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Fabrication and ink-jet patterning of copper nanoparticles with improved dispersion stability.
Lee, Kun-Jae,Kim, Namwoo,Hong, Sung-Jei,Lee, Kyu Bok,Lee, Dong-Jun,Oh, Je Hoon,Byun, Younghun,Choa, Yong-Ho American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>Copper (Cu) nanoparticles as the metal nanoparticles in the conductive ink were synthesized using electrochemical reaction. This method is characterized as the synthesis process without any metal salts and the post-treatment of washing and drying. It means that it does not need to consider about oxidized and agglomerated metal nanoparticles during the extra treatments. The Cu nanoparticles were synthesized in the various conditions of electrolyte to investigate the mechanism of the synthesis reaction of Cu nanoparticles. And also, the synthesized Cu nanoparticles were controlled the dispersion stability with the addition of dispersion agent such as PVP and Dextran. Finally, it was achieved the ink-jet printed Cu patterns using the synthesized Cu nanoparticles, and examined the morphology of the patterns.</P>
◇ 2분과 : 잣나무 엽록체 Simple Sequence Repeat 표지자 개발 및 특성 분석
이제완 ( Jei Wan Lee ),백승훈 ( Seung Hoon Baek ),홍경낙 ( Kyung Nak Hong ),홍용표 ( Yong Pyo Hong ),이석우 ( Seok Woo Lee ),안지영 ( Ji Young Ahn ) 한국임학회 2015 한국산림과학회지 Vol.104 No.4
본 연구에서는 잣나무 엽록체 DNA의 전체 염기서열을 기반으로 엽록체 SSR(chloroplast simple sequence repeat) 영역을 특이적으로 증폭하는 primer를 개발하고 그 특성을 분석하였다. 잣나무 엽록체 DNA에서 총 30개의 SSR 영역을 탐색하였으며, 이들 영역을 증폭하기 위한 30개의 primer를 제작하였다. 모든 primer가 잣나무를 대상으로 PCR 증폭이 가능하였다. 근연종에 대한 primer의 종간 전환률은 잣나무와 동일한 아속(Subgenus Strobus)에 속하는 눈잣나무(100%)와 섬잣나무(97%)에서 가장 높게 나타났다. 반면 소나무아속(Subgenus Pinus)에 속하는 소나무와 구주소나무에서의 종간 전환률은 73%로 비교적 낮게 나타났다. 점봉산 잣나무 집단을 대상으로 조사한 결과 13개의 유전자좌에서 다형성이 관찰되었으며, 평균 haploid 다양도(H)는 0.512로 계산되었다. 다형적 유전자좌로부터 조합된 haplotype의 수(N)는 25개로 확인되었고, haplotype 다양도(He)는 0.992로 매우 높게 나타났다. 집단내 독특하게 관찰되는 haplotype은 22개(88%)로 전체 28개체 중에서 22개체(79%)를 식별하였다. 본 연구에서 개발한 cpSSR primer는 높은 종간 전환률을 나타냄에 따라 소나무속의 근연종, 특히 잣나무아속 수종에 활용 가능성이 높고, 잣나무 유전변 이 분석을 위한 충분한 다형성을 제공하는 유용한 표지자로 판단된다. Novel cpSSR primers were developed based on the sequence information of the Pinus koraiensis chloroplast genome. A total of 30 cpSSR loci were detected in the chloroplast genome, and a total of 30 primer sets flanking those loci were designed. All primer sets were successfully amplified for chloroplast DNA in P. koraiensis. The cross-species transferability of the 30 primer sets was considerably high in P. pumila (100%) and P. paviflora (97%) belonging to the same Subgenus (Strobus) of P. koraiensis. Meanwhile, the transferability was relatively low (73%) in P. densiflora and P. sylvestris belonging to Subgenus Pinus. A total of 13 cpSSR loci out of the 30 loci were polymorphic in the Mt. Jumbong population of P. koraiensis. The mean of haploid diversity(H) was 0.512. The number of haplotypes(N) and the haplotype diversity(He) were 25 and 0.992, respectively. Of the 25 haplotypes, 22 were unique in the analyzed population. The unique haplotypes differentiated 22 individuals (79%) from the total of 28 individuals. In conclusion, the novel cpSSR primers developed in this study would be applicable to other Pinus species, especially the subgenus Strobus, and provide a high level of polymorphism for the study of genetic variation of P. koraiensis.
Synthesis and characterization of Pb(Zr_0.5Ti_0.5)O_3 nanofibers
Deuk Yong Lee,Jung-Yeon Park,Ki-Hyun Lee,Jong-Ho Kang,Young-Jei Oh,조남인 한국물리학회 2011 Current Applied Physics Vol.11 No.5
Pb(Zr_0.5Ti_0.5)O_3 (PZT) piezoelectric ceramic fibers were prepared by using electrospun PZT/poly(vinyl acetate) (PVAc) composite fibers by calcination for 1 h at the temperature range of 500 ℃―700 ℃ in air. The morphology and crystal structure of calcined PZT nanofibers were characterized as a function of calcination temperature with an aid of XRD, FT-IR, SEM, and TEM. XRD and FT-IR results revealed that pyrochlore phase began to appear after calcination at 500 ℃. For the fibers calcined at 550―600 ℃, the dominant phase of tetragonal perovskite PZT with a weak pyrochlore phase was detected. The pyrochlore and tetragonal perovskite phases coexisted for the fibers calcined at 650―700 ℃. The morphology of the fibers has changed from a smooth and uniform fiber to a porous fiber with increasing the temperature. The optimized fibers with a diameter of 334 nm were obtained when the fibers were calcined at 550 ℃.
