• Journal of Korea Trade
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• 제23권6호
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• pp.131-144
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• 2019

Purpose - The purpose of this study was to investigate market power of soybeans exported by the United States to Korea. Particularly, this paper considered dichotomous characteristics of genetically modified (GM) soybeans and non-GM soybeans and conducted empirical analysis of these two segregated soybean markets to understand key tenets of market power in international soybean trade. Design/methodology - The difference in market power between GM and non-GM soybeans was analyzed using Residual Demand Elasticity (RDE) and Residual Supply Elasticity (RSE) models over the period of 2008~2018. RDE and RSE models under an imperfect competition condition were used to estimate market margins and determine whether GM and non-GM exporters or importers exercised market power in the destination market. Findings - Empirical results suggested that the U.S. had a market power on both GM and non-GM soybean exports. GM exports had greater market power than non-GM exports (14% vs. 9%). By contrast, Korea showed an inability to grab market margin or exert market power in soybean imports. Both export supply by the U.S. and import demand by Korea were found to be more responsive to price changes of GM soybeans than to prices changes of non-GM soybeans. This might be due to a self-interested, profit-seeking strategy by the exporter and many concerned consumers regarding potential adverse effects of GMOs in the importing country. Originality/value - This paper fills the literature gap by exploiting market power in both GM and non-GM markets with explicit consideration of price correlations between GM and non-GM soybeans in Korea. A number of existing studies have provided evidence for market power broadly embedded in international commodity trade. However, studies focusing on Korean markets are limited. No study has explored the country's soybean trade. Furthermore, the majority of prior studies have almost exclusively focused on the market power from a standpoint of exporting countries without discussing importers' market structure. This paper also sought to understand potentially distinguished patterns of market power between GM and non-GM markets.

• 한국식품과학회지
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• 제35권4호
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• pp.556-560
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• 2003

CP4 EPSPS에 대한 특이항체(다클론 및 단클론)을 이용하여 확립한 전보의 sandwich ELISA 분석법을 원료 콩의 GMO 분석에 적용가능한 가를 검토하였다. 원료 콩은 수입산 47점, 국산 20점을 분석하였다. 그 결과, 수입산 콩의 CP4 EPSPS 분석치는 크게 두 군으로 나뉘어 높은 군$(39.1{\pm}13.5{\mu}g/g,\;n=33)$과 낮은 군$(2.6{\pm}1.2{\mu}g/g,\;n=14)$으로 나타났다. 수입산 콩의 GMO 비율은 약 70.2%로 나타났다. 한편, 국산 콩의 CP4 EPSPS의 함량 $(0.9{\pm}0.5{\mu}g/g,\;n=20)$은 아주 낮은 것으로 나타났고 이는 non-GMO인 것으로 판단되었다. 콩나물의 경우에 GM과 non-GM 간 CP4 EPSPS의 차이를 보이고 있었고 GM 콩나물의 자엽부에서 뿌리보다 높은 CP4 EPSPS의 함량을 보여주고 있다. 국산 콩으로 만든 콩나물의 경우 CP4 EPSPS의 함량은 아주 낮은 것으로 나타나 GM과 non-GM 콩간의 구분이 가능하였다. 또한 PCR에 의해 sandwich ELISA가 정확하다는 것을 보여주었다. 이상과 같이 sandwich ELISA 방법은 신속, 간편하게 많은 콩 시료의 GMO 여부를 판단할 수 있음을 보여주었다.

• 농업과학연구
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• 제43권4호
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• pp.560-566
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• 2016

Imports of genetically modified (GM) soybeans (Glycine max) for food or feed consumption in Korea have been increasing. Although the cultivation of GM soybeans has not yet been allowed in Korea, the number of field tests for GM soybeans has also been rising. This study was conducted to investigate whether herbicide tolerant GM soybean can survive and persist in uncultivated environments when they escape from transportation routes or from isolated fields. Seeds of GM and non-GM soybeans and wild soybeans (Glycine soja) were buried in 2 and 15 cm soil depths and their viability was examined after 1, 2, 6, and 10 months. GM and non-GM soybean seeds completely lost their viability within six months of burial, whereas seeds of wild soybean maintained their viability during the study period. Seeds of soybean and wild soybeans that were sown on the soil surface germinated and grew to vegetative cotyledon stage. Seedlings of GM and non-GM soybean did not compete well with weeds, including Cerastium glomeratum, Alopecurus aequalis var. amurensis, Capsella bursa-pastoris, Conyza canadensis, Stellaria aquatica, and Erigeron annuus. Also, GM soybean did not survive through winter. However, wild soybeans competed well with the weeds and became dominant in August. Herbicide tolerant GM soybean is unlikely to persist under uncultivated environments and to become weeds.

