• 한국동물학회:학술대회논문집
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• 한국동물학회 1996년도 한국생물과학협회 국제학술대회
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• pp.238.1-238
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• 1996

No Abstract, See Full Text

• 대한약학회:학술대회논문집
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• 대한약학회 2001년도 Proceedings of International Convention of the Pharmaceutical Society of Korea
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• pp.222.1-222.1
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• 2001

• Journal of Microbiology and Biotechnology
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• 제27권8호
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• pp.1529-1538
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• 2017

Klebsiella pneumoniae is an opportunistic and clinically significant emerging pathogen. We investigated the relative roles of Toll-like receptor (TLR) 2 and TLR4 in initiating host defenses against K. pneumoniae. TLR2 knockout (KO), TLR4 KO, TLR2/4 double KO (DKO), and wild-type (WT) mice were inoculated with K. pneumoniae. Mice in each group were sacrificed after either 12 or 24h, and the lungs, liver, and blood were harvested to enumerate bacterial colony-forming units (CFU). Cytokine and chemokine levels were analyzed using enzyme-linked immunosorbent assay and real-time PCR, and pneumonia severity was determined by histopathological analysis. Survival was significantly shortened in TLR4 KO and TLR2/4 DKO mice compared with that of WT mice after infection with $5{\times}10^3CFU$. TLR2 KO mice were more susceptible to infection than WT mice after exposure to a higher infectious dose. Bacterial burdens in the lungs and liver were significantly higher in TLR2/4 DKO mice than in WT mice. Serum $TNF-{\alpha}$, MCP-1, MIP-2, and nitric oxide levels were significantly decreased in TLR2/4 DKO mice relative to those in WT mice, and TLR2/4 DKO mice showed significantly decreased levels of $TNF-{\alpha}$, IL-6, MCP-1, and inducible nitric oxide synthase mRNA in the lung compared with those in WT mice. Collectively, these data indicate that TLR2/4 DKO mice were more susceptible to K. pneumoniae infection than single TLR2 KO and TLR4 KO mice. These results suggest that TLR2 and TLR4 play cooperative roles in lung innate immune responses and bacterial dissemination, resulting in systemic inflammation during K. pneumoniae infection.

• 미생물학회지
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• 제34권1_2호
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• pp.31-36
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• 1998

지네 Scolopendra subspinipes multilans L. Koch로부터 정제한 Centipedin의 gram-negative, gram-positive bacteria 및 fungi에 대한 광범위 항균 spectrum을 조사하였으며 액체배지를 사용하여 각 균주에 대한 minimal inhibitory concentrations(MICs)값을 측정하였다. 인체의 기관중 주로 폐에 감염되는 gram-negative bacteria인 Klebsiella pneumoniae ATCC 8308 균주에 대한 MIC값이 $2{\mu}g/ml$로서 가장 강한 항균력을 나타내었고 화농균인 Proteus vulgaris NRRL B-123 균주에 대해서도 MIC값이 $16{\mu}g/ml$로 비교적 높은 항균력을 나타내었으며 항균제로서의 작용 mechanism을 시험한 결과 prokaryotic RNA transcription을 억제함을 알 수 있었다. Human blood leukemia(HL-60)와 mouse B lymphocyte myeloma cell 등의 동물세포에 대한 Centipedin의 cytotoxicity는 없는 것으로 확인되었다.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2011년도 제44차 학술발표회
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• pp.59-59
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• 2011

