ml

Search


Resource Type
 Video (50)
 Image (454)
 Animation (135)
 Protocol (41)
Curriculum Archive (85)
Tags
 Cell Biology (253)
 Genetics (81)
Humans (372)
 Environment (274)
 Diversity (108)
 Teaching (367)
Banner

Outer Membranes of Neisseria sp. Send Print

  Votes (0) | Hits (3926) | Comments (0)
Created: Tuesday, 01 January 2002
Last update: Thursday, 19 August 2010
Author
View / Comment
Preview
Neisseria gonorrheae (Enlarged view)
View / Comment
Preview
Neisseria gonorrheae (Labeled view)
View / Comment
Preview
Neisseria cinnerea (Enlarged view)
View / Comment
Preview
Neisseria cinnerea (Labeled view)
View / Comment
Preview
Neisseria meningitidis (Enlarged view)
View / Comment
Preview
Neisseria meningitidis (Labeled view)
Information

The outer membranes of gram-negative bacteria are unique structures. This comparison of three gram-negative diplococci--Neisseria gonorrheae, N. cinnerea, and N. meningitidis--illustrates that outer membranes vary quite a bit from one organism to the next.  Characteristically, outer membranes appear heavily textured in electron microscopic views.  Here, the extent of the texture on the cell surface is shown to be slight on N. gonorrheae (Fig. 1), moderate on N. cinnerea (Fig. 2), and very extensive on N. meningitidis (Fig. 3). Other studies have indicated that much of the toxicity of N. meningitidis(causative agent of septicemia and meningitis) arises from its release of endotoxin in the form of membranous protrusions called blebs.  Here, the propensity of the N. meningitidis outer membrane to form blebs is obvious when directly compared with other membranes of the same genus.

Students may find these three electron micrographs interesting because of the diversity revealed about outer membrane structure, the connection indicated between virulence and ultrastructure, and the close-up views of the characteristic diplococcus morphology.

ShareIcon Share





Tags: Cell biology (255)