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thermophilus LMD-9 and 4F44. These results demonstrate that S. thermophilus strains possessing prtS are prevalent in Japan and that some prtS-positive strains could lose their fast acidifying properties through mutations in PrtS.Lactobacillus fermentum MTCC 25067 produces a hetero-exopolysaccharide (HePS) when cultured which forms supramolecular networks in the culture medium, increasing the viscosity. In the present study, the viscosity of the bacterial culture reached its maximum at 48 hr of cultivation and then decreased during a stationary growth phase lasting for up to 144 hr. The monosaccharide composition did not change during the stationary growth phase, whereas degradation of HePS molecules was noticeable, leading to partial disintegration of their supramolecular networks. The viscosity values of the HePS purified from the culture and dissolved in a fresh medium indicated little contribution of medium components to the viscosity. Absence of the apparent network structure of the HePS in the surrounding area of bacterial cells was observed during the late growth phase, supporting the idea that the decreases in culture viscosity during the prolonged period of cultivation were caused mainly by reduced interactions between bacterial cells and the intact supramolecular networks as a consequence of decreasing bacterial cell wall integrity and partial degradation of HePS molecules.Sourdough, a traditional fermented dough, is made via natural fermentation by lactic acid bacteria (LAB). Its pH changes from near neutral to acid during the subculture process. However, the product quality of subcultured sourdough depends on the unpredictable succession of LAB communities, the influential factors of which are still unclear. To elucidate one end of the LAB community succession mechanism, we evaluated the effect of pH by designing four subculture experiments using a model medium adjusted to pH 6.7, 5.5, and 4.5, as well as a natural sourdough subculture. All experiments began by inoculating a sourdough LAB mixture, and both bacterial successions and fermentative properties were monitored until ten subculture steps. In media subcultures, lactic acid production was higher in higher pH media. Three LAB genera, Weissella, Pediococcus, and Lactobacillus, each represented by one operational taxonomic unit (OTU), were successively detected in all subcultures. In later steps with lower pH media, an OTU closely related to Lactobacillus brevis dominated, replacing an OTU closely related to the Weissella cibaria-confusa group that was more dominant than the L. brevis OTU in the near-neutral pH medium. In the sourdough subculture, the three genera were also detected, while Lactobacillus was dominant in earlier steps due to the emergence of an OTU closely related to Lactobacillus sanfranciscensis. These results suggest that a lower pH is favorable for the sequence of sourdough bacterial community evolution finalizing with Lactobacillus domination. Further research is needed to elucidate additional factors other than pH that influence the pattern of LAB community shift.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. https://www.selleckchem.com/products/geneticin-g418-sulfate.html 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.Certain strains of lactic acid bacteria (LAB) have beneficial effects on Japanese cedar pollinosis (JCPsis), which is a major concern in Japan. Heat-killed Lactobacillus plantarum YIT 0132 (LP0132), selected for its ability to induce interleukin (IL)-10, has been shown to suppress JCPsis symptoms. Lactobacillus casei Shirota (LcS), a popular probiotic, potentially induces a high level of IL-12 and is reported to delay the onset of JCPsis symptoms. However, it is unclear whether a combination of different types of LAB exerts additional effects without interfering with the benefits of each individual LAB. Thus, we conducted a pilot study to investigate the effects of LP0132-fermented citrus juice on JCPsis during simultaneous consumption of LcS-fermented milk. Fifty-nine subjects with JCPsis were allocated to two groups after a 2-week preconsumption period one group consumed LP0132-fermented citrus juice and LcS-fermented milk (LcS+LP0132 group) for 12 weeks, while the other consumed LcS-fermented milk alone (LcS group). JCPsis symptoms, JCPsis-associated quality of life (QOL) impairment, and bowel movements were assessed by questionnaires. Compared with the LcS group, the LcS+LP0132 group showed significant alleviation of total symptoms and total ocular symptoms during the consumption period, as well as relief of impaired QOL. Bowel movements were significantly improved during the consumption period compared with the baseline in a combined analysis of all subjects in the two groups. In conclusion, LP0132-fermented citrus juice appears to have positive effects on some JCPsis symptoms and QOL in a population consuming immunomodulating probiotics such as LcS-fermented milk.The fraction of administered antibiotics that reach the cecum and colon causes dysbiosis of the gut microbiome, resulting in various diseases. Protection of the gut microbiome from antibiotics using antibiotic adsorbents in the cecum and colon is a promising method to overcome this issue. Previously, activated charcoal (AC) has been reported to protect the gut microbiome of host animals. AC is an adsorbent that is widely used to capture toxic compounds and overdosed drugs in the gastrointestinal tract. The specificity of adsorbents for antibiotics is critical to avoid the risk of unexpected side effects caused by nonspecific adsorption of biological compounds in the intestinal fluid, such as bile acids and essential micronutrients. Here, we have developed specific adsorbents for vancomycin (VCM), which is known to cause gut dysbiosis. The adsorbents were composed of polyethyleneglycol-based microparticles (MPs) in which a specific ligand for VCM, D-Ala-D-Ala-OH, was attached via dendrons of D-lysine to raise the content of the ligand in the MPs.
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