현재 우리들 사회의 환경과 생활이 윤택해 짐에 따라 문화생활을 영위하게 되고, 건강에 대한 의식이 커져가고 있다. 이에 건강을 유지하고 증진시킬 수 있는 환경 친화적인 제품에 대한 관심 또한 높아지고 있다. 특히 기존의 합성염료보다 천연염료로 염색한 제품은 고부가가치를 창출하며 환경친화적이고 인체친화적이다. 이를 바탕으로 Cleaner제품에 천연염색을 하고 천연항균제를 처리하여 제품의 세탁 후 항균지속성에 관하여 검토하였다. 본 연구에서는 대나무섬유와 N/P극세사 혼방소재에 꼭두서니와 치자로 염색한 뒤, 욕비 1:30으로 고정하고, 5%천연항균제 용액을 제조하였다. 제조된 용액에 시료를 5분간 침지 후, Pick-up율 70%로 조정하였다. 그리고 $80^{\circ}C$에서 20분간 건조 후, $110^{\circ}C$에서 1분간 열처리 하였다. KS K IOS 105-C06의 방법으로 30회 세탁하였다. KS K 0693과 AATCC 100의 시험방법으로 Staphylococcus aureus ATCC 6538(황색포도상구균)과 Klebsiella pneumoniae ATTC 4352(폐렴구균)의 균주에 대한 항균성을 측정하였다. KS K 0693의 경우 Staphylococcus aureus ATCC 6538(황색포도상구균)와 Klebsiella pneumoniae ATTC 4352(폐렴구균)에서 모두 99.9%의 정균감소률을 나타내었고, 또한 AATCC 100에서도 Staphylococcus aureus ATCC 6538(황색포도상구균)과 Klebsiella pneumoniae ATTC 4352(폐렴구균)에서도 모두 99.9%의 정균감소률을 나타냈다.

• Journal of Microbiology and Biotechnology
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• 제24권6호
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• pp.781-787
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• 2014

2-Ketogluconic acid production by Klebsiella pneumoniae is a pH-dependent process, strictly proceeding under acidic conditions. Unfortunately, cell growth is inhibited by acidic conditions, resulting in low productivity of 2-ketogluconic acid. To overcome this deficiency, a two-stage fermentation strategy was exploited in the current study. During the first stage, the culture was maintained at neutral pH, favoring cell growth. During the second stage, the culture pH was switched to acidic conditions favoring 2-ketogluconic acid accumulation. Culture parameters, including switching time, dissolved oxygen levels, pH, and temperature were optimized for the fed-batch fermentation. Characteristics of glucose dehydrogenase and gluconate dehydrogenase were revealed in vitro, and the optimal pHs of the two enzymes coincided with the optimum culture pH. Under optimum conditions, a total of 186 g/l 2-ketogluconic acid was produced at 26 h, and the conversion ratio was 0.98 mol/mol. This fermentation strategy has successfully overcome the mismatch between optimum parameters required for cell growth and 2-ketogluconic acid accumulation, and this result has the highest productivity and conversion ratio of 2-ketogluconic and produced by microorganism.

• Journal of Microbiology and Biotechnology
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• 제16권6호
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• pp.870-879
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• 2006

The present study describes the formation of succinic acid by a nonvirulent, highly osmotolerant Klebsiella pneumoniae strain SAP (succinic acid producer), its profile of metabolites, and enzymes of the succinate production pathway. The strain produced succinate along with other metabolites such as lactate, acetate, and ethanol under aerobic as well as anaerobic growth conditions. The yield of succinate was higher in the presence of $MgCO_3$ under $N_2$ atmosphere as compared with that under $CO_2$ atmosphere. Analysis of intracellular metabolites showed the presence of a smaller PEP pool than that of pyruvate. Oxaloacetate, citrate, and $\alpha$-ketoglutarate pools were considerably larger than those of isocitrate and fumarate. In order to understand the synthesis of succinate, the enzymes involved in end-product formation were studied. Levels of phosphoenolpyruvate carboxykinase, fumarate reductase, pyruvate kinase, and acetate kinase were higher under anaerobic growth conditions. Based on the profiles of the metabolites and enzymes, it was concluded that the synthesis of succinate took place via oxaloacetate, malate, and fumarate in the strain under anaerobic growth conditions. The strain SAP showed potential for the bioconversion of fumarate to succinate under $N_2$ atmosphere in the presence of $MgCO_3$. At an initial fumarate concentration of 10 g/l, 7.1 g/l fumarate was converted to 7 g/l succinate with a molar conversion efficiency of 97.3%. The conversion efficiency and succinate yield were increased in the presence of glucose. Cells grown on fumarate contained an 18-fold higher fumarate reductase activity as compared with the activity obtained when grown on glucose.

