Journal of Microbiology

Journal Articles

Phenotypic and genomic characteristics of Brevibacterium zhoupengii sp. nov., a novel halotolerant actinomycete isolated from bat feces: Yuyuan Huang , Lingzhi Dong , Jian Gong , Jing Yang , Shan Lu , Xin-He Lai , Dong Jin , Qianni Huang , Ji Pu , Liyun Liu , Jianguo Xu; J. Microbiol. 2022;60(10):977-985. Published online August 19, 2022; DOI: https://doi.org/10.1007/s12275-022-2134-8

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Two strictly aerobic, Gram-staining-positive, non-spore-forming, regular rod-shaped (approximately 0.7 × 1.9 mm) bacteria (HY170T and HY001) were isolated from bat feces collected from Chongzuo city, Guangxi province (22°20􍿁54􍿂N, 106°49􍿁20􍿂E, July 2011) and Chuxiong Yi Autonomous Prefecture, Yunnan province (25°09􍿁10􍿂N, 102°04􍿁39􍿂E, October 2013) of South China, respectively. Optimal growth is obtained at 25–28°C (range, 4–32°C) on BHI-5% sheep blood plate with pH 7.5 (range, 5.0–10.0) in the presence of 0.5– 1.0% NaCl (w/v) (range, 0–15% NaCl [w/v]). The phylogenetic and phylogenomic trees based respectively on the 16S rRNA gene and 845 core gene sequences revealed that the two strains formed a distinct lineage within the genus Brevibacterium, most closely related to B. aurantiacum NCDO 739T (16S rRNA similarity, both 98.5%; dDDH, 46.7–46.8%; ANI, 91.9–92.1%). Strain HY170T contained MK-8(H2), diphosphatidylglycerol (DPG) and phosphatidylglycerol (PG), galactose and ribose as the predominant menaquinone, major polar lipids, and main sugars in the cell wall teichoic acids, respectively. The meso-diaminopimelic acid (meso-DAP) was the diagnostic diamino acid of the peptidoglycan found in strain HY170T. Anteiso-C15:0 and anteiso-C17:0 were the major fatty acids (> 10%) of strains HY170T and HY001, with anteiso-C17:1A predominant in strain HY170T but absent in strain HY001. Mining the genomes revealed the presence of secondary metabolite biosynthesis gene clusters encoding for non-alpha poly-amino acids (NAPAA), ectoine, siderophore, and terpene. Based on results from the phylogenetic, chemotaxonomic and phenotypic analyses, the two strains could be classified as a novel species of the genus Brevibacterium, for which the name Brevibacterium zhoupengii sp. nov. is proposed (type strain HY170T = CGMCC 1.18600T = JCM 34230T).

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Antagonistic Behavior of Streptomyces chartreuse against Pathogenic Bacteria in Ricinus communis L.
Bhoomi N. Patel, Priti Patel, Gayatri Patel
Biosciences Biotechnology Research Asia.2024; 21(1): 185. CrossRef
Functional genomics and taxonomic insights into heavy metal tolerant novel bacterium Brevibacterium metallidurans sp. nov. NCCP-602T isolated from tannery effluent in Pakistan
Sadia Manzoor, Saira Abbas, Sobia Zulfiqar, Hong-Chuan Wang, Min Xiao, Wen-Jun Li, Muhammad Arshad, Iftikhar Ahmed
Antonie van Leeuwenhoek.2024;[Epub] CrossRef
Description of Ornithinimicrobium cryptoxanthini sp. nov., a Novel Actinomycete Producing β-cryptoxanthin Isolated from the Tongtian River Sediments
Yuyuan Huang, Yifan Jiao, Sihui Zhang, Yuanmeihui Tao, Suping Zhang, Dong Jin, Ji Pu, Liyun Liu, Jing Yang, Shan Lu
Journal of Microbiology.2023; 61(4): 379. CrossRef
Morphological and genomic characteristics of two novel actinomycetes, Ornithinimicrobium sufpigmenti sp. nov. and Ornithinimicrobium faecis sp. nov. isolated from bat faeces (Rousettus leschenaultia and Taphozous perforates)
Yuyuan Huang, Suping Zhang, Yuanmeihui Tao, Jing Yang, Shan Lu, Dong Jin, Ji Pu, Wenbo Luo, Han Zheng, Liyun Liu, Jia-fu Jiang, Jianguo Xu
Frontiers in Cellular and Infection Microbiology.2023;[Epub] CrossRef

