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Related Concept Videos

Diffusion01:12

Diffusion

217.9K
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...
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Diffusion01:21

Diffusion

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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...
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Facilitated Diffusion01:16

Facilitated Diffusion

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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...
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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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

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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...
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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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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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Methods for Acute and Subacute Murine Hindlimb Ischemia
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Methods for Acute and Subacute Murine Hindlimb Ischemia

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Diffuse unilateral subacute neuroretinitis.

Pratyusha Ganne1, Pankaja Dhoble1

  • 1Department of Retina, Aravind Eye Hospital, Puducherry, India.

Oman Journal of Ophthalmology
|February 22, 2019
PubMed
Summary
This summary is machine-generated.

Diffuse unilateral subacute neuroretinitis (DUSN) is an outer retinal inflammation caused by a subretinal worm. Optical coherence tomography (OCT) successfully identified the worm, enabling targeted laser treatment.

Keywords:
Diffuse unilateral subacute neuroretinitislaseroptical coherence tomography

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Area of Science:

  • Ophthalmology
  • Infectious diseases
  • Parasitology

Background:

  • Diffuse unilateral subacute neuroretinitis (DUSN) is an inflammatory condition affecting the outer retina.
  • It is typically caused by a subretinal nematode, though identification is challenging.
  • Current treatment involves identifying and destroying the worm via laser photocoagulation.

Observation:

  • A case of DUSN presented with a subretinal worm located in the macula.
  • Optical coherence tomography (OCT) provided clear visualization of the worm within the subretinal space.
  • The worm's presence was confirmed through advanced imaging techniques.

Findings:

  • The subretinal worm was successfully identified using OCT scans.
  • Laser photocoagulation was employed as the primary treatment modality.
  • Successful treatment outcomes were achieved post-intervention.

Implications:

  • OCT imaging is a valuable tool for diagnosing DUSN when the worm is not directly visible.
  • Early and accurate diagnosis through OCT can lead to timely and effective laser treatment.
  • This case highlights the importance of advanced imaging in managing rare parasitic retinal infections.