• Journal of Microbiology and Biotechnology
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• 제30권12호
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• pp.1793-1800
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• 2020

Bifidobacterium strains can provide several health benefits, such as antimicrobial and immunomodulatory effects. Some strains inhibit growth or cell adhesion of pathogenic bacteria, including multidrug-resistant bacteria, and their antibacterial activity can be intensified when combined with certain antibiotics. In addition, some strains of bifidobacteria reduce viral infectivity, leading to less epithelial damage of intestinal tissue, lowering the virus shedding titer, and controlling the release of antiviral substances. Furthermore, bifidobacteria can modulate the immune system by increasing immunoglobulins, and inducing or reducing pro- or anti-inflammatory cytokines, respectively. In particular, these anti-inflammatory effects are helpful in the treatment of patients who are already suffering from infection or inflammatory diseases. This review summarizes the antimicrobial effects and mechanisms, and immunomodulatory effects of Bifidobacterium strains, suggesting the potential of bifidobacteria as an alternative or complementary treatment option.

• 한국미생물·생명공학회지
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• 제38권1호
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• pp.77-83
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• 2010

산사자는 전 세계적으로 이용되는 있는 식용/약용 생물자원 중 하나이다. 본 연구에서는 산사자의 유용 생리활성 검토를 위한 연구의 일환으로, 산사자의 methanol 추출물 및 이의 n-hexane, ethylacetate, butanol 분획물 및 물 잔류물을 조제하여 항생제 다제내성 Pseudomonas aeruginosa 및 Candida sp.를 포함하는 다양한 병원성 및 식중독 미생물에 대한 항균활성을 평가하였다. 산사자의 methan이 추출물은 그람 양성 및 음성의 다양한 세균에 대해 항균활성을 나타내였고, 이의 분획물 중 ethylacetate 및 butanol 분획물은 Listeria monocytogen, Staphylococcus epidermidis, Staphylococcus aureus, Bacillus subtilis, Salmonella typhimurium, Proteus vulgaris, Escherichia coli는 물론 10종의 항생제 내성 병원성 Pseudomonas aeruginosa에 대해서도 우수한 항세균 활성을 나타내었다(최소생육억제농도 1.0~7.5 mg/mL). 또한 ethylacetate 및 butan이 분획물은 일부의 Candida sp.에 대해서도 항균활성을 나타내였다. 한편 n-hexane 분획물을 제외한 산사자 methan이 추출물 및 분획물들은 $500\;{\mu}g/mL$ 농도까지 인간적혈구에 대한 용혈현상을 보이지 않았으며, n-hexane 분획물은 $500\;{\mu}g/mL$ 농도에서 약 9.9%의 미미한 용혈활성을 나타내었다. 이러한 결과는 산사자가 다양한 세균의 제어는 물론 항생제 내성 Pseudomonas aeruginosa 제어를 위한 생물자원으로 개발 기능함을 제시하고 있다.

• Journal of Microbiology
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• 제45권1호
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• pp.53-57
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• 2007

A number of essential oils from Mongolian aromatic plants are claimed to have antimicrobial activities. The essential oil of Dracocephalum foetidum, a popular essential oil used in Mongolian traditional medicine, was examined for its antimicrobial activity. Eight human pathogenic microorganisms including B. subtilis, S. aureus, M. lutens, E. hirae, S. mutans, E. coli, C. albicans, and S. cerevisiae were examined. The essential oil of Dracocephalum foetidum exhibited strong antimicrobial activity against most of the pathogenic bacteria and yeast strains that were tested; by both the agar diffusion method and the minimum inhibitory concentration (MIC) assay ($MIC\;range\;was\;26-2592{\mu}g/ml$). Interestingly, Dracocephalum foetidum even showed antimicrobial activity against methicilin-resistant Staphylococcus aureus (MRSA) strains. We also analyzed the chemical composition of the oil by GC-MS and identified several major components, including n-Mentha-1,8-dien-10-al, limonene, geranial, and neral.

