Journal of Microbiology

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

An Aqueous Extract of Yunnan Baiyao Inhibits the Quorum-Sensing-Related Virulence of Pseudomonas aeruginosa: Zu-Guo Zhao , Shuang-Shuang Yan , Yun-Mei Yu , Na Mi , La-Xi Zhang , Jun Liu , Xiao-Ling Li , Fang Liu , Jun-Fa Xu , Wei-Qing Yang , Guo-Ming Li; J. Microbiol. 2013;51(2):207-212. Published online April 27, 2013; DOI: https://doi.org/10.1007/s12275-013-2595-x

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Yunnan Baiyao is a famous Chinese medicine that has long been directly applied to wounds to reduce bleeding, pain, and swelling without causing infection. However, little is known about its ability to prevent infection. The present study aimed to assess in vitro the anti-virulence activity of an aqueous extract of Yunnan Baiyao (YBX) using Pseudomonas aeruginosa as a pathogenic model. We found that a sub-MIC (2.5 mg/ml) of YBX can efficiently interfere with the quorum-sensing (QS) signaling circuit. Real-time polymerase chain reaction analysis showed that a sub-MIC of YBX downregulated the transcriptions of lasR, lasI, rhlR, and rhlI, which resulted in global attenuation of QS-regulated virulence activities, such as biofilm formation, and secretion of LasA protease, LasB elastase and pyocyanin. Further, YBX reduced the motility of P. aeruginosa related to QS, and impaired the formation of biofilms. These results suggest that YBX may possess global inhibitory activity against the virulence of P. aeruginosa and that YBX may also exhibit antimicrobial activity in vivo. The present study suggests that Yunnan Baiyao represents a potential source for isolating novel, safe, and efficacious antimicrobial agents.

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Highland Macrolichen Flora of Northwestern Yunnan, China: Jae-Seoun Hur , Li-Song Wang , Soon-Ok Oh , Gyoung Hee Kim , Kwang-Mi Lim , Jae-Sung Jung , Young Jin Koh; J. Microbiol. 2005;43(3):228-236.; DOI: https://doi.org/2222 [pii]

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Abstract PDF: Fifty-six species in 36 genera of macrolichens are reported from the Zhongdian area, northwest Yunnan, China during the lichenological expedition for highland macrolichen survey in June, 2004. More than 60% of these species have not been reported in South Korea. All of the 182 collected specimens are deposited in the Korean Lichen Research Institute (KoLRI) at Sunchon National University in Korea, and some of them are duplicated in the lichen herbarium, Crytogamic Herbarium, Kunming Institute of Botany, Academia Sinica (KUN-L) in China. This is the first report on the macrolichen flora in the visited areas.

Introductory Journal Article

[Editorial]Omics-based microbiome analysis in microbial ecology: from sequences to information: Jang-Cheon Cho; J. Microbiol. 2021;59(3):229-232.; DOI: https://doi.org/10.1007/s12275-021-0698-3

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Abstract PDF

Microbial ecology is the study of microorganisms present in nature. It particularly focuses on microbial interactions with any biota and with surrounding environments. Microbial ecology is entering its golden age with innovative multi-omics
methods
triggered by next-generation sequencing technologies. However, the extraction of ecologically relevant information from ever-increasing omics data remains one of the most challenging tasks in microbial ecology. This special issue includes 11 review articles that provide an overview of the state of the art of omics-based approaches in the field of microbial ecology, with particular emphasis on the interpretation of omics data, environmental pollution tracking, interactions in microbiomes, and viral ecology.

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