glutaraldehyde fixation and biotin

Dr. Dennis Goode GOODE at ZOOL.UMD.EDU
Tue Nov 1 12:01:36 EST 1994

Glutaraldehyde doesn't block the binding of most gold-labeled probes, 
but I don't know about the biotin-streptavidin system. I'd try it 
1st at the light microscope level on a monolayer of whole cells. After 
GAL fixation, reduce w NaBH4, and stain w fluorescein-labeled avidin 
or use your gold-labeled avidin and then silver enhance to visualize.
One way to visualize gold-labeled molecules (with or wo silver 
enhancement) at higher resolution is to freeze dry the gold-labeled 
monolayer, coat w aluminum, and examine in a scanning EM with a 
backscatter detector (See Goode & Maugel J. E. M. Techniques 5: 263-

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