• 대한미생물학회지
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• 제22권3호
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• pp.225-232
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• 1987

Authors studied on the isolation of V. damsela from sea water, fish and shellfish at the Keoje Hae keumkang on the southern sea and at Hongdo island and Heucksan island on the western sea of Korea from May to September in 1986. Authors investigated for the isolated strains to bacteriological identification, hemolysis about various erythrocytes and antibiotic susceptibilities. The results obtained were as follows: 1. V. damsela was isolated 14 strains from total 383 specimens; 233 cases of sea water, 40 cases of fish and 110 cases of shellfish, respectively. Eight strains were isolated from sea water and 6 strains were isolated from shellfish. 2. The biochemical characteristics which differentiate it from other Vibrio species were indole negative, ornithine negative, Voges-Proskauer positive, arginine positive, galactose positive, glucose positive, maltose positive, mannose positive, trehalose positive, and growth in nutrient broth with 1% to 6% NaCl. 3. On hemolysis reaction on blood agar media using human, rabbit and guinea pig erythrocytes, human erythrocytes were 11 strain positive, rabbit erythrocytes were 12 strain positive and guinea pig erythrocytes were 13 strain positive. 4. Senistivity test using with chemotherapeutic agents of "BioLab" Microbial Sensitivity Test Discs were generally sensitived to amikacin, ampicillin, cephalothin, chloramphenicol, clindamycin, erythromycin, gentamycin, kanamycin, methicillin, penicillin, streptomycin, tetracycline and tobramycin, respectively, but were resistant to lincomycin.

• Journal of Microbiology and Biotechnology
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• 제33권12호
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• pp.1692-1697
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• 2023

Staphylococcus aureus integrated with mecA gene, which codes for penicillin-binding protein 2a, is resistant to all penicillins and other beta-lactam antibiotics, resulting in poor treatment expectations in skin and soft tissue infections. The development of a simple, sensitive and portable biosensor for mecA gene analysis in S. aureus is urgently needed. Herein, we propose a dual-toehold-probe (sensing probe)-mediated exonuclease-III (Exo-III)-assisted signal recycling for portable detection of the mecA gene in S. aureus. When the target mecA gene is present, it hybridizes with the sensing probe, initiating Exo III-assisted dual signal recycles, which in turn release numerous "3" sequences. The released "3" sequences initiate catalytic hairpin amplification, resulting in the fixation of a sucrase-labeled H2 probe on the surface of magnetic beads (MBs). After magnet-based enrichment of an MB-H1-H2-sucrase complex and removal of a liquid supernatant containing free sucrase, the complex is then used to catalyze sucrose to glucose, which can be quantitatively detected by a personal glucose meter. With a limit of detection of 4.36 fM for mecA gene, the developed strategy exhibits high sensitivity. In addition, good selectivity and anti-interference capability were also attained with this method, making it promising for antibiotic tolerance analysis at the point-of-care.

• Journal of Microbiology and Biotechnology
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• 제34권4호
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• pp.854-862
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• 2024

Lactobacillus is a commonly used probiotic, and many researchers have focused on its stress response to improve its functionality and survival. However, studies on persister cells, dormant cells that aid bacteria in surviving general stress, have focused on pathogenic bacteria that cause infection, not Lactobacillus. Thus, understanding Lactobacillus persister cells will provide essential clues for understanding how Lactobacillus survives and maintains its function under various environmental conditions. We treated Lactobacillus strains with various antibiotics to determine the conditions required for persister formation using kill curves and transmission electron microscopy. In addition, we observed the resuscitation patterns of persister cells using single-cell analysis. Our results show that Lactobacillus creates a small population of persister cells (0.0001-1% of the bacterial population) in response to beta-lactam antibiotics such as ampicillin and amoxicillin. Moreover, only around 0.5-1% of persister cells are heterogeneously resuscitated by adding fresh media; the characteristics are typical of persister cells. This study provides a method for forming and verifying the persistence of Lactobacillus and demonstrates that antibiotic-induced Lactobacillus persister cells show characteristics of dormancy, sensitivity of antibiotics, same as exponential cells, multi-drug tolerance, and resuscitation, which are characteristics of general persister cells. This study suggests that the mechanisms of formation and resuscitation may vary depending on the characteristics, such as the membrane structure of the bacterial species.