• 한국미생물·생명공학회지
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• 제48권4호
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• pp.429-438
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• 2020

The emergence of multi-drug resistant, pathogenic methicillin-resistant Staphylococcus aureus (MRSA) is a threat to global health and has created a need for novel functional therapeutic agents. In this study, we evaluated the underlying mechanisms of the anti-MRSA effect of an azaphilone pigment, sclerotiorin (SCL) from Penicillium sclerotiorum. The antimicrobial activity of SCL was evaluated using agar disc diffusion, broth microdilution, time-kill assays and biophysical studies. SCL exhibits selective activity against Gram positive bacteria including MRSA (range, MIC = 128-1028 ㎍/ml) and exhibited rapid bactericidal action against MRSA with a > 4 log reduction in colony forming units within three hours of administration. Biophysical studies, using fluorescent probes and laser or electron microscopy, demonstrated a SCL dose-dependent alternation in membrane potential (62.6 ± 5.0.4% inhibition) and integrity (> 95 ± 2.3%), and the release of UV260 absorbing materials within 60 min (up to 3.2 fold increase, p < 0.01) of exposure. Further, SCL localized to the cytoplasm and hydrolyzed plasmid DNA. While in vitro checkerboard studies revealed that SCL potentiated the antimicrobial activity of topical antimicrobials such as polymixin, neomycin, and bacitracin (Fractional Inhibitory Concentration Index range, 0.26-0.37). Taken together these results suggest that SCL targets the membrane and DNA of MRSA to facilitate its anti-MRSA antimicrobial effect.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1981년도 제15차 학술대회연제순서 및 초록
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• pp.39.2-39
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• 1981

지난 약 반세기에 걸쳐서 Penicillin을 비롯하여 많은 항생제 및 화학요법제의 등장으로 급성 혹은 만성중이염의 치료에 많은 도움을 주었다. 그런데, 근래에 이같은 약제의 무절제한 사용 및 오용으로 인한 내성균의 출현과 균교대현상 등으로 치료에 곤란을 겪고 있는 실정이다. 연자 등은 만성적인 이루를 주소로 하여 내원한 만성중이염 환자 50례를 대상으로 무균상태하에서 이루를 채취하여 균을 배양 및 동정하였으며 pipemidicacid를 비롯한 여러 항생제에 대한 감수성검사를 시행하였다. 그결과 중이염환자 50례에서 staphylococcus aureus 및 epidermidis, pseudomonas aeruginosa 및 putrefasciens, proteus mirabilis, $\alpha$-hemolytic streptococcus, klebsiella pneumonia, unproved gramnegative rod, serratia marcescens, corynebacterium이 검출되었으며, pipemidic acid를 투여하여 pseudomonas와 proteus에 의한 중이염에 좋은 치료효과를 보였으며 staphylococcus를 비롯한 다른 감염균에도 괄목할만한 치료효과를 나타냈다. Pipemidic acid는 piromidic acid의 새로운 유도체로서 gram양성균 뿐만 아니라 pseudomonas를 포함한 gram음성체에도 저명한 항균효과가 있음을 알 수 있었다.

• 대한환경공학회지
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• 제31권3호
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• pp.232-239
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• 2009

본 연구는 도시 하수처리장의 미생물 군집 내 항생제 내성 세균의 특징과 하천으로의 항생제 내성 세균 노출의 계절적 변화의 특성을 평가하였다. 일반 종속영양세균 배양을 위한 R2A agar (R2A)와 대장균군을 선택하여 배양하는 MacConkey sorbitol agar (MSA)에 항생제를 첨가 하여 제작한 배지에 하수처리장 시료를 도말하여 배양한 결과 모든 시료에서 다제 항생제 내성 세균을 검출 해 낼 수 있었다. Ampicillin과 sulfathiazole의 내성률이 다른 나라에 비해 높게 측정 되었으며 시료내 유기물의 정도, 사용된 배지에 따라 내성률이 다름을 볼 수 있었다. R2A 배지에서 분리된 다제 항생제 내성 세균은 모두 기존에 알려진 병원성 세균과 그 염기서열이 유사한 것으로 볼 때 병원성 세균의 항생제 내성 정도가 일반 세균보다 높음을 본 연구 결과로 보일 수 있었다. 또한 본 연구에서는 하수처리장이 하천에 미치는 유해성을 계절별로 관찰하여 전체 미생물중 항생제 내성 세균의 비율은 수온과 비례한다는 결과를 얻었다. 이 결과는 지구 온난화가 미생물 유해성을 증가시킬 가능성을 시사한다.

• 한국축산식품학회지
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• 제31권3호
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• pp.405-412
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• 2011

The purpose of this study was to isolate and characterize bacteriocin-producing bacteria against Clostridium perfringens from domestic animals to determine their usefulness as probiotics. The feces of cattle and chicken were used as sources to isolate bacteriocin-producing bacteria using the spot-on-lawn method. In total, 900 bacterial stains were isolated from domestic animal feces, and 19 strains were finally selected after determining the inhibitory activity against the pathogenic indicator C. perfringens KCTC 3269. Eighteen strains of Bacillus subtilis and one strain of Brevibacillus parabrevis were identified by 16s rRNA sequencing. Most of the bacterial strains isolated were resistant to 0.5% bile salts and remained viable after 2 h at pH 3.0. Additionally, some B. subtilis strains showed strong inhibitory activity against Listeria monocytogenes. We isolated and screened B. subtilis strains CB 153 and CB 189 from cattle and B. subtilis MSC 156 and B. parabrevis MSC 164 from chickens using probiotic selection criteria such as inhibition activity against C. perfringens and tolerance to acid and bile salts. The isolated bacteriocin-producing bacteria and/or bacteriocin have the potential to be used as probiotics in the livestock industry.