Comparative analysis of type 2 diabetes-associated gut microbiota between Han and Mongolian people: Shu-chun Li , Yao Xiao , Ri-tu Wu , Dan Xie , Huan-hu Zhao , Gang-yi Shen , En-qi Wu; J. Microbiol. 2021;59(7):693-701. Published online May 15, 2021; DOI: https://doi.org/10.1007/s12275-021-0454-8

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Abstract

Due to the different rates of diabetes in different ethnic groups and the structural differences in intestinal microbiota, this study evaluated the changes in diabetes-related intestinal microbiota in two ethnic groups. Fifty-six stool samples were collected from subjects from the Han and Mongolian ethnic groups in China, including participants without diabetes (non-diabetic, ND) and with type 2 diabetes (T2D). The 16S rDNA gene V3 + V4 area was extracted from microbiota, amplified by PCR, and used to perform high-throughput sequencing and screen differential microbiota associated with ethnicity. The results showed that there were 44 T2D-related bacterial markers in the Han subjects, of which Flavonifractor, Alistipes, Prevotella, Oscillibacter, Clostridium XlVa, and Lachnospiracea_incertae_sedis were most closely related to diabetes. There were 20 T2D-related bacterial markers in the Mongolian subjects, of which Fastidiosipila and Barnesiella were most closely related to diabetes. The common markers of T2D bacteria in the two ethnic groups were Papillibacter and Bifidobacterium. There were 17 metabolic pathways with significant differences between the ND and T2D groups in the Han group, and 29 metabolic pathways in the Mongolian group. The glutamatergic metabolic pathway was the only common metabolic pathway in two ethnic groups. The composition and function of diabetes-related bacteria were significantly different among the different ethnic groups, which suggested that the influence of ethnic differences should be fully considered when studying the association between diabetes and bacteria. In addition, the common bacterial markers found in diabetic patients of different ethnic groups in this study can be used as potential targets to study the pathogenesis and treatment of diabetes.