• Asian-Australasian Journal of Animal Sciences
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• 제30권9호
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• pp.1340-1349
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• 2017

Objective: This study aimed to evaluate the microbiological and cellular milk profile for the diagnosis of subclinical mastitis in female buffaloes and to assess risk factors for predisposition of the disease. Methods: Analyses were carried out by standard plate count (SPC), identification of species and antibiotic resistance, somatic cell count (SCC), electrical electrical conductivity of milk (ECM), and lactoferrin content in milk. Teat cups were swabbed to evaluate risk factors, observing hyperkeratosis, milking vacuum pressure and cleanliness of the site. Hence, 30 female buffaloes were randomly selected (15 from a group in early lactation and 15 in late lactation). Results: The most common bacteria in the microbiological examination were Staphylococcus spp., Streptococcus spp. and Corynebacterium sp. In the antibiotic sensitivity test, 10 (58.82%) of the 17 antibiotics tested were sensitive to all isolates, and resistant bacteria were Streptococcus uberis, Streptococcus dysgalactiae, Streptococcus haemolyticus, and Escherichia coli. It was observed that positive samples in the microbiological examination showed total bacterial count between $9.10{\times}10^3$ to $6.94{\times}10^6$ colony forming units/mL, SCC between 42,000 to 4,320,000 cells/mL and ECM ranging from 1.85 to 7.40 mS/cm. It was also found that the teat cups had high microbial counts indicating poor hygiene, and even faults in the cleanliness of the animals' waiting room were observed. It is concluded that values of SCC above 537,000 cells/mL and ECM above 3.0 mS/mL are indications of mammary gland infection for this herd; however, the association of these values with a microbiological analysis is necessary to more accurately evaluate the health status of mammary glands with subclinical mastitis. Conclusion: Through phenotypic characterization of bacteria involved in the samples, the genera Staphylococcus spp., Streptococcus spp., and Corynebacterimum bovis were the most prevalent in this study. Faults in environment and equipment hygienization are factors that are directly associated with mastitis.

• 대한소아치과학회지
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• 제30권3호
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• pp.341-347
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• 2003

Smith-Magenis syndrome(이하 SMS)은 제 17번 상염색체의 부분적 결손으로 발생하는 다발성 선천적 기형 및 정신지체를 특징으로 하는 증후군으로 1 : 25,000의 빈도로 발생하는 것으로 알려져 있다. 이 증후군은 작은 키와 단두증(brachycephaly)을 동반한 편평한 중안면, 처진 입, 종종 두드러지게 붉은 뺨, 성인에서 돌출된 턱 등의 특징적인 얼굴 생김새, 만성이염, 청각 손상, 사시와 근시를 포함한 눈의 이상, 목 쉰 소리, 짧은 손가락과 발가락, 심장 질환, 비뇨기 질환, 척추 만곡, 비정상적 걸음걸이, 통각에 둔감함 등의 신체적 특징을 지닌다. 특히 유아기에는 토실토실한 아기 얼굴, 행복한 기분, 드문 울음소리, 낮은 근 긴장도, 섭식 장애 등의 특징이 있다. 수면 장애를 포함하여 언어 지체 및 발음 장애, 발달지체, 학습 장애, 정신지체, 활동항진과 자해, 폭발적 분노, 지속되는 짜증, 파괴적이고 공격적인 행동, 흥분성, 흥분시에 팔로 안거나 손을 끼우는 행동 등의 행동 발달적 특징을 나타낸다. 본 증례는 3세 3개월된 남아로 생후 10개월에 SMS를 진단받은 환자로 상악 좌측 제 1유구치의 통증을 주소로 본과에 내원하였으며, 임상 및 방사선학적으로 다발성 우식증을 보였으며, 소아과 주치의에게 의뢰한 결과 심내막염의 예방을 위한 항생제의 처치를 처방 받고, 환아의 행동 발달적 문제로 인해 물리적 속박의 방법 하에 외래에서 치료되었다. 이 증례를 통해 SMS라는 희귀한 증후군에 관하여 보고하고자 한다.

