Biofilm bacterial slime

Bacterial biofilm is a structured community of microorganisms encased in a polymeric matrix, found in natural and industrial settings.

About this subject

Bacterial biofilms are clusters of microbial cells attached to surfaces and encased in an extracellular matrix, typically composed of polysaccharides, proteins, and DNA. This structure shields bacteria from antimicrobial agents, desiccation, and predators. Biofilms can form on virtually any moist surface: rocks in rivers, water pipes, medical implants, teeth (dental plaque), and even ship hulls (biofouling). Biofilm formation follows steps: initial adsorption, irreversible adhesion, maturation, and dispersal. In healthcare, biofilms are responsible for chronic infections, such as those associated with catheters and prosthetics, and are difficult to treat due to increased resistance. In industry, they can cause microbial corrosion and clogging of pipes, but are also useful in bioremediation and wastewater treatment. A curious fact is that biofilm is the predominant form of bacterial life in nature, with sessile cells representing most of the planet's microbial biomass. It is estimated that 80% of human bacterial infections are biofilm-related. The study of biofilms has advanced with confocal microscopy and molecular biology, enabling understanding of cell-cell communication (quorum sensing) and the role of the matrix.

Frequently Asked Questions

What is a bacterial biofilm?

A bacterial biofilm is a community of bacteria attached to a surface, encased in a self-produced gelatinous matrix. This matrix protects the bacteria and enables communication between them.

Where are biofilms found?

In virtually any moist environment: on teeth (plaque), in pipes, on rocks, on medical implants, on ship hulls, and even in water treatment systems.

Why are biofilms hard to treat?

Due to the protective matrix that prevents antibiotics and disinfectants from penetrating, as well as containing persister cells that can restart growth.