• Journal of Microbiology and Biotechnology
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• 제17권11호
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• pp.1743-1750
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• 2007

Two Gram-negative, nonmotile, coccobacilli, SW-$3^T$ and SW-$100^T$, were isolated from sea water of the Yellow Sea in Korea. Strains SW-$3^T$ and SW-$100^T$ contained ubiquinone-9 (Q-9) as the predominant respiratory lipoquinone and $C_{18:1}\;{\omega}9c$ and $C_{16:0}$ as the major fatty acids. The DNA G+C contents of strains SW-$3^T$ and SW- $100^T$ were 44.1 mol% and 41.9 mol%, respectively. A neighbor-joining tree based on l6S rRNA gene sequences showed that the two isolates fell within the evolutionary radiation enclosed by the genus Acinetobacter. Strains SW-$3^T$ and SW-$100^T$ exhibited a l6S rRNA gene similarity value of 95.7% and a mean DNA-DNA relatedness level of 9.2%. Strain SW-$3^T$ exhibited l6S rRNA gene sequence similarity levels of 93.5-96.9% to the validly described Acinetobacter species and fifteen Acinetobacter genomic species. Strain SW-$100^T$ exhibited l6S rRNA gene sequence similarity levels of less than 97.0% to the other Acinetobacter species except Acinetobacter towneri DSM $14962^T$ (98.0% similarity). Strains SW-$3^T$ and SW-$100^T$ exhibited mean levels of DNA-DNA relatedness of 7.3-l6.7% to the type strains of some phylogenetically related Acinetobacter species. On the basis of phenotypic, phylogenetic, and genetic data, strains SW-$3^T$ and SW-$100^T$ were classified in the genus Acinetobacter as two distinct novel species, for which the names Acinetobacter marinus sp. novo (type strain SW-$3^T$=KCTC $12259^T$=DSM $16312^T$) and Acinetobacter seohaensis sp. novo (type strain SW-$100^T$=KCTC $12260^T$=DSM $16313^T$) are proposed, respectively.

• 대한수의학회지
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• 제61권3호
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• pp.26.1-26.8
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• 2021

Acinetobacter is a bacteria found in the environment and clinical specimens, causing nosocomial infection and antimicrobial resistance (AMR) threats. This study examined the prevalence, species, and AMR characteristics of Acinetobacter isolated from surgical practice and the laboratory dog husbandry room environments (n = 235) at Rajamangala University of Technology Tawan-ok veterinary hospital during 2018-2019. The prevalence of Acinetobacter in the laboratory dog husbandry room and veterinary belongings were 2.55% and 0.43%, respectively. Species determination was Acinetobacter hemolyticus (2.13%) and Acinetobacter baumannii (0.43%) from environments in the laboratory dog husbandry room, and Acinetobacter junii (0.43%) from the shoes used in the surgical practice room. AMR was observed in both study environments and the specimens sent to the Veterinary Diagnostic Center. These isolates had a high resistant percentage to amoxicillin-clavulanic acid (84.62%), sulfamethoxazole-trimethoprim (61.54%), and cephalexin (53.85%) but were susceptible to imipenem. Compared to the isolates recovered from the clinical specimens, most isolates derived from environments exhibited multidrug resistance and shared correlated resistance patterns. These results highlight the need for sanitization in the dog husbandry room. Furthermore, the AMR results can be used as a preliminary baseline for studying AMR Acinetobacter contamination in animals and their environments.

• KSBB Journal
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• 제14권1호
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• pp.71-75
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• 1999

인 축적능이 우수한 균주를 자연계로부터 위노그라드스키 칼럼을 이용해 분리하여 Acinetobacter 속으로 동정하였고, Aci-netobacter CW3로 망명하였다. 인 축적균주의 배양초기조건은 $20^{\circ}C$. pH 7, 200rpm, 18.5mg $FO_4-P/\ell$가 최적임을 보였다. Acinetobacter CW3은 회분배양에서는 최적조건에서 12시간만에 인의 제거가 완료되었다. 이 균주는 호기조건에서는 인을 균주 내부에 과량 축적하고 첨가조건에서 인을 다시 방출함을 보였다.

