수산화인회석에 은이 도입된 자외선차단재료

표은지 ( Eunji Pyo ),김영용 ( Youngyong Kim ),권기영 ( Ki-young Kwon ) 한국공업화학회 2016 공업화학 Vol.27 No.6

본 연구에서는 수열합성법을 이용하여 수산화인회석을 합성하였다. 또한 이온 교환 반응을 통하여 수산화인회석 표면에 은을 도입하였다. 합성된 샘플의 결정성과 형태를 X-선 회절 분석과 투과전자현미경을 통하여 분석하였으며, 산란반사 UV-vis 스펙트럼을 통하여 합성한 샘플의 광학적 특성을 조사하였다. 은이 도핑된 수산화인회석의 경우 은이 수산화인회석 표면에 나노입자 형태로 존재한다는 것을 X-선 회절 분석과 투과전자현미경 실험으로 확인하였다. 특히 수산화인회석과 비교하여 은 나노 입자가 도입된 수산화인회석의 경우에는 UV-Vis 영역에서 높은 흡광도를 나타내었다. Hydroxyapatite (HAP) was prepared by a hydrothermal synthesis method and also silver was introduced on the surface of HAP through an ion exchange reaction. The crystal phase and morphology of HAP were then evaluated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, the absorption property of HAP was characterized by diffuse reflectance UV-Vis spectroscopy. The presence of silver nanoparticles on the surface of HAP was also verified by XRD and TEM analysis. Particularly, the silver doped HAP showed an enhanced absorption property in UV-Vis region compared to that of the pristine HAP.

오일 양이 최소화된 물/오일 에멀젼을 통한 구형 마이크로 크기 실리카 합성

표은지 ( Eunji Pyo ),차연아 ( Yeona Cha ),강동균 ( Donggyun Kang ),권기영 ( Ki-young Kwon ) 한국공업화학회 2020 공업화학 Vol.31 No.6

W/O 에멀젼을 통해 구형의 실리카를 합성하는데 있어서 오일의 양을 최소화하는 연구를 수행하였다. 물유리 283 g에 오일로서 헥산을 최소한으로 20~60 mL 사용하여 구형의 실리카가 합성됨을 확인하였다. 실리카의 크기는 오일의 양에 의존하였으며, 오일의 양이 증가함에 따라서 실리카 입자의 크기가 증가하는 것을 확인하였다. 합성된 구형 실리카의 비표면적을 BET법을 통해 측정해본 결과 186~230 m²/g 값임을 확인하였다. XRF 분석으로부터 90% 이상이 SiO₂임을 확인하였으며, 물유리 사용으로 인한 나트륨이 3.27~4.5 wt. %의 불순물로 함유되어 있었다. 본 연구에서 제조한구형의 실리카는 Si의 전구체를 공업용 규산나트륨 용액을 사용함과 더불어 최소한의 헥산과 비이온계면활성제를 통하여 만들어졌기 때문에 대량 합성 및 상업화에 최적화되어 있는 조건이라고 판단된다. We prepared spherical silica by minimizing the amount of oil through water/oil (W/O) emulsion. The spherical silica was successfully synthesized by using 20 to 60 mL of hexane as an oil for 283 g of water glass. The size of silica was dependent on the amount of oil where the size of silica particles increased as the amount of oil increased. The specific surface areas of samples measured using the BET method were 186 to 230 m²/g. X-ray fluorescence (XRF) analysis results showed that the SiO₂ content was more than 90% while sodium was 3.27~4.5 wt. %. The spherical silica prepared in this study could be optimized for mass synthesis and commercialization because the industrial sodium silicate solution was used as a precursor of Si as well as the minimum amounts of hexane and nonionic surfactant were employed.

