MMG 301 Lecture Notes - Lecture 25: Motility, Cyanobacteria, Biochemical Oxygen Demand
3 Apr 2017
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Document Summary
Factors such as nutrients, antagonism by other organisms, ph, temperature, and other conditions in a microenvironment: know the biotic and abiotic factors that affect microbial growth. Abiotic: water availability, nutrient/oxygen availability, and temperature. Biotic: nutrient exchange/syntrophy, antagonism, competition, predation, and parasitism: understand how nutrient availability affects microbial growth rates. In nature, nutrient limitation, non-ideal conditions, and slow growth are the norm: know how microbes benefit by living in biofilms. Protection from predators, better nutrient availability, and physical protection from changing environmental conditions: be able to describe the process of biofilm development and what microbial mats are. Attachment (adhesion of a few motile cells to a suitable surface), colonization (intercellular communication, growth, and polysaccharide formation), development (more growth and polysaccharides), active dispersal (triggered by environmental factors such as nutrient availability) Microbial mats are biofilms that form multiple layered communities: describe how biofilms from a bacterial pathogen affects patients with cystic fibrosis.
