[Nhcoll-l] Coelacanth deterioration
Dirk Neumann
dirk.neumann at zsm.mwn.de
Thu Sep 21 15:50:22 EDT 2017
Hi Perry,
in case of calciferous sand it could have been to buffer the fluid
against low pH values, but gneiss is more or less chemically inert so I
would assume it has been added for cosmetic reason.
All the best
Dirk
Am 21.09.2017 um 21:42 schrieb Perry Poon:
>
> Hi Simon
>
> There is a fine sandy substrate on the bottom of the Coelacanth
> display. I remember that the movers had the Coelacanth in a container
> filled with alcohol, and the sand and alcohol were added to the glass
> display tank. The sand was allowed to settle before the Coelacanth
> was placed into the display tank. Some of the gneiss with mica that
> were floating tin the tank could easily settle on the coelacanth
> specimen. This would explain the small amount of glitter that I see on
> the Coelacanth.
>
> I was thinking of replacing the alcohol and disposing of the sand.
>
> Any thoughts on this? Is the sand just for cosmetic reasons?
>
> Cheers,
>
> *Perry Poon*
> Coordinator, Props
>
> Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>
> D 604 659 3489
>
> ------------------------------------------------------------------------
>
> Our vision is a world in which oceans
> are healthy and flourishing. | ocean.org
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> *From:*Simon Moore [mailto:couteaufin at btinternet.com]
> *Sent:* Thursday, September 14, 2017 1:13 AM
> *To:* Perry Poon <Perry.Poon at ocean.org>; John E Simmons
> <simmons.johne at gmail.com>; robert Waller <rw at protectheritage.com>
> *Cc:* nhcoll-l at mailman.yale.edu; Dirk Neumann <dirk.neumann at zsm.mwn.de>
> *Subject:* Re: [Nhcoll-l] Coelacanth deterioration
>
> Hi Perry,
>
> Glad (in a way!) that the turbidity test proved to be positive as it
> indicates that you have a large amount of lipid in solution as well as
> (probably) coating the specimen and this bears out the reason for the
> pH lowering.
>
> The glitter is odd. Have there been (or are there still) small pebbles
> in the display tank? Sometimes designers will add these to improve
> the appearance of the specimen and these often contain small bits of
> glitter, rather like gneiss with mica.
>
> The issue with the 5% formalin versus alcohol - I still stand by what
> I said although I should have added: provided that it is well
> maintained! Always a problem these days with thinner collection
> staffing levels.
>
> With all good wishes, Simon.
>
> Simon Moore MIScT, RSci, FLS, ACR
> Conservator of Natural Sciences and Cutlery Historian,
> www.natural-history-conservation.com
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.natural-2Dhistory-2Dconservation.com&d=DwIDaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=2vay4CLL5jRBFSezIdNGx-0PZDHlbl71Bu-MZOabJ_k&s=7ImsMkuWVzaDPiPMLp8KDe6vaPrKjPjujrvMm_B_jjQ&e= >
>
>
>
> On 14 Sep 2017, at 00:27, Perry Poon <Perry.Poon at ocean.org
> <mailto:Perry.Poon at ocean.org>> wrote:
>
> Hi Simon
>
> I did the turbidity test of the coelacanth display alcohol. I put
> a sample of the alcohol into a petri dish and the liquid became
> white and cloudy.
>
> I saw several small droplets of fat in the liquid and a thin film
> of fat that covered most of the petri dish on the liquid’s surface.
>
> I was told by a colleague that there are small pieces of glitter
> on the surface of the Coelacanth’s skin that are less than a
> millimeter in size. They are very minute, and I see them when the
> light hits them at a particular angle.
>
> Have you ever seen these ? What are these?
>
> Thank you for all your help and expertise.