• 대한미생물학회지
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• 제35권1호
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• pp.69-76
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• 2000

Members of the genus Acinetobacter are recognized as newer pathogens of the nosocomial infection with an increasing frequency in recent years. Strains that belonged to A. calcoaceticus A. baumannii complex (genomic species 1, 2, 3, and 13TU) were major groups associated with nosocomial infection. Phenotypic identification was unreliable and laborious method to classify Acinetobacter strains into 19 genomic species. Rapid and reliable identification of clinical isolates is essential to diagnosis and epidemiology of Acinetobacter. We investigated the suitability of amplified ribosomal DNA restriction analysis (ARDRA) to identify genomic species of 131 Acinetobacter isolates. The 16S rRNA genes (ribosomal DNA) were enzymatically amplified and the amplified PCR products were restricted independently with the enzymes, AluI, CfoI, and MboI. Genomic species of Acinetobacter was classified by the combinations of restriction patterns. The analysis was showed that restriction profiles were characteristic for each genomic species. One hundred fourteen isolates were identified as A. baumannii, twelve were identified as genomic species 13TU, and one was identified as genomic species 3. Four isolates were found to be unknown organisms. All of the isolates which were identified to A. baumannii by phenotypic tests were completely discriminated into A. baumannii and genomic species 13TU by ARDRA. This study demonstrates that ARDRA is a rapid and simple techniques for the identification of Acinetobacter species according to the genomic species.

• Journal of Microbiology and Biotechnology
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• 제31권5호
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• pp.733-739
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• 2021

Acinetobacter strains are widely present in the environment. Some antimicrobial-resistant strains of this genus have been implicated in infections acquired in hospitals. Genetic similarities have been reported between Acinetobacter strains in nosocomial infections and those isolated from foods. However, the antimicrobial resistance of Acinetobacter strains in foods, such as meat, remains unclear. This study initially aimed to isolate Campylobacter strains; instead, strains of the genus Acinetobacter were isolated from meat products, and their antimicrobial resistance was investigated. In total, 58 Acinetobacter strains were isolated from 381 meat samples. Of these, 32 strains (38.6%) were from beef, 22 (26.5%) from pork, and 4 (4.8%) from duck meat. Antimicrobial susceptibility tests revealed that 12 strains were resistant to more than one antimicrobial agent, whereas two strains were multidrug-resistant; both strains were resistant to colistin. Cephalosporin antimicrobials showed high minimal inhibitory concentration against Acinetobacter strains. Resfinder analysis showed that one colistin-resistant strain carried mcr-4.3; this plasmid type was not confirmed, even when analyzed with PlasmidFinder. Analysis of the contig harboring mcr-4.3 using BLAST confirmed that this contig was related to mcr-4.3 of Acinetobacter baumannii. The increase in antimicrobial resistance in food production environments increases the resistance rate of Acinetobacter strains present in meat, inhibits the isolation of Campylobacter strains, and acts as a medium for the transmission of antimicrobial resistance in the environment. Therefore, further investigations are warranted to prevent the spread of antimicrobial resistance in food products.

• 미생물학회지
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• 제43권1호
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• pp.66-71
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• 2007

