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I strongly agree with Luciana that everything should be bagged, in sealed bags, and allowed to return to room temperature before being removed from bags- otherwise you risk condensation on the pins, on the glass etc. this can warp your lids or rot your specimens! Sealed drawers may protect the specimens in much the same way as a bag- but the drawers themselves may still suffer as may any labels or adhesives on the outside of the drawer- if the drawer is not bagged.

Max

Sent from my iPhone

On 25 Feb 2017, at 00:44, "Brown, Richard" <[log in to unmask]<mailto:[log in to unmask]>> wrote:

Thanks to everyone for your informative postings.  We chose to put pinned specimens in cardboard or schmitt boxes into the –80 freezer, and the material that was pointed or in drawers in two regular freezers that are -15–20°F.  As some boxes have evidence of dermestid damage, we’re freezing them for two weeks.  I think this precludes the need to take them out of freezer for a few days and then refreeze them.  I thank ECN for providing this forum.

-- Richard L. Brown
Mississippi Entomological Museum
Box 9775 (100 Old Highway 12)
Mississippi State, MS 39762
PH:  662-325-2990
Cell: 662-694-0174



From: Entomological Collections Network Listserve on behalf of Jeff Stephenson
Reply-To: Jeff Stephenson
Date: Thursday, February 23, 2017 at 2:49 PM
To: "[log in to unmask]<mailto:[log in to unmask]>"
Subject: Re: freezing drawers for pest control

Hello,
It’s a matter of temperature and time.  We run our pest management freezer at -30C, bag the drawers (for thawing), and leave them in for 14 days.  No problems with drawers, glass, adhesives, or specimens have been encountered.  It’s a matter of how much time you want to commit; we do it to be as safe as possible, but run a strict schedule for placement and removal.  Lower temperatures can mean shorter duration, but I agree that ultracold temps can cause damage.

JEFF STEPHENSON
COLLECTIONS MANAGER, ZOOLOGY DEPARTMENT







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From: Entomological Collections Network Listserve [mailto:[log in to unmask]] On Behalf Of Michael A. Ivie
Sent: Thursday, February 23, 2017 1:36 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: freezing drawers for pest control


Remember you don't have to set your -80 to -80, and it will last longer at higher temps.  For pest control, -40 or even -30 will do.

Mike

On 2/23/2017 4:27 PM, Karen Wright wrote:
We are just about to inherit a klunky old -80. And we bought 3 new fancy ones. We are going to use the hand me down for pest control and the three new ones for long term storage. If you are at a large university, keep an eye on folks getting rid of their old ones. Thanks for all the advice on this! Karen

From: Entomological Collections Network Listserve [mailto:[log in to unmask]] On Behalf Of Shockley, Floyd
Sent: Thursday, February 23, 2017 9:45 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: freezing drawers for pest control

-80 is overkill for freezing drawers for pest control and CAN lead to damage.  Keep it under -50 and you should be fine (we prefer -45C).

Floyd

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National Museum of Natural History
Smithsonian Institution
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From: Entomological Collections Network Listserve [mailto:[log in to unmask]] On Behalf Of Mike Ferro
Sent: Thursday, February 23, 2017 10:38 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: freezing drawers for pest control

I had a unique experience with freezing. We ran all the drawers (about 1000) in the museum through the -80. Our oldest drawers, so far as I can tell, are from the 1930s and the newest ones are less than a year old. We had the glass crack in a handful of the older drawers, but no major problems.

However, we had a series of drawers from Bioquip made in 2012. I don't know the specifics of the drawers, but whereas normal Bioquip drawers are a "10", these are a "12"—tight, shiny, Ferraris of drawers. Anyway, within a few minutes of taking them out of the -80 to let them warm to room temperature, I began to hear a series of very sharp and alarming "cracks". I figured all the glass would be shattered and all hope was lost. Thankfully, the drawers are in perfect condition (so far as I can tell). However, the drawers had moths in them and a dozen or more specimens in each drawer lost legs or an abdomen. Presumably the vibration associated with whatever was causing the cracking noise damaged the specimens. I haven't tried refreezing the drawers to see if the phenomenon repeats itself or if the drawers are "fixed".

I don't know if it's worth it or not, but pre-freezing new drawers may be a realistic strategy to remove this threat.

Cheers,

Mike

On Wed, Feb 22, 2017 at 5:19 PM, luciana <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Ice accumulation in the freezer will damage the drawers if not bagged (had that happen here). Excess moisture may cause the lids to warp. Repeated hydration and drying process over the years may cause joints to come apart (I got this from a carpenter). By bagging I don't have to worry about it.
-- Lu
On 2/22/2017 3:38 PM, Furth, David wrote:
I started this at USNM in 1995 after some research.  I gave a couple talks at ECN a while ago about freezing.  Minus 25C will kill anything we need to worry about.  No need to bag or repeat freeze - cellulose will reabsorb any moisture. But after freezing do leave drawers, etc. out for enough time for them to re-acclimate - don't open them.
We also talk about this in the Entomology Collections Management Workshop.
________________________________
From: Entomological Collections Network Listserve [[log in to unmask]<mailto:[log in to unmask]>] on behalf of Brown, Richard [[log in to unmask]<mailto:[log in to unmask]>]
Sent: Tuesday, February 21, 2017 11:01 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: freezing drawers for pest control
We are receiving some major donations, some of which have had some dermestid damage.  We have regular freezers as well as an ultra-low freezer.  Does anybody know of adverse effects of putting drawers of specimens in an ultra-low freezer before the drawer is brought into museum?



-- Richard L. Brown
Mississippi Entomological Museum
Dept. Biochemistry, Molecular Biology,
      Entomology & Plant Pathology
Box 9775 (100 Old Highway 12)
Mississippi State, MS 39762
PH:  662-325-2990<tel:%28662%29%20325-2990>
Cell: 662-694-0174<tel:%28662%29%20694-0174>



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