• 한국약용작물학회지
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• 제26권4호
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• pp.291-295
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• 2018

Background: The use of Rehmannia glutinosa of the family Scrophulariaceae, in traditional medicine is well known. This study was conducted to elucidate the effect of air curing of the seed rhizome of R. glutinosa on its storability and yield. Methods and Results: The root of the R. glutinosa cultivar (Dagang) was harvested in at the end of November. The seed rhizomes were air cured for one to seven days. They were subsequently wrapped with newspaper and further stored in a plastic container at $1^{\circ}C$. It was observed that the weight loss and decay rates were significantly lower in the air cured seeds than in the untreated ones. Moreover, the decay rate of the control was approximately 50%, 120 days after storage. However. the decay rate of all the air cured treatment groups was less than 1%. Additionally, air curing led to an increase in the germination rate of the seeds and the root yield when compared with the untreated groups. Taken together, the ideal treatment period for air curing was found to be 3 days. Under these conditions, the germination rate and yield were 88.7% and 2,185 ㎏/10a, respectively. Conclusions: This study successfully demonstrated that the air curing of seed rhizomes can lead to a considerable increase in the storability and yield of R. glutinosa.

• 대한조선학회논문집
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• 제43권5호
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• pp.604-610
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• 2006

Common structural rules of JBP(Joint Bulker Project) and JTP(Joint Tanker Project), which will come into effect in 2006, invoke the necessity of the ultimate limit state(ULS) design for ship structures. Even though the many applications of ULS analysis have been performed for ship structures, there have few studies carried out for deck machineries and their supporting structures. Recently four major Korean shipbuilders(DSME, HHI, HHIC, SHI) jointly developed and proposed a new design standards for mooring fittings and also proposed the SWL (Safety Working Load) obtained based on the first yield criterion. In this study, various ultimate strength analyses were performed for bollards and their foundation structures whose yield strengths were quantified by the research consortium. Prior to performing the ultimate strength analyses, the numerical calculation method was substantiated with the test results provided in the joint work report. Based upon the results of this study, it can be concluded that the reinforcements to increase the yield strength are not always resulted in the enhancement of the ultimate strength. Furthermore, the additional production costs for the reinforcements can not be rewarded by the ultimate strength. Therefore, another alternative arrangements should be developed in the view point of ultimate strength.

• 한국연초학회지
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• 제2권1호
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• pp.37-52
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• 1980

신개간지 토양에 대한 인산시용 수준별 석회, 퇴비증시, 퇴비와 붕소의 혼합시용에 따른 비옥도 증진의 효과가 연초의 수량 및 품질에 미치는 영향을 2년간에 걸쳐 시험한 결과를요약하면 다음과 같다. 1. 개량제 처리의 효과는 1차년도에서 보다 2차년도에 담배 생육과 엽면적지수와 단위엽 면적중을 월등하게 증가시켰다. 3. 개량제의 시용으로 초년도의 pH, 치환성염기등이 숙전과 같은 수준으로 개선되었으며, 처리별 비옥도 증진효과는 퇴비증시구가 컸다. 3. 2차년도 시험결과에서 수량은 대조구에 비하여 15∼25% 증수되었고, 품질은 처리간에 큰 차 없으나, 개량제 시용으로 대조구에 비하여 3 - 7% 향상되었다. 수익 (10a당 수납대금)은 인산흡수계수에 대한 3 %조절량+퇴비증시구가 가장 높아 대조구보다 34%의 증가를 가져왔다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권2호
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• pp.159-163
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• 2004

Data pertaining to first lactation records of 316 Murrah buffaloes, progeny of 47 sires, maintained at NDRI Farm for a period of 18 years were analysed to construct selection indices and to examine their robustness by changing the relative economic values of different economic traits. A total of 120 selection indices were constructed for three sets of relative economic values ( 40 for each set) considering different combinations of seven first lactation traits viz. age at first calving (AFC), first lactation 305 day or less milk yield (FLMY), first lactation length (FLL), first calving interval (FCI), milk yield per day of first lactation length (MY/FLL), milk yield per day of first calving interval (MY/FCI) and milk yield per day age at second calving (MY/ASC). The three sets of relative economic values were based on economic values of different traits, 1% standard deviation of different traits and regression of different traits on FLMY. The 'optimum' indices for the first two sets had five traits each namely AFC, FLMY, FLL, FCI and MY/ASC giving improvement in aggregate genotype of Rupees 269.11 and Rs. 174.88, respectively. The accuracy of selection from both indices was 70.79 and 69.39%, respectively. The 'best' selection index from the third set of data again had five traits (AFC, FLMY, FLL, FCI and MY/FLL) giving genetic gain of Rs. 124.16 and accuracy of selection of 71.81%. The critcal levels or break-even points for FLMY for varying levels of AFC and FCI estimated from the "optimum index" suggested the need of enhancement of present production level of the herd or reduction of AFC or FCI. It was concluded that economic values of various first lactation traits were the most appropriate to construct selection indices as compared to other criteria of assigning relative economic weights in Murrah buffaloes.