JB10과 $JB15^{T}$ 균주들은 양강도 삼지연군의 북서부에 위치한 백두산에 있는 장려 폭포의 폭포수에서 분리되었다. 그람 음성의 호기성 균주로서, 약$0.9-1.6{\times}1.5-2.5\;{\mu}m$의 짧은 간균이었다. JB10, $JB15^{T}$ 균주들과 표준 균주들은 생리 생화학 특성 실험에서 서로 차이점을 보였다. JB10과 $JB15^{T}$ 균주들의 16S rDNA 염기서열을 분식한 결과 ${\gamma}-proteobacteria$에 속하였으며, Acinetobacter tandoii 4N13T (97.3%), Acinetobacter haemolyticus $ATCC17906^{T}$ (97.2%), Acinetobacter johnsonii $DSM6963^{T}$ (97.2%), Acinetobaoter junii $DSM6964^{T}$ (96.7%), Acinetobacter schindleri $LUH5832^{T}$ (97.0%) 및 Acinetobacter ursingii $LUH3792^{T}$ (96.6%)와 높은 유사도치 염기서열 상동성을 보여주었다. 그리고 이 외의 표준 균주들과는 93-96%의 염기서열 상동성을 보였다. 균체 지장산 분석 결과주요 지방산으로 $C_{18:1}\;{\omega}9c$와 $C_{16:1}\;{\omega}7c/C_{15:0}\;iso\;2OH$를 함유하고 있는 것을 확인하였으며, 흥미롭게도 $JB15^{T}$ 균주에서 $C_{19:1}\;iso\;I$이 검출되었다. 이상과 같이 생리 생화학적 특성, 16S rDNA 염기서열 분석 결과 및 균체 지방산분석 결과에서 선별된 JB10과 $JB15^{T}$ 균주들이 표준 균주들과는 다른 특성을 나타내는 것으로 확인되어 JB10 (=KEMC 52-093)과 $JB15^{T}$ ($=KEMC\; 52-094^{T}$) 균주들을 Acinetobacter koreensis sp. nov.로 동정하였다.

• Clinical and Experimental Pediatrics
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• 제49권5호
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• pp.494-499
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• 2006

목 적: Acinetobacter baumannii는 숙주 저항력이 저하된 고위험군에서 주요 원내 감염균으로 잘 알려져 있으나 A. baumannii 이외의 Acinetobacter species의 경우 드물게 감염과 연관된 것으로 받아들여지는 등 임상적 중요성과 원내 감염원으로써의 역학에 대해 알려진 바가 적다. 저자들은 신생아 집중치료실에서 A. baumannii가 아닌 것으로 확인된 Acinetobacter species에 의해 집단 발생한 패혈증 11례를 경험하였기에 이에 대한 임상적, 역학적 특징을 알고자 본 연구를 실시하였다. 방 법: 2004년 2월 4일부터 24일까지 일신기독병원 신생아 집중치료실에서 감염되었던 환아의 혈액에서 Acinetobacter species가 배양된 11례를 대상으로 임상적 특징을 조사하였고, 집단 발생의 역학을 조사하기 위해 두 차례에 걸쳐 의료진 및 환경 검체에 대한 배양을 실시하였으며, 항생제 감수성 검사를 통해 환아에서 배양된 균주가 동일 균주인지를 알고자 하였다. 결 과: 임상 양상은 발열, 수유 부진, 복부 팽만, 설사, 혈변, 구토, 빈호흡, 무호흡 등 다양하였으나 다른 원인에 의한 감염증과 비슷하였다. 집중 치료를 요하는 중증 경과를 보인 경우가 없었고 항생제 치료에 즉각적인 반응을 보이며 회복되어 A. baumannii 감염증에서 흔히 보이는 중증의 임상 증상과 높은 사망률(11-57%)과 비교하여 경한 경과를 보였다. 도관 관련 균혈증 2례, 도관 관련 균혈증 의증 9례로 말초 정맥 도관이 중요 유발 인자로 고려되었다. 감염의 역학을 알고자 두 차례에 걸쳐 의료진의 손과 환경 검체에 대한 배양 검사를 실시하였으나 동일 균주를 분리하는데는 실패하였다. 결 론: 우리의 연구를 통해 A. baumannii 이외의 Acinetobacter species의 경우 상대적으로 비병원성으로 여겨졌으나 임상 증상이 동반되면서 환자에서 배양되면 감염의 원인균임을 알 수 있었다.