• 대한수의학회지
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• 제29권3호
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• pp.393-405
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• 1989

This study was carried out to treatment test for bovine mastitis by the determination of adenosine triphosphate (ATP) based on firefly bioluminescence. The results obtained are followed; 1. In the susceptibility test, cephalothin which looks the most effective were sensitive to Staphylococcus sp. (72.3%), Micrococcus sp. (84.2%), Streptococcus sp. (72.7%) and Gram positive bacilli (72.7%), Gram negative bacilli were sensitive to gentamicin (92.3%) and Yeast-like-fungi was the most sensitive to clotrimazole, and nystatin in order. 2. When the number of bacteria, such as Staphylococcus aureus, Candida tropicalis isolated from the mastitis milk were counted by conventional agar plating technique, and compared with the concentration of bacterial ATP, it gave a good linear relationship. The content of ATP per Staphylococcus aureus, cell was 3.1fM and Candida tropicalis showed the high level of A TP (90fM). 3. The ATP assay was applied to the determination of minimal inhibitory concentration (MIC) of various antibiotics. When Staphylococcus aureus was incubated in the presence of different concentration of tetracycline, erythromycin, kanamycin and streptomycin sulfate and the growth was monitored by the conventional agar plating technique and ATP assay, both methods shown the same results that they were 1mcg/ml, 2mcg/ml, 6.25mcg/ml and 8mcg/ml, respectively. 4. For the determination of susceptibility of sensitive and resistant Staphylococcus au reus isolated for the milk with mastitis to tetracycline, erythromycin kanamycin and streptomycin sulfate, the minimum time required for the test was determined by the assay of ATP every 30 minutes during incubation of 3 hours at $37^{\circ}C$. ATP concentration time curve calculated on both resistant and sensitive strains incubated 3 hours as the optimum time for the determination of susceptibilities of various antibiotics exemed. The ATP concentration of each test broth (antibiotic containing), expressed as a percentage of its own control brith (antibioticfree) indicated values of 30% to be indicative of each antibiotic sensitivity. Single time point ATP assay carried out on the various sensitive and resistant of Staphylococcus aureus to antibiotics examined after 3 hours at $37^{\circ}C$ correlated exactly with disc diffusion and MIC. 5. In the cure of intramammary treatment of bovine mastitis in lactating quarters, the cure rate of Staphylococcal mastitis showed to cephalexin (80%), cloxacillin and gentamicin (70%), ampicillin and oxytetracycline (60%), and Streptococcal mastitis showed to cephalexin (85%), penicillin (80%), cloxacillin and oxytetracycline (75%), and ampicillin (70%), but intramammary antimycotic drug (clotrimazol) were only a little effect about fungal mastitis.

• 한국미생물·생명공학회지
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• 제37권3호
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• pp.258-265
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• 2009

