• Title/Summary/Keyword: antibacterial spectrum

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Dyeing of Silk Fabrics Using Zizania latifolia Turcz. Extract (줄풀을 활용한 견직물의 염색)

  • Lee, Hyesun;Ko, Eunsook
    • Textile Coloration and Finishing
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    • v.30 no.2
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    • pp.150-157
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    • 2018
  • The purpose of this study is to investigate the proper dyeing condition, color fastness and functionality of silk fabrics dyed with Zizania latifolia Turcz. FT-IR spectrum analysis suggests that colorants of Zizania latifolia Turcz. are tannins. The dyeing of the silk fabrics using Zizania latifolia Turcz. was very good even without pretreatment or mordanting treatment. Optimal dyeing conditions of silk fabrics were colorant concentration of 200%(o.w.f.), dyeing temperature of $100^{\circ}C$, dyeing time of 60 minutes and dyebath pH of 5.5. Color fastness of dyed silk fabrics to washing, rubbing, perspiration and light was 4~4-5, 5, 4~4-5(acidic), 4-5(alkaline) and 2 respectively. UV protection rate and deodorization rate of silk fabrics dyed with Zizania latifolia Turcz. were improved. Reduction rate(Staphyloccus aureus) of silk fabrics was excellent at 98.3%. As a result, it was confirmed that the Zizania latifolia Turcz. could be used as an eco-friendly functional natural dye.

NMR Signal Assignment of a New Quinolone Antibiotic Substance

  • Donghyuk Shin;Kim, Daesung;Yongho Jung;Hoshik Won
    • Journal of the Korean Magnetic Resonance Society
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    • v.6 no.1
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    • pp.78-83
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    • 2002
  • A new fluoroquinolone (DW-116) with a broad antibacterial spectrum was synthesized by introducing functional fluoropyridyl and methylpyrazine groups on N1, C7 position of quinolone moiety, respectively. $^{1}$H and $^{13}$ C NMR signal assignments and structure were completely elucidated by 2D-NMR methods. Physicochemical properties of products were also investigated. DW-116 is decomposed at 306.9$^{\circ}C$ and the decomposition starts at around 285$^{\circ}C$. The free base form is melt at 280.7$^{\circ}C$ and started to be decomposed immediately. DW-116 has two kinds of polymorphism which is important in drug action but these two plate and rod types have the same solubility in water. However the solubility is quite different in less or polar solvent. The plate type is more soluble in less polar solvent except in dichloromethane.

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Identification and Partial Characterization of Cerein BS229, a Bacteriocin Produced by Bacillus cereus BS229

  • Paik, Hyun-Dong;Lee, Na-Kyoung;Lee, Kwang-Ho;Hwang, Yong-Il;Pan, Jae-Gu
    • Journal of Microbiology and Biotechnology
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    • v.10 no.2
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    • pp.195-200
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    • 2000
  • Bacillus cereus BS229 was identified as a bacteriocin producer with a bactericidal activity against Bacillus thuringiensis subsp. Thomsoni BR-40. Bacillus cereus BS229 and cerein BS229, named tentatively as the bacteriocin produced by Bacillus cereus BS229, showed a narrow spectrum of actibity against Gram-positive and Gram-negative bacteria, along with yeast and molds. Production of cerein BS229 in a 5-1 fermenter followed typical kinetics of primary metabolite synthesis. The antibacterial activity of cerein BS229 on sensitive indicator cells disappeared completely by ${\alpha}-chmotrypsin$ or proteinase K, which indicates its proteinaceous nature. Cerein BS229 seemed to be very stable throughout the pH range of 2.0 of 9.0 and it was relatively heat labile, despite the fact that bacteriocin activity was still detected after being boied for 30min. Cerein BS229 actibity has been changed with some of the organic solvents such as toluene, ethanol, and chloroform. Direct detection of cerein BS229 actibity on SDS-PAGE suggested that it had an apparent molecular mass of about 8.2 kDa.