• 환경생물
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• 제17권3호
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• pp.257-261
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• 1999

저선량 방사선 조사가 땅콩 “팔팔” 품종 종자의 발아율과 초기생육 및 수량에 미치는 효과를 알아보고자 ${\gamma}$선을 0.5~20.0 Gy 까지 조사하여 포장에 직파재배하였다. 땅콩 종자의 발아율은 저선량 조사에 의해 별다른 효과가 없었으나 유묘초장은 저선량 조사구에서 다소 양호하였다. 수량구성요소 중협수와 종실수 및 종자수량은 12.0 Gy 조사구에서 가장 높았으며, 대조구에 비해 각각 27%와 17% 및 19% 유의성있게 증가하였다. 100립중은 4.0 Gy 조사구가 87.2g으로 대조구의 78.3g에 비해 11%정도 증가하여 저선량 조사에 의해 땅콩 수량이 유의성있는 증가효과를 보였다.

• 한국초지조사료학회지
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• 제25권2호
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• pp.89-96
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• 2005

본 연구는 가축분뇨의 양분 유실량을 조사하기 위하여 옥수수 재배시 비료의 종류(화학비료, 돈분퇴비 및 우분액비)와 경사도($0\%\;9\%\;18\%$)를 달리 했을 때 옥수수의 생산성과 유실수중의 N과 P의 함량을 조사한 결과는 다음과 같다. 옥수수의 건물수량은 경사도와 비례하여 감소하였고, 비료의 종류에 따라서는 우분액비, 화학비료, 돈분퇴비의 순으로 높았으며, N 함량은 화학비료, 우분액비, 돈분퇴비의 순으로 증가되었지만, 경사도에 영향은 나타나지 않았다. 옥수수에 의한 N 생산량은 경사도의 증가와 비례하여 감소하였고 우분액비가 돈분퇴비 시용시보다 2배 이상 많았다. 또한, 가축분뇨의 종류와 경사도별 유실수중의 년중 평균 무기태 N 함량은 서로간에 유의적인 차이를 보이지 않았고, $NO_3$ -N 함량의 변화는 경사도와 비례하여 높게 나타났으며, $NO_3$-N의 함량은 결코 8ppm $NH_4$-N과 $PO_4$-P의 함량은 1 ppm을 초과하지 않았다.

• 생물환경조절학회지
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• 제24권1호
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• pp.27-33
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• 2015

토마토의 착과와 수확량은 여름철 비닐하우스내 고온스트레스로 인하여 감소하게 된다. 본 연구는 여름철 화천지역에 위치한 비닐하우스에서 지베렐린($GA_3$)과 2,4-Dichlorophenoxy Acetic Acid(2,4-D) 처리가 토마토의 수확량, 착과율, 착과 후 과실품질에 미치는 영향을 알아보기 위해 'Adoration' 품종을 이용하여 실험하였다. $GA_3$ 0-, 5-, 10-, $15mg{\cdot}L^{-1}$와 2,4-D 0-, 5-, $10mg{\cdot}L^{-1}$를 개화 초기에 처리한 후 착과율, 수확량, 과실품질과 관련된 형질을 관찰한 결과, $GA_3$ $10mg{\cdot}L^{-1}$처리구에서 대조구에 비해 14.2%의 착과율 증가를 보였다. $GA_3$처리구에서는 수확량, 과중, 상품과실 수에 유의한 차이가 있었다. 2,4-D를 개화기에 처리했을 경우 착과율, 수확량, 상품과의 과중에 영향을 미쳤으며 $GA_3$과 2,4-D를 각각 $5mg{\cdot}L^{-1}$ 농도로 혼합처리 하였을 때 가장 높은(62.5%) 착과율을 나타내었다. 과실크기와 고형물함량은 $GA_3$처리구에서만 유의성 있는 차이를 보였다. 따라서 여름철 비닐하우스의 고온조건에서 $GA_3$ $0mg{\cdot}L^{-1}$처리구와 2,4-D $5mg{\cdot}L^{-1}$를 처리했을 때 착과율이 가장 높아 많은 수확량을 기대할 수 있을 것으로 판단된다.