축산환경개선용 미생물 제품 중 시장점유율을 기준으로 상위제품 A, B,하위 제품 E, F와 현재 개발완료 되어진 C, D를 선정하여 생균수 측정과, 사료첨가용으로 사용이 금지된 항생제에 대한 내성 테스트를 실시하였다. 생균수 측정 결과 상위 점유율의 A, B사 제품은 표기상의 생균수와 일치하였으나, 하위 점유율을 차지하고 있는 E제품의 경우 함유균주나 효능에 대한 정보를 제공하고 않고 있을뿐더러 F사의 제품은 균수가 적게 측정되어 실제 표기사항과 일치하지 않았다. 항생제 내성실험결과 점유율에 따른 상관관계는 없었으나, B사를 제외한 제품의 대부분에서 내성균이 존재함을 확인하였다. Lincosimides 계열의 Lincomycicne과 Clindamycin의 경우 B사를 제외한 제품에서 내성균이 존재하였다. Penicillins 계열의 Amoxicillin, Ampicillin, Penicillin 및 Macrolide 계열의 Erythromycin 항생제는 B사와 E를 제외한 제품에서 내성균이 존재함을 확인하였다. Quinoline계열 Norploxacin 또한 B사와 E사를 제외한 제품에서 내성균을 보였으며 Neomycin의 항생제 또한 유사한 내성분포 결과를 나타내었다. Neomycin과 같은 Aminiglycosides계열의 Gentamycin, Streptomycin은 B사제품을 제외한 제품에서 내성을 나타내었다. 마지막으로 내성-균으로 사용 금지된 Tetracycline계열의 Oxytetracyclin은 12가지 항생제중 가장 높은 비율의 감수성을 나타내었으나 B, E사를 제외한 제품에서 내성균의 존재를 확인하였다. 실험결과 사용 금지된 항생제 품목임에도 불구하고 많은 제품에서 때 성균이 존재하였으며, 이에 따라 환경개선제 특성의 정확한 표기와 체계적인 유통 체계와 검증 과정이 필요하다고 사료된다.

• Pediatric Infection and Vaccine
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• 제8권1호
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• pp.90-93
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• 2001

목 적 : 소아 감염병 중 가장 흔한 상기도 감염의 원인이 되는 A군 연쇄구균 상기도 감염은 급성기 합병증 뿐만 아니라, 류마티열이나 사구체 신염과 같은 후기 합병증의 가능성 때문에 정확한 진단과 치료가 중요하다고 하겠다. A군 연쇄구균이 원인이 되는 상기도 감염은 5~30% 정도에 불과하나 실제 상기도 감염시 많은 임상의사들이 부적절한 항생제 사용을 하게되는 것을 볼 수 있다. 또한 항균제의 부적절한 사용에 따른 항균제 내성 세균이 증가추세에 있는 실정이고, 외래 상기도 감염 환자에게 있어서 항생제 투여 여부를 결정할 수 있는 당위성을 제공하는 신속검사에 대한 유용성을 알아보고자 한다. 방 법 : 2000년 10월부터 2001년 1월까지 경희의료원 소아과 외래와 마산파티마병원 소아과 외래를 방문하였던 상기도 감염 환아 중 임상적으로 인두 편도염이 의심되었던 87명을 대상으로 신속검사와 인두배양검사를 동시에 실시하였다. 환아로 부터 소독된 면봉을 이용하여 양쪽 편도와로 부터 검체를 2회 채취하여 신속검사와 혈액한천배지에 각각 접종하였다. 신속검사는 접종즉시 키트내 삽입된 지침서에 따라 시행하였고 혈액한천배지에 접종하였던 배지는 흔히 사용되는 방법으로 배양하여 두 검사의 일치율 유무를 검토하였다. 결 과 : 인두 편도염 증세를 보인 87명의 환아 중 균배양 검사에서 39명에서 A군 연쇄구균이 배양되었으며, 이중 신속검사에 대한 양성예측율은 92.3%(39명 중 36명)이었으며, 예민도는 81.8%(44명 중 36명)을 보였다. 신속검사의 특이도는 93.0%(43명 중 40명)이었으며, 음성 예측율은 83%(48명 중 40명)을 보였다. 결 론 : 신속검사의 양성 예측율과 특이도가 매우 높은 결과를 보였으며, 외래 상기도 감염 환자에서의 항생제 사용여부를 결정하는데 있어 간편하게 시행할 수 있는 방법이라고 생각된다.

