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저탁도시 PAC와 Ca-PAX의 입자제거 및 슬러지 탈수성 비교
심유섭,유명진,조희경,이상수,곽종운 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
This study was accomplished to evaluate the characteristics of particle removal and sludge dewatering and to find out the optimal condition of coagulation depending on the dosage of different coagulants (PAC, Ca-PAX) in low turbidity water. The experiments were carried out at a pilot plant of conventional rapid sand filtration system using artificial raw water. There was no large difference in the removal efficiencies of turbidity and total particle counts for both coagulants. However, Ca-PAX was required less than PAC to obtain the same efficiency of removal, and the initial head loss in a filter increased more fastly in case of PAC. The results on the evaluation of sludge from settling tank indicated that specific resistance of sludge was decreased inversely to the dose of both coagulant and specific resistance of Ca-PAX sludge was lower than that of PAC, therefore dewatering of sludge in case of Ca-PAX was better.
Yu, Woon-Jong,Lee, Jae-Won,Nguyen, Ngoc-Loi,Rhee, Sung-Keun,Park, Soo-Je Elsevier 2018 Systematic and applied microbiology Vol.41 No.5
<P><B>Abstract</B></P> <P>Methanotrophic bacteria are widespread and use methane as a sole carbon and energy source. They also play a crucial role in marine ecosystems by preventing the escape of methane into the atmosphere from diverse methane sources, such as methane seeps and hydrothermal vents. Despite their importance for methane carbon cycling, relatively few marine methanotrophic bacteria have been isolated and studied at the genomic level. Herein, we report the genome of a marine methanotrophic member of the genus <I>Methylomicrobium</I>, metagenome-assembled genome (MAG) wino1, which was obtained through enrichment using methane as the sole carbon source. Phylogenetic analysis based on 16S rRNA sequences and comparison of <I>pmoA</I> genes supported the close relationship of MAG-wino1 to the genus <I>Methylomicrobium</I> and it possessed a genome of 5.06 Mb encoding many specialized methanotrophic genes. A comparison of MAG-wino1 with the genomes of other strains (<I>Methylomicrobium alcaliphilum</I> 20Z<SUP>T</SUP> and <I>Methylomicrobium buryatense</I> 5G) showed that genes (e.g. <I>ectABC</I>, <I>ask</I>, and <I>mscLS</I>) involved in the accumulation of compatible solutes required for survival in marine environments might be conserved. Methane utilization genes, including methanol dehydrogenase, and key enzymes related to ribulose monophosphate (RuMP) metabolism were identified. The wino1 genome harbored nitrogen fixation, urease, urea and nitrate transporter genes involved in the exploitation of nitrogen sources. Poly-β-hydroxybutyrate degradation and glycogen synthesis-related genes may facilitate survival under nutrient-limiting conditions. Additionally, genome analysis revealed three dominant taxa in the enrichment culture, methanotroph <I>Methylomicrobium</I> sp., methylotroph <I>Methyloceanibacter</I> sp., and non-methylotroph <I>Labrenzia</I> sp., which provided insights into microbial associations in marine sediments.</P>
Characterization of L-asparaginase-producing Trichoderma spp. Isolated from Marine Environments
Yu Woon-Jong,정다운,권영민,배승섭,조은서,안혜숙,최그레이스 (사)한국해양생명과학회 2022 한국해양생명과학회지 Vol.7 No.2
L-asparaginase (ASNase) is a therapeutic enzyme used to treat acute lymphoblastic leukemia. Currently, the most widely used ASNases are originated from bacteria. However, owing to the adverse effects of bacterial ASNases, new resources for ASNase production should be explored. Fungal enzymes are considered efficient and compatible resources of natural products for diverse applications. In particular, fungal species belonging to the genus Trichoderma are well-known producers of several commercial enzymes including cellulase, chitinase, and xylanase. However, enzyme production by marine-derived Trichoderma spp. remains to be elucidated. While screening for extracellular ASNase-producing fungi from marine environments, we found four strains showing extracellular ASNase activity. Based on the morphological and phylogenetic analyses using sequences of translation elongation factor 1-alpha (tef1α), the Trichoderma isolates were identified as T. afroharzianum, T. asperellem, T. citrinoviride, and Trichoderma sp. 1. All four strains showed different ASNase activities depending on the carbon sources. T. asperellem MABIK FU00000795 showed the highest ASNase value with lactose as a carbon source. Based on our findings, we propose that marine-derived Trichoderma spp. are potential candidates for novel ASNase production.