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Axenic purification and cultivation of an Arctic cyanobacterium, Nodularia spumigena KNUA005, with cold tolerance potential for sustainable production of algae-based biofuel

  • Hong, Ji-Won;Choi, Han-Gu;Kang, Sung-Ho;Yoon, Ho-Sung
    • ALGAE
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    • v.25 no.2
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    • pp.99-104
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    • 2010
  • A psychrotolerant cyanobacterium, Nodularia spumigena KNUA005, was isolated from a cyanobacterial bloom sample collected near Dasan Station in Ny-${\AA}lesund$, Svalbard Islands during the Arctic summer season. To generate an axenic culture, the isolate was subjected to three purification steps: centrifugation, antibiotic treatment and streaking. The broad antibacterial spectrum of imipenem killed a wide range of heterotrophic bacteria, while the cyanobacterium was capable of enduring both antibiotics, the remaining contaminants that survived after treatment with imipenem were eliminated by the application of an aminoglycoside antibiotic, kanamycin. Physical separation by centrifugation and streaking techniques also aided axenic culture production. According to the cold-tolerance test, this mat-forming cyanobacterium was able to proliferate at low temperatures ranging between 15 and $20^{\circ}C$ which indicates the presence of cold-tolerance related genes in N. spumigena KNUA005. This suggests the possibility of incorporating cold-resistance genes into indigenous cyanobacterial strains for the consistent production of algae-based biofuel during the low-temperature seasons. Therefore, it is needed to determine the cold-tolerance mechanisms in the Arctic cyanobacterium in the next research stage.

The Optimum Culture Conditions for the Production of Antibiotics KG-1167A & KG-1167B Produced by Clostridium sp. (Clostridium sp.가 생산하는 항생물질 KG-1167Adhk KG-1167B의 최적 생산조건)

  • 홍수형;남재성;하지홍;박용복
    • Microbiology and Biotechnology Letters
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    • v.18 no.3
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    • pp.292-295
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    • 1990
  • The bacterial strain KH-1167, identified as Ctoetridiunt sp. was found to produce the antibiotics KG-1167A & KG-1167B which showed a broad spectrum antibacterial activity. The highest antibiotics production was obtained in fermentation medium containing glucose, casamino acid and salt complex solution. Optimum culture condition for the maximum production of the antibiotics was also determined. Antibiotic productivity of the Clostridium sp. KH-1167 was increased to about 450% compared to that in the medium used for the primary isolation procedure.

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Purification and Biological Activities of MT 1155 Inducing Morphological Change of Rous Sarcoma Virus-Transformed Normal Rat Kidney Cell (Rous Sarcoma Virus에 의해 형질전환된 NRK 세포의 형태변화를 유도하는 활성물질 MT 1154의 분리와 생물학적 활성)

  • 안종석;박문수;박찬선;윤병대;민태익;안순철;오원근;이현선;윤병대
    • Microbiology and Biotechnology Letters
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    • v.21 no.1
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    • pp.59-65
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    • 1993
  • We isolated Actinomycetes strain GMT 1155 and purified the active compound, MT 1155, on the morphological reversion of ts/NRK cell from the isolate. MT 1155 was identified as toyocamycin having antifungal and antitumor activities from physico-chemical properties and UV, IR, $^1H$-NMR, $^13C$-NMR and mass spectrum. MT 1155 showed the morphologically reversional activity on ts/NRK cell and the cytotoxicity on CTLL cell at the final concentrations of 1.7 JlM and 0.2 11M, respectively and its $IC_{50}$ value on protein kinase A enzyme was 2.3 $\mu$M. Also it had strong antifungal activity against several pathogenic fungi but not antibacterial activity. And it did not inhibit both protein kinase C activity and the bleb-formation of K562 cell induced by phorbol esters.

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Stability and Antibacterial Activity of Bacteriocins Produced by Bacillus thuringiensis and Bacillus thuringiensis ssp. kurstaki

  • Jung, Woo-Jin;Mabood, Fazli;Souleimanov, Alfred;Zhou, Xiaomin;Jaoua, Samir;Kamoun, Fakher;Smith, Donald L.
    • Journal of Microbiology and Biotechnology
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    • v.18 no.11
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    • pp.1836-1840
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    • 2008
  • Bacteriocins are antimicrobial peptides that are produced by bacteria and toxic to bacterial strains closely related to the producer strain. It has previously been reported that Bacillus thuringiensis strain NEB17 and Bacillus thuringiensis subsp. kurstaki BUPM4 produce the bacteriocins thuricin 17 (3,162 Da) and bacthuricin F4 (3,160.05 Da), respectively. Here, we demonstrate that these bacteriocins have functional similarities and show a similar spectrum of antimicrobial activities against indicator strains. We also studied the effects of sterilization methods on the recovery and biological activities of these bacteriocins. They were completely degraded by autoclaving and the two were similarly affected by the tested filter membranes. Polyvinylidene fluoride (PVDF), polyestersulfone (PES), and cellulose acetate (CA) are suitable for filter sterilization of these bacteriocins. The two bacteriocins were stable across a range of storage conditions. These data will facilitate their utilization in food preservation or agricultural applications.