• 농업과학연구
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• 제45권4호
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• pp.591-600
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• 2018

The use of genetically modified (GM) crops has increased continuously over the world, and concerns about the potential risks of GM crops have also risen. Although, until now, GM crops have not been cultivated commercially in Korea, it is necessary to develop technology for the safe evaluation of GM crops. In this study, we investigated the influence of gene flow from GM to non-GM soybeans by the size of the pollen donor. In the experimental design, GM soybeans were placed in the center as a pollen donor and non-GM soybeans were placed in four directions as the pollen receivers. Three sizes of pollen donor were designed as $90cm{\times}90cm$, $180cm{\times}180cm$, and $360cm{\times}360cm$. A total 22,719 seeds were collected from non-GM soybeans, and 14 hybrids were finally obtained through herbicide resistance screening and PCR analysis. The highest hybridization rate was 0.78% at a distance of 15 cm from a $360cm{\times}360cm$ GM pollen donor, and the farthest distance of hybridization was 180 cm from a GM pollen donor which was $360cm{\times}360cm$ in size. Ten hybrids were found among the 14 hybrids at the $360cm{\times}360cm$ pollen donor size, 3 hybrids at $180cm{\times}180cm$, 1 hybrid at $90cm{\times}90cm$. From these results, it could be concluded that with the larger pollen donor size, more hybridization occurred in soybeans.

• 농업과학연구
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• 제42권3호
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• pp.159-165
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• 2015

The cultivation area and use of genetically modified (GM) crops have been increased continuously over the world and concerns about the potential risks of GM crops are also increasing. One of the major concern in risk assessment is the possible development of hybrids through interspecific and intergeneric crosses with related species. This study was conducted to investigate the pollinator have an influence on insect-mediated gene transfer from GM soybeans. Hybrid was induced from GM soybeans by honeybee and western flower thrips, and non-GM soybeans were used as pollen receptor. The analysis for gene-flow was conducted by herbicide selection, immunostrip test, and PCR analysis. In the result of the analysis, three hybrids were detected on the distance 15, 75, 105 cm from pollen source in western flower thrips treatment. In honeybee treatment, one hybrid was detected in the farthest distance (300 cm). These results suggested honeybee and western flower thrips have a possibility they can transfer the introduced gene from GM soybeans to non-GM soybeans.

• Food Science and Biotechnology
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• 제15권6호
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• pp.954-958
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• 2006

A comprehensive safety evaluation was conducted to assess the potential allergenicity of newly introduced proteins in genetically modified (GM) crops. We assessed the allergenicity of CP4 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) in GM soybeans. This assessment was performed by IgE immunoblotting with soy-allergic children's sera, amino acid sequence homology with known allergens, and the digestibility of CP4 EPSPS. No differences in IgE-antigen binding by immunoblotting were found between GM soy samples and the corresponding non-GM samples. Based on the comparison of EPSPS amino acid sequence homology with current allergen databases, no known allergen was found. In addition, CP4 EPSPS protein was rapidly digested by simulated gastric fluid (SGF). Taken together, these results indicate that GM soybeans have no allergenicity in children and are as safe as conventional soybeans.

• 농업과학연구
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• 제50권4호
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• pp.749-758
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• 2023

An understanding of safety problems pursuant to environmental release of GM (Genetically Modified) crops is considered important. Among the recognized safety problems, the possibilities of weediness and ecosystem invasion are constantly being validated. We herein compared the growth characteristics and germination rate of soybeans formed by hybridization with vitamin A-enhanced soybeans carrying an introduced gene that increases β-carotene content. We also examined overwintering, survival, and weed competitiveness to evaluate hybrid ecological impact on long-term unmanaged cultivatable land. These studies revealed that the hybrid soybeans exhibited intermediate growth characteristics and germination rate compared with the vitamin A-enhanced soybeans and wild soybeans, or exhibited traits similar to those of the maternal strain. Overwintering experiments were conducted by planting seeds at depths of 0, 5, 10, and 20 cm and recovering them after three or five months. After five months, all seeds at depths more than 5 cm lost viability. Among seeds recovered after three months, only wild soybeans retained viability at depths of more than 5 cm. Survival and weed competitiveness were assessed by sowing each type of seed and performing no irrigation, or pest or weed control. Quantitative assessment of numbers of individual soybean plants that appeared in the experimental plot revealed that all plants germinated after sowing, but only wild type plants survived overwintering. These studies suggest that both GM soybeans and hybrid soybeans cannot survive in uncultivated land even if they are released into the environment, which indicates less possibility of ecosystem invasion and weediness.

