• 한국생물물리학회:학술대회논문집
• /
• 한국생물물리학회 2002년도 제9회 학술 발표회 프로그램과 논문초록
• /
• pp.28-28
• /
• 2002

Peptidoglycan is an extensively cross-linked polymer essential for the integrity of the bacterial cell wall. Many antibiotics act by disruption of its biosynthesis and assembly, several are targeted against the cytoplasmic enzymes that synthesize the key intermediate UDP-N-acetylmuramyl pentapeptide. One such drug is fosfomycin, which inactivates the first enzymes in this pathway, UDP-N-acetylglucosamine enopyruvyl transferase (murZ).(omitted)

• Journal of Microbiology
• /
• 제40권2호
• /
• pp.151-155
• /
• 2002

A Superoxide Dismutase (SOD) gene from the obligate intracellular bacterium Orientia tsutsugamushi has been cloned by using the polymerase chain reaction with degenerate oligonucleotide primers corresponding to conserved regions of known SODs. Nucleotide sequencing revealed that the predicted amino acid sequence was significantly more homologous to known iron-containing SODs (FeSOD) than to manganese-containing SODs (MnSOD). Conserved regions in bacterial FeSOD could also be seen. Isolation of the oriential SOD gene may provide an opportunity to examine its role in the intracellular survival of this bacterium.

• 한국해양바이오학회지
• /
• 제5권4호
• /
• pp.26-32
• /
• 2011

Green fluorescent protein (GFP), a very important biological agent that involves shifting the color of bioluminescence from blue to green in luminous coelenterates and to increase the quantum yield of light emission. GFP discovered in medusa, Aequorea victoria is a key factor of various biotechnological and cell biological applications. Beside these applications, GFP of A. victoria is generally stable, which does not require co-factors for activity and can be functionally expressed in different bacterial species. This property of GFPs from A. victoria permits them to be a unique tool to monitor gene expression and protein localization in different organisms. The present review brings out the past milestones and future perspectives on GFPs, with an elaborative reviewing on its applications.

• 한국동물학회지
• /
• 제20권1호
• /
• pp.19-28
• /
• 1977

In order to evaluate the mutagenic potential in animal for these pesticides which were proved to be mutagenic in the bacterial screening system with a metabolic activation in vitro, we have studied in vivo cytogenetic effects on mouse bone marrow by means of the micronucleus test. The clastogenic activity of the chemical is evaluated as the frequency of micronuclei in polychromatic erythrocytes. We have tested six pesticides, insecticides, DDVP and trichlorfon, fungicide, TMTD, herbicides, NIP and MO and growth regula색, maleic hydrazide. It was found that among the tested pesticides only TMTD exhibited minimal activity in inducing micronuclei. Organophosphorus insecticide DDVP that is the most broadly used and economically important chemical, did not increase the micronuclei frequencies in mouse bone marrow cells as with the all other pesticides tested.

• 한국미생물·생명공학회지
• /
• 제51권3호
• /
• pp.314-316
• /
• 2023

Colistin is one of the last-resort antibiotics used to treat multidrug-resistant Gram-negative bacterial infection in both human and animals. Here, we report the complete genome sequence of colistin-resistant Salmonella enterica serotype Enteritidis strain CRSE-01 isolated from poultry carcass in South Korea. The assembled genome consists of a 4,783,907-bp circular chromosome containing numerous antimicrobial resistance genes and a 59,372-bp plasmid.

• Journal of Microbiology and Biotechnology
• /
• 제34권7호
• /
• pp.1522-1529
• /
• 2024

CRISPR-Cas system is being used as a powerful genome editing tool with developments focused on enhancing its efficiency and accuracy. Recently, the miniature CRISPR-Cas12f1 system, which is small enough to be easily loaded onto various vectors for cellular delivery, has gained attention. In this study, we explored the influence of temperature conditions on multiplex genome editing using CRISPR-Cas12f1 in an Escherichia coli model. It was revealed that when two distinct targets in the genome are edited simultaneously, the editing efficiency can be enhanced by allowing cells to recover at a reduced temperature during the editing process. Additionally, employing 3'-end truncated sgRNAs facilitated the simultaneous single-nucleotide level editing of three targets. Our results underscore the potential of optimizing recovery temperature and sgRNA design protocols in developing more effective and precise strategies for multiplex genome editing across various organisms.

