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ECN-L  February 2012, Week 1

ECN-L February 2012, Week 1

Subject:

Re: remounting slides

From:

"Kimsey, Lynn" <[log in to unmask]>

Reply-To:

Kimsey, Lynn

Date:

Sun, 5 Feb 2012 14:34:22 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (117 lines)

Is there any way to determine what the mounting medium is on a slide, aside from wetting it?
Lynn
________________________________________
From: Entomological Collections Network Listserve [[log in to unmask]] On Behalf Of Susan Weller [[log in to unmask]]
Sent: Sunday, February 05, 2012 12:12 PM
To: [log in to unmask]
Subject: Re: remounting slides

All,

I would add to Jim's observation a reminder that we are discussing Canada Balsam - which cures much more thoroughly than Euparol. Given the price of Canada Balsam and the hazards of working with xylenes, I'm assuming many collections will follow NMNH's lead of insisting on Euparol only slide mounts.

In my experience, Euparol never cures to a point where I would be comfortable storing lep genitalia slides vertically even for short (weeks, months) periods of time. We cannot even ship newly made slides for several weeks because if the post-office or your UPS/ FedEx carrier puts the box in a warm place during shipping, all your hard work is for naught as the Euparol re-liquifies and runs all over the place.

So if you envision having Euparol slides of Lepidoptera genitalia in your collection, horizontal is the only way to go. And hand carry returns of larger specimens whenever possible...

Susan

On Fri, Feb 3, 2012 at 5:41 PM, James Woolley <[log in to unmask]<mailto:[log in to unmask]>> wrote:
> Lynn,
>
> Serguei Trjaptisyn and the Riverside group have extensive experience in remounting Hoyer's slides.  They have received at least one or two BRC awards from NSF to remount thousands of micro-Hymenoptera slides from Hoyers to Canada Balsam.
>
> I also second Barry's comments about vertical slide storage.  Canada balsam even when "dried out" is apparently like window glass, it is still actually a liquid and will allow specimens to glacially move to the bottom of the slide when stored vertically over long periods of time.  This probably occurs with most mountants.
>
> Cheers,
>
> Jim
>
>
> Jim Woolley
> Professor of Entomology
> Department of Entomology
> Texas A&M University
> College Station, TX 77843-2475
>
> 979-845-9349
> 979-845-3699 lab
> 979-845-6305 FAX
>
>
>
>
>
> On Feb 3, 2012, at 4:54 PM, Kimsey, Lynn wrote:
>
>> I wish I could say that depolymerized labels was our biggest problem. Unfortunately, the mounting medium is doing more damage, particularly in the mite and tardigrade collections.
>>
>> Have any of you developed protocols for remounting specimens in Hoyer’s or other mystery mounting mediums that are either drying out or turning opaque? We are going to have to address this issue really soon.
>>
>> Lynn
>>
>> From: Entomological Collections Network Listserve [mailto:[log in to unmask]<mailto:[log in to unmask]>] On Behalf Of Colin Favret
>> Sent: Friday, February 03, 2012 1:46 PM
>> To: [log in to unmask]<mailto:[log in to unmask]>
>> Subject: vertical versus horizontal slide storage (was: compactor-friendly slide storage)
>>
>> I concur with Barry, don't store types vertically for decades. And as I started with, there is no point to installing a new vertical storage system for an inactive slide collection.
>>
>>             However, I have found more dissociated labels in slide boxes than in vertical-storage trays. When you open a slide box, you create a suction that can pull loose labels away from their parent slide, especially since many horizontally-stored slides are actually upside-down. In a vertical storage system, the label is sandwiched between two slides, there is no vertical suction to disturb it, and it is readily identified and located when you finger through the slides (and some collections put their vertical slides in envelopes to completely remove the problem). I might add that slides and loose labels get dissociated rather dramatically every time someone opens a slide box upside down.
>>
>>             There are costs and benefits to any specimen storage system and the users' needs must be weighed against the long-term preservation of the specimen (and verse visa). We use glass-topped drawers for our pinned specimens for ease of access despite the damage that light causes (and of course the risk of broken glass), overlap butterfly wings for the sake of space despite the risk of breakage, and remove chemicals for the sake of human health despite the increased risk of dermestid infestations. I warrant the loss and damage rates of our pinned specimens are far greater than those of our vertically-stored slide-mounted specimens.
>>
>>             I conjecture that a collection's specimen storage policies will tend tend towards accessibility over preservation for those specimens preserved in the manner of the policy-makers' taxa (dry, wet, slide), and tend towards preservation over accessibility for other preservation methods. Hence, the "official" USNM policy to keep slides horizontal, but the USNM's aphid curator's policy to keep them vertical.
>>
>>             What storage methods do other slide-mounted-taxa specialists prefer? Hmm... maybe I need to create an on-line survey/poll!
>>
>> cheer, Colin
>>
>>
>>
>>
>> On Feb 3, 2012, at 15:01 , Kampmeier, Gail E wrote:
>>
>>
>> There is also the risk that labels fall off and become disassociated from their slides with vertical storage, particularly if the glue holding them to the slide proves to be non-archival.
>>
>> Cheers!
>> Gail
>>
>> Gail E. Kampmeier
>> Illinois Natural History Survey
>> Prairie Research Institute
>> University of Illinois
>> 1816 So. Oak St.
>> Champaign, IL 61820
>> www.inhs.illinois.edu/~gkamp<http://www.inhs.illinois.edu/~gkamp>
>> From: Entomological Collections Network Listserve [[log in to unmask]<mailto:[log in to unmask]>] on behalf of OConnor, Barry [[log in to unmask]<mailto:[log in to unmask]>]
>> Sent: Friday, February 03, 2012 13:53
>> To: [log in to unmask]<mailto:[log in to unmask]>
>> Subject: Re: Compacter-friendly slide storage
>>
>> Vertical storage of slides carries many risks. The mite collection of A. P. Jacot consisted of Canada balsam mounts of whole samples on each slide. He described many new species and noted the position of the types with small maps associated with each slide. After his death, the collection was stored vertically for decades. Now the specimens can all be found bunched together at the bottom of each slide. Balsam apparently does allow "drift" of specimens due to gravity if slides are stored vertically.
>> All the best! - Barry
>>
>> -So many mites, so little time!
>>
>> Barry M. OConnor                    phone: 734-763-4354
>> Curator & Professor                 fax: 734-763-4080
>> Museum of Zoology                 e-mail: [log in to unmask]<mailto:[log in to unmask]>
>> University of Michigan
>> 1109 Geddes Ave
>> Ann Arbor, MI 48109-1079
>>


--
Dr. Susan Weller
Director and Professor
J.F. Bell Museum of Natural History

Office (Mpls) 612-624-2013
Office (St.Paul) 612-625-6253
Fax (Mpls) 612-626-7704
Web: www.bellmuseum.org<http://www.bellmuseum.org>

College of Food, Agricultural, and Natural Resource Sciences

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