Diffusion Time Measurement
Diffusion Time Measurement - Related Videos
07:00
Measuring Diffusion Coefficients via Two-photon Fluorescence Recovery After Photobleaching
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Cited by 4 •
2010
In this article we will describe the procedure for measuring diffusion coefficients using multi-photon fluorescence recovery after photobleaching. We will begin by aligning the laser along the optical path to the sample and determining the proper experimental parameters, then continue generating and finally fitting fluorescence recovery curves.
08:18
Diffusion and Osmosis - Student Protocol
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2019
Diffusion in Agar ExpandNOTE: In this exercise, you will be given agar containing an indicator chemical called phenolphthalein. When phenolphthalein is exposed to the normal alkaline conditions in the agar, it will look pink. But when it is exposed to neutral or acidic conditions, it changes from pink to clear. You will make different size and shaped agar cubes as a model for cells to study the impact of cell size and shape on diffusion rate. To make the first set of cells, measure out and cut...
02:55
Diffusion and Osmosis - Instructor Prep
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2019
Preparation of Solutions for the Agar Cube Experiment ExpandIMPORTANT: Wear gloves, goggles, and appropriate personal protective equipment – chemicals can be hazardous at high concentrations. For the diffusion indicator solution, weigh out 1 g of phenolphthalein and add it to a beaker containing 100 mL of 95% ethanol. To make the basic solution for the agar, measure 80 mL of water into a beaker, and then add 0.4 g of NaOH. Stir until the solute is dissolved then bring the total volume of the...
03:31
Diffusion and Osmosis - Concepts
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2019
Cell Membranes and Diffusion In order to function, cells are required to move materials in and out of their cytoplasm via their cell membranes. These membranes are semipermeable, meaning that certain molecules are allowed to pass through, but not others. This movement of molecules is mediated by the phospholipid bilayer and its embedded proteins, some of which act as transport channels for molecules that otherwise would not be able to pass through the membrane, such as ions and carbohydrates.
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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Cited by 2 •
2015
We present a new technique to measure the lateral diffusion of a surface active species at the fluid-fluid interface by merging a droplet monolayer onto a flat monolayer.
FAQs
The distance traveled is a major determinant of measured diffusion time. Under Fick’s laws, time rises approximately with distance squared, so doubling the travel distance can produce a much larger time requirement than a simple twofold increase. This relationship lets investigators characterize transport across biological spaces and assess whether observed movement is consistent with diffusion-based expectations.
Temperature, molecular size, and medium viscosity all influence the time required for movement. Changes in these conditions can alter the diffusion coefficient, the parameter that links random molecular motion with transport rate. Measuring time under defined conditions therefore helps compare mobility across biological media and identify whether slower movement may reflect the molecular or physical environment.
Confinement, molecular binding, and structural barriers can make observed movement differ from the expectation for unrestricted diffusion. These factors may prolong transport or alter apparent mobility within cells and other biological settings. Comparing measured times with diffusion-based predictions can therefore reveal effects of intracellular organization rather than treating every delay as a change in distance alone.
By analyzing the time course of fluorescence recovery, investigators can infer how molecular mobility changes within biological systems. The approach helps reveal transport behavior that may be influenced by confinement, binding, or cellular structure. It is therefore relevant to studies of membrane transport, signaling-related movement, and the organization of molecules inside cells.
Particle tracking provides a movement-based view of molecular mobility that complements fluorescence recovery measurements. Following particle motion can help identify how confinement, binding, or structural barriers affect transport in biological settings. This perspective is especially useful when intracellular organization produces varied movement behavior rather than a single mobility pattern for the entire system.
Researchers can apply diffusion time measurements to membrane transport, cellular signaling, metabolite movement, and intracellular organization. The resulting timing and mobility information helps characterize how molecules move through biological environments and how structural or molecular constraints modify that movement. These applications connect transport measurements with the organization and function of living biological systems.