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Park, Jun-Gyu,Lee, Beom,Shi, Peng,Kim, Yonggeun,Jun, Hang-Bae Elsevier 2017 International journal of hydrogen energy Vol.42 No.45
<P><B>Abstract</B></P> <P>The microbial methanogenesis cell (MMC) has been studied to enhance organic removal efficiency and methane production in an anaerobic digester (AD). However, its applicability remains limited without practical approaches to scale-up the design for commercialization. Internal resistance within MMC is closely related to the transfer of hydrogen ions between electrodes. We analyzed the effects of various electrode distances and mixing velocities on the current density and methane production in a single AD equipped with an MMC. As the distance between electrodes increased from 1 cm to 5 cm, methane production and current density decreased to 51% and 92%, respectively. Although an increase in mixing velocity decreased the internal resistance, this effect was not significant below a certain distance. For larger distances, an increase in mixing velocity not only increased current density by a factor of approximately 2.5, but also enhanced methane production by a factor of approximately 1.4.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated anaerobic digesters equipped with a microbial methanogenesis cell. </LI> <LI> Effects of electrode distance and mixing velocity on performance were examined. </LI> <LI> Methane production and current density decreased with increasing electrode distance. </LI> <LI> For low electrode distance, mixing velocity had low impact on the two factors. </LI> <LI> For high electrode distance, both factors increased with mixing velocity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hung Sun Koh,Beong Kug Yang,Bae Keun Lee,Kyung Hee Jang,Davaa Bazarsad,Nam Jeong Park 한국동물분류학회 2010 Animal Systematics, Evolution and Diversity Vol.26 No.3
To identify Korean red-backed voles (Myodes regulus) from Korea by mitochondrial DNA (mtDNA) sequencing, we obtained mtDNA control region sequences of 17 red-backed voles from Korea and northeast China, and these sequences were compared with the corresponding haplotypes of Myodes obtained from GenBank. We identified five red-backed voles from Mt. Changbai and Harbin as M. rufocanus and another three redbacked voles from Harbin as M. rutilus, respectively. Moreover, nine red-backed voles from Korea, showing the average nucleotide distance of 0.66% among nine haplotypes, were different from other species of Myodes, and the average distance between nine haplotypes of red-backed voles from Korea and seven haplotypes of M. rufocanus was 6.41%, whereas the average distance between nine haplotypes of red-backed voles from Korea and five haplotypes of M. rutilus was 14.8%. We identified the red-backed voles from Korea as M. regulus, and found that M. regulus is distinct in its mtDNA control region sequences as well, although we propose further analyses with additional specimens from East Asia using nuclear and mtDNA markers to confirm the distinctness of M. regulus.
Hung Sun Koh,Mi Hyeon Yoo,Bae Geun Lee,Jeong Gyu Park 한국통합생물학회 2004 Animal cells and systems Vol.8 No.3
Sequences of cytochrome b gene and control region of mitochondrial DNA from Korean common otters (Lutra lutra lutra L.) were examined to provide the genetic information for the conservation of this subspecies. Two haplotypes and one haplotype were revealed in cytochrome b gene and control region, respectively. The available sequences of European common otter (L. l. lutra) from GenBank were compared together with those of Korean common otter in order to determine the degree of sequence variation between them. In cytochrome b gene sequences, two haplotypes from Korea and two haplotypes of Europe showed differences in 12 of 1,045 sites. The Tamura-Nei nucleotide distances between two European haplotypes was 0.10% and those between two Korean haplotypes was also 0.10%, but those between Korean haplotypes and European ones ranged from 0.96% to 1.16%. In the control region, one Korean haplotype and seven European ones showed differences in seven of 300 sites; the Tamura-Nei distances among seven European haplotypes were 0.34% to 1.01%, but those between Korean haplotype and European ones ranged from 1.01% to 1.69%. Although further molecular and morphological studies with specimens from eastern Asia including Amur region and northeast China are needed, it is possible that the Korean common otter might be closer or identical to the far-eastern Asian common otter, L. l. amurensis Dybowski.
Hang Seok Choi,Won-Seok Yang,Ji Eun Lee,Yong Chil Seo,Jang-Soo Lee,Heung-Min Yoo,Jun-Kyung Park,Se-Won Park,Ki-Bae Lee,Woo-Hyun Kim 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
The physicochemical characteristics of automobile shredder residue (ASR) and its melting slag were investigated: In particular, the applicability of ASR as a reducing agent to the black copper recovery process. ASR is classified into three types after the shredding process: heavy fluff, light fluff and glass and soil. In this study, the portions of heavy fluff, light fluff and glass and soil in the ASR were 89.2 wt%, 8.1 wt% and 2.7wt%, respectively. Physicochemical analysis revealed that moisture and fixed carbon content were low in heavy and light fluffs, and combustible content was the highest. The higher heating value (HHV) of light fluff was 6,607 kcal/kg, and the HHV of heavy fluff was 5,312 kcal/kg. To sum up, the separation of black copper and discard slag mostly seems to be affected by the melting temperature. Therefore, if basicity and melting temperature are properly controlled, the ASR can be used as a reducing agent in the smelting process of black copper recovery. Moreover, the possibility of black copper recovery from ASR and heavy metal poisoning is evaluated.
Genome-Wide Association Study of Bone Mineral Density in Korean Men
Bae, Ye Seul,Im, Sun-Wha,Kang, Mi So,Kim, Jin Hee,Lee, Soon Hang,Cho, Be Long,Park, Jin Ho,Nam, You-Seon,Son, Ho-Young,Yang, San Deok,Sung, Joohon,Oh, Kwang Ho,Yun, Jae Moon,Kim, Jong Il Korea Genome Organization 2016 Genomics & informatics Vol.14 No.2
Osteoporosis is a medical condition of global concern, with increasing incidence in both sexes. Bone mineral density (BMD), a highly heritable trait, has been proven a useful diagnostic factor in predicting fracture. Because medical information is lacking about male osteoporotic genetics, we conducted a genome-wide association study of BMD in Korean men. With 1,176 participants, we analyzed 4,414,664 single nucleotide polymorphisms (SNPs) after genomic imputation, and identified five SNPs and three loci correlated with bone density and strength. Multivariate linear regression models were applied to adjust for age and body mass index interference. Rs17124500 ($p=6.42{\times}10^{-7}$), rs34594869 ($p=6.53{\times}10^{-7}$) and rs17124504 ($p=6.53{\times}10^{-7}$) in 14q31.3 and rs140155614 ($p=8.64{\times}10^{-7}$) in 15q25.1 were significantly associated with lumbar spine BMD (LS-BMD), while rs111822233 ($p=6.35{\times}10^{-7}$) was linked with the femur total BMD (FT-BMD). Additionally, we analyzed the relationship between BMD and five genes previously identified in Korean men. Rs61382873 (p = 0.0009) in LRP5, rs9567003 (p = 0.0033) in TNFSF11 and rs9935828 (p = 0.0248) in FOXL1 were observed for LS-BMD. Furthermore, rs33997547 (p = 0.0057) in ZBTB and rs1664496 (p = 0.0012) in MEF2C were found to influence FT-BMD and rs61769193 (p = 0.0114) in ZBTB to influence femur neck BMD. We identified five SNPs and three genomic regions, associated with BMD. The significance of our results lies in the discovery of new loci, while also affirming a previously significant locus, as potential osteoporotic factors in the Korean male population.