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Pentachlorophenol increases diabetes risk by damaging β-cell secretion and disrupting gut microbial-related amino acids and fatty acids biosynthesis
Muke Han, Jie Yin, Xinyi Wang, Runhui Yang, Zhong Dong, Junyu Ning, Yajun Xu, Bing Shao
Journal of Hazardous Materials.2024; 480: 136103. CrossRef
Improvement of glucose metabolism disorder by wheat dietary fibre depended on the intake mode and regulated through TLRs/NF-κB/TNF pathway in db/db mice
Xinguo Liu, Shaojie Pang, Aoxiang Li, Yong Wang, Wei Fang, Wentao Qi
Food and Agricultural Immunology.2024;[Epub] CrossRef
Chemical modifications of xylan from sugarcane bagasse and their regulatory effects on gut microbiota in mice
Guozhu Zhang, Yuan Guan, Xin Zhang, Jing Li, Haishan Chen, Li Zhou, Jun Liang, Xia Li
Journal of Carbohydrate Chemistry.2024; 43(3): 90. CrossRef
Tangshen Formula alleviates inflammatory injury against aged diabetic kidney disease through modulating gut microbiota composition and related amino acid metabolism
Dan-Qian Chen, Hao-Jun Zhang, Wen Zhang, Kai Feng, Hui Liu, Hai-Ling Zhao, Ping Li
Experimental Gerontology.2024; 188: 112393. CrossRef
Differences in gut microbiota and its metabolic function among different fasting plasma glucose groups in Mongolian population of China
Yanchao Liu, Mingxiao Wang, Wuyuntana Li, Yumin Gao, Hailing Li, Ning Cao, Wenli Hao, Lingyan Zhao
BMC Microbiology.2023;[Epub] CrossRef
Bi-Directional Interactions between Glucose-Lowering Medications and Gut Microbiome in Patients with Type 2 Diabetes Mellitus: A Systematic Review
Ruolin Li, Fereshteh Shokri, Alejandro Rincon, Fernando Rivadeneira, Carolina Medina-Gomez, Fariba Ahmadizar
Genes.2023; 14(8): 1572. CrossRef
Microbe-Disease Association Prediction Using RGCN Through Microbe-Drug-Disease Network
Yueyue Wang, Xiujuan Lei, Yi Pan
IEEE/ACM Transactions on Computational Biology and Bioinformatics.2023; 20(6): 3353. CrossRef
Longitudinal Characterization of the Gut Microbiota in the Diabetic ZDSD Rat Model and Therapeutic Potential of Oligofructose
Savanna N. Weninger, Angela Ding, Elizabeth N. Browne, Morgan L. Frost, Gabriele Schiro, Daniel Laubitz, Frank A. Duca
Metabolites.2023; 13(5): 660. CrossRef
Effect of Benaglutide on Gut Microbiota and Fecal Metabolites in Patients with Type 2 Diabetes Mellitus
Chen-Yu Han, Xiao-Mei Ye, Jia-Ping Lu, Hai-Ying Jin, Ping Wang, Wei-Wei Xu, Min Zhang
Diabetes, Metabolic Syndrome and Obesity.2023; Volume 16: 2329. CrossRef
Alteration of intestinal microbiota is associated with diabetic retinopathy and its severity: Samples collected from southeast coast Chinese
Xue-Mei Gu, Chao-Yin Lu, Jian Pan, Jian-Zhong Ye, Qi-Han Zhu
World Journal of Diabetes.2023; 14(6): 862. CrossRef
Progress in research on gut microbiota in ethnic minorities in China and consideration of intervention strategies based on ethnic medicine: A review
Rong Chen, Zhong-Yu Duan, Xiao-Hua Duan, Qing-Hua Chen, Jin Zheng
Frontiers in Cellular and Infection Microbiology.2022;[Epub] CrossRef
Effects of Oral Glucose-Lowering Agents on Gut Microbiota and Microbial Metabolites
Dongmei Wang, Jieying Liu, Liyuan Zhou, Qian Zhang, Ming Li, Xinhua Xiao
Frontiers in Endocrinology.2022;[Epub] CrossRef
Depletion of gut secretory immunoglobulin A coatedLactobacillus reuteriis associated with gestational diabetes mellitus-related intestinal mucosal barrier damage
Haowen Zhang, Ce Qi, Yuning Zhao, Mengyao Lu, Xinyue Li, Jingbo Zhou, Hongyang Dang, Mengjun Cui, Tingting Miao, Jin Sun, Duo Li
Food & Function.2021; 12(21): 10783. CrossRef
The Microbiota Profile Analysis of Combined Periodontal-Endodontic Lesions Using 16S rRNA Next-Generation Sequencing
Ping Sun, Zhiyong Guo, Daiping Guo, Jian Wang, Tingting Wu, Tingjun Li, Jiannan Liu, Xinhua Liu, Jôice D. Corrêa
Journal of Immunology Research.2021; 2021: 1. CrossRef

Research Support, Non-U.S. Gov'ts

Deodorization of Pig Slurry and Characterization of Bacterial Diversity Using 16S rDNA Sequence Analysis: Ok-Hwa Hwang , Sebastian Raveendar , Young-Ju Kim , Ji-Hun Kim , Tae-Hun Kim , Dong-Yoon Choi , Che Ok Jeon , Sung-Back Cho , Kyung-Tai Lee; J. Microbiol. 2014;52(11):918-929. Published online October 31, 2014; DOI: https://doi.org/10.1007/s12275-014-4251-5

