Project description:Transcriptome analysis to determine the impact of oral exposure (in a sugar meal) to the liquid supernatant (i.e. LB culture media) of Chromobacterium sp. Panama biofilm culture. The biofilm supernatant (i.e. media) was first filtered with a 0.2uM filter to remove all live bacterial cells. It was then mixed with 10% sucrose, and a control sucrose meal was mixed with filtered LB. Mosquitoes were exposed to each sugar meal for 24 hours and then midguts were dissected from 20 adult females per treatment. The entire experiment was performed 4 independent times.
Project description:The objective of this study was to analyze the mitochondrial mutations induced by chronic cigarette smoke extract treatment in human oral immortal OKF6 cells. The objective of this study was to analyze the mitochondrial mutations induced by chronic cigarette smoke extract treatment in human oral immortal OKF6 cells.
Project description:To combat dental implant-associated infections, there is a need for novel materials which effectively inhibit bacterial biofilm formation. In the present study, a titanium surface functionalization based on the “slippery liquid-infused porous surfaces” (SLIPS) principle was analyzed in an oral flow chamber system. The immobilized liquid layer was stable over 13 days of continuous flow. With increasing flow rates, the surface exhibited a significant reduction in attached biofilm of both the oral initial colonizer Streptococcus oralis and an oral multi-species biofilm composed of S. oralis, Actinomyces naeslundii, Veillonella dispar and Porphyromonas gingivalis. Using single cell force spectroscopy, reduced bacterial adhesion forces on the lubricant layer could be measured. Gene expression patterns in biofilms on SLIPS, on control surfaces and planktonic cultures were also compared. For this purpose, the genome of S. oralis strain ATCC® 9811TM was sequenced using PacBio Sequel technology. Even though biofilm cells showed clear changes in gene expression compared to planktonic cells, no differences could be detected between bacteria on SLIPS and on control surfaces. Therefore, it can be concluded that the ability of liquid-infused titanium to repel biofilms is solely due to weakened bacterial adhesion to the underlying liquid interface.
