한 모세혈관을 회복시키는 역할을 상승시켜 주는 것으로 간주된다. 여기서는 Se, 비타민 E, 마늘에 대한 동물의 기능에 영향을 관찰 한 것을 보고 한다.

• Journal of Nutrition and Health
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• 제20권5호
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• pp.318-329
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• 1987

이유한 Sprague Dawley 암컷 쥐에게 성장, 임신, 수유기간 동안 Pyrridoxine이 충분한 식이와 Pyridoxine 이 부족된 식이를 주어 사육했으며, 또는 다른 군은 성장, 임신기간은 pyridoxine이 부족된 식이를 공급받아가 생후 5, 10, 21일에 각각 pyridoxine 이 풍부한 식이로 바꾸어 주어회복정도를 살펴보았다. 출생후, 5, 10, 15, 21,35, 50 일에 체중을 재고 새끼를 희생시켜 뇌와 적혈구를 실험에 사용하였다. 적혈구에서는 alanine aminotransferase 활성을 측정하였고, 뇌에서는 cholesterol, proteolipid protein, cerebroside를 측정하였다. Pyridoxine이 부족된 쥐는 실험기간동안 유의적으로 체중과 뇌무게가 감소했으며, erythrocyte alanine aminotransferase 활성의 증가정도가 훨씬 높은 것으로 보아 체내 비타민 B6 의 영양상태가 나쁨을 알 수 있었다. 할편, 뇌의 ceregroside의 gakfid은 유의적인 차리를 보였으며 5, 10, 21일에 supplementation 시킨 쥐의 이유후의 cerbroside 의 생성속도의 증가로 보아 supplementation 시킨 쥐의 myelinatino 이 저해되었음을 알수 있다. 한편, cholesterol, proteolipid protein 도 부족식이에 의해 영향을 받았는데 생후 5 일에 supplementation 시킨 쥐는 정상수준으로 회복되나 10 일 이후에 supplementation 시켰을대는 정상수준에 미치지 못하였다.

• 한국결정성장학회지
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• 제24권1호
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• pp.27-32
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• 2014

본 연구에서는 매스콘크리트의 수화열 저감 및 초기강도 향상을 목적으로 3성분계 배합에 따른 콘크리트의 기초적 특성을 분석하였는데 결과를 요약하면 다음과 같다. 굳지 않은 콘크리트의 물성은 목표범위를 모두 만족하는 것으로 나타났다. 응결시간은 W/B와 관계없이 저열 시멘트 배합이 가장 빠른 것으로 나타났고, 간이 수화열은 저열 배합의 피크 온도가 가장 높은 것으로 나타났고, 저발열-B 배합이 가장 낮은 온도를 나타내었으며, 조강형 저발열 배합은 저발열-B와 유사한 것으로 나타났다. 경화 콘크리트의 압축강도는 초기재령에서 저발열-B 배합을 제외한 모든 배합이 유사한 강도 범위를 나타내었고, 장기 재령에서는 큰 차이 없이 유사한 강도 범위를 나타내었다.

• 한국산림과학회지
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• 제94권6호
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• pp.397-401
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• 2005

개비자나무로부터 추출한 HHT(homoharringonine)는 현재 가능성 있는 암화학요법제로 주목받고 있다. 국내 개비자나무 8개 천연집단의 HHT 함량 변이는 HPLC(high performance liquid chromatography)를 이용하여 조사하였고, 집단간 변이와 개체내의 부위별(잎, 줄기, 뿌리 및 종자) 변이 및 수령과 생장특성에 따른 함량 변이를 비교 분석하였다. 개비자나무의 집단간 HHT 함량 변이는 집단간에 통계적으로 유의한 차이가 인정되었으며, 거창의 남덕 유산 집단이 $1,048{\mu}g/g$으로 가장 높았고 완도의 오봉산 집단이 가장 낮았다. 개체내 부위별 함량은 잎에서 $874{\mu}g/g$으로 가장 높았으며, 다음으로 뿌리, 줄기, 종자 순으로 나타났다. 개비자나무의 HHT 함량은 수령이 증가하고 생장이 왕성해 질수록 대략 30% 정도 감소하는 것으로 나타났다.

• 천문학회보
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• 제37권2호
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• pp.73.2-73.2
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• 2012

Matusoka & Kawara (2010) showed that the number density of the most massive galaxies (log $M/M_{\odot}=11.5-12.0$) increases faster than that of the next massive group (log $M/M_{\odot}=11.0-11.5$) during 0 < z < 1. This appears to be in contradiction to another important empirical concept of "downsizing". We attempt to understand the two observational findings in the context of the hierarchical merger paradigm using semi-analytic techniques. Our models closely reproduce the result of Matusoka & Kawara (2010). Downsizing can also be understood as larger galaxies have on average smaller assembly ages but larger stellar ages. Our fiducial models further reveal the details on the history of stellar mass growth of massive galaxies. The most massive galaxies (log $M/M_{\odot}=11.5-12.0$ at z=0), which are mostly brightest cluster galaxies, obtain roughly 70% of their stellar components via merger accretion. The role of merger accretion monotonically declines with galaxy mass: 45% for log $M/M_{\odot}=11.0-11.5$ and 20% for log $M/M_{\odot}=10.5-11.0$ at z = 0. The specific accreted stellar mass rates via galaxy mergers decline very slowly during the whole redshift range, while the specific star formation rates sharply decrease with time. In the case of the most massive galaxies, merger accretion becomes the most important channel for the stellar mass growth at z ~ 2. On the other hand, in-situ star formation is always the dominant channel in the $L_*$ galaxies.

