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Concept
Phototrophic biofilm
Summary
Phototrophic biofilms are microbial communities generally comprising both phototrophic microorganisms, which use light as their energy source, and chemoheterotrophs. Thick laminated multilayered phototrophic biofilms are usually referred to as microbial mats or phototrophic mats (see also biofilm). These organisms, which can be prokaryotic or eukaryotic organisms like bacteria, cyanobacteria, fungi, and microalgae, make up diverse microbial communities that are affixed in a mucous matrix, or film. These biofilms occur on contact surfaces in a range of terrestrial and aquatic environments. The formation of biofilms is a complex process and is dependent upon the availability of light as well as the relationships between the microorganisms. Biofilms serve a variety of roles in aquatic, terrestrial, and extreme environments; these roles include functions which are both beneficial and detrimental to the environment. In addition to these natural roles, phototrophic biofilms have also been adapted for applications such as crop production and protection, bioremediation, and wastewater treatment.
Biofilm formation is a complicated process which occurs in four general steps: attachment of cells, formation of the colony, maturation, and cell dispersal. These films can grow in sizes ranging from microns to centimeters in thickness. Most are green and/or brown, but can be more colorful.
Biofilm development is dependent on the generation of extracellular polymeric substances (EPS) by microorganisms. The EPS, which is akin to a gel, is a matrix which provides structure for the biofilm and is essential for growth and functionality. It consists of organic compounds such as polysaccharides, proteins, and glycolipids and may also include inorganic substances like silt and silica. EPS join cells together in the biofilm and transmits light to organisms in the lower zone. Additionally, EPS serves as an adhesive for surface attachment and facilitates digestion of nutrients by extracellular enzymes.
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