Journal of Microbiology

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

Ruminococcus faecis sp. nov., Isolated from Human Faeces: Min-Soo Kim , Seong Woon Roh , Jin-Woo Bae; J. Microbiol. 2011;49(3):487-491. Published online June 30, 2011; DOI: https://doi.org/10.1007/s12275-011-0505-7

Abstract: Bacterial strain Eg2T, an anaerobic, Gram-positive, non-motile, and non-spore-forming coccus, was isolated from human faeces. The optimal temperature for its growth was 37°C. Oxidase activity was negative, but catalase activity was positive. The strain was able to hydrolyze esculin and to produce acids from the fermentation of several substrates, including glucose. Lactic and acetic acids were the main products of glucose fermentation. The major fatty acids present in this strain were C16:0, C14:0, and C18:1 cis11 DMA. The G+C content was 43.4 mol%. Based on the 16S rRNA gene sequence, strain Eg2T was closely related to species of the genus Ruminococcus (96.3% similarity to R. torques and 96.2% similarity to R. lactaris), and its taxonomic position was placed within the Clostridium cluster XIVa. Based on phenotypic, chemotaxonomic, genotypic, and phylogenetic evidence, we propose that this novel strain be assigned to the genus Ruminococcus and be named Ruminococcus faecis sp. nov. The type strain is Eg2T (=KCTC 5757T =JCM 15917T).

A Culture-Based Study of the Bacterial Communities within the Guts of Nine Longicorn Beetle Species and their Exo-enzyme Producing Properties for Degrading Xylan and Pectin: Doo-Sang Park , Hyun-Woo Oh , Won-Jin Jeong , Hyangmi Kim , Ho-Yong Park , Kyung Sook Bae; J. Microbiol. 2007;45(5):394-401.; DOI: https://doi.org/2598 [pii]

Abstract: In this study, bacterial communities within the guts of several longicorn beetles were investigated by a culture-dependent method. A total of 142 bacterial strains were isolated from nine species of longicorn beetle, including adults and larvae. A comparison of their partial 16S rRNA gene sequences showed that most of the bacteria constituting the gut communities can typically be found in soil, plants and the intestines of animals, and approximately 10% were proposed as unreported. Phylogenetic analysis demonstrated that the bacterial species comprised 7 phyla, and approximately half were Gammaproteobacteria. Actinobacteria were the second most populous group (19%), followed by Firmicutes (13%) and Alphaproteobacteria (11%). Betaproteobacteria, Flavobacteria, and Acidobacteria were minor constituents. The taxonomic compositions of the isolates were variable according to the species of longicorn beetle. Particularly, an abundance of Actinobacteria existed in Moechotypa diphysis and Mesosa hirsute, which eat broadleaf trees; however, no Actinobacteria were isolated from Corymbia rubra and Monochamus alternatus, which are needle-leaf eaters. Considerable proportions of xylanase and pectinase producing bacteria in the guts of the longicorn beetles implied that the bacteria may play an important role in the digestion of woody diets. Actinobacteria and Gammaproteobacteria were the dominant xylanase producers in the guts of the beetles.

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