Factors Affecting in Vitro Activity of LB20304, a New Flu-oroquinolone

  • Paek, Kyoung-Sook;Ahn, Mi-Jeong;Kim, Mu-Yong;Kim, In-Chull;Kwak, Jin-Hwan
    • Archives of Pharmacal Research
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    • v.19 no.2
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    • pp.143-147
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    • 1996
  • LB20304 is a novel fluoroquinolone that exhibits a potent broad spectrum antibacterial activity against both gram-positve and gram-negative bacteria. The MICs (Minimal Inhibitory Concentration) of LB20304 were determined against both gram-positve and gram-negative bacteria under various conditions including several media, pHs, and inoculum concentrations. The in vitro activity of LB20304 was not significantly affected by the changes in testing conditions such as components of media and inoculum concentrations, but it was slightly reduced by acid condition. The MICs and MBCs (Minimal Bactericidal Concentration) of LB20304 against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were hardly affected by the presence of 50 % human serum, mouse serum, guinea pig serum or horse serum, and the MBCs were equal to or at most four-times higher than the MiCs. The activities of LB20304 were decreased by the presence of high concentraion of $Mg^{++}$ or human urine (pH, 5.5) in the test media. The frequencies of mutants resistant to LB20304 were similar to or lower than those found in ciprofloxacin and sparfloxacin.

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Purification and Characterization of a Bacteriocin, BacBS2, Produced by Bacillus velezensis BS2 Isolated from Meongge Jeotgal

  • Perumal, Venkatesh;Yao, Zhuang;Kim, Jeong A;Kim, Hyun-Jin;Kim, Jeong Hwan
    • Journal of Microbiology and Biotechnology
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    • v.29 no.7
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    • pp.1033-1042
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    • 2019
  • Bacillus velezensis BS2 was isolated from meongge (common sea squirt) jeotgal, a Korean fermented seafood, and produces a bacteriocin, BacBS2, which strongly inhibits Listeria monocytogenes and Bacillus cereus. BacBS2 was partially purified by Q-Sepharose column chromatography after ammonium sulfate precipitation of the culture supernatant, then further purified by Sephadex G-50 column chromatography. Partially purified BacBS2 was estimated to be 6.5 kDa in size by Tricine-SDS PAGE and activity detection by gel-overlay. Enzyme treatment and FT-IR spectrum of partially purified BacBS2 confirmed its proteinaceous nature. BacBS2 was fully stable at pH 4-9, and half of activity was retained at pH 1-3. Full activity was retained after exposure to $80^{\circ}C$ for 15 min, but half of the activity was retained upon exposure to $90^{\circ}C$ for 15 min or $100^{\circ}C$for 10 min. BacBS2 inhibited L. monocytogenes by bactericidal mode of action. B. velezensis BS2 and its BacBS2 seem useful as biopreservatives for fermented foods such as jeotgal.

Dyeability and Functionality of Wool Fabrics Dyed with Chamaecyparis obtusa Leaf Extract (편백나무 잎 추출물로 염색한 모직물의 염색성 및 기능성)

  • Ko, Eunsook;Lee, Hyesun;Han, Chunghun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.43 no.2
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    • pp.288-296
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    • 2019
  • This study examined the proper dyeing conditions, color fastness and functionality for wool fabrics dyed with Chamaecyparis obtusa leaf extract. FT-IR and UV-Vis spectrum analysis showed that tannin and flavonoids were contained in the extracted colorant. The dyeing of wool fabrics using Chamaecyparis obtusa leaf was good without pretreatment or mordant treatment. Optimal dyeing conditions for wool fabrics were a colorant concentration of 70%(v/v), dyeing temperature of $100^{\circ}C$, dyeing time of 100 minutes and dyebath pH of 5.8. Color fastness of dyed wool fabrics to washing, rubbing, perspiration was good, whereas light was grade 3. The UV protection rate and deodorization rate of wool fabrics dyed with Chamaecyparis obtusa leaf improved. Reduction rate of Staphylococcus aureus/Klebsiella pneumoniae were excellent at 99.9%. Therefore, it was confirmed that Chamaecyparis obtusa leaf can be used as environ-mentally friendly natural dye.