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Colonisation microbial surface

The ability of the stone-colonizing microflora to cover and even penetrate material surface layers by the excretion of organic extracellular polymeric substances (EPS) leads to the formation of complex slimes, or biofilms, in which the microbial cells are embedded. Phototrophic organisms usually initiate colonisation by establishing a visible, nutrient-rich biofilm on new stone from which they can penetrate the material below to seek protection from high light intensities or desiccation. Stone EPS trap aerosols, dust and nutrients, minerals,... [Pg.226]

Abiotic hydrolysis, photo-oxidation and physical disintegration of polymers may enhance the biodegradation rate of polymers by increasing their surface contact area for microbial colonisation or by reducing the molecular weight [113]. In the case of lactic acid homo- and heteropolymers, abiotic hydrolysis is the most important reaction for initiating the environmental degradation... [Pg.771]

If a microbial cell is introduced into a pharmaceutical preparation or onto a surface it will sense whether suitable conditions (nutrients, moisture, etc.) for growth are available (interaction with the environment). If possible the cell will adapt to its new habitat, and start to metabolise the available nutrients. Eventually growth will take place. Motility of individual cells will facilitate colonisation of other sites. Production of toxins (in case of a pathogen) is a demanding... [Pg.384]

Upon degradation, oligomers and monomers of PHA are produced, which are then assimilated by the microorganisms as nutrients. Electron microscopy analysis of PHA films revealed that degradation occurs at the surface via enzymatic hydrolysis. The degradation is therefore a function of the surface area available for microbial colonisation. [Pg.242]

Phase 3 The second step of microbial succession, it normally follows Phase 2 where the pH has been reduced fairly. Another species of SOB known as acidophilic sulphur-oxidising bacteria (ASOM) such as T. thiooxidans colonise the concrete surface and further reduce the acidity. It has been proposed that during Phase 2 the NSOM reduces the pH to 4.0 where during Phase 3, the pH is further reduced by the ASOM to 1.0 or 2.0 [28]. [Pg.128]

Contrary to popular belief, the physical fragmentation of hydrocarbon polymers can be accelerated in a controlled manner by heat and light by the use of appropriate combinations of additives [2]. This results from peroxidation and chemical modification of the component polymers and is associated with the formation of low molecular weight carboxylic acids and alcohols. This encourages microbial colonisation at the surface of the plastic and leads to bioerosion of the film with mass loss. [Pg.222]


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See also in sourсe #XX -- [ Pg.246 ]




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