>
> Cheers,
>
> *Perry Poon*
> COORDINATOR, PROPS
>
> Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>
> D 604 659 3489
>
> ------------------------------------------------------------------------
>
> Our vision is a world in which oceans
> are healthy and flourishing. |ocean.org <https://urldefense.proofpoint.com/v2/url?u=http-3A__ocean.org_&d=DwIDaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=2vay4CLL5jRBFSezIdNGx-0PZDHlbl71Bu-MZOabJ_k&s=ksAm55R-0WEfuHr__9-2yHcca33vFTYgIMLbwWoOIFg&e= >
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>
> *From:*Simon Moore [mailto:couteaufin at btinternet.com]
> *Sent:*Tuesday, September 12, 2017 3:27 PM
> *To:*Perry Poon <Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>>
> *Cc:*John E Simmons <simmons.johne at gmail.com
> <mailto:simmons.johne at gmail.com>>
> *Subject:*Re: [Nhcoll-l] Coelacanth deterioration
>
> Hi Perry,
>
> At pH 4 the skeleton and other calcium salt-containing areas start
> to decalcify - effectively removing the inorganic matrix. This
> leads to scale drop as well as weakening of the skeleton and
> eventual specimen collapse.
>
> Try a simple turbidity test as well. A Petri dish on a black
> background with some water init - pipette some of the alcohol from
> the specimen - is their any cloudiness or turbidity at all? If
> so, the this would represent saturation of lipid (normally from
> the liver) and which has likely oxidised forming fatty acids -
> lowering of pH. The scales looked rather orange too which would
> also suggest lipid saturation but that might have been due to
> photographic lighting?
>
> With all good wishes, Simon.
>
> Simon Moore MIScT, RSci, FLS, ACR
> Conservator of Natural Sciences and Cutlery Historian,
> www.natural-history-conservation.com
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.natural-2Dhistory-2Dconservation.com_&d=DwIDaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=2vay4CLL5jRBFSezIdNGx-0PZDHlbl71Bu-MZOabJ_k&s=XPdSEp9wq4zgsMdhkSyja9QzQxOpc9Ih5pQLAokoVfA&e= >
>
>
>
>
> On 12 Sep 2017, at 20:09, Perry Poon <Perry.Poon at ocean.org
> <mailto:Perry.Poon at ocean.org>> wrote:
>
> Hi Simon Moore
>
> The Vancouver Aquarium’s Coelacanth specimen was purchased in
> the fall of 1971. It was preserved in Formaldehyde at the time.
>
> The Coelacanth was transferred to alcohol when it was put on
> display in the Gallery. There were some alcohol changes done
> to the display in the following years. I don’t have records
> of the changes
>
> The last complete alcohol change (draining the old alcohol and
> replacing it with isopropanol) was 2000
>
> Since then, there has been no change in the isopropanol.
>
> I’ve attached pictures of the Aquarium’s Coelacanth. You can
> see the deterioration around the head, fins, and the tail.
>
> The pH reading for the display was done on April 12, 2017.
> The litmus paper indicated less than pH 5. It was pale yellow.
>
> Could you explain to me the hydrogen ion activity at pH 4?
> I’m unfamiliar with it, and it may explain the acidity.
>
> There was a density meter reading made on April 12, 2017.
> 0.9285 g/cm^2(density meter adjusted to alcohol). The display
> has 51% Isopropanol (standardize to 20^o C), and 43.4%
> (non-standardize and not corrected to temperature)
>
> You’ll see in the pictures that there are scales that have
> fallen from the specimen.
