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Related Concept Videos

Diffusion01:12

Diffusion

221.8K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
221.8K
Diffusion01:21

Diffusion

6.5K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
6.5K
Facilitated Diffusion01:16

Facilitated Diffusion

1.3K
The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
1.3K
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

31.4K
Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
31.4K
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

5.7K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

1.7K
Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Related Experiment Video

Updated: Feb 11, 2026

Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
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Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy

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Bilateral Diffuse and Cluster Pigment Epithelial Detachment Associated with Diffuse Proliferative Glomerulonephritis.

Heshmatollah Ghanbari1, Alireza Dehghani1, Mohsen Pourazizi1

  • 1Isfahan Eye Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.

Case Reports in Ophthalmological Medicine
|April 21, 2018
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Summary

Bilateral cluster Retinal pigment epithelium detachment (PED) in a young male was linked to diffuse proliferative glomerulonephritis (DPGN). This case highlights the importance of regular eye exams for DPGN patients to detect potential vision complications.

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Area of Science:

  • Ophthalmology
  • Nephrology
  • Systemic Diseases

Background:

  • Retinal pigment epithelium detachment (PED) involves sub-RPE fluid accumulation.
  • PED can be idiopathic or associated with various conditions.
  • Diffuse proliferative glomerulonephritis (DPGN) is a severe kidney disease.

Observation:

  • A 23-year-old male presented with bilateral cluster PED.
  • The PED was associated with diagnosed DPGN.
  • This association suggests a potential link beyond mere coincidence.

Findings:

  • The case demonstrates a co-occurrence of PED and DPGN in a young patient.
  • This finding underscores the systemic implications of DPGN.
  • Sub-RPE fluid accumulation can be a manifestation of systemic disease.

Implications:

  • Patients diagnosed with DPGN require regular ophthalmological monitoring.
  • Ophthalmologists should be vigilant for PED in patients with DPGN.
  • Early detection and management of PED may prevent vision loss in DPGN patients.