Biofilm bacterial slime

Bacterial biofilm: a matrix of exopolysaccharides that protects and organizes microbial communities on surfaces.

About this subject

A bacterial biofilm is a complex community of microorganisms encased in a matrix of extracellular polymeric substances (EPS), mainly polysaccharides, proteins, and DNA. This viscous layer, commonly called bacterial slime, adheres to biotic or abiotic surfaces such as teeth, catheters, and submerged rocks. Biofilm formation proceeds through stages: initial adhesion, colonization, maturation, and dispersal. Over 80% of chronic bacterial infections are estimated to involve biofilms, including dental caries and Pseudomonas aeruginosa infections in cystic fibrosis. In nature, biofilms play crucial ecological roles, such as bioremediation of pollutants and nutrient cycling in aquatic ecosystems. However, in industry, they cause biofouling on pipes and water systems, leading to significant economic losses. Antimicrobial resistance is a hallmark: biofilm cells can be up to 1000 times more tolerant to antibiotics than planktonic cells. Recent research focuses on strategies to inhibit biofilm formation or destabilize them, using enzymes, peptides, or modified surfaces. Understanding biofilm biology is essential to develop new treatments and antifouling materials.

Frequently Asked Questions

What is a bacterial biofilm?

It is a community of bacteria encased in a viscous polymer matrix that adheres to surfaces, providing protection and facilitating cell-to-cell communication.

Where are biofilms commonly found?

They occur in natural environments (rocks, rivers), in the human body (dental plaque, chronic infections), and on industrial surfaces (pipes, medical implants).

How do biofilms become resistant to antibiotics?

The EPS matrix hinders antibiotic penetration, and biofilm cells enter a low metabolic state, reducing drug efficacy.