• 생명과학회지
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• 제8권1호
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• pp.40-50
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• 1998

Staphylococuus aureus and Escherichia coli is increasingly responsible for outbreaks of nosocomial infection around the world. Because serious infections due to these organisms currently necessiate use of non-$\beta$-lactam antimicrobial therapy and because strains is ofen resistant to many antimicrobial agents, infections with this organism are difficult to treat. Isolated strains from post operaton wounds of PNU hospital patient were tested for the antimicrobial susceptibility, resistant pattern and combined action to the 6 antibiotics. The minimal inhibitory concentraction of each antibiotic anc antibiotics combining in various ratios were measured by checkerboard dilution method. the synergism was determined through calculating the fractional inhibitory concentraction index (FICI). In case of S. aureus, 15 strains was shown to be highly sensitive to streptomycin and 13 strains to cephalothin. In case of E. coli, it is excellent senstitive 16 strains, sensitive 4 strains on cefoperazone, as like S. aureus, and thus the sensitive is most to be 66%. As the result of gaining MIC from S. aureus upon agar dilution method, MIC$_{50}$ was 8$\mu$g/ml, MIC$_{90}$ was 16$\mu$g/ml and thus the streptomycine is shown to be lowest. In case of E, coli, S. MIC$_{50}$ was 4$\mu$g/ml, MIC$_{90}$ was 16$\mu$g/ml, in streptomycin and thus is shown to be lower than S. aureus. As the result of comparing the resistance aspect of combining the antibiotics on S. aureus and E. coli, the resistant strain can be known to be reduced to the large range more than each 40% than combining with only aminoglycoside-series or cephalosporine-series. As the result of combining aminoglycoside-series, streptomycin and cephalothin or cefuroxime sensitive to S. aureus and E. coli in the above mentioned results, the increase or imporovement of effect is over 73% and 80%, respectively, thus the case od combining 2 antibiotics is shown to be better in the effect. Isolated strains from operating wounds were for the antimicrobial susceptibility. In case of S. aureus 15 strains was shown to be sensitive very much on streptomycin. In case of E. coli it is excellent sensitive 16 strains. As the results of combining aminoglycosides-series, streptomycin and cephalosporine series, cephalothin and cefuroxime, the increase or improvement of effect is over 73%, thus case of combining 2 antibiotics is shown to be better in the effect.

• 한방안이비인후피부과학회지
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• 제35권3호
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• pp.48-65
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• 2022

Objectives : This study was conducted to find out the effectiveness and safety of herbal medicine eye drops on conjunctivitis. Methods : We searched randomized controlled trials on conjunctivitis through 10 DBs from the start to April 27, 2022. Study collection and data extraction, and evaluation of risk of bias were conducted by two independent researchers. The evaluation of the risk of bias in included RCTs was carried out by using Cochrane risk-of-bias tool. And the data synthesis was conducted by using Review Manager(RevMan, ver.5.4). Results : Total of 106 studies are researched and 7 studies of them are finally included. 1. The herbal medicine eye drops are more effective on than the western medicine eye drops, but the heterogeneity was very high. So we conducted sensitivity analysis and compared to the herbal medicine eye drops and the western medicine eye drops, the total effective rate was higher in the herbal medicine eye drops and the heterogeneity was somewhat reduced. 2. In the subgroup analysis, Fufang Xiongdan eye drops and Houttuynia cordata Thunb eye drops are more effective than the western medicine. It may represent substantial heterogeneity. 3. In the subgroup analysis, the herbal medicine eye drops are more effective than antibiotic and antiviral eye drops on acute bacterial conjunctivitis, but showed high heterogeneity. On the other hand, the herbal medicine eye drops are more effective than antibiotic and antiviral eyed drops on acute viral conjuctivitis and showed low heterogeneity. 4. In the subgroup analysis, we compared the effectiveness of herbal and western medicine eye drops according to total effectiveness rate evaluation methods. When comparing the studies calculating the total effective rate by the sum of 'Cured', 'Significantly Impaired', and 'Improved', the effective rate of the herbal medicine eye drops was higher than that of the western medicine eye drops, and the heterogeneity was very low. 5. In most studies, side effects of herbal medicine eye drops were absent or mild. Conclusions : This study shows that herbal medicine eye drops may be more effective than western medicine eye drops and have safety. But further researches are needed to resolve the heterogeneity of this study.