Osmotic Lysis
Osmotic Lysis - Related Videos
02:40
Osmosis and Osmotic Pressure of Solutions
0 Views •
2020
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
03:12
A Procedure for Bacterial Harvesting and Mechanical Lysis
0 Views •
2025
Source: Mercier, N., et al. MS2-Affinity Purification Coupled with RNA Sequencing in Gram-Positive Bacteria. J. Vis. Exp. (2021)This video demonstrates a step-by-step procedure for harvesting bacterial cells and mechanically lysing them to release intracellular contents.
01:26
Osmotic Pressure
0 Views •
2026
Osmosis is a process where solvent molecules move toward a solution through a semipermeable membrane. As the solution dilutes due to the entry of solvent, it expands. This expansion increases the hydrostatic pressure of the solution. When the hydrostatic pressure equals the osmotic pressure, osmosis stops.Osmotic pressure, denoted by Π, is the minimum pressure needed to prevent the solvent from passing into the solution by osmosis. The van 't Hoff equation calculates the osmotic pressure of an...
02:48
Examine Chemoavoidance Behavior in Transgenic Worms Using Osmotic Avoidance Assay
0 Views •
2025
This video describes an osmotic avoidance assay to examine chemoavoidance behavior in a transgenic worm model. Avoidance behavior is tested in a plate in the presence of a high-osmotic barrier and chemoattractant. The worms with a functional loss of neurons get attracted by the chemoattractant, cross the high-osmotic barrier, and become paralyzed in the trap zone because of the anesthetic solution.
02:24
Osmotic Pump-Based Neurotherapeutic Drug Delivery in a Demyelinated Mouse Model
0 Views •
2025
Source: Wang, X. et. al., Osmotic Pump-based Drug-delivery for In Vivo Remyelination Research on the Central Nervous System. J. Vis. Exp. (2021)This video demonstrates the method for delivering neurotherapeutic drugs using an osmotic pump in a demyelinated mouse model. The controlled drug release promotes remyelination by activating myelin-producing cells in the corpus callosum.
FAQs
Whether swelling ends in rupture depends on the balance between water entry and the membrane’s ability to accommodate the increasing volume. As water enters, internal expansion raises membrane tension. Once that tension exceeds what the plasma membrane can tolerate, integrity is lost and intracellular material can escape. Thus, lysis reflects both osmotic driving force and structural tolerance.
A hypotonic solution has fewer dissolved solutes outside the cell than inside the cytoplasm. That difference establishes the osmotic imbalance that drives water across the plasma membrane. The resulting influx is not merely a change in volume: it creates the swelling and membrane stress that determine whether a susceptible cell remains intact or undergoes lysis.
The outcome depends on cellular susceptibility, not simply on placing any cell in a dilute environment. Red blood cells are a common target, while other cells may also be disrupted if their membranes cannot accommodate the swelling produced by osmotic water entry. Recognizing this difference helps researchers select cells for intracellular-content release or avoid unintended membrane rupture.
Cells are placed in a hypotonic surrounding fluid so osmotic water entry produces swelling and, for susceptible cells, rupture. The resulting disruption releases intracellular contents. Investigators can then use that released material for biochemical analysis or proceed toward cell fractionation, making the osmotic treatment a preparation step rather than the final measurement.
The released intracellular contents can serve as starting material for biochemical analysis or cell fractionation. Osmotic disruption therefore links a physical change in membrane integrity to downstream sample preparation. Its practical value lies in making internal cellular material accessible for investigations that require analysis of what was contained inside the cell.
Beyond laboratory sample preparation, osmotic lysis illustrates how cells respond to changing environments. A shift toward a hypotonic external fluid creates a solute imbalance across the plasma membrane, and water entry can progressively challenge membrane integrity. Studying this sequence connects osmotic conditions with the maintenance of cellular boundaries and the transition from intact membranes to rupture.