Dictionary » O » Opsonin



noun, plural: opsonins

Any substance (e.g. antibody) that binds to the surface of a particle (e.g. antigen) to enhance the uptake of the particle by a phagocyte (e.g. macrophage)


Opsonins are essential in immunological protection of the host against pathogenic bacteria. Opsonins in the surface of the antigen serve as "flags" to indicate that the antigen need to be destroyed by the action of the immune system.

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Confusion: Rod cells,rhodopsin bleaching

... cease to function. I understand that exposure to bright light bleaches all of the rhodopsin, but...so what? Why doesn't the bleached product (opsonin/retinal) simply get re-synthesised back into rhodopsin as it does in dim light, and therefore continue the cycle and enable impulses?

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by ADAS137
Sun Jan 01, 2012 10:26 pm
Forum: Human Biology
Topic: Confusion: Rod cells,rhodopsin bleaching
Replies: 0
Views: 1218

Opsonization...can someone give me an example?

Antigens are attached to the surface of the bacteria. like igG and C3b (i think) Opsonins (the molecules involved in opsonization) see here: http://en.wikipedia.org/wiki/Opsonin http://www.cat.cc.md.us/courses/bio141/lecguide/unit3/humoral/abydefense/opsonization/opsonization.html ...

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by Chris4
Mon Jul 04, 2005 4:24 pm
Forum: Cell Biology
Topic: Opsonization...can someone give me an example?
Replies: 2
Views: 3851

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