Identification and Safety Assessment of Cucumber Mosaic Virus Coat Protein in Genetically Modified Pepper (Capsicum annuum)

Eunji Kim,Hee Min Noh,Chanvorleak Phat,Gung Pyo Lee,Jun Hong Kim,Tae-Sung Park,Chan Lee 한국원예학회 2016 원예과학기술지 Vol.34 No.6

The great economic losses caused by Cucumber mosaic virus (CMV) infection of peppers has led to the development of genetically modified (GM) CMV-resistant peppers. We developed virus-resistant pepper plants using Agrobacterium tumefaciens -mediated transformation. The expressed recombinant protein was purified using nickel-nitrilotriacetic acid resin and immunoaffinity chromatography, and purity was assessed by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Immunoblot analysis revealed the purified CMV coat protein (CMV-CP) had a molecular mass of 25 kDa. After in-gel digestion and desalting, the internal peptide fragments of CMV-CP were sequenced by matrix-assisted laser desorption/ionization–time of flight. Most GM pepper and Escherichia coli BL21 internal peptides had identical peptide sequences and contained 137 of 183 whole peptides in CMV-CP. A quantitative enzyme-linked immunosorbent assay was performed to detect CMV-resistant GM peppers. We also provide basic information about the expressed protein in GM peppers for further safety assessment. The contents of soluble protein and CMV-CP were measured in GM and control peppers cultivated in three different areas of Korea. Statistical significance in terms of cultivation areas, harvest times, generations, and plant tissue origin were determined based on a P value of 0.05. The highest amount of CMV-CP was detected at the seedling stage from plant grown in each region. T3 and T5 showed significantly different levels of CMV-CP from T4 in leaves in the whorl stage. No statistical differences were observed among GM peppers at different stages of maturity in any cultivation area. The results from this study contribute to the safety evaluation of newly designed CMV-resistant GM peppers and provide a standard against which to compare other virus-resistant GM peppers.

Identification and Safety Assessment of Cucumber Mosaic Virus Coat Protein in Genetically Modified Pepper (Capsicum annuum)

Kim, Eunji,Noh, Hee Min,Phat, Chanvorleak,Lee, Gung Pyo,Kim, Jun Hong,Park, Tae-Sung,Lee, Chan Korean Society of Horticultural Science 2016 원예과학기술지 Vol.34 No.6

The great economic losses caused by Cucumber mosaic virus (CMV) infection of peppers has led to the development of genetically modified (GM) CMV-resistant peppers. We developed virus-resistant pepper plants using Agrobacterium tumefaciens -mediated transformation. The expressed recombinant protein was purified using nickel-nitrilotriacetic acid resin and immunoaffinity chromatography, and purity was assessed by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Immunoblot analysis revealed the purified CMV coat protein (CMV-CP) had a molecular mass of 25 kDa. After in-gel digestion and desalting, the internal peptide fragments of CMV-CP were sequenced by matrix-assisted laser desorption/ionization-time of flight. Most GM pepper and Escherichia coli BL21 internal peptides had identical peptide sequences and contained 137 of 183 whole peptides in CMV-CP. A quantitative enzyme-linked immunosorbent assay was performed to detect CMV-resistant GM peppers. We also provide basic information about the expressed protein in GM peppers for further safety assessment. The contents of soluble protein and CMV-CP were measured in GM and control peppers cultivated in three different areas of Korea. Statistical significance in terms of cultivation areas, harvest times, generations, and plant tissue origin were determined based on a P value of 0.05. The highest amount of CMV-CP was detected at the seedling stage from plant grown in each region. T3 and T5 showed significantly different levels of CMV-CP from T4 in leaves in the whorl stage. No statistical differences were observed among GM peppers at different stages of maturity in any cultivation area. The results from this study contribute to the safety evaluation of newly designed CMV-resistant GM peppers and provide a standard against which to compare other virus-resistant GM peppers.

Enhanced Photocatalytic Property of TiO2 Treated with H2 at Ambient Pressure

Youngyong Kim,Eunji Pyo,Geunyoung Lee,Ki-Young Kwon 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.12

Extended absorption of TiO2 in visible light by the treatment of hydrogen gas at amient pressure

Intranasal Immunization With an Attenuated pep27 Mutant Provides Protection From Influenza Virus and Secondary Pneumococcal Infections

Seon, Seung Han,Choi, Jung Ah,Yang, Eunji,Pyo, Sukneung,Song, Man Ki,Rhee, Dong-Kwon Oxford University Press 2018 The Journal of infectious diseases Vol.217 No.4

