Total internal reflection fluorescence (TIRF) microscopy was used to investigate initial attachment and stability of wild-type, curli-deficient (ΔcsgA), flagella-deficient (ΔflhDC), and type-1 fimbriae-deficient (Δfim) mutant E. coli strains. Suspended bacteria were injected into a flow cell where they deposited on a silica coverslip, and images were acquired over a 2 min period. TIRF microscope image analysis revealed that curli- and flagella-deficient mutants attached closer to the surface and required a longer time to find their equilibrium position (i.e., bond maturation) as compared to the wild-type and fimbriae-deficient mutants. Analysis of the change in bacterial surface area over the 2 min period also indicated that curli- and flagella-deficient mutants have less initial stability than the wild-type and fimbriae-deficient mutants, evidenced by their fluctuating position at equilibrium. TIRF observations at the microscopic level were complemented macroscopically using quartz crystal microbalance with dissipation (QCM-D) and sand-packed column experiments, which support the distinctive behavior observed at the microscopic scale. For each mutant strain, as fluorescence intensity increased in TIRF, the negative frequency shift in QCM-D (related to the attached mass of bacteria) also increased. Packed-column experiments indicated that curli- and flagella-deficient mutants exhibited a characteristically different attachment behavior and more retention as compared to the wild-type and fimbriae-deficient strains. This study utilized a new approach to understand bacterial attachment/detachment and provides new insights into the role of various appendages on initial attachment and stability.
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http://dx.doi.org/10.1021/acs.langmuir.7b00314 | DOI Listing |
Curr Opin Chem Biol
December 2024
Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA. Electronic address:
Enzymes catalyze molecular reactions with remarkable efficiency and selectivity under mild conditions. Photoactivated enzymes make use of a light-absorbing chromophore to drive chemical transformations, ideally using sunlight as an energy source. The direct attachment of a chromophore to native enzymes is advantageous, as information on the underlying catalytic mechanisms can be obtained.
View Article and Find Full Text PDFCureus
November 2024
Aerospace Engineering, Universiti Putra Malaysia, Kuala Lumpur, MYS.
Introduction Spinal fusion surgery with pedicle screws is commonly performed to stabilize the spine of osteoporotic patients. However, securing a strong screw fixation in osteoporotic bone presents significant challenges due to the reduced bone density. This study aimed to compare the biomechanical performance in an osteoporotic bone model of pedicle screws inserted using two different techniques, the Jamshidi needle technique and the pedicle probe technique, as well as the influence of tapping on both these techniques.
View Article and Find Full Text PDFFront Fungal Biol
December 2024
Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, United States.
is a globally significant genus of plant pathogens known for causing anthracnose across a diverse array of hosts. Notably, is a pathogen affecting maize. Annually, the global economic impact of this pathogen reaches billions of US dollars.
View Article and Find Full Text PDFJ Morphol
January 2025
Department of Invertebrate Zoology, Saint Petersburg State University, Saint Petersburg, Russian Federation.
The colonial system of integration (CSI) provides intracolonial nutrient supply in many gymnolaemate bryozoans. In Ctenostomata, its presence is known for species with stolonal colonies, for example, vesicularioideans, but its structure is almost unexplored. The CSI is thought to be absent in alcyonidioideans and other ctenostomes.
View Article and Find Full Text PDFJ Gastroenterol
December 2024
Department of Gastroenterological Endoscopy, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan.
Background: Despite accumulating evidence and recommendations for management of colonic diverticular bleeding (CDB), the changes in its clinical management and outcomes remain unknown.
Methods: We performed a retrospective tendency analysis on a biennial basis, a propensity score-matched cohort study between the first and latter half groups, and mediation analyses to compare the diagnostic and treatment methods between January 2010 and December 2019 (CODE BLUE-J Study).
Results: A total of 6575 patients with CDB were included.
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