• 생명과학회지
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• 제16권4호
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• pp.555-560
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• 2006

유용효소를 생산하는 균주를 가정하수로부터 분리하기 위하여 LBM, R2A, M9배지를 이용하여 다수의 균주를 분리하였다. 분리된 균주 중 1% tributyrin이 첨가된 배지에서 생육 활성대의 형성이 우수한 균주 1종을 최종적으로 선별하여 형태학적, 생리학적, 생화학적 특성을 관찰하였다. 16S rDNA 염기서열 분석결과 Acinetobacter Baumannii (99%)로 Acinetobacter 속에 속하는 균주임을 확인하고, Acinetobacter sp. BD5로 명명하였다. Acinetobacter sp. BD5는 $37^{\circ}C$와 $50^{\circ}C$에서 생육하는 것으로 보아 호열성 균주이며, 1% tributyrin과 oilve oil 첨가된 EL과 CE 고체배지와 Tween 20이 첨가된 LB 고체배지에서 생육활성대의 형성을 확인하여 이 균주가 lipolytic 효소를 생산하는 것으로 나타났다. 효소 활성의 최적 배양조건을 검토하고자 배양시간별 효소 활성을 측정한 결과, 배양 6시간 때인 대수 증식기에 가장 높은 효소활성을 나타내어 비교적 빠른 시간 내에 lipolytic 효소를 생성하는 것으로 나타났다. 또한 효소활성의 최적 온도는 $60^{\circ}C$로 $70-80^{\circ}C$에서 70%이상의 잔존활성을 보이는 것으로 나타나 Acinetobacter sp. BD5는 호열성 균주로 이 균주가 생산하는 lipolytic 효소도 내열성을 보이는 것으로 생각된다. 최적 pH는 9.0이며, pH 9.8-10.6범위에서 50% 이상의 활성이 유지되어 alkaline lipolytic 효소인 것으로 생각되어진다. Acinetobacter sp. BD5가 생산하는 lipolytic 효소는 비교적 넓은 pH 범위와 고온에서 활성이 유지되는 것으로 보아 폐유분해, 세제 합성과 유기물질 합성 등 생물공학분야와 산업적으로 잠재적 가치가 있을 것으로 생각된다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제7권6호
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• pp.335-339
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• 2002

Laboratory experiments were conducted using pure cultures of Acinetobacter under an-aerobic/aerobic cyclic conditions to explain the release and uptake of soluble phosphate in an activated sludge process showing enhanced biological phosphate removal (EBPR). Under anaerobic/aerobic cyclic conditions in a Sequencing Batch Reactor (SBR), COD uptake concurrent with soluble phosphate release by Acinetobacter was not significant during the anaerobic periods, indicating that EBPR would not be established in pure cultures. However Acinetobacter cells accumulated higher phosphate content (5.2%) in SBR than that obtained (4.3%) from batch experiments. These results suggest that Acinetobacter sp. may not follow the proposed pattern of behavior of poly-P bacteria in EBPR activated sludge Plants.

• 생약학회지
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• 제42권4호
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• pp.336-340
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• 2011

The aim of this study was to investigate the possible utilization of Zanthoxylum schinifolium as a source of antimicrobial agents. The antimicrobial effects of Zanthoxylum schinifolium extracts were investigated against Acinetobacter baumannii, which is a multi-drug resistant pathogen, and 5 other pathogenic microorganisms. The hexane extract of Zanthoxylum schinifolium was more effective than the ethyl acetate, n-butanol and methanol extracts which were active against Acinetobacter baumannii 25, with minimum inhibitory concentrations(MIC) ranging from 0.8 mg/ml to 1.6 mg/ml. Tetracycline had no effect on Acinetobacter baumanniii. The hexane extract was highly active against Candida albicans IFO 6258, with an MIC of 1.5 mg/ml. In contrast, the ethyl acetate, n-butanol and methanol extracts showed no activity against the 5 pathogenic microorganisms. Furthermore, a combination of hexane extract and ethyl acetate extract was significantly more active against the 5 Acinetobacter baumannii strains than n-butanol and methanol. These results suggest that Zanthoxylum schinifolium extracts have great potential as antimicrobial compounds against multi-drug resistant pathogens, and further studies are warranted.