<P>During influenza pandemics, secondary pneumococcal infections cause excessive mortality. However, the current 13-valent pneumococcal conjugate vaccine, PCV13, provides only limited protection against secondary infection. Therefore, a more effective pneumococcal vaccine is required to protect against secondary pneumococcal infections. Here, intranasal immunization with an attenuated pneumococcal pep27 mutant provides protection from influenza virus infection, and also from secondary pneumococcal challenge. These results indicate that mucosal immunity might be an effective way to reduce the morbidity and mortality due to secondary pneumococcal infections during influenza pandemics.</P>

Clinicopathological features of diabetic and nondiabetic renal diseases in type 2 diabetic patients with nephrotic-range proteinuria

Lee, Yu Ho,Kim, Ki-Pyo,Kim, Yang Gyun,Moon, Ju-Young,Jung, Su Woong,Park, Eunji,Kim, Jin Sug,Jeong, Kyung-Hwan,Lee, Tae Won,Ihm, Chun-Gyoo,Jo, Young-Il,Choi, Hoon-Young,Park, Hyeong-Cheon,Lee, So-Youn Williams & Wilkins Co 2017 Medicine Vol.96 No.36

<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>Heavy proteinuria with or without features of nephrotic syndrome is associated with many primary and systemic diseases. For diabetic patients, distinguishing nondiabetic renal disease (NDRD) from diabetic nephropathy (DN) is important in choosing treatment modalities and determining renal prognosis. However, clinical relevance of heavy proteinuria is inconsistent with clinical DN assessments. This study investigated the clinicopathological features and renal outcomes of DN and NDRD in type 2 diabetic patients with nephrotic-range proteinuria.</P><P>We enrolled 220 cases of type 2 diabetic patients who underwent renal biopsy. They were grouped according to the presence of nephritic-range proteinuria and pathological features. Baseline characteristics, laboratory findings, types of pathological diagnosis, and renal outcomes were analyzed in patients with heavy proteinuria.</P><P>Upon kidney biopsy, 129 patients (58.6%) showed nephritic-range proteinuria. Patients with heavy proteinuria (an average urine protein-to-creatinine ratio of 10,008 ± 7307 mg/gCr) showed lower serum albumin levels and higher total cholesterol levels, but did not show any difference in age, duration of diabetes, renal function, or the presence of retinopathy compared with those with mild-to-moderate proteinuria (an average urine protein-to-creatinine ratio of 1581 ± 979 mg/gCr). Renal biopsy revealed that the prevalence of NDRD was 37.2% in patients with heavy proteinuria, which was significantly lower than that in patients with mild-to-moderate proteinuria (63.7%). The most common pathological types of NDRD were membranous nephropathy (41.7%), IgA nephropathy (14.6%), and minimal change disease (10.4%). NDRD patients showed lower prevalence of diabetic retinopathy and better kidney function irrespective of proteinuria. Immunosuppressive treatment was administered more frequently in patients with heavy proteinuria (56.3%) compared with patients with mild-to-moderate proteinuria (20%) because of the pathological differences according to the amount of proteinuria. Renal outcomes were significantly worse in patients with DN than in patients with NDRD.</P><P>DN patients with heavy proteinuria exhibited different prevalence of NDRD and worse prognosis. Renal biopsy in type 2 diabetic patients should be more extensively considered to accurately diagnose NDRD, guide further management, and predict renal outcomes, especially in patients with nephrotic-range proteinuria.</P></▼2>

글루탐산 생산을 위한 Lactococcus lactis HY7803 균주의 대두 발효 적용

Lee Jungmin,Heo Sojeong,Choi Jihoon,Pyo Eunji,Lee Myounghee,Shin Sangick,Lee Jaehwan,Lee Junglyoul,정도원 한국미생물·생명공학회 2023 한국미생물·생명공학회지 Vol.51 No.1

The glutamic acid producing strain for development savory taste enhancing foods was identified the possibility through application into soybean fermentation. To check the effects on glutamic acid production during soybean fermentation, Lactococcus lactis HY7803 was introduced as a starter. The soybean samples were analyzed on days 0, 7, 14 and 21. The numbers of bacteria decreased gradually, while the content of amino-type nitrogen increased during fermentation in the soybean with L. lactis HY7803. Glutamic acid content in soybeans with L. lactis HY7803 increased from 114.99 ± 9.37 pmol/ul on day 0 to 138.14 ± 1.76 pmol/ul on day 21, showing an overall higher amino acid content than soybeans without L. lactis HY7803 and similar content to soybeans with Aspergillus oryzae SNU-G. It was clearly distinguished through principal component analysis. Consequently, our results indicate that L. lactis HY7803 is available as a fungus replacement and may be a good starter strain for enhancing savory taste in vitro as well as soybean fermentation.