• 유통과학연구
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• 제11권9호
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• pp.35-42
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• 2013

Purpose - The objective of this paper is to identify how different incentive factors influence teachers with different ages and professional titles at LinYi University, China. Research design, data, and methodology - A total of 435 university teachers participated in the study, and the Grey Correlation Degree Analysis method was used to analyze the sample data. Results - The results indicated that teachers with different professional titles and ages have different levels of preference on various incentive factors. Young and assistant-level teachers seem to place more importance on incentives than associate and senior-level teachers. Conclusions - This study has some practical implications. First, the principal and school administrators should pay more attention to young and middle-aged teachers and to how these teachers are motivated through monetary incentives as compared to associate or senior-level teachers. Second, school administrators should pay more attention to teachers' opportunities for career growth and should provide more opportunity for academic promotion. In order to stimulate positivity in teachers, school administrators should adopt various incentive systems.

• 한국초지조사료학회지
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• 제14권4호
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• pp.264-270
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• 1994

This experiment was undertaken to determine the effect of pasture ages on the total production and seasonal yield trends, botanical composition and forage quality of pasture mixtures. This experiment was conducted at the Livestock Experiment Station, RDA, Suweon. The results obtained were as follows : 1. Total dry matterDM) yield of pasture mixtures was the highest in the first year, and thereafter no significant reduction in the 2nd through the 4th year, but decreased by 30% in the 5th year. 2. The 34.4% of total DM yield was produced at the first cut, and decreased from then on. Total DM yield of pasture mixtures varied by year and climatic facton. In 1992, Total DM and TDN yields of pasture mixtures were 13.4 and 8.5 IvlT/ha, respectively. 3. The content of crude protein(CP), in virro DM digestibility(IVDMD) and TDN of pasture mixtures were 12-14, 70-80, and 62-65%, respectively. The highest forage quality was obtained at the 4th cutting. 4. The botanical compositions of legumes and weeds were increased as the year of establishment advanced, and highly increased at the 3rd cut after summer growth. 5. Based on the results of this study it appears that economic forage production could be expended to the 4th year with proper management, and the special renovation techniques may be needed for maintenance of pasture yield from the 5th year.

• Journal of the Korean Wood Science and Technology
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• 제47권6호
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• pp.700-708
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• 2019

To verify the possibility of using resistograph to estimate the age of big old living trees, we selected three Zelkova serrata and seven Pinus densiflora in Goesan. The mean diameters at breast height of Z. serrata and P. densiflora were 102 (92-116) cm and 80 (65-110) cm, respectively. The heights measured from the ground using a resistograph ranged at 1.2-4.3 m and 0.6-1.1 m for Z. serrata and P. Densiflora, respectively. The most appropriate needle speed to determine tree-ring boundaries for measuring ring width was 1500 r/min for both tree species. Alternatively, the suitable feed speeds for Z. serrata and P. densiflora were 50 cm/min and 150 cm/min, respectively. From the measured data, the mean numbers of tree rings of Z. serrata and P. densiflora were 57 (43-68) and 104 (93-124), respectively, and the mean tree-ring widths were 4.27 mm (3.18-5.09 mm) and 2.93 mm (2.32-3.34 mm), respectively. A comparison between the time series of tree-ring widths by resistograph and that from the local master chronologies tallied for the heartwood part. Finally, this study showed that resistograph can be used to estimate tree ages when a local master chronology is available.

• Asian-Australasian Journal of Animal Sciences
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• 제30권2호
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• pp.221-228
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• 2017

Objective: The objective of this experiment was to characterize the mRNA expression profile of type IIb sodium-inorganic phosphate cotransporter (NaPi-IIb) and the biochemical values of serum alkaline phosphatase (AKP), calcium, inorganic phosphorus, tibial ash and minerals of broiler chickens with aging. Methods: A total of 56 one-day-old Arbor Acres male broiler chickens were used. Broiler chickens were weighed and samples were collected weekly from day 1. Results: The result showed that before the growth inflection point, ash, calcium, and phosphorus content in the tibia of broiler chickens increased with growth (before 3 weeks of age), although there were no significant differences in chicks at different ages in the later period of the experiment and weight gain rate was relatively slow at this stage (4 to 6 weeks). NaPi-IIb gene expression in the small intestine in the early growth stage was higher than that in the later growth stage. Expression of calbindin and the vitamin D receptor protein in the intestinal mucosa increased with age in the duodenum and jejunum. Serum AKP activity first increased and subsequently decreased after peaking at 1 week of age, but there was no significant difference after 3 weeks of age. Conclusion: These results show that compared with the early growth stage, the weight-gain rate of broiler chickens in the late growth stage gradually decreased with gradual tibia maturation, along with weaker positive transport of phosphorus in the intestine and reinforced re-absorption of phosphorus in the kidney, which might be the reason that phosphorus requirement in the late growth stage was decreased.

• 수산해양기술연구
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• 제44권4호
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• pp.312-322
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• 2008

The age and growth of the sandfish, Arctoscopus japonicus were investigated from samples of the eastern sea danish seine and gill net fishery in the East Sea of Korea from February, 2004 to December, 2007. Ages were determined from annuli in otoliths and annuli were formed between December and February once a year. Also, the main spawning period was estimated to be between December and January, thus rings were considered to be annual marks. For the relationship between fork length and total weight, a multiplicative error structure was assumed because variability in growth increased as a function of the length. The relationship between fork length and total weight were $TW=0.0083FL^{3.01}(R^2=0.966)$ for female and $TW=0.0079FL^{3.04}(R^2=0.969)$ for male. The variability in growth was constant as a function of age, revealing an additive error structure. The von Bertalanffy growth parameters estimated by a non-linear method were $L_{\infty}=31.6cm$, K=0.266/year, $t_0=-0.835$ years for female and $L_{\infty}=27.7cm$, K=0.273/year, $t_0=-0.806$ years for male. Growth at age between male and female had a significant difference(P<0.001).