Hydroxyapatite showed better remineralization when compared to CPP-ACP and Tri-calcium phosphate.
Background Bifidobacteria are commensal microbes of the mammalian gastrointestinal tract. In this study, we aimed to identify the intestinal colonization mechanisms and key metabolic pathways implemented by Bifidobacterium dentium. Results B. dentium displayed acid resistance, with high viability over a pH range from 4 to 7; findings that correlated to the expression of Na+/H+ antiporters within the B. dentium genome. B. dentium was found to adhere to human MUC2+ mucus and harbor mucin-binding proteins. Using microbial phenotyping microarrays and fully-defined media, we demonstrated that in the absence of glucose, B. dentium could metabolize a variety of nutrient sources. Many of these nutrient sources were plant-based, suggesting that B. dentium can consume dietary substances. In contrast to other bifidobacteria, B. dentium was largely unable to grow on compounds found in human mucus; a finding that was supported by its glycosyl hydrolase (GH) profile. Of the proteins identified in B. dentium by proteomic analysis, a large cohort of proteins were associated with diverse metabolic pathways, indicating metabolic plasticity which supports colonization of the dynamic gastrointestinal environment. Conclusions Taken together, we conclude that B. dentium is well adapted for commensalism in the gastrointestinal tract.
Background: Bacteroidetes are the most common bacterial phylum in the mammalian intestine and the effects of several Bacteroides spp. on multiple facets of host physiology have been previously described. Of the Bacteroides spp., Bacteroides ovatus has recently garnered attention due to its beneficial effects in the context of intestinal inflammation. In this study, we aimed to examine model host intestinal physiological conditions and dietary modifications to characterize their effects on B. ovatus growth.Methods and Results: Using Biolog phenotypic microarrays, we evaluated 62 primary carbon sources and determined that B. ovatus ATCC 8384 can use the following carbohydrates as primary carbon sources: 10 disaccharides, 4 trisaccharides, 4 polysaccharides, 4 polymers, 3 L-linked sugars, 6 D-linked sugars, 5 amino-sugars, 6 alcohol sugars, and 15 organic acids. Proteomic profiling of B. ovatus bacteria revealed that a significant portion of the B. ovatus proteome contains proteins important for metabolism. Among the proteins, we found glycosyl hydrolase (GH) familes GH2, GH5, GH20, GH 43, GH88, GH92, and GH95. We also identified multiple proteins with antioxidant properties and reasoned that these proteins may support B. ovatus growth in the GI tract. Upon further testing, we showed that B. ovatus grew robustly in various pH, osmolarity, bile, ethanol, and H2O2 concentrations; indicating that B. ovatus is a well-adapted gut microbe.Conclusion: Taken together, we have demonstrated that key host and diet-derived changes in the intestinal environment influence B. ovatus growth. These data provide the framework for future work toward understanding how diet and lifestyle interventions may promote a beneficial environment for B. ovatus growth.
Background and Aims According to the World Health Organization (WHO), more than 75.7 million confirmed cases of coronavirus disease 2019 (COVID‐19), a global pandemic caused by severe acute respiratory syndrome coronavirus 2 ( SARS‐CoV‐2), have been reported so far. Researchers are working relentlessly to find effective solutions to this catastrophe, using genomic sequence‐based investigation, immunological analysis, and more. The role of health disparity has also emerged as an intriguing factor that made a huge impact on the lives of people. Methods We analyzed various factors that triggered the health disparity in the United States of America along with the rate of COVID‐19 morbidity and mortality. Furthermore, we have also focused on the State of Mississippi, which is suffering from an extreme health disparity. Data have been obtained from publicly available data sources including, Center for Disease Control and Prevention and Mississippi State Department of Health. Correlation analysis of the dataset has been performed using R software. Results Our analysis suggested that the COVID‐19 infection rate per 100 000 people is directly correlated with the increasing number of the African American population in the United States. We have found a strong correlation between the obesity and the COVID‐19 cases as well. All the counties in Mississippi demonstrate a strong correlation between a higher number of African American population to COVID‐19 cases and obesity. Our data also indicate that a higher number of African American populations are facing socioeconomic disadvantages, which enhance their chances of becoming vulnerable to pre‐existing ailments such as obesity, type‐2 diabetes, and cardiovascular diseases. Conclusion We proposed a possible explanation of increased COVID‐19 infectivity in the African American population in the United States. This work has highlighted the intriguing factors that increased the health disparity at the time of the COVID‐19 pandemic.
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