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Abstract

The concentration of major odor-causing compounds including phenols, indoles, short-chain fatty acids (SCFAs) and branched chain fatty acids (BCFAs) in response to the addition of powdered horse radish (PHR) and spent mushroom compost (SMC) was compared with control nontreated slurry (CNS) samples. A total of 97,465 rDNAs sequence reads were generated from three different samples (CNS, n = 2; PHR, n = 3; SMC, n = 3) using bar-coded pyrosequencing. The number of operational taxonomic units (OTUs) was lower in the PHR slurry compared with the other samples. A total of 11 phyla were observed in the slurry samples, while the phylogenetic analysis revealed that the slurry microbiome predominantly comprised members of the Bacteroidetes, Firmicutes, and Proteobacteria phyla. The rarefaction analysis showed the bacterial species richness varied among the treated samples. Overall, at the OTU level, 2,558 individual genera were classified, 276 genera were found among the three samples, and 1,832 additional genera were identified in the individual samples. A principal component analysis revealed the differences in microbial communities among the CNS, PHR, and SMC pig slurries. Correlation of the bacterial community structure with the Kyoto Encyclopedia of Genes and Genomes (KEGG) predicted pathways showed that the treatments altered the metabolic capabilities of the slurry microbiota. Overall, these results demonstrated that the PHR and SMC treatments significantly reduced the malodor compounds in pig slurry (P < 0.05).

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Impact of Bacillus subtilis on manure solids, odor, and microbiome
Okhwa Hwang, Yeo-Myeong Yun, Steven Trabue
Journal of Environmental Management.2023; 333: 117390. CrossRef
Isolation and identification of proteolytic bacteria from pig sludge and protease activity determination
S Hamdani, N Asstiyani, D Astriany, M Singgih, S Ibrahim
IOP Conference Series: Earth and Environmental Science.2019; 230: 012095. CrossRef
The gut bacteria across life stages in the synanthropic fly Chrysomya megacephala
Xiaoyun Wang, Qiao Gao, Wanqiang Wang, Xiaoping Wang, Chaoliang Lei, Fen Zhu
BMC Microbiology.2018;[Epub] CrossRef
Bacterial community composition and diversity uncovered in experimental sludge treatment reed bed systems with different swine slurry hydraulic loadings
Paula Arroyo, Luis E. Sáenz de Miera, Jorge Falagán, Gemma Ansola
Ecological Engineering.2018; 123: 175. CrossRef
Effect of pH on soil bacterial diversity
Sun-Ja Cho, Mi-Hee Kim, Young-Ok Lee
Journal of Ecology and Environment.2016;[Epub] CrossRef
Indole: a signaling molecule or a mere metabolic byproduct that alters bacterial physiology at a high concentration?
Jisun Kim, Woojun Park
Journal of Microbiology.2015; 53(7): 421. CrossRef
Application of Next Generation Sequencing to Investigate Microbiome in the Livestock Sector
Minseok Kim, Youlchang Baek, Young Kyoon Oh
Journal of Animal Environmental Science.2015; 21(3): 93. CrossRef
Survival of free-living Acholeplasma in aerated pig manure slurry revealed by 13C-labeled bacterial biomass probing
Dai Hanajima, Tomo Aoyagi, Tomoyuki Hori
Frontiers in Microbiology.2015;[Epub] CrossRef

Phenotypic and Phylogenetic Analysis of Lactic Acid Bacteria Isolated from Forage Crops and Grasses in the Tibetan Plateau: Huili Pang , Zhongfang Tan , Guangyong Qin , Yanping Wang , Zongwei Li , Qingsheng Jin , Yimin Cai; J. Microbiol. 2012;50(1):63-71. Published online February 27, 2012; DOI: https://doi.org/10.1007/s12275-012-1284-5

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Abstract: A total of 140 lactic acid bacteria (LAB) strains were isolated from corn, alfalfa, clover, sainfoin, and Indian goosegrass in the Tibetan Plateau. According to phenotypic and chemotaxonomic characteristics, 16S rDNA sequence, and recA gene PCR amplification, these LAB isolates were identified as belonging to five genera and nine species. Corn contained more LAB species than other forage crops. Leuconostoc pseudomesenteroides, Lactococcus lactis subsp. lactis, Lactobacillus brevis, and Weissella paramesenteroides were dominant members of the LAB population on alfalfa, clover, sainfoin, and Indian goosegrass, respectively. The comprehensive 16S rDNA and recA-based approach effectively described the LAB community structure of the relatively abundant LAB species distributed on different forage crops. This is the first report describing the diversity and natural populations of LAB associated with Tibetan forage crops, and most isolates grow well at or below 10°C. The results will be valuable for the future design of appropriate inoculants for silage fermentation in this very cold area.

