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Park, Seonghwan,Kim, Jeongmi,Park, Younghyun,Son, Suyoung,Cho, Sunja,Kim, Changwon,Lee, Taeho Elsevier 2017 Bioresource technology Vol.234 No.-
<P><B>Abstract</B></P> <P>Two competitive strategies, fed-batch and sequencing-batch cultivation, were compared in cost-effective biomass production of a high lipid microalgae, <I>Micractinium inermum</I> NLP-F014 using a blended wastewater medium. For fed-batch cultivations, additional nutrient was supplemented at day 2 (FB1) or consecutively added at day 2 and 4 (FB2). Through inoculum size test, 1.0g-DCWL<SUP>−1</SUP> was selected for the sequencing-batch cultivation (SB) where about 65% of culture was replaced with fresh medium every 2days. Both fed-batch cultivations showed the maximum biomass productivity of 0.95g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>, while average biomass productivity in SB was slightly higher as 0.96±0.08g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>. Furthermore, remained concentrations of organics (426mg-CODL<SUP>−1</SUP>), total nitrogen (15.4mg-NL<SUP>−1</SUP>) and phosphorus (0.6mg-PL<SUP>−1</SUP>) in SB were much lower than those of fed-batch conditions. The results suggested that SB could be a promising strategy to cultivate <I>M. inermum</I> NLP-F014 with the blended wastewater medium.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A valuable strategy for cost-effective production of <I>M. inermum</I> was determined. </LI> <LI> Two batch cultivation strategies, fed-batch and sequencing-batch mode, were tested. </LI> <LI> Culture medium was a mixture of domestic WW and aerobically digested swine WW. </LI> <LI> The highest biomass productivity was obtained from the sequencing-batch mode. </LI> <LI> The sequencing-batch mode also showed low environmental impacts. </LI> </UL> </P>
Park, Younghyun,Park, Seonghwan,Nguyen, Van Khanh,Yu, Jaecheul,Torres, Cé,sar I.,Rittmann, Bruce E.,Lee, Taeho Elsevier 2017 Chemical engineering journal Vol.316 No.-
<P><B>Abstract</B></P> <P>Microbial fuel cells (MFCs) can treat organic compounds from domestic wastewater without aeration, but an additional procedure is required to remove nitrogen. This study developed a flat-panel air-cathode MFC (FA-MFC) that was comprised of five MFC units connected in series and operated to remove organic and nitrogen compounds from domestic wastewater with a short hydraulic retention time (HRT) of 2.5h. During eight months of operation, the removal efficiencies of chemical oxygen demand (COD) and total nitrogen (TN) increased, reaching 85% and 94%, respectively, and the effluent COD and TN concentrations were 20.7±2.5mg/L and 1.7±0.1mg/L, respectively. The greatest removals of COD and TN were in the first and second unit (0.62kg-N/m<SUP>3</SUP>/d of TN removal rate). The FA-MFC system allowed simultaneous removals of COD and TN from domestic wastewater, although it led to minimal power output (6.3W/m<SUP>3</SUP> in the first unit). Because any abiotic ammonia loss was not found under the supplied potential of∼1.1V at a short HRT of 30min, the biological nitrogen removal was thought as a dominant mechanism for TN removal in the FA-MFCs. Microbial community analysis revealed that, near the cathode, <I>Nitrosomonas</I>-like strains contributed to nitrification and <I>Nitratireductor</I>-like strains led to denitrification. <I>Acidovorax</I>-like strains, known for their metabolic diversity, were ubiquitous and appeared to contribute to organics and nitrogen removal in anode and cathode biofilms. This study provides proof of concept that the FA-MFC system has a promise for energy sustainable wastewater treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FA-MFC system for domestic wastewater treatment was operated during 8months. </LI> <LI> FA-MFCs could successfully satisfy COD and TN discharge limits at an HRT of∼2.5h. </LI> <LI> FA-MFC system showed a significantly high TN removal rate up to 0.62kg-N/m<SUP>3</SUP>/d. </LI> <LI> <I>Nitrosomonas</I>, <I>Nitratireductor</I> and <I>Acidovorax</I> spp. contributed to nitrogen removal. </LI> <LI> FA-MFC system has a promise for energy-sustainable domestic wastewater treatment. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Younghyun,Cho, Hyunwoo,Yu, Jaechul,Min, Booki,Kim, Hong Suck,Kim, Byung Goon,Lee, Taeho Elsevier 2017 Bioresource technology Vol.233 No.-
