Hello all
Returned here after a number of years away. Exchanged shells here quite a
few times much earlier. Some may remember me. My collection comes mainly
from the Med and UK.
Rather surprised at the reaction I received when I attempted to sell sea
shells on ebay.
I have recently been given a very tatty Cowrie (cypraea spurca) which was
found in an ancient amphora from a wreck which sunk in 300BC. Obviously the
cowrie fell into the amphora sometime after the sinking and the
deterioration of the liquids inside. The shell is clogged with sand. Is
there anyway to determine the age of this shell via modern scientific means?
Probably involve too much cost for my mean pocket :-)
Best wishes.
Eddie Clamp
West Sussex, UK
-----Original Message-----
From: CONCH-L automatic digest system
Sent: Wednesday, February 27, 2019 5:00 AM
To: [log in to unmask]
Subject: CONCH-L Digest - 26 Feb 2019 (#2019-41)
There are 4 messages totaling 932 lines in this issue.
Topics of the day:
1. Removal of specimens from SEM stubs (3)
2. Unknown Locality
----------------------------------------------------------------------
Date: Tue, 26 Feb 2019 19:09:44 +0000
From: JOHN A CRAMER <[log in to unmask]>
Subject: Re: Removal of specimens from SEM stubs
Ah, don't have one but I can see the potential resolution problems.
Emeritus Professor of PhysicsOglethorpe University, Atlanta, GAebooks at
https://www.smashwords.com/books/search?query=John+Cramerpaperback books at
https://www.lulu.com/shop/search.ep?keyWords=john+a.+cramer&type=&pn=2
On Tuesday, February 26, 2019, 1:46:51 PM EST, Callomon,Paul
<[log in to unmask]> wrote:
These days most SEMs are “environmental” SEMs that don’t require metal
coating. We only do it if we want really high resolution or the specimen
just doesn’t conduct well.
Paul Callomon
Collection Manager, Malacology and General Invertebrates
Academy of Natural Sciences of Drexel University, Philadelphia
1900 Benjamin Franklin Parkway, Philadelphia PA 19103-1195, USA
[log in to unmask] Tel 215-405-5096 - Fax 215-299-1170
From: Conchologists List <[log in to unmask]> On Behalf Of JOHN A
CRAMER
Sent: Tuesday, February 26, 2019 1:28 PM
To: [log in to unmask]
Subject: Re: [CONCH-L] Removal of specimens from SEM stubs
Following this thread I'm a bit puzzled. Don't you gold sputter the
specimens to get the pictures? Then the specimens are damaged to start
with.
Emeritus Professor of Physics
Oglethorpe University, Atlanta, GA
ebooks at
https://www.smashwords.com/books/search?query=John+Cramer
paperback books at
https://www.lulu.com/shop/search.ep?keyWords=john+a.+cramer&type=&pn=2
On Tuesday, February 26, 2019, 8:58:52 AM EST, Phyllis Sharp
<[log in to unmask]> wrote:
Does anyone have a foolproof way to remove specimens from the adhesive tape
on the desktop SEM stub after imaging? Many of the micros we're imaging are
fragile and challenging to remove without damage.
Thanks,ter the specimens?
Phyllis
Phyllis Sharp
Denver Museum of Nature and Science
Zoology Departmental Associate
Marine Invertebrate Collections
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------------------------------
Date: Tue, 26 Feb 2019 14:00:31 -0800
From: Jann Vendetti <[log in to unmask]>
Subject: Re: Removal of specimens from SEM stubs
Hello all,
We use an "old school" and magnificent SEM that requires sputter coating at
the museum (NHMLA). If something is small and can be adhesive (a radula, or
piece of tissue), we mount it on a piece of glass that is stuck to regular
SEM carbon tabs/adhesive. A little water and a gentle nudge with fine
forceps (or a dog whisker) will usually dislodge the sputter coated
specimen and let us re-position it or remove it. *Geiger et al. (2007)
state that 95%+ ethanol can remove a specimen from a carbon conductive
tab/adhesive. *They discuss this and other techniques on page. 21of
"Techniques for collecting, handling, ..." (
https://www.researchgate.net/publication/288605135_Techniques_for_collecting_handling_preparing_storing_and_examining_small_molluscan_specimens
)
Very best wishes,
Jann
____________________________________________
Jann E. Vendetti, Ph.D.
Assistant Curator & Twila Bratcher Chair in Malacology
*Natural History Museum of Los Angeles County*
900 Exposition Blvd., Los Angeles, CA 90007
Phone: 213-763-3380
Email: [log in to unmask]
iNaturalist: http://www.inaturalist.org/projects/slime
Donate: https://nhm.wedid.it/campaigns/6123
she/her/hers
On Tue, Feb 26, 2019 at 8:30 AM Harry Lee <[log in to unmask]> wrote:
> Dear Phyllis,
>
> No method is foolproof for this task.