Journal Article

Molecular Identification of Fecal Pollution Sources in Water Supplies by Host-Specific Fecal DNA Markers and Terminal Restriction Fragment Length Polymorphism Profiles of 16S rRNA Gene: Ju-Yong Jeong , Kyung-Ik Gil , Kyong-Hee Lee , Jong-Ok Ka; J. Microbiol. 2008;46(6):599-607. Published online December 24, 2008; DOI: https://doi.org/10.1007/s12275-008-0174-3

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Abstract: Specific fecal DNA markers were investigated for major pollution sources, cow, human, and pig, and occurrence of the identified markers was analyzed in river waters using Terminal Restriction Fragment Length Polymorphism (T-RFLP) techniques and sequencing of 16S rDNA of Bacteroides-Prevotella. The unique and specific DNA markers for cow and human were identified as a 222 bp and 60 bp peak in HaeIII T-RFLP profiles, respectively, and the pig-specific marker was not identified but the unique T-RFLP profile of pig could be used as a substitution. Human-specific marker was detected in most of the river waters tested (92.1%) and T-RFLP profiles of river waters were shown to be similar to those of human feces. Cluster analysis of T-RFLP data showed that the fecal sources were multiple (human plus cow and human plus dairy cow) in most of the river waters. The phylogenetic analysis for the clones recovered from the fecal and water samples showed that the clones from cow formed a discreet cluster from those of other sources. The other clones from human, pig, and river water formed two groups all together. The results of this study could be used to identify and control the fecal pollution source in the bodies of water in Korea.

Research Support, Non-U.S. Gov'ts

An Examination of the Bacteriophages and Bacteria of the Namib Desert: Eric Prestel , Sylvie Salamitou , Michael S. DuBow; J. Microbiol. 2008;46(4):364-372. Published online August 31, 2008; DOI: https://doi.org/10.1007/s12275-008-0007-4

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Abstract: Bacteria and their viruses (called bacteriophages, or phages), have been found in virtually every ecological niche on Earth. Arid regions, including their most extreme form called deserts, represent the single largest ecosystem type on the Earth''s terrestrial surface. The Namib desert is believed to be the oldest (80 million years) desert. We report here an initial analysis of bacteriophages isolated from the Namib desert using a combination of electron microscopy and genomic approaches. The virus-like particles observed by electron microscopy revealed 20 seemingly different phage-like morphologies and sizes belonging to the Myoviridae and Siphoviridae families of tailed phages. Pulsed-field gel electrophoresis revealed a majority of phage genomes of 55~65 kb in length, with genomes of approximately 200, 300, and 350 kb also observable. Sample sequencing of cloned phage DNA fragments revealed that approximately 50% appeared to be of bacterial origin. Of the remaining DNA sequences, approximately 50% displayed no significant match to any sequence in the databases. The majority of the 16S rDNA sequences amplified from DNA extracted from the sand displayed considerable (94~98%) homology to members of the Firmicutes, and in particular to members of the genus Bacillus, though members of the Bacteroidetes, Planctomycetes, Chloroflexi, and delta-Proteobacteria groups were also observed.

Rapid Detection of Virulence Factors of Aeromonas Isolated from a Trout Farm by Hexaplex-PCR: In-Young Nam , Kiseong Joh; J. Microbiol. 2007;45(4):297-304.; DOI: https://doi.org/2569 [pii]

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Abstract: The detection of virulence factors of Aeromonas is a key component in determining potential pathogenicity because these factors act multifunctionally and multifactorially. In this study water samples were collected from a trout farm on a seasonal basis, and diseased fish and Aeromonas species were isolated and identified. For rapid detection of six virulence factors of isolated Aeromonas, a hexaplex-polymerase chain reaction (hexaplex-PCR) assay was used. The detected virulence factors include aerolysin (aer), GCAT (gcat), serine protease (ser), nuclease (nuc) lipase (lip) and lateral flagella (laf). The dominant strain found in our isolates was Aeromonas sobria, and the dominant virulence factors were aer and nuc for all seasons. We confirmed that A. sobria and two of the virulence genes (aer and nuc) are related. We proposed a method by which one can identify the major strains of Aeromonas: A. hydrophila, A. sobria, A. caviae, and A. veronii, using hexaplex-PCR.