<P><B>Abstract</B></P> <P>Microbial community structures and performance of air-cathode microbial fuel cells (MFCs) inoculated with activated sludge from domestic wastewater were investigated to evaluate the effects of three substrate pre-acclimation strategies: 1, serial pre-acclimation with acetate and glucose before supplying domestic wastewater; 2, one step pre-acclimation with acetate before supplying domestic wastewater; and 3, direct supply of domestic wastewater without any pre-acclimation. Strategy 1 showed much higher current generation (1.4mA) and Coulombic efficiency (33.5%) than strategies 2 (0.7mA and 9.4%) and 3 (0.9mA and 10.3%). Pyrosequencing showed that microbial communities were significantly affected by pre-acclimation strategy. Although <I>Proteobacteria</I> was the dominant phylum with all strategies, <I>Actinobacteria</I> was abundant when MFCs were pre-acclimated with glucose after acetate. Not only anode-respiring bacteria (ARB) in the genus <I>Geobacter</I> but also non-ARB belonging to the family <I>Anaerolinaceae</I> seemed to play important roles in air-cathode MFCs to produce electricity from domestic wastewater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Three strategies were applied for substrate pre-acclimation of air-cathode MFCs. </LI> <LI> Serial pre-acclimation with acetate-glucose produced higher current from wastewater. </LI> <LI> Microbial communities were significantly varied by pre-acclimation strategies. </LI> <LI> <I>Anaerolinaceae</I> seemed to play important roles in MFCs using domestic wastewater. </LI> </UL> </P>
Park, Younghyun,Park, Seonghwan,Nguyen, Van Khanh,Kim, Jung Rae,Kim, Hong Suck,Kim, Byung Goon,Yu, Jaecheul,Lee, Taeho Elsevier 2017 Bioresource technology Vol.226 No.-
<P><B>Abstract</B></P> <P>In order to confirm the effects of the low conductivity and biodegradability of wastewater, flat-panel air-cathode microbial fuel cells (FA-MFCs) were operated by supplying substrates with different volume ratios of domestic wastewater mixed with an artificial medium: the artificial medium only, 25% wastewater, 50% wastewater, 75% wastewater, 100% of wastewater with 500mg-COD/L by adding acetate, and raw domestic wastewater (230mg-COD/L). With the increase of wastewater ratio, the maximum power density and organic removal efficiency decreased from 187 to 60W/m<SUP>3</SUP> and 51.5 to 37.4%, respectively, but the Coulombic efficiency was maintained in the range of 18.0–18.9%. The FA-MFCs could maintain their low internal resistances and overcome the decreasing conductivity. The acetate concentration was more important than the total organics for power production. This study suggests that the FA-MFC configuration has great applicability for practical applications when supplied by domestic wastewater with low conductivity and biodegradability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FA-MFCs were operated by substrate transition from acetate to domestic wastewater. </LI> <LI> Coulombic efficiency in acetate was similar to that in domestic wastewater. </LI> <LI> Maximum power density had higher correlation with acetate than with COD. </LI> <LI> FA-MFCs could maintain low internal resistance and overcome decreasing conductivity. </LI> </UL> </P>
Park, Younghyun,Nguyen, Van Khanh,Park, Seonghwan,Yu, Jaecheul,Lee, Taeho Elsevier 2018 Bioresource technology Vol.258 No.-