Kwon, Jung-Hoon,Noh, Jin-Yong,Jeong, Jei-Hyun,Jeong, Sol,Lee, Sun-Hak,Kim, Yu-Jin,Yuk, Seong-Su,Lee, Dong-Hun,Bae, You-Chan,Park, Seok-Chan,Lee, Kyung-Hyun,Lee, Eun-Kyoung,Lee, Yu-Na,Lee, Youn-Jeong,S 3M Company 2019 Virology Vol.530 No.-
<P><B>Abstract</B></P> <P>H5Nx clade 2.3.4.4 highly pathogenic avian influenza viruses (HPAIVs) have been disseminated to wide geographic regions since 2014. In 2016, five distinct genotypes (C-1 to C-5) of clade 2.3.4.4c H5N6 HPAIVs were detected in South Korea. In this study, we evaluated the pathogenicity, susceptibility to infection, and transmissibility of the two strains representing the C-1 and C-4 genotypes of the H5N6 viruses, which have different PA and NS gene, in domestic ducks. Although the susceptibility to infection of domestic ducks to the two strains was similar, the C-4 genotype virus induced higher mortality in ducks than C-1 genotype virus. A higher titer of viral shedding were detected in ducks challenged with the C-4 genotype virus compared with the C-1 genotype virus. These results indicated that the reassortment of HPAIVs with prevailing low pathogenic avian influenza viruses could effect on the pathogenicity in ducks.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The two genotypes of H5N6 HPAI viruses showed different pathogenicity in ducks. </LI> <LI> The C-4 genotype virus induced higher mortality in ducks than C-1 genotype virus. </LI> <LI> The reassortment of HPAIVs could effect on the pathogenicity in ducks. </LI> </UL> </P>
문은이(Eun Yi Moon),이진(Jin Lee),이원용(Won Yong Lee),최청하(Chung Ha Choi),이덕근(Dug Keun Lee),유제만(Jei Man Ryu),정용호(Yong Ho Chung),윤성준(Sung June Yoon),박경배(Kyung Bae Park) 한국응용약물학회 1997 Biomolecules & Therapeutics(구 응용약물학회지) Vol.5 No.3
DW-166HC (^(166)Holmium (^(166)Ho)-Chitosan complex) is a new radiopharmaceutic anticancer agent with a broad anti-tumorigenic spectrum, especially against human hepatic cancer. DW-166HC was evaluated for the appearance of micronucleus in polychromatic erythrocytes (PCEs) of mouse bone marrow cells after subcutaneous arid intravenous single administration. Bone marrow cells were prepared at 24 hr and 48 hr after DW-166HC-I (^(165)Ho-Chitosan complex : cold compound) administration and at 24 hr, 72 hr and 2 weeks after DW-166HC (^(166)Ho-Chitosan complex : hot compound) administration. The results showed there was no statistically significant increase of the numbers of PCEs with micronucleus in all DW-166HC-I administered groups compared with a negative control group but there was statistically significant increase of the numbers of PCEs with micronucleus at 24 hr arid 72 hr in all DW-166HC administered groups, which was recovered after 2 weeks from the drug administration. The results also showed the ratio of normochromatic erythrocytes (NCEs) to PCEs of all DW-166HC-I administered groups was not significantly different from that of a negative controi group but there was significant difference of this ratio at 24hr and 72 hr in all DW-166HC administered groups compared with that of negative group, which was also recovered after two weeks from the drug administration. These results suggested that DW-166HC-I may not cause any chromosomal damage but DW-166HC has in vivo mutagenic potential because of its radioactivity.
( Hyo Jung Cho ),( Jung-dong Lee ),( Dae Yong Kang ),( Bohyun Kim ),( Jei Hee Lee ),( Jai Keun Kim ),( Sung Jae Shin ),( Kee Myung Lee ),( Byung Moo Yoo ),( Kwang Jae Lee ),( Soon Sun Kim ),( Jae Youn 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: This study was performed to evaluate long-term outcome of indeterminate nodules detected on cirrhotic liver and to develop risk prediction model for hepatocellular carcinoma (HCC) progression of indeterminate nodules on hepatitis B virus (HBV)-related cirrhotic liver. Methods: Indeterminate nodules up to 2 cm with uncertain malignant potential detected on cirrhotic liver during HCC surveillance were analyzed retrospectively. HCC risk prediction model of indeterminate nodules in HBV-related cirrhotic liver was deduced based on result of Cox regression analysis. Results: A total of 494 indeterminate nodules were included. Independent risk factors of HCC progression were old age, arterial enhancement, large nodule size, low serum albumin level, high serum alpha-fetoprotein (AFP) level, and prior HCC history in all included subjects. In subjects with chronic hepatitis B, old age (year; HR=1.06; P<0.001), arterial enhancement (HR=2.62; P=0.005), large nodule size (>1cm; HR=7.34; P<0.001), low serum albumin level (≤3.5g/dL; HR=3.57; P=0.001), high serum AFP level (≥100ng/mL; HR=6.04; P=0.006), prior HCC history (HR=4.24; P=0.001), and baseline HBeAg positivity (HR=2.31; P=0.007) were associated with HCC progression. We developed a simple risk prediction model using these risk factors and identified patients at low, intermediate, and high risk for HCC; 5-year cumulative incidences were 1%, 14.5%, and 63.1%, respectively. The developed risk score model showed good performance with area under the curve at 0.886 at 3 years, and 0.920 at 5 years in leave-one-out cross-validation. Conclusions: We developed useful and accurate risk score model for predicting HCC progression of indeterminate nodules detected on HBV-related cirrhotic liver.