Isolation and Characterization of the Mutans Streptococci from the Dental Plaques in Koreans: So Young Yoo , Seon Joo Park , Dong Ki Jeong , Kwang-Won Kim , Sung-Hoon Lim , Sang-Ho Lee , Son-Jin Choe , Young-Hyo Chang , Insoon Park , Joong-Ki Kook; J. Microbiol. 2007;45(3):246-255.; DOI: https://doi.org/2535 [pii]

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Abstract: Mutans streptococci have been implicated as cariogenic bacteria in dental caries because they can produce high levels of dental caries-causing lactic acid and extracellular polysaccharide. The aim of this study was to isolate and characterize the mutans streptococci from the dental plaque obtained from Koreans. The dental plaque samples were collected from the anterior and molar teeth of both jaws in 155 subjects (aged 2 to 33.2 years, average age 13.7±4.7 years). The samples were diluted by 100-fold in 1x PBS and plated on mitis-salivarius bacitracin (MSB) agar plates. The mutans streptococci grown on MSB plates were screened by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) targeting dextranase gene (dex). The mutans streptococci were identified at the species level using a 16S rDNA sequencing comparison method. The biochemical tests were carried out to biotype the mutans streptococci. Ninety-five strains of the mutans streptococci out of 358 colonies, which were derived from 141 subjects, were isolated. Of them, 77 strains and 18 strains were Streptococcus mutans and Streptococcus sobrinus, respectively. The biotyping data showed that 62, 1, 20, 10, and 2 strains were biotypes I, II, IV, V and variant, respectively. Of the two strains of variant biotype, one strains was similar to biotype IV except that it was positive to the arginine hydrolysis test. We considered this one strain a new biotype, and classified it as biotype VII. In conclusion, S. mutans and its biotype I was most frequently isolated in Korean dental plaque. The mutans streptococci strains isolated in this study might be useful for the study of the pathogenesis and the prevention of dental caries.

Journal Article

Kosinostatin, a Major Secondary Metabolite Isolated from the Culture Filtrate of Streptomyces violaceusniger Strain HAL64: Moustafa Y. El-Naggar; J. Microbiol. 2007;45(3):262-267.; DOI: https://doi.org/2533 [pii]

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Abstract: During a screening program, an actinomycete strain isolated from the Egyptian soil was investigated for its potential to show antimicrobial activity. The identification of this isolate was performed according to spore morphology and cell wall chemo-type, which suggested that this strain is a streptomycete. Further cultural, physiological characteristics and the analysis of the nucleotide sequence of the 16S rRNA gene (1480 bp) of this isolate indicated that this strain is identical to Streptomyces violaceusniger (accession number EF063682) and then designated S. violaceusniger strain HAL64. In its culture supernatant, this organism could produce one major compound strongly inhibits the growth of Gram-positive but the inhibition of Gram-negative indicator bacteria was lower. The antibiotic was separated by silica gel column chromatography and then purified on a sephadex LH-20 column and finally the purity was checked by HPLC. The chemical structure of the purified compound was determined using spectroscopic analyses (molecular formula of C33H32N2O10 and molecular weight of 617.21) and found to be identical to the kosinostatin, a quinocycline antibiotic which is known to be produced by Micromonspora sp. TP-A0468 (Igarashi et al., 2002) and to quinocycline B isolated from Streptomyces aureofaciens (Celmer et al., 1958). Although the antibiotic is known, the newly isolated strain was able to produce the antibiotic as a major product providing an important biotechnological downstream advantage.

Research Support, Non-U.S. Gov'ts

Comparison of Bacterial Composition between Human Saliva and Dental Unit Water System: Eun-Hyoung Jeon , Ji-Hye Han , Tae-Young Ahn; J. Microbiol. 2007;45(1):1-5.; DOI: https://doi.org/2500 [pii]

