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KIM, YOUNGHOON,OH, SANGNAM,AHN, EUN YOUNG,IMM, JEE-YOUNG,OH, SEJONG,PARK, SUNGSU,KIM, SAE HUN ational Association for Food Protection 2007 Journal of food protection Vol.70 No.2
<P>Many pathogenic bacteria, including Escherichia coli O157:H7, can control gene expression in a cell density-dependent manner by producing small signaling molecules (autoinducers) in a process known as quorum sensing. In this study, the effects of the autoinducer-2-like activity on the expression of proteins, including virulence factors, in E. coli O157:H7 were characterized by proteomic analysis. Compared with the control, E. coli O157:H7 strains in the presence of autoinducer-2-like activity exhibited elevated virulence by more rapidly forming cell aggregates on epithelial cells and rapidly killing the nematode Caenorhabditis elegans, the surrogate host. Two-dimensional gel electrophoresis revealed 18 proteins that were upregulated by autoinducer-2-like activity and 4 proteins that were down-regulated. These proteins were further characterized by matrix-assisted laser desorption-ionization time-of-flight mass spectrometry and are involved in the metabolic process, adaptation and protection, cell motility, secretion, envelope biogenesis, and protein translation. These results indicate that the newly identified proteins are associated with the control of virulence in E. coli O157:H7 and that these proteins can be potential targets for the development of antibiotics and other antimicrobial agents.</P>
ECBM(Extended Clause Bit Matrix)을 이용한 추론엔진 설계
오명륜(Myeongryoon Oh),오광진(Kwangjin Oh),전근환(Keunhwan Jeon),이양원(Yangweon Rhee),류근호(Keunho Ryu),김영훈(Younghoon Kim) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1B
전문가시스템은 추론엔진, 지식베이스를 기반으로 사용목적에 맞게 구성된다. 전문가 시스템의 궁극적 목표는 인간의 사고 방식을 모방한 컴퓨터가 올바른 해를 도출시키도록 하는 것이다. 즉, 추론의 효율성이 전문가 시스템의 효율성을 좌우한다. 시스템이 어떠한 목적을 갖는가에 따라서, 지식표현 방법과 추론 방법 등이 결정된다. 최근 추론의 효율성을 극대화하기 위해 이용되고 있는 지식표현 및 추론 방법으로는 Rete, TREAT 등의 트리 표현을 사용하는 전향추론, 관계 리스트를 사용하는 직접추론 등이 있다. 본 논문에서는, 추론을 효율적으로 하기 위한 기본 방법 중, 지식표현을 보다 더 효과적으로 구축하는 방법을 택하였다. 기존의 지식 표현 방법을 살펴보고, 이를 기반으로 새로운 지식표현 방법인 ECBM(extended clause bit matrix)을 제안하고 이를 이용하여 전향추론, 후향추론이 가능한 추론엔진을 설계하였다.
Nam Su Oh,Kyeongmu Kim,Sangnam Oh,Younghoon Kim 한국축산식품학회 2019 한국축산식품학회지 Vol.39 No.5
In the current study, we first investigated a method for directly transforming lactose into galacto-oligosaccharides (GOS) for manufacturing low-lactose and GOSenriched skim milk (GSM) and then evaluated its prebiotic potential by inoculating five strains of Bifidobacterium spp. In addition, fermented GSM (FGSM) was prepared using a potentially probiotic Lactobacillus strain and its fermentation characteristics and antioxidant capacities were determined. We found that GOS in GSM were metabolized by all five Bifidobacterium strains after incubation and promoted their growth. The levels of antioxidant activities including radical scavenging activities and 3-hydroxy-3- methylglutaryl-CoA reductase inhibition rate in GSM were significantly increased by fermentation with the probiotic Lactobacillus strain. Moreover, thirty-nine featured peptides in FGSM was detected. In particular, six peptides derived from β-casein, two peptides originated from αs1-casein and κ-casein were newly identified, respectively. Our findings indicate that GSM can potentially be used as a prebiotic substrate and FGSM can potentially prevent oxidative stress during the production of synbiotic fermented milk in the food industry.
Determination of Microbial Diversity in Gouda Cheese via Pyrosequencing Analysis
Oh, Sangnam,Kim, Younghoon Korean Society of Dairy Science and Biotechnology 2018 한국유가공기술과학회지 Vol.36 No.2
The present study aimed to investigate the microbial diversity in Gouda cheese within the four months of ripening, via next-generation sequencing (NGS). Lactococcus (96.03%), and Leuconostoc (3.83%), used as starter cultures, constituted the majority of bacteria upon 454 pyrosequencing based on 16S rDNA sequences. However, no drastic differences were observed among other populations between the center and the surface portions of Gouda cheese during ripening. Although the proportion of subdominant species was <1%, slight differences in bacterial populations were observed in both the center and the surface portions. Taken together, our results suggest that environmental and processing variables of cheese manufacturing including pasteurization, starter, ripening conditions are important factors influencing the bacterial diversity in cheese and they can be used to alter nutrient profiles and metabolism and the flavor during ripening.
Oh Jayoung,Cho Younghoon,Kim Dong-Young 대한비과학회 2022 Journal of rhinology Vol.29 No.2
Background and Objectives: Measurement of sleep parameters in both supine and non-supine positions is important for the diagnosis of positional obstructive sleep apnea (OSA). However, the influence of right and left lateral decubitus positions (RLDP and LLDP, respectively) on sleep parameters is relatively unknown and has not been well investigated. This study was performed to verify the associations between sleep parameters and lateral decubitus sleep position.Methods: A retrospective study was performed on 38 patients who were diagnosed with OSA and underwent surgical interventions from January 2014 to December 2016. Preoperative sleep parameters were evaluated with WatchPAT, and patients who slept sufficiently in both RLDP and LLDP to accurately analyze sleep parameters were enrolled in the study. Basic clinical data including body mass index (BMI) and nasal endoscopic findings of patients were assessed.Results: The difference in peripheral arterial tonometry apnea-hypopnea index (pAHI) and PAT respiratory disturbance index (pRDI) between RLDP and LLDP showed no association with the side of deviated nasal septum. Patients with higher BMI showed higher pRDI in LLDP than RLDP (p=0.038). The difference in sleep position percentage between RLDP and LLDP was negatively correlated with the difference in pRDI (p=0.023).Conclusion: Higher BMI patients with OSA might benefit more from sleeping in RLDP than LLDP. Patients slept longer in the lateral decubitus position that produced lower pRDI. Not only supine and non-supine positions, but also RLDP and LLDP need to be evaluated in patients with OSA.