Biofilm Basics

Description

Medical Microbiology (Biofilms) Flashcards on Biofilm Basics, created by gina_evans0312 on 17/04/2014.
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Flashcards by gina_evans0312, updated more than 1 year ago
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Created by gina_evans0312 over 10 years ago
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Resource summary

Question Answer
Biolfilm Definition A community of organisms bound to a surface- can be single or mixed species- that allows colonisation of modern environments
EPS Extracellular Polymeric Substances, which bind the bacteria in a biofilm together
Control of Biofilm Formation Environmentally controlled, i.e the availability of nutrients
Biofilm Formation- Planktonic Cells The planktonic cells are the first to bind to the surface in biofilm formation
Biofilm Formation- Division Planktonic cells then divide to form mushroom like structures
Biofilm Formation- Division Control Controlled by various methods- environment, quorum sensing
Biofilm Formation- Cell Detachment Cells on the edge of the biofilm can divide and return to the planktonic state
Biofilm Formation- Cell Detachment Control Can be internal (Chemical signalling) or external (flow rate)
Heterogenous Biofilms- Bacterial Species I.e S.epidermidus
Heterogenous Biofilms- AnBis as a Cause Cells on the edge produce DNA and die if AnBis are used, but AnBis cannot penetrate to inner cells
Heterogenous Biofilms- O2 as a Cause Environment- i.e. Excess O2 on edge, no O2 in the middle (effecting product)
Heterogenous Biofilms- Product as a Cause Inner cells are surr. by a greater conc of product than outer cells (this can be used by other species in the biofilm)
Heterogenous Biofilms- Other possible Causes (Other) There can be many- pressure, nutrient availability, flow rate, etc.
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