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Abstract: The bacterial compositions between the dental unit water system and human saliva were characterized and compared by direct sequence analysis of 16S rDNA clone libraries. Based on the species richness estimation, bacterial diversity in the dental unit water system (DUW) was more diverse than that of the human saliva (HS). The Chao1 estimates of species richness in HS and DUW samples were 12.0 and 72.4, respectively. The total numbers of OTUs observed in the combined libraries accounted for 83% (HS) and 59% (DUW) of the Chao1 diversity estimate as defined at the 80% similarity threshold. Based on the sequence analysis, the phylum Proteobacteria was the major group in both clone libraries at phylum level. DUW clone library contained 80.0% Proteobacteria, 8.0% Bacteroides, 4.0% Nitrospira, 4.0% Firmicutes, 2.0% Planctomycetes and 2.0% Acidobacteria. On the other hand, human saliva (HS) clone library contained 55.5% Proteobacteria, 36.1% Firmicutes and 8.4% Bacteroides. The majority of bacteria identified belonged to phylum Proteobacteria in both samples. In dental unit water system (DUW), Alphaproteobacteria was detected as the major group. There was no evidence of the bacterial contamination due to a dental treatment. Most sequences were related to microorganisms derived from biofilm in oligotrophic environments.

Archaeal Communities in Mangrove Soil Characterized by 16S rRNA Gene Clones: Bing Yan , Kui Hong , Zi-Niu Yu; J. Microbiol. 2006;44(5):566-571.; DOI: https://doi.org/2439 [pii]

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Abstract: An archaeal 16S rRNA gene library was constructed from mangrove soil. Phylogenetic analysis revealed archaea in mangrove soil including the Crenarchaeota (80.4%) and Euryarchaeota (19.6%) phyla. The archaeal community in mangrove soil appears to be a mixture of organisms found in a variety of environments with the majority being of marine origin.

A Bacterium Belonging to the Burkholderia cepacia Complex Associated with Pleurotus ostreatus: Ricardo Yara , Walter Maccheroni Junior , Jorge Horii , Joao Lucio Azevedo; J. Microbiol. 2006;44(3):263-268.; DOI: https://doi.org/2387 [pii]

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Abstract: Pleurotus ostreatus is a widely cultivated white-rot fungus. Owing to its considerable enzymatic versatility P. ostreatus has become the focus of increasing attention for its possible utility in biobleaching and bioremediation applications. Interactions between microorganisms can be an important factor in those processes. In this study, we describe the presence of a bacterial species associated with P. ostreatus strain G2. This bacterial species grew slowly (approximately 30 days) in theliquid and semi-solid media tested. When P. ostreatus was inoculated in solid media containing Tween 80 or Tween 20, bacterial microcolonies were detected proximal to the fungal colonies, and the relevant bacterium was identified via the analysis of a partial 16S rDNA sequence; it was determined to belong to the Burkholderia cepacia complex, but was not closely related to other fungus-isolated Burkholderiaceae. New specific primers were designed, and confirmed the presence of in vitro P. ostreatus cultures. This is the first time that a bacterial species belonging to the B. cepacia complex has been found associated with P. ostreatus.

Molecular Analysis of Colonized Bacteria in a Human Newborn Infant Gut: Hee-Kyung Park , Sung-Sub Shim , Su-Yung Kim , Jae-Hong Park , Su-Eun Park , Hak-Jung Kim , Byeong-Chul Kang , Cheol-Min Kim; J. Microbiol. 2005;43(4):345-353.; DOI: https://doi.org/2255 [pii]

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Abstract: The complex ecosystem of intestinal microflora is estimated to harbor approximately 400 different microbial species, mostly bacteria. However, studies on bacterial colonization have mostly been based on culturing methods, which only detect a small fraction of the whole microbiotic ecosystem of the gut. To clarify the initial acquisition and subsequent colonization of bacteria in an infant within the few days after birth, phylogenetic analysis was performed using 16S rDNA sequences from the DNA isolated from feces on the 1st, 3rd, and 6th day. 16S rDNA libraries were constructed with the amplicons of PCR conditions at 30 cycles and 50^oC annealing temperature. Nine independent libraries were produced by the application of three sets of primers (set A, set B, and set C) combined with three fecal samples for day 1, day 3, and day 6 of life. Approximately 220 clones (76.7%) of all 325 isolated clones were characterized as known species, while other 105 clones (32.3%) were characterized as unknown species. The library clone with set A universal primers amplifying 350 bp displayed increased diversity by days. Thus, set A primers were better suited for this type of molecular ecological analysis. On the first day of the life of the infant, Enterobacter, Lactococcus lactis, Leuconostoc citreum, and Streptococcus mitis were present. The largest taxonomic group was L. lactis. On the third day of the life of the infant, Enterobacter, Enterococcus faecalis, Escherichia coli, S. mitis, and Streptococcus salivarius were present. On the sixth day of the life of the infant, Citrobacter, Clostridium difficile, Enterobacter sp., Enterobacter cloacae, and E. coli were present. The largest taxonomic group was E. coli. These results showed that microbiotic diversity changes very rapidly in the few days after birth, and the acquisition of unculturable bacteria expanded rapidly after the third day.