• Pediatric Infection and Vaccine
• /
• 제10권2호
• /
• pp.208-214
• /
• 2003

목 적 : 소아에서의 세균성 수막염은 아직도 높은 사망률과 합병증을 나타내는 질환으로, 최근에 내성균의 증가 및 Hib 백신의 보급으로 항생제 치료 효과와 호발 원인균의 변화가 예상되고 있다. 이에 저자들은 최근 7년간 인하대학교병원에 입원하여 세균성 수막염으로 진단 받은 환아를 조사하여 세균성 수막염 환아의 역학 및 동향을 이해하는데 도움이 되고자 한다. 방 법 : 1996년 6월부터 2003년 6월까지 인하대학교병원 소아과에 입원하여 세균성 수막염으로 진단된 43명을 대상으로 하였다. 이들은 뇌척수액 세균배양 검사에서 양성인 31명과 뇌척수액 latex 응집검사로 세균 항원을 진단한 7명, 그리고 뇌척수액 생화학적 소견 및 혈액배양검사에서 양성인 5명이었다. 결 과 : 1) 2개월 미만은 19례(44.2%), 2개월 이상 1세미만은 10례(23.3%), 1세 이상 15세 미만은 14례(32.5%)로 1세 미만이 67.5%로 대부분을 차지하였고, 남녀 성비는 2.6 : 1이었다. 2) 2개월 미만의 원인균주는 19례로 GBS 9례(47.4%), E. coli 4례(21.1%), Klebsiella pneumoniae 4례(21.1%)의 빈도였고, 2개월 이상은 24례로 S. peumoniae 12례(50%), H. influenzae 4례(16.7%), N. meningitidis 4례(16.7%)가 흔한 균주였다. 3) H. influenzae 뇌막염은 5례로 모두 Hib 접종을 안한 환아였고, 2001년도 이후에는 발생이 없었다. 4) 사망한 경우는 2례(4.5%)로 H. influenzae, Klebsiella pneumoniae였으며, 생존한 41례 중 16례(39%)에서 뇌실염 및 수두증, 경막하 삼출, 간질, 뇌경색 등의 합병증을 남겼다. 5) 합병증이 없었던 25례 중 48시간 이전에 치료를 한 경우가 18례(72%)였고, 합병증이 있었던 16례 중 14례(87.5%)에서 모두 48시간 이후에 치료를 한 경우였다. 6) S. pneumoniae 전례에서 penicillin에 내성을 보였으며, ceftriaxone에는 50%의 민감성을 보였다. GBS에서는 ceftriaxone에는 100%의 민감성을, penicillin에서는 44.4%의 민감성을 보였으나 전례에서 penicillin에 반응을 보였다. 결 론 : 세균성 수막염의 예후인자로 치료시기가 중요한 결정인자였고, Hib 백신이 보급되기 시작한 이후 H. influenzae에 의한 수막염의 발생이 감소하였다.

• 대한한방부인과학회지
• /
• 제27권1호
• /
• pp.81-100
• /
• 2014

Objectives: The object of this study was to observe the in vitro anti-bacterial and anti-inflammatory effects of six single aqueous herbal extracts-Quisqualis Fructus (QuF), Meliae Cortex (MeC), Arecae Semen (ArS), Crassirhizomae Rhizoma (CrR), Ulmi Pasta Semen(UlS), Torreyae Semen(ToS)- against Staphylococcus aureus (S. aureus) and Lipopolysaccharide(LPS)-activated Raw 264.7 cells. Methods: Anti-bacterial activities against S. aureus of aqueous extracts of QuF, MeC, ArS, CrR, UlS and ToS were detected using standard agar microdilution methods. In addition, the effects on the cell viability, prostaglandin $E_2$ ($PGE_2$), nitric oxide (NO), tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$), interleukin (IL)-$1{\beta}$ and IL-6 productions of LPS activated Raw 264.7 cells were detected. The anti-bacterial and anti-inflammatory effects were respectively compared with lincomycin and piroxicam. Results: Minimal Inhibition Concentration (MIC) of aqueous extracts of QuF, MeC, ArS, CrR, UlS and ToS against S. aureus was respectively detected $5.625{\pm}4.075$ (3.125~12.500), $0.332{\pm}0.273$ (0.098~0.782), $1.094{\pm}0.428$ (0.782~1.563), $2.969{\pm}2.096$ (0.782~6.250), $9.375{\pm}4.419$ (3.125~12.500)>25 mg/ml. MIC of lincomycin was detected as $0.469{\pm}0.297$ (0.195~0.782) ${\mu}g/ml$ at same conditions. In addition, $ED_{50}$ against LPS-induced cell viabilities and cytokine releases of QuF, MeC, ArS, CrR, UlS and ToS was as follows - Cell viability: 66.370, 2.908, 1.747, 259.553, 18.150 and 34.160 mg/ml; NO production: 389.486, 0.294, 0.138, 523.060, 45.363 and 49.327 mg/ml; $PGE_2$ production: 114.271, 0.223, 0.046, 243.078, 8.829 and 28.947 mg/ml; TNF-${\alpha}$ production: 406.288, 0.343, 0.123, 9404.227, 125.406 and 140.775 mg/ml; IL-$1{\beta}$ production: 117.178, 0.135, 0.019, 237.451, 7.923 and 19.418 mg/ml; IL-6 production: 31.261, 0.105, 0.055, 128.434, 2.290 and 3.745 mg/ml. ED50 of piroxicam against LPS-induced cell viabilities, NO, $PGE_2$, TNF-${\alpha}$, IL-$1{\beta}$ and IL-6 were detected as 35.179, 6.552, 1.162, 7.273, 7.101 and $5.044{\mu}g/ml$, respectively at same conditions. Conclusions: All six single aqueous herbal extracts showed anti-bacterial effects against S. aureus, in the order of MeC, ArS, CrR, QuF and UlS aqueous extracts except for ToS; they did not showed any anti-bacterial effects (MIC>25 mg/ml). They also showed anti-inflammatory effects against LPS-activated Raw 264.7 cells in the order of ArS, MeC, UlS, ToS, QuF and CrR aqueous extracts. It means that the ArS and MeC will be showed favorable potent anti-bacterial and related anti-inflammatory effects.

