BIOS 3210 Lecture Notes - Lecture 8: Extracellular Polymeric Substance, Autoinducer, Aliivibrio Fischeri
16 Aug 2016
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At high intensities generates singlet oxygen o2 a. i. 1. Microbial growth in natural environments: microbial natural environments are complex a. i. Often contain low nutrient concentrations (oligotrophic environment) a. iii. Microbes have to adapt accordingly: microbes may have to endure periods without nutrients b. i. Enter a dormant metabolically inactive state b. ii. 1. b. ii. 2. Biofilms: microbes can grow free floating in liquid (planktonic, can also grow attached to surfaces in communities called biofilms, biofilms are ubiquitous in nature in water, can be formed on any surface especially conditioned surfaces. Biofilms continued: biofilms are complex, dynamic communities of microorganisms, consist of bacteria and extracellular polymeric substances (eps) that holds the bacteria together, biofilm matrix c. i. Dna: are not uniform, bacteria in different places in the biofilm are exposed to different environmental conditions, heterogeneity results in differences in metabolic activity of microbes, may be more than one species in the biofilm. Vi: biofilm bacteria are extremely difficult to kill a. i.