Selection of Lactococcus lactis HY7803 for Glutamic Acid Production Based on Comparative Genomic Analysis

( Jungmin Lee ),( Sojeong Heo ),( Jihoon Choi ),( Minsoo Kim ),( Eunji Pyo ),( Myounghee Lee ),( Sangick Shin ),( Jaehwan Lee ),( Jaehun Sim ),( Do-won Jeong ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.2

Comparative genomic analysis was performed on eight species of lactic acid bacteria (LAB)― Lactococcus (L.) lactis, Lactobacillus (Lb.) plantarum, Lb. casei, Lb. brevis, Leuconostoc (Leu.) mesenteroides, Lb. fermentum, Lb. buchneri, and Lb. curvatus―to assess their glutamic acid production pathways. Glutamic acid is important for umami taste in foods. The only genes for glutamic acid production identified in the eight LAB were for conversion from glutamine in L. lactis and Leu. mesenteroides, and from glucose via citrate in L. lactis. Thus, L. lactis was considered to be potentially the best of the species for glutamic acid production. By biochemical analyses, L. lactis HY7803 was selected for glutamic acid production from among 17 L. lactis strains. Strain HY7803 produced 83.16 pmol/μl glutamic acid from glucose, and exogenous supplementation of citrate increased this to 108.42 pmol/μl. Including glutamic acid, strain HY7803 produced more of 10 free amino acids than L. lactis reference strains IL1403 and ATCC 7962 in the presence of exogenous citrate. The differences in the amino acid profiles of the strains were illuminated by principal component analysis. Our results indicate that L. lactis HY7803 may be a good starter strain for glutamic acid production.

Identification of Epithelial-Mesenchymal Transition-related Target Genes Induced by the Mutation of Smad3 Linker Phosphorylation

Park, Sujin,Yang, Kyung-Min,Park, Yuna,Hong, Eunji,Hong, Chang Pyo,Park, Jinah,Pang, Kyoungwha,Lee, Jihee,Park, Bora,Lee, Siyoung,An, Haein,Kwak, Mi-Kyung,Kim, Junil,Kang, Jin Muk,Kim, Pyunggang,Xiao, Korean Society of Cancer Prevention 2018 Journal of cancer prevention Vol.23 No.1

<P><B>Background</B></P><P>Smad3 linker phosphorylation plays essential roles in tumor progression and metastasis. We have previously reported that the mutation of Smad3 linker phosphorylation sites (Smad3-Erk/Pro-directed kinase site mutant constructs [EPSM]) markedly reduced the tumor progression while increasing the lung metastasis in breast cancer.</P><P><B>Methods</B></P><P>We performed high-throughput RNA-Sequencing of the human prostate cancer cell lines infected with adenoviral Smad3-EPSM to identify the genes regulated by Smad3-EPSM.</P><P><B>Results</B></P><P>In this study, we identified genes which are differentially regulated in the presence of Smad3-EPSM. We first confirmed that Smad3-EPSM strongly enhanced a capability of cell motility and invasiveness as well as the expression of epithelial-mesenchymal transition marker genes, <I>CDH2</I>, <I>SNAI1</I>, and <I>ZEB1</I> in response to TGF-β1 in human pancreatic and prostate cancer cell lines. We identified <I>GADD45B</I>, <I>CTGF</I>, and <I>JUNB</I> genes in the expression profiles associated with cell motility and invasiveness induced by the Smad3-EPSM.</P><P><B>Conclusions</B></P><P>These results suggested that inhibition of Smad3 linker phosphorylation may enhance cell motility and invasiveness by inducing expression of <I>GADD45B</I>, <I>CTGF</I>, and <I>JUNB</I> genes in various cancers.</P>