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Jiyoon Choi,Jiwon Baek,Daehyuk Kweon,Kwan Soo Ko,Hyunjin Yoon 한국미생물학회 2020 The journal of microbiology Vol.58 No.5
Carbapenems are a class of β-lactam antibiotics with a broad antimicrobial activity spectrum. Owing to their sturdy structures resistant to most β-lactamases, they have been regarded as one of the last-resort antibiotics for combating multidrugresistant bacterial infections. However, the emergence of carbapenem resistance increases predominantly in nosocomial pathogens. To prevent spread of carbapenem resistance in early stages, it is imperative to develop rapid diagnostic tests that will substantially reduce the time and cost in determining carbapenem resistance. Thus, we devised a staining-based diagnostic method applicable to three different Gram-negative pathogens of Acinetobacter baumannii, Escherichia coli, and Klebsiella pneumoniae, all with the high potential to develop carbapenem resistance. Regardless of the resistance mechanisms presented by bacterial species and strains, double staining with propidium iodide (PI) and alamar blue (AB) identified resistant bacteria with an average sensitivity of 95.35%, 7 h after imipenem treatments in 343 clinical isolates. Among the three species tested, A. baumannii showed the highest diagnostic sensitivity of 98.46%. The PI and ABmediated staining method could be a promising diagnostic method with high-throughput efficacy and low cost.
Jeon, Jiyoon,Nam, Seongju,Ko, Chang Hyun Elsevier 2018 CATALYSIS TODAY - Vol.309 No.-
<P><B>Abstract</B></P> <P>The formation and subsequent accumulation of coke is one of the major reasons for the catalyst deactivation in methane reforming reaction. Although the investigation of coke-resistant catalysts is closely related to their long-term stability of given catalysts, it takes a long time to quantitatively measure the amount of carbon deposition on catalysts under normal reaction operational conditions. To overcome this problem, we used the steam deficient reaction condition, i.e. a low steam-to-carbon ratio (S/C) of 0.5 to accelerate the carbon deposition on catalysts. In this condition, the base catalyst of 10wt.% Ni/alumina rapidly lost its catalytic activity, indicating fast coke deposition. However, adding proper additives, such as Ru among various precious metals (Ru, Rh, Pt, and Pd) and alkaline earth metals (Mg, Ca, Sr, and Ba) with the appropriate loading (5wt.%) effectively suppressed coke formation. The optimized catalyst composition is 0.5wt.% Ru/5wt.% Mg/10wt.% Ni/alumina, which displayed coke resistance in the long-term stability test of steam methane reforming and 40h test of dry reforming of methane. These experimental results indicate that the method developed in this study is useful for the rapid evaluation of given catalysts for their coke resistance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of steam-to-carbon ratio on coke formation during methane reforming studied. </LI> <LI> Coke formation measured within 5h using low steam-to-carbon ratio and high WHSV. </LI> <LI> Quick development of Ru-Mg catalysts with high coke resistance. </LI> <LI> Long-term stability for both steam and dry methane reforming demonstrated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Association of Maternal Diabetes with Neonatal Outcomes of Very Low Birth Weight Infants
( Jee In Song ),( Euiseok Jung ),( Moonyeon Oh ),( Jiyoon Jeong ),( Teahyen Cha ),( Seunghyun Ko ),( Byong Sop Lee ),( Ellen Ai-rhan Kim ),( Ki-soo Kim ) 대한주산의학회 2021 Perinatology Vol.32 No.4
Objective: Women with diabetes mellitus (DM) are at high risk for preterm delivery. However, reported findings on the effects of maternal diabetes on the outcome of very low birth weight infants (VLBWIs) are inconsistent. This study compared the mortality and morbidity among VLBWIs born to women with and without DM. Methods: In this retrospective cohort study, we included data on VLBWI without congenital malformations born between April 2013 and September 2020. Neonatal outcomes according to maternal diabetes, type of diabetes, and maternal insulin treatment were compared using multivariate logistic analysis. Results: Of 756 infants, 61 were born to women with DM. Of these 61 mothers, 55 had gestational DM, while 6 had pregestational DM. After adjusting for confounders, it was observed that VLBWI born to women with diabetes were less likely to develop sepsis. The risk of grade 3 or 4 intraventricular hemorrhage (IVH) was higher in the insulin-requiring DM group. There was no significant difference in the mortality of VLBWI under any maternal condition. Conclusion: Maternal diabetes lowers the prevalence of sepsis in VLBWI, which is particularly augmented in the insulin-requiring DM group. However, maternal insulin treatment increases the incidence of severe IVH in VLBWI.
Early Start of Dialysis Has No Survival Benefit in End-Stage Renal Disease Patients
Chang, Jae Hyun,Rim, Min Young,Sung, Jiyoon,Ko, Kwang-Pil,Kim, Dong Ki,Jung, Ji Yong,Lee, Hyun Hee,Chung, Wookyung,Kim, Sejoong The Korean Academy of Medical Sciences 2012 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.27 No.10
<P>The timing for dialysis initiationis still debated. The aim of this study was to compare mortality rates, using a propensity-score approach, in dialysis patients with early or late starts. From January 2000 to June 2009, incident adult patients (n = 836) starting dialysis for end-stage renal disease (ESRD) were enrolled. The patients were assigned to either an early- or late-start group depending on the initiation time of the dialysis. After propensity-score-basedmatching, 450 patients remained. At the initiation of dialysis, the mean estimated glomerular filtration rate (eGFR) was 11.1 mL/min/1.73 m<SUP>2</SUP> in the early-start group compared with 6.1 mL/min/1.73 m<SUP>2</SUP> in the late-start group. There were no significant differences in survival between the patients in the early- and late-start groups (Log rank tests <I>P</I> = 0.172). A higher overall mortality risk was observed in the early-start group than in the late-start group for the patients aged ≥ 70 yr (hazard ratio [HR]: 3.29; <I>P</I> = 0.048) and/or who had albumin levels ≥ 3.5 g/dL (HR: 2.53; <I>P</I> = 0.046). The survival of the ESRD patients was comparable between the patients in the early and late-start groups. The time to initiate dialysis should be determined based on clinical findings as well as the eGFR.</P>