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Dong Bin,Zhou Guowen,Lin Yanjun,Yu Cailing,Wang Jun,Sun Chunlong,Wu Tao 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.5
Lactolisterin BU is a novel bacteriocin identified from Lactococcus lactis in 2017. It exhibits antimicrobial activity against food spoilage and foodborne pathogens. In this study, Lactolisterin BU was expressed in Pichia pastoris (P. pastoris) and isolated from the supernatant of yeast culture for the first time. It was found to exhibit a broad antimicrobial spectrum and rapid bactericidal activity against foodborne bacterial pathogens, both gram-positive and gramnegative ones, with minimum inhibition concentrations ranging within 10–60 μg/mL. The recombinant Lactolisterin BU (rLactolisterin BU) also had an antioxidant effect and was resistant to heating, acid–base, and high-dose-saline treatments and barely had any hemolytic activity or cytotoxicity. Moreover, rLactolisterin BU effectively suppressed the growth of bacterial pathogens; suppressed the increases in pH, total volatile basic nitrogen (TVB-N), and thiobarbituric acid reactive substances (TBARS) of pork samples; and maintained a high quality of fresh pork during storage at 4 ℃. Furthermore, rLactolisterin BU effectively inhibited the growth of three kinds of bacteria in a pork-spoilage model. Taken together, rLactolisterin BU could be a promising preservative for food storage.
( Dongbin Ahn ),( Kyu-yup Lee ),( Eunjung Oh ),( Minji Oh ),( Boseung Jung ),( Da Jung Jung ) 영남대학교 의과대학 2023 Yeungnam University Journal of Medicine Vol.40 No.2
Background: The study aimed to evaluate the effect of prehydration solution on hearing thresholds after cisplatin chemotherapy. Methods: In this retrospective cohort study, we reviewed the data of patients who underwent ≥3 courses of cisplatin-based chemotherapy for locally advanced head and neck cancers at a tertiary referral center (n=64). The dextrose solution (DW) group (n=26) received 2 L of normal saline and 1 L of 5% dextrose. The Hartmann solution (HS) group (n=38) received 2 L of normal saline and 1 L of HS. Hearing data were measured 1 day before starting the first course of chemotherapy, and again 20 days after the first, second, and third courses of chemotherapy. The severity of hearing loss was evaluated using the Common Terminology Criteria for Adverse Events (CTCAE). Results: Thresholds at all frequencies after chemotherapy were greater in the DW group than in the HS group. The increase in thresholds in 1 to 4 kHz after the third course of chemotherapy was greater in the DW group than in the HS group. CTCAE grades after the second and third courses of chemotherapy were greater in the DW group than in the HS group. Logistic regression showed that the odds ratio for CTCAE grade 3 or 4 after the third course of chemotherapy in the DW group was 4.84 on univariate analysis. Conclusion: Prehydration using a solution with salt was associated with a decrease in change in hearing thresholds after cisplatin chemotherapy in patients with head and neck cancers.
Terahertz field-induced phase transition via nonlinear phonon interaction
Dongbin Shin,Angel Rubio 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Light-matter interaction has been attracted attention in the field of condensed matter physics and optics from the last century. Recent studies revealed that applying terahertz (THz) field on the material can lead the enhancement of material property or induce the phase transition. For example, high temperature superconductivity (~100K) is experimentally observed by illuminating the THz-field on the K<sub>3</sub>C<sub>60</sub> from its lower superconducting critical temperature (~30K) at the ambient condition. In our work, we investigated the THz field-induced phase transition based on the first principle calculation. At first, we show the microscopic details of THz field-induced ferroeletric phase transition in SrTiO<sub>3</sub>, which is demonstrated in the recent experiment. In second, we suggest the THz field-induced Weyl points in the trivial semimetal HgTe. Especially, we revealed that the nonlinear phonon interaction is the main mechanism of these THz field-induced phase transition. Our studies highlight that THz field can be a great tool for manipulating material properties.
A Study on Evaluation of Online Trading System in MRO Supply Business
Dongbin Jeong 국제융합경영학회 2022 융합경영연구 Vol.10 No.2
Purpose: The findings are expected to be used as basic data for policy establishment for systematic support and upbringing of small and medium-sized suppliers through the current status and characteristics of the industrial structure of the MRO consumable materials industry as a whole and the market trend. Research design, data, and methodology: This survey is conducted in 2019 mainly for companies that operate consumable materials delivery business, and the survey size is about 25,000 in advance (selected) and about 2,000 in the main survey. Using cluster analysis and multidimensional scaling, we derive the visualization of the homogeneous grouping of cases and the relationship structure between them. Results: Based on the attributes of reason for not having an online trading system, it is classified into three and four clusters for industry and company size, respectively, and the feature and pattern of each individual can be are relatively evaluated and visualized. Conclusions: Small and medium-sized consumable material suppliers specialize in products rather than fierce pricing strategies or external expansion strategies and it is more effective to establish a plan to promote the growth of both large and small enterprises through cooperation with large corporations.