biofilm


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Related to biofilm: Quorum sensing

Biofilm

An adhesive substance, the glycocalyx, and the bacterial community which it envelops at the interface of a liquid and a surface. When a liquid is in contact with an inert surface, any bacteria within the liquid are attracted to the surface and adhere to it. In this process the bacteria produce the glycocalyx. The bacterial inhabitants within this microenvironment benefit as the biofilm concentrates nutrients from the liquid phase. However, these activities may damage the surface, impair its efficiency, or develop within the biofilm a pathogenic community that may damage the associated environment. Microbial fouling or biofouling are the terms applied to these actual or potentially undesirable consequences.

Microbial fouling affects a large variety of surfaces under various conditions. Microbial biofilms may form wherever bacteria can survive; familiar examples are dental plaque and tooth decay. Dental plaque is an accumulation of bacteria, mainly streptococci, from saliva. The process of tooth decay begins with the bacteria colonizing fissures in and contact points between the teeth. Dietary sucrose is utilized by the bacteria to form extracellular glucans that make up the glycocalyx and assist adhesion to the tooth. Within this microbial biofilm or plaque the metabolic by-products of the bacterial inhabitants are trapped; these include acids that destroy the tooth enamel, dentin, or cementum.

biofilm

[′bī·ō‚film]
(microbiology)
A microbial (bacterial, fungal, algal) community, enveloped by the extracellular biopolymer which these microbial cells produce, that adheres to the interface of a liquid and a surface.
References in periodicals archive ?
A few studies have applied computational fluid dynamics (CFD) simulations to describe flow pattern in MTPs during biofilm production and optimised the suitable conditions to detect the biofilm formation which have proven to be efficient.12-14 It is suggested that higher flow rates increase the nutrient availability, promote cell growth, and attachment pattern with increased production of exopolymer, while the increase in flow velocity increases the shear rate, causing erosion and disassembly of biofilm production because of detachment from the surface.15
After testing the robots on biofilms growing on either a flat glass surface or enclosed glass tubes, the researchers tried out a more clinically relevant application: Removing biofilm from hard-to-reach parts of a human tooth.
(8) demonstrated that sub-MICs of rifampin could induce biofilm formation by Staphylococcus epidermidis.
According to a new research published in Water Resources Research, Yongqiu Xia, an Associate Professor in the Institute of Soil Sciences, Chinese Academy of Sciences, along with his team revealed the secret between periphytic Biofilm and denitrification process.
Prior to experimental use, cells were washed with fresh TSB and adjusted to an optical density of 0.7 (550 nm) for adhesion experiments (2x[10.sup.8] cells/mL) and of 0.4 (550 nm) for biofilm experiments ([10.sup.8] cells/mL).
Biofilm infections are a growing health concern in their own right.
Considering the studies about the role of biofilm formation in nasopharyngeal infections, we designed this cross-sectional study to evaluate the association between the extent of biofilm on the adenoid surface in children who had respiratory obstructive symptoms with the frequency of upper respiratory infections in the 12-month period before admission, using a scanning electron microscope (SEM).
The rationale of our study was to explicate bacterial etiologies, illuminate biofilm-associated resistivity patterns, and to endorse suitable antimicrobial therapy against biofilm producers in CAUTIs.