• Journal of Plant Biotechnology
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• 제39권3호
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• pp.154-162
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• 2012

This study was conducted to evaluate agronomic characteristics such as growth, quality, and yields of StMyb1R-1 transgenic potato and also to obtain the basic data for establishing assessment guidelines of transgenic potato. Three transgenic lines (Myb 1, Myb 2, and Myb 8) were cultivated under conventional irrigation, drought condition, and severe drought condition and were analyzed by comparing with wild type, non-transgenic cv. Superior. Myb 2 showed a different flower color from wild type and Myb 1 had much bigger secondary leaflets than wild type. Myb 1 and Myb 2 showed higher $P_2O_5$ content in both top and root zone and longer shaped tubers than wild type. In yield factors, transgenic lines had more tubers than wild type, however their yield decreases were severe because of the poor enlargement of tuber under water deficit condition. This tendency was noticeable in Myb 1 and Myb 2. In TR ratio, chlorophyll content, dry matter rate, and relative water content, there were no big differences between transgenic lines and wild type. Meanwhile, in phenotype, growth, quality, and yield factors, substantial equivalent was confirmed between Myb 8 and wild type. Then, Myb 8 showed the highest marketable tuber yield under conventional irrigation, while showed lower level than wild type under water deficit. Judged by this result, the enhancing droughttolerance by StMyb1R-1 gene might actually not mean the enhancement of photosynthesis or starch accumulation in tuber and, furthermore, not the yield improvement. More detailed research will be required to accurately understand the relationship between StMyb1R-1 and yield factors.

• 문화기술의 융합
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• 제7권4호
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• pp.683-691
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• 2021

본 연구의 목적은 온도조건 별로 밀도요동 초임계 유체를 이용하여 추출한 대마종자 추출물의 수율 측정과 생리활성능을 평가하고, 리포좀 제형으로 난용성 추출물의 용해를 가능하게 하여 경피투과도를 증진시키는 데 있다. 수율 측정 결과, 60℃로 추출한 대마종자가 가장 높게 나타났고, 항산화 실험에서 total polyphenol content assay, DPPH radical scavenging assay, ABTS+ radical scavenging assay 결과, 최고농도에서 45℃ 추출물의 폴리페놀 함량과 radical 소거능이 가장 크게 나타났다. 항균실험 결과, P ropionibacteium acnes 균주에서만 clear zone이 나타났다. 추출물을 3차 정제수에 용해시킨 제형보다 리포좀으로 캡슐화한 제형에서 particle size의 감소와 zeta potential의 절댓값 증가를 확인하여 제형 안정성을 확인하였고, 경피투과도의 증진 또한 확인하였다. 이러한 실험결과를 바탕으로 난용성인 초임계 대마종자 추출물을 화장품의 기능성 천연물 소재로써 활용 가능성을 확인하였다.

• KSBB Journal
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• 제23권4호
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• pp.335-339
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• 2008

Biodiesel is an alternative and renewable energy source, which is hoped to reduce global dependence on petroleum and environmental problem. Biodiesel produced from a variety of oil sources such as vegetable oil, animal fat and waste oils, and has properties similar to those associated with petro-diesel, including cetane number, volumetric heating value, flash point, viscosity and so on. In this study, we investigate the effect of quality of raw materials on alkali-catalyzed transesterification for producing of biodiesel. The increase of content of free fatty acid and water in oil were caused the sharp decrease of conversion yield. Also, the low purity of methanol in reactant was inhibited the reaction rate. In the case of addition of sodium sulfate as absorbent to prepare catalyst solution, the content of fatty acid methyl ester in product was increased more about 1.6% than that of control. However, the addition of zeolite, sodium chloride and sodium sulfate as absorbent in reactant to remove water generated from reaction did not show any enhancement in the reaction yield. This result may provide useful information with regard to the choice and preparation of raw materials for more economic and efficient biodiesel production.