RE: soil aggregates
Good Morning Fred,
Your internet searching capabilities are astounding. I thank you extremely
much for all the sites you sent. This should keep the dirt people happy
for a long time. While I enjoy challenges, this one was just a tad out of
my realm. The critter eyes are piling up and I must get back to the safety
of paraffin :)
At 02:35 PM 7/25/2002 -0400, you wrote:
> You sound like one who has been working this area, but you are
>asking a question that I would consider elementary for a material complex
>such as soil. Thus, I did my usual and instituted a search to see what I
>could find, because I am likely to see similar questions within the near
>For me, a real beginner, I think I will spend time here, and then start
>conversing with the experts whose methods are cited.
> From what I see, most of what workers in dirt consider "thin sectioning"
>involves grinding and/or sawing. When I first had to work with a truly hard
>substance, I immediately found myself in the domain of the material
>scientist. Geologists don't ordinarily consider cutting a thin section as
>we do, they think of grinding one - just like the ground bone sections that
>one finds in almost all elementary histology slide sets.
>Aggregates of micro-size particles can be mounted and ground, if they are on
>the macro- side of micro-. If smaller, and it is paramount that the
>aggregates NOT be disturbed, then I would turn, as rapidly as possible, to
>more esoteric methods such as ion or plasma etching which can be used on
>embedded material and can, apparently be very productive.
>Here are a couple sites that might help to present the degree to which
>technology using electron optics and focused ion beams or plasmas are used
>in both analysis and production.
> http://www.mmc.or.jp/std/5.htm [this is a gas!]
> Finally, Ion Beam Milling at,
>Hope this helps,
>Frederick C. Monson, PhD
>Center for Advanced Scientific Imaging
>Schmucker II Science Center
>West Chester University
>South Church Street and Rosedale
>West Chester, Pennsylvania, USA, 19383
>CASI URL: http://darwin.wcupa.edu/casi/
>WCUPA URL: http://www.wcupa.edu/
>Visitors URL: http://www.wcupa.edu/_visitors/
> > ----------
> > From: MaryLou
> > Sent: Wednesday, July 24, 2002 12:31 PM
> > To: email@example.com
> > Cc: dawit Solomon
> > Subject: soil aggregates
> > Dear Histonetters,
> > A colleague is wanting to see inside soil aggregates of varying
> > thicknesses, up to several hundred microns. I was able to make paraffin
> > sections, 20 microns, by soaking the samples in paraffin for many
> > hours. No solvents allowed. A researcher at NASA gets 1 micron sections
> > from his dust particles in sulfur. We have no idea how he does it.
> > Thinner is better. Any suggestions out there? Do any bone grinders have
> > any
> > ideas? Do you know of anybody else we can ask?
> > Please include Dawit in your responses. Dawit, do you have anything to
> > add?
> > Thank you very much.
> > Mary Lou
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