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Confirmation of Green Fluorescent Protein Transformants using PCR
전선영 ( Sunyoung Jeon ),( Denver Walitang ),( Shamim Amed ),( Aritra Roy Choudhury ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Plant growth promoting bacteria (PGPB) have beneficial effects on plant growth via an enhancement of the nutrient status of their host plant. The means by PGPB enhance the nutrient status of host plants can be categorized into five areas: biological N2 fixation, increasing the availability of nutrients in the rhizosphere, inducing increases in root surface area, enhancing other beneficial symbioses of the host, and combination of modes of action. These bacteria have plant growth promoting traits such as 1-aminocyclopropane-1-carboxylate (ACC) deaminase, indole acetic acid (IAA) production, salicyclic acid, phosphate solublization, siderophore production. In endophytic relationships, PGPB actually reside inside the host plant. PGPB maybe found in the surface of the root, stems or leaves. To find the location of PGPB in plant, Green Fluorescent Protein from jellyfish Aequoria victoria used as a valuable molecular marker which can be expressed in many organisms. GFP transformants emitting fluorescence were suitable for studying plant colonization under environmental condition. This study aims to assess the process of transformation of GFP insert into bacteria by PCR amplification. For the development of gfp mutant, triparental mating was carried out in Pseudomonas frederiksbergensis OB145, Pseudomonas umsongensis OB243, Pseudomonas umsongensis OB133, Pseudomonas moorei OR108, Pantoea sp CBMB55, Brevibacterium iodium RS16 and Burkholderia pyrrocinia CBPB-HOD using donor E.coli strain pFAJ1820 and helper E.coli strain pRK2013. Antibiotic resistance is used as a selection marker to ensure that bacteria in a culture contain a particular plasmid. Transfer of plasmid pFAJ1820 into these strains was confirmed through PCR amplification with specific primer. Band had been confirmed by using Gel-doc. In this study, plant growth promoting bacteria were successfully checked for GFP transformation. Confocal microscopy will be used to confirm effective colonization and intercellular localization of bacteria strains in plants.
전순영 ( Jeon Sunyoung ) 숭실대학교 숭실평화통일연구원 2023 평화통일논총 Vol.2 No.2
As the number of North Korean defectors who have been in Korea for more than ten years increases, the focus of discussions on support is shifting to their next generation. Since 2015, the more children of North Korean defectors born in third countries are entering South Korea than those born in North Korea, and the proportion of South Korean births is also rising considerably. As the diversity within young North Korean defectors grows, blind spots in laws and systems are being exposed. It is time to re-conceptualize the category of young North Korean defectors and reorganize the support system through discussions on who, how, and how long they should be supported. Young North Korean defectors are experiencing different difficulties depending on their country of birth, type of entry, age group, family environment, economic situation, language ability, and learning ability. Confusion of identity, discrimination and prejudice in Korean society, complicated family relationship and economic instability are common living conditions for most of them. The support system for young North Korean defectors consists of the Ministry of Unification, the Ministry of Education, and the Ministry of Gender Equality and Family. As a result of the study, the lack of cooperation between ministries, unequal college entrance opportunities, lack of access to the welfare system, controversy over equity, and lack of support for alternative schools were pointed out as problems with the support system for young North Korean defectors. To compensate for these, this study proposes the following measures: to include children born in third countries in the category of young North Korean defectors on a par with those born in North Korea, to consider support for children born in South Korea, to establish statistics and systematize integrated support among related ministries, to expand welfare services to strengthen family functions, to improve South Koreans’ perception of North Korean defectors, and to respect their right to refuse support.
Photoelectrochemical Deposition of CdZnSe Thin Films on the Se-Modified Au Electrode
Sunyoung Ham,명노승,이웅기,팽기정,Soyeon Jeon 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Photoelectrochemical deposition of CdZnSe thin films on the Se-modified Au electrode using electrochemical quartz crystal microgravimetry (EQCM) and voltammetry is described. Corrosion of pre-deposited Se electrodes by illumination at a fixed potential resulted in Se²- species, which was manifest from the EQCM frequency changes. Se²- species generated from the photocorrosion reacted with Cd²+ and Zn²+ ions in the electrolyte to form CdZnSe films on the Au electrode. The effect of electrolyte composition on the composition and band gap of CdZnSe films was studied in detail. Also, photoelectrochemistry, EDX, Raman spectroscopy were used for the characterization of CdZnSe thin films.
Effects of Boronic Acid on the Fluoride-selective Chemosignaling Behavior of a Merocyanine Dye
Sunyoung Cha,Hye Lim Jeon,Myung Gil Choi,최종인,장석규 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
The effects of boronic acid on the fluoride-selective chemosignaling behavior of a merocyanine dye were investigated. In the presence of phenylboronic acid (PBA), N-methylquinolinium-based merocyanine dye displayed fluoride-selective chromogenic signaling behavior over other commonly coexisting anions in the micromolar concentration range. Signaling is produced by a fluoride-induced displacement of the dye from its complex with PBA, resulting in a significant chromogenic signal for the fluoride ion. This signaling was successfully analyzed using a ratiometric analysis of the UV-vis absorption in response to changes in fluoride ion concentration. A PBA substituted with an electron withdrawing group was found to exhibit a more pronounced signal. Polymer-bound PBA also exhibited useful fluoride-selective signaling behavior.