Isolation and Characterization of Bacteria Associated with Two Sand Dune Plant Species, Calystegia soldanella and Elymus mollis: Myung Soo Park , Se Ra Jung , Myoung Sook Lee , Kyoung Ok Kim , Jin Ok Do , Kang Hyun Lee , Seung Bum Kim , Kyung Sook Bae; J. Microbiol. 2005;43(3):219-227.; DOI: https://doi.org/2223 [pii]

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Abstract: Little is known about the bacterial communities associated with the plants inhabiting sand dune ecosystems. In this study, the bacterial populations associated with two major sand dune plant species, Calystegia soldanella (beach morning glory) and Elymus mollis (wild rye), growing along the costal areas in Tae-An, Chungnam Province, were analyzed using a culture-dependent approach. A total of 212 bacteria were isolated from the root and rhizosphere samples of the two plants, and subjected to further analysis. Based on the analysis of the 16S rDNA sequences, all the bacterial isolates were classified into six major phyla of the domain Bacteria. Significant differences were observed between the two plant species, and also between the rhizospheric and root endophytic communities. The isolates from the rhizosphere of the two plant species were assigned to 27 different established genera, and the root endophytic bacteria were assigned to 21. Members of the phylum Gammaproteobacteria, notably the Pseudomonas species, comprised the majority of both the rhizospheric and endophytic bacteria, followed by members of Bacteroidetes and Firmicutes in the rhizosphere and Alphaproteobacteria and Bacteroidetes in the root. A number of isolates were recognized as potentially novel bacterial taxa. Fifteen out of 27 bacterial genera were commonly found in the rhizosphere of both plants, which was comparable to 3 out of 21 common genera in the root, implying the host specificity for endophytic populations. This study of the diversity of culturable rhizospheric and endophytic bacteria has provided the basis for further investigation aimed at the selection of microbes for the facilitation of plant growth.

Journal Article

Prevalence of Putative Periodontopathogens in Subgingival Dental Plaques from Gingivitis Lesions in Korean Orthodontic Patients: Seung Mi Lee , So Young Yoo , Hwa-Sook Kim , Kwang-Won Kim , Young-Joo Yoon , Sung-Hoon Lim , Hee-Young Shin , Joong-Ki Kook; J. Microbiol. 2005;43(3):260-265.; DOI: https://doi.org/2215 [pii]

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Abstract: The objective of this study was to detect and compare the presence of periodontopathogens in the subgingival plaques of gingivitis lesions in adults who wore fixed orthodontic appliances, as opposed to adults who did not wear any orthodontic appliances. Thirty-six individuals participated in this study. Ninteen of these subjects did not wear any orthodontic appliances, and these subjects comprised the control group. The other 17 individuals had been wearing fixed orthodontic appliances for at least 3 months each. After a periodontal examination, we collected subgingival plaque samples from the gingivitis lesions of each patient. Using PCR based on 16S rDNA, we detected the presence of 6 putative periodontopathogenic species, Treponema denticola, Porphyromonas gingivalis, Tannerella forsythia (formerly Bacteroides forsythus), Prevotella nigrescens, Prevotella intermedia, and Actinobacillus actinomycetemcomitans. With regard to the presence of individual periodontopathogens, we found that T. forsythia, T. denticola, and P. nigrescens were significantly more common in the samples obtained from the orthodontic patients than in the samples obtained from the non-orthodontic patient controls. Our results indicate that the local changes associated with the wearing of fixed orthodontic appliances may affect the prevalence of periodontopathogens in subgingival dental plaques.

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