Related Experiment Video
Updated: Aug 11, 2026
05:45
Measuring the Bending Stiffness of Bacterial Cells Using an Optical Trap
Published on: April 26, 2010
Mechanical resonances of bacteria cells
P V Zinin1, J S Allen, V M Levin
1Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
Summary
This study models bacterial natural vibrations using a shell model, predicting high-quality resonances for bacteria larger than 5 micrometers. Viscous shear waves are key to energy dissipation, with implications for acoustic bacterial destruction.
Area of Science:
- Biophysics
- Acoustics
- Microbiology
Background:
- Understanding bacterial mechanics is crucial for developing novel treatment strategies.
- Previous studies have explored oscillations in red blood cells, drops, and bubbles, highlighting viscous dissipation.
Purpose of the Study:
- To investigate the natural vibrations of bacteria using a theoretical shell model.
- To predict bacterial resonances and understand energy dissipation mechanisms.
- To explore implications for acoustic-mediated bacterial destruction.
Main Methods:
- A shell model was developed, incorporating elastic membrane properties and cytoplasmic/fluid viscosities.
- Bacterial membrane motion was approximated using internal force distribution.
- Experimentally obtained membrane properties were used for predictions.
Main Results:
- High-quality resonances were predicted for bacteria with radii greater than 5 micrometers.
- Viscous shear waves were identified as the primary source of energy dissipation.
- The model successfully predicted resonant frequencies based on bacterial size and material properties.
Conclusions:
- The shell model provides a valuable framework for understanding bacterial acoustics.
- Bacterial size and membrane properties significantly influence natural vibration frequencies.
- Acoustic methods show potential for targeted bacterial destruction based on resonant properties.
Related Concept Videos
01:30Bacterial Signaling
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
01:58Mechanical Protein Functions
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
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...
01:29Coordination of Gene Expression Processes in Bacteria
The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
01:18Flagella and Motility in Bacteria
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
01:28Prokaryotic Cells
Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.