• Archives of Plastic Surgery
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• 제47권3호
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• pp.228-234
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• 2020

Background A patient's overall condition sometimes does not allow for the complete removal of a dead eschar or injured slough in cases involving a pressure-injury skin lesion. This frequently occurs in clinical practice, particularly in bedridden and older patients receiving home care or intensive care. Even after debridement, it is also difficult to manage open exudative wounds in these patients. Nevertheless, when a mature or immature eschar is treated without proper debridement, liquefaction necrosis underneath the eschar or slough tends to reveal a large, open wound with infectious exudates. We hypothesized that if the presence of any bacteria under the eschar can be evaluated and the progression of the presumed infection of the subeschar can be halted or delayed without creating an open wound, the final wound can be small, shallow, and uninfected. Methods Using a punch instrument, we performed 34 viable subeschar tissue cultures with a secure junction between the eschar and the normal skin. Results The bacterial study had 29 positive results. Based on these results and the patient's status, appropriate antibiotics could be selected and administered. The use of suitable antibiotics led to relatively shallow and small exposed wounds. Conclusions This procedure could be used to detect potentially pathogenic bacteria hidden under black or yellow eschars. Since subeschar infections are often accompanied by multidrug-resistant bacteria, the early detection of hidden infections and the use of appropriate antibiotics are expected to be helpful to patients.

• Journal of Dairy Science and Biotechnology
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• 제36권1호
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• pp.49-71
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• 2018

Heat treatment is the most popular processing technique in the dairy industry. Its main purpose is to destroy the pathogenic and spoilage bacteria in order to ensure that the milk is safe throughout its shelf life. The protease and lipase that are present in raw milk might reduce the quality of milk. Plasmin and protease, which are produced by psychrotrophic bacteria, are recognized as the main causes of the deterioration in milk flavor and taste during storage. The enzymes in raw milk can be inactivated by heat treatment. However, the temperature of inactivation varies according to the type of enzyme. For example, some Pseudomonas spp. produce heat-resistant proteolytic and lipolytic enzymes that may not be fully inactivated by the low temperature and long time (LTLT) treatment. These types of enzymes are inhibited only by the high temperature and short time (HTST) or ultra-high temperature (UHT) treatment of milk.

• Journal of Photoscience
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• 제11권2호
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• pp.55-59
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• 2004

The present investigation is an attempt to create an optimized protocol for a bactericidal modality of different powers of He-Ne laser radiation to eliminate periodontitis disease causing bacteria from dental plaques. Periodontitis is most prevalent infectious disease of men and caused by a limited number of Gram negative oral bacteria. Porphyromonas gingivalis and Streptococcus sanguis are the important bacteria responsible for periodontitis diseases. Effect on periodontitis disease causing bacteria were produced by the exposure of different powers of He-Ne laser light i.e. 9 mW, 17 mW and 26 mW of red colour of wavelength 632.8 nm in two different periods of time i.e. 10 min. and 20 min. in the presence of dye Methylene blue (MB) used as a photosensitizer. The results have been shown in terms of percentage inhibition of colony forming units (cfu.) of bacteria. This study has shown that maximum inhibition of cfu. were observed in Laser+MB-20 min. exposure time. This inhibition was followed by Laser+MB-10 min., but minimum inhibition was seen in Laser only at 10 min. exposure. In case of effect of methylene alone on the cfu. of bacteria, it was seen that MB have not shown more inhibition of cfu. and it had shown that the no. of cfu. are very similar to that of control. The above observation of the present study was seen in case of every 3 different type of used powers of laser for both the bacteria. Maximum percentage inhibition of cfu. were seen in case of 26mW powers of He-Ne laser, which was 67. 28% to 61.42% for Porphyromonas gingivalis and Streptococcus sanguis respectively. So, increasing the power of laser (safe range for dentistry is 3-30 mW) under conditions shows an increased percentage inhibition of cfu. Thus the present investigation may be a useful adjunct with mechanical debridement in the prevention of recolonization of subgingival lesions by pathogenic microorganisms which are harmful and drug resistant.