Journal of Microbiology

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Core gut microbiota in Jinhua pigs and its correlation with strain, farm and weaning age: Hua Yang , Yingping Xiao , Junjun Wang , Yun Xiang , Yujie Gong , Xueting Wen , Defa Li; J. Microbiol. 2018;56(5):346-355. Published online May 2, 2018; DOI: https://doi.org/10.1007/s12275-018-7486-8

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Gut microbial diversity and the core microbiota of the Jinhua pig, which is a traditional, slow-growing Chinese breed with a high body-fat content, were examined from a total of 105 fecal samples collected from 6 groups of pigs at 3 weaning ages that originated from 2 strains and were raised on 3 different pig farms. The bacterial community was analyzed following high-throughput pyrosequencing of 16S rRNA genes, and the fecal concentrations of short-chain fatty acids (SCFAs) were measured by gas chromatograph. Our results showed that Firmicutes and Bacteroidetes were the dominant phyla, and Lactobacillus, Streptococcus, Clostridium, SMB53, and Bifidobacterium were the most abundant genera. Fifteen predominant genera present in every Jinhua pig sample constituted a phylogenetic core microbiota and included the probiotics Lactobacillus and Bifidobacterium, and the SCFAproducing bacteria Clostridium, Prevotella, Bacteroides, Coprococcus, Roseburia, Ruminococcus, Blautia, and Butyricicoccus. Comparisons of the microbiota compositions and SCFA concentrations across the 6 groups of pigs demonstrated that genetic background and weaning age affected the structure of the gut microbiota more significantly than the farm. The relative abundance of the core genera in the pigs, including Lactobacillus, Clostridium, Prevotella, Bacteroides, Roseburia, Ruminococcus, Blautia, and Butyricicoccus varied dramatically in pigs among the 2 origins and 3 weaning ages, while Oscillospira, Megasphaera, Parabacteroides, and Corynebacterium differed among pigs from different farms. Interestingly, there was a more significant influence of strain and weaning age than of rearing farm on the SCFA concentrations. Therefore, strain and weaning age appear to be the more important factors shaping the intestinal microbiome of pigs.

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Nocardioides suum sp. nov. isolated from the air environment in an indoor pig farm: Siwon Lee , Wonseok Lee , Hyen-Mi Chung , Sangjung Park; J. Microbiol. 2017;55(6):417-420. Published online April 20, 2017; DOI: https://doi.org/10.1007/s12275-017-6313-y

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Abstract

A bacterial strain PBT33-2T was isolated from the air environ-ment in an indoor pig farm. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain PBT33-2T be-longed to the genus Nocardioides in the phylum Actinobac-teria, and was most closely related to Nocardioides daphnia D287T in a maximum-likelihood and neighbor-joining phy-logenetic trees. Strain PBT33-2T shared 95.3% sequence iden-tity with N. daphnia D287T. However, the highest sequence similarity was shown with N. sediminis MSL-01T (96.0%). It had less than 96.0% sequence identities with other type spe-cies of the genus Nocardioides. Strain PBT-33-2T grew at 15–45°C (optimum 20–35°C), pH 5.0–11.0 (optimum pH 7.0) and 0–4.0% (w/v) NaCl (optimum 0%). The major fatty acid and quinone were iso-C16:0 and MK-8, and the DNA G+C content of strain PBT33-2T was 69.3 mol%. On the basis of poly-phasic results, strain PBT33-2T represents a novel spe-cies of the genus Nocardioides, for which the name Nocar-dioides suum sp. nov. is proposed. Its type strain is PBT33-2T (=KCTC 39558T =DSM 102833T).

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Nocardioides cremeus sp. nov., Nocardioides abyssi sp. nov. and Nocardioides oceani sp. nov., three actinobacteria isolated from Western Pacific Ocean sediment
Wenjing Wang, Yihan Ding, Shiping Wei, Miaomiao Yin, Gaiyun Zhang
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Nocardioides humilatus sp. nov., isolated from farmland soil in the Republic of Korea
Jong Min Lee, Chun-Zhi Jin, Min-Kyoung Kang, So Hee Park, Dong-Jin Park, Dong-Gyun Kim, Chang-Jin Kim
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Description of Nocardioides piscis sp. nov., Sphingomonas piscis sp. nov. and Sphingomonas sinipercae sp. nov., isolated from the intestine of fish species Odontobutis interrupta (Korean spotted sleeper) and Siniperca scherzeri (leopard mandarin fish)
Dong-Wook Hyun, Yun-Seok Jeong, Jae-Yun Lee, Hojun Sung, So-Yeon Lee, Jee-Won Choi, Hyun Sik Kim, Pil Soo Kim, Jin-Woo Bae
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Nocardioides euryhalodurans sp. nov., Nocardioides seonyuensis sp. nov. and Nocardioides eburneiflavus sp. nov., isolated from soil
Su Gwon Roh, Chan Lee, Min-Kyeong Kim, Hye-Jeong Kang, Yeong Seok Kim, Min Ji Kim, Adeel Malik, Seung Bum Kim
International Journal of Systematic and Evolutionary Microbiology .2020; 70(4): 2682. CrossRef
Nocardioides speluncae sp. nov., a novel actinobacterium isolated from a karstic subterranean environment sample
Bao-Zhu Fang, Ming-Xian Han, Jian-Yu Jiao, Xiao-Tong Zhang, Yuan-Guo Xie, Wael N. Hozzein, Dalal Hussien M. Alkhalifah, Min Xiao, Wen-Jun Li
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Cyclobacterium sediminis sp. nov. isolated from a sea cucumber aquaculture farm and emended description of the genus Cyclobacterium: Seyeon Shin , Hyung-Yeel Kahng; J. Microbiol. 2017;55(2):90-95. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6484-6