>
> Cheers,
>
> *Perry Poon*
> COORDINATOR, PROPS
>
> Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>
> D 604 659 3489
>
> ------------------------------------------------------------------------
>
> Our vision is a world in which oceans
> are healthy and flourishing. |ocean.org <https://urldefense.proofpoint.com/v2/url?u=http-3A__ocean.org_&d=DwIDaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=2vay4CLL5jRBFSezIdNGx-0PZDHlbl71Bu-MZOabJ_k&s=ksAm55R-0WEfuHr__9-2yHcca33vFTYgIMLbwWoOIFg&e= >
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>
> *From:*Simon Moore [mailto:couteaufin at btinternet.com]
> *Sent:*Thursday, September 07, 2017 3:17 PM
> *To:*John E Simmons <simmons.johne at gmail.com
> <mailto:simmons.johne at gmail.com>>
> *Cc:*Perry Poon <Perry.Poon at ocean.org
> <mailto:Perry.Poon at ocean.org>>;nhcoll-l at mailman.yale.edu
> <mailto:nhcoll-l at mailman.yale.edu>
> *Subject:*Re: [Nhcoll-l] Coelacanth deterioration
>
> Some history of the specimen’s initial treatment would be most
> helpful as John has suggested. pH 4 is the critical level for
> hydrogen ion activity, so you’re getting close and it
> obviously isn’t helping the specimen.
>
> Beware of cosmoid scale loss as well as these can be squeezed
> out over time from their protein-based ‘pockets’ on the skin
> if these pockets start to shrink. If the specimen is
> preserved in alcohol then the scale loss can be repaired using
> Necolodine solution. Feel free to come back to me if you need
> any further advice or more detail and do send pics.
>
> With all good wishes, Simon.
>
> Simon Moore MIScT, RSci, FLS, ACR
> Conservator of Natural Sciences and Cutlery Historian,
> www.natural-history-conservation.com
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.natural-2Dhistory-2Dconservation.com_&d=DwIDaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=2vay4CLL5jRBFSezIdNGx-0PZDHlbl71Bu-MZOabJ_k&s=XPdSEp9wq4zgsMdhkSyja9QzQxOpc9Ih5pQLAokoVfA&e= >
>
>
>
>
>
> On 7 Sep 2017, at 22:11, John E Simmons
> <simmons.johne at gmail.com <mailto:simmons.johne at gmail.com>>
> wrote:
>
> Do you know anything about the preservation history of the
> specimen? For example, when was it collected; was it
> frozen before being preserved; was it formaldehyde-fixed
> or preserved directly in alcohol; has it always been in
> isopropyl alcohol? Some photographs of the deterioration
> you have noticed would be very helpful.
>
> --John
>
>
> John E. Simmons
> Museologica
> 128 E. Burnside Street
> Bellefonte, Pennsylvania 16823-2010
> simmons.johne at gmail.com <mailto:simmons.johne at gmail.com>
> 303-681-5708
> www.museologica.com
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.museologica.com&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=ojZwthtm_RvMiyLAKyHGiNNou78SaQuloQ8tfqMCRR4&s=znaiaoXBwnNGn1ee56RHUyjy0SUpa9aXPKTUGddiSAw&e=>
> and
> Adjunct Curator of Collections
> Earth and Mineral Science Museum & Art Gallery
> Penn State University
> University Park, Pennsylvania
> and
> Instructor, Museum Studies
> School of Library and Information Science
> Kent State University
>
> On Thu, Sep 7, 2017 at 4:26 PM, Perry Poon
> <Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>> wrote:
>
> I am an employee of the Vancouver Aquarium in British
> Columbia. I am looking for advice in the
> deteriorating nature of the Aquarium’s Coelacanth. It
> is currently in 50% isopropanol, and the pH is less
> than 5.
>
> Deterioration is around the head, fin membranes , and
> towards the tail.
>
> Looking for expert advice, and I will send pictures to
> interested parties
>
> Cheers,
>
> *Perry Poon*
> COORDINATOR, PROPS
>
> Perry.Poon at ocean.org <mailto:Perry.Poon at ocean.org>
> Vancouver Aquarium
>
> British Columbia
>
> Canada
>
> D604 659 3489 <tel:%28604%29%20659-3489>
>
> ------------------------------------------------------------------------
>
> Our vision is a world in which oceans
> are healthy and flourishing. |ocean.org
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--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Storage
Münchhausenstr. 21
81247 München
Besuchen Sie unsere Sammlung:
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---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Storage
Muenchhausenstr. 21
81247 Munich (Germany)
Visit our section at:
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