• Asian-Australasian Journal of Animal Sciences
• /
• 제29권1호
• /
• pp.149-156
• /
• 2016

In this experiment, we proposed and implemented a disease forecasting system using a received signal strength indication ZigBee-based wireless network with a 3-axis acceleration sensor to detect illness at an early stage by monitoring movement of experimentally infected weaned piglets. Twenty seven piglets were divided into control, Salmonella enteritidis (SE) infection, and Escherichia coli (EC) infection group, and their movements were monitored for five days using wireless sensor nodes on their backs. Data generated showed the 3-axis movement of piglets (X-axis: left and right direction, Y-axis: anteroposterior direction, and Z-axis: up and down direction) at five different time periods. Piglets in both infected groups had lower weight gain and feed intake, as well as higher feed conversion ratios than the control group (p<0.05). Infection with SE and EC resulted in reduced body temperature of the piglets at day 2, 4, and 5 (p<0.05). The early morning X-axis movement did not differ between groups; however, the Y-axis movement was higher in the EC group (day 1 and 2), and the Z-axis movement was higher in the EC (day 1) and SE group (day 4) during different experimental periods (p<0.05). The morning X and Y-axis movement did not differ between treatment groups. However, the Z-axis movement was higher in both infected groups at day 1 and lower at day 4 compared to the control (p<0.05). The midday X-axis movement was significantly lower in both infected groups (day 4 and 5) compared to the control (p<0.05), whereas the Y-axis movement did not differ. The Z-axis movement was highest in the SE group at day 1 and 2 and lower at day 4 and 5 (p<0.05). Evening X-axis movement was highest in the control group throughout the experimental period. During day 1 and 2, the Z-axis movement was higher in both of the infected groups; whereas it was lower in the SE group during day 3 and 4 (p<0.05). During day 1 and 2, the night X-axis movement was lower and the Z-axis movement was higher in the infected piglets (p<0.05). Overall, the movement of infected piglets was altered, and the acceleration sensor could be successfully employed for monitoring pig activity.

• Journal of Microbiology and Biotechnology
• /
• 제17권8호
• /
• pp.1361-1368
• /
• 2007

Endophytic bacteria associated with the roots of coastal sand dune plants were isolated, taxonomically characterized, and tested for their plant growth-promoting activities. Ninety-one endophytic bacterial isolates were collected and assigned to 17 different genera of 6 major bacterial phyla based on partial 16S rDNA sequence analyses. Gammaproteobacteria represented the majority of the isolates (65.9%), and members of Pseudomonas constituted 49.5% of the total isolates. When testing for antagonism towards plant pathogenic fungi, 25 strains were antagonistic towards Rhizoctonia solani, 57 strains were antagonistic towards Pythium ultimum, 53 strains were antagonistic towards Fusarium oxysporum, and 41 strains were antagonistic towards Botrytis cinerea. Seven strains were shown to produce indole acetic acid (IAA), 33 to produce siderophores, 23 to produce protease, 37 to produce pectinase, and 38 to produce chitinase. The broadest spectra of activities were observed among the Pseudomonas strains, indicating outstanding plant growth-promoting potential. The isolates from C. kobomugi and M. sibirica also exhibited good plant growth-promoting potential. The correlations among individual plant growth-promoting activities were examined using phi coefficients, and the resulting data indicated that the production of protease, pectinase, chitinase, and siderophores was highly related.