• 동의생리병리학회지
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• 제19권3호
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• pp.753-759
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• 2005

In order to evaluate the in vivo synergic effect of Eunkyo-san with quinolone antibiotics, rufloxacin (RUFX), the viable bacterial numbers and histopathological changes were monitored after experimental respiratory infection with Klebsiella peumoniae NCTC 9632. The obtained results were as follows : In RUFX group, the viable bacterial numbers were significantly decreased compared to those of control group and these were more dramatically decreased compared to those of single treatment with RUFX, respectively in concomitant treated groups with Eunkyo-san. In control group, severe infiltration of inflammatory cells, hemorrhage and hypertrophy of alveolar linings were demonstrated at microscopical levels. However, these abnormal histopathological changes were significantly decreased compared to those of control group in RUFX group, and these were more dramatically decreased compared to those of single treatment with RUFX, respectively in concomitant treated groups with Eunkyo-san. In RUFX group, the LSA% (luminal surface of alveolar%) were significantly increased compared to those of control group and these were more dramatically decreased compared to those of single treatment with RUFX, respectively in concomitant treated groups with Eunkyo-san. According to these results, it is considered that in vivo antibacterial activity of RUFX group was dramatically increased by concomitant use of Eunkyo-san against K. pneumoniae NCTC 9632 infection of respiratory tract.

• 폴리머
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• 제35권3호
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• pp.210-215
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• 2011

루틴은 항발암, 소염제, 항바이러스성 기능을 갖는 물질이다. 미생물이 만들어낸 폴리에스테르인 PHBV와 루틴을 전기방사하여 나노섬유 부직포를 얻었다. 나노섬유 부직포의 항균성은 황색포도상구균(Staphylococcus aureus), 폐렴간균(Klebsiella pneumoniae)을 사용하여 평가하였고, KB 셀을 이용하여 세포독성을 평가하였다. 그 결과 루틴을 3 wt% 함유할 때 지지체는 우수한 항균성을 보였으며, KB 셀을 이용한 실험결과로부터 루틴을 함유하는 PHBV 지지체는 세포독성을 나타내지 않음을 알 수 있었다.

• Archives of Pharmacal Research
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• 제24권6호
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• pp.590-596
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• 2001

A new extended-spectrum ${\beta}-lactamase$ with an isoelectric point (pl) of 6.2 was detected in Klebsiella pneumoniae Fl 61 that was isolated from a patient with infection. This strain was highly resistant to the third or fourth generation cephalosporins such as cceftazidime ceftriaxone, cefoperzaone, and cefpirome. Analysis of this strain by the double disk diffusion test showed synergies between amoxicillin-clavulanate (AMX-CA) and cefotaxime, and AMX-CA and aztreonam, which suggested that this strain produced a extended-spectrum ${\beta}-lactamase$ (ESBL). Cenetic analysis revealed that the resistance was due to the presence of a 9.4-kb plasmic, designated as pkpl 61, encoding for new ${\beta}-lactamase$ gene (bla). Sequence analysis showed that a new bla gene of pkpl 61 differed from $bla_{TEM-1}$ by three mutations leading to the following amino acid substitutions: $Val_{84}{\rightarrow}lie,{\;}Ala_{184}{\rightarrow}Val,{\;}and{\;}Gly_{238}{\rightarrow}Ser$. These mutations have not been reported previously in the TIM type ${\beta}-lactamases$ produced by clinical strains. The novel ${\beta}-lactamase$ was overexpressed in E. coli and purified by ion exchange chromatography on Q-Sepharose and CM-Sepharose, and then further purified by gel filtration on Sehadex G-200. The catalytic activity of th8 purified ${\beta}-lactamase$ was confirmed by the nitrocefin disk.