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Abstract

An aerobic, Gram-negative bacterium, designated strain SD70T, was isolated from sea cucumber aquaculture farm sediment in Taean, Korea, and its taxonomic status was established by undertaking a polyphasic study. Cells of strain SD70T were non-motile, catalase-, and oxidase-positive, nonspore- forming, and horseshoe-shaped. Optimal growth was observed under 25–30°C, pH 7.0–8.0, and 3.0–5.0% (w/v) NaCl conditions. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain SD70T fell within an evolutionary group comprising species of the genus Cyclobacterium. Strain SD70T shared 92.1–98.5% 16S rRNA sequence similarity values with the type strains of species of the genus Cyclobacterium. Relatively low levels of DNA-DNA relatedness were found between strain SD70T and C. marinum DSM 745T (40.2%) and C. amurskyense KMM 6143T (15.8%). The predominant cellular fatty acids were iso-C15:0 (32.1%), and anteiso-C15:0 (9.1%). Menaquinone MK-7 was the only respiratory quinone. The G+C content of the genomic DNA was 36 mol%. The polar lipids were phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, and seven unidentified lipids. On the basis of phenotypic and genotypic data, strain SD70T represents a novel species of the genus Cyclobacterium, for which the name Cyclobacterium sediminis sp. nov. is proposed. An emended description of the genus Cyclobacterium is also provided.

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

Bacillus cheonanensis sp. nov. Isolated from Near Poultry Farm Soil: Hyun-Ju Kim , Cheol-Su Park , Siwon Lee , Tae-Young Ahn; J. Microbiol. 2014;52(7):554-558. Published online May 30, 2014; DOI: https://doi.org/10.1007/s12275-014-3458-9

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Abstract

A novel bacterial strain, designated PFS-5T, was isolated from the soil environment with feces of a live poultry farm located in Cheonan, Republic of Korea. Strain PFS-5T was Gram-staining-positive, motile, strictly aerobic bacterium, rod-shaped, and endospore-forming. The strain contained meso-diaminopimelic acid in their peptidoglycan and MK-7 menaquinone. The major fatty acids were anteiso-C15:0 (44.2%), C16:0 (22.2%), and iso-C15:0 (16.7%). The DNA G+C content was 40.1 mol%. Comparative 16S rRNA gene sequence analysis identified strain PFS-5T in the genus Bacillus, exhibiting the highest level of sequence similarity with type strain of B. herbersteinensis D-1,5aT (96.9%), B. humi LMG 22167T (96.7%), B. alkalitelluris BA288T (96.1%), B. litoralis SW-211T (96.0%), and B. luteolus YIM93174T (95.5%). The major polar lipids of PFS-5T were diphosphatidylglycerol and phosphatidylglycerol. On the basis of result from poly-phasic data, strain PFS-5T represents a novel species, for which the name Bacillus cheonanensis sp. nov. is proposed (Type strain PFS-5T= KACC 17469T= JCM19333T).

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Bacillus coreaensis sp. nov.: a xylan-hydrolyzing bacterium isolated from the soil of Jeju Island, Republic of Korea
Won-Jae Chi, Young Sang Youn, Jae-Seon Park, Soon-Kwang Hong
Journal of Microbiology.2015; 53(7): 448. CrossRef

Genetic Diversity and Population Structure of Escherichia coli from Neighboring Small-Scale Dairy Farms: Jesús Andrei Rosales-Castillo , Ma. Soledad Vázquez-Garcidueñas , Hugo Álvarez-Hernández , Omar Chassin-Noria , Alba Irene Varela-Murillo , María Guadalupe Zavala-Páramo , Horacio Cano-Camacho , Gerardo Vázquez-Marrufo; J. Microbiol. 2011;49(5):693-702. Published online November 9, 2011; DOI: https://doi.org/10.1007/s12275-011-0461-2

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Abstract: The genetic diversity and population structure of Escherichia coli isolates from small-scale dairy farms were used to assess the ability of E. coli to spread within the farm environment and between neighboring farms. A total of 164 E. coli isolates were obtained from bovine feces, bedding, cow teats and milk from 6 small-scale dairy farms. Ward’s clustering grouped the isolates into 54 different random amplified polymorphic DNA (RAPD) types at 95% similarity, regardless of either the sample type or the farm of isolation. This suggests that RAPD types are shared between bovine feces, bedding, cow teats, and milk. In addition, transmission of RAPD types between the studied farms was suggested by the Ward grouping pattern of the isolates, Nei’s and AMOVA population analyses, and genetic landscape shape analysis. For the first time, the latter analytical tool was used to assess the ability of E. coli to disseminate between small-scale dairy farms within the same producing region. Although a number of dispersal mechanisms could exist between farms, the genetic landscape shape analysis associated the flow of E. coli RAPD types with the movement of forage and milking staff between farms. This study will aid in planning disease prevention strategies and optimizing husbandry practices.

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