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Seoyoung Lee,Seunghyun Lee,Hyunjin Jo,Sangki Bae,Kimin Kim,Jiho Song,Younghwan Cho,Jinsung Kim,안형수,양민 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.10
The growth temperature dependence of self-aligned -Ga2O3 nanostructures grown on an rplane sapphire substrate by using metal-organic chemical vapor deposition is reported. Periodic self-alignment of the -Ga2O3 grains was observed for certain growth temperature windows and the grain size of the -Ga2O3 structure varied in response to the growth temperature. At temperatures under 800 C, self-alignment of the -Ga2O3 structures was not observed. The self-alignment tendency began to appear at 900 C, and obvious self-alignment characteristics in a certain direction were observed at approximately 950 C. However, as the growth temperature was increased to more than 900 C the growth mode of the -Ga2O3 structure gradually deviated from the self-alignment mode, finally exhibiting a two-dimensional thin film mode at 1100 C. We surmise that the driving force of -Ga2O3 grain self-alignment is the surface-potential difference between the planar and the step regions of the substrate on an atomic scale, which originates from misorientation occurring during the r-plane sapphire cutting process.
Lee, Seoyoung,Lee, Seunghyun,Jo, Hyunjin,Bae, Sangki,Kim, Kimin,Song, Jiho,Cho, Younghwan,Kim, Jinsung,Ahn, Hyungsoo,Yang, Min 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>The growth temperature dependence of self-aligned beta-Ga2O3 nanostructures grown on an r-plane sapphire substrate by using metal-organic chemical vapor deposition is reported. Periodic self-alignment of the beta-Ga2O3 grains was observed for certain growth temperature windows and the grain size of the beta-Ga2O3 structure varied in response to the growth temperature. At temperatures under 800 A degrees C, self-alignment of the beta-Ga2O3 structures was not observed. The self-alignment tendency began to appear at 900 A degrees C, and obvious self-alignment characteristics in a certain direction were observed at approximately 950 A degrees C. However, as the growth temperature was increased to more than 900 A degrees C the growth mode of the beta-Ga2O3 structure gradually deviated from the self-alignment mode, finally exhibiting a two-dimensional thin film mode at 1100 A degrees C. We surmise that the driving force of beta-Ga2O3 grain self-alignment is the surface-potential difference between the planar and the step regions of the substrate on an atomic scale, which originates from misorientation occurring during the r-plane sapphire cutting process.</P>
박윤정,차재호,Bongkeun Song,Yan Huang,Seoyoung Kim,김수현,Eunhye Jo,Samantha Fortin,안순모 한국해양과학기술원 2020 Ocean science journal Vol.55 No.1
We examined the effects of changing from oxic to anoxic conditions on microbial communities using both biogeochemical and molecular approaches in a semi-enclosed estuary (Jinhae Bay, Republic of Korea). Total microbial activity, represented by oxygen demand in the water column (WOD) or sediment (SOD), revealed that the respective microbial communities in the water and sediment responded differently to low dissolved-oxygen (DO) conditions. In the sediment, SOD and the total microbial abundance, as assessed by quantitative polymerase chain reaction (qPCR) analysis, decreased under low DO conditions, indicating that the microbial adaptation to anaerobic metabolism was not well established during hypoxia development. In the water column, however, neither the total abundance of microbes nor the WOD were affected by hypoxic conditions. Regardless of DO concentration, WOD showed a positive correlation with water temperature, implying that the aerobic metabolism was sustained even under hypoxic conditions, through the intermittent supply of oxygen. In addition to the spatially different responses of microorganisms, unique responses of specific groups were noted in sulfur (S) cycling microbes. Sulfide-oxidizing prokaryotes (SOP) dominated in the water column, and no significant changes were evident in their abundance or diversity with hypoxia. However, in sediment, distinctive sulfate-reducing bacteria (SRB) were present at each sampling period during hypoxia development (a “SRB succession”), implying that each SRB group has varying sensitivity to DO and other electron acceptors. Vertical profiles of dissolved inorganic nitrogen, including ammonium (NH4 +) and nitrate (NO3 −), and changes in archaeal abundance suggest that NH4 +-oxidizing archaea (AOA) might vary spatially and temporally, depending on NH4 + and oxygen availability in the water column, under mature hypoxic conditions, which is similar to the nitrogen (N) dynamics in the permanent oxygen minimum zone (OMZ).
Park, Inwon,Lee, Jae Hyuk,Jang, Dong-Hyun,Kim, Joonghee,Hwang, Bo Rah,Kim, Seoyoung,Lee, Ji Eun,Jo, You Hwan Elsevier 2020 Clinical nutrition Vol.39 No.6
<P><B>Summary</B></P> <P><B>Background & aims</B></P> <P>Although initial fluid resuscitation in sepsis is critical for the treatment of tissue hypoperfusion, little evidence supports the distribution of infused fluid in patients with sepsis. This study was designed to assess the body water distribution in patients with sepsis using bioelectrical impedance analysis and correlate the trend in body water distribution during fluid treatment with the prognosis of patients with sepsis.</P> <P><B>Methods</B></P> <P>A prospective study in a single emergency department was performed, and adult patients suspected of having sepsis were enrolled. Multi-frequency direct segmental bioelectrical impedance analysis (InBody S10, InBody) measuring total body water (TBW), intracellular water (ICW), and extracellular water (ECW) was applied to patients with sepsis at three periods: before, immediately after, and 1 hour after the fluid treatment. Survival data at 28 days after the fluid treatment were obtained.</P> <P><B>Results</B></P> <P>Forty-two patients were enrolled in this study. Overall, the ratios of TBW, ICW, and ECW to body weight increased throughout the fluid treatment except the ratio of ICW to body weight at 1 hour in non-survivors. While the ratio of ECW to TBW (ECW/TBW) and the ratio of ICW to TBW (ICW/TBW) in survivors remained stable over the period, the trend of ECW/TBW increased with corresponding decline of ICW/TBW in non-survivors (p = 0.0085 and p = 0.0034 between times and groups, respectively) such that ECW/TBW and ICW/TBW were significantly different at 1 hour after the fluid loading period (p = 0.0120 and p = 0.0085, respectively). This contrast pattern was equivalent with the trend of ECW/TBW in trunk but not that of the other extremities.</P> <P><B>Conclusions</B></P> <P>During fluid resuscitation, the trend in ECW/TBW significantly increased with corresponding decrease of ICW/TBW in non-survivors compared with that in survivors, which suggests fluid resuscitation results intracellular dehydration and extracellular edema in non-survivors of patients with sepsis.</P>