Related Experiment Video
Updated: May 10, 2026
13:28
Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry
Published on: February 15, 2012
[Biofilm score: is it a differential element within gram negative bacilli?]
Javier Gómez1, María Luisa Gómez-Lus, Pedro Bas
1Departamento de Medicina, Área de Microbiología, Facultad de Medicina UCM, Madrid, Spain.
Summary
Most Gram-negative bacteria strains studied did not form biofilms. A new technique standardized biofilm quantification, aiding clinical practice for treating infections caused by these bacteria.
Area of Science:
- Microbiology
- Bacteriology
Context:
- Biofilm formation in Gram-negative bacteria is a significant clinical concern.
- Quantifying biofilm production is crucial for understanding pathogenicity and treatment.
Purpose:
- To investigate and quantify biofilm formation in Gram-negative bacteria using a novel, standardized technique.
- To compare biofilm production across different Gram-negative species.
Summary:
- 153 Gram-negative strains from 12 species were analyzed using a modified optic density method.
- Standardization of results allowed for homogenization and reliable comparison.
- Over 63% of strains (105/153) were found to be non-biofilm developers.
Impact:
- Standardized quantification of biofilm development can aid clinical practice.
- Identifying non-biofilm-forming strains may influence treatment strategies for Gram-negative infections.
Related Concept Videos
01:26Differential Staining Technique
Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...
01:29Biofilms
Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
01:22Bacterial Cell Wall
The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
01:26Bacterial Phylum Proteobacteria
Proteobacteria, one of the largest and most diverse bacterial phyla, encompasses a wide range of Gram-negative bacteria distinguished by their outer membrane composed of lipopolysaccharides. These microorganisms exhibit various metabolic capabilities, including phototrophy, chemolithotrophy, and heterotrophy, and thrive in diverse environments from soil to aquatic systems and host-associated niches. The phylum is divided into six classes: Alphaproteobacteria, Betaproteobacteria,...
01:29Cytoskeletal Proteins in Bacteria
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
01:30Bacterial Phylum Actinobacteria
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...