- 著者
- Chie Tsutsumi Ayako Maeda Atsushi Abe Yumi Yamashita Tomohisa Yukawa Satoshi Kakishima
- 出版者
- National Museum of Nature and Sciece (National Science Museum, Tokyo)
- 雑誌
- 国立科学博物館研究報告B類(植物学) (ISSN:18819060)
- 巻号頁・発行日
- vol.47, no.3, pp.131-141, 2021-08-20 (Released:2021-08-31)
- 参考文献数
- 24
The taxonomy of Japanese Oberonia, particularly O. makinoi, has been confusing. Molecular analyses of Japanese Oberonia, including plants called “O. makinoi,” were performed. Phylogenetic trees deduced from the nuclear internal transcribed spacer (ITS) region, the plastid matK with trnK introns, and single-nucleotide polymorphisms (SNPs) data derived from MIG-seq show that “O. makinoi” collected from Shikoku and Kyushu is distinctive from the other species of Oberonia. The plants called “O. makinoi” differ from O. japonica in the leaf size and the flowering season. Furthermore, samples from the Ryukyus (Okinawa and Amami Islands) appear conspecific with, or closely related to “O. makinoi.” The taxonomic treatment of Japanese Oberonia requires further analyses using samples collected from central Japan and comparison to congeners in neighboring areas, particularly in Taiwan, where similar species are distributed.
- 著者
- Yutaka MAKIZAKI Ayako MAEDA Miyuki YAMAMOTO Saya TAMURA Yoshiki TANAKA Shunji NAKAJIMA Hiroshi OHNO
- 出版者
- BMFH Press
- 雑誌
- Bioscience of Microbiota, Food and Health (ISSN:21863342)
- 巻号頁・発行日
- vol.39, no.3, pp.145-151, 2020 (Released:2020-07-28)
- 参考文献数
- 25
- 被引用文献数
- 3 7
Recent studies of metformin, the first-line drug for type 2 diabetes, have reported the involvement of gut microbiota in the mechanism underlying its antihyperglycemic effect. However, the mechanisms underlying the development of diarrhea and bloating, which are adverse effects of metformin, are unclear, and these effects decrease the quality of life of metformin-receiving patients with diabetes. In this study, we focused on the effects of metformin on gut microbiota. Namely, we examined the effects of Bifidobacterium bifidum G9-1 (BBG9-1), which has the ability to improve dysbiosis, on the changes in gut microbiota and occurrence of soft feces (increased fecal water content) during the administration of metformin. The results showed that coadministration of BBG9-1 and metformin suppressed metformin-mediated changes in the gut microbiota and, thus, soft feces. Meanwhile, BBG9-1 did not influence the antihyperglycemic effect of metformin. Based on these results, we believe that BBG9-1, which could improve gut microbiota, suppresses metformin-induced soft feces without influencing the drug’s antihyperglycemic effect.