>
> Experience has led me to retain my thousands of fossil micromollusk shell
> specimens on their stubs after imaging and curate them in that undisturbed
> repose.
>
> Many species of fossil microbivalves, e.g., Galeommatoidea, in particular
> are extremely brittle. My imperfect manual dexterity with an artist's
> brush
> combined with a variety of solvents (water may be as good as any) put
> these
> and others at significant risk of severe mutilation.
>
> Harry
>
>
> On 2/26/2019 8:57 AM, Phyllis Sharp wrote:
>
> Does anyone have a foolproof way to remove specimens from the adhesive
> tape on the desktop SEM stub after imaging? Many of the micros we're
> imaging are fragile and challenging to remove without damage.
>
> Thanks,
> Phyllis
>
> Phyllis Sharp
> Denver Museum of Nature and Science
> Zoology Departmental Associate
> Marine Invertebrate Collections
> ----------------------------------------------------------------------
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> address and name in the appropriate box and click leave the list.
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>
>
> ----------------------------------------------------------------------
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------------------------------
Date: Tue, 26 Feb 2019 22:24:36 +0000
From: John Varner <[log in to unmask]>
Subject: Re: Removal of specimens from SEM stubs
Just a sidebar to this thread: Acupuncture needles are available in
diameters as small as .12mm (44 gauge). They are surgical stainless,
literally thinner than a dog whisker. I have provided a few to a friend who
was manipulating the spicules of glass sponges for em imaging.
John
Sent from john's iPhone
On Feb 26, 2019, at 5:00 PM, Jann Vendetti
<[log in to unmask]<mailto:[log in to unmask]>> wrote:
Hello all,
We use an "old school" and magnificent SEM that requires sputter coating at
the museum (NHMLA). If something is small and can be adhesive (a radula, or
piece of tissue), we mount it on a piece of glass that is stuck to regular
SEM carbon tabs/adhesive. A little water and a gentle nudge with fine
forceps (or a dog whisker) will usually dislodge the sputter coated specimen
and let us re-position it or remove it. Geiger et al. (2007) state that 95%+
ethanol can remove a specimen from a carbon conductive tab/adhesive. They
discuss this and other techniques on page. 21of "Techniques for collecting,
handling, ..."
(https://www.researchgate.net/publication/288605135_Techniques_for_collecting_handling_preparing_storing_and_examining_small_molluscan_specimens)
Very best wishes,
Jann
____________________________________________
Jann E. Vendetti, Ph.D.
Assistant Curator & Twila Bratcher Chair in Malacology
Natural History Museum of Los Angeles County
900 Exposition Blvd., Los Angeles, CA 90007
Phone: 213-763-3380
Email: [log in to unmask]<mailto:[log in to unmask]>
iNaturalist: http://www.inaturalist.org/projects/slime
Donate: https://nhm.wedid.it/campaigns/6123
she/her/hers
On Tue, Feb 26, 2019 at 8:30 AM Harry Lee
<[log in to unmask]<mailto:[log in to unmask]>> wrote:
Dear Phyllis,
No method is foolproof for this task.
Experience has led me to retain my thousands of fossil micromollusk shell
specimens on their stubs after imaging and curate them in that undisturbed
repose.
Many species of fossil microbivalves, e.g., Galeommatoidea, in particular
are extremely brittle. My imperfect manual dexterity with an artist's brush
combined with a variety of solvents (water may be as good as any) put these
and others at significant risk of severe mutilation.
Harry
On 2/26/2019 8:57 AM, Phyllis Sharp wrote:
Does anyone have a foolproof way to remove specimens from the adhesive tape
on the desktop SEM stub after imaging? Many of the micros we're imaging are
fragile and challenging to remove without damage.
Thanks,
Phyllis
Phyllis Sharp
Denver Museum of Nature and Science
Zoology Departmental Associate
Marine Invertebrate Collections
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---------------------------------
------------------------------
Date: Tue, 26 Feb 2019 17:01:24 -0600
From: Cecil Bankston <[log in to unmask]>
Subject: Unknown Locality
I have a Cypraea scurra with the locality "Bengosi, East Africa" on its
label. I can't find Bengosi in geographic databases. Can anyone
suggest what the actual name of the locality might be?
--
Cecil Bankston
Baton Rouge, LA
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End of CONCH-L Digest - 26 Feb 2019 (#2019-41)
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