Re: Fixative Osmolarity/Osmoality
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From: | Karen S Pawlowski <kna101@utdallas.edu> (by way of histonet) |
To: | histonet@histosearch.com |
Reply-To: | |
Date: | Mon, 31 Jan 2000 22:47:20 -0500 |
Content-Type: | text/plain; charset="us-ascii" |
Joyce,
It could be your glycol methacrylate procedure. I work on ears in JB-4
and I infiltrate the tissue over a full week, starting with 1 change in
50% ethanol, then 4 changes each in 70%, 95%, and 100% over 3 days or
more, then 3 changes in JB-4 without catalyst, with 2 of the 3 changes
going overnight. I used to do it faster and the tissue definitely looked
worse - the major components looked fine, but the fine structure of the
tissue, including nerve endings and other small delicate cells looked
damaged.
Since you said the paraffins look fine, I don't think it's your fix.
Hope this helps,
Karen Pawlowski
On Thu, 28 Oct 1999, Joyce Christopher wrote:
> Our laboratory has become interested in how to adjust the
> osmolarity/osmoality of fixatives. We conduct neurotoxicity studies
> with rodents. The animals are currently perfused with the 10% buffered
> formalin after a flush with sodium nitrite. We have recently identified
> vacuoles in the peripheral nerves (sciatic, tibial, sural and spinal
> nerve roots) which are embedded in glycol methacrylate. We do not see
> this artifact in the tissues embedded in paraffin. Some of our
> pathologists believe this is due to the high osmalitity found in our
> purchased fixative. We understand that the recommended range is 400-600
> mOsm.
>
> Does anyone have experience with adjusting the osmoality of fixatives?
> Are there references that may help us to better understand this and how
> to make the adjustments? Is this artifact possibly caused by something
> else? If you can provide some answer to these questions please contact
> me.
>
> Joyce Christopher
> Bayer Corporation
> 913-433-5244
> joyce.christopher.b@bayer.com
>
>
>
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