Growth pattern and ginsenoside production of auxininduced Panax ginseng rooots
YU Kee-Won(유기원),KIM Yun-Soo(김윤수),KIM Mee Hee(김미희),CHA Ahn Hee(차안희),JEONG Jae Woon(정재운),LEE Yong Wook(이용욱),Yun Seung Rho(윤승로),Choi Sung-Mee(최성미),Park Hee-Ju(박희주),Lee Sang-Jong(이상종),Son Sung-Ho(손성호),PAE 한국원예학회 1999 원예과학기술지 Vol.17 No.2
Yu, Sang-Hun,Baek, Seung-Hak,Choi, Jin-Young,Lee, Jong-Ho,Kim, Sukwha,On, Sung-Woon The Korean Association Of Orthodontists 2021 대한치과교정학회지 Vol.51 No.1
Objective: To investigate the cephalometric predictors of the future need for orthognathic surgery in Korean patients with unilateral cleft lip and palate (UCLP) despite long-term use of facemask with miniplate (FMMP). Methods: The sample consisted of 53 UCLP patients treated by a single orthodontist using an identical protocol. Lateral cephalograms were taken before commencement of FMMP therapy (T0; mean age, 10.45 years), after FMMP therapy (T1; mean age, 14.72 years), and at follow-up (T2; mean age, 18.68 years). Twenty-eight cephalometric variables were measured. At T2 stage, the subjects were divided into FMMP-Nonsurgery (n = 33, 62.3%) and FMMP-Surgery (n = 20, 37.7%) groups according to cephalometric criteria (point A-nasion-point B [ANB] < -3°; Wits-appraisal < -5 mm; and Harvold unit difference [HUD] > 34 mm for FMMP-Surgery group). Statistical analyses including discrimination analysis were performed. Results: In FMMP-Surgery group, the forward position of the mandible at T0 stage was maintained throughout the whole stages and Class III relationship worsened with significant growth of the mandibular body and ramus and counterclockwise rotation of the maxilla and mandible at the T1 and T2 stages. Six cephalometric variables at T0 stage including ANB, anteroposterior dysplasia indicator, Wits-appraisal, mandibular body length, HUD, and overjet were selected as effective predictors of the future need for surgical intervention to correct sagittal skeletal discrepancies. Conclusions: Despite long-term use of FMMP therapy, 37.7% of UCLP patients became candidates for orthognathic surgery. Therefore, differential diagnosis is necessary to predict the future need for orthognathic surgery at early age.
Yu, Seunghee,Han, Hyeuk Jin,Kim, Jong Min,Yim, Soonmin,Sim, Dong Min,Lim, Hunhee,Lee, Jung Hye,Park, Woon Ik,Park, Jae Hong,Kim, Kwang Ho,Jung, Yeon Sik American Chemical Society 2017 ACS NANO Vol.11 No.4
<P>With the recent emergence of flexible and wearable optoelectronic devices, the achievement of sufficient bendability and stretchability of transparent and conducting electrodes (TCEs) has become an important requirement. Although metal mesh -based structures have been investigated for TCEs because of their excellent performances, the fabrication of mesh or grid structures with a submicron line width is still complex due to the requirements of laborious lithography and pattern transfer steps. Here, we introduce an extremely facile fabrication technique for metal patterns embedded in a flexible substrate based on submicron replication and an area-selective delamination (ASD) pattern. The high-yield, area-specific lift-off process is based on the principle of solvent-assisted delamination of deposited metal thin films and a mechanical triggering effect by soft wiping or ultrasonication. Our fabrication process is very simple, convenient, and cost-effective in that it does not require any lithography/etching steps or sophisticated facilities. Moreover, their outstanding optical and electrical properties (e.g., sheet resistances of 0.43 Omega sq(-1) at 94% transmittance), which are markedly superior to those of other flexible TCEs, are demonstrated. Furthermore, there is no significant change of resistance over 1000 repeated bending cycles, with a bending radius of 5 mm, and immersion in various solvents such as salt water and organic solvents. Finally, we demonstrate highperformance transparent heaters and flexible touch panels fabricated using the nanomesh electrode, confirming the longrange electrical conduction and reliability of the electrode.</P>