• 약학회지
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• 제45권3호
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• pp.293-301
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• 2001

Genetically modified organism (GMO) using recombinant DNA technique has been exponentially increased, however there are still arguments for the safety of GM foods. The objective of this research was to compare the allergens of GM soybean(Roundup Ready$^{TM}$) with conventional soybeans. Each soybean extracts were prepared as crude extracts, heated extracts, and as heated and simulated gastric quid (SGF)-digested samples to characterize the stability of allergens to physicochemical treatment. Positive sera from 20 soybean-sensitive patients and control sera from 5 normal subjects were used to identify the endogenous allergens in soybeans. Specific-IgE binding activities to each soybean preparations were evaluated by ELISA and immunoblot technique. In ELISA result, IgE binding activities of positive sera to soy crude extracts generally showed two fold higher mean value than those of control sera, how-ever there was no significant difference between GM soybean and natural soybean varieties. Extracted proteins form each of the soybean preparations were separated with SDS-PAGE. The band pattern of GM soybean was very similar to those of natural soybean varieties. Immunoblots for the different soybeans revealed no differences in IgE-binding protein patterns, moreover, disclosed five prominent IgE-binding bands (75, 70, 50, 44 and 34 kDa) in crude extracts, four (75, 70, 44 and 34 kDa) in heated preparations, one (50 kDa) in heated and SGF-digested preparations. These IgE binding bands were consistent with previously reported results on the soybean. These results indicate that GM soybean (Roundup Ready$^{TM}$) is no different from natural soybean in terms of its allergen.gen.

• 한국식품과학회지
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• 제36권5호
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• pp.828-832
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• 2004

본 연구에서는 유전자 재조합 되지 않은(non-GM) 대두와 유전자 재조합된(GM) 대두가 혼입되어 제조된 두부에서 효소 면역 측정법을 이용하여 non-GM 대두의 혼입량을 추정하고자 하였다. 두부의 SDS-PAGE 실행 결과 non-GM 두부에서만 나타나는 특이 단백질 non-GM 113kDa 밴드와 non-GM과 GM 두부에서 모두 나타나는 non-GM 24kDa 밴드를 선별하고 이들을 토끼에 면역하여 항체생성 여부를 ELISA한 결과 non-GM 113kDa과 non-GM 24kDa 단백질 모두 항체가 형성됨을 확인하였고 $10^{-1}-10^{-6}$의 단백질 희석배수에서 두부를 이들 항체에 대하여 ELISA함으로써 원료대두의 GM여부를 확인할 수 있었다. 이들 중, 보다 감도가 높았던 non-GM 113kDa 단백질을 $10^{-7}-10^{-6}$의 배수로 희석하여 ELISA 흡광도와 non-GM 단백질의 관계를 나타내는 표준곡선을 작성하였고, 임의로 non-GM 대두와 GM 대두를 혼합하여 제조한 두부의 ELISA 흡광도를 이 표준곡선과 비교하여 non-GM 원료와 GM 원료 작물의 혼입율을 측정한 결과, 높은 정확도를 보였다.

• Archives of Pharmacal Research
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• 제24권3호
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• pp.256-261
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• 2001

Allergenicity of genetically-modified (GM) soybean was evaluated in male Sprague Dawley rats. To confirm the GM soybean used in this study, the polymerase chain reaction (PCR) was performed using the chromosomal DNA of soybeans. The PCR result provided the clear discrimination of genetically-modified (GM) soybeans. To evaluate the allergenicity of GM soybean and non-GM control one, the soybean homogenate was sensitized subcutaneously 3 times a week for 3 weeks. The doses of soybean were 0, 2 and 20 mg/kg in the protein basis. A week after the last sensitization, antisera were recovered from individual animals. When the sera were injected intradermally on the clipped back of unsensitized rats with various dilutions, followed by a challenge with 20 mg/kg of soybean homogenate containing 1% Evans blue, no sign of passive cutaneous anaphylaxis reaction was detected. In addition, when the sera were treated in the cultures of peritoneal mast cells, the increase of histamine release by anti-(GM soybean) sera was not observed when compared to that by anti-(non-GM soybean) sera. The present results indicate that the GM soybean might not act as a strong allergen in male Sprague Dawley rats.