<P><B>Abstract</B></P> <P>A flat-panel air-cathode microbial fuel cell (FA-MFC) is known to overcome the low conductivity and biodegradability of domestic wastewater. This study evaluated the normalized energy recovery (NER) based on the volume of wastewater treated (NER<SUB>V</SUB>) and chemical oxygen demand (COD) removal (NER<SUB>COD</SUB>) using FA-MFCs with three anode spacing conditions and different flow rates (within a hydraulic retention time of 30 min). Generation of current was similar (11.7 ± 0.5 mA) at different spacings; however, COD removal was affected by the flow rates. The NER<SUB>V</SUB> for both acetate and domestic wastewater showed good agreements with the flow rates in all anode spacing conditions. The NER<SUB>COD</SUB> results were negatively correlated with the COD removal rates, independent of the anode spacing. The FA-MFCs yielded an NER<SUB>COD</SUB> of 0.22 kWh/kg-COD from extremely low-strength domestic wastewater (150 mg-COD/L). The FA-MFC has a significant potential as an energy-sustainable wastewater treatment technology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The FA-MFC with shortest anode spacing produced the highest electrical energy. </LI> <LI> NER<SUB>V</SUB> showed a negative correlation with flow rate in all anode spacings. </LI> <LI> NER<SUB>COD</SUB> was correlated with COD removal rate, independent of anode spacing. </LI> <LI> The FA-MFC has a great potential to recover energy from low-strength wastewater. </LI> </UL> </P>
Younghyun Park,Joonseong Jang,Dongju Lee,Michung Yoon 대한의생명과학회 2018 Biomedical Science Letters Vol.24 No.4
Vitamin C (ascorbic acid) supplementation has been suggested to negatively correlate with obesity in humans and other animals. Previous studies, including ours, have demonstrated that a high-fat diet (HFD) induces obesity and related diseases such as hyperlipidemia, hyperglycemia, insulin resistance, and nonalcoholic fatty liver disease. Here, we investigated the effects of vitamin C on visceral adipocyte hypertrophy and glucose intolerance in C57BL/6J mice. Mice received a low-fat diet (LFD, 10% kcal fat), HFD (45% kcal fat), or the same HFD supplemented with vitamin C (HFD-VC, 1% w/w) for 15 weeks. Visceral adiposity and glucose intolerance were examined using metabolic measurements, histology, and gene expression analyses. Mice in the HFD-VC supplementation group had reduced body weight, mesenteric fat mass, and mesenteric adipocyte size compared with HFD-fed mice. Vitamin C intake in obese mice also decreased the mRNA levels of lipogenesis-related genes (i.e., stearoyl-CoA desaturase 1 and sterol regulatory element-binding protein 1c) in mesenteric adipose tissues, inhibited hyperglycemia, and improved glucose tolerance. In addition, vitamin C attenuated the HFD-induced increase in the size of pancreatic islets. These results suggest that vitamin C suppresses HFD-induced visceral adipocyte hypertrophy and glucose intolerance in part by decreasing the visceral adipose expression of genes involved in lipogenesis.
단보 : Aspergillus flavus Y2H001의 식물생육촉진과 Gibberellin A3의 생산
유영현 ( Younghyun You ),박종명 ( Jongmyong Park ),강상모 ( Sangmo Kang ),박종한 ( Jonghan Park ),이인중 ( Injung Lee ),김종국 ( Jongguk Kim ) 한국균학회 2015 韓國菌學會誌 Vol.43 No.3
Perilla frutescens var. japonica Hara was collected from farmland in Seongju-gun. Fifteen endophytic fungal strains with different colony morphologies were isolated from roots of P. frutescens. Waito-c rice seedlings were treated with the concentrated culture filtrates (CF) of endophytic fungi for observation of their plant growth-promoting activities. In the results, the CF of Y2H001 fungal strain promoted the growth of the waito-c rice seedlings. The phylogenetic tree of Y2H001 strain was analyzed by the combined sequences of the partial internal transcribed spacer region (ITS) and partial betatubulin gene. Molecular and morphological studies identified the Y2H001 strain as belonging to Aspergillus flavus. In gas chromatography mass spectrometry (GC/MS) analysis of the CF of Y2H001 strain, gibberellic acid (GA) was detected and quantified. Therefore, we describe Y2H001 strain as a new GA3-producing A. flavus based on morphological, molecular characteristics and analysis of secondary metabolite.